全文获取类型
收费全文 | 997篇 |
免费 | 67篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 15篇 |
化学工业 | 255篇 |
金属工艺 | 27篇 |
机械仪表 | 24篇 |
建筑科学 | 42篇 |
矿业工程 | 1篇 |
能源动力 | 40篇 |
轻工业 | 150篇 |
水利工程 | 11篇 |
石油天然气 | 2篇 |
无线电 | 40篇 |
一般工业技术 | 176篇 |
冶金工业 | 87篇 |
原子能技术 | 12篇 |
自动化技术 | 184篇 |
出版年
2023年 | 7篇 |
2022年 | 21篇 |
2021年 | 39篇 |
2020年 | 26篇 |
2019年 | 41篇 |
2018年 | 44篇 |
2017年 | 50篇 |
2016年 | 55篇 |
2015年 | 38篇 |
2014年 | 28篇 |
2013年 | 78篇 |
2012年 | 55篇 |
2011年 | 55篇 |
2010年 | 46篇 |
2009年 | 50篇 |
2008年 | 43篇 |
2007年 | 39篇 |
2006年 | 35篇 |
2005年 | 25篇 |
2004年 | 27篇 |
2003年 | 23篇 |
2002年 | 26篇 |
2001年 | 13篇 |
2000年 | 14篇 |
1999年 | 10篇 |
1998年 | 23篇 |
1997年 | 24篇 |
1996年 | 17篇 |
1995年 | 13篇 |
1994年 | 15篇 |
1993年 | 10篇 |
1992年 | 3篇 |
1991年 | 5篇 |
1990年 | 6篇 |
1989年 | 12篇 |
1988年 | 5篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 4篇 |
1984年 | 2篇 |
1983年 | 4篇 |
1982年 | 5篇 |
1981年 | 4篇 |
1980年 | 2篇 |
1979年 | 5篇 |
1978年 | 4篇 |
1977年 | 6篇 |
1976年 | 2篇 |
1975年 | 3篇 |
1968年 | 1篇 |
排序方式: 共有1066条查询结果,搜索用时 234 毫秒
101.
102.
Ana Morales-Rodríguez Alfonso Bravo-León Arturo Domínguez-Rodríguez Manuel Jiménez-Melendo 《Journal of the American Ceramic Society》2008,91(2):500-507
The creep behavior of tetragonal zirconia TZP–Ni cermets with metal contents below, close to, and above the percolation limit has been studied. Compressive creep tests were performed on as-received materials and samples in which the metal phase was chemically removed (ceramic skeletons). The stress exponent and the activation energy for plastic flow are independent of the nickel content and decrease continuously on increasing the stress and/or the temperature; skeleton structures display the same trend, suggesting that creep is controlled by the zirconia matrix. The steady-state constitutive equation for high-purity monolithic zirconia applies to the cermets when the stress is corrected with the porosity and volume fraction of percolated nickel. 相似文献
103.
Correia C. A. B. Conde C. A. N. Dias M. Lurdes 《IEEE transactions on nuclear science》1978,25(1):59-61
A simple single channel analyser using standard components is described. High temperature stability (0.002% / °C) and resolution (? 100 ?V) is achieved. The two-level generator circuits described allow full DC coupling of the input pulses. The performance of these circuits is discussed in detail and experimental results presented. 相似文献
104.
This paper describes the power quality analysis applied on 6?kW building-integrated photovoltaic system (BIPVS) and its economic study. A monitoring system was implemented using virtual instrumentation to measure irradiance, ambient temperature and electric variables of the photovoltaic (PV) system. The study includes a period of one year from September 2015 to August 2016 and for this the IEEE 929-2000 standard guidelines were followed. The results indicate that the power quality parameters: % THDv, frequency, nominal voltage and flicker meet the standard limits mentioned. Economic analysis of the PV system using the RETScreen? software is also presented. The results show a net present value of USD 35,157 for a period of 20 years with an annual energy saving of USD 1750. Greenhouse gas emissions avoided by the use of solar energy are 6.6 t CO2 per year. 相似文献
105.
Arturo Di Fraia Edoardo Miliotti Andrea Maria Rizzo Giulia Zoppi Giuseppe Pipitone Raffaele Pirone Luca Rosi David Chiaramonti Samir Bensaid 《American Institute of Chemical Engineers》2023,69(1):e17652
Lignin-rich stream from lignocellulosic ethanol production was converted into biocrude by continuous hydrothermal liquefaction (HTL) while hydrogen was produced by aqueous phase reforming (APR) of the HTL aqueous by-product. The effects of Na2CO3 and NaOH were investigated both in terms of processability of the feedstock as well as yield and composition of the obtained products. A maximum biocrude yield of 27 wt% was reached in the NaOH-catalyzed runs. A relevant amount of dissolved phenolics were detected in the co-produced aqueous phase (AP), and removed by liquid–liquid extraction using butyl acetate or diethyl ether, preserving the APR catalyst stability and reaching an hydrogen yield up to 146 mmol H2 L−1 AP. Preliminary mass balances integrating HTL and APR showed that the hydrogen provided by APR may account for up to 46% of the hydrogen amount theoretically required for upgrading the HTL biocrude, thus significantly improving the process performance and sustainability. 相似文献
106.
