Research on the logic monitoring method for the cloud computing based safety computer

With the development of railway construction in China,the computing demand of the train control system is increasing day by day.The application of cloud computing technology on the rail transit signal system has become a research hotspot in recent years.How to improve the safety and availability of the safety computer platform in the cloud computing environment is the key problem when applying cloud computing to the train operation control system.Since the cloud platform is in an open network environment,fac-ing many security vulnerabilities and malicious network attacks,it is necessary to monitor the operation of computer programmes through edge safety nodes.Firstly,this paper encrypts the logical monitoring method,and then proposes a secure computer de fence model based on the dynamic heterogeneous redundancy structure.Then the continuous time Markov chain(CTMC)is used to quantitatively solve the stable probability of the system,and the influence of different logical monitoring methods on the anti-attack performance of the system is analysed.Finally,the experiment proves that the dynamic heterogeneous redundancy structure composed of encryption logic monitoring can guarantee the safe and stable operation of the safety computer more effectively.

The State-of-the-Art Review on Applications of Intrusive Sensing,Image Processing Techniques,and Machine Learning Methods in Pavement Monitoring and Analysis

In modern transportation,pavement is one of the most important civil infrastructures for the movement of vehicles and pedestrians.Pavement service quality and service life are of great importance for civil engineers as they directly affect the regular service for the users.Therefore,monitoring the health status of pavement before irreversible damage occurs is essential for timely maintenance,which in turn ensures public transportation safety.Many pavement damages can be detected and analyzed by monitoring the structure dynamic responses and evaluating road surface conditions.Advanced technologies can be employed for the collection and analysis of such data,including various intrusive sensing techniques,image processing techniques,and machine learning methods.This review summarizes the state-ofthe-art of these three technologies in pavement engineering in recent years and suggests possible developments for future pavement monitoring and analysis based on these approaches.

Preliminary Application of Combinatorial Measurement and Regression Analysis Method to High Precision Instrumental Analysis

With determination micro-Fe by 1, 10-phenanthroline spectrophotometry for example, they are systematically introduced the combinatorial measurement and regression analysis method application about metheodic principle, operation step and data processing in the instrumental analysis, including: calibration curve best linear equation is set up, measurand best linear equation is set up, and calculation of best value of a concentration. The results showed that mean of thrice determination , s = 0 μg/mL, RSD = 0. Results of preliminary application are simply introduced in the basic instrumental analysis for atomic absorption spectrophotometry, ion-selective electrodes, coulometry and polarographic analysis and are contrasted to results of normal measurements.

Method of Phase Diagrams for the Analysis of Seism-Acoustical Spatial-Time Monitoring Data in Oil Wells

Experimental and theoretical studies of the mechanisms of vibration stimulation of oil recovery in watered fields lead to the conclusion that resonance oscillations develop in fractured-block formations. These oscillations, caused by weak but long-lasting and frequency-stable influences, create the conditions for ultrasonic wave’s generation in the layers, which are capable of destroying thickened oil membranes in reservoir cracks. For fractured-porous reservoirs in the process of exploitation by the method of water high-pressure oil displacement, the possibility of intensifying ultrasonic vibrations can have an important technological significance. Even a very weak ultrasound can destroy, over a long period of time, the viscous oil membranes formed in the cracks between the blocks, which can be the reason for lowering the permeability of the layers and increasing the oil recovery. To describe these effects, it is necessary to consider the wave process in a hierarchically blocky environment and theoretically simulate the mechanism of the appearance of self-oscillations under the action of relaxation shear stresses. For the analysis of seism acoustic response in time on fixed intervals along the borehole an algorithm of phase diagrams of the state of many-phase medium is suggested.

Analysis of Existing Problems and Treatment Methods of Urban Environmental Monitoring

With the rapid development of the city,the concept of ecological environment has been integrated into everyone’s heart.In the new era,people also have higher requirements for the quality of living environment.However,at this stage,with the development of urbanization and industrialization,the problem of environmental pollution has become more and more serious.Therefore,we must do a good job in urban environmental monitoring,pay attention to the protection of urban environment,design and implement effective governance methods,so as to improve the quality of environmental governance.This article analyzes the problems in urban environmental monitoring,and formulates reasonable treatment methods and suggestions.

