检索结果-南通市图书馆

环形腔激光网络对激光斑图信号的聚类同步传输

在线全文

学校读者我要写书评

暂无评论

中国科学：物理学、力学、天文学 2017年第8期47卷 74-83页

作者：吕翎李成仁李钢赵冠男辽宁师范大学物理与电子技术学院大连116029

本文在Lugiato等人工作的基础上,发现在考虑了激光的横向效应后,环形腔激光器的激光输出不但能够呈现合作频率锁定以及准周期振荡行为,而且还会呈现新的湍流效应,并模拟展示了相应的激光斑图.进一步利用环形腔激光器构成激光网络对激光... 详细信息

本文在Lugiato等人工作的基础上,发现在考虑了激光的横向效应后,环形腔激光器的激光输出不但能够呈现合作频率锁定以及准周期振荡行为,而且还会呈现新的湍流效应,并模拟展示了相应的激光斑图.进一步利用环形腔激光器构成激光网络对激光斑图信号进行了聚类同步传输.在我们设计的技术方案中,允许网络中存在不确定参数.并且,激光网络中聚类的划分、拓扑结构以及每个聚类中的节点数目不受任何限制.

关键词：聚类同步传输网络激光斑图环形腔激光器

在线全文

学校读者我要写书评

暂无评论

体育锻炼增进个体健康的经济学分析

天津体育学院学报 2004年第2期19卷 94-96页

作者：李芾赵立首都体育学院研究生部北京100088

从经济学的原理出发,运用文献资料法、逻辑分析法、成本—收益分析法,试图阐明健康的经济学特性,分析体育锻炼增进健康的成本、收益及其经济学特点。结论:体育锻炼增进健康具有生产与消费的同一性、非实物性、边际效用递减等经济学特点... 详细信息

从经济学的原理出发,运用文献资料法、逻辑分析法、成本—收益分析法,试图阐明健康的经济学特性,分析体育锻炼增进健康的成本、收益及其经济学特点。结论:体育锻炼增进健康具有生产与消费的同一性、非实物性、边际效用递减等经济学特点;体育锻炼的成本主要由物质成本、时间的机会成本、门票或会员票构成,体育锻炼的进入成本主要是时间的而非物质的;体育锻炼的收益具有长期性、难以量化性以及主体确定性。

关键词：体育锻炼健康经济学

Single-cell omics: experimental workflow, data analyses and applications

在线全文

学校读者我要写书评

暂无评论

Science China life Sciences 2025年第1期68卷 5-102页

作者： Fengying Sun Haoyan li Dongqing Sun Shaliu Fu Lei Gu Xin Shao Qinqin Wang Xin Dong Bin Duan Feiyang Xing Jun Wu Minmin Xiao Fangqing zhao Jing-Dong J.Han Qi liu Xiaohui Fan Chen li Chenfei Wang Tieliu Shi Department of Clinical Laboratory the Affiliated Wuhu Hospital of East China Normal University (The Second People's Hospital of Wuhu City) Pharmaceutical Informatics Institute College of Pharmaceutical SciencesZhejiang University Key Laboratory of Spine and Spinal Cord Injury Repair and Regeneration (Tongji University) Ministry of EducationOrthopaedic DepartmentTongji HospitalBioinformatics DepartmentSchool of Life Sciences and TechnologyTongji University Frontier Science Center for Stem Cells School of Life Sciences and TechnologyTongji University Translational Medical Center for Stem Cell Therapy and Institute for Regenerative Medicine Shanghai East HospitalBioinformatics DepartmentSchool of Life Sciences and TechnologyTongji University Research Institute of Intelligent Computing Zhejiang Lab Shanghai Research Institute for Intelligent Autonomous Systems Center for Single-cell Omics School of Public HealthShanghai Jiao Tong University School of Medicine National Key Laboratory of Chinese Medicine Modernization Innovation Center of Yangtze River DeltaZhejiang University Center for Bioinformatics and Computational Biology Shanghai Key Laboratory of Regulatory Biologythe Institute of Biomedical Sciences and School of Life SciencesEast China Normal University Beijing Institutes of life Science Chinese Academy of Sciences Peking-Tsinghua Center for life Sciences Academy for Advanced Interdisciplinary StudiesCenter for Quantitative Biology (CQB)Peking University Zhejiang Key Laboratory of Precision Diagnosis and Therapy for Major Gynecological Diseases Women's HospitalZhejiang University School of Medicine Key Laboratory of Advanced Theory and Application in Statistics and Data Science-MOE School of StatisticsEast China Normal University

