Chemical simulation teaching system based on virtual reality and gesture interaction

Background Most existing chemical experiment teaching systems lack solid immersive experiences,making it difficult to engage students.To address these challenges,we propose a chemical simulation teaching system based on virtual reality and gesture interaction.Methods The parameters of the models were obtained through actual investigation,whereby Blender and 3DS MAX were used to model and import these parameters into a physics engine.By establishing an interface for the physics engine,gesture interaction hardware,and virtual reality(VR)helmet,a highly realistic chemical experiment environment was created.Using code script logic,particle systems,as well as other systems,chemical phenomena were simulated.Furthermore,we created an online teaching platform using streaming media and databases to address the problems of distance teaching.Results The proposed system was evaluated against two mainstream products in the market.In the experiments,the proposed system outperformed the other products in terms of fidelity and practicality.Conclusions The proposed system which offers realistic simulations and practicability,can help improve the high school chemistry experimental education.

Research on Interactive Simulation Experiment Platform and Remote Simulation System Under Web Environment

This paper brings forward a method of experimental teaching reform of universities and colleges,which establishes an interactive simulation experiment platform with MATLAB simulation software.The platform uses visual man-machine interface,which avoids a lot of programming and debugging work,and improves students’learning enthusiasm.Simultaneously,it implements remote simulation based on JAVA under web environment,which is convenient for network teaching,and improves flexibility and practicability of the simulation experiment platform.

Overview of the South China Sea Monsoon Experiment

The present paper gives an overview of the key project ' South China Sea Monsoon Experiment (SCSMEX)' operated by the Ministry of Science and Technology of China during the period of 1996-2001. The SCSMEX is a joint atmospheric and oceanic field experiment which aims to better understand the onset, maintenance, and variability of the summer monsoon over the South China Sea (SCS). It is a large-scale international effort with many participating countries and regions cooperatively involved in this experiment. With the field observation in May-August 1998, a large amount of meteorological and oceanic data was acquired, which provides excellent datasets for the study of the SCS monsoon and the East Asian monsoon and their interaction with the ocean. The preliminary research achievements are as follows. (1) The earliest onset of the Asian monsoon over the SCS and Indo-China Peninsula has been well documented. Prom the viewpoint of the synoptic process, its onset is closely related to the early rapid development of a twin cyclone to the east of Sri Lanka. The conceptual modei of the SCS monsoon onset in 1998 was put forward. The 50-year time series of the SCS monsoon onset date was also made. (2) Two major modes, namely the 30-60-day and 10-20-day oscillations were ascertained. The influences of the abnormal SCS monsoon on the precipitation over eastern China and its modes were identifled. A strong (weak) monsoon over the SCS usually leads to less (more) precipitation over the middle and lower reaches of the Yangtze River basin, and more (less) precipitation in North China. (3) During the monsoon onset over the SCS, a wide variety of organized mesoscale convective systems (MCSs) were observed by a Doppler radar array deployed over the northern SCS. The relationship between large-scale circulations and MCSs during the monsoon onset process in 1998 was clearly revealed. It was suggested that there is a kind of positive feedback mechanism between large-scale circulations and MCSs. (4) The SST over the SCS during the early period influences the timing of the monsoon onset date and the monsoon's intensity. During the monsoon onset, the ocean undergoes a process of energy release through air-sea interaction. During the break phase of the SCS monsoon, the ocean demonstrates the process of energy re-accumulation. Obvious differences in the air-sea turbulent flux exchange between the southern and northern parts of the SCS due to different characteristic features of the atmosphere and sea structure were observed in those regions. (5) The verification of impact of intensive observations on the predictive performance is made by the use of regional models. The air-sea coupled regional climate modei (CRCM) was also developed under the SCSMEX Project . The simulation of the oceanic circulation in 1998 produced with the modei was well compared with the observations.

