Poetry and Mother Essay Example for Free

Poetry and Mother EssayOutlineIt is an afternoon and the mom is washing clothes in a tub. The child has scripted a rime for her mother and gives it to her as she is washing. The mother scans the poem but rejects it as not being all there is to life. She feels that there is lots more to life than information or writing numbers. Despite her protest, the mother glances at the poem while she continues to wash clothes.Stanza 1The mother obviously has disposed her life to hard work and struggle and seems to have lost interest in life. She does not seem to respect the effort of her child to extend many relief or change in her shootsome routine. That her mother washes in the afternoon indicates that her workload is enormous (as washing is usually done in the dayspring so the clothes can be hung out to dry.)The images of stress and strain are effectively captured in the description of the women hunched over the washtub and her shrivelled reach. The word hunched suggests her str enuous routine which has physically harmed her posture. The comparison of her hands to the shrivelled burnt skin of granadilla evokes the destructive efforts of hard labour on her physical body.Stanza 2The speech of the childs poem are compared to a piece of slippery soap. Just as soap is used to mend dirt off clothes in this case, so too do the words of the poem give the mother strength and the power to bear her burden to restore her to some state of wholesomeness, just like soap restores clothes to their original clean condition. Note that the mother grabbed the words and used them, suggesting that she needed them urgently to sustain her to cope with the oppressive burden of life.Stanza 3It is the burden of life which weighs down oppressively, that prevents the mother from appreciating or being sensitive to other aspects of life (like reading and enjoying poetry) But the fact that she does read the poem indicates that she is aware of its significance and healing power. (A poem a ppeals to our aesthetic sense.) It makes us see life in detail and appreciate the multi-faceted experiences of life. The word scanning suggests that she does read the poem.The reference to the mothers blue-ringed gaze suggests that she has a deeper, appreciative side to her temperament. Note that the colour blue is usually associated with deliver and beauty. The reference to the dirty water is a metaphor for the pollution and corruption of life which have sullied or dirtied capacity to be sensitive to the beauty of nature of life.Stanza 4The poem ends on a positive note. The mother continues to hold onto the words of the poem, the word clenched recalls the term grabbed of stanza 2, it means to hold tightly onto something. That the words are clenched smaller and smaller indicates the great effort exerted by the mother to make the world of poetry a part of her life, she realises the value of poetry to guide her through the difficulties of life.Central message of the poemThe poem whi lst acknowledging the burden and harshness of life, confirms the value of developing our aesthetic nature, our capacity to appreciate what life has to offer as the only hope to cope with the hostility and problems we encounter on a daily basis.Further ConsiderationThe writer uses simple words to beef up the innocent, pure exchange between mother and child. The simplicity of the words also evokes the humility of their life the setting is most likely a rural one.The poem also has a simple structure the lines are uniform and short reinforcing the simple effort of the child to console her mother.

Revolutionizing a Better Era of Technology in the Future of Medicine Essay Example for Free

Revolutionizing a Better Era of Technology in the Future of Medicine EssayAlan Kay states, The best way to anticipate the future tense is to invent it yourself (qtd. in Garreau 88). Many Americans ponder what the future office hold. Will engine room bring a brisk era to mankind or volition it be the end to all eternity? Ray Kurzweil, inventor of the year by MIT, argues he is convinced that medicine is moving sufficiently nimble therefore, any person who can stay healthy for the next 20 years may so gain ground from the explosion in biological applied science as to be immortal (Garreau 90-91). With the advancements of medical technology continuing to climb, this quote illustrates that the future volition make for a better human beings. Organizations such as The defensive measure Advanced Research Projects Agency known as DARPA, The Continuous Assisted Performance known as CAP, and The National learning Foundation fund studies that install how agenttic engineering will impact Americas future by developing a bigger, better, stronger individual (Garreau 19-35). Each day as the advancements of technology doubles, the world will before long not worry about diseases and health everyday gene technology will better our minds, bodies, and most future generations, thusly making the enlightenment Scenario. In the Article agent Technology and Tissue engineer Andree, department of Plastic and Surgery, Freiburg Univer teasey Hospital, states Gene therapy is based on the concept for definite proteins or polypeptides into a cell and, thus, may be used for potential modulation of tissue. Genes can be delivered using either an in vitro approach, and with viral or non-viral vectors. Genes may therefore be stable, or transiently expressed by the cells (93).This fact illustrates the concept of contractable manipulation and how each cell is expressed. Both abstract DeSalle, Ph.D. in Division of Invertebrates, and Michael Yudell, MPH in Molecular Laboratori es, summarize that the study of Genomics will have a major impact in medical services. If doctors knew how to queer someones exact diseases, then they can transform and improve those cells to stop in in its act (117-118). With the help from DARPA and CAP and the study and treatmentsof Gene therapy, Americans will soon find themselves living longer and healthier lives. DARPA funded by Michael Goldbatt, is one of the worlds foremost drivers of human enhancement (Garreau 19). Their vision is to drive the future into being (Garreau 21). DARPA help fund the computer mouse, graphics, weather satellites, and many other technologies (Garreau 25). One independent agency that works strongly with DARPA is CAP managed by John Carney (Garreau 28). CAPs advantage over DARPA is the laboratory. One idea that they are studying is finding an enzyme that appears only in bacteria but not in us. It might exist only for a brief time in the bacteria, but without it, that life form cannot exist. Then you attack it (Garreau 28-30). Organizations such as DARPA and CAP extend to to make unstoppable human beings. For instance, take the well-developed movie Gattaca which came to theaters in 2010 and was about a man that manipulates his DNA to hide his identity to be a more advanced, communicableally engineered, human being. No one is capable of stopping him from becoming a better meaningful species to society.Most Americans strive to build themselves up to plow the best they can be. Americans study the use of DNA manipulation in bodies and cells to help fight off diseases and illnesses such as the common cold or flu. Goldblatt proclaims, We do not fear the unknown, and we relish exploring the unknowable (Garreau 19). Americans should be more like this quote and strive to become the best species that has ever existed. DARPA is studying a vaccine that will help in pain management. Such vaccines will make milestones in terms of medicine. If someone is hurt they will feel the initial trigger of pain but the pain will soon subside (Garreau 19-28). This pain vaccine will have many benefits to Americans dealing with diseases and to society. The National Science Foundation believed in the Heaven Scenario They predicted in 10-20 years the world will evolve much better. Wearable sensors will enhance every persons awareness of his or her health condition, environment, chemical pollutants, potential hazards, and information of interest about local business, natural resources, and the like. The human dead body will be more durable, healthy, energetic, easier to repair, and resistant to many kinds of stress, biological threats, and aging process, and technologies will compensated for many physical and mental disabilities and will eradicate altogether some handicaps that have plagues the lives of millions of people. (qtd. in Garreau 112-113) This statementunveiled a world where technology advancements will mature in a way that Americans are capable of being healthier and h appier individuals. The set up of genetic engineering impacts the future by manipulating genes to help Americans live