全文获取类型
收费全文 | 955篇 |
免费 | 61篇 |
专业分类
电工技术 | 9篇 |
化学工业 | 260篇 |
金属工艺 | 15篇 |
机械仪表 | 15篇 |
建筑科学 | 16篇 |
能源动力 | 40篇 |
轻工业 | 197篇 |
水利工程 | 3篇 |
石油天然气 | 3篇 |
无线电 | 83篇 |
一般工业技术 | 148篇 |
冶金工业 | 74篇 |
原子能技术 | 3篇 |
自动化技术 | 150篇 |
出版年
2023年 | 9篇 |
2022年 | 37篇 |
2021年 | 32篇 |
2020年 | 21篇 |
2019年 | 37篇 |
2018年 | 32篇 |
2017年 | 34篇 |
2016年 | 35篇 |
2015年 | 35篇 |
2014年 | 34篇 |
2013年 | 69篇 |
2012年 | 56篇 |
2011年 | 75篇 |
2010年 | 46篇 |
2009年 | 57篇 |
2008年 | 60篇 |
2007年 | 30篇 |
2006年 | 46篇 |
2005年 | 37篇 |
2004年 | 36篇 |
2003年 | 26篇 |
2002年 | 21篇 |
2001年 | 18篇 |
2000年 | 9篇 |
1999年 | 11篇 |
1998年 | 22篇 |
1997年 | 14篇 |
1996年 | 13篇 |
1995年 | 11篇 |
1994年 | 5篇 |
1993年 | 6篇 |
1992年 | 3篇 |
1991年 | 5篇 |
1990年 | 2篇 |
1989年 | 9篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1976年 | 4篇 |
1975年 | 1篇 |
1973年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有1016条查询结果,搜索用时 10 毫秒
991.
Salvador M. Aceves Gene D. Berry Joel Martinez-Frias Francisco Espinosa-Loza 《International Journal of Hydrogen Energy》2006,31(15):2274-2283
This paper describes an alternative technology for storing hydrogen fuel onboard vehicles. Insulated pressure vessels are cryogenic capable vessels that can accept cryogenic liquid hydrogen, cryogenic compressed gas or compressed hydrogen gas at ambient temperature. Insulated pressure vessels offer advantages over conventional storage approaches. Insulated pressure vessels are more compact and require less carbon fiber than compressed hydrogen vessels. They have lower evaporative losses than liquid hydrogen tanks, and are lighter than metal hydrides.
The paper outlines the advantages of insulated pressure vessels and describes the experimental and analytical work conducted to verify that insulated pressure vessels can be safely used for vehicular hydrogen storage. Insulated pressure vessels have successfully completed a series of certification tests. A series of tests have been selected as a starting point toward developing a certification procedure. An insulated pressure vessel has been installed in a hydrogen fueled truck and tested over a six month period. 相似文献
992.
Three different types of commercially available RS (one RS type 2 and two RS type 3) were incorporated in a batter formula
and their influence on the rheological properties of the raw batter and on the batter pick-up, texture, colour, and consumer
acceptability of the final battered fried product were investigated. RS incorporation affected the rheological properties
of the raw batter compared with a control (without RS), although no relation between RS type and the flow and viscoelastic
properties was found. In comparison to the control batter, replacement of wheat flour with Novelose 330 (RS3 type) increased
significantly batter consistency and the values of the viscoelastic moduli G′ and G″, while replacement with both C*Actistar
11700 (RS3 type) or Hi-maize 260 (RS2 type) produced the opposite effect. Instrumental colour was the only property that gave
a clear relationship with the type of RS; the two RS3 starches developed a darker colour than the control and the RS2 starch.
The RS2 starch showed the best acceptability evaluated by a consumer panel. All the RS types assayed are considered successful
to be used in battered food. 相似文献
993.
Xiaopu Wang Xiang‐Zhong Chen Carlos C. J. Alcntara Semih Sevim Marcus Hoop Anastasia Terzopoulou Carmela de Marco Chengzhi Hu Andrew J. de Mello Paolo Falcaro Shuhei Furukawa Bradley J. Nelson Josep Puigmartí‐Luis Salvador Pan 《Advanced materials (Deerfield Beach, Fla.)》2019,31(27)
Motile metal?organic frameworks (MOFs) are potential candidates to serve as small‐scale robotic platforms for applications in environmental remediation, targeted drug delivery, or nanosurgery. Here, magnetic helical microstructures coated with a kind of zinc‐based MOF, zeolitic imidazole framework‐8 (ZIF‐8), with biocompatibility characteristics and pH‐responsive features, are successfully fabricated. Moreover, it is shown that this highly integrated multifunctional device can swim along predesigned tracks under the control of weak rotational magnetic fields. The proposed systems can achieve single‐cell targeting in a cell culture media and a controlled delivery of cargo payloads inside a complex microfluidic channel network. This new approach toward the fabrication of integrated multifunctional systems will open new avenues in soft microrobotics beyond current applications. 相似文献
994.
995.
