Comparing the 1962 Version of The Manchurian Candidate with the 2004 Essay

Comparing the 1962 Version of The Manchurian Candidate with the 2004 version - Essay Example The movie-making industry is inseparable from the political and historical conditions, in which it operates. Even fantastic movies and horrors cannot escape the dramatic influence of historical and political realities. The Manchurian Candidate was first created in 1962. Featuring Frank Sinatra, the movie was a compound product of multiple historical, social, and technical influences. The fear of Communism, the rapid spread of McCarthyism, and the Cold War altogether contributed to the development of a sophisticated vision of war, which, taking place thousands of miles from the American continent, profoundly alters the American political landscape. On the social background, an evolutionary nature of a social role a woman plays in the society is evident. At first, in the version of 1962 year, the main character was a manipulative woman, but there was no essential political influence of this heroine. In the version of 2004 year, this character becomes a Senator. Therefore, it is clearly seen that social factor has contributed greatly to the social accents set in the new version of the film. Moreover, there is a lack of sensual transfer of intimate relations between the main characters. Thus, for example, Lansbury’s character kissing Shaw inspires the audience and creates a romantic atmosphere. In the modern version there is no such kind of a romantic aura between the characters. Political Differences-The concept of â€Å"fear† is integrative for both films. Two great powerful machines that are consuming contemporaries are presented with the same powerful manner: in the first version of the film there is an atmosphere of fear in the face of communism and in the second film the characters are afraid of being absorbed by a powerful corporate machine. Therefore, it is evident that historical events and periods of films’ creation influenced the main conceptual framework of both film versions. The influential and powerful factor of fear in the face of communism (in 1962 version) was substituted by another fear factor in the version of 2004. Another political factor that is rather controversial in the modern version is the way assassination is represented. A great emphasis is made on a â€Å"programmed nature† of assassinator’s mind. At this point we can see an intricate interconnection between political and technological factors. This i nterpretation of assassination is justified in the modern version as it is strongly backed up by the modern technological developments. Moreover, another explanation is provided. The matter of natural/unnatural changes of human behavior is explained in terms of technological advancements or as a result of mental disorders. This director’s intention can be interpreted in the following way: whether modern technologies are able to re-program human mind or not, the latter would be either way perverted by his own psycho. The Manchurian Candidate (1962) is probably one of the brightest and memorable products of the American moviemaking industry. Featuring Frank Sinatra, The Manchurian Candidate is a movie, where â€Å"the stepson of a presidential candidate turns out to have been a prisoner of war who underwent interrogation at the hands of Chinese communists† (Delgado 23). The soldier is brainwashed and programmed to assassin a Presidential Candidate.

World Literature Essay Example | Topics and Well Written Essays - 1000 words - 1

World Literature - Essay Example The Kite Runner begins with the protagonist, Amir, telling us that the past cannot be forgotten. An instance has been haunting him for the past twenty-six years. As a twelve year old he witnesses Assef, a local bully and his friends, attack and rape Hassan at the annual kite fighting tournament. He stands watching helplessly, unable to rescue of his friend. He commits the ultimate sin of running away leaving Hassan at the mercy of the bullies. After this incident he is unable to face Hassan. Hassan’s presence in the house becomes a constant reminder of his guilt. He feels one of them has to leave the house if he has to forget the incident. Amir frames Hassan for theft and Hassan goes away. With the war striking Afghanistan, Amir and his father are forced to flee. They begin a new life in America. Amir chooses to settle in America as it "had no ghosts, no memories, and no sins" (Hosseini (2003), Kite Runner). Amir becomes an author and marries Soraya. However, his peaceful life is shattered when an old friend, Rahim Khan calls him. Rahim tells him that Hassans son, Sohrab is in Kabul living a life of poverty in an orphanage. He must go to Kabul to save him. This is when his past sins come back