全文获取类型
收费全文 | 2656篇 |
免费 | 91篇 |
国内免费 | 17篇 |
专业分类
电工技术 | 131篇 |
综合类 | 3篇 |
化学工业 | 340篇 |
金属工艺 | 64篇 |
机械仪表 | 50篇 |
建筑科学 | 147篇 |
矿业工程 | 10篇 |
能源动力 | 86篇 |
轻工业 | 255篇 |
水利工程 | 18篇 |
石油天然气 | 13篇 |
武器工业 | 1篇 |
无线电 | 302篇 |
一般工业技术 | 321篇 |
冶金工业 | 297篇 |
原子能技术 | 17篇 |
自动化技术 | 709篇 |
出版年
2023年 | 12篇 |
2022年 | 28篇 |
2021年 | 43篇 |
2020年 | 24篇 |
2019年 | 43篇 |
2018年 | 85篇 |
2017年 | 59篇 |
2016年 | 52篇 |
2015年 | 46篇 |
2014年 | 90篇 |
2013年 | 197篇 |
2012年 | 171篇 |
2011年 | 136篇 |
2010年 | 172篇 |
2009年 | 180篇 |
2008年 | 208篇 |
2007年 | 130篇 |
2006年 | 157篇 |
2005年 | 140篇 |
2004年 | 73篇 |
2003年 | 97篇 |
2002年 | 83篇 |
2001年 | 42篇 |
2000年 | 51篇 |
1999年 | 54篇 |
1998年 | 34篇 |
1997年 | 34篇 |
1996年 | 30篇 |
1995年 | 31篇 |
1994年 | 21篇 |
1993年 | 23篇 |
1992年 | 24篇 |
1991年 | 17篇 |
1990年 | 19篇 |
1989年 | 20篇 |
1988年 | 13篇 |
1987年 | 10篇 |
1986年 | 16篇 |
1985年 | 10篇 |
1984年 | 13篇 |
1983年 | 15篇 |
1982年 | 8篇 |
1981年 | 12篇 |
1980年 | 10篇 |
1979年 | 6篇 |
1978年 | 5篇 |
1977年 | 4篇 |
1976年 | 6篇 |
1975年 | 3篇 |
1974年 | 3篇 |
排序方式: 共有2764条查询结果,搜索用时 15 毫秒
61.
62.
This paper describes our work exploring the suitability of formal specification methods for independent verification and validation (IV&V) of software specifications for large, safety-critical systems. An IV&V contractor often has to perform rapid analysis on incomplete specifications, with no control over how those specifications are represented. Lightweight formal methods show significant promise in this context, as they offer a way of uncovering major errors without the burden of full proofs of correctness. We describe a case study of the use of partial formal models for IV&V of the requirements for Fault Detection Isolation and Recovery on the space station. We conclude that the insights gained from formalizing a specification are valuable, and it is the process of formalization, rather than the end product, that is important. It was only necessary to build enough of the formal model to test the properties in which we were interested. Maintenance of fidelity between multiple representations of the same requirements (as they evolve) is still a problem, and deserves further study. 相似文献
63.
Shahram Izadi Mike Fraser Steve Benford Martin Flintham Chris Greenhalgh Tom Rodden Holger Schnädelbach 《Personal and Ubiquitous Computing》2002,6(4):290-298
The Citywide project is exploring ways in which technology can provide people with rich and engaging digital experiences
as they move through physical space, including historical experiences, performances and games. This paper describes some initial
results and experiences with this project based upon two prototype demonstrators. In the first, we describe an application
in which a search party explores an archaeological site, uncovering enacted scenes within the virtual world that are of a
historical relevance to their particular physical location. In the second, we describe a museum experience where participants
explore an outdoors location, hunting for buried virtual artifacts that they then bring back to a museum for a more detailed
study. Our demonstrators employ a varied set of devices, including mobile wireless interfaces for locating hotspots of virtual
activity when outdoors, to give different experiences of the virtual world depending upon location, task, available equipment
and accuracy of tracking. We conclude by discussing some of the potential advantages of using an underlying shared virtual
world to support interactive experiences across extended physical settings. 相似文献
64.
Ming Miao Huan Jiang Bo Jiang Yungao Li Steve W. Cui Zhengyu Jin 《Journal of Functional Foods》2013,5(4):2024-2029
The relationship between structure and activity of theaflavins against human pancreatic α-Amylase was investigated by in vitro and in silico methods. The IC50 and total energy value showed that inhibitory effects followed the order: theaflavin-3, 3’-di-O-gallate > theaflavin-3’-O-gallate > theaflavin-3-O-gallate > theaflavin. Inhibitory activity was depended on hydroxyl groups and galloyl moieties of theaflavins to interact with the catalytic residues of the active site of α-Amylase by hydrogen bonds and π–π (aromatic–aromatic) interactions. The galloylated theaflavin has higher binding affinity with α-Amylase than non-galloylated theaflavin. The study showed that theaflavins might act as natural enzyme inhibitors with potential health benefits, which provide a foundation for designing novel functional food for effective controlling of starch digestion and postprandial glucose levels. 相似文献
65.
