检索结果-南通市图书馆

Load dependent microstructural evolution in an as-cast 26%Cr high chromium cast iron during unlubricated sliding

Friction 2022年第8期10卷 1258-1275页

作者： U.Pranav NAYAK Sebastian SUÁREZ Valentin PESNEL Frank mÜCKLICH maría Agustina GUITAR Department of materials Science Saarland UniversitySaarbrücken 66123Germany materials Engineering Center Saarland Saarbrücken 66123Germany Ecole Européenne d’ingénieurs en Génie des matériaux Universitéde LorraineNancy 54000France

In the current study,an as-cast 26%Cr high chromium cast iron(HCCI)alloy was subjected to dry-sliding linear wear tests,under different *** loads were selected based on analytically computing the critical load(PC)i.e.,the load necessary to induce plastic *** PC was calculated to be 15 N and accordingly,a sub-critical load(5 N)and an over-critical load(20 N)were *** influence of increasing the load during the wear test was investigated in terms of the matrix microstructural behaviour and its ability to support the surrounding *** morphological aspects of the wear tracks,and the deformed matrix microstructure adjacent and underneath the track was analysed by confocal laser scanning microscope(CLSm)and scanning electron microscope(SEm),*** evidence of plastic deformation of the matrix was observed below *** the contrary,at loads equal to and higher than PC,the austenitic matrix plastically deformed as evidenced by the presence of slip *** backscattered diffraction(EBSD)measurements in terms of grain reference orientation deviation,and micro-Vickers hardness of the austenitic matrix indicated a deformation depth of about 40μm at the maximum applied load of 20 *** active wear mechanisms during sliding were a combination of both adhesive and abrasive wear,although increasing the load shifted the dominant mechanism towards *** was primarily attributable to the increased propensity for carbide cracking and fracturing,combined with the inability of the hardened austenitic matrix surface and sub-surface to adequately support the broken carbide ***,the shift in the dominant wear mechanism was also reflected in the wear volume and subsequently,the wear rate.

关键词： high chromium cast iron unlubricated sliding plastic deformation wear resistance carbide spallation matrix hardness

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

Polyurethanes from Kraft Lignin without Using Isocyanates

引用

Journal of Renewable materials 2018年第4期6卷 413-425页

作者： F.J.Santiago-medina m.C.Basso A.Pizzi L.Delmotte LERmAB University of Lorraine27 rue Philippe Seguin88000 EpinalFrance Department of Physics King Abdulaziz UniversityJeddahSaudi Arabia material Science Institute of mulhouse UMR CNRS 7361University of Upper Alsace15 rue Jean StarckyBP 248868057 Mulhouse CedexFrance

The reaction of a desulphurized kraft lignin with hexamethylene diamine and dimethyl carbonate has allowed the development of isocyanate-free polyurethane *** present research work is based on previous studies made with hydrolyzable and condensed tannins,but takes advantage of the higher number of hydroxyl groups present in lignin and their different aliphatic and aromatic *** obtained materials were analyzed by Fourier transform infrared(FTIR)spectroscopy,matrix-assisted laser desorption ionization time-of-flight(mALDI-TOF)mass spectrometry and solid-state cross-polarization/magic angle spinning(CP mAS)13C nuclear magnetic resonance(NmR),which have revealed the presence of urethane *** interpretation of the results has shown a larger number of species than when tannins were used and has indicated the presence of two types of bonds in the new molecules formed:ionic and covalent bonds.