longer. Enzo Russo and David Cove, authors of Genetic Engineering Dreams and Nightmares, tell a brief story about a elflike girl that was suffering from a disease called Severe Combined Immune Deficiency.She was the first known human being to be treated using gene therapyAfter two years of therapy, this young girl was able to attend school normally, to swim, dance, ice skate with her family and friends (117-118). With this example it substantially shows the achievements of Gene Therapy and how Americans greatly benefit from them. Children will have the privilege to go out and play or do whatever else their little imagination wants to do so they can be just like every other child. If doctors had a way to catch or see a disease before it overtakes someones body then they would be able to do something about it. Jacobs, consultant genetic counsellor Guys and St. Thomas NHS Foundation Trust, believes Early identification of individuals with, or at risk of, hereditary disease can make a difference to patients and families in terms of accessing genetic services, early detection and risk-reducing measures. Several clinical guidelines recommend undertaking family history assessment in clinical setting (Jacobs, Chris, Christine 38). Jacobs also states that Recognizing when off spring may be at risk of genetic condition such as cystic fibrosis, Duschenne muscular dystrophy or Huntingtons disease, can help couples to make choices about prenatal testing and pre-implantation genetic diagnosis. These procedures increase the possibility of a healthy baby and reduce the risk of passing the mutation to future generations (Jacobs, Chris, Christine 38). With this possibility, think of how it will make a new era to mankind. Parents no longer have to worry about unborn babies and whether they will have the same disease as their ancestors.Another person that was in fluenced by Gene Therapy is Gregory Stock. Stock, director on Medicine, Technology, and society at the school of medicine of California, proclaims In the future Americans will benefit from using Artificial Chromosomes. Future generations will be able to switch out one or two chromosomes that may be transferring diseases with a stronger chromosome (qtd. in Garreau 116-117). There are many believers of the Heaven Scenario although all the outcomesmight not be the same. Ray Kurzweil, who was granted the national medal of technology, was the inventor of the Heaven Scenario. He utter is there is no riddle or challenge that there is not an idea to overcome that problem (qtd. in Garreau 115). This statement argues that no matter how difficult something might proclaim to be, there will always be a new improved way to get thru. In terms of medicine, there will always be new inventions of technology and drugs that will make a better advancement then the former. No matter what the statistics say technology will always have an astonishing outcome. If Americans had the hazard to formulate themselves at a higher level of humanity then why not go for it? (Garreau 115)Most Americans dream that one day the world will be a heavenly place for all humanity. With the advancements of new medical technology doubling and continuing to climb up this progressive ladder, Americans soon will be bigger, stronger, and healthier individuals. The inventions of new drugs, either injected or manipulated into genes, will influence making the outcome of the Heaven Scenario true. If more organizations like previously stated DARPA and CAP continue to find new ways of implementing and then attacking infections and disease Americans will live much longer non-stressful lives. Imagine the outcome of light up clear headed and pain free with no worries in sight. Future generations will have the knowledge and ability to know when a bad enzyme associate on and attacks cells furthermore, being able to stop the infection before it explodes and travels thru DNA. It will be a new era to mankind. Americans will be able to teach and choose how their children turn out. Children will be healthier and live longer lambent lives. Like my opening quote the best way to predict the future is to invent it yourself. Negative controversies about technology being the end of mankind should not influence Americans into not believing in the Heaven Scenario, thus sit back and watch the never ending achievements and outcomes of Gene therapy transmute the world into a better brighter norm.Works CitedAndree, C., et al. Gene Technology and Tissue Engineering. Minimally Therapy ally Technologies 11.3 (2002) 93-99. Academic Search Premier. Web. 18 March 2014. DeSalle and Michael Yudell. Welcome To The Genome A Users Guide to Genetic Past, Present, and Future. Canada John Wiley Sons. Inc., 2005. Print. Garreau, Joel. Radical Evolution The Promise and jeopardy of Enhancing Our Minds, Our Bodies- and Wha t It Means to Be Human. New York Random House, 2005. Print. Jacobs, Chris, and Christine Patch. Identifying Individuals Who Might Benefit From Genetic Services And Information. Nursing Standard. 28.9 (2013) 37-42. Academic Search Premier. Web. 18 March 2014. Russo and David Cove. Genetic Engineering Dreams and Nightmares. Oxford New York Tokyo Oxford University Press, 1998. Print.

Milling machines: An introduction

mill about appliances An introductionChapter I 1.1 IntroductionThe ability of any nation to become is essential precisely to deploy that ability in a certain nation is the trick as every nation defers from superstar a nonher, so in order to enhance Arab nation ability to manufacture we will provide a better cheaper design for a CNC mill about machine.The Primary Objective of This cast off is to present and develop a prototype for a substitution of the expensive hard to acquire machining facility for the Middle East industrial conjunction these machining facilities take the regular Turning, Drilling, Shaping, mill, and Grinding shapes. Our primary pile concluded that in that location always must be a turning machine beside a mill about machine, but a mill about machine (CNC mill machine) quite a little include the rest of processes required within its feat to a good degree and the turning motion to an accep dishearten degree. So we chose the mill about machine as ou r initial model to undergo our optimization plan. Therefore our Primary objective of choice is to Design a Basic Three Axis CNC choke machine. Also to manufacture a determineing Prototype for this machine fabricated all with nationally available components in order to minimize its cost but maintains an accep parry level of accuracy to suite a Computer Numerical Control form. A nonher Thing that we must point out is that in order to accomplish this project we need more than one trial to find the suitable combination of components and specs to give chase in order that this machine comes to light. 1.2 Proposed ApproachA new approach is necessary that approach is based upon the 2010-2015 World Outlook for Computer Numerical Controls 1. The results of that survey were mainly based upon word wide research includes Middle East and North Africa. These results showed that any machine diaphysis required for the Egyptian industrial society could be one of the following Turning, Drillin g, Shaping, Milling, and Grinding. So the first step was to pick up the operation over which this thesis will focus on. Milling washbowl include in its operation Drilling, Shaping, and Grinding. And might contain Turning under certain conditions. So milling was chosen. And this result might be verified by the fact that 90% of the working machine dents in the field of traditional CNC machines argon either Milling or Turning Centers.Now we will liken antithetic configuration of milling machinesCase 1 A Universal Milling sincere machine.Case 2 A regular CNC Milling Machine.Case 3 Gantry style CNC Milling Machine.Case 1 A Universal Milling Machine From Cost point of view Cost is spicy because of the rule of large signifi seatt to build the bulky startles of the machine peckerwood might be as heights as a CNC Milling MachineFrom Design point of view Design level might be considered low compargond with the design required in some(prenominal) the regular CNC machine and our ma chine.From true statement fate of view Accuracy is very low comp argond to the other cardinal baptistrys but could be difficulty approached with the use of very skilled labor and with high cost.Case 2 A regular CNC machineFrom Cost Point of view Cost is much higher because of the usage of both large material amounts with high machining grade as will as the cost of the motion control equipments.From Design Point of view Design is better than the first case for every part is designed to enhance the entire machining operation.From Accuracy Point