全文获取类型
收费全文 | 294篇 |
免费 | 19篇 |
专业分类
电工技术 | 3篇 |
化学工业 | 68篇 |
金属工艺 | 15篇 |
机械仪表 | 12篇 |
建筑科学 | 14篇 |
矿业工程 | 1篇 |
能源动力 | 38篇 |
轻工业 | 21篇 |
水利工程 | 1篇 |
石油天然气 | 2篇 |
无线电 | 26篇 |
一般工业技术 | 69篇 |
冶金工业 | 9篇 |
原子能技术 | 3篇 |
自动化技术 | 31篇 |
出版年
2023年 | 9篇 |
2022年 | 8篇 |
2021年 | 8篇 |
2020年 | 7篇 |
2019年 | 8篇 |
2018年 | 13篇 |
2017年 | 9篇 |
2016年 | 12篇 |
2015年 | 13篇 |
2014年 | 18篇 |
2013年 | 31篇 |
2012年 | 19篇 |
2011年 | 31篇 |
2010年 | 26篇 |
2009年 | 17篇 |
2008年 | 15篇 |
2007年 | 15篇 |
2006年 | 17篇 |
2005年 | 9篇 |
2004年 | 5篇 |
2003年 | 6篇 |
2002年 | 1篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1989年 | 1篇 |
1985年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
排序方式: 共有313条查询结果,搜索用时 15 毫秒
11.
Aysel Buyuksagis Meltem Dİlek 《Protection of Metals and Physical Chemistry of Surfaces》2019,55(6):1182-1194
Protection of Metals and Physical Chemistry of Surfaces - The corrosion inhibition and adsorption characteristics of the extract obtained from the plant Papaver somniferum L. (PSL) by... 相似文献
12.
13.
Ugur Ozveren 《Energy Sources, Part A: Recovery, Utilization, and Environmental Effects》2016,38(19):2906-2913
The lower heating value is an important parameter to conduct the modeling of any fuel processing system. In this study, the relationship between the physical composition of municipal solid waste and its lower heating values was investigated using a Bayesian regularized artificial neural network (ANN) as an artificial intelligence approach. A new nonlinear regression model was also developed in this study. The artificial intelligence approach was compared using the developed and published correlations. The approach offers a high degree of correlation, and as a result, the ANN provides a useful tool for designing any thermolysis process for municipal solid waste. 相似文献
14.
A key issue in crisis communication is the way people process crisis‐relevant information to minimize danger. This paper discusses the impact of previously experienced crises on the public's interpretation of warning messages. People may not have direct experience of a crisis, but they still have acquired mediated experiences of a variety of crises. The present study introduces the term cultural experience of crisis to label the synthesis of mediated crisis experiences, media and fictional narratives, collective memories of societal disasters, conversations, and immediate crisis experiences of witnesses and victims. The proposed model of cultural experience of crisis is elaborated on the basis of a qualitative text analysis derived from four qualitative interviews 16 focus groups interviews carried out in Estonia from 2008 to 2009. 相似文献
15.
16.
Aysel Kantürk Figen Evren Terzi Nural Yilgör Saip Nami Kartal Sabriye Pişkin 《Korean Journal of Chemical Engineering》2013,30(4):878-890
hermal degradation characteristics of Tetra Pak panel boards (TPPB) can be useful to improve usage of such panels as an alternative to wood-based products such as plywood, fiberboard, and particleboard. In the study, samples from the TPBBs manufactured from waste Tetra Pak packages (WTPP) were heated in a nitrogen atmosphere at different heating rates (10, 15 and 20 °C/min) using a thermal analysis system. The Coats-Redfern kinetic model was applied to calculate kinetic parameters. The degradation rate equations were then established. In addition, the kinetic compensation effect (KCE) was used to correlate the pre-exponential factor (k o ) with activation energy (E a ) and the existence of the KCE was accepted. TG-FT/IR analyses were applied to the TPPB degradation and then the FT-IR stack plot was used to analyze gas products (CO2, CH4, HCOOH, and CH3OH). Infrared vibrational frequencies and the micro, crystal structure of the TPPBs were investigated by Fourier transform infrared spectroscopy (FT-IR), Scanning electron microscope (SEM) and X-Ray diffraction analysis (XRD), respectively. 相似文献
17.
Ugur Aydin Fatih Aksoy Samet Tosun Abdul Semih Ozsevik 《Journal of Adhesion Science and Technology》2016,30(18):2024-2031
Adhesion of root canal filling materials to root dentin is important for the long-term success of the treatment. Push-out bond strength test is used to evaluate the adhesion capacity of root canal filling materials to root canal walls. The aim of the present study is to compare the bond strength of root canal filling materials to root dentin after irrigation with EDTA, chitosan and the combination of chitosan and PIPS irridation using push-out bond strength test. Forty-eight extracted teeth were resected until 13-mm long roots were obtained. Root canals were prepared with a size-25 OneShape instrument. Samples were divided into three groups each including 15 roots. Group 1: Canals were rinsed with 0.2% chitosan and subjected to laser irridation with PIPS at the same time. Group 2: Canals were rinsed with 0.2% chitosan. Group 3: Canals were rinsed with EDTA. All canals were filled with .06 tapered gutta-percha and AH-plus sealer. One-mm thick slices were taken from coronal, middle and apical one-thirds of the roots. Push-out bond strength was determined using a Universal Testing Machine. One root from each group was observed under SEM to evaluate the degree of smear removal. Statistical analysis was performed with Kruskall-Wallis test. Results showed that bond strength values were statistically similar in overall evaluation for all groups (p > .05). In segmental evaluation, group 1 revealed the highest bond strength in apical one-third compared to other groups (p < .05). 相似文献
18.
19.
20.
This paper presents the synthesis and characterization of three new Y-based high temperature-superconducting compounds having relatively higher transition temperature T c compared with that of the Y-123, Y-124, and Y-247. The electrical resistivity measurements indicate the onset critical temperatures as high as 98 K. Atomic compositions of these new Y-Ba-Cu-O superconductors are Y2Ba3Cu5.2O x , Y2Ba5Cu9O x , and YBa4Cu5O x . The X-ray analysis has shown that they have a similar crystalline structure as Y-123 phases. 相似文献