WELL DELIVERABILITY PREDICTIONS OF GAS FLOW IN GAS-CONDENSATE RESERVOIRS, MODELLING NEAR-CRITICAL WELLBORE PROBLEM OF TWO PHASE FLOW IN 1 -DIMENSION

Production of gases from gas-condensate reservoirs are known to bear certain challenges largely due to the formation of retrograde condensates that hinder gas flow. The drop out of this liquid creates flow regions that are characterized by the liquid saturation as it affects the mobility of the two phase flow, thereby preventing the effective modeling of well productivity. In this study, a predictive model based on an analytical approach is developed to predict gas flow in gas condensate reservoirs. This study compares the estimated gas flow from the developed model for gas-condensate reservoirs to the flow of an existing model for gas reservoirs. This study observes the effects of liquid drop-out on productivity at low pressures and the condensate unloading pressure, which is comparable to that of commercial softwar

Pebble bed: reflector treatment and pressure\ud velocity coupling

In this report, we describe some models and numerical methods used to simulate the flow and temperature in a pebble bed modular nuclear reactor. The reactor core is filled with around 450000 spheres containing low enriched uranium and helium is forced through these hot pebbles to cool the system down. The group first investigated the flow model in the pebbles. Numerical aspects were then considered to tackle difficulties encountered with the flow simulation and the temperature inside the pebbles. Numerical schemes are presented that can significantly improve the accuracy of the computed results

Numerical study of radiative Maxwell viscoelastic magnetized flow from a stretching permeable sheet with the Cattaneo–Christov heat flux model

In this article, the Cattaneo-Christov heat flux model is implemented to study non-Fourier heat and mass transfer in the magnetohydrodynamic (MHD) flow of an upper convected Maxwell (UCM) fluid over a permeable stretching sheet under a transverse constant magnetic field. Thermal radiation and chemical reaction effects are also considered. The nonlinear partial differential conservation equations for mass, momentum, energy and species conservation are transformed with appropriate similarity variables into a system of coupled, highly nonlinear ordinary differential equations with appropriate boundary conditions. Numerical solutions have been presented for the influence of elasticity parameter (), magnetic parameter (M2), suction/injection parameter (λ), Prandtl number (Pr), conduction-radiation parameter (Rd), sheet stretching parameter (A), Schmidt number (Sc), chemical reaction parameter (γ_c), modified Deborah number with respect to relaxation time of heat flux (i.e. non-Fourier Deborah number) on velocity components, temperature and concentration profiles using the successive Taylor series linearization method (STSLM) utilizing Chebyshev interpolating polynomials and Gauss-Lobatto collocation. The effects of selected parameters on skin friction coefficient, Nusselt number and Sherwood number are also presented with the help of tables. Verification of the STSLM solutions is achieved with existing published results demonstrating close agreement. Further validation of skin friction coefficient, Nusselt number and Sherwood number values computed with STSLM is included using Mathematica software shooting quadrature

Transmission dynamics of HIV/AIDS with screening and non-linear incidence

This paper examines the transmission dynamics of HIV/AIDS with screening using non-linear incidence. A nonlinear mathematical model for the problem is proposed and analysed qualitatively using the stability theory of the differential equations. The results show that the disease free equilibrium is locally stable at threshold parameter less than unity and unstable at threshold parameter greater than unity. Globally, the disease free equilibrium is not stable due existence of forward bifurcation at threshold parameter equal to unity. However numerical results suggest that screening of unaware infectives has the effect of reducing the transmission dynamics of HIV/AIDS. Also, the effect of non-linear incidence parameters showed that transmission dynamics of HIV/AIDS will be lowered when infectives after becoming aware of their infection, do not take part in sexual interaction or use preventive measures to prevent the spreading of the infection. Numerical simulation of the model is implemented to investigate the sensitivity of certain key parameters on the transmission dynamics of HIV/AIDS with screening using non-linear incidence.Keywords: HIV/AIDS, Screening, Non-linear incidence, Reproduction number, Stabilit

SINGLE-PLANT STARVATION AND PAIRED-PLANT STARVATION TESTS OF ADULT Neochetina eichhorniae WARNER

Single-plant starvation and paired-plant starvation tests were performed on adult Neochetina eichhorniae to determine the feeding specificity of the insect on the following plants: Eichhornia crassipes, Pistia stratiotes, Hymphaea lotus, Ceratopteris sp, Azolla species, Colocasia esculentus, Vigna sinensis, Talium triangulare, Capsicum annum and Lycopesicom esculentus.The feeding spots of N.     eichhorniae on the different plants were assessed and counted using a hand-counter.  N. eichhorniae adults fed on E. crassipes only, confirming the feeding specificity of the N. eichhorniae to E. crassipes and the safety of other plants growing in the habitat