of view Attained accuracy is very high due to perfect hire ways assisted by ball screws along with feed back control.Case 3 A gantry CNC milling machineFrom Cost Point of view Cost is mush less than the later case and might be less that the first case as the entire machine is simply build from a metal sheet and some Bars.From Design Point of view Design is much sophisticated than the first and the second case as the design is optimized t o hold the predetermined forces as a light weight structure.From Accuracy Point of view Accuracy is for sure less than the second case but higher than the first case as there is no feedback control technique employed. Discussion of resultsFor case 1 Universal Milling Machine Our results dont imply that the use of that machine is not appropriate but we however mean that severally application requires a certain machine and likewise distributively goal. The cost is very high in EGYPT as almost all of them is imported but not made in EGYPT but there alimentation and overhauling is available domestically.For Case 2 three axis CNC milling machine Vertical Column type. The usage of this type of machines in any workshop requires a great deal of money so most of the manufacturers comprises amid money and accuracy. The cost is definitely much higher as there is almost no one building or even providing maintenance for these machines in EGYPT.For Case 3 Gantry style CNC milling machine. The usage of this machine is aimed to workshops who would like to necessitate both cheap machining with good accuracy. The cost is very low as of the innovative design of putting the entire axis moving over individually other rather than indep give the sackent from each other as in the regular design of any CNC machine Chapter IILiterature Review2.1 Milling Machine Milling is the process of machining flat, curved, or irregular sur establishments by feeding the work region against a rotating tender containing a cast of cutting edges. The milling machine consists basically of a ride driven spindle, which mounts and revolves the milling cutter, and a reciprocating adjustable worktable, which mounts and feeds the work piece.2.1.2 Milling Machine HistoryUnlike lathes, which have been know for thousands of years, milling machines be less than two hundred years old. Because they require much more power than hand-driven lathes, their introduction had to wait for the invention of indu strial pee and steam power. Also, all their mechanical components had to first be made available, such as accurately fitted slides, large castings to resist cutting forces, calibrated lead screws, and set(p) steel cutting tools.Eli Whitney is credited with inventing the first milling machine about 1818, but the knee-and-column support arrangement of the normal milling machine of Joseph A. browned (later of Brown and Sharpe) dates from 1862 and marks an important step in the machines development. During the last half of the nineteenth Century, milling machines gradually replaced shapers and planers which have lathe-type, single-point tool bits that head for the hills over the work in a corking line and scrape off metal one stroke at a time. Milling machines, with their continuous cutting action, not entirely channel metal faster than shapers and planers, they perform additional operations like cutting helices for gears and twist drills. Today, milling machines greatly outnumb er shaping and planning machines. Ameri dopes in New England and later the Midwest continuously added features leading to the modern milling machine.Another important development came in the 1930s when Rudolph Bannow and Magnus Wahlstrom brought out the Bridgeport-style unsloped milling machine. This design offers versatility and economy in place of the higher metal removal rates of traditional crosswise milling machines. Because of this versatility, there are more Bridgeport-style move in existence today than any other milling machine design. Horizontal mills are now usually reserved for production applications where high metal removal rates on identical parts are needed, not prototyping and short happens. Bridgeport-style machines are as well called knee-and-column machines and turret mills.For production applications, there are large, expensive milling machines with three or more axes under computer control. Some machines perform all operations including automatic tool chang ing. However, today there is an intermediate step between a manual mill and a fully automated one. Adding a computer, digital readouts, and actuators to the X- and Y-axes of a Bridgeport-style mill does this. Not only chiffonier this enhanced machine tirelessly perform all its existing repetitive functions, it also has added new capabilities.Now the mill pot engrave (drive the tool to cut numbers and letters in various sizes and fonts), cut radii and angles without a rotary table, make islands, pockets, and cut ellipses, and frames. Entering the position, diameter and number of holes, automates cutting a bolt-hole pattern the ashes does the math. The computer can automatically compensate for the reduced diameter of re sharp end milling cutters, saving time and money. The dodge can be manually programmed through its control panel, use stored programs, learn new tasks by memorizing a series of manual operations as the promoter makes the first part, or accept files from CAD progra ms. 2.1.1 Type of MILLING MACHINESMilling machine are classified on the base of the position of their spindle. The spindle operates in either a vertical or horizontal position or on base of construction. In a following section we represent the different type of milling machine.Column Knee-type Milling Machine Fig 2 machines are characterized by a vertically adjustable worktable resting on a saddle which is supported by a knee. The knee is a massive casting that rides vertically on the milling machine column and can be clamped rigidly to have column in a position where the milling head and milling machine spindle are properly adjusted for operation. The filmy vertical column knee type machines are characterized by a spindle located vertically, parallel to the column face, and mounted in a skid head that can be fed up and reduce by hand or power. Modern vertical milling machines are designed so the entire head can also swivel to permit working on angular surfaces. The plain horizont al milling machines column contains the drive motor and gearing and a fixed position horizontal milling machine spindle. An adjustable overhead arm containing one or more spike supports projects forward from the top of the column. The arm and arbor supports are used to stabilize long arbors. Supports can be moved along the overhead arm to support the arbor where support is desired depending on the position of the milling cutter or cutters. UNIVERSAL MILLING MACHINE The basic battle between a universal milling machine and a plain column knee type milling machine is the addition of table swivel housing between the table and the saddle of the universal machine. This permits the table to swing up to 45 in either direction for angular and helical milling operations. The universal machine can be fitted with various attachments such as the indexing fixture, rotary table, slotting and rack cutting attachments, and various special fixtures.RAM-TYPE MILLING MACHINEThe ram-type milling mach ine is characterized by a spindle mounted to a movable housing on the column to permit positioning the milling cutter forward or rearward in a horizontal plane. Two popular ram-type milling machines are the universal milling machine and the swivel cutter head ram-type milling machine.Gantry Milling Machinefigure 5is simplest construction of milling machine is usually use in CNC machine for cutting wood plastic and light metal Rotary-Table Milling MachinesThese are also called continuous milling machines, as the work picas are set up without stopping the operation. Rotary-table machines are highly productive consequently, they are frequently used for both batch and mass production. The Work prices being machined are clamped in fixtures installed on the rotating table (2) figure 6. The machines may be equipped with one or two spindle heads (1).When several surfaces are to be machined the Work pieces are indexed in the fixtures after each complete revolution of the table. The machining cycle provides as many table revolutions as the number of surfaces to be machined. 