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1
Ayre, Steven J., and Jeremy F. Hough. "Air Power in irregular warfare." Thesis, Monterey, California. Naval Postgraduate School, 2012. http://hdl.handle.net/10945/27788.
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History is full of with examples of innovations that have proved essential to victory in war. Few innovations have provided the consistent and often decisive impact that air power has delivered in conflict. Across its relatively short history, the concept of air power has maintained a resiliency of innovation across the doctrinal, strategic, organizational, and technological levels. However, warfare itself has witnessed significant changes over the course of the last century. No longer is the classical, conventional state-on-state conflict the principal method of combating ones enemies. In its place, irregular warfare (IW) has arguably become the norm in conflict today. However, we have yet to see air power applied to modern-era irregular conflicts with the same level of success achieved in past conflicts. This thesis examines the use of air power in IW in order to answer the following questions What organizational forms are associated with the successful use of air power in irregular warfare What technologies What concepts of operations What level of coherence between strategic and operational/tactical execution is associated with the successful use of air power in IW And finally, what should the future role of air power in IW be
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Dyndal, Gjert Lage. "Land based air power or aircraft carriers? : the British debate about maritime air power in the 1960s." Thesis, University of Glasgow, 2009. http://theses.gla.ac.uk/1058/.
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Numerous studies, books, and articles have been written on Britains retreat from its former empire in the 1960s. Journalists wrote about it at the time, many people who were involved wrote about it in the immediate years that followed, and historians have tried to put it all together. The issues of foreign policy at the strategic level and the military operations that took place in this period have been especially well covered. However, the question of military strategic alternatives in this important era of British foreign policy has been less studied. This dissertation discusses such high-profile projects as the TSR.2 and F.111, prospective VTOL aircraft and not least the CVA-01 fleet carrier, but most of all it focuses on the issue of military strategy. The rivalry between the Royal Navy and the Royal Air Force was largely about the questions of carrier aviation versus land-based air power – and which strategic option would best answer the British need to maintain influence as the garrisons were being scaled down. The Royal Navy argued for replacement fleet carriers for their mobile seaborne strategy, while the Royal Air Force argued that land-based air power would be as effective and far less costly. By using this underlying strategic debate as the framework for understanding more specific debates on aircraft, ships and weapon systems, this dissertation aims to bring new light to our understanding of the dramatic restructuring and altered priorities these two military services saw during the 1960s. The story may be divided into three broad periods: From 1960 until mid 1963, it was a conceptual debate on ‘Carrier Task Forces’ and a concrete alternative ‘Island Strategy’. This ended in July 1963 with a Cabinet decision in favour of new fleet carriers. However, the Royal Air Force and the Treasury kept fighting this decision. Their continued resistance, together with the new Labour Government with Denis Healey as Secretary of State for Defence, changed the decision of 1963. The highpoint of the debate on carrier aviation and land-based air power came during 1965-66, ending with the decision of February 1966 to cancel the CVA-01 and gradually phase out the existing carrier fleet. Denis Healey then used the arguments for land-based air power as a rationale for the decision. The dissertation rounds off with a discussion of the planned phase-out of the existing carrier fleet. However, the story saw a different end than planned, as new strategic challenges in home waters came about and the evolving VTOL Harrier aircraft and the ‘through-deck cruisers’ gave new possibilities. This is a historical study of the British debate about maritime air power and strategic alternatives in the 1960s. However, the detailed story and arguments used for and against both alternatives should clearly have relevance to any conceptual debates on carrier and land-based air power.
3
Aitken, David M. "The fallacy of single source fire support." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FAitken.pdf.
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Call, Steven Charles. "A people's air force: Air power and American popular culture, 1945-1965 /." The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487944660929528.
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Jahnke, Todd Eric. "By Air Power Alone: America's Strategic Air War in China, 1941-1945." Thesis, University of North Texas, 2001. https://digital.library.unt.edu/ark:/67531/metadc2800/.
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During World War II, the Army Air Force waged three strategic air offensives in and from China against Japan. At first, the Flying Tigers and 10th Air Force constituted the whole of American aid to China, but the effort soon expanded. Supported by Chiang Kai-shek, Claire Chennault and his 14th Air Force waged an anti-shipping campaign, to which the Japanese Imperial Army responded with Operation Ichigo and against which Joseph Stilwell accurately warned. 20th Bomber Command used B-29s to wage Operation Matterhorn, failed, and later conducted PACAID missions. 14th Air Force then waged a counterproductive transportation campaign as The Pacific War, also known as the Greater East Asian War, ended. Events in the China-Burma-India and China Theaters provide lessons in logistics, targeting, training, and air-ground cooperation that are applicable in the post-Cold War era.
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Martin, Jerome Vernon. "Reforging the sword : United States Air Force tactical air forces, air power doctrine, and national security policy /." The Ohio State University, 1988. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487596807823823.
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Van, Greunen Larey-Marié. "Selection of air pollution control technologies for power plants, gasification and refining processes." Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-04112007-111900.
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Menhinick, Richard Temple. "Sea control & maritime projection for Australia maritime air power and air warfare /." Access electronically, 2003. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20040730.161702/index.html.
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Höglund, Jonas. "Luftmakt : en komparativ studie mellan centrala luftmaktsteorier och svensk doktrin för luftoperationer." Thesis, Swedish National Defence College, Swedish National Defence College, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:fhs:diva-837.
