Effect of Short Range Correlation

Effect of Short Range Correlation The effect of short range correlation on the nuclear charge density distribution, elastic and inelastic electron scattering coulomb form factors of 16O nucleus Abdullah S. Mdekil Abstract The effect of the short range correlation on the charge density disribution, elastic electron scattering form factors and inelastic Coulomb form factors is studied for the two excited states (6.92 and 11.52 MeV) in is analyzed. This effect (which depends on the correlation parameter) is inserted into the ground state charge density distribution through the Jastrow type correlation function. The single particle harmonic oscillator wave function is used with an oscillator size parameter The parameters and are considered as free parameters, adjusted for each excited state separately so as to reproduce the experimental root mean square charge radius of In inelastic coulomb (longitidinal) form factors of 16O, two different models are employed for . In the first model (model A), is considered as a closed shell nucleus. Here, the model space in does not contribute to the transition charge density, because there are no protons outside the closed shell nucleus . In the second model (mo del B), the nucleus of is assumed as a core of with 2 protons and 2 neutrons move in and model space. It is found that the introduction of the effect of short range correlations is necessary for obtaining a remarkable modification in the calculated inelastic Coulomb form factors and considered as an essential for explanation the data amazingly throughout the whole range of considered momentum transfer. Keywords: charge density distribution, elastic charge form factors, inelastic longitudinal form factors, short range correlation. 1-Introduction Electron scattering provides more accurate information about the nuclear structure for example size and charge distribution. It provides important knowledge about the electromagnetic currents inside the nuclei. Electron scattering have been provided a good test for such evaluation since it is sensitive to the spatial dependence on the charge and current densities [1, 2, 3]. Depending on the electron scattering, one can distinguish two types of scattering: in the first type, the nucleus is left in its ground state, that is called elastic electron scattering while in the second type, the nucleus is left on its different excited states, this is called inelastic electron scattering [4, 5]. In the studies of Massen et al. [6-8], the factor cluster expansion of Clark and co-workers [9-11] was utilized to derive an explicit form of the elastic charge form factor, truncated at the two-body term. This form, which is a sum of one- and two-body terms, depends on the harmonic oscillator parameter and the correlation parameter through a Jastrow-type correlation function [12]. This form is employed for the evaluation of the elastic charge form factors of closed shell nuclei and in an approximate technique (that is, for the expansion of the two-body terms in powers of the correlation parameter, only the leading terms had been kept) for the open and shell nuclei. Subsequently, Massen and Moustakidis [13] performed a systematic study of the effect of the SRC on and shell nuclei with entirely avoiding the approximation made in their earlier works outlined in [6-8] for the open shell nuclei. Explicit forms of elastic charge form factors and densities were found utilizing the fac tor cluster expansion of Clark and co-workers and Jastrow correlation functions which introduce the SRC. These forms depends on the single particle wave functions and not on the wave functions of the relative motion of two nucleons as was the case of our previous works [14-20] and other works [6,21,22]. It is important to point out that all the above studies were concerned with the analysis of the effect of the SRC on the elastic electron scattering charge form factors of nuclei. There has been no detailed investigation for the effect of the SRC on the inelastic electron scattering form factors of nuclei. We thus, in the present work, perform calculations with inclusion this effect on the inelastic Coulomb form factors for closed shell nucleus. As a test case, the is considered in this study. To study the effect of SRC (which depends on the correlation parameter on the inelastic electron scattering charge form factors of considered nucleus, we insert this effect on the ground state charge density distribution through the Jastrow type correlation function [12]. The single particle harmonic oscillator wave function is used in the present calculations with an oscillator size parameter The effect of SRC on the inelastic Coloumb form factors for the two excited states (6.92 and 11.52 MeV) in is analyzed. 2. Theory Inelastic electron scattering longitudinal (Coulomb) form factor involves angular momentum and momentum transfer and is given by [23] (1) where and are the initial and final nuclear states (described by the shell model states of spin and isospin ), is the longitudinal electron scattering operator, is the center of mass correction (which removes the spurious states arising from the motion of the center of mass when shell model wave function is used), is the nucleon finite size correction and assumed to be the same for protons and neutrons, A is the nuclear mass number, is the atomic number and is the harmonic oscillator size parameter. The form factor of eq.