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排序方式: 共有1483条查询结果,搜索用时 210 毫秒
951.
Emilie Malard Dominique Kervadec Otavio Gil Yves Lefevre Sophie Malard 《Electrochimica acta》2008,54(1):8-13
Metallic infrastructure immersed in natural seawater is exposed to important corrosion phenomena, which are sometimes characterised by microorganism influenced corrosion. The presence of sulphide-producing bacteria is generally associated with catastrophic cases of material degradation. In this work, commercial steel grades (carbon steels and low-alloy steels) are immersed for approximately 1 year in two types of natural seawater, which contain different concentrations of sulphide-producing bacteria. Gravimetric, microbiological, and electrochemical measurements and corrosion product analyses indicate that in seawater the observed corrosion phenomenon is composed of two different phases. The first phase is characterized by decreased corrosion kinetics correlated with a higher concentration of sessile sulphide-producing bacteria and the formation of sulphur-containing chemical species. The second phase is marked by an increased rate of corrosion. This multidisciplinary study demonstrates the complexity of the interactions between steels and bacteria. The presence of alloying elements in the steel composition affects the rate of corrosion and growth patterns of sessile sulphide-producing bacteria. At the same time, the presence of sulphide-producing bacteria affects in the process of steel corrosion in natural seawater. 相似文献
952.
953.
Sriniketh Srinivasan Julien Billeter Dominique Bonvin 《American Institute of Chemical Engineers》2019,65(4):1211-1221
Modeling chemical reaction systems is an important but complex task. The identified kinetic model must be able to explain all the underlying rate processes such as chemical reactions and heat and mass transfers. Traditionally, the modeling task is carried out using a simultaneous approach, which, for model prediction, requires having model candidates for all rate processes. The simultaneous approach leads to statistically optimal parameter estimates in the maximum-likelihood sense, but it can be computationally expensive due to its combinatorial nature. The incremental approach, via either rates or extents, was introduced as an alternative to the simultaneous approach. It is characterized by the fact that each rate process can be modeled individually, that is, independently of the other rate processes. Hence, the incremental approach is computationally more attractive, however, at the price of not guaranteeing statistically optimal parameter estimates. This article proposes a novel sequential approach that combines the advantages of the incremental and simultaneous approaches. © 2019 American Institute of Chemical Engineers AIChE J, 65: 1211–1221, 2019 相似文献
954.
Marco Domp Francisco J. Cedano‐Serrano Olaf Heckert Nicoline van den Heuvel Jasper van der Gucht Yvette Tran Dominique Hourdet Costantino Creton Marleen Kamperman 《Advanced materials (Deerfield Beach, Fla.)》2019,31(21)
Sandcastle worms have developed protein‐based adhesives, which they use to construct protective tubes from sand grains and shell bits. A key element in the adhesive delivery is the formation of a fluidic complex coacervate phase. After delivery, the adhesive transforms into a solid upon an external trigger. In this work, a fully synthetic in situ setting adhesive based on complex coacervation is reported by mimicking the main features of the sandcastle worm's glue. The adhesive consists of oppositely charged polyelectrolytes grafted with thermoresponsive poly(N‐isopropylacrylamide) (PNIPAM) chains and starts out as a fluid complex coacervate that can be injected at room temperature. Upon increasing the temperature above the lower critical solution temperature of PNIPAM, the complex coacervate transitions into a nonflowing hydrogel while preserving its volume—the water content in the material stays constant. The adhesive functions in the presence of water and bonds to different surfaces regardless of their charge. This type of adhesive avoids many of the problems of current underwater adhesives and may be useful to bond biological tissues. 相似文献
955.
Muller Dominique; Judd Charles M.; Yzerbyt Vincent Y. 《Canadian Metallurgical Quarterly》2005,89(6):852
Procedures for examining whether treatment effects on an outcome are mediated and/or moderated have been well developed and are routinely applied. The mediation question focuses on the intervening mechanism that produces the treatment effect. The moderation question focuses on factors that affect the magnitude of the treatment effect. It is important to note that these two processes may be combined in informative ways, such that moderation is mediated or mediation is moderated. Although some prior literature has discussed these possibilities, their exact definitions and analytic procedures have not been completely articulated. The purpose of this article is to define precisely both mediated moderation and moderated mediation and provide analytic strategies for assessing each. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
956.
Manuel Pezzin Julien Keignart Norbert Daniele Sébastien de Rivaz Benoît Denis Dominique Morche Philippe Rouzet Régis Catenoz Nils Rinaldi 《电信纪事》2003,58(3-4):464-506
A new data transmission technique is about to create a revolution in the field of wireless local area networks. This new method, called Ultra Wideband, is based on the transmission of data through the communication channel below the noise floor. It involves transmitting very short duration pulses, which has the effect of spreading the signal energy across a wide frequency range. The objective of this article is to report on the state of the art in this research area, and to outline the main advantages of this promising data transmission method. 相似文献
957.
958.
Dominique Bonvin 《Journal of Process Control》1998,8(5-6):355-368
This paper presents a personal, thus necessarily subjective, view of the operation of batch and semi-batch reactors. The emphasis is on safety, product quality and scale-up. Key characteristics of discontinuous reaction systems are discussed, along with the resulting implications for monitoring, control and optimization. The industrial needs are compared with the research solutions proposed by academia. It is argued that, in industry, measurement and modeling issues are often more important than the algorithmic aspects related to the computation of control and optimization strategies. Major challenges and selected research opportunities are discussed. 相似文献
959.
F Bani-Sadr S Dominique I Gueit C Peillon G Humbert 《Canadian Metallurgical Quarterly》1997,18(8):605-610
Spontaneous pneumothorax in HIV infected patients are mostly due to a sub-pleural necrotizing pneumonitis most often related to Pneumocystis carinii pneumonia. From our experience of nine patients and a review of the literature, we describe the clinical characteristics and therapeutic management and confirm the frequent failure of simple chest tube drainage and the high morbidity and mortality rate despite treatment. An aggressive stepped-care management of thoracoscopic talc poudrage as initial therapy should be evaluated. 相似文献
960.
Penaranda Foix F.L. Catala-Civera J.M. Canos-Marin A.J. Garcia-Bafios B. 《Electronics letters》2007,43(24)
One of the most widely used techniques for dielectric material characterisation is the partially filled circular cavity. To make these measurements the dielectric material is introduced into the cavity through a circular hole whose effects in the resonant frequency are traditionally neglected. A very simple expression is introduced to model this frequency deviation that improves the classical one. It takes into account the saturation effect that appears when materials with high permittivities are measured. The expression is obtained using circuital analysis and monomode approximation. 相似文献