Torpedo Propulsion Systems

1980 ◽  
Vol 102 (1) ◽  
pp. 85-90
Author(s):  
R. K. Gottfredson
Keyword(s):  
State Of The Art ◽  
Major Portion ◽  
Energy Sources ◽  
Short Discussion ◽  
Propulsion Systems ◽  
Generic Type ◽  
Advantages And Disadvantages ◽  
Prime Movers ◽  
Open Cycle

The paper begins with a short discussion of torpedo propulsion criteria followed by definitions of the three generic torpedo types and a brief description of each. A major portion of the paper is devoted to descriptions of lightweight anti-submarine torpedoes since the greatest advances in technology will be required for this generic type. Two basic torpedo propulsion systems are discussed; electric and open cycle thermal. Advantages and disadvantages of both types are pointed out followed by examples representative of state-of-the-art systems. In depth presentations of various energy sources, prime movers, and speed reducers are given and several new potential propulsion subsystems are described.

scholarly journals Электрохимические источники энергии для судовых комбинированных гребных электрических установок

2021 ◽  
Vol 70 (2) ◽  
pp. 97-100
Author(s):  
А.Ф. Бурков ◽  
В.В. Миханошин ◽  
В.Х. Нгуен
Keyword(s):  
Operating Conditions ◽  
Primary Sources ◽  
Energy Sources ◽  
Propulsion Systems ◽  
Advantages And Disadvantages ◽  
Stage Of Development ◽  
Marine Propulsion ◽  
Static Energy ◽  
Technical Solutions ◽  
Power Installations

At the present stage of development of marine propulsion systems for coastal navigation vessels, it seems appropriate to use combined power installations with various scientific and technical solutions. The primary sources of such installations, along with electromechanical converters, include electrochemical static energy sources – batteries. The specific operating conditions of such sources in ship conditions limit their list for combined installations. The article discusses the varieties of static energy sources, their advantages and disadvantages, which allow us to conclude that it is economically feasible to use them in combined electric power installations.

Experiments in IPE Research

2021 ◽  
Author(s):  
Gabriele Spilker
Keyword(s):  
Political Economy ◽  
Foreign Aid ◽  
Standard Method ◽  
International Political Economy ◽  
State Of The Art ◽  
Experimental Studies ◽  
Potential Outcomes ◽  
Short Discussion ◽  
Advantages And Disadvantages ◽  
Potential Outcomes Framework

Over the last decade, experiments have developed from a marginally employed to an increasingly standard method in the study of International Political Economy (IPE). After a short discussion of causal inference and the potential outcomes framework, this chapter outlines different kinds of experiments used to study questions concerning trade, migration, foreign aid, or investment. The chapter thereby not only strives to provide an overview of the state-of-the-art in experimental IPE research but also to outline the different roles or functions experimental studies can fulfill to further our knowledge on IPE. The chapter concludes by critically discussing both advantages and disadvantages of the experimental turn in IPE.

scholarly journals On electric power generation issues in ship electric propulsion systems

2021 ◽  
Vol 3 (397) ◽  
pp. 83-91
Author(s):  
S. Kazanov ◽  
Keyword(s):  
Power Generation ◽  
Electric Power ◽  
Electric Propulsion ◽  
State Of The Art ◽  
Power Conversion ◽  
Propulsion Systems ◽  
Electric Power Generation ◽  
Advantages And Disadvantages ◽  
Electric Power Generation Systems ◽  
Power Generation Systems

Object and purpose of research. The object and purpose of this study is generation of electric power for electric propulsion of ship and vessels; methods and problems, state-of-the-art and trend analysis are presented. Materials and methods. The main principles and methods of electric power generation using various generating and power conversion systems are briefly discussed. Their advantages and disadvantages are identified based on publication in this field. Main results. Achievements in the modern methods of power generation for ships, as well as ways of its transformation are highlighted. A detailed analysis of the state-of-the-art and trends in ship electric power generation is given. Various options of engines and generators are considered, including advanced types. Their characteristics are thoroughly analyzed based on the international publications. Conclusion. Conclusions are formulated regarding achievements and current problems in ship electric power generation systems.

