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91.
A graphical method is proposed for analysing PFM‐continuous-time hybrid systems. The method is an improved version of the authors' earlier method, which was practical, but had two shortcomings that remained to be addressed. One is that the influence of the included parameter upon stability estimation is not clear, the other being that extension to the network case is not straightforward. The present paper proposes a modified Nyquist analysis method that can overcome the above two problems with little effect on sharpness in the estimation of stability. 相似文献
92.
An energy storage system that stores energy in the form of liquid air was studied. In this system, the cool storage unit was the most important unit. From the viewpoint of safety and economy, it was most promising to store the cold energy as the sensitive heat of a solid such as pebbles or concrete. A simulator was developed to predict temperature variations of the solid cool storage unit. The simulator calculated unsteady heat transfer between a supercritical gas flow and the solid material. Comparison of calculated and experimental results showed that the temperature variation of the metal cool storage medium was accurate within 11%. The calculated results showed for the concrete cool storage unit that a smaller quantity of medium was required with a smaller pitch of the tube. The minimum quantity of concrete calculated at the smallest pitch was three times that of concrete, which was simply estimated from the heat capacity of concrete and air. The volume required for concrete cool storage was less than 1/100 that of reservoirs for a pumped‐hydro power station having a vertical drop of 500 m. © 2002 Wiley Periodicals, Inc. Heat Trans Asian Res, 31(4): 284–296, 2002; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/htj.10035 相似文献
93.
Yosuke Todo 《Journal of Cryptology》2017,30(3):920-959
MISTY1 is a block cipher designed by Matsui in 1997. It was well evaluated and standardized by projects, such as CRYPTREC, ISO/IEC, and NESSIE. In this paper, we propose a key recovery attack on the full MISTY1, i.e., we show that 8-round MISTY1 with 5 FL layers does not have 128-bit security. Many attacks against MISTY1 have been proposed, but there is no attack against the full MISTY1. Therefore, our attack is the first cryptanalysis against the full MISTY1. We construct a new integral characteristic by using the propagation characteristic of the division property, which was proposed in EUROCRYPT 2015. We first improve the division property by optimizing the division property for a public S-box and then construct a 6-round integral characteristic on MISTY1. Finally, we recover the secret key of the full MISTY1 with \(2^{63.58}\) chosen plaintexts and \(2^{121}\) time complexity. Moreover, if we use \(2^{63.994}\) chosen plaintexts, the time complexity for our attack is reduced to \(2^{108.3}\). Note that our cryptanalysis is a theoretical attack. Therefore, the practical use of MISTY1 will not be affected by our attack. 相似文献
94.
95.
Tool life prediction for cup shaped cold forgings with fuzzy language risk analysis and fuzzy inference 总被引:3,自引:0,他引:3
A method of Die-life prediction is suggested for cup shaped forgings.Authors theorize that forge specialists can make die-life prediction by comparing a “target” forging process” with other standard processor whose actual life are known. The authors make comparison by calculation of risk (that which shortens die-life span). Risk is estimated by using a risk tree network, based on information compiled from a survey of forge experts. The risk rate of an “end node” is estimated by a computer-aided forging process planning system. Comparing dimensions of the target and standard forging processes has effect on the risk rate. Once risk is determined, it is used to predict dielife span using Fuzzy inference. The Fuzzy inference rule is estimated based on data received from the interview of experts. 相似文献
96.
An analytical model is developed to correlate the mode I fracture energy of toughened epoxy adhesive joints with microdamage
mechanisms generated around a crack tip. The analytical expression for the mode I fracture energy is derived on the basis
of total energy dissipation during crack extension. Three dominant damage modes, plastic shear band formation, plastic void
growth, and plastic deformation of the entire matrix resin in a crack-tip region, are identified in the proposed model as
the primary energy dissipation mechanisms. Numerical results show that the models can predict the effects of adhesive thickness
on the mode I fracture energy of toughened adhesive joints. The analytical model involving material constants and microstructural
variables should provide some guidelines toward achieving optimum fracture toughness for these types of adhesive joints.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
97.
98.
Zhe Xu Yirui Wang Sheng Li Yanting Liu Yuki Todo Shangce Gao 《IEEJ Transactions on Electrical and Electronic Engineering》2016,11(Z1):S142-S154
This paper describes an artificial immune algorithm (IA) combined with estimation of distribution algorithm (EDA), named IA‐EDA, for the traveling salesman problem (TSP). Two components are incorporated in IA‐EDA to further improve the performance of the conventional IA. First, aiming to strengthen the information exchange during different solutions, two kinds of EDAs involving univariate marginal distribution algorithm and population‐based incremental learning are altered based on the permutation representation of TSP. It is expected that new promising candidate solutions can be sampled from the constructed probabilistic model of EDA. Second, a heuristic refinement local search operator is proposed to repair the infeasible solutions sampled by EDA. Therefore, IA‐EDA can alleviate the deficiencies of the conventional IA and can find better solutions for TSP by well balancing the exploitation and exploration of the search. Experiments are conducted based on a number of benchmark instances with size up to 100 000 cities. Simulation results show that IA‐EDA is effective for improving the performance of the conventional IA and can produce better or competitive solutions than other hybrid algorithms. © 2016 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
99.
100.