检索结果-南通市图书馆

Meson Effects on the Chiral Condensate at Finite Density

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2002年第8期38卷 181-184页

作者： HUANG Mei ZHUANG peng-fei ZHAO wei-Qin Physics Department Tsinghua University Beijing 100084 China CCAST (World Laboratory) P.O. Box 8730 Beijing 100080 China Physics Department Tsinghua University Beijing 100084 China CCAST (World Laboratory) P.O. Box 8730 Beijing 100080 China Institute of High Energy Physics the Chinese Academy of Sciences Beijing 100039 China

Meson corrections on the chiral condensate up to next-to-leading order in a 1/Nc expansion at finite densityare investigated in the NJL model with explicit chiral symmetry breaking. Compared with mean-field results, the chiralphase transition is still of the first order while the properties near the critical density for chiral phase transition are foundto change significantly.

关键词： meson corrections, chiral condensate

Local quantum Fisher information and quantum correlation in the mixed-spin Heisenberg XXZ chain

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

Frontiers of physics 2024年第2期19卷 235-245页

作者： peng-fei wei Qi Luo Huang-Qiu-Chen Wang Shao-Jie Xiong Bo Liu Zhe Sun School of Physics Hangzhou Normal UniversityHangzhou 310036China Zhejiang Institute of Modern Physics and School of Physics Zhejiang UniversityHangzhou 310027China School of Information and Electrical Engineering Hangzhou City UniversityHangzhou 310015China Zhejiang Provincial Key Laboratory of Urban Wetlands and Regional Change Hangzhou 311121China

We study the local quantum Fisher information(LQFI)in the mixed-spin Heisenberg XXZ *** the maximal and minimal LQFI are studied and the former is essential to determine the accuracy of the quantum parameter estimation,the latter can be well used to characterize the discord-type quantum *** investigate the effects of the temperature and the anisotropy parameter on the maximal LQFI and thus on the accuracy of the parameter *** we make use of the minimal LQFI to study the discord-type correlations of different site *** dimensions of the subsystems cause different values of the minimal LQFI which reflects the asymmetry of the discord-type *** addition,the site pairs at different positions of the spin chains have different minimal LQFI,which reveals the influence of the surrounding spins on the bipartite quantum *** results show that the LQFI obtained through a simple calculation process provides a convenient way to investigate the discord-type correlation in high-dimensional systems.

关键词： local quantum Fisher information quantum correlation mixed-spin Heisenberg XXZ chain

Deep gold mineralization features of Jiaojia metallogenic belt,Jiaodong gold Province:Based on the breakthrough of 3000 m exploration drilling

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

China Geology 2020年第3期3卷 385-401页

作者： Xue-feng Yu Da-peng Li Jing-xiang Tian De-ping Yang wei Shan Ke Geng Yu-xin Xiong Nai-jie Chi peng-fei wei peng-rui Liu Shandong Institute of Geological Sciences Jinan 250013China Key Laboratory of Gold Mineralization Processes and Resources Utilization Ministry of Natural ResourcesJinan 250013China Key Laboratory of Geological Mineralization Processes of Metals and Resource Utilization in Shandong Province Jinan 250013China China University of Geosciences Beijing 100083China

Recently,continuous breakthroughs have been made about deep gold prospecting in the Jiaodong gold province area of *** 5000 t of cumulative gold resources have been explored in Jiaodong,which has thus become an internationally noteworthy gold ore *** gold exploration depth has been increased to about 2000 m from the previous<1000 *** further explore the mineralization potential of the Jiaodong area at a depth of about 3000 m,the Shandong Institute of Geological Sciences has drilled an exploratory drillhole named“Deep drillhole ZK01”to a depth of 3266 ***,as reported herein,the mineralization characteristics of the Jiaojia metallogenic belt have been successfully ***01 is,to date,the deepest borehole with an gold intersect in China,and constitutes a significant advance in deep gold prospecting in *** findings of this study further indicate that the depth interval of 2000 m to 4000 m below the ground surface in the Wuyi Village area incorporates 912 t of inferred gold resources,while the depth interval of 2000 m to 4000 m below the surface across the Jiaodong area possesses about 4000 t of inferred gold *** Jiaojia Fault Belt tends to gently dip downward,having dip angles of about 25°and about 20°at vertical depths of 2000 m and 2850 m,*** deep part of the Jiaojia metallogenic belt differs from the shallow and moderately deep parts about fracturing,alteration,mineralization,and tectonic *** deep zones can generally be categorized from inside outward as cataclastic granite,granitic cataclasite,weakly beresitized granitic cataclasite,beresitized cataclasite,and *** zones exhibit a gradual transitional relation or occur alternately and *** mineralization degree of the pyritized cataclastic granite-type ore in the deep part of the Jiaojia metallogenic belt is closely related to the degree of pyrite vein development;that is,the higher the pyrite content,the wider the veins and the h

