Academic literature on the topic 'Viet Nam Air Force'
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Journal articles on the topic "Viet Nam Air Force"
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Mathews, T. P. "Aeromedical Transport of the Seriously Ill Patient." Journal of the World Association for Emergency and Disaster Medicine 1, no. 2 (1985): 155–57. http://dx.doi.org/10.1017/s1049023x00065390.
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Most of us are aware of the medical airlifts that were practiced by the United States Air Force during the Korean and Viet Nam conflicts. Likewise, we read regularly of the air transport of one or more severely burned patients from the scene of an accident to the Burn Center at Brooke Army Medical Center in San Antonio, Texas. But what is not generally known is the daily movement of patients who are armed forces members, or their dependents, throughout the world for the purpose of receiving sophisticated medical care, regardless of where they may be stationed.The reasons for this service are two: first, quite obviously, it is humanitarian; second, it is a way for the Air Force to maintain medical readiness for their wartime mission by exercising this system on a daily basis during peacetime. We are talking about a worldwide network whose major and minor branches sweep around the globe.Patients are air transported according to three levels of need: routine, high priority, and urgent. This article will be limited to a general description of the necessary hardware and current practices used for the urgent mission.We use three types of aircraft: the Huey helicopter for short distances; the C-9, a two-engined jet, for medium range; and the C-141, a four-engined jet, for intercontinental transport. The medical modifications to the C-9 include a built-in ramp; a nurses' station similar to that found on a hospital ward, complete with built-in drug and equipment cabinets; multiple sources for oxygen and suction; and ready communication fore and aft. Seats can be quickly removed, leaving space for litters in tiers, infant isolettes and Stryker frames.
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Tran, T. N., N. B. Tran, H. M. T. Tran, H. K. Tang, X. M. Ngo, I. Godin, O. Michel, and C. Bouland. "Influence of type of dwelling on the prevalence of chronic respiratory diseases in Ho Chi Minh City, Viet Nam." International Journal of Tuberculosis and Lung Disease 24, no. 3 (March 1, 2020): 316–20. http://dx.doi.org/10.5588/ijtld.19.0043.
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SETTING and OBJECTIVE: Exposure to pollutants is related to the type of dwelling inhabited. Besides tobacco smoke, indoor air pollution is a significant risk factor for chronic respiratory disease (CRD). The prevalence of CRD by type of dwelling was studied in Ho Chi Minh City, Viet Nam.DESIGN: A total of 1561 people living in four type of dwellings were enrolled. Information on respiratory health, lung function, dwelling characteristics and sources of indoor pollution was obtained using a symptom and demographics questionnaire and spirometry. The two main respiratory health outcomes were clinical chronic CRD (CCRD) and chronic obstructive respiratory disease (CORD) (forced expiratory volume in 1 sec/forced vital capacity <0.7). We used binary logistic regression adjusted for age, sex, time spent at home, smoking status, certain occupational exposures, previous tuberculosis, presence of pets, rats or cockroaches at home, wall dampness, biofuel use and use of airconditioning.RESULTS: The prevalence of CCRD (24.3%) and CORD (5.3%) in the type of dwellings studied were not similar (χ2 P < 0.0001). CCRD and CORD prevalence was similar in tube houses and apartments. Compared to people living in apartments, those living in rental single rooms had a 46% higher risk of developing CCRD. The odds ratio of having CORD in people living in rental single rooms and in rural houses were respectively 4.64 (95%CI 1.97–10.5) and 2.99 (95%CI 1.21–7.37).CONCLUSION: Type of dwelling was associated with CCRD and CORD morbidity.
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Vuong, Thanh H. "Stratégies technico-commerciales asiatiques." Études internationales 22, no. 3 (April 12, 2005): 551–75. http://dx.doi.org/10.7202/702879ar.
