858 research outputs found
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
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
Integration of High-Tc Superconducting Cables in the Dutch Power Grid of the Future
No full textWorldwide there is an increasing need for a more sustainable form of electrical power delivery with a growing share of renewable energy generation. In the distribution and transmission network, large-scale and small-scale wind and solar power plants will be introduced, in proportion to the annual economic growth. The transmission and distribution network will be expanded, focusing on the electricity transport, however, there will also be a need for exchanges with neighboring countries. Alternative solutions are needed in order to support the changes of the future grid. High temperature superconductors are an alternative to conventional conductors, due to their high current density and very low AC loss, and therefore deserve more attention. The purpose of this study is to explore ways to integrate high-temperature superconducting cables in a future network and to compare their favorable technical properties with, e.g., the conventional XLPE cable. The development of 2nd generation high temperature superconducting tapes results in a high tape quality, making it very attractive for use in superconducting power transmission cables. At the same time, the network requirements placed on the grid, based on society needs are changing, such as low magnetic field emissions, reducing space requirements, lower losses, minimizing visual intrusion, etc. Our study shows that superconducting cables compared to conventional cables score better on these societal requirements. From our comparison of three practical low and high temperature superconductors we can conclude that Yttrium Barium Copper Oxide is the most suitable superconductor for use in transmission cables. Our techno-economic analysis shows that superconducting cables become already competitive with conventional cable in the AC transmission, such as XLPE cables. Possible future problems concerning the transport capacity in the power grid where high temperature superconducting cables can offer a solution have been identified. For one promising location, we have formulated the requirements for the design of a high-temperature superconducting cable. Next, we propose two types of cable systems (with cold and warm dielectric). For both types we describe the core, the electrical insulation, the screen, the cryostat, the cooling system, etc. Also for the distribution grid a techno-economic investigation is conducted. To assess the feasibility of the application in distribution grids, we have experimentally demonstrated a reduction of AC conductor losses from 1 W/m to 0.1 W/m. We also carried out an experimental investigation to improve the developed cryostat design for a 6 km long cable connection. Despite these substantial technical improvements our economic study showed that the high-temperature superconducting distribution cable is not yet competitive with the present conventional distribution cable systems except for niche locations where additional advantages e.g. magnetic emission, reduced space usage, power density weighs more heavily. Besides the HVAC grid the Netherlands has HVDC interconnections with neighboring countries and there are initiatives for the use of DC high voltage connections to wind farms further out to sea. In our study, we make reference to a suitable location, where the above mentioned attractive features of the superconducting cable are applicable as well. We advised a modified design of a HTS HVDC cable which enables a possible upgrade of the transmission capacity of the HVDC link at such location. The main results from the investigation are that: \u95 Based on our techno-economic analysis HTS cables offer the most competitive solution in transmission grids. Introduction of such cables will reduce HTS tape price, which in turn will stimulate further applications. \u95 Conceptual designs of competitive HTS AC and DC transmission cables are formulated along with that for HTS AC distribution cable. Novel designs allow for much longer length between cooling stations. \u95 Our experimental research has shown that HTS cable core losses may be reduced by a factor 10 (down to 0.11 W/m/phase at 3 kArms, 77 K, 50 Hz). \u95 Dedicated low friction cable cryostat was developed and successfully tested for 47 meters length. Patented multi-layer thermal insulation improves the cable cryostat heat leak from 1 W/m to 0.1 W/m.Electrical Sustainable EnergyElectrical Engineering, Mathematics and Computer Scienc
Causes, Identification and Repair of loss of Common Ground in coordination in ATM (Air Traffic Management)
No full textOver a century has passed since humans took to commercial flying. Traditional safety practices have worked well but the last decade has seen the need for an updated understanding of ATM safety. The modern safety views are complementary to the traditional ones but are also a new way of understanding and enabling safety practices. This master thesis report presents a comprehensive review of the sources chosen from literature to better understand how a complex sociotechnical system, such as ATM, would operate. Certain selected coordination aspects will be the focus of this master thesis and will be used to model and analyse an ATM case. The ultimate aim of this research project is to add to the growing body of knowledge in the field of ATM safety, to make flying increasingly safer and to enable a complex system to be resilient.Aerospace EngineeringAir Transport Operation
Radar Doppler Polarimetry of Wind Turbines using the S-band PARSAX radar
