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101.
Recursive Bayesian estimation of autoregressive model with uniform noise using approximation by parallelotopes
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Lenka Pavelková Ladislav Jirsa 《International Journal of Adaptive Control and Signal Processing》2017,31(8):1184-1192
This paper proposes a recursive algorithm for the estimation of a stochastic autoregressive model with an external input. The noise of the involved model is described by a uniform distribution. The model parameters are estimated using the Bayesian approach. Without an approximation, the support of the posterior distribution is a complex multidimensional polytope whose number of faces increases with time. We propose an approximation of this polytope in each time step by a parallelotope with a constant number of faces. The behaviour of the proposed algorithm is illustrated by simulations and compared with other methods. 相似文献
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104.
Milan Vlček Ladislav Tichý Jiří Klikorka Ales Tříska 《Journal of Materials Science》1989,24(7):2508-2512
The optical properties of Ge40-x
Sb
x
Se60 glasses have been studied in the infrared spectral region and also in the short wavelength region. The spectral dependence of the absorption coefficient in the region of multiphonon absorption, optical gap and average gap was discussed in relation to the chemical composition. It is supposed that the structure of these glasses is complicated due to structural units containing mainly Ge-Se, Sb-Se and also Ge-Ge, Ge-Sb and Sb-Sb bonds. 相似文献
105.
Ladislav Fikes 《真空研究与实践》1992,4(4):265-268
In this paper it is pointed to existence of analogy between the electrical and vacuum-technical and respective equations, which provides for making simplified and quick calculations in the field of vacuum technology. This analgoy is documented on hand of several examples. 相似文献
106.
Ladislav Dvonek Luka Machov Miloslav orm Zdenk Pelzbauer Jií vantner Vladimír Kubnek 《大分子材料与工程》1990,174(1):25-39
Monofilaments possessing various degrees of birefringence were obtained by changing the drawing rate, the molten polymer temperature, and the molecular weight of polystyrene (PS) and poly(methyl methacrylate) (PMMA). The “brittle-toductile” transition point of optically pure PS was found in the range of birefringences of ?0.6 · 10?3 to ?2.6 · 10?3. Both the height and position of this point are influenced by M?w, molecular weight distribution, and polymer melt temperature. The birefringence of PS is higher by two orders of magnitude than that of PMMA in which this transition point has not been observed. The mechanical and optical properties depend not only on the average amount of orientation characterized by the birefringence but on what portion of the relaxation spectrum of the polymer is preferentially oriented. During the drawing of PS and PMMA monofilaments crazes are formed in the centre of the fibers and do not reach the surface. 相似文献
107.
Ladislav Fukal Miroslav Marek Jan Ká 《Zeitschrift für Lebensmitteluntersuchung und -Forschung A》1983,176(6):430-433
Summary The effect of different chemical modifications of papain on the proteolytic activity and immunoreactivity has been studied. Modification with Dextran T 2000 caused increasing decline in proteolytic activity both with increasing degree of dextran oxidation and amount of bound dextran, whilst the immunoreactivity determined by nephelometry remained unchanged. Modification of papain with glutaraldehyde and formaldehyde causes rapid drops in both activities, even at very low concentrations of agents. Acetylation of papain showed expressive maxima of both proteolytic and immunochemical activities at the same degree of enzyme acetylation. Modification with diazobenzensulphonic acid caused a high increase in immunoreactivity and a small increase in proteolytic activity.
Proteolytische Aktivität und Immunreaktivität von chemisch modifiziertem Papain
Zusammenfassung Es wurde der Einfluß verschiedener chemischer Modifizierung des Papains auf dessen proteolytische Aktivität und Immunreaktivität untersucht. Die Modifikation des Papains mit Dextran T 2000 1äßt die proteolytische Aktivität bei steigender Dextran-oxidation und mit der Menge des gebundenen Dextrans abnehmen, wobei die Immunreaktivität, nephelometrisch bestimmt, unverändert bleibt. Bei der Modifizierung von Papain mit Glutaraldehyd und Formaldehyd werden beide Aktivitäten, auch bei sehr niedrigen Konzentrationen der Reagentien, stark erniedrigt. Das acetylierte Papain zeigt ein scharfes Maximum der proteolytischen und der immunchemischen Aktivität bei demselben Grad der Enzymacetylierung. Die Modifizierung von Papain mit der Diazobenzosulfonsäure verursacht einen hohen Anstieg der Immunreaktivität und einen nur geringen der proteolytischen Aktivität.相似文献
108.
Ewout ter Haar Raymond Wagner Clemens M. C. M. van Woerkens Stephen C. Steel Giorgio Frossati Ladislav Skrbek Mark W. Meisel Valdir Bindilatti Alexandre R. Rodrigues Ramon Valls Martin Nei F. Oliveira Jr. 《Journal of Low Temperature Physics》1995,99(1-2):151-166
A new design for conventional,3He re-circulating, dilution refrigerators has been developed and tested. The units are made out of plastic and can be designed to have very small diameters (<15mm). These characteristics make them ideal to cool samples below 100 mK in high or time-varying magnetic fields. Furthermore, they are inexpensive, reliable and easily constructed. The best refrigerators reach continuous temperatures of around 10 mK at low circulation rates ( 100 mol/s). The cooling power at high temperatures is limited by the speed of the circulation pump and not by the refrigerator itself. The basic design and construction methods are discussed. 相似文献
109.
Cluster analysis is a tool often employed in the micro-array techniques but used less in the real-time PCR. Herein we present core SAS code that instead of the Euclidian distances takes correlation coefficient as a dissimilarity measure. The dissimilarity measure is made robust using a rank-order correlation coefficient rather than a parametric one. There is no need for an overall probability adjustment like in scoring methods based on repeated pair-wise comparisons. The rank-order correlation matrix gives a good base for the clustering procedure of gene expression data obtained by real-time RT-PCR as it disregards the different expression levels. Associated with each cluster is a linear combination of the variables in the cluster, which is the first principal component. Large set of variables can then be replaced by the set of cluster components with little loss of information. In this way, distinct clusters containing unregulated housekeeping genes along with other steadily expressed genes can be disclosed and utilized for standardization purposes. Simulated data in parallel with the data from a biological experiment were taken to validate the SAS macro. For both cases, good intuitive results were obtained. 相似文献
110.
Christian Schüller Ladislav Kavan Daniele Panozzo Olga Sorkine‐Hornung 《Computer Graphics Forum》2013,32(5):125-135
Mappings and deformations are ubiquitous in geometry processing, shape modeling, and animation. Numerous deformation energies have been proposed to tackle problems like mesh parameterization and volumetric deformations. We present an algorithm that modifies any deformation energy to guarantee a locally injective mapping, i.e., without inverted elements. Our formulation can be used to compute continuous planar or volumetric piecewise‐linear maps and it uses a barrier term to prevent inverted elements. Differently from previous methods, we carefully design both the barrier term and the associated numerical techniques to be able to provide immediate feedback to the user, enabling interactive manipulation of inversion‐free mappings. Stress tests show that our method robustly handles extreme deformations where previous techniques converge very slowly or even fail. We demonstrate that enforcing local injectivity increases fidelity of the results in applications such as shape deformation and parameterization. 相似文献