检索结果-南通市图书馆

Jordan Γ*-Derivation on Semiprime Γ-Ring M with Involution

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

Advances in Linear Algebra & Matrix Theory 2016年第2期6卷 40-50页

作者： Ali Kareem Hajar Sulaiman Abdul-Rahman Hameed majeed School of Mathematical Sciences Universiti Sains Malaysia Penang Malaysia Department of Mathematics University of Baghdad Baghdad Iraq

Let M be a 2-torsion free semiprime G-ring with involution satisfying the condition that ( and ). In this paper, we will prove that if a non-zero Jordan G*-derivation d on M satisfies for all and , then .

关键词： Γ-Ring M with Involution Jordan Γ*-Derivation Commutative Γ-Ring

Kinetics and Thermodynamics of Adsorption Methylene Blue onto Tea Waste/CuFe<sub>2</sub>O<sub>4</sub>Composite

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American Journal of Analytical Chemistry 2013年第7期4卷 1-7页

作者： Saeedeh Hashemian majeed Karimi Ardakani Hamila Salehifar Chemistry Department Islamic Azad University Yazd Branch Yazd Iran

Tea waste/CuFe2O4 (TW/C) composite was prepared by co-precipitation method. The TW and TW/C samples are characterized by FTIR, XRD, SEM and N2 physical adsorption. The results showed that specific surface area of 350 and 570 m2·g?1 for TW and TW/C, respectively. The average pore size of TW/C is ca. 100 nm. Adsorption of methylen blue onto TW/C composite has been studied. Measurements are performed at various contact time, pH and adsorbent dosage. The adsorption kinetics of methylen blue (MB) could be described by the pseudo-second order kinetic model. The adsorption isotherms are described by means of Langmuir and Freundlich isotherms. It was found that the Freundlich model fit better than the Langmuir model. The thermodynamic constants of the adsorption were calculated to predict the nature of adsorption. The values of thermodynamic parameters indicate that a spontaneous and endothermic process was occurred.

关键词： Adsorption CuFe2O4 Composite Kinetic Methylen Blue (MB) Tea Waste Thermodynamic

Green synthesis,characterization,acaricidal,larvacidal,and repellent activities of copper nanoparticles of Astragalus sinicus against Hyalomma anatolicum

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Biomedicine 2023年第6期13卷 250-257页

作者： Hattan S.Gattan Bassam M.Al-Ahmadi Abdullah F.Shater Qais A.H.majeed Maha S.Alazemi Abdullah D Alanazi Department of Medical Laboratory Sciences Faculty of Applied Medical SciencesKing Abdulaziz UniversityJeddahSaudi Arabia Special Infectious Agents UnitKing Fahad Medical Research CenterJeddahSaudi Arabia Department of Biology Faculty of ScienceTaibah UniversitySaudi Arabia Department of Medical Laboratory Technology Faculty of Applied Medical SciencesUniversity of TabukTabuk 71491Saudi Arabia Department of Science College of Basic EducationPAAETPost code 23167AridiyaKuwait Department of Biological Sciences Faculty of Science and HumanitiesShaqra UniversityP.O.Box 1040Ad-Dawadimi 11911Saudi Arabia

Objective:To green synthesize and characterize copper nanoparticles(Cu NPs)using Astragalus sinicus,as well as evaluate the acaricidal,larvacidal,and repellent activities of Cu NPs against Hyalomma anatolicum(***),one of the most prevalent ticks infesting cattle in Saudi ***:Cu NPs were green synthesized by adding the Astragalus sinicus extract to a copper sulfate *** acaricidal,larvicidal,and repellent activities of Cu NPs against *** were assessed via the adult immersion test,the larval packet test,and the vertical movement behavior of tick larvae,*** effects of Cu NPs on acetylcholinesterase as well as oxidative enzyme activities were ***:The green synthesized Cu NPs displayed a spherical form with a size range of 15-75 *** exposure of adult *** to different concentrations of Cu NPs,the viability rate of adult *** and the mean number,weight,and hatchability of eggs were noticeably reduced,in comparison to the control group(P<0.001).In addition,the viability rate of larvae considerably declined(P<0.001)with the LC_(50)and LC_(90)values of 11.30 and 20.34μg/m L,*** maximum repellent activity of Cu NPs was observed at 50,100,and 200μg/m L with complete repellent activity after 60,120,and 180 min of exposure,*** NPs,mainly at 1/2 LC_(50)and LC_(50)concentrations,markedly suppressed the acetylcholinesterase activity of the larval stage of ***(P<0.001).Moreover,Cu NPs,mainly at LC_(50)dose,significantly elevated malondialdehyde level while declining glutathione-S-transferase level in *** larvae(P<0.001).Conclusions:Cu NPs show potent acaricidal,larvicidal,and repellent activities against adults and larvae of ***,further studies must be performed to clarify the precise mechanisms and the efficacy of Cu NPs in practical use.

