检索结果-南通市图书馆

Phosphorus substitution into Co_(3)S_(4) nanoneedle arrays for efficient hydrogen evolution catalysis

Journal of Materials Science & Technology 2021年第30期89卷 52-58页

作者： zhangtao Guo Gaoqi Tian Lin Liu Binyu zhang Qiang Wu Yang Cao Jinchun Tu Lei Ding xiaolin zhang State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and EngineeringHainan UniversityHaikou 570228China School of Tropical Medicine and Laboratory Medicine MOE Key Laboratory of Emergency and TraumaHainan Medical UniversityHaikou 571199China Key Laboratory Of Child Cognition&Behavior Development Of Hainan Province Qiongtai Normal UniversityHaikou 571127China

Transition-metal based hybrids with excellent stability and activity are favorable candidates for hydrogen evolution reaction(HER).The development of typical Co_(3)S_(4)has recently received considerable attention due to the multiple valences of the spinel-structured ***,the in-depth effect of the dopants on the HER performance of Co_(3)S_(4)has not been systematically ***,we report a sequential synthesis of a spinel-structured cobalt phosphosulfate nanoneedle arrays grown on carbon cloth(namely,P-Co_(3)S_(4)/CC).Results indicate that P-Co_(3)S_(4)/CC exhibits high electrocatalytic performance for HER with a low overpotential of 65 mV to drive10 mAcm……(-2),a small Tafel slope of 76.6 mV per decade,and great long-term stability for 25 h at various current densities in alkaline *** first-principle calculation result reveals that the phosphorous doping work at Co_(3)S_(4)enhances the HER performance significantly because the tetrahedral Co^(2+)active sites nearest the P atoms more easily weaken the H-O bond to form *** experiment result characterization and theoretical calculations further show that the introduction of P atom not only offers more active sites but also improves the electrical conductivity in an alkaline electrolyte ***,the identification of active species provides feasible guidance for the further design of high-performance spinel-structured catalysts.

关键词： P-Co_(3)S_(4)/CC P substitution Electronic conductivity HER

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

Accurate construction of cell membrane biomimetic graphene nanodecoys via purposeful surface engineering to improve screening efficiency of active components of traditional Chinese medicine

引用

Acta Pharmaceutica Sinica B 2022年第1期12卷 394-405页

作者： Qi Hu Lanlan Jia xiaolin zhang Aihong Zhu Sicen Wang Xiaoyu Xie School of Pharmacy Health Science CenterXi’an Jiaotong UniversityXi'an 710061China Shaanxi Engineering Research Center of Cardiovascular Drugs Screening&Analysis Xi'an 710061China

Biomimetic nanoengineering presents great potential in biomedical research by integrating cell membrane(CM) with functional nanoparticles. However, preparation of CM biomimetic nanomaterials for custom applications that can avoid the aggregation of nanocarriers while maintaining the biological activity of CM remains a challenge. Herein, a high-performance CM biomimetic graphene nanodecoy was fabricated via purposeful surface engineering, where polyethylene glycol(PEG) was used to modifying magnetic graphene oxide(MGO) to improve its stability in physiological solution, so as to improve the screening efficiency to active components of traditional Chinese medicine(TCM). With this strategy, the constructed PEGylated MGO(PMGO) could keep stable at least 10 days, thus improving the CM coating efficiency. Meanwhile, by taking advantage of the inherent ability of He La cell membrane(HM) to interact with specific ligands, HM-camouflaged PMGO showed satisfied adsorption capacity(116.2 mg/g) and selectivity. Finally, three potential active components, byakangelicol, imperatorin,and isoimperatorin, were screened from Angelica dahurica, whose potential antiproliferative activity were further validated by pharmacological studies. These results demonstrated that the purposeful surfaceengineering is a promising strategy for the design of efficient CM biomimetic nanomaterials, which will promote the development of active components screening in TCM.

关键词： Cell membrane Biomimetic nanoengineering Purposeful surface engineering Graphene oxide Dispersity Active components screening Traditional Chinese medicine PEGylation

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

Antioxidant systems of aquatic macrophytes in three life forms:a case study in Lake Erhai,China

引用

Journal of Oceanology and Limnology 2019年第2期37卷 665-674页

作者： YUAN Changbo ZHU Tianshun CAO Te XI Yilong zhang xiaolin NI Leyi Donghu Experimental Station of Lake Ecosystems State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology Chinese Academy of Sciences Wuhan 430072 China Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang City Belt Anhui Province College of Life Sciences Anhui Normal University Wuhu 241000 China College of Life Sciences Zaozhuang University Zaozhuang 277160 China University of Chinese Academy of Sciences Beijing 100049 China

