scholarly journals Waiting for Breakthrough in Conventional Submarine’s Prime Movers

2019 ◽  
Vol 8 (1) ◽  
pp. 37-45
Author(s):  
Tomasz Lus
Keyword(s):  
Diesel Engines ◽  
Technological Development ◽  
High Reliability ◽  
Lithium Ion ◽  
Armed Forces ◽  
Propulsion System ◽  
Point Of View ◽  
Statistical Research ◽  
Heavy Load ◽  
Most Significant Change

Submarines, as a very expensive and sophisticated type of weaponry, are being intensively exploited by the armed forces of many countries. This means that submarines are sent ever longer patrols, sometimes to distant regions. To meet such requirements, submarine sub-systems and components must have high reliability and operational readiness indicators. Among the many machines and devices found on submarines, the ones that generate, store, and consume energy (mainly electricity) deserve special attention. The largest energy consumers on the submarine are the components of its propulsion system. One of the most complicated and loaded devices on board submarine is a power generator with a diesel engine driving it, on whose continuous and reliable work the safe performance of tasks depends. According to statistical research, despite its importance for the process of performing tasks by submarines, diesel engines are still the least reliable devices on submarines. Despite the constant technological development of piston engines, their work in very difficult conditions under heavy load and at high counter-pressure at the exhaust outlet promotes their malfunction and damage. From this point of view, the development of charge air systems for submarine diesel engines based on the construction experience of MTU Company is described in the paper. The classification of submarines, their propulsion systems, and the working conditions of engines on submarines are presented in the paper. Air-Independent Propulsion (AIP) systems with their applications on chosen submarines are also described. The most significant change in submarine propulsion system observed in 2018, transition from lead-acid to lithium-ion batteries, is also presented.

Design of a High Reliability Compact CubeSat Propulsion System

2021 ◽  
Author(s):  
Carl Hartsfield ◽  
Travis E. Shelton ◽  
Greg Cobb
Keyword(s):  
High Reliability ◽  
Propulsion System

scholarly journals Energy Storage in crystalline Materials based on multivalent Ions

2014 ◽  
Vol 70 (a1) ◽  
pp. C365-C365
Author(s):  
Tina Nestler ◽  
William Förster ◽  
Stefan Braun ◽  
Wolfram Münchgesang ◽  
Falk Meutzner ◽  
...  
Keyword(s):  
Electric Energy ◽  
Lithium Ion ◽  
Point Of View ◽  
Electrical Performance ◽  
Ion Diffusion ◽  
Crystalline Materials ◽  
Multivalent Ions ◽  
Main Challenge ◽  
Energy Conversion And Storage ◽  
Solid State Batteries

Energy conversion and storage has become the main challenge to satisfy the growing demand for renewable energy solutions as well as mobile applications. Nowadays, several technologies exist for the conversion of electric energy into e. g. heat, light and motion or vice versa. Among a large variety of storage concepts, the conversion of electrical in chemical energy is of great relevance in particular for location-independent use. Main factors that still limit the use of electrochemical cells are the volumetric and gravimetric energy density, cyclability as well as safety. The concept for a new thin-film rechargeable battery that possibly improves these properties is presented. In contrast to the widespread lithium-ion technology, the discussed battery is based on the redox reaction of multivalent Al-ions and their migration through solid electrolytes. The ion conduction and insertion processes in the crystalline materials of the suggested cell are discussed under a crystallographic point of view to identify suitable electrode and separator materials. A multilayer-stack of all-solid-state batteries is synthesized by pulsed laser deposition and investigated in situ, i. e. during charge and discharge, by X-ray reflection and diffraction methods. The correlation between crystal structure, morphology and electrical performance is investigated in order to characterize the ion diffusion and insertion process.

Design and Characteristics of Microfocus X-ray Source with Sealed Tube and Transmissive Target on Diamond Window

2021 ◽  
Vol 79 (6) ◽  
pp. 631-640
Author(s):  
Takaaki Tsunoda ◽  
Takeo Tsukamoto ◽  
Yoichi Ando ◽  
Yasuhiro Hamamoto ◽  
Yoichi Ikarashi ◽  
...  
Keyword(s):  
Power Density ◽  
High Power ◽  
High Speed ◽  
Electronic Device ◽  
High Reliability ◽  
Electronic Devices ◽  
Lithium Ion ◽  
High Power Density ◽  
High Magnification ◽  
X Ray

Electronic devices such as medical instruments implanted in the human body and electronic control units installed in automobiles have a large impact on human life. The electronic circuits in these devices require highly reliable operation. Radiographic testing has recently been in strong demand as a nondestructive way to help ensure high reliability. Companies that use high-density micrometer-scale circuits or lithium-ion batteries require high speed and high magnification inspection of all parts. The authors have developed a new X-ray source supporting these requirements. The X-ray source has a sealed tube with a transmissive target on a diamond window that offers advantages over X-ray sources having a sealed tube with a reflective target. The X-ray source provides high-power-density X-ray with no anode degradation and a longer shelf life. In this paper, the authors will summarize X-ray source classification relevant to electronic device inspection and will detail X-ray source performance requirements and challenges. The paper will also elaborate on technologies employed in the X-ray source including tube design implementations for high-power-density X-ray, high resolution, and high magnification simultaneously; reduced system downtime for automated X-ray inspection; and reduced dosages utilizing quick X-ray on-and-off emission control for protection of sensitive electronic devices.