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John Foster Dulles, then Secretary of State under the presidency of Eisenhower, once said there are two ways to conquer: by the clash of arms or through the economic control. The motto of the former WWII British SBS Commandos (Special Boat Service)used to be "United we conquer" and the one from the SAS (Special Air Service) used to be "Who dare win ", both of these commando troops or irregulars were in tactical competition framed by strategic cooperation where the light forces overcame heavier and overnumbering forces. Unity and daringness seem to be their secret weapon, but neither so secret nor so exclusive, comparatively to the recipe of tactical competition framed by strategic co-operation and coordination. "Superior numbers on the battlefield are an undoubted advantage, but skill, better organization, and training, and above all a firmer determination in all ranks to conquer at any cost, are the chief factors of success. Half-hearted measures never attain success in war and lack of determination is the most fruitful source of defeat" wrote Anthony Wilden1. The Chinese "Chii" (close to the latin "anima": heart, mind, courage) may be translated to "determination" and not by "energy" as it uses to be with the western obsession and compulsion of matter, energy and big power at the expense of high determination or "Tai Chi". The Chinese "Lii" - though its primal senses are "Law", "Rationality" and "Reason", "Rite" and "Harmony" - may be viewed as "Skill". Here, Asia is the Far East and mainly Japan, the "mother tiger" and her "baby tigers ", namely Korea (South), Hong Kong, Singapore and Taiwan. The ride of the dragon is oriented elsewhere and devastated Viet Nam (the smaller dragon) - by its independence wars and communist insulation and isolation - is not yet in the game. Strategy is both an organizational level of action and a type of action based on disguise, deception, uncertainty, flexibility and adaptation.
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Huy, Duong Huu. "AEROSOL pH IN HO CHI MINH CITY, VIET NAM." Vietnam Journal of Science and Technology 55, no. 4C (March 24, 2018): 72. http://dx.doi.org/10.15625/2525-2518/55/4c/12132.
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Aerosol pH is an important parameter that affects air quality, and the health of aquatic and terrestrial ecosystems. However, the lack of such data was reported in Ho Chi Minh City (HCMC), Vietnam. In this study, we estimated the aerosol pH in fine particulate matter (PM2.5) collected in HCMC, Vietnam using the thermodynamic equilibrium models (E-AIM Extended Aerosol Inorganics Model and ISORROPIA-II), and the phase partitioning of ammonia. Aerosol pHs estimated by different methods were 1.7 – 2.9. Good correlations between the phase-partitioning approach and models in predicting the aerosol pH were observed with R2 from 0.77 to 0.89, suggesting that the assumption of equilibrium is valid at the HCMC site.
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Hue, Pham Thi. "ENERGY CONSUMPTION AND AIR EMISSION INVENTORY FOR TRANSPORTATION SECTORS OF VIET NAM." Vietnam Journal of Science and Technology 56, no. 2C (August 29, 2018): 30–35. http://dx.doi.org/10.15625/2525-2518/56/2c/13026.
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Aiming to clarify the environmental impact caused by transportation activities in sectors of Vietnam, this study uses the Input-Output (IO) model to assess energy consumptions and air emissions from railway, road traffic, waterway, transport service as well as aviation vehicles in 2016. The data is based on the 2012 IO table updated for 2016. All sectors of the original IO table are aggregated into 38 sectors where the transport service sectors are kept intact for the deeper analysis. The energy consumptions of transport activities are determined based on the net contribution rate of fuels to each product/service sector and the calorific value of each fuel type. Then multiplying with the corresponding emission factors of CO2, NOx and SO2, the respective emissions from above sectors are calculated. The results show the contribution of transport activities in total emissions of each product/service sector and compare these numbers among all the sectors. Additionally, the study evidences that among transportation service sectors, the road traffic occupies the highest rate in term of energy consumptions and air emissions as well.
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Nguyen, Bao The, Tue Duy Nguyen, and Tuan Huy Dao. "Feasibility study of domestic cooling storage balls to reduce the energy cost of central air conditioning system." Science and Technology Development Journal 16, no. 2 (June 30, 2013): 73–81. http://dx.doi.org/10.32508/stdj.v16i2.1518.
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Although cooling storage system used broadly in the world, it is rarely applied in Viet Nam due to their high import expense that increase the initial cost. For that reason, in this article, we study on theories, and experiments about cooling storage sphere with expect to create the base for populising it in our country. That will contribute the efficiency of energy using to our country.
