Enhanced Auditory Displays for Discriminating Landmines from Clutter Using Electromagnetic Induction Sensors

Landmine detection is primarily performed using electromagnetic induction (EMI) sensors. These sensors detect the presence of metal and convey the information to the sensor operators via an audio signal. Reduction of false alarms from objects that contain metal but are not landmines, i.e. discrimination, is a challenging problem. Recent work on automated algorithms has shown promise towards reducing false alarm rates of EMI sensors. In this study, the audio signal was modified to encode the presence of metal as well as information regarding mine/non-mine belief in order to determine whether the additional information enabled operators to better discriminate mines from clutter. Using data collected from real landmines, we experimentally investigated which perceptual dimensions most effectively convey different aspects of the information contained in the sensor response to a listener. Results indicated that the presence of metal (detection) could be coded in the fundamental frequency of the audio signal, and that mine/non-mine belief (discrimination), determined using an automated algorithm, could be coded in a separate audio dimension. Operators performed better with this audio coding scheme than one where only metal content information was presented via the fundamental frequency of the audio signal.     

多目标航迹显示数据的动态实时压缩处理

针对多目标航迹显示的特殊性,提出了一种动态实时数据压缩处理方法。该方法实时性好,节省内存,目标航迹显示恢复简捷不失真。     

Engineered Biomolecular Recognition of RDX by Using a Thermostable Alcohol Dehydrogenase as a Protein Scaffold

There are many biotechnology applications that would benefit from simple, stable proteins with engineered biomolecular recognition. Here, we explored the hypothesis that a thermostable alcohol dehydrogenase (AdhD from Pyrococcus furiosus) could be engineered to bind a small molecule instead of a cofactor or molecules involved in the catalytic transition state. We chose the explosive molecule 1,3,5‐trinitro‐1,3,5‐triazine (royal demolition explosive, RDX) as a proof‐of‐concept. Its low solubility in water was exploited for immobilization for biopanning by using ribosome display. Docking simulations were used to identify two potential binding sites in AdhD, and a randomized library focused on tyrosine or serine mutations was used to determine that RDX was binding in the substrate binding pocket of the enzyme. A fully randomized binding pocket library was selected, and affinity maturation by error‐prone PCR led to the identification of a mutant (EP‐16) that gained the ability to bind RDX with an affinity of (73±11) μm . These results underscore the way in which thermostable enzymes can be useful scaffolds for expanding the biomolecular recognition toolbox.     

中国微米纳米 面向全息视频显示的深亚波长光栅耦合结构

本文研究了一种类MIM (metal-insulator-metal) 结构,用于全息显示装置,它的关键部分是铝亚波长光栅,该结构可以在可见光范围内调制反射光相位。众所周知,商业化的LCOS是广泛使用的空间光调制器,但是它通过液晶的光程差实现相位调制的机制不利于器件的进一步缩小以达到全息显示所需要的空间带宽。用亚波长光栅结构代替LCOS顶部电极层,虽然几何相似但是物理过程新颖的全息显示装置。当入射光进入金属光栅狭缝,一个典型的零阶衍射和深亚波长F-P共振被诱导。腔边缘的反射相位可以被有效的操纵通过由一个薄的中间电介质层构成的MIM结构,因为金属表面等离子激元对周围介质的变化很敏感。而且,为了适应未来视频全息显示的需求,我们研究了动态实时调制的可能性通过改变电介质层的介电常量。通常铝不被认为是有吸引力的等离子体材料,但是它资源丰富、便宜而且与CMOS兼容,它被广泛使用在空间光调制器中,例如LCOS。同时,众所周知铝等离子体特性对材料的几何形状很敏感。然而,我们的亚波长光栅耦合结构有效的克服上述这些问题,模拟结果已经证明当铝光栅中铝纳米棒从140nm变化到190nm时,相位调制量的影响很小,甚至可以被忽略,这对于实际制备提供了鲁棒的可能性,同时研究了不同光栅高度对实验结果的影响,仿真结果通过CST软件给出,证明仿真电介质媒介参数在液晶折射率变化率范围内可以达到0到2π相位调制在可见光范围,这为真实器件奠定了基础。     

大尺寸机载智能多功能显示器的设计与实现

分析了座舱显示系统发展现状和面临的问题,设计并实现了一种一体化、大屏幕显示的智能化多功能显示器。该型显示器通过FC-AE-ASM（Fibre Channel-Avionics Environment-Anonymous Subscriber Message）网络和高速串行总线高效传输图形数据,解决了图形处理及传输的瓶颈问题;采用ARINC661（座舱显示系统与用户系统的接口）标准,规范了任务处理和显示处理的接口设计标准;支持红外触控以提高人机信息的交互效率;采用工程优化设计以提高显示器抗恶劣环境的能力。应用表明智能多功能显示器运行可靠,相对于传统飞行显示器,在显示处理、数据传输和人机功效等方面具有显著优势。     

国产袖珍DT-8888型4(1/2)位多功能数字万用表的工作原理与设计

本文介绍了国产袖珍式DT-8888型4(1/2)位多功能数字万用表的主要功能与技术指标,并结合主体电路工作原理的分析,讨论了具体电路的设计。     

一种视频字符显示的新方法

介绍一种利用TMS320C25数字信号处理器串行口,以10MHz速率产生视频字符点阵信号,并在视频监视器上显示的新方法,它通过简单的硬件电路和灵活的软件设计,将系统的工作状态,测量数据和时间码以字符的形式直观地与视频信号叠加在一起,并显示出来,而不占用太多的系统资源.     

过程控制系统的实时显示

通过对显示卡编程、画面分割、生成驻留字库等技术的运用,本文给出了过程控制系统实时显示的一种有效方法。     

C8051F020单片机与DMF50081液晶显示器的接口技术

在介绍单片机C8051F020及DMF50081液晶显示器(包括控制器SED1335)的性能特点基础上，探讨了控制器SED1335与C8051F020的接口技术方法，并给出了具体的程序实现。     

基于Qt的显控系统图形显示的研究

作为显控系统不可或缺的功能之一,在图形显示的过程中,如何保证嵌入式系统能够在所拥有硬件资源相对有限的前提下,频繁切换的画面仍旧能够具有相应的稳定性,是相关人员主要研究的课题之一.本文则以此为核心内容,对Qt显示、绘图的机制以及导致画面出现闪烁问题的原因进行了系统、深入的分析,并提出了具有针对性的解决策略,希望能够在某些方面为Qt显控系统所显示图形质量的提高提供一定的帮助.