检索结果-南通市图书馆

The role of physical properties in explosive welding of copper to stainless steel

Defence Technology（防务技术） 2023年第4期22卷 88-98页

作者： G.H.S.F.L.Carvalho I.Galvao R.Mendes R.M.Leal A.B.Moreira A.Loureiro Univ Coimbra CEMMPREDepartamento de Engenharia Mec^anicaRua Luís Reis Santos3030-788CoimbraPortugal Department of Industrial Engineering University of FirenzeVia di Santa Marta 350139FirenzeItaly ISEL Departamento de Engenharia Mec^anicaInstituto Politecnico de LisboaRua Conselheiro Emídio Navarro 11959-007LisboaPortugal Univ Coimbra ADAILEDAPDepartamento de Engenharia Mec^anicaRua Luís Reis Santos3030-788CoimbraPortugal lida-esad.cr Instituto Politecnico de LeiriaRua Isidoro Inacio Alves de Carvalho2500-321Caldas da RainhaPortugal Univ.Porto LAETA/INEGIDept.Eng.Metalúrgica e de MateriaisR.Dr.Roberto Frias4200-465PortoPortugal

This paper investigates the effects of the physical properties on the microstructure and weldability of explosive welding by joining two metals with a significant contrast in thermophysical properties:stainless steel and *** welds between stainless steel and copper were obtained,and the interfacial morphology was wavy,regardless of the position of the *** weldability of dissimilar pairs was found to be more dependent on the relationship between the physical properties of the base materials than on the absolute value of the material *** there is a significant difference in thermal conductivity between the flyer and the base plate,together with a material with a low melting temperature,the weldability of the pair is often *** relative position of the plates affects the interfacial microstructure even when similar morphologies are *** the metallic pairs studied,the wave size was bigger for the configuration in which the ratio between the density of the flyer and the density of the base plate is *** same phenomenon was observed for the impedance:bigger waves were found for a smaller ratio between the impedance of the flyer and the impedance of the base plate.

关键词： Explosive welding Solid-state Copper-stainless steel Dissimilar Interface morphology Weldability

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

Spectral properties and identification of aerostatic bearings

引用

Acta Mechanica Sinica 2011年第1期27卷 63-67页

作者： Jan Kozánek Ladislav Pust Institute of Thermomechanics AS cr

Modified rotor kit Bently Nevada was used for dynamic characteristics measurements of new developed aerostatic *** model of these bearings is considered as *** was identified with the help of harmonic force excitation independently from the speed of journal *** stiffness and damping matrices were identified for different air inlet *** calculated spectral properties allow to determine the stability boundary for suitable variation of model parameters.

关键词： Aerostatic bearing · Identification · Stiffness · Damping coefficients

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 study of fire propagation in coal seam with numerical simulation of heat transfer and chemical reaction rate in mining field

引用

International Journal of Mining Science and Technology 2019年第6期29卷 873-879页

作者： Moisés Oswaldo Bustamante Rúa Alan José Daza Aragón Pablo Bustamante Baena National University of Colombia Cr 65 # 63 20 CIMEX Minerals Institute

Spontaneous combustion of coal is a problem that affects the mining operation and generates environ-mental,economic,social and geotechnical *** phenomenon has been divided into two pro-cesses:ignition and *** propagation develops in coal seams because of a set of factors such as direction and wind speed,fracturing and *** this work,heat transfer and chemical kinetics are studied from conservation equations of energy and species,respectively,using the software COMSOL Multiphysics to simulate the propagation of fires in coal *** possible scenarios were analyzed that usually occur in the walls of the coal seams,such as fire focus and fire complete *** was found that the propagation kinetics of the fire changes depending on the temperature,the fractur-ing of rock mass and the area of fire *** temperature values lower than 300℃,there is con-sumption around 250 cm^3/h,values around 700℃,the consumption is 1500 cm^3/h,and for fires of 1200℃ have values of 3000 cm^3/*** on the speed of propagation can vary from 4 to 17cm/day,considering on the level and fracturing of the final wall of the open pit.

关键词： Spontaneous combustion of coal Open pit mines Simulation Heat transfer Chemical reaction COMSOL

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

Impact of microbial communities from tropical soils on the mobilization of trace metals during dissolution of cinnabar ore

引用

Journal of Environmental Sciences 2017年第6期29卷 122-130页

作者： Clarisse Balland-Bolou-Bi Benjamin Turc Vanessa Alphonse Noureddine Bousserrhine UniversitéParis-Est crùteil Val de Marne institute of Ecology and Enuironmental Sciences of Paris(UMR 7618)61 auenue du Général De Gaulle94010 Créteil cedexFrance

