检索结果-南通市图书馆

Contributions of natural systems and human activity to greenhouse gas emissions

Advances in Climate Change Research 2018年第4期9卷 243-252页

作者： yue xi-Liu GAO Qing-xian China Reinsurance (Group) Corporation Post-doctoral Workstation Beijing 100033 China Beijing Normal University Beijing 100875 China Chinese Research Academy of Environmental Sciences Beijing 100012 China

In this study, we conducted a literature review of relevant research and then statistically analyzed global greenhouse gas (GHG) emissions from natural systems, including forest fires, oceans, wetlands, permafrost, mud volcanoes, volcanoes, and earthquakes. Drawing on the Global Carbon Project (GCP) report, we also summarized the global anthropogenic GHG emissions. We then compared the global annual GHG emissions from natural systems with those generated by human activity. The results indicate that the global annual GHG emissions range approximately between 54.33 and 75.50 Gt CO2-eq, of which natural emissions account for 18.13e39.30 Gt CO2-eq, with the most likely value being approximately 29.07 Gt CO2-eq. According to the GCP report, the global anthropogenic emissions have increased from 22 Gt CO2-eq in 1990 to 36.2 Gt CO2-eq in 2016. The amounts of natural and anthropogenic GHGs emissions are roughly of the same order of magnitude. Anthropogenic emissions account for approximately 55.46% of the total global GHGs emissions (2016 value), i.e., the ratio of natural to anthropogenic emissions is approximately 0.8. In addition, the annual amount of GHGs absorbed by Earth systems (ocean and terrestrial ecosystems) ranges between approximately 14.4 Gt CO2-eq and 26.5 Gt CO2-eq, with natural system GHG emissions and sinks also having roughly the same order of magnitude. This finding indicates that the GHG emissions generated by human activity exert extra pressure on what is otherwise a self-balancing Earth system.

关键词： Greenhouse gases Natural emission Anthropogenic emission Global emission Natural system

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

On the Monotonicity of the Speed of Random Walks on a Percolation Cluster of Trees

引用

Acta Mathematica Sinica,English Series 2007年第11期23卷 1949-1954页

作者： Da yue CHEN Fu xi ZHANG LMAM School of Mathematical Sciences Peking University Beijing 100871 P. R. China

The authors consider the simple random walk on the infinite cluster of the Bernoulli bond percolation of trees, and investigate the relation between the speed of the simple random walk and the retaining probability p ... 详细信息

关键词： random walk percolation speed monotonicity tree

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

Therapeutic potentials of fasudil in liver fibrosis

引用

World Journal of Gastroenterology 2021年第45期27卷 7859-7861页

作者： yue xi Peng-Fei Xu Center for Pharmacogenetics and Department of Pharmaceutical Sciences University of PittsburghPittsburghPA 15261United States

Fasudil has the potential to prevent liver fibrosis by activating natural killer cells and inhibiting the proliferation of hepatic stellate *** may be a promising clinical therapeutic drug for the prevention and treat... 详细信息

关键词： Fasudil Liver fibrosis Natural killer cell Hepatic stellate cell Clinical therapeutic drug

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

Diabetes and gut microbiota

引用

World Journal of Diabetes 2021年第10期12卷 1693-1703页

作者： yue xi Peng-Fei Xu Center for Pharmacogenetics and Department of Pharmaceutical Sciences University of PittsburghPittsburghPA 15261USA Key Laboratory for Cell Proliferation and Regulation Biology of State Education Ministry College of Life SciencesBeijing Normal UniversityBeijing 100875China

The prevalence of diabetes has increased rapidly throughout the world in recent ***,approximately 463 million people are living with diabetes,and the number has tripled over the last two ***,we describe the global epidemiology of diabetes in 2019 and forecast the trends to 2030 and 2045 in China,India,USA,and the *** gut microbiota plays a major role in metabolic diseases,especially *** this review,we describe the interaction between diabetes and gut microbiota in three aspects:probiotics,antidiabetic medication,and *** findings indicate that probiotics,antidiabetic medications,or dietary interventions treat diabetes by shifting the gut microbiome,particularly by raising beneficial bacteria and reducing harmful *** conclude that targeting the gut microbiota is becoming a novel therapeutic strategy for diabetes.

