检索结果-南通市图书馆

Elliptic systems involving multiple critical nonlinearities and symmetric multi-polar potentials

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2014年第5期57卷 1011-1024页

作者： KANG DongSheng yang fen School of Mathematics and Statistics South-Central University For Nationalities

In this paper,a system of elliptic equations is investigated,which involves multiple critical Sobolev exponents and symmetric multi-polar *** variational methods and analytic techniques,the relevant best constants are... 详细信息

关键词： elliptic equation Hardy potential solution critical exponent variational method

Pade Expansion and Nucleon-Nucleon Scattering in Coupled Channels

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2009年第7期52卷 115-118页

作者： LIU Dan yang Ji-fen Department of Physics East China Normal University Shanghai 200062 China

We extend our Pade-aided analysis of the nonperturbative renormalization of nucleon-nucleon scatteringto the case of coupled channels.

关键词： nucleon-nucleon scattering nonperturbative renormalization effective field theories

Neural cell co-culture induced differentiation of bone marrow mesenchymal stem cells into neuronal-like cells

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2008年第6期3卷 581-584页

作者： Nailong yang Lili Xu fen yang Department of VIP Healthcare the Affiliated Hospital of Medical College Qingdao University Qingdao 266003 Shandong Province China Department of Endocrinology the Affiliated Hospital of Medical College Qingdao University Qingdao 266003 Shandong Province China

BACKGROUND： It has been previously demonstrated that the neural cell microenvironment has the ability to induce differentiation of bone marrow mesenchymal stem cells （BMSCs） into the neural cells. OBJECTIVE： To establish a co-culture system of human BMSCs and neural cells, and to observe effects of this co-culture system on differentiation of human BMSCs into neural cells. DESIGN, TIME AND SETTING： A comparative observation experiment, performed at the Center Labora-tory of the Affiliated Hospital of Medical College Qingdao University from October 2006 to December 2007. MATERIALS： Neural cells were obtained from human fetal brain tissue. BMSCs were harvested from fe-male patients that underwent autonomous stem cell transplantation. METHODS： BMSCs in the co-culture group consisted of BMSCs and third passage neural cells. BMSCs in the control group were solely cultured in vitro. MAIN OUTCOME MEASURES： Morphological changes of BMSCs were observed, and expression of the neuronal specific marker, neuron-specific enolase （NSE）, was analyzed by immunofluorescence staining after 4-5-day co-culture. RESULTS： The number of neural cells in the co-culture group increased and the cells spread on the culture bottle surface. Radial dendrite formed and connected with each other. NSE-immunoreactive cells were also detected. The positive ratio of NSE-positive cells reached （32.7±11.5）%, with morphological characteristics similar to neuronal cells. Human BMSCs did not express NSE in the control group. CONCLUSION： The microenvironment provided by neurons induced differentiation of BMSCs into neu-ronal-like cells.

关键词： bone marrow mesenchymal stem cells stem cell transplantation cell differentiation neurons

Photoacoustic viscoelasticity imaging dedicated to mechanical characterization of biological tissues

在线全文

学校读者我要写书评

暂无评论

Journal of Innovative Optical Health Sciences 2017年第4期10卷 29-41页

作者： Yujiao Shi fen yang Qian Wang Ministry of Education Key Laboratory of Laser Life Science College of BiophotonicsSouth China Normal University Guangzhou510631P.R.China Institute of Laser Life Science College of Biophotonics South China Normal UniversityGuangzhou 510631P.R.China

Since changes in mechanical properties of biological tissues are often closely related to pathology,the viscoelastic properties are important physical parameters for medical diagnosis.A photoacoustic(PA)phase-resolved method for noninvasively characterizing the biological tissue viscoelasticity has been proposed by Gao et al.[***,***,***,\Viscoelasticity imaging of biological tissues with phase-resolved photoacoustic measurement,"***.36,3341–3343(2011)].The mathematical relationship between the PA phase delay and the viscosity–elasticity ratio has been theoretically ***,systems of PA viscoelasticity(PAVE)imaging including PAVE microscopy and PAVE endoscopy were developed,and high-PA-phase contrast images re°ecting the tissue viscoelasticity information have been successfully *** PAVE method has been developed in tumor detection,atherosclerosis characterization and related vascular *** reviewed the development of the PAVE technique and its applications in biomedical¯*** is believed that PAVE imaging is of great potential in both biomedical applications and clinical studies.