scholarly journals ALTERNATIVE MOTORS IN AVIATION

Aviation ◽  
2014 ◽  
Vol 18 (4) ◽  
pp. 174-177 ◽  
Author(s):  
Mirvat Kaddour
Keyword(s):  
Alternative Energy ◽  
Air Travel ◽  
Air Transport ◽  
Energy Sources ◽  
Propulsion Systems ◽  
Fuel Prices ◽  
Advantages And Disadvantages ◽  
Alternative Energy Sources ◽  
Increasing Demand ◽  
Alternative Propulsion Systems

The increasing demand for air travel leads to more pollution produced by air transport. At the same time the fuel prices are constantly rising. Therefore, it becomes necessary to find alternative energy sources for aircraft (alternative fuel, motors). In this article alternative propulsion systems (fuel) that can be used in aviation, their advantages and disadvantages are reviewed.

Platelet monitoring for PCI

2009 ◽  
Vol 29 (04) ◽  
pp. 376-380 ◽  
Author(s):  
D. Capodanno ◽  
D. J. Angiolillo
Keyword(s):  
Interindividual Variability ◽  
State Of The Art ◽  
Coronary Intervention ◽  
Functional Tests ◽  
Treatment Regimens ◽  
Advantages And Disadvantages ◽  
Coronary Syndrome ◽  
Combined Use ◽  
Increased Risk ◽  
Percutaneous Coronary

SummaryDespite the clinical benefit associated with the combined use of aspirin and clopidogrel in patients with acute coronary syndrome or those undergoing percutaneous coronary intervention, a considerable interindividual variability in response to these drugs have been consistently reported. There is a growing interest on applying platelet functional tests with the goal of identifying patients at increased risk of recurrent ischaemic events and potentially tailoring antiplatelet treatment regimens.This manuscript will review the state of the art on the most commonly available platelet functional tests, describing their advantages and disadvantages and exploring their applicability in clinical practice.

scholarly journals Progresses in Analytical Design of Distribution Grids and Energy Storage

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4270
Author(s):  
Gianpiero Colangelo ◽  
Gianluigi Spirto ◽  
Marco Milanese ◽  
Arturo de Risi
Keyword(s):  
Renewable Energy ◽  
Power Flow ◽  
State Of The Art ◽  
Renewable Energy Sources ◽  
Energy Sources ◽  
Distribution Grid ◽  
Mathematical Methods ◽  
Power Generators ◽  
Bidirectional Power Flow ◽  
Distribution Grids

In the last years, a change in the power generation paradigm has been promoted by the increasing use of renewable energy sources combined with the need to reduce CO2 emissions. Small and distributed power generators are preferred to the classical centralized and sizeable ones. Accordingly, this fact led to a new way to think and design distributions grids. One of the challenges is to handle bidirectional power flow at the distribution substations transformer from and to the national transportation grid. The aim of this paper is to review and analyze the different mathematical methods to design the architecture of a distribution grid and the state of the art of the technologies used to produce and eventually store or convert, in different energy carriers, electricity produced by renewable energy sources, coping with the aleatory of these sources.

scholarly journals A Systematic Review of Recommender Systems and Their Applications in Cybersecurity

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5248
Author(s):  
Aleksandra Pawlicka ◽  
Marek Pawlicki ◽  
Rafał Kozik ◽  
Ryszard S. Choraś
Keyword(s):  
Systematic Review ◽  
Recommender Systems ◽  
Recommender System ◽  
State Of The Art ◽  
The State ◽  
Advantages And Disadvantages ◽  
Comprehensive Survey ◽  
Security Concerns ◽  
Valuable Role

This paper discusses the valuable role recommender systems may play in cybersecurity. First, a comprehensive presentation of recommender system types is presented, as well as their advantages and disadvantages, possible applications and security concerns. Then, the paper collects and presents the state of the art concerning the use of recommender systems in cybersecurity; both the existing solutions and future ideas are presented. The contribution of this paper is two-fold: to date, to the best of our knowledge, there has been no work collecting the applications of recommenders for cybersecurity. Moreover, this paper attempts to complete a comprehensive survey of recommender types, after noticing that other works usually mention two–three types at once and neglect the others.

