全文获取类型
收费全文 | 98篇 |
免费 | 2篇 |
专业分类
化学工业 | 12篇 |
金属工艺 | 1篇 |
建筑科学 | 32篇 |
轻工业 | 8篇 |
无线电 | 1篇 |
一般工业技术 | 3篇 |
冶金工业 | 37篇 |
自动化技术 | 6篇 |
出版年
2022年 | 2篇 |
2021年 | 1篇 |
2020年 | 3篇 |
2019年 | 1篇 |
2017年 | 4篇 |
2016年 | 3篇 |
2013年 | 3篇 |
2012年 | 1篇 |
2011年 | 7篇 |
2010年 | 6篇 |
2009年 | 11篇 |
2008年 | 27篇 |
2007年 | 7篇 |
2006年 | 2篇 |
2005年 | 1篇 |
2004年 | 1篇 |
2003年 | 2篇 |
2002年 | 1篇 |
2001年 | 4篇 |
2000年 | 4篇 |
1997年 | 1篇 |
1993年 | 3篇 |
1989年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1975年 | 1篇 |
排序方式: 共有100条查询结果,搜索用时 15 毫秒
61.
将生活空间装扮得与梦想无限接近是每个人的愿望。2008年.设计师将更加丰富的创意完美演绎,为我们创造出最心仪的美丽场景。 相似文献
62.
Wilfley Denise E.; Agras W. Stewart; Telch Christy F.; Rossiter Elise M.; Schneider John A.; Cole Abby Golomb; Sifford LuAnn; Raeburn Susan D. 《Canadian Metallurgical Quarterly》1993,61(2):296
Evaluated the effectiveness of group cognitive-behavioral treatment (CBT) and group interpersonal psychotherapy (IPT) for binge eating. 56 women with nonpurging bulimia were randomly assigned to 1 of 3 groups: CBT, IPT, or a wait-list control (WLC). Treatment was administered in small groups that met for 16 weekly sessions. At posttreatment, both group CBT and group IPT treatment conditions showed significant improvement in reducing binge eating, whereas the WLC condition did not. Binge eating remained significantly below baseline levels for both treatment conditions at 6-mo and 1-yr follow-ups. These data support the central role of both eating behavior and interpersonal factors in the understanding and treatment of bulimia. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
64.
65.
King Abby C.; Castro Cynthia; Wilcox Sara; Eyler Amy A.; Sallis James F.; Brownson Ross C. 《Canadian Metallurgical Quarterly》2000,19(4):354
Personal, program-based, and environmental barriers to physical activity were explored among a U.S. population-derived sample of 2,912 women 40 years of age and older. Factors significantly associated with inactivity included American Indian ethnicity, older age, less education, lack of energy, lack of hills in one's neighborhood, absence of enjoyable scenery, and infrequent observation of others exercising in one's neighborhood. For all ethnic subgroups, caregiving duties and lacking energy to exercise ranked among the top 4 most frequently reported barriers. Approximately 62% of respondents rated exercise on one's own with instruction as more appealing than undertaking exercise in an instructor-led group, regardless of ethnicity or current physical activity levels. The results underscore the importance of a multifaceted approach to understanding physical activity determinants in this understudied, high-risk population segment. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
66.
