The Enhancement of Efficiency of High-order Harmonic in Intense Laser Field Based on Asymptotic Boundary Conditions and Symplectic Algorithm

Asymptotic boundary condition (ABC) of laser-atom interaction presented recently is applied to transform the initial value problem of the time-dependent Schrödinger equation (TDSE) in infinite space into the initial and boundary value problem in the finite space, and then the TDSE is discretized into linear canonical equations by substituting the symmetry difference quotient for the 2-order partial derivative. The canonical equation is solved by symplectic algorithm. The ground state and the equal weight coherent superposition of the ground state and the first excited state have been taken as the initial conditions, respectively, while we calculate the population of bound states, the evolution of average distance and the high-order harmonic generation (HHG). The conversion efficiency of HHG can be enhanced by initial coherent superposition state and moderate laser intensities     

Low-dimensional hybrid copper halides with novel D6R Cu(6)I(6) cores

Two low-dimensional hybrid copper halides, (2,2'-bipy)Cu(3)I(3) (1) and (2,2'-bipy)Cu(4)I(4) (2) (2,2'-bipy = 2,2'-bipyridine), with novel D6R (double six-membered rings) Cu(6)I(6) cores were synthesized by hydro(solvo)thermal reactions and characterized by single-crystal X-ray diffraction.     

Cr-β沸石的合成与催化性能研究

在SiO₂-Cr₂O₃-(TEA)₂O-Na₂O-H₂O体系中，以四乙基氢氧化铵(TEAOH)为模板剂合成了Cr-β沸石，用XRD、IR、SEM及DTA-TGA等方法对样品进行了表征，探讨了反应混合物组成对Cr-β沸石晶化的影响，初步考查了Cr-β沸石催化苯酚与过氧化氢的羟基化反应活性。     

“哑铃状”偶氮化合物的合成与表征

从分子设计的角度出发, 合成了末端含有两个庞大基团的哑铃状偶氮化合物. 其大的末端基团一方面可以增加顺、反两种异构体之间的能垒, 有利于两种异构体的稳定存在, 另一方面由于大的末端基团的存在, 为采用AFM或高分辨STM直接观测两种异构体分子相的相互转变降低了难度.     

Synthesis and characterization of 1,3,4-oxadiazole derivatives containing alkoxy chains with different lengths

The synthesis, optical properties, electrochemical properties, electronic structures and applications in electroluminescent device of three series of 1,3,4-oxadiazole derivatives, 1,4-bis[(4-methylphenyl)-1,3,4-oxadiazolyl]phenylene (OXD₁), 5,5′-di-(4-methyl)-2,2′-p-(2,5-bisalkoxyphenylene)-bis-1,3,4-oxadiazole (OXD_2–n) and 1,4-bis[(4-alkoxyphenyl)-1,3,4-oxadiazolyl]phenylene (OXD_3–n) are reported. The molecular structures of the oxadiazole compounds were confirmed by FT-IR, ¹H NMR spectroscopy and elemental analysis. The optical and electrochemical properties of the compounds were investigated by UV–vis absorption and photoluminescence spectroscopy as well as cyclic voltammetry. The results show that introduction of two alkoxy groups whose electron-donating ability is stronger than that of methyl groups increases the electron density of the conjugated segment of OXD_2–n (with side-on alkoxy substituents) and OXD_3–n (with end-on alkoxy substituents), and thus leads to the absorption maximum bathochromic-shift compared to that of OXD₁. The HOMO and LUMO energy levels of the compounds studied are in the range of −2.78 to −2.89 and −5.75 to −6.20 eV. Calculations on the representative compounds by the Dmol³ package of MS Modeling 3.0 revealed that the increase of energy levels in both OXD_2–n and OXD_3–n was due to the change of the frontier molecular orbital distribution in the central benzene ring. The light-emitting devices have been fabricated using blends of MEH-PPV and these compounds as emissive layers, among which, maximum brightness up to 11810 cd m⁻² (8.5 V) has been observed, which is 40 times brighter than that with MEH-PPV. The result of the devices suggested that oxadiazole derivatives studied function well as electron-transporting materials and can be used in LEDs, and thus to enhance the efficiency of LEDs.     