(1) is expressed via the matrix elements reduced in both angular momentum and isospin [24] (2) where in eq. (2), the bracket ( ) is the three- symbol, where and are restricted by the following selection rule: (3) and is given by The reduced matrix elements in spin and isospin space of the longitudinal operator between the final and initial many particles states of the system including configuration mixing are given in terms of the one-body density matrix (OBDM) elements times the single particle matrix elements of the longitudinal operator [25] (4) where and label single particle states (isospin included) for the shell model space. The in eq. (4) is calculated in terms of the isospin-reduced matrix elements as [26] (5) where is the isospin operator of the single particle. (6) The model space matrix element, in eq. (6), is given by (7) where is the spherical Bessel function and is the model space transition charge density, expressed as the sum of the product of the times the single particle matrix elements, given by [26]. (8) Here, is the radial part of the harmonic oscillator wave function and is the spherical harmonic wave function. The core-polarization matrix element, in eq. (6), is given by (9) where is the core-polarization transition charge density which depends on the model used for core polarization. To take the core-polarization effects into consideration, the model space transition charge density is added to the core-polarization transition charge density that describes the collective modes of nuclei. The total transition charge density becomes (10) According to the collective modes of nuclei, the core polarization transition charge density is assumed to have the form of Tassie shape [27] (11) where is the proportionality constant given by [14] (12) which can be determind by adusting the reduced transition probability to the experimental value, and is the ground state charge density distribution of considered nuclei. For the ground state charge densities of closed shell nuclei may be related to the ground state point nucleon densities by [28, 29] (13) in unit of electronic charge per unit volume (e.fm-3). An expression of the correlated density (where the effect of the SRCs is included), consists of one- and two-body terms, is given by [13] (14) where is the normalization factor and is the one body density operator given by (15) The correlated density of eq. (14), which is truncated at the two-body term and originated by the factor cluster expansion of Clark and co-workers [10-12], depends on the correlation parameter through the Jastrow-type correlation (16) where is a state-independent correlation function, which has the following properties: for large values of and for It is so clear that the effect of SRCs, inserted by the function becomes large for small values of SRC parameter and vice versa. The one-body term, in eq. (14), is well known and given by (17) where is the occupation probability of the state and is the radial part of the single particle harmonic oscillator wave function. The two-body term, in eq. (14), is given by [13] (18) where (19) The form of the two-body term is then originated by expanding the factor in the spherical harmonics and expressed as [13] (20) where (21) and is the Clebsch-Gordan coefficients. It is important to point out that the expressions of eqs. (17) And (20) are originated for closed shell nuclei with where the occupation probability is 0 or 1. To extend the calculations for isotopes of closed shell nuclei, the correlated charge densities of these isotopes are characterized by the same expressions of eqs. (17) and (20) (this is because all isotopic chain nuclei have the same atomic number but this time different values for the parameters and are utilized. The mean square charge radii of nuclei are defined by (22) where the normalzation of the charge density distribution is given by (23) 3-Results and discussion The ground state CDD is calculated by eq.(13) together with eqs. (14), (17) and (20). The calculated CDD without (with) the effect of the SRC [i.e., when the correlation parameter is obtained by adjusting only the parameter (the two parameters and ) so as to reproduce the experimental root mean square (rms) charge radii of nuclei under study. The elastic electron scattering charge form factors which is simply the Fourier transform of the ground state CDD. In Fig. 1, we compare the calculated CDD [Fig. 1(a)] and elastic charge form factors [Fig. 1(b)] of with those of experimental data (the open circles). In Fig. 1, we compare the calculated CDD [Fig. 1 (a)] and elastic charge form factors [Fig. 1 (b)] of with those of experimental data (the open circles). The dashed curves are the calculated results without the inclusion of the effect of the SRC obtained with and fm. The solid curves are the calculated results with including the effect of the SRC obtained with fm-2 and fm. It is important to point out that the parameters and employed in the calculations of the dashed and solid curves are chosen so as to reproduce the experimental rms charge radius of Fig. 1 (a) illustrates that the calculated CDD of the dashed curve (without the effect of the SRC) is in such a good agreement with that of the experimental data, and the solid curve (with the effect of the SRC) is not in such a good agreement with that of the experimental