Exploring Feasibility for Application of Luminescent CdTe Quantum Dots Prepared in Aqueous Phase to Live Cell Imaging

Due to the quantum confinement, semiconductor quantum dots (QDs) show some unique and fascinating optical properties, such as, sharp and symmetrical emission spectra, high quantum yield (QY), good chemical and photo-stability. These excellent optical prop…     

多色焦平面和图像融合SoC实现技术的研究

大规模、智能化的多色焦平面阵列探测器和高性能、高集成度的SoC技术是未来发展的方向。对多色焦平面的概况、发展和关键技术进行了分析。为了能够更有效的利用信息,把由多色焦平面探测器输出的,并经天然配准的各波段图像进行了融合处理。详细介绍了现有的多种图像融合算法、模型、SoC和高速处理硬件平台的研究情况以及若干新进展。     

Z-pinch内爆等离子体时空分辨诊断技术

 为了深入认识和理解Z-pinch物理机制并对物理实验进行优化设计，需要研究内爆等离子体及其辐射的时空分布特性诊断技术，建立诊断装置与设备，通过实验研究等离子体内爆时间过程及其空间分布特性，利用所获得的实验诊断数据校核数值模拟程序。简要介绍近几年开展的X光空间积分功率谱测量、X光时间积分针孔照相、X光时分幅针孔照相、X光时间分辨1维空间分布、紫外探针阴影照相等时空分辨诊断技术研究工作，并给出在1~3 MA电流驱动装置上进行的喷气和丝阵内爆实验中获得的部分时空分辨诊断结果，包括辐射功率、拉链速度、内爆速度、收缩比等。     

氧燃烧方式下矿物质与重金属行为特征的研究

在沉降炉试验台上,进行空气气氛及O2/CO2气氛燃煤试验,通过X射线衍射分析和ICP-AES分析研究了不同气氛下煤灰中矿物质组成及痕量元素的挥发特性.并根据热力学多相平衡原理对矿物质与重金属在两种气氛下的挥发行为进行了计算和比较分析.结果表明,氧燃烧气氛下的矿物质组成与空气气氛下并无明显不同,矿物质元素的蒸发气化亦没有受到明显的影响,但在氧燃烧气氛下矿物质的晶相向非晶相的转化得到了较大改善,有可能使电站锅炉沉积得到缓解;氧燃烧气氛下灰中痕量元素相比空气气氛下在底灰中有明显的富集.     

关于"双棱镜必须均匀照亮"的深入探讨

讨论了菲涅耳双棱镜实验中，双棱镜“必须均匀照亮”的意义，并强调指出，只要双棱镜的中心(棱脊的附近)被“均匀照亮”即可，从而对教材中的“均匀照亮”的含义作了明确的界定．     

Size dependence of the luminescence spectra of nanocrystal alumina

A nanometer-sized Al₂O₃ powder was prepared by calcination of the nanometer-sized boehmite powder at different temperatures for 3 h in air. The main absorption bands located at about 200, 236, 255, 334 and 348 nm always occur in any phase of nanometer-sized alumina powder, and also do not change with the particle size. The luminescence bands at 404 nm in nanometer-sized alumina powder are presented under 236 and 254 nm excitation, respectively. The luminescence intensity of peak located at 404 nm decreases quickly with the increasing alumina powder size. It is suggested that the defect level in the nanometer alumina powder should be taken into account for the mechanism of new luminescent emission bands.     

从第二类梯度算子和第二类积分定理到Gauss（球面）映射不变量

将第二类梯度算子、第二类积分定理、Gauss曲率相关的积分定理和Gauss（球面）映射相结合,证明了一系列Gauss（球面）映射不变量．从这些不变量中,得到一系列从原始曲面到（Gauss单位）球面的变换．这些不变量和变换,在几何学、物理学、生物力学和力学中,都有潜在的用途．     

新椭球的一些性质

首先讨论了当多胞形的新椭球是球的充要条件,然后对算子Gamma(-2)的性质进行了探讨,得出了一些相关的不等式．     

Hamilton weights and Petersen minors*

A (1, 2)‐eulerian weight w of a cubic graph is called a Hamilton weight if every faithful circuit cover of the graph with respect to w is a set of two Hamilton circuits. Let G be a 3‐connected cubic graph containing no Petersen minor. It is proved in this paper that G admits a Hamilton weight if and only if G can be obtained from K₄ by a series of Δ?Y‐operations. As a byproduct of the proof of the main theorem, we also prove that if G is a permutation graph and w is a (1,2)‐eulerian weight of G such that (G, w) is a critical contra pair, then the Petersen minor appears “almost everywhere” in the graph G. © 2001 John Wiley & Sons, Inc. J Graph Theory 38: 197–219, 2001