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排序方式: 共有1062条查询结果,搜索用时 31 毫秒
51.
Nina Radić Bratislav M. Obradović Mirjana Kostić Biljana Dojčinović Milorad M. Kuraica Mirko Černák 《Surface & coatings technology》2012
The aim of this work is plasma activation of nonwoven polypropylene (PP) using two different ambient air plasma sources: volume dielectric barrier discharge (DBD) and diffuse coplanar surface barrier discharge (DCSBD) and its functionalization by silver ion deposition. 相似文献
52.
<正>本刊讯6月10日上午,景德镇陶瓷学院材料科学与工程学院第四届"宏宇奖助学金颁奖仪式"在景德镇陶瓷学院(湘湖校区)图书馆报告厅举行,广东宏宇集团副总经理欧家瑞、市场总监王勇,景德镇陶瓷学院院长江伟辉教授、校党委学工部部长王海波、教务处副处长吴晟、团委副书记常成玉、材料学 相似文献
53.
Nina Hammer Karina Mathisen Tina Zscherpe De Chen Magnus R?nning 《Topics in Catalysis》2011,54(13-15):922-930
The impact of thermal treatment at various preparation stages of carbon supported Au/TiO2 catalysts prior to oxidation of CO in the presence and absence of hydrogen was studied. An increase in catalytic activity for thermally treated samples due to a more ordered structure of TiO2 was observed. A reversible deactivation of the catalysts occurred in the absence of hydrogen. However, the activity was restored at preferential CO oxidation conditions in presence of hydrogen. 相似文献
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55.
Nina Martinez Adrienne Boire Lisa M. DeAngelis 《International journal of molecular sciences》2013,14(8):17157-17167
Brain metastases are a much-feared complication of cancer. The development of brain metastases requires a malignant cell to acquire characteristics that facilitate dissemination away from the primary site, entrance into the nervous system, and establishment in the brain. This review summarizes recent work focused on the molecular derangements leading to brain metastases and outlines areas in need of greater understanding. 相似文献
56.
Bond Kenneth; Ospina Maria B.; Hooton Nicola; Bialy Liza; Dryden Donna M.; Buscemi Nina; Shannahoff-Khalsa David; Dusek Jeffrey; Carlson Linda E. 《Canadian Metallurgical Quarterly》2009,1(2):129
The authors used a 5-round Delphi study with a panel of 7 experts in meditation research to achieve agreement on a set of criteria for a working definition of “meditation” for use in a comprehensive systematic review of the therapeutic use of meditation. Participants agreed that essential to a meditation practice is its use of (a) a defined technique, (b) logic relaxation, and (c) a self-induced state. Participants also agreed that a meditation practice may (d) involve a state of psychophysical relaxation somewhere in the process; (e) use a self-focus skill or anchor; (f) involve an altered state/mode of consciousness, mystic experience, enlightenment or suspension of logical thought processes; (g) be embedded in a religious/spiritual/philosophical context; or (h) involve an experience of mental silence. The results of this study provide insight into the challenges faced by researchers who want to demarcate meditative practices from nonmeditative practices, and they describe an approach to this problem that may prove useful for researchers trying to operationalize meditation in the context of comparative research. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
57.
Robert Hrastar Ling‐Zhi Cheong Xuebing Xu Charlotte Jacobsen Nina Skall Nielsen Rasmus Leth Miller Iztok Jože Košir 《European Journal of Lipid Science and Technology》2011,113(4):513-521
Camelina sativa oil (CO) is characterized by a high content (up to 40 wt %) of essential α‐linolenic acid and characteristic odour and flavour. Deodorization of highly unsaturated oils requires great attention as the refining process involves thermal treatment which affects oil integrity. In the present study RSM and principal component analysis (PCA) were used to optimize bench‐scale deodorization of CO. Mathematical models were generated through multiple regressions with backward elimination, describing the effects of process parameters (temperature, steam flow, time) on oil quality indicators [peroxide value (PV), p‐anisidine value (p‐AV), γ‐tocopherol (γ‐T) and oxidative stability (OS)]. Additionally, sensory evaluation was performed. RSM analysis showed a significant effect of deodorization temperature and to a lesser extent, deodorization steam flow and time on removal of oxidative compounds, flavour and odour. PCA of chemical and sensory results showed that deodorization temperature affected the sensory properties in the samples. The best conditions for removing undesirable flavour and odour were achieved by using a deodorization temperature of 195–210°C. 相似文献
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59.
Matej Baláž Anna Zorkovská Javier S. Blazquez Nina Daneu Peter Baláž 《Journal of Materials Science》2017,52(20):11947-11961
Covellite, CuS and chalcocite, Cu2S nanoparticles prepared in the explosive manner from elemental precursors were further ball-milled in order to observe additional changes caused by mechanical action. Three phases of chalcocite were interchanging during milling, monoclinic one being major at the equilibrium after 30 min. In the case of covellite synthesis, milling for 15 min brought about a significant diminishment in the content of digenite, Cu1.8S, impurity. Covellite powder exhibited finer character than chalcocite, as documented by crystallite size, grain size and specific surface area analysis. Finally, the effect of milling speed on the explosive character of the reaction and phase composition of chalcocite was investigated. The most drastic conditions favored the formation of the monoclinic phase with the lowest symmetry and the time and intensity of the explosion was found to depend on the milling speed. The whole process is mechanically driven. 相似文献
60.
本文阐述了VPN建设中的诸多考虑因素。探讨了VPN的产生背景及其能够实现的功能,VPN利用不可靠的公用互联网络作为信息传输媒介,通过附加的安全隧道,用户认证,访问控制等技术实现与专用网络类似的安全性能;对企业建设VPN网络及产品选择做了详述。 相似文献