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   83篇
  免费   5篇
化学工业   14篇
金属工艺   1篇
建筑科学   3篇
轻工业   3篇
水利工程   1篇
石油天然气   2篇
无线电   2篇
一般工业技术   16篇
冶金工业   41篇
自动化技术   5篇
  2022年   1篇
  2021年   1篇
  2020年   3篇
  2019年   1篇
  2018年   3篇
  2017年   2篇
  2016年   1篇
  2014年   1篇
  2013年   2篇
  2012年   3篇
  2011年   3篇
  2010年   1篇
  2008年   2篇
  2007年   4篇
  2006年   1篇
  2004年   1篇
  2003年   3篇
  2002年   1篇
  2001年   2篇
  2000年   3篇
  1999年   2篇
  1998年   7篇
  1997年   5篇
  1996年   2篇
  1995年   2篇
  1994年   1篇
  1993年   2篇
  1992年   1篇
  1990年   2篇
  1989年   4篇
  1988年   2篇
  1987年   3篇
  1986年   2篇
  1985年   4篇
  1983年   1篇
  1982年   2篇
  1979年   2篇
  1977年   2篇
  1939年   1篇
  1938年   1篇
  1937年   1篇
排序方式: 共有88条查询结果,搜索用时 15 毫秒
21.
22.
23.
Psychologists increasingly have the opportunity to work with persons with serious and chronic mental illnesses. Managed care encourages services that rely less on hospital treatment and more on a combination of brief and intensive outpatient therapy and long-term, low-cost maintenance and support. Diagnostic practices needed to be effective in such an environment include categorical and functional assessment. Psychological treatments that have been demonstrated effective include cognitive-behavioral social skills training, pragmatic supportive therapy, personal therapy, the multimodal functional model, therapeutic contracting, case management, and multiple family therapy. These innovative assessment and treatment techniques are described along with some experimental treatments of cognitive dysfunction. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
24.
205 (113 male, 92 female) nonhospitalized recovering alcoholics with >3 mo of continuous abstinence from alcohol and drugs and relatively heavy tobacco dependence (Fagerstrom Tolerance Questionnaire score?=? 7.7; mean number of cigarettes per day, 26.8; mean number of years smoked, 24.4) were randomized to standard treatment (ST) American Lung Association quit program plus nicotine anonymous meetings (n?=?70), behavioral counseling plus physical exercise (BEX; n?=?72), or behavioral counseling plus nicotine gum (BNIC; n?=?63). A 3?×?4 repeated measures design was used to evaluate the effectiveness of the interventions on smoking outcome at baseline, posttreatment, and 6- and 12-mo follow-ups. Self-reported smoking status was verified with biochemical and informant report. Verified self-report indicated that significantly more smokers in BEX quit by posttreatment (60%) than in either BNIC (52%) or ST (31%), χ–2(2, N?=?205)?=?17.85, p?  相似文献   
25.
26.
Epilepsy is a heterogenous neurological disorder characterized by recurrent unprovoked seizures, mitochondrial stress, and neurodegeneration. Hydrogen sulfide (H2S) is a gasotransmitter that promotes mitochondrial function and biogenesis, elicits neuromodulation and neuroprotection, and may acutely suppress seizures. A major gap in knowledge remains in understanding the role of mitochondrial dysfunction and progressive changes in H2S levels following acute seizures or during epileptogenesis. We thus sought to quantify changes in H2S and its methylated metabolite (MeSH) via LC-MS/MS following acute maximal electroshock and 6 Hz 44 mA seizures in mice, as well as in the early phases of the corneally kindled mouse model of chronic seizures. Plasma H2S was acutely reduced after a maximal electroshock seizure. H2S or MeSH levels and expressions of related genes in whole brain homogenates from corneally kindled mice were not altered. However, plasma H2S levels were significantly lower during kindling, but not after established kindling. Moreover, we demonstrated a time-dependent increase in expression of mitochondrial membrane integrity-related proteins, OPA1, MFN2, Drp1, and Mff during kindling, which did not correlate with changes in gene expression. Taken together, short-term reductions in plasma H2S could be a novel biomarker for seizures. Future studies should further define the role of H2S and mitochondrial stress in epilepsy.  相似文献   
27.
Natural hazards present a ubiquitous challenge to the successful practice of viticulture. This article reports on the results of a research study conducted to ascertain the effects of natural hazards on viticulture in Texas. It examines the locational differences in the types of natural hazards that affect viticulture, as well as differences in mitigation techniques used by growers in different parts of the state. Results from an online survey indicate that most crop losses in Texas occurred as a result of multiple hazards having a cumulative effect over time. Analyses of survey data also show that viticultural crop loss as a result of one or a combination of natural hazards appears to affect Texas growers almost equally, regardless of prior professional experience (agricultural or non-agricultural) or whether a grower retains crop insurance. A thorough understanding of the types of hazards that may impact viticulture in Texas, along with the types of mitigation measures that are employed to combat those hazards, may prove invaluable those new to the field before the decision is made to invest in a new vineyard.  相似文献   
28.
29.
We present calculations of the thermal conductivity, viscosity, and longitudinal spin diffusion of degenerate3He-4He mixtures as a function of spin polarization. Physical arguments and sum rules are used to describe qualitatively the behavior of the effective interactions between two3He quasiparticles. A recently proposed potential model is consistent with these expectations and provides the momentum- and polarization-dependent transition probabilities that enter into transport calculations. In the limit of small3He concentrations, our results agree with previous calculations based on the hard sphere model. For concentrations nearing saturation, however, we find structure in the thermal conductivity as a function of polarization with the3He density kept fixed. While the behavior of the viscosity remainsqualitatively similar to that at low concentration, the spin diffusion coefficient is qualitatively different. This behavior of the transport coefficients is largely a consequence of the strongly polarization dependentm z =1 triplet scattering rate which becomes comparable to that in the singlet channel at large polarizations.  相似文献   
30.
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