879 research outputs found
Going Green
No full textIn future an increasingly larger share of electricity will come from renewable sources (off-shore windmills, solar plants, etc.), while consumption of electricity also increases (incl. electric vehicles). The consequence of these developments is that more electricity is moved over the power networks. Electrical networks will become smart grids with more superconducting components replacing conventional counterparts. Recently the High Voltage research group and the High Voltage Laboratory of TU Delft are involved in a pilot project for a 6 km long high voltage HTS power cable in the Netherlands.Electrical Engineering, Mathematics and Computer Scienc
Cryostat for a high-temperature superconducting power cable
No full textCryostat for a high-temperature superconducting power cable, comprising concentric tubes, an annular region between said tubes, wherein a multilayer thermal insulation and getter material for supporting high vacuum conditions are provided in said annular region, and wherein the multilayer insulation comprises reflective layers separated by fibrous spacer material, wherein the fibrous spacer material comprises activated carbon micro-fibers and/or activated carbon nano-fibers. Beneficially the getter material is at least in part embodied in the activated carbon fibers of the fibrous spacer material.Electrical Sustainable EnergyElectrical Engineering, Mathematics and Computer Scienc
New materials in high voltage technology
No full textAssets in high voltage technology have to meet harsh service conditions over long lifetimes of 40 years or more. Due to environmental concerns, substitution of conventional insulating materials becomes a necessity. Because robustness and sustainability are serious requirements, only few new materials are really breaking through. At present some promising material technologies emerge with great potential applicability in high voltage engineering. This paper discusses especially nanocomposites and high temperature superconductors.Electrical Sustainable EnergyElectrical Engineering, Mathematics and Computer Scienc
On the application of High-Tc superconductors in power coils and transformers
No full textIn this study, the electro-magnetic properties of high-Tc tapes and coils are investigated. The focus is on Bi-2223/Ag tapes with non-twisted superconducting filaments as these are the only high-Tc superconductors at present available in sufficient length for practical applications. The study is confined to high-temperature superconductors and power coils operated in liquid nitrogen and intended for large-scale applications. The aim of the study is three-fold: to explore the options and the potential of increasing the critical currents and reducing the alternating current losses of practical superconductors in power coils hence aiming at improved performance; to build a model that is sufficient to describe behaviour and to calculate voltage-current characteristics of advanced Bi-2223 superconductors and coils carrying alternating current and exposed to alternating magnetic field; the application target is to develop fundamentals of high-Tc superconducting power coils and as an example to make and to study a prototype 1-MVA resonator coil both experimentally and numerically and hence to demonstrate the feasibility and predictable behaviour of high-Tc superconducting power devices. The final objective is, using the knowledge and the experience gained in the study, to evaluate the viability of a power transformer with high-Tc superconducting coils
Implementation of O.A. Igelstrom’s Reforms in the Steppe of Orenburg Region
No full textThe article describes the process of implementing the reforms by O.A. Igelstrom in the Small Kazakh Horde. The author briefly acquaints with the main content of reforms of governance of the Orenburg part of the Kazakh steppe in the 1870. The main motives and the purposes of regional administration in carrying out administration reforms in the region and the necessity to take local traditions of the organization of the power into consideration are reflected. The reasons of O.A. Igelstrom’s reforms failure are revealed and discussed. The author studies the issue related to the authority and the influence of the khan’s power among the Kazakhs and the government measures on the restriction of this power. Attempts of the imperial government to manipulate with elections of new khans are described in the article. Reaction of the Kazakh elite on those actions is shown. The special attention is paid to the movement of Syrym Datov and to the way the Russian government took the advantage of this movement under various political circumstances. Winning round the Kazakh opposition and pushing it away under the changed circumstances, the Russian administration steadily solved one of the main political tasks to replace the elected head by a person or an institution loyal to the emperor and suitable for carrying out the requirements of the Russian regional administration. But it was impossible to solve the problem in the conditions of O. Igelstrom’s reforms. The way to achieve the desired goal was opened with M. Speransky’s reforms of 1820
