全文获取类型
收费全文 | 2978篇 |
免费 | 220篇 |
国内免费 | 4篇 |
学科分类
工业技术 | 3202篇 |
出版年
2024年 | 2篇 |
2023年 | 29篇 |
2022年 | 18篇 |
2021年 | 133篇 |
2020年 | 76篇 |
2019年 | 89篇 |
2018年 | 98篇 |
2017年 | 92篇 |
2016年 | 143篇 |
2015年 | 113篇 |
2014年 | 145篇 |
2013年 | 219篇 |
2012年 | 202篇 |
2011年 | 230篇 |
2010年 | 192篇 |
2009年 | 191篇 |
2008年 | 177篇 |
2007年 | 165篇 |
2006年 | 117篇 |
2005年 | 93篇 |
2004年 | 117篇 |
2003年 | 96篇 |
2002年 | 62篇 |
2001年 | 47篇 |
2000年 | 41篇 |
1999年 | 30篇 |
1998年 | 22篇 |
1997年 | 15篇 |
1996年 | 29篇 |
1995年 | 26篇 |
1994年 | 24篇 |
1993年 | 19篇 |
1992年 | 19篇 |
1991年 | 10篇 |
1990年 | 6篇 |
1989年 | 11篇 |
1988年 | 2篇 |
1987年 | 12篇 |
1986年 | 5篇 |
1985年 | 15篇 |
1984年 | 17篇 |
1983年 | 8篇 |
1982年 | 7篇 |
1981年 | 7篇 |
1980年 | 3篇 |
1979年 | 6篇 |
1978年 | 4篇 |
1977年 | 6篇 |
1975年 | 3篇 |
1973年 | 3篇 |
排序方式: 共有3202条查询结果,搜索用时 15 毫秒
61.
Alessandro Mantovani Paolo Gisondi Amedeo Lonardo Giovanni Targher 《International journal of molecular sciences》2016,17(2)
Over the past 10 years, it has become increasingly evident that nonalcoholic fatty liver disease (NAFLD) is a multisystem disease that affects multiple extra-hepatic organ systems and interacts with the regulation of several metabolic and immunological pathways. In this review we discuss the rapidly expanding body of clinical and epidemiological evidence supporting a strong association between NAFLD and chronic plaque psoriasis. We also briefly discuss the possible biological mechanisms underlying this association, and discuss treatment options for psoriasis that may influence NAFLD development and progression. Recent observational studies have shown that the prevalence of NAFLD (as diagnosed either by imaging or by histology) is remarkably higher in psoriatic patients (occurring in up to 50% of these patients) than in matched control subjects. Notably, psoriasis is associated with NAFLD even after adjusting for metabolic syndrome traits and other potential confounding factors. Some studies have also suggested that psoriatic patients are more likely to have the more advanced forms of NAFLD than non-psoriatic controls, and that psoriatic patients with NAFLD have more severe psoriasis than those without NAFLD. In conclusion, the published evidence argues for more careful evaluation and surveillance of NAFLD among patients with psoriasis. 相似文献
62.
Adsorption Behavior of Halogenated Anesthetic and Water Vapor on Cr‐Based MOF (MIL‐101) Adsorbent. Part I. Equilibrium and Breakthrough Characterizations 下载免费PDF全文
Ye Hua Nicola Gargiulo Antonio Peluso Paolo Aprea Mladen Eić Domenico Caputo 《化学,工程师,技术》2016,88(11):1730-1738
A synthesized chromium‐based metal organic framework (Cr‐MOF) was used for the adsorption of halogenated anesthetics, i.e., sevoflurane (SF). Adsorption isotherm and breakthrough experiments involving SF (reference sorbate) and water vapor were measured at 298 K and atmospheric pressure on both Cr‐MOF and a commercially used reference adsorbent. The Cr‐MOF MIL‐101 showed a significantly higher SF adsorption capacity and much higher selectivity relative to water vapor compared to the reference adsorbent. Binary‐mixture breakthrough tests demonstrated a “roll‐up effect” for SF on the reference adsorbent while no such effect was observed on MIL‐101. 相似文献
63.
The powder diffraction patterns of spherical nanocrystals made of five different fcc metals were generated using atomistic models within a Molecular Dynamics simulation. Static and dynamic effects are interpreted and discussed within the framework of two different approaches, respectively, based on (1) a Reciprocal Space and (2) a Direct Space representation of diffraction. Chosen elements display a wide range of properties, especially related to material stiffness and elastic anisotropy, so to deeply challenge interpretation paradigms. The effect of the shape on static and dynamic features is also addressed. 相似文献
64.
Paolo Bonavoglia 《Cryptologia》2018,42(3):205-221
Letters, notes, and above all an original notebook by Luigi Sacco dated 1916 have shed new light on the establishment and development of the “Ufficio (or Reparto) Crittografico” of the Italian Army Headquarters in World War I. Three decrypted messages, unpublished until now, are included with Sacco’s comments. 相似文献
65.
Living Labs have received limited attention in the literature despite their diffusion throughout Europe and recent interest from policy makers. This limited attention is linked to the newness of the phenomenon, the high heterogeneity of cases and the consequent lack of definitions and acknowledged frameworks for scholarly analyses. In this work, we argue that the originality of the Living Lab phenomenon resides in the introduction of a new methodology. Using an analysis of the literature and case studies, we propose a new definition, position this methodology among other design methodologies and highlight its peculiarities. We underline the co‐creative potentialities, the awareness of users and the real‐life settings. Furthermore, our case‐based research allows us to identify four different specifications for this methodology, and therefore four different types of Living Labs, based on the openness of the user involvement and the adopted platform technology. 相似文献
66.
Alberto Casagrande Joanna Jarmolowska Marcello Maria Turconi Pierpaolo Busan Piero Paolo Battaglini 《International journal of human-computer interaction》2018,34(12):1085-1104
One application of the P300 brain electric signal is sentence spelling, which enables subjects who have lost control of their motor pathways to communicate by selecting characters in a matrix containing all alphabet symbols. This technology still suffers from both low communication/high error rates. A P300 speller, named PolyMorph, which jointly introduces the selection matrix polymorphism (reducing the matrix size by removing useless symbols) and sentence-based predictions (which forecast words on the basis of language statistics) is presented. This is accomplished by using a custom dynamic knowledge-base, tailored to the subject lexicon, and updated in real time with the selections of the subject. The effectiveness of the presented speller is measured in vivo and in silico. The results suggest that the use of PolyMorph increases the number of spelt characters per time unit and reduces the error rate. 相似文献
67.
68.
Mahmoud Abdellatief Andrea Lausi Jasper R. Plaisier Paolo Scardi 《Metallurgical and Materials Transactions A》2014,45(1):123-128
The growth process of nanocrystalline fluorite was studied by in situ synchrotron radiation X-ray diffraction. The two studied samples had comparable crystalline domain size, but quite different content of lattice defects as a result of the different preparation procedures: ball milling of coarse CaF2 powder or coprecipitation of CaCl2 and NH4F. It is shown that the high dislocation density in the ball-milled fluorite is responsible for a recrystallization process above 773 K (500 °C), which is not observed in the chemically synthesized fluorite. The linear thermal expansion coefficients of both nanocrystalline powders, as obtained and also from the in situ X-ray diffraction data, show a smaller increase with temperature than suggested by the literature on coarse-grained fluorite. 相似文献
69.
70.