Applied research of correspondence analysis method in waste tailings reservoir heavy metal pollution monitoring points optimization

In order to optimize monitoring points and monitoring factor, the relationshipbetween pollutants and soil sample were established by correspondence analysis.Thestudy results show that the reflecting monitoring points and monitoring factors in thegraphic on the same factor axis can clearly express the intrinsic link between pollutantsand monitoring points and distribution characteristics.To determine the main monitoringpoint and the main monitoring indicators can reduce and optimize the number of monitoringpoints under the premise of ensuring the typical and representative of monitoring data.Using the correlation of pollutants can reduce the number of monitoring indicators and improvethe effectiveness of data collection.

Eddy Current Analyses by Domain Decomposition Method Using Double-Double Precision

A matrix equation solved in an eddy current analysis,??-??method based on a domain decomposition method becomes a complex symmetric system.In general,iterative method is used as the solver.Convergence of iterative method in an interface problem is improved by increasing an accuracy of a solution of an iterative method of a subdomain problem.However,it is difficult to improve the convergence by using a small convergence criterion in the subdomain problem.Therefore,authors propose a method to introduce double-double precision into the interface problem and the subdomain problem.This proposed method improves the convergence of the interface problem.In this paper,first,we describe proposed method.Second,we confirm validity of the method by using Team Workshop Problem 7,standard model for eddy current analysis.Finally,we show effectiveness of the method from two numerical results.

A Comparison of Weighing Methods Prior to Fusion Preparing Iron Samples for XRF Analysis

Sample preparation by fusion for XRF analysis is all about knowing the exact weights of the sample and the flux (sample-to-flux ratio). The whole analytical chain, including the weighing step in sample preparation prior to fusion, is of crucial importance to get precise and accurate x-ray fluorescence (XRF) results. Consequently, the weighing method will affect the quality of the analytical results given by the spectrometer. In this study, the effects of different weighing methods on the precision (RSD) of the obtained XRF results are compared to determine the best weighing method for sample preparation by fusion in terms of comparable precisions in the XRF results.

Performance of the suspension method in large cross-section shallow-buried tunnels

Large cross-section tunnel construction induces ground surface settlements, potentially endangering both subterranean projects and nearby above-ground structures. A novel tunnel construction method, known as the suspension method,is introduced in this paper to mitigate surface settlement. The suspension method employs vertical tie rods to establish a structural connection between the initial tunnel support system and the surface steel beam, thereby exerting effective control settlements. To analyze the performance of the proposed method, systematic numerical simulations were conducted based on the practical engineering of Harbin Subway Line 3. The surface settlement and vault settlement characteristics during construction are investigated. The results show a gradual increment in both surface and vault settlement throughout the construction process, culminating in a stabilized state upon the completion of construction.In addition, compared to the double-side drift method and the Cross Diaphragm Method(CRD) method, the suspension method can obviously reduce the surface settlement and vault settlement. Moreover, the surface settlements and the axial force of tie rods were continuously monitored during the construction process at the trial tunnel block.These specific monitoring measurements are illustrated in comparison to numerical analysis results. The monitored results show great agreement with the numerical predictions, confirming the success of the project. This research can serve as a valuable practical reference for similar projects, offering insights and guidance for addressing ground surface settlements and enhancing construction safety in the domain of large cross-section tunneling.

基于均匀化理论与上限分析的膨胀土滑坡稳定性分析

在膨胀土和滑坡共同作用下,隧道洞口段施工更容易引发地表开裂甚至滑坡等工程灾害,在隧道内采用微型桩群防治滑坡比抗滑桩具有优势。本文基于均匀化理论与上限分析对某高速公路隧道洞口段膨胀土滑坡的稳定性进行计算,并评价微型桩群和削方卸载不同组合方式的处置效果,计算时将微型桩群及桩周土通过均匀化理论等效为符合摩尔库仑强度准则的等效加固体来,以此提高计算效率,最后通过对现场削方+微型桩群加固处置后的滑坡变形监测来验证计算的合理性,得出如下结论:相较于土的强度参数,等效加固体内摩擦角保持不变,黏聚力从26kPa提高到85.36kPa。处置前后的滑坡稳定性评价结果表明,不做处理时,滑坡滑动面从滑坡上方岩土交界面延续到隧道洞口前;仅采用微型桩群加固时,滑坡安全系数在1.17左右,滑动面从岩土交界面延续到隧道洞口后;同时采用微型桩群加固和削方卸载时,滑坡安全系数提高到1.26~1.28,滑动面上缘由土石交界面前移。现场变形监测表明地表变形与深层土体变形均不超过3mm,该措施能保障滑坡的稳定性,同时也验证了计算方法的合理性,可为同类工程提供参考。