关键词： Lignin urethanes non-isocyanate polyurethanes mALDI-TOF FTIR

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

Global prevalence of hepatitis B virus serological markers among healthcare workers:A systematic review and meta-analysis

引用

World Journal of Hepatology 2021年第9期13卷 1190-1202页

作者： Gadji mahamat Sebastien Kenmoe Etheline W Akazong Jean Thierry Ebogo-Belobo Donatien Serge mbaga Arnol Bowo-Ngandji Joseph Rodrigue Foe-Essomba marie Amougou-Atsama Chavely Gwladys monamele Chris Andre mbongue mikangue Ginette Irma Kame-Ngasse Jeannette Nina magoudjou-Pekam Cromwel Zemnou-Tepap Dowbiss meta-Djomsi martin maidadi-Foudi Sabine Aimee Touangnou-Chamda Audrey Gaelle Daha-Tchoffo Abdel Aziz Selly-Ngaloumo Rachel Audrey Nayang-mundo Jacqueline Felicite Yengue Jean Bosco Taya-Fokou lorraine K m Fokou Raoul Kenfack-momo Dimitri Tchami Ngongang Efietngab Atembeh Noura Herve Raoul Tazokong Cynthia Paola Demeni Emoh Cyprien Kengne-Nde Jean Joel Bigna Onana Boyomo Richard Njouom Department of microbiology The University of Yaounde IYaounde 00237Cameroon Department Centre Pasteur of CameroonYaounde 00237Cameroon Department of Biochemistry University of DschangDschang 00237Cameroon medical Research Centre Institute of Medical Research and Medicinal Plants StudiesYaounde 00237Cameroon Department of mycobacteriology Centre Pasteur of CameroonYaounde 00237Cameroon Centre de Recherche sur les maladies Emergentes et Re-Emergentes Institut de Recherches Medicales et d'Etudes des Plantes MedicinalesYaounde 00237Cameroon Department of Biochemistry The University of Yaounde IYaounde 00237Cameroon Department of medical Biochemistry The University of Yaounde IYaounde 00237Cameroon Department of microbiology Protestant University of Central AfricaYaounde 00237Cameroon Department of Animals Biology and Physiology The University of Yaounde IYaounde 00237Cameroon Evaluation and Research Unit National AIDS Control CommitteeYaounde 00237Cameroon Department of Epidemiology and Public Health Centre Pasteur of CameroonYaounde 00237Cameroon

BACKGROUND The hepatitis B virus(HBV)infection is a global public health concern that affects about 2 billion people and causes 1 million people deaths *** is a bloodborne disease and healthcare workers(HCWs)are a high-risk group because of occupational hazard to patients’*** regions of the world show a highly variable proportion of HCWs infected and/or immunized against *** data on serologic markers of HBV infection and immunization in HCWs are very important to improve strategies for HBV *** To determine the worldwide prevalence of HBV serological markers among *** In this systematic review and meta–analyses,we searched Pubmed and Excerpta medica Database(Embase)to identify studies published between 1970 and 2019 on the prevalence of HBV serological markers in HCWs *** also manually searched for references of relevant *** independent investigators selected studies and included those on the prevalence of each of the HBV serological markers including hepatitis B surface antigen(HBsAg),hepatitis e antigen(HBeAg),immunoglobulin m anti-HBc,and *** quality of eligible studies was assessed and random-effect model meta-analysis resulted in the pooled prevalence of HBV serological markers HBV infection in ***(I²)was assessed using theχ²test on Cochran’s Q statistic and H ***’sources were explored through subgroup and metaregression *** study is registered with PROSPERO,number *** We reviewed 14059 references,out of which 227 studies corresponding to 448 prevalence data among HCWs(224936 HCWs recruited from 1964 to 2019 in 71 countries)were included in this *** pooled seroprevalences of current HBsAg,current HBeAg,and acute HBV infection among HCWs were 2.3%[95% confidence interval(CI):1.9-2.7],0.2%(95%CI:0.0-1.7),and 5.3%(95%CI:1.4-11.2),*** pooled seroprevalences of total immunity against HBV and immu

关键词： Healthcare workers Hepatitis B virus Seroprevalence Hepatitis B surface antigen Hepatitis e antigen

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

A Comparative Study of Different Drying Processes for a Deformable Saturated Porous medium

