检索结果-南通市图书馆

Pronounced effect of ZnTe nanoinclusions on thermoelectric properties of Cu_(2-x) Se chalcogenides

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

Science China Materials 2016年第2期59卷 135-143页

作者： Muhammad Umer Farooq sajid Butt 高克玮孙喜贵庞晓露 Asif Mahmood Waqar Mahmood sajid U.Khan Nasir Mahmood School of Materials Science and Engineering University of Science and Technology Beijing Department of Materials Science and Engineering Institute of Space Technology State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Department of Material Science and Engineering College of Engineering Peking University Department of Physics Thin Film Technology (TFT) Research LaboratoryCOMSATS Institute of Information Technology Department of Materials Science and Engineering Institute of Space Technology Institute of Superconducting and Electronic Materials Australian Institute of Innovative MaterialsUniversity of Wollongong

Metal chalcogenides especially Cu2-x Se has gained much attention in thermoelectric community due to its complex crystal structure and superionic behavior. Here, we report a facile method to improve the thermoelectric efficiency by introducing Zn Te nanoinclusions into the matrix of Cu2-x Se. As a result, a substantial improvement of 32% in electrical conductivity of Cu2-x Se-Zn Te composite is observed. The increase in electrical conductivity is at the expense of Seebeck coefficient, which slightly decreases the power factor of the composite samples than that of pure Cu2-x Se. Furthermore, the introduction of secondary phase facilitates in declining the total thermal conductivity of Cu2-x Se-Zn Te composite up to 34% by suppressing the lattice thermal contributions. Thus, the moderate power factor and lower thermal conductivity values result in an improved figure of merit(z T) value of ~0.40 in mid-range temperature(750 K) for Cu2-x Se-Zn Te composite with 10 wt.% of Zn Te, which is about 40% higher than that of its pure counterpart. Hence, it is believed that the incorporation of Zn Te nanoinclusions in the matrix of Cu2-x Se may be an important route to improve the thermoelectric properties of Cu2-x Se based compounds.

关键词： ZnTe nanoparticles Cu2S thermoelectric materialas Cu2-xSe-ZnTe composite thermal conductivity

绿茶多酚对高脂饮食诱导肥胖犬的肠道菌群及肠道炎症变化的干预作用

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

绿茶多酚对高脂饮食诱导肥胖犬的肠道菌群及肠道炎症变化的干预作...

作者： sajid Ur Rahman 安徽农业大学

学位级别：硕士

高脂饮食能改变肠道微生物群,促进与肥胖相关的炎症,而绿茶多酚(GTPs)对肥胖和肠道炎症有预防作用,但其作用机制及其与肠道微生物群的关系尚不清楚。因此,本研究以GTPs治疗肥胖症和肠道炎症为背景,探讨GTPs对肠道微生物群的作用及其抗... 详细信息

