检索结果-南通市图书馆

Communications in Theoretical Physics 2008年第12期50卷 1375-1380页

作者： YANG Chun-Nuan HE jin-Chun HUANG Nian-ning Department of Mathematics Huazhong University of Science and Technology Wuhan 430074 China Department of Physics Wuhan University Wuhan 430072 China

Using the integral representation of the Jost solution,we deduce some conditions as the kernel functionN(x,y,t)if the Jost solution satisfies the two Lax *** we verify the multi-soliton solution of NLS equationwith non-vanishing boundary conditions if we prove that these conditions can be demonstrated by the GLM equation,which determines the kernel function N(x,y,t)in according to the inverse scattering method.

关键词： NLS^+ equation inverse scattering method Gel'fand Levitan Marchenko equation

Coordination-driven self-assembly of a molecular 818knot and molecular borromean rings

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第11期67卷 3652-3656页

作者： Xiang Gao Dong Liu Hai-ning Zhang Guo-Xin jin Department of Chemistry Fudan UniversityShanghai 200433China

We report the facile construction of a molecular 8_(18) knot and a molecular Borromean rings assembly through self-assembly directed by Cp^(*)Rh corner units. Two curved ligands of similar size and shape were used in this study. The slight steric differences between the two ligands induce the formation of distinctly different topologies of the assembled products. The structures were confirmed by single-crystal X-ray analysis and nuclear magnetic resonance spectroscopy.

关键词： coordination-driven Cp^(*)Rh 8_(18)knot Borromean rings

Single-legweight limit of fixation model of simple supracondylar fracture of the femur

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2019年第4期35卷 926-939页

作者： Guo-Yu Bai Xiang-Hong Xu jin-Hui Wang ning Sun Tianjin Key Laboratory of Modern Engineering Mechanics Department of Mechanics Tianjin UniversityTianjin 300072 China State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China Beijing Jishuitan Hospital Beijing 100035China

Postoperative early rehabilitation training for supracondylar fracture of femur aids in accelerating the healing of fractures with shorter recovery periods. Presently, clinical studies on post-operative early weight training are still in the nascent stages. The weight bearing capacity at different healing stages typically depends on clinical experience and there is a lack of standards to quantify the weight that would be conducive to the healing of fractures. In this paper, a 3D geometric model of the femur is obtained using imaging data, a locking plate fixation model of a simple supracondylar fracture of the femur, which considers the angle and spatial direction of the fracture surface, is established, the stress distribution and load transmission mechanism of the fracture fixation model on a single leg standing posture are studied and the weight bearing capacity of a standing single leg at the early stage of fracture is given. This provides the basis for objective quantification of postoperative early weight bearing capacity.

关键词： Simple supracondylar fracture of the femur Early weight bearing Single-leg weight limit

Incorporating genomic annotation into single-step genomic prediction with imputed whole-genome sequence data

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 Integrative Agriculture 2022年第4期21卷 1126-1136页

作者： TENG jin-yan ye Shao-pan GAO ning CHEN Zi-tao DIAO Shu-qi LI Xiu-jin YUAN Xiao-long ZHANG Hao LI Jia-qi ZHANG Xi-quan ZHANG Zhe Guangdong Laboratory of Lingnan Modern Agriculture/Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding College of Animal ScienceSouth China Agricultural UniversityGuangzhou 510642P.R.China State Key Laboratory of Biocontrol School of Life SciencesSun Yat-sen UniversityGuangzhou 510006P.R.China Guangdong Provincial Key Laboratory of Waterfowl Healthy Breeding College of Animal Sciences and TechnologyZhongkai University of Agriculture and EngineeringGuangzhou 510225P.R.China

Single-step genomic best linear unbiased prediction(ss GBLUP) is now intensively investigated and widely used in livestock breeding due to its beneficial feature of combining information from both genotyped and ungenotyped individuals in the single model. With the increasing accessibility of whole-genome sequence(WGS) data at the population level, more attention is being paid to the usage of WGS data in ss GBLUP. The predictive ability of ss GBLUP using WGS data might be improved by incorporating biological knowledge from public databases. Thus, we extended ss GBLUP, incorporated genomic annotation information into the model, and evaluated them using a yellow-feathered chicken population as the examples. The chicken population consisted of 1 338 birds with 23 traits, where imputed WGS data including 5 127 612 single nucleotide polymorphisms(SNPs) are available for 895 birds. Considering different combinations of annotation information and models, original ss GBLUP, haplotype-based ss GHBLUP, and four extended ss GBLUP incorporating genomic annotation models were evaluated. Based on the genomic annotation(GRCg6a) of chickens, 3 155 524 and 94 837 SNPs were mapped to genic and exonic regions, respectively. Extended ss GBLUP using genic/exonic SNPs outperformed other models with respect to predictive ability in 15 out of 23 traits, and their advantages ranged from 2.5 to 6.1% compared with original ss GBLUP. In addition, to further enhance the performance of genomic prediction with imputed WGS data, we investigated the genotyping strategies of reference population on ss GBLUP in the chicken population. Comparing two strategies of individual selection for genotyping in the reference population, the strategy of evenly selection by family(SBF) performed slightly better than random selection in most situations. Overall, we extended genomic prediction models that can comprehensively utilize WGS data and genomic annotation information in the framework of ss GBLUP, and valida