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<p>Att utnyttja flygstridskrafter har sedan tidernas begynnelse varit en effektiv metod att påtvinga motparten sin egen vilja. Sättet man använt flygstridskrafterna på har debatterats under historiens gång. Inom ämnet luftmakt finns det en rad kända och inflytelserika luftmaktsteoretiker som alla har sin idé om hur man bäst utnyttjar flygstridskrafter. Hur ser vår svenska doktrin ut gällande teorier kring luftmakt? Vilka luftmaktsteorier genomsyrar grundtanken bakom hur vi idag vägleder våra luftoperationer? Syftet med uppsatsen är att undersöka vilka generella och centrala luftmaktsteorier som återfinns i den svenska doktrinen. För att kunna svara på mina valda frågeställningar och tillgodose syftet med uppsatsen har jag valt att dela in uppsatsen i två delar. Den första delen är en beskrivande del där jag helt enkelt redogör för vad luftmakt är, presenterar centrala luftmaktsteoretiker och deras teorier samt redogör för vad vår doktrin säger angående luftmakt. Därefter kommer en komparation mellan centrala tankar och teorier kring luftmakt och svensk doktrin för luftoperationer. Resultatet i uppsatsen visar tydliga exempel på att doktrinen återspeglar det bästa hos flera av de centrala luftmaktsteoretikerna. Det centrala i doktrinen är effekttänkandet och utnyttjandet av indirekt metod. Avslutningsvis ser jag en begränsning gällande svensk doktrin och luftmaktsteorier kring strategiska mål och medel nu när Försvarsmakten gått från invasions- till insatsförsvar och därmed minskat på personal och resurser. Frågan är om vi har möjlighet att effektivt verka strategiskt som enskilt land eller om vi är beroende av andra nationer?</p><br><p>To use air power has always been an effective way to affect your opponent. The way you use air power has been debated throughout history. There are a number of famous and influential air power theorists who all have their idea of how to best use air power. How does the Swedish air doctrine describe air power? Which airpower theories work as guidelines for our air operations today? The purpose of this paper is to examine general and central air power theories which can be found in the Swedish doctrine. To be able to answer my questions and to achieve the objective of this paper, I have chosen to divide the paper into two parts. The first part is a descriptive part where I simply describe what air power is, present well known air-power theorists and their theories and outline what our doctrine says about air power. The second part is a comparison between the central ideas and theories about air power and the Swedish airdoctrine. The result of this paper shows that the Swedish air doctrine has been influenced by several air-power theorists. Central in the doctrine are effects-based operations and the use of indirect methods. Finally, I see a limitation in the Swedish air doctrine and strategic air power theories now that the Armed Forces have reorganized, which means less personnel and resources. The question is whether we can effectively operate on a strategic level as a single country or if we are dependent on other nations?</p>
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Ehrhard, Thomas P. "Making the Connection An Air Strategy Analysis Framework /." Maxwell AFB, Ala. : Air University Research Coordinator Office, 1998. http://www.au.af.mil/au/database/research/ay1995/saas/ehrhartp.htm.
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White, Robert Paul. "Air power engineer ; Major General Mason Patrick and The United States Air Service, 1917-1927 /." The Ohio State University, 1999. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488190595939773.
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Vish, Jeffrey A. "Guided standoff weapons a threat to expeditionary air power." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Sep%5FVish.pdf.
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Thesis (M.S. in Defense Analysis)--Naval Postgraduate School, September 2006.<br>Thesis Advisor(s): Robert O'Connell. "September 2006." Includes bibliographical references (p. 55-57). Also available in print.
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Grynkewich, Alexus G. "The use of air power for maritime homeland defense." Thesis, Monterey, Calif. : Naval Postgraduate School, 2006. http://bosun.nps.edu/uhtbin/hyperion.exe/06Dec%5FGrynkewich.pdf.
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Thesis (M.A. in Security Studies (Homeland Security and Defense))--Naval Postgraduate School, December 2006.<br>Thesis Advisor(s): Raymond Roll. "December 2006." Includes bibliographical references (p. 77-93). Also available in print.
14
Ibrahim, Sherine Taher Mahmoud. "Simulation of air-conditioning loads in electrical power systems." Thesis, University of Bath, 1997. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362265.
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Sadler, Zachary James. "Design and Analysis of Compressed Air Power Harvesting Systems." BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/7052.
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Procedure for site discovery, system design, and optimization of power harvesting systems is developed with an emphasis on application to air compressors. Limitations for the usage of infrared pyrometers is evaluated. A system of governing equations for thermoelectric generators is developed. A solution method for solving the system of equations is created in order to predict power output from the device. Payback analysis is proposed for determining economic viability. A genetic algorithm is used to optimize the power harvesting system payback with changing quantities and varieties of thermoelectric generators, as well as the back work put into cooling the thermoelectric generators. Experimental data is taken for laboratory simulation of a power harvesting system under varying resistive load and thermal conductances in order to confirm the working model. A power harvester is designed for and installed on a consumer grade portable air compressor. Experimental data is compared against the model's prediction. As a case study, a system is designed for a water-cooled power harvesting system. Thermoelectric generator power harvesters are found to be economically infeasible for typical installations at current energy prices. Changes in parameters which would increase economic feasibility of the power harvesting system are discussed.
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Anderson, Kevin D. "A false victory for air power: The unsuccessful application of power theory in Kosovo." Connect to online resource, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1456666.
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Burchett, M. H. "An analysis of high power stripline structures." Thesis, University of Bath, 1994. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387177.
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Johnson, Phillip M. "Casting Off the Shadow: Tactical Air Command from Air Force Independence to the Vietnam War." Ohio University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1398949297.
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Waddle, Michael N. "Air Force targeting reform : addressing the need for change /." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Dec%5FWaddle.pdf.
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Thesis (M.S. in Defense Analysis)--Naval Postgraduate School, December 2003.<br>Thesis advisor(s): Anna Simons, Gordon McCormick. Includes bibliographical references (p. 77-78). Also available online.
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Graham, John A. "Automatic seal control in regenerative air preheaters in power stations." Thesis, Queen's University Belfast, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329557.
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Stults, Joshua J. (Joshua John) 1977. "Low power ad-hoc network for ground to air communication." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/86501.
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Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.<br>Includes bibliographical references (leaves 93-95).<br>by Joshua J. Stults.<br>S.B.and M.Eng.
