面向大型激光装置的分布式控制软件框架设计

基于对大型激光装置结构、设备组件及其监控功能的分析和抽象,提取出全装置通用的软件设备及功能组件,设计了面向大型激光装置的分布式控制软件框架。作为集中控制系统软件构建的基础,该软件框架已应用于神光Ⅲ主机的集中控制系统,在提高软件复用度、减少软件集成调试时间、提高系统设计开发集成效率和总体性能方面起到了较好的作用。     

基于模糊粗糙集和D-S证据理论的多源灌溉信息融合方法

针对多源灌溉信息决策过程中不确定性信息难以融合的问题,提出了一种基于模糊粗糙集和D-S证据理论相结合的决策融合方法。运用模糊粗糙集理论,建立基本概率分配函数,计算各灌溉因子与灌溉决策之间的依赖程度,构建多个融合灌溉因子对灌溉决策的识别框架;然后运用改进的D-S证据理论,进行多源灌溉信息决策层级的融合,最终解决不确定信息的表达和合成问题。应用上述方法对华北地区冬小麦土壤水分、光合速率和气孔导度等信息进行灌溉决策融合,结果显示：灌溉决策的不确定性由融合前的最高38%降至9.84%,该方法可有效地提高灌溉决策精度,降低灌溉决策的不确定性     

基于RFID的冷链物流监测系统的设计

低温物流运输车在食品之冷链中扮演着非常重要的角色,主要功能则是在冷冻冷藏车内所载运的食品运送的过程中,食品的温度必须保持在法规规定的范围内,严格有效地控制在特定温度下运作,才能确保产品的质量。为解决以上问题,提出一种基于RFID的低温食物冷链温度监测系统,通过放置在食品包装袋或冷藏箱内的带有温度传感器的RFID标签来实时地采集环境温度信息,并在到达仓库或者配送中心后,将数据通过RFID读取器传送至后台处理程序,利用程序对各个食品的温度数据进行监测和处理。该系统可以有效稳定地对冷链温度进行监测,以保证食品的质量。     

Leader-following consensus of high-order multi-agent linear systems with bounded transmission channels

The leader-following consensus of high-order multi-agent linear systems with bounded transmission channels is considered. Agents modelled as LTI dynamics exchange information according to a network which can be described as a graph with agents as its vertices and information transmission channels as its edges. The transmission channels are bounded. The objective is leader-following in the sense that the state of all agents should converge to that of the leader vehicle. Detailed analysis of the leader-following consensus under bounded transmission channels is investigated for both fixed and switching network topologies.     

Assessment of grassland degradation near Lake Qinghai,West China,using Landsat TM and in situ reflectance spectra data

The severity of grassland degradation near Lake Qinghai, West China was assessed from a Landsat Thematic Mapper (TM) image in conjunction with in situ samples of per cent grass cover and proportion (by weight) of unpalatable grasses (PUG) collected over 1?m² sampling plots. Spectral reflectance at each sampling plot was measured with a spectrometer and its location determined with a Global Positioning System (GPS) receiver. After radiometric calibration, the TM image was geometrically rectified. Ten vegetation indices were derived from TM bands 3 and 4, and from the spectral reflectance data at wavelengths corresponding most closely to those of TM3 and TM4. Regression analyses showed that NDVI and SAVI are the most reliable indicators of grass cover and PUG, respectively. Significant relationships between TM bands-derived indices and in situ sampled grass parameters were established only after the former had been calibrated with in situ reflectance spectra data. Through the established regression models the TM image was converted into maps of grass cover parameters. These maps were merged to form a degradation map at an accuracy of 91.7%. It was concluded that TM imagery, in conjunction with in situ grass samples and reflectance spectra data, enabled the efficient and accurate assessment of grassland degradation inside the study area.     

