Comparison and Selection of Arch-Rib Construction Schemes for Continuous Beam arch Composite Bridge of High Speed Railway

The paper summarizes the four different construction schemes based on engineering cases for the arch rib construction of continuous beam-arch composite bridges for high-speed railways.These methods include in-situ assembly,segmental lifting,incremental launching and longitudinal moving,and vertical rotation.The temporary structural designs,process methods,and technological equipment for each construction scheme are described in detail.The advantages and disadvantages of each scheme and its application scope under various conditions are analyzed,and opinions and suggestions for guiding the application of each scheme are proposed.The comparison and selection analyses show that the four arch rib construction schemes have certain applicability under different conditions such as bridge site status,bridge span,and construction environment.With the continuous increase of bridge span and progress of construction technological equipment,the arch rib construction technology is developing towards the overall erection direction.This leads to more obvious technical advantages of the segmental lifting method,incremental launching and longitudinal moving method,and vertical rotation method.Therefore,it is necessary to select the best construction scheme according to the construction status and technical conditions during application.

State-of-Art Satellite Launch Date Set for 1991

China’s new generation of communications satellites Will be ready for launch early next year.The Dongfanghong III satellite is in the final stage of assembly and testing.The new satellite,weighing 2.22 tons andwith a setvice life of eight years,will replace three experimental Chinese communications satellites already in orbit.It will provide more channels for television programmes and telecommunications sevices than those three puttogether.New technology will be used in the manufacturing of the satellite.The use of tri-axial stabili/ationtechnology,not commonly applied in satellite manufacturing.will make it possible for the satellite’s wingshaped solar array and antenna to deploy as soon as it is separated from its launch carrier.This requires advancedand accurate driving and controlling systems.The Chinese Academy of Space Technology has co operated

Lacoste Launches Its First Operation to Safeguard Endangered Crocodile Species

In 1927, when René Lacoste chose the crocodile as his emblem, he had not imagined that 80 years later, millions of people would bear this logo. He could also not imagine that the crocodile would be

Underwater Explosion Technology for Offshore Engineering Applications

- This article briefs how to improve the holding power of a drilling vessel's anchor and to remove those unreasonable structures by such a technology - underwater-explosion technology. The article gives details of the structure, characteristics and applications of a rocket-launched anchor; as well as the principle, properties, applications of directional explosion cutting.

Development of China's Application Satellites

The development of China’s space technology has been the focus of the world attention. Since the successful launch of DFH-1 artificial earth satellite on April 24, 1970, China has sent 33 indigenous satellites, including scientific experimental satellites, technical experimental satellites and meteorological satellites. All the experimental and operational satellites have played an important role in the construction of national economy and defense, and provided the advanced prapagation instruments for China’s science, culture and education, and people both in cities and countries could watch TV andlisten to the radio and take part in telelecture. This has improved the cultural quality of the whole nation and accelerated the development of the four modernizations.

First Satellite in FY-3 Batch 03 Expected to Launch in 2018

The operational requirement of batch 03 of FY-3 meteorological satellites passed the expert review organized by China Meteorological Administration(CMA).The first satellite is scheduled to launch in 2018.China’s first rainfall measurement satellite is among the batch.Chief Commander and Chief Designer of FY-3 satellite GAO Huoshan announced,"In six years,FY-3batch 03 will achieve 4-satellite networking observa-

Assessment and Analysis of Carrying Capacity of 350 km/h EMUs Operating on Beijing-Shanghai Highspeed Railway

This paper makes an analysis of the impact on the structure of the corridortype train working diagram by increasing the 350 km/h train pairs of Beijing-Shanghai High-speed Railway(HSR).According to the requirements of operation speed diversity,the multi-station receiving characteristics of cross-line trains and different train stopping schemes,this paper proposes a scheme of adding 350 km/h train pairs via computer analysis of carrying capability mode.The scheme is divided into three stages:(1)Initial stage:It is planned to increase trains running at 350 km/h,with 15~26 pairs of trains put into operation;(2)Rapid increase stage:27~142 pairs of 350 km/h trains are put into operation;(3)Full replacement stage:143~195 pairs of 350 km/h trains are put into operation,during which the number of cross-line trains under operation is controlled,the number of cross-line trains in each section is determined,the operation and connection scheme of cross-line trains is adjusted and the train stopping scheme is optimized.The results of this study were used for the adjustment of the train working diagram in the third quarter of June 25,2021 to increase the number of 350 km/h train pairs from 19 to 30 on Beijing-Shanghai HSR.350 km/h trains are evenly arranged during 7:00—19:00 on the train working diagram and 300 km/h trains are arranged by making full use of every time and space,to improve the travelling speed on Beijing-Shanghai HSR as a whole.

