检索结果-南通市图书馆

Eliminating mother-to-child transmission of HBV:progress and challenges in China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Medicine 2020年第1期14卷 21-29页

作者： Wenzhan Jing Jue liu min liu Department of Epidemiology and Biostatistics School of Public HealthPeking UniversityBeijing 100191China

China has the world’s largest burden of hepatitis B virus(HBV)infection,but the country has made considerable progress in preventing its mother-to-child transmission(MTCT)in the past three *** feat is made possible due to the high coverage of birth-dose hepatitis B vaccine(HepB,>95%),hepatitis B surface antigen(HBsAg)screening for pregnant women(>99%),and hepatitis B immunoglobulin plus HepB for newborns whose mothers are HBsAg positive(>99%).Studies on the optimal antiviral treatment regimen for pregnant women with high HBV-DNA load have also been ***,China still faces challenges in eliminating MTCTof *** overall HBsAg prevalence among pregnant women is considered an intermediate *** prevalence of HBsAg among pregnant women from remote,rural,or ethnic minority areas is higher than that of the national level because of limited health resources and public health education for *** coverage for maternal and child healthcare and immunization services should be improved,especially in western *** of current services to prevent MTCTof HBV with other relevant health services can increase the acceptability,efficiency,and coverage of these services,particularly in remote areas and ethnic minority *** doing so,progress toward key milestones and targets to eliminate hepatitis B as the main public health threat by 2030 can be achieved.

关键词： hepatitis B virus mother-to-child transmission progress challenge

The role of all-trans retinoic acid in the biology of Foxp3＋ regulatory T cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2015年第5期12卷 553-557页

作者： Zhong-min liu Research Center for Translational Medicine East Hospital Tongji University School of Medicine Shanghai China Division of Rheumatology Penn State Hershey College of Medicine Hershey PA USA Division of Liver Surgery First Affiliated Hospital of Nanjing Medical University Nanjing China Division of Rheumatology Immunology and Nephrology Zhejiang Provincial Traditional Chinese Medicine and Western Medicine Hospital Hangzhou China These authors contributed equally.

Regulatory T （Treg） cells are necessary for immune system homeostasis and the prevention of autoimmune diseases. Foxp3 is specifically expressed in Treg cells and plays a key role in their differentiation and function. Foxp3＋ Treg cells are consisted of naturally occurring, thymus-derived Treg （nTreg） and peripheral-induced Treg （iTreg） cells that may have different functional characteristics or synergistic roles. AII-trans retinoic acid （atRA）, a vitamin A metabolite, regulates a wide range of biological processes, including cell differentiation and proliferation. Recent studies demonstrated that atRA also regulates the differentiation of T helper （Th） cells and Treg cells. Moreover, atRA also sustains nTreg stability under inflammatory conditions. In this review, we summarize the significant progress of our understanding of the role（s） and mechanisms of atRA in Treg biology.

关键词： atRA autoimmune diseases Foxp3 Treg cells

Preparation and catalytic activity of CO-resistant catalyst core-shell Au@Pt/C for methanol oxidation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2012年第5期31卷 451-456页

作者： FENG Rongjuan LI min liu Jiaxiang College of Materials Science and Engineering Laboratory of Electrochemical Process and Technology for Materials Beijing University of Chemical Technology Beijing 100029 China

Au@Pt core-shell nanoparticles were successfully synthesized by a successive reduction method and then assembled on Vulcan XC-72 carbon surface. Furthermore, its composition, morphology, structure, and activity towards methanol oxidation were characterized by UV-vis spectrometry, transmission electron microscopy (TEM), high-resolution TEM (HRTEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and cyclic voltammetry (CV). Results reveal that Au@Pt/C catalyst has better activity towards methanol oxidation than the pure platinum prepared under the same conditions. When the atomic ratio of Au to Pt in the prepared Au@Pt/C catalyst is 1:2, this catalyst exhibits best electrocatalytic activity towards methanol oxidation in acidic media, and the peak current density on this catalyst is ~2.0 times higher than that on Pt/C catalyst. The better catalytic activity of Au@Pt/C results from its better resistance to toxic CO than Pt/C because the CO oxidation on Au@Pt/C is 60 mV more negative than the case on Pt/C. © The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg 2012.

关键词： Carbon Cobalt Cyclic voltammetry Electrocatalysts Gold Methanol Nanoparticles Oxidation Photoelectrons Platinum Platinum alloys Synthesis (chemical) Transmission electron microscopy X ray diffraction X ray photoelectron spectroscopy

An Efficient Variational Model for Multiplicative Noise Removal

在线全文

学校读者我要写书评

暂无评论

Numerical Mathematics(Theory,Methods and Applications) 2022年第1期15卷 125-140页

作者： min liu Xiliang Lu School of Mathematics and Statistics Wuhan UniversityWuhan 430072China Hubei Key Laboratory of Computational Science Wuhan UniversityWuhan 430072China

In this paper,an efficient variational model for multiplicative noise removal is *** using a MAP estimator,Aubert and Aujol[SIAM ***.,68(2008),pp.925-946]derived a nonconvex cost *** logarithmic transformation,we transform the image into a logarithmic domain which makes the fidelity convex in the transform *** the TV regularization term in logarithmic domain may cause oversmoothness numerically,we propose the TV regularization directly in the original image domain,which preserves more details of *** alternative minimization algorithm is applied to solve the optimization *** z-subproblem can be solved by a closed formula,which makes the method very *** convergence of the algorithm is *** numerical experiments show the efficiency of the proposed model and algorithm.

