The importance of having enough knowledge about Testing Essay

The importance of having enough knowledge about Testing - Essay Example For this purpose, second language teachers must not only possess adequate knowledge of regarding appropriately ‘testing’ their students but also must have On the basis of my extensive research on the subject, I can safely state that ‘bilingualism’ and ‘testing’ are closely related – particularly in terms of second language studies. The accurate evaluation of a student’s performance entails the adoption of an appropriate method of testing. In the absence of such an awareness, the instructors may not be able to develop an effective test. There are various types of testing or assessment procedures. While evaluating the progress of a student in a certain skill, the teacher must develop an effective method of testing which is both reliable as well as valid.I lacked adequate knowledge regarding such crucial issues as ‘assessment’ and ‘testing’, and my experience as a second language teacher at various schools as well as at a university failed to offer the much-needed guidance and awareness on such issues. I encountered various difficulties in testing different levels of students. However, after participating in this course and the Practicum course, my knowledge and understanding of these crucial concepts have widened and helped me in appropriately evaluating the performance of my students irrespective of their levels. I strongly recommend this course to all the second language teachers who have too often deal with bilingualism and testing.

Bleeding Kansas Leading to Civil War Research Paper - 1

Bleeding Kansas Leading to Civil War - Research Paper Example There are several events that resulted into the secession which finally led to the civil war in America. 2Progressively, there are several events that finally broke the civil war and Americans found themselves in the fight. They include; The Mexican war of 1848, fugitive slave act of 1850, the release of Uncle Tom’s cabin, Bleeding Kansas, attack of Charles Summer, the decision by Dred Scott, rejection of the Lecompton constitution, Harper’s Ferry Raid by Brown, Election of the Abraham Lincoln as the president of the U.S. However, it is important to note that Kansas-Nebraska Act was one of the most instrumental events that led to civil war. This paper has therefore outlined the events that took place at the moment when the act was passed as well as ho it resulted into the civil wars. This act gave the Kansas and the Nebraska the opportunities to decide for themselves what they wanted to take place. They were given the opportunity to decide for themselves whether they wanted to sop slavery or whether they wanted to continue with the slavery activities. As a result of this, there were divisions in the minds of individuals in these states. As a result, there was a clear battle line between the pro and the anti-slavery idea. These wars therefore became some of the events in the war that finally led to the civil war in the United States of America. Bleeding Kansas is therefore a term that refers to the different and consequential violent activities that took place in several parts of the Kansas state. 3The violent activities were mainly between those who supported the slavery and those who were against the slavery. It is important to note that this was a civil war of its own because the government had already passed legislation for the people to choose what was good or bad for them. These events took place between the years 1854 and 1858 and resulted into several issues that were difficult to resolve at that time and hence there was increasing

The Hounds of the Baskervilles Essay Example for Free

The Hounds of the Baskervilles Essay Dr Watson is Sherlocks companion which was common in those days. He is a middle class citizen and is polite and formal. He retired from the Army and is now living on his Army pension. He admires Holmes and looks up to him, this is evident as he wants Sherlocks approval Has anything escaped me? . Sherlock sees Watson not as an equal but someone who he can patronise which is apparent when Watson is analysing a scene most of your conclusions were erroneous and you are not yourself luminous. This is caused by the differences in classes. However Watson (when not needed by Sherlock) spends his day at a Gentlemens club that he belongs to, which was a common way for men to entertain themselves in the Victorian times. As he can afford to join the club then he must be comfortable financially, nevertheless not as wealthy as Holmes. Watsons wealth is also obvious as Watson smokes cigarettes which are bought from the same expensive shop as Holmess tobacco in Oxford Street. Watson (like most Victorian Men) has strict beliefs in what is right and wrong and how to behave. This is seen when he comes across an unarmed suspect whom he has a chance to shoot, however he refuses to because he says he only has the gun to defend himself and not to shoot an unarmed man. Sir Henry Baskerville is a titled aristocracy who inherits Baskerville Hall but has to return to England from America. His appearance is seen as different to other upper class men as he has the .. weather beaten look of a man who is unused to the English countryside which is very formal compared to America and Canada which is where he spent most of his life I have got a little careless in my ways out West. However he is still referred to as an upper class gentleman. He appears uncomfortable to the strict opinion of the community in Victorian England however knows he has to behave in an appropriate way. Sir Henry is amazed when he first sees Baskerville Hall To think that this should be the same hall in which for five hundred years my people have lived! It strikes me solemn to think of it. In this Era it was extremely popular for big houses to be passed down by generations of the same family. In the Victorian times Servants were extremely popular in the upper class households. The amount of servants per household depended on the size of the house and their wealth. Within the bigger houses the servants who usually lived in the house would be arranged into a hierarchy of servants with the butler (male) at the top (which is ironic as this reflects the patriarchal system of Victorian England). In Baskervilles hall, Mr Barrymore is the butler subdued manner of a well-trained servant and Mrs Barrymore is the housekeeper large, impassive, heavy featured. Commonly in those days the servants would stay with the family for years and show great respect and loyalty. Sometimes servants would work in the same households as their relatives, Mrs Barrymore and her brother were bought up in Baskerville Hall. Frequently the servants children would grow up in the household too and would start working there at a young age. However when Mrs Barrymore is told of her brothers death, Mr and Mrs Barrymore announce to Sir Henry that they wish to leave Baskerville Hall and his reaction is I should be sorry to begin my life here by breaking an old family connection. The loyalty of the relationships between the owners and servants is highlighted with the Barrymores reasoning for leaving Baskerville Hall .. we were both very much attached to Sir Charles.. I fear that we shall never again be easy in our minds at Baskerville Hall.

