Julius Caesar Essay Example | Topics and Well Written Essays - 1250 words

Julius Caesar - Essay Example Moreover political corruption was prevailed to the full extend, and the entire Mediterranean suffered from the inefficient administration of Rome. Just about since 133 B.C. in Rome itself had began continuous period of disorders. Politics, generals and demagogues fought for the power. Partisan armies (such as army of Marius in 87 B.C. and the army of Sulla in 82 B.C.) passed Rome marching. Although the Senate's incapacity to govern was clear to everybody, the majority of Roman citizens wanted to restore the republic government. Julius Caesar was, probably, the first political leader, who clearly understood, that this government was no longer worth of being preserved. Caesar came from the family of patricians, which itself had been originated from Julus - the son of Aeneas, the legendary Trojan hero, who had been born by the goddess named Aphrodite (Venus). Having such renowned ancestors, it was rather simple to Caesar to get a high post in the Roman republic. However, following the family tradition he became a priest of Jupiter, the supreme God of Rome. Strict rules forbade him to leave the city more than for two nights, to divorce with the wife, and to take weapon in his hands. But Julius's fate predetermined the other. Roman politics was divided between two factions, the optimates, who favored aristocratic rule, and the populares, who preferred to appeal directly to the electorate. He became one of the leaders of the populares party, but his patrician origin prevented him from holding the position of tribune, which Caesar had so much wished for. The majority of Caesar's family belonged to the senatorial party of optimates, which represented the interests of old aristocracy. However, Caesar from the very beginning of his political career joined to populares. The reason for this was his kinship to Gaius Marius, a great soldier, whose outstanding career had become an exemplar for young Julius. Caesar' mother Aurelia Cotta occurred from the notable patrician family, and was a real example of Roman matron, whose strictness and exactingness helped to bring her son up as a real soldier and statesman. They lived in a modest house in the Subura, a lower class neighborhood of Rome2, where Marcus Antonius Gn ipho, an orator and grammarian, who originally came from Gaul, was employed as Caesar's tutor.He got a good education and went in for politics in his youth. In 68 B.C. Caesar became the quaestor. His main responsibility was to control the state exchequer and finances. From now it gave him the right to be named the Senator. On being appointed to the position of Aedile, whose responsibility was

Williams Syndrome - Genetic Pediatric Illness Research Paper

Williams Syndrome - Genetic Pediatric Illness - Research Paper Example   After some time, A.J. Beuren came across his own set of 11 patients who also had the same symptoms as described by Dr Williams in the past. Thanks to his contribution to the study of what was then an unknown illness, the disease was named after the two men who contributed the most its understanding, Williams-Beuren Syndrome. However, the illness has also come to be known by other illnesses over the years. Physiopedia (2011) lists the other names as follows: Dr. Aneal Khan M.D., who authored an article regarding Williams Syndrome for Medscape Reference (2011) described the clinical manifestation of the illness to include; â€Å"a distinct facial appearance, cardiovascular anomalies that may be present at birth or may develop later in life, idiopathic hypercalcemia, and a characteristic neurodevelopmental and behavioral profile†. The disease does not seem to afflict anyone specific gender, ethnicity, race, or socioeconomic background. However, it does seem to be most prevalent among children, affecting 7500 of every 20000 births. The most common symptoms of the birth defect according to Dr Rob Hicks (2011) include but are not limited to: Various in-depth studies of the illness link Williams Syndrome to the genetic makeup of an individual. Dr Rob Hicks (2011), author of â€Å"Williams Syndrome† for BBC Health explained that WS afflicted individuals most often have a defect in the DNA chain of chromosome 7 with about 26 genes deleted from its long arm. Unfortunately, chromosome 7 is one of the most important elements of the human gene as this particular gene is tasked with the manufacture of the protein elastin which according to Dr Hicks (2011), is â€Å"is responsible for providing strength and elasticity to blood vessel walls. â€Å" Babies born with Williams Syndrome are often underweight upon birth with difficulty in gaining weight and have certain development defects such as speech problems with the ability to speak not becoming present until the age of 3. However, the most concerning matter of this illness is the widespread Cardiovascular complications associated with it.  Ã‚  

What I Have Learned Essay Example for Free

