光镊捕获和操控尺度极限的进展

光镊技术能够实现对介观乃至微观颗粒的稳定捕获和灵活操控,是对微纳物体和单个分子施加力并观测其响应的理想操控手段。受限于光的衍射极限,传统光镊难以实现对100 nm以下物体的捕获和操控。研究者们通过开发特殊的材料和结构,将它们与传统光镊技术结合,不断突破其在小尺度物体的捕获和操控极限。本文主要综述了近年来光镊的不同技术路线在突破捕获操控极限的研究进展,以及其在物理化学领域中的应用,并对其发展和应用进行展望。     

通过稀土离子和羧酸配体组装成的两种新型的二维配位聚合物的合成、晶体结构及荧光性质

利用水热法合成了两种新型的二维（2D）稀土配位聚合物[Ln(PDC)(OH)(H2O)2]n (Ln = Eu (1) and Tb (2), H2PDC = 3,4-吡啶二羧酸),通过元素分析、红外光谱、热分析和X射线单晶衍射等技术对其进行了表征。单晶结构分析表明这两种配合物都显示出包含有一维Ln-O-Ln链的二维层状结构,层间又进一步通过 π-π 堆积和氢键作用扩展成三维超分子网络结构。此外,这两种配合物的固体在室温下都有强的荧光发射。     

一维化合物[Gd2(PDC)3(phen)(H2O)·H2O]n的合成、晶体结构及热性质

A one-dimensional complex, [Gd2(PDC)3(phen)(H2O) ? H2O]n (H2PDC=pyridine-3,4-dicarboxylic acid, phen =l,10-phenanthroline), has been synthesized under hydrothermal conditions and characterized by elemental analysis, IR, TG analysis, and X-ray single-crystal structure analysis. Crystallographic data for the title complex:C33H21Gd2N5O14, Mr=l 026.05, Triclinic, space group P1, a=0.751 07(15) nm,b=1.256 5(3) nm, c=1.825 7(4) nm, α=70.80(3)°,β=79.00(3)°, γ=76.05(3)°, V=1.567 4(5) nm3, the final refinement gave R =0.022 4 and wR =0.047 5 for The current version does not support copying Cyrillic text to the Clipboard.The current version does not support copying Cyrillic text to the Clipboard.extended to a 3D supramolecular network through H-bonds interaction. CCDC: 671430.     

一类带扰动的随机脉冲泛函微分方程解的渐近性北大核心CSCD

该文讨论了一类带扰动的随机脉冲泛函微分方程解的渐近性.通过比较扰动方程的解和原方程的解,得到了两者逼近的充分条件.首先,两者在有限的时间区间上相互逼近;其次,当扰动趋于零时,区间长度趋于无穷大,在这个区间上两个解仍然是相互逼近的.最后,举例说明了结果的有效性.     

基于3，4-吡啶二羧酸的二维层状聚合物的合成和晶体结构

A metal-organic coordination polymer {[La(PDC)(N-HPDC)]·H₂O}_n (1) (H₂PDC=pyridine-3,4-dicarboxylic acid) has been hydrothermally synthesized and structurally characterized by X-ray diffraction single-crystal structure determination, elemental analyses and IR spectroscopy. The complex crystallizes in the monoclinic system, space group P2₁/c with a=1.452 8(2) nm, b=0.681 59(11) nm, c=1.464 0(2) nm, β=94.270(2)°, V=1.445 6(4) nm³, D_c=2.243 Mg·m^-3, Z=4, M_r=488.14, F(000)=944, μ(Mo Kα)=3.015 mm^-1, R=0.031 0 and wR=0.076 2 for 2 424 observed reflections (I>2σ(I)). There are La-O-C-O-C-La double chains in the complex. The chelating carboxylate O atoms and pyridyl N atoms lead the compound to 2D layers structure, which is extended to 3D supramolecular architecture through intermolecular hydrogen bonds. It is interesting that the polymer containing one-dimensional channels. CCDC: 708868.     

密集波分复用系统中光纤喇曼放大器的分析方法

本文利用耦合波理论分析了密集波分复用系统中具有一定光谱宽度的光信号之间的SRS相互作用规律,给出了宽光谱光抽运的光纤喇曼放大器的分析方法.     

磁悬浮隔振器动态电磁力实验与建模

磁悬浮隔振器的核心部件是电磁作动器,得到其输出电磁力与线圈电流及气隙之间的模型对实现磁悬浮隔振器的主动隔振有着重要的意义.实际系统中,磁悬浮隔振器运动频率对电磁力模型参数有较大影响,为了得到比较精确的符合实际的电磁力模型,对原有模型进行了修正,给出了新的考虑频率因素的修正模型;并且设计了基于MTS809的动态电磁力实验建模方案,直接根据电磁力实时测量数据辨识得到动态电磁力修正模型,而不需要对磁路进行任何假设.实验结果表明,该方法建立的电磁力修正模型更符合实际情况.     

基于3，4-吡啶二羧酸配体的钆(Ⅲ)配合物的合成、晶体结构及热性质

The hydrothermal reaction of pyridine-3,4-dicarboxylic acid (pydcH₂), 4,4′-bipyridine and GdCl₃·6H₂O yield a novel gadolinium coordination polymer {[Gd₂(pydc)₂(μ₃-OH)₂(H₂O)₂]·H₂O}_n(1). The compound was chara-cterized by elemental analysis, thermal analysis, IR spectra and single-crystal X-ray structure analysis. The crystal of the Gd(Ⅲ) complex belongs to triclinic system, space group P1 with: a=0.796 25(16) nm, b=0.944 46(19) nm, c=1.262 1(3) nm, α=76.50(3)°, β=84.95(3)°, γ=83.04(3)°, Z=2, V=0.914 4(3) nm³, D_c=2.669 g·cm^-1, μ=7.269 mm^-1, F(000)=692, and R₁=0.033 3, wR₂=0.062 3. The crystal structure revealed that compound 1 has a 2D layer structure incorporating 1D Gd-O-Gd double chain, and hydrogen bonding interactions result in the former of 3D supramolecular network structure. CCDC: 669079.     

空间域相位调制干涉仪用于微位移测量

本文从波动光学的干涉理论出发，描述了空间域相位调制干涉测量位移的原理。给出干涉仪的系统构成原理。比较空间域相位调制与时间域相位调制的异同点。指出空间域相位调制的特点。提出空间域相位调制干涉仪的两种工作状态，即单条纹和双条纹工作状态。最后给出位移测量结果。