to haunt him. He is once again reminded of Hassan and "Those thorny old barbs of guilt bore into me once more, as if speaking his name had broken a spell, set them free to torment me anew" (The Kite Runner). As David Kipen (2003) says â€Å"he sees a chance to redeem himself from the secrets that have left him psychically stranded between Afghanistan and the United States. â€Å" This and Rahims words "There is a way to be good again" (The Kite Runner) become focal points for the rest of the book. According to Damini Raleigh (2007) â€Å"Sometimes we can just catch the ghosts of our past, capture them and undo our future of guilt. Sometimes redemption is just a step away. Sometimes it’s never too late to come back and sometimes there is a

Death penalty Essay Example | Topics and Well Written Essays - 1250 words - 3

Death penalty - Essay Example But imprisonment without parole should serve as an alternative to the death penalty, and should be given enough and serious consideration. The death penalty should be stopped and must be prohibited (Pojman and Reiman 72). This essay’s main agenda or main aim is to support the argument that the death penalty should be abolished. In the research, there will be proofs to support that use of the death penalty as a form punishment does not deter crime. Also the research will look at the origin of the use of the death penalty as a form of punishment, and will give the reasons why this form of punishment should be stopped. The death penalty or capital punishment is a legal process whereby a person is sentenced to death for a crime he or she has committed. The actual process of killing the person is called execution. The death penalty tends to brutalize and disregard society and thus it should be completely banned (Johnson and Zimring 289). The death penalty was first used in Babylon for various crimes at least 3700 years ago, and was also used in many other parts in the world. Some countries imposed it for terrible crimes, while others imposed it on very minor offenses, for example under the Roman law of the twelve tablets in the 5th century BC, the death penalty was administered for crimes like publishing of insulting songs and also disturbing the peace of the city. Another example is under the Greece Draconian legal code in the seventh century, where the death penalty was a punishment for every crime (Kronenwetter 11). In a number of ancient societies, the death penalty was used to punish people who committed crimes against the community and religious leaders. The death penalty also served as punishment for other crimes such as robbery, rape, and murder committed against individuals. Rather than being conducted by the legal systems, punishments were carried out by families, clans, and victims in public. According to Kronenwetter, â€Å"execution

Oprah Winfrey Essay Example for Free

Oprah Winfrey Essay Oprah Gail Winfrey is one of the most influential people today despite coming from a broken family and being a rebellious teen in her adolescence (Mowbray 2003). Oprah remains as a symbol of success in the United States and all over the globe as she has been included in the richest African Americans of the 20th century (Noon 2007) and as one of the most philanthropic African American of all time. Oprah started the Angel Network in the year 1998, a program that encourages other people to help those who are underprivileged. To this day, Oprah’s Angel Network has raised over 51,000,000 dollars. 100 percent of the funds generated go directly to various charity programs as Oprah takes care of administrative costs in running the charity. As mentioned earlier, Oprah was included in the list for America’s 50 most generous philanthropists as she has contributed about 250 million dollars to several charities and fundraising programs including a 10 million dollar donation to the victims of Hurricane Katrina. Oprah even visited South Africa in order to raise the people’s awareness regarding the plight of children afflicted with AIDS and stricken with poverty through her show Oprah’s Christmas Kindness. She appealed to televiewers to donate for these children and people around the globe heeded her call and donated over 7,000,000 dollars. Oprah also invested her time and money for the Oprah Winfrey Leadership Academy for Girls in Johannesburg, South Africa which initially started as Oprah’s promise to Nelson Mandela. The academy aims to provide little girls with a safe place to nurture their dreams allow them to be equipped with the necessary education they would need to succeed. Oprah is certainly considered as a god sent to our society as she exemplifies genuine kindness and concern for the underprivileged people and does not hesitate to lend her time and effort to make a positive change in other people’s lives.

