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IN SITU TEM OBSERVATION OF AMORPHOUS Nd_(x)Fe_(1-x)THIN FIlMS AND THEIR CRYSTAllIZATION

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Acta Metallurgica Sinica(English letters) 1993年第11期6卷 387-392页

作者： lÜ Manqi WAGENDRISTEl A State Key laboratory of Rapidly Solidified and Non-Equilibrium Alloys International Centre for Meterials PhysicsInstitute of Metal ResearchAcademia SinicaShenyangChina Institut fur Anwend Physik Technische Universitat in WienAustria

The room temperature stability and crystallization of amorphous Nd_xFe_(1-x)thin films with x=0.06—0.90,prepared by flash evaporation at 77 K,were investigated by X-ray diffraction and TEM *** amorphous Nd_xFe_(1-x)films are stable at room temperature when 0.19long the surface of film as very thin flakes and become thick only at relatively high *** complete crystallization,the Nd_xFe_(1-x)films with xl Nd,but no NdFe2,a phase expected to occur by phase diagram.

关键词： amorphous film Nd-Fe film crystallization

The evolution and refinements of varicocele surgery

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Asian Journal of Andrology 2016年第2期18卷 171-178,J0002页

作者： Joel l Marmar Director of Men's Health Services Planned Parenthood of Southern New Jersey 317 S. Broadway Camden NJ 08103 USA.

Varicoceles had been recognized in clinical practice for over a century. Originally, these procedures were utilized for the management of pain but, since 1952, the repairs had been mostly for the treatment of male infertility. However, the diagnosis and treatment of varicoceles were controversial, because the pathophysiology was not clear, the entry criteria of the studies varied among centers, and there were few randomized clinical trials. Nevertheless, clinicians continued developing techniques for the correction of varicoceles, basic scientists continued investigations on the pathophysiology of varicoceles, and new outcome data from prospective randomized trials have appeared in the world＇s literature. Therefore, this special edition of the Asian Journal of Andrology was proposed to report much of the new information related to varicoceles and, as a specific part of this project, the present article was developed as a comprehensive review of the evolution and refinements of the corrective procedures.

关键词： antegrade sclerosis laparoscopic varicocelectomy microsurgical varicocelectomy percutaneous embolization varicocelectorny

Hua's Theorem on Five Almost Equal Prime Squares

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Acta Mathematica Sinica,English Series 2006年第3期22卷 907-916页

作者： Guang Shi l Department of Mathematics Shandong University

In this paper we sharpen Hua＇s result by proving that each sufficiently large integer N congruent to 5 modulo 24 can be written as N=p1^2＋p2^2＋p3^2＋p4^2＋p5^2,with │pj-√N/5│≤U=N^1/2-1/28＋ε,where pj are primes.

关键词： Additive theory of prime numbers Circle method iterative method

A Pooling Method Developed for Use in Convolutional Neural Networks

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Computer Modeling in Engineering & Sciences 2024年第10期141卷 751-770页

作者： Ìsmail Akgül Departmant of Computer Engineering Faculty of Engineering and ArchitectureErzincan Binali Yıldırım UniversityErzincan24002Turkiye

In convolutional neural networks,pooling methods are used to reduce both the size of the data and the number of parameters after the convolution of the *** methods reduce the computational amount of convolutional neural networks,making the neural network more *** pooling,average pooling,and minimum pooling methods are generally used in convolutional neural ***,these pooling methods are not suitable for all datasets used in neural network *** this study,a new pooling approach to the literature is proposed to increase the efficiency and success rates of convolutional neural *** method,which we call MAM(Maximum Average Minimum)pooling,is more interactive than other traditional maximum pooling,average pooling,and minimum pooling methods and reduces data loss by calculating the more appropriate pixel *** proposed MAM pooling method increases the performance of the neural network by calculating the optimal value during the training of convolutional neural *** determine the success accuracy of the proposed MAM pooling method and compare it with other traditional pooling methods,training was carried out on the leNet-5 model using CIFAR-10,CIFAR-100,and MNIST *** to the results obtained,the proposed MAM pooling method performed better than the maximum pooling,average pooling,and minimum pooling methods in all pool sizes on three different datasets.

关键词： Pooling convolutional neural networks deep learning

Modeling and Simulation of the Microstructure Evolution during a Cooling of Immiscible Alloys in the Miscibility Gap

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Journal of Materials Science & Technology 2002年第3期18卷 197-205页

作者： JiuzhouZHAO l.Ratke 等 TheInstituteofMetalResearch ChineseAcademyofSciencesShenyang110016China TheInstituteforSpaceSimulation DLRD-511470CologneGermany

The microstructure development during a cooling period of alloys being immiscible in the liquid state such as Al-Pb or AI-Bi has gained renewed scientific and technical interest during the last decades. Experiments have been performed to investigate the phase transformation kinetics in the liquid miscibility gap and numerical models have been developed to simulate and analyze the solidification process. The recently developed computational modeling techniques can, to some extent, be applied to describe the decomposition, the spatial phase separation and the microstructure evolution during a cooling period of an immiscible alloy through the miscibility gap. This article overviews the researches in this field.