Cells are the fundamental units of biological systems and exhibit unique development trajectories and molecular features. Our exploration of how the genomes orchestrate the formation and maintenance of each cell, and control the cellular phenotypes of various organismsis, is both captivating and intricate. Since the inception of the first single-cell RNA technology, technologies related to single-cell sequencing have experienced rapid advancements in recent years. These technologies have expanded horizontally to include single-cell genome, epigenome,proteome, and metabolome, while vertically, they have progressed to integrate multiple omics data and incorporate additional information such as spatial sc RNA-seq and CRISPR screening. Single-cell omics represent a groundbreaking advancement in the biomedical field,offering profound insights into the understanding of complex diseases, including cancers. Here, we comprehensively summarize recent advances in single-cell omics technologies, with a specific focus on the methodology section. This overview aims to guide researchers in selecting appropriate methods for single-cell sequencing and related data analysis.

关键词： single-cell sequencing genome epigenome proteomics metabolomics multimodal spatial transcriptomics CRISPR screening

植物篱对石灰土坡耕地理化性质及磷素流失的影响

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

水土保持学报 2017年第5期31卷 14-18,24页

作者：李波李晔赵绍林肖华锋李豪瑞武汉理工大学资源与环境工程学院武汉430070

在三峡库区香溪河流域典型石灰土坡耕地通过修建标准径流小区,设置栀子花(灌木)和黑麦草(草本)植物篱,研究不同类型植物篱对石灰土坡耕地耕层土壤理化性质及磷素流失特征的影响。结果表明:植物篱系统可有效的增加土壤耕层细颗粒含量和... 详细信息

在三峡库区香溪河流域典型石灰土坡耕地通过修建标准径流小区,设置栀子花(灌木)和黑麦草(草本)植物篱,研究不同类型植物篱对石灰土坡耕地耕层土壤理化性质及磷素流失特征的影响。结果表明:植物篱系统可有效的增加土壤耕层细颗粒含量和减小土壤容重,从而改善土壤分形特征,增强土壤疏通性及含水量,达到增大石灰土坡耕地土壤抗蚀性指数和防治土壤养分流失的目的;2种类型植物篱在不同深度耕层、植物篱带内和带间对石灰土坡耕地理化性质及磷素流失的影响表现出一定的差异性,但总体上差异不显著;土壤耕层黏粒含量与土壤中Ca_8-P、Al-P、Fe-P、O-P和Ca_(10)-P的含量均达到了极显著正相关(r=0.772,0.805,0.603,0.682,0.738),土壤容重与土壤黏粒含量存在显著的负相关关系(r=-0.648),表明植物篱系统是通过对土壤黏粒的有效阻滞和富集,从而减小石灰性土壤容重和磷素的流失,实现改善石灰土坡耕地土壤理化性质和防治农业面源污染的效果。

关键词：香溪河石灰土植物篱磷素流失土壤理化性质

Double [5]carbohelicene: facile synthesis, chiroptical properties,isomerization study, and lasing application

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第1期 233-240页

作者： Peipei liu Yantong li Meng-Xiang Wu Hao Kang Xiao-li zhao lin Xu linlin liu Xiaodong li Junfeng Fang Zhiwei Fang Ya Cheng Hai-Bo Yang Huakang Yu Xueliang Shi State Key Laboratory of Petroleum Molecular & Process Engineering Shanghai Key Laboratory of Green Chemistry and Chemical ProcessesSchool of Chemistry and Molecular Engineering East China Normal University School of Physics and Optoelectronics South China University of Technology Institute of Polymer Optoelectronic Materials & Devices State Key Laboratory of Luminescent Materials & Devices South China University of Technology School of Physics and Electronic Science Engineering Research Center of Nanophotonics & Advanced Instrument Ministry of EducationEast China Normal University State Key Laboratory of Precision Spectroscopy School of Physics and Electronic Science East China Normal University

