17 resultados para Socket

em Chinese Academy of Sciences Institutional Repositories Grid Portal


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A new methodology is proposed in this paper to predict the lowest power consumption for a double-tube-socket (DTS) pneumatic conveying system. This methodology is established on both experimental work and numerical simulation. After parametric studies by numerical simulation, the desired conveying cases which have the lowest power consumption were obtained. Finally those cases were carried out in our experimental system. The measured power consumption was close to that predicted. In this paper the experimental work is discussed and the numerical simulation introduced. (c) 2010 Elsevier B.V. All rights reserved.

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A pipeline with a bypass is widely used for the pneumatic conveying of material. The double-tube-socket (DTS (R)) technology, which uses a special inner bypass, represents the current state of the art. Here, a new methodology is proposed based on the use of computational fluid dynamics (CFD) to predict the energy consumption of DTS conveying. The predicted results are in good agreement with those from pilot-scale experiments. (C) 2010 Elsevier Inc. All rights reserved.

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A new methodology based on the use of CFD is proposed to estimate the energy consumptions in a DTS (DOUBLE-TUBE-SOCKET) pneumatic conveying. A simple computational program based on this methodology is developed. It can directly give the lowest energy consumption and the compatible gas consumption by only input the distance of conveying and the conveying tonnage. This computational program has been validated through our experimental work.

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基于计算流体力学理论,提出一种可用于预测双套管密相气力输送系统能耗的新方法.与以往依靠经验的计算方法不同,本工作将输送管道分为起始段与充分发展段两部分,分别进行详细的计算流体力学模拟后汇总得出整个系统的总能耗.压力梯度为750 Pa/m的情况下,计算所得物料输送速率为10 t/h,耗气量为290 m~3/h,实验所得物料输送速率为8.0 t/h,耗气量240 m~3/h,证明本数模方法是可靠的.

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For goldfish (Carassius auratus), there are many varieties with different eye phenotypes due to artificial selection and adaptive evolution. Dragon eye is a variant eye characterized by a large-size eyeball protruding out of the socket similar to the eye of dragon in Chinese legends. In this study, anatomical structure of the goldfish dragon eye was compared with that of the common eye, and a stretching of the retina was observed in the enlarged dragon eye. Moreover, the homeobox-containing transcription factor Six3 cDNAs were cloned from the two types of goldfish, and the expression patterns were analyzed in both normal eye and dragon eye goldfish. No amino acid sequence differences were observed between the two deduced peptides, and the expression pattern of Six3 protein in dragon eye is quite similar to common eye during embryogenesis, but from 2 days after hatching, ectopic Six3 expression began to occur in the dragon eye, especially in the outer nuclear layer cells. With eye development, more predominant Six3 distribution was detected in the outer nuclear layer cells of dragon eye than that of normal eye, and fewer cell-layers in outer nuclear layer were observed in dragon eye retina than in normal eye retina. The highlight of this study is that higher Six3 expression occurs in dragon eye goldfish than in normal eye goldfish during retinal development of larvae. (C) 2007 Elsevier Inc. All rights reserved.

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D-vision系统(这里"D"有"Divide Screen"和"Duplex-Vision"双重含义)是一类基于PC机群的多投影虚拟现实系统(或简称多投影系统).给出D-vision系统中双手6自由度力觉交互的实现过程:在客户端协同控制两个力觉交互设备Spidar-G(Space Interface for Artificial Reality withGrip)实现双手协作交互,其次构造一个基于UDP的Socket类完成客户端和绘制服务器节点之间的通讯,传递跟踪球的位置、方向等信息;然后,通过分布绘制实现在大屏幕上无缝显示.最后实验结果表明:在D-vision系统中双手6自由度力觉交互是一种自然直观的人机交互方式.