The Need for Speed – Technological Acceleration and Inevitabilism in Recent Danish Digitalization Policy Papers

SATS ◽  
2021 ◽  
Vol 22 (1) ◽  
pp. 27-48
Author(s):  
Mads Vestergaard
Keyword(s):  
Empirical Analysis ◽  
Industrial Revolution ◽  
Technological Development ◽  
Point Of View ◽  
Technological Determinism ◽  
Economic Values ◽  
Fourth Industrial Revolution ◽  
Sociotechnical Imaginaries ◽  
Official Policy ◽  
The Empirical Analysis

Abstract The article explores whether sociotechnical imaginaries of digitalization as inevitable accelerating development can be traced in Denmark’s official policy papers concerning digitalization 2015–2020. It identifies imperatives of speed, acceleration and agility equal to what has been described as a corporate data imaginary as well as tropes of an imaginary of the fourth industrial revolution and inevitable exponential technological development and disruption. The empirical analysis discovers a shift in the studied period mid-2018, before which inevitabilism is prominent and after which the focus on non-economic values increases and the aim of influencing the development, instead of adapting to it, emerges. The article then addresses how imperatives of acceleration and narratives of inevitabilism may be considered problematic from a democratic point of view employing Hartmut Rosa’s critical diagnosis of the acceleration society and the notion of discursive closure. Finally, it discusses the empirical findings in light of technological determinism and constructivism inherent in the notion of sociotechnical imaginaries and introduces a sociotechnical selectionist theory allowing both for human agency in technological development while also providing a mechanism for explaining the emergence of law-like technological trends, as Moore’s Law, at macro level.

scholarly journals SISI NEGATIF GAME ONLINE PERSPEKTIF ISLAM DAN PSIKOLOGI ISLAM

2021 ◽  
Vol 5 (2) ◽  
pp. 153
Author(s):  
Khotibul Umam ◽  
Abdul Muhid
Keyword(s):  
Literature Review ◽  
Life Style ◽  
Negative Impact ◽  
Technological Development ◽  
Human Life ◽  
Online Games ◽  
Point Of View ◽  
Technological Advances ◽  
Islamic Psychology ◽  
Almost All

Technological development has changed human life style. Child's world that was once filled with traditional games has now been eroded by technological advances. Nowadays online games that replace traditional games are not only favored by children, almost all levels of human age like playing online games. But behind it all there is a negative impact that haunts its users. This study aims to reveal the negative side of using online games from the point of view of Islam and Islamic Psychology. The technique used is literature review by compiling some previous articles. The results showed that excessive use of online games will give a bad impact on the physical and psychological users, such as visual impairment, sleep disturbance, addiction, violence and stress. The use of online games is also considered more disadvantage than the benefits and it’s seen as an activity that wastes time, and it is prohibited in Islam.

scholarly journals TOPICAL ISSUES OF RESEARCH AND EDUCATIONAL POLICY DEVELOPMENT IN RUSSIA

2020 ◽  
Vol 9 (02) ◽  
pp. 197-211
Author(s):  
Anna Rozentsvaig ◽  
R. A. Vdovin
Keyword(s):  
Artificial Intelligence ◽  
Educational Policy ◽  
Policy Development ◽  
Legal Status ◽  
Technological Development ◽  
Legal Regulation ◽  
Competence Development ◽  
Point Of View ◽  
Research Education ◽  
World Class

The article deals with some directions of the research and educational policy development. The correlation of approaches to the development of the strategic academic leadership program and the world-class research and educational centers establishing, centers of competence development is analyzed. Engineering knowledge and technology are at the heart of the modern economy. Engineering methods, approaches, and technologies have permeated medicine, biology, agriculture, chemistry, and the development of new materials. Understanding the directions of technological development determines the prospects for creating and using new products. further development of the issue related to the introduction of artificial intelligence technologies in the engine-building industry from the point of view of legal regulation will allow to consolidate the official legal status of such technologies at the legal level and regulate the algorithm and delimit the use of artificial intelligence technologies. The analysis of responses to the big challenges of scientific and technological development and the exhaustion of economic growth opportunities, the formation of the digital economy and the risks of reducing human resources. The development of international accreditation procedures is proposed. Keywords: Research; Education: Research and educational center: Competence development center; Artificial intelligence technologies: International accreditation.

