检索结果-南通市图书馆

Simulated photo-degradation of dissolved organic matter in lakes revealed by three-dimensional excitation-emission matrix with regional integration and parallel factor analysis

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2020年第4期32卷 310-320页

作者： Jin Zhang Fanhao Song Tingting Li Kefu Xie Huiying Yao Baoshan Xing zhongyu Li Yingchen Bai School of Environmental and Safety Engineering Changzhou UniversityJiangsu 213164China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China College of Water Sciences Beijing Normal UniversityBeijing 100875China Department of Chemistry Beijing Normal UniversityBeijing 100875China Stockbridge School of Agriculture University of MassachusettsAmherstMA01003USA

Simulated photo-degradation of fluorescent dissolved organic matter(FDOM) in Lake Baihua(BH) and Lake Hongfeng(HF) was investigated with three-dimensional excitationemission matrix(3 DEEM) fluorescence combined with the fluorescence regional integration(FRI),parallel factor(PARAFAC) analysis,and multi-order kinetic *** the FRI analysis,fulvic-like and humic-like materials were the main constituents for both BH-FDOM and *** individual components were identified by use of PARAFAC analysis as humic-like components(C1),fulvic-like components(C2),protein-like components(C3) and unidentified components(C4).The maximum 3 DEEM fluorescence intensity of PARAFAC components C1-C3 decreased by about 60%,70% and 90%,respectively after *** multi-order kinetic model was acceptable to represent the photo-degradation of FDOM with correlation coefficient(Radj2)(0.963-0.998).The photo-degradation rate constants(kn) showed differences of three orders of magnitude,from 1.09 × 10-6 to 4.02 × 10-4 min-1,and half-life of multi-order model(T1/2n)ranged from 5.26 to 64.01 *** decreased values of fluorescence index(FI) and biogenic index(BI),the fact that of percent fluorescence response parameter of Region I(PⅠ,n) showed the greatest change ratio,followed by percent fluorescence response parameter of Region II(PⅡ,n,while the largest decrease ratio was found for C3 components,and the lowest T1/2n was observed for C3,indicated preferential degradation of protein-like materials/components derived from biological sources during *** research on the degradation of FDOM by 3 DEEM/FRI-PARAFAC would be beneficial to understanding the photo-degradation of FD OM in natural environments and accurately predicting the environmental behaviors of contaminants in the presence of FDOM.

关键词： Fluorescent dissolved organic matter Photo-degradation Fluorescence regional integration Parallel factor analysis Three-dimensional excitationemission matrix Multi-order kinetic models

基于DEM与重力场模型的GPS水准高程处理方法研究

在线全文

学校读者我要写书评

暂无评论

武汉大学学报（信息科学版） 2007年第9期32卷 767-769,795页

作者：马洪滨董仲宇东北大学测绘工程系沈阳市文化路3号巷11号110004

提出了联合使用DEM模型与重力场模型的高程处理方法,用该方法处理了某市8800 km2范围内的15个水准高程数据,并与传统方法进行了比较分析,同时进行了重力场模型的地区匹配试验。试验发现,该方法适用于比高较大、测区范围广,且水准点数目... 详细信息

提出了联合使用DEM模型与重力场模型的高程处理方法,用该方法处理了某市8800 km2范围内的15个水准高程数据,并与传统方法进行了比较分析,同时进行了重力场模型的地区匹配试验。试验发现,该方法适用于比高较大、测区范围广,且水准点数目少、分布情况不好的山区。

关键词： DEM 重力场模型移去-恢复

Reply to Comments on “Efficient full-path optical calculation of scalar and vector diffraction using the Bluestein method”

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2021年第1期10卷 3-4页

作者： Yanlei Hu zhongyu Wang Xuewen Wang Shengyun Ji Chenchu Zhang Jiawen Li Wulin Zhu Dong Wu Jiaru Chu CAS Key Laboratory of Mechanical Behavior and Design of materials Key Laboratory of Precision Scientific Instrum entation of Anhui Higher Education InstitutesDepartm ent of Precision Machinery and Precision InstrumentationUniversity of Science and Techno logy of China230026 HefeiChina Departm ent of Mechanical Engineering and Departm ent of Civil and Environm ental Engineering Massachusetts Institute of TechnologyCam bridgeMA 02139USA State Key Laboratory of Advanced Technology for materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of Technology430070 WuhanChina Institute of Industry and Equipment Technology Hefei Uniersity of Technology230009 HefeiChina

Dear Editor,In *** present an efficient full-path optical calculation by using the Bluestein method.A real optical apparatus for laser processing,imaging,or optical tweezing normally involves diverse optical lenses with different physical and numerical apertures(NA).In such applications,the optical path is usually tortuous and *** assist in the design,evaluation,and alignment of optical instruments,it is advantageous to retrieve the optical field in an arbitrary position along the entire optical path,which is termed the full-path calculation in our paper,with sufficient accuracy and *** particular,high flexibility is required to accommodate the mismatch between optical apertures of different components in the optical *** present a fullpath optical calculation method by adopting the Bluestein method to address this realistic demand.