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Hung, Pham Ngoc, Pham Van Chung, and Le Thi Thanh An. "Multilevel multinomial logit model to study individual migration decision in Viet Nam." Science & Technology Development Journal - Economics - Law and Management 3, no. 1 (May 27, 2019): 45–51. http://dx.doi.org/10.32508/stdjelm.v3i1.539.
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In this paper we study the impact of relevant factors, such as individual characteristics, wages, living areas, on individual migration decisions. We have been using data from Labor Force Survey 2014 from Genaral Statistics Office of Vietnam (LFS 2014). We are going to evaluate how these above factors affect the status of "short-term migration" and "long-term migration" compared to "nonmigration". The well-known model in this field is the multinomial logistic model. However, the multinomial logistic model does not control the latent factors that have different effects on migration decision. This would result that the estimated coefficients of the variables would no longer be reliable (biased estimates due to lack of important variables). Hence, we have selected a multilevel multinomial logistic model. The levels we choose to control latent factors are province and region levels. As the results, the potential factors of different provinces and regions show different impacts on migration decisions. To sum up, a multilevel multinomial logistic model gives more reliable estimates, so it is more suitable for migration analysis compared to conventional multinomial logistic model.
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Vo, Khanh Mai. "2084581 Acoustic Radiation Force Impulse Imaging of Thyroid Nodules at Medic Medical Center, Viet Nam." Ultrasound in Medicine & Biology 41, no. 4 (April 2015): S133. http://dx.doi.org/10.1016/j.ultrasmedbio.2014.12.520.
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Thuy, N. M., L. T. Hang, T. L. Triep, N. D. Tan, and N. V. Tai. "Development and nutritional analysis of healthy chicken soup supplemented with vegetables in Viet Nam." Food Research 4, no. 1 (August 22, 2019): 113–20. http://dx.doi.org/10.26656/fr.2017.4(1).248.
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The present study was undertaken to formulate nutritious soup mix from chicken and locally available vegetables in Viet Nam. The drying was done by using a cabinet dryer (for vegetables) at a constant air flow rate and temperature or freeze-drier (for chicken) at varying times. The studies were carried out by mixing ingredients into 4 formulas. The chemical and physical characteristics of the product were analysed. The total energy, energy balance in terms of the major sources of energy, i.e. carbohydrate, protein and fat were calculated. In addition, the percentage of daily value (% DV) was calculated and the Nutrition facts of soup were established. Among various recipes, the mixed soup containing 9.2% freeze-dried chicken, 23.7% full cream powder, 28.8% potato starch, 19.8% of vegetables powder (which include 3.2% pumpkin, 3.8% tomato, 3.8% carrot, 9% potato), 2.4% seaweed, 11.4% seasoning and 2.8% sugar was the best among the four mixtures evaluated. During the storage period of 5 months, the moisture content, water activity and color of the dried soup mixture have changed but not significantly. The total colony forming units of soup mix (CFU/g) was below the recommended level (Vietnamese Standard - QCVN 11-4:2012/BYT).
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Hung, Mac Duy. "APPLICATION OF MACHINE LEARNING TO FILL IN THE MISSING MONITORING DATA OF AIR QUALITY." Vietnam Journal of Science and Technology 56, no. 2C (August 29, 2018): 104–10. http://dx.doi.org/10.15625/2525-2518/56/2c/13036.
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In this paper, three machine learning models have been applied to predict and fill in the missing monitoring data of air quality for Gia Lam and Nha Trang stations in Hanoi and Khanh Hoa respectively, including Autoregressive Moving Average (ARMA), Artificial Neural Network (ANN), and Support Vector Regression (SVR). Two air pollutants being NO2 and PM10 were selected for this study. The experimental results showed that the performance of all three studied models is better than that of some traditional approaches, including Multiple Linear Regression (LR) and Spline interpolation. Besides that, ARMA, ANN and SVR can capture the fluctuation of concentrations of the selected pollutants. These results indicated that the machine learning is a feasible approach to deal with the missing of data which is one of the biggest problems of air quality monitoring stations in Viet Nam.
