Numerical simulation of turbulent heat transfer and fluid flow in different tube designs

Numerical simulation was carried out to study the heat transfer, friction factor and thermal performance of water inside different tubes induced with different twisted tapes. The purpose is to ascertain which of the tube designs gives the best performance when compared with the plain tube. The tubes were under uniform wall heat flux condition and Reynolds number in the range 5000 ≤ Re ≤ 20000 were considered. RNG κ − ε equation model was selected for the numerical simulations and RANS equations were employed to render the Navier-Stokes equations tractable. The best performance was obtained when the tube was fitted with alternate-axis triangular cut twisted tape. Its Nusselt number and friction factor are respectively 2.07 – 3.33 and 10.65 – 13.1 times better than that of a plain tube and its thermal performance factor is 1.35 – 1.43 times better than that of the tube with plain twisted tape

Numerical simulation of turbulent heat transfer and fluid flow in different tube designs

Numerical simulation was carried out to study the heat transfer, friction factor and thermal performance of water inside different tubes induced with different twisted tapes. The purpose is to ascertain which of the tube designs gives the best performance when compared with the plain tube. The tubes were under uniform wall heat flux condition and Reynolds number in the range 5000 ≤ Re ≤ 20000 were considered. RNG κ − ε equation model was selected for the numerical simulations and RANS equations were employed to render the Navier-Stokes equations tractable. The best performance was obtained when the tube was fitted with alternate-axis triangular cut twisted tape. Its Nusselt number and friction factor are respectively 2.07 – 3.33 and 10.65 – 13.1 times better than that of a plain tube and its thermal performance factor is 1.35 – 1.43 times better than that of the tube with plain twisted tape

Multi-Stage Multi-Criteria Decision Analysis for Siting Electric Vehicle Charging Stations within and across Border Regions

Electric Vehicles (EVs) replace fossil fuel vehicles in effort towards having more sustainable transport systems. The battery of an EV is recharged at a charging point using electricity. While some recharging will be required at locations where vehicles are normally parked, other recharging could be necessary at strategic locations of vehicular travel. Certain locations are suitable for EV charging station deployment, others are not. A multi-stage decision analysis methodology for selecting suitable locations for installing EV charging station is presented. The multi-stage approach makes it possible to select critical criteria with respect to any defined objectives of the EV charging station and techno-physio-socio-economic factors without which the EV charging station could not be deployed or would not serve its designated purpose. In a case, the type of charging station is specified, and a purpose is defined: rapid EV charging stations intended for public use within and across border regions. Applied in siting real EV charging stations at optimal locations, stages in the methodology present additional techno-physio-socio-economic factors in deploying the type of EV charging stations at optimal locations and keep the EV charging stations operating within acceptable standards. Some locations were dropped at the critical analysis stage; others were dropped at the site-specific analysis stage and replacement sites were required in certain instances. Final locations included most optimal, less optimal, least optimal, and strategic or special need locations. The average distances between contiguous recharging locations were less than 60 miles. Using any specified separation standard, the number of additional EV charging stations required between EV charging stations were determinable with the Pool Box. The Overall Charging Station Availability quadrants suggest that the overall user experience could get worse as less-standardized additional EV charging stations are deployed

Modelling the Relationship between Performance Appraisal and Organizational Productivity in Nigerian Public Sector

Quite a number of challenges have been identified as confronting the effective and efficient practice of the performance appraisal system which includes the effect of managerial decisions, reward and its turnout in commitment and loyalty of employees which triggers productivity within the organization. Therefore, this study concentrates on ‘what’, ‘why’ and ‘how’ as the factors generate extreme dissatisfaction among employees and employers. Descriptive survey design method was adopted with the use of questionnaire distributed to the management and staff of some selected public sectors in Lagos State, South-West, Nigeria out of which 254 representing 85% were valid for the research. The questionnaire was structured into four sections. The study pointed that if managerial decisions are fair and just with equitable reward and promotion for job done, it will increase employees’ commitment and loyalty in the organization. In the same vein, if employees were properly motivated with the necessary and adequate training needs, innovation would increase rapidly on the job and this will thereby lead to competitive positioning. In addition to this, employees agreed that if they got regular feedbacks about their performance on the jobs, it could secure competitive positioning for the organization. As this will help them to identify their strengths and weaknesses which could invariably produce opportunities to the organization they are working with and threat to their competitor

