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Numerical Study of Temperature and electric Field Effects on the Total Optical Absorption Coefficient in the Presence of Optical Inter-Conduction-Subband Transitions in InGaN/GaN Single Parabolic Quantum Wells

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Fluid Dynamics & Materials Processing 2022年第5期18卷 1253-1261页

作者： Redouane En-nadir haddou el-ghazi Anouar Jorio Izeddine Zorkani Hassan Abboudi Fath Allah Jabouti LPS Sidi Mohamed Ben Abdullah UniversityFez30000Morocco ENSAM Hassan-II UniversityCasablanca20470Morocco

In this paper,we theoretically investigate the total optical coefficient(TOAC)considering 1S-2P and 2S-2P conduction subband transitions in a single parabolic quantum well(SPQW)with an on-center hydrogen-like *** the framework of the effective-mass approximation,the Schrödinger equation is solved numerically to obtain the eigenvalues and their corresponding eigenvectors using the finite difference *** calculations are performed for finite confinement potential height,taking into account the dielectric and effective mass mismatches between GaN and InGaN materials under the considered electric field and temperature *** temperature dependence of the effective mass,dielectric constant and band gap energy are obtained *** the one hand,the results show that a significant shift is produced with the variation of both the temperature and the intensity of the electric *** the other hand,the absorption spectrum is shifted to lower energies with increasing both electric field strength and ***,its amplitude is enhanced with an increase in the intensity of the electric field,and show a slight drop with increasing temperature for the two optical transitions *** results show that such parameters can be used to adjust the optical properties of single parabolic Quantum Well for solar cell applications.

关键词： TOAC optical transitions SPQW electric field intensity temperature hydrogenic-impurity

Competitive Contribution of Catalyst and Adsorption Roles of TiO_2 on the Degradation of AO7 Dye During Plasma Treatment

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Plasma Science and Technology 2013年第9期15卷 915-922页

作者： Nabila haddou Moufok Redounae GHEZZAR Fatiha ABDelMALEK Stephanie OGNIER Ahmed ADDOU Laboratory of Science and Technical Environment and Valorization University of Mostaganem Laboratory of Process Engineering and Surface Treatment National School of ChemistryUniversity of Pierre and Marie Curie

In order to investigate the role of TiO2 during plasma treatment, the degradation of the dye AO7 has been studied by gliding arc discharge in the presence of a TiO2 catalyst （CGAD）. The results revealed that the adsorption of the dye on TiO2 is a physical adsorption in accordance with Langmuir isotherm, with a constant of adsorption KL ： 0.52 mg/L and a maximum adsorption capacity b = 18.1 mg/g. The temperature variation of the reaction medium made it possible to consider thermodynamic parameters. Indeed, the adsorption is exothermic （enthalpy： △H 〈 0）, and spontaneous （free enthalpy： △G 〈 0）. The negative entropy （△S 〈 0） confirms the affinity of the dye molecules for TiO2. 20 min of CGAD treatment in the pres- ence of an optimal quantity of TiO2 （2 g/L enabled us to bleach the solution of AO7 （100 μM） completely. The discoloration rate with and without the addition of TiO2 was 100% and 28%, respectively. 40 additional minutes of treatment allowed a total abatement of the chemical oxy- gen demand. The elimination of AO7 molecules during the plasma-catalytic treatment follows Langmuir-Hinshelwood （L-H） model kinetics. According to this model, the speed constant is kr = 14.97 mg-L-1 ·min-1 and the adsorption coefficient is KL-H= 0.010 L/mg. The latter being negligible compared to kr, adsorption is therefore weakly performed during the plasma treatment.

关键词： adsorption catalysis AO7 gliding arc discharge TiO_2 degradation

Coulometric sizing of nanoparticles： Cathodic and anodic impact experiments open two independent routes to electrochemical sizing of Fez04 nanoparticles

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Nano Research 2013年第11期6卷 836-841页

作者： Kristina Tschulik Baptiste haddou Dario Omanovi Neil V. Rees Richard G. Compton Department of Chemistry Physical & Theoretical Chemistry Laboratory Oxford University South Parks Road Oxford OXI 3QZUnited Kingdom Center for Marine and Environmental Research Ruder Boskovic Institute P. O. Box 180 I0001 Zagreb Croatia

Anodic particle coulometry （APC） is a recently established method of sizing individual metal nanoparticles by oxidising them during their impact on a micro electrode. Here it is demonstrated that the application of APC can be extended to sizing of metal oxide nanoparticles, such as Fe304 magnetite nanoparticles. Additionally, a new route to electrochemical nanoparticle sizing is introduced-- cathodic particle coulometry （CPC）. This method uses the reduction of impacting nanoparticles, e.g., metal oxide nanoparticles, and is demonstrated to yield correct size information for Fe304 nanoparticles. The combination of these two independent electrochemical methods of nanoparticle sizing, allows for purely electrochemical sizing of single nanoparticles and simultaneous verification of the obtained results.

