Relevant bibliographies by topics / Attica. Navy

Academic literature on the topic 'Attica. Navy'

Author: Grafiati
Published: 26 July 2024
Last updated: 27 July 2024

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Contents

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Attica. Navy.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Attica. Navy"

1

Fettig, Christopher J., Christopher P. Dabney, Stephen R. McKelvey, and Dezene P. W. Huber. "Nonhost Angiosperm Volatiles and Verbenone Protect Individual Ponderosa Pines from Attack by Western Pine Beetle and Red Turpentine Beetle (Coleoptera: Curculionidae, Scolytinae)." Western Journal of Applied Forestry 23, no. 1 (January 1, 2008): 40–45. http://dx.doi.org/10.1093/wjaf/23.1.40.

Full text
Abstract:
Abstract Nonhost angiosperm volatiles (NAV) and verbenone were tested for their ability to protect individual ponderosa pines, Pinus ponderosa Dougl. ex. Laws., from attack by western pine beetle (WPB), Dendroctonus brevicomis LeConte, and red turpentine beetle (RTB), Dendroctonus valens LeConte (Coleoptera: Curculionidae, Scolytinae). A combination of (−)-verbenone and eight NAVs [benzyl alcohol, benzaldehyde, guaiacol, nonanal, salicylaldehyde, (E)-2-hexenal, (E)-2-hexen-1-ol, and (Z)-2-hexen-1-ol] (NAVV) significantly reduced the density of WPB attacks and WPB successful attacks on attractant-baited trees. A significantly higher percentage of pitchouts (unsuccessful WPB attacks) occurred on NAVV-treated trees during two of three sample dates. In addition, significantly fewer RTB attacks were observed on NAVV-treated trees during all sampling dates. The application of NAVV to individual ponderosa pines significantly reduced tree mortality, with only 4 of 30 attractant-baited trees dying from bark beetle attack while 50% mortality (15/30) was observed in the untreated, baited control. To our knowledge, this is the first report establishing the effectiveness of NAVs and verbenone for protecting individual ponderosa pines from WPB attack.
APA, Harvard, Vancouver, ISO, and other styles
2

Dobrzyński, Paweł, Stanisław Lipski, Bogdan Machowski, Rafał Miętkiewicz, and Mariusz Krawczak. "Flying Means of Attack of Ships, Possible to Be Used by a Potential Enemy—Analysis of the Threats for Ships the Polish Navy." Zeszyty Naukowe Akademii Marynarki Wojennej 215, no. 4 (December 1, 2018): 117–42. http://dx.doi.org/10.2478/sjpna-2018-0030.

Full text
Abstract:
Abstract The article presents the analysis of the threats to Polish Navy ships resulting from the development by the Baltic Sea countries of missile systems or turbojet missiles. The most popular varieties and types of missiles that could be used against Polish Navy vessels were described and classified taking into account mainly the potential of the Baltic Fleet of the Russian Federation (BF FR), as well as an analysis of the latest global trends in the area of counteracting these missiles. The article presents the conclusions drawn from exemplary simulations of the attack of modern anti-ship missiles. The article also contains references to the ways of determining the probability of avoiding a rocket attack and the measure of the effectiveness of self-defence of attacked ships. The work contains conclusions regarding desirable traits from the systems of self-defence of ships on the modern battlefield with particular emphasis on the character of the Polish Navy. The article presents an analysis of the threats to ships of the Polish Navy, resulting from the development in the Baltic Sea countries, missile/turbojet anti-ship systems. Were described and classified most popular varieties and types of missiles applicable to fight Polish Navy ships and described latest global trends counteracted against these missiles. The article presents the conclusions drawn from exemplary simulations of the attack of modern anti-ship missiles. The article also contains references to the ways of determining the probability of avoiding a rocket attack and the measure of the effectiveness of self-defence of attacked ships. The work contains conclusions regarding desirable traits from the systems of self-defence of ships on the modern battlefield, with particular emphasis on the nature of the Polish Navy.
APA, Harvard, Vancouver, ISO, and other styles
3

_, _. "Nagy Attila professzor 70 éves." Magyar Sebészet (Hungarian Journal of Surgery) 69, no. 4 (December 2016): 201–2. http://dx.doi.org/10.1556/1046.69.2016.4.10.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Szentkeresztesy, Zsolt. "Nagy Attila Professzor Úr 75 éves." Magyar Sebészet 75, no. 1 (March 24, 2022): 75. http://dx.doi.org/10.1556/1046.2022.10015.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

McGregor, Steven. "American peacetime naval aviation and the Battle of Midway." Open Military Studies 2, no. 1 (January 1, 2022): 113–23. http://dx.doi.org/10.1515/openms-2022-0129.

