检索结果-南通市图书馆

Devitrification process in rapidly solidified Al-Ni-Cu-Nd metallic glass

在线全文

学校读者我要写书评

暂无评论

journal of Central South University of Technology 2003年第3期10卷 163-167页

作者：肖于德黎文献 D.jacovkis N.Clavaguera M.T.Clavaguera-Mora j.rodriguez-viejo College of Materials Science and Engineering Central South University Changsha 410083 China Grup de Fisica de Materials I Departament de FisicaUniversitat Autonoma de Barcelona 08193 Bellaterra Spain Fisica de l'Estat Solid Facultat de Fisica Universitat de BarcelonaDiagonal 647 08028 Barcelona Spain College of Materials Science and Engineering Central South University Changsha 410083 China Grup de Fisica de Materials I Departament de Fisica Universitat Autonoma de Barcelona 08193 Bellaterra Spain Fisica de l'Estat Solid Facultat de Fisica Universitat de Barcelona Diagonal 647 08028 Barcelona Spain)

In the present study, rapidly solidified ribbons of Al87 Ni7Cu3 Nd3 metallic glass was prepared by usingmelt spinning. Devitrification process of the totally amorphous ribbons was investigated by high temperature X-raydiffraction analysis, combining with differential scanning calorimetry, under continuous and isothermal heating re-gime. The X-ray diffraction intensity and full width at the half maximum (FWHM) were analyzed to investigate theincrease of crystallized amount and growth of α-Al crystal particles. The results show that under continuous heatingregime, the metallic glass devitrifies via two main stages: primary crystallization, resulting in two-phase mixture ofα-Al plus residual amorphous phase, and secondary crystallization, corresponding to rapid precipitation of some in-ter-metallic phases in the form of dispersion or eutectic mixture. Under isothermal heating regime, only Al crystalprecipitates from the Al-rich amorphous matrix at low temperature, and when heating at 280 ℃ only Al crystal pre-cipitates within a short time, and then Al8 Cu4 Nd forms, followed by Al3 Ni, in the residual amorphous phase. Whenheating at higher temperature or for longer time, Aln Nd3 forms, the amorphous phase disappears, and the ribbonsdevelop into polycrystalline morphologies with multiply phase mixture of a-Al, Al8 Cu4 Nd, Al3 Ni, and Al11 Nd3.

关键词： rapid solidification Al-rich amorphous alloy devitrification process phase transformation

STUDIES ON PRIMARY CRYSTALLIZATION OF RAPIDLY QUENCHED Al-Ni-Cu-Nd METALLIC GLASS BY USING HIGH RESOLUTION TRASMISSION ELECTRON MICROSCOPY

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2003年第5期16卷 407-415页

作者： M.T.Clavaguera-Mora j.rodriguez-viejo Y.D.Xiao W.X.Li D.jacovkis N.Clavaguera GrupdeFisicadeMaterialsI DepartamentdeFisicaUniversitat-AutonomadeBarcelona08193BellaterraSlaain CollegeofMaterialsScienceandEngineering Central-SouthUniversityChangsha410083China Fisicadel‘EstatSolid FacultatdeFisicaUniversitatdeBarcelonaDiagonal64708028BarcelonaSpain

Rapidly solidified Al87Ni7Cu3Nd3 metallic glasses, prepared by using melt spinning, were treated under both isothermal and non-isothermal regime. The amorphous ribbon and the annealed samples were closely examined by means of differential scanning calorimetric, conventional X-ray diffraction and high resolution transmission electron microscopy with selected-area electron diffraction, with special interest in primary crystallization into α-Al nanocrystalline particles, in order to understand structural characteristics of Al-based amorphous/nanocrystalline alloys, and nucleation and grain growth mechanism on the nanometer scale during primary crystallization. The results show that, the as-prepared ribbons are fully amorphous and homogeneous in the micron scale, but contain high density of quenched-in clusters or crystallite embryos. Primary crystallization mainly leads to formation of two-phase mixture of a-Al crystal and residual amorphous phase. The annealed ribbons exposed isother-mally at HOP C for 5, 130 minutes and heated continuously up to less than 310℃ at 40℃ C/min consist of large amount of α-Al fcc crystal nanoparticles dispersed uniformly in an amorphous matrix. However, a very little amount of finer orthorhombic Al3Ni intermetalics particles exist in the annealed ribbons heated up to 310℃. During primary crystallization, the leading kinetic mechanics to impede growth of the α-Al crystal is soft impingement, instead of geometric impingement.

