全文获取类型
收费全文 | 6191篇 |
免费 | 449篇 |
国内免费 | 249篇 |
专业分类
电工技术 | 328篇 |
综合类 | 352篇 |
化学工业 | 1090篇 |
金属工艺 | 381篇 |
机械仪表 | 301篇 |
建筑科学 | 468篇 |
矿业工程 | 125篇 |
能源动力 | 230篇 |
轻工业 | 388篇 |
水利工程 | 84篇 |
石油天然气 | 262篇 |
武器工业 | 39篇 |
无线电 | 669篇 |
一般工业技术 | 909篇 |
冶金工业 | 433篇 |
原子能技术 | 76篇 |
自动化技术 | 754篇 |
出版年
2024年 | 22篇 |
2023年 | 91篇 |
2022年 | 144篇 |
2021年 | 224篇 |
2020年 | 184篇 |
2019年 | 170篇 |
2018年 | 144篇 |
2017年 | 170篇 |
2016年 | 168篇 |
2015年 | 169篇 |
2014年 | 252篇 |
2013年 | 349篇 |
2012年 | 314篇 |
2011年 | 396篇 |
2010年 | 321篇 |
2009年 | 306篇 |
2008年 | 338篇 |
2007年 | 316篇 |
2006年 | 346篇 |
2005年 | 309篇 |
2004年 | 207篇 |
2003年 | 212篇 |
2002年 | 171篇 |
2001年 | 169篇 |
2000年 | 138篇 |
1999年 | 188篇 |
1998年 | 180篇 |
1997年 | 134篇 |
1996年 | 138篇 |
1995年 | 115篇 |
1994年 | 92篇 |
1993年 | 83篇 |
1992年 | 51篇 |
1991年 | 52篇 |
1990年 | 37篇 |
1989年 | 36篇 |
1988年 | 29篇 |
1987年 | 21篇 |
1986年 | 24篇 |
1985年 | 9篇 |
1984年 | 6篇 |
1983年 | 9篇 |
1982年 | 7篇 |
1981年 | 7篇 |
1979年 | 6篇 |
1978年 | 4篇 |
1976年 | 7篇 |
1975年 | 7篇 |
1969年 | 2篇 |
1963年 | 2篇 |
排序方式: 共有6889条查询结果,搜索用时 15 毫秒
1.
Xiao-Mei Sha Li-Jun Zhang Wen-Mei Chen Guang-Yao Wang Jin-Lin Li Zi-Zi Hu Zong-Cai Tu 《International Journal of Food Science & Technology》2022,57(3):1573-1586
Thermal action in extraction process had effects on characteristic tryptic peptides identification and gelling properties of porcine gelatin. SDS-PAGE, HPLC-LTQ/Orbitrap high-resolution mass spectrometry, texture analyser and rheometer were used to evaluate collagen depolymerisation degree, characteristic tryptic peptides and gelling properties of gelatins prepared in various thermal actions. Results showed that with increasing temperature and time, depolymerisation degree enlarged, while gel strength, gelling and melting temperature decreased. Mass spectra showed that 47 and 49 common characteristic tryptic peptides were identified in gelatins extracted at 50 °C and 100 °C with various times, respectively. Moreover, 34 common characteristic tryptic peptides were identified in all gelatin samples. Further comparison between this work and our previous investigations yielded 20 common characteristic tryptic peptides, which stably exist in various thermal actions. These common characteristic tryptic peptides may be very helpful for the accurate authentication of porcine gelatin. 相似文献
2.
Quan Nguyen Minh Quoc Dat Lai Hoang Nguy Minh Minh Tu Tran Kieu Ngoc Lam Gia Uyen Le My Phung Hang Hoang Dung Nguyen Tran Diem Ai Chau Ngoc Thuc Trinh Doan 《International Journal of Food Science & Technology》2022,57(7):4507-4517
To prevent the adulteration of agricultural resources and provide a solution to enhance the green coffee bean supply chain, authentication using the near-infrared spectroscopy (NIRS) technique was investigated. Partial least square with discrimination analysis (PLS-DA) models combined with various preprocessing methods were built from NIR spectra of 153 Vietnamese green coffee samples. The model combined with the standard normal variate and the first order of derivative yielded excellent performance in predicting coffee species with the error cross-validation of 0.0261. PLS-DA model of mean centre and first-order derivative spectra also yielded good performance in verifying geographical indication of green coffee with the error of 0.0656. By contrast, the predicting abilities of post-harvest methods were poor. The overall results showed a high potential of the NIRS in online authentication practices. 相似文献
3.