Dissertations / Theses on the topic "Viet Nam Air Force"
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Nguyen, Triet M. ""Little Consideration... to Preparing Vietnamese Forces for Counterinsurgency Warfare"? History, Organization, Training, and Combat Capability of the RVNAF, 1955-1963." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23126.
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This dissertation is a focused analysis of the origins, organization, training, politics, and combat capability of the Army of the Republic of Viet Nam (ARVN) from 1954 to 1963, the leading military instrument in the national counterinsurgency plan of the government of the Republic of Viet Nam (RVN). Other military and paramilitary forces that complemented the army in the ground war included the Viet Nam Marine Corps (VNMC), the Civil Guard (CG), the Self-Defense Corps (SDC) and the Civil Irregular Defense Groups (CIDG) which was composed mainly of the indigenous populations in the Central Highlands of South Vietnam. At sea and in the air, the Viet Nam Air Force (VNAF) and the Viet Nam Navy (VNN) provided additional layers of tactical, strategic and logistical support to the military and paramilitary forces. Together, these forces formed the Republic of Viet Nam Armed Forces (RVNAF) designed to counter the communist insurgency plaguing the RVN. This thesis argues the following. First, the origin of the ARVN was rooted in the French Indochina War (1946-1954). Second, the ARVN was an amalgamation of political and military forces born from a revolution that encompassed three overlapping wars: a war of independence between the Vietnamese and the French; a civil war between the Vietnamese of diverse social and political backgrounds; and a proxy war as global superpowers and regional powers backed their own Vietnamese allies who, in turn, exploited their foreign supporters for their own purposes. Lastly, the ARVN failed not because it was organized, equipped, and trained for conventional instead of counterinsurgency warfare. Rather, it failed to assess, adjust, and adapt its strategy and tactics quickly enough to meet the war’s changing circumstances. The ARVN’s slowness to react resulted from its own institutional weaknesses, military and political problems that were beyond its control, and the powerful and dangerous enemies it faced. The People’s Army of Viet Nam (PAVN) and the People’s Liberation Armed Forces (PLAF) were formidable adversaries. Not duplicated in any other post-colonial Third World country and led by an experienced and politically tested leadership, the Democratic Republic of Viet Nam (DRVN) and the National Front for the Liberation of Southern Viet Nam (NFLSVN) exploited RVN failures effectively. Hypothetically, there was no guarantee that had the US dispatched land forces into Cambodia and Laos or invaded North Vietnam that the DRVN and NFLSVN would have quit attacking the RVN. The French Far East Expeditionary Corps (FFEEC)’ occupation of the Red River Delta did not bring peace to Cochinchina, only a military stalemate between it and the Vietnamese Liberation Army (VLA). Worse yet, a US invasion potentially would have unnerved the People’s Republic of China (PRC) which might have sent the PLAF to fight the US in Vietnam as it had in Korea. Inevitably, such unilateral military action would certainly provoke fierce criticism and opposition amongst the American public at home and allies abroad. At best, the war’s expansion might have bought a little more time for the RVN but it could never guarantee South Vietnam’s survival. Ultimately, RVN’s seemingly endless political, military, and social problems had to be resolved by South Vietnam’s political leaders, military commanders, and people but only in the absence of constant PAVN and PLAF attempts to destroy whatever minimal progress RVN made politically, militarily, and socially. The RVN was plagued by many problems and the DRVN and NFLSVN, unquestionably, were amongst those problems.
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Pham, Van Toan, Thi Phuong Nguyen, and Thanh Giao Nguyen. "Indoor air quality and health risk assessment for workers in packaging production factory, Can Tho city, Viet Nam." Technische Universität Dresden, 2018. https://tud.qucosa.de/id/qucosa%3A33338.
