Java手机在污染源数据采集中的应用研究

针对当前大多数污染源数据采集与处理分步进行的现状,本文开展基于Java手机进行污染源数据无线移动采集与传输的研究,设计了数据采集和传输系统的整体框架结构,包括移动数据采集机制、数据采集模块功能和传输模块功能设计,并深入探讨了移动采集的实现方法,以及程序设计与原型系统实现。试验结果证明,本文的研究方案是有效的和可行的。     

基于LabVIEW的GTEM Cell辐射干扰自动测试系统设计

组建了在GTEM Cell内测量辐射干扰自动测试系统,采用E7402A频谱仪作为测量接收机,82357A USB/GPIB接口卡作为频谱仪与计算机数据传输通道。用LabVIEW图形化开发工具作为测试程序设计平台,开发了自动测试系统。该系统能自动完成对EUT（受试设备）总的辐射功率测试,并计算EUT在OATS上的辐射场强,提高了测试工作的效率和精确度,具有很强的应用价值。     

Effects of nanoparticles on the nucleation and devitrification temperatures of polyol cryoprotectant solutions

To investigate the efficiency of nanoparticles as nucleation agents in polyol cryoprotectant solutions at cryogenic temperatures, the nucleation and devitrification temperatures of these solutions with different concentrations of diamond, gold, copper–nickel, and silicon nanoparticles were measured through differential scanning calorimetry. The results show that ice growth in these cryoprotectant solutions is prominently accelerated by nanoparticles and the devitrification temperatures of cryoprotectant solutions are significantly lowered by nanoparticles. These findings can be used to improve the efficiency of cell cryopreservation procedures and open numerous avenues of investigations regarding the application of nanoparticles in cryogenics.     

基于中国传统龙椅文化的现代家具设计研究

"龙椅"是一个具有强烈民族情感的词语,在现代椅子的设计中出现大量以"龙椅"为创作元素的作品,本研究通过对这种艺术现象的成因分析,寻找现代中式家具设计的文化道路.     

重组家蚕抗菌肽CM4对癌细胞骨架及核骨架破坏作用的观察

报道了重组家蚕抗菌肽ＣＭ４对离体Ｕ９３７,Ｈｅｌａ癌细胞骨架及核骨架损伤作用的扫描电镜观察。随着时间的延长,经重组家蚕抗菌肽ＣＭ４作用后的癌细胞骨架散乱,断裂,萎缩成团状;癌细胞呆断裂,部分凝聚成团,结构不完整。重组家蚕抗菌肽ＣＭ４与正常人白细胞作用后细胞骨架及核骨架未见损伤现象。     

轿车用燃料电池发动机温度控制系统研究

针对燃料电池在工作过程中对温度的特殊要求,设计了一种温度控制系统,使得燃料电池工作于最佳的状态。实际系统中,利用单片机MC9S12DP256B作为主控芯片,控制质子交换膜燃料电池的温度、氢气、空气、水等系统。主控芯片采集温度信号,根据模糊控制策略产生控制量,通过125kbps波特率的CAN总线传送给风扇控制器,产生PWM波驱动散热风扇以不同转速工作。此系统应用于同济大学“超越2号”“超越3号”燃料电池轿车中,取得了良好的效果。     

基于数学模型的微细发泡注塑成型工艺与微泡关系的研究

研究了微细发泡注塑成型工艺中微泡长大的数学模型,建立了成型工艺和微泡尺寸之间的数学关系。在对该数学模型进行数值分析的基础上,着重研究了熔体温度、注塑时间、模具温度、初始填充量对微泡尺寸的影响。     

PS/SCCO2发泡体系挤出胀大和泡孔平均直径预测模型

运用正交试验和统计相结合的方法,研究了温度、压力、剪切速率、发泡剂含量对聚苯乙烯/超临界CO2发泡体系挤出胀大和泡孔的影响;综合胀大比和毛细管数的关系,提出了聚苯乙烯/超临界CO2发泡体系挤出胀大和泡孔平均直径预测模型。与实验结果相比,发泡体系挤出胀大的预测值与实验测量结果的误差在5%左右,泡孔平均直径的预测值与实验测量值的误差在10%左右。     

超临界CO2制备微孔聚碳酸酯及其泡孔特性研究

采用超临界微孔发泡技术制备出一系列聚碳酸酯微孔泡沫塑料,通过扫描电子显微镜、密度测试等方法研究了发泡温度和发泡时间对聚碳酸酯微孔泡沫塑料泡孔特性和体积密度的影响。结果表明,在测试范围内,随发泡温度的升高,泡孔密度增加,泡孔孔径先增加后降低,体积密度降低;随发泡时间的增加,泡孔密度和孔径均增加,体积密度降低。     

Microwave tomography for breast cancer detection on Cell broadband engine processors

Microwave tomography (MT) is a safe screening modality that can be used for breast cancer detection. The technique uses the dielectric property contrasts between different breast tissues at microwave frequencies to determine the existence of abnormalities. Our proposed MT approach is an iterative process that involves two algorithms: Finite-Difference Time-Domain (FDTD) and Genetic Algorithm (GA). It is a compute intensive problem: (i) the number of iterations can be quite large to detect small tumors; (ii) many fine-grained computations and discretizations of the object under screening are required for accuracy. In our earlier work, we developed a parallel algorithm for microwave tomography on CPU-based homogeneous, multi-core, distributed memory machines. The performance improvement was limited due to communication and synchronization latencies inherent in the algorithm. In this paper, we exploit the parallelism of microwave tomography on the Cell BE processor. Since FDTD is a numerical technique with regular memory accesses, intensive floating point operations and SIMD type operations, the algorithm can be efficiently mapped on the Cell processor achieving significant performance. The initial implementation of FDTD on Cell BE with 8 SPEs is 2.9 times faster than an eight node shared memory machine and 1.45 times faster than an eight node distributed memory machine. In this work, we modify the FDTD algorithm by overlapping computations with communications during asynchronous DMA transfers. The modified algorithm also orchestrates the computations to fully use data between DMA transfers to increase the computation-to-communication ratio. We see 54% improvement on 8 SPEs (27.9% on 1 SPE) for the modified FDTD in comparison to our original FDTD algorithm on Cell BE. We further reduce the synchronization latency between GA and FDTD by using mechanisms such as double buffering. We also propose a performance prediction model based on DMA transfers, number of instructions and operations, the processor frequency and DMA bandwidth. We show that the execution time from our prediction model is comparable (within 0.5 s difference) with the execution time of the experimental results on one SPE.