Impact of Processing on Physical, Chemical and Pasting Properties of Tamarind (T. indica) Seed Flour

Tamarind seed is a discarded waste material from the tamarind pulp industry. The seed contains plethora of nutrients, however its application as food ingredient in Nigeria is limited. This study investigated the impact of processing techniques on physical (colour), proximate, mineral, anti-nutrient and pasting properties of tamarind seed flour using standard methods. Unprocessed seeds (sample A) served as the control, soaked seeds (sample B), roasted seeds (sample C) and autoclaved seeds (sample D). The obtained flour samples were analysed for the physical (colour), proximate, mineral, anti-nutrient and pasting properties using standard methods. Colour values (L*) of seed flour decreased whereas a* and b* values increased in processed flours compared to the control. Raw and processed tamarind seed flours are composed mainly of carbohydrate (65.0-75.2%) and protein (2.3-12.7%) with minuscule quantities of dietary fibre (3.50-7.10%), fat (5.4-6.8%) and ash (1.25-2.08%). The results revealed the following ranges in mineral concentrations: calcium (11.72-18.76mg/100g), magnesium (125.48-152.55mg/100g), potassium (224.49-487.37mg/100g) and iron (22.34-31.04mg/100g). Boiling, autoclaving and roasting significantly (p≤0.05) altered the anti-nutritional contents of tamarind seeds. There exist variation in the pasting viscosities with the control and processed tamarind flours being significantly different (p≤0.05).  The study highlighted that roasting of the seeds could eliminate the anti-nutrients and improved the quality of seeds compared to soaking and autoclaving processes. Exploring the potential of tamarind seeds for human consumption will clearly reduce the over-dependence on common legumes as protein source in marginalised communities

Effects of Acceptance-Commitment Therapy and Social Skills Training on Depression of Adolescent Students from Father-Absent Families in Lagos State

The home provides the initial training for the child and the parents act as models for their children since the process of socialization depends on both parents playing complementary roles in bringing up the child. However, some socialization difficulties are encountered where these models are missing due to death, divorce, separation or abandonment. Adolescents from father absent households manifest a number of internalizing and externalizing problem behaviour, including sadness, depression, delinquency, anxiety, interpersonal difficulties and low self-esteem. Thus, this study investigated the effects of Acceptance-Commitment Therapy (ACT) and Social Skills Training (SST) on depression of adolescent students from father-absent families. The research work was hinged on Relational frame theory (RFT) and Social Learning theory. Quasi-experimental pre-test/ post-test group design was used for the study. The population of the study comprised all Senior Secondary two (SS11) students in Lagos state. Simple random sampling was used to select a sample size of 157 Senior Secondary two students comprising of eighty two (82) males and seventy five (75) females. The instruments used to obtain relevant data for the study were Kessler Psychological Distress Scale (K10), Father-Absence Questionnaire (FAQ) and The depression, anxiety and stress scale (DASS). Two research questions were raised and two research hypotheses were generated to guide the study. The pre-test and post test scores were analysed using Analysis of Covariance (ANCOVA) at 0.05 level of significance. The study revealed that Acceptance-Commitment Therapy and Social Skills Training significantly reduced depression among adolescents from father-absent families. It was also revealed that gender did not have any significant impact on depression of the participants in the experimental groups. In the light of the study`s results, the researchers presented a number of recommendations and proposals the most important of which are:  There should be awareness and enlightenment workshops and campaigns for parents on the effects of father absence on the increasing risk of depression resulting to escalating rate of suicide among adolescents in secondary schools.  The Ministry of education and other stakeholders should provide counselling centers equipped with materials for Acceptance-Commitment Therapy and other psychological therapies used in the treatment of depression as an integral and functional part of primary health care centres. Keywords: Acceptance-Commitment Therapy, depression, Social Skills Training, Adolescent students, father-absent family, gender

Social and environmental justice for a sustainable future

In October 2022, Canterbury Christ Church University invited staff, students and the wider community to explore the connections between environmental and social justice, to promote inclusive learning environments and celebrate the contribution of diverse voices to building a sustainable future for all. The presentation discusses the experiences of an interdisciplinary and interdepartmental organising committee in embracing the inherent ‘messy complexity’ of both the topic itself and the practical delivery of the conference. By sharing the triumphs, challenges and ‘lessons learned’ we hope to encourage others to explore collaborative and innovative ways to promote environmental and social justice