全文获取类型
收费全文 | 4465篇 |
免费 | 297篇 |
国内免费 | 6篇 |
专业分类
电工技术 | 56篇 |
综合类 | 1篇 |
化学工业 | 1063篇 |
金属工艺 | 107篇 |
机械仪表 | 144篇 |
建筑科学 | 222篇 |
矿业工程 | 8篇 |
能源动力 | 375篇 |
轻工业 | 836篇 |
水利工程 | 26篇 |
石油天然气 | 17篇 |
无线电 | 231篇 |
一般工业技术 | 782篇 |
冶金工业 | 108篇 |
原子能技术 | 66篇 |
自动化技术 | 726篇 |
出版年
2024年 | 24篇 |
2023年 | 69篇 |
2022年 | 140篇 |
2021年 | 218篇 |
2020年 | 182篇 |
2019年 | 169篇 |
2018年 | 271篇 |
2017年 | 240篇 |
2016年 | 282篇 |
2015年 | 158篇 |
2014年 | 233篇 |
2013年 | 538篇 |
2012年 | 281篇 |
2011年 | 342篇 |
2010年 | 296篇 |
2009年 | 308篇 |
2008年 | 225篇 |
2007年 | 232篇 |
2006年 | 115篇 |
2005年 | 83篇 |
2004年 | 66篇 |
2003年 | 55篇 |
2002年 | 54篇 |
2001年 | 18篇 |
2000年 | 19篇 |
1999年 | 25篇 |
1998年 | 27篇 |
1997年 | 12篇 |
1996年 | 20篇 |
1995年 | 6篇 |
1994年 | 4篇 |
1993年 | 5篇 |
1992年 | 5篇 |
1991年 | 6篇 |
1990年 | 4篇 |
1989年 | 4篇 |
1988年 | 4篇 |
1987年 | 4篇 |
1986年 | 4篇 |
1985年 | 2篇 |
1984年 | 6篇 |
1981年 | 2篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1970年 | 1篇 |
1961年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有4768条查询结果,搜索用时 9 毫秒
1.
2.
3.
4.
Anjan Biswas Sonmezoglu Abdullah Ekici Mehmet Alzahrani Abdullah Khamis Belic Milivoj R. 《Journal of Communications Technology and Electronics》2020,65(12):1384-1398
Journal of Communications Technology and Electronics - This paper implements mathematically rigorous extended trial function algorithm to address cubic–quartic optical solitons in... 相似文献
5.
Arif Karademir Cem Aydemir Semiha Yenidogan Emine Arman Kandırmaz Rukiye G. Kıter 《Color research and application》2020,45(6):1170-1178
Alkyd resins are generally used in the production of printing inks. All industries look for alternative raw materials in the production of ink with the growing inclination toward using natural products. Resins forming the vehicle of the ink to be obtained from natural resources will provide benefits for the environment, nature, and living creatures. The aim of the study was to promote the use of natural resin in the ink system. Natural Pinus pinaster resin was added into vegetable and mineral oil-based solvents in pure form with alkyd resin in different amounts and ink varnishes of different combinations were prepared. Then, printing inks were produced from these varnishes in pure and hybrid form. Following the assessment of the rheological properties of the inks prepared, printing tests were conducted to assess the printing quality parameters. Ideal mixing ratios of the natural resins in the ink were determined for printability. The environmental importance and advantages of the use of natural resins were discussed. Recommendations were given in line with the results to encourage widespread use of natural resins in near future. 相似文献
6.
7.
8.
9.
In this study, the relationship between stunning techniques and protein oxidation which are accepted as the main cause of food spoilage was investigated. For this purpose, the antioxidant status, in vivo myofibrillary protein (MP) oxidation and sensitivity, and postmortem oxidation (inducted with hydroxyl radical system) of rainbow trout (Oncorhynchus mykiss) fillets killed by hitting to head (T1), neck crushing (T2), and convulsion (T3) methods, were investigated. Statistically significant differences (p < .05) were found among all parameters examined and it was observed that the most stressing technique was the convulsion method. It was determined that in protein profiles myosin were influenced too much from stunning technique and in actin observed oxidation-induced reductions. Reductions in S-S and S-H were also found to be increased in carbonyl concentrations, but the most effective values in both processes were determined by the convulsive technique. Our results show that short-term stunning techniques (hitting to head, neck crushing) give better meat quality results in terms of O. mykiss welfare and low MP oxidation rates. In general, we can say that T3 group fillets are more sensitive to oxidative damage, while T1 and T2 groups give better results in maintaining meat quality with low MP oxidation rates. 相似文献
10.
In order to observe the transport ability of peritoneum to small molecular substances, peritoneal equilibration test (PET) was performed in 52 CAPD patients. By analysing the relationship between peritoneal transport function and dialysis adequacy, we found the average urea KT/V and Cr were significantly lower in high and low transport groups (n = 6 and n = 2) than in high average and low average groups (n = 35 and n = 9). According to the results of PET, we adjusted the dialysis program of 11 patients and the dialysis adequacy was markedly improved. We concluded that PET was helpful for selecting and adjusting CAPD program, and discussed some questions which should be payed more attention in PET operation. 相似文献