High Frequency Mesh Network for Control and Sensor Arrays

This is a journal articleThis paper explores wireless mesh networking by establishing short-range telemetry links in the Industrial Scientific and Medical (ISM) frequency band of 13.56MHz and demonstrating the forwarding capabilities of a mesh network. For this purpose three transceivers are designed and built which act as nodes on the network, two of which are embedded nodes.The transceivers are designed using Phase Locked Loops (PLLs)both as a signal source and a direct Frequency Modulation (FM) demodulator

Removal of Pyrethrin from Aqueous Effluents by Adsorptive Micellar Flocculation

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.The equilibrium adsorption of pyrethrin onto aggregates formed by the flocculation of micelles of the surfactant sodium dodecyl sulphate (SDS) with aluminium sulphate is reported.The experimental results were analysed using different adsorption isotherms (Langmuir, Freundlich, Redlich-Peterson, Sips, Radke-Prausnitz, Temkin, linear equilibrium, and the Dubin-Radushkevich isotherms). The Freundlich and linear equilibrium isotherms best describe the adsorption of pyrethrin onto SDS micellar flocs, with the Freundlich adsorption constant, ? ?, and the mass distribution coefficient, ? ?, of 64.266 ((mg/g)(L/mg)1/?) and 119.65 L/g, respectively. Applicability of the Freundlich adsorption model suggests that heterogeneous surface adsorption affects the adsorption. The mean free energy value estimated using the Dubinin-Radushkevich isotherm was 0.136 kJ/mol indicating that physisorption may be predominant in the adsorption process

Social Media Strategies for Dynamic Library Service Development

Published as part of the a volume in the Advances in Library and Information Science (ALIS) Book Series.Like in any endeavor, adoption and use of social media requires planning. However, this is not the case in Zimbabwe. To assess the situation, a study was conducted among different type of libraries in the country. Purposive sampling technique was adopted. The objectives were to find out the libraries which had social media strategic plans, and, among those which had none, to establish the extent to which social media use policies and principles corresponded to the basic strategic plan model. Results indicated that adopted tools include Facebook, Wikis, YouTube, Blogs, Twitter, Skype, Flicr, Ning, and LinkedIn. Reasons for adoption included being trendy as well as to enhance the library?s efficiency, and goals included to continuously avail information in a variety of formats to clients within a short space of time and to effectively market library services. However, no library had a written social media strategic plan. The principles and policies for using social media covered strategies for implementation, surveillance, and monitoring of platforms for accountability

e-Infrastructure and e-Services for Developing Countries: 6th International Conference, AFRICOMM

6th International Conference, AFRICOMM 2014, Kampala, Uganda, November 24-25, 2014, Revised Selected PapersUnused spectrum in the television band (so-called TV white space) has the potential to provide new spectrum for access to informa- tion and communication services in developing countries. This claim has been subject to a variety of measurement studies. The purpose of this paper is to survey these studies to better characterize the spectrum that is provided by TV white space. We discuss some of the challenges to such studies and characterize the available TV white space spectrum in terms of the total volume that is available

A guide to debating and public speaking, also including notes on adjudication and training activities for Zimbabwean schools and universities.

Debating and Public Speaking handbook. Also includes notes on adjudication and training activities for Zimbabwean schools and universities.Debating is a form of discussion where people express different opinions about a particular subject. We witness it in our private and public lives. Families debate household or financial issues; companies search for agreement on contracts; opposing sides negotiate in labour disputes or sociopolitical conflicts; and legislators debate critical national issues in parliament. In its most positive sense, debating creates space for dialogue in our lives. This can lead to conflict transformation, fostering better relations between different groups and solutions to problems. In a world that has become complex because of advances in science, economics and new technologies, we are daily faced with many choices. One must critically analyse all options to arrive at sensible decisions, and this is where debating skills help. These can equip us with knowledge of different situations and critical tools to make sense of them, so that we can strive towards the best possible solutions. In high schools and universities, today?s finest debaters and public speakers will likely become tomorrow?s most influential leaders. This underscores the need for well organised debating societies to nurture our future leaders, ideally producing articulate individuals, well versed in current affairs and able to recognise and make good arguments

