Abdelilh Badwi Mohamed, William M. Ross
كلية الدراسات العليا-جامعة نبراسكا · الولايات المتحدة
Evaluation of Improvement in Sorghum Random Mating Population NP3R Using S1 Family Testing Vs Testcrossing To an Inbred Line
Abdellah Bouabbane, Amina Berrichi, Abdelmdajid Benmansour
كلية العلوم والتكنولوجيا-جامعة عين تموشنت - بلحاج شعيب · الجزائر
Dans ce travail, nous avons synthétisé le propargylamine en « one pot» à partir d’une réaction de couplage A3 d’un alcyne, d’une amine et un aldéhyde et AHA avec un catalyseur hétérogène à base de cuivre.Le propargylamine synthétisé a été caractérisé par spectroscopie infrarouge et RMN 13C, RMN 1H.Notre catalyseur est un catalyseur actif et stable pour 5 cycles dans la synthèse de propargylamine avec des bons rendements qui varie entre 70 et 95%.
AMAR Youce, SEFSAF Benoumeur
جامعة جيلالي ليابس – سيدي بلعباس · الجزائر
رامي منصور, علي هترة, لورا الوزة
كلية الهندسة الميكانيكية والكهربائية-جامعة تشرين · سوريا
رزق يوسف علي الشامي , أحمد بن مونس بن خلف العنزي
كلية التربية-جامعة الملك سعود · السعودية
Beaujuge, Pierre, Hou, Yuanfang
جامعة الملك عبدالله للعلوم والتقنية · السعودية
In this dissertation, three aspects about surface and interface engineering of conjugated polymers and nanomaterials will be discussed.(i) There is a significant promise for electroactive conjugated polymers (ECPs) in applications of electrochemical devices including energy harvesting, electrochromic displays, etc. Among these, ECPs has also been developed as electroactive materials in electrochemical supercapacitors (ESCs). Compared with metal oxides, ECPs are attractive because they have good intrinsic conductivity, low band-gaps, relatively fast doping-and-undoping process, the ease of synthesis, and tunable electronic and structural properties through structural modifications.Here, Multiple-branch-chain 3,4-ethylenedioxythiophene (EDOT) derivatives was designed as crosslinkers in the co-electropolymerization of EDOT to optimize its morphology and improve the cycling stability of PEDOT in the supercapacitor applications. High-surface-area π-conjugated polymeric networks can be synthesized via the electrochemical copolymerization of the 2D (trivalent) motifs benzo[1,2-b:3,4-b’:5,6-b’’]trithiophene (BTT) and tris-EDOT-benzo[1,2-b:3,4-b’:5,6-b’’]trithiophene (TEBTT) with EDOT. Of all the material systems studied, P(TEBTT/EDOT)-based frameworks achieved the highest areal capacitance with values as high as 443.8 mF cm-2 (at 1 mA cm-2), higher than those achieved by the respective homopolymers (PTEBTT and PEDOT) in the same experimental conditions of electrodeposition (PTEBTT: 271.1 mF cm-2 (at 1 mA cm-2); PEDOT: 12.1 mF cm-2 (at 1 mA cm-2).(ii) In electrochemical process, the suitable choice of appropriate electrolytes to enlarge the safe working potential window with electrolyte stability is well known to improve ECPs’ performance in ESCs applications. Ionic liquids (ILs) are ion-composed salts and usually fluid within a wide temperature range with low melting points. There are many unique characteristics for these intrinsic ion conductors, including high ionic conductivity, wide electrochemical voltage windows in neutral conditions, fast ion mobility in redox reaction process (>10-14 m2 V-1 s-1), low vapor pressure, and environmental stability. These properties qualified ambient-temperature ILs to be applied as supporting medium for various devices and materials processing applications in both industry and academia, overcoming the limitation of volatile organic compounds (VOCs). Especially, ILs have been utilized as superior medium to electrodeposit metals, alloys, semiconductors and ECPs in the application of supercapacitors.Electropolymerization of EDOT and its derivative 4,4'-dimethoxy-3,3'-bithiophene (BEDOT) have been studied in three kinds of imidazolium-based ionic liquids and conducting salt in VOCs with different anions both as the growth medium and the supporting electrolyte, to assess the influence of these anions on their morphology and electrochemical activity. It is found these thiophene polymers grown in ILs with higher viscosity and lower diffusion shows much slower growth rate and orderly