排序方式: 共有31条查询结果,搜索用时 14 毫秒
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Matej Pregelj Oksana Zaharko Andrej Zorko Matjaž Gomilšek Oles Sendetskyi Axel Günther Mykhaylo Ozerov Sergei A. Zvyagin Hubertus Luetkens Christopher Baines Vladimir Tsurkan Alois Loidl 《Advanced functional materials》2015,25(24):3634-3640
Materials with broad absorption bands are highly desirable for electromagnetic filtering and processing applications, especially if the absorption can be externally controlled. Here, a new class of broadband‐absorption materials is introduced. Namely, layered metamagnets exhibit an electromagnetic excitation continuum in the magnetic‐field‐induced mixed ferro‐ and antiferromagnetic phase. Employing a series of complementary experimental techniques involving neutron scattering, muon spin relaxation, specific heat, ac and dc magnetization measurements, and electron magnetic resonance, a detailed magnetic phase diagram of Cu3Bi(SeO3)2O2Br is determined and it is found that the excitations in the mixed phase extend over at least ten decades of frequency. The results, which reveal a new dynamical aspect of the mixed phase in metamagnets, open up a novel approach to controllable microwave filtering. 相似文献
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An effective metal-cutting tool is usually a combination of a hard coating and a tough substrate. The successful deposition
of diamond outside its thermodynamic stability range has stimulated the development of a new class of cutting tools: those
with diamond-coated inserts of any desired style and edge geometry. The successful implementation of diamond coatings also
expedited similar research in the deposition of cubic boron nitride. This paper presents superhard coating tools, with emphasis
on diamond-coated WC-Co tools, the corresponding deposition of technologies and the foreseen metal-cutting applications. 相似文献
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Authenticity Assessment of Extra Virgin Olive Oil: Evaluation of Desmethylsterols and Triterpene Dialcohols 下载免费PDF全文
Cynthia T. Srigley Carolyn J. Oles Ali Reza Fardin Kia Magdi M. Mossoba 《Journal of the American Oil Chemists' Society》2016,93(2):171-181
Extra virgin olive oil (EVOO) has a long history of economic adulteration, the detection of which presents significant challenges due to the diverse composition of cultivars grown around the world and the limitations of existing methods for detecting adulteration. In this study, using Method COI/T.20/Doc. No. 30/Rev. 1 of the International Olive Council, the authenticity of 88 market samples of EVOO was evaluated by comparing total sterol contents, desmethylsterol composition, and contents of triterpene dialcohols (erythrodiol and uvaol) with purity criteria specified in the United States Standards for grades of olive oil and olive‐pomace oil. Three of the 88 samples labeled as EVOO failed to meet purity criteria, indicating possible adulteration with commodity oil and/or solvent‐extracted olive oil. Detection of adulteration was also evaluated by spiking an EVOO sample with commodity oil at the 10 % level. As expected, eight of the spiked samples (canola, corn, hazelnut, peanut, safflower, soybean, and sunflower oils, and palm olein) failed to meet purity criteria. Two of the three samples spiked with 10 % hazelnut oil went undetected for adulteration. Overall, a low occurrence rate of adulteration (<5 %), based on purity criteria for desmethylsterols and triterpene dialcohols, was detected for the 88 products labeled as EVOO. 相似文献
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