检索结果-南通市图书馆

Mechanical and magneto-electronic properties of europium lanthanide-based cubic perovskites EuYO_(3)(Y=Cr, Mn, Fe): An ab initio study

引用

Journal of Rare Earths 2024年第3期42卷 562-569,I0005页

作者： Hayat Ullah Azra Sarwar Sajad Ali rabah khenata Abdelmadjid Bouhemadou Saad Bin-Omran Department of Physics Women University of Azad Jammu&Kashmir Bagh 10250Pakistan Department of Physics Abdul Wali Khan UniversityMardan23200KPPakistan LPQ3M Laboratory Institute of Science and TechnologyUniversity of Mascara29000MascaraAlgeria Laboratory for Developing New Materials and Their Characterization Farhat Abbas University Setif l19000SetifAlgeria Department of Physics and Astronomy College of ScienceKing Saud UniversityP.O.Box 2455Riyadh11451Saudi Arabia

Computational calculations using density functional theory(DFT) were performed for the first time using the full potential linearized augmented plane wave plus local orbital method(FP-LAPW + LO) to determine the structural, elastic, electronic and magnetic properties of europium-based cubic perovskites EuYO_(3)(Y=Cr, Mn, Fe). The exchange correlation potentials of GGA along with some analytical methods were adopted for the computation of structural and elastic properties. Moreover, the GGA + U formalism was also added for obtaining more precise electronic and magnetic properties, particularly to address the Eu-4f and Y-3d orientations in the spin-polarized double cell symmetry. The observed lattice parameters of these compounds are consistent with experiment. The observed bulk moduli predict that EuCrO_(3) is harder and less compressible than EuMnO_(3) and EuFeO_(3). The calculated tolerance factors of these compounds are within the cubic symmetry range. Our computed critical radius of EuCrO_(3) shows that EuCrO_(3) has a larger migration energy. Based on their elastic properties, these compounds are ductile in nature. We also computed the thermal properties of these compounds. The band structures and density of states show that these compounds are metallic in character. The lowest ground state energy and magnetic moments of these compounds expose their ferromagnetic nature. The metallic nature and strong ferromagnetism of these compounds make them promising applicants for application in spintronic.

关键词： Perovskites GGA+U Elastic constants Band structure Magnetic moments Rare earths

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Structural and Electronic Properties Calculations of Al xIn1-x P Alloy

引用

Materials Sciences and Applications 2011年第7期2卷 729-737页

作者： Mohammed Ameri Ali Bentouaf Mohammed Doui-Aici rabah khenata Fatima Boufadi Amina Touia 不详

The equilibrium structure and the electronic properties of III-V zinc-blende AlP, InP semiconductors and their alloy have been studied in detail from first-principles calculations. A full-potential linear muffin-tin-orbital (FP-LMTO) method has been used in conjunction with both the local-density approximation (LDA) and the generalized-gradient approximation (GGA) to investigate the effect of increasing the concentration of aluminum on the structural properties such as the lattice constants and the bulk moduli. Besides, we report the concentration dependence of the electronic band structure, the direct-indirect band gap crossovers and bowing. Using the approach of Zunger and co-workers the microscopic origins of the gap bowing were also explained. A reasonable agreement is found in comparing our results with other theoretical calculations.

关键词： AlP InP Semiconductors FP-LMTO Bowing Alloys

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

FP-LMTO Investigation of the Structural and Electronic Properties of CuxAg1–xI Alloys

引用

Materials Sciences and Applications 2011年第7期2卷 748-756页

作者： Mohammed Ameri Noureddine Bouzouira Mohammed Doui-Aici rabah khenata Abdelkader Yakoubi Mohammed Maachou 不详

The structural and electronic properties of the ternary CuxAg1–xI, alloy have been calculated, using the full-potential linear muffin-tin-orbital (FP-LMTO) method based on density functional theory, within both the local density approximation and the generalized gradient approximation (GGA). The equilibrium lattice constants and the bulk modulus are compared with previous theoretical calculations. The concentration dependence of the electronic band structure and the direct-indirect band gaps is also investigated. Using the approach of Zunger and co-workers the microscopic origins of the gap bowing were also explained.

