检索结果-南通市图书馆

Longitudinal dispersion coefficients of pollutants in compound channels with vegetated floodplains

Journal of Hydrodynamics 2019年第4期31卷 740-749页

作者： Li Gu Xin-xin Zhao ling-hang Xing zi-nan Jiao Zu-lin Hua Xiao-dong liu Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education College of Environment Hohai University Nanjing 210098 China National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety Hohai University Nanjing 210098 China Nanjing Guohuan Science and Technology Co. Ltd. Nanjing 210001 China Changjiang River Scientific Research Institute Wuhan 430010 China

The characteristics of the longitudinal dispersion of pollutants in compound channels remain unclear. This study examines the relationships among the vegetation density, the width of the floodplain, the water depth ratio, the cross-sectional mean velocity, and the longitudinal dispersion coefficient of a symmetrical compound channel with a rigid non-submerged vegetated floodplain. The longitudinal dispersion coefficient is found to increase significantly with the presence of vegetation on floodplains, and is positively correlated with the plant density. When the density of the vegetation on the floodplains exceeds a certain value, the dispersion coefficient no longer changes with the vegetation density. The longitudinal dispersion coefficient is found to increase with the increase of the width of the floodplain. Moreover, the combined effects of the mean velocity and the water depth ratio have a positive correlation with the dispersion coefficient. The effects of the vegetation on the longitudinal dispersion coefficient in the channels with various cross-sections are also compared. The compound channels with a vegetated floodplain are found to differ significantly from the channels with a rectangular cross-section.

关键词： Compound channel longitudinal dispersion coefficient relationship vegetated floodplain

来源：

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

Synthesis and Extended 3D Hydrogen-bonded Structure of Complex Tris(violurato-N,O) Cobalt(III) Hexahydrate

引用

Chinese Journal of Structural Chemistry 2006年第2期25卷 163-167页

作者： XIAO zi-Jing liu Shi-Xiong Central Laboratory Fuzhou University Fuzhou 350002 China College of Materials Science and Engineering Huaqiao University Quanzhou 362011 China State Key Laboratory of Structural Chemistry Fuzhou 350002 China

The cobalt（Ⅲ） violurato complex （[Co（C4H2N3O4）3]·6H2O, Mr = 635.28） has been prepared and structurally characterized. The crystal is of monoclinic, space group P2 1/n with a = 10.176（1）, b = 11.8010（9）, c = 19.706（2） A°, β= 97.382（3）°, V= 2346.9（4）A°^3, Z = 4, Dc= 1.798 g/cm^3, F（000） = 1296, μ = 0.839 mm^-1, R = 0.0482 and wR = 0.1357. The Co atom in the title compound is six- coordinated by three carbonyl O atoms and three oximido N atoms of three violurato ligands, forming an octahedral coordination geometry. The neighboring molecules are connected together by hydrogen bonds of N-H…O, O-H…O and O-H…N, forming an extended three-dimensional supra- molecular architecture.

关键词： Co(Ⅲ) complex violuric acid crystal structure hydrogen bond

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Regulatory factors of Nrf2 in age-related macular degeneration pathogenesis

引用

International Journal of Ophthalmology(English edition) 2024年第7期17卷 1344-1362页

作者： zi-ling Hu Yu-Xuan Wang zi-Yue lin Wen-Shuo Ren Bo liu Hui Zhao Qiong Qin Five Year Program of Ophthalmology and Optometry 2019 Beijing Tong Ren HospitalCapital Medical UniversityBeijing 100054China Four Year Program of Traditional Chinese Pharmacy 2020 School of Traditional Chinese MedicineCapital Medical UniversityBeijing 100069China School of Traditional Chinese Medicine Capital Medical UniversityBeijing 100069China Beijing Key Laboratory of TCM Collateral Disease Theory Research Beijing 100069China Five Year Program of Ophthalmology and Optometry 2021 School of Basic Medical SciencesCapital Medical UniversityBeijing 100069China Biochemistry&Molecular Biology School of Basic Medical SciencesCapital Medical UniversityBeijing 100069China

Age-related macular degeneration(AMD)is a complicated disease that causes irreversible visual *** evidences pointed retinal pigment epithelia(RPE)cells as the decisive cell involved in the progress of AMD,and the function of anti-oxidant capacity of PRE plays a fundamental physiological *** factor erythroid 2 related factor 2(Nrf2)is a significant transcription factor in the cellular anti-oxidant system as it regulates the expression of multiple anti-oxidative *** functions of protecting RPE cells against oxidative stress(OS)and ensuing physiological changes,including inflammation,mitochondrial damage and autophagy dysregulation,have already been *** the roles of upstream regulators of Nrf2 could provide further insight to the OS-mediated AMD *** the first time,this review summarized the reported upstream regulators of Nrf2 in AMD pathogenesis,including proteins and miRNAs,and their underlying molecular mechanisms,which may help to find potential targets via regulating the Nrf2 pathway in the future research and further discuss the existing Nrf2 regulators proved to be beneficial in preventing AMD.

