全国人大代表何少花:肩负使命参会 满载收获归来

<正>“作为一名普通的、来自一线的公交驾驶员,能够当选全国人大代表,我感到十分光荣,新的身份也让我有了更多的责任和义务。”近日,一场生动的宣讲在北京公交集团电车分公司展开,宣讲者正是北京公交集团电车客运分公司第十七车队快速公交2线(BRT2)的驾驶员何少花。     

Error Analysis of Liquid Holdup Measurement in Gas-Liquid Annular Flow Through Circular Pipes Using High-Speed Camera Method

Accurate measurement of gas-liquid phase fraction is essential for the proper modelling of the pressure drop, heat transfer coefficient, mass transfer rate and interfacial area in two-phase flows. In this paper, taking the issue of optical distortion into account, an analytical model was proposed to estimate and correct the liquid holdup in gas-liquid annular flow through a circular pipe using high-speed camera method. The error in the liquid holdup measurement generated from different refractive indices among transparent circular pipe, liquid film and air core was firstly theoretically analyzed based on the geometric optics. Experimental tests were then carried out to identify the difference as well as to validate the proposed model. Results indicated that the prediction of the liquid holdup has a good performance with the experimental data (i.e., mean relative error is 4.1%) and the measured liquid holdup is larger than the real one. It was found that the measured liquid holdup is larger than the real one. Generally, when the real liquid holdup gets smaller, the discrepancy between the measured liquid holdup by image and the real liquid holdup becomes more significant. Thus, after measuring the liquid holdup from the images, the value of the measured liquid holdup must be corrected by the present model in order to obtain the real liquid holdup.     

武汉城市圈城际铁路运营及经营管理研究

城际铁路的建设给武汉城市圈的旅客出行提供了快捷、便利的交通方式.按照客流规律,制定列车开行方案;依据经济社会的实际情况,确定合理的票价;扩大主营业务,依托铁路资源发展多元经营.城际铁路的运营为实施城镇化发展战略创造有利条件,城镇化战略的实施为城际铁路带来持续增长的客流,从而实现地方与铁路共赢.     

采用改进的修正双曲线法预测高速铁路路基沉降

高速铁路路基工后沉降的预测十分关键.沉降监测过程中观测时间间隔不等,将导致修正双曲线法进行数据拟合时存在一定的偏差.本文提出了一种加权的修正双曲线法,建立考虑观测时间间隔的权值目标函数,权值大小与时间间隔成正比,利用VBA功能实现矩阵的迭代求解,获得拟合曲线的参数,并对两种方法拟合的结果进行了对比.结果表明,采用改进方法预测的工后沉降更接近于实测数据,提高了沉降预测精度,验证了改进方法的合理性.     

高真空强排水联合低能量强夯动力固结法在吹填土地基加固中的应用

结合厦门市环东海域综合整治建设项目丙洲区C标段吹填区软弱地基加固工程,对高真空强排水联合低能量强夯动力固结法加固吹填土软弱地基的施工技术进行了介绍,并经过标准贯入试验(SPT)、静力触探试验(CPT)以及荷载板试验(PLT)检测,其结果均满足设计的要求。同时,对加固效果进行的相关探讨,其部分结论为以后类似地基处理提供一定的参考。     

Detecting Premature Ventricular Contraction in Children with Deep Learning

Premature ventricular contractions (PVCs) are abnormal heart beats that indicate potential heart diseases. Diagnosis of PVCs is made by physicians examining long recordings of electrocardiogram (ECG), which is onerous and time-consuming. In this study, deep learning was applied to develop models that can detect PVCs in children automatically. This computer-aided diagnosis model achieved high accuracy while sustained stable performance. It could save time and repeated efforts for physicians, enabling them to focus on more complicated tasks.This study is a first step toward children’s PVC auto-detection in clinics. Further study will improve the model’s performance with optimized structure and more data in different sources, while facing the challenges of the variety and uncertainty of children’s ECG with heart diseases.     

浅析我国国债发行制度的弊端

国债是连接财政政策和货币政策的桥梁,而我国的国债发行制度存在种种弊端,不利于经济的发展。本文从建国后中国的国债发行历史和现状中找寻国债发行制度存在的弊端,建议从国债的发行额度、发行对象、发行方式、发行时间及发行凭证形式等制度安排上减少风险,减少成本,增加效益,为国债发行制度的完善指明方向。     

公路运输能源消耗现状及其节能降耗对策

2000年以来,我国国民经济的快速发展促进交通运输业也得到稳步发展,公路客、货运输周转量的年均增长率超过了7%,2005年我国全社会完成公路客运量169.74亿人,旅客周转量9292.08亿人公里;完成公路货运量134.18亿吨,货物周转量8693.19亿吨公里。公路客运量、旅客周转量在综合运输体系中所占比重分别为91.9%和53.2%;公路货运量、货物周转量在综合运输体系中所占比重分别为72.3%和10.9%。公路运输大力发展的同时,公路运输的能源消耗也在快速增加,估计2005年全国公路运输营运车辆消耗成品油约5400万吨。根据交通部《道路运输业发展规划纲要(2001-2…     

基于双重差分模型的双积分政策影响异质性研究

本文在梳理国内外汽车产业政策研究和相关理论的基础上,以中国2016-2020年乘用车企业月度产量数据作为研究对象,构建双重差分模型量化评估了双积分办法对国有与合资企业,以及是否具备关联企业关系构建双重差分模型量化评估了双积分政策对国有与合资企业、关联企业产生的异质性影响。结果显示,双积分政策实施会显著提高国有企业、具有资本关联方的企业低油耗汽车的产量,但影响存在滞后性;同时政策的实施会显著提高国有企业新能源汽车的产量。据此提出鼓励汽车节能技术提效升级、优化新能源积分机制等政策建议。