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Electronic Specific Heat of Iron Pnictides Based on Electron-Cooper Pair Interaction  [PDF]
Abel Mukubwa
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1105107
Abstract:
The discovery of iron pnictides in 2006 added on the number of materials that have the potential to transmit electricity with close zero d.c resistance. High-temperature iron-based superconductors have been obtained through modification, mostly by doping, of the initially low-temperature iron-based superconductors. Unlike in LTSC, the energy gap in HTSC requires a theory, beyond spin fluctuations, to explain its anisotropy. This study seeks to establish a common ground between iron pnictides and cuprates towards explaining high temperature superconductivity. There is a general consensus on the existence of Cooper pairs in these systems. In addition to this, experimental results have revealed the existence of electron-boson coupling in iron pnictides. These results make it viable to study the interaction between an electron and a Cooper pair in iron based superconductors (IBSC). In this study, Bogoliubov-Valatini transformation has been used in determining the electronic specific heat based on the interaction between an electron and a Cooper pair in high-temperature IBSC, namely, Ca0.33Na0.6Fe2As2 and SmFeAsO0.8F0.2. We record the theoretical electronic specific heat of CeFeAsO0.84F0.16 and SmFeAsO0.8F0.2 as 164.3 mJ mol-1 K-2 and 101.6 mJ mol-1 K-2 respectively.
Thermodynamic Properties of Yttrium Based Cuprate Due to Electron-Cooper Pair Interaction Using BVT  [PDF]
Abel Wamalwa Mukubwa, Jared Oloo Odhiambo, John Wanjala Makokha
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1104880
Abstract:
Since the discovery of high temperature superconductivity (HTSC), there have been varied results concerning the high pairing energy in the unconventional superconductivity. In an attempt to unearth the mechanism behind the high pairing energy, we study a model in which an excited electron interacts with a Cooper pair. The interaction was studied earlier on using second quantization which depended on a wave function. We now use Bogoliubov-Valatini trans-formation (BVT) that is independent of the wave function to study the thermodynamic properties due to the interaction between an electron and a Cooper pair in a Yttrium based cuprate. The interaction energy increases with temperature and at ; we record the interaction energy of 2.173 meV and the specific heat of 4.669 J·mol·1·K·1. The entropy of this system is found to be 5.11 mJ·g·1·K·1. The Sommerfeld’s coefficient is maximum at where . It has also been observed, for the first time, that the thermodynamic quantities of YBCO123 are constant when temperature varies between 0 K and 18 K. Above 18 K, the thermodynamic quantities rise sharply. This observation has been attributed to the pairing of electrons in the singlet-s and singlet-p states.
The center of topologically primitive exponentially galbed algebras
Mart Abel,Mati Abel
International Journal of Mathematics and Mathematical Sciences , 2006, DOI: 10.1155/ijmms/2006/19697
Abstract: Let A be a unital sequentially complete topologically primitive exponentially galbed Hausdorff algebra over ℂ, in which all elements are bounded. It is shown that the center of A is topologically isomorphic to ℂ.
Box dimension, oscillation and smoothness in function spaces
Abel Carvalho
Journal of Function Spaces and Applications , 2005, DOI: 10.1155/2005/405979
Abstract: The aim of this paper is twofold. First we relate upper and lower box dimensions with oscillation spaces, and we develop embeddings or inclusions between oscillation spaces and Besov spaces. Secondly, given a point in the (1p, s)-plane we determine maximal and minimal values for the upper box dimension (also the maximal value for lower box dimension) for the graphs of continuous real functions with a compact support, represented by this point.
Seminario sobre Evaluación de la Producción Científica: Informe final
Packer,Abel;
ACIMED , 2001,
Abstract: it describes the aims and program of the scientific literature evaluation seminar, organized by the scielo project, on march 4-6, 1998. it includes a summary of the presented lectures, as well as the results and conclusions of the event.
DIFICULDADES E SOLU??ES(OU PSEUDO-SOLU??ES)DA INTEGRA??O: "COOPERA??O REFOR?ADA" EUROPEIA, MECANISMO DE INTEGRA??O OU NOVA FORMA DE MERA COOPERA??O INTERNACIONAL?