Experimental and numerical study of the effect of pulsatile flow on wall displacement oscillation in a flexible lateral aneurysm model

This study experimentally and numerically investigated the effect of pulsatile flow of different frequencies and outflow resistance on wall deformation in a lateral aneurysm.A method for constructing a flexible aneurysm model was developed,and a self-designed piston pump was used to provide the pulsatile flow conditions.A fluid-structure interaction simulation was applied for comparison with and analysis of experimental findings.The maximum wall displacement oscillation increased as the pulsation frequency and outflow resistance increased,especially at the aneurysm dome.There is an obvious circular motion of the vortex center accompanying the periodic inflow fluctuation,and the pressure at the aneurysm dome at peak flow increased as the pulsatile flow frequency and terminal flow resistance increased.These results could explain why abnormal blood flow with high frequency and high outflow resistance is one of the risk factors for aneurysm rupture.

“四维互动”虚拟仿真实验教学体系的探索与实践

近年来,高校在各自专业基础上建立了各具特色的虚拟仿真实验教学体系。以暨南大学媒体实验中心为研究对象,经过多年探索与实践,逐步构建了“四维互动、循序渐进、知行合一、产学结合”一套具有自身特色的新闻传媒类虚拟仿真实验教学体系。同时,建立了8大虚拟仿真实验教学平台,加强培养学生基础能力,注重提高学生综合素质。实践表明,虚拟仿真实验教学既推动创新,激发了学生潜力;又开放共享,提升了教学质量;还推动了将科研成果转化为实验教学资源。

工程图学虚拟仿真模型系统设计及其教学分析

针对工科类专业工程测绘课程实验需求,基于云服务、虚拟模型技术和可视化仿真体验,开发了工程测绘虚拟仿真实验系统。该系统对工程测绘实验方案、互动环节和考核评价等内容的教学体系重构和数字化重建,以测绘对象三维建模代替零部件实物,降低实验教学成本投入;以虚拟实验室代替实际测绘实验室,减少实验室资源占用;以在线实验代替固定时间课内实验,提高课程教学灵活度。为校内外师生提供灵活交互、强沉浸感和高用户黏度的在线实验教学服务,驱动学生自主完成实验学习和在线互动等活动,从而使学生的空间思维、图感表达能力得到充分训练,有效提高学生的工程创新素质。

虚拟仿真实验建设中的互动模型研究

虚拟仿真实验建设涉及设计者、开发者和使用者,为促进三方全方位互动并融入实验建设的各个阶段,提出了一种“设计者—开发者—使用者”互动模型。实践表明,该模型能实现实验建设中三方信息的有效及时沟通,实现课程建设结果和教学需求之间的高度统一,有效促进高质量虚拟仿真实验建设。

Soil-structure interaction of unsymmetrical trench installation culvert

The computation of the design load on culverts in the current Chinese General Code for Design of Highway Bridges and Culverts （CGCDHBC）is primarily based on the linear earth pressure theory, which cannot accurately reflect the changes in vertical loads on trench installation culverts. So the changes in vertical earth pressure and soil arching effect in the backfill for an unsymmetrical trench installation culvert are studied based on a full scale experiment and finite element （FE） simulation. The variation laws of foundation pressure and settlement are also analyzed. Meanwhile, the influence of eccentric load induced by an unsymmetrical trench installation on the interaction of a soil- structure system is discussed. Results show that soil arch is formed when the backfill on the culvert reaches a certain height. It can relieve the earth pressure concentration on the crest of the culvert, but it is instable. The earth pressures obtained by full scale experiment and numerical simulation are greater than those calculated by the current CGCDHBC method. The eccentric load effect on the culvert has a significant influence on the stress states and deformation of the soil-structure system.

“以学生为中心,以矿业为特色”的工程力学虚拟仿真一流课程建设与实践

面向国家能源开发领域,立足于巷道工程有关的岩石力学前沿问题,创设了“以学生为中心,以矿业为特色”的工程力学虚拟仿真实验教学课程,构建了以教学目标为引导、以实验模块为主线、以实验内容为应用的课程体系,坚持“以学生为中心”的教学理念,采用多样化的教学方式,构建了沉浸式、体验式、探究式的学习场域,完善了开放共享的信息化实验教学新模式和新体系。课程建设与实践表明,本虚拟仿真实验课程有利于培养学生家国情怀、能源特质、创新思维和工程实践能力。

