检索结果-南通市图书馆

A 400 MHz Low Noise Amplifier at Cryogenic Temperature for Superconductor Filter System

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 Electronic Science and Technology of China 2007年第3期5卷 230-233页

作者： guo-bin wang Xiao-Ping Zhang Bi-Song Cao wifla Department of Physics Tslnghua University Beijing 100084 China

A cryogenic low noise amplifier （LNA） using Agilent high electron mobility transistor （HEMT） for 380 MHzto 480 MHz is designed and fabricated, and the excellent cryogenic performance in superconducting receiver front-end for communication system is achieved. A special input impedance matching topology is implemented to provide low noise figure （NF） and good input matching in this cryogenic LNA design. The measurement results show that the NF is within 0.25 dB from the minimum NF of a single transistor, the power gain is above 20 dB, the flatness is within 1 dB, and the maximum input return loss is lower than -20 dB in bandwidth.

关键词： Cryogenic low noise amplifier HTS fiter magnetic core inductor with high Q value superconductor receiver front-end.

在线全文

学校读者我要写书评

暂无评论

适用于半波长线路的贝瑞隆差动改进算法

电力系统自动化 2017年第6期41卷 80-85页

作者：李斌郭子煊姚斌王兴国智能电网教育部重点实验室(天津大学) 天津市300072 中国电力科学研究院北京市100192

介绍了一种适用于半波长线路的贝瑞隆差动改进算法。该算法使用线路1/6,1/2和5/6这3个点作为贝瑞隆差动保护的参考点,分别计算3个参考点的贝瑞隆差流幅值,然后累加3个差流幅值除以2,可以近似得到故障点的实际短路电流。该算法解决了传... 详细信息

介绍了一种适用于半波长线路的贝瑞隆差动改进算法。该算法使用线路1/6,1/2和5/6这3个点作为贝瑞隆差动保护的参考点,分别计算3个参考点的贝瑞隆差流幅值,然后累加3个差流幅值除以2,可以近似得到故障点的实际短路电流。该算法解决了传统贝瑞隆差动保护应用于半波长线路时计算值受参考点影响的问题。EMTP仿真表明,该方法可以很好地计算出故障点的故障电流,适用于半波长输电线路。

关键词：半波长交流输电继电保护贝瑞隆模型电流差动保护

含BN旋转轴的光驱动分子马达的理论设计和机理研究

在线全文

学校读者我要写书评

暂无评论

化学学报 2018年第3期76卷 196-201页

作者：郭妮王斌刘峰毅陕西师范大学化学化工学院陕西省大分子科学重点实验室西安710119

依据B=N键与C=C键的电子结构相似性,以Feringa型二苯乙烯型光驱动分子马达(CC-stilbene)为母体,设计了含极性旋转轴的模型马达***2//CASSCF计算结果表明,优化所得的BN-stilbene分子的基态存在四个与CC-stilbene马达结构相似、相对能量... 详细信息

依据B=N键与C=C键的电子结构相似性,以Feringa型二苯乙烯型光驱动分子马达(CC-stilbene)为母体,设计了含极性旋转轴的模型马达***2//CASSCF计算结果表明,优化所得的BN-stilbene分子的基态存在四个与CC-stilbene马达结构相似、相对能量一致的螺旋异构体;B=N极性共价双键对BN-stilbene的基态和激发态电子结构有显著影响.对BN-stilbene模型马达的工作机理研究表明,极性旋转轴的引入使得BN-stilbene中S_1/S_0-CI与激发态中间体构型更加相似且能量更低,同时可增加旋转的驱动力,起到改进分子马达光异构化过程的单向性的目的.

关键词：光异构化分子马达圆锥交叉无辐射跃迁极性旋转轴

Clinicopathological Characteristics and Prognosis of Hepatoid Adenocarcinoma of the Stomach:Evaluation of a Pooled Case Series

在线全文

学校读者我要写书评

暂无评论

Current Medical Science 2018年第6期38卷 1054-1061页

作者： Xiang-yu ZENG Yu-ping YIN Hua XIAO Peng ZHANG Jun HE Wei-zhen LIU Jin-bo GAO Xiao-ming SHUAI guo-bin wang Xiu-li WU Kai-xiong TAO Department of Gastrointestinal Surgery Tongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China Department of Gastroduodenal and Pancreatic Surgery Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine Central South UniversityChangsha 410013China Department of Pathology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China