关键词： Au deposit Alteration rock type Fracture zone 3000 m scientific drilling Deep mineral exploration engineering Jiaojia metallogenic belt Shandong Province China

Vitamin D receptor genetic polymorphisms and tuberculosis among Chinese Han ethnic group

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2012年第5期125卷 920-925页

作者： CAO Shang LUO peng-fei LI wei TANG Wan-qin CONG Xiao-na wei Ping-min Department of Epidemiology and Health statistics School ofPublic Health Southeast University Nanjing Jiangsu 210009China

Background In epidemiological studies, tuberculosis （TB） appears intimately with vitamin D insufficiency whereas its relationship with vitamin D receptor （VDR） polymorphism caused by radical difference remains unspecified. This study aimed to investigate the relationship between vitamin D genetic polymorphism and tuberculosis in Han ethnic group.

关键词： vitamin D receptor tuberculosis polymorphism susceptibility meta-analysis

INVESTIGATION ON THE COMPUTATIONAL PROPERTIES OF INTRANEURONAL DYNAMICS

在线全文

学校读者我要写书评

暂无评论

Journal of Electronics(China) 1992年第4期9卷 305-311页

作者：沙飞甘强韦钰彭鄂 Laboratory of Molecular and Biomolecular Electronics Southeast UniversityNanjing 210018

This paper aims at exploring computational properties of dynamic processes in neu-ral systems,studying their mathematical formulation,and applying the results to artificial neuralnetwork *** stimulus-response processes in neurons are first introduced briefly,thenproperties of neurons described by the Hodgkin-Huxley equations are *** studyinghow to simplify,the Hodgkin-Huxley equations while maintaining its properties,the concept of dy-namic neuron model is *** is pointed out that the neuron model should include internalstates in order to obtain time-variant thresholds,such as refractory periods of *** discuss problems related to neural network models based on pulse-stream communication andthe contribution of intraneuronal dynamics to collective properties of the neural network.

关键词： Neural networks Neuron model Intraneuronal dynamics Computational property

Modulative effect of transcranial direct current stimulation on the phase synchronization in motor imagery

在线全文

学校读者我要写书评

暂无评论

Modulative effect of transcranial direct current stimulation...

Stenting of iliac vein obstruction following catheter-directed thrombolysis in lower extremity deep vein thrombosis

中国神经科学学会第十届全国学术会议

作者： wei HE peng-fei wei Yi ZHOU Li-Ping WANG Shenzhen Key Lab of Neuropsychiatric Modulation Shenzhen Institutes of Advanced TechnologyChinese Academy of Sciences

Objective Transcranial direct current stimulation（tDCS） is a kind of noninvasive brain stimulation method supplying weak direct current to the head,which could selectively activate or inhibit specific cortical *** tDCS is capable of enhancing the cortex excitability and modulating the event-related desynchronization（ERD） during motor *** ERD is a common characteristic during motor imagery（MI） representing as specific frequency band EEG signal amplitude *** this study,we investigated whether the tDCS could modulate the phase synchronization during MI,which is another significant EEG pattern in MI contrast with *** Ten healthy subjects in two groups performed left and right hand MI tasks in two successive *** or sham stimulation was administrated to the right side of the primary motor cortex（Ml） in the different *** current intensity was 1mA and the stimulation time was 15 *** The pre and post-stimulation normahzed phase locking value（PLV）between the right side of MI and supplementary motor area（SMA） during the left hand MI task were *** results showed that the normahzed PLV of the entire subjects in anodal stimulation group increased after the *** The phase synchronization during MI can be modulated by the anodal tDCS.

