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Article
Publication date: 1 January 2007

O.O. Adejumo and J.O. Ojo

The results of trial experiments carried out with a computer simulation model of total reflection X‐ray fluorescence, TXRF system to determine optimum conditions for…

Abstract

The results of trial experiments carried out with a computer simulation model of total reflection X‐ray fluorescence, TXRF system to determine optimum conditions for detecting certain elements of interest under various analytical conditions in a given ten‐element standard sample is presented in this paper. Results of these trial experiments show that the detectability of elements improved with increasing applied voltages up to about 43kV (for a Molybdenum anode TXRF spectrometer) and atomic number of elements. Variation of geometry such as the glancing incidence angle of the excitation beam reflected slight increase in minimum detection limit, MDL values as the angle of incidence is reduced from an optimum value of 1.6mradian to 1.0mradian. The nature of the sample support was observed to affect the detectability of the elements as good detection limits were obtained if gold is used as sample holder..

Details

Multidiscipline Modeling in Materials and Structures, vol. 3 no. 1
Type: Research Article
ISSN: 1573-6105

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Book part
Publication date: 14 December 2020

Ngozi Ann Chikere, Adenike Aderonke Moradeyo and Isaiah Adisa

The Igbos of south-eastern region of Nigeria are known for their rich cultural heritage which permeates all their socioeconomic life. Sacrosanct among their social…

Abstract

The Igbos of south-eastern region of Nigeria are known for their rich cultural heritage which permeates all their socioeconomic life. Sacrosanct among their social institution is their business practice which has outlived generations, but its impact is still felt not only in the south-eastern region but also in Nigeria as a whole. Igbo business practices have become integral to an average Igbo man's life, and it is the cornerstone on which their values are promoted. This is evidence in their desires to make wealth and be successful hence the adage ‘ego ji oru’ which means ‘money has the answer to projects’. Generally, Igbo culture and values are reflected in their business practices. The Igbos have a strategic model of attracting, retaining, transferring knowledge and developing talents. This unique model has contributed to the sustenance of Igbo businesses through manpower development and has also influenced their business performance over the years. The Igbos seek and develop talents in their area of business interest for continuity, performance and value creation. This chapter explores how talents are recruited to become apprentices and how knowledge is transferred to these apprentices by their Igbo master known as ‘oga’. Also, the effects of the recruitment process and the knowledge transfer mechanisms on business performance are evaluated. The chapter adopts a case study approach and sampled six small Igbo businesses in Ajah market, Lagos. The chapter revealed that the Igbos have indigenous strategies of recruiting and developing talents which influence the performance of their business. Informed recommendations were made for business in Africa at the end of the chapter.

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Article
Publication date: 8 May 2018

Koosha Choobdari Omran and Ali Mosallanejad

Double rotor induction machine (DRIM) is a particular type of induction machine (IM) that has been introduced to improve the parameters of the conventional IM. The purpose…

Abstract

Purpose

Double rotor induction machine (DRIM) is a particular type of induction machine (IM) that has been introduced to improve the parameters of the conventional IM. The purpose of this study is to propose a dynamic model of the DRIM under saturated and unsaturated conditions by using the equations obtained in this paper. Also, skin and temperature effects are considered in this model.

Design/methodology/approach

First, the DRIM structure and its performance will be briefly reviewed. Then, to realize the DRIM model, the mathematical equations of the electrical and mechanical part of the DRIM will be presented by state equations in the q-d axis by using the Park transformation. In this paper, the magnetizing fluxes saturation is included in the DRIM model by considering the difference between the amplitudes of the unsaturated and saturated magnetizing fluxes. The skin and temperature effects are also considered in this model by correcting the rotor and stator resistances values during operation.

Findings

To evaluate the effects of the saturation and skin effects on DRIM performance and validate the model, the machine is simulated with/without consideration of saturation and skin effects by the proposed model. Then, the results, including torque, speed, stator and rotor currents, active and reactive power, efficiency, power factor and torque-speed characteristic, are compared. In addition, the performance of the DRIM has been investigated at different speed conditions and load variations. The proposed model is developed in Matlab/Simulink for the sake of validation.

