全文获取类型
收费全文 | 229篇 |
免费 | 0篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 40篇 |
机械仪表 | 2篇 |
建筑科学 | 4篇 |
能源动力 | 1篇 |
轻工业 | 6篇 |
无线电 | 32篇 |
一般工业技术 | 44篇 |
冶金工业 | 65篇 |
原子能技术 | 1篇 |
自动化技术 | 32篇 |
出版年
2023年 | 2篇 |
2022年 | 11篇 |
2021年 | 14篇 |
2020年 | 2篇 |
2019年 | 3篇 |
2018年 | 4篇 |
2017年 | 2篇 |
2016年 | 1篇 |
2015年 | 1篇 |
2014年 | 6篇 |
2013年 | 10篇 |
2012年 | 9篇 |
2011年 | 7篇 |
2010年 | 2篇 |
2009年 | 8篇 |
2008年 | 6篇 |
2007年 | 5篇 |
2006年 | 10篇 |
2005年 | 4篇 |
2004年 | 5篇 |
2003年 | 10篇 |
2002年 | 5篇 |
2001年 | 4篇 |
2000年 | 4篇 |
1999年 | 12篇 |
1998年 | 23篇 |
1997年 | 14篇 |
1996年 | 8篇 |
1995年 | 6篇 |
1994年 | 5篇 |
1993年 | 4篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1986年 | 1篇 |
1983年 | 2篇 |
1981年 | 2篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 5篇 |
1971年 | 1篇 |
1966年 | 1篇 |
排序方式: 共有229条查询结果,搜索用时 0 毫秒
31.
Galtarossa A. Yongmin Jung Kim M.J. Lee B.H. Kyunghwan Oh Un-Chul Paek Palmieri L. Pizzinat A. Schenato L. 《Lightwave Technology, Journal of》2005,23(12):4184-4191
Spinning a fiber is the most viable and used technique to reduce polarization mode dispersion (PMD). Many papers have shown that by properly tuning the spin parameters, the differential group delay (DGD) of spun fibers can be greatly reduced. However, the precision with which these optimal profiles are practically implemented may be a problem. In this paper, we perform a statistical analysis of the effects that spin inaccuracy may have on fiber PMD, quantifying how the random uncertainty on spin parameters impairs the DGD. Some preliminary experimental results about spin-induced PMD reduction are also reported. 相似文献
32.
G Fiermonte L Palmieri V Dolce FM Lasorsa F Palmieri MJ Runswick JE Walker 《Canadian Metallurgical Quarterly》1998,273(38):24754-24759
33.
A. Galtarossa L. Palmieri 《Photonics Technology Letters, IEEE》2003,15(1):57-59
34.
Compton Rebecca J.; Heller Wendy; Banich Marie T.; Palmieri Patrick A.; Miller Gregory A. 《Canadian Metallurgical Quarterly》2000,14(2):254
This investigation examined how hemispheric asymmetry and interhemispheric processing contribute to attentional biases toward emotional information. Participants (n?=?88) named the color of lateralized squares presented concurrently with neutral, positive, or threatening words. A left-hemisphere advantage in color naming was reduced when distractors were emotional, suggesting right-hemisphere priming by emotional stimuli. Furthermore, the advantage of dividing the word and color across visual fields was increased for emotion words when they were frequently presented, indicating a strategic use of interhemispheric division of labor to reduce the distracting effect of emotional words. Finally, participants with high levels of anxious apprehension were most likely to make use of this interhemispheric processing strategy, supporting a processing efficiency theory of cognitive function in anxiety. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
35.
Using standard results from the adaptive signal processing literature, we review the learning behavior of various constrained linear neural networks made up of anti-Hebbian synapses, where learning is driven by the criterion of minimizing the node information energy. We point out how simple learning rules of Hebbian type can provide fast self-organization, under rather wide connectivity constraints. We verify the results of the theory in a set of simulations. 相似文献
36.