Hepatoid adenocarcinoma of the stomach (HAS)is an extremely rare and unique gastric *** present study aimed to examine the relevance of the clinicopathological characteristics of HAS with patient *** retrospectively reviewed clinical data of 34 HAS patients treated at our institution between January 2010 and December 2016,as well as 294 cases reported prior to 2017 in research *** these patients,45.6%(115/252)had lesions in the gastric antrum and 77.0%(235/305)were *** levels of serum alpha-fetoprotein (AFP)were detected in most patients(75/93,80.6%).Vascular invasion(199/286,69.6%),lymph node metastasis (222/283,78.4%),and preoperative distant metastasis (121/328,36.9%)were commonly *** 5-year disease-free survival (DFS)and disease-specific survival (DSS) were 20.7%and 29.2%,*** and DSS of patients receiving neoadjuvant therapy were significantly higher than those of patients receiving postoperative adjuvant therapy [DFS:P<0.001, hazard ratio (HR)=-1.831,95%confidence interval (CI):0.060-0.429;DSS:P<0.001,HR=-2.185, 95%CI:0.032-0.401].In conclusion,HAS exhibits distinct clinicopathological characteristics and a strikingly worse prognosis when compared with common gastric *** surgery,early pTNM stage,and adjuvant therapy may predict a more favorable *** therapy is strongly recommended for patients with lymph node metastasis or/and preoperative distant metastasis.

关键词： hepatoid adenocarcinoma stomach clinicopathological characteristics adjuvant therapy neoadjuvant therapy prognosis

Anomaly Detection of Controllable Electric Vehicles through Node Equation against Aggregation Attack

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2025年第1期82卷 427-442页

作者： Jing guo Ziying wang Yajuan guo Haitao Jiang State Grid Jiangsu Electric Power Co. Ltd.Research InstituteState Grid Corporation of ChinaNanjing211100China

The rapid proliferation of electric vehicle(EV)charging infrastructure introduces critical cybersecurity vulnerabilities to power grids *** study presents an innovative anomaly detection framework for EV charging stations,addressing the unique challenges posed by third-party aggregation *** approach integrates node equations-based on the parameter identification with a novel deep learning model,xDeepCIN,to detect abnormal data reporting indicative of aggregation *** employ a graph-theoretic approach to model EV charging networks and utilize Markov Chain Monte Carlo techniques for accurate parameter *** xDeepCIN model,incorporating a Compressed Interaction Network,has the ability to capture complex feature interactions in sparse,high-dimensional charging *** results on both proprietary and public datasets demonstrate significant improvements in anomaly detection performance,with F1-scores increasing by up to 32.3%for specific anomaly types compared to traditional methods,such as wide&deep and DeepFM(Factorization-Machine).Our framework exhibits robust scalability,effectively handling networks ranging from 8 to 85 charging ***,we achieve real-time monitoring capabilities,with parameter identification completing within seconds for networks up to 1000 *** research contributes to enhancing the security and reliability of renewable energy systems against evolving cyber threats,offering a comprehensive solution for safeguarding the rapidly expanding EV charging infrastructure.

关键词： Anomaly detection electric vehicle aggregation attack deep cross-network

Evaluation on Groundwater Resources of Medium Salinity in Tarim Basin and Development and Demonstration of Under-mulch-drip Irrigation Technology for Cotton

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 Groundwater Science and Engineering 2013年第3期1卷 10-21页

作者： Qiao Li Jin-long Zhou Shun-jun Hu bin-guo wang Rui-liang Jia College of Water Conservancy and Civil Engineering Xinjiang Agricultural UniversityUrumqi 830052China Xinjiang Institute of Ecology and Geography Chinese Academy of SciencesUrumqi 830011China School of Environmental Science China University of GeosciencesWuhan 430074China

The groundwater of medium salinity refers to the groundwater with a mineralization degree of 2-7 g/L that can be directly or indirectly used for irrigation. This paper determined the distribution area of the groundwater with medium salinity in Tarim Basin, estimated the total amount of recharge resources and exploitable quantity of the groundwater of medium salinity. The irrigation water quality assessment was conducted on the groundwater of medium salinity by using multiple factors and methods. The salt tolerance parameters and irrigation water mineralization control parameters of the cotton in under-mulch-drip irrigation were determined. The under-mulch-drip irritation technology for cotton in groundwater of medium salinity was developed and applied successfully to the demonstration area. The social, economic and ecological effects of this technology as well as the application prospect were analysed. This paper also puts forward two questions that need to be further studied.

