Rhenium Oxide (ReO3) and Highly Applied Pressure

Rhenium Oxide (ReO3) and Highly Applied Pressure Describe the symmetry characteristics of the ReO3 polymorphs and their relationship to applied pressure. Rhenium Oxide also known as ReO3 has been researched and looked into detail widely with the use of highly applied pressure. ReO3 is described as a non distorted structure at surrounding pressure levels. Accurate and precise measurements of the pressure-volume relationship crafted by Batloff showed that the transistion pressure was at a value of 5.0kbar and also presented that volume strain is related to (P-PC)2/3. Differences in volume strain was evidently great when comparing with other materials that went through the same process.The reason for this large difference was due to the buckling of the Re-O-Re bonds while ReO6 continued to be firm and strong. With the assumption that octahedral rotation is always as rigid units,stress on rotations that are small will be directly related to the square of the rotation angle, Ø that leads to Ø2. This in turn would allow the polymorph to transform into various phases. The curvature behaviour which was found by Razavi starts at low temp eratures with pressure level of 3kbar.M3 phonons being triply degenerate allows the surrounding temperature of ReO3 with a ambient pressure to have a Pm-3m symmetry. At this current stage it will undergo a transition to a structure that contains a Im-3 symmetry. When changed to a tetragonal form, it will be P4/mbm at 5.2kbar and cubic Im3 at 7.3kbar at increased levels of pressure. The Im3 structures were formed with the process known as condensation from one, two or three M3 phonons. With this transformation, the cubic structure will go through a rhombohedral phase with the symmetry structure of R-3c. The current R-3c will morph again to a rhombohedral phase. ReO6 being a octahedral undergoes a distortion at high pressure, giving a rotation angle of (P-PC) ÃŽ ² where ÃŽ ²=0.322(5) (ÃŽ ² describes the large critical region where the rotation angle is more than 14Â º) that is valid from pressure levels of 5.0 to 27.4kbar. Pressure measurements are mainly done to identify different h igh pressure formations of the ReO3 and the quantity of these formations. Particularly with the use of the time of flight Laue method, when the pressure formation reaches a value of 15 kbar, the structure deduced as a cubic Im3. Despite, the discovery there was a downturn which was the values tabulated was only at a single pressure point. Therefore the entire formation of the breakdown of the structured could not be figured out. Describe the metrical relationships between the polymorph unit cells and ReO6 octahedral tilting. Use the CIF files to create ATOMS drawings that support your analysis. The malformation of perovskite structures can be acquired with reference from the Pm3m structure by rotating the octahedral about the cubic axes. High tension and stress arrangements can be identified and elaborated with the aid of 23 various rotating arrangements that was discovered by Glazer. Respective symmetry groups for high stress transitions include the P4/mbm and Im3 where both groups are homogenous with the M3 phonon condensation. The element Re is fixed in the 8c position in the Im3 space group with only 2 thermal values whereas the oxygen atoms is found to be at the 24g position with 4 thermal values. With a increased in the loading added to the P4/mbm structure will create a deceasing strain that may deform the structure. P4/mbm being a 7 lattice point structure has a normal way of placing the positions of the elements found in ReO3. The Rhenium element is located in the 2b position while the oxygen atom would be fixated in the 4h and 2a position. In the presence of surro unding atmospheric pressure, the direct dependency of the oxygen atoms is fairly lower in the Im3 group than the one found in the Pm3m.In the Im3 unit cell for the ReO3, rotation was done around the coordinates of (111) for the eight sided compound. Evidently P4/mbm produces a nonzero seven sided pull that creates a positive and negative strain value. This rotation created the process of condensation that affected all three M3 phonons. Deformation in the eight sided ReO6 produces two different Re-O bond distances in the P4/mbm formation while there would only be a single Re-O bond found in the Im3 strucutres.Re-O bonds parallel with the c axis will remain in a pressed state when turned whereas Re-O bond that are normal to the c axis will not be in a pressed position but instead arranged in an order where there are gaps.However both formations include double O-O corners of the octahedron that is used to quantify any errors in ReO6.However the O-O distances found in the Im3 and P4/mbm are varied at a pressure value of 27.40kbar that leads to certain abnormalities but can be ignored as trivial. Explain the distortion of the ReO6 octahedra with pressure and quantify the ReO6 octahedral titlting. The deformation and the distortion of the ReO6 octahedron is usually found in the P4/mbm and Im3 structures. Starting with the P4/mbm, there are two symmetry Re-O bonds which are not equal in nature. With the process known as the powder neutron diffraction , the results obtained shows the in depth structural details of the transformation with the function of pressure and thus this confirms that at least 2 high pressure phases are present. When the ReO6 octahedra are rotated they are observed more with ease through the neutrons than the x rays. The method known as Rietveld method of the structural refinement with the high resolution powder data produces the single-crystal neutron diffraction study and this would allow the pressure dependence of the distortion to be measured with sufficient accuracy to state that the order parameter exponent ÃŽ ² where Ø is proportional to the (P-Pc) ÃŽ ² presents the pressure dependence of the rotation angle. This pressure based on the rotation ang le is illustrated well by the law of power in the formula Ø~(P-Pc) ÃŽ ².Ø against the pressure and the curve is plotted with this reference. The result from the exponent ÃŽ ² was obtained with the linear gradient of the slope of the lnØ against the ln(P-Pc) curve that produces the value of ÃŽ ²=0.322(5). Through the discrepancies Ø is always continuing with the stress value of 5 kbar despite the direction of the rotation axis that would vary from (100) to (111) during the change from P4/mbm to the Im3 phase (5.3kbar). With condensation of one, two or three M3 phonons would increase the phase transition from Pm3m to P4/mbm to I4/mm and lastly to the Im3 that have usually been seen in Nax WO3 during the M3 phonon condensation upon cooling. The parameter for the phase transition would be a three component order with the Ø as the magnitude of the rotation angle surrounding the direction of the rotation aixs. The transformation from Pm3m to any of the groups between the P4 /mbm, I4/mmm and Im3 would be the first order that would produce from the rotation around a axis. Abnormalities in the lattice during the transformation would have been seen in the Nax WO3.

