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21.
Fast and intuitive generation of geometric shape transitions 总被引:4,自引:0,他引:4
We describe a novel method for continuously transforming two triangulated models of arbitrary topology into each other. Equal
global topology for both objects is assumed. However, extensions for genus changes during metamorphosis are provided. The
proposed method addresses the major challenge in 3D metamorphosis, namely, specifying the morphing process intuitively with
minimal user interaction and sufficient detail. Corresponding regions and point features are interactively identified. These
regions are parametrized automatically and consistently, providing a basis for smooth interpolation. Suitable 3D interaction
techniques offer a simple and intuitive control over the whole morphing process. 相似文献
22.
It was of interest to investigate the influence of both high doses of eicosapentaenoic acid (EPA) and low doses of 2-or 3-methylated
EPA on the antioxidant status, as they all cause hypolipidemia, but the dose required is quite different. We fed low doses
(250 mg/d/kg body wt) of different EPA derivatives or high doses (1500 mg/d/kg body wt) of EPA and DHA to rats for 5 and 7
d, respectively. The most potent hypolipidemic EPA derivative, 2,2-dimethyl-EPA, did not change the malondialdehyde content
in liver or plasma. Plasma vitamin E decreased only after supplementation of those EPA derivatives that caused the greatest
increase in the fatty acyl-CoA oxidase activity. Fatty acyl-CoA oxidase activity increased after administration of both EPA
and DHA at high doses. High doses of EPA and DHA decreased plasma vitamin E content, whereas only DHA elevated lipid peroxidation.
In liver, however, both EPA and DHA increased lipid peroxidation, but the hepatic level of vitamin E was unchanged. The glutathione-requiring
enzymes and the glutathione level were unaffected, and no significant changes in the activities of xanthine oxidase and superoxide
dismutase were observed in either low-or high-dose experiments. In conclusion, increased peroxisomal β-oxidation in combination
with high amounts of polyunsaturated fatty acids caused elevated lipid peroxidation. At low doses of polyunsaturated fatty
acids, lipid peroxidation was unchanged, in spite of increased peroxisomal β-oxidation, indicating that polyunsaturation is
the most important factor for lipid peroxidation. 相似文献
23.
PURPOSE: To evaluate rod and cone function in individuals with the Laurence-Moon-Bardet-Biedl syndrome. METHODS: We obtained a full-field electroretinograms in 36 patients. If responses less than 10 microV were recorded with single white flashes a special techniques with narrow band filter and computer averaging was used. RESULTS: No rod responses to dim blue light could be obtained in any of the patients. Residual cone flicker responses were measurable in 28 of the individuals. Those with amplitudes < 0.05 microV were significantly older than those with amplitudes > 1.00 microV. The ERG pattern was consistent within affected pairs of siblings in 8 families. CONCLUSION: The retinal dystrophy in Laurence-Moon-Bardet-Biedl syndrome is primarily a rod-cone dystrophy, but even cone flicker amplitudes are severely reduced with further progression with age. There is no intrafamilial variability of the electroretinograms in affected siblings. 相似文献
24.
Frederik Hammes Arsne Seka Kris Van Hege Tom Van de Wiele Jan Vanderdeelen Steven D Siciliano Willy Verstraete 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2003,78(6):670-677
High concentrations of soluble calcium in industrial wastewater present problems due to the calcification of downstream processing. The current trend towards circuit closure and increased water re‐use will escalate this problem. We investigated ureolytic microbial carbonate precipitation as a novel process for removing excess calcium from industrial effluents. Two laboratory‐scale reactors, both with a hydraulic retention time of 8 h, were fed with 1.8 dm3 of anaerobic effluent (about 11 mM Ca2+) from a paper recycling plant. Both reactors were inoculated with pre‐cultivated calcareous sludge and the treatment reactor was additionally dosed with urea to a final concentration of 8.3 mM . Even though the anaerobic wastewater was saturated as such with respect to CaCO3, urea addition and hydrolysis was shown to be a pre‐requisite for precipitation. Almost all (85–90% w/v) of the soluble calcium was precipitated as CaCO3 and removed through sedimentation in the treatment reactor. This bio‐catalytic process presents an uncomplicated and efficient method for the removal of calcium from industrial wastewater. Copyright © 2003 Society of Chemical Industry 相似文献
25.