关键词： Photoacoustic imaging viscoelasticity phase detection atherosclerosis

Vertical distribution of nonylphenol and nonylphenol ethoxylates in sedimentary core from the Beipaiming Channel, North China

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

Journal of Environmental Sciences 2007年第3期19卷 353-357页

作者： JIN fen HU Jian-ying yang Min State Key Lab of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China College of Environmental Science Peking University Beijing 100871 China

The vertical profiles of nonylphenol （NP） and nonylphenol ethoxylates （NPEOs） were investigated in a sediment core from the Beipaiming Channel, North China using high sensitive LC-MS and GC-MS metthods In this core, relatively high concentrations of NP and NPEOs occurred in the surface sediment （≤40 cm）, with the maximum value of NP and NPEOs reaching 3539 and 12735 mg/g, respectively, whereas, no NP or NPEOs were detected in deeper sediments （〉40 cm）. The high concentrations of NP and NPEOs in the surface layers suggested recent inputs in this area. NPEOs with short ethoxy chains （NPnEO, n=0-3） were dominant in the NPEO mixture with percentages from 54% to 78%, which were similar to the distribution of homolog NPEO in effluents from nearby sewage treatment plants （STPs）, indicating that the channel received the effluents from these STPs. The sewage treatment ratio was quite similar to that found in North America before the 1980s. Finally, the concentrations of NP and NPEOs were related to the total organic carbon （TOC）（p〈0.001）, suggesting that TOC was an important factor for vertical distribution of NPEOs and NP from the Beipaiming Channel.

关键词： nonylphenol nonylphenol ethoxylates sediment core Bohai Bay

An Overview of Self-Assembly and Morphological Regulation of Amphiphilic DNA Organic Hybrids

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2015年第5期33卷 511-516页

作者： fen Wu Yiyang Zhang Zhongqiang yang Key Laboratory of Organic Optoelectronics&Molecular Engineering of the Ministry of Education Department of ChemistryTsinghua UniversityBeijing 100084China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Molecular Recognition and FunctionInstitute of ChemistryChinese Academy of Sciences(CAS)Beijing 100190China

In this review,we summarized the assembly behavior of DNA organic hybrids and listed reported strategies of tuning the morphology of *** self-assembly and morphological regulation of DNA organic hybrids provide an effective way to construct functional nanostructures with potential applications in nanomaterials,drug delivery and tissue *** future directions are discussed.

关键词： DNA amphiphiles self-assembly morphology regulation

物理方法干预骨髓间充质干细胞分化最理想的参数

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

中国组织工程研究 2025年第31期29卷 6727-6732页

作者：刘洵欧阳厚淦潘荣斌王姿杨芬田佳玄江西中医药大学江西省南昌市330004

背景:近年来研究发现物理干预手段对骨髓间充质干细胞的增殖、分化和迁移具有显著影响。但目前物理干预尚存在诸如基础研究数据有待加强、统一的参数标准尚需进一步完善等不足。目的:综述物理手段对骨髓间充质干细胞分化的影响。方法:... 详细信息

