127 research outputs found
Manoeuvring Through the Traffic Jam : A Conversation With Magnus Okeke About OkadaBooks and Digital Publishing in Nigeria
No full textOkadaBooks is an Android application and online platform for publishing and reading books electronically. It was founded by author and engineer Okechukwu Ofili and won mobile service provider MTN Nigeria's App of the Year Award (2013) in the category Best Overall App' (Osuagwu). At the time of writing, OkadaBooks offer their users more than 200 000 titles which have been downloaded more than one million times. OkadaBooks content ranges from novels and poetry to contemporary African comics, self-help literature and children's literature. The newer material is to a large extent written by non-established writers who use the app as a way to reach readers rather than to earn money by letting the reader access their texts for free. Other writers' books can be purchased through the app using a variety of payment methods. This interview with Magnus Okeke was done via email in September 2018, five years after the launch of OkadaBooks. Okeke became OkadaBooks's first employee at the end of 2014. He leads what he calls a proactive customer support team' who assist customers via phone, email, playstore and other channels. Okeke has studied computer science at Yaba College of Technology in Lagos, Nigeria, and is currently studying to become a product manager.</p
Parallel session 11 : Teaching and learning innovations
No full textPresented Titles: Students\u27 Remote Learning Experiences a Time of Pandemic [Authors: Loretta Anthony-Okeke; Heather Cockayne] Panorama (Scale and Scope) of Chinese Education Recruitment Agents (CERAs): A Mapping Exercise [Authors: Cassie M. Zhang; Tatiana Fumasoli] Understanding School Teachers’ Perspectives about their Changing Role of Teaching Amid COVID-19 in Northern Pakistan [Author: Abdul Wali Khan] The Geopolitics of Innovation: The Digitalisation of the Post-Pandemic Higher Education Landscape [Author: Eva Hartmann] The Digital Classroom as Empathic Space: Thinking through Pedagogic Objectives in the COVID times [Author: Manasi Thapliyal Navani
Prevalence of depression among health workers in Enugu, South East Nigeria
No full textAims: Determination of the prevalence and distribution of depression among health workers at tertiary level of health care delivery in Enugu South East Nigeria. Settings and Design: A cross‑sectional descriptive survey of depression in health workers at tertiary level.Subjects and Methods: By proportional quota sampling, the sample size of 309 was used. Ethical issues were given full consideration. A structured self‑administered questionnaire including the Zung self‑rating depression scale was used to collect data.Statistical Analysis Used: Data entry and analysis were done using SPSS statistical package version 15. Statistical significance was considered present when P < 0.05.Results: The total of 46 of the 309 workers (14.9%) were found to be depressed. Of the health workers found to be depressed, there were more females (18.0%) than males (8.7%). A feeling of sadness over family, living and working conditions was more consistent among the depressed.Conclusions: The condition of depression is present among health workers in this part of the world. Being a female health worker, may be associated with depression in South East Nigeria. Studies to investigate the determinants and effects of depression in the Nigerian health work force are necessary.Key words: Depression, health workers, prevalenceErratum published for this article here: https://www.ajol.info/index.php/njcp/article/view/158260In the article, “Prevalence of depression among health workers in Enugu, South East Nigeria”, which appeared in the pages 342-347, issue 3, vol. 18 of Nigerian Journal of Clinical Practice,[1] the name of the third author and his affiliation is missing. The third author name is “Anne Chigedu Ndu” and the affiliation is “Department of Community Medicine, College of Medicine, University of Nigeria Enugu Campus, Enugu, Nigeria”.The “How to cite this article” section information is written incorrectly and should read as “Obi IE, Aniebue PN, Ndu AC, Okonkwo KOB, Okeke TA, Ugwunna NCW. Prevalence of depression among health workers in Enugu, South East Nigeria. Niger J Clin Pract 2015;18:342-7
The Influence of Network Topology on the Operational Performance of the Low Voltage Grid