Double carbohelicenes have attracted considerable attention due to their aesthetic structures, distinct π-conjugation extension, inherent chirality, and intriguing optical and electronic properties. Herein, the concise de novo synthesis of a new double[5]carbohelicene 1 together with its chiroptical properties, isomerization process and lasing application is presented. 1 was synthesized by a simple protocol involving the formation of a 6,6′-bipentacene as the key intermediate. It is worth noting that1 existed as two diastereomers 1-PP/MM and 1-PM, which were successfully isolated and unambiguously confirmed by Xray crystallography. The optical resolution of the racemic 1-PP/MM was successfully achieved by chiral-phase highperformance liquid chromatography（HPLC）, and 1-PP and 1-MM were characterized by circular dichroism. Interestingly, it was found that 1-PP/MM could be completely isomerized to 1-PM upon heating, and the detailed thermodynamics and kinetics of the isomerization process were systematically investigated. 1-PM exhibited deep-red luminescence with emission maximum at 723 nm and fluorescence quantum yield as high as 32.95%. Consequently, we can showcase the lasing application of 1-PM by doping with epoxy resin to assemble a bottle microlaser spontaneously, which the lasing wavelength is 796.6 nm at a threshold of 0.8 m J cm-2. We believe that our studies, including the facile synthesis methodology, detailed isomerization studies, and lasing application, will shed some light on the design and synthesis of novel carbohelical systems with more functions.

关键词：

同方期刊数据库

在线全文

学校读者我要写书评

暂无评论

氯酚类化合物对淡水发光菌Q67的联合毒性

环境科学研究 2008年第2期21卷 115-119页

作者：刘征涛李兆利李政中国环境科学研究院国家环境保护化学品生态效应与风险评估重点实验室北京100012

以淡水发光菌Q67——青海弧菌Q67(Vibrio qinghaiensissp.-Q67)为生物材料,分别研究了2-氯酚,2,4-二氯酚和2,3,4-三氯酚及其等剂量、等毒性单位配比混合物的发光抑制毒性,并采用相加指数法和相似性参数法评价了混合物的联合毒性效应.结... 详细信息

以淡水发光菌Q67——青海弧菌Q67(Vibrio qinghaiensissp.-Q67)为生物材料,分别研究了2-氯酚,2,4-二氯酚和2,3,4-三氯酚及其等剂量、等毒性单位配比混合物的发光抑制毒性,并采用相加指数法和相似性参数法评价了混合物的联合毒性效应.结果表明:3种氯酚对Q67菌的EC50值分别为99.57,25.19和3.42 mg/L,说明氯酚类化合物对发光菌的急性毒性随着氯原子数目的增加而增大,氯酚的二元和三元混合物的毒性作用明显高于化合物的单一毒性.2种评价指数均采用评价标准的95%置信区间,避免了由实验误差引起的不准确性.氯酚混合物对Q67菌的联合毒性效应主要表现为简单的相加作用,只有2-氯酚与2,3,4-三氯酚的组合为弱的协同作用.氯酚的等剂量和等毒性配比混合物毒性作用的评价结果相一致.

关键词： 2-氯酚 2,4-二氯酚 2,3,4-三氯酚青海弧菌Q67 联合毒性

甲氧滴滴涕对人绒毛外滋养细胞的白细胞表面抗原G(HLA-G)表达的影响

在线全文

学校读者我要写书评

暂无评论

生殖与避孕 2009年第1期29卷 17-20页

作者：侯蕾陈必良赵尹霄赵莉莉 96401部队537医院第四军医大学西京医院妇产科

目的:探讨甲氧滴滴涕(MXC)对绒毛外滋养细胞(EVCT)白细胞表面抗原G(HLA-G)表达的影响。方法:用胰蛋白酶消化加流式细胞仪分离得到人绒毛外滋养细胞,进行原代培养及鉴定。将所获细胞分为MXC(1μmol/L、3μmol/L、5μmol/L、7μmol/L)处... 详细信息

