Development of Analog Behavioural Model of BiMOSFET

Behavioural modelling of a power semiconductor device offers many advantages to an application engineer as it is possible to model the device from the available datasheet without a detailed knowledge of the fabrication process. The development of an analog behavioural model for a BiMOSFET is undertaken here by using the Hammerstein model. The Hammerstein model is developed with static and dynamic block sub-blocks and is designed to respond for varying temperatures.The datasheet values of Ic and Vceare utilized to derive the static linear block,while the dynamic block is modelled as Hammerstein current source.The developed model of the BiMOSFET has been verified for its terminal characteristics through OrCAD simulations and hardware testing. The developed model of BiMOSFETexhibits fast simulation times with reasonable accuracy. The hardware testing is carriedout with BiMOSFET IXBF55N300 by observing its currents and voltages under the variation of gate voltage at constant collector emitter voltage and variation of collector emitter voltage at constant gate voltage.

Quality Control

This review emphasizes on the importance of communication between business performing parties. According to a survey, many business owners who work with mainland Chinese suppliers report that consistent quality is their biggest challenge. The biggest challenge in doing business in China is quality, reliability, and delivery. The survey shows that though the cost is quite low, but that is part of the problem. Companies are constantly being disappointed by their Chinese suppliers because they are taking shortcuts that have not been approved to save money. This has resulted in product yield loss and reliability problems. According to an application engineer, most Westerners think that most Asians speak English, which is a big misunderstanding. The person who works in overseas marketing does, but the engineers and quality control people do not. Westerners make their presentations, unaware they are not being understood 100%. Asians have a lot of ideas, but it is hard to explain over the language barrier.

Using Linear Superposition to Solve Multiple Heat Source Transient Thermal Problems

For many years engineers have been using linear superposition to solve steady state thermal problems with multiple-heat-source systems. Predicting transient response of single-heat-source systems has been performed using R-C Foster networks with reasonable success. In most real applications there are multiple heat sources that are interacting perhaps in very complex ways in the time domain. Being able to simulate these interactions using a spreadsheet tool or a circuit simulator may be very advantageous to a device or application engineer designing or evaluating an application design. Using an RC-network model of a system to represent the individual transient response curves, we’ll show how to do this bookkeeping (and all the other calculations) for a simple system using Microsoft Excel. We’ll also see how to set up this sort of problem in a circuit simulator.

Basic Considerations for Evaluating Hydraulic Power Recovery of Fluid Streams Expanding With or Without Gas or Vapor Evolution

A review of status is presented, discussing hydraulic power recovery of fluid streams expanding with or without gas evolution. Point of departure for the treatise given, is embedded in basic thermodynamics and fluid mechanics. Formulae for estimating isentropic power recovery are derived, which hold asymptotically for low gas to liquid mass fraction. These formulae provide simple means for calculating power recovery with gas evolution, given a certain vapor void fraction. The key element in the entire approach is to attribute the extra power recovery due to gas evolution to the change in density of the fluid stream. The formulae and discussions presented in the paper may assist the (application) engineer in evaluating the effect of vapor evolution with regard to hydraulic performance of hydraulic power recovery turbines. The paper further also discusses the condition of (runaway) overspeed, as this should not be omitted from a review on basic considerations for hydraulic power recovery turbines. Formulae and calculation methods are given for calculating runaway speed, choke flow and time to runaway speed.

From Memory Arts to the New Code Paradigm: The Artist as Engineer of Virtual Information Space and Virtual Experience

This paper examines contemporary developments in the creation and experience of immersive 3D art projects in the context of spatial and information design. It takes into consideration historic forebears, particularly the ancient Greek art of memory, contemporary theorists, and current new media artists who are pushing code and application design to new limits. The essay specifically addresses the role of the artist as “coder” and application engineer and anticipates concerns and possible technological developments in data visualization and virtual spaces. As new media artists write their own code, current boundaries between disciplines and sectors become blurred and new aesthetic judgments become pivotal. Additionally, current management and organizational structures are challenged to confront a world that increasingly visualizes and communicates in 3D.