Numerical solutions for nonlinear gyrotactic bioconvection in nanofluid-saturated porous media with stefan blowing and multiple slip effects

A mathematical model is developed to examine the effects of the Stefan blowing, second order velocity slip, thermal slip and microorganism species slip on nonlinear bioconvection boundary layer flow of a nanofluid over a horizontal plate embedded in a porous medium with the presence of passively controlled boundary condition. Scaling group transformations are used to find similarity equations of such nanobioconvection flows. The similarity equations are numerically solved with a Chebyshev collocation method. Validation of solutions is conducted with a Nakamura tri-diagonal finite difference algorithm. The effects of nanofluid characteristics and boundary properties such as the slips, Stefan blowing, Brownian motion and Grashof number on the dimensionless fluid velocity, temperature, nanoparticle volume fraction, motile microorganism, skin friction, the rate of heat transfer and the rate of motile microorganism transfer are investigated. The work is relevant to bio-inspired nanofluid-enhanced fuel cells and nano-materials fabrication processes

Chebyshev collocation computation of magneto-bioconvection nanofluid flow over a wedge with multiple slips and magnetic induction

In this paper the steady two dimensional stagnation point flow of a viscous incompressible electrically conducting bio-nanofluid over a stretching/shrinking wedge in the presence of passively control boundary condition, Stefan blowing and multiple slips is numerically investigated. Magnetic induction is also taken into account. The governing conservation equations are rendered into a system of ordinary differential equations via appropriate similarity transformations. The reduced system is solved using a fast, convergent Chebyshev collocation method. The influence of selected parameters on the dimensionless velocity, induced magnetic field, temperature, nanoparticle volume fraction and density of motile microorganisms as well as on the local skin friction, local Nusselt number, local Sherwood number and density of motile microorganism numbers are discussed and presented graphically. Validation with previously published results is performed and an excellent agreement is found. The study is relevant to electromagnetic manufacturing processes involving bionano-fluids

Numerical investigation of Von Karman swirling bioconvective nanofluid transport from a rotating disk in a porous medium with Stefan blowing and anisotropic slip effects

In recent years, significant progress has been made in modern micro- and nanotechnologies related to applications in micro/nano-electronic devices. These technologies are increasingly utilizing sophisticated fluent media to enhance performance. Among the new trends is the simultaneous adoption of nanofluids and biological micro-organisms. Motivated by bio-nanofluid rotating disk oxygenators in medical engineering, in the current work, a mathematical model is developed for steady convective Von Karman swirling flow from an impermeable power-law radially stretched disk rotating in a Darcy porous medium saturated with nanofluid doped with gyrotactic micro-organisms. Anisotropic slip at the wall and blowing effects due to concentration are incorporated. The nano-bio transport model is formulated using non-linear partial differential equations (NPDEs), which are transformed to a set of similarity ordinary differential equations (SODEs) by appropriate transformations. The transformed boundary value problem is solved by a Chebyshev collocation method. The impact of key parameters on dimensionless velocity components, concentration, temperature and motile microorganism density distributions are computed and visualized graphically. Validation with previous studies is included. It is found that that the effects of suction provide a better enhancement of the heat, mass and microorganisms transfer in comparison to blowing. Moreover, physical quantities decrease with higher slip parameters irrespective of the existence of blowing. Temperature is suppressed with increasing thermal slip whereas nanoparticle concentration is suppressed with increasing wall mass slip. Micro-organism density number increases with the greater microorganism slip. Radial skin friction is boosted with positive values of the power law stretching parameter whereas it is decreased with negative values. The converse response is computed for circumferential skin friction, nanoparticle mass transfer rate and motile micro-organism density number gradient. Results from this study are relevant to novel bioreactors, membrane oxygenators, food processing and bio-chromatography

Comprehensive Patient Health Care System for the Saudi Hospitals using Information and Mobile Computing Technologies