关键词： Tarim Basin Groundwater of medium salinity Under-mulch-drip irrigation for cotton

汇率调整、资本项目开放与跨境资本流动——新兴市场经验对我国的启示

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中央财经大学学报 2017年第4期 104-116页

作者：唐国强王彬中央财经大学经济学院中国石油规划总院中国人民大学国际货币研究所中国工商银行总行投资银行部研究中心

笔者基于37个新兴市场国家数据,通过构建静态、动态面板模型,实证考察了跨境资本流动的内外部驱动因素。实证结果表明,资本项目开放在短期和长期资本流动中分别起到重要但不同的作用;外部国际货币政策调整、外部流动性条件始终是跨境资... 详细信息

笔者基于37个新兴市场国家数据,通过构建静态、动态面板模型,实证考察了跨境资本流动的内外部驱动因素。实证结果表明,资本项目开放在短期和长期资本流动中分别起到重要但不同的作用;外部国际货币政策调整、外部流动性条件始终是跨境资本流动的显著决定因素;新兴市场国家基本面仅在长期跨境资本流动中表现出显著的影响力;随着新兴市场国家汇率机制总体上趋向弹性,汇率调整在跨境资本流动中的作用并不重要。我国的实证结果与新兴市场的相关结论总体上是一致的,但也有部分差异,主要原因是我国在汇率与资本项目开放上的自身特点使得相关结论表现出一定的"中国特色"。从新兴市场跨境资本流动驱动因素的历史经验与实证结果来看,我国在汇率与资本项目制定安排上,未来应当构建更具弹性的人民币汇率形成机制,引导人民币汇率有序调整,对短期跨境资本项目开放更加审慎,由此形成保持国内货币政策独立性、人民币汇率渐进有序贬值与资本项目开放审慎的政策格局。

关键词：跨境资本流动汇率资本项目开放新兴市场

在线全文

学校读者我要写书评

暂无评论

抑制血管生成与胃癌治疗的研究进展

世界华人消化杂志 2007年第5期15卷 433-439页

作者：汤涛王国斌华中科技大学同济医学院附属协和医院普外科湖北省武汉市430022

血管生成为肿瘤生长提供了营养,促进了肿瘤迅速增长,同时也使肿瘤细胞进入血液循环,促进了转移.抑制血管生成能显著抑制肿瘤的生长及转移,在胃癌的各种治疗实验已初步显示良好的应用前景,有望成为胃癌治疗的新方法.

关键词：胃癌新生血管综合治疗肿瘤细胞血液循环

碳化硅负载Cu-Mn-CeO_x催化剂的制备及其微波场中诱导甲苯氧化分解

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

现代化工 2018年第3期38卷 133-137页

作者：胡旭睿郭斌王欣河北科技大学环境工程学院河北石家庄050000

利用溶胶-凝胶法制备的碳化硅基Cu-Mn-CeO_x复合催化剂处理甲苯,并在微波场中分析其性能。结果表明,碳化硅具有良好的吸波性能,负载后的催化剂活性组分紧紧附着在碳化硅载体的表面。针对不同的进气浓度和流量,催化剂在微波场下显示出比... 详细信息

利用溶胶-凝胶法制备的碳化硅基Cu-Mn-CeO_x复合催化剂处理甲苯,并在微波场中分析其性能。结果表明,碳化硅具有良好的吸波性能,负载后的催化剂活性组分紧紧附着在碳化硅载体的表面。针对不同的进气浓度和流量,催化剂在微波场下显示出比常规加热方法更高的催化性能,在280℃就能去除90%以上的甲苯。由催化剂的微观分析表征可以看出,催化剂活性组分以铜锰尖晶石以及立方晶相的二氧化铈为主;催化剂活性单元及有机气体分子在微波场中高频震动,强化了其氧化过程,并减少了催化剂堵塞失活现象,可以大大延长催化剂的使用寿命。

关键词：催化氧化微波加热碳化硅甲苯抗积碳