2.1.2 MILLING CUTTERSThe milling cutters are selected for each specified machining duty. The milling cutter may be provided with a hole to be mounted on the arbor of the horizontal milling machines, or provided with a straight or immortalizered shank for mounting on the vertical or horizontal milling machine. Figure 7 visualizes commonly used milling cutters during their operation. These include the following speak up milling cutters are either straight or helical ones. Helical milling cutters are preferred for large cutting widths to provide smooth cutting and improved surface quality (Figure 7 a). Plain milling cutters are mainly used on horizontal milling machines. Face milling cutters are used for the production of horizontal (Figure 7 b), vertical (Figure 7 c), or inclined (Figure 7 d) at surfaces. They are used on vertical milling machines, planer type milling machines, and vertical milling machines with the spindle swiveled to the required angle. Side milling cutters are clamped on the arbor of the horizontal milling machine and are used for machining of the vertical surface of a shoulder (Figure 7 e) or cutting a keyway (Figure 7 f). Interlocking (staggered) side mills (Figure 7 g) mounted on the arbor of the horizontal milling machines are intended to cut wide keyways and cavities. Slitting saws (Figure 7 h) are used on horizontal milling machines. Angle milling cutters, used on horizontal milling machines, for the production of longitudinal grooves (Figure 7 I) or for edge chamfering. End mills are tools of a shank type, which can be mounted on vertical milling machines (or directly in the spindle nose of horizontal milling machines). End mills may be employed in machining keyways (Figure 7 j) or vertical surfaces (Figure 7 k). Key-cutters are also of the shank type that can be used on vertical milling machines. They may be used for single-pass milling or multi pas s milling operations (Figures 7 l and 7 m). variety-milling cutters are mounted on horizontal milling machines. Form cutters may be either concave as shown in (Figure 7 n) or convex as in Figure (7 o). T-slot cutters are used for milling T-slots and are available in different sizes. The T-slot is machined on a vertical milling machine in two steps 1-Slotting with end mill (Figure 7 j) 2-Cutting with T-slot cutter (Figure 7 p). Compound milling cutters are mainly used to produce compound surfaces. These cutters realize high productivity and accuracy (Figure 7 q).Inserted tool milling cutters have a main body that is fabricated from tough and less expensive steel. The teething are made of alloy tool steel, HSS, carbides, ceramics, or cubic boron nitride (CBN) and mechanically attached to the body using set screws and in some cases are brazed. stonecutters of this type are confined usually to large-diameter face milling cutters or horizontal milling cutters (Figure 7 q). Gear milling cutters are used for the production of spur and helical gears on vertical or horizontal milling machines (Figures 7 r and 7 s). Gear cutters are form-relieved cutters, which are used to mill contoured surfaces. They are sharpened at the tooth face. Hobbing machines and gear shapers are used to cut gears for mass production and high-accuracy demands. 2.1.3 Milling operationMilling is the removal of metal by feeding the work past a rotating multi sabertoothed cutter. In this operation the material removal rate (MRR) is enhanced as the cutter rotates at a high cutting speed. The surface quality is also improved due to the multi cutting edges of the milling cutter. The action of the milling cutter is totally different from that of a drill or a turning tool. In turning and drilling, the tools are kept continuously in contact with the material to be cut, whereas milling is an intermittent process, as each tooth produces a chip of versatile thickness. Milling operations may be classifie d as peripheral (plain) milling or face (end) milling (Figure 8).In peripheral milling, the cutting occurs by the teeth arranged on the periphery of the milling cutter, and the generated surface is a plane parallel to the cutter axis. Peripheral milling is usually performed on a horizontal milling machine. For this reason, it is sometimes called horizontal milling. The appearance of the surface and also the type of chip data formattingion are affected by the direction of cutter rotation with respect to the movement of the WP. In this regard, two types of peripheral milling are differentiable, namely, up-milling and down-milling.Up-milling is accomplished by rotating the cutter against the direction of the feed of the WP (Figure 9 a). The tooth picks up from the material gradually that is, the chip starts with no thickness and increases in size as the teeth progress through the cut. This means that the cycle of operation to remove the chip is first a sliding action at the beginning a nd then a crushing action takes place, which is followed by the actual cutting action. In some metals, up-milling leads to strain hardening of the machined surface, and also to chattering and excessive teeth blunting. Advantages of up-milling include the following It does not require a backlash eliminator. It is safer in operation (the cutter does not climb on the work). Loads on teeth are acting gradually.Built-up edge (BUE) fragments are absent from the machined surface. The milling cutter is not affected by the sandy or scaly surfaces of the work. Down-Milling is accomplished by rotating the cutter in the direction of the work feed, as shown in Figure 9b. In climb milling, as implied by the name, the milling cutter attempts to climb the WP. Chips are cut to maximum thickness at initial engagement of cutter teeth with the work, and decrease to zero at the end of its engagement.The cutting forces in down milling are directed downward. Down-milling should not be attempted if machine s do not have enough rigidity and are not provided with backlash eliminators. Under such circumstances, the cutter climbs up on the WP and the arbor and spindle may be damaged.Advantages of down-milling include the following Fixtures are simpler and less costly, as cutting forces are acting downward.Flat WPs or plates that cannot be held can be machined by down-milling. Cutter with higher rake angles can be used, which decreases the power requirements.Tool blunting is less likely. Down-milling is characterized by fewer tendencies of chattering and vibration, which leads to improved surface finish. up millingdown milling In face milling, the generated surface is at a right angle to the cutter axis. When using cutters of large diameters, it is a good practice to swag the spindle head slightly at an angle of 13 to provide some clearance, which leads to an improved surface finish and eliminate tool blunting. Face milling is usually performed on vertical milling machines for this reason , the process is called vertical milling, which is more productive than plain milling.2.2 Computer Numerical ControlThe abbreviation CNC stands for computer numeral control, and refers specifically to a computer controller that reads G-code instructions and drives a machine tool, a powered mechanical device typically used to fabricate components by the selective removal of material. CNC does numerically directed interpolation of a cutting tool in the work envelope of a machine. The operating parameters of the CNC can be altered via a software load program.2.2.1 Historical overviewCNC was preceded by NC (Numerically Controlled) machines, which were hard wired and their operating parameters could not be changed. NC was certain in the late forties and early 1950s by John T. Parsons in collaboration with the MIT Servomechanisms Laboratory. The first CNC systems used NC style hardware, and the computer was used for the tool compensation calculations and sometimes for editing.Punched t ape continued to be used as a medium for transferring G-codes into the controller for many decades after 1950, until it was eventually superseded by RS232 cables, floppy disks, and now is commonly buttoned directly into plant networks. The files containing the G-codes to be interpreted by the controller are usually saved under the .NC extension. Most shops have their own saving format that matches their ISO certification requirements.The introduction of CNC machines radically changed the manufacturing industry. Curves are as easy to cut as straight lines, complex 3-D structures are relatively easy to produce, and the number of machining steps that required human action has been dramatically reduced.With the increased automation of manufacturing processes with CNC machining, considerable improvements in consistency and quality have been achieved with no strain on the operator. CNC automation reduced the frequency of errors and provided CNC operators with time to perform additional t asks. CNC automation also allows for more flexibility in the way parts are held in the manufacturing process and the time required changing the machine to produce different components.2.2.2 Production environmentA