Applied Physics Conference Papers
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- ItemOptics education in a developing country.(Society of Photo-optical Instrumentation Engineers, 2005-10-24) Jonathan, Enock.An optics laboratory plays a critical role in optics education. A major challenge for optics educators in Africa is the shortage or non-availability of laboratory teaching equipment. Optics teaching equipment is beyond the budget of most universities in the developing world such as the new National University of Science and Technology in Zimbabwe. The paper details a successful strategy - local fabrication/assembling of optics laboratory teaching aids - adopted by the Applied Physics Department at Zimbabwe's National University of Science and Technology. Students and technical staff under the guidance of an academic member of staff do equipment fabrication and assembling. The paper describes some of the project-type set-ups for performing experiments on (1) laser light scattering and impurity determination; (2) industrial imaging inspection (3) light transmission and reflection and (4) refractive index measurement
- ItemOpen Source 3-D Printers: An Appropriate Technology for Building Low Cost Optics Labs for the Developing Communities .(Society of Photo-optical Instrumentation Engineers, 2017-08-16) Gwamuri, J.; Pearce, Joshua M.The recent introduction of RepRap (self-replicating rapid prototyper) 3-D printers and the resultant open source technological improvements have resulted in affordable 3-D printing, enabling low-cost distributed manufacturing for individuals. This development and others such as the rise of open source-appropriate technology (OSAT) and solar powered 3-D printing are moving 3-D printing from an industry based technology to one that could be used in the developing world for sustainable development. In this paper, we explore some specific technological improvements and how distributed manufacturing with open-source 3-D printing can be used to provide open-source 3-D printable optics components for developing world communities through the ability to print less expensive and customized products. This paper presents an open-source low cost optical equipment library which enables relatively easily adapted customizable designs with the potential of changing the way optics is taught in resource constraint communities. The study shows that this method of scientific hardware development has a potential to enables a much broader audience to participate in optical experimentation both as research and teaching platforms. Conclusions on the technical viability of 3-D printing to assist in development and recommendations on how developing communities can fully exploit this technology to improve the learning of optics through hands-on methods have been outlined.
- ItemEP-1308 IAEA support to national audit networks for radiotherapy dosimetry.(International Atomic Energy Agency (IAEA), 2013-04) Azangwe, GodfreyThe IAEA has along-standing history providing support and assistance for radiotherapy dosimetry audits in various countries. It has supported the development of methodology and establishment of several national TLD-based QA audit networks for radiotherapy dosimetry. The main objective was to extend the availability of radiotherapy dosimetry audits to as many radiotherapy centres as possible throughout the world. The overall radiotherapy dosimetry audit approach established and developed throughout these CRPs is based on a process of increasingly complex steps and parameters being checked. The first CRP focused on the basic beam calibration audits. The basic programme was extended to audits in non-reference conditions through a second CRP.
- ItemMagnetic properties of the (Cr -xAlx) V alloy system(South African Institute of Physics, 2013) Muchono, Blessed; Sheppard, C.J; Prinsloo, A.R.E.; Alberts, H.L.Electrical resistivity (), Seebeck coefficient (S) and magnetic susceptibility () measurements as a function of temperature on the (Cr -xAlx) V alloy system, with 0 < x are reported. Néel temperatures (TN) obtained from all these measurements decrease with Al concentration, disappearing near x 1.5, again reappearing for x . (T) and S(T) for samples with x 6.1 show weak anomalies making the determination of TN difficult. However, these anomalies are sharply defined in (T), proving that it is an important tool in probing antiferromagnetic in this system. The present results show that the addition of just 1 at.% V to the Cr -xAlx alloy system suppresses antiferromagnetism in the concentration range 5 ≤ x ≤ . This behaviour is similar to that observed for the (Cr -xAlx) 5Mo5 alloy system.
- ItemMagnetic behaviour of the Cr-Al alloy system around the triple point(South African Institute of Physics, 2011) Sheppard, C.J; Prinsloo, A.R.E.; Alberts, H.L.; Strydom, A.M.; Muchono, BlessedElectrical resistivity and specific heat measurements on a series of Cr1-xAlx (0 ≤ x ≤ 0.034) alloy single crystals are reported. The results indicate that the triple point, where the incommensurate and commensurate spin-density-wave phases coexist with the paramagnetic phase, is situated close to T = 0 K on the magnetic phase diagram.