The Visual Display of Quantitative Information

https://mtsili.files.wordpress.com/2012/01/thermal_article_elsevier_final.pdf

Power transformer thermal analysis by using an advanced coupled 3D heat transfer and fluid flow FEM model

Over the past three decades a number of studies have investigated alternative conceptions held by students as well as teachers in the fields of the physical, biological, as well as the earth sciences. Most of the studies were conducted in the UK, USA, New Zealand and Australia. More studies on alternative conceptions have been conducted on students rather than teachers. Alternative concepts have become a major focus of classroom based research studies in light of current trends towards more interactive science teaching and learning. More recently, many countries, other than the ones mentioned above, are bringing about a change in classroom practice through teacher education. Pakistan is one of these countries actively involved. This paper reports on a qualitative research study carried out in 1998 on alternative conceptions (ACs) held by a select group of middle school (teachers of classes VI-VIII; age range of students 12-16 years) teachers. The topic focus was current electricity and the study was desig...

Science teachers' alternate conceptions about direct-currents

This thesis studies students’ encounters with school science language games within the framework of laboratory classroom activities in Elementary Electricity. The focus is on students’ interaction ...

/pdf/den-laborativa-klassrumsverksamhetens-interaktioner-en-18t5o819w0.pdf

Den laborativa klassrumsverksamhetens interaktioner: En studie om vilket meningsskapande år 7-elever kan erbjudas i möten med den laborativa verksamhetens instruktioner, artefakter och språk inom elementär ellära, samt om lärares didaktiska handlingsmönster i dessa möten.

Profit based unit commitment: A parallel ABC approach using a workstation cluster

In this paper, we present the conjugate heat transfer analysis in a 167-kVA dry-type transformer using the parallel version of the computational fluid dynamics code Fluent 60 The renormalization group kappa-epsiv model is proposed to compute the turbulent aspect of the convective airflow inside the transformer metal tank for Air Natural/Air Natural cooling conditions An experimental approach was used to assess Joule losses in the low-/high-voltage windings and eddy-current losses in the magnetic core The resulting mathematical model was solved using 14 compute nodes on a distributed machine

Parallel CFD Analysis of Conjugate Heat Transfer in a Dry Type Transformer

We discuss the alternative conceptions of students analysing the behaviour of electrical circuits. Studies on this subject throughout the world indicate that these conceptions differ considerably from those generally accepted in the scientific community. The students were enrolled in Electrical Engineering Technology programmes in the Province of Quebec, Canada (ages 17‐20). The conceptions uncovered are such that major flaws are to be expected in the competence of these future technologists. A qualitative research approach has made it possible to analyse conceptions related to Ohm's law. In particular, these students tend to view all circuits as linear and static (time independent). Thus, they are inclined to replace any component, known or unknown, by ‘its equivalent resistance’. They also consider that voltage is akin to current, on the basis of this belief that voltage is always proportional to current. The results confirm the findings of the international community of researchers in science education...

The persistence of students' unfounded beliefs about electrical circuits: the case of Ohm's law

Recent advances in high-speed networks, rapid improvements in microprocessor design, and availability of highly performing clustering software implementations enables cost-effective high-performance parallel computing on clustered low cost workstations and PCs. Such clusters are very attractive because they rely on availability of the shelf hardware and software technologies. To simplify programming in network environments and to realise component-based software architectures, many models have emerged as possible standards, namely, RPC: Remote Procedure Call, DCE: Distributed Computing Environment, DCOM: Distributed Component Object Model, CORBA: Common Object Request Broker Architecture, PVM: Parallel Virtual Machine and MPI: Message Passing Interface. The MPI approach is considered one of the most mature methods currently used in parallel programming. MPI implementations an emerging cluster interconnects are an important requirement for useful parallel processing on cost-effective computer clusters. This paper offers art overview of different parallel computing environments and models. Functionality and performance of MPI running on homogeneous and heterogeneous workstation clusters are compared. The project goals, laboratory environment, performance measurements, future work, and a conclusion are presented.

Parallel computing environments and methods

Real-time simulation of power system stability using parallel digital signal processors

In this paper we describe the steps taken to solve electrothermal problems in distributed configurations. For that purpose, we computed the 3D temperature distribution in a dry type transformer by solving the Poisson equation with source terms specific to the topology under scope, that is, heat generation by Joule losses and eddy currents, as well as natural cooling on the outside of the metal casing. Our approach is based on the assumption that heat transfer in the electrical device is predominantly diffusion. The solver used for this problem is the well-know BICCG (block incomplete Choleski conjugate gradient).

M. Lavoie

Papers

Parallel CFD Analysis of Conjugate Heat Transfer in a Dry Type Transformer

The persistence of students' unfounded beliefs about electrical circuits: the case of Ohm's law

Parallel computing environments and methods

Real-time simulation of power system stability using parallel digital signal processors

Parallel analysis of electrothermal phenomena in a dry type distribution