Jieyun Tu Xinghui Shi Yuanrong Jing Huimin Zou Jakub Kadlcak Zhanfu Yong Susu Liu Guangyong Liu 《Polymer Engineering and Science》2021,61(8):2213-2221
Equilibrium swelling and rheological tests were adopted to systematically investigate the effects of softener type and dosage on the crosslink densities. The results turned out that the chemical crosslink density could be distinguished from the physical crosslink density by comparing the results of equilibrium swelling and rheological tests. The liquid butadiene (LB) as a softener leads to the greatest reduction in crosslink density, followed by polyethylene wax (PW) and paraffinic oil (PO). The tensile strength decreases with increasing PO content while shows peak values with increase of LB and PW contents. The dependencies of chemical crosslink density on the aging time under 150°C are quite different for the three softeners, which can be expected from the double crosslinking networks consisting of small softener and large main crosslinking networks. Further investigation has been performed to correlate the tensile strength with chemical crosslink density of ethylene propylene diene monomer elastomer vulcanizates. Three different linear relationships can be obtained for the softeners independent of the aging time. It can now be expected from this study that the role of some new softeners in rubber compounds is not only confined to plasticization but also forms crosslinking networks in the peroxide-cured rubbers. 相似文献
4.
In this study, 30 subjects were exposed to different combinations of air temperature (Ta: 24, 27, and 30°C) and CO2 level (8000, 10 000, and 12 000 ppm) in a high-humidity (RH: 85%) underground climate chamber. Subjective assessments, physiological responses, and cognitive performance were investigated. The results showed that as compared with exposure to Ta = 24°C, exposure to 30°C at all CO2 levels caused subjects to feel uncomfortably warm and experience stronger odor intensity, while increased mental effort and greater intensity of acute health symptoms were reported. However, no significant effects of Ta on task performance or physiological responses were found. This indicated that subjects had to exert more effort to maintain their performance in an uncomfortably warm environment. Increasing CO2 from 8000 to 12 000 ppm at all Ta caused subjects to report higher rates of headache, fatigue, agitation, and feeling depressed, although the results were statistically significant only at 24 and 27°C. The text typing performance and systolic blood pressure (SBP) decreased significantly at this exposure, whereas diastolic blood pressure (DBP) and thermal discomfort increased significantly. These effects suggest higher arousal/stress. No significant interaction effect of Ta and CO2 concentration on human responses was identified. 相似文献
5.
随着我国环境保护法规《大气污染防治法》的修订和《涂料征收消费税通知》的公布,探讨了其对船舶涂料企业的冲击及其应对措施。 相似文献
6.
网络安全事件的关联分析方法的比较研究 总被引:2,自引:0,他引:2
随着当前攻击手段和技术的日益复杂化,一次入侵事件往往需要多个步骤才能完成,这些步骤都是彼此相关的。但是传统的入侵检测集中于检测底层的入侵或异常,所检测到的结果也仅仅是一次完整入侵的一部分,所以不能将不同的报警结合起来以发现入侵的逻辑步骤或者入侵背后的攻击策略。关联分析技术将不同分析器上产生的报警进行融合与关联分析,极大地减少了报警的数量,降低了入侵检测的误报率,并且适当的减少了入侵检测的漏报率。文中在对网络安全事件关联分析方法的系统结构进行分析后,着重介绍了当前比较流行的几种网络安全事件关联分析方法,最后对各种方法进行了比较研究。 相似文献
7.
隔河岩水电站大坝廊道排水控制系统存在设备备品、备件不足,技术落后,系统软件工作不稳定等问题,不能按库坝管理要求对排水量进行监控,严重影响廊道排水系统的可靠性。为此,对该系统进行了综合自动化改造,采用TCP6IP通讯,PLC直接上网,异种CPU热备冗余等技术,提高了整个系统的运行可靠性,满足了“无人值班”的要求。 相似文献
8.
针对大口径螺旋焊管内涂层涂敷作业时,钢管内残留的涂料挥发份如何清除的问题,介绍了一种自行设计制造的内涂层涂敷挥发份吹除装置。 相似文献
9.
10.
M. K. Bakhadyrkhanov O. É. Sattarov Kh. M. Iliev K. S. Ayupov Tuérdi Umaier 《Semiconductors》2005,39(7):789-791
It is experimentally ascertained that light stimulates the negative magnetoresistance observed in a high electric field in silicon doped with boron and manganese. The optimum conditions (the electric field, temperature, illumination, and resistivity of the material) for observation of the largest magnitude of negative magnetoresistance in (Si:B):Mn are determined. The dependence of the negative magnetoresistance on the concentration of compensating impurity is established. 相似文献