What I Have Learned Essay The past three weeks I can say that I have learned quite a lot, I never really thought I could understand what entailed through organized crime. There are many different attributes that were involved to form organized crime. Without knowing exactly what those attributes are you would never be able to figure out what it takes to organize crime or even get why they call it organized crime. I would say to myself why do these mafia and big groups put so much time and effort into making sure that there plans to through and who heads up their plans because of the path that has been set from organized crime. I will be explaining the major areas concerning the foundations of organized crime. What two definitions best fits organized crime, how organized crime gained a foothold in the United States, How organized crime groups sought to influence government and the organization of organized crime groups in the post-Prohibition era. Conventional criminals are different from the persons that are involved with organized crime through variety and a larger scale. Organized crime has no political agenda. In every group or family there is a main boss, underboss and follows down the ladder. There are qualifications to be accepted into any crime family or group. In these groups they feel as if they are untouchable that they do not need to follow any laws, people must follow their laws. In any group they must keep their group strong so they have to constantly find new members, they only look for individuals who they think will be beneficial to their group. When a member is finally accepted into a family there are still rules and regulations that must be followed, if these rules are not followed your consequences could be death. Every person and/ or organization will have their own definition when it comes to organized crime it is like terrorism; every organization has its own definition to what consists of a terrorist. According to Donald Creesy organized crime is any crime that is committed by a person occupying in an establishment of labor, a position that is designed for a person from the commission to be that of a corrupter, a position for the corruptee, and one position for the enforcer. Donald Creepy’s definition I think is actually a good definition that truly can identify was the commission’s main task was for. I mean if you think about it the commission will find someone that is behind the lines of a company that they need ties with to get them the information and goods they need for the mob. Michael Maltz has a different perspective on the definition for organized crime. He says that organized crime is a crime that is made from more than one person, and the persons that are involved stay to be associated with each other for the purpose to succeed in committing the crimes. Michael Maltz also has a great definition because he wants every person that is involved with organized crime to be found at fault. For myself I would have to agree with Maltz because I do believe that every person that is involved with organized crime should be found guilty. How do you think you are going to stop a problem from happening if you do not try to find every person who is involved guilty; everything would stay the same and the matter would not be fixed. The attributes of organized crime are as follows has no political goals, is hierarchical, has limited or exclusive membership, constitutes a unique subculture, perpetuates itself, exhibits a willingness to use illegal violence, is monopolistic, and is governed by explicit rules and regulations. These eight attributes pretty much can show you how if they are not implemented then a group’s plan will not go as planned. As a part of the set of attributes it is only natural for a group to make sure that when they set up a plan every step that was made should be followed.

Pv Value in a Seal Questions and Answers

Pv Value in a Seal Questions and Answers Question 1 (4 marks) List 4 important parameters (not the equation parameters) that are determined by the Pv value in a seal. The suitability of material combinations for the seal faces. The amount of heat generated at the face It also follows that at a given rotational speed An increase in shaft diameter since implies an increase in the Pv value. Assessor Feedback Question 2 (4 marks) The contact property of the interface is influenced by which component in a seal unit? What is the need for seal balance? The fluid pressure in the axial direction is the only pressure component influencing the contact property of the interface. The fluid pressure in the axial direction is the only pressure component influencing the contact property of the interface. Thus, only this component is considered for seal balance and further used to compute the resulting contact force acting on the face. Assessor Feedback Question 3(8 marks) Given the following data, calculate the face area, spring pressure and balance ratios (external and internal) of a seal, for both externally acting and internally acting pressures. Is this Balanced or Unbalanced and why? Seal face contact outer diameter, D = 61.8 mm Effective seal balance diameter, B = 52.6 mm Deal face contact inner diameter, d = 49.2 mm Spring force at working length, F =188 N Calculate the face area of the seal: Α=à Ã¢â€š ¬(D_0^2-D_1^2 )/4 Α=à Ã¢â€š ¬(à £Ã¢â€š ¬-68.2à £Ã¢â€š ¬-^2-à £Ã¢â€š ¬-49.2à £Ã¢â€š ¬-^2 )/4 =1098.46 à £Ã¢â€š ¬-mmà £Ã¢â€š ¬-^2 A=0.001098à £Ã¢â€š ¬- mà £Ã¢â€š ¬-^2 Calculate the spring pressure: P_sp=F_sp/A =188/0.00109846 =171148.7 à £Ã¢â€š ¬-N/à £Ã¢â€š ¬-_(m^2 ) =P_sp 0.17115 MPa Calculate the balance ratio for the external loading: B=(D_0^2-D_b^2)/(D_0^2-D_t^2 ) Α=(à £Ã¢â€š ¬-61.8à £Ã¢â€š ¬-^2-à £Ã¢â€š ¬-52.6à £Ã¢â€š ¬-^2)/(à £Ã¢â€š ¬-61.8à £Ã¢â€š ¬-^2-à £Ã¢â€š ¬-49.2à £Ã¢â€š ¬-^2 ) =1052.48/1398.6 B=0.753 (B Calculate the balance ration for the internal loading B=(D_b^2-D_t^2)/(D_0^2-D_t^2 ) Α=(à £Ã¢â€š ¬-52.6à £Ã¢â€š ¬-^2-à £Ã¢â€š ¬-49.2à £Ã¢â€š ¬-^2)/(à £Ã¢â€š ¬-61.8à £Ã¢â€š ¬-^2-à £Ã¢â€š ¬-49.2à £Ã¢â€š ¬-^2 ) =346.12/1398.6 B=0.25 (B Assessor Feedback Question 4 (4 marks) From the following single mechanical seals, identify the 7 sealing components and other mechanical components, briefly describing their functions? 1)Mating Ring. 2)Primary Sealing Ring. 3) O-ring. 4) O-Ring. 5) Disc. 6) Spring. 