Full text
Abstract:
Abstract There are many explanations for the victory of the United States against the Japanese at the Battle of Midway on June 4, 1942. Mistakes made by the Japanese certainly factored in the outcome and the United States also had certain advantages. However, an important if not sufficient explanation for the US victory is the pre-war preparation of the US Navy during peacetime. Designed by Ed Heinemann at Douglas Aircraft in El Segundo, California, from 1934 until 1938, the first Dauntless planes were delivered to the navy in 1940, well in advance of the Japanese attack on Pearl Harbor, the moment which is conventionally regarded as the US entry into the war. The pilots of the Dauntless, as I will show in this essay, were much the same; they too were the product of a peacetime Navy.
APA, Harvard, Vancouver, ISO, and other styles
6

Grillet, Pierre Antoine. "Special Classes of Semigroups, by Attila Nagy." Semigroup Forum 70, no. 1 (December 9, 2004): 156–58. http://dx.doi.org/10.1007/s00233-004-0149-6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Winter, Sandra, and Attila Nagy. "Komplexe Organisationen steuern." Sozialwirtschaft 32, no. 2 (2022): 24–25. http://dx.doi.org/10.5771/1613-0707-2022-2-24.

Full text
Abstract:
Erhöhte Transparenz- und Nachweispflichten für die operative Leistungserbringung und den Personaleinsatz an der unmittelbaren Kundenschnittstelle schränken die bisherigen Möglichkeiten für Querfinanzierungen von Overheadbereichen ein. Gefordert sind neue Wege in der Steuerung und Führung komplexer Organisationen der Sozialwirtschaft. Patentrezepte für die Neuorganisation gibt es nicht, jedoch typische Ansatzpunkte, meinen Sandra Winter und Attila Nagy von der rosenbaum nagy unternehmensberatung.
APA, Harvard, Vancouver, ISO, and other styles
8

Grieger, Thomas A., and John L. Lyszczarz. "Psychiatric Responses by the U.S. Navy to the Pentagon Attack." Military Medicine 167, suppl_4 (September 1, 2002): 24–25. http://dx.doi.org/10.1093/milmed/167.suppl_4.24.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Nagy, Attila, and Anne Huffziger. "Overhead-Kosten nachhaltig und rechtssicher finanzieren." Sozialwirtschaft 31, no. 6 (2021): 14–16. http://dx.doi.org/10.5771/1613-0707-2021-6-14.

Full text
Abstract:
Eine professionelle betriebswirtschaftliche und fachliche Steuerung aller Unternehmensbereiche ist heute in der Sozialwirtschaft unabdingbar, um rechtlichen Anforderungen lückenlos gerecht zu werden, Risiken zu vermeiden und ein gutes Leistungsangebot sicherzustellen. Dazu ist es erforderlich, ein optimiertes Gesamtsystem zu schaffen mit einer optimalen Aufgabenteilung zwischen zentralen und dezentralen Einheiten. Doch neue gesetzliche Bestimmungen erschweren die Refinanzierung der Overhead-Bereiche bei sozialen Leistungsanbietern weiter. Attila Nagy und Anne Huffziger von der rosenbaum nagy unternehmensberatung zeigen gangbare Wege aus dieser Zwickmühle auf.
APA, Harvard, Vancouver, ISO, and other styles
10

Niven, Bill. "The Good Captain and the Bad Captain: Joseph Vilsmaier's 'Die Gustloff' and the Erosion of Complexity." German Politics and Society 26, no. 4 (December 1, 2008): 82–98. http://dx.doi.org/10.3167/gps.2008.260405.

