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   113篇
  免费   0篇
电工技术   2篇
化学工业   32篇
金属工艺   2篇
机械仪表   3篇
建筑科学   1篇
能源动力   3篇
轻工业   12篇
水利工程   1篇
无线电   12篇
一般工业技术   12篇
冶金工业   13篇
自动化技术   20篇
  2024年   3篇
  2023年   2篇
  2022年   2篇
  2021年   5篇
  2020年   5篇
  2019年   6篇
  2018年   3篇
  2017年   2篇
  2016年   3篇
  2015年   1篇
  2014年   1篇
  2013年   12篇
  2012年   8篇
  2011年   5篇
  2010年   9篇
  2009年   5篇
  2008年   4篇
  2007年   4篇
  2006年   6篇
  2005年   7篇
  2004年   3篇
  2002年   4篇
  2000年   1篇
  1999年   5篇
  1996年   2篇
  1995年   1篇
  1991年   1篇
  1988年   1篇
  1983年   1篇
  1979年   1篇
排序方式: 共有113条查询结果,搜索用时 0 毫秒
71.
72.
73.
Religion helps people maintain a sense of control, particularly secondary control—acceptance of and adjustment to difficult situations—and contributes to strengthening social relationships in a religious community. However, little is known about how culture may influence these effects. The current research examined the interaction of culture and religion on secondary control and social affiliation, comparing people from individualistic cultures (e.g., European Americans), who tend to be more motivated toward personal agency, and people from collectivistic cultures (e.g., East Asians), who tend to be more motivated to maintain social relationships. In Study 1, an analysis of online church mission statements showed that U.S. websites contained more themes of secondary control than did Korean websites, whereas Korean websites contained more themes of social affiliation than did U.S. websites. Study 2 showed that experimental priming of religion led to acts of secondary control for European Americans but not Asian Americans. Using daily diary methodology, Study 3 showed that religious coping predicted more secondary control for European Americans but not Koreans, and religious coping predicted more social affiliation for Koreans and European Americans. These findings suggest the importance of understanding sociocultural moderators for the effects of religion. (PsycINFO Database Record (c) 2011 APA, all rights reserved)  相似文献   
74.
The design of an S-band, broadband, microstrip 3 dB, 90 degrees branchline coupler is described and measured results for a prototype version are given. The design uses broadbanding stubs and three branches, with the central branch split into two of twice the characteristic impedance and separated by half wavelength transmission lines. This is a new technique to improve the bandwidth of which a theoretical account was given by Mayer (see ibid., vol.26, no.18, p.1477-8, 1990). Measured results for the prototype coupler show return loss greater than 17 dB and isolation greater than 16.5 dB, over a percentage bandwidth of 45%.<>  相似文献   
75.
    
The assessment of military camouflage is a key consideration in the modern military field. Traditionally, the assessment relies on traditional human visual detection tests because a large scale multi‐level and multi‐factor experiments are time‐ and resource‐consuming. One aspect of camouflage assessment, to which this current study pertains, entails improving upon or “enhancing” an existing or “selected” design. The current study presents a new and practical approach for enhancing the selected military camouflage by utilizing response surface methodology (RSM) of %L*, %a*, and %b* in CIELAB color space. Ten participants were recruited to evaluate 35 variations of %L*, %a*, and %b* on camouflage similarity index (CSI) and reaction time (RT). Based on RSM, the optimum combination occurs at L*: 61.4966, a*: ?5.6505, and b*: 10.5114. In addition, a predictive algorithm to calculate the optimum shift of %L*, %a*, and %b* from the original camouflage to the improved camouflage derived from RSM is also proposed. The optimum shift occurs at ?25%L*, ?55%a*, and + 80%b*. In the end, a new design guideline is proposed for the enhancement of selected military camouflage, which adopts the present study's research findings.  相似文献   
76.
    
Enhancing an existing military camouflage is an important component during the assessment of military camouflage. The current study proposed a new and practical approach to enhancing the undetectability of a military camouflage using particle swarm optimization (PSO). Eight different locations (20 × 50 pixels) in the one swamp background were selected to be the place of a human‐shaped target. The PSO would generate newly proposed camouflage as an empirical parameter based on the lower and the upper bounds from selected four different colors in swamp background. The predictive algorithm was applied to adjust the optimum shift of %L*, %a*, and %b* from the original to the empirical parameter. Thirty participants were recruited to evaluate the original and newly proposed camouflages. Paired sample t test indicates that the newly proposed military camouflage had a significant lower camouflage similarity index value and a longer detection time. The PSO shows to be a method with good results; however, a comprehensive study using multiple backgrounds and patterns would be required to generalize the methodology to other background environments or camouflage patterns.  相似文献   
77.
    
There is ample evidence that nucleocytoplasmic-transport deficits could play an important role in the pathology of amyotrophic lateral sclerosis (ALS). However, the currently available data are often circumstantial and do not fully clarify the exact causal and temporal role of nucleocytoplasmic transport deficits in ALS patients. Gaining this knowledge will be of great significance in order to be able to target therapeutically nucleocytoplasmic transport and/or the proteins involved in this process. The availability of good model systems to study the nucleocytoplasmic transport process in detail will be especially crucial in investigating the effect of different mutations, as well as of other forms of stress. In this review, we discuss the evidence for the involvement of nucleocytoplasmic transport defects in ALS and the methods used to obtain these data. In addition, we provide an overview of the therapeutic strategies which could potentially counteract these defects.  相似文献   
78.
While destructive financial behaviors permeate our culture, the field of psychology has remained relatively silent on the issue. This article argues for the need for psychologists to identify disordered money behaviors as treatable psychological problems and provide the public with effective approaches to treatment. It describes one such experimental treatment utilizing experiential therapy and examines treatment outcomes of 33 individuals with problematic financial behaviors who participated in a 6-day experiential therapy program. Following treatment, participants showed significant and lasting reductions in psychological distress, anxiety, and worry about money and finance-related situations and showed measurable signs of better overall financial health. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
79.
This paper describes one anthropomorphic modular reconfigurable gripper for robots, including a prototype and one command solution. For the first time the stages of synthesis, analysis design and functional simulation are presented. The structural synthesis of the anthropomorphic grippers for robots can be made regarding the following main criteria: the number of fingers, the number of phalanxes, the relative dimensions of the phalanxes, the relative position of the fingers, the degree of freedom of the gripping mechanism and the characteristic constructive elements used. We have chosen a version with three identical fingers with three phalanxes on finger. The kinematic synthesis is used to obtain a correct closing of the finger and of the gripping mechanism. The static synthesis solves the problem to obtaining the necessary gripping force on each finger and the total gripping force. With the constructive dimensions a 3D model can be obtained using CATIA soft. Aspects regarding functional CAD and virtual simulations are shown too. For one variant of this type of gripper, the technical documentation is completed and the technical project has all the conditions for practical achievement and a prototype was made. There are two main constructive modules: the support, the palm and the finger. Main technical characteristics of the prototype are indicated. Some aspects regarding actuated and command schemes are shown.  相似文献   
80.
A new type of two-dimensional automaton has been defined to recognize a class of two-dimensional shifts of finite type having the property that every admissible block found within the related local picture language can be extended to a point of the subshift. Here it is shown that this automaton accurately represents the image of the represented two-dimensional shift of finite type under a block code. It is then shown that these automata can be used to check for a certain type of two-dimensional transitivity in the factor language of the corresponding shift space and how this relates to periodicity in the two-dimensional case. The paper closes with a notion of “follower sets” that are used to reduce the size of the automata representing two-dimensional sofic shifts.  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