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Van, Jaarsveld Barend Jacobus. "Wide-band modelling of an air-core power transformer winding." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85823.
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Thesis (MScEng)-- Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: The objective of this project is to develop an electromagnetic model that can be used to
accurately calculate the voltage distribution in a transformer winding structure when excited
with standard impulse excitation waves. This voltage distribution is required during the
design stage of a power transformer to ensure that the insulation is capable of withstanding
the occurring electric field stresses during these tests. This study focuses on the modelling
of a single disk-type power transformer winding without the presence of an iron-core.
Methods of calculating self- and mutual-inductances of transformer windings are presented
and validated by means of finite element method software simulations. The same is done for
the calculation methods used for calculating the capacitances in and around the winding
structure. The calculated and FEM-simulated results are compared to measured values as a
final stage of validation. The methods used to calculate the various model parameters seem
to produce results that agrees well with measured values. The non-linear frequency
dependant dissipative nature of transformer windings is also investigated and a methodology
to take this into account is proposed and implemented. The complete modelling
methodology proposed in this thesis, which includes the calculation of the model
parameters, model synthesis and solver algorithm, are applied to an actual case study. The
case study is performed on an air-core reactor manufactured using a disk-type power
transformer winding. The reactor is excited with standard lightning impulse waves and the
voltages along the winding are measured. The calculated and measured voltage wave
forms are compared in both the frequency and time-domain. From the comparison it is
found that the model accurately represents the actual transient voltage response of the testunit
for the frequency range of interest during standard factory acceptance tests.<br>AFRIKAANSE OPSOMMING: Die doel van hierdie projek is om 'n elektromagnetiese model te ontwikkel wat gebruik kan
word om die spanningsverspreiding in 'n transformatorwindingstruktuur te bereken as
standaard weerligimpulstoetse toegedien word. Hierdie spanningsverspreiding word vereis
tydens die ontwerpstadium van ‘n kragtransformator om te verseker dat die isolasie in staat
is om die elektriese veldsterkte tydens hierdie toetse te weerstaan. Hierdie studie fokus op
die modelering van 'n enkele skyftipe-kragtransformatorwinding sonder die teenwoordigheid
van 'n ysterkern. Metodes van berekening van self- n wedersydse-induktansie van
transformatorwindings word aangebied en getoets deur middel van Eindige-Element-Metode
(EEM) simulasies. Dieselfde word gedoen vir die metodes wat gebruik word vir die
berekening van die kapasitansies in en rondom die windingstruktuur. Die berekende en
EEM-gesimuleerde resultate word vergelyk met die gemeete waardes as 'n finale vlak van
bekragtiging. Die metodes wat gebruik word om die verskillende modelparameters te
bereken vergelyk goed met gemete waardes. Die nie-lineêre frekwensie-afhanklike verliese
van transformatorwindings word ook ondersoek en 'n metode om hierdie in ag te neem is
voorgestel en geïmplementeer. Die volledige voorgestelde modeleringsmetodiek in hierdie
tesis, wat die berekening van die modelparameters, modelsintese en oplosingsalgoritme
insluit word toegepas op 'n werklike gevallestudie. Die gevallestudie is uitgevoer op 'n
lugkern-reaktor wat 'n skyftipe-kragtransformatorwinding. Die reaktor word onderwerp aan
die standaard weerligimpuls golwe en die spanning al langs die winding word gemeet. Die
berekende en gemete spanning golf vorms word met mekaar vergelyk in beide die
frekwensie- en tyd-vlak. Uit die vergelyking blyk dit dat die model die werklike
oorgangspanningsweergawe van die toetseenheid akkuraat verteenwoordig vir die
frekwensie reeks van belang tydens standaard fabriekaanvaardingstoetse.
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Truxal, Luke W. "The Failed Bombing Offensive: A Reexamination Of The Combined Bomber Offensive In 1943." Thesis, University of North Texas, 2011. https://digital.library.unt.edu/ark:/67531/metadc103402/.
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For decades nations have debated how to successfully employ air power. In 1943 the United States and Great Britain launched a massive strategic bombing campaign against Germany. The two sides agreed to a flawed plan due to the fundamental differences on bombing doctrine. As a result, the campaign was fraught with issues that remained largely unresolved in 1943. Without a clearly defined plan, the Allies were unable to determine which commands or targets received priority throughout the offensive. This ultimately led to a confused and unfocused campaign. High losses and inconclusive results derailed the American bombing effort. By November, the two sides agreed that the entire bombing offensive was either behind schedule or had failed entirely.
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Tatum, Kenneth R. "A systems approach to understanding the strategic advantage of the F/A-22 and future stealth aircraft." CLICK HERE TO VIEW:, 2004. https://research.maxwell.af.mil/papers/ay2004/ari/tatum.pdf.
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Walbrecht, Donald Augustus. "The machinery of alliance : Anglo American air power diplomacy 1917-1965." Thesis, University of East Anglia, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251573.
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Many British and American critics have argued that the wartime 'Special Relationship' ended after World War H. Britain, buffeted by postwar shocks such as the end of Lend-Lease and atomic sharing, and by the lack of U. S. support during the Suez Crisis, felt increasingly demoted from its status as a great power, which had formerly been consulted by U. S. leaders on all matters of international importance. Despite those early post-war political dismissals, the USAF and the RAF began a Cold War linkage, which grew into a fifty-year association that was closer than any comparable defence relationship between nations. This work explores that unique relationship and argues that it grew even stronger through decades of mid-level air diplomacy clearly visible in the agreements and arrangements for U. S. Air Power in the United Kingdom. Its conclusions shed new light on the Anglo-American relationship and demonstrate the importance of air power in the diplomatic history of the two nations. It adds substance to the thin body of knowledge of air diplomacy, through an analysis of events, policies, agreements, arrangements, disagreements, and issues, which led to an even stronger transatlantic defence relationship that continues to serve both nations' interests
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Spaven, Paul F. "A US Air Force strategy for Africa /." Maxwell AFB, Ala. : School of Advanced Air and Space Studies, 2008. https://www.afresearch.org/skins/rims/display.aspx?moduleid=be0e99f3-fc56-4ccb-8dfe-670c0822a153&mode=user&action=downloadpaper&objectid=b150a2ed-53f8-4dfa-8521-41f9c1869e56&rs=PublishedSearch.