Full text
Abstract:
This article provides an interpretation of Josef Vilsmaier's two-part television feature film, Die Gustloff (2008), which depicts the sinking of that ship in January 1945. It argues that Vilsmaier, at the expense of historical fact, pins blame for the fateful decisions that led to the ship being vulnerable to attack on the Navy, while simultaneously seeking to exculpate and even glorify the Merchant Navy representatives on board. Die Gustloff seeks to distinguish between a “bad” captain and a “good” one, between hard-hearted military indifference and uncorrupted civilian decency in the face of the plight of German refugees. Generally, in its portrayal of the civilian as a realm untainted by Nazism, it seeks to resist trends in contemporary historiography that show such distinctions to be untenable. It is thus deeply revisionist in character, and, in many ways, represents the nadir of the “Germans as victims” trend in contemporary German culture.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Attica. Navy"

1

Hoblos, Jalaa. "Selfish Node Misbehaving Statistical Detection with Active MAC Layer NAV Attack in Wireless Networks}." [Kent, Ohio] : Kent State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=kent1164119272.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

CECCARELLI, STEFANO. "Commedia antica e campagna attica. I "Contadini" e le "Navi mercantili" di Aristofane." Doctoral thesis, 2019. http://hdl.handle.net/11573/1240114.

Full text
Abstract:
La presente tesi di dottorato presente l'edizione critica e il commento di due commedie frammentarie di Aristofane: i "Contadini" (Γεωργοί) e le "Navi Mercantili" (Ὁλκάδες). Queste due pièce sono accomunate dal topos letterario di una campagna idealizzata riscontrabile, in particolare, anche in "Acarnesi" e "Pace". L’introduzione generale affronta, da un punto di vista letterario, il tema della campagna e della sua idealizzazione nell’intera produzione teatrale attica (tragedia, commedia e dramma satiresco), prendendo in considerazione sia le opere conservate sia le frammentarie.
APA, Harvard, Vancouver, ISO, and other styles
3

Mansfield, Charles T. "Modern piracy the impact on maritime security." 2008. http://handle.dtic.mil/100.2/ADA490682.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Books on the topic "Attica. Navy"

1

George, Sullivan. Famous navy attack planes. New York: Dodd, Mead, 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Lising, Gary. Cory nary attack. Makati, Metro Manila: G. Lising, 1987.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Kinzey, Bert. Colorful U.S. Navy A-4 Skyhawks. Blue Ridge Summit, PA: Tab Books, 1990.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

David, Baker. Navy strike planes. Vero Beach, FL: Rourke Enterprises, 1989.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Balassa, Iván. Szabó T. Attila (1906-1987): Erdély nagy nyelvtudósa. Budapest: Püski, 1996.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Bandó, András Nagy. A 60 éves Nagy Bandó világa: Vincze Attila interjúkötete. Orfű: Szamárfül, 2007.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Thomason, Tommy H. Strike from the sea: Development of US Navy attack aircraft. North Branch, MN: Specialty Press, 2009.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

O'Rourke, Ronald. Navy seawolf and centurion attack submarine programs: Issues for Congress. [Washington, D.C.]: Congressional Research Service, Library of Congress, 1991.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Burgess, Richard R. US Navy A-1 Skyraider units of the Vietnam War. Oxford: New York, NY, 2009.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Burgess, Richard R. US Navy A-1 Skyraider units of the Vietnam War. Oxford: New York, NY, 2009.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Attica. Navy"

1

Sacks, David. "S." In A Dictionary of the Ancient Greek World, 209–38. Oxford University PressNew York, NY, 1997. http://dx.doi.org/10.1093/oso/9780195112061.003.0018.