Shape Memory Alloys Research

Shape Memory Alloys Research 1.1 General considerations When a regular metallic alloy is subjected to an external force greater than its elastic limit, it deforms plastically, i.e. the deformation persists after returning to the unloaded state. The Shape Memory Alloys (SMAs) do not follow this behavior. At low temperatures, an SMA specimen may undergo a plastic deformation of about few percent, and then fully recover its initial shape that had at higher temperature by simple heating above a threshold temperature. Their ability to recover their form when the temperature is raised, makes this class of materials unique. This phenomenon has been discovered in 1938 by researchers working on the gold-cadmium alloys [Gilbertson (1994)]. The shape memory effect remained a laboratory curiosity until 1963, when the first industrial and medical applications appeared. 1.2 Martensitic Transformation The shape memory effect is based on the existence of a reversible phase transformation of thermoelastic martensitic type [Kurdjumov, Khandros (1949), Kumar, Lagoudas (2008)], between a microstructural state at high temperature (austenite phase) and a microstructural state at low temperature (martensite phase) [Patoor et al. (2006), Lagoudas et al. (2006)]. Austenite has in general a cubic crystal lattice, while martensite is of tetragonal, monoclinic, or orthorhombic crystal lattice. The transformation from one crystal lattice to the other occurs by distortion of the shear lattice does and not by atoms diffusion. This type of transformation is called martensitic transformation [Perkins (1975), Funakubo (1987), Otsuka, Wayman (1999)]. In reality, the matrenitic transformation in SMAs is a phase transformation of the first order, where there is co-existence of several phases, and there is presence of interfaces between the phases [Guà ©nin (1986)]. Historically, the term martensitic transformation describes the transformation of the austenite of steels (iron-carbon alloys) to martensite during a quenching. By extension, this term has been generalized to a large number of alloys whose phase transformations have certain characteristics typical of the transformation of steels [Rosa (2013)]. During martensitic transformation of a SMA, the crystal lattice of the material changes its shape. The microstructure of martensite is characterized by a change in shape and by the difference in volume, which exists between matrensitic and austenitic phase [Duerig et al. (1990)]. Therefore, internal strains arise during the emergence of martensitic areas within the austenite. The internal strains can be partially relaxed by the formation of several areas of self-accommodated martensite crystals that minimize the overall deformation induced. These areas called variants and are oriented in different crystallographic directions [Kumar (2008)]. In the absence of external strains, these variants are equally possible and the distribution of self-accommodated groups allows the material to be transformed in order to retain its original shape. Therefore, the formation of the martensite results in elastic (reversible) deformations [Funakubo (1987)]. At constant temperature, the martensite-austenite interfaces are in steady state. A change in temperature in one direction or the other results in moving these interfaces to the benefit of one or the other phase structure. The interfaces can also move under the action of an imposed strain. A specimen can therefore be distorted not by sliding, which is the usual mechanism of plastic deformation, but by the appearance and disappearance of martensite variants [Kumar (2008)]. Therefore, during martensitic transformation atoms in the structure move on very small distances leading to deformation of the crystal lattice. This causes a small variation in volume with shearing of the structure in a specific direction. During the transformation process, the growth of martensite crystals occur in form of platelets to minimize the energy at the interface. The martensitic variants can occur in two different types: twinned martensite (formed by combination of self-accommodated martensite variants) and detwinned martensite (reoriented martensite) where a particular variant dominates [Liu, Xie (2007)]. The characteristic behavior of SMAs is based upon the reversible phase transformation from austenitic phase to martensitic phase and the opposite. By cooling under zero loading, the crystal sructure changes from austenitic to martensitic phase (forward transformation to