多维度单分子成像研究进展

单分子成像方法被广泛应用于亚细胞结构的三维空间定位。点扩散函数是分析单分子信息的重要窗口,除了能反映空间坐标外还蕴含着丰富的额外信息。本文介绍了从点扩散函数中解析空间位置、荧光波长、偶极子朝向及干涉相位等多维度单分子成像研究进展,简要地概括了目前主流定位方法,并对该技术的发展方向进行了展望。     

Tuning circular Bragg phenomenon of TiO2 sculptured thin films with chiral structure

TiO2 chiral sculptured thin films （CSTFs） prepared using glancing angle deposition （GLAD） method based on electron beam evaporation are studied. The relationship between structural parameters and circular Bragg phenomenon （CBP） is investigated. Results demonstrate that, the central wavelength of Bragg regime red-shifts with the increasing pitch of helix, and peak value of selective transmittance will increase after adding more turns to the helix. After annealing, the central wavelength blue-shifts and the peak value rises. Tuning CBP by modulating the deposition parameters and annealing can optimize the performance of circularly polarized devices fabricated from CSTFs.     

描述高自旋体系的密度算符方法

提出了一种描述高自旋弱偶合体系NMR实验谱的密度算符方法,给出了高自旋体系密度算符在自旋偶合作用下的演化公式。以氘核(²D)为例,计算了重聚INEPT和同核COSY实验谱。     

基于物理课堂有效教学的策略浅析

根据有效教学的理念提出了课堂有效教学的基本策略、动力策略和长效策略,并结合基础物理的教学,对这些教学策略的科学掌握和运用进行了探讨.     

Design and Application of a Near Field Microwave Antenna for the Spin Control of Nitrogen-Vacancy Centers

Controlled manipulation of the electron spin by means of a microwave field is investigated. The near magnetic field generated by a copper wire antenna is measured experimentally and simulated theoretically, and the optimum antenna length and position are obtained. By measuring the change in the fluorescence of nitrogen-vacancy （N-V） centers in diamond after excitation with a 532 nm continuous wave laser at room temperature, it is verified that the spin of the N-V center can be effectively controlled by the microwave field.     

4,5-二氮杂芴-9-酮2-萘甲酰腙(HL)及其配合物PbL_2的NMR研究(英文)

本文报道了 4 ,5 二氮杂芴 9 酮 2 萘甲酰腙 (HL)及其配合物PbL2 的合成及其1H和1H 1HCOSYNMR表征 .在PbL2 中配体以烯醇式配位 ;由于受到亚胺氮孤对电子的屏蔽 ,二氮杂芴环上的质子具有不等价性     

藏药冬虫夏草的近红外光谱分析及品质鉴定

近红外技术具有快速、准确、无损等优势,已在较多领域中得到广泛的应用,如水果品质检测、农产品和食品成份检测,还用于定性分析药材中的化学成分等。该研究采集30个来自不同产地、品级的虫草样品(那曲、玉树、林芝各10个),利用多种光谱预处理方法,结合化学计量法,对冬虫夏草进行了红外光谱分析,从而实现了对样品的快速测定。最终建立了“SG平滑+2阶求导”和“1 001～1 500 nm”组合的虫草分析模型,结果表明,那曲和林芝的虫草品质相近。     

双齿配位过渡金属化合物化学——Ⅲ.钒的邻巯基苯酚配合物的顺磁谱研究

测定了二个顺磁性化合物(Ph_1P)[V_2(mp)_6](Ⅰ)和(Ph_4P)_2[NaV(mp)_3 (MeCN)(MeOH)](Ⅱ)(H_2mp=邻巯基苯酚,o-HO_1C_6H_4SH)的固态和/或溶液中的顺磁波谱。(Ⅰ)的77K固态谱及(Ⅱ)的室温固态谱均经模拟计算,认为它们的钒原子处在S=l/2的Ⅰ=7/2状态,(Ⅱ)的低温(77K)溶液谱(乙腈)与Ⅱ的固态谱相同,均有特征的八条精细结构,认为非配对电子基本上定域在钒原子的周围。     

Coherence-Like States of Two Coulomb-Correlated Ions Confined in a Paul Trap

We report the n x n＇ coherence-like state solutions in the cases of n, n＇ = 1, 2,... for the system including two Coulomb-correlated ions confined in a one-dimensional Paul trap with a time-dependent harmonic potential. One of the n＇ exact solutions of the centre-of-mass motion describes a generalized coherent state. For a small driving strength the n approximate solutions of relative motion are constructed, which describe the coherent oscillations of the two ions around the classical equilibrium position.     

拉曼效应对负折射介质中超短脉冲传输的影响

通过数值法对包含拉曼延迟响应的(3+1)维非线性薛定谔方程进行求解,研究了超短脉冲激光在负折射介质中传输时拉曼效应对自聚焦传输特性的影响,着重分析其不同与常规介质的反常传输现象.结果表明:由于负的折射率影响,拉曼效应将导致超短脉冲在自聚焦过程中频谱发生蓝移现象,这与常规介质对应情形相反;而它对负折射介质中超短脉冲的自聚焦特性的影响与常规介质相同,即拉曼效应将诱导自聚焦效应首先发生在脉冲的前沿.本文研究工作对将来利用负折射介质来操控超短光脉冲串产生、自聚焦等许多实际应用领域研究具有重要的指导意义.