Originality/value

This paper presents an understandable model of DRIM with and without saturation, which can be used to analyze the steady-state and transient behavior of the motor in different situations.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 37 no. 3
Type: Research Article
ISSN: 0332-1649

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Article
Publication date: 1 March 2007

Joshua O Dada and G O Jagboro

One of the major reasons for ineffective project delivery in the Nigerian construction industry is the improper assessment of risk factors. As a result, the industry…

Abstract

One of the major reasons for ineffective project delivery in the Nigerian construction industry is the improper assessment of risk factors. As a result, the industry continues to suffer poor performance with many projects failing to meet time and cost targets. This paper identifies the risk factors inherent in different building procurement methods and assesses their perceived relative importance with a view to evaluating their impact on project cost. The paper reports on a study carried out through a questionnaire survey of professionals within the construction industry in order to asses the relative importance placed on risk factors. Responses from the survey were analysed using relative importance index for the purpose of evaluating the impact of risk on projects cost. Data were collected on selected completed projects and analysed using frequencies, mean values and relative important index. The main risk factors identified are finance and political influence. A model was developed by relating the variation between the initial contract estimate and the actual project cost to the risk variables. From the analysis, the percentages of projects cost overrun due to the impact of risk were established for each procurement method investigated. The paper recommends that contingency additions should be based on the procurement method used.

Details

Journal of Financial Management of Property and Construction, vol. 12 no. 1
Type: Research Article
ISSN: 1366-4387

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Article
Publication date: 1 January 2004

Olaonipekun Henry Olabode

Development runs on a continuum, having traditional, transitional and desired (relative) development stages. Rather than moving on, the continent of Africa has remained…

Abstract

Development runs on a continuum, having traditional, transitional and desired (relative) development stages. Rather than moving on, the continent of Africa has remained perpetually transitional due to its inability to strategically position itself globally, and its attendant international maneuvers; as well as its inability to break away from the anti‐development traits of the traditional stage of development and launch into the future. This, has invariably resulted in a ‘Departure‐Arrival’ (from one stage of development to another) crises, and distractions, confusions, and uncertainties, which now pervade the development terrain of Africa.

Details

International Journal of Development Issues, vol. 3 no. 1
Type: Research Article
ISSN: 1446-8956

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Book part
Publication date: 14 December 2020

Chidi Okoro and Nkemdilim Iheanachor

This chapter aims to highlight talent management approaches and succession planning principles deployed by traditional Igbo businesses in Nigeria. Insights came from…

Abstract

This chapter aims to highlight talent management approaches and succession planning principles deployed by traditional Igbo businesses in Nigeria. Insights came from interviews of a purposively selected sample of Igbo businesses drawn from different sectors of the Nigerian economy and different geopolitical zones of the country to give a national representation of the approaches they deploy in talent management and succession planning.

The chapter commences with a brief literature review of talent management and then proceeds to indicate the methodology deployed in data collection, analysis and presentation. The next section presents findings in detail on how Igbo businesses embark on talent management activities such as talent identification and attraction; interviewing; talent assessment; apprenticeships; training; risk considerations; compensation and rewards. Some training areas discussed in detail include nature of the sector, customer service, inventory management, supplier management and cash handling. The subsequent section highlights some challenges with talent management and approaches Igbo businesses adopted in overcoming them.

The chapter also provides some insights as cases of approaches traditional Igbo businesses adopted in succession planning – this gives more perspective on the contextual circumstances that inform the strategies the businesses adopted in talent management. The chapter concludes by discussing in general, succession planning approaches deployed by traditional Igbo businesses.

Details

Indigenous African Enterprise
Type: Book
ISBN: 978-1-83909-033-2

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Book part
Publication date: 29 July 2019

Bruno S. Sergi, Elena G. Popkova, Anastasia A. Sozinova and Olga V. Fetisova

This chapter models industrial, tech, and financial cooperation between Russia and the countries of the Asia-Pacific region. We use several complex methods of economic and…

Abstract

This chapter models industrial, tech, and financial cooperation between Russia and the countries of the Asia-Pacific region. We use several complex methods of economic and mathematical modeling to analyze specific features of such cooperation and determine critical factors in industrial, technological, and financial development. The preferable choice for the Asia-Pacific region is cooperation with Russia, which is ready for an increase in imports of industrial and high-tech products as well as joint industrial innovational entrepreneurship. Investments would lead to synergetic effects, ensuring simultaneous industrial, technological, and financial development.

