Browsing Conference Papers by Title
Now showing items 532-551 of 799
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Observation of the extremely bright flare of the FSRQ 3C279 with H.E.S.S. II
(PoS, 2017)In June 2015, the Flat Spectrum Radio Quasar 3C 279 underwent an extremely bright gamma-ray flare, with an increase of the flux above 100 MeV by a factor 10 in less than 1 day, revealing an intrinsic variability timescale ... -
Observations and modeling of gamma-ray millisecond pulsars seen with the Fermi LAT
(AIPC, 2011)We present a summary of gamma-ray millisecond pulsar (MSP) observations with the Fermi Large Area Telescope. The radio and gamma-ray light curves of these MSPs have been modeled in the framework of the retarded vacuum ... -
Observations of the blazar PKS 2023-07 in flaring state with H.E.S.S. And Fermi-LAT in 2016-2017 and constraints on an intrinsic cut-off
(Sissa Medialab, 2019)PKS 2023−07 is a flat spectrum radio quasar located at a redshift z = 1.388, farther than any source currently detected at very high energies (E > 100 GeV). At such energies, absorption by the extragalactic background ... -
Observations of the flaring Fermi-LAT blazars and prospects in spectro-polarimetry with SALT-RSS
(HEASA, 2016)The Fermi Gamma-Ray Space telescope has identified 1741 active galactic nuclei during its first four years of observation (2008-2012) and detected 1145 blazars and 573 blazar candidates of uncertain type (BCUs) as listed ... -
Off Line Partial Discharge as an essential Condition Based Monitoring (CBM) Tool for busbar insulation monitoring on Air Insulated Switchgear (AIS)
(NWU, 2018)This paper investigates the effectiveness of current test methods and procedures associated with insulation testing on the busbar of Air Insulated Switchgear (AIS) during scheduled planned maintenance. An improved test ... -
On the assessment of harmonic emission in distribution networks: opportunity for the prevailing harmonic phase angle
(IEEE, 2016)Harmonic emission assessment for Grid Code compliance of Renewable Power Plants (RPP) has to be fair and pragmatic. The CIGRE C4.109 method lacks the ability to determine which harmonic currents have a positive or negative ... -
On the assessment of voltage unbalance
(IEEE, 2010)The management of voltage unbalance in a power system is supported by the knowledge on the contribution of a single unbalanced load/source to the total level of voltage unbalance observed at a Point of Common Coupling (PCC) ... -
On the development of a power quality benchmarking model
(IEEE, 2009)The development of a Power Quality (PQ) Benchmarking model is presented. Practical results are discussed to motivate the need of adding value to recorded PQ data by means of benchmarking PQ performance. The importance, ... -
On the financial interpretation of risk contributions: an analysis using Quantile Simulation
(Taylor & Francis, 2019)This paper tests whether the financial interpretation of risk contributions (Qian, 2006), as measured by marginal change in volatility, holds when accounting for fat tails in the asset return distributions. This important ... -
On the remote calibration of voltage transformers: validation of opportunity
(IEEE, 2018)Remote calibration of instrument transformers seems possible if sufficient certainty in field measurements can be achieved. This opportunity, until now, was only investigated from a theoretical point of view and in this ... -
On the reporting of power quality
(IEEE, 2011)The reporting of power quality (PQ) requires consideration as different users of information on Quality of Supply (QoS) have different needs. Reporting on the compliancy of voltage regulation in terms of a PQ standard can ... -
On the underlying particles in the jet of 3C 279
(PoS, 2017)Recent high-energy missions have allowed keeping watch over blazars in flaring states, which provide deep insights into the engine powered by supermassive black holes. However, having a blazar caught in a very bright ... -
On-line performance monitoring of a transmission line using synchrophasor measurements
(IEEE, 2015)Synchrophasors are increasingly being implemented to improve the understanding of network performance. This paper presents the use of voltage and current synchrophasors in the on-line performance monitoring of a transmission ... -
Ontology goes postmodern in ICT
(ACM Press, 2010)This paper investigates the move from philosophical ontology to information systems ontologies. Ontology has traditionally been (and still is) a philosophical discipline that studies the nature of existence. In a certain ... -
An ontology-driven software development framework
(2010)The software development process has been curtailed by the lack of a methodology that can capture and maintain the softer, humanist characteristics of organizational systems into the software product. This is attributed ... -
Ontwerp van 'n energiebestuurstelsel vir optimale energieverbruik en effektiwiteit van 'n distribusievlakmikrokragnetwerk
(2014)South African state-owned utility company, Eskom, is under severe pressure to ensure the stability and reliability of the national electricity grid. With a shortfall in capacity of the national electricity grid, the ... -
Ontwerp van ’n transmissielyn-monteringsoplossing vir ’n onbemande vier-rotor helikopter
(AOSIS, 2014)A need exists for a transmission line monitoring system for use by Eskom to inspect transmission lines. A solution which uses a single board computer, visual and infrared cameras and a GPS module is described. Real-time ... -
Operational advantages of mobile refrigeration using a closed loop heat rejection configuration
(2018)The operational advantages of localised cooling, in particular moving the cooling source as close as possible to the area where cooling is required, has been investigated by different authors over a number of years. ... -
Optical variability modelling of newly identified blazars and blazar candidates behind Magellanic clouds
(Sissa Medialab, 2019)We present results of a variability study in the optical band of 44 newly identified blazar candidates behind the Magellanic Clouds. Our sample contains 27 flat spectrum radio quasars (FSRQs) and 17 BL Lacertae objects (BL ... -
Optimal passive optical network planning under demand uncertainty
(SATNAC, 2014)As a result of ever-increasing demand for access level bandwidth, long deployment cycles and the popularisation of more economically viable Point-to-Multipoint (P2MP) networks, service providers are moving to extensively ...
