包装危险货物装卸码头消防及安全技术要求

目前的码头相关规范重点聚焦液体散装危险货物码头,缺少适用包装危险货物装卸码头的技术标准。为明晰包装危险货物码头消防及安全技术要点,采用规范梳理法、逻辑推理法、经验总结法,对包装危险货物装卸码头涉及的船型、火灾危险性定性、安全距离、平面布置、工艺设备配置、消防设计和安全设施设计要点进行分析,提出包装危险货物装卸码头设计时消防及安全技术要点。     

我国包装企业发展电子商务的策略分析

随着信息技术、通讯技术的迅速发展,各行各业对发展电子商务越来越重视,不少有实力的企业争先实施电子商务,把传统业务的部分或全部都搬到了网上,以使企业在竞争中处于绝对的优势。作为包装企业,由于其行业的特殊性,要发展电子商务必须清楚地认识到自身存在的诸多问题,要统一思想,充分认识到发展电子商务的意义和重要性,组织专门力量制定中长期电子商务发展战略,努力提升包装企业的核心竞争力。     

整车CKD出口前后围的包装设计

简要介绍客车CKD生产过程中交货状态对后续工作的重要性,及在本次CKD项目中,前后围按焊合总成件交货时集装箱的选用以及前后围包装和运输方案的设计思路。     

Experimental study on frictional and sealing performances of packing rings in an oil-free gas compressor

To enhance the reliability and to extend service life of packing rings, tribological and sealing performances are investigated based on the experimental results. Friction force, leakage rate and power consumption of three materials of pressure packing seals are measured in a refitted vertical gas compressor. The rings are made of common filled polytetrafluroethylene (Filled PTFE), PTFE reinforced with 30% mass fraction carbon fiber (30%CF+PTFE), and carbon-carbon composites infiltrated with PTFE (C/C+PTFE), respectively. It is found that packing rings will periodically vibrate with the periodic vibration of pressure packing after the travel direction of motion abruptly turns to the reverse direction. Furthermore, the amplitude of vibration slows down with the increasing crank angle. Approximate value of friction force is available by multiple-point fast Fourier transformation (FFT) employed to process the experimental results by reducing the impact of vibration to a great extent. Of three materials of rings employed in experiments, Filled PTFE presents minimal leakage rate accompanied with maximum power consumption. And 30%CF+PTFE exhibits minimum friction power and moderate leakage rate. As for C/C+PTFE, its high mechanical and thermal properties are favorable factors to enhance the ability of operating under high pressure and velocity and to improve the wear resistance. Unfortunately, this also leads to a large leakage rate. Comprehensive consideration should be taken into to evaluate the availability, reliability and service life for a type of packing ring under dry running conditions.     

用结构化非线性最小范数法识别包装系统模态参数

考虑到包装系统的复杂性,可将包装件建模为多模态系统.对结构化非线性最小范数法进行改进,推导出了识别系统自由响应的零点和留数的迭代法,该方法采用以Prony方法识别出的系统的零点和留数为迭代起点,模拟结果表明：该方法与Prony方法相比具有更好的精确性,为准确识别包装系统各模态的参数打下基础.     

文物建筑旅游规划的创新——以洛阳关林为例

古文物建筑群中的跨院是休闲娱乐和生态空间,在文物建筑群的旅游规划中可以将跨院作为旅游文化的活化展示区,营造交流、和谐、参与的高度旅游体验氛围。在洛阳关林东西跨院旅游规划中,从生态活化、展示手段活化、参与性活动活化等方面继承和创新了跨院旅游功能,为文物建筑旅游规划提供了新的思路。     

定位包装论--关于产品包装的新思维

包装既有“容纳”产品的功能,也有“文饰”产品的作用。对于汽车、火车、飞机、轮船等无须容纳的产品,则可以通过文饰进行包装。显然,提出“定位包装”的概念,不但是包装概念的升华,而且是包装观念的发展。     

Two Bandwidth Packing Algorithms for the Centralized Wireless Network and Their Average-case Analysis

This paper presents a detail analysis of two bandwidth packing algorithms, used for processing connection requests in the centralized wireless network. Each call comes with a specific bandwidth request. A request can be satisfied only if there is sufficient bandwidth available during resource scheduling and allocation. Unsatisfied requests were held in a queue. The metric of bandwidth utilization ratio was used to quantify the performance of our algorithms. By theoretical analysis, our algorithms can improve the average bandwidth usage ratio significantly, about 8%~10% without adding much computation complexity. Moreover, our algorithms outperform next fit with fragmentation (NFF) algorithm when the bandwidth resource is scarce. In this paper, the contributions follows: Introducing bandwidth packing problem into wireless network; Proposing two new bandwidth packing algorithms for wireless network where the complicate scheduling algorithms are prohibited; Studying the average performance of our algorithms mathematically, which agree well with the simulation results.     

F关于《国际船舶安全载运包装的辐放射性核燃料、钚和高放射性废料（INF）规则》修正案生效的公告

国际海事组织海上安全委员会第79届会议于2004年12月10日以MSC178（79）号决议通过了《国际船舶安全载运包装的辐放射性核燃料、钚和高放射性废料（INF）规则》（以下简称“INF规则”）的修正案。     

校园快递包装的绿色回收物流优化建议

大学生是重要的网上购物群体,使高校成为产生快递包装的重要场所。本文以大学校园为研究对象,首先分析大学和全国快递包裹的消费状况和特点,其次找出快递包装回收过程中遇到的问题,最后针对其存在的问题提出快递包装回收物流发展的建议,对我国的可持续发展和低碳环保绿色回收物流理念有着重要意义。