scholarly journals Design Requirements and Objectives for Commercial Aircraft Propulsion Systems

1969 ◽  
Author(s):  
G. P. Sallee
Keyword(s):  
Power Plant ◽  
Base Line ◽  
Commercial Aircraft ◽  
Propulsion Systems ◽  
Military Equipment ◽  
The Past ◽  
Doing Business ◽  
New Type ◽  
The Military ◽  
Aircraft Propulsion

With the past ten years commercial airlines have begun to move away from their direct dependence on equipment developed by the military. This departure from almost traditional methods of doing business has led to a need for the airlines to define in greater detail the requirements that each new type of equipment must meet for satisfactory airline use. Military equipment in the past served as a technical base line. Today there is no base line equipment and the airlines must shoulder the responsibility for defining the base line requirements. This paper is directed at a few of the important base line requirements for commercial aircraft propulsion systems. In summary, engines must be designed to be installed in aircraft not on a test stand. The design must be directed toward long life, ease of repair, and good long term installed performance. All power plant subsystems must be integrated into the installation, tested early and thoroughly as part of the power plant, and be more reliable and maintainable than current equipment in service.

scholarly journals Engineer Richard Fiedler and his flamethrower epic in Russia on the eve of the First World War

2018 ◽  
Vol 2 (3) ◽  
pp. 64-89
Keyword(s):  
World War I ◽  
World War ◽  
Military Establishment ◽  
Military Equipment ◽  
The First World War ◽  
New Type ◽  
The Creation ◽  
Russian Military ◽  
Technical Solutions ◽  
The Military

The appearance of flamethrowers as weapons is an example of the sagacity of lone individuals in the development of military equipment. Prior to World War I the German engineer Richard Fiedler invented the workable specimens of portable backpack (light) flamethrowers, trench (heavy) flamethrower, automatic igniters to flamethrowers, telescopic automatic flamethrower and other inventions, related to flamethrowing technology. Fiedler managed to reach the gunreach of jet flamethrowers to the distances ​​that are difficult to cover even today, and also to substantiate the tactical methods of their application. Fiedler's flamethrowers were successfully tested in Russia and in Germany in 1909–1910. Using the financial interest of Fiedler, the specialists of the Chief Engineering Directorate of the Russian Military Ministry reached an agreement with him for the purchase of the latest model of the backpack flamethrower, compositions of fire mixtures for various purposes, and certain details of flamethrowers, which he kept secret as his «know-how». However, this line was closed in Russia in 1911 by the Military Minister V.A. Sukhomlinov and his assistant A.A. Polivanov on formal grounds. Fiedler's inventions were not scrutinized by the military establishment of Great Britain and France at all. The opportunity to acquire a new type of weapons was missed for Russia and Entente Powers from the very beginning. The main reason for the indifferent attitude towards flamethrowers in the prewar period was the false ideas about the future war as a maneuverable and quick. The patents for technical solutions beyond the scope of «general ideas» about the means of warfare were also underestimated. But later they became harbingers of the emergence of new directions for the creation of weapons. It is important to take this fact into account while choosing the most promising directions for the creation of military equipment. In Germany, after almost a decade of tests and doubts, Fiedler's flamethrowers were accepted for service and delivered to pioneer detachments in 1912. They were improved and used effectively throughout the war. The Allies were to make their own flamethrowers themselves in the course of war, hastily, mainly from German models. There is no reliable information about the inventor`s fate after 1912.

scholarly journals Factor of force at the declining phase of the scientific and technical revolution

2018 ◽  
Vol 9 (4) ◽  
pp. 94-106
Author(s):  
A. A. Krivopalov
Keyword(s):  
Technological Progress ◽  
The United States ◽  
Technological Revolution ◽  
Military Equipment ◽  
The Past ◽  
Technological Level ◽  
Grand Strategies ◽  
Technological Opportunities ◽  
The Military ◽  
Technical Revolution

The article deals with the problem of slowdown of scientific and technological progress in the military sector resulting from rising costs of developing frontier technologies. Nowadays, the military power of a state is a reflection of its economic and technological opportunities. However, before the start of the scientific and technological revolution, no such correlation could be found, and so, in the past, great European powers were at a relatively similar military and technological level. The power of a state was not so strictly limited by scientific and technological or economic potential of a country. Due to the fact that, even after the start of the scientific and technological revolution, progress in the sphere of military equipment retained its cyclical nature, a question arises: could the world revert to a position of relative technological stagnation that has become a norm during centuries of human development? And if so, what would this mean in terms of big politics and grand strategies? Could this fact play in favour of the countries that challenge the global hegemony of the United States? Will they receive a chance to close their relative gap in the sphere of technology, how and within what timeframe? 