twinned martensitic phase). This transformation is resulting in the development of a number of martensitic variants, which are arranged in a way that the average change in macroscopic shape is insignificant, causing a twinned martensite [Leclercq, Lexcellent (1996)]. When the material is heated at the martensite phase, the crystal structure is transforming to austenite (reverse transformation from detwinned martensitic to austenitic phase), leading to recovery of shape [Sabu ri, Nenno (1981), Shimizu, Otsuka, Perkins (1975)]. The above process is called Shape Memory Effect (SME) [Schetky (1979), Wayman, Harrison (1989)]. The martensitic transformation is characterized by four temperatures (Figure 2) [Gotthard, Lehnert (2001)]: MS: Temperature below which the martensite appears (martensite start) MF: Temperature below which the entire sample is transformed into martensite (martensite finish) AS: Temperature above which the austenite appears (austenite start) AF: Temperature above which the entire sample is transformed into austenite (austenite finish) The transformation begins at the cooling to the temperature MS. This transformation is completed to the temperature MF. Between these two temperatures, there is coexistence of two phases, which is a characteristic of transformation of the first order. If the cooling is interrupted, the material will not change. To go back to the initial shape, the temperature is increases so that the inverse transformation begins at the temperature AS and finishes to temperature AF, which is higher than MS [Massalski et al. (1990)]. If the trace on a diagram (Figure 1) the volume fraction of material processed as a function of temperature, there is a hysteresis loop, due to the presence of an irreversible energy corresponding to dissipation of mechanical energy transformed into heat [Ortin, Planes, Delaey (2006), Wei,Yang (1988)]. Figure 1 Martensitic transformation temperatures [Gotthard, Lehnert (2001)] The thermoelastic reversibility of the crystal lattice is certain in the case of an ordered alloy [Otsuka, Shimizu (1977)]. The correlation between the manifestation of martensitic transformation and atomic order was shown experimentally in Fe-Pt SMAs [Dunne, Wayman (1973)]. Nevertheless, in disordered alloys, such as Fe-Pd, Mn-Cu and In-TI, can occur thermoelastic transformation too. The atomic order is, therefore, a sufficient condition for manifestation of thermoelastic transformation, but not necessary [Otsuka, Shimizu (1977)]. 1.3 Thermomechanical properties of SMAs Several effects specific to the SMAs appear through the transformations of the crystal lattice as a function of temperature and of the field of stresses applied on the material [Duerig, Melton, Stà ¶ckel (2013)]. 1.3.1 Pseudoelastic Effect In general, by pseudoelasticity we describe both the materials superelastic behavior, as well as rubble-like behavior. Superelastic behavior is called the reversible phase transformation produced by thermo-mechanical loading. Rubber-like effect refers to the reversible martensitic re-orientation. The stress-strain curve during this process resamples to the superelastic behavior, which is similar to rubbers nonlinear elastic behavior [Otsuka, Wayman (1999)]. Therefore, a part from inducing phase transformation thermally, martensitic transformation can also be prompt by applying on the material appropriately high mechanical loading, resulting in creating a martensitic phase from austenite. When the temperature of the SMA goes above AF, shape recovery is resulted while unloading. Such behavior of the material is termed pseudoelastic effect [Kumar (2008)]. Stress-induced martensite, is generally forming from austenite when external stress is present. The process of forming stress-induced martensite can occur through different thermomechanical loading routes [Miyazaki, Otsuka (1986)]. One form of stress-induced martensite is the detwinned martensitic phase formed from austenitic after application of external stress. The material, during the stress-induced martensitic transformation and the reversed process, shows nonlinear elastic behavior described by closed à Ã†â€™-ÃŽÂ µ curves. This nonlinear elastic behavior is called pseudoelastic transformation [Otsuka, K. and K. Shimizu (1981)]. The shape recovery is due to crystallographic reversibility of transformation, like in the shape memory effect. Hence, the two phenomena, transformation pseudoelasticity and shape memory effect are practically the same except the fact that reverse transformation is produced