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   1374篇
  免费   72篇
  国内免费   2篇
电工技术   4篇
化学工业   273篇
金属工艺   12篇
机械仪表   18篇
建筑科学   105篇
矿业工程   2篇
能源动力   17篇
轻工业   194篇
水利工程   14篇
石油天然气   7篇
无线电   82篇
一般工业技术   234篇
冶金工业   286篇
原子能技术   2篇
自动化技术   198篇
  2023年   16篇
  2022年   23篇
  2021年   59篇
  2020年   30篇
  2019年   51篇
  2018年   29篇
  2017年   44篇
  2016年   53篇
  2015年   46篇
  2014年   54篇
  2013年   107篇
  2012年   68篇
  2011年   110篇
  2010年   90篇
  2009年   76篇
  2008年   97篇
  2007年   64篇
  2006年   56篇
  2005年   50篇
  2004年   38篇
  2003年   45篇
  2002年   38篇
  2001年   18篇
  2000年   16篇
  1999年   11篇
  1998年   9篇
  1997年   16篇
  1996年   12篇
  1995年   8篇
  1994年   11篇
  1993年   9篇
  1992年   9篇
  1991年   5篇
  1990年   5篇
  1989年   4篇
  1988年   5篇
  1987年   4篇
  1986年   7篇
  1985年   3篇
  1984年   7篇
  1983年   6篇
  1982年   3篇
  1981年   4篇
  1980年   4篇
  1979年   3篇
  1978年   5篇
  1977年   4篇
  1976年   4篇
  1966年   2篇
  1963年   2篇
排序方式: 共有1448条查询结果,搜索用时 15 毫秒
41.
Levels of awareness for trauma and their consequences for research, treatment, and prevention within professional psychology and society are considered. When people must endure chronically traumatic environments, it may be adaptive to isolate from awareness information that would produce cognitive dissonance and threaten necessary relationships. Unawareness may also facilitate functioning in environments that invalidate the prevalence and impact of trauma. In addition, characteristics of the posttraumatic environment can promote or impede individuals' awareness of trauma and their psychological functioning. Though often initially adaptive, unawareness for trauma is linked to intergenerational transmission of trauma and its effects and may preclude public and professional attention to trauma treatment and prevention. Understanding the processes through which individuals become unaware or aware of traumatic experience is therefore essential to conducting effective psychotherapy with trauma survivors. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
42.
Systemic lupus erythematosus (SLE) is a chronic multi-organ autoimmune disease characterized by hyperactivated immune responses to self-antigens and persistent systemic inflammation. Previously, we reported abnormalities in circulating and bone marrow (BM)-derived plasmacytoid dendritic cells (pDCs) from SLE patients. Here, we aim to seek for potential regulators that mediate functional aberrations of pDCs in SLE. BM-derived pDCs from NZB/W F1 mice before and after the disease onset were compared for toll-like receptor (TLR) induced responses and microRNA profile changes. While pDCs derived from symptomatic mice were phenotypically comparable to pre-symptomatic ones, functionally they exhibited hypersensitivity to TLR7 but not TLR9 stimulation, as represented by the elevated upregulation of CD40, CD86 and MHC class II molecules upon R837 stimulation. Upregulated induction of miR-155 in symptomatic pDCs following TLR7 stimulation was observed. Transfection of miR-155 mimics in pre-symptomatic pDCs induced an augmented expression of Cd40, which is consistent with the increased CD40 expression in symptomatic pDCs. Overall, our results provide evidence for miR-155-mediated regulation in pDC functional abnormalities in SLE. Findings from this study contribute to a better understanding of SLE pathogenesis and ignite future interests in evaluating the molecular regulation in autoimmunity.  相似文献   
43.
44.
Many times both physicians and patients take for granted that they are qualified to treat certain ages and certain conditions. Neurological conditions are diagnosed and treated by neurologists, pediatric neurologists, and neurosurgeons. What is the difference and why does it matter? It is a balancing act of risk and benefit and the physician’s obligation to know her/his limitations. Telemedicine may play a key role in enabling a greater access to pediatric neurologists. If telemedicine becomes more available, then access even in more remote areas without child neurologists may be possible. As this article discusses, there may be certain limitations to using telemedicine, which is distinguishable from telehealth, in relation to pediatric neurology. This article examines the type of neurological physician that is the most appropriate; the availability of and access to pediatric neurologists; and the applicability of telemedicine to the diagnosis and treatment of pediatric neurological conditions.  相似文献   
45.
Chitosan (CS) has received much attention as a functional biopolymer for designing various hydrogels for biomedical applications. This review provides an overview of the different types of CS‐based hydrogels, the approaches that can be used to fabricate hydrogel matrices with specific features and their applications in controlled drug delivery and tissue engineering. Emphasis is laid on the recent design concepts of hybrid hydrogels based on mixtures of CS and natural or synthetic polymers, interpenetrating polymer networks as well as composite hydrogels prepared by embedding nanoparticles into CS matrices. © 2017 Society of Chemical Industry  相似文献   
46.
This study expands the relational turbulence model (RTM; Solomon & Knobloch,) by theorizing about how characteristics of relationships and relational judgments influence people's experiences of hurtful messages. Previous applications of RTM to hurt have uncovered associations among relational characteristics that influence people's hurtful experiences; however, the process by which these characteristics influence experiences of hurt remains unclear. We propose that relational communication (specifically, perceptions of dominance, and disaffiliation) is the mechanism linking relational qualities to hurt. A multigroup SEM was conducted to test for the possibility of sex differences. Results showed that people's experiences of hurt vary as a function of both relationship characteristics and relational inferences. Results also indicated a difference in path coefficients for males and females.  相似文献   
47.
48.
49.
The goal of this research was to determine whether or not there was a difference between consumer preferences for color harmonies for products where external labels and visible product existed simultaneously. Using established color theory, transparent packages containing visible products with colored labels were evaluated. Eye tracking metrics and overall preference testing were used to assess these products. Eye tracking data yielded quantitative data that was statistically analyzed using analysis of variance. A post experiment survey was given to participants to collect demographics and additional data was completed through chi‐squared tests for association. No significant difference was found between color harmonies and preference, nor was there significance for the eye tracking metrics. These results of no significance are ideal for designers because it gives them the freedom to use their judgment when designing packaging labels. © 2016 Wiley Periodicals, Inc. Col Res Appl, 42, 50–59, 2017  相似文献   
50.
In the past two decades, bulk heterojunction organic photovoltaic (OPV) devices have emerged as attractive candidates for solar energy conversion due to their lightweight design and potential for low‐cost, high‐throughput, solution‐phase processability. Interfacial engineering is a proven efficient approach to achieve OPV devices with high power conversion efficiencies. This mini‐review provides an overview of the key structural considerations necessary when undertaking the molecular design of conjugated polyelectrolytes, for application as interfacial layers (ILs). The different roles of ILs are outlined, together with the advantages and disadvantages of competing classes of IL materials. Particular emphasis is placed on the design and synthesis of water‐soluble polythiophene‐based IL materials and the influence of their structural characteristics on their performance as a promising class of IL material. Finally, the challenges and opportunities for polythiophenes as IL materials for OPV devices and other solution‐processed solar cell technologies (e.g. perovskite solar cells) are discussed. © 2017 Society of Chemical Industry  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