Thursday, November 28, 2019

Christianity And Holocaust Essays - Christian Anti-Judaism

Christianity And Holocaust As a Jew, I agree with the statement If the time was ever ripe for Christians to finally abandon their age-old obsession with converting Jews, that time is now. I think its way to late for Christians to try and convert Jews. I think these obsessed people missed their chance long ago. I believe this because for thousands of years Jews have been persecuted. In the article it says that the Jews were considered demons. The article also states that Jews were supposed to be homeless and wander forever. But now the Jews have their own homeland, Israel. Before Israel was pronounced a Jewish state would have been a better time for these obsessed Christians to attempt to convert the Jews. But now there is no chance because Israel is such a strong country. The people that live in Israel are also very proud Jews and would most likely fight until the end for their beliefs. If the Jews were to all of a sudden convert then they'd be doing Hitler's job. I believe this would be terrible. I can understand a person changing their religion because of an outer religion marriage, but definitely not because some Christians wanted them to convert. At this present time Jews aren't being oppressed like they were in the past. So under no pressure I can't see any circumstances why a Jew wou ld convert. I also ask the question, how could any Jew convert to become Christian when the Christians were responsible for killing millions of Jews in the Holocaust? According to the article, Luther who is an anti-Semitic said, Jews should all convert to Christianity. But how would this change his views of the people who converted. These people were born Jews and will always be Jewish. He wrote a book called Of the Jews and their lies. If the Jews converted they'd be lying even more. This is because they'd be hiding from their original beliefs and customs pretending that they were Christian. When their children ask them what their ancestors were they'd have to lie and say, Christian. This would be the ultimate lie, especially for an orthodox Jew. After brutal comments coming from Christian anti-Semites makes it even harder for Jews to want to convert. Jews have overcome all these atrocities which have been inflicted by Christians. Why would they give in to the Christians who have c ommitted all the crimes. I also picked up in the article that without Jews the Christians would have no direct way to God. I also think there couldn't be Christians without Jews. Its says yet for us to cease to be Jews, Fackenheim writes would be to abandon our millennial post as witnesses to the God of our history. This is a strong statement which will make Jews proud to be Jews. Jews have survived many treacherous occasions. Some may say it's just as easy as converting but it's Religion

Monday, November 25, 2019

Understanding Mayan Human Sacrifice

Understanding Mayan Human Sacrifice Why did the Maya perform human sacrifices? That the Mayan people practiced human sacrifice is not in doubt, but providing motives is part speculation. The word sacrifice is from the Latin and it is associated with the word sacred- human sacrifices, like many other rituals in the Maya and other civilizations, were part of a sacred ritual, an act of appeasing or paying homage to the gods. Grappling With the World Like all human societies, the Maya grappled with uncertainty in the world, erratic weather patterns which brought drought and storms, the anger and violence of enemies, the occurrence of disease, and the inevitability of death. Their pantheon of gods provided some perceived control over their world, but they needed to communicate with those gods and to perform deeds showing that they were worthy of good luck and good weather. The Maya performed human sacrifices during particular societal events. Human sacrifices were conducted at specific festivals in their annual calendar, at times of crisis, at dedications of buildings, at the ends or beginnings of warfare, at the accession to the throne of a new ruler, and at the time of that rulers death. Sacrifices at each of these events likely had different meanings to the people who conducted the sacrifices. Valuing Life The Maya valued life highly, and according to their religion, there was an afterlife so human sacrifice of people they cared for- such as children- was not perceived as murder but rather placing that individuals life into the hands of the deities. Even so, the highest cost to an individual was to lose their children thus child sacrifice was a truly holy act, conducted at times of crisis or times of new beginnings. At times of war and at rulers accessions, human sacrifices may have had a political meaning in that the ruler was indicating his ability to control others. Scholars have suggested that public sacrifice of captives was to display that ability and to reassure the people that he was doing everything he could to stay in communication with the gods. However, Inomata (2016) has suggested that the Maya may never have evaluated or discussed the legitimacy of a ruler: sacrifice was simply an expected part of the accession. Other Sacrifices Maya priests and rulers also made personal sacrifice, using obsidian knives, stingray spines, and knotted cords to draw blood from their own bodies as offerings to gods. If a ruler lost a battle, he himself was tortured and sacrificed. Luxury goods and other items were placed in sacred locations such as the Great Cenote at Chichen Itza and in rulers burials along with the human sacrifices. When people in modern societies try to come up with the purpose of human sacrifice in the past, we are prone to put our own concepts about how people think about themselves as individuals and members of society, how authority is established in our world, and how much control we believe our gods have over the world. It makes it difficult if not impossible to parse out what the reality might have been for the Maya, but no less fascinating for us to learn about ourselves in the process. Sources: Ardren T. 2011. Empowered Children in Classic Maya Sacrificial Rites. Childhood in the Past 4(1):133-145.Inomata T. 2016. Theories of Power and Legitimacy in Archaeological Contexts: The Emergent Regime of Power at the Formative Maya Community of Ceibal, Guatemala. Political Strategies in Pre-Columbian Mesoamerica. Boulder: University Press of Colorado. p 37-60.Pà ©rez de Heredia Puente EJ. 2008. Chen K’u: The Ceramic of the Sacred Cenote at Chichà ©n Itz. Tulane, Louisiana: Foundation for the Advancement of Mesoamerican Studies, Inc. (FAMSI).

