全文获取类型
收费全文 | 274篇 |
免费 | 26篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 2篇 |
化学工业 | 106篇 |
金属工艺 | 6篇 |
机械仪表 | 3篇 |
建筑科学 | 5篇 |
能源动力 | 16篇 |
轻工业 | 58篇 |
石油天然气 | 1篇 |
无线电 | 12篇 |
一般工业技术 | 38篇 |
冶金工业 | 25篇 |
原子能技术 | 1篇 |
自动化技术 | 28篇 |
出版年
2024年 | 1篇 |
2023年 | 1篇 |
2022年 | 15篇 |
2021年 | 29篇 |
2020年 | 23篇 |
2019年 | 7篇 |
2018年 | 6篇 |
2017年 | 16篇 |
2016年 | 20篇 |
2015年 | 13篇 |
2014年 | 9篇 |
2013年 | 14篇 |
2012年 | 14篇 |
2011年 | 18篇 |
2010年 | 18篇 |
2009年 | 12篇 |
2008年 | 16篇 |
2007年 | 7篇 |
2006年 | 7篇 |
2005年 | 6篇 |
2004年 | 5篇 |
2003年 | 5篇 |
2002年 | 5篇 |
2001年 | 3篇 |
2000年 | 3篇 |
1999年 | 2篇 |
1998年 | 7篇 |
1997年 | 1篇 |
1996年 | 4篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1987年 | 3篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有301条查询结果,搜索用时 258 毫秒
51.
52.
Vendula Pachlová František Buňka Leona Buňková Sabina Purkrtová Šárka Havlíková Irena Němečková 《International Journal of Dairy Technology》2016,69(3):386-392
The aim of this work was to study the biogenic amine content of brine‐ripened cheeses after one year of storage and then to investigate possible contaminating micro‐organisms with decarboxylase activity. The biogenic amine production of isolates was tested in vitro. The most frequent biogenic amines were putrescine, histamine and tyramine. The biogenic amine content detected in one cheese sample was above 120 mg/kg; this can be considered toxicologically relevant. Decarboxylase activity was found for 33 contaminating micro‐organisms. Isolates belonging to Bacillus licheniformis, Debaryomyces hansenii, Staphylococcus equorum and Serratia marcescens produced significant amounts of putrescine and cadaverine. 相似文献
53.
Edwin Yesid Gómez-Pachón Francisco Manuel Sánchez-Arévalo Federico J. Sabina Alfredo Maciel-Cerda Raúl Montiel Campos Nikola Batina Israel Morales-Reyes Ricardo Vera-Graziano 《Journal of Materials Science》2013,48(23):8308-8319
The aim of this study is to predict the elastic response of poly(lactic acid) (PLA) electrospun nanofibre scaffolds through mathematical models based on homogenisation and the differential replacement method (DRM). These models principally seek to determine and analyse the effects of the internal morphology of the nanofibres on the effective Young’s modulus of polymer nanofibre scaffolds. The microstructure of the nanofibres was first characterised by SEM, XRD, DSC, AFM, and TEM techniques. From this characterisation, strong evidence of a hierarchical core–shell structure was found. With the experimental data, it was possible to design and validate better models than those currently used. In addition, the effects of the electrospinning parameters, such as take-up velocity and thermal treatment, were analysed and correlated with the morphology and the elastic properties of the nanofibres and their scaffolds. To validate the models’ results, we conducted a series of uniaxial tensile tests on the PLA nanofibre scaffolds. Using the data from the nanofibre measurements, the homogenisation approximations and the model based on the DRM predicted an effective Young’s modulus of 667 and 835 MPa, respectively. The predicted data were in excellent agreement with the experimental results (685–880 MPa). These models will be useful in understanding and evaluating the structure–property relationships of oriented nanofibre scaffolds for medical or biological applications. 相似文献
54.
The lateral mobility of the thiolate ligands on the surface of Au nanoparticles was probed by EPR spectroscopy. This was achieved by using bisnitroxide ligands, which contained a disulfide group (to ensure attachment to the Au surface) and a cleavable ester bridge connecting the two spin-labeled branches of the molecule. Upon adsorption of these ligands on the surface of Au nanoparticles, the two spin-labeled branches were held next to each other by the ester bridge as evidenced by the spin-spin interactions. Cleavage of the bridge removed the link that kept the branches together. CW and pulsed EPR (DEER) experiments showed that the average distance between the adjacent thiolate branches on the Au nanoparticle surface only marginally increased after cleaving the bridge and thermal treatment. This implies that the lateral diffusion of thiolate ligands on the nanoparticle surface is very slow at room temperature and takes hours even at elevated temperatures (90 degrees C). The changes in the distance distribution observed at high temperature are likely due to ligands hopping between the nanoparticles rather than diffusing on the particle surface. 相似文献
55.
