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In order to design the high performance ATM switch, it is very important to study on traffic management, especially ABR flow control, in ATM networks.

研究ATM网络的流量管理，特别是其中的流量控制，对设计高性能的ATM交换机是非常必要的。

La Jolla, CA —Researchers at the Salk Institute for Biological Studies in collaboration with scientists at the University of California, San Diego took a high resolution "action shot" of a protein switch that plays a crucial role in the development of the nervous system.

Salk研究所与加州大学圣地亚哥分校的研究人员合作，利用高分辨率的3D影像，捕捉神经系统发育过程中重要的蛋白质开关Scp1之作用。

The 1989-1992 (4th generation) offered in other countries received unheard of equipment for an Accord such as a Navigation System, TV, mini-disc player, digital automatic climate control, traction control, Anti-Lock brakes, side-marker lights, heated mirrors, outside temperature gauge, an in-cabin air refiner, map lights, seat heaters, standard fog lamps, headlight washers, rear fog light, full-power seats, telescoping bumper pole, half-mast antenna switch.

在1989-1992年，在其他国家提供的接收设备没有听说过一个协议，如导航系统，电视，微型碟播放器，数码自动气候控制系统，牵引力控制系统，防抱死制动系统，侧-廓灯，可加热后视镜，室外温度测量仪，一个舱内空气炼油，阅读灯，座椅加热器，标准的雾灯，头灯清洗装置，后雾灯，全电动座椅，保险杠伸缩杆，半旗天线开关。

In addition,but also has the train already the signal which opens close,closes suddenly for some reason,this wants the time delay unlocking,in order to avoid the train breaks in time meets is rotating the rail switch.

此外，还有列车已接近开放的信号，因故突然关闭，这就要延时解锁，以免列车冲入时遇到正在转动中的道岔。

Taking the high-voltage switch with the ZL101A cast ing smelting technology as the example,on the one time smelting technology of the Al-Si alloy in the cast ing is studied in this paper and producing scene,and the technology process is introduced in detailed.

以高压开关用ZL101A铸件的熔炼工艺为例，对ZL101A在铸造生产现场的1次熔炼工艺进行了研究，并介绍了具体的工艺措施。

Star Fort enterprise groups established in Taiwan 24 years to the social environment in Taiwan familiar with the master switch for the highest quality customer service in the Taiwan region has set up more than 18,000 customers of the network security services network, including Taiwan weight level departments and units, factories, shops, private homes, etc., and the vast majority of customers for the long-term stability.

星堡企业集团于台湾成立24年来，以对于台湾社会环境的熟悉掌握，转为对于客户最优质周到的服务，于台湾地区已建立18，000多家的客户安全防范联网服务网络，包括台湾重量级机关单位、工厂、商铺、私人住家等，且绝大多数为长期稳定客户。

I used the homemade ECDL to measure the 2S-3D two photon transition spectrum of Helium , the advantages are that the expense of homemade ECDL is cheap and have good output power. At the same time, I used the electronic part can be got in the market to manufacture a pulse generator in the experiment, the pulse generator can control the output frequency, the pulse width, the relative phase and also can simultaneously control four sets of systems or instruments need the TTL pulse control. The advantage is that the cost of the pulse generator is cheap and the pulse generator is stable. To isolate the magnetic field I used the magnetic foil to helium cell. I also built a gas discharge system, the switch sequence of this system can be controlled by the pulse generator. Finally I built a detecting system can measure the helium energy state. It is cheap and can be combined with the comb laser system in my laboratory.

本实验是利用一台自制的外腔雷射系统来量测2S-3D的氦原子双光子跃迁，其优点在於自制的外腔雷射之费用非常便宜，也有不错的输出功率，同时在实验中我利用市售的电子零件制作了一台脉冲产生器，可控制输出的频率、脉冲宽度以及相对的相位，且可同时控制四套需要TTL脉冲控制的系统或仪器，优点除了便宜之外，也非常稳定；为了隔绝磁场，利用了磁场隔绝金属箔，我也在实验室中建立了一组气体放电系统，其系统可以用脉冲产生器来控制开关时序，最后，我建造了一个氦原子能阶的量测系统，而且费用低廉，可与本实验室的另外一门研究光梳雷射系统做结合。

In that case, a "safety switch" placed in front of you, in the end it is dedicated for safety how much?

那么，一台&安全交换机&摆在你面前，它到底为安全奉献了多少呢？

This thesis discusses firstly the IGMP, describes the specification of the protocol and explains the differences between the three different versions of protocol. Then the RPF rule used by the router to forward multicast packets and the multicast forwarding tree are discussed. The process of building SPT and RPT is also illustrated. In this thesis, we also discuss the mechanism of Flooding and Pruning in Dense-Mode multicast routing protocol and the process of switch from RPT to SPT in Sparse-Mode routing protocol.

本论文讨论了实现IP组播的IGMP协议，对IGMP协议的协议规范进行了描述，并对IGMP三个版本的不同点作了详细说明；讨论了进行组播数据包进行转发的RPF基本原理、组播转发树的类型，并对SPT树和RPT树的建立过程进行了探讨；并分别对密集模式组播路由协议的扩散和剪枝机制、稀疏模式组播路由协议中的RPT树到SPT树的切换过程进行了详细的探讨。

Its function is to improve the effect in the course of education and the quality in the study of students with the computer technology and the audiovisual. The electric appliance of the high/low-tension switch is the very important equipment of protect in the electrical transmission.

其目的是应用计算机技术和视听媒体来改革教与学的过程，最大限度地提高教学的质量和效益，全面地提高学生的素质，促进学校由&应试教育&向&素质教育&转变。

If you are committed to an education career, then the Master of Arts in Education from Ashford University is for you.

如果你是致力于教育事业，那么，艺术教育硕士学位阿什福德大学是给你的。

objective:to explore the expression of survivin protein and its mrna in rectal cancer and their clinic significance.

目的：研究凋亡抑制因子survivin蛋白及其mrna在直肠癌组织中的表达及其与临床病理关系。