Details

Tech, Smart Cities, and Regional Development in Contemporary Russia
Type: Book
ISBN: 978-1-78973-881-0

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Article
Publication date: 18 December 2020

Stephanie Petty, Amanda Griffiths, Donna Maria Coleston and Tom Dening

Improving hospital care for people with dementia is a well-established priority. There is limited research evidence to guide nursing staff in delivering person-centred…

Abstract

Purpose

Improving hospital care for people with dementia is a well-established priority. There is limited research evidence to guide nursing staff in delivering person-centred care, particularly under conditions where patients are emotionally distressed. Misunderstood distress has negative implications for patient well-being and hospital resources. The purpose of this study is to use the expertise of nurses to recommend ways to care for the emotional well-being of patients with dementia that are achievable within the current hospital setting.

Design/methodology/approach

A qualitative study was conducted in two long-stay wards providing dementia care in a UK hospital. Nursing staff (n = 12) were asked about facilitators and barriers to providing emotion-focused care. Data were analysed using thematic analysis.

Findings

Nursing staff said that resources existed within the ward team, including ways to gather and present personal information about patients, share multidisciplinary and personal approaches, work around routine hospital tasks and agree an ethos of being connected with patients in their experience. Staff said these did not incur financial cost and did not depend upon staffing numbers but did take an emotional toll. Examples are given within each of these broader themes.

Research limitations/implications

The outcome is a short-list of recommended staff actions that hospital staff say could improve the emotional well-being of people with dementia when in hospital. These support and develop previous research.

Originality/value

In this paper, frontline nurses describe ways to improve person-centred hospital care for people with dementia.

Details

Quality in Ageing and Older Adults, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1471-7794

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Book part
Publication date: 4 October 2013

Zehlia Babaci-Wilhite

This chapter will describe and assess initiatives by the University of Oslo (UoO) in Norway, the purpose of which has been to expand and improve collaboration with…

Abstract

This chapter will describe and assess initiatives by the University of Oslo (UoO) in Norway, the purpose of which has been to expand and improve collaboration with universities in Africa, notably the University of Dar es Salaam (UDSM) in Tanzania. UoO has a long history of North-South cooperation with a wide range of institutions on the African continent. In 2009, the UoO initiated a collaborative program with UDSM entitled “Program for Institutional Transformation Research Outreach” (PITRO) III, supported by Norwegian Agency for Development Co-operation (NORAD). The chapter will situate the UoO-UDSM cooperation in relation to Norwegian aid, and compare the program with previous programs, giving attention to the ways they were developed, how problems and challenges were tackled, and the probable consequences for Tanzania’s development. The chapter will compare and contrast the structure and experiences from these programs, and will point out strengths and weaknesses. Attention will be given to the rights-based approach, an important new dimension in North-South cooperation on higher education in Africa. It will be argued that the incorporation of this approach provides a basis for developing new policies and programs that strengthen African collaboration within research, education, and capacity building in higher education.

Details

The Development of Higher Education in Africa: Prospects and Challenges
Type: Book
ISBN: 978-1-78190-699-6

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Article
Publication date: 11 May 2010

Drago Dolinar, Petar Ljušev, Gorazd Štumberger, Matjaž Dolinar and Daniel Roger

The purpose of this paper is to analyze the impact of magnetic saturation on the steady‐state operation of the induction motor (IM) drive in regard to rotor field‐oriented…

Abstract

Purpose

The purpose of this paper is to analyze the impact of magnetic saturation on the steady‐state operation of the induction motor (IM) drive in regard to rotor field‐oriented control (RFOC). The aim of the presented two methods is to obtain the required steady‐state torque with minimal stator current, which thus reduces stator coper losses considerably.

Design/methodology/approach

The first method is based on an analytic calculation of the peak torque‐per‐ampere ratio curve of saturated IM. The torque characteristics obtained at a constant stator current are used to calculate that value of magnetizing current which gives the minimal stator current for the required load torque. The second method directly searches the minimal stator current for the required load torque. Experiments completely confirm the efficiency of the proposed selection of a magnetizing current reference.

Findings

Operation of the IM drive strongly depends on a proper selection of the rotor flux linkage reference value, the selection of which represents an additional degree of freedom in control design. Therefore, it can be used to optimize some of those drive features subjected to voltage and current constraints. The proposed calculation procedure is simple so that can be easily implemented in practically application. However, some additional IM data like magnetizing curve, inertia moment, and coefficient of viscous friction are necessary.

Originality/value

The substantial impact of saturation on the stead‐state torque characteristics of IM, determined for the constant stator current and the constant d‐axis stator current, is determined analytically and numerically.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, vol. 29 no. 3
Type: Research Article
ISSN: 0332-1649

Keywords

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