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Cu-20%Fe粉末异步轧制有限元模拟及工艺参数影响规律

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材料导报 2024年第3期38卷 196-202页

作者：张宏吉彭文飞李贺邵熠羽 Moliar oleksandr 宁波大学机械工程与力学学院浙江宁波315211 宁波大学浙江省零件轧制成形技术研究重点实验室浙江宁波315211

为研究高铁含量铜铁粉末异步轧制的成形规律及合理选取工艺参数,应用Shima-Oyane屈服准则,在***有限元软件中建立粉末轧制有限元模型,通过实验验证了该模型的有效性。利用仿真结合轧制实验方法分析了异速比、压下率、轧制速度、轧辊直... 详细信息

为研究高铁含量铜铁粉末异步轧制的成形规律及合理选取工艺参数,应用Shima-Oyane屈服准则,在***有限元软件中建立粉末轧制有限元模型,通过实验验证了该模型的有效性。利用仿真结合轧制实验方法分析了异速比、压下率、轧制速度、轧辊直径及辊面摩擦系数等工艺参数对生坯相对密度和轧制力的影响规律。结果表明:相较于粉末对称轧制,采用异步的方式能显著减小轧制力,提高生坯密度分布均匀性;过大的压下率和轧辊直径分别会对生坯造成边裂和缠辊等不良影响,过低的压下率和摩擦系数导致生坯不能顺利轧制成形。实验结果与有限元模拟结果相符,相对密度模拟结果最大误差为3.89%,轧制力模拟结果最大误差为9.49%,研究结果对铜铁粉末异步轧制成形工艺优化有较好的借鉴价值。

关键词：铜铁粉末异步轧制有限元模拟相对密度轧制力

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Nonlinear Rydberg exciton-polaritons in Cu2O microcavities

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Light(Science & Applications) 2024年第4期13卷 619-627页

作者： Maxim Makhonin Anthonin Delphan Kok Wee Song Paul Walker Tommi Isoniemi Peter Claronino Konstantinos Orfanakis Sai Kiran Rajendran Hamid Ohadi Julian Heckötter Marc Assmann Manfred Bayer Alexander Tartakovskii Maurice Skolnick oleksandr Kyriienko Dmitry Krizhanovskii Department of Physics and Astronomy University of SheffieldSheffield S37RHUK. Department of Physics and Astronomy University of ExeterStocker RoadExeter EX44PYUK. SUPA School of Physics and AstronomyUniversity of St AndrewsSt Andrews KY169SSUK. Fakultät Physik TU DortmundAugust-Schmidt-Straße 444227 DortmundGermany

Rydberg excitons(analogues of Rydberg atoms in condensed matter systems)are highly excited bound electron-hole states with large Bohr *** interaction between them as well as exciton coupling to light may lead to strong optical nonlinearity,with applications in sensing and quantum information ***,we achieve strong effective photon–photon interactions(Kerr-like optical nonlinearity)via the Rydberg blockade phenomenon and the hybridisation of excitons and photons forming polaritons in a Cu2O-filled *** pulsed resonant excitation polariton resonance frequencies are renormalised due to the reduction of the photon-exciton coupling with increasing exciton *** analysis shows that the Rydberg blockade plays a major role in the experimentally observed scaling of the polariton nonlinearity coefficient as∝n4.4±1.8 for principal quantum numbers up to n=*** high principal quantum numbers studied in a polariton system for the first time are essential for realisation of high Rydberg optical nonlinearities,which paves the way towards quantum optical applications and fundamental studies of strongly correlated photonic(polaritonic)states in a solid state system.

