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Intervertebral discs (IVD) are fibro-cartilages situated between vertebrae providing their joint flexibility. They play a major role in the transmission and absorption of load through the spine. The disc can undergo progressive structural and quantitative changes in its composition and ... Mehr lesen
高温气冷堆中使用了大量的碳素材料，作为多孔材料，碳素材料含有一定水分等杂质。为了减小反应堆高温运行条件下的堆内材料腐蚀，高温堆在初装堆和事故后需要对一回路进行严格的加热除湿操作。目前一回路加热除湿主要是依靠主氦风机旋转，将动能转换为热能来提升温度。本文将采取另外一种方案，在蒸汽发生器处增加外加热源来加热一回路工质。基于大型商用软件COMSOL Multiphysics建立高温堆内一回路加热的流动传热模型，对两种加热方案的一回路升温过程作数值分析，为高温堆加热除湿方案的选择提供有益的指导。本文中使用的物理场为传热——共轭传热——湍流，多物理场耦合为非等温流动。 Mehr lesen
To reduce friction in lubricated tribological contacts, the surfaces of the contacting bodies can be microstructured to improve lubricating conditions. For lower loaded contacts this approach has already reached industrial applications, e.g. the piston-liner contact. For higher loaded ... Mehr lesen
Digital Microfluidic Biochip (DMFB) has been widely used in Lab-on-a-Chip (LoC) for disease diagnosis and treatment applications. To quickly convert traditional analog fluidic sample into digital droplets for DMFB processing, a high-throughput microfluidic droplet dispenser device is ... Mehr lesen
Pioneering Computational Models for the Built Environment Energy performance is becoming more important in the build environment. With better insulated buildings, the possibility of moisture problems and thermal bridges increases. There for, it is not only important to determine the ... Mehr lesen
“页岩气革命”使美国成功摆脱了对他国能源的严重依赖，目前我国页岩气的勘探开发也已取得了突破性成果，但是随着页岩气的开发，仍存在三大问题困扰着科学工作者和现场工程师：（1）页岩气开发过程中的渗透率演化规律尚未摸清；（2）在产气过程中，页岩气在产量上往往呈现出不确定性；（3）缺乏针对页岩气进行历史拟合和产量预测的数学工具。针对以上三个主要问题，我们定义非常规储层固有渗透率的演化是裂隙和基质之间物质传输和应力传递的结果，并建立了离散体模型研究孔隙变形与流体流动之间的耦合作用；以此为基础，我们建立双基质双重孔隙介质模型（连续介质模型）研究页岩基质变形与流体流动之间的耦合关系 ... Mehr lesen
In this numerical study, surface acoustic waves (SAWs) are evaluated as a potential disruptive flow technology for enhancing heat transfer in microchannels. Using COMSOL Multiphysics® software, the physics governing acoustics, single-phase-fluid flow and heat transfer are coupled. The ... Mehr lesen
A new regulation for the safety assessment of dams has just been developed in Italy and its approval process is still in progress. As a matter of fact the behaviour of dams under seismic loading conditions is deemed of actual interest due to the recent seismic events occurred. In ... Mehr lesen
Geothermal systems represent a large resource that can provide, with a reasonable investment, a very high and cost-effective power generating capacity. Despite its unquestionable potential, geothermal exploitation has long been perceived as limited, mainly because of the dependence from ... Mehr lesen