Delegating for Growth Essay Example | Topics and Well Written Essays - 750 words

Delegating for Growth - Essay Example They fear loosing status, hence fail to assign high-profile jobs to their staff, and delegation of work is compromised, as the rookie manager is afraid of being resented by his peers (Walker, 2002, p.4). Secondly, rookie managers tend to depend highly on their bosses; this is usually a sign of disaster, since the new mangers will not learn to do his duties on his own. However, setting up brief meetings with their bosses may be of help to the new managers. In addition, lack of confidence contributes to a manager’s failure to inspire their team. These managers face the challenge of addressing their staff members. Other than addressing the problem faced by their staff, they sit back hoping things will improve, whilst the other staff members become frustrated by their lack of actions. Lack of experience from managers compromises the efforts of addressing a problem that is affecting the organization and the team as well (Walker, 2002, p.7). Therefore, there is need to train the roo kie managers on managerial skills so as to ensure that they understand their new roles, hence delivering effectively. Supporting arguments. Delegation of duties is a function of a manager. Walker (p 4) insists that a rookie manager needs to understand that his new role has nothing to do with personal achievement; instead, it entails building his staff members. However, these rookie managers tend to have insecurities especially when assigning duties to their staff members, as they fear that the employees may outdo them. Therefore, managerial skills are very important, as they enable the new managers to understand their roles; these managers need training and coaching to enable them deliver. The new managers need to be trained on how to delegate tasks effectively, hence enabling them to develop talented staffs that are an advantage to the company. Therefore, the managers will not be insecure about assigning duties effectively without prejudice. Supporting the new managers is necessary . When rookie managers are supported by their bosses, work life becomes easier; however, the kind of support given may be at a disadvantage, for instance, heavy reliance on their bosses could render them reluctant. Walker (p5) insists that managers should only consult their bosses on critical issues, but not on the nitty-gritty ones. Brief meetings between the bosses and the managers are necessary, whereby, the new manager can ask questions and receive feedback on the pressing issues. The new manager is then able to organize his thoughts on how to deal with his staff members. In addition, a manager should be capable of projecting confidence to enable him inspire the team members This is due to the rapid changing technology that requires every manager to be updated and capable of dealing with challenging issues; failure to this leads to stress in the place of work. The ability to deal with arising problems by addressing them other than watching and ignoring the situation is paramount for a manager. Employees gain confidence in a manager who addresses the problems affecting them and certainly puts the matter to rest, thus giving employees the will to perform. Bruch & Ghoshal (p5) add that, managers are not expected to do the inevitable; however, focused managers respond immediately to any arising issue that interferes with the organizational goals. It is however important for the managers to adopt managerial skills before being

Responsibility not a Sufficient Condition of Liability Essay Example for Free

Responsibility not a Sufficient Condition of Liability Essay Introduction Duff = â€Å"responsibility is a necessary but not a sufficient condition of liability† An actor is responsible when they are sufficiently blameworthy in causing the harm or committing the wrong = we blame those who have control over their actions (committing a crime is a mental process) * MR is the guilty mind. Note that it is not necessarily a moral/culpable judgment, and there can be involuntary MR e.g. drugged paedophile in Kingston. * There are many MR states of mind: the sentencing advisory panel stated that there are 4 levels of culpability = intent, recklessness, knowledge, and negligence [in some crimes only negligence is required * Two species of MR Cognitive (involves intention or foresight by D) and Normative (evaluation of D action taking into account surrounding circumstance and D state of mind) * Proof of Cognitive = subjective test (assume state of mind is ascertainable only direct evidence is a confession) – jury ascertain reasonable person but destroy subjectivity * DPP v Smith = D trying to escape from the police in a car was signalled to stop. He did not do so. A PC jumped onto the cars bonnet. D drove at high speed, swerving from side to side, until the officer was thrown off and killed. = CJA S8 – endorses the idea that intention is to be subjectively ascertained Intention Some crimes are only committed intentionally so must distinguish from recklessness e.g. GBH * Direct intent – It was D’s purpose/aim/objective to bring about the AR. Duff = test of failure – would D intend their actions to be a failure * Oblique intent – The AR was a necessary by-product of D committing his offence, although it was not his purpose. * Intent is a subjective concept and must be judged according to what D wanted to happen or foresaw happening (s.8 Criminal Justice Act 1967 = lays down evidential rule as to how intention is to be proved and makes it clear that intention is a subjective state of mind = court or jury must draw inferences from all relevant evidence): * D will intend something if it  was his purpose to bring it about. Similarly, a jury may use as evidence of intention that D foresaw the result of his act as a virtual certainty and it was a virtual certainty. (Woollin, which affirmed the test in Nedrick) * Nedrick = D poured paraffin through C letter box and set light to it. A child died in the fire. The judge directed the jury as follows: If when the accused performed the act of setting fire to the house, he knew that it was highly probable that the act would result in serious bodily injury to somebody inside the house, even though he did not desire it desire to bring that result about he is guilty or murder. â€Å"The jury convicted of murder and the defendant appealed on the grounds of a mis-direction. Held: There was a clear misdirection. The Court of Appeal reviewed the cases of Maloney and Hancock Shankland and formulated a new direction from the two decisions. Lord Lane CJ: the jury should be directed that they are not entitled to infer the necessary intention, unless they feel sure that death or serious bodily harm was a virtual certainty (barring some unforeseen intervention) as a result of the defendants actions and that the defendant appreciated that such was the case. * Woolin D threw his crying child at the cot but missed and he hit his head and died. This was the exact opposite of what D intended. Judge misdirected jury by saying that intention could be inferred from D’s realisation of a ‘substantial risk’. = Where the charge is murder and in the rare cases where the simple direction is not enough, the jury should be directed that they are not entitled to find the necessary intention, unless they feel sure that death or serious bodily harm was a virtual certainty (barring some unforeseen intervention) as a result of the defendants actions and that the defendant appreciated that such was the case. The decision is one for the jury to be reached upon a consideration of all the evidence. * Lord Bridge disagrees with the leniency of the Woollin definition. He uses the example of a man who boards a plane to Manchester – the plane’s arrival in Manchester is a virtual certainty and so it should be seen as conclusive pr oof of intent to go there. Woollin is more generous. * Exceptional cases : oblique intention – D has a purpose other than causing the prohibited harm but where that result is an inevitable or likely consequence – in rare cases it is permissible / central problem is that  there are 2 possible interpretations of Woollin * Definitional interpretation = extended definition of intention – if a consequence is foreseen as virtually certain the jury may be told that this amounts to intention * Evidential interpretation = still no definition of intention where a consequence is foreseen as virtually certain this is evidence entitling a court or jury to find intention – jury has discretion * Evidential adopted = Matthews and Alleyn = Ds who had tossed a half dead V off a bridge who they knew couldn’t swim appealed. Claimed the judge misdirected because he equated the knowledge of virtual certainty to proof of intent, not just evidence. Rix LJ couldn’t see the difference. * Adv. of evidential = gives jury flexibility = jury given moral elbow room (get out clause) * R v Steane = D British radio announcer who was living in Germany during WWII. With his family under threat he was forced to broadcast on the radio for the Nazis. After the war charged with doing acts likely to help the enemy with the intent to assist the enemy. If this case was decided today under evidential the jury would have moral elbow room to find there was no intent * RE A (conjoined twins)= lawful for doctors to separate conjoined twins even though would leave to certain death of the weaker twin LJ Walker = allowed himself moral elbow room as doctors would not intend to kill the weaker twin because that was not the purpose or intention of the surgery * Is intention a psychological state of mind or a moral conclusion = the doctor would not be morally responsible for the death * Does intention have same meaning for all crimes Woollin is the latest case so is the authority but only talking about murder – therefore use Nedrick for all other crimes – but no other authority so use Woollin * The Law Commission support codifying the Woollin test in statute. Proposed definition of intention * Chandler v DPP = D opposed to nuclear weapons so planned non-violent action to immobilise an aircraft – under evidential interpretation the jury would be able to evaluate the motives of D but this may largely depend on political persuasion of the jury so generates uncertainty and inconsistency and would also blur the distinction between the elements of an offence and exculpatory defences Pedain – Intent and the Terrorist Example * The terrorist example is used to show flaws in the definition of intent.  