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蔗糖酯分子在碱性条件下,加热水解为蔗糖和硬酯酸,在pH>10的NH_3·N_2O-(NH_3)_3C_6H_5O_7体系中,于示波极谱仪上,峰电位─0.91V处出现一灵敏度高和稳定性好的极谱图,其浓度从0.02~0.28mg/mL与峰电流呈线性关系,最低检出限为0.004mg/mL,相对标准偏差为1.3%。 相似文献
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Characteristics of Sb_6Te_4/VO_2 Multilayer Thin Films for Good Stability and Ultrafast Speed Applied in Phase Change Memory
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The Sb_6Te_4/VO_2 multilayer thin films are prepared by magnetron sputtering and the potential application in phase change memory is investigated in detail. Compared with Sb_6Te_4, Sb_6Te_4/VO_2 multilayer composite thin films have higher phase change temperature and crystallization resistance, indicating better thermal stability and less power consumption. Also, Sb_6Te_4/VO_2 has a broader energy band of 1.58 eV and better data retention(125℃ for 10 y). The crystallization is suppressed by the multilayer interfaces in Sb_6Te_4/VO_2 thin film with a smaller rms surface roughness for Sb_6Te_4/VO_2 than monolayer Sb_4Te_6. The picosecond laser technology is applied to study the phase change speed. A short crystallization time of 5.21 ns is realized for the Sb_6Te_4(2 nm)/VO_2(8 nm)thin film. The Sb_6Te_4/VO_2 multilayer thin film is a potential and competitive phase change material for its good thermal stability and fast phase change speed. 相似文献
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随着信息化时代的快速发展,各种计算机技术以及电子信息技术的应用使得很多工作的信息化程度都逐渐提高。在企业档案管理中,数字化档案成为档案管理的一种新模式。档案管理模式也由传统的管理方式向现代化进行转变。但是数字化档案的应用的过程中还是存在一些安全问题。本文浅述企业的数字化档案在应用过程中的安全问题以及相应的应对措施。 相似文献
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The bending characteristics of dual-hole polarization maintaining photonic crystal fiber (PM-PCF) are demonstrated in this paper. The modal interference is induced by the LP01 mode and LP11 mode propagating in a single PM-PCF with the same polarization direction. Simulation results demonstrate that the bending radius induces the phase difference between LP01 mode and LP11 mode, which leads to the change of light interference intensity on the fiber output facet. The relationship between bending radius and normalized interference intensity with three different bending angles is discussed, where the bending angle is defined as the angle between hole axis and the x axis. The bending sensitivity is obtained to be about -188.78/m around the bending radius of 1.5 cm with the bending angle of 90°. The bending characteristics can contribute for online bending detection in widespread areas. 相似文献
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Influence of disorder and deformation on the optical properties of two-dimensional photonic crystal waveguide
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We investigate the effect of disorder and mechanical deformation on two- dimensional photonic crystal waveguide. The dispersion characteristics and transmittance of the waveguide are studied by using the finite element method. Results show that the geometric change of the dielectric material perpendicular to the light propagation direction has a larger influence on the waveguide characteristics than that parallel to the light propagation direction. Mechanical deformation has an obvious influence on the performance of the waveguide. In particular, longitudinal deformed structure exhibits distinct optical characteristics from the ideal one. Studies on this work will provide useful guideline to the fabrications and practical applications based on photonic crystal waveguides. 相似文献
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GC-MS联用分析火龙果花提取液的化学成分 总被引:4,自引:0,他引:4
采用GC/MS分析火龙果花无水乙醇、CH2Cl2提取液的化学成分.从无水乙醇和CH2C12提取液中分别分离出60和54个峰,经NIST数据库检索、与标准谱图比较共鉴定出49个化学组分.结果表明,火龙果花中含有维生素E,脂肪酸,烃类和β-谷甾醇、豆甾醇、菜油甾醇等甾醇类化合物. 相似文献
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双偏振微结构光纤光栅的折射率传感特性分析 总被引:1,自引:1,他引:0
研究了微结构光纤(MOF)布拉格光栅(FBG)的双偏振折射率传感特性。利用有限元方法对保偏微结构光纤(PM-MOF)的传输特性进行了分析,计算了传输特性曲线,分析了该种光纤单模传输的范围。同时结合耦合模理论,仿真了该种光纤均匀布拉格光栅在充入不同介质时的反射谱,得到两个偏振模LP0x1和LP0y1的中心波长差与介质折射率的关系曲线,通过特性曲线拟合出相应公式。同时,仿真了该光纤光栅的温度特性,研究结果表明,两个偏振模中心波长对温度响应相似,因此利用双偏振差分的方式来探测,具有较强的抗干扰能力,这一特性为光纤生物传感器的应用提供了理论依据。 相似文献
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裂解气相色谱-质谱联用法分析卷烟燃吸产物 总被引:2,自引:0,他引:2
应用带有吸附阱的CDS 5200型热裂解仪,在不同的裂解温度条件下对卷烟样品进行裂解处理,所得裂解产物直接引入仪器进行气相色谱-质谱分析,检测其中的特征组分、烟碱、新植二烯及有害物质,所测得结果与按标准GB/T 19609-2004方法测得的结果作比较。结果表明:①有害物质的裂解释出量随裂解温度降低而明显下降;②半挥发性烟碱的裂解释出量与常态卷烟吸燃温度相近的裂解温度下不存在相关性;③非挥发性的新植二烯的裂解释出量随裂解温度升高而降低;④在常态卷烟吸燃温度下,所测得的烟碱及新植二烯的释出量基本相同;⑤主流烟气中烟碱主要通过蒸馏而并非通过裂解释出;⑥卷烟吸燃温度的降低有利于减少有害物质的释出;⑦所提出的裂解处理方法作为卷烟燃吸产物的模拟分析是可行的。 相似文献