Acceptability of robotic technology in neuro-rehabilitation: Preliminary results on chronic stroke patients

During the last decade, different robotic devices have been developed for motor rehabilitation of stroke survivors. These devices have been shown to improve motor impairment and contribute to the understanding of mechanisms underlying motor recovery after a stroke. The assessment of the robotic technology for rehabilitation assumes great importance. The aim of this study is to present preliminary results on the assessment of the acceptability of the robotic technology for rehabilitation on a group of thirty-four chronic stroke patients. The results from questionnaires on the patients’ acceptability of two different robot-assisted rehabilitation scenarios show that the robotic approach was well accepted and tolerated by the patients.     

图像和视频油画风格化研究

图像和视频的油画风格化是计算机图形学中非真实感绘制的热点问题之一,在动漫、娱乐等领域有着较广泛的应用。回顾了图像和视频油画风格化绘制的发展过程,分类介绍了各种方法的特点,并比较了不同方法的优缺点。在此基础上,讨论了图像和视频油画风格化绘制存在的难点和可能的研究方向。     

二冲程润滑油与发动机的有害排放

燃料与润滑油是影响发动机排放的要素。对于二冲汽油机，润滑油与燃料混合，直接参与燃烧过程，其对发动机排放的影响更加直接。本文通过不同二冲程油对发动机排放性能的影响试验，提出了采用二冲程油来改善发动机排放的新途径。     

喷油泵校正器测量系统

根据喷油泵校正器技术参数的特点。研制开发了一套喷油泵校正器测量系统。论述了系统总体方案及硬件组成，对系统测量原理进行了详细的分析，介绍了系统软件的各个模块。实践证明，喷油泵校正器测量系统性能稳定、测量结果精确可靠，能够满足生产实践中对喷油泵校正器的测量要求。     

Curvature-based stroke rendering

This paper describes an algorithm that renders lines that have various thicknesses and have sharp tapered ends. This algorithm does not require any special information on each local point of a line. The thickness is determined by curvature and lengths from both ends. Therefore the algorithm is applicable in a variety of line rendering situations, such as 3D rendering engines for high quality cel-animation-like effects, reuse of geometrical data designed by CAD for advertising purposes, edge enhancement in a photo retouching process with edge detection methods and so on. In addition, using the generated varying thicknesses, we have developed algorithms for shading and embossing effects.     

二冲程微型摆式内燃机数据采集模块的研制

为满足便携式电子产品对高能量密度供电电源的要求,清华大学精密仪器与机械学系研究人员设计出了一种新型二冲程微型摆式内燃机(二冲程MFPSE:Two Stroke Micro Free Piston Swing Engine),以该内燃机项目为背景,设计了样机数据采集模块,对二冲程MFPSE工作腔的压力进行测量,依据采集的数据分析样机的密封效果是否良好。通过实验验证,该数据采集模块有效、可行,能较为真实地测量二冲程MFPSE各工作腔数据,为样机的进一步研究奠定了基础。     

A novel hydrogen engine one litre two stroke delivering top power 110 kW and brake efficiency 36% within the 25 kg total weight constraints

The paper presents a novel design for a viable two stroke hydrogen engine that delivers excellent fuel economy and low emissions within the constraints of today's cost, weight and size. The engine features asymmetrical port timing through a translating and rotating piston mechanism. The engine is externally scavenged and supercharged, has wet sump and oil pressure lubrication, direct injection, it is lightweight, easy to build, with minimal number of parts, low production cost, ability to be balanced and compact design. The two stroke mechanism produces a linear motion of the pistons as well as an elliptical path on the surface of the cylinder. This allows the piston to sweep as well as travel past the ports. The piston has a raised lip around portion of its circumference that communicates with the inlet and exhaust ports through its sweep and linear motion that assist in creating the port's asymmetry to make the exhaust port to open first and to close first. The inlet port opens approximately 23° after the exhaust port opens, and remains open for some 20° after the exhaust port closes. The inlet port remains open to complete the cylinder charging and allow supercharging. The piston generates a perfect sinusoidal motion. Direct fuel injection and jet ignition are adopted for best results over a wide range of speeds and loads. The load is controlled by the quantity of fuel injected and changing the supercharger speed through a continuously variable transmission. This paper includes design details as well as result of engine performance simulations. The engine has better than traditional two stroke engines (1) top brake efficiency in the high 30% range and (2) range of speed and loads where the efficiency is above 30%.     

怎样正确选择和调整离心泵

介绍了离心式水泵扬程和流量确定方法，并对扬程调整改造中的节能技术进行了探讨。     

注射机增力机构优化研究

对注射机五铰链斜排双曲肘增力机构进行了运动和力学特性分析,使用改进蚁群算法对该增力机构进行了优化设计,以机构行程比较大、力的放大倍数较大和机构总长较小为目标函数建立了优化数学模型,该优化设计属于多目标函数优化问题,通过对增力机构实例计算与传统设计方法进行了比较,结果表明机构总长减小的同时,行程比及力的放大倍数都有明显提高。     

高速插齿机主传动机构的优化设计

研究高速插齿机主传动机构的优化设计，与常规插齿机的曲柄滑块机构相比，该优化设计的六杆传动机构插齿刀行程可调、工作速度平稳、急回特性好。