Effect of Mo content on the structural and physical properties of Cr100-xMox alloys

Proceedings of South African Institute of Physics (SAIP), 2014. The 59th annual conference of the South African Institute of Physics.Alloying Cr with Mo, which is isoelectric with it, shows an unexpected decrease in the N?el temperature (TN) with an increase in Mo concentration. This is attributed to a delocalization of the 3-d bands in Cr through the introduction of 4-d electrons of Mo. In the present investigation the effect of Mo concentration on the structural, magnetic and electrical properties of Cr is systematically studied. A series of Cr100-xMox alloys, with x = 0, 3, 7, 15 and 25, was prepared and the actual concentrations established using electron microprobe analyses. XRD studies confirm the bcc structure of these alloys as in pure Cr and indicate an increase in lattice constant with an increase in Mo concentration. The crystallite sizes calculated from these results for the Cr100-xMox alloys ranges between 15 and 30 nm. The physical properties of these alloys were investigated through magnetic susceptibility (?), Seebeck coefficient (S), electrical resistivity (?) and Hall coefficient (RH) as function of temperature (T) measurements. TN values obtained from these measurements are comparable.South African National Research Foundatio

E-Learning Environments in Undergraduate Design and Technology Courses

E-Learning Environments in Undergraduate Design and Technology Courses is a journal article for technical teacher education.When e-learning and other information and communication technologies (ICT?s) became accepted in both distance and face-to-face modes of learning in tertiary education, expectations were high that they would, within a reasonable time frame, yield visible and perhaps irrefutable gains in course delivery strategies and revolutionise both learning content knowledge and access to it. In developing countries it was hoped that there would be benefits in tapping into a knowledge revolution currently dominated by industrialised countries, who are by far the greatest contributors and beneficiaries. The University of Botswana?s (UB) efforts, initiated in 2001, at technological transformation in teaching and learning for meaningful quality processes and outcomes have been evaluated by researchers, reviewers and participants. Comments have been made such as, ?substantial progress, but many challenges? ?very useful teaching support tool for large classes, but there is need to address key background issues? , ?students share learning through educational technologies, but appropriate learning environments are required? . It has been evident that although a lot has been done at institutional management level to promote adoption and implementation of e-learning as a rule at UB, the ideal situation has not materialised. Much of the problem seems to emanate from the interaction between key players, such as top management, the teaching staff and students. This paper reports on an on-going qualitative study that was carried out in order to negotiate and establish acceptable quality and effectiveness of e-learning envisaged by both the staff and students in a course that was not online at the time, in preparation of launching the course online in the next cycle. The action learning research study aimed at constructing an environment and a disposition towards e-learning mutually negotiated between students and their lecturers. Data was collected through various student-lecturer and student-student interaction processes such as classroom lecture, internet search, group presentations, tests, assignments, classroom observations, questionnaires, and video script analyses. Preliminary findings indicate that most students are enthusiastic about adopting e-learning if they have been adequately pre-oriented into the method and are consistently guided by caring and competent staff. They also will appreciate quality and effective learning if this is negotiated with someone who can articulate standards of performance

Secular increase in the earth?s LOD strongly implies that the earth might be expanding radially on a global scale