data, e specially in the central region ( fm) of the distributions. The inclusion of SRC has the feature of reducing the central region of the distribution as seen in the solid curve of this figure. Inspection to the Fig. 1 (b) gives an indication that the solid curve is better describing the experimental data than that of the dashed curve, particularly in the region of momentum transfer fm-1. The rms charge radius calculated with the above values of and is 2.621 fm, which is less than the experimental value by 0.097fm, which corresponds to a decrease of nearly 3.6 % of the experimental value. Fig. 1. The calculated CDD and elastic charge form factors are compared with those of experimental data. The dashed curve corresponds to the values for the parameters and fm, the solid curve corresponds to the values for the parameters fm-2 and fm while the open circles and the triangles in Figs. 1 (a) and 1 (b) are the experimental data taken from [30] and [31], respectively. The effect of the SRC on the inelastic Coulomb form factors is studied for the two excited states (6.92 and 11.52 MeV) in. Core polarization effects are taken into consideration by means of the Tassie model [eq. (11)], where this model depends on the ground state charge density distribution. The proportionality constant [eq. (12)] is estimated by adjusting the reduced transition probability to the experimental value. The effect of the SRC is incorporated into the ground state charge density distribution through the Jastrow type correlation function [12]. The single particle harmonic oscillator wave function is employed with an oscillator size parameter The charge density distribution calculated without the effect of the SRC depends only on one free parameter (namely the parameter), where is chosen in such away so as to reproduce the experimental rms charge radii of considered nuclei. The charge density distribution calculated with the effect of the SRC depends on two free parameters (namely the harmonic oscillator size parameter and the correlation parameter), where these parameters are adjusted for each excited state separately so as to reproduce the experimental rms charge radii of considered nuclei. Two different models are employed for. In the first model (model A), is considered as a closed shell nucleus. In this model, the proton occupation probabilities in are assumed to be and Here, the model space in does not contribute to the transition charge density [i.e. ], because there are no protons outside the closed shell nucleus . Accordingly, the Coloumb form factors of come entirely from the core polarization transition charge density. In the second model (model B), the nucleus of is assumed as a core of with 2 protons and 2 neutrons move in and model space. In this model, the proton occupation probabilities in are assumed to be and Here, the total transition charge density [eq. (10)] comes from both the model space and core polarization transition charge densities. The OBDM elements of are generated, via the shell model code OXBASH [32], using the REWIL [33] as a realistic effective interaction in the isospin formalism for 4 particles move in the and model spac e with a core. In Table 1, the experimental excitation energies (MeV), experimental reduced transition probabilities (fm) and the chosen values for the parameters and for each excited state (used in the calculations of model A and B) in and are displayed. The root mean square (rms) charge radius calculated in both models with the effect of SRC is also displayed in this table and compared with that of experimental result. It is evident from this table that the values of the parameter employed for calculations with the effect of SRC are smaller than that of without SRC ( fm) . This is attributed to the fact that the introduction of SRC leads to enlarge the relative distance of the nucleons (i.e., the size of the nucleus) whereas the parameter (which is proportional to the radius of the nucleus) should become smaller so as to reproduce the experimental rms charge radius of the considered nuclei. Inelastic Coloumb form factors for different transitions in are displayed in Figs. 1 and 2. The calculated inelastic form factors obtained with model A are shown in the upper panel [Figs. 1(a)-2(a)] of the above figures whereas those obtained with model B are shown in the lower panel [Figs. 1(b)- 2(b)] of the above figures. It is obvious that all transitions considered in, presented in the above figures, are of an isoscalar character. Besides, the parity of them does not change. Here, the calculated inelastic form factors are plotted versus the momentum transfer and compared with those of experimental data. The dashed and solid curves are the calculated inelastic Coloumb form factors without and with the inclusion of the effect of the SRC, respectively. The open symbols are those of experimental data taken from [34, 35]. Table1. The experimental excitation energies and reduced transition probabilities, the chosen values for and as well as the rms charge radius calculated with the effect of the SRC of 16O. (fm) Model B Model A fm2L) (MeV) State (fm) (fm-2) (fm) (fm) (fm-2) (fm) [30] 2.704

The Parmenidean Paradox Of Motion Essay -- essays research papers

