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排序方式: 共有141条查询结果,搜索用时 15 毫秒
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XU Ou LU ShaoHua & JIAN ShuiSheng Faculty of Information Engineering Guangdong University of Technology Guangzhou China 《中国科学:信息科学(英文版)》2010,(2):390-397
The polarization properties for tilted fiber Bragg gratings (TFBGs) are investigated theoretically based on coupled-mode theory and Mueller matrix method. The expression of wavelength-related polarizationdependent loss (PDL) for TFBGs with different tilt angles is derived and calculated. Simulation results are compared, and the results indicate that the polarization capability of TFBGs with 45° angle is stronger than other TFBGs with smaller angles. The degree of polarization for unpolarized light passing T... 相似文献
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光纤型偏振OCT 系统中光偏振特性的研究 总被引:2,自引:0,他引:2
建立了偏振光在生物组织中传播的模型,并利用该模型模拟了偏振光在生物组织中传播的过程,重建了多种偏振态输入光的情况下光偏振态在生物组织中的分布及生物组织的偏振特性模型.分析了光偏振度与光被生物组织散射次数的关系,阐明了由于偏振光在组织中传播,其偏振态逐渐改变而造成的偏振OCT 干涉计两臂光束失去相干性及偏振OCT 图像质量下降现象.通过分析斯托克斯(Stokes)矢量和穆勒(Muller)矩阵在光纤型偏振OCT系统中的应用,说明Muller 矩阵不受输入光偏振态的影响,因此它比Stokes 矢量更适用于光纤型偏振OCT 系统研究. 相似文献
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实验通过添加纳米粒子SiO2,研究抑制软质聚氯乙烯(PVC)中增塑剂邻苯二甲酸二辛脂(DOP)迁移规律,评价PVC样品溶剂抽出率,对挥发损失率、拉伸性能和邵氏硬度的测定分析,得出以下结论:纳米粒子SiO2可以抑制软质PVC中DOP的迁移。用正己烷浸泡PVC样品,随浸泡时间的延长,溶剂抽出率增大;随着添加的纳米SiO2含量的增加,样品的溶剂抽出率降低。在浸泡24h后,添加5份纳米SiO2样品PVC的溶剂抽出率为18.9%,比对照(25.6%)降低了26.2%。添加少量的纳米SiO2并没有使样品的挥发损失率明显降低,添加1~5份不同量的纳米SiO2的样品的挥发损失率均比不添加纳米SiO2的对照样品低。随着无机纳米粒子含量的增加,样品的拉伸强度和断裂伸长率反而降低,硬度有所增加。 相似文献
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This paper reports work studying the partial substitution of the commonly used plasticiser di-octyl phtalate (DOP) by the permanent plasticisers ethylene-vinyl-acetate (EVA) and acrylonitrile-butadiene-styrene (ABS) in order to reduce migration of additives initially present in poly(vinyl chloride) (PVC) stabilised with epoxidised sunflower oil (ESO). Various formulations with and without the two different permanent plasticisers were prepared. Their tensile properties were compared. Migration tests with agitation at 40°C in two food simulants (olive oil and 15% aqueous ethanol) were carried out. The mass variation of the PVC samples with time was investigated. Migration phenomena were studied by using various analytical methods such as Fourier transform infrared spectroscopy (FTIR), atomic absorption spectrometry (AAS) and scanning electron microscopy (SEM). The results showed that additives migration can be considerably reduced by partial substitution of DOP with both permanent plasticisers used. The best results were obtained with the binary system of plasticisers based on DOP:ABS (30:10). 相似文献
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Benoit Igne Jean-Michel Roger Sylvie Roussel Vronique Bellon-Maurel Charles R. Hurburgh 《Chemometrics and Intelligent Laboratory Systems》2009,99(1):57-65
Eight calibration transfer methods based on the removal of orthogonal signal were compared for the standardization of whole soybean protein and oil models. Dynamic orthogonal projection (DOP), transfer by orthogonal projection (TOP), error removal by orthogonal subtraction (EROS), orthogonal signal correction (OSC), and orthogonal projections to latent structures (O-PLS) as well as the modification and extension of some of these methods were compared in the transfer of models in intra and inter-brand situations using two Foss Infratecs and two Bruins OmegAnalyzerGs. For each brand, a master was designated and its models transferred onto the second unit of its network and the two units of the second brand. Calibration models were transferable from brand to brand with similar or better precision than when each instrument was calibrated on its own calibration set (for Infratec 1229, the relative predictive determinant (RPD) increased in intra and inter-brand calibration transfer situations from 10.42 to 11.45 and 10.57, with DOP and EROS respectively). Performance of each method was different across parameters, instruments, and validation sets. DOP modifications on the determination of the difference matrix showed promising results while TOP and EROS extensions to include variability specifically present in certain crop years did not bring any beneficial effects. 相似文献
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本文研究了在常压和较低的温度下的均相和固载型杂多蓝催化剂在合成DOP中的催化作用。实验表明在合成DOP的酯化反应中,杂多蓝具有较高的催化活性和选择性。 相似文献