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排序方式: 共有526条查询结果,搜索用时 15 毫秒
51.
52.
Marcin Słoma Małgorzata Jakubowska Andrzej Kolek Krzysztof Mleczko Piotr Ptak Adam Witold Stadler Zbigniew Zawiślak Anna Młożniak 《Journal of Materials Science: Materials in Electronics》2011,22(9):1321-1329
This paper presents the results of authors investigations on elaboration of a new thick film composition filled with carbon
nanotubes (CNTs). The polymer composition consists of polymer vehicle, which is the solution of organic resin in certain combination
of solvents, and functional phase—carbon nanotubes well dispersed in the vehicle. The pastes were applied with screen-printing
on several substrates and temperature cured. The properties of obtained layers were characterized. Series of samples were
prepared with different amount of CNTs to evaluate electrical properties. Changes in resistance were investigated during periodic
mechanical and temperature stresses, realized through cyclical bending and rapid temperature change. Tensometric effect was
also investigated. Investigations have proved that polymer composites based on carbon nanotubes exhibit high resilience to
stress factors. Resistance change in function of temperature was also investigated to evaluate temperature coefficient of
resistance (TCR). All this aspects are important for elastic resistors fabrication in printed electronics microcircuits. Resistance
and noise measurements in cryostats have also been involved. 1/f type noise has been observed. Noise intensity, calculated
in decade frequency bands, rises significantly with increasing temperature. Activation energies of thermally activated noise
sources (TANS) have been revealed using low-frequency noise spectroscopy. Relatively large value of negative TCR has been
obtained from resistance versus temperature curve. Calculated dimensionless sensitivity is similar to that observed in cryogenic
temperature sensors. However, bulk noise intensity of resistive layer is larger than obtained for lead containing RuO2 based resistive layers. 相似文献
53.
Witold Kakol 《Thin》1990,10(4):277-297
The stability analysis of stiffened plates by means of the finite strip method is presented. The studies are based on the thin shallow theory, giving nonlinear strain displacement relations, but linear curvature displacement relations. The nonlinear equilibrium equations are obtained by the principle of incremental virtual work, using finite strip discretization. The higher order strip with one internal nodal line is applied. It is shown that considerable improvements can be obtained using this kind of strip. It is especially true for the postbuckling analysis. Numerical examples of the strength of stiffened plates in compression are carried out, covering a range of plate and stiffener slenderness. 相似文献
54.
In this study, we introduce and investigate a class of neural
architectures of self-organizing neural networks (SONNs) that is
based on a genetically optimized multilayer perceptron with
polynomial neurons (PNs) or fuzzy polynomial neurons (FPNs),
develop a comprehensive design methodology involving mechanisms
of genetic optimization, and carry out a series of numeric
experiments. We distinguish between two kinds of SONN
architectures: (a) PN-based and (b) FPN-based SONNs. The
augmented genetically optimized SONN (gSONN) results in a
structurally optimized structure and comes with a higher level
of flexibility in comparison to the one encountered in the
conventional SONN. The genetic algorithm (GA)-based design
procedure being applied at each layer of SONN leads to the
selection of preferred nodes (PNs or FPNs) with specific local
characteristics (such as the number of input variables, the
order of the polynomial, and a collection of the specific subset
of input variables) available within the network. 相似文献
55.
Jacek Jasielski Stanisław Kuta Witold Machowski Wojciech Kołodziejski 《Microelectronics Journal》2014
In the paper we propose a novel architecture and implementation of 11-bit Digital Pulse Width Modulator (DPWM) circuit based on previously known building blocks. Linearized Class-AD Double-sided (LADD) algorithm has been used to calculate the DPWM signals of the 11-bit resolution hybrid DPWM for a Class-AD digital audio amplifier. Noise-shaping process is used to support high fidelity with practical values of time resolution. The proposed DPWM circuit is composed of 8-bit counter and Analog Delay Locked Loop (ADLL) using 4-bit tapped delay line. A dual ADLL employing coarse and fine programmable delay element is used to adjust the delay time of delay line and lock it to required time. The coarse- as well as fine-delay lines are implemented as a cascade of variable-delay elements based on shunt capacitor delay element or single-ended Schmitt trigger. The proposed 11-bit DPWM circuit, at a switching frequency of 352.8 kHz and clock generator frequency of 90.3 MHz allows us to attain SNR of 120 dB and THD of the output signal less than 0.1% within the audio baseband and modulation index M=0.95. Basic verification of circuit manufacturability and simulation results (Monte Carlo analysis) for real CMOS process are presented. 相似文献
56.
