Measurements of Absorption and Anisotropy Coefficients of the Fat Emulsion Intralipid-10%

We report measurements of absorption and anisotropy coefficients of the fat emulsion Intralipid-10%. An addingabsorber method is used for measurement of absorption and anisotropy coefficients of the Intralipid-10%. Using the diffusion theory which has been extended to include anisotropy scat geometry, we found that the standard deviations of multiple measurements for√μα/D are less than 0.6% and the residuals between the measured data and the fits have rms values of 0.1%, where μα is the absorbing coefficient of the solution in our experiment and D is the diffusion coefficient of the medium. The values of the standard deviations and the residuals demonstrate the high precision of the measurements.     

Synthesis and Characterization of TiO2 Doped ZnO Microtubes

以氯化锌和硫酸钛为原料,通过湿化学法成功制备了钛掺杂氧化锌微米管. 以粉末X射线衍射仪、场发射扫描电子显微镜、光致发光系统对样品进行了表征. 结果表明,未经掺杂的氧化锌微管具有良好的六方中空结构. 在TiO₂/ZnO比率小于5%时,钛掺杂和未掺杂氧化锌管具有相近的尺度,外表光滑,近于圆柱形. 当TiO₂/ZnO比率大于5%时,生成一种由ZnO, Ti₃O₅和TiO组成的多相混合物. 钛掺杂氧化锌在光催化降解甲基橙溶液效果明显.     

Energy fluctuation and correlation in Tsallis statistics

We investigate the fluctuation of the energy in the framework of Tsallis statistics and find the correlation plays an important role in energy fluctuations. In Tsallis statistics, the correlation is induced by the nonextensivity of Tsallis entropy and exists between particles even if the particles are dynamically independent. By taking the generalized ideal gas as an example, we get that when the particle number N is large enough, the relative fluctuation of the energy is proportional to 1/N instead of in Boltzmann statistics. Thus, the relative energy fluctuation is much smaller in Tsallis statistics than that in Boltzmann statistics. Besides, we demonstrate that the introduction of correlation between particle energies leads to smaller energy fluctuations in Tsallis statistics.     

Optimal stopping of a Brownian bridge with an unknown pinning point

The problem of stopping a Brownian bridge with an unknown pinning point to maximise the expected value at the stopping time is studied. A few general properties, such as continuity and various bounds of the value function, are established. However, structural properties of the optimal stopping region are shown to crucially depend on the prior, and we provide a general condition for a one-sided stopping region. Moreover, a detailed analysis is conducted in the cases of the two-point and the mixed Gaussian priors, revealing a rich structure present in the problem.     

基于迁移学习的GH159螺栓热镦后头部缺陷识别

为准确进行GH159螺栓热镦后头部缺陷识别,提出了基于迁移学习的缺陷识别方法,其中,不同场景亮度下的数据集分别设置为迁移学习的源域,目标域.首先,考虑域条件分布的多簇特点,使用K-means算法对同类缺陷数据进行簇划分,确定簇中心,并基于其构造新的分布差异度量;其次,为有效提升迁移学习计算效率,使用簇中心间距离以及各簇...     

Cascaded electron transition in CuWO_4/CdS/CDs heterostructure accelerating charge separation towards enhanced photocatalytic activity

CuWO_4,as an n-type oxide semiconductor with a bandgap of 2.2 eV,has stimulated enormous interest as a potential broad-spectrum-active photocatalyst for environmental pollution remediations.However,rapid charge recombination greatly hinders its practical applications.Herein,we present a cascaded electron transition pathway in a ternary heterostructure consisting of CdS quantum dots,carbon dots(CDs) and CuWO_4 hollow spheres,which proves to greatly facilitate the photogenerated electron-hole separation,and eventually boosts the degradation efficiency of phenol and congo red by 100% and 46%compared to bare CuWO_4.The enhanced performance of the CuWO_4/CdS/CDs heterostructure mainly originates from the unidirectional electron migration from CdS to CuWO_4 and then to the organics through CDs.This work elucidates the electron transfer kinetics in multi-phase system and provides a new design paradigm for optimizing the properties of CuWO_4 based photocatalysts.     

An efficient projection-type method for monotone variational inequalities in Hilbert spaces

Numerical Algorithms - We consider the monotone variational inequality problem in a Hilbert space and describe a projection-type method with inertial terms under the following properties: (a) The...     

Output regulation distributed formation control for nonlinear multi-agent systems

In this paper, the distributed formation control problem for multi-agent systems with affine nonlinear dynamic is considered. In order to solve the problem, we generalize the output regulation problem of nonlinear systems to multi-agent systems and design a distributed control scheme. Based on the internal model principle, the distributed output regulation formation control problem can be solved by solving the regulator equations. Moreover, the simulation example is provided to demonstrate the effectiveness of the main results.     

Synthesis and crystal structure of an infinite double- stranded chain manganese(II) coordination polymer bridged through 1,2-bis(imidazol-1-yl)ethane ligand

The manganese complex [Mn(bim)₂(NCO)₂]_n (1) (bim = 1,2-bis(imidazol-1-yl)ethane) has been synthesized and structurally characterized by X-ray diffraction analysis. It crystallizes in the monoclinic space group C2/c, a = 9.896(3) Å, b = 15.383(4) Å, c = 13.949(4) Å, β = 98.966(5)^∘, V = 2097.5(9) ų, Z = 4. The coordination geometry of Mn(II) atom is distorted octahedral; it is coordinated equatorially by four nitrogen atoms from the imidazole rings of four symmetry-related bim ligands, and axially by two nitrogen atoms from two symmetry-related cyanate anions. The structure is polymeric, with 18-membered spiro-fused rings and each 18-membered ring involving two inversion-related bim molecules.