检索结果-南通市图书馆

国际医学放射学杂志 2024年第4期 496-497页

作者： j.w.chen y.P.xue l.h.Ren K.lv P.du h.X.cheng 胡佳圆

摘要目的建立一个深度学习（dl）模型用于预测脑膜瘤的肿瘤等级和病理标志物的表达。方法回顾性纳入2018年9月—2021年12月在2家医院接受手术切除的1 192例

关键词：

Microstructure and Strain hardening of a Friction Stir welded high-Strength Al–zn–Mg Alloy

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English letters) 2014年第4期27卷 723-729页

作者： A.h.Feng d.l.chen z.y.Ma w.y.Ma R.j.Song School of Materials Science and Engineering Tongji University State Key laboratory of Advanced welding Production Technology School of Materials Science and EngineeringHarbin Institute of Technology department of Mechanical and Industrial Engineering Ryerson UniversityTorontoON M5B 2K3Canada Shenyang national laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences

Microstructural evolution and strain hardening behavior of a friction stir welded（FSwed） high-strength7075Al-T651 alloy were *** nugget zone was observed to consist of fine and equiaxed recrystallized grains with a low dislocation density and free of original precipitates,but containing uniformly distributed *** strength,joint efficiency,and ductility of the FSwed joints increased with increasing welding speed.A joint efficiency of ＊91% was achieved at a welding speed of 400 mm/min and rotational rate of 800 r/min,while the ductility remained basically the same as that of the base *** was no obvious strain rate sensitivity observed in both base metal and welded *** both the base metal and FSwed joints exhibited stage III and IV hardening characteristics,the hardening capacity,strain hardening exponent,and strain hardening rate all increased after friction stir welding.

关键词： Aluminum alloy Friction stir welding Mechanical properties Strain hardening

determining minimum sample size for the conditioned latin hypercube sampling algorithm

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2024年第3期34卷 530-539页

作者： daniel d.SAURETTE Asim BISwAS Richard j.hEcK Adam w.GIllESPIE Aaron A.BERG School of Environmental Sciences University of Guelph50 Stone Rd EastGuelph ON N1G 2W1(Canada) Ontario Ministry of Agriculture Food and Rural Affairs1 Stone Rd WestGuelph ON N1G 2Y4(Canada) Geography Environment&GeomaticsUniversity of Guelph50 Stone Rd EastGuelph ON N1G 2W1(Canada)

In digital soil mapping(dSM),a fundamental assumption is that the spatial variability of the target variable can be explained by the predictors or environmental *** to adequately sample the predictors have been well documented,with the conditioned latin hypercube sampling(clhS)algorithm receiving the most attention in the dSM *** advances in sampling design,a critical gap remains in determining the number of samples required for dSM *** propose a simple workflow and function coded in R language to determine the minimum sample size for the clhS algorithm based on histograms of the predictor variables using the Freedman-diaconis rule for determining optimal bin *** preprocessing was included to correct for multimodal and non-normally distributed data,as these can affect sample size determination from the *** on a user-selected quantile range(QR)for the sample plan,the densities of the histogram bins at the upper and lower bounds of the QR were used as a scaling factor to determine minimum sample *** technique was applied to a field-scale set of environmental covariates for a well-sampled agricultural study site near Guelph,Ontario,canada,and tested across a range of *** results showed increasing minimum sample size with an increase in the QR *** sample size increased from 44 to 83 when the QR increased from 50% to 95% and then increased exponentially to 194 for the 99%*** technique provides an estimate of minimum sample size that can be used as an input to the clhS algorithm.

