《植物学》课程实习立体教学模式的构建与研究

结合野外实习的经验,从多方面对现有的实习内容及教学方式进行改革和创新,提出了研究型野外实习立体教学模式.该模式主要包括实习基地的选择与建立,教学指导思想与教学原则的转变,实习前期、中期、后期中具体工作的开展,教学模式的评价等内容.模式的实施有利于培养和提高学生的科学研究素质和实践创新能力,同时取得较好的教学效果,受到同行专家和广大学生的肯定.     

二维散热条件对混凝土内部温度梯度及热传输的影响

为了获得二维散热条件下混凝土内部的温度分布情况,采用埋入温度传感器的方法,从水化温度峰值开始测量了混凝土试件内部不同位置的温度变化.结果表明,二维散热条件下,混凝土内部温度受到2个方向上的散热影响.越接近试件表面的位置,其温度随时间的增加下降得越快,产生的温度梯度越大,因此造成温度应力更大;在快速降温阶段,即从终凝到6...     

橡胶改性沥青储存稳定性试验研究

制作了普通橡胶沥青和脱硫橡胶沥青,并进行了不同储存温度或不同储存时间条件下2种橡胶改性沥青的稳定性试验.研究表明,脱硫橡胶沥青经高温静态储存后比普通橡胶沥青更易离析.经过高速剪切工艺,大颗粒的脱硫橡胶粒在沥青里大多分散成无明显颗粒的细小物质,其胶粉颗粒大小在2种橡胶沥青的性能比较中不产生影响;而普通橡胶粉剪切后基本保持...     

YVO4/Nd:YVO4/YVO4/KTP作为激光器工作介质的理论分析

基于LD端面泵浦键合晶体YVO4/Nd:YVO4的工作特点,提出了将YVO4/Nd:YVO4/YVO4/KTP作为绿光激光器的工作介质.通过运用matlab编程计算得出了 z=12 mmYVO4/Nd:YVO4/YVO4/KTP的最大形变量为17 pm,论证了KTP晶体与激光晶体键合不会因为热应力分布不均而产生间隙甚至断裂,从而得出在YVO4/Nd:YVO4/YVO4的后端面键合KTP作为激光器的工作介质是可行的.     

SPH方法与Height Field方法相结合实现的水体的实时仿真

提出了一种基于能量守恒的SPH水体与height field水面交互的算法,着重解决了SPH水体与高度场水面之间交互时的快速渲染问题.     

传统加热和微波加热下氧化锰矿的碳热还原行为研究

For the purpose of exploring a potential process to produce FeMn, the effects of microwave heating on the carbothermal reduction characteristics of oxidized Mn ore was investigated. The microwave heating curve of the mixture of oxidized Mn ore and coke was analyzed in association with the characterization of dielectric properties. The comparative experiments were conducted on the carbothermal reductions through conventional and microwave heatings at temperatures ranging from 973 to 1373 K. The thermogravimetric analysis showed that carbothermal reactions under microwave heating proceeded to a greater extent and at a faster pace compared with those under conventional heating. The metal phases were observed in the microstructures only under microwave heating. The carbothermal reduction process under microwave heating was discussed. The electric and magnetic susceptibility differences were introduced into the thermodynamics analysis for the formation of metal Mn. The developed thermodynamics considered that microwave heating could make the reduction of MnO to Mn more accessible and increase the reduction extent.     

二维双相介质波动方程反演的共轭梯度法

针对二维双相介质波动方程反问题,将大范围收敛的同伦方法与求解大规模优化问题的共轭梯度法有机结合,并引入求解不适定问题的Tikhonov正则化方法,构造出正则化-同伦-共轭梯度法.数值实验结果表明了该方法能有效地处理非线性的、不适定的地震勘探反演问题.     

Active tactile exploration using a brain-machine-brain interface

Brain-machine interfaces use neuronal activity recorded from the brain to establish direct communication with external actuators, such as prosthetic arms. It is hoped that brain-machine interfaces can be used to restore the normal sensorimotor functions of the limbs, but so far they have lacked tactile sensation. Here we report the operation of a brain-machine-brain interface (BMBI) that both controls the exploratory reaching movements of an actuator and allows signalling of artificial tactile feedback through intracortical microstimulation (ICMS) of the primary somatosensory cortex. Monkeys performed an active exploration task in which an actuator (a computer cursor or a virtual-reality arm) was moved using a BMBI that derived motor commands from neuronal ensemble activity recorded in the primary motor cortex. ICMS feedback occurred whenever the actuator touched virtual objects. Temporal patterns of ICMS encoded the artificial tactile properties of each object. Neuronal recordings and ICMS epochs were temporally multiplexed to avoid interference. Two monkeys operated this BMBI to search for and distinguish one of three visually identical objects, using the virtual-reality arm to identify the unique artificial texture associated with each. These results suggest that clinical motor neuroprostheses might benefit from the addition of ICMS feedback to generate artificial somatic perceptions associated with mechanical, robotic or even virtual prostheses.     

解决模糊冗余分配问题的遗传算法

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肖像绘制机器人的漫画处理方法

针对肖像漫画绘制的特点,提出一种自动参数化曲面透镜算法.通过此算法对人脸照片进行自动变形处理,得到针对特征的漫画化人脸图像.然后,进行矢量化处理,生成机器人绘画的运动轨迹.用1台自制的绘画机器人,在白纸上完成了肖像漫画的自动绘制.实验结果表明,该肖像漫画绘制机器人系统达到了人脸图像漫画处理的效果.