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The production of packaging goods for cement is one of the most important industries, contributing to income of many workers. Production activities, however, cause air pollution and health risk. The study was conducted to assess air quality and health risks of workers through air quality data and interviewing employees from 2016-2017 at a packaging production factory, Can Tho city, Vietnam. The findings indicated that temperature and noise exceeded the national technical regulations (QCVN 22-26: 2016/TT-BYT) while the humidity, wind speed, light, respirable particles, toxic gases (benzene, toluene, methyl ethyl ketone (MEK)) were in accordance with the national standards for occupational health and safety (Decision 3733/2002/QĐ-BYT). However, health risk assessment showed that long-term exposure in this factory would result in severe impact on health of workers due to indoor air pollution. The non-cancer risk caused by benzene, toluene and MEK for workers in the working sections such as printing, film coating, weaving, spinning and pasting was expected to cause serious impact on workers’ health. The cancer risk (benzene) index was in the range of 1.3 x 10-5 to 7.7 x 10-4 and averaged at 3.3 x 10-4. The study clearly showed that benzene greatly contributes to serious workers’ health effects. Appropriate protection measures such as treatment of air pollutants, regular health check, wearing protective clothes should be implemented to mitigate impact of indoor air pollution at the factory. More importantly, it is necessary to reconsider the standard values of benzene, toluene, methyl ethyl ketone to ensure health of workers.Công nghiệp sản xuất bao bì xi măng thuộc lĩnh vực ngành xây dựng là một trong những ngành công nghiệp quan trọng, đã góp phần mang lại nguồn thu nhập cho nhiều người lao động. Tuy nhiên hoạt động sản xuất cũng gây ra những vấn đề về ô nhiễm môi trường không khí và rủi ro sức khỏe. Nghiên cứu được thực hiện nhằm đánh giá mức độ ô nhiễm môi trường không khí và đánh giá rủi ro sức khỏe của công nhân thông qua số liệu chất lượng môi trường không khí và phỏng vấn trực tiếp người lao động trong khoảng thời gian từ 2016 - 2017. Kết quả nghiên cứu cho thấy nhiệt độ, tiếng ồn vượt qui chuẩn cho phép (QCVN 22-26:2016/TT-BYT) trong khi độ ẩm, tốc độ gió, ánh sáng, bụi hô hấp, hơi khí độc (Benzen, toluen, methyl ethyl ketone) đạt chuẩn cho phép theo tiêu chuẩn vệ sinh an toàn lao động (QĐ 3733/2002/QĐ-BYT). Tuy nhiên, kết quả đánh giá rủi ro sức khỏe cho thấy công nhân làm việc lâu dài sẽ bị ảnh hưởng nghiêm trọng đến sức khỏe do ô nhiễm không khí. Rủi ro không gây ung thư do benzene, toluene và MEK gây ra đối với công nhân ở từng khu vực có thể gây ảnh hưởng nghiêm trọng đến sức khỏe công nhân làm việc ở các khu vực sản xuất như in, tráng màng, dệt, kéo sợi và dán. Benzene gây rủi ro ung thư với xác suất từ 1 đến 7 người trong 10.000 người trong quá trình làm việc lâu dài tại nhà máy. Nghiên cứu cho thấy benzene đóng góp rất lớn vào khả năng gây ảnh hưởng nghiêm trọng đến sức khỏe công nhân. Môi trường không khí bên trong nhà máy cần được cải thiện hơn nữa đồng thời tuyên truyền nâng cao ý thức công nhân thực hiện nghiêm túc bảo hộ lao động, tổ chức khám sức khỏe định kỳ cho công nhân. Quan trọng hơn là cần điều chỉnh lại các giá trị qui chuẩn để đảm bảo an toàn sức khỏe cho công nhân đang làm việc tại những nơi có sự hiện diện của khí độc như benzene, toluen, methyl ethyl ketone.
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Weber, Nathaniel R. "The United States Military Assistance Advisory Group in French Indochina, 1950-1956." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8874.
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This thesis examines the American Military Assistance Advisory Group (MAAG) sent to French Indochina, from 1950 to 1956, when the United States provided major monetary and material aid to the French in their war against the communist Viet Minh. MAAG observed French units in the field and monitored the flow of American materiel into the region. Relying upon primary research in the National Archives, the thesis departs from previous interpretations by showing that MAAG held generally positive assessments of France‟s performance in Indochina. The thesis also argues that MAAG personnel were more interested in getting material support to the French, than in how that material was used, to the point of making unrealistic assessments of French combat abilities. By connecting primary research with the greater history of Cold War American military assistance, the thesis contributes to the scholarship on American involvement in Vietnam.