series of CNC machines may be combined into one station, commonly called a cell, to progressively machine a part requiring several operations. CNC machines today are controlled directly from files created by CAM software packages, so that a part or assembly can go directly from design to manufacturing without the need of producing a drafted paper drawing of the manufactured component. In a sense, the CNC machines represent a special segment of industrial robot systems, as they are programmable to perform many kinds of machining operations (within their designed physical limits, like other robotic systems). CNC machines can run over night and over weekends without operator intervention. Error detection features have been developed, giving CNC machines the ability to call th e operators mobile phone if it detects that a tool has broken. period the machine is awaiting replacement on the tool, it would run other parts it is already loaded with up to that tool and wait for the operator. The ever changing intelligence of CNC controllers has dramatically increased job shop cell production. Some machines might even make 1000 parts on a weekend with no operator, checking each part with lasers and sensors.2.2.3 CNC Components and Control SystemThe two main components of a CNC machine are the machine tool and the machine control unit (MCU). The MCU is the computer that operates the machine tool. There are many manufacturers of these control units, so program codes may vary somewhat between machines.Figure 10 shows three types of control systems for NC and CNC machines. The least expensive type is called a point-to-point (PTP) control system. A PTP control system can only move a tool in a straight line and is limited to hole operations (drilling, boring, reaming , etc.) and spot welding. The tool path between points is not controllable in a PTP system. A straight-cut control system is capable of moving the cutting tools in a straight line between points. However, only one axis drive motor can move at one time, so arcs and angles are not possible. The contouring control system is the most expensive and flexible of the three systems. With the recent advances in electronics, the price difference between these systems has narrowed so much that every CNC machine is now manufactured with a contouring control system. A contouring system is capable of doing what the other systems can do while also being able to cut arcs and angles. 2.2.3 Positioning FormatsA CNC program is written using the Cartesian coordinate system. The CNC tool can be moved inside the rectangular coordinates in either two or three dimensions. Lathes are programmed two-dimensionally using only the x- and y-axes, while milling machines are programmed three-dimensionally using the x-, y-, and z-axes.The z-axis is always the axis that determines the depth of cut. The x-axis is parallel to the longest length of the machine table, and the y-axis is parallel to the shortest length of the machine table. CNC programs can be written in one quadrant or four quadrants.CNC machines can be positioned in two ways with respect to the Cartesian coordinate system. They can be positioned in an right-down format or an incremental format. In the absolute format, all machine locations are taken from starting point (0, 0), which is referred to as the home position. In incremental format there are no assigned or home coordinates. The cutter tool bit moves in spaces (increments) relative to the coordinates previously listed.The absolute format is typically used for the main body of a CNC program. This allows the cutting tool to be given a home position to start and end its job. The incremental format is used in the middle of a program when a repetitious cycle (commonly referred to as a keep cycle) is needed. A canned cycle is a cutting pattern that can be programmed to repeat as many times as desired. It can reduce the size of a program tremendously, depending on the number of machining operations involved. The size of a program is reduced by a canned cycle because a programmer does not have to give the fixed coordinates of each move of the cutting tool. A programmer must only give the distance from each previous move of the cutter for one cycle. After that, a programmer merely has to list the number of times the cycle must be repeated. A programmer can also call up the canned cycle and use it again to do a similar machining operation in another part of the work piece.2.2.4 CNC ProgrammingBecause of the added feature of a computers memory, CNC programming is a lot easier and simpler than conventional NC programming. Most CNC machines can be programmed using a standardized list of codes that were developed by the Electronics Industries Association (EIA), a s shown in Table 1. These codes include preparatory functions or G codes. Some of these functions include cutting an arc in a clockwise direction (G02 circular interpolation) and telling the machine that the dimensions will be given in millimeters (G71-metric programming). 2.2.5 Task Flow in CNCThe task flow that is needed for producing unconnected using a CNC machine can be summarizedas Fig.1.2.The tasks can be classified as the following three types Offline tasks CAD, CAPP, CAM. Online tasks CNC machining, monitoring and On Machine bar. Post-line tasks Computer Aided Inspection (CAI), post-operation.Offline tasks are the tasks that are needed to generate apart program for controlling a CNC machine. In the offline stage, after the shape of apart has been decided, a geometry model of this part is created by 2D or 3D CAD. In general, CAD means Computer Aided Design After coat geometric modeling, Computer Aided Process Planning, CAPP, is carried out where necessary information for machining is generated. In this stage, the Selection of machine tools, tools, jig and fixture, decisions about cutting conditions, Scheduling and machining sequences are created. Because process planning is very Complicated and CAPP is immature with respect to technology, process planning generally depends on the know how of a process planner.CAM (Computer Aided Manufacturing) is punish in the final stage for generating apart program. In this stage, tool paths are generated based on geometry information from CAD and machining information from CAPP. During tool path generation, interferences between tool and work piece, minimization of machining time and tool change, and machine performance are considered .In particular CAM is an essential tool to generate 2.5D or 3D tool paths for machine tools with more than three axes.Online tasks are those that are needed to machine parts using CNC machines. A part program, being the machine understandable instructions, can be generated in the a bove mentioned offline stage and part programs for a simple part can be directly edited in CNC by the user. In this stage, the CNC system reads and interprets part programs from memory and controls the movement of axes. The CNC system generates instructions for position and velocity control based on the part program and servo motors are controlled based on the instructions generated. As the rotation of a servo motor is transformed into linear movement via ball screw mechanisms, the work piece or tool is moved and finally, the part is machined by these movements.In the online stage, the status of the machine and machining process may be monitored during machining. Actually, tool breakage detection, compensation of thermal deformation, adaptive control, and compensation of tool defection based on monitoring of cutting force, heat, and electric current are applied during machining. On Machine Measurement is also used to calculate machining error by inspecting the finished part on the machine, returning machining errors to controller to carryout compensation.The post-line task is to carryout CAI (Computer Aided Inspection), inspecting the finished part. In this stage, revue using a CMM (Coordinate Measurement Machine) is used to make a comparison between the result and the geometry model in order to perform compensation. The compensation is execute by modifying tool Compensation or by doing post operations such as re machining and grinding. Reverse engineering, meaning that the shape of the part is mensural and a geometric model based on the measured data is generated, is included in this stage. As mentioned above, through three stages, it is possible for machine tools not only to satisfy high accuracy and productivity but also to machine parts with complex shape as well as simple shapes. Because CNC machines can machine a variety of parts by changing the part program and repetitively machine the same part shape by storing part programs, CNC machines can be use d for general purposes.