Biodissolution experiments on cinnabar ore （mercury sulphide and other sulphide minerals, such as pyrite） were performed with microorganisms extracted directly from soil. These experiments were carried out in closed systems under aerobic and anaerobic conditions with 2 different soils sampled in French Guyana. The two main objectives of this study were （1） to quantify the ability of microorganisms to mobilize metals （Fe, A1, Hg） during the dissolution of cinnabar ore, and （2） to identify the links between the type and chemical properties of soils, environmental parameters such as season and the strategies developed by indigenous microorganisms extracted from tropical natural soils to mobilize metals, Results indicate that microbial communities extracted directly from various soils are able to （1） survive in the presence of cinnabar ore, as indicated by consumption of carbon sources and, （2） leach Hg from cinnabar in oxic and anoxic dissolution experiments via the acidification of the medium and the production of low molecular mass organic acids （LMMOAs）. The dissolution rate of cinnabar in aerobic conditions with microbial communities ranged from 4.8 x 10-4 to 2.6 x 10-3 μmol/m2/day and was independent of the metabolites released by the microorganisms. In addition, these results suggest an indirect action by the microorganisms in the cinnabar dissolution. Additionally, because iron is a key element in the dynamics of Hg, microbes were stimulated by the presence of this metal, and microbes released LMMOAs that leached iron from iron-bearing minerals, such as pyrite and oxy-hydroxide of iron, in the mixed cinnabar ore.

关键词： Low molecular mass organic acidsCinnabar oreMicrobial communitiesTropical soils

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

Semiology:A Comparative Science of Institutions

引用

Language and Semiotic Studies 2022年第1期8卷 6-15页

作者： Rossana de Angelis UniversitéParis-Est créteil France

The Saussurian notion of semiology is closely linked to that of *** fact,in Saussure’s words,“systems of signs” are “social institutions”.Furthermore,language is conceived as a “special system” in relation to others “in the set of semiological facts”.Among different semiological systems,writing also occupies a special *** there is a real difference between language and writing,we could look for it in the power of externalization,which confers to writing a sort of exemplarity among the other *** we will see in this article,writing reveals the process of institutionalization itself,as well as the rational sociality of reasoning institutions and the irrational sociality of unreasoning institutions as ***,which is the discipline studying these phenomena and their differences,can be considered as a comparative science of institutions.

关键词： semiology language writing institution signs systems

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

An Empirical Study on the Online + Offline Flipped Classroom Teaching Model for Photoshop in the Age of Internet

引用

Journal of Contemporary Educational Research 2020年第10期4卷 111-114页

作者： Qun Xu Jaewook Shin Kim Ae-Hyun Shanghai lida University China Dong-A University South Korea

This paper mainly investigates the research status of online+offline flipped classroom teaching mode for Photoshop,studies the theoretical basis of flipped classroom,and summarizes the research direction of online+offline flipped *** addition,the Photoshop flipped classroom teaching was carried *** empirical research mainly studies the application of the flipped classroom from the aspects of preliminary preparation and teaching ***,the effect of the flipped classroom is studied in order to provide data and basis for follow-up research.

关键词： Online offline Flipped classroom Photoshop Teaching mode

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

Influence of random uncertainties of anisotropic fibrous model parameters on arterial pressure estimation

引用

Applied Mathematics and Mechanics(English Edition) 2013年第5期34卷 529-540页

作者： A.EDDHAHAK-OUNI I.MASSON F.MOHAND-KACI M.ZIDI Arts et Mtiers ParisTech(ENSAM-ESTP/IRC) Institut de Recherche en ConstructibilitUniversit Paris-Est Crteil Centre de Recherches Chirurgicales Facult de MdecineUniversit Paris-Est Crteil

This paper deals with a stochastic approach based on the principle of the maximum entropy to investigate the effect of the parameter random uncertainties on the arterial pressure. Motivated by a hyperelastic, anisotropic, and incompressible constitutive law with fiber families, the uncertain parameters describing the mechanical behavior are considered. Based on the available information, the probability density functions are attributed to every random variable to describe the dispersion of the model parameters. Numerous realizations are carried out, and the corresponding arterial pressure results are compared with the human non-invasive clinical data recorded over a mean cardiac cycle. Furthermore, the Monte Carlo simulations are performed, the convergence of the probabilistic model is proven. The different realizations are useful to define a reliable confidence region, in which the probability to have a realization is equM to 95%. It is shown through the obtained results that the error in the estimation of the arterial pressure can reach 35% when the estimation of the model parameters is subjected to an uncertainty ratio of 5%. Finally, a sensitivity analysis is performed to identify the constitutive law relevant parameters for better understanding and characterization of the arterial wall mechanical behaviors.

关键词： arterial pressure non-invasive clinical data hyperelasticity anisotropy random confidence region

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

Dual angiogenesis and PD-1 blockade in hepatocellular carcinoma

引用

Hepatobiliary Surgery and Nutrition 2020年第3期9卷 350-352页

作者： Julien Calderaro Département de Pathologie Centre Hospitalier Universitaire Henri MondorAssistance Publique Hôpitaux de ParisCréteilFrance Inserm U955 Team 18UniversitéParis-Est CréteilCréteilFrance

Hepatocellular carcinoma(HCC)is the fourth leading cause of cancer related-death worldwide and its incidence is rising in most western countries(1).