Witold ?ukowski 《Combustion and Flame》2003,134(4):399-409
The combustion of premixed natural gas and air has been studied in a bubbling fluidized bed of inert particles. The temperature of the solids was carefully monitored, using 8 thermocouples, immersed in the bed at different heights. The observed temperature profiles were used to find the height above the distributor at which most of the combustion occurred and on this basis a clear distinction could be made between combustion above the bed and inside the bed. The region where most of the heat of combustion is evolved depends on the average bed temperature. If this temperature is low, the gases burn above the bed or just under its upper surface, but at higher temperatures the process is located close to the distributor. Rapid fluctuations in the measured temperature and pressure indicate that the process inside the bed is not a steady one. The model developed here assumes that combustion takes place inside bubbles of premixed gases, as they move through the bed. A detailed chemical kinetic model was used to calculate the induction period for ignition. The model can predict the height above the distributor at which bubbles should ignite and explode. Comparison of the experimental results with the modeling calculations indicates that the course taken by the process depends on temperature. At the lowest temperatures, the gases burn above the bed. In the high temperature range, where the bubbles ignite is determined by the induction period. At intermediate temperatures the location of the reaction is determined by the depth of the bed and bubble size, with ignition spreading from above the bed to bubbles, which are about to leave, but are still in the bed. That bubbles explode at different heights up the bed is reflected in the acoustic signals registered above and below the bed. The associated changes in the composition of the flue gases are also very characteristic. 相似文献
57.
Witold Pedrycz 《IEEE/CAA Journal of Automatica Sinica》2018,5(6):1025-1034
In the plethora of conceptual and algorithmic developments supporting data analytics and system modeling, humancentric pursuits assume a particular position owing to ways they emphasize and realize interaction between users and the data. We advocate that the level of abstraction, which can be flexibly adjusted, is conveniently realized through Granular Computing. Granular Computing is concerned with the development and processing information granules-formal entities which facilitate a way of organizing knowledge about the available data and relationships existing there. This study identifies the principles of Granular Computing, shows how information granules are constructed and subsequently used in describing relationships present among the data. 相似文献
58.
Milo Hricovíni Raymond J. Owens Andrzej Bak Violetta Kozik Witold Musia Roberta Pierattelli Magdalna Mjekov Yoel Rodríguez Robert Musio Aneta Slodek Pavel tarha Karina Pitak Dagmara Sota Wioletta Florkiewicz Agnieszka Sobczak-Kupiec Josef Jampílek 《International journal of molecular sciences》2022,23(23)
The knowledge of interactions between different molecules is undoubtedly the driving force of all contemporary biomedical and biological sciences. Chemical biology/biological chemistry has become an important multidisciplinary bridge connecting the perspectives of chemistry and biology to the study of small molecules/peptidomimetics and their interactions in biological systems. Advances in structural biology research, in particular linking atomic structure to molecular properties and cellular context, are essential for the sophisticated design of new medicines that exhibit a high degree of druggability and very importantly, druglikeness. The authors of this contribution are outstanding scientists in the field who provided a brief overview of their work, which is arranged from in silico investigation through the characterization of interactions of compounds with biomolecules to bioactive materials. 相似文献
59.
Integrating Variable Reduction Strategy With Evolutionary Algorithms for Solving Nonlinear Equations Systems 下载免费PDF全文
Aijuan Song Guohua Wu Witold Pedrycz Ling Wang 《IEEE/CAA Journal of Automatica Sinica》2022,9(1):75-89
Nonlinear equations systems(NESs)are widely used in real-world problems and they are difficult to solve due to their nonlinearity and multiple roots.Evolutionary algorithms(EAs)are one of the methods for solving NESs,given their global search capabilities and ability to locate multiple roots of a NES simultaneously within one run.Currently,the majority of research on using EAs to solve NESs focuses on transformation techniques and improving the performance of the used EAs.By contrast,problem domain knowledge of NESs is investigated in this study,where we propose the incorporation of a variable reduction strategy(VRS)into EAs to solve NESs.The VRS makes full use of the systems of expressing a NES and uses some variables(i.e.,core variable)to represent other variables(i.e.,reduced variables)through variable relationships that exist in the equation systems.It enables the reduction of partial variables and equations and shrinks the decision space,thereby reducing the complexity of the problem and improving the search efficiency of the EAs.To test the effectiveness of VRS in dealing with NESs,this paper mainly integrates the VRS into two existing state-of-the-art EA methods(i.e.,MONES and DR-JADE)according to the integration framework of the VRS and EA,respectively.Experimental results show that,with the assistance of the VRS,the EA methods can produce better results than the original methods and other compared methods.Furthermore,extensive experiments regarding the influence of different reduction schemes and EAs substantiate that a better EA for solving a NES with more reduced variables tends to provide better performance. 相似文献
60.
Witold Brostow Bernard Bujard Patrick E. Cassidy Haley E. Hagg Pablo E. Montemartini 《Materials Research Innovations》2002,6(1):7-12
Samples were prepared by addition of a fluorinated poly(aryl ether ketone) (12F-PEK) to a commercial epoxy resin and curing
at either 24 °C or 70 °C. The concentrations of fluoropolymer in the samples were 0, 5, 10, 20, 30, 40, and 50%. Phase inversion
facilitates the formation of more and more smooth surfaces for scratch testing with increasing fluoropolymer concentration.
A progressively increasing load from 0.03 N to 12 N was administered with a diamond tip to the surfaces of the samples; depths
were determined within ±7.5 nm. The original scratch depth is a function of the fluoropolymer concentration. Scratch recovery
(healing) reaches values up to 95%. Plots of the residual depth versus concentration of the fluoropolymer at 4, 6, 8, and
10 N reveal minima for all forces and both temperatures. Addition of only 5% or 10% 12F-PEK improves the scratch recovery
significantly. The results are explained by changes of material morphology with the fluoropolymer concentration.
Electronic Publication 相似文献