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Search Results: 1 - 10 of 228 matches for " Modou Tine "
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Phosphorus Based Ceramics for Positive Electrode Synthesis and Characterization  [PDF]
Diouma Kobor, Abdou Kadri Diallo, Modou Tine
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.515147
Abstract: Historically, the LiCoO2 is the most used as active material for battery positive electrode because of its great potential (3.7 - 4.2 V), its interesting specific capacity (150 mA·h·g-1) and its excellent life cycle [1]. However, its toxicity, the cobalt cost and its structural instability oriented research towards new materials more stable that can replace it. In another context, hybrid, electrical vehicles and communication (computers and mobile phones...) have increased the scientific and technological research for new materials capable of storing and return energy through a system called accumulator. And research has identified the phosphate olivine structure as the most prolific ceramic material for positive electrode. LiFePO4 is a promising cathode material for Lithium-ion batteries. It provides high thermal stability and is synthesized using low cost materials. Unfortunately LiFePO4 suffers from a low electrical conductivity, which is harmful to its electrochemical performance. Decreasing the particle size, coating the particles with carbon or doping with metal atoms can increase the conductivity of the material. In this paper, we present the synthesis, physico-chemical and electrical characterization of lithium and iron doped Al-phosphorrus-based ceramic. The NPK Fertiliser was used as Al and phosphorus precursors. The powder XRD spectrum shows a possible presence of LiFePO4 and Fe2(PO)3 in theheterostrcture. An important quantity of Al is found by EDX spectra which supposed that the most important based atom is Aluminum and not Phosphorus. This can explain the increase of the conductivity value 102 times more important than those found in the literature for LiFePO4.
Mn Effect on Nonlinear and Structural Properties of <110> Oriented PZN-4.5PT Single Crystals  [PDF]
Diouma Kobor, Modou Tine, Abdelowahed Hajjaji, Laurent Lebrun, Daniel Guyomar
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.35056
Abstract: Ferroelectric single crystals Pb(Zn1/3Nb2/3)O3-PbTiO3 (PZN-PT) are promising full materials for non resonant or large bandwidth transducers due to the large values of their piezoelectric properties (d ij , k ij ) and their low mechanical quality factor (Q ij ). Many studies on <001> oriented PZN-4.5PT single crystals were carried out but it is very difficult to find research findings on <110> oriented Mn doped PZN-PT. Thus, investigations were made using XRD, Raman and EPR characterization for <110> oriented PZN-4.5PT grown through the Flux method. Mn doping effect on structural, dielectric, mechanical and piezoelectric properties with two values of Mn percentage (1 and 2 mol%) are also reported in this paper. Through the XRD study, the lattice parameters of doped PZN-PT crystals are slightly increased compared to the undoped one but the Mn didn’t change its structure. The room temperature dielectric permittivity along <110> direction is about 1572 and 1626 (respectively 1% and 2% Mn doped crystals) which are much lower than that of the undoped PZN-4.5PT (2553). The remnant polarization and coercive field of <110> oriented doped crystal measured at 1 KHz are respectively 30 μC/cm2 and 4.30 kV/cm (PZN-4.5PT), 32 μC/cm2 and 6.10 kV/cm (PZN-4.5PT + 1% Mn) and 28 μC/cm2 and 7.30 kV/cm (for the 2% Mn doped crystal). The mechanical quality factor Qm changed from 139 to 441 respectively for the pure and 1% Mn doped single crystals at room temperature while it decreases slightly to 336 for the 2 mol% Mn doped.
Determination of the Vibro-Rotational Constants, the Dipole Moment’s Function and the Intensities of the HTO’s ν1 (ν3 by Usual Convention) Band  [PDF]
Modou Tine, Diouma Kobor, Ibrahima Sakho, Laurent Coudert
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.312243
Abstract: In the first part of this paper, an analysis of the high-resolution spectrum of the HTO molecule ν1(ν3) band, from 3630 to3950 cm1, was undertaken. The rotational transition of this band was assigned using combination differences. Their wavenumbers were analyzed with a least squares fit program in order to obtain spectroscopic constants. A perturbed state has been evidenced. In the second part, with a view towards building a spectroscopic data base, a calculation of the dipolar momentum function was undertaken.