Information Technology (I. T) forms an important part of the healthcare solution. Accurate and up-to-date information is essential to continuous quality improvement in any organization, and particularly in an area as complex as healthcare. Therefore, diverse information systems must he integrated across the healthcare enterprise. The knowledge base in the medical field is large, complex, and growing rapidly. It includes scientific knowledge, as well as familiarity with the day-to-day business of provid ing healthcare. It is crucial to identify the processes in the healthcare sector that would he benefitted.from the support of Information Technology. The paper is focused on the use of Comprehensive Patient Healthcare System (CPHS) comprising two large subsystems, Computerized Patient Record System (CPRS) and Mobile Computing Clinical System (MC.C.S) as an application of state-of-the-art information and mobile computing technologies in Saudi Arabia hospitals as part of an ongoing research project. Significantly, the use of such technologies with highly efficient techniques for essential information gathering in a timely and cost effective manner in hospital sites is critical in order to understand how to enhance quality health care services to improve the life of patients and rapid decision making. It would therefore be expected that the project would facilitate optimal hospital resource utilization for medical purposes in Saudi Arabia. This development would therefore pave the way for opening new venues in which such highly advanced information and mobile computing technologies are employed in the hospitals and other sectors beyond the field of medical care.PAPER TYPE: Research PaperKEYWORDS : Comprehensive Patient Healthcare System (CPHS); Computerized Patient Record System (CPRS); Mobile Computing Clinical System (MCCS); Information Communication Technology (ICT); Mobile Technolog

ICT Students, Stress and Coping Strategies: English Perspective A Case Study of Midsize Middle Eastern University

This study evaluates the perceptions of stress among Information and Communications Technologry (ICT) students and their coping strategies in dealing with English as the medium of instruction during their university studies. A semi-structured administered survey was conducted using a sample of 267 male students of a Computer Science college from a midsize Middle Eastern university The study also used a phenomenological approach with semi-structured interviews carried out with ten students in order to clarify some qfthefindings qfthis study. Since the research topic is based on student's stress perceptions, the phenomenological analysis of transcribed student's interviews was also an appropriate tool for this study. Phenomenology enables participants to express their feelings about a particular situation or incident in their own point afvieiv which may not be easy to express on a survey. All students who took part in this study thought that they had been stressed at one time or another due to having English as the medium of instruction without a Preparatory Year English Program (PYEP) befbre entering ICT courses. 62% of the students maintained that they have had episodeS of stress due to the English language during their studies at one time or another. The students use different mechanisms to cope up with stress outside the university by engaging themselves in sports, surfing the web, Meditation, hanging out with, friends, sleeping or going in to isolation. The students demand interactive' English language courses, more leisure time activities on campus, proper guidance in English language courses to ease their ICT course-studies. advisory services and peer counsel ling on campus to reduce their stress.PAPER TYPE: Research PaperKEYWORDS: Information Communication Technology (ICT); ICT students; English Language; Stress and Coping strategies; User Behaviour; Survey

A mathematical model of lung functionality using pressure signal for volume-controlled ventilation

Mechanical Ventilation is used to support the respiratory system malfunction by assisting recovery breathing process which could result from diseases and viruses such as pneumonia and COVID-19. Mathematical models are used to study and simulate the respiratory system supported by mechanical ventilation using different modes such as volume-controlled ventilation (VCV). In this research, a single compartment lung model ventilated by VCV is developed during real time mechanical ventilation using pressure signal. This mathematical model describes the lung volume and compliance correctly considering positive end expiration pressure (PEEP) value. The model is implemented using LabVIEW tools and can be used to monitor the volume, flow and compliance as outputs of the model. Two experiments are carried out on the proposed lung model at three input scenarios of volume (400, 500 and 600 ml) for each experiment considering a PEEP value. To validate the model, an artificial lung connected to a VCV with the same scenarios is used. Validation check is conducted by comparing the outputs of the lung model to that of the artificial lung. The experimental results showed that the measured lung model outputs with negative feedback are the same for pressure and flow as the outputs without negative feedback, whereas the measured volume is comparatively lower for negative feedback. Average percent error in the experiment with negative feedback (5.14%) is smaller compared to the experiment without negative feedback (9.28%). Furthermore, the average error of the calculated compliance decreases from 16% (without negative feedback) to 2% (with negative feedback). The obtained results of the proposed method showed good performance and acceptable accuracy. Thus, the model facilitates the clinicians and practitioners as a training tool to learn real-time mechanical ventilation functionalities