碳纤维中的单层石墨物相及其对力学性能的影响

依据碳纤维中各种物相的X射线衍射特性, 确认PAN基碳纤维中除了乱层石墨微晶外, 还存在大量的单层六元环C原子层面物相, 建立起两种非完整结晶物相的定量分析方法. 实验结果表明, 随着退火温度由1350 ℃上升到2400 ℃, Tx-3高强型碳纤维中的单层石墨含量由59.6%下降到34.8%, 乱层石墨含量由40.4%上升为65.2%. 与此同时, 碳纤维的拉伸强度则由3.65 GPa下降到2.05 GPa, 而延伸率也由1.04%下降到0.58%. 并对PAN基碳纤维中单层石墨对其力学性能的影响也进行了初步的探讨.     

可交联聚甲基丙烯酸甲酯的合成、表征及在阵列式波导光栅中的应用

合成了含环氧基团的可交联的甲基丙烯酸甲酯和甲基丙烯酸环氧丙酯的共聚物[Poly(MMA-co-GMA)],通过FTIR,NMR,GPC,DSC和AFM等技术对其进行了表征. 结果表明,所合成的聚合物材料具有较好的成膜性; 通过热固化使引入的环氧基团开环交联,该聚合物的玻璃化转变温度(Tg)比固化前提高了24 K,同时有效地降低了聚合物的双折射率. 用Poly(MMA-co-GMA)作为包层材料,双酚A型环氧化合物作为高折射率材料, 将其引入到包层材料中形成芯层材料的折射率在波长1.55 μm处可调,其范围是1.483~1.588. 采用旋涂、 铝掩膜和氧反应离子刻蚀的方法(RIE)制得了阵列式光波导. 测试结果表明,制作的波导在1.55 μm处实现了光的单模传输,光损小于3.0 dB/cm.      

Expression of Catalytic Domain of Protein Tyrosine Phosphatase 1B and Preparation of Its Polyclonal Antibody

This study focuses on the expression of human protein tyrosine phosphatase 1B(PTP1B) catalytic domain (△PTP1B) and preparation of polyclonal antibody against △PTP1B. △PTP1B gene was PCR amplified with the cDNA of human PTP1B as the template, and cloned into the pT7 expression vector. The recombinant pT7-△PTP1B was expressed in E. coli Rosetta( DE3 ) host cells and purified. The antiserum was prepared by immunizing rabbit with purified recombinant △PTP1B. The polyclonal antibody against △PTP1B was purified by PVDF immobilized antigen affinity chromatography. △PTP1B was correctly cloned, expressed, and purified as confirmed by PCR, DNA sequence ratio) and 0. 1 ng, respectively. This study provides an important basis for further studying the biological function of PTP1B and its relationship with human diseases.     

Synthesis, characterization, photoluminescence and electroluminescence properties of new 1,3,4-oxadiazole-containing rhenium（I） complex Re（CO）3（Bphen）（PTOP）

A new 1,3,4-oxadiazole-contanining rhenium(I) complex,with the formula [Re(CO)_3(Bphen)(PTOP)],(Bphen=bathophe- nardine,PTOP=4-(5-p-tolyl-1,3,4-oxadiazd-2-yl)pyridine),is synthesized and characterized by elemental analysis,IR,~1H NMR, UV-vis and luminescence spectroscopy.The double-layer electroluminescence devices based on the Re(I) complex have been fabricated by spin-coating technique.The turn-on voltage,maximum efficiency,and brightness for green emission obtained from the devices are 9V,2.1cd/A and 165cd/m~2,respectively.     

Multicolor quantum dot-encoded microspheres for the detection of biomolecules

The biocompatible semiconductor quantum dots (QDs) have unique photophysical properties, which provide important advantages over organic dyes and lanthanide probes in fluorescence labeling applications. In this work, multicolor quantum QD-encoded microspheres have been prepared via the layer-by-layer (LbL) assembly approach. Polystyrene microspheres of 3 μm diameter were used as templates for the deposition of different sized CdTe QDs/polyelectrolyte multilayers via electrostatic interactions. Two kinds of biofuntional multicolor microspheres with two different antibodies, anti-human IgG and anti-rabbit IgG were prepared. Human IgG and rabbit IgG can be detected as target antigens in the multiplexed fluoroimmunoassays. Furthermore, a novel microfluidic on-chip device was developed to detect two kinds of antigen-conjugated multicolor QD-encoded microspheres; the microspheres can be distinguished from each other based on their fluorescence signals.