Thursday, November 21, 2019

Discussion Essay Example | Topics and Well Written Essays - 250 words - 77

Discussion - Essay Example Another good impact of the association is that the rate of exchange in the various commercial transactions is relatively favorable among the three states as opposed to when a country that is not a member of the union involves herself in the commercial transactions by making a purchase of any kind (Tamara, 2011). This was through the removal of the tariffs or the taxes that were charged on various business people who took part in the importation and exportation of commodities from any of the three states. It consequently aimed at raising the wages and salaries f the employees slightly in the countries which was quite successful. This also led to the increment of job opportunities in the countries (Tamara, 2011). However despite all these moves that have been moved by the union, there are challenges that have been realized. One major failure that has hit the union is on the infrastructural development in Mexico through factories. The poor location is a big challenge as there is string and stiff completion that is posed by the workers from Asia (Tamara, 2011). The industries should be decentralized and delocalized in various parts of the Mexican country. This will be of much significance as it will not be a point of target during wars, regulating pollution in one area and also offering jobs to many (Tamara,

Wednesday, November 20, 2019

The developments of salt glazed and alkaline glazed Assignment

The developments of salt glazed and alkaline glazed - Assignment Example These colors together with the introduction of the salt glaze produced an attractive and eye-appealing pieces of artwork that made them stand above most of their competitors. Moreover, their style of using the quirky incised decorations of fish and birds on their pottery. Together with revolutionizing of pottery to wider wares made them stand above everybody else in the industry at that time (Quimby & Ian). Alkaline Glaze stoneware of Western Piedmont in the North Carolina is the most appealing among the other regions. Their potters were Daniel Seagle, Franklin and John Goodman, David Hartsoe, together with Ritchie and Reinhardt. They majored in making types of jugs of different sizes. They had modest farms and used clay that had a high percentage of iron and rutile that gave their wares the strength and attractive dark variegated appearance. In addition, they were among the few potteries that embraced slip painting and emblem decorations using different streaks of melted windowpane glasses. Furthermore, they were among the first potters to shift from the earth wares to stoneware, indicating their innovativeness (Quimby &

