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Evolution of Microstructure and Texture during Hot Deformation of a Commercially Processed Supral100

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Journal of Materials Science & Technology 2012年第6期28卷 531-536页

作者： v. Huang BCAST Brunel University Kingston Lane Uxbridge UB8 3PH UK

The microstructure and texture in a commercially processed AI-6 wt% Cu-0.4 wt% Zr （Suprall00） aluminium alloy have been investigated after annealing and hot tensile straining at 450℃, using a field emission gun scanning electron microscope （SEM） and electron backscatter diffraction （EBSD）. The microstructure of commercially processed alloy had a relatively large fraction of high angle grain boundaries （HAGBs） which were aligned parallel to the rolling direction, and a strong texture. Annealing at 450℃ led to an increase in the fraction of HAGBs and to an increase in HAGB spacing and these changes were progressively enhanced by subsequent tensile deformation. The increasing fraction of HAGBs was due to the annihilation of low angle grain boundaries （LAGBs）. A sharpening of texture during annealing was attributed to preferential textural growth, and the reduction of texture at higher tensile strains led to the development of superplastic behaviour. The present work supports the view that the evolution of the fine grain microstructure during the high temperature straining of SuprallO0 is primarily due to the accumulation of a large area of grain boundary during the initial thermomechanical processing, and does not involve any unusual restoration processes.

关键词： Aluminium Superplastic deformation Microstructure Texture Electronbackscatter diffraction

Plasma Treatment of Aluminum Using a Surface Barrier Discharge Operated in Air and Nitrogen: Parameter Optimization and Related Effects

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Plasma Science and Technology 2013年第8期15卷 794-799页

作者： v. PRYSIAZHNYI Masaryk University Faculty of ScienceDepartment of Physical Electronics

This paper presents the results of aluminum surface treatment by diffuse coplanar surface barrier discharge. The goals are to study the effectiveness of the plasma treatment and the dependence of its efficiency on operation parameters, such as sample-to-electrode distance, treatment time or gas atmosphere. Three types of aluminum materials （bricks, sheets and thin films） were tested to ensure the reliability of the treatment. The changes in the surface properties were characterized by the surface free energy, atomic force microscopy, attenuated total reflectance Fourier transform infrared spectroscopy （ATR FTIR） and X-ray photoelectron spec- troscopy （XPS）. The influence of aging effect on the treatment was also measured and discussed.

关键词： aluminum surface treatment plasma treatment

Influence of cobalt on performance of Cu-CeO2 catalysts for preferential oxidation of CO

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Journal of Rare Earths 2020年第9期38卷 941-950,I0001页

作者： Sachin Malwadkar Parthasarathi Bera C.v.v.Satyanarayana Catalysis Division CSIR-National Chemical LaboratoryPune 411008India Surface Engineering Division CSIR-National Aerospace LaboratoriesBengaluru 560017India

Copper and cobalt oxides supported on CeO2 were investigated for preferential oxidation of carbon monoxide(CO-PROX)in the presence of excess hydrogen and CO2.(Cuo)1-x(Co3 O4)x/3-(CeO2)2.5(x=0,0.25,0.50,0.75,0.85 and 1)catalysts were prepared by coprecipitation *** mixed oxide catalysts were characterized by several physicochemical techniques,such as BET surface area(SBET),X-ray diffraction(XRD),high resolution transmission electron microscopy(HRTEM),temperature programmed reduction(TPR)and X-ray photoelectron spectroscopy(XPS).XRD studies show the peaks related to CuO and Co3 O4 phases in copper and cobalt containing CeO2 *** average particle size of the CeO2 crystallites is in the range of 8-10 nm as evaluated from HRTEM *** studies demonstrate that Cu,Co and Ce in(cuO)1-x(Co3O4)x/3-(CeO2)2.5 catalysts are presented in+2 and+1,+3 and+2 and+4 and+3 oxidation states,*** catalyst with x=0.75 shows better activity and selectivity towards *** the catalyst with only copper(CuO-CeO2,x=0)shows good activity but reverse water gas shift(RWGS)reaction is noticed at high *** the other hand,RWGS reaction is suppressed on the cobalt containing CuO-ceO2 *** on CeO2 with x=1 shows hardly any activity for PRoX reaction at low *** methanation activity is observed on CuO-CeO2 or Co3O4-CeO2 *** contrast,combination of copper and cobalt on CeO2 shows methanation of CO where enhanced activity is observed with increasing in cobalt content.