Full text
Abstract:
Abstract Salamis (1) Inshore island in the northern Saronic Gulf, in central Greece. Salamis’ eastern side is separated from the coast of ATTICA by a curved channel less than a mile wide in the narrows, and it was there that the crucial sea battle of the PERSIAN WARS was fought in late summer of 480 B.c., after the invading army of the Persian king XERXES had overrun northern and central Greece. The allied Greek victory at Salamis broke the Persian navy and stopped the invasion, opening the way for the Greeks’ final land-victory, at PLATAEA, the following summer.
APA, Harvard, Vancouver, ISO, and other styles
2

Hay, James C. "The Attack Submarine." In The U.S. Navy, 215–43. Routledge, 2019. http://dx.doi.org/10.4324/9780429315565-15.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

"nav/attack, n." In Oxford English Dictionary. 3rd ed. Oxford University Press, 2023. http://dx.doi.org/10.1093/oed/3071985189.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Rahe, Paul A. "Introduction." In Sparta's First Attic War, 1–8. Yale University Press, 2019. http://dx.doi.org/10.12987/yale/9780300242614.003.0001.

Full text
Abstract:
This introductory chapter considers the implications of the aftermath of the Persian Wars. Prior to Sparta's defeat of the Persian army, there was every reason to suppose that the Greek resistance would collapse and that Hellas would soon fall. When the dust had settled, however, it gradually dawned on all concerned that affairs had undergone a decisive change; and everyone in and on the periphery of the Mediterranean world began to reassess. That such a turn of events could take place—that a ragtag navy and militia, supplied by tiny communities hitherto best known for their mutual hostility, should annihilate an armada greater than any the world had ever known—this was then and remains today both a wonder and an occasion for rumination. But this chapter shows that such an incredible outcome had its own issues. The unity displayed by the Hellenes during the war was unprecedented, after all. Whether or not this alliance would hold after the war, however, became a great cause for concern for those living in the postwar world.
APA, Harvard, Vancouver, ISO, and other styles
5

Seligmann, Matthew S. "Britain and Economic Warfare in German Naval Thinking in the Era of the Great War." In Economic Warfare and the Sea, 193–208. Liverpool University Press, 2020. http://dx.doi.org/10.3828/liverpool/9781789621594.003.0011.

Full text
Abstract:
Under the leadership of Alfred von Tirpitz, the German navy concentrated on building a battle fleet based in the North Sea rather than cruisers designed for operations in distant waters. This has led many historians to assume that commerce warfare (Handelskrieg) played no real part in German preparations for war against Britain before 1914. This chapter disputes this analysis. It shows that Germany’s naval planners in the Admiralstab believed that by converting merchant ships into auxiliary cruisers and using them to attack British commerce on the high seas the German navy would be able to cause considerable damage to British shipping and so force the Royal Navy to divert forces from the main theatre of war to distant oceans. It goes on to examine the reality of this plan during the First World War.
APA, Harvard, Vancouver, ISO, and other styles
6

"The British Attack on Rijeka, July 1813." In The British Navy, Rijeka and A.L. Adamic, 65–71. Archaeopress Publishing Ltd, 2005. http://dx.doi.org/10.2307/j.ctv2m7c5cp.14.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Casey, Steven. "Censorship at Sea." In The War Beat, Pacific, 45–66. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780190053635.003.0004.

Full text
Abstract:
In the first months of 1942, the navy exerted tight control over its war correspondents. While allowing them access to ships, it placed so many restrictions on what they could write about that a group of them, led by Robert Casey of the Chicago Daily News, began to complain vociferously. Stanley Johnston of the Chicago Tribune ultimately became the biggest troublemaker. After escaping from the USS Lexington before it sank during the Battle of the Coral Sea, Johnston used the slow journey home not only to write about this experience but also to learn that the navy had received advanced knowledge of the Japanese attack on Midway. His stories on both battles created a major sensation. With the navy convinced that the Tribune had divulged its secret codebreaking operation, the Roosevelt administration even made a failed bid to prosecute it under the Espionage Act.
APA, Harvard, Vancouver, ISO, and other styles
8

"Axis forces attack in the Balkans and Cyrenaica, February to April 1941." In The Royal Navy and the Mediterranean, 82–115. Routledge, 2013. http://dx.doi.org/10.4324/9780203045701-16.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

"Two. The Diary of a Navy Special-Attack Pilot." In Leaves from an Autumn of Emergencies, 51–80. University of Hawaii Press, 2017. http://dx.doi.org/10.1515/9780824840587-003.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Hunter, Mark C. "The US Navy and West Africa, 1843-1857." In Policing the Seas, 169–96. Liverpool University Press, 2008. http://dx.doi.org/10.5949/liverpool/9780973893465.003.0007.

