全文获取类型
收费全文 | 7030篇 |
免费 | 391篇 |
国内免费 | 98篇 |
专业分类
电工技术 | 19篇 |
综合类 | 353篇 |
化学工业 | 3232篇 |
金属工艺 | 55篇 |
机械仪表 | 60篇 |
建筑科学 | 96篇 |
矿业工程 | 27篇 |
能源动力 | 157篇 |
轻工业 | 1624篇 |
水利工程 | 7篇 |
石油天然气 | 424篇 |
武器工业 | 5篇 |
无线电 | 109篇 |
一般工业技术 | 552篇 |
冶金工业 | 723篇 |
原子能技术 | 20篇 |
自动化技术 | 56篇 |
出版年
2024年 | 37篇 |
2023年 | 96篇 |
2022年 | 133篇 |
2021年 | 187篇 |
2020年 | 171篇 |
2019年 | 164篇 |
2018年 | 119篇 |
2017年 | 180篇 |
2016年 | 191篇 |
2015年 | 183篇 |
2014年 | 293篇 |
2013年 | 318篇 |
2012年 | 427篇 |
2011年 | 479篇 |
2010年 | 341篇 |
2009年 | 388篇 |
2008年 | 345篇 |
2007年 | 471篇 |
2006年 | 486篇 |
2005年 | 386篇 |
2004年 | 364篇 |
2003年 | 308篇 |
2002年 | 277篇 |
2001年 | 228篇 |
2000年 | 161篇 |
1999年 | 160篇 |
1998年 | 112篇 |
1997年 | 100篇 |
1996年 | 60篇 |
1995年 | 61篇 |
1994年 | 50篇 |
1993年 | 34篇 |
1992年 | 37篇 |
1991年 | 26篇 |
1990年 | 30篇 |
1989年 | 19篇 |
1988年 | 20篇 |
1987年 | 15篇 |
1986年 | 12篇 |
1985年 | 8篇 |
1984年 | 5篇 |
1983年 | 5篇 |
1982年 | 3篇 |
1979年 | 3篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1974年 | 3篇 |
1968年 | 2篇 |
1964年 | 2篇 |
1951年 | 4篇 |
排序方式: 共有7519条查询结果,搜索用时 15 毫秒
1.
《International Journal of Hydrogen Energy》2022,47(44):19217-19236
In our previous work, phosphorylated chitosan was modified through polymer blending with poly(vinyl alcohol) (PVA) polymer to produce N-methylene phosphonic chitosan/poly(vinyl alcohol) (NMPC/PVA) composite membranes. The aim of this work is to further investigate the effects of a propylammonium nitrate (PAN) ionic liquid and/or silicon dioxide (SiO2) filler on the morphology and physical properties of NMPC/PVA composite membranes. The temperature-dependent ionic conductivity of the composite membranes with various ionic liquid and filler compositions was studied by varying the loading of PAN ionic liquid and SiO2-PAN filler in the range of 5–20 wt%. As the loading of PAN ionic liquid increased in the NMPC/PVA membrane matrix, the ionic conductivity value also increased with the highest value of 0.53 × 10?3 S cm?1 at 25 °C and increased to 1.54 × 10?3 S cm?1 at 100 °C with 20 wt% PAN. The NMPC/PVA-PAN (20 wt%) composite membrane also exhibited the highest water uptake and ion exchange capacity, with values of 60.5% and 0.60 mequiv g?1, respectively. In addition, in the single-cell performance test, the NMPC/PVA-PAN (20 wt%) composite membrane displayed a maximum power density, which was increased by approximately 14% compared to the NMPC/PVA composite membrane with 5 wt% SiO2-PAN. This work demonstrated that modified NMPC/PVA composite membranes with ionic liquid PAN and/or SiO2 filler showed enhanced performance compared with unmodified NMPC/PVA composite membranes for proton exchange membrane fuel cells. 相似文献
2.
Dr. Timo Broese Dr. Peter Ehlers Dr. Peter Langer Dr. Jan von Langermann 《Chembiochem : a European journal of chemical biology》2021,22(23):3314-3318
Fluoro-substituted and heteroaromatic compounds are valuable intermediates for a variety of applications in pharma- and agrochemistry and synthetic chemistry. This study investigates the chemoenzymatic preparation of chiral alcohols bearing a heteroaromatic ring with an increasing degree of fluorination in α-position. Starting from readily available picoline derivatives prochiral α-halogenated acyl moieties were introduced with excellent selectivity and 64–95 % yield. The formed carbonyl group was subsequently reduced to the corresponding alcohols using the alcohol dehydrogenase from Lactobacillus kefir, yielding an enantiomeric excess of 95–>99 % and up to 98 % yield. 相似文献
3.