No full textThe present Low Voltage (LV) grid, which until recently was mainly composed of passive electrical components (consumers), is being gradually overrun by active electrical components (prosumers), who not only consume but also generate and share power locally. This development is introducing changes in the operational dynamics of the LV grid that could result in voltage stability problems and the violation of infrastructural constraints if not well managed. A re-design of the present LV grid is, therefore, imperative to enable it meet these new requirements. This thesis was aimed at studying the influence of topological metrics on the operational performance of the LV grid in view of current developments in energy consumer behaviour with a view to proposing the topological changes and/or modifications in network architecture that would yield optimal outcomes. We modelled the present LV grid as a radial network, and compared it to three other network models -random, small-world and scale-free networks- under different loading scenarios. We proposed novel structural and operational metrics that are suitable for the LV grid, and analysed the networks in terms of these metrics. We also compared their robustness under different attack scenarios and demonstrated the correlation between the structural and the operational metrics, thus, identifying important structural metrics that need to be optimized to improve the future LV grid performance. Finally, we then investigated the possible modifications of the radial network model of the present LV grid that would yield similar results. The results highlighted the structural weaknesses of the present LV grid under futuristic and simultaneous loading conditions and presented the scale-free model as the most suitable architecture for the future LV grid as it out-performed all the other network models under similar loading conditions. They also showed that the insertion of additional links at critical positions in the radial network could achieve similar results. We therefore proposed this structural modification as a more cost-effective approach to improved operational performance of the LV grid.Network Architectures and ServicesComputer EngineeringElectrical Engineering, Mathematics and Computer Scienc
Erratum: Prevalence of depression among health workers in Enugu, South East Nigeria
No full textErratumIn the article titled “Prevalence of depression among health workers in Enugu, South East Nigeria”, published onpages 342-347, Issue 3, Volume 18 of Nigerian Journal of Clinical Practice[1], the list of authors, one author name isomitted "Ndu Anne Chigedu".The correct list of authors and their affiliations should read as:OI Emmanuel, AP Nonye, NA Chigedu, OOB Kevin1, AO Theodora, NCW Ugwunna.Departments of Community Medicine and 1Psychological Medicine, College of Medicine, University of NigeriaEnugu Campus, Enugu, NigeriaThe “How to cite this article” section should read correctly as “Obi IE, Aniebue PN, Ndu AC, Okonkwo K,Okeke TA, Ugwunna N”.Reference1. Original reference with adding author names.DOI: 10.4103/1119-3077.250524 PMID
Desensitization of cAMP accumulation via human β3-adrenoceptors expressed in human embryonic kidney cells by full, partial, and biased agonists
No full textβ3-Adrenoceptors couple not only to cAMP formation but, at least in some cell types, also to alternative signaling pathways such as phosphorylation of extracellular signal-regulated kinase (ERK). β3-Adrenoceptor agonists are used in long-term symptomatic treatment of the overactive bladder syndrome; it is only poorly understood which signaling pathway mediates the clinical response and whether it undergoes agonist-induced desensitization. Therefore, we used human embryonic kidney cells stably transfected with human β3-adrenoceptors to compare coupling of ligands with various degrees of efficacy, including biased agonists, to cAMP formation and ERK phosphorylation, particularly regarding desensitization. Ligands stimulated cAMP formation with a numerical rank order of isoprenaline ≥ L 755,507 ≥ CL 316,243 > solabegron > SR 59,230 > L 748,337. Except for the weakest agonist, L 748,337, pretreatment with any ligand reduced cAMP responses to freshly added isoprenaline or forskolin to a similar extent. On the other hand, we were unable to detect ERK phosphorylation despite testing a wide variation of conditions. We conclude that a minor degree of efficacy for cAMP formation may be sufficient to induced full desensitization of that response. Transfected human embryonic kidney cells are not suitable to study desensitization of ERK phosphorylation by β3-adrenoceptor stimulation. Copyright © 2019 Okeke, Michel-Reher, Gravas and Michel. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms
Divining without seeds : the case for strengthening laboratory medicine in Africa
No full textA book that makes the case for strengthening laboratory diagnosis in Africa. --author-supplied descriptio
From autonomy to independence : the challenges of nation-building in South Sudan.
