全文获取类型
收费全文 | 9513篇 |
免费 | 462篇 |
国内免费 | 20篇 |
专业分类
电工技术 | 97篇 |
综合类 | 4篇 |
化学工业 | 1958篇 |
金属工艺 | 140篇 |
机械仪表 | 188篇 |
建筑科学 | 613篇 |
矿业工程 | 21篇 |
能源动力 | 317篇 |
轻工业 | 839篇 |
水利工程 | 108篇 |
石油天然气 | 28篇 |
无线电 | 696篇 |
一般工业技术 | 1938篇 |
冶金工业 | 1242篇 |
原子能技术 | 36篇 |
自动化技术 | 1770篇 |
出版年
2023年 | 70篇 |
2022年 | 135篇 |
2021年 | 214篇 |
2020年 | 175篇 |
2019年 | 210篇 |
2018年 | 232篇 |
2017年 | 231篇 |
2016年 | 254篇 |
2015年 | 226篇 |
2014年 | 334篇 |
2013年 | 657篇 |
2012年 | 554篇 |
2011年 | 785篇 |
2010年 | 501篇 |
2009年 | 472篇 |
2008年 | 586篇 |
2007年 | 509篇 |
2006年 | 433篇 |
2005年 | 386篇 |
2004年 | 328篇 |
2003年 | 306篇 |
2002年 | 276篇 |
2001年 | 146篇 |
2000年 | 155篇 |
1999年 | 133篇 |
1998年 | 133篇 |
1997年 | 143篇 |
1996年 | 130篇 |
1995年 | 113篇 |
1994年 | 88篇 |
1993年 | 84篇 |
1992年 | 80篇 |
1991年 | 61篇 |
1990年 | 75篇 |
1989年 | 61篇 |
1988年 | 42篇 |
1987年 | 59篇 |
1986年 | 52篇 |
1985年 | 56篇 |
1984年 | 52篇 |
1983年 | 68篇 |
1982年 | 49篇 |
1981年 | 40篇 |
1980年 | 36篇 |
1979年 | 38篇 |
1978年 | 29篇 |
1977年 | 26篇 |
1976年 | 23篇 |
1975年 | 22篇 |
1974年 | 14篇 |
排序方式: 共有9995条查询结果,搜索用时 0 毫秒
31.
The group scanning model of feature integration theory suggests that Ss search visual displays serially by groups, but process items within each group in parallel. Group size is determined by the discriminability of the targets in the background of distractors. When the target is poorly discriminable, the size of the scanned group will be small, and search will be slow. The model predicts that group size will be smallest when targets of an intermediate value on a perceptual dimension are presented in a heterogeneous background of distractors that have higher and lower values on the same dimension. Experiment 1 (30 Ss) demonstrates this effect; Exp 2 (12 Ss) controls for a possible confound of decision complexity in Exp 1. For simple feature targets, the group scanning model provides a good account of the visual search process. (French abstract) (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
32.
Assessed whether resting anterior asymmetry would discriminate individual differences in repressive-defensive coping styles. In 2 sessions, resting electroencephalogram was recorded from female adults during 8 60-sec baselines. Ss were classified as repressors or nonrepressors on the basis of scores on the Marlowe-Crowne Social Desirability Scale (MC), the State-Trait Anxiety Inventory (STAI), and the Beck Depression Inventory (BDI). In midfrontal and lateral frontal sites, repressors demonstrated relative left hemisphere activation when compared with other groups. The MC, but not the STAI or the BDI, contributed unique variance to frontal asymmetry. Relative left frontal activation may be linked to a self-enhancing regulatory style that promotes lowered risk for psychopathology. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
33.
Andrew Klapper 《Journal of Cryptology》1994,7(1):33-51
A new method of cryptologic attack on binary sequences is given, using their linear complexities relative to odd prime numbers. We show that, relative to a particular prime number p, the linear complexity of a binary geometric sequence is low. It is also shown that the prime p can be determined with high probability by a randomized algorithm if a number of bits much smaller than the linear complexity is known. This determination is made by exploiting the imbalance in the number of zeros and ones in the sequences in question, and uses a new statistical measure, the partial imbalance.This project was sponsored by the National Security Agency under Grant No. MDA904-91-H-0012. The United States Government is authorized to reproduce and distribute reprints notwithstanding any copyright notation hereon. 相似文献
34.
Self-efficacy expectations predict survival for patients with chronic obstructive pulmonary disease.
Kaplan Robert M.; Ries Andrew L.; Prewitt Lela M.; Eakin Elizabeth 《Canadian Metallurgical Quarterly》1994,13(4):366
Evaluated the validity of self-efficacy expectations as predictors of mortality for 119 patients with chronic obstructive pulmonary disease. Ss completed 4 physiological measures that represent common clinical indicators of disease severity: forced expiratory volume in 1 s(FEV1.0), arterial blood gas measurement of resting partial pressure of oxygen (PaO?), single-breath diffusing capacity (DLCO), and maximum oxygen uptake (V02max) during exercise. In addition, self-reported self-efficacy expectation for walking on a treadmill was measured. Self-efficacy was a significant univariate predictor of 5-yr survival. However, when controlling for FEV1.0 in multivariate survival analysis, self-efficacy had only a marginal effect. Simple self-report scales may provide significant information about health status. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
35.
