Miracle-dz/UniFAR-FTUs huggingface dataset:
Condition assessment of circuit breakers using a trip coil profiling approach

This paper highlights the benefits of the technique known as coil profiling. The experience gained through extensive field trials are discussed, and the future strategy for the condition assessment of circuit breakers within Northern Ireland Electricity plc (NIE) is outlined. Coil profiling has provided a method which not only assists in the pin pointing of defects after failure, but can provide diagnostic information highlighting areas of potential failure which would otherwise have gone undetected. It is a technique which has proved both reliable and accurate and lends itself to a variety of maintenance strategies. There are many devices on the market which can record coil current profiles. This paper does not attempt to recommend a specific product, as the merits of each is dependant upon the strategy employed.
Vortex wakes behind high-lift wings

At high wing lift coefficients pertinent to STOL operation, the conventional neglect of vortex roll-up effects can lead to errors when calculating downwash at the tail plane and in the presence of ground or wind-tunnel walls. A classical unsteady treatment in the cross-flow plane, which calculates the roll-up of an initial spanwise row of point vortices, has been modified to allow for the influence of the wing. Additional meaning is thereby given to the streamwise length dimension and hence to aspect ratio and sweep. The effects of height-aboveground and of various tunnel heights and widths are discussed. Under certain limited conditions, notably with part-span flaps or too narrow a tunnel, part or all of the trailing vortex system may move upwards. Consequent changes in the vertical velocity field are additional to conventional estimates involving only the appropriate image system.
Experimental study of full-scale iced-airfoil aerodynamic performance using sub-scale simulations

Recent research in sub-scale ice accretion aerodynamic simulation and the current state of understanding in this area are reviewed. The flowfields and defining aerodynamic characteristics of the main types of ice accretion are discussed: ice roughness, streamwise ice, horn ice, and spanwise-ridge ice. Reynolds number effects are found to be small in many cases, but additional data are needed for certain types of accretion from Re = 2.0 x 10 – 5.0 x 10. Uncertainties in representing ice accretion geometry are substantial and in many cases may cause differences in aerodynamic performance on the order of the differences observed between a sub-scale simulation and the corresponding accretion. It is found that directly scaling roughness height on ice roughness, streamwise ice, and short-ridge ice simulations tends to produce conservative estimates of aerodynamic performance. Surface roughness is not usually necessary to accurately represent horn-ice simulations but improves the fidelity of tall-ridge simulations.
The detection of the closing moments of a vacuum circuit breaker by vibration analysis

The vibration signals during the closing operation of three-phase vacuum circuit breakers (VCBs) were recorded for detecting the closing moment of each pole. The short-time energy (STE) analysis of the vibration signals with a moving Hamming window is used to derive the closing moments both under no-load conditions and load conditions. By determining a proper length for the moving window, the improved signal-to-noise ratio by the STE analysis greatly facilitates the identification of the closing moments. Under no-load condition, the results obtained from the vibration signals are in good agreement with those measured by the contact timing signals. Under load conditions, it is found that the effect of the making current on the detection results is too tenuous to be neglected. This makes it possible to apply this method to online detection of the closing moments of VCBs.
Theoretical and experimental analysis for leakage rate and dynamic characteristics of herringbone-grooved liquid seals

In this paper, a theoretical analysis method for leakage rate and dynamic characteristics of herringbone-grooved liquid seals is proposed. Steady-state velocities and leakage rate are figured out first with the inertia term of the fluid combined with mass conservation within the seals. Subsequently, the rotordynamic coefficients are solved based on the investigation of Iwatsubo and Childs. Laboratory tests were performed on a specially designed test rig. Detailed comparisons between the experimental results and theoretical predictions show a good agreement on the leakage rate and hydraulic forces for five model seals, which provide an evidence of validation of the analysis method developed in this paper. Moreover, the influence of rotational speed and pressure difference on the leakage rate and rotordynamic coefficients of herringbone-grooved seals is discussed. The results show that the operating conditions and seal structures greatly influence the sealing and rotordynamic performances, which is helpful for designing herringbone-grooved seals.
Criteria for Comparing Domain Analysis Approaches Version 01.00.00

Abstract : Several of the Software Productivity Consortium's key technologies for process and reuse improvement incorporate domain analysis. However, the Consortium has three approaches to domain analysis associated with it, and these approaches differ in goals, end products, and processes. Lacking criteria for comparing the approaches, no one could justify using one approach over another. This has been something of a problem for Consortium projects looking to select an approach. Moreover, two of the approaches are still maturing; their architects need to know their strengths, weaknesses, and applicabilities if they are to become more useful. Member companies, who are increasingly interested in performing domain analysis, also need to know which approach to use. This report describes criteria for comparing domain analysis approaches. An organization can use them to determine if a domain analysis approach will meet their needs. To some degree, they also rank approaches in order of desirability. Domain analysis occurs in response to some need, so the Consortium looked for software development factors that dictate the suitability of a domain analysis approach for a given organization.
Pressure sensor based on a microstructure with dual silicon nitride vibrating beams

