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Derivations on Functional (Local Banach) Algebras
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: A. KhosraviFirstly we obtain some of the general properties of functional (local Banach) algebras and secondly we generalize some of the known results of derivations on Banach algebras to such algebras. -
Derivations on ρ-banach Algebras
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Amir KhosraviLet A be a ρ-Banach algebra with radical R and let D be a derivation on A. We generalize Johnson's theorem, Sinclair's theorem and Thomas's theorem (Singer-Wermer's conjecture) to ρ-Banach algebras. If K = {x ∈ R: for every n... -
ON NEAR-RINGS WITH MATRIX UNITS
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Ravi Srinivasa Rao --- Department of Mathematics, IndiaIn ring theory it is well known that a ring R with identity is isomorphic to a matrix ring if and only if R has a set of matrix units. In this paper, the above result is extended to matrix... -
On the prime graph of Dn(q) where q ∊ {2, 5}
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Z. Akhlaghi --- Dept. of Pure Math., Faculty of Math. and Computer Sci, Iran M. Khatami --- Department of Mathematics, Iran B. Khosravi --- Dept. of Pure Math., Faculty of Math. and Computer Sci, IranLet G be a finite group. The prime graph Γ(G) of G is defined as follows. The vertices of Γ(G) are the primes dividing the order of G and two distinct vertices p, p′ are joined by an edge if... -
Yellow-bellied or white-bellied? Identity of Arabian house bats (Vespertilionidae: Scotophilus) revealed from mitochondrial DNA and morphology
Item type: Journal Article • Journal: African Zoology • Authors: Peter Vallo --- Institute of Vertebrate Biology, Academy of Sciences of the Czech Republic, Czech Republic Petr Benda --- Department of Zoology, Czech Republic Antonín Reiter --- South Moravian Museum in Znojmo, Czech RepublicThe yellow-bellied Scotophilus dinganii is the only African house bat species reported to occur in the Arabian Peninsula. Formerly, the Arabian house bats were referred to similar-looking white-bellied S. leucogaster, which differs from S. dinganii mainly by the colour of... -
Differentials of Light of Consciousness: An Interpretative Phenomenological Analysis of the Experience of Vihangam Yogis
Item type: Journal Article • Journal: Indo-Pacific Journal of Phenomenology • Authors: Ravi Prakash [B0001] Sujit Sarkhel [B0002] Priyanka Rastogi [B0003] Mohammed Zia Ul Haq [B0004] Pranav Prakash Choudharay [B0005] Vijay Verma [B0006]The Yogic literatures are replete with examples of several unique mystical experiences in deeper states of meditation. These experiences have nevertheless remained largely untouched by the scientific community, possibly because of the extreme inexplicability of such states and the lack... -
Expression of adhesion molecule epithelial cadherin and matrix metalloproteinase-9 in squamous neoplasia of the uterine cervix
Item type: Journal Article • Journal: Southern African Journal of Gynaecological Oncology • Authors: Julian Crasta --- Department of Pathology, India Gayatri Ravikumar --- Department of Pathology, India Sharon Koorse --- Department of Pathology, India Premalatha Siddharta --- Department of Gynaecological Oncology, India Elizabeth Vallikad --- Department of Gynaecological Oncology, IndiaBackground: The objective of the study was to evaluate the expression of cell adhesion molecules [epithelial cadherin (E-cadherin)] and extracellular matrix protease [matrix metalloproteinase (MMP)-9] in preinvasive and invasive lesions of squamous neoplasia of the uterine cervix. -
Palliative chemotherapy in recurrent carcinoma cervix: experience from a regional cancer centre in southern India
Item type: Journal Article • Journal: Southern African Journal of Gynaecological Oncology • Authors: Ravikiran Bonanthaya --- Department of Radiation Oncology, India KC Lakshmaiah --- Department of Medical Oncology, India Suresh Babu --- Department of Medical Oncology, India D Lokanatha --- Department of Medical Oncology, IndiaAims: To evaluate the clinical outcome and complications with two different palliative chemotherapy regimens in recurrent cervical carcinoma. -
