全文获取类型
收费全文 | 175篇 |
免费 | 1篇 |
专业分类
化学 | 158篇 |
晶体学 | 1篇 |
力学 | 2篇 |
数学 | 1篇 |
物理学 | 14篇 |
出版年
2020年 | 3篇 |
2016年 | 1篇 |
2015年 | 2篇 |
2014年 | 1篇 |
2012年 | 3篇 |
2010年 | 3篇 |
2009年 | 3篇 |
2008年 | 5篇 |
2007年 | 8篇 |
2006年 | 5篇 |
2005年 | 8篇 |
2004年 | 8篇 |
2003年 | 4篇 |
2002年 | 4篇 |
2001年 | 15篇 |
2000年 | 3篇 |
1999年 | 3篇 |
1998年 | 8篇 |
1994年 | 1篇 |
1991年 | 1篇 |
1989年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1981年 | 1篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1970年 | 1篇 |
1967年 | 1篇 |
1933年 | 2篇 |
1930年 | 7篇 |
1928年 | 2篇 |
1923年 | 14篇 |
1922年 | 2篇 |
1921年 | 2篇 |
1918年 | 12篇 |
1915年 | 1篇 |
1906年 | 2篇 |
1904年 | 2篇 |
1898年 | 2篇 |
1897年 | 7篇 |
1896年 | 1篇 |
1895年 | 1篇 |
1894年 | 3篇 |
1893年 | 1篇 |
1892年 | 1篇 |
1891年 | 11篇 |
1890年 | 3篇 |
1887年 | 2篇 |
1883年 | 1篇 |
排序方式: 共有176条查询结果,搜索用时 15 毫秒
1.
An alternative method for stability testing of candidate certified reference materials (CRMs) utilizing “isochronous” measurements based on a storage design (storing samples at different temperatures for different time periods), which allows all measurements to be done at the same time, i.e. at the end of the study, is compared to “classical” designs of stability studies using reference time or reference temperature. The execution of stability studies using “isochronous” measurements only requires repeatability conditions, whereas classical designs require both repeatability and long term reproducibility conditions. Consequently, the new design allows the quality of results to be improved. 相似文献
2.
3.
4.
5.
Advances in wide bandgap SiC for optoelectronics 总被引:1,自引:0,他引:1
Haiyan Ou Yiyu Ou Aikaterini Argyraki Saskia Schimmel Michl Kaiser Peter Wellmann Margareta K. Linnarsson Valdas Jokubavicius Jianwu Sun Rickard Liljedahl Mikael Syväjärvi 《The European Physical Journal B - Condensed Matter and Complex Systems》2014,87(3):1-16
Silicon carbide (SiC) has played a key role in power electronics thanks to its unique physical properties like wide bandgap, high breakdown field, etc. During the past decade, SiC is also becoming more and more active in optoelectronics thanks to the progress in materials growth and nanofabrication. This paper will review the advances in fluorescent SiC for white light-emitting diodes, covering the poly-crystalline doped SiC source material growth, single crystalline epitaxy growth of fluorescent SiC, and nanofabrication of SiC to enhance the extraction efficiency for fluorescent SiC based white LEDs. 相似文献
6.
7.
Ohne Zusammenfassung 相似文献
8.
9.
Wolfgang J. Philipp Pierre van Iwaarden Heinz Schimmel Nele Meeus Nadine Kollmorgen 《Accreditation and quality assurance》2007,12(3-4):134-138
The reliability of reference materials (RMs) depends on properties such as fitness, robustness, commutability, stability and
homogeneity. The development of RMs for microbiological analysis is especially challenged through questions around the stabilisation
and recovery of viable cells, the dispersion of precise numbers of cells, matrix effects and, when using molecular techniques,
the presence of nucleic acids (e.g. DNA) of dead and live target organisms. However, RMs are indispensable tools for quality
control in microbiological analysis. The Institute for Reference Materials and Measurements (IRMM), as part of the European
Commission, concentrates its efforts on the development of RMs to support the development, implementation and monitoring of
EU legislation. A special focus is given to highly precise RMs for presence/absence and enumeration tests in microbiological
food and water analysis. Another group of new RMs certified by the IRMM comprise DNA-based materials to control the identity
of micro-organisms in qualitative assays. All of these activities serve to improve quality control in microbiological analysis.
Presented at ‘BERM-10’, April 2006, Charleston, SC, USA. 相似文献
10.