It assumes that a terrorist wants to gain attention by planting a bomb in a public place, but giving enough warning that he thinks the place can be evacuated in enough time. It is, but a member of the bomb disposal squad is killed when trying to disarm the bomb. He may not have foreseen this death, and if he didn’t he isn’t guilty of murder. Many see this as unacceptable. * German law involved D recognising and reconciling with himself the risk that he is exposing people to and liability follows. * The other example is the terrorist who does want the bomb to explode but gets caught and then the bomb disposal person dies. He doesn’t intend to kill the bomb disposal expert. But Pedain says this shouldn’t matter – it is still murder. Can we use a ‘type of harm/transferred malice’ argument. Kaveny – Inferring Intention from Foresight * Two opposing views: one recognises that foresight is conceptually different from intention but that a jury may infer one from the other, and the other that foresight is form of intention. * Neither is acceptable because no degree of foresight can be defined as intention, nor can it be the basis of any reliable finding of intention – so neither view is acceptable. * Thus if we are going to allow foresight to be a basis for a murder charge, it has to be built in as a separate mens rea element instead of using Woollin. Recklessness Regarded as sufficiently blameworthy Until October 2003 there were 2 distinct species of recklessness * 1 = Cunningham recklessness a subjective meaning of recklessness was approved (Recklessness entails a conscious running of an unjustifiable risk) * Stephenson = tramp started fire in a straw stack on a farm – charged under criminal damage act but evidence made by psychiatrist that D suffered from schizophrenia so no subjective foresight [under subjectivity the definition of recklessness lies down a double test 1)whether D foresaw the possibility of consequences /2)whether it was unreasonable to take the risk ] * The law commission in the draft criminal law bill 1993 and the draft offences against the person bill 1998 has endorsed subjectivity * 2= Caldwell / Lawrence recklessness [in 1981 the direction of the HoL changed  due to their verdicts in 2 cases dramatically according to the first part of the test of foreseeability of consequences it was now objective] * Caldwell = D had done some work for the owner of a hotel and as a result of quarrel, got drunk and set fire to the hotel, D argued it did not occur to him that there might be people there whose lives might be endangered. None of the 10 guests were harmed Held: Recklessness in the context of Criminal Damage does not require subjective appreciation of the risk of causing damage, but is also satisfied by a failure to consider an obvious risk. HoL held a person is reckless if 1) he does an act which leads to an obvious risk 2) when does an act which either a) gave no thought to the possibility of the consequences b) did recognise consequences [pretty much a test of negligence] The risk need only be obvious in the sense that it would have been obvious to the reasonable man, not to the accused if he or she had stopped to think Elliott v C nor to a person of the age of the accused or sharing the accused’s characteristics R (Stephen Malcolm) ; R v Miller These cases were confirmed and followed in R v Coles * Lawrence = D drove his motorcycle on a 30mph road at about 80mph, and killed a pedestrian who was crossing the road./Lord Diplock = the defendant was in fact driving the vehicle in such a manner as to create an obvious and serious risk †¦ and, second, that in driving in that manner the defendant did so without having given any thought to the possibility of there being any such risk or, having recognised that there was some risk involved, had none the less gone on to take it. * Lacuna (gap) in the law of recklessness as above test does not take into account if D stops to think whether there is a risk and then concludes there is no risk and consequently acts * Avon v Shimmen = D thought he had ruled out the risk of causing damage to a window when he aimed a martial-art-style kick in its direction, basing his view on his faith in his own skill. [the risk must be obvious but to whom a reasonable person or D if they think about it] * Elliott V C = A fourteen-year-old girl who had learning difficulties set fire to shed – use objective test and learning difficulty irrelevant The court accepted that she could not appreciate the risk of the damage, but such a risk would have been obvious to the ordinary person and Caldwell was applied * Current  test for recklessness: D believes his conduct will result in a risk of harm, and that risk is not a reasonable one to take but he takes it (from Cunningham and reaffirmed in G and Another) * Cunningham – D pulled a gas meter off a wall in order to gain illegal access to a house. It caused a gas leak and V was poisoned. No recklessness because risk was not foreseen. * The test is subjective: there can be no liability where there is no risk foreseen. * G and Another – two boys set fire to some papers underneath a bin, which then spread and caused  £1m worth of property damage. They