It Takes Two to Tango: How Moscow's Influence on the United Nations was Shaped by Washington
Tine Destrooper
Opticon1826 , 2008, DOI: 10.5334/opt.040805
Abstract: To get a more profound insight into Gorbachev’s motivations for introducing the New Political Thinking, a better insight into the political situation of the U.S.S.R. is crucial. In 1985, the U.S.S.R. had been involved in the dead-end war in Afghanistan; in Eastern Europe, there was a significant politicaleconomic stagnation and the relations with the West were depressing (Sakwa, 1990). Foreign policy lacked all direction after four years of inaction, and the prestige of the U.S.S.R. was quickly eroding.
Til kulturhistoriens genealogi
Tine Damsholt
Kulturstudier , 2010,
Abstract: Hvad er kulturhistorie? Dette retoriske sp rgsm l stillede en af dansk kulturhistories faddere Troels Troels-Lund allerede p t rsklen til det 20. rhundrede og gav sit eget veloplagte og polemiske svar, hvor han hyldede dagliglivets historie frem for staternes og krigenes historie. Men er dette svar - s vel som sp rgsm let - stadig relevant i det 21. rhundrede? I det f lgende skal vi se lidt n rmere p , hvad det s rligt er kulturhistorie kan, og hvorvidt og hvordan den adskiller sig fra den almindelige historie. Abstract: The Genealogy of Cultural History What is cultural history? The paper discusses whether cultural history still should be defined by having a specific empirical object such as the history of everyday life. Taking the point of departure in the current mainstreaming of cultural history and topics outside political history within the discipline of history after the cultural turn, it is argued that cultural history should rather be a specific analytical strategy. The paper investigates the Foucauldian notion of genealogy or "history of the present" and proposes an understanding of cultural history as an analytical strategy that seeks to destabilize a present that has forgotten its contingency and the time-bound questions that gave rise to its beliefs and practices. Genealogy is therefore about tracing the heterogeneous pathways that led to the apparent solidity of the present. A first sketch to a genealogy of cultural history in Denmark is given through a discussion of the canonized text by T. Troels- Lund, On Cultural History from 1894. The idea of everyday life as the analytical and defining object of cultural history is constituted in this text as well as in the disciplinary battles that formed the situational background for Troels-Lunds argument. Instead of taking this situated definition for a given fact cultural history is - in the tradition from Foucault - understood as a critical, destabilizing and thus self-reflective analytical strategy.
Nekaj ekonomskih problemov v zvezi s stanovanji v Sloveniji
Tine Stanovnik
Urbani Izziv , 1995,
Abstract: Podan je kratek prikaz stanovanjske politike na Slovenskem ter najpomembnej i problemi, ki so danes prisotni na stanovanjskem podro ju. Zagovarjamo tezo, da je osnovna naloga stanovanjske politike razvoj neprofitnega najemni kega sektorja.
The economics of housing: Some relevant issues in Slovenia
Tine Stanovnik
Urbani Izziv , 1995,
Abstract: A brief overview of the past housing policy in Slovenia is given, together with the most pressing problems facing the housing sector. Arguments in favour of the development of an economically and financially viable non-profit rental sector are presented.
Makar Devushkin and the Ordeal of Artistic Manhood
Tine Roesen
Nordlit : Tidsskrift i litteratur og kultur , 1998,
Abstract:
Makar Devushkin and the Ordeal of Artistic Manhood
Tine Roesen
Nordlit : Tidsskrift i litteratur og kultur , 1998,
Abstract:
Workshopbericht zum Thema Rechtsradikalismus aus aktuellem Anlass.
Tine Hutzel
Journal EXIT-Deutschland : Zeitschrift für Deradikalisierung und Demokratische Kultur , 2013,
Abstract: In der Theorie und auf Sticker gedruckt scheint der Umgang mit allt glichem Rechtsradikalismus ganz leicht: Gegen Nazis“, No Nazis“, Nazis raus“, Wenn ich Nazi bin, muss ich leider drau en bleiben“, Hier werden keine Nazis bedient“. Dem an die Seite gestellt werden die Schlagw rter der Demokratie: Zivilcourage, Multikulti, Opferschutz, Solidarit t, Vielfalt. Aber wie erkennt man rechtes Gedankengut, wenn es nicht in plakativsten (und l ngst veralteter) u erlichkeiten wie Springerstiefeln, Hakenkreuz und Glatze auftritt? Und wie geht man damit um? Diskutieren? Tolerieren? Ignorieren?
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