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51.
《Inorganic chemistry communications》2007,10(5):575-579
Two Cu(II)–fluconazole supramolecular isomers 1 and 2 formulated as (flu)2Cu(SCN)2 (flu = fluconazole) have been synthesized and structurally characterized by single crystal X-ray diffraction. Different solvent media lead to the different binding modes of anion SCN− and the flexible C–C chain of fluconazole has been rotated in the two isomers. Complex 1 exhibits a two dimensional square grid-like layer and complex 2 exhibits a two dimensional framework with a parquet motif. Different H-bonds and stacking modes are observed in the two isomers. Complex 1 is nonemissive, whereas complex 2 exhibits photoluminescence property. 相似文献
53.
《The Electricity Journal》2001,14(5):33-38
In a deregulated setting, an approach dubbed the “get-out-of-jail card” offers customers the chance to engage in more selective and less expensive hedging activities than offered by conventional hedges. 相似文献
54.
55.
《Journal of Microcomputer Applications》1991,14(4):327-341
An inexpensive electronic interface for the acquisition of asynchronous flow cytometry data using a commercially available microcomputer and A/D converter is described. In the design of this interface, the major objectives were to minimize the amount of custom hardware necessary between the computer and flow cytometer and to maximize usable sensitivity and resolution by implementing a gated integrator and trigger hold-off approach to acquire the asynchronous data pulses from the cytometer. The major error sources which can occur during data acquisition are identified and their effects on system performance are shown. A simple protocol is described to minimize the effects of these errors on the acquired data. The influence of computer-processor clock speed on data acquisition rates is also documented. 相似文献
56.
《Pattern recognition letters》1987,6(1):15-19
Many methods of classifying satellite imagery have been suggested. Most of the accepted methods, either supervised or unsupervised, are founded on the assumption that the radiance values of a particular ground cover type can be characterized by some probability distribution having a central value(s) and a range parameter(s). This assumption is rarely, if ever, tenable and hence the methods must produce unnecessarily high rates of misclassification. Thus there is a need for an approach which avoids this type of assumption. Pattern recognition techniques, e.g. the ‘watershed’ algorithm, can be used to divide up the radiance-frequency domain, provided the radiance values can be reduced to 2 dimensions. These methods do not presuppose any ‘shape’ for the radiance-frequency distributions and therefore provide an unbiased aid to the interpretation of satellite imagery. 相似文献
57.
《Simulation Practice and Theory》2002,9(3-5):143-166
We describe a HLA-based Stochastic Petri Nets (SPN) Simulation Engine that has been developed in order to study distributed behaviour of SPN. We simulate a Federation constituted from SPN (sub) models. Two approaches are considered: (1) a single Petri Nets (PN) is decomposed into subnets which are executed on different heterogeneously connected computers (2) different PN which model different processes are combined into a single distributed simulation. We use a sender/receiver SPN-model to illustrate these approaches and to explore the impact of time management services applied in the implementation of the SPN distributed simulation engine. 相似文献
58.
《Journal of Great Lakes research》1999,25(1):26-35
The accidental introduction of round gobies (Neogobius melanostomus) into the North American Great Lakes has raised concerns about their potential impacts on local fauna. Gobies have similar habitat and spawning requirements to mottled sculpins (Cottus bairdi) and slimy sculpins (C. cognatus), and may already be displacing sculpins where the ranges of the species overlap. Like sculpins, gobies are capable of penetrating interstitial spaces to acquire food, and therefore may become predators of interstitially incubating lake trout eggs. Laboratory experiments were conducted to compare egg consumption rates and critical size (the minimum size at which a fish was capable of ingesting an egg) between round gobies and mottled sculpins. Predation by both species on lake trout eggs and fry was also examined in two grades of substrate (cobble and gravel). Mottled sculpins consumed larger numbers of eggs than round gobies of similar size, and were capable of ingesting eggs at smaller sizes than gobies. Both gobies and sculpins had lower foraging success on smaller substrates (gravel) than on cobble. Gobies are currently present at higher densities than sculpins in areas where they are established in the Great Lakes. The similar predation of lake trout eggs by round gobies and mottled sculpin and high densities the goby has achieved at some Great Lakes sites leads to the prediction that the round goby may negatively affect lake trout reproduction and therefore rehabilitation. 相似文献
59.
《Water science and technology》1998,37(3):51-58
The vertical distribution of various phosphorus (P)-binding forms, associated potential P-binding partners and the composition of dry material were investigated in the bottom sediments of the dimictic oligotrophic Lake Stechlin and the dimictic eutrophic Lake Feldberger Haussee. Reductant soluble P (Fe- and Mn-bound) at the sediment surface (0-1 cm) was considerably higher to the oligotrophtc Lake Stechlin (1.29 g kgt-1) than in the eutrophic Lake Haussee (0.32 g kgt-1). The amounts of dissolved, loosely adsorbed, metal oxide- and calcium carbonate bound P were higher in the eutrophic lake. The depth profiles of the investigated P species indicated that the mobilization of Fe- and Mn-bound P is the most important mechanism of P-release in oligotrophic lakes, whereas the mobilization of recently sedimented labile organic bound P seems to be the driving force of P-release in eutrophic lakes. In both lakes autochthonous calcite precipitations occurs during the summer months. The coprecipitation of P with calcite is an important self-cleaning mechanism in eutrophic hardwater lakes and contributes to the permanent burial of P in the sediments. Although, the precipitation of calcite is inhibited by the presence of high concentrations of soluble reactive P, the coprecipitation of P with calcite seems to be enhanced. 相似文献
60.
We present a continuous variable Bayesian networks modeling framework that integrates the graphical representation of a Bayesian networks model with empirical model-developing approach. Our model retains the Bayesian networks model's graphical representation of hypothesized causal connections among important variables and employs conventional statistical modeling approaches for establishing functional relationships among these variables. The modeling framework avoids discretizing continuous variables and the resulting models can be updated over time when new data are available or updated using local data to develop a site-specific model. We illustrate the modeling approach using a data for establishing nutrient criteria in streams and rivers in Ohio, U.S.A. 相似文献