Philosophical thought begins with the Milesians, where intellectual curiosity propelled thinkers like Anaximander and Heraclitus to attempt to explain the phenomena of the universe by means of specific physical elements. During the 6th century BC, Eleatics, like Parmenides and Zeno, had rejected physical phenomena and propounded metaphysical paradoxes that cut at the roots of belief in the very existence of the natural world. Parmenides uproots the theories of his predecessors by bearing to light the logical possibilities of any philosophical inquiry. He argues that that the only things about which we can inquire about must exist, else our search is fruitless. Through deductive reasoning, Parmenides proves that if something exists, then it cannot come to be or perish, change or move, nor be the subject to any imperfection. His proteges were left with an enormous problem: how could one reconcile Parmenides’ rejection of change with the possibility of giving a rational account of the changing world of sense experience? By accepting only certain parts of his doctrine of being, his successors ultimately fail in their attempts to explain the changing universe in light of the Parmenidean paradox. How does Parmenides draw the conclusion that if something is, then it is unchanging? A more formal examination of his arguments regarding subjects of inquiry shows how he comes to the conclusion that all is one. The only ways of inquiry there are for thinking: the one, that it is and that it is not possible for it not to be, is the path of Persuasion (for it attends upon the Truth), the other, that it is not and that it is necessary for it not to be, this I point out to you to be a path completely unlearnable, for neither may you know that which is not (for it is not to be accomplished) nor may you declare it (Curd fr.2 ll.3-8, pg.45). Parmenides’ subject of inquiry, as show in the fragment, either you must assume that your subject is or it is not. Careful consideration of the statement ‘is not’ shows that it is impossible to point out what does not exist, because it has no attributes or true predicate. Parmenides concludes that if something does not exist, then its non-existence cannot allow for it to come into being or perishing, because if it comes to be, then formally, it previously did not exist. Since we cannot know anything about things that do not exist, coming... ...rmenidean doctrine that substances are uncreated and eternal; however, by positing that there are four creative and two controlling substances, he dubiously maintains that combination and separation, through their endless cycles bring about a whole. If Empedocles were to follow the Parmenidean notion of being absolutely, then his separation and combination would never take place, because each element would be continuously attracted and negated, so that no combination could ever take place.   Ã‚  Ã‚  Ã‚  Ã‚  The Pluralists want to reconcile everything that they perceive through their senses with the Parmenidean idea of an uncreated, eternal, unchanging whole. The problem of such a task lies in the fact that Parmenides’ notion of being goes against everything that our sense experience tells us. With our eyes we see motion and change every day, be it our own self-motion or that of others around us. Furthermore, we experience coming-into-being and perishing through the cycle of birth and death. The Pluralists would had made better progress in extrapolating their own ideas if they would have either sided completely with Parmenides or taken means to discredit his work.

Pros and Cons of exercising Essay

Question 3: Do you agree that exercising is the only way to keep fit and healthy? When it comes to the the phrase ‘a healthy lifestyle’, many people often think of the gym as the only way to keep your body in shape. It seems difficult for them to achieve, and is often seen very negatively. However, exercising is not the only way. In fact, there are many ways to keep fit and healthy, such as having a regular diet, having enough rest, and keeping a positive mindset. Having a regular diet is one of the simplest yet hardest way to keep fit. It requires one to adjust the way they eat, and be cautious of their food intake. However, it may not seem as difficult as it may seem to be. For example, fish and chips seems very unhealthy, but there are ways to make it healthier. Baking it instead of deep-frying it, and just adding a few vegetables to go along with your meal would be an easy way to â€Å"neutralize† your unhealthy food. Make a few simple changes to your diet, and you would soon feel much healthier. To make sure your body has abundant energy to do your daily activities, having enough rest is very important. While you rest, your brain stays busy, and prepares you for the next day. Minimal deprivation of sleep takes a toll on your mood, energy, and ability to handle stress. Adults should sleep betweeen 6-7 hours each day. However, if one is not getting average sleep time, it is best to catch up on weekends where there is no work. Sleep should not be deprived of as it can affect your mental state, energy level and ability to focus. Lastly, having a postitive mindset can help boost one’s morale or motivation spirit. When one is postive about his or her life, he or she would be able to solve obstacles they face with ease as they are able to find ways to solve their problems rather than just dwelling over it. This helps keep both the mind and brain healthy. Rather than thinking that life is unfair, one should appreciate the many things that one has.