关键词： rapid solidification Al-rich amorphous alloy crystallization nu- cleation and growth mechanism

在线全文

学校读者我要写书评

暂无评论

书写“入场券”

科学新闻 2024年第4期 63-64页

作者： Violeta j.rodriguez 倪伟波美国伊利诺伊大学厄巴纳—香槟分校

“作为一个移民，你是怎么发表这么多作品的？”去年我参加教师职位面试时，了解到我的母语不是英语后，人们无数次地问我类似的问题。我知道公开的奋斗故事不太可能让我找到工作，所以我会笑着说：“我喜欢写作！”但事实是写作并不容...

“作为一个移民，你是怎么发表这么多作品的？”去年我参加教师职位面试时，了解到我的母语不是英语后，人们无数次地问我类似的问题。我知道公开的奋斗故事不太可能让我找到工作，所以我会笑着说：“我喜欢写作！”但事实是写作并不容易。9岁时，只懂西班牙语的我来到美国。读本科时，我花了几个月时间写毕业论文。我认为它已经足够好了，结果从导师那里拿回论文时，它被涂满了鲜红色标记，表明我还有很长的路要走。我知道自己需要逐渐形成出版记录，以便在一个像我这样背景的人稀缺的世界中脱颖而出。

关键词：

Identific tion of quantitative trait loci and associated candidate genes for pregnancy success in Angus–Brahman crossbred heifers

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

journal of Animal Science and Biotechnology 2024年第1期15卷 162-170页

作者： Quinn A.Hoorn Gabriel A.Zayas Eduardo E.rodriguez Laura M.jensen Raluca G.Mateescu Peter j.Hansen Department of Animal Sciences Donald Henry Barron Reproductive and Perinatal Biology Research Programand the Genetics InstituteUniversity of FloridaGainesvilleFLUSA School of Applied Systems Biology La Trobe UniversityBundooraVIC 3083Australia

Background In beef cattle, more than 50% of the energy input to produce a unit of beef is consumed by the female that produced the calf. Development of genomic tools to identify females with high genetic merit for reproductive function could increase the profitability and sustainability of beef *** Genome-wide association studies(GWAS) were performed using a single-step genomic best linear unbiased prediction approach on pregnancy outcome traits from a population of Angus–Brahman crossbred heifers. Furthermore, a validation GWAS was performed using data from another farm. Heifers were genotyped with the Bovine GGP F250 array that contains 221,077 SNPs. In the discovery population, heifers were bred in winter breeding seasons involving a single round of timed artificial insemination(AI) followed by natural mating for 3 months. Two phenotypes were analyzed: pregnancy outcome to first-service AI(PAI;n = 1,481) and pregnancy status at the end of the breeding season(PEBS;n = 1,725). The heritability was estimated as 0.149 and 0.122 for PAI and PEBS, respectively. In the PAI model, one quantitative trait locus(QTL), located between 52.3 and 52.5 Mb on BTA7, explained about 3% of the genetic variation, in a region containing a cluster of γ-protocadherin genes and SLC25A2. Other QTLs explaining between 0.5% and 1% of the genetic variation were found on BTA12 and 25. In the PEBS model, a large QTL on BTA7 was synonymous with the QTL for PAI, with minor QTLs located on BTA5, 9, 10, 11, 19, and 20. The validation population for pregnancy status at the end of the breeding season were Angus–Brahman crossbred heifers bred by natural mating. In concordance with the discovery population, the large QTL on BTA7 and QTLs on BTA10 and 12 were *** In summary, QTLs and candidate SNPs identified were associated with pregnancy outcomes in beef heifers, including a large QTL associated with a group of protocadherin genes. Confirmation of these associations

关键词： Beef cattle Fertility GWAS QTL

Mortality rate after total knee arthroplasty or total hip arthroplasty in patients with a history of liver transplant

在线全文

学校读者我要写书评

暂无评论

World journal of Orthopedics 2024年第4期15卷 310-311页

作者： E Carlos rodriguez-Merchan Department of Orthopedic Surgery La Paz University Hospital-IdiPazMadrid 28046Spain

In this editorial I comment on the article by Ahmed et al published in a recent issue of the World j Orthop 2023;14:*** is well known that patients who have undergone a liver transplant(LT)may need to have a total hip arthroplasty(THA)or total knee arthroplasty(TKA)*** et al stated that the mortality rate in these patients was similar to the one of the general ***,there are three articles previously published that found higher mortality in LT patients who experienced THA/TKA than in the general population(individuals without LT).Therefore,in this Editorial I would like to point out that there is controversy in the literature regarding whether LT patients undergoing THA/TKA have higher mortality than the general ***,future research should attempt to resolve this controversy.