引用

Fluid Dynamics & materials Processing 2023年第6期19卷 1339-1348页

作者： Nour El Houda Ben mustaphaa Ibtissem Boumnijel m.El-Ganaoui Daoued mihoubi Laboratory of Wind Energy management and Waste Energy Recovery Research and Technology Center of EnergyHammam-LifTunisia Laboratory of Studies and Research on Wood material(LERmAB) University of LorraineLongwyFrance National Engineering School of monastir University of MonastirMonastirTunisia

Drying of a deformable saturated porous medium based on convective tempering is a novel method that can enhance energy efficiency and the quality of the dried product *** this experimental investigation,the performances of this specific technique are compared with those of a standard stationary drying process in terms of deformation,drying kinetics,moisture redistribution,and energy *** particular,the response of a deformable saturated porous medium(Kaolin)is *** results are critically discussed pointing out advantages and drawbacks.

关键词： Convective drying tempering convective drying energy consumption Kaolin

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

Soil Contamination due to E-Waste Disposal and Recycling Activities: A Review with Special Focus on China

引用

Pedosphere 2012年第4期22卷 470-488页

作者： G. ECHEVARRIA T. STERCKEmAN m. O. SImONNOT J. L. mOREL INPL(ENSAIA)/INRA Laboratoire Sols et Environnement 2 Avenue de la For et de Haye BP 172 54505 Vandoeuvre-lès-Nancy Cedex (France) Laboratoire Réactions et Génie des Procédés (LRGP) Université de Lorraine-CNRS (UPR 3349) 1 Rue Grandville BP20451 54001 Nancy Cedex (France)

Considering that even contaminated soils are a potential resource for agricultural production, it is essential to develop a set of cropping systems to allow a safe and sustainable agriculture on contaminated lands while avoiding any transfer of toxic trace elements to the food chain. In this review, three main strategies, i.e., phytoexclusion, phytostabilization, and phytoextraction, are proposed to establish cropping systems for production of edible and non-edible plants, and for extraction of elements for industrial use. For safe production of food crops, the selection of low-accumulating plants/cultivars and the application of soil amendments are of vital importance. Phytostabilization using non-food energy and fiber plants can provide additional renewable energy sources and economic benefit with minimum cost of agricultural measures. Phytoextracting trace elements （e.g., As, Cd, Ni, and Zn） using hyperaccumulator species is more suitable for slightly and moderately polluted sites, and phytomining of Ni from serpentine soils has shown a great potential to extract Ni-containing bio-ores of economic interests. We conclude that appropriate combinations of soil types, plant species/cultivars, and agronomic practices can restrict trace metal transfer to the food chain and/or extract energy and metals of industrial use and allow safe agricultural activities.

关键词： agronomic practices food safety hyperaccumulator phytoremediation trace element

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

Navier Slip and Heat Transfer in a Nanofluid Due to a Stretching/Shrinking Sheet:An Analytical Study

引用

Fluid Dynamics & materials Processing 2022年第5期18卷 1551-1567页

作者： A.B.Vishalakshi U.S.mahabaleshwar m.EL.Ganaoui R.Bennacer Department of mathematics ShivagangotriDavangere UniversityDavangere577007India Institut Universitaire de Technologie de Longwy Universitéde Lorraine 186 rue de LorraineCosnes et Romain54400France LmT/ENS-Cachan/CNRS/UniversitéParis Saclay Cachan94235France

This paper is devoted to the analysis of the heat transfer and Navier’s slip effects in a non-Newtonian Jeffrey fluid flowing past a stretching/shrinking *** nanoparticles,namely,Cu and Al_(2)O_(3)are used with a water-based fluid with Prandtl number *** slip flow is assumed to occur when the characteristic size of the flow system is small or the flow pressure is very *** using the similarity transformations,the governing nonlinear PDEs are turned into ordinary differential equations(ODE’s).Analytical results are presented and analyzed for various values of physical parameters:Prandtl number,Radiation parameter,stretching/shrinking parameter and mass transpiration for the flow and heat *** considered problem is relevant to various physical applications in the field of engineering,e.g.,the production of certain materials,the preparation of plastic and rubber sheets and glass *** is shown that the considered nanofluid increases the thermal *** nanoparticles act as a heater by increasing the solid volume fraction and thermal *** versa,they can act as a cooler if the strength of magnetic field is *** flow strength decreases by increasing the values of Deborah number.

