检索结果-南通市图书馆

激光与红外 1974年第11期 36-37页

作者： c.corsi I.Alfieri G.Petrocco 昭华

在BaF2、Nacl和（111）Ge衬底上溅射的外延单晶PbxSn1-xTe薄膜,其载流子浓度和迁移率值已接近于块状单晶。

关键词：阴极溅射淀积 Pb_xSn 霍尔迁移率衬底基片外延层

Important step towards an understanding of the exotic Z_(c)(3900)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2024年第9期67卷 199-200页

作者： c.Hanhart Institute for Advanced Simulation Forschungszentrum JulichJilich D-52425Germany

The Standard Model of particle physics,which contains the field theories for the electro-weak interaction(QED)and the strong interaction(QcD),is an extremely successful theory describing a huge variety of phenomena at... 详细信息

关键词： interaction atomic describing

Influence of B4c and ZrB2 reinforcements on microstructural,mechanical and wear behaviour of AA 2014 aluminium matrix hybrid composites

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

Defence Technology（防务技术） 2024年第10期40卷 242-254页

作者： Ramesh Babu R Rajendran c Saiyathibrahim A Rajkumar Velu Department of Mechanical Engineering Karpagam Institute of TechnologyCoimbatore 641105India Department of Mechanical Engineering Sri Krishna College of Engineering and TechnologyCoimbatore 641008India Department of Mechanical Engineering Indian Institute of Technology JammuJammu and Kashmir 181221India

considering their affordability and high strength-to-weight ratio,lightweight aluminium alloys are the subject of intensive research aimed at improving their properties for use in the aerospace *** research effort aims to develop novel hybrid composites based on AA 2014 alloy through the use of liquid metallurgy stir casting to reinforce dual ceramic particles of Zirconium Diboride(ZrB_(2))and Boron carbide(B4c).The weight percentage(wt%)of ZrB_(2) was varied(0,5,10,and 15),while a constant 5 wt%of B4c was maintained during this *** as-cast samples have been assessed using an Optical Microscope(OM)and a Scanning Electron Microscope(SEM)with Energy Dispersive Spectroscopy(EDS).The properties such as hardness,tensile strength,and wear characteristics of stir cast specimens were assessed to examine the impact of varying weight percentages of reinforcements in AA 2014 *** particular,dry sliding wear behaviour was evaluated considering varied loads using a pin-on-disc *** the weight%of ZrB_(2) grew and B4c was incorporated,hybrid composites showed higher hardness,tensile strength,and wear ***,the incorporation of a cumulative reinforcement consisting of 15 wt%ZrB_(2) and 5 wt%B4c resulted in a significant 31.86%increase in hardness and a 44.1%increase in tensile strength compared to AA 2014 *** addition,it has been detected that wear resistance of hybrid composite pin(containing 20 wt%cumulative reinforcement)is higher than that of other stir cast wear test pins during the whole range of applied *** surfaces of tensile specimens showed ductile fracture in the AA 2014 matrix and mixed mode for hybrid *** surfaces obtained employing higher applied load indicated abrasive wear with little plastic deformation for hybrid composites and dominant adhesive wear for matrix ***,the superior mechanical and tribological performance of hybrid composites can be attributed to dual reinforcement pa

关键词： AA 2014 alloy Stir casting Hybrid composite Hardness Tensile strength Specific wear rate

利用多层cT的三维数据进行心肌灌注容量测量:与核素灌注成像比较

在线全文

学校读者我要写书评

暂无评论

国际医学放射学杂志 2010年第2期 199-199页

作者： N.Kachenoura F.Veronesi J.A.Lodato c.corsi R.Mehta B.Newby 袁瑛 University of chicago Medical center Mc5084 5841 S.MarylandAveChicagoIL60637USA