关键词： optical calculation method

Efficient full-path optical calculation of scalar and vector diffraction using the Bluestein method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2020年第1期9卷 872-882页

作者： Yanlei Hu zhongyu Wang Xuewen Wang Shengyun Ji Chenchu Zhang Jiawen Li Wulin Zhu Dong Wu Jiaru Chu CAS Key Laboratory of Mechanical Behavior and Design of materials Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education InstitutesDepartment of Precision Machinery and Precision InstrumentationUniversity of Science and Technology of ChinaHefei 230026China Department of Mechanical Engineering and Department of Civil and Environmental Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA State Key Laboratory of Advanced Technology for materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China Institute of Industry and Equipment Technology Hefei University of TechnologyHefei 230009China

Efficient calculation of the light diffraction in free space is of great significance for tracing electromagnetic field propagation and predicting the performance of optical systems such as microscopy,photolithography,and ***,existing calculation methods suffer from low computational efficiency and poor ***,we present a fast and flexible calculation method for computing scalar and vector diffraction in the corresponding optical regimes using the Bluestein *** computation time can be substantially reduced to the sub-second level,which is 105 faster than that achieved by the direct integration approach(~hours level)and 102 faster than that achieved by the fast Fourier transform method(~minutes level).The high efficiency facilitates the ultrafast evaluation of light propagation in diverse optical ***,the region of interest and the sampling numbers can be arbitrarily chosen,endowing the proposed method with superior *** on these results,full-path calculation of a complex optical system is readily demonstrated and verified by experimental results,laying a foundation for real-time light field analysis for realistic optical implementation such as imaging,laser processing,and optical manipulation.

关键词： calculation scalar faster

千特斯拉级内爆磁压缩装置初始磁场电源系统研制

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

强激光与粒子束 2024年第2期36卷 112-118页

作者：赵娟程诚李波吴刚匡学武胥超周中玉张旭平唐小松李建明仝延锦谷卓伟中国工程物理研究院流体物理研究所四川绵阳621900

初始磁场电源系统用于激励千特斯拉级内爆磁压缩装置的初级线圈产生初始磁场,是内爆磁压缩装置的关键设备。在分析千特斯拉级内爆磁压缩装置初始磁场电源需求和技术难点的基础上,系统设计了核心部件选择方案和主脉冲电路及控制系统结构... 详细信息

初始磁场电源系统用于激励千特斯拉级内爆磁压缩装置的初级线圈产生初始磁场,是内爆磁压缩装置的关键设备。在分析千特斯拉级内爆磁压缩装置初始磁场电源需求和技术难点的基础上,系统设计了核心部件选择方案和主脉冲电路及控制系统结构,研制成功一套输出电压1~40 kV可调、主放电电流脉冲上升沿约60μs、总峰值电流达3.2 ma的初始磁场电源系统,已应用于千特斯拉级内爆磁压缩装置动态试验。

关键词：爆磁压缩强磁场激励复杂电磁环境精确控制

LncRNA ZFAS1 regulates cardiomyocyte differentiation of human embryonic stem cells

在线全文

学校读者我要写书评

暂无评论

BIOCELL 2023年第6期47卷 1407-1416页

作者： YANG CAO YINING LIU YANG YU XIAOFEI GUO XIUXIU WANG WENYA ma HANJING LI zhongyu REN XINLU GAO SIJIA LI HAOYU JI HONGYANG CHEN HONG YAN YANAN TIAN XIN WANG BENZHI CAI Department of Pharmacy The Second Affiliated Hospital of Harbin Medical University(Institute of Clinical PharmacyThe University Key Laboratory of Drug ResearchHeilongjiang Higher Education Institutions)Harbin150086China Department of Pharmacology(State-Province Key Laboratories of Biomedicine-Pharmaceutics of China Key Laboratory of Cardiovascular Medicine ResearchMinistry of Education)College of PharmacyHarbin Medical UniversityHarbin150081China