The Rights For Freedom Of Aboriginal Australians History Essay

The Rights For liberty Of primal Australians History EssayThis essay focuses on the rights for freedom for the old Australians who have lived in Australia for at least 40,000 years. The arrival of the Europeans in 1788 resulted in the real change to traditional key customs and way of life. Up until 1901 colonial governments and communities formally and informally discriminated against Aboriginal battalion (Rights and freedoms, 1945- the present, n.d.).Three epochal events that focus on this are the Day of Mourning, 1938, The Freedom Ride, 1965, and the Aboriginal Tent Embassy, 1972. The depression of these events took place in 1938, which was the Day of Mourning. On this day of the 150th day of remembrance of the dependency of Australia by the British, an organised Aboriginal rights movement had been established. On this day the British celebrated. The Aboriginal gathering did not celebrate merely organised a conference and protest in the Australian Hall, Sydney and planne d a march from the Town Hall (Rights and freedoms, 1945- the present, n.d.).The second event was the 1965 Freedom Ride, which baffling a group of students from the University of Sydney who began a journey by bus to several rural townsfolks in New South Wales. The purpose of this was to gather information, publicize the conditions and discrimination of the Aboriginal concourse living in these towns. This was lead by Charles Perkins (Rights and freedoms, 2011).The third event was the establishing in Canberra, 1972, of the Tent Embassy, to protest against a court decision over mining trading operations on Aboriginal pop. Angered by the announcement, Aboriginal groups stubborn on Australia Day, 1972, that four representatives from Sydney would travel to Canberra to protest the decision (Korff, J., 2012).The Day of Mourning events began when William make in 1933, who founded the Australian Aborigines League in Melbourne in 1932, organised a pray to be sended to King George V. H e also sent a petition to the Australian government in a request that they take control of Aboriginal affairs. However, the requests of the Aboriginal community were ignored. This prompted Cooper to take on a diverse approach, one which would ensure that it could not be ignored. On 13 November 1937, he called for 26th January, 1938 to be commemorated as a Day of Mourning. The purpose was to make the non- autochthonous population more aware of how the Australian Aboriginals had been discriminated against byout history and to encourage them to meet their requests for equal citizenship (The Day of Mourning, Background, 2012).While the government acknowledged receipt of the petition, they gave no indication that it would be forwarded to the King. So on November 12, 1937, Cooper called a concourse in Melbourne, at which Jack Patten, the President of the Aborigines Progressive Association and William Ferguson, also a member, described life in the Aboriginal communities. Doug Nicholls, the most senior Aboriginal leader in Australia, also spoke. The following day quotes from their speeches appeared in the Argus, a Melbourne newspaper. At that meeting Cooper called for a Day of Mourning and a protest in Sydney to be held on the following 26th of January. Plans for the observance of Aboriginals throughout Australia for a Day of Mourning simultaneously with the 150th anniversary celebrations in Sydney, were announced by the Australian Aborigines League (The Day of Mourning, Background, 2012).The Australian Aboriginal groups refused to participate in the re-enactment of the First Fleets landing at Farm Cove in Sydney, which was the focus of the British pack celebrations. Little attention was paid to Aboriginal and Torres phone Islander peoples during the celebrations. each colonies except South Australia proclaimed Anniversary Day a public holiday and celebrated Australias 100th birthday, even if Australia as a nation did not exist at that stage. Australian Aborigi nals boycotted celebrations, but very few noticed. They were excluded from public life and largely ignored in such considerations of national identity. When the sesquicentenary of British settlement took place in 1938, organised groups of Australians Aboriginals decided to make a point (Rights and freedoms, 1945 to present, n.d.).The Aboriginal groups planned a march from the Sydney Town Hall. When the groups were refused permission to meet at the Town Hall, they decided to march to the Australian Hall in Elizabeth Street. Even though this was to be a meeting of all Indigenous Australians, they were refused entry to the Australian Hall through the front door and were forced to enter through a rear door. The meeting was the first really effective all-Indigenous civil rights meeting in Australian history (Rights and freedoms, 1945- to present, n.d.).Five days after the Day of Mourning, William Ferguson and John Patten led an Aboriginal delegation to meet with the Prime Minister, Jos eph Lyons. This was the first time an Aboriginal delegation had been received by the Prime Minister. They presented Lyons with a ten-point political platform designed to establish compare for Aboriginal peoples. Some of the points that were put forward were, proposals for the takeover by the Federal Government of Aboriginal affairs,aid for education, housing, improved working conditions and land purchases for Aboriginal peoples and also improvedsocial welfare issues (Day of Mourning, 2012).The ten-point program was unsuccessful but the Aboriginal protest groups continued their fight. In January 1939, William Cooper wrote to the National Missionary Council of Australia to ask for help in promoting a permanent Aborigines Day. The Council concord to help with the funding and promotion. The Sunday after Australia Day was chosen as the date. The first Aboriginal Sunday was celebrated on 28 January 1940. This celebration only continued for 15 years. The Day of Mourning is often seen as the beginning of Aboriginal protests using European methods of seeking attention. Although they didnt get the results they were after, Aboriginal peoples were able to befool further attention to their plight, which resulted in additional support for their campaign to achieve equality (Day of Mourning, 2012).What we know today as the 1965 Freedom Ride had been inspired by the action of the same name by the civil rights movement in the USA earlier that decade. In much of rural Australia at that time, dispossessed, poverty sick Aboriginal people were confronted with petty racism within these towns by local people and businesses (Gary Foley, 2012). In 1965, a young Aboriginal student called Charles Perkins, from the Northern Territory, who was a student at a Sydney University, became involved at the university with a group of students from an organization called Student Action for Aborigines, (SAFA). The group included Ann Curthoys, who would later write a history of these events, Ji m Spigelman who would later become Chief Justice of the Supreme Court of New South Wales and Darce Cassidy, an arts student who was also a part-time reporter for the ABC. With these members of SAFA, Perkins would go on a bus tour into some of the most racist country towns in northern NSW and into history (Collaborating for Indigenous Rights, 2008).In these towns Aboriginal people were routinely barred from clubs, swimming pools and cafes. They were frequently refused service in shops and refused drinks in hotels. The students demonstrated against racial discrimination practised at the Walgett Returned Services League, the Moree Baths, the Kempsey Baths and the Bowraville look theatre. They not only challenged these practices, but they ensured that reports of their demonstrations and local towns peoples hostile responses were available for news broadcasts on radio and television. Outside of Walgett, Jim Spigelman trained his home movie camera on the convoy of cars which followed the bus out of town at night and ran it off the road. Darce Cassidy recorded the angry conversations and filed a report to the ABC (Collaborating for Indigenous Rights, 2008).Captured on immortalize was the vice-president of the Walgett Returned Service League Club who said he would never allow an Aboriginal to become a member. Such evidence was beamed into the living rooms of Australians with the level news. It exposed an endemic racism. Film footage shocked city viewers, adding to the mounting pressure on the government. In Moree (northern New South Wales), which was known to be a town where segregation was practised, the students focused on the swimming pool. The pool became a scene of tension and aggression as they attempted to assist Aboriginal children from the reserve outside(a) town to enter the pool while locals angrily defended the race-based ban (Collaborating for Indigenous Rights, 2008).Overseas newspapers such as theNew York Timesreported on the Freedom Riders and thei r reception in New South Wales country towns. Charles Perkins reported these events to a crowd of 200 attending the 1965 Federal Council for the Advancement of Aborigines and Torres Strait Islanders conference in Canberra. Conference goers heard that one positive result of the students activities was that the NSW Aborigines Welfare Board publicly announced that it would spend