检索结果-南通市图书馆

Phenomenological Studies on Internal Friction of Noncrystalline Materials in Structural Relaxation Processes

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 Physics letters 1998年第4期15卷 281-283页

作者： CAI jian-le QIAO Chu-liang Department of Applied Physics Hunan UniversityChangsha 410082 Department of Physics Yiyang Teachers’CollegeYiyangHunan 413049

Based on not only the ideas of phenomenological investigations about the internal friction of crystalline materials but also the studies on the internal friction laws of noncrystalline materials during structural relaxation processes in recent years,the method of making relaxation cell is put *** the method,traditional mechanics parameter model and two-level model are unified,so phenomenological studies on the internal friction of noncrystalline materials during structural relaxation processes are made and a new relaxation law is formed.

关键词： friction relaxation Internal

leader-follower Optimal Selection Method for Distributed Control System in Active Distribution Networks

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2024年第1期10卷 314-323页

作者： jian le Liangang Zhao Cao Wang Qian Zhou Yang Wang School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China

Aiming at the shortcomings of a traditional centralized control in an active distribution network(AND),this paper proposes a leader-follower distributed group cooperative control strategy to realize multiple operation and control tasks for an *** distributed information exchange protocols of the distributed generation(DG)group devoted to node voltage regulation or exchange power control are developed using a DG power utilization ratio as the consensus *** these bases,this study further investigates the leader optimal selection method for a DG group to improve the response speed of the distributed control ***,a single or multiple leader selection model is established to minimize the constraints of the one-step convergence factor and the number of leaders to improve the response speed of the distributed control *** simulation results of the IEEE 33 bus standard test system show the effectiveness of the proposed distributed control *** addition,the response speed of a DG control group can be improved effectively when the single or multiple leaders are selected optimally.

关键词： Active distribution1network consensus algorithm leader-follower system mixed-integer semidefinite programming optimal distributed control

Stability of Decoherence-Free Subspaces under Stochastic Phase Fluctuations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2006年第3X期46卷 447-452页

作者： ZENG Hao-Sheng NIE jian-Jun KUANG le-Man Department of Physics Hunan Normal University Changsha 410081 China

We study the stability of decoherence-free subspaces under stochastic phase fluctuations by analytically and numerically evaluating the fidelity of the corresponding decoherence-free subspace bases with stochastic phase fluctuations under the evolution of environment. The environment is modeled by a bath of oscillators with infinite degrees of freedom and the register-bath coupling is chosen to be a general dissipation-decoherence form. It is found that the decoherence-free subspaces take on good stability in the case of small dissipation and small phase fluctuations.

关键词： decoherence-free subspaces stochastic phase fluctuations

Implementation of Non-local Operations for High-Dimensional Systems Through Qubit Quantum Channels

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2007年第5X期48卷 851-854页

作者： ZENG Hao-Sheng NIE jian-Jun KUANG le-Man Department of Physics Hunan Normal University Changsha 410081 China

We propose a method to implement a kind of non-local operation between spatially separated two systems with high dimensions by using only a low-dimensional qubit quantum channel and 2-bit classical communication. For qutrit systems, we further show the creation of non-local maximally entangled state and the construction of the non-local quantum XOR gate in terms of the obtained non-local operations as well as some single qutrit local gates.

关键词： nonlocal operation high-dimensional system

A coordinated consistency voltage stability control method of active distribution grid

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 2018年第1期6卷 85-94页

作者： Xi YE jian le Yongyan LIU Wu ZHOU Kaipei LIU College of Electrical Engineering Wuhan University

The presence of distributed generators(DGs)with high penetration poses new challenges in the management and operation of electrical *** to the local character of DGs,they could in principle be used in emergency situations to prevent a voltage instability event of the *** this paper,a certain method is proposed to coordinate the operation of virtual power plant(VPP)and conventional voltage regulation device to improve the static voltage stability of distribution network with the multi-agent *** concept and the general framework of this coordinated control system is introduced,and the voltage instable nodes are determined based on the voltage instability *** voltage coordinated control model of the distribution system is established according to the multi-agent consistency control theory and the coordinated controllers for agents are designed by solving a problem with bilinear matrix inequality *** suggested method is implemented on an IEEE 33 nodes test system and the simulation results show its efficiency and validity.