关键词： CO-PROX Cu-CeO2 XRD XPS Methanation H2O addition

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中俄Z-pinch联合实验新进展

物理学报 2011年第4期60卷 400-405页

作者：徐荣昆李正宏杨建伦丁宁周秀文蒋世伦章法强王真许泽平宁家敏李林波 E.v.Grabovsky G.M.Oleynic v.v.Alexandrov v.P.smirnov 核物理与化学研究所绵阳621900 北京应用物理与计算数学研究所北京100094 中国工程物理研究院激光与聚变研究中心绵阳621900 Troitsk Institute for Innovation and Thermonuclear Researches Troitsk 142190Russia

在Angara-5-1装置Z-pinch实验中,研究了双层丝阵内爆动力学模式和动态黑腔,获得高产额X射线辐射能量和功率,X射线辐射功率达5.6TW,泡沫X射线辐射温度达63ev,本文给出主要实验设计方法和结果.

关键词： Z箍缩双层丝阵 X射线辐射动态黑腔

Using isotope methods to study alpine headwater regions in the Northern Caucasus and Tien Shan

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Frontiers of Earth Science 2017年第3期11卷 531-543页

作者： E. RETS J. CHIZHOvA N. LOSHAKOvA I. TOKAREv M. KIREEvA N. BUDANTSEv Yu.K. vASILCHUK N. FROLOvA v. POPOvNIN P. TOROPOv E. TERSKAYA A. smirnov E. BELOZEROv M. KARASHOvA Water Problems Institute Russian Academy of Sciences ul. Gubkina 3 Moscow 119333 Russia Faculty of Geography Lomonosov Moscow State University Moscow 119991 Russia Center for Geo-Environmental Research and Modelling (GEOMODEL) at St. Petersburg University St. Petersburg 198504 Russia

High mountain areas provide water resources for a large share of the world＇s population. The ongoing deglaciation of these areas is resulting in great instability of mountainous headwater regions, which could significantly affect water supply and intensify dangerous hydrological processes. The hydrological processes in mountains are still poorly understood due to the complexity of the natural conditions, great spatial variation and a lack of observation. A knowledge of flow-forming processes in alpine areas is essential to predict future possible trends in hydrological conditions and to calculate river runoff characteristics. The goal of this study is to gain detailed field data on various components of natural hydrological processes in the alpine areas of the North Caucasus and Central Tien Shan, and to investigate the possibility that the isotopic method can reveal important regularities of river flow formation in these regions. The study is based on field observations in representative alpine river basins in the North Caucasus （the Dzhankuat river basin） and the Central Tien Shan （the Chon-Kyzyl-Suu river basin） during 2013-2015. A mixing-model approach was used to conduct river hydrograph separation. Isotope methods were used to estimate the contribution of different nourishment sources in total runoff and its regime. ~80, ~D and mineralization were used as indicators. Two equation systems for the study sites were derived： in terms of water routing and runoff genesis. The Dzhankuat and Chon-Kyzyl-Suu river hydrographs were separated into 4 components： liquid precipitation/meltwaters, surface routed/subsurface routed waters.

关键词： isotope methods mountain hydrology hydro-graph separation Dzhankuat river Chon-Kyzyl-Suu river,field data

Bending sensor based on flexible spin valve

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Chinese Physics B 2023年第5期32卷 655-661页

作者： L I Naumova R S Zavornitsyn M A Milyaev N G Bebenin A Y Pavlova M v Makarova I K Maksimova v v Proglyado A A Zakharov v v Ustinov M.N.Miheev Institute of Metal Physics Ural BranchRussian Academy of SciencesS.Kovalevskoi Street 18Ekaterinburg 620990Russia

Flexible spin valves were prepared by magnetron sputtering on polyimide substrates. The buffer layer that reduces significantly the effect of the polymer substrate on the spin valve microstructure and magnetoresistive properties was revealed. Bending deformation was applied to the microobjects based on the flexible spin valves in parallel to anisotropy axes. It was revealed that during the bend the magnetoresistance changes due to the joint impact of both the change of the magnetic field projection on the film plane and the change of the magnetic properties of the ferromagnetic layers. The obtained dependences have been used in construction of bending sensor, in which the flexible spin valve microstripes were united into the Wheatstone bridge.