面向易行的高速铁路智能平行调度系统构架及关键技术

针对我国高铁成网运行、管控列车数量和种类多、运营方式复杂等特点,以构建新一代智能动态调度系统为目标,探讨面向易行的高速铁路智能平行调度系统构架,从5个方面提炼出高速铁路智能平行调度系统的技术特征。总结目前高速铁路智能平行调度系统研究亟待解决的关键技术,介绍智能高铁平行调度一体化仿真原型系统研制及实现的部分场景功能。研究工作可为建立面向易行服务的,适应中国高铁“效率变革”“质量变革”需求的智能动态调度理论与技术体系,实现我国高速铁路智能调度系统和运输服务水平的升级发展提供参考。

高速铁路智能运营业务提升需求与实现关键技术

高速铁路智能运营是现代技术在高速铁路领域的综合运用,是高速铁路发展的必然方向。在对高速铁路旅客出行、运输组织、设备运维、运营管理4方面业务进行梳理分析的基础上,总结出高铁智能运营发展目标,并从旅客出行、运输组织、设备运维、运营管理出发,提出涵盖智能票务、智能服务、智能车站、智能监测、智能运维等的高铁智能运营业务提升需求体系。以“模数一体,轴面协同”为核心理念,提出包括人工智能、大数据处理、虚拟现实与增强、信息物理系统、云/雾/边缘计算以及数字孪生等在内的智能高铁运营实现关键技术,可为未来智能高铁的规划、实施及落地应用提供依据。

高铁智能驾驶技术及应用

自动驾驶具备提高运输效率、提升乘客舒适度、减轻司机劳动强度以及降低列车牵引能耗等优势,是高速铁路智能化发展方向。根据我国高铁自动驾驶CTCS-2+ATO/CTCS-3+ATO发展现状,从技术体系、系统架构、运行控制等方面分析了当前技术。结合功能试验和性能试验对京张高铁ATO功能优化及运用情况进行研究,为ATO系统推广应用和技术持续提升提供了有力支撑。在此基础上,针对高速列车自动驾驶智能化提升需求,从正线GoA3自动驾驶、动车所自动化调车、调度控制一体化等方面提出了智能化改进方案,以支撑智能高铁2.0体系建设。

大数据背景下广播电台发射设备的运维策略研究

随着技术的快速发展,大数据在广播电台发射设备的运维管理中扮演着越来越重要的角色。系统分析广播发射系统的现状和传统运维模式的局限性,深入探讨大数据技术的定义、特征及其在运维管理中的应用。详细阐述基于大数据的智能化运维策略,包括智能巡检计划的制定与执行、设备健康度预测及预测性维护。通过分析大数据技术在广播电台发射设备运维中所面临的挑战,提出相应的解决对策,并展望其应用前景。基于结合大数据技术的运维新模式,可提高广播电台发射设备的运维效率和准确性,确保广播服务的连续性和稳定性。

特种设备作业人员证书电子化的探讨

为了进一步加强特种设备监管,便企利民,提高办事效率,提升服务水平,实地走访调研特种设备作业人员证书相关机构和人员,了解了特种设备作业人员证书的现状,深入分析相关方所面临的问题,梳理了全国各地特种设备作业人员证书电子化的改革试点工作情况,分析了试点成效和存在的问题,在此基础之上对特种设备作业人员证书电子化工作提出合理化建议。

