检索结果-南通市图书馆

Controlling structural topology of metal-organic frameworks with a desymmetric 4-connected ligand through the design of metal-containing nodes

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2016年第4期27卷 502-506页

作者： Bin Wang Hui Yang Ya-Bo Xie Yi-Bo Dou Min-jian zhao jian-Rong Li Beijing Key Laboratory for Green Catalysis and Separation Department of Chemistry and Chemical Engineering College of Environmental and Energy Engineering Beijing University of Technology

Two new metal-organic frameworks（MOFs）,[Cu2（H_2O）_2（BCPIA）]（BUT-20）and（Me_2NH_2）[In（BCPIA）]（BUT-21）were designed and synthesized through the solvothermal reaction between a newly created desymmetric 4-connected ligand,5-（2,6-bis（4-carboxyphenyl）pyridin-4-yl）isophthalic acid（H_4BCPIA）and Cu（NO_3）2 2.5H_2O or In（NO_3）_3·5H_2O,respectively,and characterized by single-crystal and powder Xray diffraction,thermogravimetric analysis,infrared spectroscopy,and elemental *** two MOFs have three-dimensional structures,in which both the BCPIA 4 ligand and metal-containing entities,Cu_2（COO）_4（H_2O）_2 and In（COO）_4 act as 4-connected ***,different linkage configurations of the two metal-containing nodes,quadrilateral Cu_2_TD_2（COO）_4（H_2O）_2and tetrahedral In（COO）_4,lead to distinct structural networks of BUT-20 and 21,with Nbo and Unc topologies,respectively.

关键词： Metal-organic frameworks(MOFs) Design and synthesis Crystal structure Tuned topological network

海马-杏仁核脑深部电刺激术治疗难治性内侧颞叶癫痫长期疗效及其对认知功能的影响

在线全文

学校读者我要写书评

暂无评论

中国现代神经疾病杂志 2024年第7期24卷 540-546页

作者：苏乐王健赵虎林凌至培王湘庆崔志强华北理工大学临床医学院研究生院唐山063000 解放军总医院第一医学中心神经外科医学部北京100853 解放军总医院海南医院神经外科三亚572013 解放军总医院第一医学中心神经内科医学部北京100853

目的探讨海马-杏仁核脑深部电刺激术(AH-DBS)治疗难治性内侧颞叶癫痫的长期疗效及其对认知功能的影响。方法共纳入2014年1月至2018年12月解放军总医院第一医学中心收治的7例难治性内侧颞叶癫痫患者,均行AH-DBS,对比手术前后癫痫发作... 详细信息

目的探讨海马-杏仁核脑深部电刺激术(AH-DBS)治疗难治性内侧颞叶癫痫的长期疗效及其对认知功能的影响。方法共纳入2014年1月至2018年12月解放军总医院第一医学中心收治的7例难治性内侧颞叶癫痫患者,均行AH-DBS,对比手术前后癫痫发作形式、发作频率和抗癫痫发作药物应用情况,采用韦氏成人智力量表修订版(WAIS-R)评估认知功能;术后记录刺激参数以及手术相关并发症。结果共7例患者行双侧AH-DBS 4例,左侧AH-DBS 2例,左侧AH-DBS联合右侧颞前叶切除术1例;经枕部入路6例,经额部入路1例;仅1例患者术后出现头皮切口愈合不良,经局部植皮后痊愈。术后平均随访(73.00±8.98)个月,随访期间复杂部分性发作频率[1.00(0.00,31.00)次/月对2.00(1.50,60.00)次/月;Z=-2.207,P=0.027]、继发性全面性强直-阵挛发作频率[0.00(0.00,1.00)次/月对2.00(1.00,3.00)次/月;Z=-2.428,P=0.015]和总发作频率[1.00(0.50,31.00)次/月对5.00(2.50,64.00)次/月;Z=-2.366,P=0.018]均较术前减少,而手术前后抗癫痫发作药物种类[1.00(1.00,2.00)种对1.00(1.00,3.00)种;Z=-1.633,P=0.102]和WAIS-R评分[(85.50±7.09)分对(89.00±9.47)分;t=-1.761,P=0.078]差异无统计学意义。结论 AH-DBS作为一种新型抗癫痫治疗方法,可以减少难治性内侧颞叶癫痫发作频率,无严重不良事件,且对认知功能无明显影响。