Temporal filtering of successive MODIS data in monitoring a locust outbreak

The emergence of high temporal resolution satellite data such as MODIS enables timely monitoring of locust outbreaks from space. This monitoring is hampered by the effect of random atmospheric variations on satellite imagery, which may be suppressed through temporal filtering. This paper aims to evaluate the utility of temporally filtering successive MODIS data in monitoring an outbreak in East China. Of the eight vegetation indices examined, the commonly used NDVI was the most indicative of varying vegetation conditions caused by locust infestation inside the study area. The averaging of three successive days of satellite data improves the R ² value of NDVI regression models by 0.227 over single‐day data. It also outperforms the data averaged from two successive days (a broader window size was not attempted due to the short span of the study period). Temporally, NDVI changed at varying rates daily during the outbreak. Early in the outbreak it increased at a reduced pace until 7.5 days. Afterwards it started to decrease at an accelerated rate. If temporally filtered with a proper window size, successive MODIS data allow the outbreak to be monitored accurately (R ² = 0.696).     

基于模糊物元模型的渭北工业区地下水资源承载力评价

建立了模糊物元模型,选取12个评价指标,参照其他文献并结合研究区实际情况进行等级划分,采用熵值法确定各评价指标权重,以7个被评价样本与标准样本之间的贴近度表征来评价样本的优劣,从而得到研究区地下水资源承载力评价结果。经计算,阎良、临潼、高陵、渭北工业区及Ⅰ级、Ⅱ级、Ⅲ级与标准样本之间的欧式贴近度分别为0.5359、0.7538、0.5926、0.6556、0.8635、0.6893、0.5508。阎良的地下水资源承载力处于Ⅲ级,地下水资源承载力弱,地下水处于高度利用状态,开采潜力较小;其余地区地下水资源承载力均处于Ⅱ级,地下水资源承载力一般,地下水处于中度利用状态,尚有一定开采潜力。通过比较验证,本研究的模糊物元模型评价结果合理可行,该方法简便实用。     

基于自适应加权与LZW的WSNs层次式数据融合算法

为了兼顾提高数据采集精度与效率的同时有效降低传感器节点能耗,提出了一种基于自适应加权与LZW的层次式数据融合算法.传感器簇头节点对传感器节点发送的数据进行自适应加权处理,估计出均方误差最小时的值,簇头节点将处理后的数据采用LZW算法以一定的信息量压缩后再进行数据的传输.仿真表明,该层次式融合算法提高了数据采集的精度并有...     

一种面向开发过程的软件可靠性预测方法

在进行软件开发时,该如何回答这样的问题,＂当前开发的软件可靠性是什么？＂这个对于用户来说是非常重要的信息,却难以表述。以此为方向,研究了一种面向开发过程的软件可靠性预测方法,结合软件开发各个阶段的特点,通过合理地采用软件可靠性早期预测模型,实现对开发中软件可靠性的预测。实践应用表明,该方法紧密结合软件开发的实际,反映了软件可靠性与开发人员的水平、开发规范的标准之间的联系,有助于采取必要的措施提高其以后的可靠性,从而也验证了该方法的工程实用性。     

Comparison of Dye Behavior from Aspen HYP: Dyes Added in the HYP Manufacturing Process Versus Dyes Added at the Papermaking Wet End

Abstract

The yellowish color of High Yield Pulp (HYP) gives some psychological obstacles and limits its application in some paper grades. Dyes are widely used in the papermaking process to shade the yellowish color of the paper products. We proposed to add dyes into the HYP manufacturing process to minimize the yellowish hue. In this work, we substituted the dye-added HYP (dyes added in the HYP manufacturing process) for hardwood kraft pulp in the production of fine paper grades, and compared the results from those by adding dyes into the papermaking wet end. A higher dye effectiveness was obtained when we used the dye-added HYP. Also, the dye-added HYP gave more effective performance of Precipitated Calcium Carbonate (PCC) fillers and Optical Brightening Agents (OBA) in terms of CIE whiteness and b*. In addition, the dye-added HYP showed less negative effect on brightness and better compatibility with other dyes. The underlying mechanism for the above experimental observation was proposed.