关键词： Nanofluid navier’s slip radiation ordinary differential equations

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

Impact of Radiation and Slip on Newtonian Liquid Flow Past a Porous Stretching/Shrinking Sheet in the Presence of Carbon Nanotubes

引用

Fluid Dynamics & materials Processing 2023年第4期19卷 929-939页

作者： U.S.mahabaleshwar T.Anusha m.EL Ganaoui R.Bennacer Department of mathematics Davangere UniversityShivagangothriDavangere577007India Institut universitaire de Technologie de Longwy Universitéde Lorraine186 rue de LorraineCosnes et Romain54400France LmT/ENS-Cachan/CNRS/UniversitéParis Saclay Cachan94235France

The impacts of radiation,mass transpiration,and volume fraction of carbon nanotubes on the flow of a Newtonian fluid past a porous stretching/shrinking sheet are *** this purpose,three types of base liquids are considered,namely,water,ethylene glycol and engine ***,single and multi-wall carbon nanotubes are examined in the *** overall physical problem is modeled using a system of highly nonlinear partial differential equations,which are then converted into highly nonlinear third order ordinary differential equations via a suitable similarity *** equations are solved analytically along with the corresponding boundary *** is found that the carbon nanotubes can significantly improve the heat transfer *** potential application in cutting-edge areas is also discussed to a certain extent.

关键词： Carbon nanotubes porous media newtonian fluid radiation

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

Cadmium sulfide thin films growth by chemical bath deposition

引用

Journal of Semiconductors 2018年第3期39卷 50-56页

作者： S.Hariech m.S.Aida J.Bougdira m.Belmahi G.medjahdi D.Genève N.Attaf H.Rinnert Thin films and Interfaces Laboratory Faculty of Sciences Mentouri University Department of physics Faculty of science King Abdulaziz University Jean Lamour Institute University of Lorraine

Cadmium sulfide（Cd S） thin films have been prepared by a simple technique such as chemical bath deposition（CBD）. A set of samples Cd S were deposited on glass substrates by varying the bath temperature from 55 to 75 °C at fixed deposition time（25 min） in order to investigate the effect of deposition temperature on Cd S films physical properties. The determination of growth activation energy suggests that at low temperature Cd S film growth is governed by the release of Cd^（2＋） ions in the solution. The structural characterization indicated that the Cd S films structure is cubic or hexagonal with preferential orientation along the direction（111） or（002）, respectively. The optical characterization indicated that the films have a fairly high transparency, which varies between55% and 80% in the visible range of the optical spectrum, the refractive index varies from 1.85 to 2.5 and the optical gap value of which can reach 2.2 e V. It can be suggested that these properties make these films perfectly suitable for their use as window film in thin films based solar cells.

关键词： thin films chemical bath cadmium sulfide solar cell

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

Slow Pyrolysis of Sugarcane Bagasse for the Production of Char and the Potential of Its By-Product for Wood Protection

引用

Journal of Renewable materials 2021年第1期9卷 97-117页

作者： Febrina Dellarose Boer Jérémy Valette Jean-michel Commandré mériem Fournier marie-France Thévenon CIRAD UR BioWooEBTA B-114/1673 Rue Jean-François BretonF-34398 MontpellierCedex 5France BioWooEB Universitéde MontpellierCIRADMontpellierFrance AgroParisTech Centre de Nancy Nancy54000France Universitéde lorraine AgroParisTechINRAUMR SilvaNancyF-54000France

