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Articles 121 - 150 of 524

Full-Text Articles in Engineering

Phase Change Materials As A Thermal Storage Device For Passive Houses, Kevin Ryan Campbell Jan 2011

Phase Change Materials As A Thermal Storage Device For Passive Houses, Kevin Ryan Campbell

Dissertations and Theses

This study describes a simulation-based approach for informing the incorporation of Phase Change Materials (PCMs) in buildings designed to the "Passive House" standard. PCMs provide a minimally invasive method of adding thermal mass to a building, thus mitigating overheating events. Phase change transition temperature, quantity, and location of PCM were all considered while incrementally adding PCM to Passive House simulation models in multiple climate zones across the United States. Whole building energy simulations were performed using EnergyPlus from the US Department of Energy. A prototypical Passive House with a 1500 Watt electric heater and no mechanical cooling was modeled. The …


Techniques For Enhancing Reliability In Vlsi Circuits, Ransford Morel Hyman Jr Jan 2011

Techniques For Enhancing Reliability In Vlsi Circuits, Ransford Morel Hyman Jr

USF Tampa Graduate Theses and Dissertations

Reliability is an important issue in very large scale integration(VLSI) circuits. In the absence of a focus on reliability in the design process, a circuit’s functionality can be compromised. Since chips are fabricated in bulk, if reliability issues are diagnosed during the manufacturing of the design, the faulty chips must be tossed, which reduces product yield and increases cost. Being aware of this situation, chip designers attempt to resolve as many issues dealing with reliability on the front-end of the design phase (architecture or systemlevel modeling) to minimize the cost of errors in the design which increases as the design …


Bs News November/December Nov 2010

Bs News November/December

Building Services Engineering

No abstract provided.


Bs News September/October Sep 2010

Bs News September/October

Building Services Engineering

No abstract provided.


Asynchronous Mips Processors: Educational Simulations, Robert L. Webb Aug 2010

Asynchronous Mips Processors: Educational Simulations, Robert L. Webb

Master's Theses

The system clock has been omnipresent in most mainstream chip designs. While simplifying many design problems the clock has caused the problems of clock skew, high power consumption, electromagnetic interference, and worst-case performance. In recent years, as the timing constraints of synchronous designs have been squeezed ever tighter, the efficiencies of asynchronous designs have become more attractive. By removing the clock, these issues can be mitigated. How- ever, asynchronous designs are generally more complex and difficult to debug. In this paper I discuss the advantages of asynchronous processors and the specifics of some asynchronous designs, outline the roadblocks to asynchronous …


Bs News July/August Jul 2010

Bs News July/August

Building Services Engineering

No abstract provided.


Bs News May/June May 2010

Bs News May/June

Building Services Engineering

No abstract provided.


Bs News March/April Mar 2010

Bs News March/April

Building Services Engineering

No abstract provided.


Complex Systems Architecting Using Design Primitives, Comparative Analysis And Fuzzy Analytical Feedback, Jason Paul Dauby, Cihan H. Dagli Jan 2010

Complex Systems Architecting Using Design Primitives, Comparative Analysis And Fuzzy Analytical Feedback, Jason Paul Dauby, Cihan H. Dagli

Engineering Management and Systems Engineering Faculty Research & Creative Works

Modern systems are increasing in complexity. It is advantageous to understand and control this complexity as early in the design lifecycle as possible. The system architecting community must reconcile the inherent ambiguity in a system description with the need for analytical assessments of system attributes so as to increase the likelihood of developmental success. Presently, it is commonplace to decompose systems and subsystems using assumptions of idealized severability and reliance on superposition to estimate composite performance. It is suggested that these assumptions can result in errant oversimplification and represent an opportunity for new systems engineering research. This paper introduces a …


B S News January/February Jan 2010

B S News January/February

Building Services Engineering

No abstract provided.


Bs News Dec 2009

Bs News

Building Services Engineering

No abstract provided.


Bs News Oct 2009

Bs News

Building Services Engineering

No abstract provided.


Bs News Sep 2009

Bs News

Building Services Engineering

No abstract provided.


Bs News Jul 2009

Bs News

Building Services Engineering

No abstract provided.


Bs News May 2009

Bs News

Building Services Engineering

No abstract provided.


Bs News Apr 2009

Bs News

Building Services Engineering

No abstract provided.


Bs News Mar 2009

Bs News

Building Services Engineering

No abstract provided.


Using Extensible Modeling In Systems Engineering And Architectural Search, Jason Paul Dauby, Cihan H. Dagli Jan 2009

Using Extensible Modeling In Systems Engineering And Architectural Search, Jason Paul Dauby, Cihan H. Dagli

Engineering Management and Systems Engineering Faculty Research & Creative Works

The system architecting process is the hierarchical reduction of ambiguity associated with user needs and system design. Design allocation, and subsequent integration, implicitly requires a mechanism by which levels of detail can be added and removed from a decision scenario. This paper addresses the idea of engineering model sharing through the concept of vertical and horizontal extensibility as one mechanism by which hierarchical reduction in ambiguity can be facilitated. Extensible modeling introduces a systems architecting approach to the modeling community by identifying model interfaces and carefully decomposing the model domain. While the actual system hardware is not known at the …


Bs News Jan 2009

Bs News

Building Services Engineering

No abstract provided.


Bs News Dec 2008

Bs News

Building Services Engineering

No abstract provided.


Development Of Modular Thermal Control Architecture For Modular Satellites, Quinn Eric Young Dec 2008

Development Of Modular Thermal Control Architecture For Modular Satellites, Quinn Eric Young

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Research has been completed to determine the most effective thermal control architecture for modular satellites. This research investigated principles of modularity, modular spacecraft examples, thermal control methods, and advanced thermal control technologies. A modular spacecraft was designed as a case study to determine key influences and issues. A number of thermal control architectures were developed. Each was evaluated for compatibility with modularity principles, thermal control performance, and a realizable implementation. Thermal control performance was determined by simulating on-orbit conditions for a number of design reference missions, including traditional thermal control architecture used for comparison. An effective thermal control architecture was …


Bs News Nov 2008

Bs News

Building Services Engineering

No abstract provided.


Bs News Oct 2008

Bs News

Building Services Engineering

No abstract provided.


Bs News Sep 2008

Bs News

Building Services Engineering

No abstract provided.


Bs News Jul 2008

Bs News

Building Services Engineering

No abstract provided.


Metrology And Proportion In The Ecclesiastical Architecture Of Medieval Ireland, Avril Behan, Rachel Moss Jun 2008

Metrology And Proportion In The Ecclesiastical Architecture Of Medieval Ireland, Avril Behan, Rachel Moss

Conference Papers

The aim of this paper is to examine the extent to which detailed empirical analysis of the metrology and proportional systems used in the design of Irish ecclesiastical architecture can be analysed to provide historical information not otherwise available. Focussing on a relatively limited sample of window tracery designs as a case study, it will first set out to establish what, if any, systems were in use, and then what light these might shed on the background, training and work practices of the masons, and, by association, the patrons responsible for employing them.


Bs News Jun 2008

Bs News

Building Services Engineering

No abstract provided.


Bs News May 2008

Bs News

Building Services Engineering

No abstract provided.


Bs News Apr 2008

Bs News

Building Services Engineering

No abstract provided.


Bs News Mar 2008

Bs News

Building Services Engineering

No abstract provided.