If Beale Street Could Talk: The Story of Love and Endurance Essay

The topics of racial injustice and ethnic discrimination are extremely popular in literature. Writers of fiction exploit these topics, to shed the light on the difficulties a black person faces in contemporary America. James Baldwin’s If Beale Street Could Talk is considered by critics as a brilliant representation of the racial and ethnic tensions in the American society. However, despite the profound racial implications, this book is primarily a love story. Certainly, James Baldwin condemns racism and imperialism and criticizes racial bias in criminal justice and social relationships. However, more than anything else, James Baldwin’s If Beale Street Could Talk is a complex example of a love story, in which two people deeply connected to each other face the pain of separation and successfully pass this test to their feelings and commitments. James Baldwin’s If Beale Street Could Talk is a successful example of a love story, in which two people deeply connected to each other face the pain of separation. Fonny and Tish are separated by the injustice and racial bias that are so characteristic of the American criminal justice system. However, not the injustice and racial bias but the pain and sufferings of a loving man and a loving woman shape the foreground of Baldwin’s story: â€Å"I always remember now, because he’s in jail and I love his eyes and every time I see him I’m afraid I’ll never see him again. So I pick up the phone as soon as I get there and I just hold it and I keep looking up at him. [†¦] I hope that nobody has ever had to look at anybody they love through glass† (Baldwin 4). The fact of Fonny’s being falsely accused of rape is just a minor part of Tish’s personal experiences. Tish fights to release Fonny from prison not because she wants to prove the unfairness of the racial relationships in her society, but because she truly loves her man and wants to spend her life with him. The baby in Tish’s belly adds stimuli to her individual fight for happiness and turns Baldwin’s book into a story of love that can survive the most unbelievable hardships. Baldwin’s book is the story about love that evolves over Tish and Fonny’s lifespan. Tish’s memories bring the reader back to her infant and school years: her first encounter with Fonny, her experiences and perceptions about his personality, the development of their feelings toward each other, and the first understanding that they were meant to be together. â€Å"I thought of Fonny’s touch, of Fonny, in my arms, his breath, his touch, his odor, his weight, that terrible and beautiful presence riding into me and his breath being snarled, as if by a golden thread, deeper in his throat as he rode†¦Ã¢â‚¬  (Baldwin 35). The way Baldwin describes Tish and Fonny creates a sense of a never ending happiness, which happens only once in a lifetime. Through the prism of her memories and experiences, Tish cannot but recognize the wonder of her own and Fonny’s feelings. She cannot but admit that â€Å"it’s a miracle to realize that somebody loves you† (Baldwin 36). Even if any racial and ethical dilemmas poison their lives, they are overshadowed and die away against the connectedness of their souls and spiritual beings. In the context of Baldwin’s story, racial discrimination and bias are useful only to the extent that emphasizes the miraculous nature of the relationship between Tish and Fonny. This relationship is equally complicated and perfect. Nothing can break their love. The future baby is, probably, the culmination of their feelings toward each other: â€Å"Love had sent it, spinning out of us, to us. [†¦] Something in me sang and hummed and then I felt the deadly morning sickness†¦Ã¢â‚¬  (Baldwin 41). These are the realities in the lives of any two people, who love each other and who, regardless of the social and racial difficulties, turn this love into the strongest stimulus in their movement to the ultimate happiness. Baldwin’s If Beale Street Could Talk is a complex example of a love story, in which two people who are deeply connected to each other successfully pass a difficult test to their feelings and commitments. Fonny’s arrest and imprisonment is the first serious separation in the life of Tish. Tish feels the threat of losing Fonny. She is not afraid of loneliness, but she is afraid of losing her beloved man forever. She remembers the best moments of their relationship, and these memories give her strength to move forward and bring Fonny back home: â€Å"You know, that I’ve always been yours, right? – I said, ‘I never thought about it that way’. He said, ‘Think about it now, Tish. ’ ‘I just know that I love you’, I said, and I started to cry† (Baldwin 63). Love gives Tish trust and endurance; she is full of confidence that she will be able to win this fight against the injustice. In her talk to Victoria, Tish once again says that she knows Fonny is not guilty. Her argument is simple: she has known him all his life (Baldwin 141). Not the striving to change the society’s beliefs about race, but Tish’s true love and commitment to Fonny move her to the victory. In a similar vein, love is the only source of hope for Fonny: â€Å"Baby. Baby. Baby. I love you. And I’m going to build us a table and a whole lot of folks going to be eating off it for a long, long time to come† (Baldwin 163). With their love, as well as the hope and faith born out of their love, Tish and Fonny successfully pass the test of separation. Nothing but love supports them on their way to each other. James Baldwin’s book is a triumph of the sincere human feelings, which can successfully break the racial, social and injustice barriers in the way to never ending happiness. Conclusion James Baldwin’s If Beale Street Could Talk is often considered as the bright description of American imperialism, racism, and ethnic injustice. However, the book is primarily a complex example of a love story, in which two people deeply connected to each other face the pain of separation and successfully pass this test to their feelings and commitments. The evolution of the romantic relationship between Tish and Fonny is at the story’s foreground. The fight against racial bias and the inconsistencies of the criminal justice system are of minor importance: nothing but love moves Tish on her way to releasing Fonny from imprisonment; nothing but love gives Fonny more hope and optimism. Love gives Tish and Fonny strength and endurance necessary to successfully pass the test of separation. In this sense, James Baldwin’s book is the triumph of the sincere human feelings, which can successfully break the racial and social barriers in the way to never ending happiness.