What Are Unethical About Stem Cell Research - 956 Words

Introduction In the early 20th century a Russian American named Alexander A. Maximow, established the theory that every cell comes from a precursor cell. Maximow was deeply involved in histology, the study of plant and animal tissue. Being the first to show that blood cells come from a common precursor cell, he is given the most credit in discovering what is known as stem cells (source #7). Stem cells have the ability to change into other cells such as blood, bone, tissue, and muscle cells. Researchers are trying to better understand these foundation cells to create cures and treatments for diseases and injuries. The report will be based on two articles. The next point will evaluate each source. Afterwards, the following information will†¦show more content†¦Funding for the Research in 2005 the Public Health Committee of the General Assembly passed a bill that permits the harvesting of human embryotic stem cells; obtained from the embryo. The bill also allows the harvesting of adult stem cells; found in bone marrow or umbilical cords. President Bush put a limitation on the funds (315.6 million 2005) for creating embryotic stem cells prior to the approval. About 4.4 billion dollars was funded towards stem cell research from California’s taxpayers fund approval; Wisconsin’s commitment towards biotech research and stem cell projects, and New Jersey. (Silverman, pg. CT1) Pros and Cons Silverman introduces The State Representative Lawrence Miller, he gave his testimony about adult stem cells. Miller is a cancer survivor who had adult stem stem cells implanted in him. He said in the article that he was hesitant in sending the bill because of research controversy. He resolve and said, â€Å"why aren’t we doing this† referring to the research. Although Miller rejoiced over the approval, some religious groups denounced the bill because of ethics. Others in the medical community oppose the bill as well. The article zoned in on Dr. Mathews-Roth of Harvard. She gave information about embryonic stem cells that might have discouraged supporters of the bill. She said, â€Å"Embryonic stem cells can form tumors when implanted and run a higher risk of being rejected than adult stem cells when transplanted.† (Silverman, Pg. CT1) Ethical

Second Language Learning - Free Essay Example

Sample details Pages: 4 Words: 1304 Downloads: 10 Date added: 2017/06/26 Category Teaching Essay Type Review Did you like this example? A Brief Literature Review and Self-reflection on the Critical Period Hypothesis Introduction Is there really an ideal age at which second language learning should begin? Is there only a slim chance for an adult learner to master a second language? These thought-provoking questions arising from the Critical Period Hypothesis, as well as the interesting phenomena relating to the hypothesis that occurred during my life as a teacher make it the focus of discussion of the essay. The Critical Period Hypothesis: A highly debatable issue One prominent proponent of the Critical Period Hypothesis (CPH) was Eric Lenneberg (1967), who based his hypothesis on neurological development. He explained that there is a maturation process called cerebral lateralization, during which the brain loses its plasticity as it gradually matures. This process, starts at around two, is supposed to be completed at puberty, after which it is very difficult or even impossible for a learner to successfully acquire a new language. The CPH has been widely discussed in the area of second language acquisition (SLA) and has aroused much controversy. The CPH is most closely linked to the acquisition of the phonological system. As put forward by Scovel (1988), it is not possible for learners beyond the age of 12 to attain a native-like pronunciation though they might be able to master the syntax and vocabulary of a second language. A similar view regarding phonological attainment was propounded by Flege and Fletcher (1992, p.385). They concluded from their studies that a foreign accent first emerges at an age of L2 learning of between 5 and 8 years, which probably implies, in the domain of phonology, that the critical period ends even earlier than what Lenneberg proposed. This coincides with later studies conducted by Krashen (1973), who claimed that lateralization is completed at around age 5. Mark Patkowski (1980) conducted a study on how the age factor is related to the acquisition of linguistic features other than accent. The findings further supported the CPH as the results indicated that the age factor is very important in a sense that it limits the learners development of a native-like mastery of various linguistic features of a second language. Jacquline Johnson and Elissa Newport (1989) also carried out a study relating to the rules of English morphology and syntax and found that those earliest starters got the highest scores on the grammaticality judgement test. Despite some clear evidence t hat supports the CPH, a remarkable research undertaken by Catherine Snow and Marian Hoefnagel-Ho_hle (1978) provided evidence against it. The findings revealed that both adolescent and adult learners could surpass the children learners by making enormous and rapid progress in a wide range of language knowledge. White and Genesee (1996) also revealed in a grammaticality judgement task that late starters are able to achieve near-native proficiency. Robert