关键词：癫痫颞叶深部脑刺激法海马杏仁核认知

Neural decoding based on probabilistic neural network

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2010年第4期11卷 298-306页

作者： Yi YU Shao-min ZHANG huai-jian ZHANG Xiao-chun LIU Qiao-sheng ZHANG Xiao-xiang ZHENG jian-hua DAI Qiushi Academy for Advanced Studies Zhejiang University Hangzhou 310027 China College of Biomedical Engineering and Instrument Science Zhejiang University Hangzhou 31002 7 China Key Laboratory of Biomedical Engineering of Ministry of Education Zhejiang University Hangzhou 310027 China College of Computer Science and Technology Zhejiang University Hangzhou 310027 China

Brain-machine interface (BMI) has been developed due to its possibility to cure severe body paralysis. This technology has been used to realize the direct control of prosthetic devices,such as robot arms,computer cursors,and paralyzed muscles. A variety of neural decoding algorithms have been designed to explore relationships between neural activities and movements of the limbs. In this paper,two novel neural decoding methods based on probabilistic neural network (PNN) in rats were introduced,the PNN decoder and the modified PNN (MPNN) decoder. In the ex-periment,rats were trained to obtain water by pressing a lever over a pressure threshold. Microelectrode array was implanted in the motor cortex to record neural activity,and pressure was recorded by a pressure sensor synchronously. After training,the pressure values were estimated from the neural signals by PNN and MPNN decoders. Their per-formances were evaluated by a correlation coefficient (CC) and a mean square error (MSE). The results show that the MPNN decoder,with a CC of 0.8657 and an MSE of 0.2563,outperformed the traditionally-used Wiener filter (WF) and Kalman filter (KF) decoders. It was also observed that the discretization level did not affect the MPNN performance,indicating that the MPNN decoder can handle different tasks in BMI system,including the detection of movement states and estimation of continuous kinematic parameters.

关键词： Brain-machine interfaces (BMI) Neural decoding Probabilistic neural network (PNN) Microelectrode array

Summed volume region selection based three-dimensional automatic target recognition for airborne LIDAR

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2020年第3期16卷 535-542页

作者： Qi-shu Qian Yi-hua Hu Nan-xiang zhao Min-le Li Fu-cai Shao State Key Laboratory of Pulsed Power Laser Technology National University of Defense TechnologyHefei230037China Anhui Province Key Laboratory of Electronic Restriction National University of Defense TechnologyHefei230037China The Military Representative Bureau of the Ministry of Equipment Development of the Central Military Commission in Beijing Beijing100191China

Airborne LIDAR can flexibly obtain point cloud data with three-dimensional structural information,which can improve its effectiveness of automatic target recognition in the complex *** with 2D information,3D information performs better in separating objects and ***,an aircraft platform can have a negative influence on LIDAR obtained data because of various flight attitudes,flight heights and atmospheric disturbances.A structure of global feature based 3D automatic target recognition method for airborne LIDAR is proposed,which is composed of offline phase and online *** performance of four global feature descriptors is *** the summed volume region(SVR) discrepancy in real objects,SVR selection is added into the pre-processing operations to eliminate mismatching clusters compared with the interested *** reliable simulated data are obtained under various sensor’s altitudes,detection distances and atmospheric *** final experiments results show that the added step increases the recognition rate by above 2.4% and decreases the execution time by about 33%.