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Mohamed, Y. "Interactive analysis of power station cooling systems." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380600.
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Cruz, Yniol A. "CV or not to be? alternatives to U.S. sea-based air power." Thesis, Monterey, Calif. : Naval Postgraduate School, 2008. http://handle.dtic.mil/100.2/ADA483634.
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Thesis (M.S. in Defense Analysis)--Naval Postgraduate School, June 2008.<br>Thesis Advisor(s): Arguilla, John. "June 2008." Description based on title screen as viewed on August 25, 2008. Includes bibliographical references (p. 95-102). Also available in print.
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Gillespie, Thomas C. "Modeling the combat power potential of Marine Corps close air support." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1997. http://handle.dtic.mil/100.2/ADA336885.
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Thesis (M.S. in Operations Research) Naval Postgraduate School, Sept. 1997.<br>Thesis advisors, William G. Kemple, Wayne P. Hughes. Includes bibliographical references (p. 101-103). Also available online.
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Parsons, David Willard. "Toward the proper application of air power in low-intensity conflict." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA276734.
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Liu, Chun-Yi. "An improved rectenna for wireless power transmission for unmanned air vehicles." Thesis, Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/5561.
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Approved for public release; distribution is unlimited.<br>This thesis continues an NPS project related to wireless power transmission for micro air vehicles (MAVs). The conversion of radio-frequency (rf) power into usable direct-current (dc) power is performed by a rectifying antenna, or rectenna. The emphasis of this thesis is the simulation and experimental study of various rectenna designs to determine which best provides high efficiency, stable output power, and lightweight design. The analysis of rectenna design focuses on four subsystems: (1) the receiving antenna, (2) the matching sections, (3) the rectification, and (4) the post-rectification filter. Based on the findings of this research, the ultimate rectenna design implements a half-wave dipole antenna that performs full-wave rectification with two diodes. The post-rectification filter is implemented by a capacitor to obtain stable dc power. The final design achieved an efficiency of nearly 66% for input power in the range of 200 mW.
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Huang, Chung-Huan. "Design and Development of Wireless Power Transmission for Unmanned Air Vehicles." Thesis, Monterey, California. Naval Postgraduate School, 2012. http://hdl.handle.net/10945/17380.
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This thesis is an exploration of microwave wireless power transmission (WPT) for micro-air vehicles (MAVs). WPT, converting radio frequency (rf) power into usable direct current (dc) power, can be implemented with a rectifying antenna, or rectenna. The emphasis of this thesis is on the simulation of rectenna efficiency and measurement of experimental hardware. In this thesis, power reflection in the rectifier matching circuit was investigated by a series of simulations using Agilent Advanced Design System (ADS). Tuning elements were added and adjusted in order to optimize the efficiency. A maximum efficiency of 57 per cent was obtained at 10 gigahertz (GHz) with 200 mW input to the rectenna. A full-wave rectenna was built and hardware experiments were conducted to measure the efficiency of the WPT and characterize the behavior of the circuit. The design is optimized for an input power of 200 mW but, because of hardware limitations, only low-input power levels (about 1 mW) could be tested. A comparison of measurement and simulation results is given, and possible reasons for the differences are discussed.
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Honing, Werner. "Steam flow distribution in air-cooled condenser for power plant application." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/2540.
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Thesis (MScEng (Mechanical and Mechatronic Engineering))--University of Stellenbosch, 2009.<br>ENGLISH ABSTRACT: Air-cooled steam condensers are used in arid regions where adequate cooling water is not available or very expensive. In this thesis the effect of steam-side and air-side effects on the condenser performance, steam distribution and critical dephlegmator length is investigated for air-cooled steam condensers as found in power plants. Solutions are found so that no backflow is present in the condenser. Both single and two-row condensers are investigated.
The tube inlet loss coefficients have the largest impact on the critical dephlegmator tube length in both the single and two-row condensers. The critical dephlegmator tube lengths were determined for different dividing header inlet geometries and it was found that a step at the inlet to the dividing header resulted in the shortest tubes.
Different ambient conditions were found to affect the inlet steam temperature, the steam flow distribution, heat rejection distribution and the critical dephlegmator length for the single and two-row condensers. There were differences in the steam mass flow distributions for the single and two-row condensers with opposite trends being present in parts of the condenser. The single-row condenser’s critical dephlegmator tube lengths were shorter than those of the two-row condenser for the same ambient conditions. Areas of potential backflow change with different ambient conditions and also differ between a single and two-row condenser. The two-row condenser always have an area of potential backflow for the first row at the first condenser fan unit.<br>AFRIKAANSE OPSOMMING: Droë lug-verkoelde stoom kondensors word gebruik in droë gebiede waar genoegsame verkoelingswater nie beskikbaar is nie of baie duur is. In hierdie tesis word die effek van stoomkant en lugkant effekte op die vermoë van die kondensor, die stoomvloeiverdeling en kritiese deflegmator lengte ondersoek vir lug-verkoelde stoom kondensors soos gevind in kragstasies. Dit word opgelos sodat daar geen terugvloei in enige van die buise is nie. ʼn Enkel- en dubbelry kondensor word ondersoek.
Die inlaatverlieskoëffisiënte van die buise het die grootste impak op die lengte van die kritiese deflegmator buise in beide die enkel- en dubbelry kondensors. Die kritiese deflegmator buis lengtes is bereken vir verskillende verdeelingspyp inlaat geometrië en dit is gevind dat ʼn trap by die inlaat van die verdeelingspyp die kortste buise lewer.