关键词： Liver transplant Total knee arthroplasty Total hip arthroplasty Results Mortality

Atomic and Close-to-Atomic Scale Manufacturing:A Review on Atomic Layer Removal Methods Using Atomic Force Microscopy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nanomanufacturing and Metrology 2020年第3期3卷 167-186页

作者： Paven Thomas Mathew Brian j.rodriguez Fengzhou Fang Centre of Micro/Nano Manufacturing Technology(MNMT-Dublin) University College DublinDublin D04V1W8Ireland School of Physics University College DublinBelfieldDublin D04 V1W8Ireland Conway Institute of Biomolecular and Biomedical Research University College DublinBelfield.Dublin D04V1W8Ireland State Key Laboratory of Precision Measuring Technology and Instruments Centre of Micro/Nano Manufacturing TechnologyMNMT.Tianjin UniversityTianjin 300072China

Manufacturing at the atomic scale is the next generation of the industrial *** and close-to-atomic scalemanufacturing(ACSM)helps to achieve *** force microscopy(AFM)is a promising method for this purposesince an instrument to machine at this small scale has not yet been *** the need for increasing the number ofelectronic components inside an integrated circuit chip is emerging in the present-day scenario,methods should be adoptedto reduce the size of connections inside the *** can be achieved using ***,connecting moleculeswith the electrodes and then to the external world is *** must be laid to make this possible for *** layer removal,down to one atom,can be employed for this ***,theoretical works are beingperformed extensively to study the interactions happening at the molecule-electrode junction,and how electronic transportis affected by the functionality and robustness of the *** theoretical studies can be verified experimentally only if nano electrodes are *** is widely used in the semiconductor industry to fabricate electronic ***,carbon-based materials such as highly oriented pyrolytic graphite,gold,and silicon carbide find applications inthe electronic device manufacturing ***,ACSM of these materials should be developed *** paperpresents a review on the state-of-the-art research performed on material removal at the atomic scale by electrochemical andmechanical methods of the mentioned materials using AFM and provides a roadmap to achieve effective mass productionof these devices.

关键词： Atomic force microscopy Atomic-scale manufacturing Molecular scale devices Electrochemistry ACSM ManufacturingⅢ

Liquid-phase 3D bioprinting of gelatin alginate hydrogels:influence of printing parameters on hydrogel line width and layer height

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Bio-Design and Manufacturing 2019年第3期2卷 172-180页

作者： Maha Alruwaili jose A.Lopez Kevin McCarthy Emmanuel G.Reynaud Brian j.rodriguez Conway Institute of Biomolecular and Biomedical Research University College DublinDublinIreland School of Physics University College DublinDublinIreland School of Biomolecular and Biomedical Science University College DublinDublinIreland

Extrusion-based 3D bioprinting is a direct deposition approach used to create three-dimensional(3D)tissue scaffolds typically comprising *** are hydrated polymer networks that are chemically or physically ***,3D bioprinting is performed in air,despite the hydrated nature of hydrogels and the potential advantage of using a liquid phase to provide cross-linking and otherwise functionalize the *** this work,we print gelatin alginate hydrogels directly into a cross-linking solution of calcium chloride and investigate the influence of nozzle diameter,distance between nozzle and surface,calcium chloride concentration,and extrusion rate on the dimensions of the printed *** hydrogel layer height was generally found to increase with increasing extrusion rate and nozzle distance,according to the increased volume extruded and the available space,*** addition,the hydrogel width was generally found to increase with decreasing nozzle distance and cross-linking concentration corresponding to confinement-induced spreading and low crosslinking regimes,***/height ratios of^1 were generally achieved when the nozzle diameter and distance were comparable above a certain cross-linking *** these relationships,biocompatible 3D multilayer structures were successfully printed directly into calcium chloride cross-linking solution.

关键词： Gelatin alginate Hydrogel Additive manufacturing 3D printing 3D bioprinting Biomaterials Extrusion Bioplotting

Explainable Artificial Intelligence(XAI)Model for Cancer Image Classification

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2024年第10期141卷 401-441页

作者： Amit Singhal Krishna Kant Agrawal Angeles Quezada Adrian rodriguez Aguiñaga Samantha jiménez Satya Prakash Yadav Department of Computer Science&Engineering Raj Kumar Goel Institute of TechnologyGhaziabad201017India Department of School of Computing Science and Engineering Galgotias UniversityGreater Noida203201India Tecnológico Nacional de México Campus Tijuana Baja California22414México Universidad Autónoma de Baja California TijuanaBaja California22414México Department of Computer Science and Engineering G.LBajaj Institute of Technology and Management(GLBITM)Affiliated to Dr.A.P.J.Abdul Kalam Technical UniversityLucknow201306India School of Computer Science Engineering and Technology(SCSET) Bennett UniversityGreater Noida201310India

The use of Explainable Artificial Intelligence(XAI)models becomes increasingly important for making decisions in smart healthcare *** is to make sure that decisions are based on trustworthy algorithms and that healthcare workers understand the decisions made by these *** models can potentially enhance interpretability and explainability in decision-making processes that rely on artificial ***,the intricate nature of the healthcare field necessitates the utilization of sophisticated models to classify cancer *** research presents an advanced investigation of XAI models to classify cancer *** describes the different levels of explainability and interpretability associated with XAI models and the challenges faced in deploying them in healthcare *** addition,this study proposes a novel framework for cancer image classification that incorporates XAI models with deep learning and advanced medical imaging *** proposed model integrates several techniques,including end-to-end explainable evaluation,rule-based explanation,and useradaptive *** proposed XAI reaches 97.72%accuracy,90.72%precision,93.72%recall,96.72%F1-score,9.55%FDR,9.66%FOR,and 91.18%*** will discuss the potential applications of the proposed XAI models in the smart healthcare *** will help ensure trust and accountability in AI-based decisions,which is essential for achieving a safe and reliable smart healthcare environment.

关键词： Explainable artificial intelligence artificial intelligence XAI healthcare cancer image classification

Toward Single-Atomic-Layer Lithography on Highly Oriented Pyrolytic Graphite Surfaces Using AFM-Based Electrochemical Etching

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nanomanufacturing and Metrology 2022年第1期5卷 32-38页

作者： Wei Han Paven Thomas Mathew Srikanth Kolagatla Brian j.rodriguez Fengzhou Fang Centre of Micro/Nano Manufacturing Technology(MNMT-Dublin) University College DublinDublin D04 V1W&I reland Shanghai Engineering Research Centre of Ultra-Precision Optical Manufacturing Fudan UniversityShanghai 200433China School of Physics University College DublinDublin D04 V1W&Ireland Conway Institute of Biomolecular and Biomedical Research University College DublinDublin D04 V1W&Ireland State Key Laboratory of Precision Measuring Technology and Instruments Laboratory of Micro/Nano Manufacturing Technology(MNMT)Tianjin UniversityTianjin 300072China

Atomic force microscopy(AFM)-based electrochemical etching of a highly oriented pyrolytic graphite(HOPG)surface is studied toward the single-atomic-layer lithography of intricate *** etching is performed in the water meniscus formed between the AFM tip apex and HOPG surface due to a capillary effect under controlled high relative humid-ity(~75%)at otherwise ambient *** conditions to etch nano-holes,nano-lines,and other intricate patterns are *** clectrochemical reactions of HOPG etching should not generatc debris duc to the conversion of graphite to gaseous CO and CO_(2)based on etching ***,debris is observed on the etched HOPG surface,and incom-plete gasification of carbon occurs during the etching process,resulting in the generation of solid ***,the applied potential is of critical importance for precise etching,and the precision is also significantly influenced by the AFM tip *** study shows that the AFM-based electrochemical etching has the potential to remove the material in a single-atomic-layer *** result is likely because the etching process is based on anodic dissolution,resulting in the material removal atom by atom.

关键词： Etching Lithography Electrochemical machining Atomic and close-to-atomic scale manufacturing(ACSM)