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Diagnostic Potential of Free-Space Radiometric Partial Discharge Measurements
No full textThe work reported in this paper addresses the calibration of four types of partial discharge (PD) emulator required for the development of a PD Wireless Sensor Network (WSN). Three partial discharge (PD) emulators have been constructed: a floating-electrode emulator, and two internal
PD emulators. Both DC and AC HV power supplies are used to initiate PD which is measured using concurrent free-space radiometry (FSR) and a galvanic contact method based on the IEC 60270 standard. A new method of estimating absolute PD activity level from a radiometric measurement is proposed
Full-Field 3D Shape Measurement of Specular Object Having Discontinuous Surfaces
No full textThis paper presents a novel Phase Measuring Deflectometry (PMD) method to measure specular
objects having discontinuous surfaces. A mathematical model is established to directly relate the absolute phase and depth, instead of the phase and gradient. Based on the model, a hardware measuring system has been set up, which consists of a precise translating stage, a projector, a diffuser and a camera. The stage locates the projector and the diffuser together to a known position during measurement. By using the model-based and machine vision methods, system calibration is accomplished to provide the required parameters and conditions. The verification tests are given to evaluate the effectiveness of the developed system. 3D (Three-Dimensional) shapes of a concave mirror and a monolithic multi-mirror array having multiple specular surfaces have been measured. Experimental results show that the proposed method can obtain 3D shape of specular objects having discontinuous surfaces effectively
Exploring Teachers’ Language Assessment Literacy: A Social Constructivist Approach to Understanding Effective Practices
No full textExploring teachers’ levels of assessment literacy in terms of their previous assessment experiences may help teacher educators to better understand the factors which promote or prevent effective assessment, thus contributing to more targeted and empowering teacher education. The research presented in this paper adopts a social constructivist model of learning and meaning-making, with the language classroom representing the community of practice. The first phase of the project consisted of interviews with teachers, in which they were invited to estimate their understanding of individual components of the assessment process and indicate how much they would like to learn about each. Classroom observations then took place followed by post-observation, reflective interviews. Finally, focus group discussions were conducted with further groups of experienced teachers. Four key findings are presented, highlighting the considerable differences in understanding which exist between teachers and those who research and write about language testing/assessment
Can Diet Help Non-Obese Individuals with Non-Alcoholic Fatty Liver Disease (NAFLD)?
No full textSubjects diagnosed with non-alcoholic fatty liver disease (NAFLD) or hepatic steatosis are usually obese or overweight. NAFLD has also been reported in many non-obese healthy subjects as an incidental finding during imaging. Subjects with early-stage NAFLD who are otherwise healthy are often left unmanaged in current clinical practice; it is not clear if an early intervention in those individuals would be of any benefit in preventing NAFLD progression to more serious conditions. Since many of these subjects are non-alcoholic and have a normal body mass index (BMI), an intensive lifestyle change program is not usually recommended. This report presents an otherwise healthy non-alcoholic subject with incidental NAFLD having a normal BMI and a waist circumference below 90 cm who successfully reversed his condition by undertaking a lifestyle intervention. The case report is expected to encourage large cohort studies to substantiate the benefits of dietary interventions in alleviating hepatic steatosis among non-obese individuals
Exploring Fashion Choice Criteria for Older Chinese Female Consumers: A Wardrobe Study Approach
No full textThis paper outlines a wardrobe study conducted within a larger research investigation that aims to examine the daily clothing choices and preferences of older female consumers in China to inform clothing design for this demographic. Based on inclusive design principles, the paper discusses the method and results of a wardrobe study designed to gather evidence of clothing preferences from 27 Chinese women aged between 55–70 years old. Four favourite casual outfits were selected by each participant from their own wardrobe. These were then photographed on the body and flat, with garment details recorded. The visual data from the wardrobe study was collated into a textual format enabling quantitative content analysis to be applied to find areas of commonality and divergence in participants’ choices regarding clothing design features, fabrics, fastenings and fit. The results of the study provide information that could assist in developing design guidelines for fashion designers and companies manufacturing clothing for ageing female Chinese consumers
Partial Discharge Localization Based on Received Signal Strength
No full textPartial Discharge (PD) occurs when insulation containing defects or voids is subject to high voltages. If left untreated PD can degrade insulation until, eventually, catastrophic insulation failure occurs. The detection of PD current pulses, however, can allow incipient insulation faults to be identified, located and repaired prior to plant failure. Wireless technology has paved the path for PD detection and monitoring. Software Defined Radio (SDR) is a promising technology. Signals from two PD sources are received at six outdoors locations using an SDR USRP N200 which is connected to a laptop. PD sources, thereafter, are localized based on received signal strengths
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