全文获取类型
收费全文 | 2763篇 |
免费 | 64篇 |
国内免费 | 4篇 |
专业分类
电工技术 | 67篇 |
综合类 | 8篇 |
化学工业 | 567篇 |
金属工艺 | 75篇 |
机械仪表 | 40篇 |
建筑科学 | 139篇 |
矿业工程 | 13篇 |
能源动力 | 32篇 |
轻工业 | 304篇 |
水利工程 | 11篇 |
石油天然气 | 7篇 |
无线电 | 194篇 |
一般工业技术 | 350篇 |
冶金工业 | 756篇 |
原子能技术 | 17篇 |
自动化技术 | 251篇 |
出版年
2019年 | 27篇 |
2018年 | 29篇 |
2017年 | 26篇 |
2016年 | 48篇 |
2015年 | 38篇 |
2014年 | 36篇 |
2013年 | 133篇 |
2012年 | 60篇 |
2011年 | 91篇 |
2010年 | 66篇 |
2009年 | 77篇 |
2008年 | 77篇 |
2007年 | 82篇 |
2006年 | 84篇 |
2005年 | 81篇 |
2004年 | 69篇 |
2003年 | 69篇 |
2002年 | 66篇 |
2001年 | 41篇 |
2000年 | 42篇 |
1999年 | 56篇 |
1998年 | 71篇 |
1997年 | 69篇 |
1996年 | 55篇 |
1995年 | 41篇 |
1994年 | 50篇 |
1993年 | 54篇 |
1992年 | 45篇 |
1991年 | 30篇 |
1990年 | 35篇 |
1989年 | 47篇 |
1988年 | 41篇 |
1987年 | 31篇 |
1986年 | 29篇 |
1985年 | 44篇 |
1984年 | 54篇 |
1983年 | 51篇 |
1982年 | 39篇 |
1981年 | 38篇 |
1980年 | 41篇 |
1979年 | 34篇 |
1978年 | 43篇 |
1977年 | 40篇 |
1976年 | 54篇 |
1975年 | 35篇 |
1974年 | 30篇 |
1973年 | 26篇 |
1972年 | 35篇 |
1971年 | 29篇 |
1966年 | 28篇 |
排序方式: 共有2831条查询结果,搜索用时 31 毫秒
61.
Rudolf Treleano Hans-Dieter Belitz Harald Jugel und Herbert Wieser 《Zeitschrift für Lebensmitteluntersuchung und -Forschung A》1978,167(5):320-323
Zusammenfassung 1-Aminocycloalkan-l-carbonsäuren mit Ringgrößen von 4–11 (ohne 10) wurden synthetisiert und auf ihre Geschmackseigenschaften untersucht. Süßer Geschmack tritt vom 4-Ring bis zum 8-Ring auf, beim 6-Ring ist der Schwellenwert minimal (c
Ssü=1–3 mmol/l). Bitter sind die Verbindungen vom 5-Ring bis zum 9-Ring, das Minimum des Schwellenwertes liegt beim 8-Ring (c
sbi=2–5 mmol/l). Die größeren Ringe sind bis zu Konzentrationen von 20 mmol/l ohne Geschmack. Beim 6-Ring löscht eine 2-Methylgruppe jeden Geschmackseindruck, während die 3- und 4-Methylverbindungen süß und bitter sind. Die 4-Äthylverbindung ist bitter aber nicht süß, die 4-tert.-Butylverbindung ist ohne Geschmack. 1-Aminonorbornan-1-carbonsäure ist süß (c
Ssü 50 mmol/l) und bitter (c
sbi=5–7mmo1/1), wobei der Schwellenwert für bitter fast eine Zehnerpotenz kleiner ist. tert.-Leucin ist ohne Geschmack. Die Ergebnisse werden im Zusammenhang mit früheren Untersuchungen an offenkettigen Aminosäuren diskutiert und in Modelle über sterische Voraussetzungen für Geschmack eingeordnet.
Relationsships between structure and taste in amino acids with cyclic side chains
Summary 1-Aminocycloalkane-1-carboxylic acids with ring sizes of 4–11 (excluding 10) were synthesized and tested for their taste properties. The compounds with 4- to 8-membered rings are sweet, with threshold values going through a minimum for the 6-membered ring (c tsw = l-3 mM/l). The compounds with 5- to 9-membered rings are bitter. Here the threshold value reaches a minimum for the 8-membered ring (c tbi=2–5 mM/l). The larger rings are without taste up to concentrations of 20 mmol/l. With the 6-membered ring a 2-methyl group abolishes any taste impression, whereas the 3- and 4-methyl compounds are sweet and bitter. The 4-ethyl compound is bitter but not sweet, the 4-tert.-butyl compound has no taste. 1-Aminonorbornane-l-carboxylic acid is sweet (c tsw 50mM/l) and bitter (c tbi= 5–7 mM/l), withc tbi being significantly smaller thanc tsw. tert-Leucine is without taste. The results are discussed in relation to previous investigations into steric prerequisites for taste in the amino acid series.相似文献
62.
63.
1 引言礁岩潮间带遍布全球 ,而日本最为多见。潮间带生长着大量的座生生物。由于海水流速常常超过10m·s- 1,这些座生生物常常受到巨大的侧向和向上拉力 ,所以座生生物在潮间带生存的必要条件是要有强大并且耐环境侵蚀的粘接能力。仔细查看一下潮间带礁岩表面就会发现许多种永久或半永久吸附其上的生物。藤壶、牡蛎、贻贝、笠贝、管栖性多毛纲生物和海带只是其中少数的几个例子。这类生物的粘接方式之所以引起人们的兴趣 ,是因为它们的粘接策略是随机应变 ,在水下它们可以与所遇到的任何类型的硬质表面 ,例如矿物、石蜡、聚丙烯酸酯、聚… 相似文献
64.