Production of Electricity in Photovoltaic Systems for Administrative Buildings in Romania, Technical and Economic Analysis

2014 ◽  
Vol 659 ◽  
pp. 431-434
Author(s):  
Cătălin George Popovici ◽  
Marius Costel Balan ◽  
Marina Verdeș ◽  
Vasilică Ciocan ◽  
Andrei Burlacu ◽  
...  
Keyword(s):  
Technological Development ◽  
Classical System ◽  
Electrical Energy ◽  
Point Of View ◽  
Past Century ◽  
Photovoltaic Systems ◽  
Pronounced Increase ◽  
Economic Point ◽  
Electricity Grid ◽  
Solar Radiation Intensity

One of the effects of technological development of all human societies over the past century is more pronounced increase in energy consumption, but more pronounced dependence on fossil fuel consumption, especially as oil, natural gas and coal.The paper presents a comparative analysis of technical and economic point of view of two systems, the first using the classical system (national electricity grid) and the second using the new unconventional technology with photovoltaic systems for administrative building in rural areas.For correct evaluation of the performance of this systems providing electrical energy requires some assumptions about the consumption of electricity, the solar radiation intensity, the energy cost and the climate zones of the location.

scholarly journals Intelligent Tutoring Systems

2017 ◽  
Vol 26 (4) ◽  
pp. 717-727 ◽  
Author(s):  
Vladimír Bradáč ◽  
Kateřina Kostolányová
Keyword(s):  
Intelligent Tutoring Systems ◽  
Technological Development ◽  
Intelligent Tutoring ◽  
Intelligent Tutoring System ◽  
Point Of View ◽  
Tertiary Sector ◽  
Tutoring Systems ◽  
Number Of Ends ◽  
E Learning ◽  
Education Of Students

AbstractThe importance of intelligent tutoring systems has rapidly increased in past decades. There has been an exponential growth in the number of ends users that can be addressed as well as in technological development of the environments, which makes it more sophisticated and easily implementable. In the introduction, the paper offers a brief overview of intelligent tutoring systems. It then focuses on two types that have been designed for education of students in the tertiary sector. The systems use elements of adaptivity in order to accommodate as many users as possible. They serve both as a support of presence lessons and, primarily, as the main educational environment for students in the distance form of studies – e-learning. The systems are described from the point of view of their functionalities and typical features that show their differences. The authors conclude with an attempt to choose the best features of each system, which would lead to creation of an even more sophisticated intelligent tutoring system for e-learning.

Development and testing of an efficient and cost-effective underwater propulsion system

2019 ◽  
Vol 233 (10) ◽  
pp. 1309-1328
Author(s):  
Libero Paolucci ◽  
Emanuele Grasso ◽  
Francesco Grasso ◽  
Niklas König ◽  
Marco Pagliai ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
High Efficiency ◽  
High Reliability ◽  
Underwater Vehicle ◽  
Propulsion System ◽  
Permanent Magnet Synchronous Motors ◽  
Synchronous Motors ◽  
Vehicle Propulsion ◽  
Underwater Propulsion ◽  
Thrust And Torque

Underwater vehicle propulsion performed by exploiting electrical motor is in general the most flexible solution and it is growing in popularity because of its high efficiency both at high and at low advance speed, quick and simple deployment, low costs, and encumbrance. In the present work, permanent magnet synchronous motors for underwater propulsion are proposed. In particular, advanced sensorless control techniques of permanent magnet synchronous motors permit reduced costs, high reliability, and performances. When dealing with small autonomous underwater vehicle propulsion, such devices are hard to find in the market. Hence, the authors focused the research in the development of a system able to perform a reliable rotational speed and torque sensorless estimation. The design and implementation of a complete solution for underwater propulsion are presented as well as a novel rotor polarity identification technique exploiting a high-frequency injection control. Pool tests for the identification of the performances and of the dynamic parameters of the propulsion system are presented. Finally, the possibility of operating a sensorless estimation of the thrust and torque exerted by the propeller and pool test measurements are presented. These features could be exploited to improve navigation accuracy and involves obvious benefits in terms of cost reduction and reliability of the system.

scholarly journals A Review of Concepts, Benefits, and Challenges for Future Electrical Propulsion-Based Aircraft

Aerospace ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 44 ◽  
Author(s):  
Smruti Sahoo ◽  
Xin Zhao ◽  
Konstantinos Kyprianidis
Keyword(s):  
Technological Development ◽  
Propulsion System ◽  
New Paradigm ◽  
Modeling Framework ◽  
Future Technology ◽  
Electric Aircraft ◽  
Electrical Propulsion ◽  
Development Paths ◽  
System Configurations ◽  
Insight Into

Electrification of the propulsion system has opened the door to a new paradigm of propulsion system configurations and novel aircraft designs, which was never envisioned before. Despite lofty promises, the concept must overcome the design and sizing challenges to make it realizable. A suitable modeling framework is desired in order to explore the design space at the conceptual level. A greater investment in enabling technologies, and infrastructural developments, is expected to facilitate its successful application in the market. In this review paper, several scholarly articles were surveyed to get an insight into the current landscape of research endeavors and the formulated derivations related to electric aircraft developments. The barriers and the needed future technological development paths are discussed. The paper also includes detailed assessments of the implications and other needs pertaining to future technology, regulation, certification, and infrastructure developments, in order to make the next generation electric aircraft operation commercially worthy.

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