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   751篇
  免费   43篇
  国内免费   2篇
电工技术   3篇
综合类   2篇
化学工业   192篇
金属工艺   11篇
机械仪表   7篇
建筑科学   54篇
矿业工程   2篇
能源动力   34篇
轻工业   113篇
水利工程   3篇
石油天然气   3篇
无线电   60篇
一般工业技术   121篇
冶金工业   83篇
原子能技术   2篇
自动化技术   106篇
  2024年   2篇
  2023年   9篇
  2022年   29篇
  2021年   26篇
  2020年   15篇
  2019年   11篇
  2018年   27篇
  2017年   24篇
  2016年   20篇
  2015年   22篇
  2014年   31篇
  2013年   61篇
  2012年   41篇
  2011年   61篇
  2010年   48篇
  2009年   39篇
  2008年   43篇
  2007年   53篇
  2006年   41篇
  2005年   19篇
  2004年   32篇
  2003年   17篇
  2002年   24篇
  2001年   13篇
  2000年   5篇
  1999年   10篇
  1998年   3篇
  1997年   8篇
  1996年   3篇
  1995年   3篇
  1994年   8篇
  1993年   5篇
  1992年   4篇
  1991年   3篇
  1990年   4篇
  1989年   3篇
  1988年   4篇
  1987年   4篇
  1986年   2篇
  1985年   2篇
  1984年   2篇
  1982年   2篇
  1980年   1篇
  1977年   1篇
  1976年   4篇
  1975年   1篇
  1973年   1篇
  1972年   2篇
  1969年   1篇
  1968年   1篇
排序方式: 共有796条查询结果,搜索用时 15 毫秒
1.
Longitudinal analyses on normal versus impaired functioning across 7 domains were conducted in children who had experienced profound institutional deprivation up to the age of 42 months and were adopted from Romania into U.K. families. Comparisons were made with noninstitutionalized children adopted from Romania and with nondeprived within-U.K. adoptees placed before the age of 6 months. Specifically, the validity of the assessment, the degree of continuity and change in levels of functioning from 6 to 11 years, and the factors in the pre- and postadoption environment accounting for heterogeneity in outcome were examined. Pervasive impairment was significantly raised in children experiencing institutional deprivation for ≥6 months of life, with a minority within this group showing no impairment. There was no additional significant effect of duration of deprivation beyond the 6-month cutoff, and few other predictors explained outcome. The pattern of normality/impairment was mainly established by 6 years of age, with considerable continuity at the individual level between 6 and 11 years. The findings are discussed in terms of the possibility of a sensitive period for development. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
2.
3.
美国大学教学评估及其对中国高等教育的启示   总被引:4,自引:0,他引:4  
美国大学和学院,学生对教师教学进行有效性评估。不同大学对教学有不同要求和标准;美国学术界对教学评估体系利与弊展开过辩论,而学生和老师的背景特征可能引起偏见。美国学生对老师进行教学评估的体系,对中国高等教育教学可能有一定的他石意义,但是,评估体系的现实条件有差异,中国不应当照抄或照搬美国教学评估,尤其应该摒弃将教与学关系扭曲为买方和卖方关系的观念。取其精华而弃其糟粕,建立适应中国的教学评估体系才能提高高等教育质量。  相似文献   
4.
ABSTRACT

Many designers and User Interface (UI) educators discuss principles to be followed when designing the functional aspects of a UI. However, many UI principles have been proposed, scattered in scientific papers and teaching books. Some principles are different, and many are somehow similar or overlapping with others. This makes it very difficult to comprehend where to pay attention to when designing a UI. In this paper, we perform a systematic literature review to first identify the most relevant authors in the domain of functional UI design principles. Focusing on the three most cited works of these authors, we extracted 257 principles. We next analyzed all these principles, unified their variants, and, considering their scientific influence, finally derived a shorter and core selection of 36 principles. This core selection provides educators and UI designers with a clear path to teach, evaluate, learn and improve the UI functional design.  相似文献   
5.
Sputter-deposited, equiatomic PtMn thin films have application in giant magnetoresistive spin valves, tunneling magnetoresistive spin valves, and magnetic random access memory. However, the as-deposited films are found to be a disordered A1 phase in a paramagnetic state rather than an antiferromagnetic phase with L10 structure, which is needed for device operation. Therefore, a postannealing step is required to induce the phase transformation from the asdeposited A1 face-centered-cubic phase to the antiferromagnetic L10 phase. The A1 to L10 metastable transformation was studied by x-ray diffraction and differential-scanning calorimetry. An exothermic transformation enthalpy of −12.1 kJ/mol of atoms was determined. The transformation kinetics were simulated using the Johnson-Mehl-Avrami analysis.  相似文献   
6.
7.
8.
The concentrations of polycyclic aromatic hydrocarbons (PAHS) in water and sediments of seven wet detention ponds receiving urban stormwater were investigated. The ponds comprised traditional wet detention ponds with a permanent wet volume and a storage volume as well as ponds that were expanded with sand filters and other means to improve the removal of micropollutants. The concentrations of sigmaPAH in the sediments varied between 6 +/- 5 and 2,222 +/- 603 ng g(-1) dry weight (mean +/- standard deviation), and were highest in the ponds with lower pond volume per catchment area and did not clearly reflect different activities in the catchments. In general, the concentrations of PAHS in the sediments decreased from inlet to outlet, especially in the systems with good conditions for sedimentation such as systems with flow perpendicular sand dikes and extensive submerged vegetation. High molecular weight PAHs were predominant in the sediments indicating the pyrogenic origin of the PAHS. There was no correlation between PAH species concentrations in water or sediments and their hydrophobicity (log K(ow)). PAH concentrations in water fluctuated in response to intensity and frequency of rain events, whereas concentrations in the sediments integrated the pollutant load over time. Pond systems expanded with sand filters and other technologies to enhance removal of micropollutants consistently had concentrations of PAHS in the effluents below the detection level.  相似文献   
9.
Multimedia Tools and Applications - Studies of visual attention of patients with Dementia such as Parkinson’s Disease Dementia and Alzheimer Disease is a promising way for non-invasive...  相似文献   
10.
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