Monday, November 18, 2019

Diabetes type 2 Essay Example | Topics and Well Written Essays - 500 words

Diabetes type 2 - Essay Example inactivity, fat distribution (excess fat in the abdomen), age (above 45 years), race (African Americans, Asian Americans and Latinos among other natives), pregnancy and prediabetes (higher than normal blood sugar level). This paper will discuss two treatment methods of diabetes type 2 and the professionals involved in these treatments. With over 2.9 million of UK population being diagnosed with diabetes, and there being no cure for diabetes, an effective treatment plan is necessary and which should be followed. The two common methods of treatment of this disease are monitoring the blood sugar level and using medication. The first treatment method is the use of medication. This treatment method is mainly for those who cannot maintain a reduced blood sugar level or their condition has advanced. Some of the diabetes medications prescribed includes metformin (which is aimed at lowering production of glucose in the liver), glipizide (aimed at stimulating the pancreas to release more insulin) or acarbose (that prevents enzymes from breaking down carbohydrates in the intestines). Other than these medications, there is also insulin therapy which is administered through injection and its advantages is that it works rapidly and lasts longer (Spencer and Hughes, 2005). Monitoring of the blood sugar level requires a change in the lifestyle (as some of the risk factors are associated with lifestyle). This will require the diabetes patient to constantly exercise to burn off excessive weight around the abdomen area and in order to also reduce weight generally for those considered obese when a BMI (body mass index) is conducted. Healthy eating is also required which means eating foods high in fibre like whole grains, plenty of fruits and vegetables. A reduction in the intake of carbohydrates, sweets and animal products in general is also one of the treatment plans. It is also important to lay off stress or factors causing or perpetuating stress as well as reducing alcohol

