全文获取类型
收费全文 | 111篇 |
免费 | 6篇 |
专业分类
电工技术 | 1篇 |
化学工业 | 41篇 |
金属工艺 | 1篇 |
建筑科学 | 5篇 |
能源动力 | 1篇 |
轻工业 | 21篇 |
石油天然气 | 1篇 |
无线电 | 5篇 |
一般工业技术 | 6篇 |
冶金工业 | 17篇 |
自动化技术 | 18篇 |
出版年
2023年 | 4篇 |
2022年 | 11篇 |
2021年 | 11篇 |
2020年 | 5篇 |
2019年 | 2篇 |
2018年 | 3篇 |
2017年 | 8篇 |
2016年 | 3篇 |
2015年 | 4篇 |
2014年 | 5篇 |
2013年 | 4篇 |
2012年 | 7篇 |
2011年 | 11篇 |
2010年 | 2篇 |
2009年 | 3篇 |
2008年 | 11篇 |
2007年 | 4篇 |
2006年 | 4篇 |
2005年 | 5篇 |
2004年 | 2篇 |
2003年 | 2篇 |
2002年 | 1篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1996年 | 1篇 |
排序方式: 共有117条查询结果,搜索用时 15 毫秒
81.
Evangelia Vouvoudi Charikleia Prochaska Tania Panytsidou Eleni Pavlidou 《Polymer-Plastics Technology and Engineering》2015,54(11):1159-1171
The aim of this investigation was the evaluation of both the morphology/surface roughness and the texture/phase distribution of four contemporary dental light-cured nanocomposites using scanning electron microscopy and atomic force microscopy. The materials evaluated were a nanofill composite and three nanohybrids. Scanning electron microscopy coupled with EDS analysis was able to see and identify the large filler particles of the materials. Atomic force microscopy in the tapping mode provided topography of the nanocomposites while the tapping mode coupled with phase imaging information on the surface texture. The differences observed are attributed to differences in the shape, size distribution, amount, and surface coverage of filler particles. 相似文献
82.
83.
84.
Xanthopoulou Despoina; Bakker Arnold B.; Demerouti Evangelia; Schaufeli Wilmar B. 《Canadian Metallurgical Quarterly》2007,14(2):121
This study examined the role of three personal resources (self-efficacy, organizational-based self-esteem, and optimism) in the Job Demands-Resources (JD-R) model. The authors hypothesized that personal resources (1) moderate the relationship between job demands and exhaustion, (2) mediate the relationship between job resources and work engagement, and (3) relate to how employees perceive their work environment and well-being. Hypotheses were tested among 714 Dutch employees. Results showed that personal resources did not offset the relationship between job demands and exhaustion. Instead, personal resources mediated the relationship between job resources and engagement/exhaustion and influenced the perception of job resources. The implications of these findings for the JD-R model are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
85.
Evangelia Xenogiannopoulou Kostas Iliopoulos Stelios Couris Tanya Karakouz Alexander Vaskevich Israel Rubinstein 《Advanced functional materials》2008,18(8):1281-1289
Films of gold nanoscaled islands with thicknesses ranging between 0.5 and 15 nm were prepared by thermal evaporation onto untreated and aminosilane‐pretreated glass substrates. Post‐deposition annealing was found to modify the morphological characteristics of the islands (e.g., average island area and height, inter‐island distance, etc.), resulting in changes of the localized surface plasmon resonance (SPR) characteristics and, therefore, modifying the nonlinear optical (NLO) response of the films. The NLO response of both unannealed and annealed (20 h at 200 °C) films was studied by means of the optical Kerr effect (OKE), using 35 ps, 532 nm laser excitation, while measurements performed by means of the Z‐scan technique allowed for the determination of both the nonlinear refraction and absorption characteristics of the films. The results are discussed and compared with other reports. 相似文献
86.
87.
Maria Kourti Danai Liaropoulou Maria Paschou Ioanna Giagklisi Maria Paschalidi Evangelia Petani Panagiota Papazafiri 《International journal of molecular sciences》2022,23(3)
The two crucial cellular insults that take place during cerebral ischemia are the loss of oxygen and loss of glucose, which can both activate a cascade of events leading to neuronal death. In addition, the toxic overactivation of neuronal excitatory receptors, leading to Ca2+ overload, may contribute to ischemic neuronal injury. Brain ischemia can be simulated in vitro by oxygen/glucose deprivation, which can be reversible by the re-establishment of physiological conditions. Accordingly, we examined the effects of glucose deprivation on the PI3K/Akt survival signaling pathway and its crosstalk with HIF-1α and Ca2+ homeostasis in SH-SY5Y human neuroblastoma cells. It was found that glucose withdrawal decreased HIF-1α protein levels even in the presence of the ischemia-mimicking CoCl2. On the contrary, and despite neuronal death, we identified a strong activation of the master pro-survival kinase Akt, a finding that was also confirmed by the increased phosphorylation of GSK3, a direct target of p-Akt. Remarkably, the elevated Ca2+ influx recorded was found to promptly trigger the activation of Akt, while a re-addition of glucose resulted in rapid restoration of both Ca2+ entry and p-Akt levels, highlighting the plasticity of neurons to respond to ischemic challenges and the important role of glucose homeostasis for multiple neurological disorders. 相似文献
88.