关键词： density Rydberg polar

热处理对新型Ti-6Al-2Mo-2V-3Nb-2Fe-1Zr合金力学性能的影响

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材料研究学报 2024年第7期38卷 519-528页

作者：彭文飞黄巧东 Moliar oleksandr 董超琪汪小锋宁波大学机械工程与力学学院宁波315211 宁波大学浙江省零件轧制成形技术研究重点实验室宁波315211 宁波大学冲击与安全工程教育部重点实验室宁波315211

研究了固溶、固溶+单级时效和固溶+双级时效三种热处理制度对Ti-6Al-2Mo-2V-3Nb-2Fe-1Zr合金的微观组织和力学性能的影响。结果表明,这种合金热处理前的组织为双态组织,由初生α_(p)相、次生α_(s)相和β相组成,其中初生α_(p)相的体积... 详细信息

研究了固溶、固溶+单级时效和固溶+双级时效三种热处理制度对Ti-6Al-2Mo-2V-3Nb-2Fe-1Zr合金的微观组织和力学性能的影响。结果表明,这种合金热处理前的组织为双态组织,由初生α_(p)相、次生α_(s)相和β相组成,其中初生α_(p)相的体积分数为22%,次生α_(s)相的体积分数为21%;在双相区固溶后,合金原来的热轧态α_(p)和α_(s)相部分转变为β相,其组织由亚稳β相、等轴状初生α_(p)相和粗大片状的次生α_(s)相组成;单级时效后,β相中析出了大量均匀分布的纳米细针状次生α_(s)相;双级时效后α相的体积分数显著提高,随着时效时间的增加初生α相和次生α相的晶粒尺寸逐渐增大。准静态拉伸实验结果表明,与热轧态试样相比双相区固溶态试样的延伸率显著提高,但是屈服强度明显降低;单级时效后试样的强度显著提高,强度-塑性平衡更佳;与热轧态试样相比,双级时效后试样的延伸率有所降低,随着时效时间的增加合金的强度降低而延伸率提高。用加工硬化率曲线解释了不同热处理的钛合金应变硬化率的变化趋势,并基于实验结果拟合了修正的Hall-Petch模型,与实验结果吻合较好。

关键词：金属材料 α+β钛合金热处理微观组织力学性能

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Newly identified Au-Ag-Bi-Te mineralization in the Aydindere skarn Fe and Cu deposit， Giresun， NE Turkey: implications of gold mineralization during retrograde skarn evolution

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Journal of Earth Science 2024年

作者： Ahmet Sasmaz Vitaliy Sukach Serhiy Bondarenko Hryhorii Aleksiienko Hengameh Erfanian Kaseb Bilge Sasmaz Sergiy Kurylo oleksandr Hrinchenko Volodymyr Somka Panagiotis Voudouris Department of Geology Firat University Faculty of Geology and Geoenvironment National and Kapodistrian University of Athens Mineralogy and Ore Formation of National Academy of Science M.P.Semenenko Institute of Geochemistry 3. Department of Petroleum Engineering Eqbal Lahoori Institute of Higher Education

This study investigates the mineralogy and mineral-chemistry of a newly discovered Au-Ag-Bi-Te mineralization at the Aydindere Fe-Cu skarn deposit， within the Pontides Tectonic Unit， northeastern Turkey. The mineralization is developed in the skarn zone at the contact between Upper Cretaceous andesite-pyroclastic rocks and a Paleocene-Eocene I-type granitoid. The principal ore minerals of the Aydindere Fe-Cu deposit are oxides (magnetite)， sulfides (pyrite-chalcopyrite-galena-sphalerite)， tellurides/sulfotellurides (tetradymite， hessite)， sulfosalts (wittichenite， emplectite， aikinite) and native gold-electrum. Skarn minerals include anhydrous phases (garnet) formed in a prograde stage and hydrous phases (amphibole， epidote， chlorite)， which were formed in a retrograde stage in association with quartz， adularia， apatite and late calcite. Sulfides， tellurides and sulfosalts are introduced during the retrograde stage. The Au-Ag-Bi-Te mineralization was detected for the first time within the western ore body of the Aydindere deposit， and occurs in calcite-bearing sulfide bodies that cut magnetite-garnet-amphibole-epidote skarns with magnetite ores of different grade， including massive magnetite. Chlorite geothermometry indicates formation of the Au-Ag-Bi-Te mineralization at temperatures between 300 and 250 °C， during the retrograde skarn evolution. Assuming the temperature is ～275°C， logfS2= -10.5 to -13， logfO2= -37 to -33， and logfTe2values range from approximately -12 to -8.5 were estimated. The available mineralogical and geological data (presences of magnetite， oxidized-type tellurides/sulfotellurides， and andraditic garnets， and absence of pyrrhotite and arsenopyrite) suggest that Aydindere is an oxidized Au-bearing skarn deposit. The discovery of Au-Ag-Bi-Te mineralization at Aydindere increases its productivity and requires more detailed exploration in the deposit for precious (Au， Ag) and critical (Bi， Te) metals.

