全文获取类型
收费全文 | 157篇 |
免费 | 3篇 |
专业分类
化学工业 | 20篇 |
金属工艺 | 8篇 |
建筑科学 | 14篇 |
能源动力 | 1篇 |
轻工业 | 7篇 |
水利工程 | 2篇 |
石油天然气 | 2篇 |
无线电 | 4篇 |
一般工业技术 | 18篇 |
冶金工业 | 72篇 |
自动化技术 | 12篇 |
出版年
2022年 | 2篇 |
2021年 | 1篇 |
2020年 | 2篇 |
2016年 | 2篇 |
2015年 | 1篇 |
2014年 | 1篇 |
2013年 | 2篇 |
2012年 | 7篇 |
2011年 | 6篇 |
2010年 | 5篇 |
2009年 | 5篇 |
2008年 | 4篇 |
2007年 | 9篇 |
2006年 | 11篇 |
2005年 | 4篇 |
2004年 | 3篇 |
2003年 | 8篇 |
2002年 | 4篇 |
2001年 | 4篇 |
2000年 | 1篇 |
1999年 | 3篇 |
1998年 | 6篇 |
1997年 | 4篇 |
1996年 | 7篇 |
1995年 | 5篇 |
1994年 | 4篇 |
1993年 | 5篇 |
1992年 | 4篇 |
1991年 | 3篇 |
1990年 | 3篇 |
1989年 | 4篇 |
1988年 | 4篇 |
1987年 | 3篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1984年 | 3篇 |
1983年 | 4篇 |
1982年 | 2篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1978年 | 4篇 |
1977年 | 1篇 |
1974年 | 1篇 |
1963年 | 1篇 |
1961年 | 1篇 |
排序方式: 共有160条查询结果,搜索用时 31 毫秒
1.
Beck J. Gayle; Novy Diane M.; Diefenbach Gretchen J.; Stanley Melinda A.; Averill Patricia M.; Swann Alan C. 《Canadian Metallurgical Quarterly》2003,15(2):184
To examine affect and cognition in differentiating anxiety and depression, 83 older participants with generalized anxiety disorder completed the Cognitive Checklist (CCL) and the Positive and Negative Affect Schedule (PANAS). A 3-factor solution was found for the PANAS: positive affect (PA), anxiety and anger (Negative Affect 1 [NA-1]), and guilt and shame (Negative Affect 2 [NA-2]). A 2-factor structure was noted for the CCL. Correlations with anxiety and depression measures suggested that the CCL Depression (CCL-D) subscale showed stronger correlations with depression, whereas the CCL Anxiety subscale did not uniquely correlate with anxiety. The NA-1 subscale correlated positively with measures of depression and anxiety, whereas the PA subscale showed negative correlations. Hierarchical regression suggested that the CCL-D subscale was a significant predictor of self-reported depression. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
2.
Influence of the character of NOM on the ozonation of MIB and geosmin 总被引:10,自引:0,他引:10
Tastes and odours (T&Os) are a major concern in drinking water as they are not efficiently removed by conventional water treatment. Ozonation has been effective for their destruction in some studies. However, the natural organic matter (NOM) in waters can affect the ozonation process and subsequently affect the destruction of T&Os. Five NOM fractions were isolated and ozonated in synthetic waters. The fraction containing the more highly coloured, higher molecular weight compounds exhibited the highest ozone (O3) demand, whereas the low aromatic fraction exhibited the lowest O3 demand. The character of the NOM fractions influenced the ozonation of MIB and geosmin. The destruction of MIB and geosmin was significantly higher in the fraction with the highest colour and UV/visible absorbance at all O3 doses. The destruction of the compounds in the other fractions showed the same trends, increasing MIB and geosmin destruction with increasing UV/visible absorbing character of the NOM. MIB was also ozonated in two real waters. with results showing a competing effect between NOM concentration and NOM character. The O3 reaction time was shown to be important for the destruction of both compounds. 相似文献
3.
Measurements of dynamic viscoelastic in-plane shear modulus have been made for unidirectional carbon fiber composites with amorphous engineering thermoplastics as the binder resins. The viscoelastic response is modeled by a three-phase, finite-element model in which fiber placement in the plane perpendicular to the fiber axes is largely disordered. In the model, fibers tend to chain with the distance of closest approach dictated by several factors, including the tendency for the resin to wet the entire fiber surface. Polished section microscopy supports the assumed microstructure. The model includes an adsorbed primer layer at the fiber interface with perturbed viscoelastic response. The model is useful throughout the temperature range up to and including the glass transition of the binder resin. 相似文献
4.
5.
Vasquez Melba J. T.; Lott Bernice; García-Vázquez Enedina; Grant Sheila K.; Iwamasa Gayle Y.; Molina Ludwin E.; Ragsdale Brian L.; Vestal-Dowdy Elise 《Canadian Metallurgical Quarterly》2006,61(2):157
In this article, six faculty and students of color who participated in a panel discussion at a symposium during the National Multicultural Conference and Summit of 2003 talk about the barriers they encountered and continue to encounter in their graduate training and places of employment. They also discuss strategies they found to be effective, enhancing, and positive and suggest other possibilities. The contributors describe their relationships with dominant-group and minority peers and talk about how issues of social class, disability, and sexual orientation as well as color have been part of their experience. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
6.
Photographic forensic evidence for the global collapse of the World Trade Center (WTC) towers was developed as part of the
National Institute of Standards and Technology (NIST) WTC collapse investigation. The libraries accumulated during the Federal
Emergency Management Agency/American Society of Civil Engineers study and NIST investigations were searched for images that
showed gross building distortions preceding or during the collapse events. Frames or images showing draw-in of the cast face
of WTC 2 and the south face of WTC 1 were analyzed to map the distortion field, which was tracked over time. The inward distortions
increased in magnitude as the building burned, reaching a maximum at the time of collapse. Evidence of dropped floors within
the towers before global collapse was developed, as was evidence of the kinking and rotation of the top portion of WTC 2 just
before and during collapse. 相似文献
7.
8.
9.
10.
Buunk Bram P.; Collins Rebecca L.; Taylor Shelley E.; VanYperen Nico W.; Dakof Gayle A. 《Canadian Metallurgical Quarterly》1990,59(6):1238
Research on social comparison processes has assumed that a comparison in a given direction (upward or downward) will lead to a particular affective reaction. In contrast, the present 2 studies proposed and found that a comparison can produce either positive or negative feelings about oneself, independent of its direction. Several factors moderated the tendency to derive positive or negative affect from upward and downward comparisons. In Study 1, cancer patients low in self-esteem and with low perceived control over their symptoms and illness were more likely to see downward comparisons as having negative implications for themselves. Those low in self-esteem were also more likely to perceive upward comparisons as negative. In Study 2, individuals with high marital dissatisfaction and those who felt uncertain about their marital relationship were more likely to experience negative affect from upward and downward comparisons. The implications of these findings for social comparison theory and for the coping and adaptation literature are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献