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Diagnosis of stator shorted-turn faults in induction machines using discrete wavelet transform
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: OdunAyo Imoru --- Department of Electrical Engineering, South Africa M. Arun Bhaskar --- Department of Electrical Engineering, South Africa Adisa Abdul-Ganiyu Jimoh --- Department of Electrical Engineering, South Africa Yskandar Hamam --- Department of Electrical Engineering, South AfricaIncipient detection and diagnosis of stator winding shorted-turn faults in induction machines is essential for reliable and economical operations in industries. The problem of detecting shorted-turn faults in stator windings has been difficult. Although, from the supply currents, major winding... -
Stock separation of the shallow-water hake Merluccius capensis in the Benguela ecosystem using otolith shape analysis
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ENG Shoopala --- , Namibia MR Wilhelm --- , Namibia SC Paulus --- , NamibiaThe fishing industry is an important economic sector in Namibia and South Africa, with the shallow-water hake Merluccius capensis being an important target species. Recent genetic studies of M. capensis found two stocks in the Benguela Current Large Marine Ecosystem,... -
The role of oil price in determining the relationship between cryptocurrencies and non-fungible assets
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Omar Bani-Khalaf --- Rauf Denktas University, Nigar Taspinar --- Eastern Mediterranean University,This study aimed to explain the relationship between bitcoin and nonfungible tokens (NFTs) to determine if the NFT is an alternative investment to bitcoin or a complement during oil price uncertainty. The results showed a comovement between NFT and bitcoin... -
Pandemic impact on the co-movement and hedging effectiveness of the global futures markets
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Ahmad Danial Zainudin --- CIMB Investment Bank Malaysia, Malaysia Azhar Mohamad --- International Islamic University Malaysia, MalaysiaThis paper examines the impact of COVID-19 on five of the world's most liquid futures markets. The results of our wavelet coherence analysis for spot futures reveal two important findings. First, spot futures coherence movements during the pandemic period are... -
Time–frequency analysis of cryptocurrency attention
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Zuzana Kučerová --- VSB-Technical University of Ostrava, Czech Republic Svatopluk Kapounek --- Mendel University in Brno, Czech Republic Jarko Fidrmuc --- Mendel University in Brno, Czech RepublicWe present a wavelet analysis of retail investor attention and the daily returns of Bitcoin, Ethereum, and Litecoin at five selected crypto exchanges that identifies the fractal dynamics of the short- and long-term persistent processes. The investors’ attention is proxied... -
Examining the income gap-gender inequality nexus in Africa using bi-wavelet and partial wavelet coherence analysis
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Rasaq Raimi --- Nelson Mandela University, South Africa Andrew Phiri --- Nelson Mandela University, South AfricaThe eradication of gender discrimination traditions and the reduction of income disparities are vital global objectives outlined in Sustainable Development Goals 4 and 10, particularly in African nations where gender and income gaps persist. In alignment with these goals, this... -
Integration among the BRICS stock markets: Filtering out global factors
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Ayesha Sayed --- University of Cape Town, South Africa Ailie Charteris --- University of Cape Town, South AfricaDespite the prominence of the BRICS bloc, little attention has been given to their stock market co-movement. This study investigates the time- and frequency-varying integration of the BRICS stock markets including new BRICS + members with active markets. We explore whether market... -
A multiscale analysis of returns and volatility spillovers in cryptocurrency markets: A post-COVID perspective
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Andrew Phiri --- Nelson Mandela University, South Africa Izunna Anyikwa --- Nelson Mandela University, South AfricaSince the onset of the COVID-19 pandemic, leading cryptocurrencies have undergone significant price fluctuations, prompting widespread interest in the interdependence and spillover effects among cryptocurrency markets, as well as in identifying the key cryptocurrencies that drive market movements. This study... -
An efficient hybrid transform algorithm for image compression using a matrix rank-based optimization approach
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: D. Linett Sophia --- Erode Sengunthar Engineering College, India S. Kavitha --- Nandha Engineering College, IndiaThe digital images play a major part in variety of fields such medical, satellite, remote sensing, etc. Advancements in information technology have resulted in a huge number of digital images to be stored and transmitted. Since the demand for storage...