全文获取类型
收费全文 | 3540篇 |
免费 | 216篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 25篇 |
综合类 | 4篇 |
化学工业 | 868篇 |
金属工艺 | 43篇 |
机械仪表 | 61篇 |
建筑科学 | 127篇 |
矿业工程 | 10篇 |
能源动力 | 139篇 |
轻工业 | 635篇 |
水利工程 | 37篇 |
石油天然气 | 10篇 |
无线电 | 293篇 |
一般工业技术 | 486篇 |
冶金工业 | 152篇 |
原子能技术 | 34篇 |
自动化技术 | 834篇 |
出版年
2024年 | 1篇 |
2023年 | 29篇 |
2022年 | 98篇 |
2021年 | 163篇 |
2020年 | 94篇 |
2019年 | 114篇 |
2018年 | 121篇 |
2017年 | 128篇 |
2016年 | 164篇 |
2015年 | 108篇 |
2014年 | 210篇 |
2013年 | 293篇 |
2012年 | 282篇 |
2011年 | 287篇 |
2010年 | 218篇 |
2009年 | 228篇 |
2008年 | 192篇 |
2007年 | 178篇 |
2006年 | 107篇 |
2005年 | 110篇 |
2004年 | 79篇 |
2003年 | 92篇 |
2002年 | 70篇 |
2001年 | 39篇 |
2000年 | 31篇 |
1999年 | 39篇 |
1998年 | 60篇 |
1997年 | 49篇 |
1996年 | 37篇 |
1995年 | 24篇 |
1994年 | 19篇 |
1993年 | 18篇 |
1992年 | 11篇 |
1991年 | 6篇 |
1990年 | 10篇 |
1989年 | 11篇 |
1988年 | 4篇 |
1987年 | 6篇 |
1986年 | 4篇 |
1985年 | 3篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1981年 | 4篇 |
1979年 | 1篇 |
1978年 | 4篇 |
1977年 | 1篇 |
1976年 | 7篇 |
排序方式: 共有3758条查询结果,搜索用时 578 毫秒
151.
152.
153.
Software and Systems Modeling - Querying large models efficiently often imposes high demands on system resources such as memory, processing time, disk access or network latency. The situation... 相似文献
154.
155.
156.
Freddy Boscn Marcel Meeuwisse Dirk Mestach Maria Paulis Maria Jesus Barandiaran Silfredo Javier Bohrquez 《大分子材料与工程》2019,304(7)
The benefits of polymerizing very insoluble monomers in aqueous media, avoiding the use of energy‐intensive procedures, by implementing two novel synthesis techniques based on the emulsifier combination in emulsion polymerization and on miniemulsification by phase inversion temperature are investigated. The performance of standalone polymers consisting of monomers, namely lauryl methacrylate, isobornyl acrylate, and 1H,1H,2H,2H‐perfluorodecyl acrylate, and of formulated binders with these monomers incorporated either through blending or in situ polymerization, is evaluated with special emphasis on their water‐barrier properties (e.g., uptake, whitening, immersion, and vapor resistance) and on their chemical resistance. The performance of the standalone polymers is found to be similar to that of polymers prepared by high‐shear miniemulsion polymerization, while the performance of the formulated binders is generally superior to a commercial coating formulation based on a binder recommended for water resistance. 相似文献
157.
F. Javier Fuentes Vincent Trouvé Emily Blessing Jean-Jacques Cordier Jens Reich 《Fusion Engineering and Design》2013,88(6-8):597-601
The optimization of the manufacturing/assembly tolerances and processes in ITER Experimental Nuclear Fusion Device is one of the key tasks to optimize the fabrication cost, to prevent problems during assembly and to ensure that the critical homogeneity of the magnetic field and the positioning requirements of the plasma facing components can be achieved. This task is further complicated by the strong interplay among the various Tokamak systems, as for instance in the inner region of the machine where the clearances between Central Solenoid, Toroidal Field Coils, Thermal Shield, Vacuum Vessel and In-Vessel components have been minimized for their large influence on the magnetic flux and the overall machine cost.A 3D tolerance simulation analysis of ITER Tokamak machine has been developed based on 3DCS dedicated software. The dimensional variation model is representative of Tokamak functional tolerances and processes, predicting accurate values for the amount of variation on critical areas. In addition, dimensional simulations help to determine the key tolerances that contribute to a particular variation.This paper describes the current status of the Tokamak dimensional variation studies and its management plan, highlighting the status of compliance of allocated tolerances with input requirements. Management of risk issues and corrective actions are also described. 相似文献
158.