Dekeyser (2000) done something along the line of Johnson and Newport and found that adult and children might have different way in learning language. Don’t waste time! Our writers will create an original "Second Language Learning" essay for you Create order Insights gained from the CPH: A Self-reflection Taking into account what I have explored from the literature review, I do believe that the evidence for CPH is somewhat mixed, especially when I reflected upon the L2 learners I taught in a secondary school in Hong Kong. In all my years of teaching, I have had a chance to teach a fairly large number of L2 learners who are immigrants from the Mainland. They are of diverse backgrounds in terms of age, gender, financial condition, etc. Very importantly, not all of them started learning English at the same age. There are a few cases which impressed me most. Two girls who first came to Hong Kong at the age of 17 joined my S4 class. Both of them started learning English at the age of around 12 when they were in the mainland. What was so remarkable was that both of them could write very fluently with highly accurate grammar and a variety of sentence patterns. Their performance in writing and reading even surpassed their local counterparts who started taking up English in kindergar ten. This can somewhat be taken as counter-evidence to the CPH. Both girls revealed that they had an extraordinary strong motivation to improve their English and to catch up with their classmates. These social-psychological factors did play a part in their success of L2 acquisition. As discussed in Lightbown (2006), learners beginning at primary school level might not have an absolute advantage over adolescent learners in attaining greater proficiency in the long run. This is especially true when learners, confining to a classroom setting, receive just a few hours of training every week. Interesting enough, despite extra tutorials to improve the girls oral skills, they carried a rather strong foreign accent. In fact, they do speak Cantonese (a different dialect) with an accent, let alone English, a language which is far different from their mother tongue. This seems to support findings demonstrating that it is very unlikely for late starters to attain native-like pronunc iation. Conclusion As an experienced and sensible teacher, I believe that one should not constrain ourselves too much in any one of the theories or models. If a teacher is a true believer of the CPH, it would somehow affect their expectation on their students who are beyond the puberty period. This in turn would also lead to a lower expectation of the students themselves even though they are not aware of the fact that their teachers assume that they have already gone beyond the optimal period of learning a second language. Instead we should be flexible and reflective enough to cater to our learners needs and facilitate their learning regardless of their age. Though I am convinced that the age factor does play a part in affecting SLA, I concern more in how I could adjust my teaching methods to suit the needs of learners at different ages. It is no doubt that the hypothesis should not be oversimplified and overgeneralized and to be indiscriminately applied to our students because second lan guage learning is a really complicated process in which a lot of factors can be intermingled to affect how successfully a person can learn a second language. To conclude, there has been no overwhelming evidence showing that young learners have absolute superiority over their adult counterparts. Despite the difference in the research findings, there seems to be a general consensus that there are a number of factors interacting to affect SLA, and it is possible that late learners might achieve success in SLA, most likely via a different route from children learners, as discussed by Krashen (1975); (Dekeyser 2000). I believe it is also due to this reason that a lot of other factors cognitive, psycholinguistic and socio-cultural that come into place as to how a learner acquire a second language. References Lightbown, P. Spada, N. (1993). How Languages Are Learned. Oxford University Press Robertson, P. (2002) The Critical Age Hypothiseis, The Asian EFL Journal (On-Line) https://www.asian-efl-journal.com/marcharticles_pr.php Flege, J.E. and Fletcher, K.L. 1992, talker and listener effects on degree of perceived foreign accent. Journal of the Acoustical Society of America 91, 370-89. Daniels, D. and Moos, R.H. (1990). Assessing Life Stressors and Social Resources among Adolescents: Applications to Depressed Youth. Journal of Adolescent Research, 5, 268-289. Erikson, Erik H. (1980). Identity and the life cycle. W.W. Norton Company, Inc. Hall, J.A. (1987). Parent-Adolescent Conflict. An Empirical Review. Adolescent, 22, 767-789. Montemayor, R. (1986). Family Variation in Parent-Adolescent Storm and Stress. Journal of Adolescent Research, 1, 15-31. Ormrod, J.E. (2000). Educational psychology: developing learners (3rd ed.). London: Prentice Hall. Rice, F.P. (1993 ). The adolescent: Development, relationships, and culture (7th ed.). Boston: Allyn and Bacon. The concept of critical period was initially introduced by Wilder Penfield and Lamar Roberts (1959). As summed up by Hong and Morgan (2005), they proposed that the relatively higher plasticity of a childs brain, as compared to that of an adult, enables a child to learn a language more easily.

