This is a very timely review of body armour materials and systems since new test standards are currently being written, or reviewed, and new, innovative products released. Of greatest importance, however, is the recen...This is a very timely review of body armour materials and systems since new test standards are currently being written, or reviewed, and new, innovative products released. Of greatest importance, however, is the recent evolution, and maturity, of the Ultra High Molecular Weight Polyethylene fibres enabling a completely new style of system to evolve e a stackable system of Hard Armour Plates. The science of body armour materials is quickly reviewed with emphasis upon current understanding of relevant energy-absorbing mechanisms in fibres, fabrics, polymeric laminates and ceramics. The trend in ongoing developments in ballistic fibres is then reviewed, analysed and future projections offered. Weaknesses in some of the ceramic grades are highlighted as is the value of using cladding materials to improve the robustness, and multi-strike performance, of Hard Armour Plates. Finally, with the drive for lighter, and therefore smaller, soft armour systems for military personnel the challenges for armour designers are reported, and the importance of the relative size of the Hard Armour Plate to the Soft Armour Insert is strongly emphasised.展开更多
车牌识别(License Plate Recognition,LPR)是智能交通系统(Intelligent Transport System,ITS)需要解决的重点问题之一,目前的车牌识别系统基本上是以PC机为平台实现的,在成本、体积、灵活性等方面有很大局限性。针对这一问题,设计了一...车牌识别(License Plate Recognition,LPR)是智能交通系统(Intelligent Transport System,ITS)需要解决的重点问题之一,目前的车牌识别系统基本上是以PC机为平台实现的,在成本、体积、灵活性等方面有很大局限性。针对这一问题,设计了一种基于ARM嵌入式平台的车牌识别系统,并针对嵌入式平台改进和优化了车牌识别相关算法,经试验证明本系统不仅准确性好,而且成本低、体积小、功能可扩展性强。展开更多
网格数据库访问与集成是网格数据库重要的研究领域。研究该领域的主要有全球网格论坛(Global Grid Forum,GGF)中的数据库访问与集成服务工作组(Database Access and Integration Services Working Group,DAIS-WG)和合作编程工作的小组OG...网格数据库访问与集成是网格数据库重要的研究领域。研究该领域的主要有全球网格论坛(Global Grid Forum,GGF)中的数据库访问与集成服务工作组(Database Access and Integration Services Working Group,DAIS-WG)和合作编程工作的小组OGSA-DAI(Open Grid Services Architecture-Data Access and Integration),此外还有其他一些研究组织。本文设计了一种基于双层中间件的数据库集成和访问模型(AIGD一DMMS)。展开更多
文摘This is a very timely review of body armour materials and systems since new test standards are currently being written, or reviewed, and new, innovative products released. Of greatest importance, however, is the recent evolution, and maturity, of the Ultra High Molecular Weight Polyethylene fibres enabling a completely new style of system to evolve e a stackable system of Hard Armour Plates. The science of body armour materials is quickly reviewed with emphasis upon current understanding of relevant energy-absorbing mechanisms in fibres, fabrics, polymeric laminates and ceramics. The trend in ongoing developments in ballistic fibres is then reviewed, analysed and future projections offered. Weaknesses in some of the ceramic grades are highlighted as is the value of using cladding materials to improve the robustness, and multi-strike performance, of Hard Armour Plates. Finally, with the drive for lighter, and therefore smaller, soft armour systems for military personnel the challenges for armour designers are reported, and the importance of the relative size of the Hard Armour Plate to the Soft Armour Insert is strongly emphasised.
文摘车牌识别(License Plate Recognition,LPR)是智能交通系统(Intelligent Transport System,ITS)需要解决的重点问题之一,目前的车牌识别系统基本上是以PC机为平台实现的,在成本、体积、灵活性等方面有很大局限性。针对这一问题,设计了一种基于ARM嵌入式平台的车牌识别系统,并针对嵌入式平台改进和优化了车牌识别相关算法,经试验证明本系统不仅准确性好,而且成本低、体积小、功能可扩展性强。
文摘网格数据库访问与集成是网格数据库重要的研究领域。研究该领域的主要有全球网格论坛(Global Grid Forum,GGF)中的数据库访问与集成服务工作组(Database Access and Integration Services Working Group,DAIS-WG)和合作编程工作的小组OGSA-DAI(Open Grid Services Architecture-Data Access and Integration),此外还有其他一些研究组织。本文设计了一种基于双层中间件的数据库集成和访问模型(AIGD一DMMS)。
