控制爆破技术在改善露天矿边坡稳定性的应用

为防止露天矿边坡过爆和减小爆破振动对边坡的破坏,对边坡处炸药单耗、起爆方式、延时等因素,结合爆破反馈的数据进行了分析,提出了对生产爆破、缓冲爆破和预裂爆破各参数具有操作性的建议。     

绿色起爆药2,4,6-三叠氮-1,3,5-三嗪的制备及性能研究

以三聚氰氯和叠氮化钠为原料,在室温条件下搅拌反应,得到流散性好的白色粉末固体2,4,6-三叠氮-1,3,5-三嗪(TAT),结合元素分析、红外光谱、质谱分析,确定了TAT的化学结构。研究了TAT的热稳定性、真空安定性、感度以及起爆能力等性质。结果表明:TAT的热分解温度为190℃,5s延滞期爆发温度为170℃;在60℃下连续40h放气量仅为0.03m L/g,真空安定性好;爆热为4 375 J/g,比容为700.0 m L/g;静电感度明显低于氮化铅(LA)和斯蒂芬酸铅(LTNR)。TAT具有很强起爆能力,5mg TAT能够有效起爆70mg黑索今。     

基于SIP的社区医疗网络系统设计

以实现人人享受医疗为目标,建立社区医疗网络系统,将成为远程医疗发展的新趋势。根据SIP协议的特点设计了一套社区医疗网络系统,可实现对社区居民的远程监护、远程教育,并可进行远程会诊,使得社区中的病人特别是慢性病患者和老年人在家中便可接受医师的指导和治疗。系统已在济南某社区试运行,达到了期望的效果。     

钢筋混凝土双曲拱桥爆破拆除

介绍了采用控制爆破技术成功拆除钢筋混凝土双曲拱桥的典型实例。该桥采用定向倒塌爆破法,根据大桥的特点,合理布置炮孔并计算单孔装药量,搭设钻孔操作平台,采用孔内外延时起爆网路,设计不同的起爆顺序成功实现了桥墩、墩帽、立墙和拱脚、拱顶的依次起爆,同时做好爆破安全防护措施,使爆破飞石及爆破振速得到有效控制,取得了理想的爆破效果。     

压力容器焊缝咬边疲劳裂纹的启裂寿命

针对某企业空气球罐焊缝咬边在压力波动时的受力情况,首先建立带咬边结构的受力模型,利用西田正孝的图表方法和有限元法分别计算咬边引起的弹性应力集中系数,然后计算出咬边尖端的名义应力,进而利用小缺口启裂寿命经验估算式估算咬边的疲劳裂纹启裂寿命。再采用与实物等厚度、与真实咬边等尺寸的模拟试样,进行与实际结构等应力范围条件下的模拟疲劳试验。结果表明,试验寿命与根据经验估算式得到的估算寿命非常接近,从而为咬边疲劳裂纹启裂寿命研究提供了理论依据和试验数据。在考虑一定的安全系数后,对所分析的球罐给出的剩余总寿命为9年,至启裂的剩余寿命为6年。     

光—生物降解PP餐饮具的制备和评价研究

介绍了光-生物降解PP餐饮具的制备,用红外光谱和力学性能衰变的方法评价其生物降解引发过程。光-生物降解作用的研究结果表明,PDPⅢ和Ⅳ降解母料添加剂是此类餐饮具生物降解引发过程的有效引发剂,而此类餐饮具具有初始力学性能优良,环境降解作用显著（羰基指数值提高达中国国家标准）,价格低廉和符合食品卫生要求等较优的综合使用性能。     

WiMAX下的列调强拆SIP扩展方案

会话初始化协议(SIP)作为VoIP的主流会话控制协议,基本功能相对简单,不能满足无线列调核心业务的强拆需求。针对该问题,提出WiMAX网络环境下基于SIP协议的无线列调系统结构,对SIP协议消息类型和事务进行扩展,设计信令流程,并给出 SIP 客户端与服务端的扩展实现方案。实验结果表明,该方案满足铁路强拆通话建立的时间要求,可以成功实现强拆。     

Integrating service discovery technologies in OSGi platform

This paper describes the service discovery and interaction for home network devices using heterogeneous standards and protocols. OSGi was proposed to allow several kinds of services coming from different providers to be loaded and run on a gateway. We present a residential gateway based on the OSGi architecture for a smart home network. We combine the SLP SA/DA, the UPnP control point and the SIP UA into the gateway to achieve automated device discovery, registry, and management. Application examples are introduced and the implementation results show that our gateway can provide automatic heterogeneous service or device discovery, registry, and management.     

Structural integrity assessment of weldments at high temperature: A proposed new approach for R5

The R5 procedures provide a comprehensive methodology for the assessment of structures operating within the high temperature creep regime. This includes advice on the modifications required to the basic procedure to account for weldments in creep–fatigue crack initiation assessments. The current approach is based on the use of a Fatigue Strength Reduction Factor (FSRF) which has a value according to the particular class of welded joint. The FSRF affects the calculation of creep and fatigue damage. However, the current approach can be excessively conservative for as-welded weldments which are the main type of weldments in plant.     

Multihomed SIP‐based network mobility for the scheduled public transit service

Network mobility (NEMO) enables a group of nodes to connect to the back‐end infrastructure during the movement. Because a vehicle must provide passengers good enough transmission quality, various access techniques, for example, 3 G/3.5 G, Wi‐Fi or dedicated short range communication, can be simultaneously equipped to aggregate bandwidth and tolerate link failure. This paper extends the Session Initiation Protocol (SIP)‐based NEMO framework to support multihoming. First, IEEE 802.21 Media Independent Handover (MIH) is integrated to manage multiple egress interfaces in an on‐board unit (OBU). Second, a dynamic synchronization mechanism using the SIP SUBSCRIBE and NOTIFY methods is proposed to manage multiple OBUs in a vehicle. Furthermore, the framework is applied to public transportation systems, for example, bus, train, or mass rapid transit. Passengers may need to transit several times during their journeys. The transit behavior must induce a flood of signaling messages for location update. In this paper, the SIP REFER method is exploited to reduce signaling messages while a group of passengers have scheduled their transit in advance. Copyright © 2011 John Wiley & Sons, Ltd.