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Electrochemical Synthesis of Chromium Silicides from Molten Salts

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Journal of Chemistry and Chemical Engineering 2014年第9期8卷 845-848页

作者： Liliia Molotovska Dmytro Shakhnin oleksandr podyman Viktor Malyshev Nataliya Uskova Viliam Pavlik Vernadsky Institute of General and Inorganic Chemistry of the NAS (National Academy of Science) of Ukraine Kiev 03142Ukraine Institute of lnorganic Chemistry Slovak Academy of Sciences Bratislava 994536 Slovak Republic

Electrochemical synthesis of chromium silicides from NaCl-KCl-K2SiF6-CrF3 system has been investigated by cyclic voltammetry and DC (direct current) electrolysis at 850 oC. The process of Cr and Si joint electroreduction in chloride-fluoride melt proceeds in one stage in a kinetic mode. The cathode product was analyzed using XRD (X-ray diffraction) method. XRD data have confirmed that Cr3Si is the dominant phase. SEM (scanning electron microscopy) results have shown that Cr3Si powder samples consist of 50-150 μm particles and that tungsten silicide was formed at the surface of tungsten cathode after chrome-free system electrolysis.

关键词：电化学合成硅化物铬系扫描电子显微镜 X射线衍射 Cr3Si 熔盐循环伏安法

CCD/EMCCD光电参数测试系统的设计与应用

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中国光学（中英文） 2024年第3期17卷 693-703页

作者：沈吉 VIACHESLAV V.Zabudsky 常维静那启跃简云飞 OLEG V.Rikhalsky oleksandr G.Golenkov VOLODYMYR P.Reva 华东光电集成器件研究所江苏苏州215263 乌克兰科学院V.E.Lashkaryov半导体物理研究所乌克兰基辅01001 乌克兰科学院Bogomoletz生理学研究所乌克兰基辅01001

本文开发了一种用于测量CCD和EMCCD(电子倍增CCD)芯片光电参数的测试系统。该测试系统通过自动模式或手动模式间的切换,测量器件的暗电流、读出放大器的响应度、电荷转移效率、电荷容量和其他参数。该测试系统可以针对不同规格和结构的C... 详细信息

本文开发了一种用于测量CCD和EMCCD(电子倍增CCD)芯片光电参数的测试系统。该测试系统通过自动模式或手动模式间的切换,测量器件的暗电流、读出放大器的响应度、电荷转移效率、电荷容量和其他参数。该测试系统可以针对不同规格和结构的CCD/EMCCD器件,实现CCD晶圆或封装好的成品的参数测试,实现576×288、640×512、768×576、1024×1024、1280×1024 CCD/EMCCD的测试和筛选。

关键词： CCD EMCCD 测试系统光电参数

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Energy Engineering 2022年第1期119卷 103-121页

作者： oleksandr Kovalko Tatiana Eutukhova oleksandr Novoseltsev Naftogaz of Ukraine Kyiv01601Ukraine Interregional Academy of Personnel Management Kyiv02000Ukraine Institute of Engineering Thermophysics Kyiv03057Ukraine

The transition to low-carbon development has been recognized as one of the most important directions for the transformation of national economies in most *** we can identify two of the most common service-oriented logical models of this *** are models of Service-Dominant Logic and Product-Service Systems that are used in this study to create a service-oriented platformfor stimulating business development in the field of energy-related(ER)*** establishment of such a platform is being considered based on the conceptual provisions of the global business *** a platform has been found to be a powerful tool for systemic coordinated cooperation between actors in the ER-services market and the relevant actors in the energy sector as well as in other industrial markets,unleashing the benefits of synergies,resulting from such *** logical models of attracting energy services companies to the creation of virtual communities(centers)for large-scale implementation of measures in the field of energy efficiency and renewable energy sources are presented in *** advantages of the practical implementation of logicalmodels are confirmed by calculations performed onmathematicalmodel adapted for engineering use in the field of ER-services.

