计算机专业电路课程教学改革与实践

本文针对计算机专业电路课程教学工作中存在的问题,从课程体系、课程内容的调整与选择,教学方法、课程考核方法的改革等方面提出了若干改进措施和建议。     

Photoreceptor Cells Constitutively Express IL-35 and Promote Ocular Immune Privilege

Interleukin-27 is constitutively secreted by microglia in the retina or brain, and upregulation of IL-27 during neuroinflammation suppresses encephalomyelitis and autoimmune uveitis. However, while IL-35 is structurally and functionally similar to IL-27, the intrinsic roles of IL-35 in CNS tissues are unknown. Thus, we generated IL-35/YFP-knock-in reporter mice (p35-KI) and demonstrated that photoreceptor neurons constitutively secrete IL-35, which might protect the retina from persistent low-grade inflammation that can impair photoreceptor functions. Furthermore, the p35-KI mouse, which is hemizygous at the il12a locus, develops more severe uveitis because of reduced IL-35 expression. Interestingly, onset and exacerbation of uveitis in p35-KI mice caused by extravasation of proinflammatory Th1/Th17 lymphocytes into the retina were preceded by a dramatic decrease of IL-35, attributable to massive death of photoreceptor cells. Thus, while inflammation-induced death of photoreceptors and loss of protective effects of IL-35 exacerbated uveitis, our data also suggest that constitutive production of IL-35 in the retina might have housekeeping functions that promote sterilization immunity in the neuroretina and maintain ocular immune privilege.     

芦山地震中大跨空间结构主要破坏模式及数值分析

为探究短边距混凝土网架平板支座的受力机理和破坏模式,分别针对不同混凝土边距以及不同钢底板开孔形式共3个平板支座缩尺试件进行拟静力试验。对平板支座试件的破坏模式、滞回曲线、混凝土柱上层箍筋应变进行分析。试验结果表明：采用规范中对抗剪锚筋混凝土边距的建议长度,不能避免支座混凝土边缘破坏发生,但是混凝土柱上层箍筋对混凝土边缘的约束作用明显,并且采用开长孔钢底板并合理设计开孔长度,能有效推迟甚至避免发生混凝土边缘破坏。     

Evaluation of artificial neural network modelling to predict torso muscle activity

Owing to the complexities involved in obtaining direct measures of in vivo muscle forces, validation of predictive models of muscle activity has been difficult. An artificial neural network (ANN) model had been previously developed for the estimation of lumbar muscle activity during moderate levels of static exertion. The predictive ability of this model is evaluated in this study using several techniques, including comparison of response surfaces and composite statistical tests of values derived from model output, with multiple EMG experimental datasets. ANN-predicted activation levels were accurately modelled to within 3% across a range of experiments and levels of combined flexion/extension and lateroflexion loadings. The results indicate both a high degree of consistency in the averaged muscle activity measured in several different experiments, and substantiate the ability of the ANN model to predict generalized recruitment patterns. It also is suggested that the use of multiple comparison methods provides a better indication of model behaviour and prediction accuracy than a single evaluation criterion.     

使用热泵技术从电厂冷却水取热供热实验研究

电厂冷却水蕴含着大量的可利用热能,是有待开发利用的低品位能源。为研究电厂冷却水热能的开发利用技术,模拟并搭建了以电厂冷却水为热源的供热实验系统,采用间接换热的方法回收电厂冷却水热能。研究结果表明：电厂冷却水回收利用实验系统满足建筑物冬季供热负荷要求,且该系统各项技术指标运行稳定,具有良好的节能效果和经济、环境效益。     

采用UV/H2O2体系进行烟气脱硫脱硝的实验研究

为寻求一种高效的烟气多污染物脱除技术,采用UV/H2O2体系进行烟气脱硫脱硝实验研究。在自制的鼓泡反应器上考察模拟烟气成分、H2O2溶液浓度和催化剂等影响因素对脱硫脱硝效率的影响,得出了最佳实验条件。当pH值保持在3.3左右,氧气体积浓度大于6%,溶液温度在45℃以下,加入金属催化离子时,SO2及NOx的脱除效率可达到95%以上。对实验结果进行了讨论和分析,认为该技术有望用于现有传统湿式脱硫技术的改造,使其具有同时脱硫脱硝功能。     

低压电缆在谐波环境下的阻抗特性研究

电缆广泛用于低压配电网中,研究低压配电系统中电力电缆的谐波特性十分重要。基于电路理论对电缆在谐波环境下的电阻和电抗计算方法进行分析,提出了在谐波频率下求解电缆全矩阵阻抗的实验测算方法,并探究不同参数对电缆电阻和电抗的影响。对电缆谐波阻抗进行实验测算并与公式计算结果进行对比,结果表明:电缆电阻会随谐波次数的增加而增大,而电缆电感则随谐波次数的增加而减小,电缆谐波阻抗近似计算公式对于单芯电缆和多芯电缆分别具有不同的准确精度,论文研究成果对电缆特性研究具有指导意义。     

阵列透镜测量仪的设计与应用分析

为了解决500mm以上大口径光束波前的实时测量问题,设计了一种波前测量系统,即透镜阵列测量仪,其最大优点是避免了现有的H-S波前传感器所面临的大口径缩束器的加工难题。介绍了该测量系统的组成结构及其测量原理,分析了测量系统在设计中的参数选择,并根据具体的系统参数讨论了测量系统的检测性能。在此基础上,利用数值模拟对1200mm口径光束进行了波前测量的仿真实验研究,分析了测量过程中系统标定对透镜阵列测量仪的作用。仿真实验表明,透镜阵列测量仪能够实现大口径光束的波前探测。     

三相全控桥式整流电路实验装置的研制

介绍了开发三相全控桥式整流电路实验装置的背景;叙述了TC787芯片的内部结构、工作原理、特点及芯片的各个管脚的功能;详细介绍了该实验装置的触发电路的设计思路、设计结果和工作原理;介绍了该实验装置的主电路部分的结构和特点。该实验装置性能可靠,符合本科生实验要求。     

一种抗噪的红外图像对比度增强方法

提出一种基于离散平稳小波变换和非线性增益的红外图像对比度增强方法。对红外图像进行离散平稳小波变换后,利用所提出的去噪方法对分辨率较好的各高频子带直接去噪;并利用所提出的非线性增益法结合文中的去噪法对分辨率较差的各高频子带进行增强。实验结果表明,提出的方法在有效地增强红外图像对比度的同时,又能很好地抑制相关噪声。算法在视觉质量上优于传统的反锐化掩膜法、直方图均衡法。