Full text
Abstract:
This chapter analyses American naval policies concerning West Africa between 1843 and 1857, in contrast to the previous chapter concerning the Royal Navy. In particular it explores the US West African Squadron, noting the motivation to protect American commerce and resist British interference with US vessels. It paints a complex picture of the period, analysing the attack on Berriby; the Mexican-American War; the legal issues that plagued the US Army; the US Navy’s commercial goals; the American approach to the Slave Trade; and the dominance of the Royal Navy in the region. It draws the same conclusion as the previous chapter, namely that Britain and the US grew further mistrustful of one another due to their conflicting agendas regarding their commercial interests in West Africa.
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Attica. Navy"

1

Karafiath, Gabor, and Dan Lyons. "Hydrodynamic Performance with Pod Propulsion - US Navy Experience." In SNAME 25th American Towing Tank Conference. SNAME, 1998. http://dx.doi.org/10.5957/attc-1998-012.

Full text
Abstract:
The U.S. Navy has been interested in podded propulsion for over 20 years and has conducted model experiments on several designs in order to define their powering performance and other hydrodynamic characteristics. The model test drag data on several of these designs are analyzed and presented in terms of drag coefficient and pod residuary resistance. The model powering tests form a data base for estimating thrust deduction and wake fraction. Podded propulsion frees the designer from the constraints imposed by the traditional propeller support arrangements to offer advantages with regard to better hull design for lower resistance, improved propeller inflow, and more efficient propellers. Compared to the traditional design, some podded designs are predicted to reduce the delivered power at the propeller by as much as 20%. The design objectives, design constraints and reasons for improved performance are discussed for each of the podded designs that are presented.
APA, Harvard, Vancouver, ISO, and other styles
2

Coller, James A., Andrew Silver, Okey Nwogu, and Benjamin S. H. Connell. "Multiple Ship Motion Simulation Code Correlation with Model Test Results." In SNAME 30th American Towing Tank Conference. SNAME, 2017. http://dx.doi.org/10.5957/attc-2017-0015.

Full text
Abstract:
The US Nav has developed a real-time multi-ship ship motion forecasting system which combines forecast wave conditions with ship motion simulations to produce a prediction of the relative motions between two ships operating in a skin-to-skin configuration. The system utilizes two different simulation methods for predicting ship motions: MotionSim and Reduced Order Model (ROM) based on AEGIR. MotionSim is a fast three-dimensional panel method that is used to estimate the Response Amplitude Operators (RAOs) necessary for multi-ship motion predictions. The ROM works to maximize the accuracy of high fidelity ship motion prediction methods while maintaining the computational speed required for real-time forecasting. A model scale experiment was performed in 2015 on two Navy ships conventionally moored together. The predicted relative ship motions from MotionSim and ROM were compared to the model data using three different metrics: RMS (root mean square) ratio, correlation coefficient, and average angle measurement (AAM).This paper provides an overview of the two methods for predicting the multi-ship motions, a description of the model test, challenges faced during testing, and a discussion on the methodology of the evaluation and the results of each code correlation.
APA, Harvard, Vancouver, ISO, and other styles
3

Daley, Leonard T., and Torben Munk. "LM500 CODAG Propulsion for the Danish Navy Stanflex 300." In ASME 1987 International Gas Turbine Conference and Exhibition. American Society of Mechanical Engineers, 1987. http://dx.doi.org/10.1115/87-gt-244.