关键词： nanoparticle sizing Fe3O4 anodic particle coulometry cathodic particle coulometry impact experiments metal oxide nanoparticles

Association Study of Two Polymorphisms in Vitamin D Pathway with Multiple Sclerosis in the Moroccan Population

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World Journal of Neuroscience 2017年第4期7卷 363-375页

作者： Asmae Skalli el Hachmia Ait Ben haddou Rachid Tazi-Ahnini Ghislain Armel Mpandzou Houyam Tibar Naima Bouslam Ali Benomar Khadija Hajjout Mohamed Yahyaoui elmostafa el Fahime Ahmed Bouhouche Research Team in Neurology and Neurogenetics Medical School and Pharmacy Mohammed V University Rabat Morocco Department of Neurology and Neurogenetics Specialties Hospital Rabat Morocco Laboratory of Biotechnology Medical School and Pharmacy Mohammed V University Rabat Morocco National Blood Transfusion Center Rabat Morocco Assistance Units for Scientific and Technical Research Rabat Morocco

Background: Hypovitaminosis D is reported through the literature to be involved in autoimmune diseases such as multiple sclerosis (MS). In the last decade, numerous studies have investigated the association of single nucleotide polymorphisms (SNPs) with MS, including rs2248359 (CYP24A1) and rs703842 (CYP27B1) that are involved in vitamin D metabolic pathway. However, results were conflicting, probably due to ethnic differences between the studied populations. In this context, the present study aimed to analyze the association between these two SNPs and MS within the Moroccan population. Methods: rs2248359 and rs703842 were genotyped in 113 patients and 146 healthy controls. To assess their association with the disease risk, we compared the genotypic and allelic frequencies between the study groups. We also explored their possible influence on certain clinical features (age at onset, type, disability status and severity score) and with vitamin D3 serum level (DSL) by comparing mean values of these variables between the different genotypes. Results: No statistically significant differences in the distribution of both SNPs were found between patients and controls. A trend has emerged concerning the minor G allele of rs703842 which appears to have a protective effect on developing MS, but this result remained slightly below significance. Also, the two polymorphisms had no impact on the clinical features tested and the DSL. Conclusion: There is no convincing evidence that rs2248359 and rs703842 are associated with MS risk, its clinical features or vitamin D level in Moroccans. Further larger investigations are needed to confirm these findings.

关键词： Multiple Sclerosis Risk rs2248359 rs703842 Clinical Features Serum 25(OH)D3 Level

Surgical Treatment for Proximal Humerus Fractures Comparison between Plate Fixation and Kapandji’s Pinning

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Open Journal of Orthopedics 2022年第12期12卷 474-484页

作者： Issam Ait Hadj Sliman Amine Abdelaoui elhoussain Zim Mohamed haddou Amine Benhima Imad Abkari Youssef Najeb Department of Orthopedic Surgery and Trauma Hopital Ibn-Tofail CHU Mohammed VI Marrakesh Morocco

Introduction: Proximal humerus fractures are common, however, there is no consensus on a decision-making algorithm for the therapeutic management of these fractures, the aim of this study is to evaluate and compare functional results between two surgical techniques and to deduce the satisfactory results of the Kapandji’s pinning which, compared to the screw plate, should keep its place in the therapeutic arsenal. Patients and Methods: It’s a retrospective study, including two groups: The first of 18 patients treated with palm-tree pinning using kapandji’s technique, the second of 16 patients treated with anatomical screw plate at the orthopedic trauma service of the Mohamed VI university hospital between July 2013 and July 2018. We compared the results of the two techniques by studying three parameters which are the healing time, the anatomical reduction, and the functional outcomes. The average age was 46 years, and the sex ratio (M/F) was 2.3. Results: The statistical analysis of functional and radiological results showed no significant difference between the two techniques, indeed the average healing time was 56.3 days in the group treated by screw plate and 55.2 days in the group treated by Kapandji’s pinning (p = 0.46), Constant’s score was 73.18 and 79.05 respectively (p = 0.27) and the average cephalodiaphyseal angle was 49.03° and 52.07°, respectively (p = 0.35). Discussion: This study has clearly shown, as reported in the literature, that there is no conclusive evidence to suggest superiority of os-teosynthesis by anatomical plate versus kapandji’s pinning. However, the simple achievement of pinning according to kapandji’s technique, the preservation of soft tissues and the low cost make us prefer this technique. Furthermore, despite the progress noted in the development of osteosynthesis means of the proximal humerus, percutaneous pinning should always keep its place.

关键词： Fracture of Proximal Humerus Osteosynthesis Humeral Anatomical Plate Kapindji’s Pinning

应用蒙特卡罗方法计算能量低于3MeV的光子剂量

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中国医学物理学杂志 1998年第2期15卷 97-101页

作者： Ali BENDAOUD A.FAHLI A.AIT haddouUnity of work:A.AIT haddou (National Center of Energy Science and Nuclear Technology) in Rabat MoroccoA.FAHLI: Hassan Ⅱ University of Science,Faculty Ben M′Sik Casablanca Morocco Ali BENDAOUD:Hassan Ⅱ Unive 阿里.班达乌德清华大学留学生

目的：用电脑计算在每个物体中每点处点源释放出的原始光子和平均能量损失，以获得光子线在水模体中的剂量分布情况。材料：钴６０机器，长方体的水模体（ＰＨＡＮＴＯＭ），圆柱状钴６０源，直径为２．５厘米，高为２．６厘米。野的范... 详细信息

目的：用电脑计算在每个物体中每点处点源释放出的原始光子和平均能量损失，以获得光子线在水模体中的剂量分布情况。材料：钴６０机器，长方体的水模体（ＰＨＡＮＴＯＭ），圆柱状钴６０源，直径为２．５厘米，高为２．６厘米。野的范围可从６ｃｍ２取到３０ｃｍ２。方法：蒙特卡罗方法。结果：有两种形式：①研究剂量随深度的变化；②相对剂量（Ｒｅｌａｔｉｖｅｄｏｓｅ）。与Ｐｒｏｗｅｓｓ３０００Ｖｅｒｓ３．０４治疗计划的相应结果比较，此程序所得曲线与Ｐｒｏｗｅｓｓ中曲线基本吻合。结论：本程序应用蒙特卡罗方法模拟能量低于３ＭｅＶ的光子输运具有重要的价值。

关键词：放射疗法钴60源剂量计算蒙特卡罗方法水模体