Antioxidant systems are vital in life activities of macrophytes. Species with diff erent life forms need to cope with distinct environments by modifying physiological characters, especially antioxidant systems. In order to find diff erences among life forms and consequence of lake eutrophication, we studied three antioxidant enzymes activity (superoxide dismutase (SOD), ascorbate oxidase (APX) and catalase (CAT)) and total soluble phenolics (TP) content in leaves of 26 macrophyte species in September 2013 in Lake Erhai, China. We found that antioxidation varied accordingly with life forms. The activities of SOD and APX in emergent macrophytes (EM) and floating-leaved macrophytes (FM) were much lower than those of submerged macrophytes (SM). On the contrary, TP content was much higher in EM and FM species. There was a negative correlation between TP and antioxidant enzyme activities (CAT and APX). The results suggested that EM and FM species rely on phenolics might to adapt to adverse environments (higher herbivores predation pressure and UV radiation intensity), while SM species more rely on antioxidant enzymes possibly due to lower demand for antioxidation and/or lack of light and inorganic C availability for phenolics synthesis. We also found FM species represent highest fitness in term of antioxidant system, which would lead to overgrowth of FM species and littoral zone bogginess during lake eutrophication. Finally, it is necessary to carry out the verification experiment under the control condition in the later stage, especially for the dominant ones in eutrophic lakes, to understand the exact adaptive mechanisms of them.

关键词： macrophytes life forms phenolics antioxidant enzymes eutrophication

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

Reflections on Tools and Methods for Differentiated Assessments of Individual Scientists, Groups of Scientists and Scientific Journals

引用

Journal of Data and Information Science 2019年第3期4卷 1-5页

作者： Ronald Rousseau xiaolin zhang Centre for R&D Monitoring (ECOOM) and Department MSI KU Leuven 3000 Leuven Belgium University of Antwerp Faculty of Social Sciences 2020 Antwerpen Belgium Library and information services ShanghaiTech University Shanghai 201210 China National Science Library Chinese Academy of Sciences Beijing 100190 China Department of Library Information and Archives Management School of Economics and Management University of Chinese Academy of Sciences Beijing 100190 China

Requirements for research assessments There are huge differences in mission, emphasis, inherent capability, and targeted utilization of research among scientific institutions. Hence, when it comes to assessments, a one-size-fits-all approach cannot meet the goal(s) of these assessments. Probably even larger differences exist between individuals, research teams and departments.

关键词： Reflections Tools and Methods Differentiated Assessments of Individual Scientists

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

FDTD Analysis and Application of Sleeve Monopole Antenna

引用

Wuhan University Journal of Natural Sciences 2007年第2期12卷 284-288页

作者： zhang xiaolin GAO Huotao CHEN Cong School of Electronic Information Wuhan University Wuhan 430072 Hubei China

Based on the symmetry of the structure, a two-dimensional finite difference time domain （FDTD） method is used to analyze the sleeve monopole antenna on the infinite perfect conductor ground fed by a coaxial line. The fields in time domain are then turned into frequency domain through the discrete Fourier Transform to compute the surface current distribution and the input impedance of the sleeve monopole antenna. The gain or pattern of the monopole antenna is also computed, employing the combination of the image theory and the near-to-far transformation in frequency domain. All the computed results agree very well with the results of other methods and measured ones, verifying the application of the FDTD method to analyze the sleeve monopole antennas. The voltage standing wave ratio （VSWR） of the sleeve monopole antennas with different heights and radii of the sleeve are checked to study the influence of the sleeve, which indicates that the height and the radius of the sleeve are both important to the impedance bandwidth of the sleeve monopole antennas.

关键词： sleeve monopole antenna FDTD method broadband antenna PML thin-wire approximation

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

First Total Synthesis of the Proposed Structures of Orisuaveolines A and B

引用

Chinese Journal of Chemistry 2013年第1期31卷 123-126页

作者： Jie zhang Shijun Da xiaolin Feng Xiaoyi Chen Jianhui Jiang Ying Li State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering Lanzhou University Lanzhou Gansu 730000 China

First total synthesis of the proposed structures of β-indoloquinazoline alkaloids orisuaveolines A and B is re- ported. The key steps of the synthesis included a Pictet-Spengler reaction to build a six-member lactam which fur- ther transformed into target molecular by a one-pot condensation. This synthesis provided an access to the proposed structures of orisuaveolines A and B in a short and convenient manner from inexpensive, commercially available starting materials. The structures of our synthesized products were confirmed by 2D-NMR experiments.

关键词： orisuaveolines A and B indoloquinazoline alkaloids Pictet-Spengler reaction one-pot condensation

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

The phase separation of SGS3 regulates antiviral immunity and fertility in Arabidopsis

引用

Science China(Life Sciences) 2023年第8期66卷 1938-1941页

作者： Yujie Han xiaolin zhang Ran Du Xiaoyi Shan Daoxin Xie MOE Laboratory of Bioinformatics Tsinghua-Peking Center for Life SciencesSchool of Life SciencesTsinghua UniversityBeijing 100084China Peking University-Tsinghua University-National Institute of Biological Sciences Joint Graduate Program School of Life SciencesTsinghua UniversityBeijing 100084China Shenzhen Branch of Guangdong Laboratory for Lingnan Modern Agriculture Genome Analysis Laboratory of the Ministry of AgricultureAgricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhen 518124China

Dear Editor,As a conserved mechanism among eukaryotic organisms,RNA silencing is vital for suppressing gene expression at the transcriptional or posttranscriptional level to regulate multiple biological *** interfering RNAs(si RNAs)generated by Dicer proteins integrate with Argonaute(AGO)to form an RNA-induced silencing complex(RISC),in which RNA/DNA could be degraded/methylated through a sequence-specific manner(Ding et al.,2004).