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Hawkins, John Michael. "The Limits of Fire Support: American Finances and Firepower Restraint during the Vietnam War." Thesis, 2013. http://hdl.handle.net/1969.1/151185.
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Excessive unobserved firepower expenditures by Allied forces during the Vietnam War defied the traditional counterinsurgency principle that population protection should be valued more than destruction of the enemy. Many historians have pointed to this discontinuity in their arguments, but none have examined the available firepower records in detail. This study compiles and analyzes available, artillery-related U.S. and Allied archival records to test historical assertions about the balance between conventional and counterinsurgent military strategy as it changed over time.
It finds that, between 1965 and 1970, the commanders of the U.S. Military Assistance Command, Vietnam (MACV), Generals William Westmoreland and Creighton Abrams, shared significant continuity of strategic and tactical thought. Both commanders tolerated U.S. Army, Marine Corps, and Allied unobserved firepower at levels inappropriate for counterinsurgency and both reduced Army harassment and interdiction fire (H&I) as a response to increasing budgetary pressure. Before 1968, the Army expended nearly 40 percent of artillery ammunition as H&I – a form of unobserved fire that sought merely to hinder enemy movement and to lower enemy morale, rather than to inflict any appreciable enemy casualties. To save money, Westmoreland reduced H&I, or “interdiction” after a semantic name change in February 1968, to just over 29 percent of ammunition expended in July 1968, the first full month of Abrams’ command. Abrams likewise pursued dollar savings with his “Five-by-Five Plan” of August 1968 that reduced Army artillery interdiction expenditures to nearly ten percent of ammunition by January 1969. Yet Abrams allowed Army interdiction to stabilize near this level until early 1970, when recurring financial pressure prompted him to virtually eliminate the practice. Meanwhile, Marines fired H&I at historically high rates into the final months of 1970 and Australian “Harassing Fire” surpassed Army and Marine Corps totals during the same period. South Vietnamese artillery also fired high rates of H&I, but Filipino and Thai artillery eschewed H&I in quiet areas of operation and Republic of Korea [ROK] forces abandoned H&I in late 1968 as a direct response to MACV’s budgetary pressure. Financial pressure, rather than strategic change, drove MACV’s unobserved firepower reductions during the Vietnam War.
Books on the topic "Viet Nam Air Force"
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My wars: B-17s to F-4s, WWII to Viet Nam with speeds 0 to Mach 2.1. [United States]: [Www.lulu.com], 2008.
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Sepowski, Stephen J., ed. The Ultimate Hint Book. Old Saybrook, CT: The Ultimate Game Club Ltd., 1991.
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1999 Population and Housing Census: Census Monograph on Labour Force and Employment in Viet Nam. Hanoi: General Statistic Office, 2002.
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Viet nam air warfare: The story of the aircraft, the battles, and the pilots who fought. Greenwich Editions, 2002.
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Chuan, Goh Kim. "The Climate of Southeast Asia." In The Physical Geography of Southeast Asia. Oxford University Press, 2005. http://dx.doi.org/10.1093/oso/9780199248025.003.0015.
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Southeast Asia lies between the continental influence of the rest of Asia to the north and the more oceanic influence of the Indian and Pacific Oceans to the south and the east respectively. While its overall net energy balance is very much determined by its latitudinal position, which is approximately between 20°N and 10°S, the locational factors referred to above largely give the regional climate its distinctive character. Within the broad latitudinal extent defined above, the Southeast Asian region has often been conveniently separated into two sub-areas: continental and insular Southeast Asia. In some ways these sub-regions represent a valid delineation into the more seasonal climatic region influenced by the monsoon system of winds and the uniformly humid equatorial climate. The former comprises Myanmar, Thailand, Lao PDR, Cambodia, and Viet Nam, while the latter includes Malaysia, Singapore, Indonesia, and the Philippines. The continental Southeast Asia experiences greater seasonality, more extremes in both temperature and rainfall, and more pronounced dry spells; whereas the insular parts, termed the ‘maritime continent’ (Ramage 1968), with a much greater expanse of sea than land (the sea area of Indonesia, for example, is four times its land area), have more equable climate. The northern and southern continental interactions in winter and summer and the differential heating due to the asymmetric character of the two sub-regions give rise to the monsoon development (Hastenrath 1991), which, to a large extent, influences the rainfall characteristics of the region as a whole. In a sense, more than temperature variations, this monsoonal influence gives the Southeast Asian climate its distinctive character. Figure 5.2 shows the two monsoon wind systems that affect Southeast Asia. In addition to these annual reversals of the monsoon winds, the seasonal migration of the Intertropical Convergence Zone (ITCZ)—closest to the Equator during the northern hemispheric winter and farthest north during summer—is a significant factor in influencing the monthly weather regime of the region. Being a belt of low-pressure trough coinciding with the band of highest surface temperature, the ITCZ attracts the moist easterlies from both hemispheres towards its trough resulting in uplift of air, intense convection, and precipitation. This whole process provides a mechanism for the transfer of latent heat from the low to the higher latitudes (Houze et al. 1981; Hastenrath 1991).