Full text
Abstract:
A description of the Royal Danish Navy’s answer to fleet modernization — a standard hull platform with multi-mission interchangeable modules designed to replace obsolescent classes of minelayer, mine sweeper, surveillance and missile attack craft. Propulsion for this ship will be provided by a triple screw combined diesel and gas turbine (CODAG) plant comprised of a General Electric Co. (USA) type LM500 marinized aeroderivative gas turbine and two (2) Motoren und Turbinen Union (MTU) 16V396 TB84 diesels. This is the first naval application of the General Electric Co. (USA) LM500 gas turbine.
APA, Harvard, Vancouver, ISO, and other styles
4

Karafiath, Gabor. "U. S. Navy Ship-Model Powering Correlation 1982 to 1995." In SNAME 24th American Towing Tank Conference. SNAME, 1995. http://dx.doi.org/10.5957/attc-1995-026.

Full text
Abstract:
The idea of an adjustment to model test procedures in order to improve ship powering predictions was initially introduced many years ago as a roughness allowance because it was recognized that the basic methodology involved in predicting power from model tests yields powering estimates for ships whose hulls are smooth. Thus an increment to the smooth ship resistance was added to account for the ships’ roughness and this increment was called the roughness allowance. Later on it was recognized that the difference between the predicted and measured power was due to roughness as well as other factors and the concept of a correlation allowance coefficient designated by the symbol CA was developed for engineering and design purposes in order to obtain the most accurate ship powering predictions. The value of the correlation allowance for a specific ship is determined from the analysis of ship and model powering data. The correlation allowances for specific ships forms a database or experience factor that helps guide the powering prediction for a proposed new design. In the years following WWII, the U.S. Navy ships still had riveted hull plating or a combination of riveted and welded plating and many ships used a hot plastic finish which resulted in a relatively rough ship hull. Paints with smoother finishes were just being introduced. Hadler et al [1] discussed the impact of paint type and construction method on CA and showed that in the 20 years leading up to 1960 there was a general decrease in the CA. It was common practice at the time to assume a constant value of CA equal to 0.0005 for all ship sizes. By the early 1980' s the common ship construction practice was an all welded ship with a relatively smooth paint finish such as the Navy Milspec vinyl. The Navy ship-model correlation data was reassessed and summarized by Hagen et al [2]. The earlier data with hot plastic 205 were purposefully disregarded and a correlation allowance instruction which is a function of ship length, see Fig. 1 , was issued by Naval Sea Systems Command (NAVSEA) [3] and defined for U.S. Navy powering predictions according to the standard David Taylor Model Basin (DTMB) powering prediction method documented by Grant and Wilson [4] . The primary purpose of this paper is to examine the ship-model correlation data gathered since the early 1980' s and to see if there is a need to modify the NAVSEA CA curve. Other purposes are to examine the accuracy of the RPM prediction using the David Taylor Powering Prediction method, and to discover if there are any ship or model characteristics in addition to length that could influence the selection of CA.
APA, Harvard, Vancouver, ISO, and other styles
5

Shifler, David A., and Donald Hoffman. "Upgrading Marine Engine Materials for Future Navy Ships." In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-01719.

Full text
Abstract:
Abstract U.S. Navy marine gas turbine engines serve as primarye and auxiliary power sources for several current classes of ships. Early observations noted in the 1960s and 1970s revealed severe corrosion attack on the first stage blade and vane components of a shipboard marine gas turbine engine that caused engine failure after only several hundred hours. In gas turbine development, there is always a drive and need to enhance the performance and life of engines. The virtues of using Ni-base superalloys in hot-section components has been well recognized and practiced as a means of substantial increase in turbine-inlet temperature, resulting in improvements in thermal efficiency, durability, and performance of engines. The USN shipboard environment (the marine environment) is high in salt laden air and water, coupled with air and fuel sulfur species that cause aggressive corrosion in gas turbine hot sections. Materials that can function in this environment are considered to be “Marinized”. Higher engine power density and pressure ratios for new engine designs will increase maximum blade, vane, and rotor metal temperatures from a mainly Low Temperature Hot Corrosion (LTHC) regime into both the High Temperature Hot Corrosion (HTHC) and Oxidation Corrosion regions. It is expected that future increased surface combatant loads and operational changes will require increased gas turbine operating temperatures and change the associated operating environment to one where Type I and Type II hot corrosion AND oxidation will be prevalent in newly anticipated operational profiles. The advanced gas turbine upgrade package will include better corrosion and oxidation resistant capability and/or higher temperature capable materials and their associated component overhaul methodologies. New materials need to be created and developed for use in more aggressive environments and higher temperature operations. The main cause of the shorter time between overhauls is the materials deterioration of the engine components associated with the hot section of the engine, e.g. turbine airfoils. The deterioration mechanisms are hot corrosion, with Type 1 hot corrosion mechanism becoming operative at the higher temperatures. The goal of this paper is to evaluate methods to enable running the engine at high power while getting back to the longer mean time between overhauls. The method to achieve the longer time is to evaluate and propose for implementation materials, which can withstand the higher temperatures and at the same time mitigate the operative corrosion mechanisms associated with marine environments.
APA, Harvard, Vancouver, ISO, and other styles
6