关键词： (FP-LMTO) Method CuxAg1–xI Alloy

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Numerical Modeling and Technico-Economic Analysis of a Hybrid Energy Production System for Self-Consumption: Case of Rural Area in the Comoros

引用

Journal of Power and Energy Engineering 2024年第5期12卷 24-59页

作者： Fahad Maoulida Mohamed Aboudou Kassim rabah Djedjig Ahmed Ihlal Mohammed El Ganaoui LERMAB Laboratory of Studies and Research on Wood Material IUT of Longwy University of Lorraine Cosnes-et-Romain Longwy France LEMA Energy and Applied Mechanics Laboratory Faculty of Sciences and Techniques University of Comoros Moroni Comoros IREMIS Institute University of Mayotte Mayotte France LMER Laboratory of Materials and Renewable Faculty of Sciences University Ibn Zohr BP Agadir Morocco

This study aims to provide electricity to a remote village in the Union of Comoros that has been affected by energy problems for over 40 years. The study uses a 50 kW diesel generator, a 10 kW wind turbine, 1500 kW photovoltaic solar panels, a converter, and storage batteries as the proposed sources. The main objective of this study is to conduct a detailed analysis and optimization of a hybrid diesel and renewable energy system to meet the electricity demand of a remote area village of 800 to 1500 inhabitants located in the north of Ngazidja Island in Comoros. The study uses the Hybrid Optimization Model for Electric Renewable (HOMER) Pro to conduct simulations and optimize the analysis using meteorological data from Comoros. The results show that hybrid combination is more profitable in terms of margin on economic cost with a less expensive investment. With a diesel cost of $1/L, an average wind speed of 5.09 m/s and a solar irradiation value of 6.14 kWh/m2/day, the system works well with a proportion of renewable energy production of 99.44% with an emission quantity of 1311.407 kg/year. 99.2% of the production comes from renewable sources with an estimated energy surplus of 2,125,344 kWh/year with the cost of electricity (COE) estimated at $0.18/kWh, presenting a cost-effective alternative compared to current market rates. These results present better optimization of the used hybrid energy system, satisfying energy demand and reducing the environmental impact.

关键词： Hybrid System Rural Area Electrification Comoros Techno-Economic Analysis PV-Wind-Diesel-Battery Meteorological Data HOMER Energy Pro

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

NLO response of derivatives of benzene, stilbene and diphenylacetylene：MP2 and DFT calculations

引用

Chinese Journal of Chemical Engineering 2017年第6期25卷 800-808页

作者： A.M. Elhorri M. Zouaoui-rabah Laboratoire de Microscopie Microanalyse et Spectroscopie Mol&ulaire Faculty of Sciences Djillali Liabes University of Sidi-Bel-Abbes 22000 Sidi-BeI-Abbes Algeria

MP2 method and different functionals such as M06-HF, M06-2X, CAM-B3 LYP, PBE0, B3 LYP and M06 L incorporating different XC amounts were used to calculate the static first hyperpolarizabilies β(0) of eight molecules which are derivatives of benzene, stilbene and diphenylacetylene. The values were then compared to the experimental ones. The M06-2X functional was then selected for further calculations. NBO calculations were also performed to define the intramolecular charge transfer in each molecule. TD-DFT calculations were performed taking into account the solvent effect using the IEF-PCM formalism. Some parameters characterizing the vertical transitions such as the wavelength of the maximum absorption λ_(max) were compared to the experimental ones. Finally,solvation Gibbs free enthalpy ΔG_(solv) values have also been examined in order to determine which the specific solvent for a given molecule is.

关键词： First hyperpolarizability DFT TD-DFT Push-pull molecules NBOCharge transfer

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Adaptive leader follower control for multiple quadrotors via multiple surfaces control

引用

Journal of Beijing Institute of Technology 2016年第4期25卷 526-532页

作者： ABBAS rabah 伍清河 School of Automation Beijing Institute of Technology

Based on the multiple surface and fixed undirected communication topology, the adaptive leader follower contrul for multiple quadrotors is discussed. Our approach is based on leader follower architecture. Multiple surface control （MSC） is used to design consensus controller to make multiple quadrotors construct a formation during flying with the presence of uncertainty item caused by the ground effect during landing or taking off. Simulation results are presented to validate the effectiveness of the proposed controller.