虽然多层cT对急慢性心肌梗死之灌注异常的诊断能力已得到证实,但采用的是对二维断层图像进行选择性肉眼分析的方法。本研究旨在研究一种利用三维数据进行心肌灌

关键词：心肌灌注核素 MDcT cT 三维数据

心肌灌注:休息及扩血管应力情况下采用对比增强MR成像行近自动化评估

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

国际医学放射学杂志 2013年第1期 68-68页

作者： G.Tarroni c.corsi P.F.Antkowiak F.Veronesi c.M.Kramer F.H.Epstein 范文骏 Departments of Medicine and cardiology University of Chicago5841 S Maryland AveMC 5084ChicagoIL 60637

目的开发并论证一种在扩血管应力心脏MR成像时近自动化地评价心肌感兴趣区灌注情况的技术。材料与方法研究获得单位伦理委员会许可,所有病人均签署了知情同意书。在非刚性配准基础上,以影像噪声密度分布判定心脏内外膜的边界。研究对象... 详细信息

目的开发并论证一种在扩血管应力心脏MR成像时近自动化地评价心肌感兴趣区灌注情况的技术。材料与方法研究获得单位伦理委员会许可,所有病人均签署了知情同意书。在非刚性配准基础上,以影像噪声密度分布判定心脏内外膜的边界。研究对象共42例,包括15例心肌灌注正常的受试者和27例行冠状动脉造影的病人,在休息和扩血管(腺苷或热加腺苷)应力两种状态下分别行对比剂增强心脏(1.5T)MR成像。近自动化地形成时间对比增强曲线,用于计算灌注指数。将结果与常规人工分析方法对比,对于程度超过50%的狭窄以定量冠状动脉造影为参照。统计学分析方法包括Studentt检验、线性回归、Bland-Altman分析和κ统计。结果每个序列的分析时间少于1min,在休息和扩血管应力状态下分别获得高质量的对比增强曲线(平均信噪比分别为17±7和22±8),以期获得首过灌注情况。灌注指数准确地反映了扩血管应力所致的心肌充血改变[上升速度从(6.7±2.3)/s到(15.6±5.9)/s,Pc)曲线下面积分别为0.72和0.73]。结论尽管对比增强序列存在动态特点和呼吸运动的影响,在休息和扩血管应力状态下快速近自动化地进行心肌组织分割、准确定量评价组织对比仍具有可行性。本技术与常规人工分析方法具有相同的准确性,能够显示应力所致的灌注异常。

关键词：对比增强应力状态受力状态扩血管 MR 心肌灌注

Light sheet microscope scanning of biointegrated microlasers for localized refractive index sensing

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2024年第8期12卷 1673-1680页

作者： ROSS c.cOWIE MARcEL ScHUBERT SUPA School of Physics and AstronomyUniversity of St AndrewsSt AndrewsUK Humboldt centre for Nano and Biophotonics Department of ChemistryUniversity of CologneCologneGermany

Whispering gallery mode(WGM)microlasers are highly sensitive to localized refractive index changes allowing to link their emission spectrum to various chemical,mechanical,or physical *** recently found applications in biological studies within single cells,in three-dimensional samples such as multicellular spheroids,or in ***,detailed studies of biological samples also need to account for the structural heterogeneity of tissues and live animals,therefore requiring a combination of high-resolution microscopy and laser ***,we design and construct a light sheet fluorescence microscope with a coupled spectrometer for use in microlaser studies for combined high-resolution,high-speed imaging and WGM spectral *** light sheet illumination profile and the decoupled geometry of excitation and emission hereby directly affect the lasing and sensing properties,mainly through geometric constraints and by light coupling *** demonstrate the basic working principle of microlaser spectroscopy under light sheet excitation and measure the absolute refractive index within agarose and in zebrafish tail muscle *** further analyze the light coupling conditions that lead to the occurrence of two separate oscillation *** so-called cross modes can be scanned around the entire microlaser surface,which allows to estimate a surface-averaged refractive index profile of the microlaser environment.

关键词： refractive index excitation

A toast to a zebrafish germ cell induction cocktail

在线全文

学校读者我要写书评

暂无评论

Science china(Life Sciences) 2024年第6期67卷 1314-1315页

作者： Mary c.Mullins Department of cell and Developmental Biology University of Pennsylvania Perelman School of MedicinePhiladelphia 19104USA

The zebrafish field is ringing in the new year with a publication from Yonghua Sun's laboratory(Wang et al.,2023)of a cocktail of germline factors that can induce all cells of the zebrafish embryo into primordial germ cells(PGcs)at phenomenal *** major advance is not only of great interest to germ cell biologists,but it has important applications to the entire zebrafish field,as shown in Wang et al.(2023).