关键词： bin width digital soil mapping normal distribution quantile range sampling design

Thermodynamic property of sandwich cylindrical shell structure with metallic wire mesh:numerical modeling and experimental analysis

在线全文

学校读者我要写书评

暂无评论

chinese journal of Aeronautics 2024年第1期37卷 138-152页

作者： Xin xue Guojian ShEn juan lIAO Institute of Metal Rubber&Vibration noise School of Mechanical Engineering and AutomationFuzhou UniversityFuzhou 350116China Fujian Shuikou Power Generation Group co. LTDFuzhou 350000China

As a new addition to lightweight composite structures,the sandwich cylindrical shell with a metallic wire mesh core has emerged as a promising solution for thermodynamic performance analysis at elevated *** intricate interwoven cellular formations within the metallic wire mesh pose difficulties for thermo-mechanical modeling and property ***,the constitutive models employed to characterize hysteresis phenomena were presented,comprising isotropic elasticity,Bergstrom-Boyce model,Ogden hyper-elasticity,and parameter identification through mechanical examinations at varying ***,the finite element modeling of cylindrical shell structures was determined for modal and steady-state dynamic ***,the experimental procedures were carried out,including the preparation of the sandwich cylindrical shell and the dynamic testing *** first-order natural frequency of the cylindrical shell structure is close to the resonance frequency of the dynamic test results,with a maximum error of 6.5%,demonstrating the accuracy of the simulation *** compared to the solid-core cylindrical shell,the average insertion loss of the sandwich cylindrical shell structure within the frequency range of 10–1000 hz at room temperature is up to 11.09 ***,at elevated temperatures,the average insertion loss of the sandwich cylindrical shell decreases but fluctuates as the temperature changes.

关键词： Energy dissipation Metallic matrix composites numerical analysis Sandwich structure Thermodynamic properties

Multi-channel retarding field analyzer for EAST

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2018年第5期20卷 1-5页

作者： M hEnKEl d hOSchEn y lIAnG y lI S c lIU d nIcOlAI n SAndRI G SAThEESwARAn n yAn h X zhAnG the EAST team Forschungszentrum jülich Gmbh Institut für Energie-und Klimaforschung–PlasmaphysikPartner of the Trilateral Euregio Cluster(TEC)D-52425 JulichGermany Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China

A multi-channel retarding field analyzer（Mc-RFA） including two RFA modules and two langmuir probes to measure the ion and electron temperature profiles within the scrape-off layer was developed for investigations of the interplay between magnetic topology and plasma transport at the plasma *** Mc-RFA probe for the stellarator w7-X and first measurements at the tokamak EAST was *** probe head allows simultaneous multichannel ion temperature as well as for electron temperature *** usability for radial correlation measurements of the measured ion currents is also given.

关键词： retarding field analyzer multi-channel EAST ion temperature diagnostic

Interface property of dissimilar Ti-6Al-4V/AA1050 composite laminate made by non-equal channel lateral co-extrusion and heat treatment

在线全文

学校读者我要写书评

暂无评论

defence Technology（防务技术） 2024年第3期33卷 197-208页

作者： juan liao Mengmeng Tian Xin xue School of Mechanical Engineering and Automation Fuzhou UniversityFuzhou 350116China

The purpose of this paper is to examine the effect of processing parameters and subsequent heat treatments on the microstructures and bonding strengths of Ti-6Al-4V/AA1050 laminations formed via a non-equal channel lateral co-extrusion *** microstructural evolution and growth mechanism in the diffusion layer were discussed further to optimize the bonding quality by appropriately adjusting process *** electron microscopes(SEM),energy dispersive spectrometer(EdS),and X-ray diffraction(XRd)were used to characterize interfacial diffusion *** shear test was used to determine the mechanical properties of the interfacial diffusion *** experimental results indicate that it is possible to co-extrusion Ti-6Al-4V/AA1050 compound profiles using non-equal channel lateral *** heat treatment processes affect the thickness of the diffusion *** the temperature and time of heat treatment increase,the thickness of the reaction layers increases ***,the shear strength of the Ti-6Al-4V/AA1050 composite interface is proportional to the diffusion layer *** is observed that a medium interface thickness results in superior mechanical performance when compared to neither a greater nor a lesser interface *** characterization of all heat treatments reveals that the only intermetallic compound observed in the diffusion layers is TiAl_(3).due to the inter-diffusion of Ti and Al atoms,the TiAl_(3) layer grows primarily at AA1050/TiAl_(3) interfaces.

关键词： Shear strength co-extrusion heat treatment Microstructure Intermetallic compounds

coercivity Enhancement of nd-Fe-B Thin Film Magnets through dy Surface diffusion Process

在线全文

学校读者我要写书评

暂无评论

journal of Materials Science & Technology 2011年第9期27卷 826-830页

作者： c.y. you j. zhu n. Tian z.X. lu State Key laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China School of Materials Science and Engineering Xi＇an University of Technology Xi＇an 710048 China

The dy capping layer was deposited at different temperatures on the nd-Fe-B thin films to investigate the mechanism of the coercivity enhancement through the dy surface diffusion. The highest coercivity of 2005 kA/m （25.2 kOe） was obtained at the dy deposition temperature of 460℃, which was significantly higher than the value of 1297 kA/m （16.3 kOe） without dy capping layer. By performing the transmission electron microscopy （TEM） analysis, it was found that some of the grain boundaries were enriched with nd element, which could be partly ascribed to the promotion by the dy surface diffusion. In comparison to the evolution of the spin reorientation temperature of nd2Fe14B phase after the deposition of the dy capping layer, it is concluded that structural modification plays a significant role in the coercivity enhancement due to the dy surface diffusion.

关键词： nd-Fe-B thin film coercivity enhancement dy layer Microstructure

Particle elasticity influences polymeric artificial antigen presenting cell effectiveness in vivo via cd8+T cell activation,macrophage uptake,and the protein corona

在线全文

学校读者我要写书评

暂无评论

nano Research 2024年第10期17卷 9052-9064页

作者： Savannah E.Est-witte Sydney R.Shannon dennis h.Gong Kaitlyn G.calabresi jawaun j.harris Kaitlyn Storm Edwin j.yoo Ariel Isser Vivek P.jani natalie K.livingston Mary O.Omotoso Kelly Rhodes Elana Ben-Akiva Randall A.Meyer zoe T.hsieh Simone Sidoli Stephany y.Tzeng jonathan P.Schneck jordan j.Green Translational Tissue Engineering center Institute for NanobiotechnologyDepartment of Biomedical EngineeringJohns Hopkins School of Medicine400 N BroadwayBaltimoreMD 21231USA Institute for cell Engineering Department of PathologyJohns Hopkins School of Medicine733 N BroadwayBaltimoreMD 21205USA department of Biochemistry Albert Einstein College of MedicineThe BronxNew York CityNY 10461USA

Adoptive cell therapy(AcT)is an immunotherapy strategy for cancer that has seen widespread clinical *** AcT,patient-derived lymphocytes are stimulated with the antigen of interest ex vivo,proliferated,then returned to the patient to initiate an antigen-specific antitumor *** effective,this process is resource-intensive and logistically impossible for many *** artificial antigen presenting cells(aAPcs)offer a potential“off-the-shelf”alternative to ex vivo *** particulate aAPcs perform well in vitro,they have had limited success in vivo due to poor bioavailability after *** to bioavailability include rapid clearance,unfavorable biodistribution,and inadequate interactions with cd8+T cells at sites of *** properties such as elasticity have been shown to vastly impact the bioavailability and particle-cell interactions,but this has yet to be investigated in the context of aAPcs for in vivo T-cell *** literature likewise indicates that biomaterial properties,especially elasticity,can modulate T-cell activation in *** the goal of creating a more biomimetic,next-generation particulate aAPc,we developed a poly(ethylene)glycol hydrogel particle platform with tunable elasticity to investigate the impact of elasticity on antigen-specific T cell activation for in vivo adoptive *** this knowledge,we were able to gain more precise control over in vivo T cell activation and investigate possible mechanisms including the effects of aAPc elasticity on T cell binding,macrophage uptake,and the protein corona.

关键词： adoptive cell therapy artificial antigen presenting cells particle drug delivery elasticity protein corona poly(ethylene glycol)

Primary and Secondary Microplastic and nanoplastic Regulations: Perspectives on water Industry Impacts

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

journal of Environmental Protection 2024年第6期15卷 697-715页

作者： Shirin Estahbanati Giridhar Upadhyaya Martha j. M. wells Katherine y. Bell Brown and caldwell New York NY USA Brown and caldwell Irvine CA USA Envirochem Services Cookeville TN USA Brown and caldwell Nashville TN USA

Plastic pollution, both primary and secondary, is an environmental challenge, prompting regulatory actions at global and regional levels. with increasing research about the impacts of micro- and nanoplastics on ecosystems and human health, governments worldwide have undertaken efforts to address this issue. The global community has advanced regulatory efforts that have led to the implementation of national laws or regulations in numerous countries. These measures ban or restrict the use of primary and secondary microplastics and nanoplastics. An overview of global and European regulatory frameworks is presented to provide context for the United States (US). In the endeavor to document plastics regulation development in the US, a description of regulatory agencies and their roles in advancing policy and rules as well as future direction and areas for improvement in regulating plastics are introduced. A discussion of what emerging regulations mean to utilities and industries is also provided along with a comparison of regulatory frameworks.

关键词： Microplastic Regulation Environmental Governance Plastic Pollution Mitigation Regulatory Framework

Investigation of contact behavior on a model of the dual-mobility artificial hip joint for Asians in different inner liner thicknesses

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

world journal of Orthopedics 2024年第4期15卷 321-336页

作者： Taufiq hidayat Muhammad Imam Ammarullah Rifky Ismail Eko Saputra M danny Pratama lamura chethan K n Athanasius Priharyoto Bayuseno j jamari department of Mechanical Engineering Universitas Muria KudusKudus 59352Central JavaIndonesia department of Mechanical Engineering Universitas DiponegoroSemarang 50275Central JavaIndonesia Undip Biomechanics Engineering&Research centre Universitas DiponegoroSemarang 50275Central JavaIndonesia center for Biomechanics Biomaterials Biomechatronics and Biosignal Processing Universitas DiponegoroSemarang 50275Central JavaIndonesia department of Mechanical Engineering Politeknik Negeri SemarangSemarang 50275Central JavaIndonesia department of Aeronautical and Automobile Engineering Manipal Institute of TechnologyManipalManipal Academy of Higher EducationManipal 576104KarnatakaIndia

BAcKGROUnd The four components that make up the current dual-mobility artificial hip joint design are the femoral head,the inner liner,the outer liner as a metal cover to prevent wear,and the acetabular *** acetabular cup and the outer liner were constructed of 316l stainless *** the same time,the inner liner was made of ultra-high-molecular-weight polyethylene(UhMwPE).As this new dual-mobility artificial hip joint has not been researched extensively,more tribological research is needed to predict *** thickness of the inner liner is a significant component to consider when calculating the contact *** To make use of finite element analysis to gain a better understanding of the contact behavior in various inner liner thicknesses on a new model of a dual-mobility artificial hip joint,with the ultimate objective of determining the inner liner thickness that was most suitable for this particular type of dual-mobility artificial hip *** In this study,the size of the femoral head was compared between two diameters(28 mm and 36 mm)and eight inner liner thicknesses ranging from 5 mm to 12 *** the finite element method,the contact parameters,including the maximum contact pressure and contact area,have been evaluated in light of the hertzian contact *** simulation was performed statically with dissipated energy and asymmetric *** types of interaction were surface-to-surface contact and normal contact *** The maximum contact pressures in the inner liner(UhMwPE)at a head diameter of 28 mm and 36 mm are between 3.7-13.5 MPa and 2.7-10.4 MPa,*** maximum von Mises of the inner liner,outer liner,and acetabular cup are 2.4–11.4 MPa,15.7–44.3 MPa,and 3.7–12.6 MPa,respectively,for 28 mm *** the maximum von Mises stresses of the 36 mm head are 1.9-8.9 MPa for the inner liner,9.9-32.8 MPa for the outer liner,and 2.6-9.9 MPa for the acetabular cup.A head with a diameter of 28 mm should have an inner line

关键词： contact behavior contact pressure Finite element analysis dual-mobility Artificial hip joint