关键词： Insecticide Tick Pesticide Astragalus sinicus Nanomedicine Hyalomma anatolicum Acaricidal activity Larvacidal activity

Heparin versus Saline Solution for Locking of Totally Implantable Venous Access Port (TIVAP): Cohort Study of the First Kurdistan Series of TIVAP

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Lung Cancer 2014年第4期3卷 67-74页

作者： Aram Baram Goran majeed Hazha Abdullah Allaa Subhi Department of Thoracic and Cardiovascular Surgery Faculty of Medical Sciences School of Medicine University of Sulaimani Sulaymaniyah Iraq Department of Medicine Faculty of Medical Sciences School of Medicine University of Sulaimani Sulaymaniyah Iraq Hewa Center for Medical Oncology Sulaymaniyah Iraq

Introduction: Totally implantable venous access port (TIVAP) is essential prerequisite for most of chemotherapy protocols. Flushing with 0.9% sodium chloride becomes an alternative to heparinized solution. As flushing and locking solutions are still controversial, this study was conducted to compare efficacy of heparinized solution versus normal saline solution for locking in ports TIVAP. Patients and Methods: Prospective Cohort study performed in teaching hospital Sulaymaniyah-University of Kurdistan, Iraq, including 384 TIVAP implanted in cancer and non-cancer patients. The study reports the TIVAP outcome in 2 groups of patients where 2 different solutions used for maintaining catheter’s patency by heparinized solution in group (A), versus normal saline for group (B). Results: In group A, the rate of complications was 8.2% (n = 16) while in group B complications rate was 7.9% (n = 15). Thrombosis in group A occurred in 1.03% of the cases and in group B was 1.57%. There were no significant differences between the two groups regarding the causes for unwanted removals of the TIVAP. Conclusions: The results of our study suggest that heparin has no role in preventing the early or late complications of TIVAP and we do not recommend using it as a locking solution.

关键词： TIVAP Locking Solution Port Thrombosis Surgical Site Infection Kurdistan-Iraq

基于PAN前驱体不同热处理温度制备NCFs及在锂硫电池中的电化学行为

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

新型炭材料 2021年第3期36卷 606-615页

作者：姚山山何燕苹 Arslan majeed 张翠娟沈湘黔黎天保覃事彪江苏大学新材料研究院材料科学与工程学院江苏镇江212013 长沙矿冶研究院有限责任公司动力电池正极材料制备湖南省工程实验室湖南长沙410012

基于电纺聚丙烯腈(PAN)前驱体制备三维氮掺杂炭纳米纤维(NCFs)自支撑集流体,以Li_2S_6溶液为活性物质,研究了不同热处理温度下制备的NCFs理化性能及其在锂硫电池中的电化学行为。结果表明,热处理温度为900℃时,制备的NCFs(NCFs-900)表... 详细信息

基于电纺聚丙烯腈(PAN)前驱体制备三维氮掺杂炭纳米纤维(NCFs)自支撑集流体,以Li_2S_6溶液为活性物质,研究了不同热处理温度下制备的NCFs理化性能及其在锂硫电池中的电化学行为。结果表明,热处理温度为900℃时,制备的NCFs(NCFs-900)表现出优异的电化学性能。当载硫量为4.19 mg·cm~(-2)时,NCFs-900@Li_2S_6电极在0.2C下,初始放电容量为875 mAh·g~(-1),经250周循环后仍有707 mAh·g~(-1),库伦效率为98.55%。同时在高倍率1 C下循环150周后容量保持率为81.53%。

