全文获取类型
收费全文 | 267篇 |
免费 | 12篇 |
国内免费 | 4篇 |
专业分类
电工技术 | 2篇 |
综合类 | 1篇 |
化学工业 | 82篇 |
金属工艺 | 4篇 |
机械仪表 | 4篇 |
建筑科学 | 3篇 |
矿业工程 | 3篇 |
能源动力 | 23篇 |
轻工业 | 2篇 |
水利工程 | 2篇 |
石油天然气 | 2篇 |
无线电 | 25篇 |
一般工业技术 | 97篇 |
冶金工业 | 9篇 |
原子能技术 | 1篇 |
自动化技术 | 23篇 |
出版年
2023年 | 3篇 |
2022年 | 24篇 |
2021年 | 18篇 |
2020年 | 10篇 |
2019年 | 7篇 |
2018年 | 7篇 |
2017年 | 4篇 |
2016年 | 13篇 |
2015年 | 4篇 |
2014年 | 20篇 |
2013年 | 31篇 |
2012年 | 18篇 |
2011年 | 19篇 |
2010年 | 12篇 |
2009年 | 15篇 |
2008年 | 21篇 |
2007年 | 16篇 |
2006年 | 8篇 |
2005年 | 9篇 |
2004年 | 6篇 |
2003年 | 3篇 |
2002年 | 5篇 |
2001年 | 3篇 |
2000年 | 2篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1995年 | 1篇 |
1989年 | 1篇 |
1988年 | 1篇 |
排序方式: 共有283条查询结果,搜索用时 15 毫秒
71.
In this paper a new family of sorbents, specifically designed for ethanol sorption, is presented. The composites were synthesized by a dry impregnation of matrices with an aqueous solution of various salts. The ethanol sorption capacity of the composites, under conditions typical for adsorptive air conditioning cycle, has been measured by using an express method based on the Polanyi principle of temperature invariance. Results obtained show that the best novel composites have the ethanol sorption ability which is higher than that of known ethanol sorbents. The composite LiBr(30 wt.%)/SiO2 appears to show the highest sorption capacity and an uptake variation Δw = 0.56 and 0.40 g/g for air conditioning and ice making cycles, respectively. They are much larger than those obtained for conventional adsorbents. The correspondent cooling coefficient of performance (COP) was estimated to be 0.66 and 0.61, which is comparable with the COP of the best water sorbents. 相似文献
72.
Nano-Electronic Realizations of Quantum Bits 总被引:1,自引:0,他引:1
Yuriy Makhlin Gerd Shön Alexander Shnirman 《Journal of Low Temperature Physics》2000,118(5-6):751-763
Quantum computers could perform certain tasks which noclassical computer can perform in acceptable times. Josephsonjunction circuits can serve as building blocks of quantumcomputers. We discuss and compare two designs, which employcharge or magnetic flux degrees of freedom to process quantuminformation. In both cases, elementary single-qubit and two-qubit logic gates can be performed by voltage or flux pulses.The coherence time is long enough to allow a series of suchoperations. We also discuss the read-out, i.e. a quantummeasurement process. In the charge case it is accomplished bycoupling a single-electron transistor to the qubit. 相似文献
73.
Zhiming M Wang Yanze Z Xie Vasyl P Kunets Vitaliy G Dorogan Yuriy I Mazur Gregory J Salamo 《Nanoscale research letters》2010,5(8):1320-1323
Multilayers of InGaAs nanostructures are grown on GaAs(210) by molecular beam epitaxy. With reducing the thickness of GaAs
interlayer spacer, a transition from InGaAs quantum dashes to arrow-like nanostructures is observed by atomic force microscopy.
Photoluminescence measurements reveal all the samples of different spacers with good optical properties. By adjusting the
InGaAs coverage, both one-dimensional and two-dimensional lateral ordering of InGaAs/GaAs(210) nanostructures are achieved. 相似文献
74.
Larisa G. Gordeeva Alexandra D. Grekova Tamara A. Krieger Yuriy I. Aristov 《Microporous and mesoporous materials》2009,126(3):262-267
This paper presents experimental data on synthesis and the phase composition of novel composites “(LiCl + LiBr) confined to the silica gel pores” as well as their sorption equilibrium with water and methanol vapour. Phase transformation of the composites during methanol sorption was characterized in situ by an X-ray diffraction analysis. The isobars of sorption on the composites were measured in the temperature range T = 303–383 K at the methanol and water pressure P = 107 and 13 mbar, respectively, using a thermo-gravimetric technique. It was shown that the formation of solid solutions of LiCl and LiBr took place in limited ranges of LiBr (CBr = 0–11 mol.%) and LiCl (CCl = 0–36 mol.%) content. These solutions absorbed water (methanol) at temperature that was intermediate between the individual solvation temperatures for confined LiCl and LiBr. In the composites with LiCl/LiBr molar ratio between the ranges of solubility a mixture of two solid solutions was formed. Each solution absorbed water (methanol) independently at a certain temperature. The use of the binary LiCl–LiBr system confined to the silica pores can be an effective tool for designing innovative materials with predetermined sorption properties. 相似文献
75.