by warming the specimen to temperature above AF. In reality, an alloy that un dergoes thermoelastic martensitic transformation exhibits both transformation pseudoelasticity and shape memory effect [Otsuka, K. and K. Shimizu (1981)]. Nevertheless, for occurring transformation pseudoelasticity, the necessary stress for slip should be greater than that for stress-induced martensite transformation. As an example, we can refer to equiatomic Ti-Ni alloys which are exposed to slip and do not exhibit any transformation pseudoelasticity, regardless of their Ni content. It was shown, however, that Ni-rich Ti-Ni alloys subjected to annealing after cold working, causing refining of their grain size, leads in raising critical slip stress, which results in any transformation pseudoelasticity [Miyazaki et al. (1982), Saburi, Tatsumi, Nenno (1982), Saburi, Yoshida, Nenno (1984)]. The existence of transformation pseudoelasticity is affected by crystalline orientation, composition of the alloy, and direction of applied stresses [Miyazaki, Otsuka (1986)]. 1.3.2 One-Way Shape Memory Effect Another property of SMAs is the one-way shape memory effect. It takes place in four steps: (1) The material is cooled to a temperature lower than MF (the parent austenitic phase) to obtain self-accommodated martensite. (2) Re-orientation of variants of the martensite is obtained via application of stress. (3) The stress is released at constant temperature T F. The material remains to a shape depending on the stress field. (4) The sample is heated at a temperature T > AF making re-appear the austenitic phase and the material gets its original shape, as shown in Figure 2. Figure 2 One-way shape memory effect [Miyazaki, Otsuka (1986)] Two conditions are necessary for occurring shape recovery by shape memory effect. Firstly, the transformation should be reversible, and second, slip should not occur during the entire deformation process. Martensitic transformations in ordered alloys are reversible in nature [Miyazaki, Otsuka (1986), Arbuzova, Khandros (1964)], so the entire shape memory effect mainly occurs in this type of alloys. The second condition is necessary because in the case of high stress and every type of deformation mode (stress-induced martensitic transformation in parent phase, twinning in the martensitic phase) slip can be induced, resulting in plastic strain and, not completed recovery of shape. In the one-way shape memory effect, the shape in memory by the SMA is the one of the parent phase. 1.3.3 Two-Way Shape Memory Effect The two-way shape memory effect is the reversible passage of a shape at a high temperature to another shape at low temperature under stress. The two-way shape memory effect should precede the SMA training [Nagasawa, et al. (1974]. Training of SMAs consists of temperature cycling at constant stress or stress cycling at constant temperature. During training, microstructural defects (i.e. dislocations) lead to internal stresses and therefore promote oriented martensite. A SMA subjected to training can then move from austenitic phase to oriented martensite under zero load by simple change of temperature [Schroeder, Wayman (1977)]. It has then a shape in memory for each of the two phases. Various methods that cause two-way shape memory effect have been suggested, such as, large deformation in stress-induced martensite transformation at temperatures > MS [Delaey et al. (1974)], shape memory effect training [Schroeder, Wayman (1977)], stress-induced martensite training [Schroeder, Wayman (1977)], training involving both of shape memory effect as well as stress-induced martensite [Perkins, Sponholz (1984)] remaining in martensite state while heating at a temperature > AF [Takezawa, Shindo, Sato (1976)], as well as using precipitates [Tadaki, Otsuka, Shimizu (1988)]. 1.4 Transformation Induced Plasticity (TRIP) Several experimental studies have shown the development of nonlinear plastic (irreversible) strain when phase transformations occur [Greenwood, Johnson (1965), Abrassart (1972), Magee (1966), Desalos (1981), Olson, Cohen (1986), Denis et al. (1982)]. This mechanism of deformation is termed Transformation Induced Plasticity (TRIP), resulting from internal stress rising from the change in volume related to the transformation, as well as from the associated change in shape [Marketz, Fischer (1994)]. TRIP differs from classical plasticity. Although plasticity is caused from the applied stress or variation in temperature, TRIP is triggered by phase variations, and occurs even at low and