基于ELM的硫熏强度软测量模型

硫熏强度是亚法糖厂澄清工段的关键工艺参数之一;硫熏强度过低会影响澄清效果,过高会造成成品糖二氧化硫残留过高;目前由于缺乏合适的硫熏强度在线测量装置,该参数主要采用人工取样和离线化验的检测方式,化验滞后时间较长,难以根据该指标及时指导实际生产的问题;为此文章采用极限学习机(ELLM)方法建立了硫熏强度软测量模型,并与基于支持向量机(SVM)、径向基函数(RBF)神经网络和反向传播(BP)神经网络的硫熏强度软测量模型进行对比分析;结果显示,基于ELM的硫熏强度软测量模型具有训练收敛速度快、模型精度高和泛化性能好等优点,可以满足实际糖厂澄清工段的要求.     

Development of a robot assisted carotid blood flow measurement system

The ultrasound diagnosis of the carotid artery is one of the most common non-invasive methods to detect early stage heart and cerebrovascular diseases. However, the precision and repetitiveness of the probe positioning depend exclusively on the operator's skills and dexterity. For this purpose, we propose the development of a robot assisted system to enhance the accuracy and repetitiveness of the probe positioning to measure the wave intensity (WI) index. In this paper, the Waseda-Tokyo Women's Medical-Aloka Blood Flow Measurement Robot System No. 2 Refined (WTA-2R) is presented. The WTA-2R consists of a conventional ultrasound diagnosis system, a 6-DOFs parallel link slave manipulator, a 6-DOFs serial link passive arm, and a master device. Experiments were carried out to verify its effectiveness in terms of accuracy and required time to perform the task. From the experimental results, the positioning accuracy and reduction of required time were confirmed.     

Cellular analysis by open-source software for affordable cytometry

Image cytometry is an important technique in affordable healthcare and cellular research. Some efforts toward establishing a personal, low-cost cytometer have been described in the literature. However, a self-assembled fluorescence microscope requires software for cytometric analysis. There are some open-source image-based software analysis applications available. However, for a quantitative analysis of images, software that can generate data comparable to those of previously evaluated cytometric analyses programs is required. Hence, the aim of this study is to compare results of a commercially available image cytometry program to data obtained using the open-source software CellProfiler (CP). Leukocytes and fluorescent bead images obtained using a Laser Scanning Cytometer were analyzed by CP and the results compared with those of conventional cytometric analyses' programs. Algorithms were developed enabling the analysis of leukocytes and beads by CP. CP provided similar results to those obtained by the cytometer software. Hallmark parameters, including cell count and fluorescence intensity, revealed a high correlation in the analysis of both programs. Therefore, CP is appropriate for cellular analysis on a self-assembled microscope, thereby enabling affordable cytometry.     

金安桥水电站大坝抗震分析和抗震措施设计

金安桥水电站大坝地震设防烈度高达9度,基岩场地设计水平动峰值加速度为0.399 g,大坝抗震分析和抗震措施设计是工程关键性技术问题之一。采用数值计算法和模型试验法对碾压混凝土大坝进行了全面的动力分析,确定了大坝的抗震薄弱部位,为金安桥水电站大坝设计提供了保证。     

不同暴雨等级下崇明岛除涝能力评估

为支持崇明生态岛建设,在现状崇明岛水利控制工程的基础上,研究选取不同等级暴雨雨型和不同特征潮型的组合对崇明岛除涝排水能力进行计算,对预降能力、暴雨期间最高水位以及暴雨后排水时间等参数进行分析,并根据研究结果提出不同等级暴雨预报情况下调整水闸引排模式、预降水位的建议。     

闸下海漫柔性加糙体消能防冲机理试验

通过室内水工模型试验,量测了采用废旧轮胎加糙后三维流速的分布。结果表明:加糙后近底流速明显降低,但整个断面的平均流速近似相等;随着轮胎排数的增加,水流紊流强度平均值增大,附加切应力增大,流体质点间相互混掺的情况加剧,从而使消能效率得以提高。     

基于调制度信息的网格重构算法

提出一种基于调制度的网格重构算法,首先对调制度进行等级量化,在调制度高的区域构造种子三角面片;然后优先选取测点调制度高的活动边进行增长,依据加权最小长度准则选择最佳候选点;在径向基函数孔洞修补之前根据三角面片几何属性对孔洞边界进行预处理.实验结果表明,该算法对平坦和高曲率区域都能有效地重构出形态比较均匀的二维流形网格,较好地保持了模型的细节尖锐特征.     

基于光纤传感器的转速测量系统设计

本文提出一种基于光纤传感器测量旋转轴转速的方法,入射光线经旋转轴反射面反射后,利用反射式光纤传感器采集得到强弱变化的反射光,采用频率测量法得到反射频率,通过信号处理电路进行转换,即可测量转速.该系统具有电路结构简单、精度高、抗干扰能力强、光路弯曲、测量方便等优点.     

基于相机的多投影光度补偿系统

现有关于光度补偿的研究主要基于单投影,可在带有纹理和颜色的表面上进行投影显示。而在多投影系统中,由于多投影带来了重叠区域的光度不一致性,相机的每个像素覆盖的区域增大等问题,容易致使光度补偿失败。介绍一种基于相机的多投影光度补偿系统,虽然也是通过获取环境参数的手段,但提出一种方便快捷的迭代方式来提高投影表面反射率参数的获取精度,可以达到更好的效果,并仅需对投影区域捕捉两幅以上图像。同时,对多投影仪重叠区域的融合效果也做了改进,统一解决了光度补偿和投影拼接问题。最后,提供的实验结果表明有较好的改进效果。     

可调谐激光二极管吸收光谱残余光强调制补偿技术研究

分析了可调谐激光二极管吸收光谱仪器中残余光强幅度调制对谐波探测和全数字化信号处理的影响;搭建了基于电压可调谐光强衰减器(MEMS VOA)的光强残余幅度调制的补偿实验系统平台;实验结果表明,本补偿装置可以把残余光强调制降低到补偿前的1/20,并将其带来的二次谐波线型畸变降低60 %以上;初步证实了利用本方法消除二次谐波畸变并实现全数字化处理的可行性.