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21.
Adriana Vlasa Simona Varvara Aurel Pop Caius Bulea Liana Maria Muresan 《Journal of Applied Electrochemistry》2010,40(8):1519-1527
The present paper aims to investigate the electrodeposition on steel substrate and the corrosion behavior of Zn–TiO2 nanocomposite coatings. Zn–TiO2 composite coatings were electrodeposited on OL 37 steel from an electrolyte containing ZnCl2, KCl, HBO3 (pH 5.7) brightening agents and dispersed nanosized TiO2. Corrosion measurements were performed in 0.2 g L−1 (NH4)2SO4 solution (pH 3) by using electrochemical methods (open-circuit potential measurements, polarization curves, electrochemical
impedance spectroscopy). The results of electrochemical measurements were corroborated with those obtained by using non-electrochemical
methods (X-ray diffraction, atomic force microscopy and scanning electron microscopy). The results indicate that the composite
coatings exhibit higher corrosion resistance as compared to pure Zn coatings and a non-linear dependence of their polarization
resistance on TiO2 concentration in the plating bath was found. The importance of TiO2 nature and concentration regarding the properties of the composite coatings was demonstrated. 相似文献
22.
Otilia Catanescu Nicolae Hurduc Dan Scutaru Aurel Stoleru Cristofor I. Simionescu 《大分子材料与工程》1999,273(1):91-95
Polyethers based on bis(2-chloroethyl) ether and various bisphenols were obtained using a phase transfer catalysis technique in a liquid/liquid system. 4,4′-Dihydroxyazobenzene, 4,4′-dihydroxybiphenyl, bisphenol A, 2,7-dihydroxynaphthalene and 4,4′-dihydroxydiphenyl) sulfide were used. Only the polymers with azobenzene and biphenyl units exhibited mesophases, since the others have semi-crystalline or amorphous structures. The polymers were characterized by 1H NMR, DSC and optical microscopy in polarized light. The molecular weights of the samples were low, situated in the oligomeric domain. The various transfer rates of the bisphenols from the aqueous to the organic phase, in some cases, led to very different copolymerization ratios as compared to the feed ratios. The LC polymers exhibited monotropic mesophases, probably for conformational reasons. A comparison between similar polyether structures containing the diethyletheric spacer and an oxetanic one was effectuated. 相似文献
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Julian S. Cashmore Marco Apolloni Antonio Braga Onur Caglar Valentina Cervetto Yves Fenner Stephanie Goldbach‐Aschemann Celine Goury Jochen E. Htzel Takashi Iwahashi Jiri Kalas Masayuki Kitamura Markus Klindworth Markus Kupich George‐Felix Leu Jun Lin Marie‐Helene Lindic Paolo A. Losio Tomas Mates Daisuke Matsunaga Bogdan Mereu Xuan‐Viet Nguyen Ioanna Psimoulis Sergej Ristau Tobias Roschek Aurel Salabas Elena Lorena Salabas Ivan Sinicco 《Progress in Photovoltaics: Research and Applications》2015,23(11):1441-1447
Mass‐adoption of thin‐film silicon (TF‐Si) photovoltaic modules as a renewable energy source can be viable if the cost of electricity production from the module is competitive with conventional energy solutions. Increased module performance (electrical power generated) is an approach to reduce this cost. Progress towards higher conversion efficiencies for ‘champion’ large area modules paves the way for mass‐production module performance to follow. At TEL Solar AG, Trübbach, Switzerland, significant progress in the absolute stabilized module conversion efficiency has been achieved through optimized solar cell design that integrates high‐quality amorphous and microcrystalline TF‐Si‐deposited materials with efficient light management and transparent conductive oxide layers in a tandem MICROMORPH™ module. This letter reports a world record large area (1.43 m2) stabilized module conversion efficiency of 12.34% certified by the European Solar Test Installation; an increase of more than 1.4% absolute compared with the previous record for a TF‐Si triple junction large area module. This breakthrough result generates more than 13.2% stabilized efficiency from each equivalent 1 cm2 of the active area of the full module. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
24.