constant stress levels [Gautier et al. (1989), Leblond et al. (1989), Gautier (1998), Tanaka, Sato (1985), Fischer et al. (2000, 1996)]. TRIP takes place because of two separate mechanisms. The first, refers to a process of accommodation of micro-plasticity related to volume change [Greenwood, Johnson (196 5)]. The other, refers to an orientation caused by shear internal stresses, favoring the direction of preferred orientation for the formation of martensite when and external stress is present, which involves change in shape [Magee (1966)]. TRIP is caused by the difference in compactness of the lattice structure between the austenite (parent) and the martensite (product) phase [Greenwood, Johnson (1965)]. During martensitic transformation, this difference has produces a change in volume as well as internal stresses causing plasticity in the phase with less yield stress, which is weaker   [Paiva, Savi, Pacheco (2005)]. REFERENCES Abrassart, F., Influence des Transformations Martensitiques sur les Proprià ©tà ©s Mà ©caniques des Alliages du Systà ¨me Fe-Ni-Cr-C, Thà ¨se dÉtat, Università © de Nancy I (Trance), 1972. Arbuzova, I. and L. Khandros, Abnormal elongation and reduced resistance to plastic deformation due to martensitic transformation in the alloy CU-AL-NI. Phys. Metals Metallogr., 17(3), pp. 68-74, 1964. Delaey, L., et al., Thermoelasticity, pseudoelasticity and the memory effects associated with martensitic transformations. Journal of Materials Science, 9(9), pp. 1521-1535, 1974. Denis, S., Simon, A. and Beck, G., Estimation of the Effect of Stress/Phase Transformation Interaction when Calculating Internal Stress during Martensitic Quenching of Steel, Trans. Iron Steel Inst. Jap., Vol. 22, pp. 505, 1982. Desalos, Y., Comportement dilatomà ©trique et mà ©canique de lAustà ©nite Mà ©tastabledun Acier A 533, IRSID Report n. 95.34.94.01 MET 44, 1981. Duerig, T., K. Melton, D. Stockel, C. Wayman (Eds.), Engineering Aspects of Shape Memory Alloys, Butterworth-Heinemann, London, 1990. Duerig, T.W., K. Melton, and D. Stà ¶ckel, Engineering aspects of shape memory alloys,   Butterworth-Heinemann, 2013. Dunne, D. and C. Wayman, The effect of austenite ordering on the martensite transformation in Fe-Pt alloys near the composition Fe3Pt: I. Morphology and transformation characteristics. Metallurgical Transactions, 4(1), pp. 137-145, 1973. Fischer, F.D., Reisner, G., Werner, E., Tanaka, K., Cailletaud, G. and Antretter, T., A New View on Transformation Induced Plasticity, International Journal of Plasticity, vol. 16, pp. 723-748, 2000. Fischer, F.D., Sun, Q.P. and Tanaka, K., Transformation induced plasticity (TRIP), Applied Mechanics Review, Vol. 49, pp. 317-364, 1996. Funakubo, H. (Ed.), Shape Memory Alloys, Gordon and Breach Science Publishers, 1987. Funakubo, H., Shape Memory Alloys, Gordon and Breach Sci. Publ, New York, p. 275, 1987. Gautier, E., Dà ©formation de transformation et plasticità © de transformation, École dà ©tà © MH2M, Mà ©thodes dHomogà ©nà ©isation en Mà ©canique des Matà ©riaux, La Londe Les Maures (Var, France), 1998. Gautier, E., Zhang, X.M. and Simon, A., Role of Internal Stress State on Transformation Induced Plasticity and Transformation Mechanisms during the Progress of Stress Induced Phase Transformation, International Conference on Residual Stresses- ICRS2, (Ed: G. Beck, S. Denis and A. Simon), Elsevier Applied Science, London, pp. 777-783, 1989. Gilbertson, R. G. , Muscle Wires Project Book, Mondotronics, p. 2-1/2-8, 1994. Gotthard R. and T. Lehnert, Alliages à   mà ©moire de forme, Traità © des matà ©riaux n °19: Matà ©riaux à ©mergents, p. 81-105, 2001. Greenwood, G.W. Johnson, R.H., The Deformation of Metals under Small Stresses during Phase Transformation, Proceedings of the Royal Society A 283, pp. 403-422, 1965. Greenwood, G.W. and Johnson, R.H., The Deformation of Metals under Small Stresses during Phase Transformation, Proceedings of the Royal Society A 283, pp. 403-422, 1965. Guà ©nin, G., Alliages à   mà ©moire de forme, Techniques de lIngà ©nieur, vol. 10, p. 1-11, 1986. Kumar P., Introduction to Shape Memory Alloys, Shape Memory Alloys, 2008 Kumar, P. and D. Lagoudas, Shape Memory Alloys Modeling and Engineering Applications. 