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Enhancing the formability of FeSi6.5 steel by the anodic polarization

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International Journal of Minerals,Metallurgy and Materials 2022年第11期29卷 2072-2078页

作者： Dong Zhao Feng Ye binbin Liu Haoyang Du Yaakov b.Unigovski Emmanuel M.Gutman Roni Shneck State Key laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China State Grid Jilin Electric Power Research Institute Jilin 130021China Department of Materials Engineering Ben-Gurion University of the NegevBeer-Sheva 84105Israel

The effect of anodic polarization on the plastic deformation behavior and formability of FeSi6.5 steel at room temperature was experimentally investigated through uniaxial tensile and drawing of wire specimen in sulfuric acid solution with current densities of 0-40 mA/*** formability of the FeSi6.5 steel was significantly improved after the anodic *** plastic elongation of the specimen as an anode in the electrochemical environment was 4.4%-7%,but 2.7%in the *** drawing force under the anodic polarization decreased by 12.5%-26%compared to that in deionized *** softening is mainly attributed to the relief in work hardening caused by surface atomic *** work hardening mechanism of the FeSi6.5 steel wires under anodic polarization condition was analyzed using Hollomon equation and Voce relation combined with the Kocks-Mecking *** data support the view that the surface atom dissolution facilitates dislocation ***6.5 steel wires were obtained using electrochemical cold drawing and presented a smooth surface and good ductility without crack after five-pass drawing with a total cross-section area reduction of 88%.The drawing with the assistance of anodic polarization is a promising technology for processing hard and brittle metal materials.

关键词： FeSi6.5 steel plastic deformation anodic polarization Voce equation

Secure data networks for electrical distribution applications

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Journal of Modern Power Systems and Clean Energy 2015年第3期3卷 447-455页

作者： David M.laVERTY John b.O’RAW Kang LI D.John MORROW School of EEECS Queen’s University Belfast125 Stransmillis RoadBelfast BT95AHUK

Smart Grids are characterized by the application of information communication technology(ICT)to solve electrical energy *** power networks span large geographical areas,thus a necessary component of many Smart Grid applications is a wide area network(WAN).For the Smart Grid to be successful,utilities must be confident that the communications infrastructure is *** paper describes how a WAN can be deployed using WiMAX radio technology to provide high bandwidth communications to areas not commonly served by utility communications,such as generators embedded in the distribution network.A planning exercise is described,using Northern Ireland as a case *** suitability of the technology for real-time applications is assessed using experimentally obtained latency data.

关键词： Telecoms latency WiMAX Security

Evidence for oxidative damage to prion protein in prion diseases

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维普期刊数据库

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Chinese Science bulletin 2000年第17期45卷 1546-1554页

作者： YANG Chiming (Chi Ming Yang)Institute for Life Science and Health at UCSD, P. O. box 12035, la Jolla, CA 92039, USA: College of Life Science & biotechnology, Shanghai JiaoTong University. Shanghai 200030, China: College of Chemistry, Nankui University, Tianjin 300071, Institute for Life Science and Health at UCSD La Jolla USA Shanghai JiaoTong University College of Life Science & Biotechnology China Nankai University College of Chemistry China

In prion diseases the irreversible protein structural transformation process is completed in the brains of mammals within a few months, the uniformly generated infectivity displays extraordinary resistance to inactivation, suggesting that a vital energy source is required for the production of infectious particles. Considering the high oxygen-respiration rate in the brains, prion protein oxidative damage can be the crucial factor. both theoretical consideration of the nature of protein radical reactions and a large body of previously unraveled feature of scrapie and prion diseases have provided multiple distinct lines of compelling evidence which persuasively support a suggestion that the infectious agents may be prion (free) radicals produced from protein oxidative damage. This paper describes that scrapie prions are most likely formed from prion radicals and oxidative species-mediated sequence-specific cross-linking of benign prion proteins.

关键词： prion oxidative damage sequence-specific free radicals variant of Creutzfeldt-Jakob disease (v CJD).