Eshet Y Mann RR Anaton A Yacoby T Gefen A Jerby E 《IEEE transactions on bio-medical engineering》2006,53(6):1174-1182
This paper presents a feasibility study of drilling in fresh wet bone tissue in vitro using the microwave drill method [Jerby et al, 2002], toward testing its applicability in orthopaedic surgery. The microwave drill uses a near-field focused energy (typically, power under approximately 200 W at 2.45-GHz frequency) in order to penetrate bone in a drilling speed of approximately 1 mm/s. The effect of microwave drilling on mechanical properties of whole ovine tibial and chicken femoral bones drilled in vitro was studied using three-point-bending strength and fatigue tests. Properties were compared to those of geometrically similar bones that were equivalently drilled using the currently accepted mechanical rotary drilling method. Strength of mid-shaft, elastic moduli, and cycles to failure in fatigue were statistically indistinguishable between specimen groups assigned for microwave and mechanical drilling. Carbonized margins around the microwave-drilled hole were approximately 15% the hole diameter. Optical and scanning electron microscopy studies showed that the microwave drill produces substantially smoother holes in cortical bone than those produced by a mechanical drill. The hot spot produced by the microwave drill has the potential for overcoming two major problems presently associated with mechanical drilling in cortical and trabecular bone during orthopaedic surgeries: formation of debris and rupture of bone vasculature during drilling. 相似文献
67.
Air injection into concentrated maple sap during processing: impact on syrup composition and flavour
Abby K van den Berg Timothy D Perkins Mark L Isselhardt Mary An Godshall Steven W Lloyd 《Journal of the science of food and agriculture》2009,89(10):1770-1774
BACKGROUND: Air injection (AI) is a relatively new process used during maple sap thermal processing to increase the profitability of maple syrup production by increasing the production of more economically valuable light‐coloured syrup. The effects of applying this technology in conjunction with existing practices employed to increase the efficiency of maple production, such as reverse osmosis (RO), are unknown. The main objective of this work was to investigate the effects of AI on syrup chemical composition and flavour when applied to maple sap concentrated by RO. RESULTS: The chemical composition and flavour of syrup produced simultaneously with and without AI from a common source of maple sap concentrated by RO were compared. The chemical composition of maple syrup produced with AI was within ranges previously published for maple syrup. Syrup produced with AI was significantly lighter in colour than syrup produced without AI from the same sap concentrate (P < 0.001). Although syrup produced with AI contained fewer volatile flavour compounds and had a flavour distinguishable from that of syrup produced without AI from the same concentrated sap, the flavour properties of AI syrup were consistent with those of light‐coloured maple syrup. CONCLUSION: The results indicate that AI can be used in conjunction with RO to effectively increase the economic efficiency of maple syrup production without detrimental impacts on maple syrup properties. Copyright © 2009 Society of Chemical Industry 相似文献
68.
Murphy James G.; Barnett Nancy P.; Goldstein Abby L.; Colby Suzanna M. 《Canadian Metallurgical Quarterly》2007,21(2):261
Laboratory research suggests that there is an inverse relationship between substance use and substance-free reinforcement, but the relevance of this relationship to the prevention of human substance abuse remains somewhat unclear. The present study evaluated the relationship between alcohol use and enjoyment from substance-free activities in a sample of college students who had previously completed an alcohol intervention (N = 107; 55% women; 45% men). The authors used a modified 30-day timeline follow-back interview to collect data on enjoyment from specific substance-free activities that occurred in the evening. Regression analyses revealed that there was a negative association between alcohol consumption and substance-free activity enjoyment for women but not for men. Women who reported greater enjoyment on abstinent evenings reported lower past-month alcohol consumption. Greater average enjoyment from substance-free activities was associated with greater motivation to change drinking among men and women. Although further research is required to determine procedures for increasing participation in substance-free activities and to explicate possible gender differences, these results suggest that increasing enjoyable substance-free activities may be an important prevention component. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
69.
70.
The 12-mo effects of exercise training on psychological outcomes in adults (aged 50–65 yrs) were evaluated. Ss (N?=?357) were randomly assigned to assessment-only control or to higher intensity group, higher intensity home, or lower intensity home exercise training. Exercisers showed reductions in perceived stress and anxiety in relation to controls. Reductions in stress were particularly notable in smokers. Regardless of program assignment, greater exercise participation was significantly related to less anxiety and fewer depressive symptoms, independent of changes in fitness or body weight. It is concluded that neither a group format nor vigorous activity was essential in attaining psychological benefits from exercise training in healthy adults. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献