全文获取类型
收费全文 | 64篇 |
免费 | 1篇 |
专业分类
电工技术 | 1篇 |
化学工业 | 16篇 |
机械仪表 | 1篇 |
建筑科学 | 1篇 |
矿业工程 | 2篇 |
能源动力 | 9篇 |
轻工业 | 6篇 |
石油天然气 | 2篇 |
无线电 | 11篇 |
一般工业技术 | 7篇 |
冶金工业 | 4篇 |
原子能技术 | 1篇 |
自动化技术 | 4篇 |
出版年
2022年 | 1篇 |
2021年 | 2篇 |
2019年 | 2篇 |
2018年 | 4篇 |
2015年 | 2篇 |
2014年 | 3篇 |
2013年 | 4篇 |
2012年 | 2篇 |
2011年 | 11篇 |
2010年 | 4篇 |
2009年 | 2篇 |
2008年 | 3篇 |
2007年 | 4篇 |
2005年 | 3篇 |
2004年 | 1篇 |
2003年 | 1篇 |
2002年 | 1篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1998年 | 5篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1991年 | 3篇 |
排序方式: 共有65条查询结果,搜索用时 31 毫秒
1.
本文主要介绍了在三个挖孔桩工程中,用点荷载法检验岩基承载力以控制挖孔深度的情况,结果表明,与勘察报告建议的开挖深度基本一致。 相似文献
2.
Vang ZM 《Urban studies (Edinburgh, Scotland)》2010,47(14):2983-3012
The article examines the role of housing supply in ethnic diversity and the residential segregation of Asian, African and eastern European immigrants from Irish nationals in Ireland. Housing supply is defined as the proportions of new housing, private rental accommodation and social housing among all housing units in an electoral district. Multivariate regressions reveal that, among all three housing supply variables, the proportion of private rentals had the largest effect on ethnic diversity and immigrant— Irish segregation. Areas with higher proportions of private rental units were more ethnically diverse, had greater presences of Africans, Asians and eastern Europeans (as opposed to high concentrations of Irish nationals) and exhibited greater integration between each of the three immigrant groups and Irish nationals. The article concludes with a discussion of immigrant assimilation and questions whether the patterns of residential integration observed would further facilitate other forms of social inclusion for immigrants in Irish society. 相似文献
3.
Jian Wang Tuan Le Vang A. A. Pyrkin S. A. Kolyubin A. A. Bobtsov 《Automation and Remote Control》2018,79(12):2159-2168
We consider the problem of identifying unknown nonstationary piecewise linear parameters for a linear regression model. A new algorithm is proposed that allows, in the case of a number of assumptions on the elements of the regressor, to provide an estimate of unknown non-stationary parameters. We analyze in detail the case with two unknown parameters, which makes it possible to understand the main idea of the proposed approach. We also consider a generalization to the case of an arbitrary number of parameters. We give an example of computer simulation that illustrates the efficiency of the proposed approach. 相似文献
4.
M. Reddy J. M. Peterson T. Vang J. A. Franklin M. F. Vilela K. Olsson E. A. Patten W. A. Radford J. W. Bangs L. Melkonian E. P. G. Smith D. D. Lofgreen S. M. Johnson 《Journal of Electronic Materials》2011,40(8):1706-1716
This paper presents the status of HgCdTe growth on large-area Si and CdZnTe substrates at Raytheon Vision Systems (RVS). The different technological tools that were used to scale up the growth from 4 inch to 6 inch diameter on Si and from 4 cm × 4 cm to 8 cm × 8 cm on CdZnTe without sacrificing the quality of the layers are described. Extremely high compositional uniformity and low macrodefect density were achieved for single- and two-color HgCdTe layers on both Si and CdZnTe substrates. Finally, a few examples of detector and focal-plane array results are included to highlight the importance of high compositional uniformity and uniformly low macrodefect density of the epitaxial layers in obtaining high operability and low cluster outages in single- and two-color focal-plane arrays (FPAs). 相似文献
5.
