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通过估计d维分数Brown运动在Holder范数下的大偏差概率,得到了分数Brown运动的连续模性质. 相似文献
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Vitamin E is widely used in pharmaceutical, food and cosmetic preparations.This paper discusses methods of preparing vitamin E emulsions by using sulfobetaine (SB) zwitterionic surfactants which have high electrolyte tolerance. The amount of vitamin E dissolved in water was analyzed by turbidity and UV absorption measurements. The emulsion droplet size was determined by laser light scattering. Microemulsions with small particle size and high resistance to oxidation in air can be obtained by solubilizing vitamin E in SB solutions at high concentrations (above %) The performance of a series of SB surfactants is compared in 1.5% solutions. A SB surfactant with a 12 carbon chain seems to be the most effective in dissolving vitamin E. The saturation value of vitamin E is increased about one order of magnitude by adding NaCl to the SB surfactant solutions. Emulsions formed in surfactant solutions containing NaCl (0 4-0.6 M) are stable at low surfactant concentrations such as 0.2-0.4 % The emulsion droplet sizes are below or around 200nm. 相似文献
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我国四川、云南等地出产的兰科植物金石斛(Dendrobium nobile)中含植物碱.Suzuki等[1]及陈克恢等[2]自其中分离出石斛碱(dendrobine,C16H25O2N);最近Yamamura等[3]又分离出一种新植物碱——nobiline(建议译为新石斛碱),C17H27O3N.Inubushi等[4]与Yamamura等[3]分别独立提出石斛碱(Ⅰ)的部分相对构型式;后者尚测定了新石斛碱(Ⅱ)的部分相对构型式.它们的结构与天然有机物苦毒宁(picrotoxinin)[5](Ⅲ)很相似. 相似文献
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The high spin states of neutron-rich 103Nb, 107Tc and 109Tc nuclei in A~110 region have been investigated by measuring prompt γ-γ-γ coincident measurements populated with the spontaneous fission of 252Cf with the Gammasphere detector array. In 103Nb, one-phonon K = 9/2 and two-phonon K = 13/2 γ-vibrational bands have been identified. In 107Tc and 109Tc, one-phonon K = 11/2 and two-phonon K = 15/2 γ-vibrational bands, in which the zero-phonon bands are based on K=7/2 excited states, have also been identified... 相似文献
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用磁控溅射法在单晶MgO(100)基片上制备了[FePt 2 nm/Ag dnm]10多层膜, 经真空热处理后,得到具有高矫顽力的垂直取向L10-FePt/Ag颗粒膜.x射线衍射结 果表明,在250 ℃的热基片上溅射,当Ag层厚度d=3—11 nm时,FePt颗粒具有很好的[001]取向,随着Ag层厚度的增加,FePt颗粒尺寸减小.[FePt 2 nm/Ag 9 nm]10经过6 00 ℃真空热处理15 min后,颗粒大小仅约8 nm,垂直矫顽力达到692 kA/m.这种无磁耦合作用的颗粒膜,适合用作超高密度的垂直磁记录介质.
关键词:
磁控溅射
垂直磁记录
纳米颗粒膜
0-FePt/Ag')" href="#">L10-FePt/Ag 相似文献
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采用直流磁控溅射方法制备了Fe/Pt多层膜和FePt单层薄膜,再经不同温度真空热处理得到了有序相Ll0-FePt薄膜.通过x射线衍射谱和磁性研究表明,FePt单层薄膜需要在500℃以上热处理,才能开始有序化转变,而Fe/Pt多层膜可以降低FePt薄膜有序化温度.[Fe(1.5 nm)/Pt(1.5 nn)]13薄膜在350℃热处理后,有序度已经增加到0.6,相应矫顽力达到了501 kA/m.多层膜化促进有序化在较低的温度下进行,这是由于热处理过程中多层膜界面的消失提供了有序化过程额外的驱动力. 相似文献
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通过估计d维分数Brown运动在H(o)lder范数下的大偏差概率,得到了分数Brown运动的连续模性质. 相似文献