Journal of the A.I.E.E.最新文献_第5页

Aeronautical radio communications 航空无线电通信

Journal of the A.I.E.E. Pub Date : 1930-11-01 DOI: 10.1109/JAIEE.1930.6537007

E. Sibley

{"title":"Aeronautical radio communications","authors":"E. Sibley","doi":"10.1109/JAIEE.1930.6537007","DOIUrl":"https://doi.org/10.1109/JAIEE.1930.6537007","url":null,"abstract":"In addition to the establishment of beacon lights and intermediate landing fields by the Federal Government, additional communication facilities are being provided which will meet the further demands of air transport companies operating under all conditions of weather on Federal airways. These facilities consist of a network of land line services, airways radio stations, and radio range stations along the airways for collecting and broadcasting weather information and for the guidance of aircraft by radio direction. Marker beacons are located at the intersection of the radio range courses to signal the pilot that his receiver-should be adjusted to the frequency of the next radio range. These beacons also serve to give the exact location on the route. The Bureau of Standards and other similar branches of the Government and private concerns are constantly engaged in research and development work. The Federal Radio Commission's aviation plan provides for two-way communications with aircraft by the air transport companies. The aviation plan also provides for a system of communications between airports and aircraft. The services of these companies and airports are coordinated with the facilities provided by the Federal Government.","PeriodicalId":260406,"journal":{"name":"Journal of the A.I.E.E.","volume":"21 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1930-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114027354","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

Abridgment of grounding banks of transformers with neutral impedances and the resultant transient conditions in the windings 中性点阻抗变压器接地组的缩短及由此产生的绕组暂态情况

Journal of the A.I.E.E. Pub Date : 1930-10-01 DOI: 10.1109/JAIEE.1930.6536351

F. J. Vogel, J. K. Hodnette

引用次数: 0

Abridgment of steam power development of the Pacific gas & electric company 太平洋煤气电力公司蒸汽动力发展简况

Journal of the A.I.E.E. Pub Date : 1930-10-01 DOI: 10.1109/JAIEE.1930.6536349

R. Powell

引用次数: 0

Abridgment of the East river generating station of the New York Edison company 纽约爱迪生公司东河发电站的删节

Journal of the A.I.E.E. Pub Date : 1930-10-01 DOI: 10.1109/JAIEE.1930.6536352

C. B. Grady, W. Lawrence, R. H. Tapscott

引用次数: 0

Courses in fundamentals of architecture given for illuminating engineers 为照明工程师开设的建筑基础课程

Journal of the A.I.E.E. Pub Date : 1930-10-01 DOI: 10.1109/JAIEE.1930.6536365

H. Broadbent

引用次数: 0

Abridgment of the calculation of cable temperatures in subway ducts 地铁管道电缆温度计算的删节

Journal of the A.I.E.E. Pub Date : 1930-10-01 DOI: 10.1109/JAIEE.1930.6536356

W. B. Kirke

{"title":"Abridgment of the calculation of cable temperatures in subway ducts","authors":"W. B. Kirke","doi":"10.1109/JAIEE.1930.6536356","DOIUrl":"https://doi.org/10.1109/JAIEE.1930.6536356","url":null,"abstract":"Underground transmission and distribution circuits are being continually extended, and large amounts of new capital invested each year in the conduit and cable systems which this extension requires. More and more frequently the cable engineer is called upon for accurate information as to the maximum loads that may safely be impressed on underground cables without exceeding the temperature limits recognized in present day practise. The importance of the study of cable temperatures has long been recognized, and much excellent material has been published concerning its several phases. In particular, the copper temperature rise of loaded cables above the surrounding air has been fully analyzed. Less thorough treatment, however, has been given the determination of the temperatures existing in loaded duct structures, and to the behavior of cables carrying cyclic loads. It is the purpose of this paper to present a comprehensive survey of the whole problem of cable temperatures by consolidating information on cable temperature characteristics with the equally important problem of the characteristics of duct structure when the cable circuits are subjected to the cyclic loads usually found in practise. The information herein presented on the subject of duct bank temperatures is the result of an investigation in the metropolitan district of New York, carried on for several years under widely varying conditions. The constants given for certain types of duct structures may not be universally applicable to other localities, but it is believed that the method of attack will be helpful to other engineers in analyzing test data obtained upon their systems and in separating the various factors involved.","PeriodicalId":260406,"journal":{"name":"Journal of the A.I.E.E.","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1930-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122510443","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: 7

Abridgment of railbonding practise and experience on electrified steam railroads 电气化蒸汽铁路轨道连接实践与经验总结

Journal of the A.I.E.E. Pub Date : 1930-10-01 DOI: 10.1109/JAIEE.1930.6536363

H. F. Brown

引用次数: 0

Abridgment of high-speed protective relays 高速保护继电器的缩短

Journal of the A.I.E.E. Pub Date : 1930-10-01 DOI: 10.1109/JAIEE.1930.6536353

L. N. Crichton

{"title":"Abridgment of high-speed protective relays","authors":"L. N. Crichton","doi":"10.1109/JAIEE.1930.6536353","DOIUrl":"https://doi.org/10.1109/JAIEE.1930.6536353","url":null,"abstract":"During the past year or so, studies of stability have been made to determine methods of preventing loss of synchronism upon the occurrence of faults. Of the several methods found, the most obvious and effective is the high-speed isolation of the faulty section of the line; and this of course means high-speed relays and high-speed breakers. Investigation so far has indicated that the time required depends upon the type of fault. Since a three-phase short circuit prevents the flow of synchronizing power, it is the most serious type and must be cleared in from six to ten cycles. This demands the use of relays which will operate “instantaneously.” Recent suggestions have been numerous, and these are discussed, this discussion covering relays operating at normal frequency and those which have been operated or suggested for higher superimposed frequencies. While there is a number of difficulties attendant on the design of high-speed relays — these troubles depending on the type and construction of the relay — still high-speed relays may be made to operate on any of the present well-known principles, such as impedance principle, current balance principle, etc. They may employ either a mechanical structure or may make use of thermionic or gas-filled tubes. Attention is given to a mechanical relay of the impedance type operating with a speed of one cycle or less. Some discussion is also given of the reactance type relay with mention of its limitations, particularly that of the extra time required for its initialing element to operate. The effect of resistance at the point of fault (arc resistance) is discussed and the conclusion drawn that, for extremely high-speed operation, it does not interfere with satisfactory relay performance. This is because of the time required for the arc resistance to increase to an appreciable value.","PeriodicalId":260406,"journal":{"name":"Journal of the A.I.E.E.","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1930-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127190962","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

Abridgment of the effect of transient voltages on dielectrics — IV: Law of impulse spark-over and time lag: Relative effects of different wave shapes — Comparison of lightning waves and laboratory waves — Coordination of line insulation 瞬态电压对电介质影响的简记。第IV部分:脉冲闪过和滞后规律:不同波形的相对影响。闪电波和实验室波的比较。线路绝缘的协调

Journal of the A.I.E.E. Pub Date : 1930-10-01 DOI: 10.1109/JAIEE.1930.6536359

F. Peek

引用次数: 0

Abridgment of the M. I. T. network analyzer: Design and application to power system problems m.i.t.网络分析仪的精简:电力系统问题的设计与应用

Journal of the A.I.E.E. Pub Date : 1930-10-01 DOI: 10.1109/JAIEE.1930.6536360

H. Hazen, O. R. Schurig, M. F. Gardner

引用次数: 2