Dit is gesien dat verskillende omgewingskondisies die inlaat stoom temperatuur, die stoomvloeiverdeling, die warmteoordrag verdeling en die kritiese lengte van die deflegmator buise vir die enkel- en dubbelry kondensor. Daar was verskille tussen die stoomvloeiverdelings vir die enkel- en dubbelry met teenoorgestelde neigings in dele van die kondensor. Die kritiese deflegmator buis lengte vir die enkelry kondensor was korter as die vir die dubbelry kondensor vir dieselfde omgewingskondisies. Die areas in die kondensor waar terugvloei moontlik kan plaasvind in die kondensor verander met ongewingskondisies en verskil vir die enkel- en dubbelry kondensers. Die dubbelry kondensor het altyd ʼn area van moontlike terugvloei vir die eerste buisry by die eerste kondensor waaiereenheid.
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Faulkenberry, Barbara J. ""Global Reach--Global Power" Air Force Strategic Vision, Past and Future /." Maxwell AFB, Ala. : Air University Research Coordinator Office, 1998. http://www.au.af.mil/au/database/research/ay1995/saas/faulkebj.htm.
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Thesis (M.M.A.S.)--School of Advanced Airpower Studies, 1995.<br>Subject: The analysis presented in this thesis evaluates the contents of past air force strategic vision documents and studies the process used to create such documents. Cover page date: June 1995. Vita. Includes bibliographical references.
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Kallel, Bilel. "Design of Inductive Power Transmission System for Low Power Application with Movable Receiver and Large Air Gap." Universitätsverlag Chemnitz, 2018. https://monarch.qucosa.de/id/qucosa%3A32975.
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Inductive power transmission is very useful, not only for systems where energy transfer should take place in hazardous, humid and wet areas, but also for mobile and very small systems. It finds today a widespread use in several fields, such as industry, automotive, medicine and smart buildings. For a good efficiency and a high-power transmission, the sending and the receiving coils should be perfectly aligned and close to each other. A misalignment between the sender and the receiver becomes unavoidable especially for systems with movable parts.
This thesis aims to improve the transmitted power, the mutual inductance, the power at the load, and consequently the power transmission efficiency in case of lateral misalignment between the sending and receiving coils and at large coil-to-coil distance. For this purpose, we adopt a multi input single output (MISO) coil system able to orientate the issued magnetic field to the receiving coil by powering the neighbouring sending coils of the active ones with a weak current in the opposite direction. Furthermore, an analytical model of the used coils and an accurate three-dimensional model of the system have been developed to calculate the induced voltage, the induced current, and the equivalent mutual inductance. Both simulation and experimental results prove that the proposed multi-coil inductive system having an hexagonal arrangement and the sending coils, which have the half diameter of the receiving coil, is able to improve significantly the transmitted power in case of lateral misalignment and big air gap. The novel MISO system reaches better efficiency beginning with an air gap of 50% of the sending coil diameter, and a misalignment of 28% of the sending coil diameter. It reaches the double of the transmitted power of the conventional two-coil inductive system at 50 mm air gap (corresponding to 166% of the sending coil diameter) and at 10 mm lateral misalignment (corresponding to 33% of the sending coil diameter).
In order to improve the equivalent mutual inductance between the primary and secondary sides and to avoid energy losses, we propose a receiver detection method using the sending coils themselves as detectors. Thereby, only the sending coils, under the receiver, are activated and the others remain switched off. For that, the peak of the AC current of the sending coils, is measured and then compared to a detection threshold. The excitation strategy of the active sending coils is optimized corresponding to the receiving coil position. The novel excitation strategy increases the mutual inductance by 85% and the induced voltage by 13% at perfect alignment and by 30% and 10% respectively at 10 mm lateral misalignment, in comparison to the MISO system without a receiver detector and coil-excitation strategy.
In order to increase the transmitted power by resonance, different system topologies have been investigated, such as series-series SS, series-parallel SP, parallel-series PS, and parallel-parallel PP topologies for different levels of load impedance. The results show that a multi-coil inductive system with parallel-parallel PP topology realizes a higher transmitted power than the other topologies for both high and low load impedance values.
The proposed multi-coil inductive system is suitable for low-power systems, such as wireless sensors and biomedical implants, but can be also applied to higher range of power at a flexible position of the receiver.<br>Die induktive Energieübertragung ist interessant, nicht nur für Systeme, bei denen die Energieübertragung in rauen, feuchten und nassen Bereichen erfolgen soll, sondern auch für mobile und sehr kleine Systeme. Diese Art von Energieübertragung findet heute eine breite Anwendung in verschiedenen Bereichen, wie z.B. Industrie, Automobil, Medizin und intelligente Gebäude. Um
eine gute Effizienz und eine hohe Energieübertragungsleistung zu realisieren, sollten die Sende- und Empfangsspulen perfekt ausgerichtet und nahe beieinander sein. Insbesondere bei Systemen mit beweglichen Teilen ist jedoch eine Fehlausrichtung zwischen Sender und Empfänger unvermeidlich.