后生作用中膏岩对芳烃分布的影响及地化意义

【目的】硫酸盐与沉积有机质之间的反应是沉积盆地内一种典型的有机—无机相互作用类型。在后生作用早期,硫酸盐会影响沉积有机质的热演化。研究对应体系中芳烃化学组成的热演化规律,有助于理解其地球化学行为。【方法】以鄂尔多斯盆地西南缘平凉组烃源岩及其含硫干酪根为初始样品,通过含水体系热模拟实验方法研究了硫酸盐对干酪根热演化产物的影响。【结果】硫酸盐增加了早期可溶有机质产率,并使得芳烃族组分的生成高峰提前。另外,硫酸盐在后生作用阶段早期可氧化降解有机含硫化合物,减少了二苯并噻吩的生成,导致不同类型的芳烃化合物比例出现显著差异。因此,在生油高峰之前,硫酸盐和沉积有机质之间存在氧化降解反应阶段,其产物以含氧化合物等极性组分为主,二苯并噻吩均形成自有机硫化合物。【结论】该认识将硫酸盐与沉积有机质的反应范围拓展至了热应力更低的后生作用阶段含膏烃源岩。

基于UE4技术平台的赣南苏区红色文化遗址建筑群三维虚拟仿真关键技术研究

随着科技的发展,数字化技术在保护和传承文化遗产方面发挥着越来越重要的作用。红色文化遗址作为我国重要的文化遗产,具有独特的历史价值和文化意义。然而,由于这些遗址往往年代久远,且受到自然和人为因素的侵蚀,保护和传承难度较大。基于UE4技术平台的三维虚拟仿真技术为红色文化遗址的保护和传承提供新的解决方案。该文旨在探讨基于UE4技术平台的赣南苏区红色文化遗址建筑群三维虚拟仿真关键技术研究,以期为数字化保护和传承红色文化遗产提供理论和实践支持。

虚拟现实技术在建筑设计课程中的应用

阐述虚拟现实技术在建筑设计课程教学实践中的可行性和效果。通过提供直观的空间体验、实时交互和材料仿真功能,以及虚拟现实技术,帮助学生更好地理解和表达设计想法。

大数据下高维交互效应的序贯仿真变量识别及应用

随着大数据的到来,因子间的高维交互效应识别成为热门研究问题.为了解决该问题,对高效的Morris理论框架(EMM)进行扩展,提出了一种新的两阶段交互效应筛选方法(IEMM).IEMM充分利用计算机序贯特性,不仅可以高效识别出具有显著的主效应和交互效应和/或非线性效应的因子,而且可以进一步识别出因子间显著的交互效应(TIE).蒙特卡罗仿真结果表明,IEMM方法可以正确识别出EMM无法识别的TIE,并且与传统的识别交互效应的MM方法(IMM)相比,IEMM识别TIE的计算效率更高.实际物流案例表明IEMM识别因子间交互效应可行且稳健,并且能够在不牺牲统计效力的情况下节省计算资源.

基于“虚实结合”实验的测量学课程互动式学习方法研究

通过“虚实结合”的混合式测量实验实训切实提高教师在教学过程中信息化运用的能力,通过实施“外引内培、校企互聘”方式建成一支校企协同、结构合理、教学能力强、工程经验丰富、年龄结构合理的虚实结合实训教师队伍,为测绘虚拟仿真实训平台建设提供有力保障;把实训教学与信息化技术深度融合,通过虚拟场景呈现教学内容,作为教材数字化资源实训内容有效补充。虚实结合,优化专业核心课程学习,提升了学生的核心竞争力;虚实互补,改进专业基础课学习,夯实了学生的专业基础。测量学课程实验虚拟仿真系统化,改革学习形式,促进了人才的个性化培养。

虚拟仿真实验的双主式互动教学模式研究--以电工电子技术课程为例

本文以现代机电行业实际岗位生产需求为参考,首先重点论述了高职电工电子教学现状,讨论了目前存在的实践教学上的不足,同时分析了虚拟仿真实验在高职电工电子教学中的优势,及其在实际应用中存在的困难。本文最后提出了虚拟仿真实验在电工电子教学中应用的优化策略,并用具体实例予以证明,以期为电工电子教学提供参考。