淬火态30CrNi2MoVA高强度钢高速铣削参数优化研究

运用三因素三水平的正交试验方案对淬火态30CrNi2MoVA高强度钢进行高速精密铣削实验,获得了铣削参数对于铣削力的影响规律以及高速切削机理;根据各铣削力实验结果建立指数型回归模型,并对其进行显著性分析;对铣削合力线性模型进行方差分析得到铣削参数对于铣削合力变化的显著性分析结果,显著性大小依次为轴向切削深度、每齿进给量、切削速度;应用田口法与极差分析法相结合,以铣削合力进行单目标的参数优化,获得了大致相同的最优铣削参数组合;通过计算证明了田口预测方法预测值与实验值的一致性。

基于不确定性分析的供水管网压力监测点优化布置

针对现有供水管网压力监测点布置中产生的异参同效问题,基于正态分布利用蒙特卡罗随机抽样法分析管网节点需水量的不确定性,引入节点压力波动系数,讨论节点需水量的随机性对供水管网全局的影响,结合节点水压灵敏度,解决供水管网压力监测点布置中存在的异参同效问题。以华东某城区供水管网为例,结合水压相关性与水压灵敏性构建模型,采用蝙蝠算法求解,获得测压点布置方案。以稳态水力模型的节点需水量初始值为基准进行20 000次随机抽样,应用抽样值进行模拟,计算节点压力波动系数与节点灵敏度,确定最优方案,解决异参同效问题,为供水管网压力监测点布置方案的选取提供了新思路。

玉米精密播种机漏播监测器研制与试验

为有效监测玉米播种质量,减少漏播、断行的发生,设计了一套基于光电法原理的玉米漏播监测器。采用3mm红外发光管和硅PIN光电二极管作为感测元件,利用光伏效应原理设计了传感器,以检测种子是否通过。以STM32F103单片机为核心,设计了主控制器。主控制器通过中断方式接收传感器的信号,种子通过时即触动内部相应定时器工作或复位,定时计数超过3 s时产生报警信号并在屏幕上显示。田间试验表明,在播种机正常排种频率范围内,计数准确率>97%、漏播监测率达到95%,光照强度、机具振动对漏播监测器工作无影响。

钢管幕埋深及顶进顺序对地表变形的影响

依托合肥市滨湖科学城庐州大道浅埋隧道段工程,利用有限差分软件FLAC 3D对不同埋深及顶进顺序下钢管幕顶进施工过程进行模拟。结合模型计算结果和监测数据分析,总结钢管幕埋深与顶进顺序对地表变形的影响。结果表明,先上后下的顶进方案优于先下后上的方案,上部钢管的存在会减小下部钢管顶进对地表变形的影响;钢管的埋深越大,对于地表变形的影响也越大,下部钢管的顶进会扩大沉降范围和沉降值,上部钢管的顶进会使地表产生小幅隆起;从上至下依次顶进的方案为确定的最优方案,随着钢管顶进数量的不断增加,地表沉降量不断扩大,地表变形曲线从V形向W形转变,表明浅部钢管对地表变形有一定的控制作用。

环境监测中两种COD测定方法的对比研究

环境监测中的化学需氧量(COD)是评估废水中有机物污染程度的关键指标。本研究对比了两种常用的COD测定方法:传统重铬酸钾法和快速光谱法。通过对两种方法的原理、优缺点进行分析,结果表明,传统重铬酸钾法准确度高,但操作繁琐、耗时且对环境有害,而快速光谱法操作简便、快速,适合快速的现场监测,但容易受其他物质的干扰。本研究为环境监测领域选择COD测定方法提供了科学依据。