关键词： quadrotor leader follower multiple surface control (MSC) unmanned aerial vehicle(UAV)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Clicking ferrocene to halogenated boron-doped diamond surfaces

引用

Rare Metals 2013年第1期32卷 100-104页

作者： Mei Wang Sabine Szunerits rabah Boukherroub Mu-Sen Li Key Laboratory of Liquid Structure and Heredity of Materials Ministry of Education Shandong University Institute of Interdisciplinary Research (IRI USR-CNRS 3078) and Institute of Electronics Microelectronics and Nanotechnology (IEMN UMR-CNRS 8520) Cite Scientifique Avenue Poincare-BP 60069 59652 Villeneuve d'Ascq France

The halogenated boron-doped diamond （BDD） surfaces were reacted with sodium azide through a nucle- ophilic substitution reaction. The resulting azide-terminated BDD surfaces were used to trigger the ＂click＂ reaction. Because of the attractive electrochemical properties of ferrocene-containing molecules, such as fast electron transfer rates, reversible redox activities, and favorable redox potentials, we show that ferrocene derivatives can be grafted onto non-oxidized diamond surfaces by ＂click chemistry＂. These redox-active ferrocene-containing layers on a BDD surface, because of their ability to store and release charges reversibly, have the potential to be used as hybrid molecular/semiconductor memory devices.

关键词： Halogenated Azide Click chemistry Ferrocene

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

On-board measurement of emissions from liquefied petroleum gas,gasoline and diesel powered passenger cars in Algeria

引用

Journal of Environmental Sciences 2014年第8期26卷 1651-1659页

作者： Saadane Chikhi Ménouèr Boughedaoui rabah Kerbachi Robert Joumard Department of Industrial Chemistry Faculty of TechnologyUniversity of Blida 1Route de SoumaaBlida 09000Algeria Environmental Science and Technology Laboratory National Polytechnic School of AlgiersAlgiers 16200Algeria Transport and Environment Laboratory IfsttarBronFrance

On-board measurements of unit emissions of CO,HC,NOx and CO2 were conducted on 17 private cars powered by different types of fuels including gasoline,dual gasoline–liquefied petroleum gas（LPG）,gasoline,and diesel. The tests performed revealed the effect of LPG injection technology on unit emissions and made it possible to compare the measured emissions to the European Artemis emission model. A sequential multipoint injection LPG kit with no catalyst installed was found to be the most efficient pollutant reduction device for all of the pollutants,with the exception of the NOx. Specific test results for a sub-group of LPG vehicles revealed that LPG-fueled engines with no catalyst cannot compete with catalyzed gasoline and diesel engines. Vehicle age does not appear to be a determining parameter with regard to vehicle pollutant emissions. A fuel switch to LPG offers many advantages as far as pollutant emissions are concerned,due to LPG＇s intrinsic ***,these advantages are being rapidly offset by the strong development of both gasoline and diesel engine technologies and catalyst converters. The LPG＇s performance on a chassis dynamometer under real driving conditions was better than expected. The enforcement of pollutant emission standards in developing countries is an important step towards introducing clean technology and reducing vehicle emissions.

关键词： Unit emission Pollutant Vehicle On-board measurement LPG Gasoline Diesel

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Cardiac involvement in disseminated diffuse large B-cell lymphoma,successful management with chemotherapy dose reduction guided by cardiac imaging: A case report and review of literature

引用

World Journal of Clinical Cases 2019年第2期7卷 191-202页

作者： rabah Al-Mehisen Maha Al-Mohaissen Hisham Yousef Department of Cardiology Security Forces Hospital Department of Clinical Sciences (Cardiology) Princess Nourah Bint Abdulrahman University Research Chair in Cardiovascular Disease in Women Princess Nourah Bint Abdulrahman University Department of Internal Medicine Division of Hematology/Oncology Security Forces Hospital