关键词： Nrf2 upstream regulators retinal pigment epithelia age-related macular degeneration oxidative stress

来源：

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

Adenovirus-mediated wild-type p53 gene transfer in combination with bronchial arterial infusion for treatment of advanced non-small-cell lung cancer,one year follow-up

引用

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2009年第5期10卷 331-340页

作者： Yong-song GUAN Yuan liu Qing ZOU Qing HE zi LA lin YANG Ying HU Department of Oncology West China Hospital of Sichuan University Chengdu 610041 China State Key Laboratory of Biotherapy West China Medical School Sichuan University Chengdu 610041 China

Objective： In the present study, we have examined the safety and efficacy of recombinant adenovirus encoding human p53 tumor suppressor gene （rAd-p53） injection in patients with advanced non-small-cell lung cancer （NSCLC） in the combination with the therapy of bronchial arterial infusion （BAI）. Methods： A total of 58 patients with advanced NSCLC were enrolled in a non-randomized, two-armed clinical trial. Of which, 19 received a combination treatment of BAI and rAd-p53 （the combo group）, while the remaining 39 were treated with only BAI （the control group）. Patients were followed up for 12 months, with safety and local response evaluated by the National Cancer lnstitute＇s Common Toxicity Criteria and response evaluation criteria in solid tumor （RECIST）, respectively. Time to progression （TTP） and survival rates were also analyzed by Kaplan-Meier method. Results In the combo group, 19 patients received a total of 49 injections ofrAd-p53 and 46 times of BAI, respectively, while 39 patients in the control group received a total of 113 times of BAI. The combination treatment was found to have less adverse events such as anorexia, nausea and emesis, pain, and leucopenia （P〈0.05） but more arthralgia, fever, influenza-like symptom, and myalgia （P〈0.05）, compared with the control group. The overall response rates （complete response （CR）＋partial response （PR）） were 47.3% and 38.4% for the combo group and the control group, respectively （P〉0.05）. Patients in the combo group had a longer TTP than those in the control group （a median 7.75 vs 5.5 months, P-0.018）. However, the combination treatment did not lead to better survival, with survival rates at 3, 6, and 12 months in the combo group being 94.74%, 89.47%, and 52.63%, respectively, com- pared with 92.31%, 69.23%, and 38.83% in the control group （P=0.224）. Conclusion： Our results show that the combination of rAd-p53 and BAI was well tolerated in patients with NSCLC and may have improved the quality of life and delayed the

关键词： RAd-p53 gene therapy Clinical trial Non-small-cell lung cancer (NSCLC) Bronchial arterial infusion (BAI)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Clustering and precipitation in Al-Mg-Si alloys during linear heating

引用

Journal of Materials Science & Technology 2022年第25期120卷 78-88页

作者： zi Yang Igor Erdle Chunhui liu John Banhart Helmholtz-Centre Berlin for Materials and Energy Hahn-Meitner-Platz 1Berlin 14109Germany State Key Laboratory of High-Performance Complex Manufacturing Central South UniversityChangsha 410083China

Differential scanning calorimetry(DSC) is a technique extensively applied to analyse precipitation phenomena in Al-Mg-Si alloys, yet the processes occurring during non-isothermal DSC heating, in particular the formation of clusters in the early stage and their evolution at higher temperatures, remain obscure. Here, we carry out experiments not only to measure heat(via DSC) but also to measure hardness,positron lifetime, electrical resistivity and microstructure of an Al-Mg-Si alloy heated at 3 different *** resistivity is measured in situ, the other properties after interrupting the heating process. It is demonstrated that the precipitation process during heating can be divided into various stages, with transition temperatures depending on the heating rate, but the relative behavior of the various measured quantities is connected in the same way. Quenched-in excess vacancies are found to play an important role in cluster formation at lower temperatures, which explains the seeming peculiarity that linear heating at lower temperatures can lead to stronger clustering than isothermal ageing at a higher *** trends are well simulated using a recently developed precipitation model. New aspects about the evolution of these clusters at higher temperatures are revealed by correlating the different measured properties. The methodology applied here could also be extended to investigating more complex nonisothermal heat treatments.

关键词： Al alloys Al-Mg-Si Non-isothermal ageing linear heating Precipitation hardening Solute clustering Vacancies

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Transition metal-catalyzed conversion of aldehydes to ketones

引用

Chinese Chemical Letters 2022年第3期33卷 1207-1226页

作者： zijuan Yan Pan-lin Shao Qing Qiang Feipeng liu Xuchao Wang Yongjie Li zi-Qiang Rong Frontiers Science Center for Flexible Electronics(FSCFE) Shaanxi Institute of Flexible Electronics(SIFE)&Shaanxi Institute of Biomedical Materials and Engineering(SIBME)Northwestern Polytechnical University(NPU)Xi'an 710072China College of Innovation and Entrepreneurship Southern University of Science and TechnologyShenzhen 518055China

Ketones are one of the most important classes of organic compounds, and widely present in various pharmacological compounds, biologically active molecules and functional materials. Over the past few decades, transition metal-catalyzed conversion of aldehydes has been found to be a powerful *** the continuous development in recent years, it has become an efficient and uncomplicated strategy for constructing ketones. There are four major mechanisms for transition metal-catalyzed ketone synthesis from aldehyde:(1) carbonyl-Heck reaction, that is 1,2-insertion of organometal species to aldehydic C=O double bond,(2) direct insertion of transition metal catalysts to aldehydic C-H bond,(3) aldehyde as acyl radical,(4) aldehyde as carbon radical acceptor. This article summarizes related reports on the transformations of aldehydes to generate corresponding ketones under different reaction conditions.