公路隧道施工水平位移及收敛量测精度确定方法与衡量方法探讨

隧道施工监控量测是隧道工程专业与测绘工程专业的交叉领域,在精度要求方面,隧道专业和测绘专业的规范标准中都有相关的条文说明,但不同规范标准之间存在侧重和差异,这给使用者在参考时造成一定的困扰。为了明确公路隧道施工监控量测水平位移监测精度要求,通过分析现行的国家标准、行业标准中的相关规定,结合多本现行规范中关于精度要求的说明,给出一种以确定允许变形量→确定衡量标准(中误差)→确定最大允许误差(中误差限差)为思路的精度确定方法,和计算实测数据中误差→对比计算中误差与中误差限差→判断数据可信度的精度衡量方法,并通过实测数据论证其合理性。结果表明,文中提出的精度确定方法、精度衡量方法及仪器选用能满足公路隧道水平位移监测或收敛监测的工作需求。

连续流动分析法测定水中挥发酚和总氰化物的实验探究

挥发酚和总氰化物是水质监测和水环境保护的关键指标,其准确测定对评估水体质量和环境影响至关重要。随着检测技术的发展,采用在线前处理的流动注射分析法和连续流动分析法已成为其主流的检测手段。而我国尚未制定水中氰化物(除生活饮用水外)的连续流动—分光光度法国家或行业标准,为水质样品中氰化物的准确监测带来不便。本研究通过控制变量法,系统研究了试剂pH及浓度等因素对检测结果的影响,筛选出了合适的检测条件。该方法的测试结果呈现完全线性相关,挥发酚和总氰化物检出限低至0.279μg/L和0.118μg/L,样品加标回收率达到95.0%~105%。本研究不仅为水质挥发酚和氰化物的国家和行业标准制定提供了经验和依据,还为水质监测领域引入了一种更环保的方法。

地表水污染状态实时监测与污染物特征分布研究

在广东省黄冈河流域,由于亚热带季风气候和大量降雨导致的土壤侵蚀,地表水污染成为一个严重问题。为降低损失,文章实施了实时监测并分析污染物特征分布。首先,对地理、气候、地表水利用及污染现状进行了深入分析;然后,利用地表水微波检测法进行实时监测;最后,基于监测结果,采用单因子指数评价法对地表水污染物特征分布进行了分析。结果表明,文章研究成功实现了实时监测,并展示良好的污染物特征分布分析能力,为地表水污染防治提供有力保障。

环境监测实验室质量控制方法探析

环境监测实验室主要是用于对环境中各种物理、化学和生物指标进行监测和分析。通过分析实验室数据,可以评估环境质量、监测环境变化、探测污染源和制定环境保护政策。环境监测实验室的质量控制是保证环境监测数据可靠性和准确性的重要因素。该文从数据的准确性和可靠性、法规和标准、数据的可信度、环境污染和趋势、公众健康和环境安全等方面探讨环境监测实验室质量控制的重要性,以及从校准和验证仪器设备、质量控制样品、质量控制图表、样品标识和追踪、实验操作规范、实验室环境控制、培训和认证等方面探讨环境监测实验室质量控制方法,以期为提高环境监测实验室工作质量提供参考。

既有地铁线上跨基坑管幕MJS地基加固施工实例分析

以徐州新建彭祖大道下方的隧道开挖区间为研究对象,针对徐州的地质条件研究了该地下工程近距离上跨既有运营地铁2号线对2号线的影响,并且采取了管幕加MJS工法联合加固地基的施工方案,对既有地铁2号线进行加固保护和控制地表的沉降。通过有限元分析可以看出,管幕法联合MJS工法可以有效控制既有2号线的变形隆起数值,在一级放坡施工阶段,铺设管幕数值为3.92 mm,未铺设管幕数值则为6.45 mm,并且在铺设管幕的情况下开挖基坑的变形也得到了较好的控制,证实了联合两种方案可以有效地保护既有2号线和基坑的施工安全。最后以10 d为一个周期进行监测,数据呈现出正常的变化规律,监测的结果与施工工况、土质状况基本吻合。