针对传统的混合表面形状恢复算法存在较大误差的问题,提出了一种基于透视投影的从混合表面的明暗变化恢复形状的新算法。首先,建立了一种改进的Ward反射模型来描述混合表面的反射特性,其次,采用更接近摄像机实际拍摄的透视投影方式,并...针对传统的混合表面形状恢复算法存在较大误差的问题,提出了一种基于透视投影的从混合表面的明暗变化恢复形状的新算法。首先,建立了一种改进的Ward反射模型来描述混合表面的反射特性,其次,采用更接近摄像机实际拍摄的透视投影方式,并且假定光源位于摄像机的光心处,构造了新模型下的图像辐照度方程,然后将该方程转化为包含物体表面深度信息的Hamilton-Jacobi偏微分方程,使用Fixed-point Iterative Sweeping方法和2D Central Hamiltonian函数逼近该微分方程的黏性解,进而得到物体表面的三维形状。与同类算法相比,新算法恢复的结果更加准确有效。合成花瓶图像的实验结果表明,与基于正交投影的算法相比,新算法恢复三维形状高度的平均误差和均方根误差均有较大幅度减少。展开更多
为实现长距离传输及亚波长尺度的模式限制,在传统介质加载型表面等离子结构的基础上,设计了一种微孔介质加载混合表面等离子体波导,采用时域有限差分法(FDTD)对该波导模式场分布及传输特性进行了相应的研究。研究表明所设计的波导结构...为实现长距离传输及亚波长尺度的模式限制,在传统介质加载型表面等离子结构的基础上,设计了一种微孔介质加载混合表面等离子体波导,采用时域有限差分法(FDTD)对该波导模式场分布及传输特性进行了相应的研究。研究表明所设计的波导结构具有较强的局域场限制,通过在孔内填充增益介质,使混合等离子体波导的传输损耗得到了补偿,输出端的表面等离子激元实现了增益放大。结果表明,通过调整波导的几何参数和电磁参数,可以显著提高波导的场限制,降低波导本身的损耗,其中当孔与金属之间距离为44 nm时,波导的损耗达最小约为-13 d B/μm。这一设计可以为光子器件集成提供一定的理论和实验借鉴价值。展开更多
研究了十四烷基三甲基氯化铵(TTAC)和十二烷基苯磺酸钠(SDBS)混合表面活性剂水溶液双水相体系的性质,测定了分相区域并绘制了相图,以色氨酸为对象研究了双水相体系的萃取作用。实验结果表明,20~40℃,n(SDBS)∶n(TTAC)=(1.6∶1)^(1∶4)...研究了十四烷基三甲基氯化铵(TTAC)和十二烷基苯磺酸钠(SDBS)混合表面活性剂水溶液双水相体系的性质,测定了分相区域并绘制了相图,以色氨酸为对象研究了双水相体系的萃取作用。实验结果表明,20~40℃,n(SDBS)∶n(TTAC)=(1.6∶1)^(1∶4)可以形成双水相;TTAC过量区双水相上下相体积比随TTAC摩尔分数的增大而减小,加入正丁醇后分相速度加快,可在12 m in内分相,上下相体积比增大;电导率曲线与偏光显微镜图片表明,TTAC过量区双水相下相存在松散的液晶结构。该文报道工作的新颖性已为科学技术部西南信息中心查新中心2007年8月16日出具的第J 20071385号《科技查新报告》所证实。展开更多
Using the mixture of cationic surfactant cetyltrimethylammonium bromide(CTAB) and six nonionic surfactants as templates, meso porous silica was synthesized. The d space of silica templated by CTAB is 3.5 nm. The d spa...Using the mixture of cationic surfactant cetyltrimethylammonium bromide(CTAB) and six nonionic surfactants as templates, meso porous silica was synthesized. The d space of silica templated by CTAB is 3.5 nm. The d spaces could be controlled by changing the ratio of nonionic to cationic surfactants and by increasing the length of nonpolar chain of nonionic surfactants in the mixed cationic nonionic surfactant templating systems. The pore dimension of silica in the mixed surfactants templating system is larger than that in CTAB system and a well ordered structure of pore array was maintained. [WT5HZ]展开更多