Friday, November 15, 2019

Calculations of Rare Earth (Y, La and Ce) Diffusivities

Calculations of Rare Earth (Y, La and Ce) Diffusivities First-principles calculations of rare earth (Y, La and Ce) diffusivities in bcc Fe Xueyun Gaoa,b,[*], Huiping Rena, Chunlong Lia,c, Haiyan Wanga, Yunping Jia, Huijie Tan a ABSTRACT: The impurity diffusivities of rare earth elements, Y, La and Ce, in bcc Fe have been investigated by the first-principles calculations within nine-frequency model. The microscopic parameters in the pre-factor and activation energies have been calculated. For the three elements, the first nearest-neighbor solute-vacancy interactions are all attractive, in which Y and La solute atoms more favorably bond to the vacancy. The solute-vacancy binding energy can be explained in terms of the combination of the distortion binding energy and the electronic binding energy, and the decomposition results of the total solute-vacancy binding energy suggest that the strain-relief effect accounts for larger portion of the binding energy for Y and La than that for Ce. The diffusion coefficients of Y are one order of magnitude larger than that of La, and predicted to be comparable to that of Fe self-diffusion. Compared with Y and La, Ce shows large migration energy and small solute-vacancy att ractive interaction, which accounts for the lowest diffusivity of this element. Keywords: Diffusion; Rare earth; Bcc Fe; First-principles calculations 1. Introduction In the past years, the addition of rare earth (RE) elements has been regarded promising in steels. A series of beneficial research for the development of rare earth addition have been focused on the purification and modification of inclusion, since RE elements are characterized by significant negative free energy changes for compound formations [1-3]. RE doping also improve the high-temperature oxidation resistance and the corrosion resistance of steels due to the reactive-element effect (REE) [4,5].In addition, the solidification, phase transformations, recrystallization behavior, of steel can be improved by adding RE [6, 7]. Knowledge of the above mentioned mechanism is essential to understand the influence of RE additions on the physical, chemical and various properties of steels. In spite of the progress so far in RE application, it is apparent that many questions still remain rather controversial. A thorough theoretical study on the diffusivities of RE elements in Fe-based alloy is still lacking, which is essential for understanding the effects of RE on the structure and properties of steel, and is also helpful for designing and preparing RE doped steels [8]. For the three commonly used RE elements, Y, La and Ce, to our knowledge, only the diffusion coefficient of Y has been reported [9]. The diffusion of substitutional-type solute is mainly controlled by vacancy mechanism. In this case, the interaction of solute atom with vacancy plays significant roles in understanding of the diffusion properties of solutes. To understand the microstructure evolution in bcc Fe alloy, DFT method has been applied in calculations of the binding energies of solute atom with vacancy [10]. Based on the nine-frequency model of Le Claire, Ding and Huang et al. [11,12] developed a computational framework to calculate the solute diffusion coefficients in bcc Fe, which presents an effective method in investigation of the diffusion properties in bcc Fe alloy. The purpose of this work is to investigate the impurity diffusivities of rare earth elements, Y, La and Ce, in bcc Fe by the first-principles calculations within nine-frequency model and the semi-empirical corrections for magnetization[11,13], calculate the associated solute-vacancy binding energies, migration energies, pre-factors and activation energies for these impurity diffusivities, as well as the self-diffusion coefficient of Fe, thus discuss the related factors of the diffusion coefficients. 2. Methodology The temperature dependence of diffusion coefficient D is expressed in the Arrhenius form D=D0exp(-Q/kBT), where D0 and Q are the pre-factor and activation energy, respectively. Below the Curie temperature, the self-diffusion and solute diffusion coefficients in bcc Fe deviate downward from the Arrhenius type relationship extrapolated from the paramagnetic state [14]. These deviations are attributed to the change of magnetization which affects the diffusion activation energy. To investigate the effect of magnetic disorder on the diffusion activation energy of spin-polarized metals, Ding et al. [15] reported a first-principles approach based on the spin-wave DFT method for studying the self-diffusion of bcc Fe and fcc Co, and the calculated values of ÃŽÂ ± agree well with the experimental data. More recently, by combination of the first-principle calculations and Heisenberg Monte Carlo simulations, Sandberg et al. [16] presented a quasi-empirical model to study the magnetic contribu