关键词： Virtual power plant Distributed generation Coordinated consistency control Static voltage stability

Efficacy of hybrid minimally invasive esophagectomy vs open esophagectomy for esophageal cancer: A meta-analysis

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Oncology 2019年第11期11卷 1081-1091页

作者： Jiao Yang Ling Chen Ke Ge jian-le Yang Department of Infectious Diseases Zhejiang Hospital

BACKGROUND The first line treatment regimen for esophageal cancer is still surgical resection and the choice of surgical scheme depends on *** the efficacy comparison of hybrid minimally invasive esophagectomy(HMIE)and open esophagectomy(OE)is still *** To compare the perioperative and postoperative outcomes of HMIE and OE in patients with esophageal *** PubMed,EMBASE,and Cochrane Library databases were searched for related *** odds ratio(OR)or standard mean difference(SMD)with a 95%confidence interval(CI)was used to evaluate the effectiveness of HMIE and *** Seventeen studies including a total of 2397 patients were *** was significantly associated with less blood loss(SMD=-0.43,95%CI:-0.66,-0.20;P=0.0002)and lower incidence of pulmonary complications(OR=0.72,95%CI:0.57,0.90;P=0.004).No significant differences were seen in the lymph node yield(SMD=0.11,95%CI:-0.08,0.30;P=0.26),operation time(SMD=0.24,95%CI:-0.14,0.61;P=0.22),total complications rate(OR=0.68,95%CI:0.46,0.99;P=0.05),cardiac complication rate(OR=0.91,95%CI:0.62,1.34;P=0.64),anastomotic leak rate(OR=0.95,95%CI:0.67,1.35;P=0.78),duration of intensive care unit stay(SMD=-0.01,95%CI:-0.21,0.19;P=0.93),duration of hospital stay(SMD=-0.13,95%CI:-0.28,0.01;P=0.08),and total mortality rates(OR=0.70,95%CI:0.47,1.06;P=0.09)between the two treatment *** Compared with the OE,HMIE shows less blood loss and pulmonary ***,further studies are necessary to evaluate the long-term oncologic outcomes of HMIE.

关键词： Hybrid minimally invasive esophagectomy Open esophagectomy Esophageal cancer

Deformation and failure of a high-steep slope induced by multi-layer coal mining

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 Mountain Science 2020年第12期17卷 2942-2960页

作者： YU jian-le ZHAO jian-jun YAN Hao-yuan LAI Qi-yi HUANG Run-qiu LIU Xiu-wei LI Yang-chun State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China Guizhou Transportation Planning Survey&Design Academy Co. ltd.Guiyang 550081China Guizhou Geological Environment Monitoring Institute Guiyang 550001China

During underground mining,accurate revelation on the deformation and failure mechanisms of a high-steep slope under multi-layer mining conditions facilitates the prevention and control of geological disasters in *** simulation based on discrete element theory can be used to explore the characteristics and mechanism of action of deformation and failure of a slope under complex geological and multi-layer mining *** utilising PFC2 D(particle flow code) software,the deformation and failure characteristics of a high-steep slope in Faer Coal Mine in Guizhou Province,China were ***,the mechanism of influence of different numbers of mining layers on the deformation and failure of the high and steep slope was *** result showed that after the goaf passed by the slope toe,multi-layer mining aggravated the subsidence and deformation of the slope toe:the slope toppled forward as it *** toppling of the slope changed the slope structures:the strata in the front of the slope were transformed from anti-dip to down-dip *** by collapsedtoppled rock mass,the slope toe and the rock mass located in the lower part of the slope toe generally exhibited a locking effect on the ***-layer mining degraded the overall stability of the slope,in that the total displacement of the slope was much greater than the total mining thickness of the coal *** on the aforementioned research,ideas for preventing and controlling geological disasters during mining operations under a high-steep slope were proposed.