Engaging High‐Sensation Seekers: The Dynamic Interplay of Sensation Seeking,Message Visual‐Auditory Complexity and Arousing Content 下载免费PDF全文
Zheng Wang Mao Vang Kathryn Lookadoo John M. Tchernev Cody Cooper 《The Journal of communication》2015,65(1):101-124
This study extends the research on message‐sensation value (MSV) by treating it as a dynamic stream of complex visual‐auditory information and arousing content (MSV‐d). Real‐time attentional and emotional responses to this dynamic stream during the PSA viewing process are indicated by psychophysiological measures. Dynamic models are used to systematically examine endogenous and exogenous influences on message processing to more accurately understand the effects of MSV‐d variables and individuals' sensation seeking tendencies during the processing of the PSAs. An important finding is that generally, increasing visual‐auditory complexity activates an approach tendency in those with high sensation‐seeking tendencies but activates an avoidance tendency in those with low sensation‐seeking tendencies, and this response pattern is moderated by arousing content. 相似文献
6.
合成氨生产装置中热钾碱脱碳系统的钢铁腐蚀和防护是关系能否安全稳定运行的关键,只要认真做好制造的热处理,生产前的钝化,生产中的保护就能达到预期目的。 相似文献
7.
Scott D.C. Vang T.A. Elliott J. Forbes D. Lacey J. Everett K. Alvarez F. Johnson R. Krispin A. Brock J. Lembo L. Jiang H. Shin D.S. Zhu J.T. Yu P.K.L. 《Photonics Technology Letters, IEEE》2000,12(4):422-424
The nonlinearities generated by wide-band, high-current photodetectors are discussed in the context of the performance of an externally modulated analog radio-frequency fiber-optic link. The quantitative impart of the detector's third-order intermodulation product intercept (IP3) on the link's spur-free dynamic range is analyzed. Waveguide p-i-n photodiodes were developed to specifically address these stringent IP3 goals. The IP3 was measured using a four laser heterodyne system resulting in an IP3 of 27 dBm measured at a center frequency of 20 GHz with 20 mA of de photocurrent. The authors believe that this is the highest photodetector IP3 reported to date at these operating conditions 相似文献
8.
本文介绍了研制的新型三相脉冲电导式空隙率计.与国外代表性的Merilo旋转电场式空隙率计比较,其传感器结构和激励电源等均有新的创新.研究结果表明:仪表在线性度、测量精度、频率响应以及结构简化等方面,均有提高和改进. 相似文献
9.
Yang H. Nesnidal M. Al-Muhanna A. Mawst L.J. Botez D. Vang T.A. Alvarez F.D. Johnson R. 《Photonics Technology Letters, IEEE》1998,10(8):1079-1081
Simplified antiresonant-reflective-optical-waveguide distributed-feedback semiconductor lasers based on Al-free InGaAs-InGaAsP-InGaP materials are reported for the first time. Devices with 6.5-μm-wide emitting apertures operate single-frequency (λ=0.968 μm) and single-spatial-mode to 157-mW continuous-wave output power. The full-width at half-maximum of the lateral far-field pattern is 4.5°, in excellent agreement with theory. Relative intensity noise values as low as -154 dB/Hz are measured between 500 MHz and 8 GHz 相似文献
10.
The citrus pock caterpillar, Prays endocarpa (Yponomeutidae; Praydinae), is a pest of pomelo (Citrus grandis L.) in Vietnam. Gas chromatography-mass spectrometry analyses of pheromone gland extracts from female moths identified three monoenyl compounds, (Z)-7-tetradecenal (Z7-14:Ald), (Z)-7-tetradecenyl acetate (tentatively identified, Z7-14:OAc), and (Z)-7-tetradecen-1-ol (Z7-14:OH), in a ratio of about 10:3:10. In the field, traps baited with synthetic Z7-14:Ald (0.5 mg) caught male P. endocarpa. The other two compounds, either alone or when added to Z7-14:Ald, did not elicit increases in trap catch (relative to the appropriate treatment). Synthetic Z7-14:Ald was used to monitor and control this species in pomelo orchards in Vinh Long Province. Monitoring revealed that adults were present throughout the year with discernible peaks in December, March, and April. A mass-trapping trial, using 20 traps in a 0.1 ha pomelo orchard, effectively suppressed fruit damage to levels similar to that achieved by an insecticide (Karate 2.5EC). Mating disruption trials, using polyethylene-tube dispensers, each filled with 80 mg of Z7-14:Ald at a rate of 200 or 400 dispensers/ha, also controlled damage by this pest to levels below that achieved by an insecticide treatment. This work demonstrates the potential for pheromone-based control of this pest in Vietnam. 相似文献