DETERMINATION OF THE DISTRIBUTION FUNCTION OF THE TIME BETWEEN FAILURES OF A WEAPON MODEL WITHOUT TAKING INTO ACCOUNT THE ENEMY’S FIRE IMPACT

2019 ◽  
pp. 39-45
Author(s):  
M. Sliusarenko ◽  
O. Semenenko ◽  
T. Akinina ◽  
O. Zaritsky ◽  
V. Ivanov
Keyword(s):  
Distribution Function ◽  
Analytical Description ◽  
Time To Failure ◽  
Missile Defense ◽  
Incorrect Choice ◽  
Military Equipment ◽  
Time Between Failures ◽  
The Military ◽  
Fire Impact

In the article, based on the analysis of the requirements for the readiness of weapons and military equipment during combat use and the reliability of their operation in the course of combat operations, it was discovered that one of the reasons that causes a discrepancy between the declared failures and real ones may be the incorrect choice and justification of the time distribution function up to the refusal of military means. As a rule, during the development of these tools, the function of distribution of time to failure is chosen by analogy with similar patterns of weapons and military equipment. In the theory of reliability, special attention is given to choosing the function of time-breaking non-response (failures or failures). Therefore, the article deals with the questions of evaluating the effectiveness of functioning of complex systems and methods of modeling the processes of their functioning, taking into account the laws of the distribution of random variables. The discrepancy between the declared irregularity of the military apparatus and the fact that is actually observed in the troops can be explained by the incorrectly accepted hypothesis about the distribution of time to failure. Therefore, the article analyzes the order of the justification of such a function without taking into account the enemy's fire impact and the proposed variant of determining the function of distribution of the time of work until the refusal of the model of military equipment. The article also cites the reasons for the discrepancy between the claimed missile defense equipment and what is actually observed in the troops. The proposed mathematical model of faultlessness, which at stages of designing and design will allow to set requirements to the model of technology with the help of analytical description. The sequence of calculations of non-failure indexes based on the use of Weibull distribution is substantiated.

The Application of International Humanitarian Law by the Israel Defense Forces

2017 ◽  
Author(s):  
Amichai Cohen ◽  
Eyal Ben-Ari
Keyword(s):  
International Humanitarian Law ◽  
Humanitarian Law ◽  
Advocate General ◽  
The Past ◽  
Junior Officers ◽  
Military Commanders ◽  
Legal Frameworks ◽  
Israel Defense Forces ◽  
The Military

This chapter describes how increased juridification and demands to apply international humanitarian law (IHL) have influenced the Israel Defense Forces (IDF). The authors analyze the IDF’s compliance with IHL and other legal frameworks through a multilevel and multidimensional model of military compliance describing the law and external institutions involved in applying it. The past decades have seen the relatively autonomous sphere of the military increasingly come under judicial overview. Judicial and international pressures have also increased the role of the operational legal advisors. The chapter ends by discussing the ceremonies intended to promote compliance with IHL involving soldiers and junior officers. It is based on interviews (with Israeli academic experts, members of nongovernmental organizations [NGOs], and military commanders), off-the-record conversations with members of the IDF’s Military Advocate General, and newspaper articles, reports of NGOs, and secondary material.

scholarly journals Powering Ahead

2011 ◽  
Vol 133 (05) ◽  
pp. 30-33 ◽  
Author(s):  
Lee S. Langston
Keyword(s):  
Power Plant ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Nuclear Power ◽  
Electrical Power ◽  
The United States ◽  
Combined Cycle ◽  
Electrical Power System ◽  
Efficient Technology ◽  
The Military

This article explores the increasing use of natural gas in different turbine industries and in turn creating an efficient electrical system. All indications are that the aviation market will be good for gas turbine production as airlines and the military replace old equipment and expanding economies such as China and India increase their air travel. Gas turbines now account for some 22% of the electricity produced in the United States and 46% of the electricity generated in the United Kingdom. In spite of this market share, electrical power gas turbines have kept a much lower profile than competing technologies, such as coal-fired thermal plants and nuclear power. Gas turbines are also the primary device behind the modern combined power plant, about the most fuel-efficient technology we have. Mitsubishi Heavy Industries is developing a new J series gas turbine for the combined cycle power plant market that could achieve thermal efficiencies of 61%. The researchers believe that if wind turbines and gas turbines team up, they can create a cleaner, more efficient electrical power system.