关键词： Homogeneous catalysis Transition metal catalysis Direct conversion Ketone synthesis C-H bond functionalization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Optimization of Supercontinuum Sources for Ultra-Broadband T-CARS Spectroscopy

引用

Chinese Physics Letters 2011年第3期28卷 78-80页

作者： liu Xing liu Wei YIN Jun QU Jun-Le lin zi-Yang NIU Han-Ben Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060 College of Precision Instrument and Optoelectronics Engineering Tianjin UniversityTianjin 300072

For a typical photonic crystal fiber with two zero-dispersion wavelengths,we theoretically demonstrate a new way to generate supercontinuum using an input pulse of 30fs duration and lOkW peak power for providing a compact and cost effective light source to the ultra-broadband time-resolved coherent anti-Stokes Raman scattering spectroscopy.

关键词： spectroscopy continuum coherent

来源：

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

Hydrogen-Bonding Crosslinked Supramolecular Polymer Materials:From Design Evolution of Side-Chain Hydrogen-Bonding to Applications

引用

Chinese Journal of Polymer Science 2024年第11期42卷 1619-1641,I0006页

作者： Qian Zhang zi-Yang Xu Wen-Guang liu School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional MaterialsTianjin UniversityTianjin300350China

Hydrogen bonds(H-bonds)are the most essential non-covalent interactions in nature,playing a crucial role in stabilizing the secondary structures of *** inspiration from nature,researchers have developed several multiple H-bonds crosslinked supramolecular polymer materials through the incorporation of H-bond side-chain units into the polymer chains.N-acryloyl glycinamide(NAGA)is a monomer with dual amides in the side group,which facilitates the formation of multiple dense intermolecular H-bonds within poly(N-acryloyl glycinamide)(PNAGA),thereby exhibiting diverse properties dependent on concentration and meeting various requirements across different ***,numerous attempts have been undertaken to synthesize diverse NAGA-derived units through meticulous chemical structure regulation and fabricate corresponding H-bonding crosslinked supramolecular polymer *** this,the systematic clarification of the impact of chemical structures of side moieties on intermolecular associations and material performances remains *** present review will focus on the design principle for synthesizing NAGA-derived H-bond side-chain units and provide an overview of the recent advancements in multiple H-bonds crosslinked PNAGA-derived supramolecular polymer materials,which can be categorized into three groups based on the chemical structure of H-bonds units:(1)monomers with solely cooperative H-bonds;(2)monomers with synergistic H-bonds and other physical interactions;and(3)diol chain extenders with cooperative *** significance of subtle structural variations in these NAGA-derived units,enabling the fabrication of hydrogen-bonded supramolecular polymer materials with significantly diverse performances,will be ***,the extensive applications of multiple H-bonds crosslinked supramolecular polymer materials will be elucidated.

关键词： Hydrogen bonds High strength Side chain Supramolecular polymer materials

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

ON POTENT ELEMENTS AND PSEUDO CLEAN RINGS

引用

数学杂志 2025年第1期45卷 39-47页

作者： DING Yan GAO Han-peng liu Xin-yi YAN zi-yi ZHANG Ting School of Mathematical Sciences Anhui UniversityHefei 230601China

In this paper,potent index of an element and pseudo clean rings are *** properties and examples of pseudo clean rings are *** also show that Zm is pseudo clean for every 2≤m∈Z and pseudo clean rings are ***,we prove... 详细信息

关键词： clean rings strongly J-clean rings pseudo clean rings potent elements

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A comparative electrochemical investigation of silicon nanowires formation via metal-catalyzed electroless etching

引用

Science China(Technological Sciences) 2015年第2期58卷 362-368页

作者： liu lin Beijing Key Laboratory of Energy Conversion and Storage Materials Beijing Normal University Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education North China Electric Power University

In this study, the electrochemical behavior of monocrystalline bare Si and Ag-coated Si in hydrofluoric acid （HF） solutions with and without hydrogen peroxide （H202） was systematically tested with an electrochemical technique. By analyzing the po- larization curves, the corrosion processes were quantified and the etchants which govern the formation of silicon nanowires （SiNWs） were determined. It was discovered that both H202 and Ag enhanced the reduction reactions, irrespective of the con- ductivity type and doping concentration of Si. It is believed that the formation of SiNWs via Metal-Catalyzed Electroless Etching is a process controlled by cathodic reduction reactions.

关键词： silicon nanowires polarization curve electrochemistry

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：