This work is licensed under the Creative Commons Attribution International License (CC BY).Exactly 101 years ago, German scientist?Alfred Lothar Wegener, sailed against the prevailing wisdom of his day when he posited that not only have the Earth?s continental plates receded from each other over the course of the Earth?s history, but that they are currently in a state of motion relative to one another. To explain this, Wegener set forth the hypothesis that the Earth must be expanding as a whole. Wegener?s inability to provide an adequate explanation of the forces and energy source responsible for continental drift and the prevailing belief that the Earth was a rigid solid body resulted in the acrimonious dismissal of his theories. Today, that the continents are receding from each other is no longer a point of debate but a sacrosanct pillar of modern geology and geophysics. What is debatable is the energy source driving this phenomenon. An expanding Earth hypothesis is currently an idea that is not accepted on a general consensus level. Antiproponent of the expanding Earth mercilessly dismiss it as a pseudo or fringe science with their main point of rejection being the energy source to power this supposed expansion. Be that as it may, we show herein that from the well accepted law of conversation of spin angular momentum, Stephenson [1]?s result that over the last 2700 years or so, the length of the Earth?s day has undergone a change of about +17.00 ?s/yr, this result invariably leads to the plausibility the Earth may very be expanding radially at a paltry rate of about +0.60 mm/yr. If correct, this simple fact, automatically move the expanding Earth hypothesis from the realm of pseudo or fringe science, to that of plausible science. Keyword

On a Simpler, Much More General and Truly Marvellous Proof of Fermat?s Last Theorem (II)

This is a preprint article submitted to viXra.org Version 3English mathematics Professor, Sir Andrew John Wiles of the University of Cambridge finally and conclusively proved in 1995 Fermat?s Last Theorem which had for 358 years notoriously resisted all efforts to prove it. Sir Professor Andrew Wiles?s proof employs very advanced mathematical tools and methods that were not at all available in the known World during Fermat?s days. Given that Fermat claimed to have had the ?truly marvellous? proof, this fact that the proof only came after 358 years of repeated failures by many notable mathematicians and that the proof came from mathematical tools and methods which are far ahead of Fermat?s time, this has led many to doubt that Fermat actually did possess the ?truly marvellous? proof which he claimed to have had. In this short reading, via elementary arithmetic methods which make use of Pythagoras theorem, we demonstrate conclusively that Fermat?s Last Theorem actually yields to our efforts to prove it.Prof. Dr. P. Mundy, Dr. P. Makoni. Dr. D. J. Hlatswayo, and Prof. Y.S. Nai

On the gravitational bending of light ?Was Sir Arthur Stanley Eddington right?

This work is licensed under the Creative Commons Attribution International License (CC BY)The paramount British-Led (May 29, 1919) Solar Eclipse Result of Eddington et al. has been tremendous if not an arcane effect in persuading scientists, philosophers and the general public, to accept Einstein?s esoteric General Theory of Relativity (GTR) thereby ?deserting? Newtonian gravitation altogether, especially in physical domains of extreme gravitation where Einstein?s GTR is thought or believed to reign supreme. The all-crucial factor ?2? predicted by Einstein?s GTR has been ?verified? by subsequent measurements, more so by the most impressive and precision modern technology of VLBA measurements using cosmological radio waves to within 99.998% accuracy. From within the most well accepted provinces, confines and domains of Newtonian gravitational theory, herein, we demonstrate that the gravitational to inertial mass ratio of photons in Newtonian gravitational theory where the identities of the inertial and gravitational mass are preserved, the resulting theory is very much compatible with all measurements made of the gravitational bending of light. Actually, this approach posits that these measurements of the gravitational bending of light not only confirm the gravitational bending of electromagnetic waves, but that, on a much more subtler level; rather clandestinely, these measurements are in actual fact a measurement of the gravitational to inertial mass ratio of photons. The significant 19% scatter is seen in the measurements where white-starlight is used, according to the present thesis, this scatter is seen to imply that the gravitational to inertial ratio of photons may very well be variable quantity such that for radio waves, this quantity must?to within 99.998% accuracy, be unity. We strongly believe that the findings of the present reading demonstrate or hint to a much deeper reality that the gravitational and inertial mass, may?after all; not be equal as we have come to strongly believe.National University of Science & Technology (NUST)?s Research & Innovation Department and Research Boar