Poiseuille flow of an arrheniusly reactive power law fluid incorporated within parallel plates using regular perturbation method and direct integration

This paper presents an approximate analytical solution capable of analyzing the velocity, temperature and concentration distribution in the  poiseuille flow of an arrheniusly reactive power law fluid incorporated within parallel plates. The equations governing the phenomenon are solved  analytically using regular perturbation  method and direct integration, to show the influence of the parameter involved on the system. The effect of  change in parameters such as the power law index, the pressure gradient coefficient, the viscous heating parameter, the Arrhenius chemical  reaction rate and the Frank-Kamenetskii number are presented graphically and discussed. The result obtained revealed that the power law index, the pressure gradient coefficient, the viscous heating parameter, the Frank-Kamenetskii number and the Arrhenius chemical reaction rate enhanced  the fluid flow, average   temperature and species concentration

Observation of chaotic beats in a driven memristive Chua's circuit

In this paper, a time varying resistive circuit realising the action of an active three segment piecewise linear flux controlled memristor is proposed. Using this as the nonlinearity, a driven Chua's circuit is implemented. The phenomenon of chaotic beats in this circuit is observed for a suitable choice of parameters. The memristor acts as a chaotically time varying resistor (CTVR), switching between a less conductive OFF state and a more conductive ON state. This chaotic switching is governed by the dynamics of the driven Chua's circuit of which the memristor is an integral part. The occurrence of beats is essentially due to the interaction of the memristor aided self oscillations of the circuit and the external driving sinusoidal forcing. Upon slight tuning/detuning of the frequencies of the memristor switching and that of the external force, constructive and destructive interferences occur leading to revivals and collapses in amplitudes of the circuit variables, which we refer as chaotic beats. Numerical simulations and Multisim modelling as well as statistical analyses have been carried out to observe as well as to understand and verify the mechanism leading to chaotic beats.Comment: 30 pages, 16 figures; Submitted to IJB

R&D, Production Structure, and Productivity Growth in the U.S., Japaneseand German Manufacturing Sectors

The paper analyzes the production structure and the demand for inputs in three major industrialized countries, the U.S., Japan and Germany. A dynamic factor demand model with two variable inputs (labor and energy)and two quasi-fixed inputs (capital and R&D) is derived directly from an intertemporal cost-minimization problem formulated in discrete time. Adjustment costs are explicitly specified. The model is estimated for the manufacturing sector of the three countries using annual data from 1965 to 1977. Particular attention is given to the role of R&D. For all countries the rate of return on R&D is found to be higher than that on capital. Their respective magnitudes are similar across countries.We find considerable differences in factor demand schedules; we also find that for all countries the speed of adjustment for capital is higher than that of R&D. Adjustment costs are of importance in the demand equations for capital and R&D, but play a minor role in the decomposition of total factor productivity growth.

The legacy of Verena Holmes: inspiring next generation of engineers

Verena Holmes was born in 1889 in Ashford, Kent, Verena became a pioneer for women in the industry as arguably the first female in the UK to have a full-time career as a professional mechanical, design and biomedical engineer. Verena was an advocate for widening participation in engineering and dedicated to the development of female engineers, she represented a breakthrough for equal rights in the early 20th century. As a creative and talented mechanical engineer, inventor and entrepreneur with own engineering business in Gillingham, Kent. In 1932, Verena Holmes filed a patent for poppet valve for fluid pressured systems, and in 2021 has provided the inspiration to students to conceive, design, implement and operate their own poppet valve. The poppet valve challenging first year biomedical, mechanical and product design engineering students to consider engineering materials, engineering manufacturing, standard components, fixes and fittings, and tolerances considerations into their poppet valve. This paper will provide qualitative analysis of the level of practical engineering learning, and the depth of student learning. Also, the quantitative analysis of the students’ evaluation of the learning opportunity to inspire, develop and stimulate them to be the next generation of engineers

Spatio-temporal trends of typhoid fever among youths attending Muhammad Abdullahi Wase Specialist Hospital in Kano Metropolis, Nigeria

Typhoid fever continues to be significant causes of illness and death particularly among children and adolescents in developing countries as a result of poor sanitation and unsafe food and water supply especially where the water is contaminated by human feces. This study analysed the spatial and temporal trends of typhoid fever in Kano metropolis between 2010-2014. Hospital records for youths attending Muhammad Abdullahi Wase Specialist Hospital (MAWSH) were used. Coordinate of wards in the metropolis was also generated and imported into Arc GIS environment. G-Statistics was used to determine the distribution and cluster of typhoid prevalence. The results showed an upward trend with increase in age. It also showed a downward trend from 2010 to 2014, indicating that people are becoming aware of the disease and the predisposing factors. The findings also revealed higher prevalence among the males. The results of the G- Statistics showed higher prevalence in the northern part of the metropolis, with hot spots in Dakata and Tarauni wards. The study recommends frequent vaccination and good eating and drinking habits as well as good hygienic practices at home and outside home as remedies for addressing the problem.Keywords: Typhoid Fever, Spatial, Temporal, Youths, G-statistics, Kan