关键词： 3D automatic target recognition Point cloud LIDAR Airborne Global feature descriptor

Improved Operation Characteristics for Nonvolatile Charge-Trapping Memory Capacitors with High-κ Dielectrics and SiGe Epitaxial Substrates

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2017年第9期34卷 95-99页

作者： zhao-zhao Hou Gui-Lei Wang Jin-Juan Xiang Jia-Xin Yao Zhen-hua Wu Qing-Zhu Zhang hua-Xiang Yin Key Laboratory of Microelectronics Devices&Integrated Technology Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029 University of Chinese Academy of Sciences Beijing 100049

A novel high-κ~ A1203/HfO2/AI203 nanolaminate charge trapping memory capacitor structure based on SiGe substrates with low interface densities is successfully fabricated and investigated. The memory capacitor exhibits excellent program-erasable characteristics. A large memory window of ~4 V, a small leakage current density of ~2 ×10-6 Acre-2 at a gate voltage of 7V, a high charge trapping density of 1.42 × 1013 cm-2 at a working vo]tage of 4-10 V and good retention characteristics are observed. Furthermore, the programming （△ VFB = 2.8 V at 10 V for 10μs） and erasing speeds （△VFB =-1.7 V at -10 V for 10μs） of the fabricated capacitor based on SiGe substrates are significantly improved as compared with counterparts reported earlier. It is concluded that the high-κ Al2O3/HfO2/Al2O3 nanolaminate charge trapping capacitor structure based on SiGe substrates is a promising candidate for future nano-scaled nonvolatile flash memory applications.

关键词： Dielectrics and SiGe Epitaxial Substrates Improved Operation Characteristics for Nonvolatile Charge-Trapping Memory Capacitors with High

Enhancement of Electroluminescence by Low-Temperature Deposition of Organic Thin Solid Films

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1997年第2期14卷 141-144页

作者： GU jian-hua XU Min-hua XIAO Zhong-dang LU Zu-hong huaNG Song-yu National Laboratory of Molecular and Bioelectronics Southeast UniversityNanjing 210096 Department of Physics East China University of Science and Technologx Shanghai 200237

The electrical and light-emitting behaviors of electroluminescent cells,which consist of naphthoylimide(NPL)as emitting layer and poly(3-octylthiophene)(P3OT)doped with poly(N-vinylcarbazoe)(PVK)as hole transport layer sandwiched between indium-tin-oxide(ITO)and aluminum electrode,have been *** mixed polymer(P3OT:PVK)layer and the emitting layer were deposited by spin coating and by vacuum deposition *** was found that the visible blue emission could be observed from the cells at low bias *** when the ITO substrate was cooled to near the liquid N_(2) temperature during the deposition of NPL emitting layer,the brightness of the cell *** was confirmed that holes could be easily injected into NPL layer with deposition temperature decreased.

关键词： layer Solid sandwich

Antiviral stereoisomers of 3,5-bis(2-hydroxybut-3-en-1-yl)-1,2,4-thiadiazole from the roots of Isatis indigotica

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 2016年第5期27卷 643-648页

作者： Ming-hua Chen Sheng Lin Ya-Nan Wang Cheng-Gen Zhu Yu-huan Li jian-Dong jiang jian-Gong Shi State Key Laboratory of Bioactive Substance and Function of Natural Medicines Institute of Materia Medica Chinese Academy of Medical Sciences and Peking Union Medical College Institute of Medicinal Biotechnology Chinese Academy of Medical Sciences and Peking Union Medical College

Four stereoisomers of 3,5-bis（2-hydroxybut-3-en-1-yl）-l,2,4-thiadiazole, named insatindigothiadia- zoles A-D （1a-1d）, were isolated from the roots oflsatis indigotica. Their structures were determined by spectroscopic analysis; specifically, the absolute configurations were assigned by using the MPA determination rule based on △δrs values of MPA esters, and supported by electronic CD （ECD） calculations. Proposed biosynthetic pathways and preliminary investigations of the biological activities of la-1d against influenza virus A （H3N2）, Coxsackie virus B3, and/or HSV-1 are also discussed.