关键词： genomic selection prior information sequencing data genotype imputation haplotype

不同策略提高间充质干细胞治疗肝纤维化:效果与潜在风险分析

在线全文

学校读者我要写书评

暂无评论

中国组织工程研究 2025年第23期29卷 5002-5012页

作者：徐岩王雪淞周林周晓磊金煜叶俊松赣南医科大学第一附属医院干细胞临床转化分中心江西省赣州市341000 赣南医科大学康复学院江西省赣州市341000 赣州市干细胞与再生医学重点实验室江西省赣州市341000 组织工程江西省重点实验室江西省赣州市341000 心脑血管疾病防治教育部重点实验室江西省赣州市341000

背景:目前大量研究表明,间充质干细胞联合不同治疗策略能更有效地改善肝纤维化,抑制其向终末期肝病发展。目的:探讨间充质干细胞联合不同策略改善肝纤维化疗效优于单独间充质干细胞治疗的相关机制。方法:由第一作者应用计算机在中国知... 详细信息

背景:目前大量研究表明,间充质干细胞联合不同治疗策略能更有效地改善肝纤维化,抑制其向终末期肝病发展。目的:探讨间充质干细胞联合不同策略改善肝纤维化疗效优于单独间充质干细胞治疗的相关机制。方法:由第一作者应用计算机在中国知网、万方、维普、PubMed、Web of Science和Nature数据库中检索涉及间充质干细胞联合不同策略改善肝纤维化的研究,中文检索词为“间充质干细胞,肝纤维化,联合治疗,肝星状细胞”,英文检索词为“mesenchymal stem/stromal cells,liver/hepatic fibrosis/cirrhosis,combination therapy,hepatic stellate cells/HSCs”,通过快速浏览文章题目及摘要进行筛选,排除与主题关系不密切的文章,最终筛选出104篇文献进行综述分析。结果与结论:间充质干细胞通过分化为肝样细胞、抑制肝星状细胞活化、免疫调节等机制来改善肝纤维化,但间充质干细胞移植后肝脏定植率低、存活率低、作用时间短等原因限制了其临床应用。间充质干细胞联合药物、基因修饰、细胞因子等多种治疗策略改善肝纤维化的疗效优于间充质干细胞单独治疗,并且间充质干细胞联合不同策略通过促进间充质干细胞归巢、抑制肝星状细胞活化、调节微环境、调控信号通路等机制更有效地改善肝纤维化。间充质干细胞还可以通过预处理、miRNA调控及与其他细胞联合,使间充质干细胞在减轻肝纤维化方面表现出更好的肝源性分化、归巢和存活功能。间充质干细胞联合不同策略并不能规避间充质干细胞单独治疗肝纤维化的潜在风险,而且这些策略(药物、基因修饰和细胞因子等)自身安全性也值得考虑。此外,间充质干细胞移植数量和途径等有待进一步研究。

关键词：间充质干细胞肝纤维化肝星状细胞信号通路联合用药基因修饰归巢微RNA

Concurrent Two-Scale Topology Optimization of Thermoelastic Structures Using a M-VCUT Level Set Based Model of Microstructures

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2024年第11期141卷 1327-1345页

作者： jin Zhou Minjie Shao ye Tian Qi Xia State Key Laboratory of Intelligent Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan430074China

By analyzing the results of compliance minimization of thermoelastic structures,we observed that microstructures play an important role in this optimization ***,we propose to use a multiple variable cutting(M-VCUT)level set-based model of microstructures to solve the concurrent two-scale topology optimization of thermoelastic structures.A microstructure is obtained by combining multiple virtual microstructures that are derived respectively from multiple microstructure prototypes,thus giving more diversity of microstructure and more flexibility in design *** effective mechanical properties of microstructures are computed in an off-line phase by using the homogenization method,and then a mapping relationship between the design variables and the effective properties is established,which gives a data-driven model of *** the online phase,the data-driven model is used in the finite element analysis to improve the computational *** compliance minimization problem is considered,and the results of numerical examples prove that the proposed method is effective.