关键词： Energy services market service-oriented logic performance contracting

Evaluation of airlift pump performance for vertical conveying of coal particles

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International Journal of Coal Science & Technology 2023年第3期10卷 155-166页

作者： Parviz Enany oleksandr Shevchenko Carsten Drebenshtedt Faculty of Mining and Special Civil Engineering Technische Universitat BergakademieGustav-Zeuner StraBe 1A09599 FreibergGermany UTF GmbH ErzstraBe 1509618 Brand-ErbisdorfGermany

One of the crucial aspects of reducing air consumption when conveying particles with an airlift pump is to know the factors that affect the process of particle motion at an initial velocity of *** determine the influence of submer-gence ratio and physical properties of particles(such as size,shape,and mass)on the onset of vertical particle motion,the airlift pump was taken as the research object,and spherical glass together with irregular shaped coal were used as experimental test *** results show that unlike the water-solid environment,the start of particle motion in the water-air mixture does not always occur at a certain value of superficial water velocity and this value also increases with increasing submergence *** the parameters considered,the role of submergence ratio is much more effective than the dimensions and the shape of the particle,because by increasing submergence from 0.3 to 0.8,it is possible to reduce air consumption by up to 8 *** on this study the corresponding theoretical model derived by Fujimoto et *** optimized,wherein the overall agreement between the modified theory and present experimental data is particularly *** to Fujimoto,the minimum superficial water velocity for lifting solids in the air-water mixture is not always smaller than water ambient which indicates on optimum submergence ratio higher than ***,a new criterion was introduced to describe the moment of onset of the particle motion as a function of the superficial fluid velocity ratio for each submergence value.

关键词： Air-water-solid flow Slurry- Coal Submergence ratio Taylor bubble Superficial velocity

Features of hardware implementation of quasi-continuous observation devices with discrete receivers

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Visual Computing for Industry,Biomedicine,and Art 2022年第1期5卷 71-77页

作者： oleksandr Maryliv Mykhailo Slonov Military-Diplomatic Academy named after Eugene Bereznyak Kyiv 04050Ukraine

This article proposes an approach to the formalization of tasks and conditions for the hardware implementation of quasi-continuous observation devices with discrete receivers in remote sensing *** devices with a matrix are used in medicine,ecology,aerospace photography,and geodesy,among other *** the discrete receivers,the sampling of an image in the matrix receiver into pixels leads to a decrease in the spatial information of the *** a greater extent,these disadvantages can be avoided by using photosensitive matrix with a regularly changing(controlled)density of elementary receivers-matrix(RCDOER-matrix).Currently,there is no substantiation of the tasks and conditions for the hardware implementation of *** algorithmic formation of a quasi-continuous image of observation devices with the RCDOER-matrix is *** algorithm used a formal pixel-by-pixel description of the signals in the *** algorithm formalizes the requirements for creating a photosensitive RCDOER-matrix of a certain size,as well as for changing the mechanism for forming and saving a frame with observation *** application of the developed method will allow multiplying the pixel size of the image relative to the pixel size of the *** algorithms for RCDOER-matrix are supplemented by formalizing the tasks that arise when creating *** addition,the conditions for hardware implementation are proposed,which ensure the completeness of registration of the observation picture,and allow avoiding excessive pixel ***,the results of the research carried out approximate the practical application of RCDOER-matrix.

关键词： Discrete receivers Formalization of tasks Conditions of hardware implementation