核安全级应用软件V&V过程体系建设及实践

依据我国核安全法规要求,在核安全级应用软件开发过程中,应通过进行一系列的验证与确认(VV)活动来证明其正确性和安全性。通过对法规标准的研究,结合工程应用经验,明晰VV管理、工作流程、技术文件和VV工具4个方面的VV要求和方法,提出一套适用于核电站安全级DCS应用软件的VV体系。该体系已经应用在某核电站项目中,保证了软件的质量和项目的成功实施。该体系在后续的华龙一号、AP1000等先进堆型项目中也具有较好的应用前景。     

基于随机模糊潮流的三相不平衡配电网节能降损方法

为有效降低三相不平衡导致的配电网能量损耗,提出一种基于随机模糊潮流的三相不平衡配电网节能降损方法。分析三相不平衡配电网的危害,获取配电网不平衡状态程度和线路有功损耗。充分考虑配电网三相不平衡状况下负荷的不确定性影响,采用随机模糊相容性方法对配电网线路的负荷执行模糊建模操作,将所获模糊输入变量引入潮流模型中,构建三相不平衡模糊潮流模型,获取三相模糊潮流计算结果的配电网有功功率损耗。并构建节能降损目标函数,采用动态改变因子粒子群算法求解获得最优解,实现配电网节能降损。算例仿真计算结果表明：该方法可以实现三相不平衡下的配电网节能降损,且目标函数求解时收敛性能较好,节能降损效率较高。     

超高层办公楼的结构设计与分析

某塔楼房屋高度199.5m,采用钢框架—混凝土核心筒结构体系.文中选取YJK和SATWE对结构分别进行小震弹性对比分析,同时对结构进行弹性时程分析和中震分析,选取sausage对结构进行了大震弹塑性分析,分析结果均满足既定抗震性能目标.     

光纤图像分割器的透过率分析与测试

以1×2(输入端为一列2000根光纤,输出端为两列1000根光纤)光纤图像分割器为例,分析了器件在传输图像过程中产生的四种损耗(吸收损耗、全反射损耗、散射损耗、端面菲涅耳损耗),并在理论上计算出以波长λ=632.8nm的He-Ne激光做光源时器件的整体透过率为54.56%,与实验所测值51.46%基本吻合,从而证明了自行设计测试装置的可行性.最后给出了提高光纤图像分割器透过率需遵循的基本原则.     

光通信中的新型光无源器件

基于全光网络的迅猛发展,本文简单介绍了波分复用器、光开关、光插／分复用器件方面的新型光无源器件,对器件原理、功能进行了阐述。文章对这些实现技术的特点进行了详细的分析和比较,最后给出了结论和展望。     

六陌辖尉俦感器件

太阳辐射测量将对预测长期的气候变化提供重要依据.为了获得更加精确的太阳辐出度数据,研制微型化、高精度的绝对辐射计是今后太阳辐射探测的重要研究方向.介绍了目前研究的几种典型的太阳辐射传感器件,重点阐述了几种常用的热电型辐射探测器,对它们的特点进行了分析和比较.     

Analysis and experimental study of low-stepped mirror in light FTIRS

The structural parameters of low-stepped mirror which is the core component of a light Fourier transform infrared spectrometer (FTIRS) have important influence on the performance of the instrument. A simple method of multiple deposition is proposed to fabricate a low-stepped mirror with step height of 625 nm, for its high precision, high efficiency and miniaturization. So the film stress will be introduced in the process of coating, which can lead to step deformation. We build a bending model of the low-stepped mirror and analyze the influence of its deformation. The light intensity and spectrum are changed by the step deformation. Therefore, the film stress should be reduced in order to ensure the accuracy of the spectral information. Increasing the thickness of substrate is proposed in this paper to reduce the step deformation, besides adjusting the coating temperature and adding sub-layer. Our results reveal that the basic requirements of the system are satisfied when the thickness of the substrate is 5 mm in the appropriate coating environment. An FTIRS based on stepped mirrors and grid beam splitter is assembled and corresponding experiment is carried out to obtain the spectrum curve of acetonitrile.     

Thermal analysis and an improved heat-dissipation structure design for an AlGaInP-LED micro-array device

This paper describes a novel finite element thermal analysis model for an AlGaInP-LED micro-array device. We also conduct a transient analysis for the internal temperature field distribution of a 5×5 array device when a 3×3 unit is driven by pulse current. In addition, for broader applications, a simplified thermal analysis model is introduced and its accuracy is verified. The internal temperature field distribution of 100×100 units is calculated using the simplified model. The temperature at the device center reaches 360.6 °C after 1.5 s. In order to solve the heat dissipation problem of the device, an optimized heat dissipation structure is designed, and the effects of the number and size of the heat dissipation fins on the thermal characteristics of the device are analyzed. This work has been supported by the Young Scientists Fund of the National Natural Science Foundation of China (No.61204055). E-mail:gaofl@jlu.edu.cn       

不同背景介质下金属Cu光子晶体带隙

提出了一种利用全反射抑制二维光子晶体表面电磁波泄漏的方法,并计算了不同背景介质下的二维金属Cu光子晶体的带隙结构,得到了带隙结构与填充率间的关系曲线。计算方法采用时域有限差分,金属型光子晶体由Cu柱构成。分别计算了以空气为背景介质和以PMMA为背景介质的正方晶格金属型光子晶体的带隙结构。研究结果表明：以PMMA为背景介质的正方晶格金属型光子晶体与以空气为背景介质相比,第一带隙更窄,第二带隙中心频率更低,且在填充率大于0.70时将会出现第三带隙。这对进一步扩展这种光子晶体的应用具有良好的参考意义。     

低损耗高带宽金属光子晶体弯波导的设计

设计了一种采用金属材料的二维光子晶体波导.针对金属的色散特性,运用时域有限差分方法对3种二维结构的90°转弯波导的TM波传播特性进行了研究.给出了在合适的填充率下,转弯效率随周期变化的曲线.最后对其中较优的一种结构作了进一步优化,使其3 dB时的带宽达到了99 nm,目标波长处的转弯效率达到了98.2％.该结构的主要参...