关键词： death carcinoma hepatocellular

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

Longitudinal analysis of quantitative biomarkers using projection-resolved OCT angiography in retinal vein occlusion

引用

Annals of Eye Science 2021年第2期6卷 19-31页

作者： Alexandra Miere Donato Colantuono Camille Jung Agnès Glacet-Bernard Severine Becuwe Eric Petit Eric Souied Department of Ophthalmology Centre Hospitalier Intercommunal de CréteilUniversitéParis EstCréteilFrance Laboratory of Images Signals and Intelligent Systems Laboratory(LISSI/EA 3956)University Paris-EstCréteilFrance Clinical Research Center GRC Maculaand Biological Ressources CenterCentre Hospitalier Intercommunal de CréteilCréteilFrance UNIACT NeurospinISVFJCEAGif-sur-YvetteFrance

Background:To evaluate a fully automated vascular density(VD),skeletal density(SD)and fractal dimension(FD)method for the longitudinal analysis of retinal vein occlusion(RVO)eyes using projection-resolved optical coherence tomography angiography(OCTA)images and to evaluate the association between these quantitative variables and the visual prognosis in RVO ***:Retrospective longitudinal observational case *** presenting with RVO to creteil University Eye Clinic between October 2014 and December 2018 and healthy controls were retrospectively *** 1 consisted of central RVO(crVO)eyes,group 2 consisted of eyes with branch RVO(BRVO)and group 3 of healthy control *** acquisitions(AngioVue RTVue XR Avanti,Optovue,Inc.,Freemont,CA)were performed at baseline and last follow up ***,SD,and FD analysis were computed on OCTA superficial and deep vascular complex(SVC,DVC)images at baseline and final follow up using an automated *** regression was performed to find if and which variable(VD,SD,FD)was predictive for the visual ***:Forty-one eyes,of which 21 consecutive eyes of 20 RVO patients(13 crVO in group 1,8 BRVO in group 2),and 20 eyes of 20 healthy controls were *** the level of SVC,VD and FD were significantly lower in RVO eyes compared to controls(P<0.0001 and P=0.0008 respectively).Best-corrected visual acuity(BCVA)at last follow-up visit was associated with baseline VD(P=0.013),FD(P=0.016),and SD(P=0.01)at the level of the SVC,as well as with baseline FD at the DVC level(P=0.046).Conclusions:Baseline VD,SD,and FD are associated with the visual outcome in RVO *** parameters seem valuable biomarkers and may help improve the evaluation and management of RVO patients.

关键词： Retinal vein occlusion(RVO) vascular density(VD) optical coherence tomography angiography(OCTA) fractal dimension(FD) image analysis

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

Acute lung injury in mechanically ventilated patients with epidermal necrolysis:an exposed-unexposed retrospective cohort study

引用

Burns & Trauma 2020年第1期8卷 30-33页

作者： S.Lalevée J.Catano S.Ingen-Housz-Oro M.Surenaud J.Tran Van Nhieu F.Schlemmer I.Bendib A.Mekontso-Dessap S.Hue N.de Prost Service de dermatologie AP-HPhoital Henri MondorCréteilFrance UniversitéParis Est créteil INSERM U955IMRBF-94010 CréteilFrance Service de Médecine Intensive Réanimation Hoitaux Universitaires Henri MondorAssistance Publique-Hoitaux de ParisCréteil Cedex 94010France EA7379 EpidermE UPECCréteilFrance Centre de référence des dermatoses bulleuses toxiques et toxidermies graves TOXIBUL CréteilFrance Service d’Anatomopathologie AP-HPhoital Henri MondorCréteilFrance Unitéde Pneumologie Service de Médecine Intensive RéanimationHoitaux Universitaires Henri MondorAssistance Publique-Hoitaux de ParisCréteil Cedex 94010France Groupe de Recherche Clinique CARMAS Facultéde Santéde CréteilUniversitéParis Est CréteilCréteil Cedex 94010France AP-HP Département d’Hématologie et d’Immunologie biologiquesGroupe hospitalouniversitaire Chenevier MondorAssistance Publique-Hoitaux de Paris F-94010 CréteilFrance

To the Editor,During the acute phase of epidermal necrolysis(EN,including Stevens-Johnson syndrome and toxic epidermal necrolysis),mucosal lesions involving the tracheo-bronchial tract have been reported[1,2]and approximately one in four EN patients develop acute respiratory failure and require endotracheal intubation and mechanical ventilation(MV)support[3].Asymptomatic respiratory sequelae may be detected on pulmonary function tests after the acute phase in as much as 50%of EN patients,possibly related to pulmonary lesions that occurred at the acute phase[4].

关键词： acute patients respiratory

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

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：