Students\u27 Reasoning with Haptic Technologies: A Qualitative Study in the Electromagnetism Domain

With abundant applications in the medical training and entertainment industry, haptic technology is slowly making its way into the realm of science education, particularly in conveying abstract and non-visible concepts. Electric field is one such abstract concept. Past studies have shown that learning concepts such as electric fields in a traditional classroom can be quite challenging since students have a hard time visualizing the phenomena and applying its effects to reason. Furthermore, these concepts are the building blocks for more complex concepts such as matter and molecular interactions. Visuo-haptic devices provide a great platform to enable students to visualize and \u27feel\u27 these invisible forces through well designed simulations. The theory of embodied cognition poses that human body’s sensorimotor experiences with the environment is critical to build conceptual knowledge. This research study explored undergraduate students’ embodied experiences with haptic devices and their perceptions of learning electric fields with the help of visuo-haptic simulations. The results from the study using think-aloud protocol suggest that students were not only able to translate the haptic feedback to gain conceptual understanding of electric field concepts, but were also able to represent these concepts through more accurate and complete electric field diagrams

A Corporate Model of Similitude for SMEs Reunion into a Corporation, Viewed from the Angle of Physical Thought, and Its Complex Economic and Social Impact

In order to exceed the circularity of formal economic thinking, the authors of the present paper favour the models of thinking specific to physics, which are also constructed statistically and mathematically, in an attempt to find an answer to the reunion of similar small and medium enterprises (SMEs), into multinational corporations. A model based on the theory of similitude is thus made use of, born from the very essence of physics, and having an economic and social destination and a complex impact. The physical models intended for economic systems are expressed as systems of partial differential equations, and the result becomes a new vision of reality. This paper details an original model based on physical similitude for SME amalgamation under the name of multinational corporations. After an introduction to the physical theory of similitude, the first section describes the physics model because of the reunion of similar SMEs. The real birth of some corporations in Serbia forms the content of the second section; the economic and social phenomena relating to the generation of such corporations, and the corporate social responsibility are emphasized. The idea of social complexity and its impact as the fifth dimension of a modern multinational corporation conclude the paper.physical model, small and medium enterprise (SME), multinational corporation (MNE), corporate social responsibility (CSR), economic and social complexity

Compatible finite element methods for numerical weather prediction

This article takes the form of a tutorial on the use of a particular class of mixed finite element methods, which can be thought of as the finite element extension of the C-grid staggered finite difference method. The class is often referred to as compatible finite elements, mimetic finite elements, discrete differential forms or finite element exterior calculus. We provide an elementary introduction in the case of the one-dimensional wave equation, before summarising recent results in applications to the rotating shallow water equations on the sphere, before taking an outlook towards applications in three-dimensional compressible dynamical cores.Comment: To appear in ECMWF Seminar proceedings 201

A content analysis of presentations of electrostatics in South African upper secondary school textbooks

A thesis submitted to the faculty of humanities, University of the Witwatersrand, Johannesburg, in fulfillment of the requirements for the degree of Doctor of philosophy Johannesburg, 26 May 2017The reality of South African education leaves little doubt that the school science textbook is the primary means by which the „what is taught and learnt‟ in science classrooms is determined. Reports from different countries suggest the same trait. The possibility that not all learners‟ „naïve ideas‟ originate in everyday life has also emerged in the literature along with allusions to the quality of textbooks. If school textbooks are to be blamed, even partially, for learners‟ naïve ideas, a systematic analysis of their subject content becomes requisite. The present study is a systematic content analysis of presentations of foundational aspects of Electrostatics, in approved South African physical sciences textbooks in use after the first democratic elections of 1994, thus representing and addressing three curricula school education has gone through since. The study was perceived as a first step to an anticipated analysis of the entire topic Electromagnetism to which Electrostatics is part of, given its difficulty as has been widely reported in the literature and its status in school curricula. Using the conceptual framework of the Classical Electromagnetic Theory, six foundational aspects of Electrostatics were demarcated for the analysis, targeting the concept charge, its origins, transfer and conservation, the distinction between conductors and insulators, the attraction between charged and uncharged objects, as well as global perceptions of Electrostatics and its place within Electromagnetism. Categorisation tables with theoretically grounded indicators were developed as the primary constructs against which texts were analysed, but inductive categorisation tables emerged from the texts as well. An additional construct was necessitated and developed, the “Organisation of the science educator‟s thought”, based on the notion of a scientific explanation and the nature of scientific models, for analysing links between macro and micro. The analysis revealed that the subject matter content of Electrostatics in South African textbooks is of major concern, giving learners no reason to make sense or develop an appreciation for science, physics in particular. In fact it is not science. The analysis suggests that the long lists of problems revealed, have their origin in two main drawbacks: Firstly, inadequate author understanding of the concept charge, disregarded or misused in the texts, and secondly, author unawareness of the inferred nature of science models, affecting purpose of accounts, explanations and reasoning. Furthermore, certain unprofessional author practices are suggested, such as lack of familiarity with curricula and the content of other topics (not a single link was found), lack of research, and general disregard for learners‟ difficulties, while misconceptions identified in the literature are all communicated in the texts, most explicitly so. The findings suggest that science textbook authors are in need of training.MT201

Green Road

In this project, we designed and implemented a prototype device that harvests vehicular kinetic energy and converts it to electrical energy. The proposed solution is a three phase permanent magnetic generator capable of producing 15 volts from a car moving 60 mph while only imposing .06 Gs on the vehicle. This energy is fed through a custom built circuit that converts the voltage from AC to DC and can power roadside infrastructure

Marcel Grossmann and his contribution to the general theory of relativity

This article reviews the biography of the Swiss mathematician Marcel Grossmann (1878-1936) and his contributions to the emergence of the general theory of relativity. The first part is his biography, while the second part reviews his collaboration with Einstein in Zurich which resulted in the Einstein-Grossmann theory of 1913. This theory is a precursor version of the final theory of general relativity with all the ingredients of that theory except for the correct gravitational field equations. Their collaboration is analyzed in some detail with a focus on the question of exactly what role Grossmann played in it.Comment: 52pp, 7 figs, to appear in Proceedings of 13th Marcel Grossmann meeting; revised version with some minor stylistic emendation

An Introduction to Ontology

Analytical philosophy of the last one hundred years has been heavily influenced by a doctrine to the effect that one can arrive at a correct ontology by paying attention to certain superficial (syntactic) features of first-order predicate logic as conceived by Frege and Russell. More specifically, it is a doctrine to the effect that the key to the ontological structure of reality is captured syntactically in the ‘Fa’ (or, in more sophisticated versions, in the ‘Rab’) of first-order logic, where ‘F’ stands for what is general in reality and ‘a’ for what is individual. Hence “f(a)ntology”. Because predicate logic has exactly two syntactically different kinds of referring expressions—‘F’, ‘G’, ‘R’, etc., and ‘a’, ‘b’, ‘c’, etc.—so reality must consist of exactly two correspondingly different kinds of entity: the general (properties, concepts) and the particular (things, objects), the relation between these two kinds of entity being revealed in the predicate-argument structure of atomic formulas in first-order logic