Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)最新文献_第7页

Study of the electron beam diagnostics and beam waist 电子束诊断与束腰的研究

Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711523

M. Ragheb, S. Zakhary

引用次数: 5

Performance constraints generation for analog circuit layout 模拟电路布局的性能约束生成

Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711497

I. Mahmoud

引用次数: 1

Analysis of incoherent pre-RAKE TDD/DPSK/CDMA wireless portable communications 非相干预rake TDD/DPSK/CDMA无线便携通信分析

Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711474

S. El-Khamy, E. Sourour, T. Kadous

引用次数: 2

Analysis of cylindrical frequency selective surfaces 圆柱频率选择曲面的分析

Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711453

M. Mokhtar

引用次数: 5

An implementation scheme for a Viterbi decoder 维特比解码器的实现方案

Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711484

M. Aboul-Dahab, M. Ashry, S. A. Salih, M.E. Abd-El-Galil

引用次数: 0

The effect of HF electrical field on beam-plasma interaction in a plasma waveguide 高频电场对等离子体波导中束流-等离子体相互作用的影响

Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711521

V. Demchenko, K. El-Shorbagy, S. Khalil, N. G. Zaki

{"title":"The effect of HF electrical field on beam-plasma interaction in a plasma waveguide","authors":"V. Demchenko, K. El-Shorbagy, S. Khalil, N. G. Zaki","doi":"10.1109/NRSC.1998.711521","DOIUrl":"https://doi.org/10.1109/NRSC.1998.711521","url":null,"abstract":"In this paper we investigate the stabilizing effect of a strong HF (pump) electrical field on a two-stream (Buneman) instability in a plane and cylindrical plasma waveguide. Starting from the two-fluid plasma model we separate the problem into two parts. The \"temporal\" (dynamical) part enables us to find the frequencies and growth rates of unstable waves. This part within the redefinition of natural (eigen) frequencies coincides with the system describing HF suppression of the Buneman instability in a uniform unbounded plasma. Natural frequencies of oscillations and spatial distribution of the amplitude of the self-consistent electrical field are obtained by solving a boundary-value problem (\"spatial\" part) considering a specific spatial distribution of plasma density. It is shown that, independent of the geometry of the problem, the conclusion that HF stabilization of Buneman instability in plasma waveguides remains valid. The influence of the HF electric field on the instability of a low-density electron beam passing through a plasma waveguide is reported. It is found that the HF field has no essential effect on the frequencies and growth rates of unstable surface waves which are excited by the beam in the plasma waveguides. The region of instability only slightly narrows and the growth rate decreases by a small factor.","PeriodicalId":128355,"journal":{"name":"Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127180580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Robust autopilot design for a beam rider guided missile system 载束导弹系统的鲁棒自动驾驶仪设计

Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711489

G. El-Sheikh, S. Bahgat

引用次数: 0

Effective implementation of a parallel software on a multiprocessor system 并行软件在多处理器系统上的有效实现

Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711463

M. Tayel, M.G. Eldin Ahmed

{"title":"Effective implementation of a parallel software on a multiprocessor system","authors":"M. Tayel, M.G. Eldin Ahmed","doi":"10.1109/NRSC.1998.711463","DOIUrl":"https://doi.org/10.1109/NRSC.1998.711463","url":null,"abstract":"If a software system can be structured as a collection of largely independent subtasks, significant reduction in elapsed time can be realized by executing these subtasks in parallel on multiple processors. The total amount of processor idle time increases with the number of processors; due to factors such as contention for shared resources, intercommunication, and software structure. In this paper the inherent parallelism of a software system is investigated. A new definition for the partial average parallelism is introduced. Using this definition two analytical expressions are developed to compute the minimum number of processors executing a parallel software at maximum obtainable speedup, and to compute the minimum time to execute a software in a fixed number of processors. The presented example shows that these two expressions are extensively useful when choosing the optimal schedule algorithm. The exact location of the knee (the point where the benefit per unit cost is maximized) is very important in multiprogramming environment where maximum efficiency is required. An expression for the number of processors at the knee is also deduced. A computer program is given that calculates the minimum number of processors, the minimum time, and the exact location of the knee.","PeriodicalId":128355,"journal":{"name":"Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128701642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

New source models for center-fed cylindrical dipoles 中心馈电圆柱形偶极子的新源模型

Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711451

H. Elkamchouchi, M. Elrakaiby

引用次数: 0

Study and modeling of a new MOSFET device for precision detection of microwave signal polarization 一种用于微波信号极化精密检测的新型MOSFET器件的研究与建模

Proceedings of the Fifteenth National Radio Science Conference. NRSC '98 (Cat. No.98EX109) Pub Date : 1998-02-24 DOI: 10.1109/NRSC.1998.711508

A. El-Hennawy, E. Yousry, A. Ramadan, H. Abd El-Hameed, M. Abd El-Fatah

引用次数: 0