tion to the self-diffusion activation energy of bcc Fe. Murali et al. [17] conducted a systematic study of the effects of phonon and electron excitations on the free formation energy of vacancy, the solute-vacancy binding energy, and the vacancy migration energy in bcc Fe. The authors then calculated the Fe self-diffusion coefficient based on the computed free energies, by employing the semi-empirical model presented in Ref. [18]. The diffusion associated data yielded by these methods are in good agreement with experiments. We employ the semi-empirical model to describe the dependence of the diffusion activation energy on the magnetization in the ferromagnetic state [18]: QF(T)=QP[1+ÃŽÂ ±s(T)2] (1) where QP is the activation energy in the paramagnetic state; s(T) is the ratio of the magnetization of bcc Fe at a certain temperature T to that at 0K, and has been experimentally measured [19,20]; the constant ÃŽÂ ± quantifies the extent of the influence of magnetic on activation energy, the measured value of ÃŽÂ ± for Fe self-diffusion is 0.156 [11].In the case of the solute species investigated in this context that have no measured ÃŽÂ ± values available, the values can be estimated from a linear correlation with the induced changes in local magnetization on Fe atoms in the first and second neighbor shells of a solute atom [21]. The first-principles calculations give direct access to the magnitude of the activation energies for self- and solute diffusion in the fully ordered ferromagnetic state (T=0K). Given the values of ÃŽÂ ± and s(T), we can compute QP through the relation , and QF(T) from Eq. (1). We based the diffusion calculations on the assumption that the mechanism of diffusion is primarily monovacancy mediated. The self-diffusion and solute diffusion coefficients on a bcc lattice can be expressed as following [11,22]: Dself=a2f0Cvw0 (2) Dsolute=a2f2Cvw2(-ΆGb/kBT) (3) where a is the bcc lattice constant, f0=0.727 is the self-diffusion correlation factor, f2 is the correlation factor for solute diffusion which depends on the relative vacancy jump frequencies around the solute atom. Cv denotes the equilibrium vacancy concentration, can be written as Cv=exp(ΆSf /kB)exp(-ΆHf /kBT), where ΆSf and ΆHf are the vacancy formation enthalpy and entropy, respectively, the harmonic approximation makes these two become temperature-independent constants. and kB is Boltzmanns constant. w0 and w2 are the vacancy hopping frequencies for Fe and solute atoms to exchange with a nearest-neighbor vacancy, respectively. Based on transition state theory (TST), the vacancy hopping frequency w is written as , where and are the phonon frequencies in the initial state and transition state, and the product in the denominator ignores the unstable mode; ΆHmig is the migration energy, gives the energy difference for the diffusin g atom located at its initial equilibrium lattice position and the saddle-point position. The solute-vacancy binding free energy ΆGb can be expressed as ΆGb =ΆHbTΆSb, where ΆHb and ΆSb are the binding enthalpy and entropy, respectively. The correlation factor f2 can be calculated using the nine-frequency model developed by Le Claire [13] which involves different jump frequencies of vacancies to their first neighbor position in the presence of the solute atoms, as illustrated in Fig. 1. In this model, the interaction of solute-vacancy is assumed up to second neighbor distance. The nine frequencies shown in Fig. 1 illustrate all of the distinct vacancy jumps in a bcc system with a dilute solute concentration, including the host Fe atom jump w0 without impurity. The detailed calculation procedures could be found in Ref. [11]. Fig. 1. Schematic illustration of the nine-frequency model for the bcc Fe crystalline with a solute atom. The arrows denote the jump directions of the vacancy. The numbers in the circle represent the neighboring site of the solute atom. For convenience, we can represent the self- and solute diffusion equations (Eqs.(2) and (3)) in Arrhenius form to obtain the pre-factor and activation energy of diffusion. By combining the above Eqs., the diffusion coefficient for Fe self-diffusion and solute diffusion can be expressed as: (4) For self-diffusion, the pre-factor is, and the activation energy given as . Also, the solute diffusion coefficient can be expressed in an Arrhenius form with the pre-factor is, and. The first-principles calculations presented here are carried out using the Vienna Ab initio Simulation Package(VASP) with the projector augmented wave(PAW) method and the generalized gradient approximation of Perdew-Burke-Ernzerhof functional(GGA-PBE) [23]. All calculations were performed in spin polarized. The computations performed within a 4à ¯Ã¢â‚¬Å¡Ã‚ ´4à ¯Ã¢â‚¬Å¡Ã‚ ´4 supercell including 128 atoms. The binding, vacancy formation and migration energies were calculated with 300eV plane-wave cutoff and 12à ¯Ã¢â‚¬Å¡Ã‚ ´12à ¯Ã¢â‚¬Å¡Ã‚ ´12 k-point meshes. The residual atomic forces in the relaxed configurations were lower than 0.01eV/Ã…. The transition states with the saddle point along the minimum energy diffusion path for vacancy migration were determined using nudged elastic band (NEB) method [24] as implemented in VASP. We adopt the harmonic approximation (HA) to consider the contribution of normal phonon frequencies to free energy. The normal phonon frequencies were calcu lated using the direct force-constant approach as implemented in the Alloy Theoretic Automated Toolkit (ATAT) [25] package. Similar cutoff energy, k-point mesh size and supercell size used for the total energies were used for the vibrational calculations. 