Properties of Phagraphene via Hydrogenation and Fluorination

Properties of Phagraphene via Hydrogenation and Fluorination Modulation of electronic and mechanical properties of phagraphene via hydrogenation and fluorination Donghai Wu ab, Shuaiwei Wang ab, Jinyun Yuanab* Baocheng Yang ab, Houyang Chenc* a Institute of Nanostructured Functional Materials, Huanghe Science and Technology College, Zhengzhou, Henan 450006, China b Henan provincial key laboratory of nanocomposite and application, Zhengzhou, Henan 450006, China c Department of Chemical and Biological Engineering, State University of New York at Buffalo, Buffalo, New York 14260-4200, USA ________________ Abstract: Recently, a new carbon sheet, phagraphene, was proposed by theoretical calculations [Nano Lett. 2015, 15, 6182]. In this paper, the hydrogenated and fluorinated phagraphene (denoted as H-PHA and F-PHA) sheets have been systematically studied using first-principles calculations. The results of formation energy, ab initio molecular dynamics, phonon dispersion and elastic constants confirm that the modified phagraphene sheets are thermodynamically and dynamically as well as mechanically stable. We find that hydrogenation or fluorination is an effective way to modulate the bandgap, and we also find that adsorption-induced semimetal-semiconductor transition and adsorption-induced semimetal-insulator transition occur. Configuration-dependent bandgap for partially H-PHA and configuration-independent bandgap for fully H-PHA are determined. Adsorption-ratio-dependent bandgaps of H-PHA and F-PHA are also identified. Calculated bandgaps from HSE06 and PBE functionals of fully H-PHA ar e larger than those of F-PHA, and they are comparable to thehydrogenated/fluorinated penta-graphene while they are larger than their corresponding graphene. Dependence of bandgaps of fully H-PHA and F-PHA on the tensile strain is investigated, and our calculations show that an insulator-semiconductor transition occurs upon increasing the tensile strain. Our results also determined that the mechanical properties are controllable by using hydrogenation and fluorination. The calculations of Youngs modulus and Poissons ratio reveal the functionalized phagraphene sheets possess suitable stiffness and resistance to volume deformation, and both are smaller than the pristine phagraphene. 1. Introduction Two-dimensional (2D) carbon-based materials have been attracting great attention due to their fascinating mechanical, thermal, electronic, optical and magnetic properties.1-11 In particular, graphene is the most representative example. Since synthetized by Novoselov et al.6 in 2004, graphene has been extensively studied for its robust stability,12 high crystal quality,13 captivating mechanical and electronic as well as thermal properties.14-18 The covalently bonded honeycomb lattice with perfect hexagonal symmetry of graphene plays a crucial role in forming Dirac cones,19 which gives graphene massless fermions, resulting in the anomalous quantum Hall effects,20 ultrahigh carrier mobility21 and other properties.22, 23 Recently, a new carbon sheet, phagraphene,19 composed of rings containing five, six, and seven carbon atoms, was proposed by theoretical calculations. It can be considered as a defective graphene.24 This planar carbon allotrope is slightly more unstable than pristine graphene while energetically more favorable than other carbon allotropes.19 The notable stability benefits from its sp2-hybridization and dense atomic packing structure.25 Zhang et al.19 have proven that the electronic structure of phagraphene has direction-dependent Dirac cones, which are robust against external strain with tunable Fermi velocities. This unique performance makes the phagraphene an advanced material for numerous applications in photoelectric technology. However, like graphene, the phagraphene suffers a major drawback of zero bandgap and rather robust gapless state, limiting its potential applications. In order to overcome this disadvantage, we use hydrogenation and fluorination to modulate its bandgap in this paper. Thanks to the surface unsaturated C-C dangling bond,26 the chemical modification by adsorbing non-carbon atoms on the surface is an effective way to create a bandgap and tune the electronic, magnetic and mechanical properties of graphene.14, 24, 26-32 Hydrogenation is not only the simplest and manageable adsorption but also the generating hydrides are promising hydrogen storage materials in energy field.33, 34 The fluorine atoms with ultrahigh electronegativity are adsorbed on the graphene surface forming fluorinated graphene, which have been investigated experimentally and theoretically.14, 35, 36 After adsorbing such atoms, the forming C-H and C-F bonds could give rise to the carbon atoms transforming their hybridizati on state from sp2 to sp3, 33 correspondingly, the structural and electronic properties would undergo dramatic alterations. In this work, by employing first-principles calculations, the effect of hydrogenation and fluorination on the bandgap opening of phagraphene sheet is examined. After hydrogenation or fluorination, the bandgap of phagraphene could be opened sizably, changing its electro-conductivity from Dirac semimetal to semiconductor or from Dirac semimetal to insulator. The structural stability and mechanical properties of the modified phagraphene sheet are also investigated. 