生长系统对高阻区熔硅单晶径向电阻率变化的影响

分别采用L4375-ZE区熔炉和CFG/1400P区熔炉,生长了N型、(1.5～4.5)×103Ω.cm和P型、(1.0～5.0)×104Ω.cm两种规格的高阻区熔硅单晶,单晶的直径为52～54 mm,晶向为<111>。经对单晶的电阻率及其径向分布进行检测对比后发现,在加热线圈几何结构(包括上下表面角度、内径尺寸及台阶设计)基本相同、单晶生长速率相同且上、下晶轴旋转具有相同配置的情况下,不同的单晶生长系统所生长的单晶,其电阻率径向均匀性有明显差异,用L4575-ZE区熔炉生长的单晶的电阻率径向分布更均匀。     

Efficient visual object detection with spatially global Gaussian mixture models and uncertainties

In this paper, we deal with the problem of visual detection of moving objects using innovative Gaussian mixture models (GMM). The proposed method, the Spatially Global Gaussian Mixture Model (SGGMM) uses RGB and pixel uncertainty for background modelling. The SGGMM with colours only is used for scenes with moderate illumination changes. When combined with pixel uncertainty statistics, the method can deal efficiently with dynamic backgrounds and scene backgrounds with fast change in luminosity. Experimental evaluation in indoor and outdoor environments shows the performance of the foreground segmentation with the proposed SGGMM model using solely RGB colour or in combination with pixel uncertainties. These experimental scenarios take into account changes in the background within the scene. They are also used to compare the proposed technique with other state-of-the-art segmentation approaches in terms of accuracy and execution time performance. Further, our solution is implemented and tested in embedded camera sensor network nodes.     

磁悬浮实验分析

本文通过磁悬浮实验装置,分析了磁悬浮力的两种理论算法,比较了这两种算法的误差并与实验结果做了对比,用软件仿真计算了单匝线圈等效模型的磁悬浮力的频变特性并与理论值对比。本文在此基础上提出了多匝线圈的等效建模方法。验证表明这种方法与实验结果更接近,能比较精确地计算出盘状线圈的受力情况。     

液体介质三维光子晶体禁带可调性能研究

研究了宽频折射率可调液体介质在三维光子晶体上的应用。设计了完美结构的液体光子晶体,采用 平面波展开法和有限时域差分法研究了液体介质的介电常数对光子晶体带隙的影响规律;采用光固化快速成型技 术制造了完美结构光子晶体模型,通过灌注不同介电常数的液体介质,发现液体光子晶体的电磁带隙频率随液体媒 介介电常数的升高而向低频移动,其禁带相比于传统液晶可调光子晶体有所拓宽。     

QPSO与K-Medoids相结合的带障碍空间聚类新算法

分析了现有的带障碍约束空间聚类算法,针对基于PSO优化的带障碍约束的K-Me足,提出了QPSO与K-Medoids算法结合的带障碍空间聚类新算法(QKSCO).在带障碍约束的空间条件下,该算法依据蚁群格网障碍距离作为聚类依据,引入了QPSO的快速全局收敛的特性,使之与K-Medoids算法的局部收敛特性相得益彰.实验结...     

聪脑益智针法联合精神运动康复 改善脑瘫认知障碍临床研究

摘 要:目的 观察聪脑益智针法联合精神运动康复改善脑瘫患儿认知功能障碍的临床疗效。方法 选取我院住院脑瘫患儿伴有认知功能障碍者100例为研究对象，以随机数字表法分为综合康复组、聪脑益智针法联合精神运动康复训练组各50例。两组患儿均以综合康复治疗为基础，治疗组在综合康复治疗基础上进行聪脑益智针刺联合精神运动康复训练治疗，两组患儿均治疗3个月，治疗前后均按参照有关文献拟定的疗效标准进行评定观察。结果 应用聪脑益智针法联合精神运动康复训练治疗脑瘫患儿认知功能障碍在提高智力方面亦优于常规综合治疗组，差异有统计学意义（P＜0.05）。结论 聪脑益智针法联合精神运动康复可有效改善脑瘫患儿认知障碍，临床疗效明显，值得在临床上推广应用。     

Performance improvement of 60‐GHz wireless optical systems with reverse‐parallel hybrid modulation scheme

This paper improves the performance of 60‐GHz wireless optical system including radio over fibre (RoF) and radio over free space optics (RoFSO), based on novel reverse‐parallel (RP) hybrid modulation scheme. This scheme combines the chromatic dispersion compensation technique of parallel modulation with energy efficiency manipulation technique of reverse modulation. Superior functioning of RoFSO is provided with reverse modulation compared with normal modulation. Comparative investigations are performed by loading 60‐GHz RF signal with 2.5 and 10‐Gbps data and modulating it with both reverse and hybrid modulators. Hybrid modulation performed better with improved BER of 10^?23 at distance of 51 km for 2.5‐Gbps data compared with reverse modulation with BER of 10^?7.     

Optical and electrical characteristics of GaN vertical light emitting diode with current block layer

A GaN vertical light emitting diode(LED)with a current block layer(CBL)was investigated.Vertical LEDs without a CBL,with a non-ohmic contact CBL and with a silicon dioxide CBL were fabricated.Optical and electrical tests were carried out.The results show that the light output power of vertical LEDs with a non-ohmic contact CBL and with a silicon dioxide CBL are 40.6%and 60.7%higher than that of vertical LEDs without a CBL at 350 mA,respectively.The efficiencies of vertical LEDs without a CBL,with a non-ohmic contact CBL and with a silicon dioxide CBL drop to 72%,78%and 85.5%of their maximum efficiency at 350 mA,respectively. Moreover,vertical LEDs with a non-ohmic contact CBL have relatively superior anti-electrostatic ability.     

阿霉素或吡柔比星联合化疗方案对老年患者心电图影响对比研究

目的：比较安全剂量（〈400mg／m^2）内阿霉素与吡柔比星对于心脏毒性大小。方法：90名以阿霉素为主联合化疗和59名以吡柔比星为主联合化疗的老年肿瘤患者每次采用阿霉素或吡柔比星40mg／m^2静点,每疗程3次,每疗程之间间隔3周,分别于用药后1天,1周,2周复查心电图。结果：应用吡柔比星化疗方案进行化疗,其引起心电图改变的可能性远远低于应用阿霉素联合化疗方案的老年患者。结论;吡柔比星心脏毒性低于阿霉素。     

CaO-SiO2-B2O3基板材料制备的研究

研究高温熔融法制备的CaO-B2O3-SiO2与溶胶凝胶法(sol-gel)法制备的CaO-B2O3-SiO2按不同比例制备的复相陶瓷,在850℃烧结温度下的晶相组成、微观结构、烧结性能、介电性能与导电浆料的匹配性.结果表明高温熔融法制备的CaO-B2O3-SiO2晶相含有大量的CaSiO3与少量的CaB2O4.添加sol-gel法制备的CaO-B2O3-SiO2后晶相无明显变化,但经SEM分析CaSiO3晶相长大,改善了体系的烧结性能与介电性能.当添加量为15.5%,在1 MHz下,可获得εr=5.80,tgδ=0.46× 10-4.