This paper describes a resonant pressure sensor of a new structure which comprises two beams supported by only two rectangular piers. Both beams can be thermally excited into resonant vibration, whose resonant frequencies are differentially modulated by pressure loads, and the value of the applied pressure can then be obtained by measuring the resonant frequency of each beam. With thick silicon rich SiN film of low residual stress as mechanical vibrating beams, the sensor is fabricated from a single crystal silicon wafer, using porous silicon as a sacrificial layer. Computer simulation is carried out on temperature distribution, resonant frequency shift due to thermal stress, design of diaphragm geometry, and sensitivity of pressure measurement. Simulation results show that the novel structure improves the thermal stability and pressure sensitivity.
Adaptation, integration and acculturation of foreign athletes in sports organizations in Romania and France

We live in an increasingly globalized and culturally diverse society, in which individuals with different cultural backgrounds, different education, different personalities and different values must work together and achieve optimal results. Moreover, these cultural differences are noticeable even within a group of people of the same nationality. At the same time, lately there are more and more bicultural individuals, who belong simultaneously to different cultures. Nowadays, sport has an enormous impact on society, being an extremely popular phenomenon on a global scale and which has become a business in which huge sums are spent. Sport can have both a unifying effect, bringing together different individuals, but at the same time it can emphasize cultural differences and deep ethnic differences. All these arguments justify the increased interest in multiculturalism in general, and in multiculturalism in sport in particular. Using SPSS software, this study proposes a quantitative comparative analysis of how the country in which athletes evolve, namely Romania and France, influences adaptation, self-confidence, team integration and market share of athletes.
Novel structural modeling and mesh moving techniques for advanced fluid–structure interaction simulation of wind turbines

In this paper, we target more advanced fluid–structure interaction (FSI) simulations of wind turbines than reported previously. For this, we illustrate how the recent advances in isogeometric analysis of thin structures may be used for efficient structural mechanics modeling of full wind turbine structures, including tower, nacelle, and blades. We consider both horizontal axis and vertical axis wind turbine designs. We enhance the sliding–interface formulation of aerodynamics, previously developed to handle flows about mechanical components in relative motion such as rotor–tower interaction to allow nonstationary sliding interfaces. To accommodate the nonstationary sliding interfaces, we propose a new mesh moving technique and present its mathematical formulation. The numerical examples include structural mechanics verification for the new offshore wind turbine blade design, FSI simulation of a horizontal axis wind turbine undergoing yawing motion as it turns into the wind and FSI simulation of a vertical axis wind turbine. The FSI simulations are performed at full scale and using realistic wind conditions and rotor speeds. Copyright © 2014 John Wiley & Sons, Ltd.
Calculation of inductance in permanent-magnet DC motors

The classical literature on DC motor design tends to focus on commutating inductance rather than total armature inductance, and does not provide a complete procedure for all the inductance calculations that are needed in permanent-magnet motors. The armature inductance is important, partly because of its effect on the electrical time constant, and partly because of its effect on the current waveform and torque when the motor is supplied from a phase-controlled converter or chopper. The inductance formulas needed in PM motors differ appreciably from those used with wound-field machines. The paper presents a comprehensive but concise account of the theory and computation of both the armature inductance and the commutating inductance in a form suitable for rapid computer calculation. In the armature inductance, new formulas for the airgap component are introduced and its importance is underlined by the fact that it accounts for about half the total inductance in several of the motors tested. This is an unexpected result, since the airgap component appears to have been overlooked in previous literature. Results are verified by experiment and finite-element analysis, and the paper describes the theoretical basis for the necessary connections to achieve the correct inductance by measurement.
Microstrip line directional couplers with high directivity

Novel uniplanar backward directional couplers are analysed and designed. Microstrip parallel coupled lines and asymmetrical delay lines enable a multi-sectioned coupler to enhance directivity as well as the coupling. Single and multi-sectioned couplers at 1.8 GHz have been designed and measured, providing excellent directivity.
Integration of a 1 MHz converter with active and passive stages

Integration of passive components, such as the planar LCT (inductor-capacitor-transformer) technology has been the subject of research over the last few years and has been proven to be viable at high frequencies, but no consideration was given to the rest of the converter. In this paper, the integration of these passive components and active components into a single hybrid converter is presented. From inception, the design process of each of these stages is directed by the nature of the other for the realization of an overall improved converter.
Fish-Eye Observing with Phased Array Radio Telescopes

