Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249)最新文献_第7页

Plasma torch device for micro-machining applications 用于微加工的等离子炬装置

Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760948

O. Mostafa

引用次数: 0

Study of tropospheric surface refractivity in Lebanon 黎巴嫩对流层表面折射率的研究

Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760942

S. Chahine, H. N. Kheirallah, M. Ayoub

引用次数: 1

Different lattice structure filter to estimate single sinusoidal signal frequency 不同晶格结构滤波器估计单正弦信号的频率

Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760920

N. Amin

引用次数: 0

Simulation of transceiver for multi-amplitude continuous phase modulation 多幅连续调相收发机的仿真

Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760926

E. Youssef, S.H.N.-E. Din, M. Khedr, A. A. Salman

引用次数: 0

Remote monitoring of nuclear explosions during radio sounding of ionosphere over explosion place 爆炸地点电离层无线电测深期间核爆炸的远程监测

Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760866

V. M. Krasnov

{"title":"Remote monitoring of nuclear explosions during radio sounding of ionosphere over explosion place","authors":"V. M. Krasnov","doi":"10.1109/NRSC.1999.760866","DOIUrl":"https://doi.org/10.1109/NRSC.1999.760866","url":null,"abstract":"To solve the non-proliferation problem of nuclear weapons it is necessary to develop methods to identify and monitor underground nuclear explosions remotely. At present the basic method used to monitor underground nuclear explosions remotely is seismic. Because of the potential for rogue nations to test nuclear weapons of smaller and smaller yields, and because of the existence of methods to decrease the seismic efficacy of explosions, it is necessary to further develop the seismic method as well as new alternative means of detecting and identifying underground nuclear explosions. Ionospheric radio sounding, which can detect the ionospheric effect of weak blast waves above the explosion location, is such a promising alternative. An underground explosion initiates a complex sequence of physical processes. The shock wave produced by the explosion passes through soil and causes vertical motion of the ground surface. An acoustic impulse produced by the ground surface motion propagates upward through the atmosphere, growing as it ascends (due to an atmospheric mass density that decreases with increasing altitude). At ionospheric heights (from 70 to 400 km), the acoustic impulse couples with free electrons (via collisional coupling with ions) to perturb the ambient electron density. The electron density perturbation can be detected by radar waves propagating through the disturbed ionosphere.","PeriodicalId":250544,"journal":{"name":"Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130752543","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

Applications of electret and radon-box in the estimation of radon concentration 驻极体和氡盒在氡浓度估算中的应用

Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760956

M. Hussein, M.R.A. Huwait

{"title":"Applications of electret and radon-box in the estimation of radon concentration","authors":"M. Hussein, M.R.A. Huwait","doi":"10.1109/NRSC.1999.760956","DOIUrl":"https://doi.org/10.1109/NRSC.1999.760956","url":null,"abstract":"This work describes a technique for accurate radon and thoron associated measurements in the environment, This technique is called electret technology. The theory of such technology is described in detail. Also, it describes the radon/thoron calibration facility designed and constructed for the first time through the radiation safety program of Atomic Energy Authority in Egypt. It is called a radon/thoron box. The use of the radon/thoron box is very simple either for system calibration or in measurement for different radioactive gases. Radon/thoron gas is injected into one side of the radon/thoron glass box and exhausted from it through the opposite side. The residence time of the radioactive gases in the container can be varied as well by changing the inlet and exhaust flow rates. During the time the radioactive gases stay in the box, they decay into their short-lived daughter products. The radon/thoron box atmosphere can be controlled within a wide range of condition including radiation levels, electric charge concentration, relative humidity, and temperature. In this study, it is found that the radon concentration varies with time as a power function: Rn con=4.7127T/sup 0.7258/, R/sup 2/=0.9478.","PeriodicalId":250544,"journal":{"name":"Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130177278","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

A new channel assignment algorithm for dual-mode cellular system 一种新的双模蜂窝系统信道分配算法

Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760894

H. Tawfik

引用次数: 3

Development of radio frequency ion sources and their applications 射频离子源的发展及其应用

Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760954

M. Abdelaziz, S. Zakhary

{"title":"Development of radio frequency ion sources and their applications","authors":"M. Abdelaziz, S. Zakhary","doi":"10.1109/NRSC.1999.760954","DOIUrl":"https://doi.org/10.1109/NRSC.1999.760954","url":null,"abstract":"In this paper a review is made of the main developments of RF ion sources. These developments are directed towards intensifying the plasma, improving the ion beam quality and increasing the extent of the highly charged ion species in the ion beam. In the radial extraction type, the proper position for ion beam extraction is made as near as possible to the highest plasma intensity in the discharge bottle to allow for extraction of high ion current in order to intensify the plasma and increase the extracted ion current from the discharge, the discharge bottle was made with: a mechanical constriction, immersed in the axial magnetic field and a simple electron gun is sealed with it to inject electrons (with sufficient energy /spl sim/150 eV) into the plasma. Improving the beam uniformity is achieved in the broad beam RF ion source through the use of a multi-aperture graphite cathode with exit apertures distributed to perform perveance matching. On the other hand, the insertion of the RF antenna in the vacuum arc ion source (cold cathode type) reduces the ignition voltage and allows for extraction of higher ion currents at lower extraction voltages (50 up to 300 V). Also in this article a brief review is given of the main industrial processes in which RF ion sources have already been used or are potentially fitted. These processes are used for removal, deposition as well as modification of material.","PeriodicalId":250544,"journal":{"name":"Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125966783","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

Transmission through metallic holes arranged for applications in microwave circuits 用于微波电路的金属孔传输

Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760872

A. Zeid, H. Baudrand

引用次数: 0

Pulse width multiplier circuit with application to digital phase measurements 应用于数字相位测量的脉宽倍增电路

Proceedings of the Sixteenth National Radio Science Conference. NRSC'99 (IEEE Cat. No.99EX249) Pub Date : 1999-02-23 DOI: 10.1109/NRSC.1999.760885

M. A. El-Ela, A. Telba

引用次数: 0