2008, Springer Science, New York, NY. Kurdjumov, G. V., L. G. Khandros, First reports of the thermoelastic behaviour of the martensitic phase of Au-Cd alloys, Doklady Akademii Nauk SSSR 66 (1949) 211-213. Lagoudas, D. C., P. B. Entchev, P. Popov, et al., Shape memory alloys, Part II: Modeling of polycrystals, Mechanics of Materials, vol. 38, p. 430-462, 2006. Leblond, J., Devaux, J. and Devaux, J.C., Mathematical Modeling of Transformation Plasticity in Steels I: Case of Ideal-plastic Phases, International Journal of Plasticity, Vol. 5, pp. 551-572, 1989. Leblond, J., Mathematical Modeling of Transformation Plasticity in Steels II: Coupling with Strain Hardening Phenomena, International Journal of Plasticity, Vol. 5, pp. 573-591, 1989. Leclercq S., and C. Lexcellent, A general macroscopic description of the thermomechanical behavior of shape memory alloys, Journal of the Mechanics and Physics of solids, 44, 953-980, 1996. Liu Y., and Z. Xie, Detwinning in shape memory alloy, In: Progress in Smart Materials and Structures, Ed. Peter L. Reece, pp. 29-65, 2007. Magee, C.L., Transformation Kinetics, Microplasticity and Aging of Martensite in Fe-31 Ni, Ph.D. thesis, Carnegie Institute of Technology, Pittsburg, PA, 1966. Marketz, F.   and   Fischer,   F.D.,   A   Micromechanical   Study   on   the   Coupling   Effect   Between   Microplastic Deformation and Martensitic Transformation, Computational Materials Science, Vol. 3, pp. 307-325, 1994. Massalski, T.B., et al., Binary alloy phase diagrams. vol. 3. ASM International, pp. 1485, 1990. Miyazaki S, Ohmi Y, Otsuka K, Suzuki Y. Characteristics of deformation and transformation pseudoelasticity in Ti-Ni alloys. Le Journal de Physique Colloques, 43, 1982. Miyazaki, S. and K. Otsuka, Deformation and transition behavior associated with theR-phase in Ti-Ni alloys. Metallurgical Transactions A, 17(1), pp. 53-63, 1986. Nagasawa, A., et al., Reversible shape memory effect. Scripta Metallurgica, 8(9), pp. 1055-1060, 1974. Olson, G.B. and Cohen, M., Mechanical Properties and Phase Transformation in Engineering Materials, TMS-AIME, Warrendale, Pa (Ed: S. D. Antolovich, R. O. Ritchie and W. W. Gerberich), pp.367, 1986. Ortin, J., A. Planes and L. Delaey , Hysteresis in Shape-Memory Materials in The Science of Hysteresis, (2006), pp. 467-553. Otsuka and K, Shimizu, K., Ser. Metall. 1, pp. 757-60, 1977. Otsuka, K. and K. Shimizu, Pseudoelasticity, In: Metals Forum, 1981. Otsuka, K., C. M.Wayman (Eds.), Shape Memory Materials, Cambridge University Press, Cambridge, 1999. Paiva, A., M.A. Savi, P.M. Pacheco, Modeling transformation induced plasticity in shape memory alloys, Proceedings of COBEM, 18th International Congress of Mechanical Engineering, Nov. 6-11, 2005, Ouro Preto, MG, 2005. Patoor, E., D. C. Lagoudas, P. B. Entchev, et al., Shape memory alloys, Part I: General properties and modeling of single crystals, Mechanics of Materials, vol. 38, p. 391-429, 2006. Perkins, J. and R. Sponholz, Stress-induced martensitic transformation cycling and two-way shape memory training in Cu-Zn-Al alloys. Metallurgical transactions A, 15(2), pp. 313-321, 1984. Perkins, J., Shape Memory Effects in Alloys, Plenum Press, New York, 1975. Rosa M., Phase Transformations in Steels, Volume 1: Fundamentals and Diffusion-Controlled Transformations, International Journal of Environmental Studies, vol. 70(2), pp. 337-338, 2013. Saburi, T. and S. Nenno, The shape memory effect and related phenomena. Solid to Solid Phase Transformations, pp. 1455-1479, 1981. Saburi, T., M. Yoshida, and S. Nenno, Deformation behavior of shape memory TiNi alloy crystals. Scripta metallurgica, 18(4), pp. 363-366, 1984. Saburi, T., T. Tatsumi, and S. Nenno, Effects of heat treatment on mechanical behavior of Ti-Ni alloys. Le Journal de Physique Colloques, 43(C4), pp. C4-261-C4-266, 1982. Schetky, L., Shape-memory alloys, Scientific American 241 (74-82), 1979. Schroeder, T. and C. Wayman, The two-way shape memory effect and other training phenomena in Cu Zn single crystals. Scripta Metallurgica, 11(3), pp. 225-230, 1977. Shimizu, K., K. Otsuka, and J. Perkins, Shape Memory Effects in Alloys. Perkins, J., Ed.(New York: Plenum), pp. 60-87, 1975. Tadaki, T., K. Otsuka, and K. Shimizu, Shape memory alloys. Annual Review of Materials Science, 18(1), pp. 25-45, 1988. Takezawa, K., T. Shindo, and S.I. Sato, Shape memory effect in 1-CuZnAl alloys. Scripta Metallurgica, 10(1), pp. 13-18, 1976. Tanaka, K. and Sato, Y., A Mechanical View of Transformation-Induced Plasticity, Ingenieur Archiv 55, pp. 147-155, 1985. Wayman, M., J. Harrison, The origins of the shape memory effect, Journal of Minerals, Metals, and Materials 41 (99) pp. 26-28, 1989. Wei, Z., D. Yang, On the hysteresis loops and characteristic temperatures of thermoelastic martensitic transformations, Scripta Metallurgica, Volume 22, Issue 8, 1988, pp. 1245-1249.

