Effect of Finite Rise Time on the Strength of the Magnetic Field Generated in a Switched Plasma

The effect of a magnetized transient plasma on a circularly polarized source wave, when the rise time of the electron density profile is comparable to the source wave period, is considered. The H-formulation Green's function is developed to study the effect of a finite rise time on the generation of a wiggler magnetic field.     

Langmuir probe and spectroscopic studies of RF generated helium-nitrogen mixture plasma

This paper reports the effect of helium percentage variation in a capacitive RF helium-nitrogen mixture plasma on various plasma parameters and concentration of nitrogen active species (N₂(C³Π _u) and N₂ ⁺(B²Σ _u ⁺)). Langmuir probe is used for determination of electron energy distribution functions, effective electron temperature, plasma potential and electron density. Optical emission spectroscopy is used for determination of electron temperature from Boltzmann's plot of He–I lines and the relative changes in the concentration of active species by measuring the emission intensities of nitrogen (0-0) bands of the second positive and the first negative systems. The results demonstrate that electron temperature, electron density and concentration of active species increase significantly with increase in helium percentage in the mixture and RF power.     

时域荧光分子层析图像重建的线性特征数据法

通过扩展用于时域扩散光成像(Diffuse Optical Tomography, DOT)的广义脉冲谱技术,提出了一种用于时域荧光分子层析成像(Fluorescence Molecular Tomography, FMT)的线性特征数据图像重建算法.此算法能够同时重建荧光产率和荧光寿命,并且利用模拟数据对此方法进行验证,证明了算法的有效性.     

Segmented HPGe detectors for the search of neutrinoless double beta-decay

Neutrinoless double beta-decay (0vbb-decay) is the most promising approach to distinguish between the possibilities of a Dirac or a Majorana nature of neutrinos. Additionally, a measurement of the half-life of 0vbb-decay can give information on the absolute mass scale of neutrinos. At the moment HPGe detectors yield the most sensitive limits on this Lepton-number violating process. The segmentation of HPGe detectors increases the experimental sensitivity by allowing the reconstruction of event topologies. The successful operation of prototype detectors submerged in cryoliquid demonstrates the viability of this experimental approach.     

PCS颗粒测量技术中的累积分析方法研究

采用Levenberg-Marquardt法对累积分析方法中初始值的选择问题进行了分析和研究,并采用此方法对50 nm,100 nm,200 nm,300 nm,500 nm的标准聚苯乙烯乳胶颗粒的实测数据进行了拟合,通过与传统的累积分析法拟合结果对比,采用Levenberg-Marquardt法改进的累积法不但可以给出稳定的颗粒粒径,而且减小了拟合结果的误差.     

Effect of radiofrequency on the sheath-plasma resonance in a low-density plasma

Summary Bohm's theory on plasma probes has been modified, by taking into account the effect of the applied RF voltage on the ion saturation current, for explaining the experimentally detected behaviour of the plasma sheath resonance frequency in a low-temperature and low-density plasma

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Riassunto La teoria di Bohm sulle sonde nei plasmi è stata modificata, tenendo conto dell'effetto dovuto alla tensione RF applicata sulla corrente ionica di saturazione. Si spiega cosi l'andamento della frequenza di risonanza plasma-guaina ionica, rilevato sperimentalmente, in un plasma a bassa temperatura e bassa densità.

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Резюме Предлагается модификация теории Бома для плазменных зондов, которая учитывает влияние приложенного радиочастотного напряжения на ионный ток насыщения. Предложенная модификация позволяет объяснить экспериментально обнаруженное поведение резонансной частоты плазменной оболочки при низкой температуре и при низкой плотности плазмы.

     

反应显微成像谱仪动量及能量分辨因素分析

在对反应显微成像谱仪的工作原理作简要介绍的基础上,全面分析了各种可能影响动量分辨的因素,并结合反应显微成像谱仪的技术参数分别对反冲离子动量分辨以及电子动量与能量分辨进行了详细计算和讨论,确定了反应显微成像谱仪的动量及能量分辨,并为进一步提高分辨提供了重要依据. 关键词： 动量分辨 能量分辨 反应显微成像谱仪 动量成像原理     

Banach空间中关于(H,η)增生算子的变分包含问题

在Banach空间中引进了一类(H,η)增生算子,利用预解算子技巧,建立了一个Ishikawa迭代,并证明了此迭代算法产生的变分包含的解的存在与唯一性。其结果是近期相关结果的改进与推广。     

Analysis of the characteristics of a two-fiber sensor for monitorship of a turbid medium

Summary Certain characteristics of a two-fiber sensor device, of the type proposed by Papaet al. for sea water turbidity monitorship, are examined. The extension of medium from which most of the received backscattered power originates is investigated, together with possible effects of multiple scattering on the received power. Laboratory measurements testing the results of the analysis are reported.

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Riassunto Sono esaminate alcune caratteristiche di un sensore a due fibre, del tipo di quello proposto da Papaet al. per il monitoraggio della torbidità dell'acqua di mare. è stata studiata l'estensione della zona del mezzo da cui proviene la maggior parte della radiazione retrodiffusa ricevuta. Sono stati considerati effetti di diffusione multipla. I risultati dell'analisi sono stati controllati con misure in laboratorio.

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Резюме Исследуются некоторые характеристики дву-qh-нитевого датчика, предложенного Папа и др. для мониторирования мутности морской воды. Исследуется расширение зоны в среде, из которой формируется основная часть рассеянного назад излучения. Также рассматриваются эффекты многократного рассеяния. На основе лабораторных измерений проводится проверка результатов анализа.

     

基于面向对象技术的多媒体CAI素材库系统

建立实用、高效的多媒体ＣＡＩ素材库是高效率、高质量开发ＣＡＩ软件的基础和关键．本文从数据模型、面向对象分析和存储模式三方面入手,提出一种支撑ＣＡＩ制作工具的素材库体系结构,并讨论该体系结构的特性和进一步研究的问题．