AuSi 液态金属离子源

为了进行Ｓｉ聚焦离子束微细加工技术的研究，研制了ＡｕＳｉ液态金属离子源制备设备及其分析设备，制成了实用化的ＡｕＳｉ合金源，得到了制备该合金源的成熟工艺，利用Ｅ×Ｂ质量分离器分离出Ａｕ和Ｓｉ离子束，对源的一些特性如电流—电压曲线、加热功率—发射电流曲线、束流质谱及源的寿命作了分析。该源结构采取同轴针型，合金槽的材料为钼，发射尖为钨丝。源正常工作时的加热方式为间接加热式。该源与带质量分离器的聚焦离子束系统结合，将迈开亚微米Ｓｉ离子束加工的第一步。并为今后研究其它合金源提供经验。     

10MW 高温堆热气导管振动分析

根据１０ＭＷ高温气冷堆热气导管处于内外两股方向相反气流同时作用的具体结构特点，针对实际设计工况，建立了其流动诱发振动的理论模型，即两端简支，受内外两股方向相反气流同时作用的单管振动模型；给出了相应的数学描述和简捷求解方法；通过计算获得了其振动频率随流速的变化关系，和不同流动工况下，失稳时的临界流速，及相应的稳定性图。分析结果表明，热气导管的设计工况完全处于稳定区内，即其在设计工况下运行时，不会产生大振幅的流致振动。     

高温气冷堆 Fuzzy-Smith 控制系统的仿真研究

结合１０ＭＷ高温气冷实验堆（ＨＴＲ－１０）数学模型的推导和控制系统的设计，介绍解决大延迟系统控制的Ｆｕｚｚｙ－Ｓｍｉｔｈ预估控制器。热工动特性中，堆芯部分用集中参数近似，冷却剂用分布参数处理；蒸汽发生器分为预热段、蒸发段、过热段，建立高温气冷堆的数学模型。扰动量为从额定核功率１００％减小到３０％，调节氦风机的转速和给水流量使主蒸汽出口温度跟随给定值。仿真结果表明，Ｆｕｚｚｙ－Ｓｍｉｔｈ预估控制器兼顾了Ｆｕｚｚｙ控制和Ｓｍｉｔｈ预估控制器的优点，既对延迟特性有较好的补偿作用，又对被控对象参数变化有较强的适应能力，适合于高温气冷堆控制系统设计。     

提高高频晶闸管di/dt耐量的研究

为提高高频晶闸管的动态指标和高频性能，通过实验分析和理论推导，研究了工艺参数和设计参数对高频晶闸管ｄｉ／ｄｔ耐量的影响。实验结果表明：较低的一扩浓度，较薄的基区宽度以及用高能电子辐照控制少子寿命，有利于提高ｄｉ／ｄｔ耐量。通过对相同工艺三种不同阴极图形的８００Ａ、１０ｋＨｚ高频晶闸管ｄｉ／ｄｔ的研究，论证了合理确定辅助晶闸管面积对提高ｄｉ／ｄｔ的重要性，并指出，在大面积高频晶闸管中设计二级放大门极，有利于提高ｄｉ／ｄｔ耐量。     

Distributed Estimation in Sensor Networks with Repetition Coding

This paper considers the distributed estimation of a source parameter using quantized sensor observations in a wireless sensor network with noisy channels. Repetition codes are used to transmit quantization bits of sensor observations and a quasi best linear unbiased estimate is constructed to estimate the source parameter. Simulations show that the estimation scheme achieves a better power and spectral efficiency than the previous scheme.     

Fabrication of High Quality SiGe Virtual Substrates by Combining Misfit Strain and Point Defect Techniques

High quality strain-relaxed thin SiGe virtual substrates have been achieved by combining the misfit strain technique and the point defect technique.The point defects were first injected into the coherently strained SiGe layer through the "inserted Si layer" by argon ion implantation.After thermal annealing,an intermediate SiGe layer was grown with a strained Si cap layer.The inserted Si layer in the SiGe film serves as the source of the misfit strain and prevents the threading dislocations from propagating into the next epitaxial layer.A strained-Si/SiGe/inserted-Si/SiGe heterostructure was achieved with a threading dislocation density of 1×104cm-2 and a root mean square surface roughness of 0.87 nm.This combined method can effectively fabricate device-quality SiGe virtual substrates with a low threading dislocation density and a smooth surface.     

Ruin Probability in Linear Time Series Model

This paper analyzes a continuous time risk model with a linear model used to model the claim process. The time is discretized stochastically using the times when claims occur, using Doob‘s stopping time theorem and martingale inequalities to obtain expressions for the ruin probability as well as both exponential and non-exponential upper bounds for the ruin probability for an infinite time horizon. Numerical results are included to illustrate the accuracy of the non-exponential bound.     

通用NC代码翻译技术

在深入分析了ＮＣ代码特点的基础上，以“订做”方式实现通用ＮＣ代码翻译器。在编译理论和ＮＣ代码特点相结合的基础上，借鉴ＣＡＤ／ＣＡＭ中的模板技术，提出了通用ＮＣ代码翻译器的总体结构，并对翻译器的一些关键实现技术进行了讨论。     

Influence of DC Supply Systems on Unplanned Reactor Trips in Nuclear Power Plants

IntroductionMany factors influence the economics ofnuclear power plants.Unplanned reactor trips arethe most important factors,so it has beeninvestigated from various aspects because oftheirinfluence on the operating capacity factor inNuclear Power Plants ( NPPs ) .Operationalexperience has shown thatsome components in theNPPs are so importantthattheir failure may causethe entire plantto shutdown.Such shutdowns haveoften occurred in the pastin the NPPs.So,nuclearpowerplantauthorities have…     

Spatially Adaptive Subsampling for Motion Detection

Many video surveillance applications rely on efficient motion detection. However, the algorithms are usually costly since they compute a background model at every pixel of the frame. This paper shows that, in the case of a planar scene with a fixed calibrated camera, a set of pixels can be selected to compute the background model while ignoring the other pixels for accurate but less costly motion detection. The calibration is used to first define a volume of interest in the real world and to project the volume of interest onto the image, and to define a spatial adaptive subsampling of this region of interest with a subsampling density that depends on the camera distance. Indeed, farther objects need to be analyzed with more precision than closer objects. Tests on many video sequences have integrated this adaptive subsampling to various motion detection techniques.