检索结果-南通市图书馆

Combined Electric and Heat System Testbeds for Power Flow Analysis and Economic Dispatch

在线全文

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2021年第1期7卷 34-44页

作者： Xin Qin Xinwei Shen ye guo Zhaoguang Pan Qinglai guo Hongbin Sun the Tsinghua-Berkeley Shen zhen Institute Tsinghua UniversityShenzhen 518055China the department of electric engineering Tsinghua UniversityBeijing 100084China

In combined electric and heat systems,selecting a suitable testbed for power flow analysis or economic dispatch is not easy:a large number of existing testbeds are not opensource,while others are difficult to be reused by other researchers due to the particularity of system scale,topology,and *** this paper,we present three open-source testbeds with different scales based on practical combined electric and heat *** satisfy researchers"specific demands on the system topology and data,we also discuss how to modify testbeds based on existing topologies and *** can use the testbeds presented in this paper to test their innovative methods for power flow analysis and economic dispatch,and can also design their own testbeds based on the methodology in this paper,using published topologies and data.

关键词： Combined heat and power system economic dispatch power flow testbed

首发重度抑郁症脑功能变化:基于静息态fMRI的低频振幅和局部一致性分析

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

放射学实践 2024年第2期39卷 164-168页

作者：叶郭锡徐凡熊玉超陈松叶泳松曾旭文广州市红十字会医院/广州市应急医院/暨南大学附属广州红十字会医院/广州市红十字会医院互联网医院广东广州510220 广东省中医院影像科广东广州510120

目的:基于静息态fMRI探讨首发重度抑郁症患者(MDD)发作期间各脑区低频振幅(ALFF)和局部一致性(ReHo)的特点,进一步明确抑郁发病的脑神经机制。方法:纳入2022年1月-2022年10月在本院根据《精神障碍诊断和统计手册》第四版(DSM-IV)确诊的... 详细信息

目的:基于静息态fMRI探讨首发重度抑郁症患者(MDD)发作期间各脑区低频振幅(ALFF)和局部一致性(ReHo)的特点,进一步明确抑郁发病的脑神经机制。方法:纳入2022年1月-2022年10月在本院根据《精神障碍诊断和统计手册》第四版(DSM-IV)确诊的首发MDD患者40例和健康志愿者(对照组)50例,使用3.0T磁共振仪对每例受试者行静息态fMRI及高分辨率T 1WI检查,采用双样本t检验比较两组间临床资料及各脑区ALFF及ReHo测量值的差异。结果:两组间年龄和受教育程度的差异无统计学意义(P>0.05)。与对照组相比,首发MDD组左侧颞下回、双侧丘脑、双侧额中回及左侧辅助运动区的ALFF值增高,而双侧中央后回、左侧颞中回、左枕中回、左侧后扣带回及左侧楔前叶的ALFF值降低(AlphaSim校正,体素水平P<0.05,簇水平P<0.05);双侧颞下回、左脑岛和双侧额中回的ReHo值增高,左颞中回、双侧中央后回、左枕中回和右侧楔前叶的ReHo值降低(AlphaSim校正,体素水平P<0.05,簇水平P<0.05)。ALFF及ReHo值均升高的脑区主要位于左颞下回、双额中回,均降低的脑区位于左颞中回、双侧中央后回和左枕中回。结论:首发MDD患者的感觉运动网络、视听觉网络、默认网络和执行控制网络的脑活动存在广泛异常改变,从而为更好地了解MDD的发生发展提供初步线索。

关键词：首发抑郁症脑功能功能磁共振成像低频振幅局部一致性

在线全文

学校读者我要写书评

暂无评论

额肯呼都格地震台地震观测波形干扰分析

地震地磁观测与研究 2024年第3期45卷 94-99页

作者：包文超赵铁锁郭雷郭晔王西内蒙古自治区地震局呼和浩特010010 锡林浩特地震监测中心站内蒙古自治区026000

计算额肯呼都格地震台测震和强震连续观测数据背景噪声,对地震观测数据PDF进行分析,发现强震观测数据存在异常干扰。对受干扰数据进行噪声功率谱(Power Spectral Density,PSD)、噪声功率谱概率密度(Probability Density Function,PDF)分... 详细信息