didn’t foresee the risk and so they could not be liable – no recklessness. * HoL = Caldwell was disproved not overruled and Cunningham approved, so D was acquitted as didn’t know the risk involved / Lord Bingham = 1) for serious crimes you need to prove culpable state of mind = not thinking about risk is not blameworthy just stupid / 2) Caldwell leads to obvious unfairness- neither moral or just to convict based on what someone else would have apprehended /3) about 80% of academics, judges and practitioners criticised Caldwell / 4) most importantly Caldwell misinterpreted s1 criminal damages act * Unanimous decision by HoL adopts the Cunningham view that recklessness involves foresight of the possibility of an unjustified risk ‘ but 3 further points * Lord Steyn = â€Å"if a D closes his mind to a risk he must realise that there is a risk† = Booth v Cps = D ran across the road without looking (deliberately put risk out of his mind but was aware) * Lord Bingham = exempted self-induced intoxication * Lord Bingham = restricts his judgment to the meaning of recklessness in the criminal damage act / Lord Rodger = Caldwell may be better suited to some offences than to others e.g. reckless driving * Note that in crimes where we are only concerned with D’s behaviour we may think of recklessness as an AR element – reckless driving. It is possible to intend to drive reckless * Negligence Unlike intention and recklessness, negligence is a totally objective standard – the risk is not a perceived/foreseen one. 2 degrees of negligence Simple negligence = failing to confirm Gross negligence = major departure of reasonable person – manslaughter Whether negligence is a form of MR is debateable, because the literal translation is that of the ‘guilty mind’. Cognitive = negligence is a state of mind, it is a failure to think so a blank state of mind but like saying nothing is something (how can you have a degree of emptiness) Normative = when finding judgments of blameworthiness , state of mind is part of the picture / D actions in the circumstances are subjected to a broader moral assessment = legitimate that negligence is part of MR – sentencing advisory panel also regard If D has special knowledge (e.g. is a firearms expert) then a higher standard will likely be expected of him. This is given statutory expression in RTA 1998 s.2A(3). On the other hand, less knowledge will not grant D any dispensation (e.g. learner driver must drive at same level as qualified driver). â€Å"knew or ought to have known† imposes that objective standard where special knowledge is included but limited is not. R v C – paranoid schizophrenic appealed a conviction on the basis that the judge should have directed the jury to take his mental illness into account. Not so. Negligence is an objective test and mental illness is irrelevant. Sometimes we are willing to lower the standard of care, for example for children – R (RSPCA) v C (25 year old child who failed to take her cat to a vet). Few serious crimes where negligence can generate liability. Manslaughter, causing or allowing a child to die, public nuisance. Manslaughter requires gross negligence. but change in the past 30 years for statutory offences Road Traffic Act 1998 s.3 is a crime of negligence. Other offences where negligence is an element include Sexual offences act 2003 s.9. = no exemption if believed there was consent , need to reasonably believe not honestly believe Are there degrees of negligence? From a mens rea perspective, there cannot be. But there has to be – falling just short of a standard and well below it. This is demonstrated by contrasting but similar offences in RTA 1998 S.2A and S.3. This may be to do with risk to property v risk to people? Contrast with Adomako, the jury must be required to find a degree of ‘badness’, for manslaughter is a serious crime. Perhaps the degree is less  relevant in simple road traffic cases. Should negligence be a ground of liability? Many believe negligence has no place in criminal liability.  The criminal law is viewed as a reaction to moral fault. Whether there is any sort of moral fault involved in negligent conduct is much debateable (Hall). Punishments for negligence do not deter (negligence is inadvertent) and, also, punishments for negligent homicide tend to be quite light anyway. (Hall). Some disagree – Brett points out that drivers become more careful when there is police presence on the road. Hart supported a more subjectivist approach, taking into account mental and physical capabilities [characteristics and capacity should be taken into account] The law commissioner similarly endorsed in relation to gross negligence for the purpose of negligence Hybrid offences = some countries have due diligence laws, which replace strict liability with negligence. D committed the AR, but if he took all reasonable steps to prevent it, he may avoid liability [burden shifts to D to prove they were not negligent e.g. if found with drugs proving you thought it was something else]. English courts have been disinclined to use this method (although Sweet v Parsley looked favourably upon it). Hall suggests limiting insurance protection for those civilly negligent, more vigorous controls of licenses e.g. driving, and education etc.