关键词：聚丙烯腈氮掺杂炭纳米纤维热解温度电化学行为

借鉴国际经验构建适合中国国情的碳排放交易制度研究

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

借鉴国际经验构建适合中国国情的碳排放交易制度研究

作者： Mejdi Y.majeed 清华大学

学位级别：硕士

从可观测与预测到的损失来看，气候变化负面影响已经空前增长，气候变化不再仅仅是普通的环境问题。就中国巨大的人口、粮食生产以及经济发展而论，中国非常容易受气候变化的负面影响。在这一背景下，碳排放交易体系(ETS)作为一个以市... 详细信息

从可观测与预测到的损失来看，气候变化负面影响已经空前增长，气候变化不再仅仅是普通的环境问题。就中国巨大的人口、粮食生产以及经济发展而论，中国非常容易受气候变化的负面影响。在这一背景下，碳排放交易体系(ETS)作为一个以市场为基础的减缓气候变化的政策越来越受到决策者的关注，因为它能作为命令与控制机制的替代方案、以一种经济的方式快速地限制人为温室气体排放。本研究通过大量的文献调研与专家访谈，采用比较分析法来实现以下目的：进一步深入理解欧洲碳排放交易体系，东京都总量控制与交易体系和区域温室气体减排行动如何运行;利用他们的经验来优化中国的碳排放交易试点计划;指出碳排放交易计划的设计中应当考虑人类对气候系统的危险干涉行为;获得关于如何尽可能快速和高效的在国家范围内建立中国的碳排放交易计划的见解;并为中国的碳排放交易计划与它邻国的碳排放交易计划结合起来奠定基础。本研究得出以下结论：欧洲碳排放交易体系，东京都总量控制与交易体系和区域温室气体减排行动与《联合国气候变化框架公约》(UNFCCC)中的第二条款不一致;中国的碳排放交易试点工程缺乏一些能与《联合国气候变化框架公约》第二条款一致的基本元素;为了使中国的国家碳排放交易体系与《联合国气候变化框架公约》第二条款更加一致，需要基于以下三大关键因素调整目标，三大关键因素分别为：控制关键弱点性、全球平均地表气温的上升不应超出工业化前平均温度以上2°C、政府间气候变化专门委员会做好场景分类工作;采用绝对的限额交易要在相关部门的监管下建立自愿进行早期的温室气体减排的系统与短期的奖励机制，然后宣传相关责任实体的减排计划来使公众参与，同时达到覆盖长期人为的和主要的温室气体排放来源的强制性计划;在符合《联合国气候变化框架公约》第二条款的情况下，落实如下分配机制。在制定溯往原则的基础上，确定基准点，进行竞投;以实现《联合国气候变化框架公约》第二条款为目的、基于标准化衡量方法与持续改进方法的原则，引进“三可”（可检测、可报告、可核查）机制，同时应关注监视方法，数据收集处理系统以及详细检查监督规则。

关键词：气候变化 UNFCCC第二条款关键脆弱性中国碳排放交易体系

Computational Modelling of the Hydride Generation Reaction in a Tubular Reactor and Atomization in a Quartz Cell Atomizer

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

Journal of Analytical Sciences, Methods and Instrumentation 2012年第3期2卷 126-139页

作者： Wameath S. Abdul-majeed William B. Zimmerman Department of Chemical and Biological Engineering The University of Sheffield Sheffield UK Department of Chemical and Biological Engineering The University of Sheffield Sheffield UK.

In this study, we present a model whereby the centre of the atomization channel is shown to be the optimal location for the spectrometric data acquisition in a quartz cell atomizer. The study aims to explore the hydride generation technique which is normally coupled with efficient thermal source to apply determination of heavy metals in water samples via spectrometric analysis. The arsenic hydride generation process and the atomization of the generated hydride in a quartz cell atomizer were studied analytically as model case studies. The hydride generation (HG) process was analyzed by adopting two hypotheses, the nascent hydrogen and formation of intermediate hydroboron species, where the results based on the second hypothesis are found to be more realistic for design purposes. Moreover, the release of the generated hydride from the liquid phase and their transport to the gas phase is simulated in a helical tubular section, in which the actual tubular section length required for separation is deduced. The analytical results have been verified experimentally by measuring the signal intensity for the free arsenic atoms against several reaction tube lengths, in which increasing the tubular section length from 12 cm to 100 cm results in signal amelioration by no more than 6.6%. Furthermore, the atomization of the hydride and the distribution of the generated free atoms are deduced in two configurations of tubular quartz atomizers. The results obtained from both studied cases illustrate that a high concentration of the free analyte atoms is generated in the first part of the atomization channel, saturates to a maximum in a position at the atomizer centre, and dissipates at the inside wall of the tubular atomizer before reaching the atomizer outlet edge, which is found to be in total agreement with the current understanding of atomization mechanism in tubular atomizer and emphasizes the fact that the centre of the quartz cell atomizer is the best location for the spectrom

