Darboux Transformation with a Double Spectral Parameter for the Myrzakulov-I Equation

The Myrzakulov-I equation is a 2＋l-dimensional generalization of the Heisenberg ferromagnetic equa- tion and has a non-isospectral Lax pair. The ex- plicit solutions to the Myrzakulov-I equation have been discussed by many researchers. Darboux transformation is one of the useful methods to ob- tain explicit solutions to the nonlinear partial differ- ential equation. The Darboux transformation of de- gree 1 for this equation has been constructed and exact global ＇one-soliton＇ solutions are derived.     

Persistent Current in a Mesoscopic Ring Side-Attached with a Quantum Dot

We theoretically investigate properties of the ground state of a closed dot-ring system with a magnetic flux in the Kondo regime by means of a tight-banding Anderson Hamiltonian, using the Slave-Boson mean-field approach. The persistent current shows interesting dependences on the parity and on the size of the system. The signature of Kondo resonance at ζk/L = 0.15 is expected to be observed experimentally in the future. With the intensity of the coupling tD changes from weak to strong, the properties of the system changes largely, which are different from the in-line one because of the attached dot.     

GdBCO超导体的顺磁性及低温下磁通分布的动态观测

本文研究了100～300K之间Gd1．8Ba2.4Cu3．4O7-δ（简写为GdBCO）超导体的顺磁性，对GdBCO的磁化强度随磁场和温度的变化分别在100K和0．1T进行了测试，GdBCO的顺磁性遵从朗之万顺磁性理论．在磁光显微镜下，低温12K场冷下，我们观察了从0mT～29mT磁通线进入GdBCO的超导体的过程，以及磁通线在GdBCO超导体中的分布。     

铁电压控谐振器的研究

研究了单端加载铁电叉指电容的微带半波长谐振器的压控特性.铁电材料为LaAlO3衬底上脉冲激光淀积的SrTiO3,叉指电容电极为金.测量了谐振器77K下的压控谐振性能.谐振频率在6GHz左右,70V偏压下的压控频率范围大于180MHz.在10～40V内,谐振频率与偏置电压之间呈良好的线性关系,谐振器的有载Q值为60～90.     

诺氟沙星与DNA的拉曼光谱研究

报道了诺氟沙星(NFX)及诺氟沙星胶囊内容物的FT-Raman光谱和在银胶基底上的表面增强拉曼光谱(SERS),归属了各个振动;研究了诺氟沙星与DNA的相互作用的SERS,结果表明:胶囊内容物的拉曼光谱图与对照品的拉曼光谱图的特征振动峰:C-F键的伸缩振动,C=C伸缩振动,O-C-O的对称伸缩振动峰值未发生变化,发生变化主要是分子骨架振动峰,诺氟沙星胶囊的辅料对拉曼光谱无实质影响,可建立拉曼光谱法检测诺氟沙星药物的分析方法;诺氟沙星可以在没有金属离子的存在下与DNA直接作用,与DNA相互作用的主要键合模式是插入作用,NFX分子中的平面结构插入DNA的双螺旋碱基平面,为深入了解喹诺酮类抗生素的抗菌机理提供可靠依据.     

Separability of Bipartite Superoperator Based on Witness

Based on the isomorphic relation between operator space L(H) and Hilbert space H^⊕2, Cirac et al. mapped the global superoperator to a mixed state E which has the same separability of the initial superoperator. Zhang et al. [Phys. Rev. A 76(2007)012334] provided a calculable lower bound for both the linear and nonlinear witness. We use this bound to detect the entanglement of E to judge the separability of the initial superoperator. With the help of local orthogonal observables, we directly describe the separable condition of superoperator by its each operator. Lastly, using the lower bound of the nonlinear witness, we provide a calculable entanglement factor of bipartite superoperator.     

Excitonic Coupling between B and Q Transitions in Porphyrin Aggregates

The properties of meso-tetraphenylporphine （TPP） aggregates formed in acidic aqueous-organic solutions are investigated by UV-vis spectroscopy. According to the absorption spectra, the Q band absorption of the aggregated TPP shows red shift and intensity enhancement, and a model that includes the participation of water molecules in a porphyrin aggregation complex is proposed, then a qualitative explanation based on Gouterman＇s excition coupling theory is presented. Calculations including eigenenergies, eigenstates and the transition dipole strength of the coupled states are carried out.     

反应扩散系统中波传播的锁频现象

在空间延展系统中,当增强外部光强时,作者观察到波传播的N∶N-1(N≥2)锁频现象.此现象是在光敏BZ反应实验中观察到的.通过构建一个映射函数,发现在波周期和外部光强的关系中存在魔鬼阶梯,并且此阶梯与实验数据相吻合.     

电离辐射引起的线粒体DNA损伤及突变研究进展

指出了线粒体DNA损伤及突变研究与核DNA相关研究的区别,并总结了国内外关于电离辐射引起线粒体DNA损伤突变的研究进展。 针对放射生物学中线粒体学方面研究还有待进一步加强的现状, 中国科学院近代物理研究所的研究人员在方法学上建立起了real-time PCR和long PCR等手段对线粒体DNA损伤及突变进行定量检测, 并以此为基础, 对电离辐射引起的线粒体功能变化进行了较为深入的研究。总结了线粒体DNA损伤及突变研究对阐明电离辐射引起的生物学效应所具有的贡献, 提出未来在放射生物学中以远后效应, 能量代谢为主的线粒体学研究方向。 Current advance in ionizing radiation induced mitochondrial DNA damage and mutations is reviewed, in addition with the essential differences between mtDNA and nDNA damage and mutations. To extent the knowledge about radiation induced mitochondrial alterations, the researchers in Institute of Modern Physics, Chinese Academy of Sciences developed some technics such as real time PCR, long PCR for accurate quantification of radiation induced damage and mutations, and in depth investigation about the functional changes of mitochondria based on mtDNA damage and mutations were also carried out. In conclusion, the important role of mitochondrial study in radiation biology is underlined, and further study on mitochondrial study associated with late effect and metabolism changes in radiation biology is pointed out.     

偏轴双筒柱电流的磁场

利用双极柱坐标对圆柱电流磁矢量势分布进行变换,给出偏心双筒电流的磁矢量势分布,进而求解了偏心双筒电流在两筒之间的磁感应强度分布.