关键词： Diabetes Gut microbiota Epidemiology Probiotics Anti-diabetic medication Diet

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

Dynamics analysis of chaotic maps: From perspective on parameter estimation by meta-heuristic algorithm

引用

Chinese Physics B 2020年第3期29卷 112-118页

作者： yue-xi Peng Ke-Hui Sun Shao-Bo He School of Physics and Electronics Central South UniversityChangsha 410083China

Chaotic encryption is one of hot topics in cryptography, which has received increasing attention. Among many encryption methods, chaotic map is employed as an important source of pseudo-random numbers(PRNS). Although the randomness and the butterfly effect of chaotic map make the generated sequence look very confused, its essence is still the deterministic behavior generated by a set of deterministic parameters. Therefore, the unceasing improved parameter estimation technology becomes one of potential threats for chaotic encryption, enhancing the attacking effect of the deciphering methods. In this paper, for better analyzing the cryptography, we focus on investigating the condition of chaotic maps to resist parameter estimation. An improved particle swarm optimization(IPSO) algorithm is introduced as the estimation method. Furthermore, a new piecewise principle is proposed for increasing estimation precision. Detailed experimental results demonstrate the effectiveness of the new estimation principle, and some new requirements are summarized for a secure chaotic encryption system.

关键词： parameter estimation chaotic map particle swarm optimization chaotic encryption

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

Correlation Combination Ambiguity Removing Technology for Acquisition of Sine-Phased BOC(kn,n) Signals

引用

China Communications 2015年第4期12卷 86-96页

作者： LIU Wen xi yue DENG Zhongliang JIAO Jichao YIN Lu Laboratory of Intelligent Communication Navigation and Micro/Nano-SystemsBeijing University of Posts and Telecommunications

Binary Offset Carrier(BOC) has been chosen as one of modulation methods in the future Global Navigation Satellite Systems(GNSS). Even though BOC signals can bring several advantages such as better track performance and higher positioning accuracy, there is a drawback that the autocorrelation functions have multiple side-peaks if BOC modulation is adopted. This characteristic will lead to false acquisition and the tracking loop will be locked in false phase point. The proposed Correlation Combination Ambiguity Removing Technology(CCART) cancelled all the side-peaks of the sine-phased BOC(kn,n) signals completely by making use of two kinds of correlation functions. Two kinds of sub-correlation functions were combined separately and then final correlation function without side-peaks was acquired. The simulation results are given and compared with other techniques. It is shown that acquisition will not be degraded with the increase of k.

关键词： GNSS unambiguous acquisition,sine-phased BOC(kn,n) combination ofcorrelation functions

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

Improving Sensitivity of Enzyme to Organophosphorous Compounds by Combining Experiment and Theory Methods

引用

Chemical Research in Chinese Universities 2012年第4期28卷 707-711页

作者： WANG yue-xi WANG Ye HAN Wei-wei FENG Yan Key Laboratory for Molecular Enzymology and Engineering Ministry of EducationJilin UniversityChangchun 130012P.R.China State Key Laboratory of Microbial Metabolism College of Life Science and BiotechnologyShanghai Jiaotong UniversityShanghai 200240P.R.China

In this paper,we compared the sensitivities of AFEST（a thermophilic esterase from the archaea Archaeoglobus fulgidus） and acetylcholinesterase（AChE） towards five organophosphorus compounds（OPs） by means of molecular docking,and found that only the docking energy between AFEST and dichlorvos is lower than that between AChE and *** the docking model of AFEST and dichlorvos,Arg43 was found to play an important role in the interaction between AFEST and dichlorvos by means of stabilizing the *** mutant R43S was constructed,the IC 50（the concentration required to reduce virus-induced cytopathicity by 50% is estimated as 50% inhibitory concentration） of which to dichlorvos was lower than that of the wild type AFEST by a factor of 1.56,indicating the enhanced sensitivity of mutant R43S to *** of theory with experiment,we have obtained important structure-function information of AFEST,which will be helpful to the further studies of esterase.

关键词： Organophosphorus compound Thermophilic esterase Docking Mutagenesis Inhibition

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

Resistance Exercise Increases the Regulation of Skeletal Muscle FSTL1 Consequently Improving Cardiac Angiogenesis in Rats with Myocardial Infarctions

引用

Journal of Science in Sport and Exercise 2019年第1期1卷 78-87页

作者： yue xi Meili Hao Zhenjun Tian Institute of Sports and Exercise Biology School of Physical EducationShaanxi Normal UniversityNo.620West Chang’an AvenueChang’an DistrictXi’an 710119ShaanxiChina