Detective Fiction & Sir Arthur Conan Doyle Essay -- Literary Analysis

According to the English crime writer P.D. James (1920-) â€Å"for a book to be described as detective fiction there must be a central mystery and one that by the end of the book is solved satisfactorily and logically, not by good luck or intuition, but by intelligent deduction from clues honestly if deceptively presented.† (James. 2009: 16). This is traditionally conducted via a detective; a figure deployed within the narrative structure ‘whose occupation is to investigate crimes’ (Oxford. 2006: 202). Therefore detective fiction represents an enigma, a puzzle to be solved through an intriguing series of events and clues presented by the writer to its audience; that are taken on a journey through a process of reasoning, elimination and conclusion to solve a mystery. The narrative formula allows the audience to engage on an exploration of self-discovery as â€Å"the mystery’s solution supplies a temporary sense of self through which the reader is offer ed an apparatus for negotiating the boundaries that define identity.† (McCracken. 1998: 50). Detective fiction can be defined and situated into various different categories; â€Å"one is taxonomic†¦placing it in relation to other types of popular literature†¦Westerns, science fiction, spy tales and so on. John G. Cawelti’s (Adventure) has grouped these types into larger categories called ‘archetypes’ which are convenient for making an initial distinction between two major kinds of detective fiction, ‘Mystery’ and ‘Adventure.’ (Rzepka. 2005: 9). This raises the question of how detective fiction appeals to past and present audience’s and its position as part of a mass market publication in contemporary society. In order to answer this question it is important to briefly summarise the rise o... ...e for Policing and Crime. (2012) History of the Metropolitan Police. [On-line] Available from: http://www.met.police.uk/history/definition.htm. [Accessed 21st April 2012] Penguin Readers, (2008) A Scandal in Bohemia. [On-line] Available from: http://www.penguinreaders.com/pdf/downloads/pr/teachers-notes/9781405879347.pdf. [Accessed 21st April 2012] Project Gutenberg. (2011) Detective Fiction (Bookshelf). [On-line] Available from: http://www.gutenberg.org/wiki/Detective_Fiction_(Bookshelf). [Accessed 20th April 2012] Sir Arthur Conan Doyle Literary Estate. (2000) The Official Website of the Sir Arthur Conan Doyle Literary Estate. [On-line] Available from: http://www.sherlockholmesonline.org/. [Accessed 20th April 2012] The Sherlock Holmes Company, (2010). [On-line] Available from: http://www.sherlockholmes.com/. [Accessed 21st April 2012]

One Blood Essay -- Essays Papers

One Blood One Blood is a book designed to highlight the life and works of Dr. Charles Drew and to set the record straight about his famous, tragic death. The book starts with the academic career of Dr. Drew. Dr. Drew attended Amherst College where he fought with the majority of white students that surrounded hi. He was an athletic student who had average grades. He was forced to go to Canada to attend medical school when no universities in the U.S. would grant him admission. He believed that the Canadian people were â€Å"color blind† because there was no segregation in the nation. After finishing school and some internships he came back to the United States to work with Dr. Beattie. With his foot in the door, Dr. Drew went on to make great achievements in the field of blood work. He pioneered the use of blood plasma for transfusions., an act that saved many lives during the course of WWII. He also co-founded one of the first blood-banks in the United States and help set international standards for blood donation and storage. Dr. Drew did not succeed without facing adversity though. Although qualified, he was refused admittance to several national medical organizations due to his color. Dr. Drew was a fair skinned, red haired black man, but a black man nonetheless. The organizations included the American Medical Association and the American College of Surgeons. Dr. Drew campaigned against the regulations barring blacks from joining local or national medical ... One Blood Essay -- Essays Papers One Blood One Blood is a book designed to highlight the life and works of Dr. Charles Drew and to set the record straight about his famous, tragic death. The book starts with the academic career of Dr. Drew. Dr. Drew attended Amherst College where he fought with the majority of white students that surrounded hi. He was an athletic student who had average grades. He was forced to go to Canada to attend medical school when no universities in the U.S. would grant him admission. He believed that the Canadian people were â€Å"color blind† because there was no segregation in the nation. After finishing school and some internships he came back to the United States to work with Dr. Beattie. With his foot in the door, Dr. Drew went on to make great achievements in the field of blood work. He pioneered the use of blood plasma for transfusions., an act that saved many lives during the course of WWII. He also co-founded one of the first blood-banks in the United States and help set international standards for blood donation and storage. Dr. Drew did not succeed without facing adversity though. Although qualified, he was refused admittance to several national medical organizations due to his color. Dr. Drew was a fair skinned, red haired black man, but a black man nonetheless. The organizations included the American Medical Association and the American College of Surgeons. Dr. Drew campaigned against the regulations barring blacks from joining local or national medical ...

