检索结果-南通市图书馆

Meningeal Lymphatic Vessels:A Drain of the Brain Involved in Neurodegeneration?

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

Neuroscience Bulletin 2020年第5期36卷 557-560页

作者： yuan Cheng Yan-jiang Wang Department of Neurology and Center for Clinical Neuroscience Daping HospitalThird Military Medical UniversityChongqing 400042China Chongqing Key Laboratory of Aging and Brain Diseases Chongqing 400042.China The Institute of Brain and Intelligence Third Military Medical UniversityChongqing 400042China

Neurodegenerative diseases include several kinds of neurological disorder that are caused by the progressive death of neurons in different regions of the *** diseases affect millions of people worldwide and impose a heavy health burden on modern ***,their pathogenesis remains elusive,and disease-modifying methods are not currently available to prevent,halt,or reverse them[1].

关键词： degeneration diseases death

在线全文

学校读者我要写书评

暂无评论

高温高压对三元预混燃料爆炸特性的影响

高压物理学报 2025年第1期39卷 64-78页

作者：朱源姜根柱王筱蓉郭宏展苏傲成江苏科技大学机械工程学院江苏镇江212003

乙醇/甲烷/氢气(C_(2)H_(5)OH/CH_(4)/H_(2))作为一种新型的替代燃料,研究其爆炸特性对于我国新能源的可持续发展具有重要意义。在不同的当量比(0.8~1.4)、初始压力(0.1、0.2和0.4 MPa)和初始温度(370、400和450 K)下,从实验和化学动力... 详细信息

乙醇/甲烷/氢气(C_(2)H_(5)OH/CH_(4)/H_(2))作为一种新型的替代燃料,研究其爆炸特性对于我国新能源的可持续发展具有重要意义。在不同的当量比(0.8~1.4)、初始压力(0.1、0.2和0.4 MPa)和初始温度(370、400和450 K)下,从实验和化学动力学角度分析了其对关键爆炸特性参数,如峰值爆炸压力、峰值爆炸压力上升速率、爆炸时间以及爆燃指数的影响。结果表明,爆炸特性参数在当量比为1.2~1.3之间时出现极值。峰值爆炸压力与初始压力呈线性正相关,而与初始温度呈线性负相关。增大初始压力,火焰锋面裂纹、胞化程度加深,峰值爆炸压力增大。此外,实验工况下评估的最大爆燃指数为20.83 MPa·m/s,表明预混燃料的燃烧处于相对安全水平。基元反应敏感性分析表明:爆燃反应与H和OH自由基密切相关,而R1、R8、R24、R96是影响爆炸反应强度最重要的4个基元反应。研究成果可为C_(2)H_(5)OH/CH_(4)/H_(2)三元混合燃料在实际燃烧装置中的应用、燃料安全性评估以及爆炸事故预防提供参考。

关键词：乙醇/甲烷/氢气爆炸特性线性相关 H和OH自由基

维普期刊数据库博看期刊

同方期刊数据库

High-temperature oxidation behavior of HVOF-sprayed rare earth-modified WC-12Co coating

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2022年第11期41卷 3895-3902页

作者： Zong-Qiu hang Nai-yuan Xi Yan Liu Yue Liu Hui Chen School of Materials Science and Engineering Southwest Jiaotong UniversityChengdu610031China

In this study,the CeO_(2)-modified WC-12 Co coatings were deposited on Q345 steel substrate using high-velocity oxygen fuel(HVOF) *** behavior of the modified coatings was analyzed in the range of 450-900℃ for different oxidation time to investigate the effects of oxidation time and temperature on the *** oxidation kinetics and oxidation mechanism of the modified coatings were *** results show that the oxides are mainly composed of WO_(3) and CoWO_(4) within 450-750℃ while the phases are different at 900 ℃.The CeO_(2)-modified coatings have good oxidation resistance when the oxidation temperature is below550℃ and the oxidation mechanism changes due to the occurrence of anomalous oxidation above 650℃.Moreover,the oxidation mass gain curves obey approximately a parabolic law in the temperature range of 450-650℃ at the initial stage but the later oxidation proceeds by a linear *** addition,based on the analysis of micromorphology and component of the prepared coating,the role of rare earth(RE) additives is obtained during high-temperature oxidization.