Purpose The aim of this study was to investigate whether skeletal muscle-derived follistatin-like 1(FSTL1)reaches the heart and exerts the angiogenetic function in rats suffering myocardial infarctions(MI)after exercise *** Forty-eight male adult Sprague-Dawley rats were randomly divided into four *** was provoked by ligation of left anterior descending coronary *** rats underwent adeno-associated virus injection of FST1 in tibialis anterior muscle and 4 weeks of resistance exercise via a tail-suspended incremental weight-climbing method(0-75%body weight,daily load increased by 10%;1 h/day,5 day/w).Heart function was evaluated by hemodynamics including LVSP,LVEDP and±dP/dt max;the cross-sectional area of muscle cells and myocardium fibrosis were analyzed by DiI and Masson’s stain-ing,respectively;the FSTL1 expression,endothelial cell proliferation and angiogenesis were visualized by immunofluores-cence staining;and protein expression was quantified by Western *** Resistance exercise reverted MI-induced skeletal muscle atrophy,increased muscle FSTL1 expression and stimulated skeletal muscle derived FSTL1 entering into the MI heart via blood *** overexpression of skeletal muscle FSTL1 improved myocardial endothelial cell proliferation,increased small vessel density in the fibrotic border,inhibited myocardial fibrosis and improved heart function in the MI rats after the exercise ***,DIP2A-PI3K-Akt-mTOR,Erk1/2 and TGFβ-Smad2/3 pathways were activated in the *** Resistance exercise stimulates skeletal muscle derived FSTL1 to reach the myocardium which makes a positive contribution to cardioprotection in MI rat.

关键词： Myocardial infarction Resistance exercise FSTL1 Skeletal muscle Angiogenesis

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 role of exercise in rehabilitation of discharged COVID-19 patients

引用

Sports Medicine and Health Science 2021年第4期3卷 194-201页

作者： Wenyan Bo yue xi Zhenjun Tian Institute of Sports and Exercise Biology School of Physical EducationShaanxi Normal UniversityXi'an710119China

Severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)mainly caused pneumonia and pulmonary fibrosis through upper respiratory tract infection,which resulted in acute respiratory distress syndrome(ARDS)and multiorgan damage of cardiovascular,nervous,digestive,and genitourinary *** the virus test turned negative after the patient recovered,the damage to multiorgan caused by SARS-CoV-2 may ***,the health status of the recovered patients has gradually become the focus of people's *** coronavirus disease 2019(COVID-19)patients can receive exercise rehabilitation training after discharge?and what's the basis?We try to analyze and answer these questions,will provide some ideas about the patients to develop a reasonable and effective exercise rehabilitation program.

关键词： SARS-CoV-2 COVID-19 Exercise rehabilitation Inflammation cytokine storm Exercise response factor

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 Properties of Hydroxide Conductive Polymers Carrying Dense Aromatic Side-chain Quaternary Ammonium Groups

引用

Chinese Journal of Polymer Science 2017年第7期35卷 823-836页

作者： Guang-hui Nie Wen-Jun Wu xi yue Shi-jun Liao 李秀华 School of Chemistry&Chemical Engineering South China University of TechnologyGuangzhou 510641China The Key Laboratory of Fuel Cell Technology of Guangdong Province South China University of TechnologyGuangzhou 510641China

A series of hydroxide conductive polymers QTBMs carrying dense aromatic side-chain quaternary ammonium groups has been synthesized by using a new monomer of 3,3＇-di（3＂,5＂-dimethylphenyl）-4,4＇-difluorodiphenyl sulfone and other commercial monomers via polycondensation reaction, and subsequent bromination, quaternization and alkalization. The chemical structures of the ionomers were confirmed by 1H- and 13C-NMR spectroscopy. Water uptake, swelling ratio, hydroxide conductivity, the number of bonded water per ammonium group （A）, volumetric ion exchange capacity （IECvwet）, mechanical and thermal properties, and chemical stability were systematically evaluated for the series of QTBMs membranes. QTBMs showed IECs ranging from 1.02 meq·g-1 to 2.11 meq·g-1; in particular, QTBM-60 membrane with the highest IEC （2.11 meq·g-1） had very high hydroxide ion conductivity of 131.9 mS·cm-1 at 80 ℃, which was attributed to the well assembled nano-channels with distinct phase separation evidenced by small-angle X-ray scattering （SAXS）. It was found that the hydrated QTBMs membranes were mechanically stable with moderate water uptakes and swelling ratios, high chemical stability under the harsh alkaline conditions. This work provides a facile way to prepare anion exchange membranes （AEMs） with high performances for the application in alkaline fuel cells.

关键词： Aromatic side-chain quaternary ammonium Bromination Alkaline anion exchange membrane Poly(aryleneether sulfone)s

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：