scholarly journals Summer Research Placements – State-of-the-Art Science by pre-University Students

MRS Advances ◽  
2016 ◽  
Vol 1 (56) ◽  
pp. 3715-3720 ◽  
Author(s):  
R. A. Sporea ◽  
S. Lygo-Baker
Keyword(s):  
University Students ◽  
State Of The Art ◽  
Group Learning ◽  
Student Interaction ◽  
Research Tool ◽  
Skills Acquisition ◽  
Advantages And Disadvantages ◽  
Effective Training ◽  
Training And Research ◽  
Student Training

ABSTRACTSummer research placements are an effective training and research tool. Over three years, our group has hosted nine pre-university students over periods of four to six weeks. Apart from student training and skills acquisition, the placements have produced several peer-reviewed technical publications. Our approach relies on careful pre-planning of activities, frequent student interaction, coupled with independent and group learning. We explore the advantages and disadvantages of this manner of running summer placements.

New Trends in Asymptotic Approaches: Summation and Interpolation Methods

2001 ◽  
Vol 54 (1) ◽  
pp. 69-92 ◽  
Author(s):  
Igor V. Andrianov ◽  
Jan Awrejcewicz
Keyword(s):  
Applied Sciences ◽  
Solid Mechanics ◽  
State Of The Art ◽  
Asymptotic Methods ◽  
Perturbation Series ◽  
Review Article ◽  
Point Of View ◽  
Advantages And Disadvantages ◽  
New Methods ◽  
Local Character

In this review article, we present in some detail new trends in application of asymptotic techniques to mechanical problems. First we consider the various methods which allows for the possibility of extending the perturbation series application space and hence omiting their local character. While applying the asymptotic methods very often the following situation appears: an existence of the asymptotics ε → 0 implies an existence of the asymptotics ε → ∞ (or, in a more general sense, ε → a and ε → b). Therefore, an idea of constructing a single solution valid for a whole interval of parameter ε changes is very attractive. In other words, we discuss a problem of asymptotically equivalent function constructions possessing for ε → a and ε → b a known asymptotic behavior. The defined problems are very important from the point of view of both theoretical and applied sciences. In this work, we review the state-of-the-art, by presenting the existing methods and by pointing out their advantages and disadvantages, as well as the fields of their applications. In addition, some new methods are also proposed. The methods are demonstrated on a wide variety of static and dynamic solid mechanics problems and some others involving fluid mechanics. This review article contains 340 references.

scholarly journals Multi-Criteria Decision-Making (MCDM) for the Assessment of Renewable Energy Technologies in a Household: A Review

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1164 ◽  
Author(s):  
Indre Siksnelyte-Butkiene ◽  
Edmundas Kazimieras Zavadskas ◽  
Dalia Streimikiene
Keyword(s):  
Decision Making ◽  
Renewable Energy ◽  
Scientific Literature ◽  
Renewable Energy Sources ◽  
Multiple Criteria Decision Making ◽  
Energy Sources ◽  
Renewable Energy Technologies ◽  
Advantages And Disadvantages ◽  
Energy Technologies ◽  
Depth Analysis

Different power generation technologies have different advantages and disadvantages. However, if compared to traditional energy sources, renewable energy sources provide a possibility to solve the climate change and economic decarbonization issues that are so relevant today. Therefore, the analysis and evaluation of renewable energy technologies has been receiving increasing attention in the politics of different countries and the scientific literature. The household sector consumes almost one third of all energy produced, thus studies on the evaluation of renewable energy production technologies in households are very important. This article reviews the scientific literature that have used multiple-criteria decision-making (MCDM) methods as a key tool to evaluate renewable energy technologies in households. The findings of the conducted research are categorized according to the objectives pursued and the criteria on which the evaluation was based are discussed. The article also provides an overview and in-depth analysis of MCDM methods and distinguishes the main advantages and disadvantages of using them to evaluate technologies in households.

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