4P Marketing Essay

hese are the basic elements of the MARKETING PLAN for any business. PRODUCTThe business has to produce a product that people want to buy. They have to decide which market segment they are aiming at age, income, geographical location etc. They then have to differentiate their product so that it is slightly different from what is on offer at present so that people can be persuaded to give them a try. PROMOTIONCustomers have to be made aware of the product. The two main considerations are target market and cost. A new business will not be able to afford to advertise on national television, for instance and would not wish to because its market will be local to start with. Leaflets, billboards, advertisements in local newspapers, Yellow Pages and word of mouth would be more appropriate. PRICEThe price must be high enough to cover costs and make a profit but low enough to attract customers. There are a number of possible pricing strategies. The most commonly used are PENETRATION PRICING ch arging a low price, possibly not quite covering costs, to gain a position in the market. This is quite popular with new businesses trying to get a toehold. CREAMING the opposite to penetration pricing, this involves charging a deliberately high price to persuade people that the product is of high quality. Luxury car makers often use this strategy COST PLUS PRICING this is the most common form of pricing. Costs are totalled and a margin is added on for profit to make the total price. PLACEThe business must have a location that it can afford, and that is convenient and suitable for customers and any supplier. The Marketing mix is a set of four decisions which need to be taken before launching any new product. These variables are also known as the 4 Ps of marketing. These four variables help the firm in making strategic decisions necessary for the smooth running of any product / organization.These variables are Product