Angela Gallardo-López Arturo Domínguez-Rodríguez Claude Estournès Rachel Marder Rachman Chaim 《Journal of the European Ceramic Society》2012,32(12):3115-3121
Nanocrystalline yttrium oxide, Y2O3 with 110 nm average grain size was plastically deformed between 800 °C and 1100 °C by compression at different strain rates and by creep at different stresses. The onset temperature for plasticity was at 1000 °C. Yield stress was strongly temperature dependent and the strain hardening disappeared at 1100 °C. The polyhedral and equiaxed grain morphology were preserved in the deformed specimens. The experimentally measured and theoretically calculated stress exponent n = 2 was consistent with the plastic deformation by grain boundary sliding. Decrease in the grain size was consistent with decrease in the brittle to ductile transition temperature. 相似文献
107.
Blanca Estela Enríquez‐Fernández Liliana Álvarez de la Cadena y Yañez María Elena Sosa‐Morales 《International Journal of Food Science & Technology》2011,46(6):1231-1237
Stability of palm olein (PO) and a blend 50% palm olein/50% canola oil (POC) during deep‐fat frying at 180 °C of French fries (FF) or chicken nuggets (CN) was studied through the determination of physical and chemical parameters in the fresh and used oils. Degradation at the end of the study resulted in total polar compounds of 12–13.5% for PO and 11.5–14.5% for POC and viscosity of 65–123.3 cP for PO and 63–72.8 cP for POC. Lower peroxide values (5.33–6.32) were obtained for the blend (PO had 5.21–8.55). Food type affected colour parameters and p‐anisidine value of the oils. For CN, the lowest fat content and higher hardness were obtained when they were fried in PO. CN caused a faster deterioration in the oils, in comparison with FF, especially in POC. Gas chromatography allowed to observe differences in fatty acids composition for both used oils. 相似文献
108.
D. C. Martins V. Chu D. M. F. Prazeres J. P. Conde 《Microfluidics and nanofluidics》2013,15(3):361-376
A surface in contact with an aqueous solution is electrically characterized by the zeta potential. One way of determining indirectly the zeta potential of a surface is by measuring the streaming currents generated by a Poiseuille flow through a capillary channel with charged walls. We report measurements of streaming current in individual rectangular glass/PDMS microchannels with integrated miniaturized electrodes. Experiments performed using solutions with different salt concentrations and different electrode materials showed that the measured electrical current depends on the electrode material and in general differs from the real value of the streaming current. To determine the streaming current from the experimental data, an equivalent circuit model is proposed. The extracted value of the streaming current is proportional to the flow rate of electrolyte and the calculated glass/PDMS zeta potential scales linearly with the logarithm of the salt concentration. This work offers a thorough analysis of the effects that come into play during streaming current measurements and, in particular, it describes potential sources of error that can affect the streaming current measurements and suggestions on how to correct the measured values. 相似文献
109.
María de Lourdes Contreras‐Pacheco Fernando Santacruz‐Ruvalcaba Jorge A. García‐Fajardo José de Jesús Sánchez G. Mario A. Ruíz L. Mirna Estarrón‐Espinosa Arturo Castro‐Castro 《International Journal of Food Science & Technology》2013,48(10):2111-2118
Dioscorea spp. tubers are known commonly as camote de cerro to the state of Jalisco, México. Besides its use as food, it contains diosgenin, a raw material used widely for synthesising steroid hormones. The purpose of the present research was to determine diosgenin contents by gas chromatography‐mass spectrometry (GC‐MS), as well as physical and chemical characteristics of sixty Dioscorea spp. accessions cultivated in mesh shade coming from eleven localities in the state of Jalisco. Extraction protocol for diosgenin was maceration combined with ethanol 80%. Significant statistical differences for diosgenin content were found between accessions, finding levels between 0.02 and 0.16 mg kg?1 in dry basis. Length, weight tuber, proportion pulp/skin, percentage of pulp and percentage of skin showed significant differences. Chemical composition based in fresh weight presented in moisture percentage a range of 71.93–83.26%, crude protein 1.42–1.74%, ashes 0.80–1.16%, lipid 0.13–0.17%, crude fibre 3.80–4.02% and total carbohydrates 13.97–25.44%. Results show that tubers from Jalisco can be an important source of nutrients for consumers. 相似文献
110.
Fermín L. Cruz José A. Troyano Fernando Enríquez F. Javier Ortega Carlos G. Vallejo 《Expert systems with applications》2013,40(8):3174-3184
Nowadays, people do not only navigate the web, but they also contribute contents to the Internet. Among other things, they write their thoughts and opinions in review sites, forums, social networks, blogs and other websites. These opinions constitute a valuable resource for businesses, governments and consumers. In the last years, some researchers have proposed opinion extraction systems, mostly domain-independent ones, to automatically extract structured representations of opinions contained in those texts. In this work, we tackle this task in a domain-oriented approach, defining a set of domain-specific resources which capture valuable knowledge about how people express opinions on a given domain. These resources are automatically induced from a set of annotated documents. Some experiments were carried out on three different domains (user-generated reviews of headphones, hotels and cars), comparing our approach to other state-of-the-art, domain-independent techniques. The results confirm the importance of the domain in order to build accurate opinion extraction systems. Some experiments on the influence of the dataset size and an example of aggregation and visualization of the extracted opinions are also shown. 相似文献