基于模糊逻辑的红外相机模拟器定量化仿真度评价框架(英文)

针对红外相机模拟器仿真度量化评价体系的现状,提出了一种基于模糊逻辑和模糊集思想的全新的理论框架.该框架是一种客观的、多尺度的评价体系,涉及到模糊逻辑、曲线相似度评价、图像质量评估以及信息论等多个交叉领域.和现有的单一尺度的评价方法相比,这种多尺度的仿真度评价分析系统综合考虑了成像系统的主要性能特性参量和系统输出图像的质量,具有更好的任务适应性,可以方便地量化和比较具有相同或相似需求的相机模拟器的仿真度结果.     

纳米增强型毛细管酶柱用于葡萄糖液滴生物传感器的研究

葡萄糖的检测在临床医学以及食品工业等领域中十分重要.以往的检测方法主要包括化学发光法_{[1]、吸光光度法[2]、电化学法[3]和荧光法[4]等.固定化酶柱的制作是发展葡萄糖传感器的关键技术之一.传统的固定化方法主要是将具有生物活性的酶通过物理吸附、共价键合和交联的方法固定于载体基质上或包埋于有机聚合物的基质中.近期研究[5,6]表明,采用溶胶凝胶(Sol-gel)法将蛋白质和酶等生物活性物质包埋于无机陶瓷或玻璃材料内,保持生物组分的活性,且SiO2作为基质材料具有较好的坚固性、抗磨性、化学惰性以及高的光稳定性和透过性,但目前该法多用于电化学型生物传感器[7,8].本文利用纳米颗粒的比表面积大和吸附能力强等特点,将酶吸附在SiO2纳米颗粒表面,用易成膜的聚乙烯醇缩丁醛(PVB)作辅助基质在毛细管上固定酶,并采用分立式酶柱,克服了以往混合型酶柱普遍存在的酶促效率不高和使用寿命较短的局限性.所制得的酶柱具有表面反应活性高、表面活性中心多和催化效率高等特点.结合自行设计的液滴光化学传感装置[9,10],建立了一种高效、快速、微量的葡萄糖实时检测方法.}     

Enthalpies of adsorption of metal atoms on single-crystalline surfaces by microcalorimetry

The heats of adsorption of metal gas atoms onto single crystalline surfaces can be measured directly as a detailed function of coverage using a unique microcalorimeter. The development of this experimental apparatus and the results obtained from these experiments will be reviewed. The heat detection is performed with a highly sensitive pyroelectric polymer ribbon pressed into contact with the thin (1 μ m thick) single crystal sample, onto which pulses of a metal atom beam impinge. Heats of adsorption have been measured for pulses of gas containing a few per cent of a monolayer with a pulse-to-pulse standard deviation as low as 1.5 kJ · mol ^− 1. The adhesion energy of multilayer metal films can be estimated from the integral enthalpy of adsorption.     

Phase Diagram of One-Dimensional Bosons in an Array of Local Nonlinear Potentials at Zero Temperature

The Gaussian wave functional method is applied to a boson system with an array of local nonlinear potentials cos[βφ(nR)] to study the phase diagram of its ground state. The stable ground state is determined by the renormalized mass μ which is a function of the parameter γ=β²/4φ, the strength of potential α and the potential concentration c. In different cases γ<γ₁, γ₁<γ<γ₂ and γ>γ₂, μ can have different multiplicities, the phase diagram in parameter space is thus depicted. The value γ=γ₁ depends on the concentration c, for c→0, it coincides with that of the single impurity model; while γ₂=2 coincides with the conclusion of the continuous model.     

Doping effect on the third-order optical nonlinearities of C70

The substitute doping effect on the third-order optical nonlinearities, characterized by the second-order hyperpolarizabilities γ, of C₇₀ is studied by substituting one carbon atom of C₇₀ with a boron or nitrogen atom. It is found that the substitute doping increases the γ magnitude of C₇₀, which is important for photonic application.     

Iterative Positive Solutions to Nonlinear $q$-fractional Differential Equations with Integral Boundary Value Conditions

This paper is concerned with the existence of positive solutions to nonlinear $q$-fractional differential equations yielding to the integral boundary value conditions. Under sufficient conditions of the nonlinearity, by using some iterative techniques, we get that this problem has two positive solutions and a unique positive solution respectively. Our results improve some recent work.