基于DSP的新一代液晶光电图形发生器

液晶光电图形发生器选用先进的液晶显示器件,在计算机的控制下可根据实际测量的需求产生出各种所需的目标图形。针对第一代光电图形发生器数据传输速度过慢等问题,研制了新一代基于DSP的光电图形发生器,采用通用异步接收/发送通信外设的接口方式,通过高性能DSP与FPGA进行图形传输,利用专用的液晶驱动芯片完成图形显示。结果表明,该装置提高了传统光学测量中对目标更换的效率和图形传输速度,实现了从目标到探测的全光电化测量。     

基于数字图像处理方法的焦距测量技术研究

介绍了基于数字图像处理方法测量透镜焦距的玻罗板分划线快速自动甄别法。该图像处理方法鲁棒性好,采用Canny法进行分划线边缘检测。用重心法计算所有线条的重心,从重心往两边搜索线条,判断选取间隔大的刻划线对,可以提高测量精度。实验数据表明该方法的相对测量不确定度能达到8.5×10-4。为实现以数字图象处理为基础的焦距客观测量提供了一种可行的技术途径。     

高压烧结法合成致密纳米BaTiO3陶瓷结构和铁电性能研究

 在6 GPa压力、1 000 ℃温度条件下制备了致密的纳米BaTiO₃陶瓷，合成样品的平均晶粒尺寸为50 nm，理论密度在97%以上。通过介电测量，观察到了样品宽化的相变峰，它与粗晶陶瓷的相变峰大不相同。由于90°电畴的减少和退极化场的存在，观察到了细长的电滞回线，它是样品铁电性存在的有力证据，表明钛酸钡陶瓷的临界尺寸在50 nm以下。     

Probabilistic Controlled Teleportation of a Triplet W State

A scheme for probabilistic controlled teleportation of a triplet W state from the sender Alice to the distant receiver Bob is proposed. In this scheme, an m-qubit GHZ state serves as the control parameter. The m control qubits are shared by m（s1, s2… sm） spatially-separated supervisors. With the aid of local operations and individual measurements, including Bell-state measurement, Von Neumann measurement, and mutual classical communication, etc., Bob can faithfully reconstruct the original state by performing relevant unitary transformations. However, even if one participant does not cooperate during the process, the receiver Bob cannot fully recover the original state. This protocol can be extended to probabilistic controlled teleportation of an arbitrary N-qubit state and some other N-qubit entangled states.     

AN INVESTIGATION ON THE INTERACTION MECHANISM OF β-CAROTENE WITH HALOGEN ATOM PRODUCED IN HALOBENZENE BY UV IRRADIATION

ESR measurements using spin trapping technique werecarried out for β-carotene-halobenzene system under UV lightirradiation.The ESR spectra observed in the presence andin the absence of β-carotene are markedly different.Thepossible scheme of β-carotene interacting with halogen atomwas proposed.     

Borax-catalyzed thiolysis of 1,2-epoxides in aqueous medium

A convenient, economical, and practical protocol for borax-catalyzed thiolysis of 1,2-epoxides in aqueous medium has been developed, which has greatly expanded the utility scope of borax in organic synthesis.     

锂离子电池Si@void@C复合材料的制备及其电化学性能

以纳米Si颗粒为核心,正硅酸四乙酯(TEOS)为SiO_2源,采用Stober法在Si表面包覆一层SiO_2,再以多巴胺为碳源,通过碳化处理将SiO_2表面的聚多巴胺层转化成碳层。最后,用HF刻蚀SiO_2并留下空隙,得到Si@void@C复合纳米颗粒。利用X射线衍射、扫描电镜、透射电镜和恒流充放电测试对材料的物相、微观形貌和电化学性能进行表征。结果表明,在0.1 A·g~(-1)电流密度下,Si@void@C负极材料充放电循环100次后充电比容量仍然有1 319.5 mAh·g~(-1),容量保持率为78.4%,表现出优异的电化学性能。     

m-Ferrocenylbenzoate-bridged lanthanide coordination polymers: Syntheses, structures, electrochemical and magnetic properties

A series of m-ferrocenylbenzoate [m-ferrocenylbenzoate = m-NaOOCH₄C₆Fc, Fc = (η⁵-C₅H₅)Fe(η⁵-C₅H₄)] lanthanide coordination polymers, namely [Ln(μ₂-OOCH₄C₆Fc)(η²-OOCH₄C₆Fc)(μ₂-η²-OOCH₄C₆Fc)(CH₃OH)₂]_n [Ln = La (1), Pr (2), Nd (3), Sm (4) and Gd (5)], have been synthesized by reactions of m-ferrocenylbenzoate with Ln(NO₃)₃·nH₂O. X-ray crystallographic analyses reveal that 1, 2 and 5 are essentially isostructural with unique one-dimensional linear chain structure. Three types of coordination modes for m-ferrocenylbenzoate are observed in the unit structure which consists of the eight-membered metallacycle Ln₂(COO)₂ and the rhomboid Ln₂O₂. Electrochemical studies indicate that 1-5 exhibit a reversible redox wave of Fe^II/Fe^III and the half-wave potentials of 1-5 are slightly more positive than that of m-ferrocenylbenzoic acid. Magnetic investigations show that an antiferromagnetic interaction between Gd(III) ions exists in 5.     

A New Supramolecular Compound Based on Cd（II）-Schiff-base and Keggin-type [PMo_（12）O_（40）]~3

A new supramolecular compound, {[Cd(L)2]2[PMo12O40NO3]·CH3CN·2H2O}n 1 (L is 1,4-bis(4-imidazolyl)-2,3-diaza-1,3-butadiene), based on Cd(II)-Schiff-base and Keggin- type [PMo12O40]3- was synthesized via self-assembly and structurally characterized by elemental analysis, infrared spectroscopy, and single-crystal X-ray diffraction analysis. The crystal is of triclinic, space group P1 with a = 12.0128(11), b = 13.6196(13), c = 13.9995(13) , α = 103.868(2), β = 95.225(2), γ = 101.024(2)°, V = 2160.0(3) 3, Z = 1, C34H39N26O45Cd2Mo12P, Mr = 2938.96, Dc = 2.259 g/cm3, μ = 2.276 mm-1, F(000) = 1400, the final R = 0.0565 and wR = 0.1613 for 4973 observed reflections with I 2σ(I). The crystal structure can be described by the packing of Keggin anionic and Metal-Schiff-base cationic layers.     

Output mode characteristics of an in-phase locked gain waveguide array CO2 laser

In this paper,experimental and theoretical studies of the output mode characteristics of an in-phase locked gain waveguide array CO 2 laser are reported.The experimental results of the optical oscillation mode frequency,the far-field intensity distribution and the burnt pattern of the sliced waveguide array laser are obtained.A revised mode expression of the rectangle waveguide,which is suited for this waveguide array CO 2 laser,is proposed.The theoretical simulation results based on the revised mode expression are shown to be in good agreement with the experimental results.