Immunohistochemistry markers in diagnosing high-grade serous carcinoma of ovary with breast metastasis: a rare case report
Item type: Journal Article • Journal: Southern African Journal of Gynaecological Oncology • Authors: Thiraviyam Elumalai --- Department of Radiotherapy, India Ashutosh Mukherji --- Department of Radiotherapy, India Debasis Gochhait --- Department of Pathology, IndiaOvarian cancer patients presenting with breast metastasis are a rare phenomenon. Very few cases have been documented so far in the literature and have shown that long-term prognosis of these patients is poor despite intense chemotherapy schedules. This report discusses... -
Effects of exposure to an intensive HIV-prevention programme on behavioural changes among female sex workers in Nairobi, Kenya
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Ravi Prakash --- Karnataka Health Promotion Trust (KHPT), India Parinita Bhattacharjee --- Department of Community Health Sciences, Canada Andrea Blanchard --- Department of Community Health Sciences, Canada Helgar Musyoki --- National AIDS and STI Control Programme (NASCOP), Ministry of Health, Kenya John Anthony --- Department of Community Health Sciences, Canada Joshua Kimani --- Department of Community Health Sciences, Canada Gloria Gakii --- Partners for Health and Development in Africa (PHDA), Kenya Martin Sirengo --- National AIDS and STI Control Programme (NASCOP), Ministry of Health, Kenya Nicholas Muraguri --- Ministry of Health (MoH), Kenya Elizabeth Mziray --- The World Bank, USA Lombe Kasonde --- The World Bank, USA James Blanchard --- Department of Community Health Sciences, Canada Shajy Isac --- Department of Community Health Sciences, Canada Stephen Moses --- Department of Community Health Sciences, CanadaWhile Kenya has had a long-standing national HIV-prevention programme, evidence on the level of exposure to its interventions and related effects on behavioural changes among female sex workers (FSWs) is limited. Using cross-sectional behavioural data collected in 2013 from 1... -
The investment return puzzle on the Johannesburg Stock Exchange
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Pravin Semnarayan --- Gordon Institute of Business Science, University of Pretoria, South Africa Michael Ward --- Gordon Institute of Business Science, University of Pretoria, South Africa Chris Muller --- Gordon Institute of Business Science, University of Pretoria, South AfricaFirms that invest into positive net present value projects should outperform firms that do not invest. Surprisingly, several studies on United States data have found a negative relationship between capital investment and subsequent shareholder return. There are conflicting explanations for... -
The impact of educational attainment on household poverty in South Africa: A case study of Limpopo province
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Fru Awah Wanka --- Institute for Social Development, South Africa Ravinder Rena --- NWU Business School, South AfricaThe provision of education in South Africa during the apartheid regime was poor, particularly for the African population and especially those living in the homelands. This has hindered those lacking the required skills from obtaining lucrative employment and earning prospects... -
On certain properties and expansions of zeta matrix function, digamma matrix function and polygamma matrix function
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Ravi Dwivedi --- Department of Mathematics and Astronomy, India Vivek Sahai --- Department of Mathematics and Astronomy, IndiaWe introduce the generalized zeta matrix function, digamma matrix function and polygamma matrix function. We obtain the regions of convergence of these matrix functions, some recurrence relations and their integral representations. An identity involving hypergeometric matrix function 3F2 in the... -
A note on the Appell matrix functions
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Ravi Dwivedi --- Department of Mathematics and Astronomy, India Vivek Sahai --- Department of Mathematics and Astronomy, IndiaAppell matrix functions were studied in [4], assuming the commutativity of the considered matrices. In this paper, we extend this work to Appell matrix functions where not all the matrices involved are commuting matrices. We also revisit the matrix version... -