关键词： Multiplicative noise variational model alternating direction minimization

Cartesian Closed Categories of F Z-domains

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2013年第12期29卷 2373-2390页

作者： min liu Bin ZHAO Department of Mathematics Shaanxi Normal University

A subset system Z assigns to each partially ordered set P a certain collection Z（P） of subsets. In this paper, a new kind of subset systems called directable subset systems is introduced. For a directable subset system Z, the concepts of FZ-way-below relation and FZ-domain are introduced. The well-known Scott topology is naturally generalized to the Z-level and the resulting topology is called FZ-Scott topology, and the continuous functions with respect to this topology are characterized by preserving the suprema of directed Z-sets. Then, we mainly consider a generalization of the cartesian closedness of the categories DCPO of directed complete posets, BF of bifinite domains and FS of FS-domains to the Z-level. Corresponding to them, it is proved that, for a suitable subset system Z, the categories FZCPO of Z-complete posets, FSFZ of finitely separated FZ-domains and BFFZ of bifinite FZ-domains are all cartesian closed. Some examples of these categories are given.

关键词： Subset system directable subset system FZ-way-below relation FZ-domain FZ-Scott topology FZ-Scott continuous function cartesian closed category

Algebras with compatible quantale-enriched structures

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2014年第11期57卷 176-185页

作者： ZHAO Bin liu min College of Mathematics and Information Science Shaanxi Normal University

Based on quantale-enriched category, we consider algebras with compatible quantale-enriched structures, which can be viewed as fuzzification of ordered algebraic structures. We mainly study groupoids and semigroups with compatible quantale-enriched structures from this viewpoint. Some basic concepts such as ideals,homomorphisms, residuated quantale-enriched groupoids are developed and some examples of them are *** approach gives a complement to the approach initiated by Rosenfeld to study fuzzy abstract algebra, and these two approaches are combined in the present paper to study fuzzy aspects of abstract algebra structures.

关键词： algebra category theory ordered algebraic structure quantale enriched category fuzzy equality

Simultaneous Prediction for Multiple Key Performance Indicators in Semiconductor Wafer Fabrication

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2016年第6期25卷 1159-1165页

作者： CAO Zhengcai liu Xuelian HAO Jinghua liu min College of Information Science and Technology Beijing University of Chemical Technology Key Laboratory of Symbolic Computation and Knowledge Engineering of ministry of Education Jilin University Department of Automation Tsinghua University

The prediction and key factors identification for lot Cycle time(CT) and Equipment utilization(EU) which remain the Key performance indicators(KPI)are vital for multi-objective optimization in semiconductor manufacturing industry. This paper proposes a prediction methodology which predicts CT and EU simultaneously and identifies their key factors. Bayesian neural network(BNN) is used to establish the simultaneous prediction model for Multiple key performance indicators(MKPI),and Bayes theorem is key solution in model complexity controlling. The closed-loop structure is built to keep the stability of MKPI prediction model and the weight analysis method is the basis of identifying the key factors for CT and EU. Compared with Artificial neural network(ANN)and Selective naive Bayesian classifier(SNBC), the simulation results of the prediction method of BNN are proved to be more feasible and effective. The prediction accuracy of BNN has been obviously improved than ANN and SNBC.

关键词： Prediction for MKPI Cycle time Equipment utilization BNN Key factors identification

Research and Development Trend of Shape Control for Cold Rolling Strip

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2017年第5期30卷 1248-1261页

作者： Dong-Cheng Wang Hong-min liu Jun liu National Engineering Research Center for Equipment and Technology of Cold Rolling Strip Yanshan University State Key Laboratory of Metastable Materials Science and Technology Yanshan University Anshan Iron and Steel Co.Ltd

Shape is an important quality index of cold rolling strip. Up to now, many problems in the shape control domain have not been solved satisfactorily, and a review on the research progress in the shape control domain can help to seek new breakthrough directions. In the past 10 years, researches and applications of shape control models, shape control means, shape detection technology, and shape con- trol system have achieved significant progress. In the aspect of shape control models, the researches in the past improve the accuracy, speed and robustness of the models. The intelligentization of shape control models should be strengthened in the future. In the aspect of the shape control means, the researches in the past focus on the roll opti- mization, mill type selection, process optimization, local strip shape control, edge drop control, and so on. In the future, more attention should be paid to the coordination control of both strip shape and other quality indexes, and the refinement of control objective should be strengthened. In the aspects of shape detection technology and shape control system, some new types of shape detection meters and shape control systems are developed and have successfully indus- trial applications. In the future, the standardization of shape detection technology and shape control system should be promoted to solve the problem of compatibility. In general,the four expected development trends of shape control for cold roiling strip in the future are intelligentization, coordi- nation, refinement, and standardization. The proposed research provides new breakthrough directions for improv- ing shape quality.

关键词： Cold rolling strip - Shape control Development trend Theory models Shape detectionControl system

The Unsteady Fluctuating Pressure and Velocity in a Cross Flow Fan

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2008年第4期17卷 349-355页

作者： Jiaye Gan Fei liu min liu Keqi Wu State Key Laboratory of Coal Combustion Huazhong University of Science and Technology Wuhan 430074 Chinaganjiaye0775 @ ***

This paper investigates the relations between the fluctuating pressure and velocity of the source by means of nu- merical method and sound pressure in the far field obtained with an noise experiment for a novel cross flow fan. The frequency characteristics of the fluctuating pressure and velocity in a cross flow fan are analyzed by means of spectral analysis and wavelet transform. The fluctuating pressures obtained by large eddy simulation on the casing wall are compared with that of experiments and show good agreement. From the spectral analysis of sound source, it is found that the pressure fluctuating peak is correspond with the sound pressure in the far field.

关键词： cross flow fan spectral analysis aerodynamic noise