关键词： spin valve polymer substrate magnetostriction magnetic anisotropy

On the possible ultrasonic inspection of micro-bubbles generated by the optical fiber tip

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Journal of Innovative Optical Health Sciences 2016年第5期9卷 22-29页

作者： v.v.Kazakov A.G.Sanin v.A.Kamensky Institute of Applied Physics of the Russian Academy of Sciences 46 Ul'yanov Street 603950Nizhny NovgorodRussia

We demonstrate the possibility of detection and monitoring of bubbles emerging near the tip of an optical fiber by means of ultrasonic *** excitation of bubbles at their resonant frequencies is performed using short ultrasonic pulses having a wide frequency range simulta-neously with their modulation by means of a long pulse of a monochromatic *** method allows detection of bubbles of various *** signal processing method,which allows increased bubble detection accuracy,is proposed for ressearch in envir onments of biological-like medium which show continuous variations in structure and properties when exposed to optical *** method has been demonstrated on model objects:in a liquid and in a biological tissue phantom using various methods of bubble generation(hydrolysis and optical enission).We studied bubble formation by the tip of a fiber of the surgical laser LSP-007/10 "IRE Polus"with a wavelength of 0.97μm coated with a highly absorbing graphite layer.

关键词： Bubble generation ultrasonic inspection of bubbles subharmonic ultrasound modulation laser surgery.

Evaluation of the energy efficiency of rotary percussive drilling using dimensionless energy index

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第5期14卷 1486-1500页

作者： v.N.Oparin v.N.Karpov v.v.Timonin A.I.Konurin Chinakal Institute of Mining Siberian BranchRussian Academy of SciencesKrasnyi Prospect 54Novosibirsk630091Russia

This paper sets forth a geomechanics framework for assessing the energy efficiency of rotary percussive drilling using the energy criterion, which has been proposed by victor Oparin for volumetric destruction of high-stress rocks having nonuniform physico-mechanical properties. We review the long-term research and development in the specified area of science and technology, including research and development projects implemented at the Institute of Mining, Siberian Branch of the Russian Academy of Sciences. A new modified expression of Oparin’s dimensionless energy criterion of volumetric rock destruction k is introduced. The range of in situ values is determined for the energy criterion of volumetric rock destruction at the optimized energy efficiency of rotary percussive drilling. The temporospatial intervals of geotechnical monitoring are found to control pneumatic drilling energy efficiency at subsoil use objects in Russia. The integrated experimental, theoretical and geotechnical approach to the comprehensive investigation of real-time processes of rock fracture in rotary percussive drilling using the energy concept possesses the necessary geomechanical performance-and-technology potential to create the next level geotechnical monitoring of drilling systems for various purposes, including determination of physico-mechanical properties and the stress-strain analysis of rock mass in full-scale drilling.

关键词： Rotary percussive drilling Geotechnical monitoring Drilling machine Energy criterion Energy efficiency

Synthesis of RE-Ag,Al-RE-doped sol-gel glass and films for solar cells

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Journal of Rare Earths 2009年第4期27卷 671-674页

作者： A.v.Semchenko v.v.Sidsky v.Е.Gaishun D.L.Kovalenko W.Strek Francisk Skorina Gomel State University 246019 Sovetskaya st.104 Gomel Belarus Institute of Low Temperature and Structures Research PAN Okolna st.2 Wroclaw Poland

The paper dealt with the study of fluorescence properties of sol-gel systems doped with rate-earth ions and co-doped with silver. The general problem for these types of inorganic phosphors was a very low absorbance in the visible range. Therefore, a sensitizer of luminescence of the rare-earth ions should be selected and used. The sensitizer should possess a good absorbance in the visible range and strong interaction with the rare-earth ions. In this study silver ions were selected as the sensitizer.

关键词： sol-gel method sol-gel glass and film luminescence and its amplification rare-earth ions silver ions energy transfer