In this paper, we find the optimal horizons and sampling intervals, both in the sense of the minimum mean square error (MSE), for a one-parameter family of the discrete-time unbiased finite impulse response (FIR) filters. On a horizon of Nl points in the nearest past, the FIR and the model k-state are represented with the l-degree and m-degree polynomials, respectively. The noise-free state space model is observed in the presence of zero-mean noise of an arbitrary distribution and covariance. The approach is based on the following. The FIR filter produces an unbiased estimate if lm. In order to reduce the noise, Nl needs to be increased. The model fits the increased horizon with a higher degree polynomial, m>l. Minimization of the mean square error for m>l gives the optimal horizon and sampling interval. Justification is provided for the global positioning system (GPS)-based measurements of the first state of a local crystal clock provided in the presence of uniformly distributed sawtooth noise induced by the GPS timing receiver. 相似文献
76.
Formalized study of self-assembly has led to the definition of the tile assembly model, Previously I presented ways to compute arithmetic functions, such as addition and multiplication, in the tile assembly model: a highly distributed parallel model of computation that may be implemented using molecules or a large computer network such as the Internet. Here, I present tile assembly model systems that factor numbers nondeterministically using Θ(1) distinct components. The computation takes advantage of nondeterminism, but theoretically, each of the nondeterministic paths is executed in parallel, yielding the solution in time linear in the size of the input, with high probability. I describe mechanisms for finding the successful solutions among the many parallel executions and explore bounds on the probability of such a nondeterministic system succeeding and prove that the probability can be made arbitrarily close to 1. 相似文献
77.
Evolutionary Testing of Hydraulic Simulator Functionality 总被引:1,自引:1,他引:0
Nikolai B. Gorev Inna F. Kodzhespirova Yuriy Kovalenko Rogelio Álvarez Eugenio Prokhorov Alfredo Ramos 《Water Resources Management》2011,25(8):1935-1947
A method for automatic functional testing of hydraulic simulators is proposed. The method is based on using genetic algorithms
to search for network parameter values at which the simulator under test computes solutions that do not satisfy the governing
network equations. The search is made by maximizing the residual of the governing equations. The application of the method
to the latest version of the EPANET hydraulic simulator demonstrates its efficiency in detecting incorrect results. The results
of quantitative assessment of the functional adequacy of the EPANET solver by random testing are presented. The paper provides
examples of hydraulic networks and of parameter value combinations for which incorrect results occur. An example of the use
of automatic functional testing together with automatic convergence testing in a comprehensive study of the flow control valve
model of the EPANET solver is given. 相似文献
78.
Yuriy S. Shmaliy Oscar Ibarra-Manzano Luis Arceo-Miquel Jorge Munoz-Diaz 《Measurement》2008,41(5):538-550
A thinning algorithm is proposed for real-time unbiased finite impulse response (FIR) estimation of the local clock time interval error (TIE) model (time error, fractional frequency offset, linear frequency drift rate, etc.) employing GPS-based sawtooth measurements. We show that the approach allows obtaining practically optimal estimates of the clock states, by large horizons (number of the points in the average). The algorithm is applied to the TIE measurements allowing for different time steps and averaging horizons for each of the clock states and compared to the three state Kalman filter. It is demonstrated that, in the presence of the sawtooth noise induced by the GPS receiver, the unbiased FIR estimates with thinning out fit the clock states better than the Kalman filter, in terms of the Allan deviation and precision time protocol deviation. 相似文献
79.
Optically transparent ZnO-based n-i-p ultraviolet photodetectors 总被引:1,自引:0,他引:1
An optically transparent tin-doped indium oxide/ZnO/NiO n-i-p heterostructure photodiode was fabricated by ion beam assisted e-beam evaporation. The diode clearly demonstrates rectifying current-voltage (J-V) characteristics with a current rectification ratio up to 104 at bias ± 2 V and a low reverse current of ∼ 100 nA/cm2 at − 5 V. Analysis of J-V characteristics including time dependence of the dark current shows that the leakage current at low biases is attributed to thermal generation via defect states, and at high biases, field-enhanced carrier generation from the ZnO layer dominates. Spectral response and linearity measurements indicate that such a diode is particularly suitable for low level of ultraviolet detection. 相似文献
80.
Yuriy?SidorEmail author Mykola?Dzubinsky Frantisek?Kovac 《Journal of Materials Science》2005,40(23):6257-6262
In highly inhomogeneous microstructures with a wide range of grain sizes, the problem arises of defining an effective average
grain size. An original method for the estimation of effective average grain size and a parameter describing the homogeneity
of microstructure are presented. The coefficients of homogeneity for equiaxed and columnar microstructures are calculated.
The effective average grain size is calculated as a weighted sum of the average grain sizes of homogeneous grain groups. 相似文献