morphologies than in Tetrabutylammonium hexafluorophosphate (TBAPF6) dissolved in acetonitrile (ACN), and gives better electrochemical performance via cyclic voltammetry (CV) and galvanostatic charge-and-discharge (CD) studies. Polymers displayed multiple redox peaks in several cases, the possible reasons and origins are discussed. The synthesized polymer can be affected greatly by both the ILs with different anion/cation, and its mutal interation with targeted monomer.. As far as known, there is no systematic study on how the anions of ILs and common organic solution could play a role as a medium both for polymerization and post-polymerization electrolyte for PEDOT and its derivatives. This study can be used as an easy reference and provide experimental diagnositc data when selecting ionic liquids to investigate and optimize thiophene-based electrochemical systems, such as batteries and supercapactiors.(iii) Another aspect about interface chemistry of direct functionalization of nanodiamond with maleimide has also been addressed. Functional nanodiamonds are promising candidates for extensive practical applications in surface science, photonics and nanomedicine. Here, a protocol of direct functionalization is described by which maleimide-derivatized substituents can be appended to the outer shell of thermally annealed nanodiamonds through Diels-Alder reaction. This protocol can be carried out in room temperature, ambient atmosphere, without catalyst, and provide functionalized nanodiamonds with good solubility in organic solution. Also, this method can be applied for other maleimide derivatives,e.g.m aleimide-fluorescene, which can be applied in fluorescence labeling, sensing, and drug delivery. A series of techniques, especially Fourier transform infrared spectroscopy (FTIR), and Solid State Nuclear Magnetic Resonance (SS-NMR) was conducted for the analysis of surface chemistry and the investigation of the two-point binding strategy in details.
ضيفي زيان بارشيد, ضيفي نعاس, قاسم رابح
كلية الحقوق والعلوم السياسية-جامعة زيان عاشور - الجلفة · الجزائر
فتيحة بن علة , قمر بلحاج, وليد زوليخة
كلية العلوم الاجتماعية-جامعة عبد الحميد بن باديس مستغانم · الجزائر
فضل عباس صالح عبد اللطيف أبو عيسى, محسن سميح الخالدي, مـحـمد السـيـد
كلية الدراسات العليا-جامعة النجاح الوطنية · فلسطين
يهدف هذا البحث إلى التعريف بالحروف المقطّعة في أوائل السور فإن تسعاً وعشرين سورة من سور القرآن تبدأ بأحرف مقطعة ولم يرد عن الرسول صلى الله عليه وسلم انه تكلم في معانيها وجميع هذه السور مكية عدا اثنتين فهما مدنيتان وهذا الأسلوب - استعمال الحروف المقطعة - كان معروفاً قبل الإسلام سواءً عند أهل الكتاب أو عند العرب قبل الإسلام ولكنه مختلف تماماً عن أسلوب القرآن. إن هذه الحروف المقطعة لها اتصال بالتناسق العددي وليس لها علاقة بحساب الجمل المعروف عند اليهود. للعلماء في هذه الحروف ما يزيد على عشرين قولاً أرجحها أنها لبيان إعجاز القرآن وأنها دالة على إثبات النبوة وصدق الرسول صلى الله عليه وسلم. ومن هذه الحروف ما يعد آية ومنها ما لا يعد آية، كما أن هناك اتصالاً بين السور المفتتحة بالحروف المقطّعة.
Belkaid Mohammed Said , Dalila Hocine
كلية هندسة الكترونية ومعلومات-جامعة مولود معمري - تيزي وزو · الجزائر
Ce travail porte sur l’élaboration, la caractérisation et l’application des films minces du TiO2 déposés par la technique APCVD.Dans une première partie, nous nous sommes intéressés à l’élaboration des films minces de TiO2 et à la caractérisation de leurs propriétés structurales, électriques et optiques en vue de l’optimisation des paramètres conduisant aux meilleures performances de tels films pour une application photovoltaïque. Dans une deuxième partie, nous nous sommes intéressés à l’évaluation de la contribution de ces couches de TiO2 déposées par APCVD dans l’amélioration du rendement . des cellules solaires au silicium multicristallin, autrement dit, le gain en rendement qu’on peut atteindre en utilisant la technologie APCVD. Selon nos résultats, cette technologie simple et peu coûteuse induit 14.26% de rendement de conversion avec un gain de +3% absolu par rapport à lacellule de référence (sans couche antireflet). Ces résultats encourageants prouvent l’efficacité de la méthode APCVD pourl’amélioration du rendement des cellules solaires au silicium .