The radio astronomical community is currently developing and building several new radio telescopes based on phased array technology. These telescopes provide a large field-of-view, that may in principle span a full hemisphere. This makes calibration and imaging very challenging tasks due to the complex source structures and direction dependent radio wave propagation effects. In this thesis, calibration and imaging methods are developed based on least squares estimation of instrument and source parameters. Monte Carlo simulations and actual observations with several prototype show that this model based approach provides statistically and computationally efficient solutions. The error analysis provides a rigorous mathematical framework to assess the imaging performance of current and future radio telescopes in terms of the effective noise, which is the combined effect of propagated calibration errors, noise in the data and source confusion.
Does An Orthodontic Functional Appliance Correct Head and Cervical Spine Posture

Class II malocclusion is one of the most common orthodontic problems, it is observed in one -third of the general population [1]. It is mostly diagnosed due to retrognathia of the mandibular. Functional appliances are considered orthodontic appliances that have dental, alveolar, and skeletal effects. It influences the patient’s facial skeletal component during growth. Orthodontic functional appliances are usually used to correct mandibular retrognathia accompanying skeletal class II malocclusion [2].
Mapping evidence of individuals’ sustainable consumption behaviour and energy or transport use in Africa: A scoping review

The study aims to systematically map and describe the evidence on individual’s sustainable consumption behaviour and energy and transport use in Africa. The paper employed Arskey and O’Malley’s’ framework of 2005 as a guide to conduct a scoping review. Using keywords separated by Boolean terms (AND/OR) with all limiters removed, relevant published studies in Science Direct, SCOPUS, and Google Scholar were searched. Full-text screening guided by the inclusion criteria was independently conducted and data extraction was done using a piloted form to ensure the accuracy and reliability of the data. The results revealed that out of 176 studies, six met this study’s inclusion criteria and were included for data extraction. Among the six included studies, two were multi-country studies involving African countries, and study each was conducted in Ghana, Mauritius, South Africa, and Egypt. Of the included studies, five were on sustainable energy consumption domain, one on energy use and recycling behaviour, and the factors influencing sustainable energy consumption; price, income, urbanization, intention, attitudes, subjective norms and personal values. However, we found no evidence on individual’s sustainable consumption behaviour and transport use. Concluding, the results suggest that limited studies on sustainable consumption behaviour of energy and transport use are found in Africa. Therefore, further studies are needed to protect the gains made so far on environmental sustainability as well as to encourage and improve the individual’s sustainable consumption practices.
EFFECT OF MACRO-ECONOMIC FACTORS ON FINANCIAL PERFORMANCE IN KENYA OF REGISTERED REAL ESTATE INVESTMENTS TRUSTS

Purpose: The purpose of the study was to determine the macroeconomic effect on Registered Real Estate Investments Trusts (REITs) financial performance in Kenya. Materials and Methods: Causal research design was used to describe the REITs financial performance. This study used the population comprising of thirteen REITs firms in Kenya. The entire population (census) was used for the study. This study utilized secondary sources of data to get the information required to satisfy the research objectives. Time series data on REITs financial performance was computed for a four-year period as at 1st January 2016 to 31stDecember 2019, thus making use of 4 data points. The process of data analysis entailed preparation of the collected data through cleaning, editing and coding so that statistics could be keyed in the SPSS (statistical package for social sciences) package. The data was presented through tables and figures Results: The regression model results without the moderating variable showed that R = 0.792, R² = 0.627 indicating that 62.7% of the variance in the REITs financial performance can be accounted for by the independent variables (macroeconomic variables). On the other hand, the regression model results with the moderating variable showed that R = 0.838, R² = 0.703 indicating that 70.3% of the variance in the REITs financial performance can be accounted for by the independent variables (macroeconomic variables) and the moderating variable considered in this study. Unique contribution to theory, practice and policy: The study recommended that the government and REITs stakeholders should focus on policies and strategies that encourage favorable balance of payment in Kenya. REITs develop and design their products to suit consumers tastes and preferences to ensure their increased as consumption increases. Lastly, the government should expand the money supply to lower the inflation rates through tight fiscal and economic policies.
Calibration Accuracy and Reconstruction Accuracy of Stereovision System

Error of stereovision reconstruction comes from feature extraction, correspondence and calibration. This paper is focused on investigation of the relation between reconstruction accuracy and calibration accuracy of a stereovision. A model of stereovision system is established, which consists of two cameras configured with their coordinate not paralleled. An array of points in the common view field of the two cameras is projected onto the image planes of the left and right cameras respectively and forms the left image and right image. After changing the calibration parameters of the stereovision system, including intrinsic parameters of the cameras and their relative position and pose, the array of points are reconstructed and compared with their original positions. The main factors affecting the reconstruction errors are discussed.
The effectiveness of decommissioning roadside mineral licks on reducing moose (Alces alces) activity near highways: implications for moose-vehicle collisions