关键词： fish zebra field

convergence,Scalarization and continuity of Minimal Solutions in Set Optimization

在线全文

学校读者我要写书评

暂无评论

Journal of the Operations Research Society of china 2024年第3期12卷 773-793页

作者： Karuna c.S.Lalitha Department of Mathematics University of DelhiDelhiDelhi110007India Department of Mathematics University of Delhi South CampusNew DelhiDelhi110021India

The paper deals with the study of two different aspects of stability in the given space as well as the image space,where the solution concepts are based on a partial order relation on the family of bounded subsets of a real normed linear *** first aspect of stability deals with the topological set convergence of families of solution sets of perturbed problems in the image space and Painlevé–Kuratowski set convergence of solution sets of the perturbed problems in the given *** convergence in the given space is also established in terms of solution sets of scalarized perturbed *** second aspect of stability deals with semicontinuity of the solution set maps of parametric perturbed problems in both the spaces.

关键词： Topological convergence Painlevé-Kuratowski convergence Upper semicontinuity Lower semicontinuity Stability Scalarization

Performance of evolutionary optimized machine learning for modeling total organic carbon in core samples of shale gas fields

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

Petroleum 2024年第1期10卷 150-164页

作者： Leonardo Goliatt c.M.Saporetti L.c.Oliveira E.Pereira Department of computational and Applied Mechanics Federal University of Juiz de ForaJuiz de ForaBrazil Department of computational Modeling Polytechnic InstituteRio de Janeiro State UniversityNova FriburgoBrazil Petrobras Rio de JaneiroBrazil Department of Stratigraphy and Paleontology Rio de Janeiro State UniversityRio de JaneiroBrazil

Rock samples'TOc content is the best indicator of the organic matter in source *** origin rock samples’analysis is used to calculate it manually by *** method requires time and resources because it relies on samples from many well intervals in source ***,research has been done to aid this *** learning algorithms can estimate total organic carbon instead of well logs and stratigraphic *** light of these efforts,the current work present a study on automating the total organic carbon estimation using machine learning approaches improved by an evolutionary methodology to give the model flexibility and *** algorithms,differential evolution,particle swarm optimization,grey wolf optimization,artificial bee colony,and evolution strategies were used to improve machine learning models to predict *** six metaheuristics were integrated into four machine learning methods:extreme learning machine,elastic net linear model,linear support vector regression,and multivariate adaptive regression *** samples from the YuDong-Nan shale gas field,located in the Sichuan basin,were used to evaluate the hybrid *** findings show that combining machine learning models with an evolutionary algorithms in a hybrid fashion produce flexible models that accurately predict *** results show that,independent of the metaheuristic used to guide the model selection,optimized extreme learning machines attained the best performance scores according to six *** hybrid models can be used in exploratory geological research,particularly for unconventional oil and gas resources.

关键词： Total organic carbon Hybrid models Automated machine learning Evolutionary algorithms Geology

A perspective on utilizing the minority stress model for HIV and mental health care for men who have sex with men

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2024年第8期17卷 333-334页

作者： Rowalt c.Alibudbud Department of Sociology and Behavioral Sciences De La Salle UniversityManilaPhilippines

In 2022,the Joint United Nations Programme on HIV/AIDS(UNAIDS)and the World Health Organization(WHO)called upon global,regional,national,and local stakeholders to embrace a holistic approach to person-centered HIV prevention,treatment,and care[1].This approach emphasizes integrating mental health and psychosocial support services into existing frameworks[1].It recognizes the critical role these services play in addressing mental distress and improving the overall well-being and quality of life for people living with HIV[1].In light of men who have sex with men(MSM)remaining a key population affected by HIV[1],it becomes imperative to delve into the shared factors that influence their HIV care and mental health,among which minority stress stands out as a critical consideration.

关键词： prevention distress stress