全文获取类型
收费全文 | 118篇 |
免费 | 1篇 |
专业分类
化学 | 77篇 |
晶体学 | 3篇 |
力学 | 1篇 |
数学 | 7篇 |
物理学 | 31篇 |
出版年
2022年 | 3篇 |
2021年 | 2篇 |
2020年 | 5篇 |
2019年 | 2篇 |
2018年 | 5篇 |
2017年 | 3篇 |
2016年 | 3篇 |
2015年 | 3篇 |
2014年 | 4篇 |
2013年 | 7篇 |
2012年 | 4篇 |
2011年 | 7篇 |
2010年 | 11篇 |
2009年 | 5篇 |
2008年 | 5篇 |
2007年 | 5篇 |
2006年 | 6篇 |
2005年 | 4篇 |
2004年 | 6篇 |
2003年 | 3篇 |
2002年 | 4篇 |
2001年 | 3篇 |
2000年 | 6篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1989年 | 2篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1980年 | 1篇 |
排序方式: 共有119条查询结果,搜索用时 250 毫秒
51.
An iron‐containing mesoporous molecular sieve, or Fe‐MCM‐41, was successfully synthesized the via sol–gel technique using silatrane and FeCl3 as the silicon and iron sources, and was characterized using various techniques. Many factors were investigated, namely, reaction temperature and time, calcination rate, and iron amount in the reaction mixture. It was found that the optimum conditions in which to synthesize Fe‐MCM‐41 was to carry out the reaction at 60 °C for 7 h using a 1 °C min?1 calcination rate and a 550 °C calcination temperature. The catalytic activity and selectivity of styrene epoxidation using hydrogen peroxide showed that the selectivity of the styrene oxide reached 65% at a styrene conversion of 22% over the 1%wt catalyst. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
52.
53.
Krupyanskii Yu. F. Esin S. V. Eshenko G. V. Mikhailyuk M. G. 《Hyperfine Interactions》2002,141(1-4):273-277
Hyperfine Interactions - The angular dependencies of inelastic intensities of Rayleigh scattering of Mössbauer radiation were measured for lysozyme and myoglobin (for different degrees of... 相似文献
54.
The technologies enabling the creation of large scale, miniaturized peptide or protein microarrays are emerging. The focuses of this review are the synthesis and applications of peptide and peptidomimetic microarrays, especially the light directed parallel synthesis of individually addressable high density peptide microarrays using a novel photogenerated reagent chemistry and digital photolithography (Gao et al., 1998, J. Am. Chem. Soc. 120, 12698; Pellois et al. 2002, Nat. Biotechnol. 20, 922). Concepts related to the synthesis are discussed, such as the reactions of photogenerated acids in the deprotection step of peptide synthesis or oligonucleotide synthesis, and the applications of high density peptide chips in antibody binding assays are discussed. Peptide chips provide versatile tools for probing antigen-antibody, protein-protein, peptide-ligand interactions and are basic components for miniaturization, automation, and system integration in research and clinical diagnosis applications. 相似文献
55.
56.
N. S. Bredov Le Phu Soan V. V. Kireev A. A. Bykovskaya I. B. Sokol’skaya M. V. Gorlov A. S. Esin S. R. Bekmukhamedova V. A. Polyakov 《Polymer Science Series B》2017,59(3):240-247
Methacrylate-containing oligosilsesquioxanes with a molecular mass of 700–4000 are synthesized via the acidic hydrolytic polycondensation of γ-methacryloxy-propyltrimethoxysilane (A-174) in the medium of methyl methacrylate or in a mixture of bis(methacrylates). The structure of the oligomers is studied by 1Н and 29Si NMR spectroscopy and MALDI-TOF mass spectrometry. 相似文献
57.
Selin Çelebi Esin İbibikcan Senem Kiralp Kayahan Başak Yiĝitsoy Levent Toppare 《高分子科学杂志,A辑:纯化学与应用化学》2013,50(8):739-744
Immobilization of invertase in conducting copolymer matrix of 2,5-di(thiophen-2-yl)-1-p-tolyl-1H-pyrrole with pyrrole (poly(DDTP-co-Py)) was achieved via electrochemical polymerization. Kinetic parameters, Michaelis-Menten constant, Km and the maximum reaction rate, Vmax were investigated. Operational stability and temperature optimization of the enzyme electrodes were also examined. Immobilized invertase reveals maximum activity at 50°C and; pH 8 and pH 4 for two copolymer matrices. Although the same two monomers are utilized for the copolymer synthesis, the way the copolymer is produced results in quite different responses in terms of enzyme activity, optimum pH and kinetic parameters. Excellent operational stability of the enzyme electrodes enables their repetitive use in the determination of invert sugar. 相似文献
58.
59.
Stedtfeld RD Tourlousse DM Seyrig G Stedtfeld TM Kronlein M Price S Ahmad F Gulari E Tiedje JM Hashsham SA 《Lab on a chip》2012,12(8):1454-1462
By 2012, point of care (POC) testing will constitute roughly one third of the $59 billion in vitro diagnostics market. The ability to carry out multiplexed genetic testing and wireless connectivity are emerging as key attributes of future POC devices. In this study, an inexpensive, user-friendly and compact device (termed Gene-Z) is presented for rapid quantitative detection of multiple genetic markers with high sensitivity and specificity. Using a disposable valve-less polymer microfluidic chip containing four arrays of 15 reaction wells each with dehydrated primers for isothermal amplification, the Gene-Z enables simultaneous analysis of four samples, each for multiple genetic markers in parallel, requiring only a single pipetting step per sample for dispensing. To drastically reduce the cost and size of the real-time detector necessary for quantification, loop-mediated isothermal amplification (LAMP) was performed with a high concentration of SYTO-81, a non-inhibiting fluorescent DNA binding dye. The Gene-Z is operated using an iPod Touch, which also receives data and carries out automated analysis and reporting via a WiFi interface. This study presents data pertaining to performance of the device including sensitivity and reproducibility using genomic DNA from Escherichia coli and Staphylococcus aureus. Overall, the Gene-Z represents a significant step toward truly inexpensive and compact tools for POC genetic testing. 相似文献
60.
Hasan?Erdem??amurluEmail author ?mer?Kesmez Esin?Burunkaya Nadir?Kiraz Zerin?Ye?il Meltem?Asiltürk Ertu?rul?Arpa? 《Chemical Papers》2012,66(5):461-471
Self-cleaning photocatalytic TiO2 films are beneficial since they reduce the maintenance cost and enhance the efficiency of various optical systems, especially
thermal and photovoltaic solar systems. However, the presence of a TiO2 layer on glass reduces the transmission of incident light, which leads to a decrease in efficiency. This drawback can be
overcome by applying a layer of anti-reflective coating beneath the TiO2 layer. Generally, the anti-reflective layer is porous silica. The presence of the anti-reflective layer compensates for the
loss of light transmittance caused by the photocatalytic TiO2 top layer. This paper reviews some of the previous and the latest fundamental studies in the literature on anti-reflective,
self-cleaning and multi-functional films. 相似文献