Solar flares with similar soft but different hard X-ray emissions： case and statistical studies

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Research in Astronomy and Astrophysics 2016年第1期16卷 39-50页

作者： Ivan N.Sharykin Alexei b.Struminsky Ivan V.Zimovets Wei-Qun Gan Space Research Institute Russian Academy of Sciences Moscow 117997 Russia Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210008 China

From the Reuven Ramaty High Energy Solar Spectroscopic Imager （RHESS1） catalog we select events which have approximately the same GOES class （high C - low M or 500-1200 counts s-1 within the RHESSI 6-12 keV energy band）, but with different maximal energies of detected hard X-rays. The selected events are subdivided into two groups：（1） flares with X-ray emissions observed by RHESSI up to only 50 keV and （2） flares with hard X-ray emission observed also above 50 keV. The main task is to understand observational peculiarities of these two flare groups. We use RHESSIX-ray data to obtain spectral and spa- tial information in order to find differences between selected groups. Spectra and images are analyzed in detail for six events （case study）. For a larger number of samples （85 and 28 flares in the low-energy and high-energy groups respectively） we only make some generalizations. In spectral analysis we use the thick- target model for hard X-ray emission and one temperature assumption for thermal soft X-ray emission. RHESSI X-ray images are used for determination of flare region sizes. Although thermal and spatial prop- erties of these two groups of flares are not easily distinguishable, power law indices of hard X-rays show significant differences. Events from the high-energy group generally have a harder spectrum. Therefore, the efficiency of chromospheric evaporation is not sensitive to the hardness of nonthermal electron spectra but rather depends on the total energy flux of nonthermal electrons.

关键词： Sun: flares -- Sun: X-rays -- gamma rays

Estimation of the van Genuchten Soil Water Retention Properties from Soil Textural Data

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Pedosphere 2010年第4期20卷 456-465页

作者： b. GHANbARIAN-AlaVIJEH A. LIAGHAT HUANG Guan-Hua M. Th. VAN GENUCHTEN Department of Irrigation and Reclamation Engineering University of Tehran Karaj 31587-77871 （Iran） Department of Earth and Environmental Sciences Wright State University Dayton OH 45435 （USA） Department of Irrigation and Drainage Engineering China Agricultural University Beijing 100083 （China） Department of Mechanical Engineering Federal University of Rio de Janeiro RJ 21945-970 （Brazil）

The van Genuchten (vG) function is often used to describe the soil water retention curve (SWRC) of unsaturated soils and fractured rock. The objective of this study was to develop a method to determine the vG model parameter m from the fractal dimension. We compared two approaches previously proposed by van Genuchten and Lenhard et al. for estimating m from the pore size distribution index of the brooks and Corey (bC) model. In both approaches we used a relationship between the pore size distribution index of the bC model and the fractal dimension of the SWRC. A dataset containing 75 samples from the UNSODA unsaturated soil hydraulic database was used to evaluate the two approaches. The statistical parameters showed that the approach by Lenhard et al. provided better estimates of the parameter m. Another dataset containing 72 samples from the literature was used to validate Lenhard's approach in which the SWRC fractal dimension was estimated from the clay content. The estimated SWRC of the second dataset was compared with those obtained with the Rosetta model using sand, silt, and clay contents. Root mean square error values of the proposed fractal approach and Rosetta were 0.081 and 0.136, respectively, indicating that the proposed fractal approach performed better than the Rosetta model.

关键词： fractal dimension soil water retention curve van Genuchten parameterization

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大学英语课程混合式教学模式研究

山西财经大学学报 2021年第S2期43卷 127-130页

作者：伊萌萌花拉锡林郭勒职业学院师范教育系内蒙古锡林浩特026000

在互联网技术飞速发展下,大学英语课程的教学正广泛的推广使用混合式教学模式,不仅提高了教师的教学效率,也提高了大学生的学习质量。因此,如何通过混合式教学模式进行英语教学课的有效结合,促进大学生对英语知识的掌握,是当前教学研究... 详细信息