Materials Selection For Automotive Exhaust System Engineering Essay

Materials Selection For Automotive Exhaust System Engineering Essay This assignment looks into the material selection and manufacturing process for an automotive exhaust system considering the operational requirements. Towards the end, the application of alternate material is also discussed. Working Requirements The maximum temperature in an automobile exhaust system is around 750-850 degree celsius. So the selected material for manufacturing the exhaust system should be able to handle temperatures in this range. Also there are various other corrosion factors like high temperature oxidation, de-icing salt contamination and wet corrosion by condensates[mainly towards the tail pipe section]. The exhaust system can mainly be divided into 2 sections based on the working temperature. The hot end[temperatures above 600 degree Celsius] which starts from the manifold till the catalytic converter, and the cold end[temperatures below 600 degree Celsius] which extends from the pre-muffler till the tail pipe. The exhaust system is also subjected to high frequency vibrations due to exhaust gas discharge. Normally, ferrous alloys are used in the manufacturing of exhaust system. These include carbon steel, stainless steel, alloy steels and cast iron. The purpose of adding alloying elements is to help in solid solution strengthening of ferrite, improve the corrosion resistance and other characteristics and the cause the precipitation of alloy carbides. [5] Mild carbon steel was extensively used for the manufacturing of exhaust systems for a considerable period of time. Although mild steel has the properties to withstand exhaust temperature it has very poor corrosion resistance. High exposure to road salt and exhaust condensate can terribly shorten the life span of a mild steel based exhaust system. Also, over the years higher demands in power and environmental safety have seen the demise of mild steel from exhaust systems. Nowadays mild steel is employed in applications where the environment is non-corrosive. Stainless steel has replaced mild steel in exhaust systems today. The ferrous alloying element used here is chromium. The minimum amount of chromium in stainless steel is 10.5%. When stainless steel is heated, chromium forms a protective layer of chromium oxide over the stainless steel surface and delays further oxidation process. The exhaust system in a vehicle is expected to be at its peak performance always and the material failure is a undesirable characteristic for this. Performance and efficiency of a automobile engine is seriously affected by minor changes in the exhaust system. Therefore, it is important that fail proof and efficient materials be used in the construction of automotive exhausts. Materials used for manufacturing of exhaust systems should have the following characteristics: High service temperature, high fatigue strength, high fracture toughness, should be easily machinable and should be economic considering the overall cost of the automobile. Also, the material should be highly resistive to corrosion as the exhaust system is majorly exposed to road salts and condensates from the engine exhaust gases. Failure in the exhaust system can cause loss of back pressure which can significantly affect engine performance parameters.[1] Current trend: Evolution in the automobile industry has also seen the evolution of exhaust systems. From the usual carbon steel exhausts, we can see stainless steel being heavily employed in exhaust systems. From the CES charts, we can see that stainless steel excels over low/medium carbon steel in all properties other than economy. Ferritic stainless steel is used in the manufacture of exhaust systems. Ferritic stainless steel contains chromium as the main alloying element. The percentage of chromium can vary from 10.5% to 18%. These materials are resistant to corrosion and have very low fabrication characteristics. Although, these can be improved by alloying. Grades such as 434 and 444 have improved fabrication properties. Ferritic stainless steel is always used in a annealed state as they cannot be hardened using heat treatment processes. They have vey high resistance to cracking due to stress corrosion. They also exhibit acceptable welding characteristics in thin sections.[1] We can see in detail the different parts of the exhaust system and the material properties below: Exhaust Manifold: The exhaust manifold of a automobile engine is always exposed to hot gases. Cast iron has been in use for the production of exhaust manifolds traditionally. The main characteristics required for the exhaust manifold material include thermal fatigue strength required to withstand the high temperature exhaust gases, oxidation resistance , good fabrication properties and low thermal capacity to enhance the catalytic function. Ferritic stainless steel exhibit all these properties and offers big weight reduction also. The developments in vacuum casting process has helped in the fabrication of stainless steel manifold with section thickness of 2-5mm. Higher demands in pollution control will rise the exhaust temperatures too and therefore, ferritic stainless steel will be in major use for exhaust system manufacturing. Ferritic stainless steel exhibits improves thermal fatigue characteristics when processed by solid solution strengthening with molybdenum or niobium. This process also improve s the oxidation resistance and microstructural stability. Ferritic stainless steel also has cost advantages because of the absence of nickel in its composition. Another variant called the austenite stainless steel is used where ferritic stainless steel is unsuitable. Austenite stainless steel can enhance its properties when enough carbon is added to it. But, the higher cost limits its usage compared to the ferritic variant.