4.
5.
以丙烯腈和苯甲醇为原料,浓硫酸作催化剂,合成了N-苄基丙烯酰胺(N-BAA)。考察了反应温度、反应时间和催化剂用量等因素对产物收率的影响,得出了最佳反应条件:n(丙烯腈):n(苯甲醇):n(浓硫酸)=3:1:1.2,反应时间3h,反应温度60℃。在最佳条件下,N-BAA的收率可达92%。每100g粗产物用10%氢氧化钠溶液提纯,精制产物纯度可达99.80%,熔点为64~65℃。通过红外光谱对产物结构进行了表征。 相似文献
6.
提出了以主氯酸为催化剂,分析纯乙酸乙酯为介质,乙酸化法测定伯、仲醇的实验条件,实现了对经典方法的改进,简化了操作程序。 相似文献
7.
Poly(vinyl alcohol) is crosslinked in dilute solution (c=0.1 wt%) with glutaraldehyde. The reaction product is characterized by viscometry and gel permeation chromatography (g.p.c.). The intrinsic viscosity decreases with increasing degree of crosslinking and does not depend on temperature. G.p.c. reveals that the reaction product is not homogeneous, but consists of a mixture of particles with different sizes, possibly both intra- and intermolecularly crosslinked molecules. The intramolecularly crosslinked molecules are smaller in size than the initial polymer molecules and their size depends on the degree of crosslinking. They possess a narrow particle size distribution even if the initial polymer sample had a broad molecular weight distribution. 相似文献
8.
Temperature and pH‐responsive interpenetrating polymer network (IPN) hydrogels, constructed with poly(methacrylic acid) (PMAA) and poly(vinyl alcohol) (PVA), by a sequential IPN method, were studied. The characterization of IPN hydrogels was investigated by Fourier‐transform infrared spectroscopy, differential scanning calorimetry (DSC) and swelling under various conditions. The IPN hydrogels exhibited relatively high swelling ratios, in the range 230–380 %, at 25 °C. The swelling ratios of the PMAA/PVA IPN hydrogels were pH and temperature dependent. DSC was used for the quantitative determination of the amounts of freezing and non‐freezing water. The amount of free water increased with increasing PMAA content in the IPN hydrogels. Copyright © 2004 Society of Chemical Industry 相似文献
9.
Kahler Christopher W.; Read Jennifer P.; Wood Mark D.; Palfai Tibor P. 《Canadian Metallurgical Quarterly》2003,17(3):226
Structural equation modeling was used to test the mediational role of social environmental selection on alcohol use in cross-sectional samples of 447 students from a rural state university and 421 students from an urban private university. Results showed that male gender, White ethnicity, and sensation seeking were uniquely associated with greater alcohol use. Mediational analyses indicated that socioenvironmental factors (i.e., Greek involvement, friends' approval of drinking/getting drunk) were positively associated with alcohol use and significantly accounted for parts of the effects of ethnicity and sensation seeking, but not gender, on alcohol use. Results suggest that White students and those high on sensation seeking may drink more heavily in college, in part because they select social environments in which alcohol use is encouraged. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
10.
The present study explores the relation among 4 personality traits associated with impulsive behavior and alcohol abuse. Personality traits were measured using the 4 subscales of the UPPS Impulsive Behavior Scale (UPPS: S. P. Whiteside & D. R. Lynam. 2001). The UPPS and measures of psychopathology were administered to clinical samples of alcohol abusers high in antisocial personality traits (AAPD), alcohol abusers low in antisocial personality traits (AA), and a control group (total N = 60). Separate analyses of variance indicated that AAPDs had significant elevations on all 4 UPPS scales, whereas the AAs and controls differed only on the Urgency subscale. However, when controlling for psychopathology, group differences on the UPPS scales disappeared. The results suggest that personality traits related to impulsive behavior are not directly related to alcohol abuse but rather are associated with the elevated levels of psychopathology found in a subtype of alcohol abusers. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献