Diese Arbeit zielt darauf ab, die übertragene Leistung, die gegenseitige Induktivität, die Leistung an der Last und damit den Wirkungsgrad der Leistungsübertragung im Falle einer seitlichen Fehlausrichtung zwischen Sende- und Empfangsspule und bei großem Abstand von Spule zu Spule zu verbessern. Zu diesem Zweck wird ein Multi-Input Single-Output (MISO)-Spulensystem vorgeschlagen, das in der Lage ist, das ausgegebene Magnetfeld auf die Empfangsspule auszurichten, indem die benachbarten Spulen der aktiven Sendespulen mit einem schwachen Strom in der entgegengesetzten Richtung versorgt wird. Darüber hinaus wurde ein analytisches Modell für die verwendeten Spulen und ein genaues dreidimensionales Modell für das System entwickelt, um die induzierte Spannung, den induzierten Strom und die äquivalente gegenseitige Induktivität zu berechnen. Sowohl die Simulation als auch die experimentellen Ergebnisse belegen, dass das vorgeschlagene induktive Mehrfachspulensystem mit hexagonaler Anordnung und die Sendespulen, die den halben Durchmesser der Empfangsspule haben, in der Lage sind, die Sendeleistung bei lateraler Fehlausrichtung und großem Luftspalt deutlich zu verbessern. Das neuartige MISO-System erreicht einen besseren Wirkungsgrad, beginnend mit einem Luftspalt von 50% des Sendespulendurchmessers und einer Fehlausrichtung von 28% des Sendespulendurchmessers. Sie erreicht bei 50 mm Luftspalt (entspricht 166% des Sendespulendurchmessers) und bei 10 mm seitlichem Versatz (entspricht 33% des Sendespulendurchmessers) das Doppelte der Sendeleistung des herkömmlichen Zwei-Spulen-Induktivsystems.
Um die äquivalente gegenseitige Induktivität zwischen Primär- und Sekundärseite zu verbessern und Energieverluste zu vermeiden, schlagen wir ein Verfahren zur Detektion des Empfängers vor, bei dem die Sendespulen selbst als Detektoren verwendet werden. Dabei werden nur die Sendespulen unter dem Empfänger aktiviert und die anderen bleiben ausgeschaltet. Dazu wird der Scheitelwert des Wechselstroms der Sendespulen gemessen und mit einem vorgegebenem Schwellenwert verglichen. Die Anregungsstrategie der aktiven Spulen wird entsprechend der Position der Empfangsspule optimiert. Die neuartige Anregungsstrategie erhöht die gegenseitige Induktivität um 85% und die induzierte Spannung um 13% bei perfekter Ausrichtung und um 30% bzw. 10% bei 10 mm seitlichem Versatz, im Vergleich zum MISO-System ohne Empfängerdetektor und Spulenanregungsstrategie.
Um die übertragene Leistung durch Resonanz zu erhöhen, wurden verschiedene Systemtopologien untersucht, wie z.B. Serien-SS, Serien-Parallel-SP, Parallel-Series-PS und Parallel-Parallel-PP-Topologien für verschiedene Stufen der Lastimpedanz. Die Ergebnisse zeigen, dass ein MISO System mit parallel-paralleler PP-Topologie eine höhere Sendeleistung realisiert als die anderen Topologien für hohe und niedrige Last-Impedanzen.
Das vorgeschlagene induktive Mehrspulensystem eignet sich für Systeme mit geringer Leistung, wie drahtlose Sensoren und biomedizinische Implantate, kann aber auch flexibler Position des Empfängers in einen höheren Leistungsbereich angewendet werden.
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Ji, Xiaoyan. "Thermodynamic properties of humid air and their application in advanced power generation cycles." Doctoral thesis, Stockholm : Department of Chemical and Engineering and Technology, Royal Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4129.
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Larson, Paul Harris. "The struggle for control of American military aviation." Diss., Kansas State University, 2016. http://hdl.handle.net/2097/34567.
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Doctor of Philosophy<br>Department of History<br>Donald J. Mrozek<br>The United States Army activated the Aeronautical Division, United States Signal Corps, on August 1, 1907. The men of the Aeronautical Division faced hardships and challenges from the very beginning as they tried to build the nation’s first air force prior to World War I. The U.S. Army, the War Department, Congress, and even the American people, really did not know what aircraft could do beyond simple flight. American airmen tried to demonstrate what air power was capable of, but the response to their achievements never met their expectations.
Using an abundance of primary and secondary sources on American air power, this dissertation demonstrates that airmen’s struggle for a separate service was not something that developed slowly over the course of decades. Instead, this dissertation shows that airmen wanted independence from the U.S. Army from the start. From their point of view, the U.S. Army, the War Department, and Congress never really appreciated or understood air power. As a result, airmen became more and more alienated with each passing year until they achieve want they wanted -- independence.
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Condron, Ewell D. "Cost Savings Realized Through Proper Sizing of an Excessive Instrument Air System." Thesis, University of North Texas, 2003. https://digital.library.unt.edu/ark:/67531/metadc4428/.
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The purpose of this research was to determine if installing a smaller air compressor could reduce the electrical usage of a large semiconductor manufacturing plant. A 200 horsepower Atlas Copco compressor was installed with the existing 500 horsepower Ingersoll-Rand compressors. Testing was conducted during the regular manufacturing process at MEMC Southwest in Sherman, Texas. Analysis of the data found that installing the new compressor could reduce electrical consumption. The study also found there are specific operational setpoints that allow the compressor to operate more efficiently.
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Fox, Murray Charles. "Disintegrative Power Structures in Australian Export Airfreight Chains." Thesis, Griffith University, 2011. http://hdl.handle.net/10072/366482.