关键词： Two-scale structure topology optimization multiple variable cutting level set data-driven radial basis function thermoelastic structure

Spatial and temporal characteristics of trophic structure of the southern Huanghai Sea fish communities

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

Acta Oceanologica Sinica 2008年第4期27卷 95-111页

作者： XUE Ying jin Xianshi LIANG Zhenlin ye Zhenjiang Key Laboratory of Ministry of Agriculture for Sustainable Utilization of Marine Fisheries Resource Yellow Sea Fisheries Research Institute Chinese Academy of Fishery Sciences Qingdao 266071 China Fisheries College Ocean University of China Qingdao 266003 China

The spatial and temporal characteristics of trophic structure of fish communities in the southern Huanghai Sea were examined based on the data sampled from bottom trawl surveys conducted during the autumn of 2000 and the spring of 2001. Hierarchical agglomerative cluster method and bootstrap randomization were used to identify significant trophic groups for each fish assemblage in the southern Huanghai Sea. A total of six major trophic groups were identified within this system, which classified predators based upon location in the water column or prey size （ i. e. , benthic to pelagic predators or fish to small invertebrate prey predators）. The similarity level used to identify significant trophic groups in each assemblage ranged from 24% to 34%. Although planktivores were the dominant trophic group in each assemblage （60% - 79% ）, there were spatial and temporal variations in the trophic structure, which reflected the differences in the abundance and availability of dominant preys. Simplified food webs were constructed to evaluate the most important trophic relationships between the dominant prey taxa and the fishes in each assemblage within this system. Although there were some differences in the key prey species among different food webs, pelagic prey items （mainly euphausiids and copepods） represent the most important energetic link between primary producers and higher trophic level predators. The trophic level for most fishes was between 3 and d, and the weighted mean trophic level for each assemblage ranged from 3.3 to 3.4. Compared with previous study in the mid-1980s, there was an obvious downward trend in the trophic level for most fish species, which resulted mainly from the fluctuation in key prey species in the Huanghai Sea. The decrease in the importance of Japanese anchovy seems to be offset by other abundant prey species such as Euphausia pacifica and copepods （ mainly Calanus sinicus ） .

关键词： southern Huanghai Sea trophic guild food web dietary overlap fish assemblage

Cathodic reaction mechanisms in CO2 corrosion of low-Cr steels

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2019年第11期26卷 1405-1414页

作者： jin-yang Zhu Li-ning Xu Min-xu Lu Wei Chang National Center for Materials Service Safety University of Science and Technology BeijingBeijing 100083China Corrosion and Protection Center Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China CNOOC Research Institute Beijing 100027China

The cathodic reaction mechanisms in CO2 corrosion of low-Cr steels were investigated by potentiodynamic polarization and galvanostatic *** but different dominant cathodic reactions were observed at different p H *** the higher p H level(p H>~5),H2 CO3 reduction was the dominant cathodic *** reaction was under activation *** the lower pH level(pH<~3.5),H+reduction became the dominant one and the reaction was under diffusion *** the intermediate area,there was a transition region leading from one cathodic reaction to *** measured electrochemical impedance spectrum corresponded to the proposed cathodic reaction mechanisms.

关键词： low alloy steel carbon dioxide corrosion EIS cathodic reaction mechanisms

Water in the Thickened Lower Crust of the Eastern Himalayan Orogen

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2018年第5期29卷 1040-1048页

作者： Li Zhang Yu ye Shan Qin Zhenmin jin School of Earth and Space Sciences Peking University State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences School of Earth Sciences China University of Geosciences

Water content in nominally anhydrous minerals （NAMs） of the high-pressure （HP） metamorphic rocks controls the thermal structure, rheology and partial melting of orogenic belts. This paper conducts a systematic analysis of water in NAMs of the HP granulites from the Greater Himalayan Sequence （GHS）, representing the thickened lower crust of the eastern Himalayan Orogen. The present result shows that the garnet, clinopyroxene, feldspar, quartz and kyanite contain 188 ppm-432 ppm, 193 ppm-547 ppm, 335 ppm-1 053 ppm, 125 ppm-185 ppm and 89 ppm H2O, respectively, and indicates that the thickened lower crust of the Himalayan Orogen is relatively wet rather than dry. The considerable concentrations of water in the HP granulites are expected to promote the rheological weakening of the metamorphic core of the Himalayan Orogen, providing a favorable evidence for the channel flow model of the exhumation of thickened lower crust.

关键词： micro-FTIR (Fourier transform infrared spectroscopy) water content granulite Himalayan Orogen.

Parametrization of Spin Rotation and the Two-Level Problem

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1996年第3期13卷 161-164页

作者： ZHOU jin-yuan LI Li-yun ye Chao-hui Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of PhysicsChinese Academy of SciencesWuhan 430071

The evolution behavior of a spin system subject to a time-varying magnetic field and the relevant two-level problem essentially exhibit like a rotation in a three-dimensional *** is shown that the parametrization of this rotation is shifted into solving the time-dependent Schrodinger equation of a spin-1/2 system and the rotation parame ters can thus be obtained by a straightforward method.

关键词： method. space. rotation