Löfdahl, Jan-Olof. "Cost Effective Maintenance of Gas Turbine Machinery in Swedish Navy Fast Surface Attack Ships." In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-148.

Full text
Abstract:
This paper is a summary of 35 years experience from maintenance, overhaul and repair of the ROLLS-ROYCE Marine PROTEUS Gas Turbine in the Swedish Navy. The 54 installed PROTEUS Gas Turbines in 18 ships have accumulated nearly 300 000 running hours. The reliability has steadily improved thanks to careful monitoring and intensive improvement programs. The initial, less than 500 hours average between engine removals has been extended to nearly 3000 hours as of today. Also the number of catastrophic engine failures has decreased. Although the Spare Parts prices and the Labor Costs per hour have increased over the years the maintenance cost per fired Gas Turbine hour has decreased. The paper describes the technical and economical aspects together with the cost reducing efforts. The information derives from the Swedish Navy Maintenance and Failure Reporting System, named “MARIS”, and from the VOLVO overhaul workshop annual technical and economical activity report.
APA, Harvard, Vancouver, ISO, and other styles
7

Cusanelli, Dominic S., and Kenneth Forgach. "Stern Flaps for Enhanced Powering Performance." In SNAME 24th American Towing Tank Conference. SNAME, 1995. http://dx.doi.org/10.5957/attc-1995-025.

Full text
Abstract:
The U.S. Navy has been investigating the potential for improved powering performance by the installation of stern flaps on many recent ship designs. Stern flaps have been retrofitted to two FFG-7 Class frigates and they will be featured on the new LPD-17 and D00-51 flight 2A ships. In addition, the Navy has fit PC-13 with a flap in order to demonstrate performance prior to the retrofit of the entire PC-1 class. Full scale trials on the PC-13 are presently being conducted. An intensive investigation is underway to quantify the energy savings with stern flaps on the DD-963 and CG-47 class ships. Numerous model tests have been performed to explore the benefits of stern flaps on larger, sealift type ships. The physical mechanisms that account for the improved performance due to a flap are discussed. Powering reductions on the order of 6 to 8 % at cruise and maximum speeds have been measured at model scale. Limited full scale trials indicate that the improvement due to the flap on the full scale ship is greater than the improvement measured at model scale. Results from twelve different model test programs are presented, including predictions of overall energy savings, increased maximum speed, and decreased power at cruise speed. General guidance for evaluating the potential benefit of a stern flap on a new design is provided.
APA, Harvard, Vancouver, ISO, and other styles
8

Löfdahl, Jan-Olof. "35 Years of Operation With Rolls-Royce Marine Proteus Gas Turbines in Swedish Navy Fast Surface Attack Ships." In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-147.

