全文获取类型
收费全文 | 1954篇 |
免费 | 93篇 |
国内免费 | 5篇 |
专业分类
电工技术 | 26篇 |
综合类 | 16篇 |
化学工业 | 580篇 |
金属工艺 | 31篇 |
机械仪表 | 36篇 |
建筑科学 | 142篇 |
矿业工程 | 3篇 |
能源动力 | 29篇 |
轻工业 | 223篇 |
水利工程 | 11篇 |
石油天然气 | 5篇 |
无线电 | 120篇 |
一般工业技术 | 382篇 |
冶金工业 | 78篇 |
原子能技术 | 20篇 |
自动化技术 | 350篇 |
出版年
2023年 | 27篇 |
2022年 | 49篇 |
2021年 | 75篇 |
2020年 | 36篇 |
2019年 | 54篇 |
2018年 | 49篇 |
2017年 | 50篇 |
2016年 | 52篇 |
2015年 | 50篇 |
2014年 | 81篇 |
2013年 | 102篇 |
2012年 | 96篇 |
2011年 | 162篇 |
2010年 | 104篇 |
2009年 | 118篇 |
2008年 | 106篇 |
2007年 | 85篇 |
2006年 | 87篇 |
2005年 | 75篇 |
2004年 | 70篇 |
2003年 | 54篇 |
2002年 | 51篇 |
2001年 | 45篇 |
2000年 | 42篇 |
1999年 | 42篇 |
1998年 | 34篇 |
1997年 | 31篇 |
1996年 | 19篇 |
1995年 | 23篇 |
1994年 | 29篇 |
1993年 | 16篇 |
1992年 | 10篇 |
1991年 | 23篇 |
1990年 | 13篇 |
1989年 | 15篇 |
1988年 | 7篇 |
1987年 | 6篇 |
1986年 | 4篇 |
1985年 | 7篇 |
1984年 | 11篇 |
1983年 | 8篇 |
1980年 | 3篇 |
1978年 | 5篇 |
1977年 | 5篇 |
1976年 | 2篇 |
1974年 | 3篇 |
1972年 | 2篇 |
1967年 | 2篇 |
1966年 | 2篇 |
1931年 | 3篇 |
排序方式: 共有2052条查询结果,搜索用时 15 毫秒
1.
Dr. Vlastimil Jirasko Dr. Nils-Alexander Lakomek Dr. Susanne Penzel Dr. Marie-Laure Fogeron Prof. Dr. Ralf Bartenschlager Prof. Dr. Beat H. Meier Dr. Anja Böckmann 《Chembiochem : a European journal of chemical biology》2020,21(10):1453-1460
Proton-detected 100 kHz magic-angle-spinning (MAS) solid-state NMR is an emerging analysis method for proteins with only hundreds of microgram quantities, and thus allows structural investigation of eukaryotic membrane proteins. This is the case for the cell-free synthesized hepatitis C virus (HCV) nonstructural membrane protein 4B (NS4B). We demonstrate NS4B sample optimization using fast reconstitution schemes that enable lipid-environment screening directly by NMR. 2D spectra and relaxation properties guide the choice of the best sample preparation to record 2D 1H-detected 1H,15N and 3D 1H,13C,15N correlation experiments with linewidths and sensitivity suitable to initiate sequential assignments. Amino-acid-selectively labeled NS4B can be readily obtained using cell-free synthesis, opening the door to combinatorial labeling approaches which should enable structural studies. 相似文献
2.
Reading requires the orchestration of visual, attentional, language-related, and oculomotor processing constraints. This study replicates previous effects of frequency, predictability, and length of fixated words on fixation durations in natural reading and demonstrates new effects of these variables related to 144 sentences. Such evidence for distributed processing of words across fixation durations challenges psycholinguistic immediacy-of-processing and eye-mind assumptions. Most of the time the mind processes several words in parallel at different perceptual and cognitive levels. Eye movements can help to unravel these processes. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
3.
4.
Crystallization of Polymer-Derived Silicon Carbonitride at 1873 K under Nitrogen Overpressure 总被引:1,自引:0,他引:1
Martin Friess Joachim Bill Jerzy Golczewski re Zimmermann Fritz Aldinger Ralf Riedel Rishi Raj 《Journal of the American Ceramic Society》2002,85(10):2587-2589
The chemical stability of an amorphous silicon carbonitride ceramic, having the composition 0.57SiC·0.43Si3 N4 ·0.49C is studied as a function of nitrogen overpressure at 1873 K. The ceramic suffers a weight loss at p N2 < 3.5 bar (1 bar = 100 kPa), does not show a weight change from 3.5 to 11 bar, and gains weight above 11 bar. The structure of the ceramic changes with pressure: it is crystalline from 1 to 6 bar, amorphous at ∼10 bar, and is crystalline above ∼10 bar. The weight-loss transition, at 3.5 bar, is in excellent agreement with the prediction from thermodynamic analysis when the activities of carbon, SiC, and Si3 N4 are set equal to those of the crystalline forms; this implies that the material crystallizes before decomposition. The amorphous to crystalline transition that occurs at ∼10 bar, and which is accompanied by weight gain, is likely to have taken place by a different mechanism. A nucleation and growth reaction with the atmospheric nitrogen is proposed as the likely mechanism. The supersaturation required to nucleate α-Si3 N4 crystals is calculated to be 30 kJ/mol. 相似文献
5.
