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11.
The historical evolution of interfaces to databases at the application programming level is analyzed. Emphasis is put on aspects of the data manipulation operations rather than on the data model that they address.Four phases are distinguished in this evolution: “call” interfaces, simple language extensions, non-procedural languages embedded in general purpose languages, and integrated languages.The evolution is explained in terms of the growing needs for more reliable programs written in high level languages, for which programmer efficiency is more important than machine efficiency. 相似文献
12.
Vision-Based SLAM: Stereo and Monocular Approaches 总被引:1,自引:0,他引:1
Thomas Lemaire Cyrille Berger Il-Kyun Jung Simon Lacroix 《International Journal of Computer Vision》2007,74(3):343-364
Building a spatially consistent model is a key functionality to endow a mobile robot with autonomy. Without an initial map
or an absolute localization means, it requires to concurrently solve the localization and mapping problems. For this purpose,
vision is a powerful sensor, because it provides data from which stable features can be extracted and matched as the robot
moves. But it does not directly provide 3D information, which is a difficulty for estimating the geometry of the environment.
This article presents two approaches to the SLAM problem using vision: one with stereovision, and one with monocular images.
Both approaches rely on a robust interest point matching algorithm that works in very diverse environments. The stereovision
based approach is a classic SLAM implementation, whereas the monocular approach introduces a new way to initialize landmarks.
Both approaches are analyzed and compared with extensive experimental results, with a rover and a blimp. 相似文献
13.
Osana Helena P.; Lacroix Guy L.; Tucker Bradley J.; Idan Einat; Jabbour Guillaume W. 《Canadian Metallurgical Quarterly》2007,99(4):888
This study extended the work of S. Siddiqui, R. F. West, and K. E. Stanovich (1998), who studied the link between general print exposure and syllogistic reasoning. It was hypothesized that exposure to certain text structures that contain well-delineated logical forms, such as popularized scientific texts, would be a better predictor of deductive reasoning skill than general print exposure, which is not sensitive to the quality of an individual's reading activity. Furthermore, it was predicted that the ability to generate explanatory bridging inferences while reading would also be predictive of syllogistic reasoning. Undergraduate students (N = 112) were tested for vocabulary, nonverbal cognitive ability, exposure to general print, exposure to popularized scientific literature, and the ability to comprehend texts distinguished by the number of inferences that must be generated to support comprehension. Hierarchical multiple regression analyses showed that a combined measure of exposure to general and scientific literature was a significant predictor of syllogistic reasoning ability. Additionally, the ability to comprehend high-inference-load texts was related to solving syllogisms that were inconsistent with world knowledge, indicating an overlap in deductive reasoning skill and text comprehension processes. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
14.
Joris Lacroix Sandrine Pélofy Charline Blatché Marie‐Jeanne Pillaire Sébastien Huet Catherine Chapuis Jean‐Sébastien Hoffmann Aurélien Bancaud 《Small (Weinheim an der Bergstrasse, Germany)》2016,12(43):5963-5970
DNA replication is essential to maintain genome integrity in S phase of the cell division cycle. Accumulation of stalled replication forks is a major source of genetic instability, and likely constitutes a key driver of tumorigenesis. The mechanisms of regulation of replication fork progression have therefore been extensively investigated, in particular with DNA combing, an optical mapping technique that allows the stretching of single molecules and the mapping of active region for DNA synthesis by fluorescence microscopy. DNA linearization in nanochannels has been successfully used to probe genomic information patterns along single chromosomes, and has been proposed to be a competitive alternative to DNA combing. Yet this conjecture remains to be confirmed experimentally. Here, two complementary techniques are established to detect the genomic distribution of tracks of newly synthesized DNA in human cells by optical mapping in nanochannels. Their respective advantages and limitations are compared, and applied them to detect deregulations of the replication program induced by the antitumor drug hydroxyurea. The developments here thus broaden the field of applications accessible to nanofluidic technologies, and can be used in the future as part for molecular diagnostics in the context of high throughput cancer drug screening. 相似文献
15.