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There is a perception in the air freight community that the Australian air freight industry operates in an uncoordinated, disintegrated way with third party logistics providers and others attempting to maximize revenues and profits (in effect, to appropriate maximum value) in a ‘cost plus’ working environment. The impression has been reinforced by traditional airlines who have focused their business model on an airport to airport basis, allowing, the recently established ‘integrators’ such as DHL, FedEx and others - effectively their competitors in express and other freights - the capability to offer their customers an integrated door-to-door service. In this respect, the integrators have structured and marketed themselves to operate in an end-to-end, fully integrated and controlled operating model. Some industry managers, having observed the continual downward spiral of air freight yields being achieved by traditional airlines, have attributed these falling yields to over-capacity in the supply side of the air freight markets. This thesis suggests, however, that this view is overly simplistic and that there are more complex factors at play. Particularly, it was much impressed and inspired by the relatively recent work of Andrew Cox and his associates at Birmingham University who have developed an important, relevant and realistic conceptual framework that focuses on the power relationships between individual firms in a chain (dyadic relationships) or between sets of chain players (power regimes) in supply chains; and on the ability of firms enjoying significant levels of power within the supply chain to appropriate above normal returns (or economic rents) and to exert dominance over firms with little or no power in the chain. In effect, Cox argued that the actions and business behaviour of individual firms in the supply chain could, and do, have a direct bearing on the efficiency of the chain as a whole entity. Robinson, following and modifying some aspects of the Cox framework was the first to apply Cox’s work to freight movement and the special role of third party service or logistics providers in chains and in particular, to ocean freight and maritime and port-related freight movements.<br>Thesis (PhD Doctorate)<br>Doctor of Philosophy (PhD)<br>School of Biomolecular and Physical Sciences<br>Science, Environment, Engineering and Technology<br>Full Text
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Costello, Peter A. "A Matter of Trust Close Air Support Apportionment and Allocation for Operational Level Effects /." Maxwell AFB, Ala. : Air University Research Coordinator Office, 1998. http://www.au.af.mil/au/database/research/ay1995/saas/costelpa.htm.
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Thesis (M.M.A.S.)--School of Advanced Airpower Studies, 1995.<br>Subject: Command and control and responsiveness of close air support. Cover page date: June 1995. Vita. Includes bibliographical references.
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Graber, Benjamin. "HIGH POWER TIME DOMAIN TERAHERTZ SPECTROSCOPY." Diss., Temple University Libraries, 2014. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/301211.
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Physics<br>Ph.D.<br>Terahertz (THz) has become a strong area for scientific research and commercial application in recent years. This research group has redesigned and optimized a THz photoconductive antenna, which currently operates with approximately 10x the power of a commercial antenna. It has been determined by this research that the THz signal emitted from a photoconductive antenna consists of coherent and incoherent signals. In addition to the improvement of the THz photoconductive antenna, I have optimized an electro optic THz detection system by characterizing the field dependency of an electro optic crystal, which enabled me to estimate the THz electric field strength. The high power THz source and optimized detection system were combined into a high power, high resolution time domain THz spectrometer. This spectrometer was used to conduct original measurements of the THz spectrum of water vapor, ionized air, and various chemical vapor including explosives. Most of these measurements were only possible with our improved THz spectrometer. In order to understand ionized air, an additional study was carried out to explore the ionization of several gases (e.g. N2, O2, Ar, CO2, and water vapor) which were ionized by radioactive isotopes. This unique study found that in addition to dose rate, the gamma energy of the radioactive isotopes and the sequential ionization levels of gases affect the equilibrium ion densities of these gases. This effect was especially pronounced for argon gas. The study of ion dynamics in gases has lead to the development of a prototype for stand-off detection and identification of radioactive isotopes. This prototype, despite being simple in design, can detect isotopes faster and more cheaply than a conventional gamma ray spectrometer. Throughout this thesis research I have successfully developed a high power, high resolution terahertz spectrometer and demonstrated that with the spectrometer I could identify characteristic resonances of water vapor, some chemicals including explosives, and even ionized air produced by nuclear isotopes. From the characteristic resonance frequencies one can understand the underlying physics or chemistry of molecules or atoms.<br>Temple University--Theses
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Helson, Peter History Australian Defence Force Academy UNSW. "The forgotten Air Force : the establishment and employment of Australian air power in the North-Western area, 1941-1945." Awarded by:University of New South Wales - Australian Defence Force Academy. School of History, 1997. http://handle.unsw.edu.au/1959.4/38719.
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The air campaign conducted by the RAAF in the North-Western Area during the Second World War has been largely ignored by historians yet it contributed significantly to the outcome of the Pacific war. This thesis sets out to discuss the campaign by considering various factors that impacted on the RAAF in the lead up to and during the course of the Pacific war and their relevance to the campaign. It looks at the way air operations were conducted in the North-Western Area between 1942 and 1945 and describes the role played by the flying squadrons based in the area. Using primary sources such as operational record books, documents and files at archives and libraries and interviews with veterans and experts the thesis found that the campaign was conducted in several phases. It started with the defence of Darwin. In keeping with overall allied strategy the RAAF then went on an offensive into what was then the Netherlands East Indies (NEI) using medium and heavy bombers and mine laying sea planes flying from bases in Australia???s north west. The NEI was vital to the Japanese war effort as a source of essential raw materials such as oil, timber, and rubber. To defend this part of their new empire the Japanese had amassed large military garrisons on the islands. The vessels used to transport troops and materials became the most important targets for the RAAF???s bomber squadrons. As General MacArthur???s forces advanced along the north coast of New Guinea the North-Western Area based units conducted raids into the NEI to deceive the Japanese into thinking an invasion would be launched from Darwin. As the New Guinea campaign gained momentum the RAAF???s task was to protect its western flank, to prevent the Japanese from moving troops and aircraft east to the Philippines. The thesis concludes the campaign was successful because Darwin was defended, it denied the Japanese vital materials for the conduct of the war and it kept hundreds of aircraft and tens of thousands of troops away from the allied advance.
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Evans, Christopher Robert. "Tactical air power in the Normandy campaign, the role of 83 group." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0013/MQ33804.pdf.
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Conway, Andrew Ian. "Allied air power and intelligence in the Mediterranean, June 1940-December 1943." Thesis, University of Canterbury. History, 1994. http://hdl.handle.net/10092/2092.
