基于声源定位的高校在线巡课系统设计与研究

随着网络建设以及信息化教学方法在高校教学过程中的应用普及,越来越多的高校使用在线巡课系统对教师的教学过程进行跟踪和管理,以便发现课堂教学中的亮点、问题和不足。文章提出的在线巡课系统,基于声源定位的技术,对传统的在线巡课系统做出了改进,解决了已有巡课系统中“只闻其声,不见其人”的问题,能够更直观地跟踪到教师的教学过程,包括教学行为以及师生互动过程,有效提升教务人员巡课效果和体验感受。     

微型轴流风扇噪声特性分析及试验研究

本文对微型轴流风扇噪声的产生机理进行了系统分析及教育处，并进行了实验测试。得出的分析计算结果与实验数据作了比较验证，在声压随观测角度和距离的变化关系上，两者显示出基本一致的趋势。文中以等流量为前提，对降低微型风扇噪声的一种途径作了计算，结果表明采用转轴很细的风扇，可使噪声明显降低（大于3dB）。     

扩声系统在体育馆中的典型应用

针对体育馆举办不同类型的大型活动,分别对扩声系统的音质及扩声特点提出要求,以人声和乐器声的频率特性为依据,阐述了调音师在不同场合中对于不同的扩声对象按所要达到的扩声效果应采取的调控方法。     

NOPD技术在板结构声辐射控制中的实验研究

本文应用NOPD技术设计了一种复合多层板，按照四边固定薄板结构的模态振型，对不同的NOPD填充形式，进行声学实验，来评价不同填充形式在降低板类结构声辐射方面的效果，分析了该类板结构声振耦合的关系并验证了NOPD技术对声辐射控制的作用。     

Modelling aerodynamic sound in the airways of a human body: A possible diagnostic tool

The sound generated aerodynamically by a pillow-like body simulating an obstacle in the human airway is observed through a soft wall from outside the duct. It is intended to provide a physical basis for an attempted medical diagnostic technique for detecting an obstacle by observing the sound during breathing. So far at least two kinds of sound have been identified: One is sound of the half-jet flow formed downstream of the obstacle, and the other is sound due to unsteady motion of the separation point on the curved surface of the obstacle. For simulating the flow condition downstream of the vocal cords during inhalation, cases with an obstacle at various positions relative to a jet flow are also examined. In this case, the sound due to the downstream obstacle exhibits a complicated dependence on the geometry and flow parameters. Nevertheless, increase in the sound, or more correctly, deformation in the sound power spectrum, due to the presence of an obstacle is detectable from outside, opening up possibilities of its use as a diagnostic aid. Dedicated to the late Professor Itiro Tani on the occasion of 5ACFM, Taejon, Korea     

应用音平化渣图象分析和指导转炉造渣操作

利用音平化渣图象可以清晰地看出在转炉造渣过程中何时发生喷溅，何时发生炉渣返干和何时化渣正常。应用音平化渣图象和炉渣三元相图，可以正确地分析发生喷溅和返干的原因，从而找到避免突发性喷溅和严重返干的方法。正确的枪位和炉渣碱度控制是实现平稳吹炼的保证，而音平化渣图象能帮助操作工实现这一目标。     

Nonconscious control mimics a purposeful strategy: Strength of Stroop-like interference is automatically modulated by proportion of compatible trials.

The magnitude of the Stroop effect is known to be modulated by the proportion of trials on which the irrelevant word and relevant ink color correspond. This has often been attributed to a conscious strategy of increased (or decreased) reliance on the irrelevant words when these are more likely (or less likely) to correspond to the ink colors. However, the present data from a Stroop-like task involving successively presented arrows indicate instead that this type of modulation can be automatic because it can occur even if the irrelevant stimuli are not phenomenally visible. In this case participants cannot determine the proportion of compatible trials to direct their strategy. An automatic, item-specific associative interpretation can account for these findings. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

无线随钻测量技术的应用现状与发展趋势

目前,无线随钻测量技术是石油工程技术发展的一个主要方向。详细介绍了无线随钻测量仪器的传输方式、国内外无线随钻测量技术的主要进展和应用现状,指出了国内外无线随钻测量仪器的优缺点和应用范围,分析了无线随钻测量技术的发展趋势,并提出我国应在借鉴国外先进的无线随钻测量技术的基础上,研制具有自主知识产权的无线随钻测量仪器,以加快我国无线随钻测量技术的发展,缩短与国际先进水平的差距。     

基于非锐化掩模的实时自适应图像增强算法

针对传统的非锐化掩模算法的局限性,依据图像中各像素点及以其为中心的若干相邻像素点的均方差值,提出了自适应图像增强算法的原理,并分析其硬件实现方法,然后给出了该算法与其它算法应用于图像增强的对比结果,最后在FPGA（field programmable gate array）实验板上进行验证.实验结果表明,此算法有效的增强图像的细节区域,防止图像边缘区域出现过冲现象,抑制图像平坦区域的噪声放大.因此,该算法取得了良好的视觉效果,硬件实现简单,适合于实时条件下图像的增强.     

基于计算机声卡的虚拟仪器的设计

主要介绍通过计算机的声卡来实现对虚拟仪器的设计，模拟了示波器、信号发生器和频率计等设备的基本功能，详细介绍了系统的硬件设计方法及软件流程。该系统主要适用于音频范围的各种信号的采集与产生。