3. Result and discussion Table 1 illustrates our calculated energies for vacancy formation, migration and binding, as well as the constant ÃŽÂ ± for solute species, the associated paramagnetic activation energies and fully ordered ferromagnetic activation energies for both self- and solute-diffusion. For pure bcc Fe, the vacancy formation energy and migration energy obtained here are consistent with the reported range of values, ΆHf=2.16-2.23 eV and ΆHmig=0.55-0.64 eV [11,26,27]. For Y impurity in bcc Fe, the calculated vacancy binding energy in full ordered ferromagnetic state also compare well with the previous first principles work [28], in which ΆHb=-0.73 eV. It can be seen that Y and La have smaller activation energy than that for Fe self-diffusion, while Ce is predicted to have a lager value of activation energy than that for Fe self-diffusion, in both the ordered ferromagnetic and paramagnetic state. Table 1 Vacancy formation energy ΆHf , solute-vacancy binding energy ΆHb, migration energy ΆHmig, the ferromagnetic activation energy and the paramagnetic activation energy QP; the variable dependence parameter of activation energy on magnetization ÃŽÂ ±. Fe Y La Ce ΆHf(eV) 2.31 à ¢Ã¢â€š ¬Ã¢â‚¬â„¢ à ¢Ã¢â€š ¬Ã¢â‚¬â„¢ à ¢Ã¢â€š ¬Ã¢â‚¬â„¢ ΆHb (eV) à ¢Ã¢â€š ¬Ã¢â‚¬â„¢ -0.69 -0.66 -0.43 ΆHmig (eV) 0.54 0.09 0.17 1.09 ÃŽÂ ± 0.156 0.088 0.038 0.125 (eV) 2.85 1.71 1.82 2.97 QP (eV) 2.47 1.57 1.75 2.64 Solute-vacancy binding energy plays a crucial role in understanding solute diffusion kinetics. Table 2 presents the binding energies of Y, La and Ce atoms with vacancy in their 1nn, 2nn and 3nn coordinate shells. From Table 2 it can be seen that referring to the first nearest-neighbor solute-vacancy pairs, the binding energies are all negative, which implies the solute-vacancy pairs are favorable. Specifically, Y and La impurities are computed to have higher values of solute-vacancy binding energies -0.69 eV and -0.66 eV in 1nn configuration, respectively, while that for Ce is -0.43 eV. Correspondingly, we found that Y, La and Ce atoms relax towards the 1nn vacancy by 22.3%, 19.6% and 12.2% of the initial 1nn distance (2.488 Ã…) after the structure optimization. The interactions of the solute-vacancy pair at the 2nn shells tend to be smaller in magnitude than that of 1nn, and that of Ce-vacancy predicted to be repulsive. The interactions of the 3nn solute-vacancy are relatively we ak, indicating that the interactions of the solute-vacancy are local. According to Le Clair model [13], in the situation that the interactions of the first and second nearest solute-vacancy neighbors are appreciable, the nine different jump frequencies should be considered. To obtain information on the origin of these attractive behaviors, we decompose the total binding energy into the distortion binding energyand the electronic binding energy as [29] . The distortion binding energy can be obtained by the distortion reducing of the bcc Fe matrix when a solute atom and a vacancy combine to form a solute-vacancy pair, and can be expressed as: (5) where and can be calculated as follows: after the supercell containing a solute-vacancy pair (or a substitutional atom) has been fully relaxed, the solute-vacancy pair (or the substitutional atom) is removed from the system, then the total energy can be calculated. denotes the total energy of the pure bcc Fe supercell, and denotes the total energy of the supercell containing a vacancy. Then can be calculated from . The calculated solute-vacancy binding energies of 1nn, 2nn and 3nn are shown in Table 2, along with the energy decomposition for 1nn solute-vacancy binding. The distortion energies (-0.31 to -0.65 eV) for all solute elements(Y, La and Ce) are negative, and much bigger than their corresponding electronic binding energies (-0.04 to -0.12 eV). This implies that the distortion energy accounts for a major part of the total solute-vacancy binding energy, i.e. the strain relief effect contributes significantly to the interaction between the impurity atom and the vacancy, esp ecially for the solute Y and La, which accounted for 94.2% and 97.0% of the total binding energy, respectively. Furthermore, there is a strong correlation between the binding energy and the distance of the solute-vacancy, and