关键词： immunity separation

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

Fermented soy whey induced changes on intestinal microbiota and metabolic inﬂuence in mice

引用

Food Science and Human Wellness 2022年第1期11卷 41-48页

作者： Wei Han Xuhui Zhuang Qian Liu Bo Sun Haijiang Miao xiaolin zhang Academy of State Administration of Grain Beijing 100037China Beijing Key Laboratory of Bioactive Substances and Functional Foods Beijing Union UniversityBeijing 100191China COFCO Nutrition and Health Institute Beijing 102209China

Soy whey(SW)is generated as process waste while preparing soy protein isolates(SPI),and causing severe environmental ***,its value-added utilization is of prime importance for transforming and upgrading traditional *** study aims to utilize SW as a substrate for the growth of probiotics and produce a SW based *** a series of trials,the effect of the dietary supplementation with this fermented SW(FSW)was analyzed on ICR mice's body weight,metabolites,and intestinal microbiota in 4 *** results showed that,when SW was concentrated 15 times,the count of viable Lactobacillus casei reached 3.4×10^(9) CFU/mL by liquid fermentation method,which was the highest viable cell count among all test *** this FSW,the protein,amino acid,total dietary fibre,soluble dietary fibre,and oligosaccharide were 2.10%,1.63%,0.52%,0.51% and 0.79%,*** to two control group,the total yields of the short chain fatty acids(SCFAs)were significantly improved(75%-125% at average),while the SCFAs structure was also significantly changed(especially acetic acid and butyrate)in the faeces of mice fed ***,FSW dietary addition was associated with the diversity and richness of the intestinal ***,with mice's body weight loss,Firmicutes/Bacteroides ratio reduced accordingly(<1.21),and the abundance of Akkermansia muciniphila was significantly increased(the maximum amount was about 0.013%).In summary,our results indicated that the dietary supplementation of FSW affected mice's intestinal microbiota and metabolism and improved their health profile.

关键词： Soy whey Microbiota Short chain fatty acids Lactobacillus casei Akkermansia muciniphila

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

Monetary Policy,Liquidity and Bank Risk-Taking

引用

Frontiers of Economics in China-Selected Publications from Chinese Universities 2023年第2期18卷 171-197页

作者： JIANG Hai zhang xiaolin TANG Shenfeng CHEN Chuanglian College of Economics Jinan UniversityGuangzhou 510632China School of Economics and Finance South China University of TechnologyGuangzhou 510006China Bank of Dongguan Co.Ltd. Dongguan 523000China

The great impact of monetary policy on bank risk-taking,facilitated by a liquidity mechanism,significantly complicates the macro-prudential supervision ***,limited scholarly research has delved into this particular ***,in this paper,the liquidity variable is introduced into the dynamic linear model to depict the liquidity mechanism by which monetary policy affects bank *** on micro-data from 133 commercial banks in China,this paper empirically tests using systematic Gaussian mixture models estimation and a panel smooth transition regression *** findings reveal that while monetary policy does not exhibit a significant risk-shifting effect.A marked liquidity transmission effect,however,is observed,whereby easy monetary policy noticeably exacerbates bank *** impact becomes more pronounced as liquidity levels *** most significant negative impact of monetary policy on bank risk-taking occurs when bank liquidity reaches approximately 43%.Moreover,when banks maintain high levels of liquidity,the statutory deposit reserve ratio exerts a greater regulatory effect than other monetary policy *** monetary policy imposes noticeably weaker restraints than expansionary monetary policy,particularly in banks with higher liquidity ***,the interplay between monetary policy and bank risk-taking is contingent upon not just the liquidity level of banks,but also their asset size and capital adequacy.

关键词： monetary policy liquidity mechanism bank risk-taking

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

Fabrication and laser output of transparent Nd:YAG ceramics from microwave synthesized precursors

引用

Rare Metals 2011年第6期30卷 607-615页

作者： zhang xiaolin LIU Duo WANGJiyang YU Haohai QIN Haiming SANG Yuanhua LIU Hong State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China

We report the laser output of transparent Nd：YAG （Nd：Y3Al5O12） ceramics fabricated from Nd：YAG precursors through the microwave-assisted homogenous precipitation （MAHP） method. Pure phase and uniform Nd：YAG nano-powders with average sizes less than 100 nm were obtained by heating treatment *** Nd：YAG precursor particles aged for 6 d in vessel with humidity of 30%-50% at 25℃. Transparent Nd：YAG ceramic pellets were obtained by vacuum sintering at 1730℃ for 10 h. Laser output （305 roW） with a slope efficiency of 5.1% was realized through an end-pumped configuration. Our results indicate that the MAHP method could potentially be used for the fabrication of laser ceramic products,

关键词： precipitation Nd:YAG transparent ceramics laser output

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：