2. Computational details All the first-principles calculations and abinitio molecular dynamics (AIMD) were carried out by density functional theory (DFT) with the projector augmented wave (PAW) method and performed by the Vienna abinitio simulation package (VASP)37 . The 2D periodic boundary condition was adopted and a vacuum space of 20 Ã… along the perpendicular direction of the phagraphene sheet was included in order to avoid the interactions between adjacent layers. The generalized gradient approximation (GGA) of Perdew, Burke, and Ernzerhof (PBE)38 was applied as the exchange-correlation functional in most of the calculations. Meanwhile, to accurately calculate the band structures, the hybrid Heyd-Scuseria-Ernzerhof (HSE06)39 was introduced. The Brillouin zone (BZ) was sampled using 2à Ã¢â€š ¬ ÃÆ'- 0.01 Ã…Ã ¢Ã‹â€ Ã¢â‚¬â„¢1 Monkhorst-Pack40 k-point mesh density, and the plane-wave basis set with cutoff energy of 600 eV was adopted. The total energy difference of 10à ¢Ã‹â€ Ã¢â‚¬â„¢5 eV and forc e tolerance of 10à ¢Ã‹â€ Ã¢â‚¬â„¢2 eVà ¢Ã¢â€š ¬Ã‚ ¢Ãƒâ€¦Ãƒ ¢Ã‹â€ Ã¢â‚¬â„¢1 were used for the convergence criteria of geometric optimization and self-consistent field. The phonon properties were calculated by the Phonopy package41 with force constants obtained by the finite displacement method.42 3. Results and discussion 3.1 Structural properties Figure 1 displays the structure of phagraphene19 together with its hydride and fluoride. The hydrogenated or fluorinated phagraphene (denoted as H-PHA or F-PHA) sheet is obtained by adsorbing hydrogen or fluorine atoms on both sides of the plane. For fully H-PHA and F-PHA, the ratio of C : H/F is 1 : 1. After optimization, the structures of both fully H-PHA (Figure 1c) and fully F-PHA (Figure 1d) are greatly distorted compared to pristine phagraphene (Figure 1a), resulting in low symmetry with a space group of P21/m (No. 11). The 5-6-7 carbon rings no longer remain in the same plane and become crumpled. The buckling height hb (i.e. the height between the bottom and top carbon layers) of fully H-PHA (0.856 Ã…, see Table 1) is larger than that of F-PHA (0.704 Ã…), and they are much larger than those of hydrogenated/fluorinated penta-graphene (0.42/0.40 Ã…) and graphene (0.46/0.49 Ã…).12 The calculated C-C bond distances of pristine phagraphene in Table 1 are in agreement wi th previous calculations,19 indicating the computational method is valid. All the C-C bond distances in fully H-PHA and fully F-PHA are enlarged compared to the pristine phagraphene, and are close to that of 1.546 Ã… in diamond43 while larger than that of 1.42 Ã… in graphene.1 These facts indicate the C-C bonds of phagraphene transform from the sp2-hybridization double bond to the sp3 single bond by hydrogenation or fluorination. The C-C bonds of fully F-PHA are longer than those of fully H-PHA, which can be explained by the depopulation of bonding orbitals between carbon atoms.27 The depopulation of these bonding orbitals stems from the electron transfer between carbon and hydrogen/fluorine atoms. The C-C bonds (C4-C4 in Figure 1) connecting the adjacent 5- and 7-carbon rings are enlarged to a greater extent than others, which is because of the repulsive interactions and steric effects between the adjacent two H/F atoms in the same side of phagraphene. The C-H and C-F bond di stances are approximately 1.11 and 1.38 Ã… (Table S1), approaching to the typical hydrocarbon and fluorocarbons compounds.44 Similar structure distortions and C-C bond elongation are found in hydrogenated/fluorinated penta-graphene and graphene.12, 26, 44 3.2 Stability analysis To investigate the stability of H-PHA and F-PHA, the binding energy Eb and formation energyEf are calculated (definitions of Eb and Ef are given at Section S1 of Supporting Information). The values of Eb are -2.540 and -2.977 eV/atom for fully H-PHA and fully F-PHA (see Table 1), respectively, implying strong interactions between C and H/F. A possible explanation of the strong attractive interactions between C atoms (of phagraphene) and H/F atoms is that, by adsorbing H/F atoms, the C-H/C-F bonds are formed, and the C-C bonds of phagraphene elongate greatly, which could partially release the stress imposed by the 5-6-7 carbon rings.12 Another important factor for synthesis is the formation energy, which applies to measure the stability against molecular desorption from the surface.44 The negative Ef (-0.276 eV/atom for fully H-PHA and -1.615 eV/atom for fully F-PHA) means that the surface modification is exothermic process and the H-PHA (or F-PHA) has lower energy than that of pristi ne phagraphene and H2 (or F2) molecules. The Eb and Ef of hydride are larger than those of fluoride, which are in