Beowulf vs. Eaters of the Dead - 1645 Words

Great Literary Epics of the Past The Roman conquest of England in 43 AD, coinciding with the introduction of Christian values, the alphabet and writing utensils was the start of a new Era. Missionaries sent by the Roman Pope to England influenced the pagan values of the native Britanie, as exemplified in their literature. Anglo-Saxons, whom contributed the features of a literary Epic, were torn between pagan beliefs and Christian values as their predecessors had been. The first literary Epic, Beowulf, illustrates the struggle between these two ideologies, as well as contributes the sought after values of heroism. The Eaters of the Dead also demonstrates this struggle between cultures, playing off Beowulf in theme. Excalibur, the Arthurian†¦show more content†¦The story line soon takes off when the reader finds Fadlan is forced to play the role of the thirteenth warrior in a quest to destroy the terror that plagues these people. Being a common man of middle age, the protagonist fears for his life so refuses the position of greatness- only to have it thrust upon his as Beowulf did. I protested I was not a warrior. Verily I made all the excuses and pleadings that I could imagine might have effect upon this rude company of beings. I demanded that the interpreter convey my words to Buliwyf, and yet he turned away and left the hall, saying this last speech: ‘Prepare yourself as you think best. You shall leave on the morning light. As weeks pass Fadlan is forced to do battle with the Northerners, for, as he sees it, either course of action may end in death, so why not go forth in battle. Growing more accustom to the brutish ways of the Vikings, Fadlan soon sinks into their lifestyle, feeling proud of himself in battle, as well as partaking in the Northerners- once discomforting Ââ€" openness of sexual pleasures. Though adapting to much of the Viking way of life, Fadlan continues to express his fears openly, only to overcome it faced with his most feared obstacle- heights. Also it is true that I was much aggrieved at the prospect of climbing down the cliff. Verily I felt in this manner: that I should rather do any action upon the face of the earth, whether to lie with a women in menses,

Compare Theodore Roosevelts Square Deal with Woodrow free essay sample

Though Wilson seemed to have many more acts in ACH category, mostly economic), he only acknowledged these few areas, unlike Roosevelt who acknowledged a whole array of areas such as labor, economy, politics, consumer protection, and environmental conservation. The Progressive Era was the time period after the depression of the sass and before World War l. During this time the united States was going through a period of social change and political tumult.The American Society embarked on a Journey of many reforms as a response to the diverse tensions and pressures presented by industrialization, urban growth, and ethnic tension. The roots of this reform clearly lay in the depression of the 1 sass (1893 to 1897). The depression traumatized the problems in society, and raised the possibility of more violent upheavals if reform was not instituted. Major areas needing reform were poor public facilities, tax favoritism, corruption, environmental reform, and urban reform.This was a period of self-examination and renewal; it was a healthful contribution to the nations history books. Even if the new regulatory agencies direct primaries, municipal reforms and conservation legislations may not have made all wrong things right, they were able o make some significant change for the better. These new laws and commissions act had alleviated many citizens and had established the principle of governments responsibility for the general welfare of the various elements of the social order.The progressive era was a further demonstration of the united States success with democratic capitalism; it showed the society ability to change itself for the better without a revolution. The most important legacy of the progressive era was the example it set for gradual measured reform. (Gould, 1-10) During the Progressive Era, there were two prominent Progressive Presidents each tit his own policy for progression out of the nasty and crude elements that plagued politics, the economy, and society In general. Theodore Roosevelt was the first Progressive President; he was renowned for bei ng a strong president with a strong personality.He was outraged at the Injustices experienced as a small business oppressed by a big business, or a worker by a boss, or the forests by the Industrial greed of this era. Roosevelt was sympathetic for the Individual who suffered the sympathetic for those without the opportunity to speak up for their rights, but rather is love for Justice was what fueled him more. He sought to reform these problems under his policy known as the Square Deal. The purpose of the Square Deal was expressed in this statement of his the labor unions shall a square deal, and the corporations shall have a square deal. Essentially he meant that there should be equality of opportunity, and Justice to each individual, or corporation despite their background, status or size. The second major Progressive President was Woodrow Wilson. He wasnt known for a very strong personality rather he was renowned for his strong sense of conviction. Wilson believed that national identity and character branched out from the liberty of petty capitalists to release their energies and develop the economy. He felt the emergence of these new monopolistic style trusts were endangering this process by cutting of entire industries to newcomers.He also felt that members of certain big businesses and certain unidentified political bosses had formed a small oligarchic alliance; this small group of men controlled the government and the economy, while the true freedom began to slide away. Thus his policy was known as New Freedom. Under the New Freedom he sought to store power to competition among small corporations