计算额肯呼都格地震台测震和强震连续观测数据背景噪声,对地震观测数据PDF进行分析,发现强震观测数据存在异常干扰。对受干扰数据进行噪声功率谱(Power Spectral Density,PSD)、噪声功率谱概率密度(Probability Density Function,PDF)分析,缩小干扰源范围,并进行现场排查,判定强震观测数据异常由电源干扰所致。将市电断开后,观测数据恢复正常。清理数据采集器和强震计接地线,并更换线缆,重新供电后观测数据噪声明显降低,再次计算数据PDF并进行傅里叶变换,结果均无异常。

关键词：地震波形干扰电源干扰傅里叶变换 PDF

Jittor: a novel deep learning framework with meta-operators and unified graph execution

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2020年第12期63卷 118-138页

作者： Shi-Min HU Dun LIANG guo-ye YANG guo-Wei YANG Wen-Yang ZHOU Department of Computer Science and Technology Tsinghua University Beijing National Research Center for Information Science and Technology

This paper introduces Jittor, a fully just-in-time(JIT) compiled deep learning framework. With JIT compilation, we can achieve higher performance while making systems highly customizable. Jittor provides classes of Numpy-like operators, which we call meta-operators. A deep learning model built upon these meta-operators is compiled into high-performance CPU or GPU code in real-time. To manage metaoperators, Jittor uses a highly optimized way of executing computation graphs, which we call unified graph execution. This approach is as easy to use as dynamic graph execution yet has the efficiency of static graph execution. It also provides other improvements, including operator fusion, cross iteration fusion, and unified memory.

关键词： deep learning framework meta-operator unified graph execution JIT compilation generative adversarial network

尿素调控纳米多孔合金NiFeCoMgCN的电催化性能

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

材料热处理学报 2024年第4期45卷 13-19页

作者：闾宏卫叶志国彭新元李多生南昌航空大学材料科学与工程学院江西南昌330063

制备高效、稳定的析氧反应(OER)电催化剂是工业制氢的关键所在。使用尿素作为造孔剂和活性C/N源,基于纳米级柯肯达尔效应,通过高温烧结制备了纳米多孔合金NiFeCoMgCN,并分析了其作为电极的电催化性能。结果表明:在1 M KOH溶液中,NiFeCoM... 详细信息

制备高效、稳定的析氧反应(OER)电催化剂是工业制氢的关键所在。使用尿素作为造孔剂和活性C/N源,基于纳米级柯肯达尔效应,通过高温烧结制备了纳米多孔合金NiFeCoMgCN,并分析了其作为电极的电催化性能。结果表明:在1 M KOH溶液中,NiFeCoMgCN电极在10 mA·cm^(-2)下的过电位为199 mV,Tafel斜率为41.7 mV·dec^(-1),优于IrO_(2)/Ni foam电极(10 mA·cm^(-2)下的过电位为215 mV,Tafel斜率为76.3 mV·dec^(-1)),并且在1 A·cm^(-2)的大电流密度下能够持续工作至少100 h。NiFeCoMgCN电极优异的催化活性归功于其连续的纳米多孔结构和本质活性的提高。

关键词：纳米多孔合金NiFeCoMgCN OER 本质活性稳定性尿素

A Linearized Branch Flow Model Considering Line Shunts for Radial Distribution Systems and Its Application in Volt/VAr Control

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2023年第4期11卷 1191-1200页

作者： Hanyang Lin Firdous Ul Nazir Bikash C.Pal ye guo Tsinghua-Berkeley Shenzhen Institute Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518071China Department of Electrical and Electronic Engineering Glasgow Caledonian UniversityGlasgow Caledonian UniversityGlasgowG4 OBAU.K. Department of Electrical and Electronic Engineering Imperial College LondonLondonSW72AZU.K.