accordance with similar systems of hydrogenated/fluorinated graphene (-2.48 eV > -2.86 eV)27 and penta-graphene (-3.65 eV > -4.22 eV).12 It is noticed that the Eb of fully H-PHA and fully F-PHA are close, whereas the Ef of fully H-PHA and fully F-PHA have huge difference. This is because of large difference in the dissociation energy of H2 and F2 molecules.27 The thermal stability is also important for H-PHA and F-PHA and is evaluated using the AIMD simulations with a 2 ÃÆ'- 2 ÃÆ'- 1 supercell and a time step of 1 fs for 5000 steps at room temperature (300 K) and 1000 K. Temperature (T) and total energy (Et) as functions of simulation time are plotted in Figures 2 and S1. T and Et converge to constants and the fully H-PHA and F-PHA keep their integrated structures during the AIMD simulations at the setting temperature. These facts demonstrate that hydrogenated or fluorinated phagraphene not only possesses robust thermal stability at room temperature, but also is resistant to high temperature such as 1000 K. In order to examine the dynamic stability, the phonon dispersion curves along the high symmetry points in the BZ and the corresponding phonon density of states (PDOS) are calculated  (Figure 3). No imaginary frequencies are found for both fully H-PHA and fully F-PHA, demonstrating that they are dynamically stable. There are three obvious acoustic modes in the bottom of the phonon spectra for the two structures, and the double degenerates arise along the XZ path of the BZ. These features are similar to the pristine phagraphene,19 graphene45 and its derivatives.12 From the PDOS, one can see that the H-PHA has a tremendous phonon gap of approximately 40 THz, while it is small for F-PHA (about 3 THz). The vibration frequency is inversely proportional to the effective atomic mass,12 thus the larger phonon gap of H-PHA than F-PHA may be attributed to the much lighter atomic mass of hydrogen than fluorine atom. Meanwhile, the narrow high frequency zone around 87 THz in Figure 3a is c orresponding to the C-H bond vibration modes of H-PHA, in accordance with the case of hydrocarbon.46 These C-H stretching modes are infrared active and useful in characterizing this compound.44 The low frequency range from 5 to 10 THz in Figure 3b mainly consists of the phonon modes of C-F bonds. The middle frequency range is dominated by the motion of C atoms. The C=C double bonds were broken by hydrogenation/fluorination, resulting in the disappearance of C-C vibration modes in the region of 40-50 THz for pristine phagraphene.19 3.3 Electronic structures In order to explore the electronic properties and bonding features, the band structures and density of states (DOS) of partially and fully hydrogenated/fluorinated phagraphene are calculated using both PBE and HSE06 functionals. As an example for partially H-PHA, 60% hydrogenation of phagraphene is chosen and four stable configurations (see Figure S2) are designed. The band structures of these configurations are shown in Figures 4 and S3. One can see that the band structures disperse greatly to single band, leading to the sharp peak appearing in the DOS at the EF. Meanwhile, a sub-bandgap located below or above the primary bandgap was observed. From calculations with PBE functional (Figure S3), the bandgaps of the four configurations vary from 2.65 eV (Figure S3a) to 1.72 eV (Figure S3b) to 0.93 eV (Figure S3c) to 0 (Figure S3d). The PBE functional usually underestimates the bandgap of materials.12 To obtain a more accurate Egap, the hybrid functional HSE06 is adopted. The calculated bandgaps with HSE functional in Figure 4 are 3.70 eV, 2.46 eV, 1.56 eV and 0.54 eV for the four configurations. Thus, one can conclude that the bandgap of partially hydrogenated phagraphene depends on configuration and adsorptio n-induced semimetal-semiconductor transition occurs. Such a functionalized 2D material with a proper bandgap has promising applications in optoelectronics and microelectronics.29, 47 The band structures and DOS of fully H-PHA and fully F-PHA are shown in Figures 5 and S4. From calculations with PBE functional (Figure S4), fully H-PHA and F-PHA have direct bandgaps of 4.29 eV and 3.23 eV, respectively. To examine the influence of configuration on the electronic properties, another four configurations of fully hydrogenated phagraphene (see Figure S5) are taken into account. The calculated band structures of the five configurations (Figures S4a and S6) are almost the same and the bandgaps are approximately 4.29 eV, indicating that the Egap of fully hydrogenated phagraphene is independent of the configuration. Similar behavior was found for fully hydrogenated graphene.27 We also calculated the band structures and DOS with HSE06 functional (Figure 5), and obtained that Egap for fully H-PHA and fully F-PHA are 5.37 and 4.98 eV, respectively. These values are comparable to the Egap of hydrogenated/fluorinated penta-graphene (5.35 eV and 4.78 eV) while they are larger th an those of corresponding graphene (4.97 eV and 4.74 eV).12 Obviously, the Egap of F-PHA is