rather that regulate large monopolies. Roosevelt Square Deal and Willows New Freedom were policies that they used to help improve American economy, society and politics.However Roosevelt tried to reform many areas, Willows focus of reform was mostly economic. (Gould, 97-100) (Staunchness, 62,81 16, 127) (Whitehall, 162) A major part of both policies was the breaking up and regulating of trusts. Roosevelt never wanted to dissolve or destroy the large corporations rather he saw them as necessary parts of American life. However he felt that these companies must be mounded tightly to strict moral standards. Roosevelt followed the idea of rules of reason which was the policy of busting bad trusts, leaving good ones alone.He was the person who would decide which trusts were good and which ones were bad. He earned the name of trustees when he had filed a suit against the Northern Securities Company (which was followed by 43 other cases). This was Roosevelt first case, in which he filed a suit against a large corporation for the purpose of trust busting. The Northern Securities Company was a large holding company that was formed by railroad and banking interests. In 1902 Roosevelt trust busted them by claiming that they violated the Sherman Anti-Trust Act in holding money against the public good, thus the court ruled to dissolve the company.In two later cases he also attacked the Standard Oil of New Jersey and the American Tobacco Company. He left many of the larger companies that were serving the public good alone, but he had dissolved many other large companies that were monopolistic and never really served the interest of American well being or economy. In 1903 he persuaded Congress to form a Department of Commerce and Labor. Along with a Bureau of Commerce, which old investigate and regulate business practices. In the 1905 case of Swift vs.. U. S. The Interstate Commerce Act of 1887 was further strengthened under Roosevelt.He wanted to strengthen it because he wanted to make railroad legislature stronger, especially for the farmers who were at the mercy of railroad middlemen. Thus he wanted to strengthen the Interstate Commerce Commission (ICC). Under the Oilskins Act (1903) he was able to make rebates illegal. Under the Hepburn Act (1906) the ICC was given the power to inspect books, fix maximum rates, disallow free passes to legislators, put burden of proof on business instead of ICC, and allow exultation of pipelines. Wilson felt that he stood for regulated competition while Roosevelt stood for regulated monopoly. The Federal Trade Commission Act, which as instituted to promote free and fair trade competition created the Federal Trade Commission. It investigated economically unfair business practices and it regulated and attempted to rectify these practices. The commission regularly generated statistics of economic and business conditions, and offered them to the public. Another Major step towards trust busting under Wilson was the Clayton Antitrust Act. The Clayton Antitrust Act was designed to clarify the Sherman antitrust Act in terms of new economic issues that had arisen in this new era.The practices such as local price-cutting and price discrimination were made illegal. Both Wilson and Roosevelt attempted reform of he corporations, however Wilson attempted to totally break up large trust, while Roosevelt felt they were necessary if they had and special benefits towards society. (Gould, 97-100)(Conclusions, 62,81 , 1 16, The Square Deal and New Freedom also addressed the issue of taxes and tariffs, with a keen interest in better outcomes for the average person rather than the wealthy en. During Roosevelt Presidency the tariffs were generally high.Under Wilson a prominent tariff was the Underworld-Simmons Tariff, which reduced the previous tariffs to about 29 percent. It also included a graduated income tax, which later was made legal via the constitution as the sixteenth amendment, this made up for monetary loss. Wilson, noticed that it followed his principle of New Freedom, thus he heavily advocated it. The Supreme Court originally declared the income tax, as unconstitutional, however it was later ratified as the Sixteenth Amendment. This new rower was first used in the Tariff Act of 1913, which had set the tax of corporate income at 1 percent.It also levied a 1 percent tax on all rich families. The Income tax has been greatly increased, as the tariffs have been lowered. The tariff and tax reform was greater during Willows Presidency than Roosevelt Presidency. (Gould, 97-100) (Staunchness, 62,81 16, 127) (Whitehall, 162) One of the most notorious aspects of the Industrial Revolution was the increasingly worsening condition for laborers within the work place, and also deprivation of certain rights (fair wages and work hours). During the Roosevelt Presidency a major labor relation movement was the 1902 Coal strike.The strike was led by John Mitchell led 140, 000 out on strike for 20 percent pay raise, 8 hour day, and union recognition. Roosevelt decided that he would arbitrate the dispute, the workers agreed to this, however the owners did not. Roosevelt finally threatened to use the military and take over the mines, and the owners finally agreed to let Roosevelt arbitrate. In March of 1903 Roosevelt made a settlement, the workers and owners agreed on a 9-hour day, a 10 percent raise, but no union recognition. However these coal companies were also encouraged to raise the prices to compensate for the costs of raises.This was the first time that the federal government didnt arbitrate on the side of management; rather it treated both sides as equals. Labor reform was also a part of the New Freedom Policy. The Keating-Owen Act of 1916 (inspired by The Bitter Cry of Children by John Spares) prohibited the interstate transportation of products made by children (attempting to induce the practice of keeping kids under 14 out of the labor force). Though law was never passed it showed growing recognition for the need of hill labor laws and regulation.