Y. Balcaen N. Radutoiu J. Alexis J.-D. Beguin L. Lacroix D. Samélor C. Vahlas 《Surface & coatings technology》2011,206(7):1684-1690
This study focuses on the implementation of different aluminum oxide coatings processed by metal-organic chemical vapor deposition from aluminum tri-isopropoxide on commercial Ti6Al4V titanium alloy to improve its high temperature corrosion resistance. Films grown at 350 °C and at 480 °C are amorphous and correspond to formulas AlOOH, and Al2O3, respectively. Those deposited at 700 °C are composed of γ-Al2O3 nanocrystals dispersed in a matrix of amorphous alumina. Their mechanical properties and adhesion to the substrates were investigated by indentation, scratch and micro tensile tests. Hardness and rigidity of the films increase with increasing deposition temperature. The hardness of the coatings prepared at 350 °C and 480 °C is 5.8 ± 0.7 GPa and 10.8 ± 0.8 GPa respectively. Their Young's modulus is 92 ± 8 GPa (350 °C) and 155 ± 6 GPa (480 °C). Scratch tests cause adhesive failures of the films grown at 350 °C and 480 °C whereas cohesive failure is observed for the nanocrystalline one, grown at 700 °C. Micro tensile tests show a more progressive cracking of the latter films than on the amorphous ones. The films allow maintaining good mechanical properties after corrosion with NaCl deposit during 100 h at 450 °C. After corrosion test only the film deposited at 700 °C yields an elongation at break comparable to that of the as processed samples without corrosion. The as established processing–structure–properties relation paves the way to engineer MOCVD aluminum oxide complex coatings which meet the specifications of the high temperature corrosion protection of titanium alloys with regard to the targeted applications. 相似文献
16.
17.
Impact of nisin producing culture and liposome-encapsulated nisin on ripening of Lactobacillus added-Cheddar cheese 总被引:2,自引:0,他引:2
This study aimed to evaluate the effects of incorporating liposome-encapsulated nisin Z, nisin Z producing Lactococcus lactis ssp. lactis biovar. diacetylactis UL719, or Lactobacillus casei-casei L2A adjunct culture into cheese milk on textural, physicochemical and sensory attributes during ripening of Cheddar cheese. For this purpose, cheeses were made using a selected nisin tolerant cheese starter culture. Proteolysis, free fatty acid production, rheological parameters and hydrophilic/hydrophobic peptides evolution were monitored over 6 mo ripening. Sensory quality of cheeses was evaluated after 6 mo. Incorporating the nisin-producing strain into cheese starter culture increased proteolysis and lipolysis but did not significantly affect cheese rheology. Liposome-encapsulated nisin did not appear to affect cheese proteolysis, rheology and sensory characteristics. The nisinogenic strain increased the formation of both hydrophilic and hydrophobic peptides present in the cheese water extract. Sensory assessment indicated that acidic and bitter tastes were enhanced in the nisinogenic strain-containing cheese compared to control cheese. Incorporating Lb. casei and the nisinogenic culture into cheese produced a debittering effect and improved cheese flavor quality. Cheeses with added Lb. casei and liposome-encapsulated nisin Z exhibited the highest flavor intensity and were ranked first for sensory characteristics. 相似文献
18.
Argues that Canadian provincial legislation regulating the practice of medicine ignores the common goals of medicine and health psychology and therefore may impede the practice of health psychology in Canada. It is suggested that the contributions made by health psychology practitioners in the treatment of physical injuries or diseases be recognized. (French abstract) (PsycINFO Database Record (c) 2011 APA, all rights reserved) 相似文献
19.
Dorothea F K Rawn Sue C Quade J Brian Shields Giacomo Conca Wing-Fung Sun Gladys M A Lacroix Mark Smith André Fouquet André Bélanger 《Food Additives & Contaminants》2007,24(2):149-155
Apple trees in an orchard in Quebec, Canada were treated, following label directions, with the fungicide captan (1,2,3,6-tetrahydro-N-(trichloromethylthio)phthalimide) during the 2003 agricultural season. A total of 142 apples from three rows of trees were selected for determination of captan by GC/MS. Individual apples were found to contain captan levels ranging from 16.9 to 6350 ng g-1. Only two individual apple samples exceeded the Canadian maximum residue limit (5000 ng g-1) for captan in apples. Six composite samples, comprising half portions of eight individual apples, were analysed from each of the three experimental rows. Composite samples ranged in concentration from 166 to 2620 ng g-1. The greatest uncertainty associated with the measured concentrations was due to variability among apples rather than the measurement of residue levels. 相似文献
20.