PC Braga M Dal Sasso S Maci G Piatti R Palmieri L Bruno C Albanese 《Canadian Metallurgical Quarterly》1994,6(5):354-359
Senescence is a specific physiological evolution of human beings associated with a reduction in the functionality of several apparatuses, including the immune system. Thymomodulin (TMD) contains thymus polypeptides (< 10,000 D) and it has been used in a variety of disorders associated with defective immunological functions. The aim of this study was to investigate the effect on polymorphonuclear leukocyte (PMNs) phagocytosis and oxidative burst of a 6-week treatment with 160 mg/day TMD orally in elderly subjects (85.5 +/- 9.7 years). Elderly subjects have impaired PMN phagocytosis and the following release of oxidant radicals. Treatment with TMD for 6 weeks had a restoring effect; phagocytosis and the phagocytic index were significantly improved, with increases of 132.6% and 112.5%. These findings indicate that TMD might be given to enhance the immunodefenses of immunocompromised elderly subjects. Luminol-dependent chemiluminescence was increased by 15.6%, which was not significant, indicating a different response between phagocytosis and release of oxidant radicals. 相似文献
37.
A. Andreone A. Barone A. Di Chiara F. Fontana G. Mascolo V. Palmieri G. Peluso G. Pepe U. Scotti Di Uccio 《Journal of Superconductivity and Novel Magnetism》1989,2(4):493-500
superconducting thin films by Mo75Re25 single-target magnetron sputtering at various temperatures on sapphire substrates were prepared. Sharp superconductive transitions andT c values above 10 K were achieved, and the deposited films showed a good metallic behavior. According to structural analyses (EDS and X-rays), all the samples have the same stoichiometry as the target and, even at low deposition temperatures, they exhibit theA15 phase. From measured residual resistivities and superconducting critical temperatures the theoretical BCS surface resistances were estimated and compared to those o Mo60Re40 films, presented in a previous work. Both these alloys, in fact, being characterized by low surface resistances and high critical fields, are good candidates as coating films in r.f. cavities. 相似文献
38.
The clinical, immunological, and immunoistochemical features of 10 thyroid cancers associated with intra and extra tumoral thyroiditis are described. These cases have been obtained from a review of 806 thyroidectomies. A proper distinction of the described pathology from the immunological and histological point of view, is emphasized, especially if compared with the prognosis of other thyroid cancers. 相似文献
39.
Anthony Palmieri Iii 《Drug development and industrial pharmacy》1977,3(4):309-314
Until the last five years, study of microcapsules formed by complex coacervation has been approached almost entirely on an empirical basis. The gelatin-acacia coating formed through complex coacervation is responsible for the sustained release characteristics of the dosage form. Because dissolution of the drug from microcapsules is often limited by the structure and nature of the shell wall, of prime interest would be the construction of an acacia-gelatin film for diffusion studies. Apparent optimal conditions for production of the coacervate film were developed. The conditions were similar to those used to produce microcapsules by various researchers. These conditions produced a coacervate film which could be cut into two square centimeter sections apparently suitable for diffusion studies. Films produced by complex coacervation appeared free from structural defects when observed with a stereo-microscope. 相似文献
40.
A. Palmieri III J. M. Lausier A. N. Paruta 《Drug development and industrial pharmacy》1976,2(2):171-192
The rates of oxidative decomposition for pyrogallol were determined at 3.0° in vehicles which had been prepared by passing deionized distilled water through a gas permeator. The vehicles prepared by gas permeation possessed varying dissolved oxygen concentrations which depended upon charging pressure and the residence time of effluent. A single pass through the permeator produced vehicles possessing dissolved oxygen concentrations of 05 ppm to 0.78 ppm with respect to a normal oxygen content of 8-9 ppm. A double pass through the permeator gave only trace amounts of dissolved oxygen. i.e., 0.01-0.02 ppm and this was found to be independent of charging pressure. 相似文献