Laureano,Abel;
International Law , 2011,
Abstract: the european integration has faced severe difficulties, which have not allowed, so far, the achievement of a higher level of interpenetration of the intervenient states. it occurs, in that phenomenon, a "structural" ambivalence, conducting to a limited de facto integration; and this, due to the essential lack of an "emotional integration" (inexistence of an "emotional community identity"), which leads, in the end, to the weakness of a political society without people. "enhanced cooperation" is a mechanism that intends to give a new impulse to european life. but (and apart from the question of knowing which will be its real impact), are we dealing with a juridical-political expedient still comprised in the feld of integration or is it already located outside that frame? enhanced cooperation represents in fact an attempt to counterbalance the problem of the existence of diverse (sometimes, even quite diverse) interests and attitudes of the member states of the european union, formally consecrating the possibility of "spaces" of diversity in the midst of the european community phenomenon. but doesn't integration consist essentially in uniformity? or is it that the lack of uniformity this way allowed, still fits in the concept of "integration", thus not meaning a resignation to this very model of relationship among states?
Apuntes sobre una representación social de la adolescencia en los editoriales del diario La Nación
Zanotto,Abel;
Subjetividad y procesos cognitivos , 2012,
Abstract: the concept of social representation, despite issues yet to solve, expresses a perspective that overcomes classic dichotomies in social psychology: individual/society, nature/ culture and knowledge acquisition as personal production or social imposition. the present contribution addresses the social construction of the representation of urban teens of the beginning of the century in complex intertwinement of youth-impulsivityalcoholism, in editorials of a newspaper in buenos aires. these secondary sources are appropriate to track these and other representations, as mass media dissemination and outreach are undisputed as well as their ability to set a public agenda that gathers concerns of a particular community and that emphasizes them through constant feedback.
Comités de ética asistencial
Abel,F.;
Anales del Sistema Sanitario de Navarra , 2006, DOI: 10.4321/S1137-66272006000600008
Abstract: the author, who in 1976 started the first healthcare ethics committees in spain, analyses the advantages of being able to count, from the outset, on a moral community of strongly motivated health professionals at a public, university, maternal-infant hospital of reference, privately managed by the order of san juan de dios. from his perspective, he considers that the evolution of these committees shows patterns of similar conflicts in overcoming the ethical-philosophical conflicts of scientific and ethical-religious reductionisms. he considers that only interdisciplinary and transdisciplinary dialogue makes it possible, in our plural society, to find -through deliberation- the best route for solving ethical conflicts respecting the dignity of the patients and the health professionals. he opted for an autonomous ethics in a context of faith. he considers it to be an error to replace interdisciplinary dialogue within the hospital with consulting groups or persons specialising in professional ethics, the self-denominated "bioethical consultants", whether they be doctors or lawyers. he is very critical of the widespread error of confusing criteria of positive evaluation of the "joint commission" with criteria of careful deliberation, and he schematises models for analysing problems and placing them in context.
Property Market Nature and the Choice of Property Portfolio Diversification Strategies: The Nigeria Experience
Abel Olaleye
International Journal of Strategic Property Management , 2008, DOI: 10.3846/1648-715X.2008.12.35-51
Abstract: With a focus on the Nigerian property market, this paper considered and empirically analyzed how property market nature and the perception of market players of some qualitative factors have impacted on choice of property portfolio diversification strategies. Questionnaires, backed up with interviews, were administered on 28 institutional property investors and 159 real estate practitioners in three commercial nerve centres of Nigeria, namely, Lagos, Abuja and Port-Harcourt metropolitan areas. The frequency distribution analyses' results revealed that the Nigerian property market was an emerging one and, as it is expected, there was dearth of time series data while investors in the market were small time institutional investors. Using mean rating on a 4-point rating scale, the study found six factors, arising from the nature of the property market, as the significant factors impacting on choice of diversification strategies. These are: the investors' overall expectation of the benefits of diversification scheme, the need to reduce management operating costs, management convenience, operating environment, market players' education and knowledge of alternative diversification techniques and availability or otherwise of data in the market. The result of cross tabulation and Chi-square test also indicated that there was a statistically significant relationship between educational qualifications of practitioners and their choice of diversification strategies.
Die Buffel Struikel: n Storie van 32 Bataljon en sy mense
Abel Esterhuyse
Scientia Militaria: South African Journal of Military Studies , 2007,
Abstract: L.J. Bothma Bloemfontein: Handisa, 2006 383 pages Maps (6) and Photos ISBN – 10: 0620372966; 13: 9780620372961 Price unknown Scientia Militaria, South African Journal of Military Studies, Vol 35, Nr 1, 2007
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