全文获取类型
收费全文 | 96篇 |
免费 | 8篇 |
专业分类
化学工业 | 29篇 |
金属工艺 | 5篇 |
机械仪表 | 6篇 |
建筑科学 | 2篇 |
能源动力 | 4篇 |
轻工业 | 4篇 |
水利工程 | 1篇 |
石油天然气 | 4篇 |
无线电 | 5篇 |
一般工业技术 | 22篇 |
冶金工业 | 15篇 |
原子能技术 | 1篇 |
自动化技术 | 6篇 |
出版年
2023年 | 1篇 |
2022年 | 2篇 |
2021年 | 12篇 |
2020年 | 5篇 |
2019年 | 5篇 |
2018年 | 8篇 |
2017年 | 12篇 |
2016年 | 5篇 |
2015年 | 2篇 |
2014年 | 4篇 |
2013年 | 8篇 |
2012年 | 4篇 |
2011年 | 4篇 |
2010年 | 3篇 |
2009年 | 2篇 |
2008年 | 3篇 |
2007年 | 5篇 |
2006年 | 4篇 |
2005年 | 1篇 |
2004年 | 2篇 |
2002年 | 1篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1980年 | 1篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有104条查询结果,搜索用时 15 毫秒
31.
32.
Ajna Tóth Kateryna V. Voitko Olga Bakalinska Gennadiy P. Prykhod’ko Imre Bertóti Amelia Martínez-Alonso Juan M.D. Tascón Vladimir M. Gun’ko Krisztina László 《Carbon》2012,50(2):577-585
The poor compatibility of carbon materials with different dispersion media can be overcome by surface functionalization. In this work, multiwall carbon nanotubes (MWCNTs) were doped by oxygen and nitrogen at low concentrations. Morphological and structural changes caused by chemical treatment were monitored using nitrogen, propane and water vapor adsorption measurements. Pore size distribution (PSD) functions derived from various models are compared. The contribution of slit-shaped pores to the total surface area available for adsorbed molecules is smaller than that of cylindrical pores. Functionalities with heteroatoms (both O and N) enhance water adsorption onto MWCNTs. However, no statistical difference is observed between the water adsorption properties of O- or N-containing MWCNTs. 相似文献
33.
34.
35.
36.
Alexander Zhygotsky Elena Rynda Victor Kochkodan Maksim Zagomy Tatyana Lobunets Ludmila Kuzmenko Andrey Ragulya 《化学与化工:英文版》2013,(10):949-957
Photocatalytic activity of TiO2 nanopowders of anatase modification with various particle sizes and specific surface areas has been studied in the process of photocatalytic decolorization of aqueous solutions of methylene blue and direct blue 2C azodyes. By means of scanning electron microscopy and low-temperature N2 adsorption method, it was found that TiO2 nanopowders have the particles size of 5-120 nm with the specific surface area of 15-120 m2·g^-1. The used TiO2 samples are characterized by mesoporous structures with average pore size of 4.3-14.9 nm. The photocatalytic activity of TiO2 was evaluated via decolorization of azodyes solutions. It was shown that the efficiency of decolorization symbatically changes with the dye adsorption value on TiO2 surface and the degree of decolorization rises when the surface area of TiO2 nanopowders increases. It was found that TiO2 photocatalytic activity essentially depends on adsorption interactions between the dye molecules and catalytic active centers on TiO2 surface, and these interactions, in turn, are greatly affected by pH of the solution. 相似文献
37.
Ostash O. P. Podhurska V. Ya. Vasyliv B. D. Kulak L. D. Kuzmenko M. M. Fisk A. E. 《Materials Science》2020,55(5):648-655
Materials Science - We study the influence of the chemical composition and the conditions of thermomechanical and thermal treatments on the structural strength determined by the characteristics of... 相似文献
38.
Carolyn A. Watters Kateryna V. Keefer Patricia H. Kloosterman Laura J. Summerfeldt James D.A. Parker 《Computers in human behavior》2013
Young’s (1998a) Internet Addiction Test (IAT) is one of the most commonly used measures of problematic Internet use. Although the instrument is being increasingly applied in research with adolescents, its measurement structure has not been systematically evaluated with pre-adult respondents. Because the results of previous factor-analytic studies with adults have been highly inconsistent, the present study applied both the traditional (simple-structure) and novel (bifactor) modeling approaches to derive the most optimal measurement structure of the IAT for adolescents. The results of exploratory and confirmatory analyses in a large Canadian sample of high-school students (N = 1948) converged on a bifactor model with a dominant global IA factor and two distinct sub-dimensions, each associated with a unique gender and problem behaviour profile. The discussion focuses on the implications of this bifactor structure for scale scoring and substantive theory on the nature and sources of individual differences in Internet addiction. 相似文献
39.
Yong Xu Tatsuya Hiramatsu Kateryna Tarasenko Toyoaki Nishida Yoshiyasu Ogasawara Takashi Tajima Makoto Hatakeyama Masashi Okamoto Yukiko I. Nakano 《AI & Society》2007,22(2):185-196
A key issue in social intelligence design is the realization of artifacts that can fluently communicate with people. Thus,
we proposed a two-layered approach to enhance a robot’s capacity of involvement and engagement. The upper layer flexibly controls
social interaction by dynamic Bayesian networks (DBN) representing social interaction patterns. The lower layer improves the
robustness of the system by detecting rhythmic and repetitive gestures. We designed a listener robot that can follow and record
humans’ explanation on how to assemble and/or disassemble a bicycle. The implementation of this system is described by assembling
the key algorithms presented in this paper. 相似文献
40.
Igor Goldfarb Vladimir Gol'dhstein J. Barry Greenberg Grigory Kuzmenko 《Journal of Engineering Mathematics》2002,44(3):229-243
Semenov's classical model of thermal explosion in a combustible gas mixture is modified to include radiative (rather than conductive) heat-loss effects and gas-density changes. A geometrical asymptotic technique (the method of integral manifolds - MIM) is exploited to perform a qualitative analysis of the governing equations. The strength of this method lies in the compact, clear geometrical/analytical rendition and classification of all possible dynamical scenarios, in terms of the physico-chemical parameters of the system. It is found that there are two main dynamical regimes of the system: cooling regimes and fast explosive regimes. Peculiarities of these dynamical regimes are investigated and their dependence on physical system parameters is analyzed. A criterion for the occurrence of thermal explosion is disclosed. An estimate for the maximum mixture temperature is also derived analytically. It is found that, under certain operating conditions, the dynamics are such that the initial explosive stage of the process essentially behaves adiabatically before succumbing to the dominance of the radiative heat loss that brings the system down to the ambient temperature. 相似文献