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1.
The MnO activities in (MnO-CrO
x
-CaO-SiO2)-containing melts, which were saturated with the (Mn, Cr)3O4 spinel phase, were determined at 1500 °C under an oxygen partial pressure of 10−8.99 atm. This was done by equilibrating the samples with platinum. The activity of MnO in the melt was then calculated from the
activity coefficient of manganese in the resultant Pt-Cr-Mn alloy. Darken’s quadratic formalism for ternary metallic solutions
was used to calculate the activity coefficient of manganese in the Pt-Cr-Mn system, in which platinum was considered to be
the solvent. It was found that an increase in the concentration of MnO in the melt increases both the MnO activity and the
activity coefficient of MnO. For a constant MnO concentration in the (MnO-CrO
x
-CaO-SiO2)-containing melts, the activity of MnO can be increased by increasing the basicity of the melt. In order to obtain high-manganese
recoveries from (MnO-CrO
x
-CaO-SiO2)-containing melts into an alloy phase, basic slags in which the activity coefficient of MnO is high should therefore be used. 相似文献
2.
Dipl.-Ing. Thomas Klein Salar Niknafs Rian Dippenaar Helmut Clemens Svea Mayer 《BHM Berg- und Hüttenm?nnische Monatshefte》2014,159(7):289-290
Solid-state phase transformations and grain growth of an intermetallic γ-TiAl alloy were investigated in-situ using high-temperature laser scanning confocal microscopy (HTLSCM). During isothermal annealing in the single β-phase region, significant grain coarsening was observed. On cooling beneath the β-transus temperature with different rates, a CCT diagram was evaluated for the initiation of β to α phase transformation and changes in the morphology were observed. 相似文献
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Mingdong Li Rian You George W. Mulholland Michael R. Zachariah 《Aerosol science and technology》2014,48(1):22-30
For a nonspherical particle, a standard differential mobility analyzer (DMA) measurement yields a mobility-equivalent spherical diameter, but provides no information about the degree of sphericity. However, given that the electrical mobility for nonspheres is orientation-dependent, and that orientation can be manipulated using electric fields of varying strength, one can, in principle, extract some type of shape information through a systematic measurement of mobility as a function of particle orientation. Here, we describe the development of a pulsed-field differential mobility analyzer (PFDMA) which enables one to change the peak E-field experienced by the particle to induce orientation, while still maintaining the same time-averaged field strength as a standard DMA experiment. The instrument is validated with polystyrene latex (PSL) spheres with accurately known size, and gold rods with dimensions accurately determined by transmission electron microscopy (TEM). We demonstrate how the instrument can be used for particle separation and extraction of shape information. In particular, we show how one can extract both length and diameter information for rod-like particles. This generic approach can be used to obtain dynamic shape factors or other multivariate dimensional information (e.g., length and diameter).
Copyright 2014 American Association for Aerosol Research 相似文献
5.
基于体素S因子计算个体化病例的三维剂量是目前核医学研究的一个重要方向.153Sm是目前骨转移治疗常用的核素之一.本文利用EGS4蒙特卡罗程序包构建了基于体素的三维吸收剂量分布模拟程序,计算了不同情况下153Sm的S因子,探讨了介质成分和物理密度对S因子的影响.结果表明:1)不同物理密度对S因子有明显影响;2)在相同物理密度的情况下,不同介质对S因子的影响相对较小.计算结果为基于体素S因子计算核素治疗的三维剂量提供了参考,明确了在不考虑介质和物理密度差异时S因子的误差. 相似文献
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M. A. Dippenaar M. D. Sole J. L. Van Rooy G. J. du Toit J. L. Reynecke 《Bulletin of Engineering Geology and the Environment》2005,64(4):347-360
Determining the thickness of a LNAPL (light non-aqueous phase liquid) hydrocarbon plume in the fractured rock surrounding
a borehole is a very important aspect in determining the quantity and degree of contamination of the groundwater and soil,
as well as deciding on applicable remediation measures. This review aims to compare some of the field and empirical methods
to eventually propose a method of confirming the plausibility of the determined thickness. General insight is supplied relating
to the occurrence of groundwater in the Earth’s crust, the basic principles of multiphase flow and the properties of the three
fluids of importance, being water, Jet A-1 fuel and air. From the methods applied, the field bail-down method of Hughes et
al. and the mathematical approach according to CONCAWE supplied reasonable results, with the Zillox and Muntzer equation providing
no rational outcome due to changing water levels from regular bailing of the LNAPL. Furthermore, practically none of these
methods have been developed for deep, fractured aquifers. By plotting regular depths to water and fuel on the abscissa axis
with free product thickness on the ordinate, the depth to water and depth to fuel linear plots will intersect where the free
product thickness equals zero. This indicates the static water level (i.e., the ground water level prior to hydrocarbon contamination)
and by subtracting this from the free product depth, a maximum product thickness is obtained.
相似文献
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