Music and identity in Inxeba (The Wound): the exploration and disruption of representations
Item type: Journal Article • Journal: Journal of the Musical Arts in Africa • Authors: Travis Mc Dowall --- , South AfricaThis article explores the complex and interwoven nature of the scored and traditional music featured in the film Inxeba (2017) in an attempt to bridge these seemingly disparate sound worlds. In identifying their significance to the film’s narrative and plot... -
Innovation activities of informal micro-enterprises in Gauteng, South Africa: A systematic review of the literature
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Lavhelesani Mulibana --- , Republic of South Africa Ravinder Rena --- , Republic of South AfricaThe literature revealed that 70–80% of South African small businesses, including informal micro-enterprises, fail in the first year of their existence. Innovation has been recognized as a catalyst that can enhance informal micro-enterprises’ probabilities to survive and transform them from... -
The role of leaders in building research cultures in sub-Saharan African universities: A six-nation study
Item type: Journal Article • Journal: Africa Journal of Management • Authors: Bill Buenar Puplampu --- , Ghana Stella Nkomo --- , South Africa Yvonne du Plessis --- , South Africa Jolly Byarugaba Kabagabe --- , Uganda Evelyn Chiyevo Garwe --- , Zimbabwe Juliana Namada --- , Kenya Kemi Ogunyemi --- , Nigeria Juliet Thondhlana --- , UK Inusah Abdul-Nasiru --- , Ghana Añulika Agina --- , Nigeria Kwesi Amponsah-Tawiah --- , Ghana Rosemary Danesi --- , Nigeria Justice Gameli Djokoto --- , Ghana Denise Diana Duncan --- , Ghana Joseph Lekunze --- , South Africa Simon McGrath --- , UK Joyce Ndegwa --- , Kenya Nancy Ngowa --- , Kenya Michael Ofori Ntow --- , Ghana Emily Ayieta Ondondo --- , Kenya Ravinder Rena --- , South Africa Maxwell Sandada --- , ZimbabweExisting research attributes the problem of weak research productivity of academics in African universities primarily to institutional resource poverty and inadequate research skills. However, there has been little attention to research cultures and the role of leaders in fostering productive... -
Establishing an understanding of the innovation process of informal micro-enterprises
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Lavhelesani Mulibana --- Gauteng Provincial Government, Republic of South Africa Ravinder Rena --- Durban University of Technology, Republic of South AfricaInnovation has been discerned as a catalyst that enables firms to remain relevant and sustainable. In recent years, the innovation discipline has been extended to the informal sector. Nonetheless, to date little is known about the process that is followed... -
Privilege: A critical inquiry
Item type: Journal Article • Journal: South African Journal of Philosophy • Authors: Chaitanya Joshi --- Narsee Monji Institute of Management Studies, India Sushruth Ravish --- IIT Kanpur, IndiaThe word “privilege” has become a part of our everyday conversations. However, it is not evident whether the various interlocutors in discussions on privilege are using it in the same sense. While different instances of privilege like white, male, or... -
Three Fibonacci-chain aperiodic algebras
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Raymond Aschheim --- Quantum Gravity Research, USA David Chester --- Quantum Gravity Research, USA Daniele Corradetti --- Universidade do Algarve, Portugal Klee Irwin --- Quantum Gravity Research, USAAperiodic algebras are infinite dimensional algebras with generators corresponding to an element of the aperiodic set. These algebras proved to be an useful tool in studying elementary excitations that can propagate in multilayered structures and in the construction of some... -
Huddling in the heat? Rarely seen thermoregulatory behaviours as Southern Pied Babblers Turdoides bicolor compete for cool microsites
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Amanda R Bourne --- University of Cape Town, South Africa Camilla Soravia --- The University of Western Australia, AustraliaHuddling is an important thermoregulatory behaviour used by many group-living endotherms to conserve energy during cold weather or periods of food scarcity. It is not typically considered a strategy for keeping cool during hot weather, largely because endotherms produce body... -