关键词： Isatis indigoticaCruciferae3.5-Bis( 2-hydroxybut-3-en- 1 -yl)-1 2 4-thiadiazole Stereoisomer Insatindigothiadiazoles A-DAntiviral activity

Four new eremophilendiolides from Ligularia atroviolacea

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2007年第1期18卷 59-61页

作者： Shu Yun Shi Di Yao Wu Xun Gong hua Peng Rong Ping Zhang Chang Xin Zhou Xiao jiang Hao Zhong jian Jia Joachim Stockigt Yu zhao Department of Traditional Chinese Medicine and Natural Drug Research College of Pharmaceutical Sciences Zhejiang University Hangzhou 310031 China College of Pharmacy Kunming College of Medicine Kunming China Kunming Institute of Botany Chinese Academy of Sciences Kunming 650204 China Lehrstuhl fiir Pharmazeutische Biologie lnstitut fur Pharmazie Johannes-Gutenberg Universitiit Mainz D-55099 Mainz Germany

From Ligularia atroviolacea, four new eremophilendiolides, 81$-hydroxy-eremophil-3,7 （11）-dien-12,8α（14,6α）-diolide （1）, 8β-methoxy-eremophil-3,7（11）-dien-12,8α（14,6α）-diolide （2）, 8α-hydroxy-eremophil-3,7（11）-dien-12,8lβ（14,6α）-diolide （3） and eremophil-3,7（11）,8-trien-12,8 （14,6α）-diolide （4）, as well as a known diolide （5） were isolated. Their structures were elucidated on the basis of 1D and 2D NMR as well as ESI-MS spectral data.

关键词： Phytochemical examination Sesquiterpene Eremophilendiolide Ligularia atroviolacea

Positive effects of PVP in MIC:Preparation and characterization of Al-Core heterojunction fibers

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2023年第1期19卷 52-62页

作者： Fuwei Li Yue-ting Wang Cheng-ai Wang Yun Shen Ze-hua Zhang jian Cheng Shuang-zhang Wu Ying-hua Ye Rui-qi Shen School of Chemistry and Chemical Engineering Nanjing University of Science&TechnologyNanjing210094China Micro-Nano Energetic Devices Key Laboratory Ministry of Industry and Information TechnologyNanjingJiangsu210094China College of Field Engineering Army Engineering University of PLANanjing210007China

The core-shell metastable intermolecular composites(MIC)have attracted much attention in the past few years due to their unique ***,the preparation of Al-Core heterojunction fibers using PVP as a template is *** nano-Al was directly added to the precursor solution of cupric acetate monohydrate(CAM)/Polyvinylpyrrolidone(PVP),and the initial Al@CAM/PVP fibers were obtained via *** core-shell MIC fibers are then obtained by calcining the initial *** morphology,structure,and composition of Al-core MIC fibers were characterized,that the energetic fibers calcined at 300℃,350℃,and 400℃have a core-shell structure with shell compositions CuxO and PVP,CuxO and Cu O,*** energy release characteristics of Al-core MIC were investigated,and preliminary ignition tests were performed using an ignition temperature measuring instrument and a pulsed *** energetic fibers calcined at 300℃exhibited unique *** decomposition of PVP in the shell layer promoted exotherm,and a low-temperature exothermic peak was shown at 372-458℃.Lower ignition temperatures and higher flame heights were observed in the combustion tests than calcination at 350℃and 400℃.An unexpected result was that PVP can play a positive role in Al/CuO ***,this preparation method provided an idea for the integrated preparation of core-shell Al-Core MIC fibers and tuning the properties of MIC.

关键词： Al-Core heterojunction structure Metastable intermolecular composites(MIC) Al/CuO nanothermites Polyvinylpyrrolidone(PVP)