Roadside mineral licks form when road salt used to de-ice highways in winter runs off road surfaces and accumulates in roadside ditches. Some ungulates are attracted to these roadside licks as they seek to satisfy their mineral requirements. Within the distribution of moose (Alces alces (Linnaeus, 1758)) in North America, motorists often encounter moose visiting roadside licks in mid-summer, with many jurisdictions reporting summer peaks in moose-vehicle collisions (MVCs) at these locations. Our research used camera traps to monitor moose visitation of 22 roadside locations (including roadside licks, roadside ponds, and dry roadsides) in central British Columbia, Canada from December 2009–July 2020, tested the efficacy of treatment (decommissioning) methods used to reduce moose visitation to roadside licks, and roughly estimated decommissioning costs. Moose visitation to roadside licks was greatest from May–July. As we hypothesized, untreated licks were visited more often by moose than decommissioned licks, roadside ponds (absent of road salt), and dry roadsides. Decommissioning roadside licks by replacing or mixing lick waters and soils with materials, such as riprap, cedar mulch, pine logs, or dog (Canis lupus familiaris (Linnaeus, 1758)) fur and human (Homo sapiens (Linnaeus, 1758)) hair, is an effective and inexpensive means of reducing moose visitations to roadside areas and should increase motorist safety where roadside licks are visited by moose.
MAXIMIZED GUST LOADS OF A CLOSED-LOOP, NONLINEAR AEROELASTIC SYSTEM USING NONLINEAR SYSTEMS THEORY

The problem of computing the maximized gust load for a nonlinear, closed-loop aeroelastic aircraft is discusses. The Volterra theory of nonlinear systems is applied in order to define a linearized system that provides a bounds on the response of the nonlinear system of interest. The method is applied to a simplified model of an Airbus A310.
Embracing Healthcare Delivery Challenges during a Pandemic. Review from a nodal designated COVID-19 center in Qatar

Hospitals and healthcare systems are instrumental in the formulation and delivery of a coordinated response to disaster management especially epidemics. In healthcare policy and strategy formation, there are only trade-offs, which with uncertainty are akin to gambles. National organizations play a key role in pandemics through the expression of physician motivation. Effective strategies can facilitate physician action through economies of scale that lower the costs for physicians to meet both community and patients' needs. Moreover, no matter how well clinicians are motivated and positioned to act, their collective actions are likely to fall short without complementary systems for population-based care that require the operational support of an organization. This review of institutional policy implementation and frameworks intends to highlight how a nodal-designated COVID-19 center in Qatar managed to control the menace by altering its procedural sets and work arrangements to augment an integrated, intrinsic response to a briskly emerging, conceivably complex situation. This outcome was achieved under the guidance of a national leadership team, effectively adapted to its specific challenges by building on current medical evidence, management routines, proficiencies, and health system capacity. This ambitious drive started with the cohesion of services and implementation of evidence-based protocols by assigning a physician-led team to research, strategize and organize improved patient flow and information by arranging analytical compliance and preparedness. Through these service approaches and ongoing efforts, HMGH has realized significant outcome improvements, such as increasing capacity building, reducing healthcare waste, and increasing patient satisfaction rates whilst successfully achieving significantly lower COVID-19 mortality both in terms of absolute numbers and as percent population compared to many developed countries in the world. The strategies outlined in this article might not be all-inclusive or fit other healthcare system models, but they generate a veritable interest to pursue and be subjected to further rigorous study.
Computer simulations of low noise states in a high-power crossed-field amplifier

A large body of experimental data has been accumulated over the past 15 years or so on the remarkable ability of both magnetrons and CFA's to operate under certain conditions at noise levels comparable to those achieved in linear beam tubes. SAIC's MASK code, a 2 1/2 -D particle-in-cell code, has been able to compute total, integrated noise power to an accuracy of /spl plusmn/ a few dB in a high-power CFA, operating with a typical intra-pulse spectral noise density of /spl sim/47-50 dB/MHz. Under conditions that produced low noise (/spl sim/60-100 dB/MHz) in laboratory experiments, the MASK code has been, until now, unable to reproduce similar results. The present paper reports the first successful production of a very low noise state in a CFA simulation using the MASK code. The onset of this low noise state is quite sudden, appearing abruptly as the current is raised to a point near which the cathode operates as nearly emission limited. This behavior is similar to that seen in an experimentally observed transition between low noise and high noise operation in the SFD-266, a Varian [CPI] low noise CFA. Some comments are made concerning the nature of the noise as observed in the simulation and in the laboratory.