25kW氩壁稳电弧离子体LTE性的光谱学实验研究

本文利用光谱学诊断方法对25kW氩壁稳电弧等离子体的LTE性进行了实验研究.结果发现在实验条件下等离子体至少是PLTE的,压力高于0.05MPa、电流大于50A时,基本上是LTE的,谱线半宽度与等离子状态无关,只取决于电子密度.     

Steric effects on diffusion of associated molecules in acetone

The effects due to steric hindrance on solute-solvent interactions and on diffusion of associated molecules were found by comparing the diffusion coefficients of different aromatic isomers in acetone at 298.2 K; there exists a correlation between the isomeric effects of intermolecular association on diffusion and the molecular scales of overall hydrogen-bond acidity of the isomers studied.     

An efficient direct approach for computing shortest rectilinear paths among obstacles in a two-layer interconnection model

In this paper, we present a direct approach for routing a shortest rectilinear path between two points among a set of rectilinear obstacles in a two-layer interconnection model that is used for VLSI routing applications. The previously best known direct approach for this problem takes O(nlog²n) time and O(nlogn) space, where n is the total number of obstacle edges. By using integer data structures and an implicit graph representation scheme (i.e., a generalization of the distance table method), we improve the time bound to O(nlog^3/2n) while still maintaining the O(nlogn) space bound. Comparing with the indirect approach for this problem, our algorithm is simpler to implement and is probably faster for a quite large range of input sizes.     

An Evolving Random Network and Its Asymptotic Structure

In this paper, we propose an evolving random network. The model is a linear combination of preferential attachment model and uniform model. We show that scaling limit distribution of the number of leaves at time $n$ is approximated by normal distribution and the proportional degree sequence obeys power law. The branching structure and maximum degree are also discussed in this paper.     

Investigation on the combustion efficiency and residual of nitrocellulose–alcohol humectant mixtures

To have an insight into the fire properties of nitrocellulose–isopropanol and –ethanol mixtures, the experimental data in previous work are further extracted and analyzed carefully. Generally, the effective heats of combustion of the two samples characterized by both the peak and mean heat release rates decrease with the increasing external irradiance levels. The combustion efficiencies characterized by the ratio of carbon dioxide (CO₂) to carbon monoxide (CO), regardless of the maximum and mean values, also show the similar decreasing tendency, exhibiting a lower combustion efficiency at elevated external radiation. With respect to the X-ray photoelectron spectroscopy results, the two nitrocellulose–alcohol mixtures appear to yield the similar species of combustion residuals, but slightly different in the atomic concentrations, which may be due to the differences in the alcohol humectant and nitrogen content in nitrocellulose substrate. These findings are expected to provide further understanding of fire properties of nitrocellulose–alcohol mixtures and help with fire investigation of such type of fires.

     

Low-cost amplitude mask for long-period grating fabrication

A novel method is presented that use the RZJ-304 positive photoresist to construct an array as amplitude mask to writing long period gratings, and for a protective effect when fabricate aluminum ring array as amplitude mask. Results show that the long period gratings’ transmission spectra are good with different types of processing methods. In this way, the processing methods we demonstrate are suitable for processing long period gratings.     

阴极微凸起形状对热不稳定性的影响

为了研究阴极微凸起形状对其热不稳定性的影响,采用数值模拟方法研究了不同外加电场条件下,圆柱、圆台和圆锥形等不同形状微凸起的热不稳定性发展过程。结果显示:对于不同形状的微凸起,当微凸起顶部温度达到阴极材料的熔点时,微凸起内部温度分布差异显著,随着微凸起形状由圆柱-圆台-圆锥形变化,微凸起内部温度接近材料熔点的部位越来越少;外加电场相同时,微凸起形状越接近圆锥形,爆炸电子发射延迟时间越长;在阴极表面电场强度高于11 GV/m时,爆炸电子发射延迟时间随着微凸起顶底半径比值的减小或阴极表面电场强度的下降近似成指数规律增长。     

Bounds for commutators of multilinear fractional integral operators with homogeneous kernels

We will show bounds for commutators of multilinear fractional integral operators with some homogeneous kernels.     

Enrichment and sensitive detection of polyphenolic compounds via β-cyclodextrin functionalized fluorescent gold nanorods

Microchimica Acta - We report on a simple and rapid method for the enrichment of polyphenolic compounds (pPhCs) by means of gold nanorods whose surface was functionalized with a monolayer of...