关键词： Rare earth HVOF WC-Co coating Oxidation behavior

Specification of functional neurons and glia from human pluripotent stem cells

在线全文

学校读者我要写书评

暂无评论

Protein & Cell 2012年第11期3卷 818-825页

作者： yuan jiang Mei-jiang Zhang Bao-Yang Hu State Key Laboratory of Reproductive Biology Key laboratory of Translational Stem Cell ResearchInstitute of ZoologyChinese Academy of SciencesBeijing 100101China

Human pluripotent stem cells(PSCs)such as embryonic stem cells(ESCs)and induced pluripotent stem cells(iPSCs)hold great promise in regenerative medicine as they are an important source of functional cells for potential cell *** human PSCs,similar to their counterparts of mouse,have the full potential to give rise to any type of cells in the ***,for the promise to be fulfilled,it is necessary to convert these PSCs into functional specialized *** the developmental principles of neural lineage specification,human ESCs and iPSCs have been effectively differentiated to regional and functional specific neurons and glia,such as striatal gama-aminobutyric acid(GABA)-ergic neurons,spinal motor neurons and myelin sheath forming *** human PSCs,in general differentiate after the similar developmental program as that of the mouse:they use the same set of cell signaling to tune the cell fate and they share a conserved transcriptional program that directs the cell fate ***,the human PSCs,unlike their counterparts of mouse,tend to respond divergently to the same set of extracellular signals at certain stages of differentiation,which will be a critical consideration to translate the animal model based studies to clinical application.

关键词： pluripotent stem cells embryonic stem cells induced pluripotent stem cells neural stem cell regenerative medicine cell transplantation

3D printing of flexible piezoelectric composite with integrated sensing and actuation applications

在线全文

学校读者我要写书评

暂无评论

Advanced Powder Materials

Advanced Powder Materials 2024年第5期3卷 91-100页

作者： jiang Li Yan Zhang Mingyang Yan Chao Zhong Lianzhong Zhao Di Zhai hang Luo Xi yuan Dou Zhang State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China

3D printing of flexible piezoelectric composites(3D-FPCs)is increasingly attracting the attention due to its unique advantage for customized smart ***,current research mainly focuses on the 0-3 piezoelectric composites,in which the piezoelectric ceramics are embedded in polymer matrix in the form of *** poor connectivity between particles much reduces the conduction of strain and charge in the composites,seriously limiting its application in *** this work,a continuous lead zirconate titanate(PZT)double-layer ceramic scaffold was prepared by 3D printing and assembled with epoxy resin and interdigital electrodes together to manufacture a multifunctional *** 3D-FPCs exhibit a free strain of 1830 ppm in actuating and are able to actuate a stainless-steel cantilever beam to produce a tip displacement of 5.71 ***,the devices exhibit a sensitivity of 26.81V/g in sensing ***,3D-FPCs are demonstrated as actuators for mobile small robots and wearable sensors for sensing joint activities.

关键词： 3D printing Direct ink writing Flexible piezoelectric composites Actuation Sensing

Ultrahigh energy density in dielectric nanocomposites by modulating nanofiller orientation and polymer crystallization behavior

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

Advanced Powder Materials

Advanced Powder Materials 2024年第5期3卷 1-10页

作者： Ru Guo hang Luo Di Zhai Zhida Xiao Haoran Xie yuan Liu Fan Wang Xun jiang Dou Zhang Powder Metallurgy Research Institute State Key Laboratory of Powder MetallurgyCentral South UniversityChangsha410083China

High-energy density dielectrics for electrostatic capacitors are in urgent demand for advanced electronics and electrical power ***(vinylidene fluoride)(PVDF)based nanocomposites have attracted remarkable attention by intrinsic high polarization,flexibility,low density,and outstanding ***,it is still challenging to achieve significant improvement in energy density due to the common contradictions between electric polarization and breakdown ***,we proposed a novel facile strategy that simultaneously achieves the construction of in-plane oriented BaTiO3 nanowires and crystallization modulation of PVDF matrix via an in-situ uniaxial stretch *** polar phase transition and enhanced Young's modulus facilitate the synergetic improvement of electric polarization and voltage endurance capability for PVDF ***,the aligned distribution of nanowires could reduce the contact probability of nanowire tips,thus alleviating electric field concentration and hindering the conductive ***,a record high energy density of 38.3 J/cm3 and 40.9 J/cm3 are achieved for single layer and optimized sandwich-structured nanocomposite,*** work provides a unique structural design and universal method for dielectric nanocomposites with ultrahigh energy density,which presents a promising prospect of practical application for modern energy storage systems.

