首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   344篇
  免费   13篇
化学工业   56篇
金属工艺   4篇
机械仪表   5篇
建筑科学   7篇
能源动力   6篇
轻工业   21篇
水利工程   6篇
无线电   12篇
一般工业技术   39篇
冶金工业   144篇
原子能技术   5篇
自动化技术   52篇
  2023年   4篇
  2022年   3篇
  2021年   16篇
  2020年   2篇
  2019年   11篇
  2018年   5篇
  2017年   7篇
  2016年   10篇
  2015年   4篇
  2014年   9篇
  2013年   20篇
  2012年   9篇
  2011年   18篇
  2010年   19篇
  2009年   15篇
  2008年   17篇
  2007年   21篇
  2006年   14篇
  2005年   10篇
  2004年   9篇
  2003年   10篇
  2002年   12篇
  2001年   13篇
  2000年   6篇
  1999年   8篇
  1998年   15篇
  1997年   9篇
  1996年   6篇
  1995年   10篇
  1994年   3篇
  1993年   7篇
  1992年   4篇
  1991年   1篇
  1990年   2篇
  1989年   5篇
  1988年   1篇
  1986年   1篇
  1985年   3篇
  1984年   5篇
  1982年   4篇
  1981年   2篇
  1979年   1篇
  1978年   1篇
  1977年   1篇
  1976年   2篇
  1975年   1篇
  1973年   1篇
排序方式: 共有357条查询结果,搜索用时 578 毫秒
11.
Much of the research on relapse crises in dieting has focused on isolated lapse events and relied heavily on retrospective self-report data. The present study sought to overcome these limitations by using ecological momentary assessment (EMA) techniques to examine situations of dietary temptation and lapse with a sample of obese, formerly sedentary, postmenopausal women (N = 37) during the final week of a weight-loss intervention. Mood was associated with reports of dietary lapse. Abstinence-violation effects were more strongly associated with dietary lapses than temptations. Finally, coping responses distinguished dietary temptations from lapses. Education on the factors associated with relapse crises in dieting may be imperative for weight loss success and maintenance. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
12.
Self-regulation in driving has primarily been studied as a precursor to driving cessation in older people, who minimise driving risk and compensate for physical and cognitive decline by avoiding driving in challenging circumstances, e.g. poor weather conditions, in the dark and at busy times. This research explores whether other demographic groups of drivers adopt self-regulatory behaviours and examines the effects of affective and instrumental attitudes on self-regulation across the lifespan. Quantitative data were collected from 395 drivers. Women were significantly more likely than men to engage in self-regulation, and to be negatively influenced by their emotions (affective attitude). A quadratic effect of age on self-regulation was determined such that younger and older drivers reported higher scores for self-regulation than middle-years’ drivers. However, this effect was affected by experience such that when experience was controlled for, self-regulation increased with age. Nevertheless, anxious driving style and negative affective attitude were independent predictors of self-regulation behaviours. Results suggest that self-regulation behaviours are present across the driving lifespan and may occur as a result of driving anxiety or low confidence rather than as an effect of ageing.  相似文献   
13.
14.
ABSTRACT

This article accounts for how value in design research can be derived from knowledge exchange that occurs through the collaborative discourse of doing design. To demonstrate this point, the article details the arc and impact of a design research collaboration that extended over several years with design practitioners in the field of internet-connected devices. As a result of this ongoing collaborative work, a programmatic set of design ideals and intentions concerning how to construct a more transparent and ethical relationship with technology was shaped. We examine this sustained and transformative collaboration as a series of knowledge exchanges. Within each particular collaborative project, worldviews and knowledge are exchanged among design researchers and practitioners, enabling them to traverse ‘through practices’ of academic and professional design. To unpack these exchanges and how they built and fed into each other, the article examines how collaboration unfolded and produced value on two levels: first on the scale of the academics and practitioners directly involved in a project; and secondly on the scale of the larger international community of design practitioners concerned with Internet-connected devices, with whom we had shared our work.  相似文献   
15.
16.
Nutrient management on US dairy farms must balance an array of priorities, some of which conflict. To illustrate nutrient management challenges and opportunities across the US dairy industry, the USDA Agricultural Research Service Dairy Agroecosystems Working Group (DAWG) modeled 8 confinement and 2 grazing operations in the 7 largest US dairy-producing states using the Integrated Farm System Model (IFSM). Opportunities existed across all of the dairies studied to increase on-farm feed production and lower purchased feed bills, most notably on large dairies (>1,000 cows) with the highest herd densities. Purchased feed accounted for 18 to 44% of large dairies' total operating costs compared with 7 to 14% on small dairies (<300 milk cows) due to lower stocking rates. For dairies with larger land bases, in addition to a reduction in environmental impact, financial incentives exist to promote prudent nutrient management practices by substituting manure nutrients or legume nutrients for purchased fertilizers. Environmental priorities varied regionally and were principally tied to facility management for dry-lot dairies of the semi-arid western United States (ammonia-N emissions), to manure handling and application for humid midwestern and eastern US dairies (nitrate-N leaching and P runoff), and pasture management for dairies with significant grazing components (nitrous oxide emissions). Many of the nutrient management challenges identified by DAWG are beyond slight modifications in management and require coordinated solutions to ensure an environmentally and economically sustainable US dairy industry.  相似文献   
17.
18.
Research indicates that trauma is extremely prevalent among populations seeking community-based services. However, underdiagnosis and nontreatment of trauma-related disorders is widespread. This study explored how one urban community mental health center (CMHC), serving a severely mentally ill (SMI) population, assessed, diagnosed, and treated reported trauma histories. Results indicate that of the 72 consumers in this sample who reported trauma histories (51%), only 2 were diagnosed with posttraumatic stress disorder (PTSD). Instead, those with a reported trauma history were likely to be diagnosed with affective disorders and were almost seven times as likely to be recommended therapy as were those without a trauma history. However, even those recommended therapy were not likely to receive it. Findings indicate significant barriers to PTSD diagnoses and the receipt of therapy services. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
19.
Densely packed dry‐coated microprojections are shown to deliver vaccines to targeted locations within the skin that are rich in immune cells, thus inducing protective immune responses against a lethal virus challenge. Selectively limiting the antigen coating to the tips of the projections, which penetrate the skin, would significantly reduce the amount of vaccine required in immunization. In this paper a simple technique, dip‐coating the microprojections, is introduced to meet this goal. By increasing the coating solution viscosity, an otherwise strong capillary action is mitigated and the desired controlled coating length on projections is achieved. Following application to the skin, most of the coated vaccine material is rapidly released from the projections (82.6% in mass within 2 min) to the target locations within the skin strata and a potent immune response is induced when a conventional influenza vaccine (Fluvax) is tested in a mouse model. The utility of this coating approach to a variety of molecules representative of vaccines (e.g., chicken egg ovalbumin (OVA) protein, DNA, and fluorescent dyes) is demonstrated. These collective attributes, together with the simplicity of the approach, position the dip‐coating method for practical utility in large vaccination campaigns.  相似文献   
20.
It has been suggested that inverting an image will increase drawing accuracy. However, perceptual evidence suggests that inverting an image inhibits processing of spatial information. D. J. Cohen and S. Bennett (1997) theorized that perceptual distortions will lead to drawing errors. In the present experiment, the authors test whether inverting an image improves drawing accuracy, as suggested by art educators, or results in distorted drawings, as predicted by Cohen and Bennett. The present data reveal that inverting an image inhibits the drawing accuracy of spatial relations thus supporting Cohen and Bennett's (1997) theory of drawing accuracy. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号