网络安全中的蜜罐技术和蜜网技术

当前，网络安全正在受到严重的威胁，传统的防御技术存在其固有的被动防御的缺陷，而蜜罐技术正以其主动防御的特性受到越来越多的关注。本文说明了其在网络安全中所起到的防御作用和通过收集信息而起到的研究作用，讨论了涉及到的诱骗机制、数据控制、数据捕获和数据分析等关键技术以及实际应用中的部署方案。     

秦皇岛市海水入侵特征

本文在海水入侵勘查、监测成果的基础上，阐述了该区海水入侵现状、分布特征、演化过程和入侵方式，探讨了海水入侵的机理，指出人类活动是海水入侵的诱发因素，超采地下水是海水入侵的根本原因。应用基于GIS的层次分析法进行了危险性评价，从地学角度，提出了海水入侵灾害生态综合防治对策。     

虚拟仪器在机械振动试验台检测中的应用

本文介绍了基于LabVIEW虚拟仪器的机械式振动试验台检测系统的构成,工作流程和LabVIEW在其中的应用,以此展示虚拟仪器技术使得现代检测系统变得更加简单、方便、有效。     

基于虚拟仪器的多路压力传感器自动检测系统设计

针对现有批量检测方法费时费力、检测结果不一致以及显示不直观等缺点,本文设计了基于虚拟仪器技术的多路压力传感器自动检测系统。利用高精度的数字万用表对压力传感器进行测量,通过自制的多路控制器切换多路通道,并为传感器提供恒流源。采用基于虚拟仪器的LabVIEW软件对仪器进行控制和采集,实现压力传感器的多路检测和校准。本系统具有检测速度快、精度高、人机界面良好等优点。     

基于虚拟仿真的测试性预计技术研究及应用示例

本文首先介绍了测试性技术现状等,之后详细阐述了基于虚拟仿真的测试性预计技术原理,在此基础上介绍了该方法的实现方式,并给出应用实例。可以看出,此方法可以快速给出系统的故障检测和故障隔离能力,大大减少故障检测和隔离时间,从而缩短维修时间,提高系统的任务可靠性,减少寿命周期费用（LCC）。     

基于CAN通讯的新能源汽车驱动电机检测技术研究

基于CAN通讯的新能源汽车驱动电机检测技术，已成为当下工业研究的关键方向。本文探讨了CAN通讯在驱动电机中的特点，如高实时性、可靠性和扩展性等，深入分析了新能源汽车驱动电机的主要性能指标，包括效率、扭矩和响应时间等。通过现行的驱动电机国家标准，本文详细研究了基于CAN通讯驱动电机典型项目的检测技术和方法，介绍了CAN通讯的物理连接和通讯配置。最后，本文提出了新能源汽车驱动电机领域的未来发展趋势，强调了技术创新、行业应用前景及其面临的挑战和解决方案。本文为新能源汽车驱动电机的检测技术提供了一些见解和方向，有助于推动相关领域的技术进展和产业发展。     

基于物联网的智能家居系统安全可靠性研究

智能家居是智慧城市的重要构成单元,是各类应用的系统化工程,本文针对基于物联网的智能家居系统,首先以物联网技术描绘了智能家庭业务全景,阐述了实现全屋智能的发展阶段和智能家居系统构成;重点提出智能家居产业在检测领域面临的问题与难点,建立性能评测体系框架,指出系统可靠性分析与系统化测试的主要分类和目标,并对基于物联网的智能家居系统安全性进行分层研究,分析给出系统底层和上层网络部分的安全威胁问题及对应各层的安全要求。     

美国西北部太平洋沿海地区植物入侵及其控制对策

美国西北部太平洋沿海地区作为美国的对外交通要塞以及自身的自然环境，因其湿润的温带海洋性气候结合人为的和自然条件的因素，造成了比较严重的植物入侵状况。本文作者结合在美国华盛顿地区做入侵植物生态环境调查和入侵植物生态环境修复工作，总结和归纳了在美国西北部太平洋地区的几种较严重的入侵植物状况及其控制对策，以便对我国生物入侵控制方法有所借鉴。     

基于密码技术的计算机安全防护体系

密码技术是实现网络安全的关键技术之一,本文首先介绍密码技术的基本概念,然后着重讨论建立密码防护体系的基本思想和密码防护体系,加密算法,并详细探讨了密钥的管理方法和密码技术的应用。     

基于分段式电压采集法的天线绝缘检测技术研究

如今,短波发信伸缩天线、插拔鞭天线等大量应用于通信台站与舰船上,天线绝缘性能是其重要的考核指标,该参量关乎到天线的持久性与通信的稳定性。以天线绝缘电阻检测技术为研究对象,分析了天线绝缘检测手段的必要性与存在的不足,在普通绝缘检测技术的基础上,提出了一种基于分段电压采集法的绝缘检测方法,对信台站与舰艇上天线的设计、施工、调试、维修、以及现场系统联调等环节起到保障作用,改善了天线绝缘性能检测技术智能化、模块化、高精度等问题。     

秦皇岛市海水入侵现状及防治对策研究

海水入侵是一种严重的地质灾害,它可引起机井报废、土壤盐渍化、地下管线腐蚀等一系列生态环境问题。秦皇岛市自20世纪80年代开始,在沿海的石河、汤河、洋河、戴河等入海口以及昌黎县、抚宁县灌区,先后发生了海水入侵现象,且有范围越来越广、程度越来越重的趋势,给当地工农业生产带来了巨大影响。通过分析秦皇岛市海水入侵的原因,提出修建沿海防护工程是治理海水入侵的有效措施,合理开采地下水、节约用水、进行污水和雨水资源化、海水淡化等减少淡水开采或补充地下淡水层是解决海水入侵的根本措施。     