the lattice relaxation around the vacancy is local. For the case of Ce-vacancy , specifically, we found that Ce atom relax away from the 2nn vacancy by 4.3% of the initial 2nn distance, which leads to the positive binding energy. Table 2 Decomposition of the total solute-vacancy binding energy into distortion binding energy and electronic binding energy. Units are eV. Solute element Y La Ce ΆHb (1nn) -0.69 -0.66 -0.43 (1nn) -0.65 -0.64 -0.31 (1nn) -0.04 -0.02 -0.12 ΆHb (2nn) -0.16 -0.21 0.10 ΆHb (3nn) -0.06 0.09 -0.05 The calculated migration energies of the different vacancy jumps corresponding to the paths in Fig. 1 are listed in Table 3. The migration energies of w2 jump for Y and La are lower than that of w0 jump for host Fe atom (0.54 eV), while the migration barrier of Ce in bcc Fe is higher than that of Fe self-diffusion. The migration barrier of w2 jump for Y is 0.09 eV, comparable to the reported value of 0.03 eV and 0.02 eV [9, 30]. The results indicate that there is a correlation between the binding energy of solute-vacancy and the migration energy, i.e. the strong attraction of solute-vacancy in 1nn configuration gives rise the low migration energy of the corresponding vacancy jump. For the three solute atoms, because of the strong attraction of 1nn solute-vacancy, the migration barriers of which the 1nn vacancy jump away from the solute atom, i.e. w3, w3, and w3, are higher than that of the opposite jumps, i.e. w4, w4, and w4, as well as that of Fe self-diffusion in pure bcc Fe. And t he same tendency can be found in the results of jump w5 and w6. Table 3 Migration energies for different jumps in the presence of Y, La and Ce in bcc Fe matrix. Units are eV. Jump Y La Ce w2 0.09 0.17 1.08 w3 1.81 1.84 1.55 w4 0.91 0.99 0.92 w3 0.93 1.23 1.07 w4 0.04 0.03 0.08 w3 0.86 0.92 0.87 w4 0.12 0.05 0.11 w5 0.94 0.98 0.89 w6 0.69 0.67 0.82 The correlation factor f2 is related to the probability of the reverse jump of a solute atom to its previous position [31]. Table 4 lists the calculated values of correlation factors for Y, La and Ce at representative temperatures of 850, 1000 and 1150K. The correlation factor of Y is 3.3ÃÆ'-10-5 at 1000K, close to the value of 1ÃÆ'-106 obtained by Murali [9]. For the three elements, the correlation factors of Ce have the highest values, and the correlation factors of La are one order of magnitude lower than that of Y. Therefore, Ce atom is the most difficult to return back to its original position in the temperature range of our investigation. Including the smallest binding energy, highest migration energy and correlation factor, provides an explanation for the low diffusivity of Ce atom. Table 4 Correlation factors (f2) for Y, La and Ce solute-diffusion at representative temperatures of 850, 1000 and 1150K. T(K) Y La Ce f2 f2/ f0 f2 f2/ f0 f2 f2/ f0 850 6.4ÃÆ'-106 1.111 2.9ÃÆ'-107 1.264 0.379 1.373 1000 3.3ÃÆ'-10-5 1.070 2.4ÃÆ'-106 1.223 0.381 1.370 1150 1.2ÃÆ'-104 1.034 1.4ÃÆ'-10-5 1.188 0.383 1.367 Table 5 lists the calculated diffusion activation energies and pre-factors for Fe self-diffusion and Y, La and Ce impurity diffusion. For pure bcc Fe, we find our calculated results are in good agreement with the published values. For Y impurity in bcc Fe, the calculated activation energy in full ordered ferromagnetic state is lower than the previous first principles work, and the pre-factor is as much as two orders of magnitude lager than the reported value. The experimental or calculated diffusion coefficients of La and Ce are not available to the best of our knowledge. For the case of experimental investigation, due to the very small solubilities of La and Ce in iron, the measured data may be affected by segregation of solutes, grain boundary, other impurities and the method of detection. Besides, the theory calculations, e.g. molecular dynamics (MD), first-principles etc. have not been applied widely in the study of RE contained steel yet, so the fundamental data of RE elements i n iron, such as the potential functions of Fe-La and Fe-Ce, is lacking. Table 5 Activation energies in the fully ordered ferromagnetic state () and paramagnetic state (QP), along with diffusion pre-factors for Fe self-diffusion and impurity diffusion of Y, La and Ce in bcc Fe. Reference (kJ mol-1) QP(kJ mol-1) D0(m2/s) Fe Present work 275.3 238.1 2.99ÃÆ'-10-5 Huang et al. [11] 277 239 6.7ÃÆ'-10-5 Nitta et al. [32] 289.7 ±5.1 250.6 ±3.8 2.76ÃÆ'-10-4 Seeger[33] 280.7 242.8 6.0ÃÆ'-10-4 Y Present work 165.9 159.9 1.09ÃÆ'-109 Murali et al. [9] 218.1 à ¢Ã¢â€š ¬Ã¢â‚¬â„¢ 8.0ÃÆ'-107 La Present work 175.6 169.2 2.88ÃÆ'-1010 Ce Present work 286.3 275.8 7.66ÃÆ'-106 Fig. 2 presents a direct comparison between the calculated and published temperature dependent diffusion coefficients for Fe self-diffusion and Y solute diffusion. For Fe self-diffusion, the calculated values are in good agreement with Huang et al. [11] and Nitta et al. [29], but smaller than the measured d

