一类多站循环服务系统的状态与状态转移

探讨具有如下特征的多站循环服务系统：（１）队列容量有限;（２）每次服务对象受限;（３）实施非门限方式。论述的主要内容有：系统与队列运行特点;队列在服务期间的状态转移;队列在周期中的状态与状态转移;系统与队列的有关参量近似求解。     

基于类型化的城市地铁站点用地开发研究——以杭州地铁1号线为例

地铁已逐渐成为我国大城市重要的公共交通方式,其线路建设对城市用地开发具有深远影响。以杭州地铁1号线为例,利用聚类分析法,对2007―2018年3个时间段的102个站点周边土地开发状况进行了类型化分析,并探讨了各类型的用地特征、空间分布、变动模式、变动影响因素等。3个时间段的102个站点可分为7大类23小类,其用地构成表现出较大的多样性和较强的区位选择性,其变动模式多由郊外型向居住型、居住+服务设施型等转变,非建设用地和新居住用地的开发、服务功能的提升、老小区和工业用地的撤退等是类型变动的主要影响因素,共同引导站点周边用地内部的功能转变,并影响城市空间结构。     

环境监测优化布点的一种新方法

本文提出一个新的统计方法——主成分子集合选择法．这一方法用于环境监测优化布点研究，通过逐次提取测点所反映的环境质量信息的主成分，定量系统地进行寻优分析、筛选测点．本方法在厦门市取得成功应用，证明简单可行．本文给出了应用实例．     

一种提高差分GPS基准站定位精度的新方法

在差分GPS系统的应用中，基准站的精确定位是一个重要问题，本文首先介绍了C/A码差分GPS基准站的精确定位的一般方法，着重对在实践中最常用的简单平均方法做了详细分析，针对简单平均方法的不足之外，提出了一种基于精确衰减因子（DOP）加权的卡尔曼滤波方法，实验结果表明，本文提出的C/A码差分GPS基准站定位方法能够有效地提高定位精度。     

Multiple feedback at a single-server station

A single server facility is equipped to perform a collection of operations. The service rendered to a customer is a branching process of operations. While the performance of an operation may not be interrupted before its completion, once completed, the required follow-up work may be delayed, at a cost per unit time of waiting that depends on the type and load of work being delayed. Under some probabilistic assumptions on the nature of the required service and on the stream of customers, the problem is to find service schedules that minimize expected costs. The authors generalize results of Bruno [2], Chazan, Konheim and B. Weiss [4], Harrison [8], Klimov [10], Konheim [11], and Meilijson and G. Weiss [13], using a dynamic programming approach.     

Observational Study of Annual Variations of the Surface Energy Balance Components at Zhongshan Station of Antarctica in 1990

From February 1990 to January 1991, the measurement experiment was carried out at Zhongshan station, East Antarctica. In the experiment, measurements of the surface radiative fluxes and wind, temperature and humidity profiles in the lowest 32 m in the atmosphere boundary layer were made throughout the year. The regime of the surface energy balance was analysed based on the observed data. The conclusion was derived that in warm season (from Nov. to Feb.), large amounts of energy are absorbed by the surface and then transported to the atmosphere in the form of sensible and latent heat, while in cold season (from Mar. to Oct.) continually radiative cooling of the surface occurs.     

离子色谱法测定电厂炉管垢样中的Cl-、SO42-

介绍离子色谱法测定电厂炉管垢样中腐蚀介质Cl^-和SO4^2-的方法，并对使用在线淋洗液发生器与以前配制淋洗液的方法进行了对比，提出了其在应用中的特性。垢样中Cl^-和SO4^2-的相对标准偏差分别为2.7%和2.3%，回收率分别为89.0%-97.8%和91.0%-98.9%。     

基于改进C-C方法相空间重构和LS-SVM的隧道拱顶沉降预测模型

在地铁工程的设计、施工、工后沉降控制过程中,拱顶下沉监测值是反映地下工程结构安全和稳定的重要数据.针对常用的地铁拱顶沉降测模型只能做短期预测,精度不高,且需要一些土的本构参数的问题,将相空间重构、最小二乘支持向量机理论相耦合,建立基于改进C-C方法相空间重构和最小二乘支持向量机的地铁隧洞拱顶沉降混沌时间序列预测模型.经实例演算,模型比传统C-C方法相空间重构、基于最大Lyapunov指数的混沌预测模型、人工神经网络模型拟合效果好,预测精度高.     

Three Dimensional Monitoring of Stack Plume Dynamics by a Scanning Mie Lidar System as a Plume Watchdog Station

A scanning lidar system was developed to watch the nighttime diffusion process of plume from a smokestack of a large incinerator located around 3 km from the system. Observed data sets were visualized as three dimensional images in which could be seen the diffusion pattern from any direction, and this made it easy to investigate the exhaust dynamics. Observation results showed that the original plume extended at least 1.6 km, where there was a residential area, from the smokestack increasing in diameter to about 500 m. High density aerosols originating from the smokestack were measured in that area even at midnight. The lidar system performance as a plume watchdog station was discussed from the standpoint of publichealth-related plume monitoring.     

自动气象站实时监控系统的研究与设计

针对当前气象探测设备运行监控的重要性,文章对自动气象站监控技术进行了研究;首先结合XML站点信息文件从中心站服务器中获取自动气象站当前整点小时数据与缺测站点信息;然后对数据进行分析、过滤与编码,得到异常信息量;最后将此信息量发送到监控系统中;监控系统以当前成熟的51单片机为核心进行设计,实现与上位机实时通信,同时对当前异常信息量进行显示并产生报警信号,为技术保障员快速发现故障提供可行的依据;系统的实现不仅提高了自动气象站故障的快速响应,同时也为其它气象探测设备的监控提供了参考。