Cloud point property was found in the aqueous mixtures of sodium dodecyl sulfate（SDS）and cetyl trimethyl ammonium bromide（CTAB）and the cloud point area in pseudo ternary plase diagram of SDS/CTAB/Na2SO4/H2O was st...Cloud point property was found in the aqueous mixtures of sodium dodecyl sulfate（SDS）and cetyl trimethyl ammonium bromide（CTAB）and the cloud point area in pseudo ternary plase diagram of SDS/CTAB/Na2SO4/H2O was studied.It was found that the cloud point area was the aqueous two-phase system area,in which the containing of SDS was more than that of CTAB.The cloud point area would enlarge when the temperature was high and the length of cationic surfactant carbochain had some effect on the position of cloud point area.展开更多
文摘针对传统的混合表面形状恢复算法存在较大误差的问题,提出了一种基于透视投影的从混合表面的明暗变化恢复形状的新算法。首先,建立了一种改进的Ward反射模型来描述混合表面的反射特性,其次,采用更接近摄像机实际拍摄的透视投影方式,并且假定光源位于摄像机的光心处,构造了新模型下的图像辐照度方程,然后将该方程转化为包含物体表面深度信息的Hamilton-Jacobi偏微分方程,使用Fixed-point Iterative Sweeping方法和2D Central Hamiltonian函数逼近该微分方程的黏性解,进而得到物体表面的三维形状。与同类算法相比,新算法恢复的结果更加准确有效。合成花瓶图像的实验结果表明,与基于正交投影的算法相比,新算法恢复三维形状高度的平均误差和均方根误差均有较大幅度减少。
文摘为实现长距离传输及亚波长尺度的模式限制,在传统介质加载型表面等离子结构的基础上,设计了一种微孔介质加载混合表面等离子体波导,采用时域有限差分法(FDTD)对该波导模式场分布及传输特性进行了相应的研究。研究表明所设计的波导结构具有较强的局域场限制,通过在孔内填充增益介质,使混合等离子体波导的传输损耗得到了补偿,输出端的表面等离子激元实现了增益放大。结果表明,通过调整波导的几何参数和电磁参数,可以显著提高波导的场限制,降低波导本身的损耗,其中当孔与金属之间距离为44 nm时,波导的损耗达最小约为-13 d B/μm。这一设计可以为光子器件集成提供一定的理论和实验借鉴价值。
文摘研究了十四烷基三甲基氯化铵(TTAC)和十二烷基苯磺酸钠(SDBS)混合表面活性剂水溶液双水相体系的性质,测定了分相区域并绘制了相图,以色氨酸为对象研究了双水相体系的萃取作用。实验结果表明,20~40℃,n(SDBS)∶n(TTAC)=(1.6∶1)^(1∶4)可以形成双水相;TTAC过量区双水相上下相体积比随TTAC摩尔分数的增大而减小,加入正丁醇后分相速度加快,可在12 m in内分相,上下相体积比增大;电导率曲线与偏光显微镜图片表明,TTAC过量区双水相下相存在松散的液晶结构。该文报道工作的新颖性已为科学技术部西南信息中心查新中心2007年8月16日出具的第J 20071385号《科技查新报告》所证实。
文摘Using the mixture of cationic surfactant cetyltrimethylammonium bromide(CTAB) and six nonionic surfactants as templates, meso porous silica was synthesized. The d space of silica templated by CTAB is 3.5 nm. The d spaces could be controlled by changing the ratio of nonionic to cationic surfactants and by increasing the length of nonpolar chain of nonionic surfactants in the mixed cationic nonionic surfactant templating systems. The pore dimension of silica in the mixed surfactants templating system is larger than that in CTAB system and a well ordered structure of pore array was maintained. [WT5HZ]
文摘Cloud point property was found in the aqueous mixtures of sodium dodecyl sulfate（SDS）and cetyl trimethyl ammonium bromide（CTAB）and the cloud point area in pseudo ternary plase diagram of SDS/CTAB/Na2SO4/H2O was studied.It was found that the cloud point area was the aqueous two-phase system area,in which the containing of SDS was more than that of CTAB.The cloud point area would enlarge when the temperature was high and the length of cationic surfactant carbochain had some effect on the position of cloud point area.