Characterizing some finite groups by the average order
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Z. Akhlaghi --- Amirkabir University of Technology (Tehran Polytechnic), Iran Behrooz Khosravi --- Amirkabir University of Technology (Tehran Polytechnic), Iran Ashkan ZareZadeh --- Amirkabir University of Technology (Tehran Polytechnic), IranThe average order of a finite group G is denoted by o(G). In this note, we classify groups whose average orders are less than o(S 4), where S 4 is the symmetric group on four elements. Moreover, we prove that... -
Firm size and enterprise productivity in Nigeria: Evidence from firm-level data
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Ambrose Nnaemeka Omeje --- University of Nigeria, Nigeria Augustine Jideofor Mba --- University of Nigeria, Nigeria Ravinder Rena --- Durban University of Technology, Republic of South AfricaAnchored on the economies of scale of production theory, this study utilized Nigeria’s firm-level enterprise survey data of the World Bank collected through stratified random sampling of 2 676 firms and face-to-face interviews with the application of the multinomial logit... -
Trends in ethical transgressions amongst South African dietetic practitioners
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: A Baldassarre --- Saint Louis University, USA M Pontarelli --- University of Texas MD Anderson Cancer Center, USA J Wilkenson --- University of the Western Cape, South Africa Y Gezu --- Augustana College, USA M Nortje --- Christopher Newport University, USA G Truong --- Skidmore College, USA N Ravi --- The University of Texas MD Anderson Cancer Center, USA N Nortje --- The University of Texas MD Anderson Cancer Center, USA WA Hoffmann --- Research Ethicist in Private Practice, The NetherlandsThis study investigated ethical transgressions amongst dietetic practitioners in South Africa, using publicly available data from the Health Professions Council of South Africa (HPCSA) in the period 2014–2023. The study is a follow-up on the study by Nortje and Hoffmann... -
Optimizing real-time stereo image retargeting for AR/VR: Lightweight disparity CNNs on AI-Driven edge architectures
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Mahendra T. Jagtap --- University of South Florida, Muma College of Business (Sarasota-Manatee Campus), USA Bhuvan Unhelkar --- University of South Florida, USA Pravin R. Kshirsagar --- JD College of Engineering and Management, India Nitin Rakesh --- Symbiosis Institute of Technology, India R. Thiagarajan --- VelTech multiTech Dr. Rangarajan Dr. Sakunthala Engineering College, India Vishal Patil --- Loknete Gopinathji Munde Institute of Engineering Education & Research, Nashik and SPPU, IndiaReal-time stereo image retargeting for augmented reality (AR) and virtual reality (VR) necessitates precise per-pixel depth estimation and ultra-low latency performance on resource-limited edge devices. Current disparity convolutional neural networks (CNNs) and retargeting pipelines are unable to meet these demanding... -
Bird community composition across a land use gradient in the eastern Democratic Republic of Congo
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Regine C Tabe Tiku --- Konrad Lorenz Institute of Ethology, University of Veterinary Medicine, Austria Samuel EI Jones --- Department of Biological Sciences, University of Cyprus, Cyprus Malange NF Elikwo --- Department of Microbiology and Parasitology, University of Buea, Cameroon Kowo Cyril --- Department of Microbiology and Parasitology, University of Buea, Cameroon Steve Ngoy --- Centre de Suiveillance de la Biodiversite, Universite de Kisangani, Democratic Republic of the Congo Virginia Zaunbrecher --- Center for Tropical Research, University of California, United States Ravinder NM Sehgal --- Department of Biology, San Francisco State University, United StatesCocoa agroforestry expansion is widespread in eastern Democratic Republic of Congo, posing a significant threat to the integrity of protected areas. Despite this threat, the impact of this expansion on forest bird communities remains largely unexamined. This study investigated bird...