7) Retainer. Fluid is to be kept from escaping where the shaft extends through the housing, especially as the shaft rotates. A ring, part 1, with an O-ring, part 4, is sealed against the housing of the container. It is called the mating ring. Another ring, part 2, with an O-ring, part 3, is mounted onto the shaft. It is called the primary sealing ring. The contacting faces of these rings are lapped flat, within light bands. Initial contact between the faces is maintained by a spring, part 6, which pushes them together. The spring reacts against a retainer, part 7 Assessor Feedback Question 5 (4 marks) What difference do you notice between the two mechanical seals shown below. Name them and describe their application. Shows of an outside balanced seal. The shaft packing is forced against the retainer, leaving an area under the seal ring exposed to stuffing box pressure. The closing force exerted by the stuffing box pressure, acting against the shoulder of the seal ring, is slightly greater than the opening force exerted by the liquid film between the faces, thereby keeping the faces in contact at all times. Inside balanced seal illustrates a conventional inside seal that has been balanced. Notice that a step in the shaft has allowed the sealing face of the mating ring to be moved radially inward without decreasing the width of the face itself. The primary sealing ring remains mounted on the original shaft diameter, which means that the closing force remains unchanged. Because we have successfully exposed more of the primary sealing ring face to hydraulic pressure working to open the seal, the design is considered balanced. Assessor Feedback Question 6 (4 marks) Name the primary sealing elements in a single mechanical seal. 1) Primary sealing surfaces. 2) Secondary sealing surfaces. 3) a means of actuation. 4) a means of drive. Assessor Feedback Question 7 (4 marks) While its accepted that solid alumina ceramic seal rings will be considerably more expensive than ceramic coated steel rings, why should they be the preferred choice between the two types of seal ring? When handling corrosive fluids at moderate pressures and velocities: alumina ceramics may be employed as thin coatings or solid rings (preferred!!) For highly corrosive fluids: high purity ceramic alumina can be used. Alumina ceramics have: Relatively low tensile strength Poor resistance to thermal shock Low thermal conductivity High elasticity modulus Assessor Feedback Question 8 (4 marks) Which dynamic secondary sealing element is the preferred type to handle axial movement? Give reasons for your answer. What type of damage does a wedge type secondary seal do to pump shafts/sleeves? Explain how this mechanism works. The pusher type of mechanical seals move axially along the rotating shaft or the sleeve to maintain the contact with the faces of the seal. This feature of these seals helps compensate for the wearing that may occur at the seal face, and wobbling due to misalignment. The pusher types of mechanical seals are used commonly, are less expensive and are easily available in the market in wide range of sizes and designs. The only disadvantage of these seals is that they tend to hang up and sometimes there is fretting of the shaft. Pusher seals utilize a dynamic secondary seal which moves axially with the major seal face. which is either an O-ring, wedge or other type of equipment, across the shaft as a means of compensation for face wear and/or shaft movement. For high temperature (up to 500 deg F) or aggressive chemicals a Teflon wedge ring may be used. Since Teflon is plastic and does not rebound like elastomer, it has to be pushed by spring force into the wedge shaped opening to maintain a seal on the shaft. Non-Pusher type or Bellow seals have no dynamic secondary seal under the movable seal ring. Check Which dynamic secondary sealing element is for axial movement. Operation does not cause shaft wear pusher type seals can handle bi-directional shaft rotation, large pressure, temperature and speed excursions. Assuming a spring-loaded Teflon wedge can also be used as a dynamic shaft seal behind the rotating primary seal ring. The spring and process pressures keep the wedge in contact with the shaft. Like chevrons and U-cups, wedges can only seal in one direction. Because of the tendency for Teflon to cold flow, almost all wedges need to be loaded by one or more springs along with the process pressure. Wedge seals often cause shaft damage by fretting. Assessor Feedback Question 9 (4 marks) What is the distinct advantage offered by a bellows seal? How can the design be improved to accommodate higher pressures? Which bellows material offers the best corrosion resistance? One of the most frequent and serious problems valves face is gland leakage, results in wasted and increased plant downtime. Apart from the high cost of energy losses, Gland leakages can also cause serious environmental, ecological and health hazards to plant workers and personnel. Leakage of sensitive material can also constitute to a fire hazard, explosion, or damage to equipment by corrosive material. Air entering the pipeline could produce inflammable explosive or poisonous mixtures. Gland packed valves often demand continual maintenance in accessibility creating particular difficulties. The bellows comply to conditions at high temperatures and are capable of withstanding over 10,000 cycles without failure. Bellow Seals are also known as Zero Leak Valves or Emission Free Valves The multi-ply bellow design is preferred for handling higher pressure fluids (generally two or three plies of the metal wall). A two ply bellow can increase its pressure rating by 80% to 100% as compared to a single ply bellow of the same thickness. Alternatively, if a single ply bellow of a thickness equivalent to a pressure rating of a two ply bellow is used, the stroke length is reduced. Thus, a multi-ply bellow design offers a distinct advantage over a single ply bellow. The stainless steel bellow material AISI 316Ti which contains Titanium to withstand high temperatures. Alternatively, Inconel 600 or Inconel 625 improve fatigue strength and corrosion resistance as compared with