关键词： High steep slope Discrete element method Multilayer coal mining Mountain mine geological hazard Subsidence toppling deformation Mining schemes optimization

Two new ortho benzoquinones from Uncaria rhynchophylla

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Natural Medicines 2016年第3期14卷 232-235页

作者： ZHANG Qian CHEN lei HU le-jian LIU Wen-Yuan FENG Feng QU Wei Department of Natural Medicinal Chemistry China Pharmaceutical University Department of Pharmaceutical Analysis China Pharmaceutical University Key Laboratory of Biomedical Functional Materials China Pharmaceutical University

The present study was designed to determine the chemical constituents of the stems and hooks of Uncaria rhynchophylla. The chemical constituents were isolated and purified from CH_2Cl_2 fraction by chromatography. Their structures were elucidated by spectroscopic analyses. Their cytotoxicity was tested using MTT method. Two new ortho benzoquinones, 3-diethylamino-5-methoxy-1, 2-benzoquinone(1) and 3-ethylamino-5-methoxy-1, 2-benzoquinone(2), together with a known compound isorhynchophyllic acid(3) were isolated from U. rhynchophylla. These compounds were evaluated for their cytotoxicity against cancer cells A549, Hep G2 and A2780. Compounds 1 and 2 were new ortho benzoquinones and showed weak antiproliferative activities on A549, Hep G2 and A2780 cells. Compound 3 significantly inhibited the proliferation of A549, Hep G2 and A2780 cells with IC_(50) values being 5.8, 12.8 and 11.8 μmol·L^(–1), respectively.

关键词： Uncaria rhynchophylla Ortho benzoquinones Spectroscopic identification

A serum metabolomic analysis for diagnosis and biomarker discovery of primary biliary cirrhosis and autoimmune hepatitis

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2015年第4期14卷 413-421页

作者： jiang-Shan Lian Wei Liu Shao-Rui Hao De-Ying Chen Yin-Yin Wang jian-le Yang Hong-Yu Jia jian-Rong Huang Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases State Key Laboratory for Diagnosis and Treatment of Infectious Disease First Affiliated Hospital Zhejiang University School of Medicine Yantai City Hospital for Infectious Diseases

Because of the diversity of the dinical and laboratory manifestations, the diagnosis of autoimmune liver disease （AILD） remains a challenge in clinical practice. The value of metabolomics has been studied in the diagnosis of many diseases. The present study aimed to determine whether the metabolic profiles, based on ultraperformance liquid chromatography-mass spectrometry （UPLC-MS）, differed between autoimmune hepatitis （AIH） and primary biliary cir- rhosis （PBC）, to identify specific metabolomic markers, and to establish a model for the diagnosis of AIH and PBC. METHODS： Serum samples were collected from 20 patients with PBC, 19 patients with AIH, and 25 healthy individuals. UPLC-MS data of the samples were analyzed using principal component analysis, partial least squares discrimination analysis and or- thogonal partial least squares discrimination analysis. RESULTS： The partial least squares discrimination analysis model （R2y=0.991, Q2=0.943） was established between the AIH and PBC groups and exhibited both sensitivity and speci- ficity of 100%. Five groups of biomarkers were identified, in- eluding bile acids, free fatty acids, phosphatidylcholines, lyso- lecithins and sphingomyelin. Bile acids significantly increased in the AIH and PBC groups compared with the healthy con- trol group. The other biomarkers decreased in the AIH andPBC groups compared with those in the healthy control group. In addition, the biomarkers were downregulated in the AIH group compared with the PBC group. CONCLUSIONS： The biomarkers identified revealed the pathophysiological changes in AILD and helped to discrimi- nate between AIH and PBC. The predictability of this method suggests its potential application in the diagnosis of AILD.

关键词： autoimmune liver disease biomarkers metabolomics autoimmune hepatitis primary biliary cirrhosis overlap syndrome