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排序方式: 共有190条查询结果,搜索用时 15 毫秒
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I. A. Sviridov L. M. Kubalova O. Ya. Vasil’eva V. I. Fadeeva 《Inorganic Materials》2006,42(8):867-871
We have investigated solid-state reactions in an equiatomic mixture of Fe and Ge powders during ball milling in a water-cooled high-energy mill under an argon atmosphere. The mechanical alloying products have been characterized by x-ray diffraction, Mössbauer spectroscopy, and calorimetry. The observed sequence of phase formation correlates with the thermodynamic properties of the iron germanides involved. The alloy prepared by ball milling for 2 h consists entirely of nanocrystallites (?15 nm) of the low-temperature, stable, cubic (B20) phase of FeGe. 相似文献
4.
Ermittlung von Verfahrensgrenzen für das Fügen durch Knickbauchen anhand des Werkstoffes E235+N 下载免费PDF全文
B. Viehweger A. Sviridov P. Grützner B.‐A. Behrens A. Bouguecha A. Almohallami 《Materialwissenschaft und Werkstofftechnik》2015,46(8):804-812
Through a systematic approach and the consistent comparison of the results between experimental and numerical investigations, a deep understanding of the bulging mechanisms has been first developed. From these investigations process limitations were derived and presented in the form of a working diagram for the material E235+N. With regard to a wide industrial use of upset bulging as a joining technology, a technologically, productively as well as economically appropriate method could be developed and validated by means of practical and numerical experiments. 相似文献
5.
V. V. Ammosov O. P. Gavrishchuk V. A. Gapienko V. G. Zaets N. A. Kuz’min Yu. M. Sviridov A. A. Semak S. Ya. Sychkov E. A. Usenko A. I. Yukaev 《Instruments and Experimental Techniques》2010,53(2):175-179
A 6-gap glass resistive plate chamber with a strip readout was tested on the beam of the U-70 accelerator at the Institute
for High Energy Physics. A time resolution of ∼45 ps was attained at an efficiency of >98%. The position resolution along
a strip was estimated to be ∼1 cm. 相似文献
6.
A model of seasonal heat storage by lake sediments is proposed oriented at applications in climate modeling and at lake parameterization in numerical weather prediction. The computational efficiency is achieved by reformulating of the heat transfer problem as a set of ordinary differential equations for evolution of the temperature wave inside the upper sediment layer. Arising temperature and depth scales completely replace the conductivity of the sediment in the heat transfer equation and can be easily achieved from the lake water temperature observations without any data on the sediment thermal properties. The method is proposed for the scales estimation from the inverse solution of the model equations in special case of the constant water-sediment heat flux in ice-covered lakes. The method is tested on data from sediments of Lake Krasnoye, North-Western Russia. The long-term (1961–2002) modeling of temperature in German lakes Müggelsee and Heiligensee with a coupled one-dimensional model of lake water column and sediments has demonstrated an appreciable effect of the sediment heat storage on near-bottom temperatures in both lakes. Thus, incorporation of the sediment layer into lake temperature models can essentially improve, at low computational costs, the model performance, especially for shallow lakes. In addition, a better forecast of near-bottom temperature evolution on climatic scales can provide a better understanding of the response of lake benthic communities to global warming. 相似文献
7.
Zimnyakov DA Agafonov DN Sviridov AP Omel'chenko AI Kuznetsova LV Bagratashvili VN 《Applied optics》2002,41(28):5989-5996
Measurements of the contrast value of time-averaged speckle-modulated images of cartilage tissue are used to study tissue thermal modification in the case of laser-light treatment. This modification is related to thermally induced internal stress relaxation in the matrix of the treated tissue. The specific feature of the evolution of time-averaged speckle contrast with a change in the current temperature of modified collagen tissue is the typical looplike form of the contrast-temperature dependencies associated with irreversible changes in tissue structure and correlated with changes in the tissue diffuse transmittance and the tissue internal stress mentioned by other researchers. 相似文献
8.
The phase composition and structure of Co60Ge40 prepared by mechanical alloying followed by heat treatment are studied by x-ray diffraction, x-ray microanalysis, differential scanning calorimetry, and scanning electron microscopy. The results indicate that milling a 60 : 40 mixture of Co and Ge for 2 h leads to the formation of phase-pure, nanocrystalline -Co5Ge3 (B82 structure). This phase is chemically inhomogeneous and metastable. On heating to 720°C, it transforms into a homogeneous, equilibrium phase of -Co5Ge3. The transformation into the stable phase occurs through a two-phase state, involving the formation of the orthorhombic phase Co2Ge. At t 630°C, Co2Ge dissolves in -Co5Ge3. 相似文献
9.
The composition, structure, and size of a coating formed as a result of the interaction between iron and a sodium tetraborate melt with additions of boron and silicon carbides have been determined using electron-probe X-ray microanalysis, X-ray powder diffraction analysis, and optical microscopy. The main regularities of the diffusion in multiphase systems have been considered. The rate constants of the growth of the phases under investigation and the parameters relating the reaction rate to the diffusion and thermodynamic characteristics of the Fe-B system have been determined. 相似文献
10.
S. I. Sviridov N. G. Tyurnina Z. G. Tyurnina L. N. Kurilenko 《Glass Physics and Chemistry》2018,44(2):85-91
The ion-exchange interaction of the sodium aluminosilicate and sodium galliumsilicate melts with a mixture of molten Li, Na, K, Rb, Cs, and Ba chlorides is studied. It is established that two alkaline silicate melts are characterized by negative deviations from the ideal behavior, and silicate melts containing alkaline and alkaline-earth cations are characterized by noticeable positive deviations from the ideal behavior. 相似文献