Metapath Case Report Essay

1. PURPOSE The purpose of this briefing note is to provide recommendations for Metapath Software Corp. (â€Å"Metapath†) on its financing offers received in September 1997. These two offers came from 1) a fund consortium led by Robertson Stephens Omega Fund (â€Å"RSC†) and Technology Crossover Ventures (â€Å"TCV†) and 2) CellTech Communications (â€Å"CellTech†), a vendor of wireless technology which had recently gone IPO. 2. EXECUTIVE SUMMARY Metapath has made good progress in developing its business since its inception – generating $6.4m revenue in the September quarter of 1997 with representation of three large customers. However, with the ambition to win a good chance of IPO within the next two years, more capital needed to be raised to gain traction in customer acquisition and smooth out current quarter-to-quarter revenues. Metapath has received two offers as at September 1997 and they are discussed as follows: RSC and TCV consortium offered to buy $11.75 million of stock at a $76 million pre-money valuation (â€Å"Series E Preferred†). The proposed stock instrument was a participating convertible stock (â€Å"PCPT†). This instrument functions the same as the convertible preferred stock in the event of a qualified public offering whereas in the event of a sale, RSC and TCV consortium not only receives the face value of the consideration, but also gets the equity participation. CellTech offered Met apath’s shareholders to receive common stock at closing in CellTech at $115 million. 3. STATEMENT OF THE PROBLEMS The problems associated with the offers from RSC and TCV consortium are listed as follows: Proposed stock instrument is extremely dilutive to the founders in the event of a sale where the liquidity preference will reduce  the amount of funds available to the other four tranches from previous investments. If the Metapath goes public, the percentage of ownership for C & D tranches will be further diluted, after RSC and TCV consortium exercises its liquidity preference. The problems associated with the offers from CellTech are listed as follows: CellTech’s liquidity and financing issues. Strategic/Business fit between CellTech and Metapath. 4. ANALYSIS Comparing the term sheet of the offer from RSC and TCV consortium to that of CellTech, RSC and TCV’s PCPT had a much more dilutive impact to Metapath upon exit. Under liquidation, the term sheet stipulates that the Series E investors is entitled to claim its initial investment of $10.75 million plus any accrued but unpaid dividend. Any proceeds after this claim will then be distributed to all common and Series E Preferred shareholders on an as-converted pro-rata basis. This double dipping means that RSC will not only recover its initial investment of $5 millions, but also enjoys the convertible benefits. As a result, if the sale occurs before 2000, the profitability for A-D tranches will be negatively impacted by the ‘preferred’ characteristic in the Series E. However if the sale occurs after 2000, A and B tranches will be gradually redeemed on an annual basis, which will leave C and D tranches to be mostly impacted adversely by the preferred characteristic in the Series E stock. Under the circumstance of an IPO, tranches C, D and E will convert to common at their negotiated prices while A & B will be redeemed. However, on the flip side, the price offered by RSC and TCV consortium was $6, which was significantly higher than the first three rounds of financing (tranches A,B and C) at $1.05 and final round (tranche D) at $1.62. PCPT instrument was created to enable the consortium to mitigate the risks in the event of a sale/liquidation that would be of the founders’ interests and  value destroying. CellTech’s valuation of $115 million was certainly attractive for a company like Metapath with a revenue run rate of $25.6 million. However, this represents approximately 30% of the totally capitalisation. The willingness from CellTech to sacrifice such a large amount of capital indicates that either CellTech genuinely believed that Metapath would contribute significantly to the synergies to the NewCo or there could be asymmetric information hidden from the management. It signalled CellTech’s underlying business might have limited upside. This issue needs to be further investigated if offer is accepted from CellTech. In addition, CellTech’s balance sheet indicated ongoing liquidity and financing risks. As we can see from the table below, the company continued to face liquidity pressure where its cash ratio and quick ratio deteriorated over the course from 1995 to 1997. CellTech had six consecutive quarters operating loss, which indicated that its unhealthy operating cash flow ratio. Doubts were raised whether CellTech was a good strategic fit to Metapath’s business model. This is due to the fact that CellTech’s products were mostly hardware-based and installed in the field with cellular base stations, whereas Metapath’s products largely consisted of software running on standard server platforms in the wireless switching office. The only benefit gauged regarding this point was that some of CellTech’s engineers could potentially be useful to Metapath’s development group. 5. CONCLUSIONS The recommendation for Metapath is to take the offer from RSC and TCV consortium. Even though CellTech has performed well since the IPO and bullish views from the stock analysts, its potential information asymmetry issues and liquidity risk could harm the value of Metapath post acquisition. The limited strategic fit is also of our concern, which might constrain Metapath’s growth potential. With our ambition to lead Metapath to IPO, we see RSC and TCV consortium as a better fit in this case. Tranches A and B’s  interests will be protected through their initial capital structures. Tranches C and D’s interests will be diluted; however it enables Metapath to continue its growth momentum with limited downside.