L. Van de steene J.P. Tagutchou F.J. Escudero Sanz S. Salvador 《Chemical engineering science》2011,66(20):4499
In wood gasification, oxidation of char particles by H2O, CO2 or O2 plays a major role in the performance and efficiency of air gasifiers. These reactions are generally analyzed under carefully design and controlled laboratory conditions, using either micro-samples to focus on the reaction kinetics or large spherical particles, but rarely using the real shape encountered in industrial processes. The objective of this work was to conduct a complete parametric study on char gasification kinetics at particle scale in operating conditions like those of industrial applications. Experimental results from a macro-Thermo Gravimetric reactor are compared to those from a char particle model, which analyzes reactivity versus conversion through the surface function F(X).We first show that particle thickness is a representative dimension of a char particle with respect to its apparent kinetics. Second, considering the three reactions independently, we compared the influence of temperature (800–1050 °C) and reacting gas partial pressure (0.03–0.4 atm) and determined the intrinsic kinetic parameters and surface function F(X). Simulations provided profiles of temperature and gas concentrations within the particle, mainly revealing internal mass diffusion limitation. The experimental data base proposed and the model results improve our understanding of the gasification reaction and support the elaboration of process models. 相似文献
996.
997.
998.
Martin Genet Manuel Houmard Salvador Eslava Eduardo Saiz Antoni P. Tomsia 《Journal of the European Ceramic Society》2013,33(4):679-688
This paper introduces our approach to modeling the mechanical behavior of cellular ceramics, through the example of calcium phosphate scaffolds made by robocasting for bone–tissue engineering. The Weibull theory is used to deal with the scaffolds’ constitutive rods statistical failure, and the Sanchez-Palencia theory of periodic homogenization is used to link the rod- and scaffold-scales. Uniaxial compression of scaffolds and three-point bending of rods were performed to calibrate and validate the model. If calibration based on rod-scale data leads to over-conservative predictions of scaffold's properties (as rods’ successive failures are not taken into account), we show that, for a given rod diameter, calibration based on scaffold-scale data leads to very satisfactory predictions for a wide range of rod spacing, i.e. of scaffold porosity, as well as for different loading conditions. This work establishes the proposed model as a reliable tool for understanding and optimizing cellular ceramics’ mechanical properties. 相似文献
999.
Mónica Vicent Emilie Bannier Rodrigo Moreno Ma Dolores Salvador Enrique Sánchez 《Journal of the European Ceramic Society》2013,33(15-16):3313-3324
In this work, Al2O3–13 wt% TiO2 submicron-nanostructured powders were deposited using atmospheric plasma spraying. The feedstocks were obtained by spray drying two starting suspensions of different solids content, prepared by adding nanosized TiO2 and submicron-sized Al2O3 powders to water. The spray-dried granules were heat-treated to reduce their porosity and the powders were fully characterised in both untreated and thermally treated state. Comparison with two commercial feedstocks was carried out. Characterisation allowed a temperature for the thermal treatment to be chosen on the basis of the sprayability of the feedstock and the preservation as much as possible of the submicron-sized structure of the unfired agglomerates.Optimisation of the deposition conditions enabled the reconstituted powders to be successfully deposited, yielding coatings that were well bonded to the substrate. The coating microstructure, characterised by SEM, was mostly formed by a matrix of fully molten particles where the presence of semi-molten feedstock agglomerates was also observed.Moreover, microhardness, toughness, adhesion and tribological behaviours were determined, and the impact of the granule characteristics on these properties was studied. It was found that changing the feedstock characteristics allows controlling the coating quality and properties. In general, good mechanical properties were obtained using a feedstock comprising a binary mixture of submicrometric Al2O3 and nanometric TiO2 particles in the spray-dried powder. 相似文献
1000.
Patrizia Marinelli Virginia Castillo Salvador Ventura 《International journal of molecular sciences》2013,14(9):17830-17844
Amyloid fibril formation is implicated in different human diseases. The transition between native α-helices and nonnative intermolecular β-sheets has been suggested to be a trigger of fibrillation in different conformational diseases. The FF domain of the URN1 splicing factor (URN1-FF) is a small all-α protein that populates a molten globule (MG) at low pH. Despite the fact that this conformation maintains most of the domain native secondary structure, it progressively converts into β-sheet enriched and highly ordered amyloid fibrils. In this study, we investigated if 2,2,2-trifluoroethanol (TFE) induced conformational changes that affect URN1-FF amyloid formation. Despite TFE having been shown to induce or increase the aggregation of both globular and disordered proteins at moderate concentrations, we demonstrate here that in the case of URN1-FF it reinforces its intrinsic α-helical structure, which competes the formation of aggregated assemblies. In addition, we show that TFE induces conformational diversity in URN1-FF fibrils, in such a way that the fibrils formed in the presence and absence of the cosolvent represent different polymorphs. It is suggested that the effect of TFE on both the soluble and aggregated states of URN1-FF depends on its ability to facilitate hydrogen bonding. 相似文献