Metastasis of malignant melanoma of the nasal mucosa to the small intestine

Malignant melanoma of the mucous membranes is rare and has a very poor prognosis. When localized in the nose, the tumor becomes apparent late in the course of the disease with nasal obstruction and epistaxis. Distant metastases are uncommon, but any organ of the body can be involved. A case of a malignant melanoma of the nasal mucosa with metastasis to the small intestine is presented, and the natural history of the metastatic disease is discussed.     

A Jordan control canonical form for singular systems

A canonical form for controllable singular systems modulo restricted system equivalence is presented. The canonical form respects the decomposition of the singular system into a regular and an impulsive part. The construction is based on Popov's control canonical form and on the Jordan canonical form recently developed by Hinrichsen and Prätzel-Wolters. Continuity properties are analysed and the cellular partition of the orbit space induced by the canonical form is briefly discussed.     

香豆素-铜离子(Ⅱ)配合物硫醇荧光探针的合成及荧光性质

以8-甲酰基-7-羟基香豆素-3-甲酸乙酯与2-氨基苯酚为原料合成了一种亚氨基香豆素类衍生物,其在与铜离子络合后制成了香豆素-铜离子配合物硫醇荧光探针。该探针在体积分数50%的乙醇水溶液中对含有巯基的氨基酸具有良好的选择性。通过荧光光谱,研究了探针的检测机理。在探针识别过程中荧光强度明显增加,在365 nm紫外光激发下荧光颜色由绿色变为蓝色,可以实现可视化检测。     

基于DSP的红外成像电力在线检测系统的研究

介绍了红外焦平面热成像仪原理,系统采用FPGA对数据进行采集控制,采用DSP对数据进行处理并与PC机通信,在硬件上构成一个以DSP＋FPGA＋PC的成像电力在线检测系统。文章给出了红外成像视频信号和DSP数据处理方法,并使用VB6.0实现图像在PC机上的显示和处理。     

Research and application on three-dimensional seismic and vibration isolation for building

This paper presents the study of a three-dimensional(3D) isolation system.Firstly,the authors investigated the effects of an innovative 3D isolator,which was composed of a connecting plate,a rubber pad for vibration isolation in the vertical direction and a horizontal rubber bearing for seismic isolation in both horizontal directions.Secondly,the authors designed such a vibration isolation system and installed it underneath two specific residential buildings which were built directly over an existing subway communication hub platform in Beijing.These buildings required good performance vibration and seismic isolation system to reduce the impact from the running of nearby subway trains.Finally,in situ tests were conducted for both the isolated and the non-isolated buildings for the purpose of comparison.The test results showed that the maximum acceleration response level of the isolated superstructure is reduced by 10% as compared to that of the platform.The maximum attenuation of vibration reaches up to 25 dB.The 3D system explored in this paper is very effective in control and suppression of building vibration induced by earthquakes or running of trains.     

光纤光栅传感器在结构健康监测中的应用

详细阐述光纤光栅传感器的结构及布拉格光纤光栅传感器的工作原理。重点介绍结构健康监测系统构成、光纤光栅传感器系统的信号处理、安装等方面问题;展望光纤光栅传感器在结构健康监测领域中的前景。     

基于SL811的嵌入式USB主机研究与设计

针对USB主机嵌入式的需求,研究和设计了基于SL811的嵌入式USB主机系统。通过USB主从控制芯片SL811,把一个基于ARM7的嵌入式系统做成一个带USB接口的主机。用C语言编写USB主机驱动程序,通过交叉编译器arm-linux-gcc和arm-elf-tools分别对U-Boot和uCLinux进行移植及编译,从而实现嵌入式USB主机对U盘的读写操作。     

用浮动零点法消除温度对SAW加速度计测量准确度的影响

分析了温度漂移对声表面波谐振器(SAWR)及其声表面波振荡器(SAWO)频率特性、以及对SAW加速度计测量准确性的影响,探讨了提高SAW加速度计测量准确度的方法,提出了一种基于浮动零点原理抑制温度共模干扰的双对SAWR加速度计设计方案.本方案不仅通过设置浮动零点SAWR抑制了SAWO频率-温度漂移对SAW加速度计测量准确度的干扰,还在一定程度上降低了对SAWR表面制造工艺的要求.     

一种高精度超声测距方法的研究

本文介绍了一种基于超声波循环反射测量原理的高精度超声测距方法 ,并给出了以单片机为核心的测距系统的组成 .本测量法克服了多次反射法中对回波脉冲个数的限制 ,经温度补偿后测量精度得到了明显改善 .