一种高效、容错的性能管理工具

性能管理是网络管理中的重要组成部分，本文从性能监视、性能统计和故障统计三个方面分别介绍了实现一个性能管理工具的一般步骤，特别是对于如何减小计算误差提出了自己的方法，最后介绍了实现一个完整的性能管理工具需要进一步做的工作。     

基于VC++的PC机与Avantes光谱仪串口通信的实现与应用

针对荷兰Avantes公司因未开放光谱仪的串行通信口,不能适合工业上较长距离与PC机进行通信的弊端,提出了PC机与Avantes光谱仪串口通信的方案,包括通信部分硬件结构,通信协议的制定及Windows下VC++串口程序的实现,在此基础上,开发了光谱仪数据采集与波形实时显示系统.应用结果表明,该系统能稳定地运行,具有很强的实用性.     

OSPF路由协议在气象信息网络中的应用

针对市、县气象局光纤网络主线路出现故障时备用线路无法自动启用的问题，采取在市局3台路由器问配置OSPF协议的方法，使它们根据各自的链路状态互通路由信息，确保路由的可达性，从而实现主线路和备用线路的自动切换以及主线路优先使用的功能。     

基于NTP的网络对时系统设计与实现

在气象信息网络系统内,由于网络传输的延迟以及Internet传输的不安全性,导致时间的准确性难以保证,严重影响了气象报文传输的及时性和有效性。为了解决这一问题,基于NTP协议,采用client/server方式实现了系统内计算机和外部精确时钟源的主动对时,保证了系统内时间的准确性和一致性。     

一种指挥部技术系统可移动监控方法

为适应新时期科技人员和管理人员对陆海联测指挥部技术系统的自动化、智能化监控要求,以提升指挥部技术系统监控和管理水平为目标,在历年陆海联测的基础上,设计并实现基于ONVIF协议的可移动监控系统。利用视频编码器将指挥部技术系统的输出信号转换为ONVIF协议的标准视频流,通过局域网接入硬盘录像机,最终在移动终端上安装硬盘录像机客户端,进而实现对指挥部技术系统的可移动监控。在实际灾害应急救援过程中,可为应急指挥与辅助决策人员,特别是前方决策人员提供各类技术系统信息,便于采取高效准确的救援措施,提高灾害处置能力,最大限度地减轻灾害造成的人员伤亡和经济损失。     

Reference Values Following ISO Guidelines for Frequently Requested Rock Reference Materials

We present new reference values for nineteen USGS, GSJ and GIT‐IWG rock reference materials that belong to the most accessed samples of the GeoReM database. The determination of the reference values and their uncertainties at the 95% confidence level follows as closely as possible ISO guidelines and the Certification Protocol of the International Association of Geoanalysts. We used analytical data obtained by the state‐of‐the‐art techniques published mainly in the last 20 years and available in GeoReM. The data are grouped into four categories of different levels of metrological confidence, starting with isotope dilution mass spectrometry as a primary method. Data quality was checked by careful investigation of analytical procedures and by the application of the Horwitz function. As a result, we assign a new and more reliable set of reference values and respective uncertainties for major, minor and a large group of trace elements of the nineteen investigated rock reference materials.     

建筑物不均匀震陷简化分析方法

基于对建筑物不均匀震陷机理的新认识，借助分层总和原理，基于不规则荷载下土的残余应变模型及土体逐步软化模型，提出了一套建筑物不均匀震陷的简化分析方法。此方法较以往更合理地考虑了土、结构和地震动的共同效应，可实现对不均匀震陷的时程分析，且原理简单，方便工程应用。方法的可靠性通过大型振动台实验进行了检验。     

不同版本规范设计的底框砌体结构地震易损性对比

历次地震震害表明,底框砌体结构在遭遇大地震时破坏严重。本文比较了《GBJ11-89建筑抗震设计规范》和《GB50011-2001建筑抗震设计规范》中关于该类结构的抗震设计要求。参考某地一个实际底框砌体结构建筑设计资料,分别按上述两版本规范设计了2个具有代表性的底框砌体结构。采用层间剪切模型基于IDA方法对结构进行了地震易损性分析,对比分析结果表明:按两版本规范设计的底框砌体结构的破坏均出现在过渡层;在设防地震作用下,按《89规范》设计的结构达到中等破坏的概率最大,使用功能受到影响,按《01规范》设计的结构达到轻微破坏状态的概率最大,使用功能基本无影响;在罕遇地震作用下,按《01规范》设计的结构发生严重破坏和毁坏的概率比按《89规范》设计的结构明显降低,抗震能力明显提高。本文提供的结果可丰富底框砌体结构地震易损性数据,为区域地震风险评估、震害预测等研究提供更加精细的易损性模型。     

Simplified method for evaluating the response of existing tunnel induced by adjacent excavation

Adjacent excavation may have a negative influence on the existing tunnel underneath. Thus, it is important to evaluate the response of the tunnel due to adjacent excavation. However, there is little report about using the Kerr foundation model to simulate the tunnel-soil interaction. Meanwhile, the Timoshenko beam, which can take the tunnel shearing effect into consideration, is more suitable to estimate the behavior of the tunnel. To simulate the interaction between soil and tunnel, the existing tunnel is simplified as a Timoshenko beam lying on the Kerr foundation model, and a simplified theoretical method is proposed to calculate the response of the existing tunnel induced by adjacent excavation. The proposed method is validated by two field case studies. Results indicate that the predictions given by the proposed method show great agreement with field measurements and it is more accurate to evaluate the tunnel-soil interaction compared with the previous method. The further parametric study shows that the relative position between excavation and tunnel, the ground Young's modulus, the depth of existing tunnel centerline, and length and width of excavation are both significant factors governing the tunnel response induced by adjacent excavation, while the influence of tunnel shear stiffness and skew between tunnel and excavation are slight. The proposed method can be applied to predict the potential risk of existing tunnels induced by adjacent excavation in relevant engineering projects.     

植被冠层日光诱导叶绿素荧光塔基自动观测方法及系统介绍

植物光合作用所提供的物质和能量是人类赖以生存的关键因素,而日光诱导叶绿素荧光SIF(Sun-Induced chlorophyll Fluorescence)是植物光合作用的副产品,与光合作用关系密切,深入研究SIF将对于更加深入理解光合作用机制有着重要的意义.目前,近地面植被冠层SIF遥感观测发展迅速,但不同SIF观...