关键词： Hydride Generation Process Tubular Reactor Quartz Cell Atomizer Emission Spectroscopy

识别具有高失明和截肢风险的糖尿病患者——一个新的风险评估工具，有助于个体化照护、提供建议、将资源定向于最需要帮助的人群

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

英国医学杂志中文版 2016年第3期19卷 121-122页

作者： Azeem majeed Mariam Molokhia 沈赟包玉倩 Department ofPrimary Care andPublic Health Imperial CollegeLondon LondonW6 8RP UK Department ofPrimary Care andPublic HealthSciences King'sCollege LondonLondon SE1 3QD UK 上海交通大学附属第六人民医院内分泌代谢科

失明和下肢截肢是最令人恐惧的糖尿病并发症。尽管这些并发症的发病率高、对患者的影响很大，但目前缺乏用于识别有极高风险失明和截肢的糖尿病患者的方法。最近Julia Hippisley—Cox和Carol Coupland的研究（见本期第123页；doi：10．1... 详细信息

失明和下肢截肢是最令人恐惧的糖尿病并发症。尽管这些并发症的发病率高、对患者的影响很大，但目前缺乏用于识别有极高风险失明和截肢的糖尿病患者的方法。最近Julia Hippisley—Cox和Carol Coupland的研究（见本期第123页；doi：10．1136／bmj．h5441）填补了这一空白，该研究使用的数据来自于QResearch，一个大型临床数据库，源自于英国全科医疗所使用的电子病历记录。

关键词：糖尿病并发症高失明风险截肢风险全科医疗数据集

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

PSAT中自动发电控制功能的设计与实现

PSAT中自动发电控制功能的设计与实现

作者： Sarmad majeed Malik（马里克）华北电力大学

学位级别：硕士

随着智能电网在世界范围内的广泛发展,大量研究工作集中在如何优化智能电网在当前电力系统中的作用。由于传统能源资源的限制,如何将风能等可再生能源接入智能电网成为了研究的重点。但由于可再生能源的间歇性以及不断变化,这给智能电... 详细信息

随着智能电网在世界范围内的广泛发展,大量研究工作集中在如何优化智能电网在当前电力系统中的作用。由于传统能源资源的限制,如何将风能等可再生能源接入智能电网成为了研究的重点。但由于可再生能源的间歇性以及不断变化,这给智能电网带来了更大的挑战。自动发电控制(AGC)是应对这一挑战的重要措施。自动发电控制(AGC)被用于维持电力系统中发电粤用电的平衡。考虑到可再生能源发电的随机性,设计一个有效的AGC来维持发电与用电的平衡就变得至关重要。AGC主要的功能是通过调节发电机有功功率来维持电力系统频率的稳定。目前,对于AGC的实现已有很多软件可以完成,但利用电力系统分析工具包(PSAT)则还没有。PSAT是用于电力系统仿真的MATLAB工具箱,它具有多种功能,如：小信号稳定分析、时域仿真、连续潮流、最优潮流以及潮流计算。但是它并没有AGC功能。本论文采用神经网络和PID控制器,利用PSAT实现了AGC,为PSAT增添了AGC功能。论文利用IEEE14节点网络算例对本文设计的AGC进行了验证,结果表明所设计的AGC功能良好,能够对系统频率起控制作用。同时,作为PSAT中的新功能,所设计的AGC也适用于其他电力系统。

关键词：自动发电控制(AGC) 电力系统仿真工具箱(PSAT) 人工神经网络(ANN) 可再生能源区域控制偏差(ACE)