Rutao Luo E. Fabian Cardozo Michael J. Piovoso Hulin Wu Maria J. Buzon Javier Martinez-Picado Ryan Zurakowski 《Journal of the Royal Society Interface》2013,10(84)
A model of reservoir activation and viral replication is introduced accounting for the production of 2-LTR HIV-1 DNA circles following antiviral intensification with the HIV integrase inhibitor raltegravir, considering contributions of de novo infection events and exogenous sources of infected cells, including quiescent infected cell activation. The model shows that a monotonic increase in measured 2-LTR concentration post intensification is consistent with limited de novo infection primarily maintained by sources of infected cells unaffected by raltegravir, such as quiescent cell activation, while a transient increase in measured 2-LTR concentration is consistent with significant levels of efficient (R0 > 1) de novo infection. The model is validated against patient data from the INTEGRAL study and is shown to have a statistically significant fit relative to the null hypothesis of random measurement variation about a mean. We obtain estimates and confidence intervals for the model parameters, including 2-LTR half-life. Seven of the 13 patients with detectable 2-LTR concentrations from the INTEGRAL study have measured 2-LTR dynamics consistent with significant levels of efficient replication of the virus prior to treatment intensification. 相似文献
159.
Aída R. Callejas-Cárdenas Irma Caro Carolina Blanco Luz H. Villalobos-Delgado Nuria Prieto Raúl Bodas Francisco J. Giráldez Javier Mateo 《Meat science》2014
The effects of vacuum ageing on the quality changes of lamb steaks during retail display were assessed. Biceps femoris and Quadriceps femoris muscles from thirty early fattening lambs fed barley straw and concentrate or alfalfa and concentrate were used. Half of the muscles were vacuum aged for three weeks (VA), and the other half were not aged (control). Control and VA muscles were sliced and aerobically displayed. Weight loss, pH, aldehyde contents, instrumental color characteristics and color acceptance were measured at display days 1, 3, 7 and 14. At day 1 redness was higher in VA lamb. However, redness of VA lamb decreases more rapidly during further storage. Redness and color acceptance decreased in VA lamb from day 3, whereas in not-aged lamb the decrease was observed from day 7 onwards. From days 7 to 14 a drop of color acceptance accompanied by an increase in pH and a decrease in lightness was observed in control and VA lamb. 相似文献
160.
Beatriz Valle Aingeru Remiro Naiara García-Gómez Ana G Gayubo Javier Bilbao 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2019,94(3):670-689
Recent advances in lignocellulosic biomass valorization for producing fuels and commodities (olefins and BTX aromatics) are gathered in this paper, with a focus on the conversion of bio-oil (produced by fast pyrolysis of biomass). The main valorization routes are: (i) conditioning of bio-oil (by esterification, aldol condensation, ketonization, in situ cracking, and mild hydrodeoxygenation) for its use as a fuel or stable raw material for further catalytic processing; (ii) production of fuels by deep hydrodeoxygenation; (iii) ex situ catalytic cracking (in line) of the volatiles produced in biomass pyrolysis, aimed at the selective production of olefins and aromatics; (iv) cracking of raw bio-oil in units designed with specific objectives concerning selectivity; and (v) processing in fluidized bed catalytic cracking (FCC) units. This review deals with the technological evolution of these routes, in terms of catalysts, reaction conditions, reactors, and product yields. A study has been carried out on the current state-of-knowledge of the technological capacity, advantages and disadvantages of the different routes, as well as on the prospects for the implementation of each route within the scope of the Sustainable Refinery. © 2018 Society of Chemical Industry 相似文献