smaller than that of H-PHA. Similar results are found in cases of hydrogenated/fluorinated graphene26, 27 and penta-graphene.12Compared to the pristine phagraphene with zero bandgap, the surface modification via hydrogenation or fluorination can effectively tune its electronic structure from semimetal to insulator. Analysis of the partial DOS (Figure 5) reveals that, for H-PHA, the electronic states near the Fermi level (EF) are primarily originated from the C atoms, while they are dominated by both C and F atoms for F-PHA. Additional, from Figures 4 and 5, one can conclude that the bandgaps of H-PHA and F-PHA depend on the adsorption ratio of H and F atoms. We also examine the effect of strain on the band structures. The obtained stress-strain curves of fully H-PHA and F-PHA under biaxial loading (Figure S7) show that their fracture strains are 0.17 and 0.13, respectively. By changing the biaxial tensile strain, the bandgaps of fully H-PHA and F-PHA remain the direct gaps (Figures S8 and S9). Furthermore, upon increasing the biaxial tensile strain, the bandgap of fully H-PHA increases first and then decreases (Figure 6a), whereas the bandgap of fully F-PHA decreases monotonically (Figure 6b). These behaviors indicate that bandgaps depend on the strain. Strain-dependent bandgaps of other 2D materials were also determined previously.48-52 More interestingly, our calculations show that the bandgap of H-PHA reduces from 5.62 eV (ÃŽÂ µ = 0.10) to 4.42 eV (ÃŽÂ µ = 0.17) and the bandgap of F-PHA decreases from 4.98 eV (ÃŽÂ µ = 0) to 3.01 eV (ÃŽÂ µ = 0.13), indicating that an insulator-semiconductor transition occurs with the tensil e strain changes. To visually describe the electronic structure of fully H-PHA and F-PHA, we calculate the charge density. As shown in Figure 7, the charges are redistributed after hydrogenation or fluorination. Compared to the charge densities of C=C bonds in pristine phagraphene (see Figure S10), the charge densities of C-C bonds in H-PHA and F-PHA are reduced. For H-PHA, the shared charges donated by hydrogen are mainly located between the carbon and hydrogen atoms. For F-PHA, a large number of charges are focused on the fluorine atoms. This difference is a consequence of the different electronegativity of hydrogen and fluorine. For a selected element, its attraction of electrons becomes stronger with higher electronegativity.53, 54 The electronegativity increases gradually from hydrogen to carbon to fluorine.53 Thus the charge transfer is from hydrogen to carbon atoms in H-PHA while it is from carbon to fluorine atoms in F-PHA, which is consistent with other hydrocarbons and fluorocarbons.12, 55-5 7 Moreover, the charge density between H and C is lower than that between F and C, implying the weaker C-H interaction than C-F. The Mulliken population analysis58 shows that the transfer charge amounts are approximately 0.22 and 0.33 electrons for H-PHA and F-PHA, respectively, manifesting the weaker bond strength of C-H than that of C-F. 3.4 Mechanical properties Since the ultrathin 2D phagraphene as well as its derivatives is susceptible to external influences, including mechanical deformation,24 it is necessary to develop an in-depth understanding of their mechanical properties for practical application. The elastic constants are calculated (definitions are given at Section S2 of Supporting Information) and the obtained results are tabulated in Table 2, together with the existing reference data24 for comparison. All the elastic constants of fully H-PHA and fully F-PHA satisfy the mechanical stability criteria of C11C22 à ¢Ã‹â€ Ã¢â‚¬â„¢ C122 > 0 and C66 > 0 for 2D sheets,3, 59 indicating that they are mechanically stable. The in-plane Youngs modulus (E) and Poissons ratio (ÃŽÂ ½) can be derived from the elastic constants using the formulas of E = (C112 à ¢Ã‹â€ Ã¢â‚¬â„¢ C122) / C11 and ÃŽÂ ½ = C12 / C11.24 The E of fully H-PHA and F-PHA are 151.3 and 176.3 N/m (see Table 2), respectively, which are consistent with the results from the stress-strain curves (149.2 and 178.5 N/m for fully H-PHA and F-PHA, respectively). The Poissons ratio ÃŽÂ ½ of fully H-PHA and F-PHA are 0.078 and 0.152, respectively. Because the larger E implies the stronger stiffness and the larger Poissons ratio signifies the stronger incompressibility,24 the F-PHA has better stiffness and resistance to volume compression than the H-PHA, which may ascribe to the stronger C-F bonds than C-H bonds. Compared to pristine phagraphene, the E and ÃŽÂ ½ of H-PHA and F-PHA are significantly reduced. Such reduction may be related to their different charge density distribution and bond nature.12, 24 4. Conclusions In summary, we systematically study the structure, stability, electronic and mechanical properties of hydrogenated and fluorinated phagraphene sheets. Our results show that H-PHA and F-PHA are thermodynamically and dynamically as well as mechanically stable. The binding energy and formation energy of fully F-PHA are smaller than those of fully H-PHA, implying the stronger stability of F-PHA than H-PHA. After