全文获取类型
收费全文 | 270篇 |
免费 | 30篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 3篇 |
化学工业 | 64篇 |
金属工艺 | 12篇 |
机械仪表 | 18篇 |
建筑科学 | 8篇 |
矿业工程 | 1篇 |
能源动力 | 8篇 |
轻工业 | 25篇 |
水利工程 | 4篇 |
石油天然气 | 1篇 |
无线电 | 14篇 |
一般工业技术 | 37篇 |
冶金工业 | 32篇 |
自动化技术 | 75篇 |
出版年
2024年 | 1篇 |
2023年 | 6篇 |
2022年 | 3篇 |
2021年 | 10篇 |
2020年 | 11篇 |
2019年 | 14篇 |
2018年 | 21篇 |
2017年 | 16篇 |
2016年 | 30篇 |
2015年 | 4篇 |
2014年 | 6篇 |
2013年 | 28篇 |
2012年 | 29篇 |
2011年 | 18篇 |
2010年 | 13篇 |
2009年 | 20篇 |
2008年 | 11篇 |
2007年 | 8篇 |
2006年 | 4篇 |
2005年 | 10篇 |
2004年 | 5篇 |
2003年 | 2篇 |
2002年 | 4篇 |
2001年 | 3篇 |
2000年 | 1篇 |
1999年 | 3篇 |
1998年 | 7篇 |
1997年 | 3篇 |
1996年 | 3篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1991年 | 1篇 |
1984年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有302条查询结果,搜索用时 15 毫秒
71.
72.
Manuel Cuevas Sebastián Sánchez Vicente Bravo Nicolás Cruz Juan F. García 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2009,84(3):461-467
BACKGROUND: Olive stones were pretreated with liquid hot water (LHW or autohydrolysis) at maximum temperatures between 175 and 225 °C (severity factors, logR0, between 2.73 and 4.39) to be subjected (both liquid and solid components) afterwards to enzymatic hydrolysis with cellulases from Trichoderma viride. Ethanol fermentation of hydrolysates was performed with the non‐traditional yeast Pachysolen tannophilus ATCC 32691. RESULTS: After the enzymatic step, yields of hemicellulose solubilization reached 100%, while the cellulose was only partially hydrolysed (23%, logR0 = 4.39). The maximum yields in total reducing sugars and acetic acid, at the upper end of the severity range, was close to 0.25 and 0.04 g g?1 dry stone, respectively. During the fermentation stage, the increase in R0 reduced the maximum specific growth rate, biomass productivity, and overall biomass yield. The overall yields of ethanol and xylitol ranged, respectively, from 0.18 to 0.25 g g?1 and from 0.01 to 0.13 g g?1. CONCLUSIONS: The results demonstrate the possibility of producing ethanol from olive stones, making use of the cellulose and hemicellulose fraction of the waste. It was confirmed that the overall yield in xylitol strongly depended on severity factor, while the overall yield in ethanol remained practically constant for all the pretreatment conditions tested. Copyright © 2008 Society of Chemical Industry 相似文献
73.
Sebastià Puig Marta Coma Mark CM van Loosdrecht Jesús Colprim Maria D Balaguer 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2007,82(10):898-904
BACKGROUND: When organic matter is limiting for biological nutrient removal (BNR) from wastewater, external organic carbon can be added to a wastewater treatment plant (WWTP). This increases the overall treatment cost, so the choice of substrate is critical. The effect of using ethanol as the carbon source for BNR is investigated. RESULTS: The results clearly showed that using ethanol as a carbon source is a promising strategy for removing nutrients from wastewater. Effluent concentrations of 3.0 mg total nitrogen (TN) L?1 (96% N removal efficiency) and 0.05 mg phosphate (P‐PO4) L?1 (99.9% P removal efficiency) were obtained. Furthermore, tests performed in order to identify the carbon source used by polyphosphate‐accumulating organisms (PAOs) showed that the phosphorus release/carbon uptake ratio using ethanol (0.41 mmol P mmol?1 C) was slightly lower than that with acetate (0.50 mmol P mmol?1 C) but close to that with propionate (0.42 mmol P mmol?1 C). CONCLUSION: Therefore, taking into account the results presented for ethanol‐acclimatised biomass and the fact that the cost of ethanol is lower than that of acetate or propionate, ethanol can be considered as an alternative carbon source if one is needed in a WWTP. Copyright © 2007 Society of Chemical Industry 相似文献
74.
Santiago Pindado Enrique Vega Alejandro Martínez Encarnación Meseguer Sebastián Franchini Imanol Pérez Sarasola 《风能》2011,14(1):119-132
The calibration coefficients of several models of cup and propeller anemometers were analysed. The analysis was based on a series of laboratory calibrations between January 2003 and August 2007. Mean and standard deviation values of calibration coefficients from the anemometers studied were included. Two calibration procedures were used and compared. In the first, recommended by the Measuring Network of Wind Energy Institutes (MEASNET), 13 measurement points were taken over a wind speed range of 4 to 16 m s?1. In the second procedure, 9 measurement points were taken over a wider speed range of 4 to 23 m s?1. Results indicated no significant differences between the two calibration procedures applied to the same anemometer in terms of measured wind speed and wind turbines' Annual Energy Production (AEP). The influence of the cup anemometers' design on the calibration coefficients was also analysed. The results revealed that the slope of the calibration curve, if based on the rotation frequency and not the anemometer's output frequency, seemed to depend on the cup center rotation radius. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
75.
San Juan Sebastián Pablo Virtanen Tuomas Garcia-Molla Victor M. Vidal Antonio M. 《The Journal of supercomputing》2019,75(3):1298-1309
The Journal of Supercomputing - This paper presents an analysis of an efficient parallel implementation of the active-set Newton algorithm (ASNA), which is used to estimate the nonnegative weights... 相似文献
76.
Dorothee Krafft Sebastián López Castellanos Dr. Rafael B. Lira Dr. Rumiana Dimova Dr. Ivan Ivanov Prof. Kai Sundmacher 《Chembiochem : a European journal of chemical biology》2019,20(20):2604-2608
Liposomes are used in synthetic biology as cell-like compartments and their microfluidic production through double emulsions allows for efficient encapsulation of various components. However, residual oil in the membrane remains a critical bottleneck for creating pristine phospholipid bilayers. It has been discovered that osmotically driven shrinking leads to detachment of the oil drop. Separation inside a microfluidic chip has been realized to automate the procedure, which allows for controlled continuous production of monodisperse liposomes. 相似文献
77.
Deepika Chaturvedi Soni Mishra Poonam Tandon José A. Portilla-Arias Sebastián Muñoz-Guerra 《Polymer》2012,53(13):2681-2690
Poly (β-L-malic acid) (PMLA) is a biodegradable polymer and it has various important applications in the biomedical field. In the present work the structural and spectral characteristics of PMLA have been studied by methods of infrared, Raman spectroscopy and quantum chemistry. Electrostatic potential surface, optimized geometry, harmonic vibrational frequencies, infrared intensities and activities of Raman scattering were calculated by density functional theory (DFT) using oligomeric approach employing B3LYP with complete relaxation in the potential energy surface using 6-311++G (d, p) basis set. Based on results, we have discussed the correlation between the vibrational modes and the structure of the PMLA. A complete analysis of the experimental infrared and Raman spectra has been reported on the basis of wavenumber of the vibrational bands and potential energy distribution. The calculated HOMO and LUMO energies shows that charge transfer occur within the molecule. The calculated infrared and the Raman spectra of the polymer based on DFT calculations show reasonable agreement with the experimental results. 相似文献
78.
Alfredo Sanz-Lobera Miguel A. Sebastián Jesus M. Pérez 《The International Journal of Advanced Manufacturing Technology》2010,51(5-8):421-430
At first sight, the establishment of cost–tolerance relations for manufacturing processes may seem to be a fully developed topic. Nevertheless, many real cases in industry have made it clear that a solution that satisfies the practical requirements in this field has not yet been reached. The applicability of the developments of this topic depends greatly on the validity of the cost–tolerance relation values of each specification in a mechanical part, which is subject to tolerances. Nevertheless, none of the studies carried out thus far that consider suppositions of former developments to be valid have made a careful study of this relation. The current study puts forth a new method for establishing the cost–tolerance relation of a manufacturing process based on the variability of the equipment involved in the process. In other words, the proposed method is based on the ability of a specific process to achieve performance within the assigned tolerances at the materialised magnitude. It makes it possible to obtain practical results directly linked to the production process at every time. Furthermore, this method is a key for future developments related to tolerance synthesis or analysis. 相似文献
79.
F. Javier Ramírez Rosario Domingo Miguel A. Sebastián Michael S. Packianather 《Journal of Intelligent Manufacturing》2013,24(3):457-472
This paper presents a Computer-aided System known as the deep-drawing tool applied to the resolution of a combined deep-drawing and ironing process. The system allows the user for selecting input data for getting the formability of material to deep-drawing, selecting the process that provides the best solution from a technological perspective, optimizing the process for material waste, knowing the influence of the punch in the results and considering the process cost. In this manner, the tool allows developing competencies to students that apply scientific, technological, mathematical, economical and sustainable knowledge, with a global vision of the manufacturing processes and conciliating research and teaching. An industrial case has been considered and the proposed Computer-aided System has been tested with a brass alloy to demonstrate the system’s capability. The results obtained show significant improvements in the two variables analyzed, namely, total process time and total manufacturing cost. These aspects provide competencies to students in the manufacturing environment. 相似文献
80.
The effects of shielding gas and post weld heat treatment on the pitting resistance, stress corrosion cracking and hydrogen embrittlement of supermartensitic stainless steel deposits were studied. Two all-weld-metal test coupons were prepared using a metal-cored wire under Ar+5% He and Ar+18%CO2 gas shielding mixtures. Solubilizing and solubilizing plus double tempering heat treatments were done with the objective of achieving different microstructural results. The samples welded under Ar+5% He showed higher pitting corrosion resistance, for all post weld heat treatments, than those welded under Ar+18%CO2. The different post weld heat treatments generated higher susceptibility to this corrosion mechanism. None of the samples presented signs of stress corrosion cracking, but in those subjected to the heat treatment, grain boundary selective attack was observed, on the surfaces of all the samples studied. The samples with highest hardness were more susceptible to hydrogen damage, thereby leading to reduced tensile strength on this condition. 相似文献