William Kyamuhangire Hilde Myhre Hege T Srensen Robert Pehrson 《Journal of the science of food and agriculture》2002,82(4):478-482
A comparative study of the enzymatic and mechanical banana juice extraction methods and the respective juices produced was carried out using Kayinja bananas (ABB genotype) imported from Uganda. In the enzymatic extraction process, macerated ripe banana pulp was incubated with a commercial enzyme preparation (Pectinex Ultra SP‐L) at 50 °C for 2 h. In the mechanical extraction process the ripe banana pulp was mixed with stretched strips of polythene and worked with a dough mixer at room temperature for 20 min (on average) until the juice appeared. Significantly (p < 0.05) higher ‘pure’ juice yield (604 g kg?1 pulp) was obtained with the enzymatic method than with the mechanical method (541 g kg?1 pulp). However, adding water to the spent pulp from the mechanical process and extracting dilute juice improved the juice yield to 757 g kg?1 pulp. The enzyme‐extracted juice had significantly (p < 0.05) higher soluble solids, titratable acidity, fructose, glucose, total nitrogen, density and mineral potassium. However, the mechanically extracted juice had significantly higher sucrose, pH and viscosity. Although the mechanical extraction process suffers from occasional juice extraction failures, it offers an opportunity to extract banana juice without excessive energy expenditure, and the juice produced is wholesome with a superior flavour to that produced by the enzymatic method. © 2002 Society of Chemical Industry 相似文献
26.
This technical note describes a novel method for forming external threads in Superinvar. Superinvar [Interferometric measurement of the dimensional stability of Superinvar, UCRL-53787, 1988] is a nickel–cobalt steel (64% Fe, 31% Ni, and 5% Co) with a low coefficient of expansion (0.5 ppm K−1). This alloy finds application in precision assemblies where thermally induced dimensional changes are of concern. This technical note describes a novel process for the manufacture of high-quality adjustment screws (1/4 in. diameter, 2 in. long, 80 threads per inch—TPI) in Superinvar for use in precision adjustment mechanisms. The quality of the threads produced by this technique is superior to that of threads produced by single-point cutting and compares favorably with commercially produced rolled threads. This technique is best suited to economical production of small quantities. 相似文献
27.
Mårten Hetta Hege Nordheim Anne‐Maj Gustavsson Kjell Martinsson 《Journal of the science of food and agriculture》2008,88(2):199-206
BACKGROUND: Two of the most promising in vitro techniques for dynamic forage evaluation are the gas production (GP) and filter bag (FB) techniques. To improve our understanding of how these techniques describe the dynamic degradation of forages, 20 temperate forage samples were analysed by each method at different time points during a 96 h incubation period. The results of the recordings were fitted to a biphasic Michaelis–Menten model describing the degradation of rapidly and slowly degrading forage fractions. RESULTS: GP and disappearance from the FB measurements were correlated at all time points from 6 to 96 h (R2 = 0.27–0.74), except at the 24 h incubation point. When GP was transformed into organic matter degradation (OMD), there was an even stronger correlation (R2 = 0.54–0.75) between the techniques at all intervals. Comparison of the parameters from the Michaelis–Menten model resulted in correlations (R2 = 0.83) between the sizes of the estimated forage fractions, but not between parameter determining the rates of their degradation. CONCLUSIONS: Both the GP and FB techniques have the potential to estimate the degradation of individual feed fractions in forages. Further studies in which the in vitro parameters are evaluated against livestock data, are needed to confirm the findings of this study, however. Copyright © 2007 Society of Chemical Industry 相似文献
28.
BE Moen BE Hollund M Berntsen R Flo KR Kyvik T Riise 《Canadian Metallurgical Quarterly》1995,39(3):347-361
Work on deck on eight oil product tankers was examined. The purpose was to evaluate the need for improvement of the working environment to reduce the risk of occupational cancer. Benzene, polyaromatic hydrocarbons (PAHs) and organic lead compounds were sampled, and the crew answered a questionnaire on acute health effects. By area monitoring, benzene was generally found to be in the range from the detection limit, of 0.01 ppm, up to 1.15 ppm, but one tanker which loaded gasoline with the hatches open had levels up to 55 ppm. Personal monitoring showed exposure levels in the range 0.01-1.15 ppm. The PAH-levels and the levels of organic lead were low. No seamen were observed using respiratory protective equipment. Central nervous system symptoms were reported by the crew with the highest exposures to benzene although benzene may not be the only cause. The exposure to benzene and other hydrocarbons on the deck of oil product tankers ought to be reduced. 相似文献
29.
Lindow N Baum D Hege HC 《IEEE transactions on visualization and computer graphics》2011,17(12):2025-2034
Visual analysis is widely used to study the behavior of molecules. Of particular interest are the analysis of molecular interactions and the investigation of binding sites. For large molecules, however, it is difficult to detect possible binding sites and paths leading to these sites by pure visual inspection. In this paper, we present new methods for the computation and visualization of potential molecular paths. Using a novel filtering method, we extract the significant paths from the Voronoi diagram of spheres. For the interactive visualization of molecules and their paths, we present several methods using deferred shading and other state-of-the-art techniques. To allow for a fast overview of reachable regions of the molecule, we illuminate the molecular surface using a large number of light sources placed on the extracted paths. We also provide a method to compute the extension surface of selected paths and visualize it using the skin surface. Furthermore, we use the extension surface to clip the molecule to allow easy visual tracking of even deeply buried paths. The methods are applied to several proteins to demonstrate their usefulness. 相似文献
30.