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目前分布式体系结构的研究重点是提高系统的可扩展性、互操作性和可重用性,而对于实时性要求高的分布式仿真系统,还需要在HLA体系结构基础上,考虑如何提高系统的数据传输效率,以满足实时性要求。本文从应用层角度出发,从以下两个方面研究了改进策略: 一,从数据交互方面考虑,为了提高分布式仿真系统内部有效数据传输效率,满足系统实时性要求,以车辆定位仿真系统为问题原型,提出一种基于运行时间支撑系统数据分发管理(RTI-DDM)和套接字(Socket)的双层数据传输模型:一方面利用RTI-DDM来限定传输数据的范围,依据待交互的数据值域对数据的发送和接收进行过滤,有效降低系统内部冗余数据的传输;另一方面,利用Socket技术在仿真实体之间建立点对点的直接传输,从而提高系统的运行效率。对比实验结果表明,在相同的仿真交互数据量下,该模型相对于传统单层RTI数据传输模型,数据传输延时平均缩短70%。 二,从时间管理方面考虑,本文通过实验验证的方法,分析不同时间管理策略对仿真系统的数据传输和运行控制的影响,并针对车辆定位仿真系统中联邦成员之间的数据交互和逻辑控制关系特点,选择合适的时间管理策略,保证数据因果关系的正确性,进一步提高了系统的数据传输性能。 实验和应用结果表明,本文提出的改进策略简单有效,提高了系统数据传输效率,较好的解决了基于HLA/RTI的定位仿真系统的实时性问题。

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本文主要介绍了一种基于TI公司MSC1210的经济可行的对前端电源模拟量的远程实时监测系统,在监测频率要求不高的情况下,可以取代NI的6133数据采集系统。

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介绍了用微控制器实现的兰州重离子加速器冷却储存环工程(HIRFL-CSR)束流注入线电源控制系统中前端网关的远程复位控制,其中包括用AT89C51单片机实现的前端智能电路模块、AT89C51单片机的运行程序、中心控制室通讯应用程序。该系统成功实现了科研中束流调节人员可以在不用到现场的情况下远程复位前端发生死机的网关。该系统工作稳定,抗干扰强,没有发生误操作,实现了科研当中对前端设备的远程控制,大大提高了科研工作人员的工作效率。

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为了实现对物理实验装置的远程监控和访问,将采用32位芯片技术和基于面向对象的网络Socket编程模式来实现控制系统的网络通讯。S3C4510B是三星公司针对网络应用而设计的CPU,本身带有100M网络控制器,而uClinux系统拥有完善的TCP/IP协议,故两者的结合为用户提供了强大的网络服务功能。本系统利用嵌入式网络技术可稳定可靠的实现数据的快速获取与给定。

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介绍了Winsock API(Windows Sockets API)通信原理,讨论了Winsock API实现异步通信的具体方法,以及解决多客户端的连接技术,最后给出了相应的关键性程序代码。

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以微机操作 CAMAC设备为例讲述了实现 I/ O级网络通信的具体过程和步骤 .首先在单机环境下完成了 CAMAC设备接口程序的设计 ;然后在选用 TCP/ IP协议的条件下 ,利用Windows sockets技术实现 Windows环境下的 I/ O级网络通信 ,其中参与网络通信的程序双方是以客户机和服务器的形式存在的

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兰州重离子研究装置(Heavy Ion ReSearch Facility at Lanzhou, HIRFL)是我们研究所得一个大型实验装置,它包括SFC和SSC两个加速器和两条束运线。本论文比较系统地介绍了HIRFL束流诊断系统的改造和SFC分布式控制系统的设计。 在第一章中,简单介绍了国际加速器控制系统的现状和HIRFL控制系统中存在的问题。在第二章一般性地阐述了描述束流品质的各个参数,这些参数的测量原理以及测量这些参数的装置。本论文的第三章详细叙述了HIRFL束流诊断系统的改造方法、过程和结果,结果准确可靠,人机界面非常友好,给调束带来很大的方便。第四章介绍了计算机网络的基本概念,描述了在选用TCP/IP协议的条件下,利用Socket(套接字)实现Windows环境下的实时网络通信的具体过程和步骤,其中参与通信的双方是以客户机和服务器的形式存在的。第五章讲述了SFC分布式控制系统的实现,并在实时网络通信的基础上完成了ECR源扫谱程序和I/O级的网络通信程序。 论文的最后一章,介绍了对HIRFL束运线进行优化控制的一个设想,利用系统辨识的方法可以得到束运线的数学模型,并提供了自适应控制的实现细节,这也是作者对实现HIRFL优化控制的一个愿望。

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探讨了Linux平台下多线程技术和套接字网络通讯问题,在此基础上利用互斥锁和条件变量技术设计了一个面向连接的多线程并发服务器的详细算法。最后给出了基于Posix线程库的Linux系统下用C++实现多线程并发服务器的基本程序框架。实际项目应用表明这种基于多线程的并发服务器结构在完善程序功能的同时还可以有效提高其服务性能。