光谱法研究FCLA与人血清白蛋白的相互作用

在生物学和医学中活性氧的检测非常重要。海萤荧光素类似物FCLA是检测单态氧(1O₂)和超氧阴离子(O-₂)的一种高灵敏的化学发光探针。文章用光谱法研究了FCLA与人血清白蛋白(HSA)的结合反应,发现FCLA对HSA的荧光有很强的猝灭作用。从荧光猝灭结果求得了FCLA与HSA的结合位点数。根据Frster非辐射能量转移机理探讨了二者相互结合时其给体-受体间的距离和能量转移效率, 从而证实了它们的结合作用为静态猝灭过程。阐明了由于能量转移所导致的HSA荧光的猝灭及FCLA荧光的产生机理。通过光谱法对FCLA与HSA的相互作用的研究,阐明FCLA的运输过程及其在体内的作用机制,对实现利用探针在体检测活性氧具有一定的意义,同时也为药物动力分析、体内药物转运的研究提供了基础。     

Dispersion Theory of Polaron in a Parabolic Quantum Dot at Finite Temperatures

By using the dispersion theory instead of the Fröhlich Hamiltonian, the polaron energy in a quantum dot with a parabolic confinement potential is investigated at finite temperatures. It is found that the self-trapping energy of the polaron decreases with the increasing temperature, and the temperature effect is more obvious in quantum dots with weaker confinement.     

粒子模拟中的一种高频噪声抑制算法

对粒子模拟中的高频噪声的产生机理进行分析,并给出一种既能对高频数值噪声进行过滤又能满足Q值较高的相对论型微波器件计算要求的时域有限差分(FDTD)算法——High_Q FDTD算法.在中心差分FDTD算法和时偏FDTD算法的基础上,给出High_Q算法的计算公式,并着重分析算法的稳定性与收敛性.通过对相对论返波管(RBWO)的计算,将计算结果与中心差分和时偏FDTD算法的计算结果比较,验证算法有较好的滤波特性和计算精度.     

Coherent X-Ray Scatter for Identifiction of Explosives

Coherent X-ray scattering spectra of some explosives (black powder, TNT, etc.) and some non-explosives (sugar, milk powder, coffee, paper, etc.) have been measured using polychromatic X-rays (1.2—38.2KeV) on Beijing Synchrotron Radiation Facility of IHEP Beijing. The measured peak positions of X-ray diffraction spectra can be regarded as a 'fingerprint' of the explosives. Principally, peak positions and identification techniques of diffraction spectra can be used for the identification of explosives.     

质子探针在流体包裹体分析中的应用

本文着重阐述了质子探针无标样定量分析流体包裹体的方法原理、技术要点和分析时注意的问题。作者对我国斑岩铜矿石英中的流体包裹体进行了分析,还就国内外质子探针分析流体包裹体的现状进行了评述和展望。     

V(100)表面上S和O偏析的LEED—AES研究

用AES,LEED等表面分析手段,对V(100)表面上杂质S,O偏析作了详细研究。明确了S,O偏析关系;发现(8×1)-O,(4×1)-O两个新的表面结构;系统观察和分析了V(100)表面在不同S,O偏析量情况下的各种表面超结构,并获得这些表面超结构的相互关系。 关键词：     

四元Heisenberg群上次拉普拉斯算子的m幂次的基本解

本文研究了四元Heisenberg群上次拉普拉斯算子的m幂次的基本解,该结论是Heisenberg群上结果的推广.本文利用了四元Heisenberg群上的Fourier变换理论构造了该群上次拉普拉斯算子的m幂次的基本解,并且给出了基本解的积分表示.     

Exceptional groups of Lie type and flag-transitive triplanes

A triplane is a ( v, k, 3)-symmetric design. Let G be a subgroup of the full automorphism group of a triplane D. In this paper we prove that if G is flag-transitive and point-primitive, then the socle of G cannot be a simple exceptional group of Lie type.     

Study of Mass Distribution of Carbon Cluster Anions by a Laser Vaporization/Pulsed Molecular Beam Method

By a laser vaporization/pulsed molecular beam method,the carbon anion clusters (n=1 to 45) are produced and analyzed. An evident odd-even abundance alternation pattern is observed,with the even-numbered (n=8,10,14,16,18,20,22,24,26,28 and 30) standing out. It can also be observed that the peaks at n=5 and n=13 are prominent. Compared with the results obtained by other authors,a discussion concerning cluster structures is made.