背景:近年来研究发现物理干预手段对骨髓间充质干细胞的增殖、分化和迁移具有显著影响。但目前物理干预尚存在诸如基础研究数据有待加强、统一的参数标准尚需进一步完善等不足。目的:综述物理手段对骨髓间充质干细胞分化的影响。方法:检索中国知网和PubMed数据库,以“骨髓间充质干细胞,骨髓基质细胞,成骨分化,成软骨分化,电刺激,机械刺激,低氧,脉冲电磁场,低强度脉冲超声”为中文检索词,以“bone marrow mesenchymal stem cells(BMSC),bone marrow stromal cells,osteogenesis differentiation,chondrocytes differentiation,electrical stimulation,mechanical stimulation,hypoxia,electromagnetic fields,low intensity pulsed ultrasound”为英文检索词,选取58篇文献进行综述。结果与结论:①物理手段通过改变特定的微环境调控骨髓间充质干细胞的增殖、分化等,但参数尚未统一,今后应进一步优化并探讨相关物理因素调控骨髓间充质干细胞增殖及分化的最佳参数和作用条件;②某些特殊物理环境条件难以通过低成本的常规手段开展应用,有待后续研究发展进一步降低特殊物理条件的构建难度;③物理手段干预骨髓间充质细胞增殖与分化目前尚未广泛应用于临床,未来需要进一步研究并促进临床转化。

关键词：骨髓间充质干细胞成骨分化成软骨分化物理因素机械转导干细胞组织工程

同方期刊数据库

Design and Properties of Fluoroelastomer Composites via Incorporation of MWCNTs with Varied Modification

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2020年第9期38卷 983-992,I0007页

作者： Guang-Yao yang Li-fen Tong Xiao-Bo Liu Research Branch of Advanced Functional Materials School of Materials and EnergyUniversity of Electronic Science and Technology of ChinaChengdu 610054China

Multi-walled carbon nanotubes(MWCNTs)modified with silane coupling agent A-1120(MWCNTs-A1120)were *** with the raw MWCNTs,acidified MWCNTs(MWCNTs-COOH),and MWCNTs grafted with EDA(MWCNTs-NH2),MWCNTs-A1120 have the best dispersion in fluoroelastomer at the same doping ***,fluoroelastomer/MWCNTs-A1120 composite has the best mechanical properties with tensile strength of 13.92 MPa and elongation at break of 111.78%.Then,the effects of doping amount of MWCNTs-A1120 on the electrical properties of the composites were *** dielectric constant of the composite increases with the increase of MWCNTs-A1120,and the dielectric loss does not change much at the low doping amount such as 0.5 wt%.When the doping amount of MWCNTs-A1120 is 5 wt%,the dielectric constant and the dielectric loss value are greatly increased,and the volume resistivity is greatly decreased,which proves that the conductive network is formed in the composite,so the filling amount of 5 wt%is the percolation *** tensile deformation of the sample also affects the electrical properties of the *** the tensile deformation increases,the dielectric constant and dielectric loss of the composite *** the composite with 5 wt%MWCNTs-A1120,excessive tensile deformation will destroy the conductive network structure of the composite,so the composite will change from conductive material to dielectric ***,such composite is a good candidate for flexible conductive material or flexible dielectric material used in harsh environments such as high temperatures and various aggressive solvents.

关键词： Modified-MWCNTs Fluoroelastomer nanocomposite Interface compatibility Dielectric properties Volume resistivity

Internal energy transfer phenomenon and light-emission properties of γ-LiAlO_2 phosphor doped with Mn^(2+)

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2013年第7期20卷 678-683页

作者： Bai-Bin Wang Chi-fen Chang Wein-Duo yang Department of Chemical and Materials Engineering Kaohsiung University of Applied Sciences Electronics Testing Center

γ-LiAlO2 phosphor was synthesized using the cellulose-citric acid sol-gel method, and its light emission and energy transfer properties were investigated. Excitation and emission spectrum analysis revealed a decrease in intensity of the spectrum as the amount of Mn2＋ doping increased. Blasse＇s equation determined the maximum distance for energy transfer between Mn2＋ ions as 4.3142 nm. Dexter＇s theory verifies that the mechanism of energy transfer between Mn2＋ ions conforms to an electric dipole and electric quadrupole interaction.

关键词： phosphor energy transfer light emission sol-gel process doping