Daily natural heat convection in a historical hall

The use of numerical simulation methods for the Cultural Heritage is of increasing importance for the analysis, conservation, restoration and appreciation of works of art. This is particularly important when their preservation and planned maintenance is the primary aim. Today museums, and particularly historical buildings converted to museums, should be considered as places where precious artefacts should have first-rate protection and conservation. It is a question of solving the compromise between protection, conservation and comfort for works of art and/or visitors, with the consequence that preservation and planned maintenance criteria must prevail over use requirements. Refurbishment and conservation of a building, and requirements for visitor presence and works of art need different thermo-physical indoor parameter values. The present paper concerns the thermal and air velocity analysis of the Salone dei Duecento (the Hall of the Two Hundred of the Palazzo Vecchio (Old Palace)) in Florence. In this paper an appropriate transient 3D model by Computational Fluid Dynamics (CFD) software based on the finite element method (FEM) was used. Variations and interaction between indoor and outdoor microclimatic conditions, and thermo-physical behaviour of the building connected to lighting, visitor presence and cooling–heating fan coils system were considered. The 3D modelling method provided by the present paper can be applied to several situations where there is interaction between outdoor and indoor climate variations and the building structure. It can be very useful for defining measures to preserve tapestries, understanding deterioration processes, and developing new conservation techniques and strategies for care and exhibition.     

基于Witness 2003仿真技术的图书馆服务系统的仿真实现及优化分析

以一高校图书馆流通部的服务系统为实例进行分析，建立了一个图书馆服务系统模型；针对传统排队理论在复杂服务系统中应用的局限性——单阶段服务或系列服务中的一个阶段服务各自都是独立的，利用 Witness 2003高级仿真技术为该图书馆流通部建立一个服务系统仿真模型，实现了对影响排队系统的内在因素（服务台服务效率）和外在因素（书库读者流输出的服务请求）的有效整合；根据仿真系统在仿真钟时间内运行后的服务系统绩效参数报表，进行优化分析，并结合资源稀缺性的现实问题，为现有系统提出了优化方案。     

船舶电站多种发电方式的联合运行仿真系统分布式结构的实现

简要介绍已研制完成的船舶电站多种发电方式联合运行仿真系统的总体组成,主要阐述仿真系统分布式结构的设计以及实现,简要说明分布式船舶电站多种发电方式联合运行仿真系统的特色和成果。系统采用了分布式结构,由下位机完成各自的柴油发电机组、轴带发电机组、透平发电机组的仿真,并由上位机实现电力管理,通过通信实现多种发电方式联合运行仿真。构成嵌入式物理一数学仿真,提高仿真设备实时、可靠性,改善了系统性能。     

冷藏集装箱漏热试验分析

对某研究中心的冷藏集装箱进行漏热测试,通过试验中心自己编写的测试程序传输记录试验数据,并把数据通过计算机界面显示,然后对结果进行分析讨论.实验结果表明该实验中心的冷藏集装箱具有可靠的性能.     

理论力学课程教学中的MATLAB应用研究

在物理专业本科课程的理论力学教学中引入了非线性力学,传统的教学方式受到严峻的挑战。配合教材开设以数学软件MATLAB为学习工具的理论力学计算机模拟实验,让学生在自主探索式学习过程中掌握用数学软件来计算与模拟理论力学中一些难以理解的非线性问题。     

坦克装甲车辆机动性虚拟仿真实验设计与实现

围绕坦克装甲车辆领域人才培养的需求,突出学科优势与专业特色,依托相关领域的科研和教学成果,基于Unity 3 D开发了坦克装甲车辆机动性虚拟仿真实验.坦克装甲车辆机动性虚拟仿真该实验利用虚拟仿真手段重现了高仿真度的实验环境与测试过程,为学生提供了开放的实践条件,并支持学生独立自主地进行机动性实验研究与探索,为装甲车辆工...     

Index of microcirculatory resistance: state-of-the-art and potential applications in computational simulation of coronary artery disease

The dysfunction of coronary microcirculation is an important cause of coronary artery disease (CAD). The index of microcirculatory resistance (IMR) is a quantitative evaluation of coronary microcirculatory function, which provides a significant reference for the prediction, diagnosis, treatment, and prognosis of CAD. IMR also plays a key role in investigating the interaction between epicardial and microcirculatory dysfunctions, and is closely associated with coronary hemodynamic parameters such as flow rate, distal coronary pressure, and aortic pressure, which have been widely applied in computational studies of CAD. However, there is currently a lack of consensus across studies on the normal and pathological ranges of IMR. The relationships between IMR and coronary hemodynamic parameters have not been accurately quantified, which limits the application of IMR in computational CAD studies. In this paper, we discuss the research gaps between IMR and its potential applications in the computational simulation of CAD. Computational simulation based on the combination of IMR and other hemodynamic parameters is a promising technology to improve the diagnosis and guide clinical trials of CAD.     

时间语义加工中内隐空间图式的激活机制

本研究采用实验方法考察时间语义理解中内隐空间图式的激活,借此探讨感知运动经验在抽象语义加工中的作用.实验发现,时间语义加工会激活左右空间编码,引起注意力向时空隐喻映射一致的方向转移(左/早,右/晚).过去时间引起注意力向左转移,促进左侧目标的识别,未来时间引起注意力向右转移,促进左侧目标的识别.实验表明,时间语义加工会...     

复杂物质循环过程模拟方法与平台实现——以畜禽养殖系统磷循环为例

物质循环是人类获取资源的重要方式,尤其是对于磷这种地球生物生存不可或缺、不可替代的资源,理解其循环过程对资源可持续利用乃至人类永续发展具有重要意义.目前关于物质循环的研究多采用物质流分析方法,该方法是一种以物质流动过程质量守恒为基础、以系统分析为手段的定量核算方法,需要将系统物质流动路径与核算模型融为一体.为了解决传统...     

旋转整流器式无刷电机加载泄载动态响应特性研究

详细分析、介绍了新研制的15KVA旋转整流器式无刷直流同步拓扑结构、工作原理,并给出了其参数设计要点、实现方法及样机实验数据和Saber仿真波形。结果表明,该系统具有可靠性高、体积小、重量轻及电气性能好,可长期连续运行而不需要保养等特点,对无人驾驶机设计制造有较好的应用前景。