Bipolar Pulse-Drive Electronics for a Josephson Arbitrary Waveform Synthesizer
No full textAJosephson arbitrary waveform synthesizer (JAWS) has been developed in order to generate quantum-based ac voltage signals. The key component of this JAWS is a modified commercial 30-Gb/s pattern generator that can generate ternary patterns (containing the values +1, 0, and ?1, resulting in bipolar pulses). The new pulse-drive electronics have been successfully tested by driving Josephson arrays with bipolar current pulses from 1 to 30 Gb/s in order to study their current–voltage characteristics and the spectra of the JAWS signals.Electrical Sustainable EnergyElectrical Engineering, Mathematics and Computer Scienc
Correction to: A Siamese transformer network for zero-shot ancient coin classification (Journal of Imaging, (2023), 9, 6, (107)
No full textJochen Büttner was not included as an author in the original publication [1]. The corrected Author Contributions statement appears here. Author Contributions: Conceptualization, J.B. (Siamese structure), Z.G. and O.A. (transformer components); methodology, Z.G., O.A. and Y.L.; software, Z.G. and Y.L.; investigation, Z.G. and D.R.; resources, Z.G. and O.A.; data curation, O.A.; writing—original draft preparation, Z.G., O.A., D.R. and Y.L.; writing—review and editing, Z.G. and O.A.; visualization, Z.G.; supervision, O.A.; project administration, O.A.; after initial publication, J.B. has agreed to be added as a co-author. All authors have read and agreed to the published version of the manuscript. The authors state that the scientific conclusions are unaffected. This correction was approved by the Academic Editor. The original publication has also been updated.</p
Nietvergeten.nl
No full textEen online systeem geschreven in o.a. PHP en beveiligd met o.a. SSL encryptie waarmee geregistreerde gebruikers persoonlijke informatie kunnen opslaan, samen met andere nuttige gegevens zoals paspoortnummer, rijbewijs, etc. Het inscannen en opslaan van belangrijke formulieren is ook mogelijk. Daarnaast kan men reminders instellen voor bepaalde gebeurtenissen.Electrical Engineering, Mathematics and Computer Scienc
Rationale for the Course “Basics of Anti-Doping Policy” in Physical Culture Education
No full textКлестова Оксана Александровна, кандидат педагогических наук, доцент, доцент кафедры
менеджмента и экономики в спорте, начальник учебно-методического управления, Уральский
государственный университет физической культуры, [email protected]. O.A. Klestova, [email protected]
Ural State University of Physical Culture, Chelyabinsk, Russian FederationРассмотрен один из аспектов проблемы подготовки специалистов для отрасли физической культуры и спорта в соответствии с требованиями работодателя. Автором определены политические, экономические, нормативные и иные основания для разработки и
введения в соответствии с запросом работодателя нового учебного курса. Отмечена целесообразность разработки дисциплины «Основы антидопингового обеспечения» для направления подготовки 49.03.01 «Физическая культура» с использованием требований
профессионального стандарта на основе его дополнения и конкретизации. The article describes one aspect of the problem of physical culture specialist training that
complies with the requirements of the employer. The author defined the political, economic, regulatory
and other reasons for the course development. The necessity of development of the subject
“Basics of Anti-Doping Policy” for the students getting degree in “Physical culture” is proven.
The author specified the educational requirements of the national education standard
Some Aspects of the Consequences of State Management on «Olympic Airways»
No full text«Olympic Airways» (O.A.) was founded by Onassis in 1956. The Greek State took over O.A. in 1975. The operation of O.A. was and still is based on the Contract that had been agreed between Onassis and the Greek State. The author proves that, although the State fulfilled the terms of the Contract completely while the company was privately owned, it stopped complying with many terms of the Contract since 1975, when O.A. became state owned. Furthermore, the State obliged O.A. to undertake the cost of some of its policies. The author estimates that, as a result of this conduct of the State, the total burden and loss of income of O.A. amounts to 544 millions the O.A. losses for whole period of state ownershi
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