Examined pre- and posttreatment changes in life stressors and social resources and their association with treatment outcomes in a 12-mo follow-up of 424 Ss (aged 18–83 yrs) with unipolar depression. Assessment measures included the Family Environment Scale, Work Environment Scale, and Health and Daily Living Form. As expected, Ss reported significant, multidimensional improvements in their functioning at follow-up. There were modest increases in Ss' social resources but, suprisingly, no overall decrease in stressors. Life stress and resource factors were significantly related to Ss' functioning at follow-up, even after considering the severity of their dysfunction at treatment intake and their length of treatment. Implications for developing a general body of knowledge about the process of recovery and relapse in behavioral disorders are discussed. (38 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
36.
Bruce P. Johnston John M. Sullivan Andrew Kwasnik 《International journal for numerical methods in engineering》1991,31(1):67-84
A method is presented for the fully automatic conversion of a general finite element mesh containing triangular elements into a mesh composed of exclusively quadrilateral elements. The initial mesh may be constructed of entirely triangular elements or may consist of a mixture of triangular and quadrilateral elements. The technique used employs heuristic procedures and criteria to selectively combine adjacent triangular elements into quadrilaterals based on preestablished criteria for element quality. Additional procedures are included to eliminate isolated triangles. The methods operates completely without user intervention once the nodal co-ordinates and element connectivity of the original mesh are supplied. 相似文献
37.
White-salted cheeses were prepared from ultrafiltered (UF) cows' milk and salted to give final salt-in-moisture (SM) levels of 2.5, 3.2 and 4.0%. The cheeses were stored at 5°C and 10°C for up to 15 weeks. The microflora was dominated by lactic acid bacteria (LAB) but some mould growth was evident within 15 weeks at all SM levels and both temperatures. Levels of water-soluble nitrogen (WSN), attributed to chymosin activity, increased significantly with time, the rate being inversely proportional to the SM level and increasing with storage temperature. Similar effects were noted for trichloroacetic acid-soluble nitrogen (TCA-SN) and free amino acid (FAA) levels, both of which would also be affected by bacterial protease activity. The proteolytic activity was reflected by changes in the hardness and fracturability of the cheeses. 相似文献
38.
Recent Advances in Hierarchical Reinforcement Learning 总被引:16,自引:0,他引:16
Reinforcement learning is bedeviled by the curse of dimensionality: the number of parameters to be learned grows exponentially with the size of any compact encoding of a state. Recent attempts to combat the curse of dimensionality have turned to principled ways of exploiting temporal abstraction, where decisions are not required at each step, but rather invoke the execution of temporally-extended activities which follow their own policies until termination. This leads naturally to hierarchical control architectures and associated learning algorithms. We review several approaches to temporal abstraction and hierarchical organization that machine learning researchers have recently developed. Common to these approaches is a reliance on the theory of semi-Markov decision processes, which we emphasize in our review. We then discuss extensions of these ideas to concurrent activities, multiagent coordination, and hierarchical memory for addressing partial observability. Concluding remarks address open challenges facing the further development of reinforcement learning in a hierarchical setting. 相似文献
39.
Schnurr Paula P.; Hayes Andrew F.; Lunney Carole A.; McFall Miles; Uddo Madeline 《Canadian Metallurgical Quarterly》2006,74(4):707
This study examined how change in posttraumatic stress disorder (PTSD) symptoms relates to change in quality of life. The sample consisted of 325 male Vietnam veterans with chronic PTSD who participated in a randomized trial of group psychotherapy. Latent growth modeling was used to test for synchronous effects of PTSD symptom change on psychosocial and physical health-related quality of life within the same time period and lagged effects of initial PTSD symptom change on later change in quality of life. PTSD symptoms were associated with reduced quality of life before treatment. There were synchronous effects of symptom change on change in quality of life but no significant lagged effects. Results indicate the importance of measuring quality of life in future investigations of PTSD treatment. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
40.
In a change detection paradigm, a target object in a natural scene either rotated in depth, was replaced by another object token, or remained the same. Change detection performance was reliably higher when a target postcue allowed participants to restrict retrieval and comparison processes to the target object (Experiment 1). Change detection performance remained excellent when the target object was not attended at change (Experiment 2) and when a concurrent verbal working memory load minimized the possibility of verbal encoding. (Experiment 3). Together, these data demonstrate that visual representations accumulate in memory from attended objects as the eyes and attention are oriented within a scene and that change blindness derives, at least in part, from retrieval and comparison failure. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献