When urban distribution systems are gradually modernized,the overhead lines are replaced by underground cables,whose shunt admittances can not be *** power flow(PF)model withπequivalent circuit shows non-convexity and long computing time,and most recently proposed linear PF models assume zero shunt *** of them are not suitable for fast calculation and optimization problems of modern distribution systems with non-negligible line ***,this paper proposes a linearized branch flow model considering line shunt(LBFS).The strength of LBFS lies in maintaining the linear structure and the convex nature after appropriately modeling theπequivalent circuit for network equipment like *** results show that the calculation accuracy in nodal voltage and branch current magnitudes is improved by considering shunt *** show the application scope of LBFS by controlling the network voltages through a two-stage stochastic Volt/VAr control(VVC)problem with the uncertain active power output from renewable energy sources(RESs).Since LBFS results in a linear VVC program,the global solution is *** study exhibits that VVC framework can optimally dispatch the discrete control devices,*** transformers and shunt capacitors,and also optimize the decision rules for real-time reactive power control of ***,the computing efficiency is significantly improved compared with that of traditional VVC methods.

关键词： Line shunt linear power flow model stochastic optimization Volt/VAr control(VVC)

Synthesis and application of an IL-supported diol as protecting group for aldehydes

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2007年第10期18卷 1205-1208页

作者： Yue Qin Cai ye Liu guo Hua Gao Shanghai Key Laboratory of Green Chemistry and Chemical Processes East China Normal University Shanghai 200062 China

A new IL-supported diol, 1-（2,3-dihydroxypropyl）-3-methylimidazolium hexafluorophosphate has been synthesized and characterized by Fr-IR, ^1H NMR, ^13C NMR and MS （ESI）. Its physical properties such as freezing point, solubility and specific gravity and thermal stability were determined. Synthetic utilities of the resultant diol as a protecting group for aldehydes were also investigated.

关键词： IL-supported diol Preparation Characterization Protecting group

The Numerical Study of the S = 1/2 XXZ Chain

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2001年第10期36卷 483-486页

作者： ye Fei DING guo-Hui XU Bo-Wei Department of Physics Shanghai Jiao Tong University Shanghai 200030 China Department of Physics Shanghai Jiao Tong University Shanghai 200030 China Department of Physics Shanghai Jiao Tong University Shanghai 200030 China

We adopt the Lanczos method combined with the quantum conformal field theory to investigate the S = 1/2XXZ chain in detail. The bulk-limit ground state energy, the anomalous scaling dimension of the spin operators, theFermi velocity and the zero-temperature susceptibility are numerically calculated. The results agree to the exact solution well.

关键词： quantized spin models, strongly correlated electron systems, Lanczos method

Stapled SC34EK fusion inhibitors with high potency against HIV-1and improved protease resistance

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

Chinese Chemical Letters 2018年第7期29卷 1167-1170页

作者： ye guo Lili Fu Xiaowen Fan Xuanling Shi School of Pharmacy Baotou Medical College Comprehensive AIDS Research Center School of Medicine Tsinghua University

HIV fusion inhibitors are promising therapeutic agents for AIDS treatment. One fusion inhibitor has been approved as anti-HIV drug, while more of them are in preclinical studies or clinical trials. Highly active fusion inhibitors with excellent pharmacokinetic properties are still needed for development of anti-HIV drugs. We found that all-hydrocarbon staples inserted in SC34 EK could not only enhance the inhibitory activity of inhibitors against HIV-1, but also improve protease resistance. Further study revealed that SC34 EK-1 containing a staple was a potent fusion inhibitor with IC;value of 0.04-6.4 nmol/L towards diverse HIV-1 subtypes and half-life value of 112 min against protease hydrolysis. X-ray crystallography studies indicated that introduction of a hydrocarbon staple in SC34 EK could make the amino acid at the interaction surface form perfect conformation to promote inhibitor peptide interacting with target.

关键词： Fusion inhibitor HIV-1 Stapled peptide SC34EK