高脂饮食能改变肠道微生物群,促进与肥胖相关的炎症,而绿茶多酚(GTPs)对肥胖和肠道炎症有预防作用,但其作用机制及其与肠道微生物群的关系尚不清楚。因此,本研究以GTPs治疗肥胖症和肠道炎症为背景,探讨GTPs对肠道微生物群的作用及其抗炎机制。本试验选取30只13-14月龄、健康雄性比格犬,正常饲养1个月后随机分为5组,每组6只。以低(0.48%)、中(0.96%)、高(1.92%)剂量的GTP喂养试验犬18周,夜间空腹12小时后采集血液样品。分离血清,于-80℃下保存,用于分析炎性细胞因子。试验结束时,每组随机选择4只犬,按体重分别用盐酸甲苯噻嗪(1.5mg/kg,IM)和(20mg/kg,IV)硫喷妥钠(Abbott)麻醉,放血致死。打开腹腔,收集肠内容物,立即保存于福尔马林和液氮中,用于进一步分析。采用高通量测序技术测定肠道微生物变化;实时荧光定量PCR(qRT-PCR)检测肠道炎性细胞因子mRNA的表达水平,酶联免疫吸附法(ELISA)检测肠道炎性细胞因子含量;免疫印迹法检测Toll样受体4(TLR4)、环氧合酶-2(COX-2)、诱导型一氧化氮合酶(iNOS)的表达水平;苏木精-伊红(H&E)染色检测肠道组织验证变化。试验结果显示:试验结果显示:1.与高脂饮食组相比,GTPs降低了拟杆菌和梭杆菌的相对丰度,并增加了厚壁菌的相对丰度。氨基酸球菌属、厌氧螺菌属、厌氧弧菌、类杆菌、布劳特氏菌属、环杆菌、柠檬酸杆菌、梭状芽胞杆菌以及大肠杆菌的相对比例与GTP诱导的体重下降显著相关。2.与正常饮食组相比,高脂饮食组中TNF-α,IL-6和IL-1 β的mRNA表达显着(P<0.05)或极显著(P<0.01)增加;与高脂肪饮食组相比,GTPs添加组TNF-α、IL-6和IL-1 β mRNA表达水平显著(P<0.05)或极显著(P<0.01)降低。与正常饮食组相比,高脂饮食组的TNF-α浓度显着升高(P<0.05);与高脂饮食组相比,GTPs高剂量组中TNF-α浓度显着降低(P<0.01)。与正常饮食组相比,高脂肪饮食组的IL-6浓度显着升高(P<0.01);与高脂肪饮食组相比,GTPs高剂量组中IL-6浓度显着降低(P<0.05)。高脂饮食组与正常饮食组IL-1 β浓度差异不显著;然而,与高脂饮食组相比,GTPs高剂量组的IL-1 β浓度显著降低(P<0.01)。***还抑制TLR4信号传导途径。与高脂饮食组相比,添加GTP可抑制犬肠道组织中Cox-2的表达,高脂饮食组显着增加COX-2的表达(P<0.05)。此外,结果显示,在连续饲喂GTP 18周后,GTPs高剂量组中iNOS水平显着降低(P<0.05)。4.正常饮食组肠壁结构完整,黏膜形态无异常,具有完整的单柱状上皮。在高脂肪饮食组中,小肠(回肠)壁显着延伸并且绒毛内乳腺扩张,而饲喂GTP的犬没有表现出炎症或淋巴管扩张,且在高GTP剂量组中可清楚地观察到派尔斑。综上所述,GTPs的治疗作用与肠道微生物丰度和肠道炎症的变化有相关性,这可能与GTPs的抗炎和抗肥胖机制有关。同时,试验结果表明,高脂饮食会改变肠道微生物多样性,导致肥胖和炎症,而添加GTPs对肥胖和肠道内环境失调具有显著改善作用。

关键词：绿茶多酚肥胖犬肠道微生物群炎性细胞因子肠道炎症

High Temperature Separation of Hydrogen from Mixture of Gases by Using Microporous Silica Membranes

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

材料科学与工程（中英文B版） 2011年第1期1卷 90-96页

作者： sajid Hussain Shah Yoshimitsu Uemura SuzanaYusup Katsuki Kusakabe Department of Chemical Engineering Universiti Teknologi PETRONAS Bander Seri Iskandar Tronoh 31750 Malaysia Department of Living Environmental Science Fukuoka Women＇s University 1-1-1 Kasumigaoka Higashi-ku Fukuoka 813-8529Japan

This paper presents a review on the aspect of using microporous silica membranes for the separation of hydrogen from process streams. It includes an overview of recent literature and advancement and hurdles for hydrogen separation from mixture of gases. Ceramic membranes derived both from sol-gel and chemical vapor deposition (CVD) methods were discussed and compared their properties, preparation and performance in gas separation at an elevated temperature in the presence of steam or vapors.

关键词：气体分离性能二氧化硅膜高温蒸汽微孔混合氢化学气相沉积分离过程

Tea Polyphenols Reducing Lipopolysaccharide-induced Inflammatory Responses in RAW264.7 Macrophages via NF-κB Pathway

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2019年第6期35卷 1105-1110页

作者： SU Siyi LI Xiaoyu GUO Xu ZHOU Ruiming LI Manman MING Pengfei HUANG Yingying sajid Ur RAHMAN DING Hongyan FENG Shibin LI Jinchun WANG Xichun LI Yu WU linjie College of Animal Science and Techmology Anhui Agricultural UniversityHefei 230036P.R.China

The anti-inflammatory activity of tea polyphenols(TPs)in RAW264.7 macrophages stimulated by lipopolysaccharide(LPS)was investigated in this ***264.7 macrophages were treated with different concentrations of TP(0,12.5,25,50,100,and 200μg/mL)and then stimulated by *** blank control group was set *** expression of pro-inflammatory cytokines associated with the nuclear factor-kappa B(NF-κB)signaling pathway was investigated before and after TP *** of RAW264.7 cells with TP decreased the expression of tumor necrosis factor-α(TNF-α),interleukin-6(IL-6)and interleukin 1 beta(IL-1β)pro-inflammatory *** addition,TP inhibited the phosphorylation of p65 and IκB by blocking the phosphorylation and the degradation of NF-κB inhibitor *** conclusion,TP exerts anti-inflammatory effects by regulating the release of inflammatory mediators via the NF-κB signaling pathway.

关键词： Tea polyphenol Inflammatory response,RAW264.7 Nuclear factor-kappa B pathway

Building a Geodatabase for Parcel and Cadaster Mapping and Add-Ins Development: A Case Study for Defense Housing Authority (DHA), Lahore, Pakistan

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Geographic Information System 2015年第6期7卷 588-597页

作者： Mamoon Ur Rasheed sajid Rashid Ahmad Rashid Saleem College of Earth and Environmental Sciences University of the Punjab Lahore Pakistan

This paper presents a systematic view of most up-to-date tools, technologies and techniques which is appropriate not only for effective decision making, but also helpful for competent administration to provide efficient resolution for spatial troubles of Khasra and Parcel management. Different Data collection techniques have been applied on different data sources. Worldview II of 0.5 resolution image, scanned Master Plan and Cadastral/Khasra Maps was used for development of geodatabase for spatial and non-spatial entities using ArcGIS 10.2. Multiple processing on Satellite Imagery using ERDAS Imagine was performed like Image enhancement, Mosaicking and Color Balancing, Image Geo-referencing and Raster Cataloging. Development of Customize Graphical User Interface (GUI) for DHA’s officials and administrator makes efficient decision in society matters. This is the first spatial GUI, for DHA to plan and maintain society’s activities efficiently, in the form of ArcMap Add-Ins. These Add-Ins are written in C#.Net using ArcObjects APIs within MSVS 2012.

关键词： Khasra Parcel ArcMap Add-Ins ArcObjects Geodatabase

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

沸石咪唑化合物ZIF-8的合成和吸附性能

沸石咪唑化合物ZIF-8的合成和吸附性能

作者： Arain sajid U Rahman 北京化工大学

学位级别：硕士

水是一种必不可少的物质,是对地球生命的不可或缺条件。如今,全球正面临着严重的水质问题.各种工业活动的废水是造成环境污染的重要原因,因为工业废水中含有较高浓度的重金属离子。重金属由于其毒性,有很大的影响生物有机体.目前,用:于... 详细信息

水是一种必不可少的物质,是对地球生命的不可或缺条件。如今,全球正面临着严重的水质问题.各种工业活动的废水是造成环境污染的重要原因,因为工业废水中含有较高浓度的重金属离子。重金属由于其毒性,有很大的影响生物有机体.目前,用:于去除重金属离子的许多水处理技术是商业上应用的,例如化学沉淀,膜过滤,离子交换,电化学过程,和吸附过程,解决水问题。吸附是废水处理的主要方法之一。重金属去除有几个优点。多孔材料是经济的重要部分,通常考虑开发和设计多孔材料以具有通用性能。沸石咪唑酸酯骨架-8 ZIF-8材料由于其可行的结构和性能而获得了更多的兴趣,并且具有高的不同应用能力。在这项研究工作中,我们选用了 ZIF-8材料,它具有良好的晶体结构,如沸石材料,这是一种MOFs材料。我们专注于ZIF-8材料的合成,并赋予其去除重金属离子的吸附性能。最初,通过溶剂热法合成ZIF-8材料,其中含有锌作为金属离子和2-甲基咪唑作为配体,二甲基甲酰胺用于修饰反应的演化。使用了各种表征技术,如XRD,SEM和FT-IR,探讨合成ZIF-8样品的特性.在吸附过程中研究去除离子废水中重金属离子来探究合成ZIF-8的吸附性能。结果表明ZIF-8被提出作为去除重金属离子(HMI)的有效吸附材料,包含Zn,Cu,Pb,Cd和Ni.此外我们也探究了一些重要的操作参数的影响(溶液的pH值,浓度HMIs,吸附时间,和吸附剂用量)吸附性能研究(吸附容量和去除率)也被调查。所以,它解释了当溶液的pH值很高时,功能组的质子化程度很强,竞争离子H降低,化学复合物相互作用增加。因此,ZIF-8具有很高的吸附量大的重金属离子HMIs的能力。平衡吸附时间Cu,Zn,Pb,Cd和Ni分别为 25,5,15,5 45 和 10 h,HMI 的饱和吸附容量分别为 481.9,249.6,1184.8,812.8 和 247.2 mg·g,分别.我们将这一结果与文献比较,发现该结果优于天然和人造吸附剂,如活性炭,沸石,稻壳,泥炭等。ZIF-8和ZIF-8与离子粉末的XRD和FT-IR表征,揭示吸附过程前后晶体结构发生变化,并表明吸附是离子交换层析,也可能发生化学复合物相互作用。因此,发现物理吸附除外还有化学吸附。在这部分研究中,初步吸附机理证明,将实验数据与吸附等温线和动力学方程相关联,并检查吸附过程中的离子交换。通过这项研究,我们知道吸附过程与朗缪尔模型有很好的相关性。五个金属离子的K顺序是,Pb>Zn>Cu>Cd>Ni,饱和吸附容量接近于相关结果,所以,这意味着实验结果与模型一致。在这部分中,通过测量吸附溶液中Zn离子的浓度来研究吸附过程中的离子交换强度,然后检查离子交换强度的增加,在吸附过程中随着重金属离子浓度的增大而变光滑。当重金属离子HMI的初始浓度固定值为300 mg·L时,然后,离子交换强度的顺序是 Pb>Cu>Ni>Cd.

关键词：合成 ZIF-8 去离子水重金属离子吸附过程

Extended Forgery Detection Framework for COVID-19 Medical Data Using Convolutional Neural Network

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

Computers, Materials & Continua 2021年第9期68卷 3773-3787页

作者： sajid Habib Gill Noor Ahmed Sheikh Samina Rajpar Zain ul Abidin N.Z.Jhanjhi Muneer Ahmad Mirza Abdur Razzaq Sultan S.Alshamrani Yasir Malik Fehmi Jaafar Department of Computer Science Shah Abdul Latif UniversityKhairpur66020SindhPakistan National College of Business Administration&Economics Lahore54000Pakistan School of Computer Science and Engineering SCETaylor’s UniversityMalaysia Department of Information Systems Faculty of Computer Science&Information TechnologyUniversiti MalayaMalaysia Department of Information Technology College of Computer and Information TechnologyTaif UniversityTaif21944Saudi Arabia Department of Computer Science College of Engineering&Computing SciencesNew York Institute of TechnologyVancouverCanada The Computer Research Institute of Montreal QuebecCanada

Medical data tampering has become one of the main challenges in the field of secure-aware medical data *** of normal patients’medical data to present them as COVID-19 patients is an illegitimate action that has been carried out in different ways ***,the integrity of these data can be *** detection is a method of detecting an anomaly in manipulated forged *** appropriate number of features are needed to identify an anomaly as either forged or non-forged data in order to find distortion or tampering in the original *** neural networks(CNNs)have contributed a major breakthrough in this type of *** has been much interest from both the clinicians and the AI community in the possibility of widespread usage of artificial neural networks for quick diagnosis using medical data for early COVID-19 patient *** purpose of this paper is to detect forgery in COVID-19 medical data by using CNN in the error level analysis(ELA)by verifying the noise pattern in the *** proposed improved ELA method is evaluated using a type of data splicing forgery and sigmoid and ReLU phenomenon *** proposed method is verified by manipulating COVID-19 data using different types of forgeries and then applying the proposed CNN model to the data to detect the data *** results show that the accuracy of the proposed CNN model on the test COVID-19 data is approximately 92%.

关键词： Data security data privacy medical-data forgery COVID-19 convolutional neural network machine learning deep learning

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

巴基斯坦药师角色转变中的挑战（英文）

药学服务与研究 2016年第1期16卷 19-24页

作者： Saeed Ahmad Khan Mughal Qayum sajid Khan Sadozai Department of Pharmacy Kohat University of Science and Technology

巴基斯坦的药师教育体系经历了不同阶段的进化历程,最初是三年制的学士教育,并于1978年延长至四年。为了与国际标准接轨并提供药师更多的就业机会,2003年该学制被5年制的药学博士教育替代,但是设立博士项目的初衷并没有实现。在现实中... 详细信息

巴基斯坦的药师教育体系经历了不同阶段的进化历程,最初是三年制的学士教育,并于1978年延长至四年。为了与国际标准接轨并提供药师更多的就业机会,2003年该学制被5年制的药学博士教育替代,但是设立博士项目的初衷并没有实现。在现实中药师的角色转变依然面临诸多挑战。由于存在不专业的实践活动,药师没有被医疗护理团队接纳为一个不可或缺的成员。本文将揭示这些挑战,向相关部门提出建议,采取根本性的法律措施,消除药师在角色转变中的障碍,为巴基斯坦的病人提供富有成效的、有价值的服务。

关键词：药剂师巴基斯坦药学实践药学服务

Use of Geospatial Technology for Assessment of Waterlogging &Salinity Conditions in the Nara Canal Command Area in Sindh, Pakistan

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

Journal of Geographic Information System 2015年第4期7卷 438-447页

作者： Kashif Aslam sajid Rashid Rashid Saleem Rana Muhammad Sohail Aslam Institute of Geology University of the Punjab Lahore Pakistan Pakistan Water and Power Development Authority Lahore Pakistan

Agriculture is being main stay of Pakistan economy and it’s very significant to monitor the existing agricultural areas and its changes, due to different aspects like salinity and waterlogging, which reduce the fertility of agricultural lands adversely. Managing salinity so as to minimize its environmental impact is a prerequisite for the long-term sustainability of irrigated agriculture. It is ironic that the irrigated areas are those that are afflicted most by the twin menaces of waterlogging and salinity. Geospatial technology was used to assess the waterlogging and salinity condition in Nara canal command area, during the last two surveys conducted in years 1977-1981 and 2001- 2003 respectively. After analyzing the results in detail, we obtain a clear relationship among salt affected soils, and waterlogged areas reveal that 0.2% to 1.25% of salt affected areas fall under the shallow zone with high water table. The spatial distribution of water table shows various trends among the water tables, and the surface salinity of surface saline areas has been increased due to waterlogging caused by unmanaged spatial drainage system.

关键词： Geospatial Salinity Waterlogging Nara Canal and Sindh in Pakistan