Elizabeth Vafiadaki Kobra Haghighi Demetrios A. Arvanitis Evangelia G. Kranias Despina Sanoudou 《International journal of molecular sciences》2022,23(13)
Phospholamban (PLN), a key modulator of Ca2+-homeostasis, inhibits sarcoplasmic reticulum (SR) calcium-ATPase (SERCA2a) and regulates cardiac contractility. The human PLN mutation R14del has been identified in arrhythmogenic cardiomyopathy patients worldwide and is currently extensively investigated. In search of the molecular mechanisms mediating the pathological phenotype, we examined PLN-R14del associations to known PLN-interacting partners. We determined that PLN-R14del interactions to key Ca2+-handling proteins SERCA2a and HS-1-associated protein X-1 (HAX-1) were enhanced, indicating the super-inhibition of SERCA2a’s Ca2+-affinity. Additionally, histidine-rich calcium binding protein (HRC) binding to SERCA2a was increased, suggesting the inhibition of SERCA2a maximal velocity. As phosphorylation relieves the inhibitory effect of PLN on SERCA2a activity, we examined the impact of phosphorylation on the PLN-R14del/SERCA2a interaction. Contrary to PLN-WT, phosphorylation did not affect PLN-R14del binding to SERCA2a, due to a lack of Ser-16 phosphorylation in PLN-R14del. No changes were observed in the subcellular distribution of PLN-R14del or its co-localization to SERCA2a. However, in silico predictions suggest structural perturbations in PLN-R14del that could impact its binding and function. Our findings reveal for the first time that by increased binding to SERCA2a and HAX-1, PLN-R14del acts as an enhanced inhibitor of SERCA2a, causing a cascade of molecular events contributing to impaired Ca2+-homeostasis and arrhythmogenesis. Relieving SERCA2a super-inhibition could offer a promising therapeutic approach for PLN-R14del patients. 相似文献
89.
Hellweg S Demou E Scheringer M McKone TE Hungerbühler K 《Environmental science & technology》2005,39(19):7741-7748
Life-Cycle Assessment (LCA) aims to assess all environmental impacts "from cradle to grave". Nevertheless, existing methods for Life-Cycle Impact Assessment (LCIA) generally do not consider impacts from chemical exposure at the workplace. This is a severe drawback, because neglecting occupational health effects may result in product or process optimizations at the expense of workers' health. We adapt an existing LCIA method to consider occupational health effects from the use of perchloroethylene (PCE) and trichloroethylene (TCE) in dry cleaning and metal degreasing. The results show that, in applications such as metal degreasing and dry cleaning, long-term (steady-state) concentrations at the workplace are up to 6 orders of magnitude higher than ambient air levels. Legal threshold values may be exceeded, depending on machine technology, size, and surrounding working conditions. The impact from workplace exposure to the total human-toxicity potential of the complete life cycle of PCE and TCE (including use, production, and disposal) is accordingly high. We therefore conclude that occupational health effects need to be considered in LCA to prevent overlooking key environmental-health impacts in LCA. 相似文献
90.
Comment on "Realism, Instrumentalism, and Scientific Symbiosis: Psychological Theory as a Search for Truth and the Discovery of Solutions" by John T. Cacioppo, Gun R. Semin and Gary G. Berntson (see record 2004-14303-001). The appeal for the unification of psychology is in fashion and Cacioppo et al.'s term "symbiosis" connotes a cooperative and communal practice that is difficult to criticize without being regarded as quarrelsome and cantankerous. As Cacioppo et al. stated, the ultimate goal for a unification in psychology should be "to approach or approximate scientific realism" (p. 221). Thus, iterative practice or not, there is no symbiosis, only a reductionistic approach with a gesture toward including positive qualities of instrumentalism. Cacioppo et al. essentially proposed a check-and-balance system for scientific realism which is the ultimate victor. Ramey and Chrysikou go on to discuss the differences between scientific realism and instrumentalism. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献