hydrogenation or fluorination, the bandgap of phagraphene is opened properly, resulting in an adsorption-induced semimetal-semiconductor transition or adsorption-induced semimetal-insulator transition. Strain-induced insulator-semiconductor transition is also identified. Our band structures demonstrate that bandgap of fully H-PHA is insensitive to the configuration whereas the bandgap of partially H-PHA is sensitive to the configuration. Adsorption-ratio-dependent of H-PHA and F-PHA is also determined. The obtained bandgaps from both PBE and HSE06 functionals of fully F-PHA are s maller than fully H-PHA. The charges are transferred from hydrogen to carbon atoms in the fully H-PHA while it is from carbon to fluorine atoms in the fully F-PHA. The positive Poissons ratios of fully H-PHA and F-PHA manifest that they can well resist the volume deformation.Both the Youngs moduli and Poissons ratios of the two phagraphene derivatives are significantly smaller than the pristine phagraphene. This investigation suggests that hydrogenation or fluorination is an effective strategy to modulate the electronic and mechanical properties of phagraphene for its possible applications in nanoelectronics. Acknowledgements The authors acknowledge the National Natural Science Foundation of China (21401064, 21206049 and 51472102), the Natural Science Foundation of the Education Department of Henan Province (15A150060), the National Natural Science and Henan Province United Foundation of China (U1204601), Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund (the second phase), and Leading Talents for Zhengzhou Science and Technology Bureau (Grant No. 131PLJRC649) for supports. We thank the National Supercomputer Center in Guangzhou and the High performance Computing Center of Huanghe Science and Technology College for the computer time provided. References 1.A. H. Castro Neto, F. Guinea, N. M. R. Peres, K. S. Novoselov and A. K. Geim, Rev. Mod. Phys., 2009, 81, 109-162. 2.D. Malko, C. Neiss, F. Vià ±es and A. Gà ¶rling, Phys. Rev. Lett., 2012, 108, 086804. 3.S. Zhang, J. Zhou, Q. Wang, X. Chen, Y. Kawazoe and P. Jena, Proc. Natl. Acad. Sci., 2015, 112, 2372-2377. 4.Y. Liu, G. Wang, Q. Huang, L. Guo and X. Chen, Phys. Rev. Lett., 2012, 108, 225505. 5.L. Xu, R. Wang, M. Miao, X. Wei, Y. Chen, H. Yan, W. Lau, L. Liu and Y. Ma, Nanoscale, 2014, 6, 1113-1118. 6.K. S. Novoselov, A. K.

Choosing a Major Essay -- Argumentative Education College Essays

Choosing a Major Education is a very broad and difficult term and no two people define it the same way, but most would agree that you do get an education in college. Many colleges pride themselves on developing "well-rounded" students, and yet they make it mandatory for each student to choose one field of specified study. This seems to contradict the whole "well-rounded" idea. Education can't be confined to just academics. In fact, here is how the dictionary defines academics "very learned but inexperienced in practical matters, conforming to the traditions or rules of a school." I don't want to be "considered inexperienced in practical matters." I know the dictionary definitions aren't exactly what everyone sees as the right answer, but these definitions do give us a starting point. Webster's Collegiate Dictionary defines education as the process of being educated, so here is how they define educated: "to provide schooling for, to train by formal instruction and supervised practice in a skill or profession." This is close to what I have heard when asking what education is, but one thing that has been left out is the personal experiences of an individual. Most people do believe a person must have some sort of "schooling" to be considered an educated person, and this is why so many people attend colleges and universities. It is not only what you learn in class as far as "book facts," like what year someone was born or when a certain chemical was discovered, it is also how well you learn to deal with responsibility and how you can make critical decisions. To give an example, here are a few of the individual colleges' that make up the University of Arkansas, mission statements: "The mission of the College of Ed... ... Granted, he said he uses some of the things he learned, but he could have gotten those things in almost any area he could have studied. Now it is time for you to decide if you think it is contradictive to choose a major, or if it is just a part of the educational process. I have shown you the technical definitions of some of the main words or ideas in education, does your definition match up? Hopefully this essay will help you while deciding on many things within your educational journey or even while setting up educational standards for a college or university. We must think about issues like this because such an importance is put on education, so it should not be taken lightly. I guess one reason people consider it so important goes back to the saying that education is something no one can ever take away from you. Once you get it, it is yours forever.