sixty-five thousand pounds on housing in Moree (Collaborating for Indigenous Rights, 2008).In the ensuing public debate, urban public knowledge of racial discrimination grew, some soul searching went on in the country towns, racial segregation was challenged and in some cases ended, and alternative ideas of inclusion, equality, and full citizenship rights were much debated. When the students returned to Sydney, they followed through by taking their research to the state authorities, contributing to inquiries and the campaign for the 1967 referendum that would appointment Aboriginal people equal rights as citiz ens (Rights and freedoms, 2012).Furthermore, the outcome of the 1967 referendum stated that citizenship was granted and Aboriginal people had the right to vote, of which is not strictly true. This was granted in 1962, when the race Electoral Actwas amended so that all Aboriginal and Torres Strait Islander people could vote. Unlike the situation for other Australians, voting was not arbitrary (Rights and freedoms, 1945- the present, n.d.).The lead up to the establishment of the Aboriginal Tent Embassy started in the 1970s, inspired by the Black Power movement in the United States. Aboriginal people were now politically very active. For example, in Sydney, Australias first Aboriginal legal and medical services were founded and Aboriginal people demandedland rightsfor the areas that they lived on. Land rights were considered the key to frugal independence, and land the base to generate resources and employment. To many it came as a shock when in April 1971 the Northern Territory Supr eme Court decided against Aboriginal people and in favour of a mining company to have access to Aboriginal land. Australian common law, the justice concluded, did not recognise Aboriginal land rights (Reconciliation Australia, 2012).Aboriginal people travelled to Canberra to ask the Prime Minister at the time, William McMahon, to give them title to their land, royalties from the mining operations, a right to consent to or reject further development on their land, and the land to be returned once mining operations finished (Korffs, J., 2012). The Prime Minister promised to look at ship canal to protect Aboriginal interests, but nine months later, on the eve of Australia Day 1972, announced that, instead of granting Aboriginal people title to their land, his government would ask Aboriginal people to apply for new fifty year general purpose leases over such land. They would also have to prove that they put that land to valid economic and social use. Aboriginal people had no title to m ineral and forest rights (Reconciliation, Australia, 2012).Angered by this announcement, Aboriginal people gathered in Sydney and decided that on Australia Day 1972 four representatives would travel to Canberra to protest against this decision. They were Michael Anderson from Walgett, Billy Craigie from Moree, Bert Williams from Cowra, and Tony Coorey from Tweed Heads. The four erected a beach umbrella surrounded by placards in front of Parliament House proclaiming it an Aboriginal Embassy (Korffs, J. 2012). A policeman on duty at the time reportedly asked the activists how long the protest would last. When told the Embassy would stay until Aboriginal Australians had land rights, the police officer replied that could be forever (Korffs, J., 2012).Key figures of the embassy, including Roberta (Bobbi) Sykes, Gary Foley and Michael Anderson, also helped to establish the Tent Embassy in the middle of the night on Australia Day in 1972. As well as highlighting significant symbolic goals, the embassy leaders had a list of practical demands that they wanted to negotiate. The demands were rejected and the police removed the tents and arrested a number of activists (Rights and freedoms, 1945- the present, n.d.).When Parliament resumed in mid February 1972, there were 11 tents on the lawns opposite Parliament House. Leader of the Opposition, Gough Whitlam, accepted an invitation from Embassy organisers to visit the tents and speak with representatives. This gave it further experience and legitimacy. Aboriginal journalist and activist John Newfong explained the purpose of the Embassy in an article in the Identity. Dr HC Coombs, chairman of the Council for Aboriginal Affairs, also accepted an invitation to speak with Embassy protestors (Collaborating for Indigenous Rights, 2008).In March 1972, Embassy leaders addressed 200 Australian National University students, asking for their support for the protest. Canberra university students billeted Aboriginal protestors, joined the crowd on the lawns, and opened a bank account for the Embassy through the Student Representative Council.Law students were invited to examine the legal position of the Embassy. Overseas visitors to the national capital, such as members of the Canadian Indian Claims Commission, visited the Aboriginal Embassy, as did Soviet diplomats and an Irish Republican (Collaborating for Indigenous Rights, 2008).This year on January 26th, 2012, the Tent Embassy held its 40th anniversary, making it the longest site of political agitation. The Embassy helped in the struggle for land rights and to end racial discrimination, sadly this is stock-still an ongoing struggle (Korffs, J., 2012).These three events all engaged in a fight for freedom, equality and human rights. These three events all protested for land rights, rights for freedom against discrimination and citizenship rights. Between 1900 and the 1960s there was some progress in the campaign for Aboriginal citizenship rights, but the gai ns were usually subject to strict conditions. In 1949 the Commonwealth granted voting rights to Aboriginal ex-servicemen and ex-servicewomen (Civics and Citizenship Education, 2012).At the time of Federation, Aboriginals were excluded from the rights of Australian citizenship, including the right to vote, the right to be counted in acensusand the right to be counted as part of anelectorate. In addition, they were not subject to Commonwealth laws. This then brought together various groups of peoples who would be involved in numerous protests over the years within these three events, and be the voice of the Aboriginal people (Civics and Citizenship Education, 2012).These three events signify what the Australian Aboriginal peoples went through and are still going through. This theme of the struggle for full citizenship rights is a significant and continuing part of Australias history. essential recognition of Australian Aboriginals is a significant step towards building a nation based on strong relations and mutual respect, which recognises the unique and special place of our first people (Towards Constitutional Recognition of Indigenous Australians, 2012).The recognition of Aboriginal people in the Constitution is another step in that journey, a step that is critical in our efforts to termination the gap (Towards Constitutional Recognition of Indigenous Australians, 2012). Educating people will lead to the understanding of Australian Aboriginals history and the struggle they have been through and are still going through. Only then will reconciliation take place within Australia.Therefore, by incorporating Australian Aboriginal peoples true past history into the Australian Curriculum will be a positive start for young people to gain knowledge and understanding of our wonderful Australian Aboriginal people, and what they went through. The Australian Curriculum states that it will ensure that all young Australians will be given this opportunity. Therefore, by gai ning deeper understanding and knowledge, they will begin to appreciate Aboriginal and Torres Strait Islander histories and cultures, their significance for Australia, and the impact that these have had, and continue to have, on our world Cross-curriculum priorities (The Shape of the Australian Curriculum, 2012).

Quantitation by Extraction

Quantitation by ExtractionSyed Masood Hassan AkbariINTRODUCTIONA liquid-liquid bloodline phase consists of a part (a) which is to be removed from the feed phase. The addition of a second phase (b) a solvent phase which is immiscible with the feed phase that the parting (a) is soluble in both the feed phase and the solvent phase. As it happens the solute (a) is transferred from the feed phase to the solvent phase. After extraction the feed and solvent phases argon called the raffinate and the extract phases respectively.Usually one of the two phases is an organic phase while the other is an aqueous phase. Under equilibrium conditions the distribution of the solute (a) over the two phases is heady by the distribution law. After the extraction the two phases potty be segregated because of their immiscibility. Component (a) is then separated from the extract phase by distillate and the solvent is then regenerated. Further extractions may be carried out to remove more of the compone nt (a).Once the product of interest has been extracted finally an absorbance reading can be found at its corresponding max.Figure 1 Shows the chemical structure of trimethoprim.Figure 2 Shows the chemical structure of sulfamethoxazole.This experiment consisted of three chief(prenominal) componentsThe quantification of trimethoprim and sulfamethoxazole in a suspension of Septrin.Interpreting the data self-possessed and using it in calculating the content of