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Between 1939 and 1945, the development of air power as an independent weapon ushered in a new age of three-dimensional warfare. Air forces were recognised increasingly as having an integral part to play in military operations alongside the traditional armed services, armies and navies. However, in comparison the importance of intelligence in the conduct of World War II aerial operations has been, until only recently, sadly neglected. In part, this oversight was unavoidable because some sources (particularly Ultra) remained a closely-guarded secret until the mid-1970s; yet other sources simply were omitted, even though their existence was unconcealed. Yet it is arguable that without an appreciation of the contribution of intelligence, a proper understanding of these campaigns is impossible. This thesis aims to fill this gap by exploring the combination of air power and intelligence in a specific setting. The choice of the Mediterranean theatre during the period June 1940 to December 1943 is salient for two reasons. Firstly, it represents the formative years of the air arm, as it was employed in a variety of roles on a progressively expanding scale. Secondly, the Mediterranean conflict anticipated the utilisation of intelligence on a similarly widespread scale, in a diverse manner of forms and guises. The parallel paths followed by both of the embryonic services were to cross many times and ultimately become permanently intermeshed. Throughout this process, intelligence would gradually exercise a major influence on the planning and implementation of air operations, and even assist in the shaping of a revolutionary doctrine for Allied air power.
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Marsden, Ben. "Engineering science in Glasgow : W.J.M. Rankine and the motive power of air." Thesis, University of Kent, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303774.
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Benbow, Tim. "The impact of air power on navies : the United Kingdom, 1945-1957." Thesis, University of Oxford, 1999. http://ora.ox.ac.uk/objects/uuid:5be91b1c-cfe2-4ea5-80e9-37cb1328e0e0.
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This thesis examines how air power has affected navies using the case of the United Kingdom between 1945 and 1957. Air power has given rise to numerous theories about its effect on the use of force, in which its impact on navies has been a particular theme. Many thinkers have interpreted air power as a strategic, operational and tactical challenge to navies, which would render them redundant and obsolete. Such ideas originated between the two World Wars but have continually reappeared since 1945 and were often influential in the British debate. During the period under consideration, the Royal Navy was challenged in a series of defence reviews. Although these serious and repeated attacks were generally motivated by financial considerations, they were justified primarily by claims relating to air power. It was argued that nuclear-armed air power would be sufficient to win wars, while any nuclear war would leave little role for navies. Later, this argument shifted to an emphasis on deterrence of war and it was suggested that naval forces were not vital to this deterrent. Although the Admiralty continued to justify a capability to defend sea communications as both a deterrent to war and vital in it, this case did not find favour with the government. During the mid-1950s, however, an alternative focus for the Navy emerged in the form of policing and limited wars, east of Suez. Conflicts in Korea and the Suez demonstrated that such conflicts could occur and that mobile naval forces, particularly carrier aviation, were well suited to intervention in them. It was also argued that land-based aircraft could take over some of the roles traditionally performed by naval forces, notably that of strike (against warships and shore targets) but also that of protecting shipping. These arguments were successfully defeated by the Admiralty. Land-based aircraft proved a useful complement to warships and naval aviation in protecting shipping but could only replace them in very limited areas. The Royal Navy differed from the US Navy in its conception of power projection against the land. Its capability for this task was thrown increasingly into doubt by growing Soviet submarine and air power and came to be justified by east of Suez commitments.
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Mulholland, B. "A management system for seal positional control on power station air preheaters." Thesis, Queen's University Belfast, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335997.
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Ramsay, Lisa Frost. "Power and perception : a political ecology of air pollution in Umlazi and Lamontville, South Africa." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609022.
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George, K. V. "Source apportionment of particulate matter pollution around a pit head thermal power station." Thesis, IIT Delhi, 2016. http://localhost:8080/iit/handle/2074/7042.
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Amaya, Gonzalez Hernan Andres. "Power Consumption Analysis of Rotorcraft Environmental Control Systems." Thesis, Cranfield University, 2014. http://dspace.lib.cranfield.ac.uk/handle/1826/9231.
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Helicopters have now become an essential part for civil and military activities, for the next few years a significant increase in the use of this mean of transportation is expected. Unlike many fixed-wing aircraft, helicopters have no need to be pressurized due to their operating at low altitudes. The Environmental Control Systems (ECS) commonly used in fixed-wing aircraft are air cycle systems, which use the engine compressor’s bleed flow to function. These systems are integrated in the aircraft from inception. The ECS in helicopters is commonly added subsequently to an already designed airframe and power plant or as an additional development for modern aircraft. Helicopter engines are not designed to bleed air while producing their rated power, due to this a high penalty in fuel consumption is paid by such refitted systems. A detailed study of the different configurations of ECS for rotorcraft could reduce this penalty by determining the required power resulting from each of the system configurations, and therefore recommend the most appropriate one to be implemented for a particular flight path and aircraft.
This study presents the conducted analysis and subsequent simulation of the environmental control system in a selected representative rotorcraft: the Bell206L-4. This investigation seeks to optimize the rotorcraft’s power consumption and energy waste; by taking into consideration the cabin heat load. It consequently aims to minimize these penalties, achieving passenger comfort, an optimally moist air for equipment and a reduction in the environmental impact.
For the purpose of this analysis a civil aircraft was chosen for a rotary-wing type. This helicopter was analysed with different air-conditioning packs complying with the current airworthiness requirements. These systems were optimized with the inclusion of different environmental control models, and the cabin heat load model, which provided the best air-conditioning for many conditions and mission scopes, thus reducing the high fuel consumption in engines and hence the emission of gases into the environment. Each of the models was computed in the Matlab-simulink® software.
Different case studies were carried out by changing aircraft, the system’s configurations and flight parameters. Comparisons between the different systems and sub-systems were performed. The results of these simulations permitted the ECS configuration selection for optimal fuel consumption. Once validated the results obtained through this model were included in Rotorcraft Mission Energy Management Model (RMEM), a tool designed to predict the power requirements of helicopter systems.
The computed ECS model shows that favourable reductions in fuel burn may be achievable if an appropriated configuration of ECS is chosen for a light rotorcraft. The results show that the VCM mixed with engine bleed air is the best configuration for the chosen missions. However, this configuration can vary according to the mission and environment.