The utilization of brackish water, protecting the quality of the upper fresh water layer in coastal aquifers

Increasing salinity is one of the most significant and widespread forms of groundwater pollution in coastal areas. This paper presents the causes and impacts of saline water intrusion in coastal areas. Various causes of salt water intrusion, and approaches for the determination of its extent and various measures to control the salt water intrusion are described. An aquifer performance test (APT) approach is presented to identify the extent of existing salt water intrusion in the study area located in the southwest coastal region of Gujarat State (India). A resistivity based experimental technique is used to identify the quality of the groundwater available at different depths. A methodology is presented to assess the extent of available fresh and saline groundwater and to find out the limit up to which lower saline groundwater can be withdrawn for industrial purposes without affecting the upper fresh water layer which can be made available for domestic purposes.     

电导率法在海水入侵监测中的应用

海水入侵是人类不合理开采地下淡水而导致的一种环境恶化的地质灾害,其发生过程是一个可监测和可预报的过程。目前海水入侵的监测方法主要为物探和水化学方法,本文讨论了电导率法在海水入侵实际监测中的原理及应用。     

AQUIFER SALINIZATION IN THE YUN‐LIN COASTAL AREA,TAIWAN1

ABSTRACT: This study analyzes possible causes of shallow ground water salinization in the coastal area of Yun‐Lin. The local hydro‐geologic setting is determined from geological drilling data and sea floor topography. Three possible causes (sea water intrusion, salt water percolation through wells, and infiltration of salty water from fish ponds) are evaluated. Chloride concentration is used as an index to measure ground water salinization. Sea water intrusion is modeled by the advective/dispersive equation, and salt water infiltration from wells and fish ponds is calculated by estimating the amount of water percolated. The determined local hydrogeologic setting suggests that the shallow aquifer may be connected to the sea water, resulting in salt water intrusion as a large amount of shallow ground water is withdrawn. The percent contributions of sea water intrusion, percolation through wells, and infiltration of water from fish ponds, to the salinization of the shallow aquifer at Ko‐Hu in the Yun‐Lin coastal area are approximately 27 percent, less than 1 percent and 73 percent, respectively. The results suggest that the vertical infiltration of salt water from fish ponds is the major cause of shallow ground water salinization in the coastal area of Yun‐Lin.     

MODEL STUDIES OF SALT WATER INTRUSION1

Model studies were and are still being used to verify certain theories in ground-water flow systems in general. In complex cases, the model studies may be extremely useful especially when a theoretical rigorous analysis does not exist. The models cannot be considered entirely satisfactory due to the several drawbacks in each type in addition to the normal human errors in experimentation. This paper is concerned only with the viscous flow models. However, a brief summary of the other types of models, which may possibly be used in connection with salt water intrusion problems is given. It should be noted that some of such experiments are not directly related to the field of salt water intrusion. Two main types lie within this category: The gravity flow systems which are analogous to some phases of salt intrusion problems and problems in oil fields which bear general similarities to sea water intrusion zones. In oil fields, gas cycling studies give valuable information to sea water problems. Model studies are used by hydraulic engineers, geologists, petroleum engineers, physicists, foundation engineers and several other professional groups.     

基于ANN的环境质量评价

人工神经网络通过神经元之间的相互作用来完成整个网络的信息处理，具有自学习和自适应等一系列优点，因而用它来评价环境质量是可行的。本文针对环境质量评价问题，建立了基于神经网络的评价系统，给出了应用实例。     

INFLUENCE OF BATHYMETRIC CHANGES ON HYDRODYNAMICS AND SALT INTRUSION IN ESTUARINE SYSTEM1

ABSTRACT: A vertical (laterally integrated) two‐dimensional numerical model has been applied to study the hydrodynamic characteristics and salt water intrusion in the Tanshui River estuarine system. The cross‐sectional profiles measured in 1978 and 1994 are schematized for model simulations. Detailed model calibration and verification have been conducted with water surface elevations, tidal current, salinity distributions, and residual velocities measured. The overall performance of the model is in qualitative agreement with the available field data. The model was then used to study how hydrodynamics and salt water intrusion change in response to changes in bathymetry. The model simulations indicate that more tidal energy propagates into the estuarine system in 1994 because of the substantial increase in river cross‐sections. The limits of salt intrusion in 1994 extended farther inland than those in 1978. On the other hand, the extent of mangrove wetland in the lower estuary has increased over the past 20 years and is likely a result of the increased salinity in the estuary.     

GROUNDSURFACE WATER INTERACTION IN THE LONG ISLAND AQUIFER SYSTEM1

Steady state experimental studies with a viscous analog of the aquifer system in central Long Island, New York, have shown there to be significant interaction between surface accretion, stream base flow, well recharge, and the degree of salt water intrusion. Reductions in accretion are found to cause a proportionately larger decrease in stream base flow. The degree of intrusion is found to be related to the distribution of accretion and well recharge between stream base flow and submarine flow to the sea. This interaction poses a conflict between development of the groundwater resource and maintenance of the surface water resource. Well recharge apparently offers a potential solution to the conflict.