stainless steel bellows. Similarly, Hastalloy C-276 offers greater corrosion resistance and fatigue strength than Inconel 625. Fatigue resistance can be improved by using a multiply bellows system and reducing the stroke length; this can significantly increase the bellow service life. Assessor Feedback Question 10 (6 marks) Do a comparative analysis of inboard and outboard mounting of seals. Inside-mounted seal is the most common in the industry and the most energy-efficient when compared with other sealing methods, such as packing and seal less equipment. They are used in all industries with respect to fluid types and the seals property ranges, pressure speed, diameter and temperature. Inside seals are mounted within the equipment seal chamber the advantages of this design include: The seal can be cooled by the pumped fluid in an enlarged dead-ended chamber, by a product bypass flush or by a clean external flush. Depending on the seal chamber design, the rotary action of the seal assembly may help keep debris away from the seal faces. With proper hydraulic balancing, the product pressure helps keep the seal faces closed. Catastrophic leakage is usually avoided during seal failure. Leakage can be restricted by the stationary elements in the gland. Inside seals are available in many materials and designs. Environmental controls are easily included in the design. Centrifugal forces tend to reduce leakage. Outside seals are mounted external of the equipment housing the advantages of this design include: Outside-mounted seals can be used when the radial or axial space in the chamber is not adequate or access is not available for an inside seal installation. Installation may be easier than with an inside seal. However, most equipment designs still require à ¢Ã¢â€š ¬Ã‚ ¨some disassembly. Less expensive materials may be used since à ¢Ã¢â€š ¬Ã‚ ¨many components may not be exposed to the pumped product. The seal can be observed and monitored for seal à ¢Ã¢â€š ¬Ã‚ ¨face wear. Adjustments can be made without à ¢Ã¢â€š ¬Ã‚ ¨equipment disassembly. The seal can often be backed-off for cleaning. Assessor Feedback Question 11 (8 marks) Explain the difference between static and dynamic seals? 0-rings are used for effective sealing in applications. Mostly, they are used to help repair or correct any manufacturing or installation defects seen in glands. 0-rings can be used in static as well as dynamic applications. The make of both these 0-rings will be different owing to the difference in application requirements. The following are some major differences between static and dynamic 0-rings: The material used to manufacture dynamic 0-rings should be tougher than that used to manufacture static 0-rings.This is because the dynamic 0-ring will have to undergo movement while the application is functioning. In dynamic applications, the surface finish and material of the gland should be such that it doesnt abrade the 0-ring during movement otherwise, the 0-ring could tear this is irrelevant in static applications, where the 0-ring doesnt move. 0-rings used in dynamic applications are likely to wear at a faster rate as compared to static 0-rings. This is because dynamic 0-rings are constantly moving. Hence, the interval of maintenance procedures for dynamic 0-rings should be shorter than that of static 0-rings. à ¢Ã¢â€š ¬Ã‚ ¢All 0-rings should be properly lubricated at all times. à ¢Ã¢â€š ¬Ã‚ ¢Dyna mic 0-rings require more lubrication than static ones. Depending on the application, static or dynamic seals will be used. O-rings are useful in a varied number of industries and applications. They are effective across a wide range of temperatures and pressures. However, using the right 0-ring for each application will help you increase the reliability and service life of the 0-ring. You can consult with your 0-ring manufacturer on the best fit for your application Assessor Feedback Question 12 (4 marks) Why are mechanical seals preloaded? Name four of the most common types of preloading for pump seals. Depending on the application it may be necessary to have either a positive or a negative operational clearance in the bearing arrangement. In the majority of applications, the operational clearance should be positive, i.e. when in operation, the bearing should have a residual clearance, however slight. However, in many cases, machine tool spindle bearings, pinion bearings in automotive axle drives, bearing arrangements of small electric motors, or bearing arrangements for oscillating movement, where a negative operational clearance, i.e. a preload, is needed to enhance the stiffness of the bearing arrangement or to increase running accuracy. The application of a preload, e.g. by springs, is also recommended where bearings are to operate without load or under very light load and at high speeds. In these cases, the preload serves to provide a minimum load on the bearing and prevent bearing damage as a result of sliding movements of the rolling elements, Helical Compression Spring, Wave Washer Springs, Single Belleville Washer Springs, Elastomeric Preloading Assessor Feedback Question 13 (4 marks) The table below contains a list of commonly used seal materials. For the given set of temperatures in degree centigrade, indicate the suitability of these materials by marking S for suitable and LS for limited suitability of short period durations. Type of Material Temperature in  ° C 50 100 200 300 350 Natural Rubber S S LS Nitrile S S S LS Neoprene S S S LS Viton S S S S S Silicone S S S S S Fluoro-elastomer S S S S S Question 14 (4 marks) What are the characteristics that make pure carbon-graphite the most favoured material in the chemical industry? Strongly anisotropic, Greasy feel, Readily marks, High thermal conductivity, High tensile strength, Low thermal expansion coefficient, Good resistance to