关键词： EEG-BCI tDCS motor imagery

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chinese Medical Journal 2013年第18期126卷 3519-3522页

作者： MENG Qing-YOU LI Xiao-qiang JIANG Kun QIAN Ai-min SANG Hong-fei RONG Jian-jie DUAN peng-fei ZHU Li-wei Department of Vascular Surgery Second Affiliated Hospital of Soochow University Suzhou Jiangsu 215004 China

Background Catheter-directed thrombolysis （CDT） for deep venous thrombosis （DV-F） of the lower extremity has good effect, but whether iliac vein stent placement after thrombolytic therapy is still controversial. The goal of this study was to evaluate the efficacy of stent placement in the iliac vein following CDT in lower extremity DVT. Methods This was a single-canter, prospective, randomized controlled clinical trial. After receiving CDT, the major branch of the distal iliac vein was completely patent in 155 patients with lower extremity DVT, and 74 of these patients with iliac vein residual stenosis of 〉50% were randomly divided into a control group （n=29） and a test group （n=45）. In the test group, stents were implanted in the iliac vein, whereas no stents were implanted in the control group. We evaluated the clinical indicators, including patency of the deep vein, C in CEAP classification, Venous Clinical Severity Score （VCSS）, and Chronic Venous Insufficiency Questionnaire （CIVIQ） Score. Results All patients had postoperative follow-up visits for a period of 6-24 months. Venography or color ultrasound was conducted in subjects. There was a significant difference between the patency rate at the last follow-up visit （87.5% vs. 29.6%） and the 1-year patency rate （86.0% vs. 54.8%） between the test and control groups. The change in the C in CEAP classification pre- and post-procedure was significantly different between the test and control groups （1.61±0.21 vs. 0.69±0.23）. In addition, at the last follow-up visit, VCSS and CIVIQ Score were both significantly different between the test and control groups （7.57±0.27 vs. 0.69±0.23; 22.67±3.01 vs. 39.34±6.66, respectively）. Conclusion The stenting of iliac vein obstruction following CDT in lower extremity DVT may increase the patency of the deep vein, and thus provides better efficacy and quality of life.

关键词： deep venous thrombosis catheter-directed thrombolysis stent

Identification the activities of specific cell-type of neurons using multi-channel extracellular recording combining optogenetic probes

在线全文

学校读者我要写书评

暂无评论

Identification the activities of specific cell-type of neuro...

Controlling neuronal activity using light

中国神经科学学会第十届全国学术会议

作者： peng-fei wei Nan LIU Yong-Qiang TANG Li-Ping WANG Shenzhen Key Lab of Neuropsychiatric Modulation Shenzhen Institutes of Advanced TechnologyChinese Academy of Sciences

Objective In vivo multi-channel extracellular recording provides the neuroscientists a new insight into the functional mode of a large group of neurons at the neuronal circuitry ***,different types of neurons in a local circuit can be recorded simultaneously and a rough way to distinguish these cell types is based on the waveform differences of the action *** we introduced optogenetic tools to target the specific type of the neurons（such as the pyramidal cells in neocortex） and recorded the population responses following the optical stimulation in order to identify the targeted neurons’ *** We expressed channelrhodopsin-2（ChR2） under the control of special promoter to target a specific type of neurons（such as using CaMKIIα promoter to label the excitatory pyramidal cells）,and then we implanted an optrode system into the virus transfection *** stimulation evoked many multiunit activities and we well isolated some single *** set up 3 necessary conditions to pick out a ChR2-positive cell:（1） firing probability following the light pulses ＞ 90%;（2） response latency ＜ 3 ms;（3） the waveform correlation between spontaneous and light-evoked spike ＞ *** We recorded and identified 15neurons as the ChR2- positive cell in 3 mice and all of them showed classic pyramidal cell firing *** We identified the specific type of neurons through multi-channel extracellular recording results,confirming it will be an useful tool to distinguish the functions of different type of neurons in a specific behavior in the future study.

关键词： optogenetics multi-channel recording spike waveform identification

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Controlling neuronal activity using light