Conference papers on the topic "Viet Nam Air Force"
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Yamasaki, Nobuhiko, Masaaki Hamabe, and Masanobu Namba. "Unsteady Aerodynamic Forces on Vibrating Annular Cascade Blades: Cross-Validation of the Linear Unsteady CFD Calculations Using the TVD Scheme and the Double Linearization Theory." In ASME Turbo Expo 2002: Power for Land, Sea, and Air. ASMEDC, 2002. http://dx.doi.org/10.1115/gt2002-30307.
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The paper presents the formulation to compute numerically the unsteady aerodynamic forces on the vibrating annular cascade blades. The formulation is based on the finite volume method, the type, and the TVD scheme, following the UPACS code developed by NAL, Japan. By applying the TVD scheme to the linear unsteady calculations, the precise calculation of the peak of unsteady aerodynamic forces at the shock wave location like the delta function singularity becomes possible without empirical constants. As a further feature of the present paper, results of the present numerical calculation are compared with those of the double linearization theory (DLT), which assumes small unsteady and steady disturbances but the unsteady disturbances are much smaller than the steady disturbances. Since DLT requires far less computational resources than the present numerical calculation, the validation of DLT is quite important from the engineering point of view. Under the conditions of small steady disturbances, a good agreement between these two results is observed, so that the two codes are cross-validated. The comparison also reveals the limitation on the applicability of DLT.
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Cyrus, John D., David J. Bents, and David M. Overholt. "A Supercharged Turbojet for High Altitude Atmospheric Science Investigations." In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-106.
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A study was conducted for NASA Dryden Flight Research Center to investigate the viability of developing an externally powered zero stage booster fan to boost the altitude performance of a high altitude turbojet from 80 kft. to over 90 kft., in order to realize a very high altitude subsonic remotely piloted aircraft (RPA) capable of atmospheric science missions. A modified non-airbreathing torpedo engine powers the booster fan. The powered fan is grafted onto an airbreathing turbojet (the General Electric YJ97 jet engine) and is used to supercharge the engine (boost inlet pressure and airflow) at altitudes above its original design limits. The inlet boost keeps the engine operating and delivering thrust, at subsonic speeds, to mission altitudes over 95,000 ft. If this modified engine were grafted back into the air vehicle it was originally designed for (the Viet Nam era AQM-91A Compass Arrow) the modifications would enable the vehicle to increase its maximum altitude from 80,000 ft to over 88,000 ft for periods up to 45 min. With some additional wing area, the aircraft, which is in the 5000 lbm TOGW class, could carry a 500 lbm payload to altitudes over 92,000 kft with an operational radius over 1500 NMi. This study examined a number of candidate component arrangements to realize this fan-boosted propulsion system. Performance was estimated for the subsystem components, the resulting propulsion systems, and the associated RPA. In addition, the study estimated the time and cost to demonstrate/validate this concept in a full-scale propulsion system wind tunnel test program. This paper describes the concept, summarizes the concept selection efforts and performance analysis conducted during the study, and explains the rationale behind this unusual approach. A description of the proposed development and test program, and the cost estimate, lies beyond the scope of this paper.