The presence of undeclared cashew can pose a health risk to cashew-allergic consumers. The food industry has the responsibility to declare the presence of cashews on packaged foods even when trace residues are or might be present. The objective of this study was to develop a rapid, sensitive, and specific enzyme-linked immunosorbent assay (ELISA) for the detection of cashew residues. Raw and roasted cashews were defatted and used separately to immunize sheep, goats, and rabbits. The cashew ELISA was developed using sheep and rabbit polyclonal anti-roasted cashew sera as capture and detector reagents, respectively, with visualization through an alkaline phosphatase-mediated substrate reaction. The cashew ELISA was shown to have a limit of quantification of 1 ppm (1 μg cashew/g). The ELISA was highly specific except that substantial cross-reactivity was noted with pistachio and a lesser degree of cross-reactivity was noted with hazelnut. The performance of the ELISA was assessed by manufacturing cookies, ice cream, and milk chocolate with added known amounts (0 to 1000 ppm) of cashew. The mean percent recoveries for ice cream, cookies, and milk chocolate were 118%± 2.9%, 84.3%± 4.0%, and 104%± 3.0%, respectively. In a limited retail survey, 4/5 retail samples with cashew declared on ingredient labels tested positive for cashew compared to 5/36 samples of foods with precautionary labels indicating the possible presence of one or more tree nuts and 0/18 samples without cashew declared on the label in any manner. The cashew ELISA can be used to detect undeclared cashew residue in foods and as a potential tool for the food industry to assess the effectiveness of allergen control strategies and to guarantee compliance with food labeling regulatory requirements. 相似文献
66.
Qafoku NP Ainsworth CC Szecsody JE Qafoku OS Heald SM 《Environmental science & technology》2003,37(16):3640-3646
Aluminum-rich, hyperalkaline (pH > 13.5) and saline high-level nuclear waste (HLW) fluids at elevated temperatures (>50 degrees C), that possibly contained as much as 0.41 mol L(-1) Cr(VI), accidentally leaked to the sediments at the Hanford Site, WA. These extreme conditions promote base-induced dissolution of soil minerals which may affect Cr(VI)aq mobility. Our objective was to investigate Cr(VI)aq transport in sediments leached with HLW simulants at 50 degrees C, under CO2 and O2 free conditions. Results demonstrated that Cr(VI)aq fate was closely related to dissolution, and Cr(VI)aq mass loss was negligible in the first pore volumes but increased significantly thereafter. Similar to dissolution, Cr(VI)aq attenuation increased with increasing fluid residence time and NaOH concentration but decreased with Al concentrations in the leaching solutions. Aqueous Cr(VI) removal rate half-lives varied from 1.2 to 230 h with the fastest at the highest base concentration, lowest Al concentration, greatest reaction time, and lowest Cr(VI) concentration in the leaching solution. The rate of Cr(VI) removal (normalized to 1 kg of solution) varied from 0.83 x 10(-9) (+/-0.44 x 10(-9)) to 9.16 x 10(-9) (+/-1.10 x 10(-9)) mol s(-1). The predominant mechanism responsible for removing Cr(VI) from the aqueous phase appears to be homogeneous Cr(VI) reduction to Cr(III) by Fe(II) released during mineral dissolution. Cr(VI)aq removal was time-limited probably because it was controlled by the rate of Fe(II) release into the soil solution upon mineral dissolution, which was also a time-limited process, and other processes that may act to lower Fe(II)aq activity. 相似文献
67.
SteveCorrigan 《今日电子》2004,(8):66-70
CAN总线(控制器局域网)是适用于多数以CAN与ISO 11898作为物理层的理想的高级工业协议。其成本、性能及可升级性都为系统设计提供了极大的灵活性;LIN总线(局域互联网络)是一种低成本的新型串行通信系统,适用于汽车中的分布式电子控制系统,完善了现有的各种汽车多路网络。从本期开始,我们将精选部分有关CAN/LIN的技术文章,连续刊登在“CAN/LIN专栏”中,供广大读者参考。 相似文献
68.
69.
Study of the impact of a new hurdle technology composed of electro‐activated solution and low heat treatment on the canned pea and corn quality and microbial safety 下载免费PDF全文
Viacheslav Liato Steve Labrie Marzouk Benali Mohammed Aïder 《International Journal of Food Science & Technology》2016,51(1):180-193
The objective of this work was to evaluate the quality of sterilised canned pea and corn in electro‐activated brine solutions at moderate temperatures. The lowest change in vitamin C was associated with the lowest heat treatment, while the short treatment time resulted in significant changes in texture and colour of vegetables. Best texture profile was obtained with the acid electro‐activated brine solution for pea and corn. The neutral electro‐activated brine solution resulted in a less firm texture for pea and corn. The green colour and brightness of canned pea were higher when neutral solution was used (a* = ?8.4 ± 0.3) than for the acidic one (a* = ?3.7 ± 0.6). The yellowness of corn was better with the neutral electro‐activated brine solution (b* = 36.32 ± 1.24) than with the acidic one (b* = 28.44 ± 2.39). Thirty‐three percent decrease of energy consumption was obtained using the electro‐activation technology. 相似文献
70.