Complexiton solutions of the （2＋1）-dimensional dispersive long wave equation

In this pager a pure algebraic method implemented in a computer algebraic system, named multiple Riccati equations rational expansion method, is presented to construct a novel class of complexiton solutions to integrable equations and nonintegrable equations. By solving the (2+1)-dimensional dispersive long wave equation, it obtains many new types of complexiton solutions such as various combination of trigonometric periodic and hyperbolic function solutions, various combination of trigonometric periodic and rational function solutions, various combination of hyperbolic and rational function solutions, etc.     

A Light-Cone QCD Inspired Effective Hamiltonian Model for Pseudoscalar and Scalar Mesons

Considering the one-gluon exchange interaction and phenomenological quark confinement potential, an improved light-cone effective Hamiltonian for mesons and the corresponding radial mass eigen equations in angular momentum representation is obtained. Solving the J = 0 eigen equations numerically and using a set of adjustable parameters, the obtained solutions for ground states and radial excited states can simultaneously describe both pseudoscalar and scalar flavour-off-diagonal mesons. Some radial excited states are also predicted and wait for experimental test. More results for the vector and axial vector mesons are expected.     

应用胰凝乳蛋白酶消化法比较冬季和夏季鲢鱼肉肌球蛋白的构造特性

以夏季和冬季鲢为研究对象,利用胰凝乳蛋白酶能水解羧基端含芳香族氨基酸残基肽键的特性,根据其特异性酶切部位,结合电泳手段来分析肌球蛋白的内部构造差异性。结果表明,与夏季样品相比,冬季鲢的肌原纤维蛋白经酶切生成的肌球蛋白头部S-1较长,在高温下分子量为165 ku的重酶解肌球蛋白HMM容易被再降解成小片段的135 ku HMM,呈现出冬季肌球蛋白的结构不稳定性。在不同温度下加热夏季和冬季肌球蛋白,其ATPase失活速度和酶解肌球蛋白生成S-1的产生量的减少速度呈现一致性,说明酶解生成的S-1只来源于有活性的肌球蛋白。同时,冬季肌球蛋白热变性温度较夏季肌球蛋白要低6 ℃,表明冬季肌球蛋白的不稳定性。     

Design and analysis of a novel tunable optical power splitter

A novel tunable optical power splitter,with a Y-branch waveguide based on the total internal reflection and a microprism with tunable index refraction,is presented.Numerical simulation of its optical performance shows that a high dynamic range,low optical loss,and relatively low wavelength-dependence can be achieved.This component offers numerous advantages such as ease for fabrication,low cost,and compact size,which are very useful for potential application in integrated optical devices.     

神龙二号热阴极注入器束流调试

神龙二号注入器是一台感应叠加型强流脉冲电子束源,采用热阴极工作模式,为神龙二号加速器提供间隔可调的三脉冲电子束。该注入器的束流调试采取PIC模拟和实验调试交互验证、互相促进的方式,先是通过束斑测量确定引导线圈磁场的加载范围,然后通过PIC方法逐级梳理阳极段束线各线圈的磁场配置,再通过束斑测量加以确认。通过这种束流调试方法,获得了保持束流脉冲平顶完整通过的三种磁场配置,以适应下游加速段束流传输的不同要求。讨论了影响束流调试效果的因素,认为提升神龙二号注入器性能的关键是进一步改进大面积热阴极发射的均匀性。     

Band offsets engineering at Cd_xZn_(1-x)S/Cu_2ZnSnS_4 heterointerface

Cd_xZn_(1-x)S/Cu_2ZnSnS_4 (CZTS)-based thin film solar cells usually use Cd S as a buffer layer, but due to its smaller band gap(2.4 e V), Cd S film has been replaced with higher band gap materials. The cadmium zinc sulfide(Cd Zn S) ternary compound has a higher band gap than other compounds, which leads to a decrease in window absorption loss. In this paper, the band offsets at Cd_xZn_(1-x)S/Cu_2ZnSnS_4 (CZTS) heterointerface are calculated by the first-principles, densityfunctional and pseudopotential method. The band offsets at Cd_(1-x)Zn_x S/CZTS heterointerface are tuned by controlling the composition of Zn in Cd_(1-x)Zn_x S alloy, the calculated valence band offsets are small, which is consistent with the commonanion rule. The favorable heterointerface of type-I with a moderate barrier height( 0.3 e V) can be obtained by controlling the composition of Zn in Cd_(1-x)Zn_x S alloy between 0.25 and 0.375.     

Solvent effects on the S0→S2 absorption spectra of β-carotene

Absorption spectra of β -carotene in 31 solvents are measured in ambient conditions. Solvent effects on the 0--0 band energy, the bandwidth, and the transition moment of the S₀ → S₂ transition are analysed. The discrepancies between published results of the solvent effects on the 0--0 band energy are explained by taking into account microscopic solute-solvent interactions. The contributions of polarity and polarizability of solvents to 0--0 band energy and bandwidth are quantitatively distinguished. The 0--0 transition energy of the S₂ state at the gas phase is predicted to locate between 23000 and 23600~cm^-1.     

Temperature-dependent specific heat of suspended platinum nanofilms at 80-380 K

Metallic nanofilms are important components of nanoscale electronic circuits and nanoscale sensors. The accurate characterization of the thermophysical properties of nanofilms is very important for nanoscience and nanotechnology. Currently, there is very little specific heat data for metallic nanofilms, and the existing measurements indicate distinct differences according to the nanofilm size. The present work reports the specific heats of 40-nm-thick suspended platinum nanofilms at 80-380 K and ~5×10^-4 Pa using the 3ω method. Over 80-380 K, the specific heats of the Pt nanofilms range from 166-304 J/(kg·K), which are 1.65-2.60 times the bulk values, indicating significant size effects. These results are useful for both scientific research in nanoscale thermophysics and evaluating the transient thermal response of nanoscale devices.     

基于GPU的可视化测量仪器软件设计

提出利用显卡图形处理单元(Graphics Processing Units, GPU)的并行信息处理能力解决仪器软件在执行海量数据处理、建模、渲染以及交互所面临的开销过大的难题,基于DirectX 11的计算着色器(Compute Shader,CS)实现海量测量数据的处理和建模以及高速推送渲染,建立在GPU内实现海量数据模型上点的拾取模块,以提高仪器可视化测量中的交互执行。实验比对证实了基于GPU的可视化测量仪器软件的高执行效率。研究为挖掘可视化测量仪器硬件能力、合理配置仪器CPU与GPU开销、在整体上提高仪器运行效率提供了一条有价值的技术路径。     

纳米混合分子聚集体材料中弗兰克尔激子迁移的相位弛豫

在有机染料ＰＩＣ－１中引入其衍生物ａｚａＰＩＣ－Ｉ形成能量势垒，改变在混合分子聚集体中ＰＩＣ－Ｉ的Ｊ－聚集体的实体长度。用双调制外差检测的累积光子回波技术研究了相干弗兰克尔激子失相过程。观测到激子失相时间Ｔ２随ａｚａＰＩＣ－１克分子数的增大从６０ｐｓ变为２２４ｐｓ。