thermal shock. Assessor Feedback Question 15 (4 marks) Ignoring temperature limitations, what type of elastomeric material would you suggest for the following applications? Sealing for Vacuum systems Buna-N, silicone, Fluorocarbon, and Perfluorocarbon Applications Vacuum systems Polyurethane Rotary shaft seals Fluorocarbon, Polyacrylate Applications that require high tear and abrasion resistance Natural Rubber Question 16 (4 marks) Why is it difficult to achieve a perfectly uniform load distribution across the shaft circumference, when using a single coil spring? What does this condition further lead to? What are the main advantages associated with the use of multi-coil springs? Typically, a single-coil spring used for a seal head has a relatively large wire cross section and therefore provides more substance to combat corrosion from the system fluid. But it is rigid in construction because of which there is difficulty in achieving a perfectly uniform load distribution across the shaft circumference. This may in turn lead to distortion of the primary seal ring face and this is particularly critical at high rotational shaft speeds. This arrangement consists of a series of small coil springs uniformly distributed along the circumference of the seal cartridge. The chief advantage with this design is that the possibility of distortion of the primary seal ring face is minimized and this is particularly true at higher rotational speeds of the shaft. The use of multiple-coil springs makes seal design independent of seal diameter sizes. Deterioration arising from chemical corrosion can be greatly minimized by the use of stainless steel for spring manufacture. Assessor Feedback Question 17 (4 marks) What is the three-point contact method? Explain in brief, the procedure involved. Three-point contact method where three setscrews positioned at 120 ° from each other ensure squareness of the rotating face, by deforming the sleeve to the shaft OD. Another set of three setscrews also located 120 ° apart and positioned between the earlier set of screws, enable locking of the sleeve to the shaft. Assessor Feedback Question 18 (4 marks) Metal impregnations are sometimes added to graphite seal rings in order to improve their properties. Give three areas of concern when selecting these metal additions. Both the metal filler and the carbon have to be compatible to the sealed liquid. The metal will heat up and expand more rapidly than the carbon. The coefficient of friction of the metal will be higher than the parent carbon and the seal face will run hotter than if it were made just from pure carbon. Assessor Feedback Question 19 (4 marks) Outline the nature of seal malfunction that may be caused by the following: Incorrect pressure differential between inside and outside seal face sets Cavitation or vaporization of liquid between sealing faces Thermal distress of material Large bearing clearances A change in temperature. Many products solidify at temperature extremes, the product is taking a pressure drop across the seal faces and solidifying. The inner face of a back to back double seal application is not positively locked in position. A snap ring must be installed to prevent the inboard stationary face from moving towards the rotating face when the high pressure barrier fluid pressure is lost or overcome by system pressure. Erosion / Corrosion. An accelerated attack caused by a combination of corrosion and mechanical wear. Vaporization, liquid turbulence, vane passing syndrome, and suction recirculation are special cases often called cavitation. Solids in the liquid and high velocity increase the problem Heat checking is caused by thermal distress of the material resulting in small radial cracks. Scoring may be present or uneven wear with the heat checking on the high spots. Occurs typically with tungsten carbides and silicon carbides Seal drips when stationary and when the shaft is rotating. Seal may pop from flashing during operation. The tendency for a seal to wedge is enhanced by a rough surface, lack of lubrication and high reciprocating speeds. Wedging is unlikely to occur with small clearance gaps in the range of 0.0550.127mm (0.002-0.005 inch). For clearances greater than 0.25 mm (0.010 inch) the possibility of wedging always exists as the radial clearance increases, the axial clearance increases as well the more room (radial clearance), the more the elements can shift in relation to each other. With a higher clearance there is more tolerance of thermal expansion effects, differential temperature between the inner and outer faces. Assessor Feedback Question 20 (4 marks) The leakage rate in a seal while running is found to be constant. Can the reason be attributed to a damaged seal face? State three important causes for each of the below: Intermittent leakage There is a leak between the face and the holder that becomes visible only when the unit comes up to operating temperature. A bending or bent shaft is causing the seal outside diameter to contact the inside diameter of the stuffing box, or some other stationary object. The shaft/ sleeve is too large in diameter and it is restricting movement of the seal. Spring loaded dynamic elastomers such as Teflon ® wedges, U- cups, chevrons and spring loaded O-ring designs are very sensitive to this problem Constant dripping in a seal. There is damage in the O-ring groove. Maybe the O-ring was removed with a sharp metal instrument and this has caused a scratch in the O-ring groove. Leaking between the gland and the stuffing box. This leak path is very visible in most applications Leaking between the cartridge sleeve and the shaft Question 21 (6 marks) It is a requirement to identify and select a suitable mechanical seal for a given application and process. What is the nature and type of questions that you would raise, in order