Background:Cardiomyocytes derived from human embryonic stem cells(hESCs)are regulated by complex and stringent gene networks during *** non-coding RNAs(lncRNAs)exert critical epigenetic regulatory functions in multiple differentiation ***,the involvement of lncRNAs in the differentiation of hESCs into cardiomyocytes has not yet been fully ***,we identified the key roles of ZFAS1(lncRNA zinc finger antisense 1)in the differentiation of cardiomyocytes from ***:A model of cardiomyocyte differentiation from stem cells was established using the monolayer differentiation method,and the number of beating hESCs-derived cardiomyocytes was *** expression was analyzed by quantitative real-time PCR(qRTPCR).Immunofluorescence assays were performed to assess the expression of cardiac troponin T(cTnT)andα-actinin protein in ***:qRT-PCR showed that ZFAS1 expression in the mesoderm was significantly higher than that in embryonic stem cells,cardiac progenitor cells,and *** of ZFAS1 inhibited cardiomyocyte differentiation from hESCs,which was characterized by reduced expression of the cardiac-specific markers cTnT,α-actinin,myosin heavy chain 6(MYH6),and myosin heavy chain 7(MYH7).In contrast,ZFAS1 overexpression remarkably increased the percentage of spontaneously beating *** terms of the mechanism,we found that ZFAS1 is an antisense lncRNA at the 5′end of the protein-coding gene *** of ZFAS1 could increase the mRNA expression level of ***,qRT-PCR demonstrated that the silencing of ZNFX1 led to an increase in cardiac-specific markers that predicted the promotion of cardiomyocyte ***:Altogether,these data suggest that lncRNA-ZFAS1 is required for cardiac differentiation by functionally inhibiting the expression of ZNFX1,which may provide a reference for the treatment of heart disease to a certain extent.

关键词： Long non-coding RNAs Cardiomyocyte differentiation ZFAS1 ZNFX1

基于SPOC的翻转课堂教学模式在内科护理学教学中的应用研究

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国高等医学教育 2024年第2期 80-82页

作者：李健芝胡丽伍春万艳平曾谷清李忠玉马梦琪莫文娟南华大学护理学院湖南衡阳421001

目的:探讨基于SPOC的翻转课堂教学模式在内科护理学本科教学中的应用及效果。方法:选取2018级两个教学班的护理专业本科生为研究对象,随机抽取一个教学班为试验组(n=67),采用基于SPOC的翻转课堂教学模式,另一个教学班为对照组(n=74),采... 详细信息

目的:探讨基于SPOC的翻转课堂教学模式在内科护理学本科教学中的应用及效果。方法:选取2018级两个教学班的护理专业本科生为研究对象,随机抽取一个教学班为试验组(n=67),采用基于SPOC的翻转课堂教学模式,另一个教学班为对照组(n=74),采用传统教学模式。比较两组学习成绩和自主学习能力,并调查试验组对教学效果的评价。结果:试验组的总评成绩、期中考试成绩、期末考试成绩均高于对照组(P<0.001)。试验组自主学习能力总量表及各分量表得分均高于对照组(P<0.05)。结论:在内科护理学教学中采用基于SPOC的翻转课堂教学模式,有利于提高护生的成绩和自主学习能力,提高教学效果。

关键词： SPOC 翻转课堂自主学习能力内科护理学

Dynamics of passive and active rods in external flows:Fluid particle dynamics simulations

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Dynamics of passive and active rods in external flows:Fluid ...

Zircon U-Pb Geochronology and Hf Isotopic Constraints on Petrogenesis of Plagiogranite from the Cuomuqu Ophiolite,Bangong Lake Area,North Tibet

中国力学大会-2021+1

作者： Kun ma Jian Su zhongyu Yan Qiaolin He Xinpeng Xu College of mathematics Sichuan University Physics Program Guangdong Technion-Israel Institute of Technology

＜正＞～～

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2015年第2期89卷 418-440页

作者： YIN Zhengxin YUAN Yajuan Lü Baofeng CAI Zhourong ZHENG Hao HUANG Qiangtai XIA Bin ZHONG Yun XIA zhongyu SHI Xiaolong GUAN Yao School of marine Sciences Sun Yat-sen University Key Laboratory of Offshore Oil Exploration and Development of Guangdong Higher Education Institutes Guangdong Provincial Key Laboratory of marine Resources and Coastal Engineering

Field observation, geochemical signatures and zircon Hf isotope data indicate that Cuomuqu ophiolite in the Bangonghu area was formed in a back-arc basin （BAB） above a supra- subduction zone （SSZ）. Zircon U-Pb dating of the diabase from the Cuomuqu massif yielded an age of 164.3±1.9 ma, thus indicating that the ophiolite complex was formed in the Middle Jurassic during back-arc extension of the mature Bangonghu-Nujiang Ocean. The zircon εHf（t） and TDMC values of the plagiogranite are similar to the εHf（t） and TDM of the diabase, respectively. The mode of occurrence of plagiogranites and their bulk-rock and Hf isotope characteristics indicate that they were derived from the mantle, associated with the surrounding gabbro and diabase, and were formed by partial melting of altered and hydrated mafic rocks under shear conditions during lateral drifting of the oceanic crust. The zircon U-Pb age of the plagiogranite is 156.4±1.4 ma, and it is 7.9 ma younger than the hosting diabase. In this study, zircon chronological and Hf isotopic data were tentatively analyzed to determine the genesis of plagiogranites in the Cuomuqu ophiolite complex.

关键词： Bangonghu-Nujiang suture zone ophiolite plagiogranite zircon U-Pb dating zircon Hf isotope tectonic setting