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排序方式: 共有93条查询结果,搜索用时 15 毫秒
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Tools for dynamic analysis of the general large power system using time-varying phasors 总被引:2,自引:0,他引:2
V. Venkatasubramanian 《International Journal of Electrical Power & Energy Systems》1994,16(6):365-376
This paper extends the applicable range of phasors for transient analysis from the traditional slow quasi-stationary range to accommodate fast speeds up to the carrier frequency. Rigorous phasor calculus is developed for time varying low pass phasor signals whose bandwidths are less than the 60 Hz carrier frequency. Symmetrical components technique for analysing quasi-stationary unbalanced power system transients is extended to cover the low pass time-varying phasors. It is also proved that the time varying phasors can be used for computing the fast electromagnetic transients within the linear RLC lumped parameter representation of the transmission network irrespective of the transient speeds. In linear networks, this time-varying phasor concept unifies two classical approaches: (1) transient analysis using instantaneous currents and voltages, and (2) steady state analysis using traditional phasors, into analysing both behaviours precisely using the time-varying phasors. 相似文献
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N‐Arylsulfonyl Indolines as Retinoic Acid Receptor‐Related Orphan Receptor γ (RORγ) Agonists 下载免费PDF全文
Dr. Christelle Doebelin Rémi Patouret Ruben D. Garcia‐Ordonez Dr. Mi Ra Chang Dr. Venkatasubramanian Dharmarajan Dana S. Kuruvilla Scott J. Novick Li Lin Dr. Michael D. Cameron Dr. Patrick R. Griffin Dr. Theodore M. Kamenecka 《ChemMedChem》2016,11(23):2607-2620
The nuclear retinoic acid receptor‐related orphan receptor γ (RORγ; NR1F3) is a key regulator of inflammatory gene programs involved in T helper 17 (TH17) cell proliferation. As such, synthetic small‐molecule repressors (inverse agonists) targeting RORγ have been extensively studied for their potential as therapeutic agents for various autoimmune diseases. Alternatively, enhancing TH17 cell proliferation through activation (agonism) of RORγ may boost an immune response, thereby offering a potentially new approach in cancer immunotherapy. Herein we describe the development of N‐arylsulfonyl indolines as RORγ agonists. Structure–activity studies reveal a critical linker region in these molecules as the major determinant for agonism. Hydrogen/deuterium exchange coupled to mass spectrometry (HDX‐MS) analysis of RORγ–ligand complexes help rationalize the observed results. 相似文献
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Venkatasubramanian Sivakumar P. D. Gayathri T. Amudha 《The International journal of environmental studies》2013,70(4):536-548
It is desirable to make effective use of solid wastes, as well as waste liquors, of the dye house generated from leather processing. The present study deals with the adsorption of Acid red 26 (Xylidine ponceau) dye using leather fibre waste (buffing dust) as substrate matrix by the means of ultrasound, magnetic stirring and conventional heating. The research examined the effect of various process parameters: ultrasonic power, concentration of dye, temperature and time. The dye uptake data have been fitted with Freundlich and Langmuir isotherms, indicating a useful dye adsorption process. A mechanism for dye adsorption in leather fibres has also been proposed. This study shows that it is possible to remove dyes from dye house effluent streams using leather waste fibres of buffing dust by means of ultrasound. Two different toxic wastes produced by the same industry can be effectively contained. This ‘Intra wastes interaction’ approach could reduce the burden of discarding wastes of other materials in the leather industry. 相似文献
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Mass transfer and biochemical reaction in enzyme membrane reactor systems—I. Single enzyme reactions
W.R. Vieth A.K. Mendiratta A.O. Mogensen R. Saini K. Venkatasubramanian 《Chemical engineering science》1973,28(4):1013-1020
The effective use of an enzyme as a biological catalyst for process scale conversion is greatly enhanced by immobilizing the enzyme within the matrix of a membrane whose walls are permeable to the substrate and product. The enzyme is thus stabilized for reuse, but the apparent activity is reduced compared to that obtained with the free enzyme because of transport resistances in the bulk fluid near the membrane and within the membrane itself. To account for this reduction, solutions to the differential equations describing the mass transport-kinetic models can be obtained for certain important cases. The reaction is considered to be first-order and isothermal, and to occur in one of two modes of operation: fixed-bed or batch (limited volume). Irreversible and reversible reactions and plane sheet and spherical geometries of the membrane are considered. An example of the application of these solutions to actual data obtained with a laboratory scale immobilized enzyme reactor is presented. 相似文献
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In this paper we present and evaluate algorithms to address combined path and server selection (CPSS) problems in highly dynamic multimedia environments. Our goal is to ensure effective utilization of network and server resources while tolerating imprecision in system state information. Components within the framework implement the optimized scheduling policies as well as collect/update the network and server parameters using a directory service. We present and analyze multiple policies to solve the CPSS problem. In addition, we study multiple techniques for updating the directory service with system state information. We further evaluate the performance of the CPSS policies under different update mechanisms and study the implications of the CPSS policies on directory service management. 相似文献
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In this work, we present the optical constants of bismuth telluride (Bi2Te3), and antimony telluride (Sb2Te3) determined using spectroscopic ellipsometry (SE). The spectral range of the optical constants is from 404 nm to 740 nm.
Bi2Te3 and Sb2Te3 films with different thicknesses were grown by metalorganic chemical vapor deposition (MOCVD). Multiple sample analysis (MSA)
technique was employed in order to eliminate the parameter correlation in the SE data analysis caused by the presence of the
overalyer on top of Bi2Te3 and Sb2Te3 films. Optical constants and thicknesses for both Bi2Te3 and Sb2Te3 overlayers were also determined. Independent Bi2Te3 and Sb2Te3 samples were used to check the results obtained. In addition, SE analysis was performed on two Sb2Te3 samples after being etched in diluted NH4OH solution in order to characterize the overlayer and confirm the reliability of the results. 相似文献