Wednesday, November 13, 2019

Televisions Effect on Self Image Essay -- Beauty Media

New mirrors are in the market and many homes have been remodeled with these mirrors. These new mirror are like snow whites mirror, they tell you who the most beautiful one of all is. A little girl is looking at her new mirror that tells her she has to wear makeup and look a certain way in order to be beautiful. This new mirror is the TV and the voice that is telling her is the media. The media portrays the beauty of women a certain way that is distorting beauty. The media distorts image so much that women start to see an unrealistic beauty and think that all women should actually look that way. An experiment done by Mahler Beckerley and Vogel (2010) demonstrate that women’s attitudes about certain looks reflect on how they view the models. There were two groups of women and some saw photos of models that were tanned and the other saw models that were not tanned. The participants then were told to describe their attitude about tanning. The group of women that viewed models that had a tan had a more positive attitude toward tans and the group of women that viewed models with out a tan had a negative attitude towards tanning. This research demonstrates that the media has a big influence in the decision women make on their appearance. So what is beauty? Is beauty the perfect supermodel on a magazine? Is it the stunning actress on television? Do you have to be thin and tall? According to Dictionary.com Unabridged, beauty is â€Å"the quality present in a thing or person that gives intense pleasure or deep satisfaction to the mind, whether arising from sensory manifestations (as shape, color, sound, etc.), a meaningful design or pattern, or something else (as a personality in which high spiritual qualities are manifest)†. However, the m... ...:10.1080/14680770903068266 Mahler, H. M., Beckerley, S. E., & Vogel, M. T. (2010). Effects of Media Images on Attitudes Toward Tanning. Basic & Applied Social Psychology, 32(2), 118-127. Slater, A., Tiggemann, M., Firth, B., & Hawkins, K. (2012). Reality Check: An Experimental Investigation of the Addition of Warning Labels to Fashion Magazine Images on Women's Mood and Body Dissatisfaction. Journal Of Social & Clinical Psychology, 31(2), 105-122. Solomon, M. R., Ashmore, R. D., & Basil G., E. (1994). Beauty before the Eyes of Beholders: The Cultural Encoding of Beauty Types in Magazine Advertising and Music Television. Journal Of Advertising, 23(2), 49-64. Bates, C. (2012, January 05). Mail online. Retrieved from http://www.dailymail.co.uk/health/article-2082500/A-quarter-children-10-diet-think-overweight-face-bullying-taunts-shocking-survey-finds.html