飞机起落架系统交互式虚拟仿真实验开发与应用研究

虚拟现实技术的应用能够使复杂民用飞机系统的工作原理实现三维深度可视化,能够有效解决飞机系统实物实验开展难度较大的问题。针对民用飞机系统类课程大纲中关于飞机起落架系统的工程实践学习要求,按照起落架元件、起落架系统以及起落架落震专题三个典型视角,采用虚拟仿真方法进行教学实验开发。基于飞机系统课程群面向现代民用飞机起落架系统的教学内容,充分考虑工程实际中起落架系统的关键技术特征,对其进行精细化模型还原,实现了交互式虚拟实验界面及操作流程设计,并在虚拟仿真实验教学中获得了良好的应用效果。

高校“航空公司运行安全”混合式课程建设研究与实践

“航空公司运行安全”是中国民航大学安全工程专业的特色主干课程,该课程原有教学方式过于陈旧,缺乏过程性考核,教学过程缺乏课程思政的引导,无法满足信息时代教育的要求和学生的学习需求。线上线下混合式教学能够激发学生学习的积极性、主动性和创造力,能够使传统课堂和在线教学相辅相成,形成优势互补,有效提升安全工程专业课程的教学质量。文章探索“航空公司运行安全”混合课程的建设策略,研究和实践以学生为中心、项目导向式的线上线下混合式教学模式,以提升学生的综合素质。

人工智能视听感知机器人虚拟仿真实验平台设计与应用

针对实体机器人价格昂贵、应用困难等问题,文中设计一种人工智能视听感知机器人虚拟仿真实验平台。该平台旨在培养学生运用人工智能技术去设计与开发基于视听觉感知信息控制机器人的能力,拓展学生跨学科知识,提升多专业综合应用能力和自主编程创新能力。通过将自主学习元素融入平台实验设计过程,教会学生运用汉字、语音、手势等方法控制虚拟与实体机器人,实现人工智能技术“理解-部署-调试-应用”一体化。文中对实验平台在实际教学中的应用进行详细介绍,并通过学生反馈给出实验平台的综合评价。

多学科交叉融合的虚拟仿真实验探索与实践

根据地学类专业新工科在人才培养中遇到的多学科交叉深度融合的实际情况,有效提高野外实习的教学效果,解决特定实习路线上典型岩石信息回看、采样难、检测成本高等问题,以兴城典型岩石综合观测教学系统为例,基于Unity3D开发虚拟现实实验环境,采用雷达互动投影技术,与投影显示用户界面相结合,实现了野外实习路线典型岩石多要素、全方位的认识与分析。学生可基于该系统与界面进行互动反馈,加深多学科知识的综合理解与运用。同时,开发的移动版本可在野外实习时反复对照查看,培养学生通过多种手段综合解决实际问题的能力。

球形和不规则粗颗粒流化行为相间相互作用实验和CFD模拟研究

流态化技术已广泛应用于选矿过程中粗颗粒(>74μm)的分离和回收。研究表明,流体动力学条件和相间相互作用是颗粒运动的主要影响条件。本文主要研究碰撞系数和阻力模型对液固流化床流体动力学行为的影响。为此,使用欧拉-欧拉方法,在计算中考虑了球形和不规则的粗颗粒;使用Gibilaro、Gidaspow、Huilin-Gidaspou和Syamlal-O’Brien方程获得曳力。此外,利用颗粒体积分数和床层膨胀比的实验数据对提出模型进行了评估。研究了3个恢复系数(0.85、0.90和0.99)和4个镜面系数(0.01、0.10、0.50和0.99)对颗粒流化行为的影响。结果表明,对于球形和不规则颗粒,Gidaspow和Hulin-Gidaspow模型在预测床层膨胀率和颗粒体积分数上与实验数据具有良好的一致性。最后,当恢复系数为0.90且镜面系数为0.10时,模拟结果与实验结果最为接近。研究结果提高了对粗颗粒在液固流态化中行为的认识,为进一步研究三相浮选过程提供有用的信息。