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1.
High-performance industrial drives widely employ induction motors with position sensorless vector control (SLVC). The state-of-the-art SLVC is first reviewed in this paper. An improved design procedure for current and flux controllers is proposed for SLVC drives when the inverter delay is significant. The speed controller design in such a drive is highly sensitive to the mechanical parameters of the induction motor. These mechanical parameters change with the load coupled. This paper proposes a method to experimentally determine the moment of inertia and mechanical time constant of the induction motor drive along with the load driven. The proposed method is based on acceleration and deceleration of the motor under constant torque, which is achieved using a sensorless vector-controlled drive itself. Experimental results from a 5-hp induction motor drive are presented. 相似文献
2.
S. M. DESHPANDE S. L MISHRA R. B. GAJANKUSH N. V. THAKUR K. S. KOPPIKER 《Mineral Processing and Extractive Metallurgy Review》2013,34(1):267-273
A rare earth concentrate assaying about 60% Y2O3, is generally obtained directly from Y rich minerals like xenotime or from monazite after preliminary fractionation of rare earths chloride as is practised currently at Indian Rare Earths Ltd.. Alwaye. Using this intermediate concentrate. SX process has been developed in our laboratory to purify Y (>99.9%) in presence of NH4SCN. The process parameters for DEHPA and PC 88A systems have been optimised using a computer program in BASIC. The DEHPA flowsheet has been tested at bench-scale to produce several kilograms of 93% Y2O3. During these trials certain problems were faced due to high acidities. With PC 88A there were no problems and the flowsheet based on the solvent was confirmed at pilot-plant level. The solution containing 93% pure Y2O3, is purified further by another cycle of SX with 50% TBP in kerosene in presence of 1.0 M NH4 SCN. The impurities are extracted leaving >99.9% pure Y2O3 in the aqueous phase. The process parameters optimised for obtaining >90% recovery of Y2O3 are described. 相似文献
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The simultaneous effects of fermentation temperature (20.8–29.2C), total solids (TS) level (13–16% w/v) and total inoculum level (1–4% v/v) on the acidification process in buffalo milk fermented with dahi culture were explored by means of response surface methodology. The changes in lactose content and lactic acid in buffalo milk (14.5% TS) inoculated with 2.5% culture were investigated during fermentation at 27.5C. The utilization of lactose followed first order kinetics during dahi fermentation. The syneresis increased with increase in fermentation temperatures. A firmer gel was achieved with a medium acidification rate in the range of fermentation temperatures from 27C to 29.2C, medium TS of 14.5–15%, and at a total inoculum level of 2.5%. 相似文献
5.
G.V.V. SURYA KIRAN K. HARI KRISHNA Sk. SAMEER M. BHARGAVI B. SANTOSH KUMAR G. MOHANA RAO Y. NAIDUBABU RAVIKUMAR DUMPALA B. RATNA SUNIL 《中国有色金属学会会刊》2017,27(4):804-811
AZ91 Mg alloy was considered and friction stir processing (FSP) was adopted to achieve grain refinement to investigate the effect of grain size and secondary phase on machining characteristics during drilling at various speeds and feeds. Super saturated AZ91 Mg alloy was obtained after FSP and the grain refinement was achieved from (166.5±8.7) µm to (21.7±13.5) µm. Surprisingly, hardness reduced for FSP AZ91 Mg alloy (88.95±6.1) compared with AZ91 alloy (108.2±15.6), which was attributed to the reduced secondary phase. However, the mean cutting force for FSP-treated (FSPed) AZ91 Mg alloy was marginally increased. The edge damage of the drilled holes was lower for FSPed AZ91 Mg alloy compared with unprocessed AZ91 Mg alloy. Hence, it can be understood that the grain refinement may slightly increase the cutting forces during drilling but better edge finishing can be achieved in machining of AZ91 Mg alloy. 相似文献
6.
A. K. SINHA S. P. MATHUR ASHOK K. SINHA Y. N. MISHRA K. K GUPTA 《International Journal of Electronics》2013,100(5):937-944
Based on the solution of the Riccati equation, a hyperbolically tapered microstrip transmission line for matching a complex load to a standard coaxial cable is designed. An iterative procedure is used to yield the phase constant leading to an accurate design. A numerical example is considered. The result shows that a tremendous reduction in the size of matching components can be achieved if hyperbolic instead of uniform transmission lines are used. This is highly advantageous in the miniaturization of solid state circuits. 相似文献
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S. K. MISHRA S. DAS R. P. GOEL P. RAMACHANDRARAO 《Journal of Materials Science Letters》1997,16(12):965-967
Abstracts are not published in this journal
This revised version was published online in November 2006 with corrections to the Cover Date. 相似文献
9.
In this paper, an effective procedure of response surface methodology (RSM) has been utilized for finding the optimal values
of process parameters while induction hardening of AISI 1040 under two different conditions of the material i.e., rolled and
normalized. Various process parameters, such as feed rate (speed at which the induction coil moves, which is measured in mm/sec),
current, dwell time (time after which heat intensity starts to heat work piece in seconds) and gap between the work piece
and induction coil have been explored by experiments. Hardness at two different conditions has been considered as performance
characteristic. The experiment plan was based on rotatable, central composite design (CCD). The experimental results showed
that the proposed mathematical models suggested could describe the performance indicators within the limits of the factors
being investigated. The obtained optimal process parameters have been predicted and verified by confirmation experiments.
Microstructure and SEM (scanning electron microscope) analyses were also done for justification of the work. 相似文献
10.