基于肤色特征的AdaBoost人脸检测方法①

针对人脸检测准确率和实时性问题,提出了一种基于肤色特征的AdaBoost检测方法。通过将肤色特征应用到AdaBoost检测算法中,提高AdaBoost算法的检测率。实验结果表明,该算法能更好地实现多人脸检测,且减少计算量,保障了实时性的要求。     

Biodiesel fuel production with solid amorphous-zirconia catalysis in fixed bed reactor

Amorphous zirconia catalysts, titanium-, aluminum-, and potassium-doped zirconias, were prepared and evaluated in the transesterification of soybean oil with methanol at 250 °C, and the esterification of n-octanoic acid with methanol at 175–200 °C. Titanium- and aluminum-doped zirconias are promising solid catalysts for the production of biodiesel fuels from soybean oil because of their high performance, with over 95% conversion in both of the esterifications.     

非体力劳动男性静态平衡功能的研究

检测从事非体力劳动男性的静态平衡功能,探讨该人群各年龄段的平衡差异.采用自行研制的便携式人体平衡测试系统对15～65岁的男性人群(N=50)进行平衡功能检测.将该人群划分为5个年龄段,分别分析4种检测姿势(双脚睁眼和闭眼站立、睁眼单脚站立)总轨迹长度(Lng)、左右平均动摇速度(Vx)、前后平均动摇速度(Vy)3个观察...     

Preparation of gold/polyaniline/multiwall carbon nanotube nanocomposites and application in ammonia gas detection

Composites of multiwall carbon nanotubes (MWNTs), polyaniline (PANI), and gold nanoparticles were prepared by one pot synthesis. Based on the interaction between aniline monomers and MWNTs, aniline molecules were adsorbed and polymerized on the surface of MWNTs. The nanocomposites were characterized by transmission electron microscopy (TEM), X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoemission spectroscopy (XPS). The sensors based on Au/PANI/MWNT nanocomposites were tested for on-line monitoring of ammonia gas. The results show that the as-prepared sensors have superior sensitivity, and good repeatability upon repeated exposure to ammonia gas.     

Highly porous CdO nanowires: preparation based on hydroxy- and carbonate-containing cadmium compound precursor nanowires, gas sensing and optical properties

Highly porous cadmium oxide (CdO) nanowires have been prepared by calcining the hydroxy-?and carbonate-containing cadmium compound precursor nanowires. The large-scale precursor nanowires were synthesized through a hydrothermal method. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were employed to characterize and analyze the as-synthesized precursor nanowires as well as the calcined products. It was revealed that the wire-like morphology of the precursor was fundamentally retained during the process of calcination and the CdO nanowires obtained were polycrystalline with highly porous structures. In order to illustrate the formation mechanism of the porous structures, the morphology and composition evolutions of the precursor nanowires under different stages of the calcining process were further investigated via SEM, x-ray diffraction (XRD) and infrared (IR) absorbance spectroscopy. Gas sensing has been explored for the sensor device fabricated with highly porous CdO nanowires, which demonstrates that it has good response owing to its special structures and great selectivity to NO(x). Furthermore, the UV-visible and photoluminescence spectra of highly porous CdO nanowires have also been investigated.     

Template synthesis, organic gas-sensing and optical properties of hollow and porous In(2)O(3) nanospheres

Hollow and porous In(2)O(3) nanospheres have been prepared by the hydrolysis of InCl(3) using carbonaceous spheres as templates in combination with calcination. Based on the observation of scanning electronic microscopy (SEM) and transmission electron microscopy (TEM), it has been revealed that the as-prepared In(2)O(3) nanospheres have a uniform diameter of around 200?nm and hollow structures with thin shells of about 30 nm consisting of numerous nanocrystals and nanopores. Owing to the hollow and porous structures, In(2)O(3) nanospheres possessing more active surface area exhibit a good response and reversibility to some organic gases such as methanol, alcohol, acetone and ethyl ether. In addition, the response mechanism of hollow and porous In(2)O(3) nanospheres to organic gases has been proposed. Furthermore, these prepared In(2)O(3) spheres showed a UV-visible absorption peak centered at around 309?nm, and their photoluminescence spectra have also been investigated.     

三维锥束重建中滤波器的设计

设计了几种用于CT三维锥束图像重建的滤波器,并将其对图像质量的影响进行了分析。CT是一种先进的成像技术,现已被应用于多个领域。CT图像重建算法多采用滤波反投影法,滤波是此方法的核心部分。本文介绍了三维锥束近似重建的基本原理,分析并设计了几种用于CT锥束图像重建的滤波器,并且通过投影数据的图像重建结果分析了不同滤波函数对断层图像重建质量的影响。实验结果证明：所设计的几种滤波器能较好的满足实际图像重建的要求。     

一种基于多线程的三维力平台数据采集方案设计

介绍了三维力测力平台的系统结构,提出了一种基于多线程的数据采集系统设计方案,详细阐述了数据采集系统的设计思路,实现方法,以及系统的程序流程。在系统中通过采用两个独立的线程,分别实现数据采集与数据融合显示,线程之间通过数据共享相互关联,通过互斥、基于优先级的调度等方法进行控制。经实验测试表明,系统结果正确,工作稳定,实时性与可靠均较好,较成功地满足了三维力测力平台数据采集的需要,具有较好的实用性。     

基于SnO2-La2O3掺杂的敏感材料CO2气敏特性研究

以半导体氧化物SnO2为基体材料加入40％的活性La2O3材料,制备出了对CO2具有敏感性的气体敏感材料,其检测体积分数范围为(0～5000) ×10-6.实验结果表明:在SnO2-La2O3敏感材料的基础上掺杂适量CeO2,Ag2O,SiO2等氧化物,不仅提高了其对CO2气体的灵敏度,而且可以提高其稳定性,从而大大改...