A Research Study On Stem Cell Research Essay - 1265 Words

Lyka De La Fuente Period 11 Senior Composition Stem Cell Research According to the Merriam-Webster dictionary a stem cell is â€Å"a simple cell in the body that is able to develop into any one of various kinds of cells (such as blood cells, skin cells, etc.).† There are two types of stem cells, embryonic and adult. The adult stem cells can can be found in brain, bone marrow, blood, etc. The embryonic stem cells come from a four to five day human embryo during the blastocyst phase (Crosta) . The controversy behind the topic usually stems from the embryonic stem cell research. People argue over whether an embryo at this stage is considered a human or a scientific sample. US news held a poll and these were the results; â€Å"Almost three-quarters (72 percent) of the adults surveyed believe that scientists should be allowed to use embryonic stem cells left over from in vitro fertilization procedures to search for potential treatments or ways to prevent diseases such as Parkinson s disease, Alzheimer s, diabetes and other conditions.† (Ga rdner). Although there is controversy behind stem cells, the majority of Americans support scientists in stem cell research. Stem cell research is beneficial because they can help treat Parkinson’s disease, replace or repair damaged organs, and they specialize undifferentiated cells. The term stem cell was first used in 1868, it was used to describe a fertilized egg that transformed into an organism (Boston Children’s Hospital). Although the termShow MoreRelatedA Research Study On Stem Cell Research1644 Words   |  7 PagesStem cell research has covered many parts of research today and is growing progressively and becoming more common in research today. These cells have the potential to grow and develop into any other cell type in the body and form or make up the tissues of the body and organs. There are millions of people today who suffer from birth defects or diseases because of damaged cells or tissue. Stem cells give researchers the ability cure and replace almost all the cells in the body and help grow new tissueRead MoreA Research Study On Stem Cell Research1324 Words   |  6 Pageslike this. He knows that stem cells could help cure him from his misery, so he has been fighting and fighting for stem cell research to be fully funded in America. Ste m cells are cells that have the skill to change into any type of cell in the human body (Lewis). These cells could be put anywhere ill in the body to make it healthy again. Imagine all of the people with chronicle diseases and cancer being able to have hope for being happy and healthy again. Also, these stem cells can fix damaged organsRead MoreA Research Study On Stem Cell Research2115 Words   |  9 PagesStem cell research, through its ethics, methods, and funding, has caused great controversy over the past several decades. Scientists, medical specialists, religious groups, spiritual groups, the government and the public have devoted a major interest in this subject. Some portray stem cell research as a dangerous, inhumane study whereas others see it as a growing beneficial factor for opportunity of the advancement of the medical world. Stem cell research has been proven to aid various diseasesRead MoreA Research Study On Stem Cell Research2605 Words   |  11 Pagestruly b elieve that stem cell research is going to allow our children to look at Alzheimer’s and diabetes and other major diseases the way we look at polio today, which is a preventable disease† (Solomon). Susan Solomon was the researcher that founded the New York Stem Cell Foundation and has been seen as the hero for stem cell scientists around the world. Over the past couple years, stem cell research has been at its highest; scientists all over the world are using these cells to try to find newRead MoreA Research Study On Stem Cell Research1665 Words   |  7 Pages Stem cells have advanced the way researchers look at curing what were once considered untreatable diseases. Modern technology has played a key role in the discovering of these stem cells and how they are used in the body. Many argue that the use of adult and embryonic cells is unethical and inhumane to society, however, there is one point taken into consideration when making that statement; if researchers could develop a cure for a disease that was affecting a family member of those who oppose itRead MoreA Research Study On Stem Cell Research1307 Words   |  6 PagesStem cell research is a controversial, yet fascinating field of study. The examination of stem cells has captivated political, scientific, and public interest for many decades. Therefore, numerous scientific research studies have been done to determine the exact purpose of stem cells, as well as their beneficial properties. Stem cells have been noted as powerful deterrents when studying and fighting against disease. It is understood that almost every cell in a person’s body has one main functionRead MoreA Research Study On Stem Cell Research Essay907 Words   |  4 PagesStem Cell Research A stem cell is defined as having â€Å"the ability to make specialized cells for various tissues in the body, such as heart muscle, brain tissue, and liver tissue† (umm.edu) Two of the most commonly studied stem cells are adult and embryonic. Adult stem cells are cells that have already became specialized, such as heart or muscle tissue. Embryonic cells on the other hand are still in development. This means that with some modifying, then an embryonic stem cell can develop into almostRead MoreA Research Study On Embryonic Stem Cell Research1618 Words   |  7 Pagesfield of science, embryonic stem cell research. This field involves research that could develop cures or methods of preventing, treating, or medicating people afflicted with these debilitating, often deadly disorders. 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Among various types of cells of human bodies, a stem cell can turn into any type of specialized cell of human body. A stem cell is a cell that has the ability to develop into any conceivable different kind of specialized cell type. The existence of a stem cell was first discovered by Drs. James Till and Ernset McCulloch from Canada. A stem cell can be distinguished into two types: adult stem cell and embryonic stem cell. An embryonic