PLC控制的粕库装车打包计数系统设计

设计了一套粕库装车打包计数系统,装车机和打包秤通过打包计数信息化系统保证了豆粕发货数量准确,该系统可实现手机APP与电脑同步控制,计算机自动统计操作日志,事件追溯等功能。该系统使用光电传感器作为检测元件,实现对打包数量的自动计数。本文对该系统的硬件电路、软件控制流程以及现场实物设计作了详细介绍并进行了样机验证。结果表明,该系统能对包数进行快速、准确地计数,同时LED屏幕上显示的剩余包数自动递减。     

计数式辐射成像及其在预应力梁检测中的应用

介绍一种计数式辐射扫描成像系统。这种计数式辐射成像系统除量子噪声外．不受电子学噪声影响,可以降低测量剂量和增大系统本身的动态范围。比较适于检测预应力梁等厚密物体。用蒙卡模拟对系统的对比度进行了分析．并设计了一种高集成度的计数式辐射成像系统的数据获取和传输电路。     

纸张厚度自动测量系统设计与实现

纸张厚度自动测量系统以STC15F2K61S2单片机为主控器,由NE555芯片与平行金属板构成的多谐振荡电路、信号采集电路、控制电路、存储电路、报警电路、按键控制电路、Nokia5110液晶显示等电路组成。通过对振荡电路将被测电容值的变化转化为频率值的变化关系进行分析,再通过对单片机不同频率信号进行分析处理,运用多种算法精确测出纸张的实际频率,从而根据不同频率值计算出与纸张的数量对应关系。测试系统具有频率采集、处理、计数显示和自校准功能,并将校准数据参数存储于AT24C02中。通过WiFi无线通信电路、专用手机APP程序,可实现测试的纸张张数在移动终端实时显示。该系统识别迅速、准确、适应性强,能够满足纸张厚度测试实验设计要求,为纸张测量设备智能制造提供参考。     

持率流动成像仪应用研究

简述了油气井内流体多相流动成像测井技术的发展现状,讨论了斯伦贝谢公司研制的持率流动成像仪的测试方法以及数据处理方法和影响因素;与其他测井方法测试结果对比表明,该仪器的应用效果良好。     

一种新型干涉仪计数电路

介绍了一种新型的干涉仪计数电路.由于采用了EPROM编码技术实现细分辨向,以8253作为计数器件,用单片机89C51完成辨符号及其它测量功能,系统结构大为简化,并具有较强的抗干扰性能及较高的智能化程度.     

Using Stack Overflow content to assist in code review

An essential goal for programmers is to minimize the cost of identifying and correcting defects in source code. Code review is commonly used for identifying programming defects. However, manual code review has some shortcomings: (1) it is time-consuming and (2) outcomes are subjective and depend on the skills of reviewers. An automated approach for assisting in code reviews is thus highly desirable. We present a tool for assisting in code review and results from our experiments evaluating the tool in different scenarios. The tool leveraged content available from professional programmer support forums (eg, StackOverflow.com) to determine potential defectiveness of a given piece of source code. The defectiveness is expressed on the scale of {Likely defective, neutral, unlikely to be defective}. The basic idea employed in the tool is (1) to identify a set P of discussion posts on Stack Overflow such that each p∈P contains source code fragment(s), which sufficiently resemble the input code C being reviewed, and (2) to determine the likelihood of C being defective by considering all p∈P. A novel aspect of our approach is to use document fingerprinting for comparing two pieces of source code. Our choice of document fingerprinting technique is inspired by source code plagiarism detection tools where it has proven to be very successful. In the experiments that we performed to verify the effectiveness of our approach, source code samples from more than 300 GitHub open-source repositories were taken as input. An F1 score of 0.94 has been achieved in identifying correct/relevant results.     

基于双路图像采集的变压器油杂质颗粒计数器研究

为提高变压器油杂质颗粒检测的准确度、改善杂质颗粒形状不规则及重叠等对测量结果的影响，在对传统油液颗粒计数器分析的基础上，提出了基于双路图像采集的变压器油杂质颗粒计数方法，利用双镜头结构从相互垂直的两个角度获取颗粒的粒度粒形信息，消除了颗粒重叠对测量结果的影响，并对标准聚苯乙烯颗粒制作的混合粒径样品进行了实测。试验结果表明，基于双路图像采集的液体颗粒计数器能够使计数准确度提高2.1%。     

用于核保障中核材料衡算的液体闪烁体中子多重性测量装置

本工作优化设计建立了1套可用于核保障中核材料衡算的液体闪烁体中子多重性测量装置，并基于该装置开展了性能测试。结果表明，装置运行状态稳定，各项指标均在可接受范围内。同时开展了对²⁵²Cf源和标准Pu样品的实验室模拟测量等中子多重性测量研究。结果表明，该测量装置的探测效率好于15%，测量相对标准偏差为8.6%，表明在条件允许时，通过长时间信号采集，该中子多重性测量装置有能力替代基于³He管的中子多重性测量装置，通过中子多重性分析完成核保障中核材料衡算定量测量任务。     

Task distribution algorithm based on community in mobile crowd sensing

A community-based task distribution algorithm was proposed to solve the problem of the validity of mobile crowd sensing (MCS) task distribution.By calculating the minimum spanning tree (MST),the connection parameter (CP) and the community convergence degree (CI) between the mobile nodes,the behavior patterns of the users were abstracted and identified to rationally divide the nodes into different communities.Then,the eigenvalue matching degree of the community behavior patterns with the sensing task was calculated.According to the matching degree,the distribution of the corresponding tasks was completed by the central node of the community.The simulation results show that the proposed method can effectively improve the accuracy of the task distribution and the task completion rate,and save the time cost of the task completion.     

基于弱光栅阵列应变传感的驼峰溜放监测方法研究

针对现有驼峰溜放监测技术易受电磁干扰和外界环境影响,且很难实现大容量、高密集测量的不足,提出一种基于弱光栅阵列应变传感的驼峰溜放监测方法。首先,采用反射率仅为0.2‰的弱光栅阵列及混合复用组网技术解决了大容量、高密集检测的难题；其次,结合有限元模型和轮轨耦合理论对轨道受力情况、传感器灵敏度进行推导分析；最后,将封装好的光栅阵列传感光纤安装在试验现场,并进行了压道实验。结果表明,该方法能够准确识别溜放车组的轮轴信息、行车方向以及轨道占用信息。系统可靠性高、灵敏度较高,为轨道占用检查技术提供了新的思路。