No full textDue to the necessity of more sources of renewable wind generated energy, the number of wind turbines in the Netherlands has grown in the past. Unfortunately, big sizes and movements of the blades negatively impact ground-based Doppler radars in the form of Doppler clutter. Such clutter leads to a downgrade of the surveillance radar performance in airplanes and precipitation detection, their parameters estimation. Our goal is to characterize and possibly eliminate the Doppler clutter from the wind turbine, where polarization is used as an important tool to reach this goal. As Doppler frequency and polarization are key characteristics for this study, a theoretical model based on these characteristics is built to predict the behavior of the rotated rotor blades of the wind turbine which shows promising results for amplitude and phase analysis. To evaluate this model, real measurements have been done with the PARSAX radar, which gives possibility to represent the wind turbine data in Doppler-range domain or Doppler-time domain in terms of amplitudes and phases of all four elements of the polarization scattering matrix. Using orthogonal LFMwaveforms for simultaneous polarimetric measurements, despite of huge benefits, has one serious drawback a different residual phases in different polarimetric channels. Testing and analysis of a few algorithms, the use of zero Doppler frequency range profile of phases with different algorithms of phase unwrapping, for their estimation and compensation did not result, unfortunately, in reliable compensation of residual phases. As a result, the analysis of wind turbines clutter has been focused on analysis of amplitude polarization characteristics only. For an experimental study a wind turbine was selected, which is located in Zoeterwoude near a highway. Such location allows to observe scattering from wind turbine and automotive targets simultaneously at the same range distance, with the possibility of data comparison. The goal of data analysis is to find polarimetric features, which for both types of targets behave differently, there is a possibility to eliminate the clutter from the wind turbine only. For comparative analysis, the absolute terms of the averaged covariance matrix are used in terms of 2D histograms to find differences between the wind turbine and automotive targets. This is done for consecutive time frames, where the results show different and similar behavior depending on the time frame. Another approach is to obtain and compare the so called target Euler parameters, which are related to a physical of the specific target to extend our study, a few polarimetric decomposition techniques (Pauli and H/®) are used to study feasibility of targets classification. Using comparative analysis with the covariance matrix, shows great potential with correlation coefficient algorithms in combination with polarization. The results are promising, but vary as the correlation coefficient highly depends on the vehicle and the orientation angle of the blades. The results of direct estimation of Euler parameters and the H/® decomposition both show differences between vehicles and blades and therefore potential in distinguishing both targets. Though, the results are affected by the residual phase and therefore additional research is recommended on this problem for better reliability.Electrical Engineering - TelecommunicationMicrowave Sensing, Signals and SystemsElectrical Engineering, Mathematics and Computer Scienc
Agent-based Approach to Retrospective Analysis of Aviation Accidents
No full textAgent based modelling is a relatively new paradigm allowing to model the various components of the complex socio-technical air transportation system as well as the interactions between these components. Because situation awareness plays a key role in agent-based modelling, researchers at NLR had developed approaches in modelling Multi-Agent Situation Awareness (MASA) and MASA differences, including methods for their use in prospective safety risk analysis, i.e. to predict safety risk well ahead of an accident. The aim of the current research was to investigate how the combination of MASA and agent-based modelling can be used for retrospective safety analysis, i.e. to conduct an in-hindsight analysis of an accident occurrence. More specifically, the objective of this research was: To create a structured approach for retrospective modelling and analysis of an air transportation accident through a combined use of Multi-Agent Situation Awareness and agent-based modelling. The research showed that contributing factors to an accident can often be specified as MASA differences. This finding formed the basis for the development of a formal agent based approach to retrospective accident analysis. The working of this formal agent-based retrospective analysis approach has subsequently been demonstrated for three specific accidents from aviation history. Though information gathered from the occurrence database Skybrary, all relevant agents have been identified and their states and perceived states have been modelled at points where MASA differences are likely to occur. Finally the causation and propagation of MASA differences in the agent-based model are analysed. Based on the insights obtained from these analyses, it is concluded that a MASA and agent-based retrospective analysis of accidents yields new insights that are not obtained using a classical retrospective safety analysis.ATOAerospace Engineerin
Analysing Vessel Behaviour for Medium-Term Prediction of Vessel Collision Risk
No full textMaritime traffic has to deal with the risk of collision on a daily basis. Currently, Vessel Traffic Services Operators are provided with short-term prediction methods, used to resolve potential collisions. Research is done to predict collision risk at a larger time horizon, which is expected to provide a Vessel Traffic Services Operator (VTSO) with more time and information to anticipate upon and prevent situations with high risk of collision from developing. This thesis focusses on forming the basis for the prediction component of this goal. The objective is to provide a basic understanding of the process of medium-term behaviour of vessels. This is done by performing a data analysis of a case study of the vessel traffic off the coast of Rotterdam, investigating which variables can be used to predict the intent of a vessel. Two aspects of the intent of a vessel are considered: where the vessel intends to end (within the scope of the scene), and which intermediate waypoints it plans to follow. Entry points, exit points and waypoints are clustered using the Density Based Spatial Clustering of Applications with Noise (DBSCAN) clustering technique. Waypoints are derived by detecting change-points in the course of vessels using binary segmentation. Variables from the dataset are selected and it is investigated which variables can distinguish between different intents, given the entry point of the vessel. The results are that the variables 'course' and 'destination' can distinguish between routes sufficiently enough to investigate them further. This further investigation for the course variable is due to its dependence on vessel position, among other variables. Other variables may add value also, but then in combination with these two variables. The waypoint determination has not yet been successfully implemented, but it is regarded as a promising means to describe and predict vessel intent in more detail, partially due to the conclusions drawn regarding the course variable.Aerospace EngineeringControl & OperationsControl and OperationsAE531
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