U. S. Navy Marine Gas Turbine Qualification Testing for the 21st Century

1999 ◽  
Author(s):  
Dan A. Groghan ◽  
John J. Hartranft
Keyword(s):  
Gas Turbine ◽  
21St Century ◽  
Gas Turbines ◽  
Service Experience ◽  
The Past ◽  
Surface Ship ◽  
The World ◽  
Qualification Testing ◽  
Commercial Testing ◽  
Defense Budgets

Two primary topics are addressed in this paper: 1. A brief record of the evolution of U. S. Navy (USN) gas turbine qualification and testing requirements that helped produce the successful engines now in service and 2. Examination of these requirements in light of current and projected defense budgets resulting from changes in the world over the past twenty-five years. The paper proposes changes in the current methods the USN employs in qualifying its gas turbines for surface ship applications. The proposed alternate methods consider commercial testing and service experience as well as testing based on MIL-E-17341 requirements. Finally, the marine gas turbine community is invited to begin a dialogue on the feasibility of these alternate methods.

LNG-Based Cogeneration Systems: Part 1—Comparison of Gas-Turbine-Based Concepts

2009 ◽  
Author(s):  
G. Tsatsaronis ◽  
T. Morosuk
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Energy Supply ◽  
Liquefied Natural Gas ◽  
Thermodynamic Efficiency ◽  
The Past ◽  
The World ◽  
Investment Cost ◽  
Cogeneration System ◽  
Part Presentation

Liquefied Natural Gas (LNG) is expected to contribute in future more than in the past to the overall energy supply in the world. The paper is the first part of a two-part presentation. In the first one, some novel concepts for combining LNG regasification with the generation of electricity are discussed, whereas in the second part advanced exergy-based analyses are applied to the most favorable LNG–based cogeneration system. All concepts to be evaluated in the first part use gas turbines, to keep the overall investment cost relatively low. The comparisons are conducted based on thermodynamic efficiency and on the potential for improving this efficiency.

Law Librarianship and Legal Information Provision in the 21st Century

2008 ◽  
Vol 8 (1) ◽  
pp. 4-10 ◽  
Keyword(s):  
21St Century ◽  
Legal Education ◽  
Legal Profession ◽  
Information Provision ◽  
Key Factors ◽  
Legal Information ◽  
The Past ◽  
The World ◽  
The Future ◽  
The Impact

AbstractIn this analysis of the future of our profession, Barbara Tearle starts by looking at the past to see how much the world of legal information has evolved and changed. She considers the nature of the profession today and then identifies key factors which she believes will be of importance in the future, including the impact of globalisation; the potential changes to the legal profession; technology; developments in legal education; increasing commercialisation and changes to the law itself.

scholarly journals A Revaluation of Computational Thinking in K–12 Education: Moving Toward Computational Literacies

2021 ◽  
pp. 0013189X2110579
Author(s):  
Yasmin B. Kafai ◽  
Chris Proctor
Keyword(s):  
21St Century ◽  
Computational Thinking ◽  
Creative Expression ◽  
Career Readiness ◽  
College And Career Readiness ◽  
Computing Education ◽  
The Past ◽  
College And Career ◽  
The World ◽  
K 12

Over the past decade, initiatives around the world have introduced computing into K–12 education under the umbrella of computational thinking. While initial implementations focused on skills and knowledge for college and career readiness, more recent framings include situated computational thinking (identity, participation, creative expression) and critical computational thinking (political and ethical impacts of computing, justice). This expansion reflects a revaluation of what it means for learners to be computationally-literate in the 21st century. We review the current landscape of K–12 computing education, discuss interactions between different framings of computational thinking, and consider how an encompassing framework of computational literacies clarifies the importance of computing for broader K–12 educational priorities as well as key unresolved issues.

scholarly journals Viruses without Borders: Deadly Outbreaks of the 21st Century

2019 ◽  
Vol 3 (1) ◽  
Keyword(s):  
21St Century ◽  
Ebola Virus ◽  
Local Health ◽  
Health Departments ◽  
Local Health Departments ◽  
Mosquito Vectors ◽  
The Past ◽  
International Borders ◽  
The World ◽  
Health Experts