to help arrive at the right selection? General Selection Considerations The process of mechanical seal selection involves a thorough evaluation of many important factors that include: Shaft diameter Rotational rubbing speed in the contact faces Service temperature Process fluid pressure Physical and chemical properties of the various liquid constituents Mechanical/structural properties of the primary seal components Environmental control systems Properties and resistance characteristics of the secondary sealing components. Pressure. Assessor Feedback Question 22 (4 marks) Which of the following conditions satisfy the requirements for sealing high-speed applications? Explain in brief: Lower spring load at seal faces Increased hydraulic balance ratio Face combinations such as carbon vs. tungsten carbide Stationary seal designs Number 4. Stationary seal designs: The Internal seal configuration, with the seal heads mounted stationary and the seal seats rotating with the shaft is advantageous, especially in high-speed applications where dynamic balancing considerations demand minimum mass of the rotating parts Assessor Feedback Question 23 (6 marks) A change in pumping fluid temperature adversely affect the seals in the stuffing boxes. What are the effects and How do you control the temperature in the stuffing box and the seal? a)Many fluids are adversely affected by a change in their temperature, and when this change takes place, seal failure is almost sure to follow. The failure can take several forms: Coated hard faces can heat check (crack). Elastomers can take a compression set and crack at elevated temperature Cold temperatures can cause elastomers to harden. The liquid can crystallize, restricting seal movement and open the faces. The liquid can vaporize between the faces forcing them open. The viscosity of the fluid can change either restricting seal movement, or making the fluid less of a lubricant. The liquids corrosion rate will double with an 18 ° Fahrenheit (10 ° C) rise in temperature. The liquid can convert to a film between the sliding seal components, restricting their movements. The magnetite that forms in hot water is a good example of this. A film can form on the seal faces causing them to separate. Lapped seal faces can distort and go out of flat at elevated or cryogenic temperatures. b) A balanced mechanical seal and installed at the proper compression, is your best insurance against a significant rise in stuffing box temperature: Proper face balance. 70/ 30 is the most common to 5000 fpm. (25 Meters per sec.) Low friction face materials. Carbon/graphite vs. a silicon carbide hard face is the best. The correct spring compression to control face loading. Faces with good heat conductivity. Tungsten carbide and silicon carbide have excellent thermal conductivity compared to most other hard face materials. A small cross section carbon/ graphite face press fitted into a metal holder is better than solid carbon/ graphite for removing heat from between the lapped faces. Sometimes, that is not good enough, so occasionally youll have to come up with some additional method of controlling the temperature in the stuffing box area and between the lapped seal faces. A heating /cooling jacket, quench flush or drain connection, dual seal, heat exchanger Assessor Feedback Question 24 (4 marks) The mechanical shaft seal should be selected according to the operating conditions at the shaft seal location. What important factors must be considered when selecting a mechanical shaft seal? For a specific ap

The Visual Re-Creation of Orpheus :: Jean Cocteau film Orpheus

The Visual Re-Creation of Orpheus Jean Cocteau’s film Orpheus (1949) is an adaptation of the Greek mythological figure of the same name. The alteration of the story into the visual medium of cinema is an interesting one. The use of cinematography in the film is creative, and it incorporates the essence of the myth with Cocteau’s own allegorical imagery. The symbolism of characters and events accompanied by the use of visual effects create a message that is uniquely significant. The special effects are the primary contributor to the distinctive features of Cocteau’s revision of the literary version. The devices that are incorporated in Orpheus, such as running the film backwards (the inversion of time) and using the photographic negative in some environments (inversion of space), function in numerous ways. On the surface, they add a mystique to the diegetic world that connotes the supernatural and uncanny nature of the narrative. In a more subtle way, however, they function psychologically to expose the viewer to the functions and subordinate machinations of the visual medium. In a way that is unique to the cinema, the special effects disrupt the pleasant continuity of the viewer. This disjunction is inherent in the ethereal nature of their circumstances and concomitant with its mythic origin. The psychological fraction of cinema is the specialty of Jean-Louis Baudry in Ideological Effects of the Basic Cinematographic Apparatus. He champions the idea that in order for the ideological infrastructure of a film to be successful, it must abide by certain filmic rules and not remind the viewer that they are simply witness to a representation (rather than a presentation, or a reality). The moral of the Orphic myth, â€Å"Don’t look back,† seems to be a historical analog of Baudry’s thesis. The warning itself applies to both Orpheus and the viewer of the film (â€Å"Don’t look at Eurydice†, and â€Å"Don’t look at the apparatus†). In this respect, the message of the Orphic myth is similarly the message of Cocteau, from a cinematic standpoint. Thus, it is the particular circumstances of the cinematic medium that multiply the efficacy of Orpheus. For proof of Cocteau’s intention in creating this meaning, his previous