BACKGROUND Secondary cardiac involvement by lymphoma has received limited attention in the medical literature, despite its grave prognosis. Although chemotherapy improves patients' survival, a subgroup of treated patients dies suddenly due to myocardial rupture following chemotherapy initiation. Reducing the initial chemotherapy dose with dose escalation to standard doses may be effective in minimizing this risk but the data are limited. We report on the successful management of a patient with disseminated diffuse large B-cell lymphoma(DLBCL) involving the heart using such *** SUMMARY An 18-year-old male presented to our hospital with six months history of progressive dyspnea, orthopnea and cough. On physical examination, the patient was found to have a plethoric and mildly edematous face, fixed elevation of the right internal jugular vein, suggestive of superior vena cava obstruction, and a pelvic mass. Investigations during admission including a thoracoabdominal computed tomography(CT) scan with CT guided biopsy of the pelvic mass,echocardiography and cardiac magnetic resonance imaging led to the diagnosis of disseminated DLBCL with cardiac involvement. The patients were successfully treated with chemotherapy dose reduction followed by dose escalation to standard doses, under the guidance of cardiac imaging. The patient completed chemotherapy and underwent a successful bone marrow transplant. He is currently in remission and has a normal left ventricular *** Imaging-guided chemotherapy dosing may minimize the risk of myocardial rupture in cardiac lymphoma. Data are limited. Management should be individualized.

关键词： Diffuse large B-cell lymphoma Cardiac lymphoma Cardiac imaging Cardiac magnetic resonance imaging Myocardial rupture Imaging-guided chemotherapy Case report

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Study and Design of a Rocket Motor Inner Flow Field Simulation for the Case of Dual Pulse Motor

Study and Design of a Rocket Motor Inner Flow Field Simulati...

引用

作者： TOUIOUI rabah 南京理工大学

学位级别：硕士

固体火箭推进至今仍然是最为常用的推进技术,这是因为它比其他推进技术(如,液体火箭推进技术)呈现出许多优势,主要是设计简单、结构紧凑、操作准备周期短及更长的储存时间。但是,虽然这是最成熟的推进技术,但在这一领域的研究仍在进行,... 详细信息

固体火箭推进至今仍然是最为常用的推进技术,这是因为它比其他推进技术(如,液体火箭推进技术)呈现出许多优势,主要是设计简单、结构紧凑、操作准备周期短及更长的储存时间。但是,虽然这是最成熟的推进技术,但在这一领域的研究仍在进行,直到今天,因为不同于液体推进剂燃烧,固体推进剂燃烧不能随时进行调整,以产生实时所需的推力。虽然有推力调节的一些方法,例如改变燃烧表面积或使用不同类型的推进剂,但当它需要更多的实际应用时,这些技术就略显不足。近年来提出了一种通过脉冲隔离装置(PSD)将燃烧室内装药独立分开以获得不同推力的技术,比如,第一脉冲药柱用于助推,后续药柱用于续航,这一类固体火箭发动机称作双(多)脉冲固体火箭发动机。在本文的研究中。在第一阶段,已经提出了一种双脉冲固体火箭发动机的初步设计,允许其分成几个基本单元(或模块)并包含其制造过程。在后一阶段,进行了一个阶段的稳态数值模拟,研究了 PSD(脉冲分离装置)类型(考虑轴向和径向两种类型)和推进剂药柱内径对燃烧室内部流动特性的影响。基于ANSYS FLUENT商业软件进行了仿真研究。计算中,采用了k-ω SST湍流模型,并假设燃烧产物是理想气体。结果表明,在不同的几何构型条件下,第一脉冲燃烧室内流场差别不大。而第二脉冲燃烧室内流线、压力分布、湍流动能、轴向速度分布和轴向剪切应力的分析显示出更显著的差异。事实上,在轴向PSD类型的隔离装置条件下,流场参数变化较大,湍流动能较高且轴向速度急剧下降。另一方面,在径向PSD类型的隔离装置条件下,燃烧室内流场参数更加稳定。

关键词：固体火箭发动机设计双脉冲火箭发动机内流场模拟

来源：

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：