“热气球”演示实验创新设计

初中物理"研究物体的浮沉条件"一节中,涉及到浮沉条件在技术上的应用,其中热气球的工作原理,如果只是通过几张图片单纯的介绍,学生理解、记忆有一定的难度,这种教学方法很容易让学生产生疲劳,也不符合新课改理念.为了活跃课堂气氛,调动学生学习的主动性.怎样能让"热气球"走进教室呢?开始,笔者想到了"孔明灯",但是"孔明灯"的蜡块燃烧起来火力太猛,在小小教室里演示,安全措施无法保证于是,把     

化学危险药品管理与实验室安全措施

在大专院校及中学化学实验室中,危险药品较多,我们在日常工作中经常发现在危险药品的保管、取用、操作过程中存在安全隐患,发生事故后不能及时采取有效措施。本文从实际工作角度出发,对化学危险品的管理、化学实验室常见事故的防范与处理措施进行论述。     

向心力与火车转弯

分析了火车转弯时向心力的来源、转弯时的安全措施、转弯时有关现象的原因.     

同步摄影控制系统设计中的有关问题

本文介绍了同步摄影控制系统设计中的有关问题,包括PWM脉冲产生及功率驱动问题,速度和相位的检测方法及精度问题,有关起动控制算法的问题,以及有关安全保护措施的问题等.在系统设计中解决好这些问题,我们就能获得性能优良的同步摄影控制系统.     

Secure Communication Based on Quantum Key

We introduce a protocol for QKD based on reusable entangled states. In this protocol, the EPR pairs act as a quantum key to encode and decode information particles. And only an information particle travels between the legitimated users. This improves the security and efficiency of communication. In addition, we show that its extension to a new QSS protocol is also secure and efficient.     

Strategy and Management of Network Security at KEK

Recently the troubles related to the network security have often occurred attacks.It consists of two fundamental thinge;the monitoring and the access control.To monitor the network,we have installed the intrusion detectioin system and have managed it since 1998,For the second thing,we arranged three categories to classify all hosts (about 5000 hosts) at KEK according to their security level.To realize these three categories,we filter the incoming packet from outside KEK whether it has a SYN flag or not.The network monitoring and the access control produced good effects in keeping our security level high.Since 2000 we have started the transiton of LAN from shared-media network to switched network.Now almost part of LAN was re-configured and in this new LAN 10Mbps/100Mbps/1Gbps Ethernet are supported.Currently we are planning further speedup(10Gbps)and redundancy of network.Not only LAN but also WAN,network speed will be upgraded to 10 Gbps thanks to the strong promotion of IT by Japanese government,In this very high speed network,our current strategy will be affected and again the network security becomes a big issue,This paper describes our experiences in practice of the current strategy and management know-how together with the discussion on the new strategy.