Rapid trends in globalization, increase in population, and genetic diversity of viruses collectively provide grounds for emergence and reemergence of viral outbreaks that are threats to overall continuum of human development. In addition to human factors, environmental factors such as water, soil, mosquito vectors and animals are also contributing to the outbreaks of viral diseases. In the past two decades, we have witnessed some of the deadly viral epidemics of the 21st century such as the Ebola virus epidemic in West Africa [1], Yellow Fever outbreak in Angola [2], the 2009 flu pandemic [3]. Dengue Fever [4], and Zika outbreak especially in Brazil [5], just a few to mention. From such outbreaks occurring unpredictably around the world, infectious diseases epidemiologists and global health experts acknowledge viruses have now evolved to rapidly cross international borders. In countries where resources of rapid viral detection and prevention programs are indeed limited, these outbreaks have produced devastating consequences not only overwhelming the local health departments’ capacity to confront the epidemics, but also, they have had serious and measurable devastating effects on economy and human productivity [6].

scholarly journals Inlet Air Fogging of Marine Gas Turbine in Power Output Loss Compensation

2015 ◽  
Vol 22 (4) ◽  
pp. 53-58 ◽  
Author(s):  
Zygfryd Domachowski ◽  
Marek Dzida
Keyword(s):  
Gas Turbine ◽  
Power Output ◽  
Gas Turbines ◽  
Evaporative Cooling ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Output Loss ◽  
Direct Evaporative Cooling ◽  
Loss Compensation ◽  
The World

Abstract The use of inlet air fogging installation to boost the power for gas turbine engines is widely applied in the power generation sector. The application of fogging to mechanical drive is rarely considered in literature [1]. This paper will cover some considerations relating to its application for gas turbines in ship drive. There is an important evaporative cooling potential throughout the world, when the dynamic data is evaluated, based on an analysis of coincident wet and dry bulb information. This data will allow ships’ gas turbine operators to make an assessment of the economics of evaporative fogging. The paper represents an introduction to the methodology and data analysis to derive the direct evaporative cooling potential to be used in marine gas turbine power output loss compensation.

Raising children in an technologically advanced world

2021 ◽  
pp. 423-426
Author(s):  
Samruddhi Nelson Chauhan
Keyword(s):  
21St Century ◽  
Moral Issue ◽  
Technological Advancement ◽  
Working Parents ◽  
Raising Children ◽  
The Third ◽  
The Past ◽  
The World ◽  
Psychiatric Problems ◽  
Complete Process

“The greatest legacy one can pass on to one’s children and grandchildren is not money or other material things accumulated in one’s life, but rather a legacy of character and faith”. Evangelist Billy Graham.Dining together each night my father- in -law converses with us on how he was born and brought up by his parents long back. having his mother alive all hail and hearty, an old lady of 100 makes him recall his childhood each time he sees her. he flips back on how his father gave him valuable advices on lessons of life, and continues to walks on the principals that his father has imbibed on him as a young boy and he carries a strong impression of his fathers teachings, he expects that the coming generation should live a life as they then lived. childhood in itself is a sweet memory for each one of us, we all have our own bunch of memories to share. childhood is even the most correct time to mould a raw person into a fine personality. living in the 21st century world, things have seemed to be changing a lot. parenting, raising children has become a far more different aspect. since parenting is also an ethical and moral issue, perspective may vary according to the culture and civilization for different people belonging to different set ups. as health personals we too come across many cases that arise merely due to maladjustments or psychological impairments that many a times lead to serious psychiatric problems. the third important thing is that parenting as a complete process and according to the changing time parenting is not the same as it used to be in the past. in the previous years we have been undergoing tremendous technological advancement which in terms is a boon for us. our lifestyles have heavily changed, we no more live in an joined family, we all are working parents and our outlook for a settled life has changed the world around us. we all live in the a world that is modernly civilized. leaving our civilization far behind. raising kids in this advanced world is a challenge indeed. since technology has brought curses as well as boons to our lives. we need to balance them both. things may be difficult but not impossible.

scholarly journals Rethinking the message of the church in the 21st century: An amalgamation between science and religion