No full textPh. D. University of KwaZulu-Natal, Pietermaritzburg 2014.This study explores the dynamic process of the now Republic of South Sudan‘s achievement of independence after years of autonomy, with a focus on the challenges confronting nation-building efforts in the world‘s youngest nation. The author has a special interest in the study because of his direct involvement in the struggle for external self-determination in his Homeland, the former Barotseland. He followed the events prior to, during and after South Sudan‘s independence with close interest. The hope of attaining independence endured for decades, even when the country was in the grip of one of the most disastrous civil wars. Despite immense challenges and setbacks, South Sudan has managed to rise from the dust of civil war and the limitations of a contradictory autonomy to a new dawn as an independent state. The purpose of this study is fourfold. First, it examines recent national and international processes that contributed to the making of the world‘s youngest country, the Republic of South Sudan, grounding the discussion on the nation-building theory. Secondly, the study provides a case study analysis of other African and Asian nations that have undergone similar or near-similar nation-building processes. Thirdly, through an empirical investigation using primary data, the study identifies the challenges confronting South Sudan in its nation-building quest, and considers the country‘s future prospects. Finally, based on the available literature, the study makes a number of recommendations regarding the challenges facing this young, troubled, yet promising nation
Review of Tanisha Ford’s Liberated Threads: The Unifying Thread among Black Female Activists in the Diaspora
No full textIn Liberated Threads: Black Women, Style, and the Global Politics of Soul (2017), author
Tanisha Ford examines how black women in the latter half of the twentieth century used fashion
as a means of protest. In conversations about politics and activism, topics such as government
policies and state structures often arise, but rarely that of fashion. Although fashion and politics
are often thought to exist separately from one another, Ford proves that the two are intertwined
and highlights how black women used clothing in the soul era as a political statement to further
advance their views on equality
Improving the structure, tensile strength and hardness of molybdenum-doped copper-silicon alloy system
No full textAbstract: Cu-Be alloys are known for their outstanding strength, hardness, and electrical conductivity. They are often used in applications where high performance is required, such as aerospace, electronics, and telecommunications. One significant drawback of Cu-Be alloys is that beryllium is toxic and poses health risks, especially during the manufacturing and machining processes. This has led to concerns about worker safety and environmental impact. In this study, novel Cu-Si-Mo ternary alloys composition with improved tensile strength, ductility, and hardness are produced. The Cu-3Si-xMo (x: 0.1-5 wt%) alloys were fabricated via stir-casting technique. The surface morphologies of the Cu-Si and Cu-Si-Mo alloys were investigated and linked with the mechanical properties using optical metallurgical microscope (OM). Results of the study indicated that tensile strength, ductility, and hardness of the parent alloy improved significantly, recording maximum values of 130 MPa, 18.4%, and 192 BHN, respectively. Alloy with composition; Cu-3Si-1.5Mo gave the best mechanical properties, owing to increased solid solution strengthening, modification, and refinement of the dendritic grains by molybdenum addition.
Keywords: Strength, hardness; morphology; Cu-Si-Mo alloy; composition.
Title: Improving the structure, tensile strength and hardness of molybdenum-doped copper-silicon alloy system
Author: Agatha Ifeoma Ijomah, Kingsley Chidi Nnakwo, Jerome Ugwu Odo, Ifeanacho Uchenna Okeke
International Journal of Mechanical and Industrial Technology
ISSN 2348-7593 (Online)
Vol. 11, Issue 1, April 2023 - September 2023
Page No: 54-59
Research Publish Journals
Website: www.researchpublish.com
Published Date: 15-September-2023
DOI: https://doi.org/10.5281/zenodo.8348223
Paper Download Link (Source)
https://www.researchpublish.com/papers/improving-the-structure-tensile-strength-and-hardness-of-molybdenum-doped-copper-silicon-alloy-systemInternational Journal of Mechanical and Industrial Technology, ISSN 2348-7593 (Online), Research Publish Journals, Website: www.researchpublish.co
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