Ming-Yu Li Yusuke Hirono Sabina D Koukourinkova Mao Sui Sangmin Song Eun-Soo Kim Jihoon Lee Gregory J Salamo 《Nanoscale research letters》2012,7(1):550
In this paper, the formation of Ga droplets on photo-lithographically patterned GaAs (100) and the control of the size and density of Ga droplets by droplet epitaxy using molecular beam epitaxy are demonstrated. In extension of our previous result from the journal Physical Status Solidi A, volume 209 in 2012, the sharp contrast of the size and density of Ga droplets is clearly observed by high-resolution scanning electron microscope, atomic force microscope, and energy dispersive X-ray spectrometry. Also, additional monolayer (ML) coverage is added to strength the result. The density of droplets is an order of magnitude higher on the trench area (etched area), while the size of droplets is much larger on the strip top area (un-etched area). A systematic variation of ML coverage results in an establishment of the control of size and density of Ga droplets. The cross-sectional line profile analysis and root mean square roughness analysis show that the trench area (etched area) is approximately six times rougher. The atomic surface roughness is suggested to be the main cause of the sharp contrast of the size and density of Ga droplets and is discussed in terms of surface diffusion. 相似文献
56.
Magdalen Zlatanov Ginka Antova Maria Angelova-Romova Svetlana Momchilova Sabina Taneva Boryana Nikolova-Damyanova 《Journal of the American Oil Chemists' Society》2012,89(8):1393-1401
The lipid composition of the seed oil of three varieties (L-74, VIR-11 and BGR-455) of Lallemantia iberica Fisch. &; Mey. (Lamiaceae) harvested in Bulgaria was examined in detail. Triacylglycerols (TAG >90%), phospholipids (<3%), sterol esters (~0.2%), and accompanying compounds—sterols (~0.3%) and tocopherols (336–499 mg/kg)—were determined for the first time. In addition, the specific distribution of fatty acids between the lipid classes was elucidated. Nineteen TAG species were unambiguously identified and quantified and of these the highly unsaturated trilinolenin, dilinolenyl linoleate and dilinolenyl palmitate comprised 59% of the total TAG. Phosphatidylcholine, phosphatidylinositol and phosphatidylethanolamine were the main phospholipids. Beta-sitosterol was the main sterol component, followed by campesterol and stigmasterol. Gamma-tocopherol predominated (>90%) in the tocopherol fraction. Palmitic acid (16:0) was the major fatty acid of the phospholipids and oleic acid (cis 9-18:1) dominated in the sterol ester fraction. The three varieties have similar lipid compositions with BGR-455 being slightly more saturated. Due to its composition, Lallemantia oil might compete successfully with flax and other plant oils as a source of linolenic fatty acid in industrial and dietary applications. 相似文献
57.
58.
Cui En-Ji Song Na-Young Shrestha Sabina Chung In-Sik Kim Ji-Young Jeong Tae-Sook Baek Nam-In 《Food science and biotechnology》2012,21(2):619-624
Six flavonoid glycosides were isolated from the n-butanol fraction of cowpea seeds (Vigna sinensis K.) through silica gel (SiO2) and octadecyl silica gel (ODS) column chromatographies. Based on their chemical structures determined via interpretation
of spectroscopic data including NMR, MS, and IR, the compounds were identified as kaempferol 3-O-β-d-sophoroside (1), quercetin 3-O-β-d-sophoroside (2), isoquercitrin (3), hyperin (4), catechin 7-O-β-d-glucopyranoside (5), and quercetin 3-O-β-Dglucopyranosyl( 1→6)-O-β-d-galactopyranoside (6). This is the first report of the isolation of these flavonoids from this plant. Among these flavonoids, compound 2, 5, and 6 significantly inhibited LDL oxidation exhibiting 96.0±0.1 (IC50: 3.9 μM), 96.8±1.7 (IC50: 2.9 μM), and 97.4±0.1% (IC50: 3.5 μM) inhibition, respectively, at a concentration of 40 μM. 相似文献
59.
?ehaji?-Clancy Sabina; Effron Daniel A.; Halperin Eran; Liberman Varda; Ross Lee D. 《Canadian Metallurgical Quarterly》2011,101(2):256
Three studies, 2 conducted in Israel and 1 conducted in Bosnia and Herzegovina, demonstrated that affirming a positive aspect of the self can increase one's willingness to acknowledge in-group responsibility for wrongdoing against others, express feelings of group-based guilt, and consequently provide greater support for reparation policies. By contrast, affirming one's group, although similarly boosting feelings of pride, failed to increase willingness to acknowledge and redress in-group wrongdoing. Studies 2 and 3 demonstrated the mediating role of group-based guilt. That is, increased acknowledgment of in-group responsibility for out-group victimization produced increased feelings of guilt, which in turn increased support for reparation policies to the victimized group. Theoretical and applied implications are discussed. (PsycINFO Database Record (c) 2011 APA, all rights reserved) 相似文献
60.
Sabina Nielsen 《Management International Review》2010,50(2):185-206