关键词： Dielectrics Energy storage Poly(vinylidene fluoride) BaTiO3 nanowire Crystallization behavior

Hierarchical Bimetallic Selenides CoSe_(2)–MoSe_(2)/rGO for Sodium/Potassium-Ion Batteries Anode: Insights into the Intercalation and Conversion Mechanism

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

Energy & Environmental Materials 2022年第2期5卷 627-636页

作者： Yanan Xu Xiaofeng Liu hang Su Shan jiang Jianmin Zhang Dan Li College of Chemistry Zhengzhou UniversityZhengzhou 450001China Green Catalysis CenterCollege of ChemistryZhengzhou UniversityZhengzhou 450001China

As anode materials for high-performance sodium-ion batteries and potassium-ion batteries,bimetallic selenides have attracted great concern due to their relatively high electrical conductivity and electrochemical ***,the formidable challenge in the reaction process is the large volume change,leading to the structural collapse of material,and eventually the decline in electrochemical ***,a composite of hierarchical CoSe_(2)–MoSe_(2) tubes anchored on reduced graphene oxide nanosheets(CoSe_(2)–MoSe_(2)/rGO)is designed by an in situ hydrothermal selenization *** from the synergistic effects between CoSe_(2) and MoSe_(2),unique hierarchical structure,and effective reduced graphene oxide coating,the CoSe_(2)–MoSe_(2)/rGO exhibited improved reaction kinetics and structural stability,and thus good electrochemical properties.A combination mechanism of intercalation and conversion of CoSe_(2)–MoSe_(2)/rGO by forming NaxCoSe_(2) and Mo_(15)Se_(19) as intermediate states is put forward on the basis of in situ and ex situ XRD analyses.

关键词： CoSe_(2) hierarchical structure MoSe_(2) potassium-ion batteries sodium-ion batteries

Adaptive beam forming for time-variant channels with a multi-beam antenna

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2008年第3期15卷 37-40页

作者： jiang Ze MEI yuan-yuan RUAN Wei College of Electronic Engineering Chongqing University of Posts and Telecommunications Chongqing 400065 China

A multi-beam adaptive antenna is investigated by considering the adaptive beam forming performance for time-variant channels on the focus of mobile to base station or reverse link. This antenna is constructed by Fresnel zone phase-correcting plane （FZP） focusing element and uniformly spaced feeds array. An estimator for the beamforming weight vector in the presence of angle spreads is derived using a code filtering approach. Owing to the time-varying nature of the channels, a recursive method for computing and tracking the above optimal weight vector solution that is easy to implement is applied. The effects of angle spread, maximum Doppler frequency, and forgetting factor are studied. Simulation results showed that this type of adaptive antenna is capable of performing adaptive beam forming for time-variant channels effectively.

关键词： adaptive antenna adaptive beam forming FZP mismatch loss

Five new records of Xanthidae(Crustacea:Brachyura)from Hainan Island,China

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2022年第1期40卷 296-308页

作者： Ziming yuan Zhongli SHA Wei jiang Laboratory of Marine Organism Taxonomy and Phylogeny Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Biology and Biotechnology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China

Five new records of the family Xanthidae are reported from China:Hypocolpus haanii Rathbun,1909,Neoliomera variolosa(***-Edwards,1873),Leptodius australis Ward,1936,*** Ward,1941,and Xanthias joanneae Mendoza,*** specimens were collected from Hainan Island and deposited in the Marine Biological Museum,Chinese Academy of *** based on observation,photographs,line drawings,and some taxonomic discussions are provided.

关键词： morphology Xanthidae new records South China Sea taxonomy