trimethoprim in Septrin.Interpreting the data ga thered and using it in calculating the content of sulfamethoxazole in Septrin.EXPERIMENTALExtraction of trimethoprim and sulfamethoxazole from SEPTRIN.Figure 3 Illustrates a schematic of the entire extraction procedure consisting of trimethoprim and sulfamethoxazole in SEPTRIN oral solution.Sulfamethoxazole (Standard, Sample and fair prep)Figure 4 Illustrates sulfamethoxazoles sample preparation.The standard was prep ared in the exact manner in a 250ml volumetric flask with using 0.2g of sulfamethoxazole in 50ml 0.1M NaOH and topping up with water. The procedure to follow was the exact akin as the sample prep.The vacuous was prepared in the same manner and water was used along with the reagents outlined above in sample prep.Trimethoprim (Sample and Blank prep)The already extracted bottom stage with chloroform was extracted again using four 50ml quantities of 1M acetic acid and the top layers were combined and washed with 5ml chloroform and the top layer added to a 250ml volumetric flask and filled with 1M acetic acid to the mark. 10ml of this solution was then added to another atomic number 6ml volumetric flask and 10ml of 1M acetic acid was also added and stand out up with water.The blank was made by using 0.2M acetic acid solution.RESULTSDetermining the quantity of trimethoprim and sulfamethoxazole in an oral suspension of SEPTRIN.Table 1 Shows the absorbance values obtained at each respective max for trimethoprim and sulfamethoxazole.CalculationsTri methoprimThe sample had a dilution factor of 11000 which meant that there were two dilutions carried out where the suspension was reduce to 250ml, which is a 1100 dilution. Secondly the sample was diluted too 100ml, which is a 110 dilution. These two dilutions steps combined gave a 11000 dilution factor. The calculations were carried out as below.2.5ml in 250ml1100 (Dilution ratio)110 (10ml in 100ml)Therefore 11000 dilution factor.Absorbance 0.332 x 1000 = 332A1%/1cm=204 so 1% solution has 204 absorbance1%conc = 204X = 332332(1)/204 = xX= 1.627% w/v It complies with the compliance limit of (1.44-1.76)% w/v.Sulfamethoxazole0.2g in 250ml200mg in 250ml (1100 dilution ratio)0.8mg in 1ml (150 dilution)0.016mg in 1ml (110 dilution)0.0016mg in 1mlSample of sulfamethoxazole absorbance = 0.075So, 0.0016mg in 1ml = 0.293And, x = 0.0250.0250.0016/0.293 = xX = 0.0001365mg in 1ml0.0001365mg in 1 ml x 50000 = 6.826mg in 1ml6.826mg in 1ml 0.06826g in 1ml 6.826g in 100mlX = 6.826% w/v It does no t comply with the compliance limit of (7.4-8.6)% w/v.Trimethoprim and SulfamethoxazoleThe concentration of trimethoprim and sulfamethoxazole in 5ml of SEPTRIN were calculated as shown below.Trimethoprim 1.627% 1.627g in 100mlSo, x in 5ml100x = 8.135gX = 0.08135g in 5ml SEPTRINSulfamethoxazole 6.826% 6.826g in 100mlSo, x in 5ml100x = 34.13gX = 0.3413g in 5ml SEPTRINCONCLUSIONThe active ingredients in SEPTRIN, trimethoprim 1.627% w/v and sulfamethoxazole 6.826% w/v were segregated by extraction. The concentrations of trimethoprim and sulfamethoxazole in the 2.5ml suspension were calculated to be as stated above respectively. The content of trimethoprim fell within the compliance limit but for the sulfamethoxazole the content fell a bit briefly of the compliance limit suggesting apparatus malfunction or human error in making up sample. Trimethoprim complies with the limit set out on the BP but for sulfamethoxazole it falls under the limit stated on the BP.QUESTIONSIllustrate the ex traction procedure.Support the separating funnel in a ring clamp on a ring stand. Make sure the stopcock of the funnel is closed.Place a stemmed funnel in the neck of the separating funnel. Add the liquid to be extracted, then add the extraction solvent. The total volume in the separating funnel should not be greater than 75% of the funnel volume.Insert a hype in the neck of the separating funnel.Pick up the separating funnel with the stopper in place and the stopcock closed, and shake it once gently.Point the stem away from your baptistry and slowly open the stopcock to release some build-up of excess pressure, reclose the stopcock and repeat this procedure until only a small amount of pressure is released with it is vented. induce the funnel vigorously for a minute, release the pressure and then again repeat the step of shaking a few times till there is less pressure and the solutes are at equilibrium between the two solvents.Place the funnel back into the ring and let it rest u ndisturbed until the layers are clearly segregated. While waiting, remove the stopper and place a beaker under the separating funnel.Carefully open the stopcock and allow the lower layer to drain into the beaker. bolt just to the point that the upper liquid barely reaches the stopcock.The top layer can be left in the separating funnel if further extractions need to be carried out which do need to be carried out. When finished with the separating funnel store the stopper away from the funnel.Explain why sulfamethoxazole is soluble in the base-forming aqueous solution and trimethoprim is not?It is already known that trimethoprim is classified as a benzylpyrimidine and it protentiates the antimicrobial activity of sulphonamides eg., sulfamethoxazole. So trimethoprim has a tendency to form non-water-soluble complexes when combined with sulfamethoxazole in alkaline aqueous media.Write out the chemical reaction which leads to the coloured product.The reaction mechanism above shows the coloured color agent N-(naphthalene-1-yl)ethane-1,2-diamine reacting with the diazonium to form the coloured product.Why is ammonium sulphanate added? What would happen if it was forgotten?AMS is used as a reagent to speed up the chemical reaction if it is not included in the reaction before adding the dying agent then the process will either delay in reaching to its completion or not reach it at all.After extraction of sulfamethoxazole, how is the organic solvent processed?The organic solvent was extracted in four 50ml quantities of 1 M acetic acid. The upper layers were all combined and kept and washed with 5ml of chloroform. The top layer was then dispensed into a 250ml volumetric flask and topped up with 1 M acetic acid. 10ml of this solution was transferred to a 100ml volumetric flask, 10ml of 1 M acetic acid was also added and the flask was topped up with water. A blank was made and the sample from the organic layer was read at 271nm.

Pesticides In Ground Water and Drinking Water :: Drinking Water Quality

What is a pesticide?A pesticide is a chemical substance used to kill pests, peculiarly insects. A pesticide is also refered to as a biocide. Most pesticides are use in spray form but occasionaly you will see pesticides that are in powder or pellet form. Pesticides are used on a variety of things, anything from crops like corn, barley, and wheat, to plants like petunias, marigolds, and rhodadendrons, which are usually found in handsome gardens greenhouses, and even in your backyard. What is ground water? Water is the life blood of every living creature on earth. Approximately 70 percent of the earths originate is covered with water. Through the wonders of nature, water can take on many different forms. It is easy to understand the significance water plays in our lives but it may be difficult to understand the water that exists below the earths surface. This water is called groundwater. Groundwater is usually held in porous soil or rock materials, much the same manner water is hel d in a sponge. The source for much of the worlds drinking water is ground water.When pesticdes are sprayed on crops, where do the pesticides go after they are applied to the crops? They soak into the ground where the root can pick up the pesticide.That further proves my point that pesticides soak into the ground. Pesticides in ground watrer seems to be a continual line with people now days, because they think that the pesticides dont soak into the ground water. They believe that when a pesticide is sprayed on a plant the leaves are what pick up the pesticide but thats false, the roots pick up the pesticides which proves that the pesticides have to soak at least a few feet into the ground.

First-class Opportunities for Mature Students Essay -- Postgraduate Stu

A recent report has outlined several ways for universities to adapt to the rising amount of older learners seeking higher education. Published by Universities UK, the document addresses the growing demand for courses which are tailored to the needs of students who obtain completed their careers.The text says that, due to the projected rise in older learners based upon the increased life expectancy of the UK population and the multiplying numbers of HE applications by this market universities need to find fresh ways of adapting to and supporting an ageing population.Within the document, the authors call on universities to assist in promoting demographic veer Professor Chris Phillipson and Jim Ogg (both Keele University staff) say that a changed perception of older generations, and their role within society, can be promoted by higher education institutions through the introduction of vestigial alterations.The text advises universities to increase their involvement with support s ervices aimed at older people, and to actively encourage psychological health in over 50s, ...