Dynamic simulation of an opencast coal mine: a case study

Dynamic simulations are powerful tools,but only if they are developed using the correct methodology,and with information that has been verified.Mining houses rely on simulation to confirm that complex,integrated systems can achieve design capacity before investment decisions are made.Work conducted in the realm of validation can make an invaluable contribution to the success of future projects undertaken around the world.Coal mine a life of mine extension project was approved for implementation when export coal prices were on the low end of the price cycle.The dynamic simulation of the full materials handling value chain conducted during the project feasibility study in 2016 was of utmost importance and provided assurance to the project review team that annual production targets can be achieved.The simulation development methodology was based on a unique approach that reduced time spent on the simulation.Upon completion of project construction and commissioning in 2018,it was essential to validate the simulation,which could lead to the adoption of this approach on future projects.This paper explains the steps taken to validate the dynamic simulation.This case study confirmed that dynamic simulation can add value and predict mining system performance,such that informed decisions can be made.     

Kinetic Energy Harvesting Toward Battery-Free IoT:Fundamentals,Co-Design Necessity and Prospects

Energy harvesting(EH)technology is developed with the purpose of harnessing ambient energy in different physical forms.Although the available ambient energy is usually tiny,not comparable to the centralized power generation,it brings out the convenience of onsite power generation by drawing energy from local sources,which meets the emerging pow?er demand of long-lasting,extensively-deployed,and maintenance-free Internet of Things(IoT).Kinetic energy harvesting(KEH)is one of the most promising EH solutions toward the realization of battery-free IoT.The KEH-based battery-free IoT can be extensively deployed in the smart home,smart building,and smart city scenarios,enabling perceptivity,intelli?gence,and connectivity in many infrastructures.This paper gives a brief introduction to the configurations and basic principles of practical KEH-IoT systems,including their mechani?cal,electrical,and computing parts.Although there are already a few commercial products in some specific application markets,the understanding and practice in the co-design and optimization of a single KEH-IoT device are far from mature,let alone the conceived multia?gent energy-autonomous intelligent systems.Future research and development of the KEHIoT system beckons for more exchange and collaboration among mechanical,electrical,and computer engineers toward general design guidelines to cope with these interdisciplinary en?gineering problems.     

基于发展科学探究能力的高中化学教学实践 ——以"元素周期律"章节为例

基于学生在学习元素周期律时存在的普遍问题改进了教学实践,分析了元素周期律发展学生科学探究能力的价值,设计了四个教学环节——趣味导入,成果展示;分析规律,做出猜想;设计方案,收集证据;梳理模型,迁移应用,并提出了三点针对学生探究能力发展的教学建议.     

乳化沥青稀浆封层的应用

运用乳化沥青稀浆封层对原有道路进行预防性养护,可以改善施工条件及行车舒适度,降低造价提高生产效率,是解决道路养护技术的有效途径,具有显著的经济效益和社会效益.文章阐述乳化沥青稀浆封层的效用、材料的组成及质量要求,为乳化沥青稀浆封层的推广提供参考.     

声明

本刊已许可中国学术期刊(光盘版)电子杂志社(中国知网)、万方数据股份有限公司、重庆维普资讯有限公司、北京世纪超星信息技术发展有限责任公司、中教汇据(北京)科技有限公司在其系列数据库产品中以数字化方式复制、汇编、发行、信息网络传播本刊全文。著作权使用费与本刊稿酬一并支付。作者向本刊提交文章发表的行为即视为同意我刊上述声明。     

社会化媒体场域中 "科学"流言生成规律与治理逻辑分析 ——以2019年十大"科学"流言微博传播样本为个案

"科学"流言是网络流言中频发、极易引发舆情变动的类型."科学"流言传播规律的研究事关社会治理和网络舆情治理的成效.以2019年中国科学技术协会发布的十大"科学"流言在新浪微博平台的所有相关内容为研究对象,从关联性、重复性和生成方向分析社会化媒体平台中"科学"流言的生成特点.结果发现,后真相社会环境、易感人群的存在、单一的辟谣主体等因素促进了"科学"流言的产生和传播.由此提出"科学"流言治理的逻辑,即治理观、场域观、技术观和新时代科普观.     

水稻育种技术取得重大突破 新品种预计每亩增产100公斤

记者日前从科技部中国农村技术开发中心获悉,国家重点研发计划“七大农作物育种”重点专项“水稻全基因组选择与高产优质品种设计育种”成果围绕水稻理想株型与品质形成的分子机理这一重大科学问题取得了一系列关键突破。     

公告

《园林》获批变更为学术期刊。国内外公开发行,涉及风景园林学科的基础、应用基础、应用研究的学术期刊(月刊),主办单位为上海市园林科学规划研究院、中国风景园林学会。     

《造纸科学与技术》征订启事

《造纸科学与技术》是广东省造纸研究所主办的双月刊,是中国科技核心期刊(中国科技论文统计源期刊),大16K开本,逢双月出版。国内外公开发行,国内统一刊号CN44-1532/TS,国际标准刊号ISSN1671-4571。本刊报道范围为制浆造纸工业及其相关行业的理论和工艺研究、产品研发、装备制造等。