film with actor Jean Marais serves as the best example. Beauty and the Beast (1946) begins with a note to the viewer to remain focused on the â€Å"Once Upon a Time† mentality while watching the movie. This preface is another example of the intentional shift of focus away from the awareness of representation and towards a passive viewing experience. Later in the film, a mirror speaks to the protagonist: â€Å"I am your mirror, Belle. The Visual Re-Creation of Orpheus :: Jean Cocteau film Orpheus The Visual Re-Creation of Orpheus Jean Cocteau’s film Orpheus (1949) is an adaptation of the Greek mythological figure of the same name. The alteration of the story into the visual medium of cinema is an interesting one. The use of cinematography in the film is creative, and it incorporates the essence of the myth with Cocteau’s own allegorical imagery. The symbolism of characters and events accompanied by the use of visual effects create a message that is uniquely significant. The special effects are the primary contributor to the distinctive features of Cocteau’s revision of the literary version. The devices that are incorporated in Orpheus, such as running the film backwards (the inversion of time) and using the photographic negative in some environments (inversion of space), function in numerous ways. On the surface, they add a mystique to the diegetic world that connotes the supernatural and uncanny nature of the narrative. In a more subtle way, however, they function psychologically to expose the viewer to the functions and subordinate machinations of the visual medium. In a way that is unique to the cinema, the special effects disrupt the pleasant continuity of the viewer. This disjunction is inherent in the ethereal nature of their circumstances and concomitant with its mythic origin. The psychological fraction of cinema is the specialty of Jean-Louis Baudry in Ideological Effects of the Basic Cinematographic Apparatus. He champions the idea that in order for the ideological infrastructure of a film to be successful, it must abide by certain filmic rules and not remind the viewer that they are simply witness to a representation (rather than a presentation, or a reality). The moral of the Orphic myth, â€Å"Don’t look back,† seems to be a historical analog of Baudry’s thesis. The warning itself applies to both Orpheus and the viewer of the film (â€Å"Don’t look at Eurydice†, and â€Å"Don’t look at the apparatus†). In this respect, the message of the Orphic myth is similarly the message of Cocteau, from a cinematic standpoint. Thus, it is the particular circumstances of the cinematic medium that multiply the efficacy of Orpheus. For proof of Cocteau’s intention in creating this meaning, his previous film with actor Jean Marais serves as the best example. Beauty and the Beast (1946) begins with a note to the viewer to remain focused on the â€Å"Once Upon a Time† mentality while watching the movie. This preface is another example of the intentional shift of focus away from the awareness of representation and towards a passive viewing experience. Later in the film, a mirror speaks to the protagonist: â€Å"I am your mirror, Belle.

Dell’s Strategic Management Plan Essay -- Computers, Business

Dell, Inc. got its start in 1984 when Michael Dell, a University of Texas student, began building computers for fellow students under the company name PCs Limited (Edwards, 2007). Within the next decade, Dell experienced phenomenal success by pursuing growth through catalog and corporate sales (Hunger, 2006). Dell made technology affordable and in doing so became a fierce competitor in the computer technology industry. However, the company’s disorganized structure could barely support their impressive growth. There are three specific measures of performance that I would have incorporated into Dell’s strategic management plan if I were leading Dell. Furthermore, I would include behavior and output controls in the control system to regulate organizational activities to ensure that they are consistent with company standards of performance. Dell, Inc. pursued an aggressive growth strategy which was met with equally aggressive customer demand. Dell delivered a quality product for a reasonable price and this value that Dell created for their customers was initially unmatched by rival computer companies. In fact, Dell saw this as an opportunity to expand their product line to include items such as printers and software. The company’s sales increased from $389 million in 1989 to $2.9 billion in 1993 (McGraw, 1994). However, the management structure did not grow with the company (McGraw, 1994). Financial results were not analyzed properly and the company was not being strategically managed (Hunger, 2006). Dell’s management team decided to slow their growth initiatives in part by eliminating retails sales of their products (Hunger, 2006). This decision created three distinct problems for the company. First, customers were unhappy that t... ...nagement (6th ed.). Mason, OH: South- Western Cengage Learning. Edwards, O. (2007, August). Baby Dell. Smithsonian, 38(5), 34-36. doi: 131320451 Hunger, D. J. (2006). Dell, Inc. In T. L. Wheelen & J. D. Hunger (12th ed.), Strategic management and business policy (pp. 31-1 – 31-5). Upper Saddle River, NJ: Prentice Hall. Matthews, J. R. (2011). Assessing organizational effectiveness: The role of performance measures. Library Quarterly, 81(1), 83-110. Retrieved from EBSCOhost. McGraw, D. (1994). The kid bytes back. U.S. News & World Report, 117(23), 70. Retrieved from EBSCOhost. Rogers, B. (2006). High performance is more than a dream - it's a culture. T + D, 60(1), 12. Retrieved from EBSCOhost. Wheelen, T. L., & Hunger, J. D. (2012). Strategic management and business policy: Toward global sustainability (13th ed.). Upper Saddle River, NJ: Prentice Hall.