[3] Cast iron manifolds can be manufactured by the sand casting process. The solidification of molten cast iron can result in the formation of interstitial voids between the various particles in the cast iron structure. This can lead to particle sliding over each other and as a result a decline in the mechanical properties of the mould. Stress relieving heat treatments are performed inorder to increase the dimensional stability of the material. During heat treatment, the thermal expansion of the material allows the voids to be filled. Although, care should be taken as not to overdo the heat treatment process as too much thermal expansion can bring about more stresses in the material microstructure and this can impair material properties. Changes in microstructure can diminish material properties like thermal fatigue and fracture toughness that can result in the premature failure of the finished product. The alternate material that can be used in exhaust manifold manufacture is ferritic stainless steel. These materials have enhanced properties for exhaust manifold production. The main feature is the low thermal expansion that is one of the major problems faced by cast iron exhaust manifolds. Molybdenum and Niobium alloying has shown tremendous increase in the heat enhancement properties of ferritic stainless steel. Vacuum casting process that is used in the production of ferritic stainless steel manifolds is the factor that increases its cost. Effective methods need to be developed to reduce the tooling and manufacturing cost. Once this is achieved, cast iron exhaust manifolds can be replaced by stainless steel exhaust manifolds that have improved properties and weigh less and can thus adhere to stringent emission norms that come in future. Nowadays stainless steel manifolds are only used in vehicles that call for extreme performance. Commercialisation of this technology is not far a way. Catalytic converter: The catalytic converter is used to clean the exhaust gases and make it free of toxic effects. It is normally exposed to elevated temperatures like 1000 degree Celsius and therefore its durability is a very important factor in proper functioning of the exhaust system. Conventionally the catalytic converters are made of a material called the cordierite monolith that basically acts as the absorbant in it. Cordierite is a silicate and thus the component is manufactured by an extrusion process. Then it is subjected to washcoating where the monolith is submerged in materials such as Al2O3, CeO2, ZrO2 and metals such as platinum, rhodium and palladium. The main properties of the catalytic converter monolith are as follows Fusion point : 1450 degree Celsius Coefficient of Thermal Expansion : 0.002cal/s-cm-oC [low] Thickness of monolith walls : 100 microns Number of cells : 400-900 cpsi The main advantages of the cordierite monolith are lower cost and manufacturing ease. Alternate material for the catalytic converter is stainless steel. Instead of the silicate monolith metal alloy materials are used in the construction of the monolith. These metal monoliths are manufactured by the combination of flat and corrugated layers of the metal alloy. These are then made into the spiral shaped monolith. The exhaust gases escape through the channels formed between the flat and corrugated planes. Washcoating is done in this case also. But the important thing to be remembered is that this process needs to be done before the monolith is made into a spiral shape. This is because the metal monolith is generally smaller in size and that can obstruct the proper washcoating of the entire metallic monolith. The main characteristics of the metallicmonolith are as follows: Fusion point : 1600 degree Celsius [150 degree Celsius more than cordierite] Coefficient of Thermal Expansion : very high[directly influenced by aluminium content in metal alloy] Thickness of monolith walls : 25 microns [less compared to cordierite] Number of cells : 800-1250 cpsi [2] One of the major advantages of the metallic monolith is the high impact resistance. As the catalytic converter is prone to impacts from road surfaces, it is important that the catalytic converter remains intact at all times. The cordierite monolith is very weak compared to metallic monolith in this case. Metallic monoliths also have the advantage of being placed close to the exhaust manifold. This means that they can achieve the operating temperature[around 300 degree Celsius] earlier and thus reduce exhaust contamination. These monoliths can also be developed in smaller sizes compared to the silicate counterparts. Higher service temperature means that metallic monoliths are used in high performance applications where