Forschung im Ingenieurwesen - Der Aufsatz beschreibt eine Möglichkeit, beliebig vermaschte Wärmenetze numerisch zu simulieren. Basierend auf einer graphentheoretischen Beschreibung der... 相似文献
6.
Markus Eisele Ralf Kolb Erwin Kraus Christian von Ehrenstein 《Informatik-Spektrum》2007,30(6):407-412
Zusammenfassung Das Schlagwort NetWeaver ist seit einiger Zeit in unserer Branche en vogue. Wie so oft, ist es nicht leicht, Marketingaspekte
vom informatischen Wesensgehalt zu unterscheiden. Dieser Beitrag m?chte hier helfen. 相似文献
7.
Reverse ray-tracing model for the performance evaluation of stationary solar concentrators 总被引:1,自引:0,他引:1
The yearly energy collection efficiency of stationary solar concentrators can be evaluated using reverse ray-tracing, and a solar radiation model. In reverse ray-tracing, rays originating at the receiver of the concentrator are traced towards the surrounding hemisphere. The method allows for the evaluation of the absolute energy collection: new concentrators may be optimized for location and tilt, requiring one-time ray-tracing. The tilt of existing concentrators is optimized. Only possible solar incidence is considered by our model. The method is fast and realistic; it can be modified for concentrators in tilt operation. 相似文献
8.
JM Chen ML Barr A Chadburn G Frizzera FA Schenkel RR Sciacca DS Reison LJ Addonizio EA Rose DM Knowles 《Canadian Metallurgical Quarterly》1993,56(3):527-538
We conducted a retrospective study of 516 cardiac recipients who underwent transplantation between April 1983 and April 1992, 19 of whom had development of post-transplantation lymphoproliferative disorders (PTLDs). These 19 patients presented with involvement of lung (5), gastrointestinal tract (5), disseminated disease (6), and adenoids and lymph nodes (3). B-cell proliferations ranging from an atypical hyperplasia to malignant lymphoma developed in 18 patients, and mixed cellularity Hodgkin's disease developed in 1 patient. The 19 patients with PTLD displayed a predominance of both women and cardiomyopathy as the indication for transplantation when compared with two separate control populations. No correlation was found between demographic criteria analyzed and (1) early versus late diagnosis of PTLD after transplantation, (2) the site of PTLD involvement, or (3) the histopathologic category of the PTLD lesion. Patients with gastrointestinal tract and lung PTLD involvement enjoyed an improved survival after both transplantation and PTLD diagnosis when compared with patients with PTLD involvement of all other extranodal sites. We report a high incidence of PTLD involving the lung and gastrointestinal tract in our cohort study. These sites of involvement responded better to a reduction in immunosuppression than did the other extranodal sites of involvement. 相似文献
9.
10.
Landgraf Ralf; Fischer Daniel; Eisenberg David 《Protein engineering, design & selection : PEDS》1999,12(11):943-951
Heregulins are members of the protein family of EGF-like growthand differentiation factors. The primary cell-surface targetsof heregulins are heterodimers of the EGF-receptor homolog HER2with either HER3 or HER4. We used a weighted evolutionary traceanalysis to identify structural features that distinguish theEGF-like domain (hrg) of heregulins from other members of theEGF family. In this analysis, each amino acid sequence is weightedaccording to its uniqueness and the variability in each positionis assigned by an amino acid substitution matrix. Conservedresidues in heregulin that are variable in other EGF-like domainsare considered possible specificity-conferring residues. Thisanalysis identifies two clusters of residues at the foot ofthe boot-shaped hrg domain. The residues in one cluster arerecruited from the N-terminus; those in the other are from the-loop region and show a weak sequence similarity to the N-terminalresidues at the opposite side of the boot. The remaining residueswith high conservation scores distribute themselves into thesetwo distinct surfaces on hrg. This pseudo-twofold symmetry andthe presence of two distinct interfaces may reflect the preferenceof hrg for heterodimeric versus homodimeric HER complexes. 相似文献