The Case Of A Complaining Customer – Executive Summary

The new computer system has been installed to provide easy, convenient and time saving services to customers, however it appears that Presto Cleaners may have caused unnecessary unhappy and complaining customers by imply not following a few simple steps, such as making sure their staff was trained appropriately, had tested the system and provided themselves with a backup plan. As a result of this the company now have a unhappy customer who's demanding compensation and need to take appropriate action in whichever way the operations manager feels appropriate to resolve the situation, and what is most beneficial for their company.Why Is Mr. Shelton upset? What should be done toreadors his complaint? On 28 July Mr. Shelton drops off Hess laundry to Preston cleaners. A new computer yester was introduced to him and he was requested to fill out a card, detailing special requirements or services required. A ID number was also request by presto cleaners and also for the customer to purchase a special bag to drop of Hess laundry. Using the new system, Mr. Shelton would now simply just drop of Hess laundry at the store and return to pay, hassle free apparently. Unfortunately when the customer returned to collect Hess clothes he found them to be missing.He felt the old system was quicker and easier and he wasn't happy with the new service and also very angry that Hess clothes was missing. Mr. Shelton was missing 4 shirts, 2 blouses, 1 suit and 1 skirt. Mr. Shelton complains firstly in the store personally and then contacts the store when he hears no information about Hess clothes. He struggles to communicate with anyone at presto cleaners and leaves several voice mails for the company president compensation in the form of full refund for the cleaning, full refund for 4 shirts that he purchases after the laundry goes missing and a full apology.Mr. Shelton clothes have been given to another customer and the only solution the store have is to wait and hopefully the clothes wi ll be returned. Mr. Shelton is very angry and frustrated. As the mistake has been made by presto cleaners they should take full responsibility. The response the customer should have received is being apologized to but the floor staff upon realization that the store had lost the clothes. An empathetic attitude should be shown to him at all times and he has been inconvenience and let down.The customers calls should have been responded to as ignoring him only aggravates him worse, and communicating with the customer keeping him informed of progress even if none.. The store should be checked for the missing items and customers who dad collections on the same day be contacted if possible. An apology should be made to the customer, and a refund for the cleaning service offered. A comprehensive quality improvement upland for Presto Cleaners. Based on the information presented in this case, a massive improvement on their survive quality is necessary. Presto Cleaners thrives to offer custome rs a competitive privet high quality reliable service. ‘ Goal 1: Set up a continuous improvement program, develop a TTS. Goal 2: Refer to theorists to help develop business plans. Trucker's Theory of Business – in brief Trucker characterizes the assumptions that comprise an organization's Theory of Business by stating:†These assumptions are about markets. They are about identifying customers and competitors, their values and behavior. They are about technology and its dynamics, about a company's strengths and weaknesses. These assumptions are about what a company gets paid for.Management to take refresher course in operations and customer service management Goal 5: Company needs to provide total quality management, At its core, total quality management (TTS) is a management approach to long-term success through customer satisfaction. In a TTS effort, all members of an organization participate in improving processes, products, services, and the culture in which the y work. The methods for implementing this approach come from the teachings of such quality leaders as Philip B. Crosby, W. Edwards Deeming, Armband V. Figment, Koru Chickasaws, and Joseph M. Curran.Total quality management can be summarized as a management system for a customer-focused organization that involves all employees in continual improvement. It uses strategy, data, and effective communications to integrate the quality discipline onto the culture and activities of the organization. The Primary Elements of TTS are: Customer-focused Total employee involvement Process-centered Integrated system Strategic and systematic approach Continual improvement Fact-based decision making Communications Goal 6: Customer satisfaction and loyalty lead to profit and growth, feedback system to be brought in.