Full text
Abstract:
This paper covers 35 years of operation with the ROLLS-ROYCE Marine PROTEUS Gas Turbine in the Swedish Navy SPICA class Torpedo Boats and the NORRKÖPING class Missile Boats. 54 installed PROTEUS Gas Turbines in 18 boats have accumulated nearly 300 000 running hours. The service is intended to continue until year 2010. The paper describes: • Experience from operation. • Technical problems and their solutions. • Major modifications. • Life extension program. • Problem areas. • The future of the PROTEUS within Swedish Navy. The Swedish Navy operation of PROTEUS engines in fast surface attack ships is demanding and the environment is harsh. This causes great strain to the entire machinery. With the Gas Turbine Propulsion new Ship maneuvering technique had to be developed and adopted. Initial installation and engine problems had to be cured. Throughout the years several technical problems have turned up and been solved. The largest number or serious engine damages has been Power degradation and broken Compressor or burnt Turbine Blades and Vanes. Mainly as a result of a fouled Compressor, incorrect Bleed Valve setting or corrosion. Next largest engine problem has been vibration. In the early days engine related but nowadays generated by the installation or other equipment in the ship. All efforts laid down by involved personnel has greatly contributed to improve the reliability of the engine and its installation. New problems will certainly show up by age and changed operational procedures, thus calling for a continued improvement work. Spare parts accessibility will be the limiting factor for future PROTEUS operation. Therefore cooperation with ROLLS-ROYCE and the remaining operators in Spare Parts production and for exchange of Spare Parts is essential.
APA, Harvard, Vancouver, ISO, and other styles
9

Hayden, Dan D., John G. Hoyt, Mark Melendez, Herman J. Moeller, Yelena Bargman, Scott A. Carpenter, and Steven R. Turner. "Naval Surface Warfare Center’s Wavemaker Modernization Program." In SNAME 29th American Towing Tank Conference. SNAME, 2010. http://dx.doi.org/10.5957/attc-2010-016.

Full text
Abstract:
The driving technical requirements for new and modern replacements of the wave making systems at the Naval Surface Warfare Center, Carderock Division (NSWCCD) are discussed. Added capabilities of these new systems are presented with respect to both current and future United States Navy and Marine Corps requirements in terms of seakeeping, dynamic stability, wave-induced loads, and ride quality. The case is made that it is now time for the United States Navy to upgrade its testing capabilities in order to meet the more demanding operational requirements foreseen for future ships. Added capability includes both Operational and Technical. It is necessary to maintain the current costs of maintenance and operation while improving the availability and reducing the time required to create new test wave profiles. By going from the current pneumatic to a segmented type flap wavemaker, it has been demonstrated that these operational goals will be met. Added wave modeling capability is driven by more limited Naval resources projected to be available in the future - requiring both man and machine to do more for longer periods of time and in more severe sea conditions. The impact of this is already being seen in the model testing currently performed, with increased emphasis being placed on dynamic stability. In order to meet the future needs to evaluate seakeeping, including dynamic stability, wave-induced loads and ride quality new wave making capabilities are required. These capabilities include modeling of the directionality of the waves, having the ability to reproduce and encounter discrete wave events in a deterministic way, and improving upon the control and quality of the generated wave profiles.
APA, Harvard, Vancouver, ISO, and other styles
10

Riffel, R. E., and T. F. McKain. "Derivative T406 Based Turbofans for Advanced Trainers." In ASME 1990 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1990. http://dx.doi.org/10.1115/90-gt-243.

Full text
Abstract:
A need exists to modernize undergraduate pilot training procedures and resources to better address the emergence of new fighter/attack bomber and transport aircraft such as the ATF, A-12, B-1, B-2, C-17 and ATT. The current U.S. training resources consist of the T-37/T-38 aircraft for the Air Force and the T-45, which will replace the T-2C and the TA-4J, in the U.S. Navy pilot training program. The T-37 and T-38 aircraft are of the 1950s-1960s vintage and do not have the flying qualities, sustained G and Mach capability, and cockpit technologies consistent with now-emerging fighter/attack aircraft. The disparity in aircraft agility between today’s (and tomorrow’s) front line aircraft and trainers is illustrated in Fig. 1.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Attica. Navy"

1

Sternberg, C. A., Ricardo Traven, and James Lackey. Navy and the HARV: High Angle of Attack Tactical Utility Issues. Fort Belvoir, VA: Defense Technical Information Center, March 1994. http://dx.doi.org/10.21236/ada284128.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Somers, David W. Operational Considerations in Developing Command and Control Doctrine for Future Surface Navy Land Attack Weapons. Fort Belvoir, VA: Defense Technical Information Center, February 2001. http://dx.doi.org/10.21236/ada389626.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Attica. Navy' for particular source types:
Journal articles Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography