检索结果-南通市图书馆

黄河宁夏段水沙数值模拟与堤坝冲刷安全分析研究

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

黄河宁夏段水沙数值模拟与堤坝冲刷安全分析研究

作者： Rizwan qadir 天津大学

学位级别：硕士

黄河宁夏平原段河床宽浅,主流摆动频繁。为了稳定河势,平顺主流,在黄河宁夏段建立了以堤防、河道整治工程为主的防洪体系。但由于河岸滩地抗冲能力较低,洪水期间险工近岸处易受到冲刷,威胁边坡稳定。为分析黄河宁夏段洪水期堤坝冲淤安全... 详细信息

黄河宁夏平原段河床宽浅,主流摆动频繁。为了稳定河势,平顺主流,在黄河宁夏段建立了以堤防、河道整治工程为主的防洪体系。但由于河岸滩地抗冲能力较低,洪水期间险工近岸处易受到冲刷,威胁边坡稳定。为分析黄河宁夏段洪水期堤坝冲淤安全,本文建立典型河段水沙数值模型,模拟不同来水来沙条件下的河道流速变化,分析险工坡脚河床冲淤变化规律,探讨险工岸坡冲淤安全问题。本文的研究内容及成果如下:(1)建立青铜峡至石嘴山河段一维水沙数值模型,利用2012年典型洪水实测资料率定模型,保证模型精度,然后分别建立青铜峡—勉家湾、头道墩—六顷地河段二维水沙模型,将一维模型计算结果设置为二维模型边界条件,并对二维模型进行验证,为不同来水来沙条件下的泥沙输移及河床冲淤变化规律研究奠定了基础。(2)为了研究不同来水条件下险工防洪安全问题,建立了青铜峡～石嘴山段一维水沙数学模型,分别模拟了中常洪水条件和20年一遇洪水条件下多沙河道洪水演进情况。结果表明,在中常洪水和20年一遇洪水情况下,青石段洪水最高水位均低于两岸堤顶高程。距青铜峡水文站11.3km、116.0km和153.9km等位置,河道最高水位与堤顶高程十分接近;如果发生稀遇洪水,应特别注意洪水漫溢淹没影响,该区域潜在风险较大,属防汛重点关注位置。(3)为研究不同来水来沙条件下的险工坡脚冲刷规律,建立了多沙河道二维水沙数学模型,模拟了五种计算工况。结果表明,洪水过后险工坡脚河床冲淤基本达到平衡,河床平衡冲深与洪水期间平均含沙量和近岸水流平均流速有关,平均流速相同时,河床冲深随平均含沙量增大而减小;平均含沙量相同时,河床冲深随平均流速增大而增大。

关键词：险工水流冲刷水沙数值模拟防洪安全黄河宁夏段

从巴基斯坦返回阿富汗喀布尔的二代阿富汗难民的跨文化适应研究

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

从巴基斯坦返回阿富汗喀布尔的二代阿富汗难民的跨文化适应研究

作者： Abdul qadir Jalali 河北大学

学位级别：硕士

本研究调查了从巴基斯坦返回阿富汗喀布尔的阿富汗二代难民的跨文化适应过程,聚焦当前阿富汗背景下返回者回到原籍国第一年所面对的文化适应问题。此外,本研究还探讨了媒体在增加和减少青年移民中的所起到的作用。阿富汗移民巴基斯坦有... 详细信息

本研究调查了从巴基斯坦返回阿富汗喀布尔的阿富汗二代难民的跨文化适应过程,聚焦当前阿富汗背景下返回者回到原籍国第一年所面对的文化适应问题。此外,本研究还探讨了媒体在增加和减少青年移民中的所起到的作用。阿富汗移民巴基斯坦有着悠久的历史,本研究以金荣渊（young Yun Kim）的跨文化适应理论为基础,以在巴基斯坦生活18年以上并返回阿富汗喀布尔的移民为对象开展研究,以半结构化访谈收集资料,来自喀布尔市的12名18至35岁的年轻返回者自愿参加了访谈。结果表明,语言障碍、文化知识和环境挑战是返回者所面对的必须克服的困难。此外,研究概括出返回者为适应陌生环境所采取的三种主要策略:增加社会互动、使用大众媒体、对当前问题保持开放的心态。

关键词：遣返阿富汗难民跨文化适应大众媒体移民和第二代移民跨文化交流

Burden of Care as Perceived by Informal Caregivers of the Patients Receiving Chemotherapy in Tertiary Care Hospital of Karachi, Pakistan

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Open Journal of Emergency medicine 2020年第4期8卷 95-109页

作者： Asher Ghori Rubina Barolia Naghma Rizvi Ghulam qadir male School of Nursing Sindh Government Hospital Liaquatabad Karachi Pakistan School of Nursing and midwifery Aga Khan University Karachi Pakistan Sindh Government Hospital Karachi Pakistan

Background: Almost 32.5 million people are diagnosed with cancer annually. The huge number of cancer patients with deteriorating health renders a far greater number of informal caregivers bearing the burden of care in... 详细信息

m>Backgroundm>: Almost 32.5 million people are diagnosed with cancer annually. The huge number of cancer patients with deteriorating health renders a far greater number of informal caregivers bearing the burden of care in different forms and magnitude. The main purpose of the study was to explore the types of burden perceived by the informal caregivers and the factors associated with the caregiving burden. m>methodsm>: A quantitative descriptive cross-sectional study design was adopted to answer the research questions from April to may 2016. Around 200 informal caregivers were recruited from one of the tertiary hospitals of Karachi, Pakistan. The modified ZBIS was used to collect data which was analyzed by using Chi-square test to find the associations between the demographic characteristics of informal caregivers and the perceived burden of care. m>Resultsm>: Findings of the study identified the employment status (P ≤ 0.020) and the religion of the informal caregivers (P ≤ 0.027) as significant, demographic variables. The functional level of care receivers was also found to be significant (P ≤ 0.002). The study also recognized four forms of burdens, with significant mean values, including financial (2.85), psychological (2.50), social (2.58), and physical (2.44). most of the participants reported experiencing a moderate magnitude of burden, ranging from 40 - 60, on the scale of 0 - 80. m>Conclusionm>: The study highlighted four different forms of burdens, that is, financial, psychological, social, and physical, along with their associated demographic factors. Health care agencies and public health personnel should work with informal caregivers to reduce burden of care.

关键词： Burden of Care Informal Caregiver Chemotherapy

Qualification of Atomic Absorption Spectrometer in Prospective View of Pharmaceutical Analysis

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 2014年第10期5卷 674-680页

作者： mahmood Ahmed muhammad Abdul qadir malik Qaiser Hussain Institute of Chemistry University of the Punjab Lahore Pakistan Pharma Services Lahore Pakistan

AAS was qualified as per pharmacopoeia requirements. Copper, manganese, mercury and cadmium hallow cathode lamps were used for qualification purposes. Design qualification and installation qualification met the criteria of user requirements. Wavelength accuracy and reproducibility, resolution and baseline stability are in compliance with user requirements. Characteristics concentration or sensitivity, detection limit and characteristics mass were performed as a part of operational qualification which is 0.062 μg/mL, 0.00354 μg/mL, 1.41 pg respectively. Results of % RSD for precision study is 0.352 and 0.487 for flame and graphite furnace mode respectively fulfilled criteria of qualification. Performance qualification results of 20 consecutive days demonstrate the predetermined specification. Analytical instrument qualification and method validation relationship is also described by assay performed on haemodialysis concentrate. Good precision (2) greater than 0.9997 for potassium, magnesium and calcium linear curves, lower detection limits for all three ingredients and robust assay data as a part of validation studies conform the qualified AAS for its intended application.

关键词： AAS Qualification Pharmaceuticals Validation

用于3-GHz无线通信CmOS多增益低噪声放大器的设计

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

用于3-GHz无线通信CMOS多增益低噪声放大器的设计

作者： muhammad Waqas qadir 中国科学技术大学

学位级别：硕士

随着无线网络传感器应用领域对无线连接的要求不断增长,物联网和射频识别方面都将研究力量集中在提出低成本、低功耗和更小型化的SOC设计方案上。由于CmOS技术在低成本和高集成度方面具有其独特的优势,因此大多数收发机模块在不影响性... 详细信息

随着无线网络传感器应用领域对无线连接的要求不断增长,物联网和射频识别方面都将研究力量集中在提出低成本、低功耗和更小型化的SOC设计方案上。由于CmOS技术在低成本和高集成度方面具有其独特的优势,因此大多数收发机模块在不影响性能的条件下都采用此技术设计。因为LNA是接收机端的第一个模块,整个接收机的灵敏度和噪声都取决于LNA的性能好坏。因此,根据ZigBee、IEEE802.11xx、BLE和RFID等不同应用标准设计LNA将变得更具有挑战性。基于不同的无线应用标准,本论文主要对实现集成多重增益、低噪声、差分结构、高IIP3线性和低功耗的低噪声放大器进行研究,设计了工作于3-3.04GHz的CmOS低噪声放大器。所设计的LNA是基于CmOS GF-130nm工艺的,由输入匹配、多核心放大器、输出匹配和差分结构组成。高频情况下,LNA的灵敏度和功耗通常严格地取决于输入匹配。当它接收的信号从弱输入射频信号变化到更高的时候会消耗更多功率。针对这个问题,本文提出了一种多重共源共栅技术以实现不同的增益模式,且不影响输入输出匹配性能。为了实现较低的低噪声设计,本文提出采用高Q值中心抽头电感来实现低噪声电感源退化以及严格的匹配,将噪声系数小于4 dB。后端仿真结果所示,LNA的最小噪声系数为3.81。对于3-GHz中心频带的多核心放大器模式,本文提出了一种多重共源共栅技术,该技术可以使用不同的栅极偏置控制信号VHigh,VLow,Vmid和VSleep来实现,以使晶体管工作于亚阈值区,使级联的各级增益减少了 3-5dB。后端仿真结果显示,本文设计的LNA共具有4个增益模式,分别为23.2/19.1/15.1/11.1 dB。在频率大于2-GHz时,LNA的输出将会直接耦合至混频器。由于寄生效应,它可能会提供几mHz的相移,并可能导致增益降低、恶化共模噪声和降低IIP3。为解决该问题,基于差分结构、严格的输出匹配以及多抽头电感器的方案被提出。对于严格的输出匹配和差分结构问题,本文在不影响输出匹配的情况下,针对差分和多增益模式匹配,实现基于高Q值中心抽头电感的LC匹配网络。使用0.6V的参考电压来控制输入核心放大器以使其工作于亚阈值区。1.5 V的栅极偏置控制电压在多级共源共栅结构的后续区域工作。考虑到增益和噪声系数之间的权衡,每个模式的功耗约为3.6 mW,工作电流为2-mA。对于不同的模式,IIP3的变化范围为-6.52至-0.96 dBm,LNA模块在整个接收机芯片中所占面积为0.63mm2。在后端仿真中,测试单元的输入匹配采用片外实现。使用Cadence Virtuoso ADE完成PCB设计,输入射频匹配是由片外栅极电感实现的。在仿真中,在理想巴伦中添加了一个等效引线键合电感1-nH,在Cadence Virtuoso ADE仿真中使用了一个具有n端口的栅极电感来获得S参数以获得实时响应。

关键词：低功耗蓝牙片上系统射频模式识别 ZigBee CmOS PCB 电感电容低噪声放大器 Cadence Virtuoso ADE 品质银 3阶交调点

The Effect of Flavonoids on Fiber Development

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

The Effect of Flavonoids on Fiber Development

作者： ANAm qadir KHAN 华中农业大学

学位级别：硕士

In flavonoid metabolic pathway, interplay of Flavonoid-3-hydroxylase（F3H） and Flavonoid-3’-hydroxylase （F3’H） might elucidate total NAR content, because these two genes share the common *** implement the idea,2 DP A ovules of YZ1 were cultured with five different kinds of flavonoids and two flavonoids Naringenin, Dihydrokaempferol significantly retarded fiber growth development as expected. However, a highly significant effect was noticed in ERI treated ovules in comparison with the *** further verify significant effect of ERI on fiber development the effect of ERI was compared with control （no ERI） at three different time point integrations. The results clearly depicted an obvious phenotypic change in fiber length and quality in ERI treated ovules as compared to ***, it can be suggested that ERI is positively associated with fiber development and that the metabolism regulated by F3’H might be important in fiber development. In order to further comprehend the relationship between F3H and F3’Hgenes, cotton F3’H genes were further examined in petal and 5DPA fiber tissues of F3H silence and overexpression lines by using semi quantitative *** results clearly indicated that transcripts of three GrF3’H candidate genes GrF3’H-3, GrF3’H-4 and GrF3’H-8 were up regulated in petals of F3H RNAi lines while in 5DPA fiber the transcription level was not detected. However, these genes were down regulated in petals F3H overexpression *** time PCR was performed and expression pattern of F3’H genes in different YZ1 *** results demonstrated the transcript levels of GhF3’H3 were high in fiber development stages, indicate thatGrF3’H3 could be significantly involved in regulating fiber development in cotton and might have a determining role to play in fiber length and quality parameters. moreover, development of GhF3’HI and GrF3’H8 transgenic lines will further validate results and provide further insights into flavonoid metabolic pat

关键词：

Effect of Bismuth Addition on Structure and mechanical Properties of Tin-9Zinc Soldering Alloy

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

materials Sciences and Applications 2015年第9期6卷 792-798页

作者： muhommad Abdul Wadud m. A. Gafur md. Rakibul qadir mohammad Obaidur Rahman Department of Physics Jahangirnagar University Savar Bangladesh PP&PDC BCSIR Dhaka Bangladesh

关键词： Lead Free Solder Alloy Eutectic Alloy microhardness

汉族急性冠脉综合征患者载脂蛋白E基因多态性与血脂谱的相关性研究

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

汉族急性冠脉综合征患者载脂蛋白E基因多态性与血脂谱的相关性研究

作者： Abdul qadir Nawabi（阿杰）东南大学

学位级别：硕士

背景载脂蛋白E基因（APOE）多态性与血脂谱和心血管疾病有关;然而,这些关系因种族而异。载脂蛋白E有E2、E3、E4这3个亚型,分别由ε2,ε3和ε4这3个等位基因编码。E3是汉族人群中最常见的亚型,E2是最少见的亚型。除载脂蛋白E外,高敏感性C... 详细信息

背景载脂蛋白E基因（APOE）多态性与血脂谱和心血管疾病有关;然而,这些关系因种族而异。载脂蛋白E有E2、E3、E4这3个亚型,分别由ε2,ε3和ε4这3个等位基因编码。E3是汉族人群中最常见的亚型,E2是最少见的亚型。除载脂蛋白E外,高敏感性C-反应蛋白（hs-CRP）和N-端前B型利钠肽（NT-proBNP）近来也作为心血管疾病的新型危险因素。然而载脂蛋白E的基因多态性与这些心血管疾病危险因素之间是否具有关联性,仍尚不清楚。目的本研究首次对汉族人群进行了研究,评估了载脂蛋白E基因多态性的分布及其与急性冠状动脉综合征（ACS）、血脂谱及其他心脏代谢风险因素的关系。同时,我们研究hs-CRP和NT-proBNP与APOE基因型的关系方法本前瞻性研究纳入800名汉族受试者,其中ACS212例,非ACS者588例。对rs7412和rs429358基因型进行了Taqman分析,这两个变异型决定APOE等位基因的ε2,ε3和ε4等位基因。结果ε2、ε3和ε4的频数分别占总体样本的3.8%,76.9%和19.3%。ACS与载脂蛋白E4亚型有关。非急性冠脉综合征组载脂蛋白ε4携带者总胆固醇水平高于ε2携带者（2.414±0.519mmol/L vs 1.618±0.216 mmol/L）,低于ε3纯合子组（2.414±0.519 mmol/L vs2.574±0.507 mmol/L）,差异有显著性（p=0.05）。与ε3纯合子和ε2携带者相比,APOE-ε4携带者的低密度脂蛋白胆固醇水平更高,分别为3.222±0.280 mmol/L,2.574±0.507mmol/L和2.474±0.099 mmol/L（p=0.112）。三个等位基因组总胆固醇/高密度脂蛋白比值差异有显著性（p=0.012）,而低密度脂蛋白/高密度脂蛋白比值在三个等位基因组间差异无显著性（p=0.145）。在急性冠脉综合征组中,我们观察到APOE-ε4携带者组总胆固醇、低密度脂蛋白、高密度脂蛋白、甘油三酯水平更高。此外,APOE-ε4携带者组中总-CHO/HDL-C和LDL-C/HDL-C的比例高于APOE-ε2携带者组。此外,APOE多态性与高血压无关,而hs-CRP和NT-proBNP与ApoE 4呈负相关。Apoe-ε4等位基因与低水平的血浆hs-CRP和NT-proBNP有关。结论我们的研究结果表明,载脂蛋白E基因多态性与中国人的血脂谱及ACS有关。这种与ACS的相关性也可以由ε4携带者中较高的导致粥样动脉硬化谱所证实,这可能需要进一步研究得出确定的结论。在汉族人群中,APOE-ε4等位基因与血浆低水平hs-CRP和NT-proBNP有关,其原因尚待进一步研究来解释。

关键词：载脂蛋白E基因多态性血脂谱急性冠脉综合征

Thermal and Electrical Properties of Sn-Zn-Bi Ternary Soldering Alloys

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

materials Sciences and Applications 2015年第11期6卷 1008-1013页

作者： m. A. Wadud m. A. Gafur m. R. qadir m. O. Rahman Department of Physics Jahangirnagar University Savar Bangladesh PP&PDC BCSIR Dhaka Bangladesh

Sn-Zn based solder is a possible replacement of Pb solder because of its better mechanical properties. The alloys need to be studied and explored to get a usable solder alloy having better properties. In this work, eutectic Sn-9Zn and three Tin-Zinc-Bismuth ternary alloys were prepared and investigated their thermal and electrical properties. Thermo-mechanical Analysis and Differential Thermal Analysis were used to investigate thermal properties. microstructural study is carried out with Scanning Electron microscope. The alloys have single melting point. The co-efficient of thermal expansion and co-efficient of thermal contraction varies with alloy composition and temperature range. Electrical conductivity changes with Bi addition.

关键词： Lead Free Solder Alloy Eutectic Alloy DTA TmA Conductivity