在互联网技术飞速发展下,大学英语课程的教学正广泛的推广使用混合式教学模式,不仅提高了教师的教学效率,也提高了大学生的学习质量。因此,如何通过混合式教学模式进行英语教学课的有效结合,促进大学生对英语知识的掌握,是当前教学研究亟待解决的问题。

关键词：混合式教学模式大学英语教学教学质量

Taguchi approach to influence of processing parameters on erosive wear behaviour of Al7034-T6 composites

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Transactions of Nonferrous Metals Society of China 2017年第10期27卷 2163-2171页

作者： b.A.MUDASAR PASHA Kaleemulla MOHAMED Department of Mechanical Engineering GMIT Davanagere 577004 Karnataka India Department of Mechanical Engineering UBDTCE Davanagere 577004 Karnataka India

Taguchi technique was used to predict the influence of processing parameters on the erosive wear behavior Al7034-T6composite reinforced with SiC and Al2O3particles in different mass *** hybrid metal matrix composites(HMMCs)werefabricated by using a simple technique called stir casting *** electron microscope(SEM)was used to study thesurface morphology of the composite and its evolution according to processing *** design of experiment(DOE)based onTaguchi’s L16orthogonal array was used to identify various erosion *** most influencing parameter affecting the wear rate *** results indicate that erosion wear rate of this hybrid composite is greatly influenced more by filler content and impactvelocity respectively compared to other *** also shows the significant wear resistance with the increase in the filler contentsof SiC and Al2O3particles,respectively.

关键词： hybrid metal matrix composite erosive wear stir casting SiC Al2O3 Taguchi design

A Review on Graphene-based Nanomaterials in biomedical Applications and Risks in Environment and Health

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Nano-Micro Letters 2018年第3期10卷 164-197页

作者： Thabitha P.Dasari Shareena Danielle McShan Asok K.Dasmahapatra Paul b.Tchounwou RCMI Center for Environmental Health Jackson State University

Graphene-based nanomaterials(GbNs) have attracted increasing interests of the scientific community due to their unique physicochemical properties and their applications in biotechnology, biomedicine, bioengineering, disease diagnosis and therapy. Although a large amount of researches have been conducted on these novel nanomaterials, limited comprehensive reviews are published on their biomedical applications and potential environmental and human health effects. The present research aimed at addressing this knowledge gap by examining and discussing:(1) the history, synthesis,structural properties and recent developments of GbNs for biomedical applications;(2) GbNs uses as therapeutics,drug/gene delivery and antibacterial materials;(3) GbNs applications in tissue engineering and in research as biosensors and bioimaging materials; and(4) GbNs potential environmental effects and human health risks. It also discussed the perspectives and challenges associated with the biomedical applications of GbNs.

关键词： Graphene-based nanomaterials biomedical Delivery biosensors Tissue engineering bioimaging Health and environment risks

Influence of vanadium doping on the behavior of Yba_2Cu_3O_7-y

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Chinese Journal of Chemistry 1994年第5期12卷 419-424页

作者： MENG, Jian REN, Yu-Fang LI, Xiao-Guanglaboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, ChinaPopov, V.V. Repin, S.M. Smirnov, la. loffe Physicotechnical Institute, Russian Academy of Sciences, Saint Petersburg, Russia laboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun Jilin 130022 China Ioffe Physicotechnical Institute Russian Academy of Sciences Saint Petersburg Russia

Yba2Cu3-xVxO7-y(x=0, 0.1, 0.2, 0.3, 0.4, 0.5 and 0.6) superconductors have been prepared. X-ray diffraction shows that the system remains orthorhombic for all compositions studied, but for x > 0.4 V2O5 was detected as an impurity phase. Substitution of V5+ for Cu2+ occurs in the Cu(2) sites on the Cu(2)-O planes. The introduction of the high valence element, vanadium, produces the extra free-electrons. These electrons recombine with the positive carrier of the system. It makes depression of the mobility and the Hall number of Yba2Cu3-xVxO7-v and also results in a depression of TC.

关键词： Yba2Cu3O7-y high-Tc superconductor vanadium doping impurity effect.