Incentives and Job Satisfaction: Its Implications for Competitive Positioning and Organizational Survival in Nigerian Manufacturing Industries

This paper assessed the attitude of workers towards incentive and their satisfaction to work. A sample of 127 valid respondents selected from the managerial and non-managerial staff and data collected were analyzed using Statistical Package for Social Science (SPSS) through descriptive statistics and regression. The findings revealed that financial rewards encourage workers externally; while nonfinancial rewards can satisfy employees internally by making them feel like a valued part of an organization. Also, it was indicated that some employees seem to be satisfied and content with their job not because they derive pleasure from the work itself but because there are no other alternatives. The manufacturing industry needs to embark on the restructuring of jobs and responsibilities in ways that would facilitate competitive advantage without sacrificing the basic objective of the organization

STRATEGIC ROLE OF HUMAN RESOURCE TRAINING AND DEVELOPMENT ON ORGANIZATIONAL EFFECTIVENESS IN NIGERIAN BANKING INDUSTRIES

The rise and fall of many organizations is a reflection of how adaptive, flexible, and focused they are with the changing pattern. The rapid change in technological innovation and advancement has become an indispensable means for organization to equip their employees with the required skilled, knowledge and abilities which are acquired through consistent training to stand against competitive forces. However, this study has examined how best training can be used to reduce waste, incessant level of industrial accidents, lateness to work, fatigue, and absenteeism in order to ensure the survival and growth of the banking industries. The survey design was adopted. Questionnaire was used the major source of data collection. A sample size of one hundred and eighty five (185) staff and management of the selected banks in Lagos metropolis. While the Correlation Analysis and chi square were adopted using Statistical Package for Social Sciences. The findings revealed that employees training significantly influences organizational effectiveness though some of these banks failed because they send their employees on a training programme when they do not have the machines or equipment which they can use to practice when they return from such a training. Without a commitment from management, training will be nothing more than a dream

INTER-SPOUSAL COMMUNICATION AS A DETERMINANT OF CONTRACEPTIVE USE IN NIGERIA: A MIXED METHOD

The need for understanding the level of communication among couples is important in reproductive health. Agreement by couples on contraceptive adoption is a major consideration if population growth will be reduced. Therefore this paper tests the hypothesis that there is no significant relationship between interspousal communication and contraceptive use in Nigeria. The study employed both quantitative and qualitative method of data collection. The quantitative data employed the 2013 Nigeria Demographic and Health Survey Couple recode dataset, while the qualitative data was collected using Focus Group Discussion. Data was analyzed using Stata13 and the qualitative data was analyzed using NVivo 11 software. The result of the logistic regression model showed that there is a significant relationship between inter-spousal communication and contraceptive use (P<0.001). The result of the unadjusted model showed a Log-likelihood ratio [LLR] = 2335.0875, R2 = 27.05% and Chi-square= 1731.32 on 29 degree of freedom while, the adjusted model showed a [LLR] = 435.0011, R2 = 38.20%, Chi-square= 268.36 on 32 degrees of freedom, p<0.05. The reduction of 1296.3189 in the Log-likelihood ratio and an increase of 11.15 % in the R2 indicate a very good fit. In the qualitative study the findings showed that majority of the couples using contraceptives discussed with their spouses and more than half of them received their husband’s maximum support. We conclude that couples communication will improve the uptake of contraceptives and reduce the increasing population growth in Nigeria

Employee Relations Strategy: Implication for Performance in Lagos State University, South-West, Nigeri

The incessant industrial action, strike, boycotting among workers in the educational sector especially in the public universities is becoming a worrisome phenomenon. This paper examined the impact of employee relations strategy (Organizational policies, Promotion, Equity, Recognition and Mentoring) on job performance in Lagos State University, Southwest, Nigeria. A model was developed and tested using One hundred and thirty six (136) copies of valid questionnaire, which were completed by staff in the State owned university, Lagos, Nigeria. Structural Equation Modeling was adopted to test the hypotheses and relationships that might exist among variables. Results of the analysis indicates that equity, promotion, mentoring and recognition have positive influence on employees’ performance. While in the opposite direction, organizational policies have negative and insignificant effect on job performance which suggest that increase in employees’ performance will require that managers pay more attention to friendly organizational policies