Raluca Maria Boteanu Viorel-Iulian Suica Elena Uyy Luminita Ivan Aurel Cerveanu-Hogas Razvan Gheorghita Mares Maya Simionescu Alexandru Schiopu Felicia Antohe 《International journal of molecular sciences》2022,23(9)
Prognosis after myocardial infarction (MI) varies greatly depending on the extent of damaged area and the management of biological processes during recovery. Reportedly, the inhibition of the pro-inflammatory S100A9 reduces myocardial damage after MI. We hypothesize that a S100A9 blockade induces changes of major signaling pathways implicated in post-MI healing. Mass spectrometry-based proteomics and gene analyses of infarcted mice left ventricle were performed. The S100A9 blocker (ABR-23890) was given for 3 days after coronary ligation. At 3 and 7 days post-MI, ventricle samples were analyzed versus control and Sham-operated mice. Blockade of S100A9 modulated the expressed proteins involved in five biological processes: leukocyte cell–cell adhesion, regulation of the muscle cell apoptotic process, regulation of the intrinsic apoptotic signaling pathway, sarcomere organization and cardiac muscle hypertrophy. The blocker induced regulation of 36 proteins interacting with or targeted by the cellular tumor antigen p53, prevented myocardial compensatory hypertrophy, and reduced cardiac markers of post-ischemic stress. The blockade effect was prominent at day 7 post-MI when the quantitative features of the ventricle proteome were closer to controls. Blockade of S100A9 restores key biological processes altered post-MI. These processes could be valuable new pharmacological targets for the treatment of ischemic heart. Mass spectrometry data are available via ProteomeXchange with identifier PXD033683. 相似文献
25.
Is it possible, and to what extent feasible, for link schedulers and buffer managers in multimedia networks with propagation delays to relieve effectively congestion by means of feedback signaling? We show that a proactive cooperative control algorithm for distributed resource scheduling and buffer management obviates the problem of propagation delays. The algorithm is based on traffic predictions of correlated input traffic streams into network nodes. Nodes projecting to be under stress signal their neighboring upstream nodes for the latter to readjust their flow rates, whileguaranteeing quality of service as negotiated at call setup. Detailed implementations of the adaptive, feedback control mechanisms of distributed asynchronous algorithms that project future overload conditions are presented. The design allows the underlying single-node link scheduling and buffer management algorithm to be run in either a cooperative or a noncooperative mode of operation. 相似文献
26.
With the increasing sizes of high resolution images, their storage and processing directly in the compressed domain has significantly gained importance. Algorithms for compressed domain image processing provide a powerful computational alternative to classical (pixel level) based implementations. While linear algorithms can be applied straightforward to the JPEG compressed images, this is not the case for nonlinear image processing, as for example contrast enhancement algorithms. In this paper a new implementation in the compressed domain of a very efficient contrast enhancement, based on fuzzy set modeling and on a fuzzy intensification operator, is presented. The fuzzy set parameters are adaptively chosen by analyzing the statistics of the image data in the compressed domain, in order to optimally enhance the image contrast. The nonlinear enhancement procedure requires a grey level threshold, for which an adaptive implementation, taking into account the frequency content of each coefficient block in the DCT (Discrete Cosine Transform) encoded JPEG image is proposed. This guarantees the optimal quality at minimum computational cost. The experimental results for a set of various contrast images validate the good performance and functionality of the proposed implementation. 相似文献
27.
No Heading We present a brief account of the most salient properties of vortices in dilute atomic Fermi superfluids near a Feshbach resonance.PACS numbers: 03.75.Ss 相似文献
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The article proposes a method for teaching advanced urban design to working professionals in Singapore. The article aims to expand the discourse on parametric urban design education by introducing ‘Urban Elements’ as conceptual urban design instruments with an inherent rule-based logic, which can help to bridge gaps in teaching parametric urban design thinking. As case study we present a course developed for and delivered to the Urban Redevelopment Authority (URA) in Singapore in 2017 by the Future Cities Laboratory at the Singapore-ETH Centre. The article reports on the pedagogical method, course results and course feedback. The main difficulties of teaching professionals in parametric urban design are described and possible reasons and improvements are discussed. The results show that participants using the ‘Urban Elements’ method successfully linked theoretical input to urban design problems, applied evidence-based urban design strategies to these problems, and developed parametric definitions to explore the solution spaces of these urban design challenges. The teaching methodology presented opens up a new research field for urban design pedagogy at the intersection of explicating urban design intent, integrating multidisciplinary knowledge and exploring new software driven tools. 相似文献