Near-infrared photodetection with a diruthenium complex having redox-switchable wavelength response

We report on the electrochromic behavior of a dinuclear ruthenium complex, which provides high environmental stability together with an intense absorption maximum at 1237 nm in solution in its +3 oxidation state. To verify its optoelectronic properties, we used this complex as the photoactive material in a planar photodetector prototype for near-infrared light pulses, succeeding in the detection of a train of light pulses at a wavelength of 1280 nm.     

Iterative ultrasonic signal and image deconvolution for estimation of the complex medium response

The ill‐conditioned inverse problem of estimating ultrasonic medium responses by deconvolution of RF signals is investigated. The primary difference between the proposed method and others is that the medium response function is assumed to be complex‐valued rather than restricted to being real‐valued. Derived from the complex medium model, complex Wiener filtering is presented, and a Hilbert transform related limitation to inverse filtering type methods is discussed. We introduce a nonparametric iterative algorithm, the least squares method with point count regularization (LSPC). The algorithm is successfully applied to simulated and experimental data and demonstrates the capability of recovering both the real and imaginary parts of the medium response. The simulation results indicate that the LSPC method can outperform Wiener filters and improve the resolution of the ultrasound system by factors as high as 3.7. Experimental results using a single element transducer and a conventional medical ultrasound system with a linear array transducer show that despite the errors in pulse estimation and the noise in the RF signals, excellent results can be obtained, demonstrating the stability and robustness of the algorithm. © 2006 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 15, 266–277, 2005     

99Tcm标记的邻甲硫基-N-β-巯基乙酰苯胺和硫醇混配复合物的制备及生物分布研究

合成了新的三配位体邻甲硫基-N-β-巯基乙酰苯胺(MTPMA),其结构经红外光谱(IR)、核磁共振(1HNMR)、质谱(MS(FAB+))和元素分析确认.用配体交换方法制备了两种混合配位体复合物99Tcm(L3,L1a)和99Tcm(L3,L1b).其中,L3为三配位体,L1a、L1b分别为单配位体乙硫醇和异丙硫醇.确定了这两种混配复合物的最佳标记条件,在此条件下,放射化学纯度(RCP )＞90%,并且在室温下稳定6 h以上.99Tcm(L3,L1a)和99Tcm(L3,L1b)的小鼠生物分布研究表明两种混配复合物都可通过正常的血脑屏障,并在脑中有一定滞留.     

云南禄丰鸡街碱性超基性岩杂岩体的成因

在研究鸡街碱性超基性岩杂岩体岩石学和地球化学已有资料基础上，认为本区霞霓钠辉岩平均成分加１０％，Ｆ０＝８６的橄榄石可作为杂岩体的原始岩浆，Ｐ２Ｏ５估算出这种岩浆为地幔岩经约３％部分熔融的产物；岩石学混合模拟计算表明，地幔源岩具有明显亏损特征；原始霞霓钠辉岩岩浆经约２９．６％结晶分异形成霓霞岩，霓霞岩岩浆再经约４７．２％结晶分异形成磷霞岩。由此建立起杂岩体的成因模式。     

基于可编程逻辑器件的串行外设接口设计及实现

论述了串行外设接口(SPI)的原理,扩展了多从/多主模式、线与等新功能.用VHDL语言设计了全部源代码,在Max plusⅡ集成开发环境下对VHDL源代码进行编译、综合,并由可编程逻辑器件(CPLD)实现.使SPI接口应用的灵活性得到提高.     

客家土楼中的象征文化浅析

客家土楼以其鲜明的风格成为世界建筑艺术的一朵奇葩,其中蕴含着丰富的象征文化.试从象征的源起及在建筑中的具体体现等方面,对客家土楼中的象征文化进行诠释.通过研究其中的象征文化,有助于更完整地认识客家土楼建筑文化的全部涵义.     

Analytical Model Development for Stokes-Type Settling in a Solidifying Fluid

Analytical modeling was used to track the mudline displacement of a simulated fluid dispersion that underwent a simulated linear increase in the fluid viscosity as a function of time following an induction period. Modeling results indicate two regimes of settling behavior from the driving force of density differences between the particles and the fluid. A linear mudline movement was first determined in the regime of constant viscosity, and a logarithmic retarded mudline movement was numerically determined following a linear rise in fluid viscosity. The results show that the combination of settling and solidification leads to a transitional mudline movement similar to batch settling curves described by early settling theories.     

Synthesis of a Conceptual Model of a Subject Domain. Characteristic Features of Modeling Complex Systems

A solution is given to the urgent problem of high-efficiency control of complex hierarchical distributed integrated industrial complexes by developing a unified functional target approach to synthesizing their control systems utilizing information technologies and the creation of means for constructing a conceptual model of the subject domain.     

摆线轮齿形的组合修正方式及其优化设计

针对齿形已经确定的摆线轮,在修正方式及修正量未知的情况下,利用改进的复合形法对摆线轮齿形修正方式及修正量进行了优化分析．同时,采用工艺过程简单的“等距＋ 移距” 修正方式代替工艺过程较复杂的转角修正方式,使用该方法计算等距和移距修正量速度快,与传统的计算方法相比较,工作效率明显提高．计算结果表明：在摆线轮齿形的各种修正方式中,“正等距＋ 负移距”修正方式是较理想的摆线轮齿形修正方式．这种修正方式具有理想齿形,加工工艺简单,在设计与制造中有一定的推广使用价值