Clinical Supervision in Counseling Essay

Professional competence is shown in many counselors throughout the world. One way that competence is displayed by counselors is their ability to utilize clinical supervision and consultation. Even long standing professionals in the field of counseling continually seek supervision. When confronted with difficult ethical decision making and unique situations in its best to gain an outside objective viewpoints. In reference to the case study, there are plenty of ethical dilemmas and unethical decisions made by Joe and his supervisor. It is clear their personal values differ from those who choose to follow ethical codes in counseling. The APA and ACA’s ethical standards and codes have certain relations in comparison to the violations which Joe and his supervisor have perpetrated. To avoid breaches of ethical codes, there are ACA ethics committee members to inform appropriate relationship standards with all individuals involved in the counseling process. Clinical supervision is important to utilize for each counselor’s self-awareness. The case study implies that Joe ended counseling sessions with Jill because they had mutual feelings of attraction towards each other. He made an ethical decision in doing so by recognizing the counseling relationship would be ineffective. Joe and Jill began a sexual relationship which ended abruptly after a month, with no physical or verbal contact afterwards. Joe had a guilty conscious of their unethical relationship. The imperative action he failed to do was follow through with the proper referral process by choosing to obtain clinical supervision from his supervisor for Jill’s well-being. However, Joe and his supervisor recently started a sexually relationship. He did not seek referral assistance for Jill to avoid hurt feelings from his supervisor. Inquiring the behaviors of both counselor and supervisor, there were evident breaches of ethics. The counselor and supervisor should have the knowledge that any non-professional relationship between the two is unethical and a breach of ethics. In other words, they should have known better. Teaching and modeling ethical and professional behavior is an important responsibility of a supervisor (Argosy, 2013). All psychologist, counselors and members of the ACES (The Association for Counselor Education and Supervision) must abide by the ACA and APA Code of Ethics. The ACES has developed ethical codes for counseling supervisors and is in accordance with the purpose of the ACA as well as a founding division of the ACA. According to ACES, the best practice guidelines are intended to support supervisors in their work. The ACES’s guidelines are offered to augment the judgment of supervisors as they make it their requirement to offer ethical and legal protection of rights of supervisors, supervisees and clients, and meet professional needs of supervisees while protecting client welfare (ACES, Best Practices in Supervision, 2010). With regards to ACES practice guidelines there are other exceptional tools or standards available to ensure supervisors know crucial standards for their practice. The American Counseling Association created a â€Å"Journal of Counseling Development†: Standards of Counseling Supervisors (ACA/ACES, 1990, JCD v69 n 1, Pg. 30, Vol. 69). † The standards implemented is this journal are important to counseling supervisors toS develop core areas of knowledge, competencies, and personal traits that characterize effective counselors. What happened between the counselor and the supervisor was extremely unacceptable. My values clash with their values. I am sure when I am counseling clients for mental health I will be attracted to a few men here and there. I may even be attracted to my supervisor or a colleague of mine. Physical or emotional attraction is a normal function as a human being, and is not a dangerous or awful thing. Making verbal or physical actions to distinctive attractions will not be the case for me. I would not want to jeopardize my career involving an unethical mistake concerning my attraction to one of my clients. I value the direction in which I am being educated, and I will value even more when I am certified and access a seemingly well respective job. Ethical standards and codes are needed to be taken very seriously. The APA and ACA have very similar codes of ethics and ethical standards. As I have stated before, Joe and his supervisor breached certain codes of ethics specifically pertaining to having a sexual relationship. According to the APA ethical standards it states, â€Å"Psychologists do not engage in sexual relationships with students or supervisees who are in their department, agency, or training center or over whom psychologists have or are likely to have evaluative authority (APA, 2010). One of the ACA Codes of Ethics involving relationships has boundaries regarding supervisory relationships. Logically, between current supervisees and their supervisor sexual and romantic interactions or relationships are prohibited (ACA, 2005). Within the APA and ACA ethical standards, they seem to have overall similar conclusion regarding sexual relationships between counselors and supervisors. One difference I recognized is that the APA states ethical ways of going about multiple relationships with clients, although it is best to refrain in case of impairment to the psychologist’s competency (APA, 2010). Also, The ACA has ethical standards involving potential ethical beneficial relationships with supervisees in a non–professional setting, such as attending a funeral for the supervisee. This has to be discussed between the supervisor and supervisee and documentation of the rationale for the relationship is a necessity (ACA, 2005). Members of the ACA and APA ethics committee have a huge responsibility to manage enforcement of the ethical codes concerning the APA or ACA and to enhance professional development through professions. Committee members have important obligations such as processing cases of alleged violations. However, a committee member cannot warrant the job review of any member affiliated or that is under the Code of Ethics. If I was an ACA Ethics Committee member, I would inform appropriate behavioral codes for counselors, especially new counselors to the field. I would certainly inform them of the no tolerance policies of sexual or intimate relations with co-workers or clients, as well as all ethical codes. I would make them aware of the role and function of what I do as a part of the committee. For example, we as a committee process complaints of ethical violations or alleged violations. Most importantly I would want to educate health professionals of the membership according to the ACA codes, and what the roles and functions of ethical committees. I would like to continue to adopt many values of ethical codes, ethical decision making, standards and principals for supervision that I highly appreciate.