The Diaspora of the Novel

1992 ◽  
Vol 2 (1) ◽  
pp. 131-146
Author(s):  
Artemis Leontis
Keyword(s):  
Uneven Development ◽  
Literary Genre ◽  
The Novel ◽  
History Of The Novel ◽  
The West ◽  
The Past ◽  
The Social ◽  
Economic Transformations ◽  
History Of ◽  
New Type

Reflection on the history of the novel usually begins with consideration of the social, political, and economic transformations within society that favored the “rise” of a new type of narrative. This remains true even with the numerous and important studies appearing during the past ten years, which relate the novel to an everbroadening spectrum of ideological issues—gender, class, race, and, most recently, nationalism. Yet a history of the genre might reflect not just on the novel’s national, but also its transnational, trajectory, its spread across the globe, away from its original points of emergence. Such a history would take into account the expansion of western markets—the growing exportation of goods and ideas, as well as of social, political, and cultural forms from the West—that promoted the novel’s importation by nonwestern societies. Furthermore, it could lead one to examine the very interesting inverse relationship between two kinds of migration, both of which are tied to the First World’s uneven “development” of the Third. In a world system that draws out natural resources in exchange for technologically mediated goods, the emigration of laborers and intellectuals from peripheral societies to the centers of power of the West and the immigration of a western literary genre into these same societies must be viewed as related phenomena.

Famous teachers and educators of the first half of the XX century about the problems of the North Caucasian muslim education.

2021 ◽  
Vol 13 (2) ◽  
pp. 208-222
Author(s):  
Nadezhda O. Bleich ◽  
Keyword(s):  
Educational Process ◽  
Point Of View ◽  
Practical Significance ◽  
Past Century ◽  
North Caucasus ◽  
Caucasus Region ◽  
The Past ◽  
The North ◽  
New Type ◽  
Historical Heritage

The article is devoted to the consideration of the worldview positions of famous educators of the past century regarding the state of school education among Muslims of the North Caucasus region. It is proved that the enlighteners advocated the creation of a new type of national non-class school and the construction of the didactic foundations of the educational process in it. The novelty of the work is that, based on the analysis of the views of the advanced intelligentsia of the region, aimed at understanding the current socio-cultural situation, an attempt was made to scientifically understand the problems and prospects for the development of the Muslim educational system of the past from the point of view of the modern scientific paradigm. The practical significance of the publication lies in expanding the understanding of the system of Mohammedan education in the context of its historical heritage, which will help to comprehend modern problems associated with the reform of general and vocational education in the national Muslim republics.

1968. The “Prague Spring”: Fifty Years Later. Historical Essays

2021 ◽  
Keyword(s):  
Twentieth Century ◽  
Eastern Europe ◽  
Market Economy ◽  
Central And Eastern Europe ◽  
Educational Institutions ◽  
General Reader ◽  
The Past ◽  
Relevant Today ◽  
Prague Spring ◽  
The Military

This book is devoted to a symbolic event that defined the life and values of several generations. Half a century ago, Czech communists tried to give a new impetus to their country’s system of government by combining socialist values with a rational market economy and the mechanisms of a developed democracy. This effort failed, and the state was occupied by the military. This book is the result of joint efforts by Russian, Czech, and Romanian historians, archivists, and cultural and literary scholars, who—exploring new documents and materials—have reinterpreted these events and their lessons from a present-day perspective. Objectively, the “Prague Spring” is from a bygone era, but it is still a milestone, and many of the problems encountered during the Prague Spring are still relevant today. The authors hope that they have contributed to the historiography of the now-distant events of 1968 and that their contributions will help in analysing the experiences of the past in order to be prepared for the events of the future. This book is aimed at specialists in the history and culture of Central and Eastern Europe, students of higher educational institutions, and the general reader interested in twentieth-century history.

Verification of Plastic Interactive Systems

i-com ◽  
2015 ◽  
Vol 14 (3) ◽  
Author(s):  
Raquel Oliveira ◽  
Sophie Dupuy-Chessa ◽  
Gaëlle Calvary
Keyword(s):  
Power Plant ◽  
User Interfaces ◽  
Nuclear Power ◽  
Interactive Systems ◽  
System Model ◽  
Equivalence Checking ◽  
The Past ◽  
Different Levels ◽  
Formal Techniques

AbstractInteractive systems have largely evolved over the past years. Nowadays, different users can interact with systems on different devices and in different environments. The user interfaces (UIs) are expected to cope with such variety. Plastic UIs have the capacity to adapt to changes in their context of use while preserving usability. Such capability enhances UIs, however, it adds complexity on them. We propose an approach to verifying interactive systems considering this adaptation capability of the UIs. The approach applies two formal techniques: model checking, to the verification of properties over the system model, and equivalence checking, to compare different versions of a UI, thereby identifying different levels of UI equivalence. We apply the approach to a case study in the nuclear power plant domain in which several UI are analyzed, properties are verified, and the level of equivalence between them is demonstrated.

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