关键词： Immiscible alloy Solidification Microstructure Modeling

Application of Argan plant extract as green corrosion inhibitor for steel in 1 mol/l HCl

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Acta Metallurgica Sinica(English letters) 2012年第1期25卷 10-18页

作者： l. Afia R. Salghi l. Bammou lh. Bazzi B. Hammouti l. Bazzi laboratory of Environmental Engineering and Biotechnology ENSA University Ibn Zohr PO Box 1136 80000 Agadir Morocco laboratory of Establishment of Autonomous Control and Coordination of Export 80000 Agadir Morocco lCAE-URAC 18 Faculty of Science University of Mohammed Premier PO Box 717 60000 Oujda Morocco laboratory of Materials & Environment Faculty of Science University Ibn Zohr BP 8106 80000 Agadir Morocco

The effect of Argan plant extract （APE） on the corrosion of the steel in hydrochloric acid medium was studied using gravimetric, electrochemical polarization and impedance spectroscopy （EIS） measurements. Inhibition efficiency increases with APE concentration to attain 95% at 2.5 g/l. We note good agreement between gravimetric and electrochemical methods （potentiodynamic polarization and EIS）. Effect of temperature is also made in the 298-328 K range. Polarization measurements show also that APE act as a mixed inhibitor. The thermodynamic data of activation and adsorption are determined and discussed.

关键词： Corrosion Steel Inhibition Argan plant extract Adsorption Kinetic parameter

Tensile and cyclic deformation response of friction-stir-welded dissimilar aluminum alloy joints:Strain localization effect

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Journal of Materials Science & Technology 2021年第14期73卷 91-100页

作者： P.l.Niu W.Y.li D.l.Chen State Key laboratory of Solidification Processing Shaanxi Key Laboratory of Friction Welding TechnologiesNorthwestern Polytechnical UniversityXi'an710072.China Department of Mechanical and Industrial Engineering Ryerson University350 Victoria StreetTorontoOntarioM5B2K3Canada

Cyclic deformation behavior of friction-stir-welded dissimilar AA2024-T351 to AA7075-T65 aluminum alloy joints was evaluated via stepwise tests at different strain rates,along with transmission electron microscopy examinations to characterize the precipitates required to assess internal *** backscatter diffraction was employed to observe the inhomogeneous microstructures of the FSWed *** localization appeared in the heat affected zone(HAZ)of AA2024 *** cyclic deformation of 500 cycles at a total strain amplitude of 0.5%,the strength of the dissimilar joints resumed basically to that of AA2024 base *** the AA2024 HAZ was obviously hardened,which should be attributed to the introduced dislocations during cyclic deformation *** hardening capacity of the joints increased with decreasing strain rate.

关键词： Friction stir welding Dissimilar aluminum alloys Strain localization Cyclic hardening Slip irreversibility

Spatiotemporal assessment of particulate matter(PM_(10) and PM_(2.5)) and ozone in a Caribbean urban coastal city

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Geoscience Frontiers 2022年第1期13卷 437-445页

作者： Ana l.Duarte Ismael l.Schneider Paulo Artaxo Marcos l.S.Oliveira Department of Civil and Environmental Universidad de la CostaCalle 58#55-66080002 BarranquillaAtlánticoColombia Instituto de Física Universidade de São PauloSão PauloBrazil Universidad de lima Avenida Javier Prado Este 4600Santiago de Surco 1503Peru

Air pollution has become a critical issue in urban areas,so a broad understanding of its spatiotemporal characteristics is important to develop public *** study analyzes the spatiotemporal variation of atmospheric particulate matter(PM_(10) and PM_(2.5))and ozone(O_(3))in Barranquilla,Colombia from March 2018 to June 2019 in three monitoring *** average concentrations observed for the Móvil,Policía,and Tres Avemarías stations,respectively,for PM_(10):46.4,51.4,and 39.7μg/m^(3);for PM_(2.5):16.1,18.1,and 15.1μg/m^(3) and for O_(3):35.0,26.6,and 33.6μg/m^(3).The results indicated spatial and temporal variations between the stations and the pollutants *** highest PM concentrations were observed in the southern part of the city,while for ozone,higher concentrations were observed in the *** variations are mainly associated with the influence of local sources in the environment of each site evaluated as well as the meteorological conditions and transport patterns of the study *** study also verified the existence of differences in the concentrations of the studied pollutants between the dry and rainy seasons and the contribution of local sources as biomass burnings from the Isla Salamanca Natural Park and long-range transport of dust particles from the Sahara *** study provides a scientific baseline for understanding air quality in the city,which enables policy makers to adopt efficient measures that jointly prevent and control pollution.

关键词： Particulate matter Ozone Colombian Caribbean Coastal urban area

Influence of austenization temperature on the erosion behavior of austempered ductile irons

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Journal of University of Science and Technology Beijing 2008年第1期15卷 29-33页

作者： l.C. Chang l C. Hsui l.H. Chen S.T. lui Department of Mechanical Engineering Technology and Science Institute of Northern Taiwan Taipei 112 China Talpei Department of Materials Science and Engineering Cheng-Kung University Talnan 800 China Taipei

The erosion behavior of austempered ductile irons austenized at different temperatures was studied. The results indicate that the erosion rate well correlates with the mechanical properties. At high impact angles, increasing ductility and mechanical energy density results in decreasing erosion rate, whereas increasing hardness reduces the erosion rate at low impact angles. 2008 University of Science and Technology Beijing. All rights reserved.

关键词： austempered ductile iron erosion mechanical properties austenization