the conditions are very severe. Muffler : The muffler is the final part in the exhaust system. The introduction of catalytic converter has led to the formation of condensates inside the muffler thereby resulting in corrosion. Aluminized carbon steel is employed in the manufacture of the exhaust mufflers traditionally. The exhaust gas condensates have amplified the corrosion rates in the muffler and it is seen that they do not perform to their maximum service life when the catalytic converter is introduced. This normally happens in the short runs of the vehicle where the exhaust gas temperature does not rise high enough to vaporize these condensates. During long runs, the exhaust gas temperature goes over 100 degree Celsius which prevents the formation of condensates and reduces corrosion. Stainless steel mufflers have very high corrosion resistance and the addition of chromium and molybdenum can improve these properties. High production rates can be achieved by the use of stainless steel by tandem mill cold rolling, annealin g and descaling process. Titanium can also be added in small traces to improve muffler properties in stainless steel.[3] Titanium exhaust systems [ a future perspective]: Environmental agencies now prefer guaranteed corrosion resistance on exhaust systems for more than 100,000 miles. Titanium achieves this and is much better than stainless steel systems that are used now. A typical catalytic converter and muffler pipe in stainless steel weighs around 10kg. A redesigned titanium system weighs only around 3.2 kg. This weight saving is very beneficial when considering high performance and high precision automobiles. Pure titanium tube and sheet are the materials of choice for silencers, and pipes. Reduction of weight and cost are achieved by selecting the thinnest gauges of materials consistent with the engineering and acoustic parameters of the exhaust system. Titanium may not be suitable for the entire system, and will most probably be limited to components in which the temperature of metal does not go over 400 degree celsius for longer periods of time. The parts immediately behind the catalytic converter continue to perform well under test. Use of titanium lugs welded to the pipe will certainly prove to be the most efficient method to fix the exhaust to the vehicle frame (via rubber isolators). Material conforming to ASTM Grade 2, (e.g. Timetal 50A) offers the optimum in terms of cost, availability, fabricability, weldability and mechanical properties. Grade 45A is slightly less strong and more ductile than 50A and may be required where extensive forming is part of the manufacturing process e.g. lock seaming (Table 4). Both alloys are fully weldable, require no intermediate or post-forming heat treatment, and are available in wide sheet coil. These alloys are also used to manufacture low-cost continuously welded tube.   Properties of pure titanium 45A and 50A 45A 50A Thermal expansion (10-6degree Celsius) 8.9 8.9 Hardness (HV) 140-170 160-200 Tensile Modulus ( 103N.mm2) 103 103 Density ( g.cm-3) 4.51 4.51 Specific Heat( J.kg-1.oC-1) 519 519 RA min (%) 40 35 Titanium Production: Pure titanium is cold formable, and sheets or tube can be shaped readily at room temperature using techniques and equipment that are normally for steel. Following factors must be taken into consideration while machining titanium.  ·Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  The ductility of titanium is generally less than that of steel. More generous bend radii may be required during bending applications.  ·Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  The modulus of elasticity of titanium is about half that of steel. This means that titanium will return back to original state after forming. Compensation for this can be done by slight overforming.  ·Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Titanium tends to gall against unlubricated forming tools. Proper lubrication of the tool can solve this problem. Both lock seaming and resistance welding are suitable to join the catalytic converter, and traditional TIG is suitable to seal the ends and pipe joints with a torch trailing shield to the external surface of the box end joints. Production Economy: A leading exhaust system manufacturer in the United States, successfully rolled and seam welded a batch of titanium boxes at one of its production units. This was done with no extra cost when compared with the production of steel components. It was also seen that the bending units that are currently employed for the bending of steel are suitable in the case of titanium also. The only factor is the procurement cost of titanium and therefore significant efforts are necessary to bring down tooling and manufacturing costs.[3] Conclusion: It can be concluded that stainless steel can replace conventional materials in automotive exhaust systems. We have to count on developments in tooling and manufacturing methods that can bring down overall costs to minimum. Stainless steel is easily the best alternative in service aspects of the exhaust system. High performance materials like titanium may also come into commercial production soon. Improved thermal, mechanical and chemical properties are major factors that govern material selection for an exhaust system.