庐山站超大体量高架站房上跨营业线钢结构整体顶推关键技术

针对天桥、连廊和高架站房组成的异形不等高钢结构体系整体跨铁路营业线施工难题,建立该结构体系的数值分析模型,对其顶推全过程进行模拟仿真分析,通过结构物关键部位的风洞试验,考虑极端温差、强风以及极端温差和强风耦合作用下,分析异形不等高结构体系整体跨营业线施工过程受力与变形情况。相应提出的施工方法能够满足异形不等高钢结构体系整体跨铁路营业线施工安全性要求。通过构建异形不等高钢结构体系整体跨越营业线施工风险监测预警系统,实现结构体系跨越营业线施工风险的定量评估和智能化预警。

China Launches Remote Sensing Satellite For Venezuela

China launched a Venezuelan remote sensing satellite,VRSS-2,into a preset orbit from the Jiuquan Satellite Launch Center at 12：13 Beijing time on October 9.The satellite was launched by a LM-2D carrier rocket which was developed by the Shanghai Academy of Spaceflight Technology.

重型火箭无人值守箭地气液连接技术研究

火箭的箭地气液连接方式对于火箭发射无人值守程度有重要的影响,并关系到火箭发射的可靠性和安全性。通过对重型火箭的气液连接技术的调研分析,结合中国的重型火箭特点、三垂测发模式以及射前流程,总结了重型火箭对无人值守箭地气液连接系统的设计需求。按照集中化、组合化和自动化的原则,对中国重型火箭箭地气液接口的总体方案进行了技术分析,结合中国气液连接器自动对接和零秒脱落两类技术的研究现状,提出了满足中国重型火箭无人值守需求的箭地气液连接方案。

China's Long March Launch Vehicle Family

This paper is intended to have an introduction on research and development of China’s Long March launch vehicle family, with an emphasis on the development of nine launch vehicles; the LM-1, LM-2, LM-2C, FB-1, LM-3, LM-4, LM-2E and LM-1D, LM-3A under development.

China Will Launch 14 Meteosats over the Next Ten Years

It was announced at the Symposium for FY Satellite Development that by2025,China will launch 14 more meteorological satellites,developed by CASC,into orbit.The 14 satellites include one FY-2 satellite,four FY-3 satellites,three FY-4 satellites,two precipitation measurement radar satellites,one earlymorning-orbit satellite,one geostationary atmospheric microwave sounding satellite,

A LM-4C Launches the GF-3 Satellite

The GF-3 satellite was successfully launched at 06：55 Beijing time on August10 using a LM-4C launch vehicle from the Taiyuan Satellite Launch Center.The launch was the 233rd flight of a LM family launch vehicle and the carrier rocket LM-4C was developed by the Shanghai Academy of Spaceflight Technology.

考虑天窗利用率的综合维修作业车提前上线与运行线铺画方法研究

综合维修天窗是列车运行图中预留专门供工务、电务、供电等部门综合协调维修铁路基础设备设施的时间,有效利用综合维修天窗开展维修作业有利于保障铁路基础设备设施质量与行车安全。为了提高综合维修天窗利用率,通过分析既有维修作业内容,利用维修作业车有效作业时间近似计算综合维修天窗利用率,得出天窗利用率主要受天窗时长、辅助作业时间与维修作业车作业效率的影响,然后提出了可以缩短天窗修辅助作业时间的综合维修作业车提前上线方法以及精细化维修作业组织过程的维修作业车运行线铺画方法,最后通过案例分析得出:在采用维修作业车提前上线方法后,4个维修工区的天窗内上下行平均辅助作业时间分别缩短27.5 min与34.5 min,上下行天窗利用率分别提高11.5%与14.4%。

运载火箭飞行控制软件的多任务设计方法

为适应新一代运载火箭电气设备数字化、智能化的发展,提出了基于嵌入式实时操作系统的飞行控制软件多任务设计方法。设计了飞行控制、数据管理、精确关机等任务,根据实时性要求设置了相应任务的优先级;设计了飞行控制任务在三冗余处理器中一致性运算的机制;提出了控制周期内多任务共用临界资源的约束性要求作为冗余同步运行的余量指标。本文设计的多任务已在新一代中型运载火箭飞行试验中得到验证。