Flow pathways and nutrient transport mechanisms drive hydrochemical sensitivity to climate change across catchments with different geology and topography

Hydrological processes determine the transport of nutrients and passage of diffuse pollution. Consequently, catchments are likely to exhibit individual hydrochemical responses (sensitivities) to climate change, which are expected to alter the timing and amount of runoff, and to impact in-stream water quality. In developing robust catchment management strategies and quantifying plausible future hydrochemical conditions it is therefore equally important to consider the potential for spatial variability in, and causal factors of, catchment sensitivity, as it is to explore future changes in climatic pressures. This study seeks to identify those factors which influence hydrochemical sensitivity to climate change. A perturbed physics ensemble (PPE), derived from a series of global climate model (GCM) variants with specific climate sensitivities was used to project future climate change and uncertainty. Using the INtegrated CAtchment model of Phosphorus dynamics (INCA-P), we quantified potential hydrochemical responses in four neighbouring catchments (with similar land use but varying topographic and geological characteristics) in southern Ontario, Canada. Responses were assessed by comparing a 30 year baseline (1968-1997) to two future periods: 2020-2049 and 2060-2089. Although projected climate change and uncertainties were similar across these catchments, hydrochemical responses (sensitivities) were highly varied. Sensitivity was governed by quaternary geology (influencing flow pathways) and nutrient transport mechanisms. Clay-rich catchments were most sensitive, with total phosphorus (TP) being rapidly transported to rivers via overland flow. In these catchments large annual reductions in TP loads were projected. Sensitivity in the other two catchments, dominated by sandy loams, was lower due to a larger proportion of soil matrix flow, longer soil water residence times and seasonal variability in soil-P saturation. Here smaller changes in TP loads, predominantly increases, were projected. These results suggest that the clay content of soils could be a good indicator of the sensitivity of catchments to climatic input, and reinforces calls for catchment-specific management plans

Chronic diseases and multi-morbidity - a conceptual modification to the WHO ICCC model for countries in health transition

Background: The burden of non-communicable diseases is rising, particularly in low and middle-income countries undergoing rapid epidemiological transition. In sub-Saharan Africa, this is occurring against a background of infectious chronic disease epidemics, particularly HIV and tuberculosis. Consequently, multi-morbidity, the co-existence of more than one chronic condition in one person, is increasing; in particular multimorbidity due to comorbid non-communicable and infectious chronic diseases (CNCICD). Such complex multimorbidity is a major challenge to existing models of healthcare delivery and there is a need to ensure integrated care across disease pathways and across primary and secondary care. Discussion: The Innovative Care for Chronic Conditions (ICCC) Framework developed by the World Health Organization provides a health systems roadmap to meet the increasing needs of chronic disease care. This framework incorporates community, patient, healthcare and policy environment perspectives, and forms the cornerstone of South Africa’s primary health care re-engineering and strategic plan for chronic disease management integration. However, it does not significantly incorporate complexity associated with multimorbidity and CNCICD. Using South Africa as a case study for a country in transition, we identify gaps in the ICCC framework at the micro-, meso-, and macro-levels. We apply the lens of CNCICD and propose modification of the ICCC and the South African Integrated Chronic Disease Management plan. Our framework incorporates the increased complexity of treating CNCICD patients, and highlights the importance of biomedicine (biological interaction). We highlight the patient perspective using a patient experience model that proposes that treatment adherence, healthcare utilization, and health outcomes are influenced by the relationship between the workload that is delegated to patients by healthcare providers, and patients’ capacity to meet the demands of this workload. We link these issues to provider perspectives that interact with healthcare delivery and utilization. Summary: Our proposed modification to the ICCC Framework makes clear that healthcare systems must work to make sense of the complex collision between biological phenomena, clinical interpretation, beliefs and behaviours that follow from these. We emphasize the integration of these issues with the socio-economic environment to address issues of complexity, access and equity in the integrated management of chronic diseases previously considered in isolation