Integrating Women into the World Economy Essay -- Economics Females E

Integrating Women into the World Economy Introduction On November 9, 1989, the world’s economy changed dramatically. The fall of the Berlin wall produced a new world order which enabled states to connect on political, economic, and social levels with nations that were previously inaccessible to the western world. This created an interaction across national boundaries. The past two decades have seen the growing economic interdependence of countries worldwide, including an increased volume of cross-border transactions of goods and services, international capital flows, and most importantly, the rapid and widespread diffusion of technology (â€Å"Economic and Social Survey of Asia and the Pacific, 1999†). The airplane hijackings in America on September 11, 2001 further proved that the world had changed. From that day forward, all nations possessed the abilities to play a role in outsourcing and technology sharing. New York Times columnist Thomas Friedman illustrated this point in the book â€Å"The World Is Flat† when he stated that economic power sources are no longer monopolized by prosperous developed nations, but instead by a flattened, equal playing field for all countries. There are numerous illustrations used by Friedman, including the fact that â€Å"all the world’s computer parts come from the same supply chain that runs from Korea, down through coastal China, over to Taiwan and down to Malaysia† (Friedman). With the influx of development in the global arena, opportunities for jobs and sustainability have also increased, especially in developing nations with resources to contribute to global production. Such positions and opportunities have been filled mainly by citizens who have been granted educational opportuniti... ...nomics. United Nations Development Fund for Women. 23 April 2007 â€Å"Regional Symposium on Gender Mainstreaming into Economic Policies.† 28-30 January 2004. United Nations Economic Commission for Europe. â€Å"The United Nations Fourth World Conference on Women.† September 2005. Beijing Platform for Action. 20 April 2007. â€Å"What Are the Millennium Development Goals?† 2005. UN Development Goals. 20 April 2007. â€Å"Women and the Economy.† UNFPA: Working to Empower Women. 23 April 2007. - Women and the Economy.htm>

Whistling Vivaldi

The book gets its title from a story a black New York Times writer, Brent Staples, told Steele about how he ad to whistle Vivaldi anytime he walked on the streets of Hyde Park a suburb of Chicago so he wouldn't look violent to the dominantly white people who lived on that part. Staples who knew he had a social identity because he was black used the whistling to steer through that part of his daily life.Identity contingencies are the things you have to deal with in a situation because you have a given social identity. Stereotype threat in the book, from my understanding can thus be defined as when a person finds himself/herself in situation or circumstance where his or her performance/behavior consciously or unconsciously is affected usually by negative stereotypes.A typical example was the Golf experiment in the book where Jeff stone and his team using typical stereotypes about whites been less naturally athletic than blacks and blacks been less intelligent than whites as the experim ental variables was able to prove how the performance of the white students at Princeton University was reduced when they were told they were been tested or their natural athletic ability and how the same thing happened to the black students when they were told they were been tested for their sports strategic intelligence.The 2nd experiment Steele describes was the experiment in which a third grade teacher Jane Elliot trying to teach her students the importance of the life and works of Dry Martin Luther King identified eye color as the basis Of been smarter, cleaner and been well behaved. This experiment exemplified how an identity and stereotype affects a person's way of thinking and ability.

Word Lab 2 Ch 3

————————————————- Jonner Public Library Jonner Public Library 4992 Surrey Court, Jonner, MA 02198 ? 291-555-9454 ? Web Address: www. jpl. net March 10, 2012 Mr. Brent Jackson 5153 Anlyn Drive Jonner, MA 02198 Dear Mr. Jackson: Thank you for registering online for our spring classes. As a library patron, you are aware that we offer a great deal more than books and magazines. The table below outlines the classes for which you have registered, along with the dates and locations: Class| Date| Location|Intro to Windows 7| April 10| Room 10B| eBay Basics| April 18| Room 24C| Genealogy Searches| April 24| Room 10B| Overview of Office 2010| April 28| Room 22A| Note that all classes, regardless of date, begin at 10:00 a. m. and last four hours. Although no materials or textbooks are required for the classes, you are strongly encouraged to bring the following items: * Pens, pencils, or other writing implements * Blank CD or DVD to store documents and notes created during class * Notebook or loose-leaf binder for handwritten notes Your valid library card to verify enrollment eligibility Please note that no food or drinks are allowed in any of our computer facilities. If you have any questions or would like to register for additional courses, please contact me at (291) 555-9454 or via e-mail at [email  protected] net. Again, thank you for your interest in and continued patronage of Jonner Public Library. We look forward to seeing you when your first class begins. Sincerely, Marcia Lawrence Head Librarian