人膀胱癌组织对不同波长的激光及其线偏振激光的衰减特性比较研究

采用双积分球系统和光辐射测量技术的基本原理以及运用生物组织的光学模型,研究了4765,488,4965,5145,532nm激光及其线偏振激光辐照人膀胱癌组织的光衰减特性。结果表明在5个不同的激光波长范围内,KubelkaMunktwoflux模型下的人膀胱癌组织对不同波长的激光及线偏振激光的衰减特性是不同的,人膀胱癌组织对4765,4965,532nm激光及其线偏振激光的总衰减系数或有效衰减系数均具有显著性差异(P<005),而对488,5145nm波长的激光及其线偏振激光的总衰减系数或有效衰减系数则均没有显著性差异(P>005),人膀胱癌组织对532nm激光及其线偏振激光的总衰减系数或有效衰减系数均明显大于其他4个波长的Ar 激光及其线偏振激光的总衰减系数或有效衰减系数。在传输理论下人膀胱癌组织对5个不同波长的激光及其线偏振激光的总衰减系数均随着波长的增大而减小,人膀胱癌组织对4765,4965,5145nm波长的激光及其线偏振激光的总衰减系数均有显著性差异(P<005),其对488,532nm波长的激光及其线偏振激光的总衰减系数均没有显著性差异(P>005)。     

慧差对线偏振贝塞耳-高斯光束聚焦场的影响

利用Richards-Wolf矢量衍射积分公式,获得线偏振贝塞耳-高斯光束经具有初级慧差的高数值孔径系统聚焦后的三维光场复振幅函数,根据复振幅函数模拟了不同慧差系数下线偏振贝塞耳-高斯光束各分量及总光场在焦平面上的光强分布模式。研究结果表明,初级慧差使线偏振贝塞耳-高斯光束聚焦光场在焦平面的分布由双轴对称变成单轴对称,光强模式发生改变;各分量及总光场的光强模式中的光斑位置随初级慧差系数的增大偏离光轴;大的初级慧差使焦平面出现干涉条纹。     

UV-Polarizing Linear Polyyne Molecules Aligned in PVA

Electronic absorption bands of conjugated linear carbon chain molecules, namely polyynes H(C≡C)_nH (n=5-7), are exploited to devise light-polarizing films applicable to the UV. Laser ablated polyynes are separated in size and dispersed in a film of polyvinyl alcohol (PVA), which is stretched to align the trapped linear polyyne molecules inside. As a nature of the structural anisotropy, transition dipole of the UV absorption for polyyne molecules is in parallel with the molecular axis and the absorption occurs only for the electromagnetic wave having the amplitude of its electric vector along the molecular axis. Aligned and fixed orientationally in the solid PVA film, polyyne molecules act as selective absorbers of one of the polarization components of incident light at particular wavelength. Using a light source of linearly polarized UV light, whose direction of polarization is rotatable, angular dependence of the absorption intensity is investigated for the stretched PVA film containingaligned polyyne molecules and analyzed in terms of an order parameter in the theory of linear dichroism.     

线性变位极谱法研究(ⅩⅩⅠ)——统一的卷积和去卷积配位吸附电流理论

推导出统一的卷积和去卷积配位吸附电流方程式,讨论了电流、电位性质,并进行了验证,实验结果与理论相符。     

Optimal measures,nonzero projections,and irreducible representations

This brief note considers the problem of maximizing the probability of detection for a finite number of mixed quantum states. It is shown that for linearly independent density matrices, an optimal measure that is simple and unique contains nonzero operators that are orthogonal projections on subspaces associated to irreducible representations (irreps) of a finite-dimensional Hilbert space.     

Asteroid debris: Temporary capture and escape orbits

We investigate the dynamical behaviour of debris ejected from the surface of an asteroid, due to a generic – natural or artificial – surface process. We make an extensive statistical study of the dynamics of particles flowing from the asteroid. We observe different behaviours: particles which fall again on the asteroid surface, or rather escape from its gravitational field or are temporary trapped in orbit around the asteroid. The tests are made by varying different parameters, like the size of the asteroid, its eccentricity, the angular velocity of the asteroid, the area-to-mass ratio of the debris.We also extend the study to the case of a sample of binary asteroids with a mass ratio equal to 10⁻³; we vary the distance of the moonlet from the asteroid, to see its effect on the debris dynamics.Our simulations aim to identify regions where the debris can temporarily orbit around the asteroid or rather escape from it or fall back on the surface. These results give an important information on where a spacecraft could be safely stay after the end of the process which has produced the debris.     

Group classification and conservation laws of nonlinear filtration equation with a small parameter

Group classification of the perturbed nonlinear filtration equation is performed assuming that the perturbation is an arbitrary function of the dependent variable. The nonlinear self-adjointness of the equation under consideration is investigated. Using these results, the approximate conservation laws are constructed.     

Synthesis and Properties of 2‐Phenylbenzoxazole‐Based Luminophores for in situ Photopolymerized Liquid‐Crystal Films

We report the synthesis of a series of blue‐emitting 2‐phenylbenzoxazoles (PBOs) substituted at either the 5‐ or 6‐position of the benzoxazole ring and the para‐position of the phenyl substituent. The thermal and optical properties of the materials can be rationalized in terms of the position of the substituent at the benzoxazole moiety and the electron‐withdrawing or electron‐donating character of the substituents. From the results, we conclude that the combination of an electron‐donating substituent at the benzoxazole fragment and an electron‐withdrawing one at the phenyl fragment has a more marked effect on the electronic properties of the aromatic PBO core than other possibilities. This particular combination gives luminophores that are suitable for optical applications on the basis of their high emission efficiency and photostability. In view of that, oriented films were prepared by in situ polymerization of a mixture of a liquid crystalline direactive matrix containing 5% (w/w) of the luminophore. The films exhibit linearly polarized emission.     

Cinnamate-functionalized hyperbranched polymer as liquid crystal photo-alignment layer

In this work, 4-methoxylcinnamoyl chloride was reacted with a commercial hyperbranched polymer （Boltom-TM H30） to prepare a hyperbranched photosensitive polymer （H30-Ci）. The polymer was characterized by UV absorption spectrum and 1H- NMR spectrum. After processed by Linearly Polarized Polymerization （LPP） method, the spin-coated films of H30-Ci were used as photo-alignment layers to assemble liquid crystal （LC） cells containing nematic liquid crystal （5CB）. The observation by polarized microscope showed that the H30-Ci blended with a linear polymer （BP-AN-Ci） photo-alignment layers could align LC molecules in a very uniform way.     

Separability and dynamical symmetry of Quantum Dots

The separability and Runge–Lenz-type dynamical symmetry of the internal dynamics of certain two-electron Quantum Dots, found by Simonovi? et al. (2003), are traced back to that of the perturbed Kepler problem. A large class of axially symmetric perturbing potentials which allow for separation in parabolic coordinates can easily be found. Apart from the 2:1 anisotropic harmonic trapping potential considered in Simonovi? and Nazmitdinov (2013), they include a constant electric field parallel to the magnetic field (Stark effect), the ring-shaped Hartmann potential, etc. The harmonic case is studied in detail.