Influence of temperature and humidity on similar material and its control measures

Similar-material simulation is generally used in mining engineering. The properties of a similar material vary over time in a certain environment. Due to the time-varying characteristics of the material strength, the model and prototype is dissimilar in dynamics and kinematics, which may affect the reliability of simulation results. The present paper conducts block experiments that investigate the time-varying characteristics of the material strength. The paper further investigates methods of reducing the effects of time-varying characteristics of material strength on simulation results and extends the effective monitoring time of the similar-material model in a natural environment and an environment having constant temperature and humidity. The following results are obtained: (1) The strength and moisture content of the similar material have an exponential relationship, which can be divided into three phases. (2) When a similar-material model is laid in a natural environment, sampling and homemade monitoring equipment can be adopted to control the similar-material model’s strength. Meanwhile, homemade monitoring equipment for the relative humidity of the similar material can be used to monitor a critical change in the similar material’s moisture content. (3) An environment having constant temperature and humidity can extend the effective monitoring time of the similar-material model. (4) High humidity can extend the effective monitoring time while high temperature can decrease the effective monitoring time. In an experiment, the temperature and humidity under the environment of constant temperature and humidity and monitoring time of the model should both be set reasonably. Results provide guidelines for setting the model monitoring period and give evidence for the reliability of simulation results.     

涉及江苏省的几个重大地质问题

从大陆岩石圈动力学角度 ,提出了江苏基础地质科学研究所面临的主要前沿问题 ,如 :造山带、超高压变质带、花岗岩侵入机制、大面积分布的中生代火山岩的形成等。并对此作了总体上的分析 ,提出了个人见解。认为从中生代开始 ,不能不考虑古太平洋板块的巨大作用和影响。在考虑大陆地壳动力学时 ,必须考虑大洋地壳运动学 ;考虑大陆地壳增生时 ,同时要考虑洋壳的增生及消亡 ;考虑陆壳和洋壳动力时离不开岩石圈下面软流层的动力学     

潜艇作战系统数字孪生体应用需求分析

目前潜艇作战系统数字孪生体的有关研究并不多见,在对数字孪生技术概念内涵进行描述的基础上,结合潜艇作战系统全寿命周期,对其数字孪生体的军事应用需求进行了深入分析,提出了有关应用面临的问题并探讨了解决思路及方法,可为潜艇作战系统数字孪生体的方案设计提供参考借鉴.     

基于遥感的丁字湾地区土地利用时空变化分析及地区生态修复建议

丁字湾地区是山东半岛蓝色经济区划9大核心区之一,是胶东经济圈一体化建设的焦点,发展远景广阔。本文选取2005年、2010年、2016年三期TM影像进行遥感解译研究丁字湾地区土地利用变化特征及其空间分布。研究结果表明,丁字湾地区土地利用类型以耕地为主,2005—2016年间建设用地、草地的面积显著增加,水域、海域面积大幅减少。土地的转移主要发生在"建设用地与耕地、耕地与水域、养殖盐田与海域、草地与养殖盐田"之间。城乡建设的不断发展,也给丁字湾地区带来了海岸侵蚀、海水入侵等生态环境负面影响。建议在湾口地区开展"退围还海、退养还滩、退耕还湿"等海岸整治修复工作后,发展人地环境和谐的生态旅游经济。     

航空布雷训练装备现状及功能需求

随着实战化训练持续深入,海军航空兵布雷能力训练的难度和强度日益加大,传统航空布雷训练装备难以适应新形势的要求.从航空布雷训练装备的现状出发,梳理了当前3种训练装备的训练功能和特点.在此基础上,结合航空水雷作战效能评估需要,分析了当前训练装备在训练和评估方面存在的主要问题及影响,并从满足实战化航空布雷训练和效能评估的要求...