Sugarcane bagasse was pyrolyzed using a laboratory fixed bed reactor to produce char and its by-product(pyrolysis liquid).The pyrolysis experiments were carried out using different temperatures(400℃ and 500℃),heating rate(1℃/min and 10℃/min),and holding time(30 min and 60 min).Char was characterized according to its thermal properties,while the pyrolysis liquid was tested for its anti-fungal and anti-termite *** temperature and heating rate had a significant influence on the char properties and the yield of char and pyrolysis liquid,where a high-quality char and high yield of pyrolysis liquid can be obtained at a temperature of 500℃ and a heating rate of 10℃/*** yield of char and pyrolysis liquid was 28.97%and 55.46%,*** principal compounds of pyrolysis liquid were water,acetic acid,glycolaldehyde,1-hydroxy-2-propanone,methanol,formic acid,levoglucosan,furfural,followed by some phenol compounds and guaiacol *** liquid at a concentration of 0.20%and 0.25%(v/v)caused a 100%inhibition of Coniophora puteana and Trametes versicolor,respectively,when performing inhibition growth tests in Petri *** paper treated with 10%of pyrolysis liquid caused 100%of termite mortality,while only 5.65%–7.03%of the treated filter papers consumed by termites at such *** liquid is potentially effective to be used in the formulation of wood protection against fungi and termites.

关键词： Anti-fungal anti-termite biomass char pyrolysis liquid slow pyrolysis sugarcane bagasse valorization

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

发展和评估一项新的X线胸片阅读和记录系统在结核病及肺部疾病流行病学调查中的价值

引用

国际结核病与肺部疾病杂志 2006年第3期1卷 107-114页

作者： S. Den Boon E. D. bateman D. A. Enarson m. W. Borgdorff S. Verver C. J. Lombard E. Irusen N. Beyers N. W. White 马玙（译）杨杭旦（校）张立兴（审） Department of Paediatrics and Child Health Desmond Tutu TB Centre Stellenbosch University Cape Town South Africa Department of Infectious Diseases Tropical Medicine and AIDS Academic Medical Centre Amsterdam KNCV Tuberculosis Foundation The Hague The Netherlands Division of Pulmonology Department of Medicine University of Cape Town Cape Town South Africa International Union Against Tuberculosis and Lung Disease Paris France Biostatistics Unit Medical Research Council Cape Town Department of Internal medicine Stellenbosch University Cape Town South Africa 不详

目的:发展和评估一项新的X线胸片阅读和记录系统(CRRS)在社区结核病及肺部疾病调查中的价值。设计:采用新发展的X线胸片阅读和记录系统(CRRS),一名有经验的肺病专家共阅读了为调查结核病患病率而拍摄的胸片2608张。在2608张X线胸片中,... 详细信息

目的:发展和评估一项新的X线胸片阅读和记录系统(CRRS)在社区结核病及肺部疾病调查中的价值。设计:采用新发展的X线胸片阅读和记录系统(CRRS),一名有经验的肺病专家共阅读了为调查结核病患病率而拍摄的胸片2608张。在2608张X线胸片中,分层随机抽取810张胸片(31％)由第二位阅片者阅读报告。计算两位阅片者间一致性的kappa值(κ)。分层随机抽取104张X线胸片再次阅读和报告,计算同一阅片者两次阅读间一致性的κ值。结果:两阅片者间在符合结核病异常阴影判定的一致性的κ值为0．69(95％CI:0．64-0．74)、任何异常者的一致性的κ值为0．47(95%CI:0．42-0．53)。同一阅片者对符合结核病异常及任何异常的二次判定结果一致率的κ值各为0．90(95％CI:0．81-0．99)及0．85(95％CI:0．74-0．95)．结论:此标准化的X线胸片阅读及记录系统提供了满意的阅片者间及同一阅片者二次阅片间的一致性,适用于在社区进行结核病及其它肺部疾病的调查。还可用于各种不同调查所获结果的比较。

关键词：结核病 X线胸片 kappa统计值双重阅读重复性

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：