2019 ◽  
Vol 75 (4) ◽  
Author(s):  
Dirk G. Van der Merwe
Keyword(s):  
20Th Century ◽  
21St Century ◽  
Science And Religion ◽  
Western World ◽  
The Past ◽  
The Bible ◽  
The World ◽  
The Relationship ◽  
The Church ◽  
Theological Training

Throughout its history, Christianity has stood in a dichotomous relation to the various philosophical movements or eras (pre-modernism, modernism, postmodernism and post-postmodernism) that took on different faces throughout history. In each period, it was the sciences that influenced, to a great extent, the interpretation and understanding of the Bible. Christianity, however, was not immune to influences, specifically those of the Western world. This essay reflects briefly on this dichotomy and the influence of Bultmann’s demythologising of the kerygma during the 20th century. Also, the remythologising (Vanhoozer) of the church’s message as proposed for the 21st century no more satisfies the critical Christian thinkers. The relationship between science and religion is revisited, albeit from a different perspective as established over the past two decades as to how the sciences have been pointed out more and more to complement theology. This article endeavours to evoke the church to consider the fundamental contributions of the sciences and how it is going to incorporate the sciences into its theological training and message to the world.

Inlet Fogging of Gas Turbine Engines: Part B — Fog Droplet Sizing Analysis, Nozzle Types, Measurement and Testing

2002 ◽  
Author(s):  
Mustapha Chaker ◽  
Cyrus B. Meher-Homji ◽  
Thomas Mee
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Measurement Techniques ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Size Measurement ◽  
The Past ◽  
Testing Method ◽  
Measurement And Testing ◽  
Experimental And Theoretical Studies

The inlet fogging of gas turbine engines for power augmentation has seen increasing application over the past decade yet not a single technical paper treating the physics and engineering of the fogging process, droplet size measurement, droplet kinetics, or the duct behavior of droplets, from a gas turbine perspective, is available. This paper provides the results of extensive experimental and theoretical studies conducted over several years, coupled with practical aspects learned in the implementation of nearly 500 inlet fogging systems on gas turbines ranging in power from 5 to 250 MW. Part B of the paper treats the practical aspects of fog nozzle droplet sizing, measurement and testing presenting the information from a gas turbine fogging perspective. This paper describes the different measurement techniques available, covers design aspects of nozzles, provides experimental data on different nozzles and provides recommendations for a standardized nozzle testing method for gas turbine inlet air fogging.

Worldwide Status of the Marine Gas Turbine: 1970

1970 ◽  
Author(s):  
Victor de Biasi ◽  
J. W. Sawyer
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Total Power ◽  
Significant Gain ◽  
Commercial Use ◽  
The World ◽  
Prime Movers

Reviews the world trends since 1966 in the application of gas turbines on both naval and merchant ships. States that the total horsepower increased from 1.9 to 5.8 million in a four-year period, with some 5.5 million horsepower in propulsion. Indicates a definite growth in commercial use from 100,000 to 390,000 hp. Attributes the significant gain in total power due primarily to the availability of proven engines, that are competitive with other prime movers, in the 20,000 hp and above size. Predicts significant increase in use of the marine gas turbine for naval as well as merchant ships when the overall ship, its utilization and supporting shore facilities are considered jointly.

Recognising the Viability of Cooling Gas Turbine Inlet Air in Colder Regions by Using Low Pressure Fogging Techniques

2002 ◽  
Author(s):  
John Confurius
Keyword(s):  
Ambient Temperature ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Cooling System ◽  
Low Pressure ◽  
Air Cooling ◽  
Turbine Inlet ◽  
The World

The profits that can be gained by use of inlet air cooling on gas turbines has been recognised for quite some time now and the systems installed throughout the world have shown the users in the gas turbine field that cooling indeed can be used to boost power at times when the ambient temperature reaches or exceeds the ISO rating temperature of the gas turbine. Drawback however being that the initial investment asked of the gas turbine user is rather large thus only justifying a cooling system in regions where the outdoor temperatures exceed the ISO rating time and again due to the climate in that region. Lately gas turbine users in colder climates have become interested in power augmentation during their short summer, however there is no justification for an investment like necessary when installing one of the presently available systems on the market. As the question reached us from more and more of our clients it stimulated us to go out and search for a low-investment solution to this problem. This resulted in the world’s first low pressure gas turbine inlet cooling system.

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