目的:探讨甲氧滴滴涕(MXC)对绒毛外滋养细胞(EVCT)白细胞表面抗原G(HLA-G)表达的影响。方法:用胰蛋白酶消化加流式细胞仪分离得到人绒毛外滋养细胞,进行原代培养及鉴定。将所获细胞分为MXC(1μmol/L、3μmol/L、5μmol/L、7μmol/L)处理组及空白对照组,培养12h、24h、48h。用Western blotting检测各组各时间点HLA-G的表达,同时用RT-PCR法检测HLA-GmRNA表达。结果:MXC处理组滋养细胞HLA-G表达呈时间剂量依赖性下降,HLA-G mRNA变化与其一致。结论:MXC可从蛋白和mRNA水平降低绒毛外滋养细胞HLA-G表达,从而降低其免疫耐受功能。

关键词：甲氧滴滴涕(MXC) 绒毛外滋养细胞(EVCT) 白细胞表面抗原G(HLA-G)

在线全文

学校读者我要写书评

暂无评论

家庭背景对非认知能力影响的实证研究

教育发展研究 2017年第1期37卷 45-52页

作者：李丽赵文龙边卫军西安交通大学人文社会科学学院西安710049

非认知能力对一个人社会经济地位的获得至关重要,本文利用中国教育追踪调查(CEPS)数据,分析了非认知能力的效应及影响因素。结果发现:非认知能力对学业成绩有显著的正向效应;家庭阶层地位、父母教育程度及家庭经济条件等主要家庭背景因... 详细信息

非认知能力对一个人社会经济地位的获得至关重要,本文利用中国教育追踪调查(CEPS)数据,分析了非认知能力的效应及影响因素。结果发现:非认知能力对学业成绩有显著的正向效应;家庭阶层地位、父母教育程度及家庭经济条件等主要家庭背景因素都对非认知能力有显著影响;文化资本对非认知能力的获得有显著正向影响,是家庭背景影响非认知能力的中间机制之一。

关键词：家庭背景文化资本非认知能力

Moment Redistribution Effect of the Continuous Glass Fiber Reinforced Polymer-Concrete Composite Slabs Based on Static Loading Experiment

在线全文

学校读者我要写书评

暂无评论

Structural Durability & Health Monitoring 2025年第1期19卷 105-123页

作者： zhao-Jun Zhang Wen-Wei Wang Jing-Shui Zhen Bo-Cheng li De-Cheng Cai Yang-Yang Du Hui Huang Offshore Oil Engineering Co.Ltd. Tianjin300461China Department of Bridge Engineering School of TransportationSoutheast UniversityNanjing211189China

This study aimed to investigate the moment redistribution in continuous glass fiber reinforced polymer(GFRP)-concrete composite slabs caused by concrete cracking and steel bar yielding in the negative bending moment *** experimental bending moment redistribution test was conducted on continuous GFRP-concrete composite slabs,and a calculation method based on the conjugate beam method was *** composite slabs were formed by combining GFRP profiles with a concrete layer and supported on steel beams to create two-span continuous composite slab *** methods,epoxy resin bonding,and stud connection,were used to connect the composite slabs with the steel *** experimental findings showed that the specimen connected with epoxy resin exhibited two moments redistribution phenomena during the loading process:concrete cracking and steel bar yielding at the internal *** contrast,the composite slab connected with steel beams by studs exhibited only one-moment redistribution phenomenon throughout the loading *** the concrete at the internal support cracked,the bending moment decreased in the internal support section and increased in the midspan *** the steel bars yielded,the bending moment further decreased in the internal support section and increased in the mid-span *** GFRP profiles do not experience cracking,there was no significant decrease in the bending moment of the mid-span *** test specimens experienced compressive failure of concrete at the mid-span *** results showed good agreement between the calculated and experimental values of bending moments in the mid-span section and internal support *** proposed model can effectively predict the moment redistribution behavior of continuous GFRP-concrete composite slabs.

关键词： Moment redistribution GFRP-concrete composite slabs bending moment experimental study analysis model