Thomas?ZolperEmail author Zhi?Li Manfred?Jungk Andreas?Stammer Herbert?Stoegbauer Tobin?Marks Yip-Wah?Chung Qian?Wang 《Tribology Letters》2013,49(2):301-311
The molecular structures, rheological properties, and friction coefficients of several new siloxane-based polymers were studied to explore their traction characteristics. The molecular structures including branch content were established by nuclear magnetic resonance spectroscopy, while the molecular mass distributions were determined by gel permeation chromatography. Density, viscosity, elastohydrodynamic film formation, and friction were investigated over a temperature range of 303–398 K. Film thickness and friction measurements were studied under the conditions that are representative of boundary, mixed, and full-film lubrication regimes, aiming at maximizing traction performance and temperature stability by simultaneous optimization of the size and content of ring-shaped branch structures. This study provides quantitative insight into the effect of siloxane molecular structure on the tribological performance for traction drive applications such as continuously variable transmissions. 相似文献
65.
66.
Toxicity of different wheat gliadins in coeliac disease 总被引:1,自引:0,他引:1
Herbert Wieser Gudrun Springer Hans-Dieter Belitz Azaria Ashkenazi Dalia Idar 《Zeitschrift für Lebensmitteluntersuchung und -Forschung A》1982,175(5):321-326
Summary To determine the toxic effect of different gliadins on coeliac patients, which has been variably assessed in the literature, wheat prolamines (gliadin) were separated into the main fractions-, -, -, and-gliadins by chromatography on Sulfopropyl Sephadex C-50. The chemical compositions of the gliands were characterized by polyacrylamide gel electrophoresis, amino-acid analysis, determination of amide nitrogen and peptide maps.The peptide fractions B2 and B3 were isolated from the gliadins by a peptic tryptic digestion, ultrafiltration and gel filtration on Sephadex G-50.The gliadins and the peptide fractions were examined for coeliac activity by immunological tests (LIF tests) and by organ-culture tests.The results show that the peptide fractions are generally more active than their respective gliadins. The peptide fractions of all gliadins have a coeliac-specific toxic effect; their activities correlate with the chemical composition of the gliadins.
Supported by a grant from Stiftung Volkswagenwerk 相似文献
Untersuchungen von Gliadinfraktionen des Weizens auf Cöliakieaktivität
Zusammenfassung Zur Überprufung der teilweise widersprüchlichen Angaben in der Literatur über die cöliakieauslösende Wirkung einzelner Gliadinfraktionen wird Weizenprolamin (Gliadin) durch Ionenaustauschchromatographie an Sulfopropyl-Sephadex C-50 in die Hauptfraktionen-, -, - und-Gliadin aufgetrennt. Die Gliadine werden durch PAG-Elektrophorese, Aminosäureanalyse, Amid-N-Bestimmung und über die nach partieller enzymatischer Hydrolyse erhaltenen Peptidmuster in ihrer chemischen Zusammensetzung charakterisiert. Durch peptisch-tryptische Partialhydrolyse, Ultrafiltration und Gelchromatographie an Sephadex G-50 werden aus den einzelnen Gliadinen die Peptidfraktionen 132 und 133 gewonnen. Die Protein- und Peptidfraktionen werden in einem immunologischen Test (LIF-Test) bzw. in einem Organkultur-Test auf Cöliakieaktivität untersucht.Die Ergebnisse zeigen, daß die Peptidfraktionen durchweg größere Aktivität haben als die entsprechenden Proteine, und daß von den Peptidfraktionen aller Gliadine eine cöliakiespezifische Wirkung ausgeht, wobei die Aktivität mit der chemischen Zusammensetzung der Gliadine korreliert ist.
Supported by a grant from Stiftung Volkswagenwerk 相似文献
67.
While many implementations of Bayesian neural networks use large, complex hierarchical priors, in much of modern Bayesian statistics, noninformative (flat) priors are very common. This paper introduces a noninformative prior for feed-forward neural networks, describing several theoretical and practical advantages of this approach. In particular, a simpler prior allows for a simpler Markov chain Monte Carlo algorithm. Details of MCMC implementation are included. 相似文献
68.
The internal/external frame of reference (I/E) model explains a seemingly paradoxical pattern of relations between math and verbal self-concepts and corresponding measures of achievement, extends social comparison theory, and has important educational implications. In a cross-cultural study of nationally representative samples of 15-year-olds from 26 countries (total N = 55,577), I/E predictions were supported in that (a) math and verbal achievements were highly correlated, but math and verbal self-concepts were nearly uncorrelated; (b) math achievement had positive effects on math self-concept, but negative effects on verbal self-concept; and (c) verbal achievement had positive effects on verbal self-concept, but negative effects on math self-concept. Supporting the cross-cultural generalizability of predictions, multigroup structural equation models demonstrated good support for the generalizabilify of results across 26 countries participating in the Programme for International Student Assessment project sponsored by the Organisation for Economic Co-operation and Development. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
69.
This study examined how response mapping of features within single- and multiple-feature targets affects decision-based processing and attentional capacity demands. Observers judged the presence or absence of 1 or 2 target features within an object either presented alone or with distractors. Judging the presence of 2 features relative to the less discriminable of these features alone was faster (conjunction benefits) when the task-relevant features differed in discriminability and were consistently mapped to responses. Conjunction benefits were attributed to asynchronous decision priming across attended, task-relevant dimensions. A failure to find conjunction benefits for disjunctive conjunctions was attributed to increased memory demands and variable feature-response mapping for 2- versus single-feature targets. Further, attentional demands were similar between single- and 2-feature targets when response mapping, memory demands, and discriminability of the task-relevant features were equated between targets. Implications of the findings for recent attention models are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
70.