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Articles 2101 - 2130 of 2157

Full-Text Articles in Mechanical Engineering

Atmospheric Ammonia Scavenging Mechanisms Around A Liquid Droplet In Convective Flow, Wei-Hsin Chen Feb 2004

Atmospheric Ammonia Scavenging Mechanisms Around A Liquid Droplet In Convective Flow, Wei-Hsin Chen

Wei-Hsin Chen

No abstract provided.


Model Of Unsteadyn-Octanedroplet Burning Inhigh-Temperature Streams, Wei-Hsin Chen Jan 2004

Model Of Unsteadyn-Octanedroplet Burning Inhigh-Temperature Streams, Wei-Hsin Chen

Wei-Hsin Chen

No abstract provided.


Underwater Terrain Reconstruction Using Sonar Data Taken From Multiple Vantage Points, Christopher Roman Dec 2003

Underwater Terrain Reconstruction Using Sonar Data Taken From Multiple Vantage Points, Christopher Roman

Christopher N. Roman

No abstract provided.


Three-Dimensional Simulations Of Self-Assembly Of Hut Shaped Si-Ge Quantum Dots, Ashwin Ramasubramaniam, V. B. Shenoy Dec 2003

Three-Dimensional Simulations Of Self-Assembly Of Hut Shaped Si-Ge Quantum Dots, Ashwin Ramasubramaniam, V. B. Shenoy

Ashwin Ramasubramaniam

This article presents the results of three-dimensional modeling of heteroepitaxial thin film growth with the objective of understanding recent experiments on the early stages of quantum dot formation in SiGe/Si systems. We use a continuum model, based on the underlying physics of crystallographic surface steps, to study the growth of quantum dots, their spatial ordering and coarsening behavior. Using appropriate parameters, obtained from atomistic calculations, the (100) orientation is found to be unstable under compressive strains. The surface energy now develops a minimum at an orientation that may be interpreted as the (105) facet observed in SiGe/Si systems ...


Memories Of Dad 15.11.1902- 16.10.1970 A Celebration Of The Life And Works Of Edmund Ramsay Wigan, Marcus R. Wigan Nov 2003

Memories Of Dad 15.11.1902- 16.10.1970 A Celebration Of The Life And Works Of Edmund Ramsay Wigan, Marcus R. Wigan

Marcus R Wigan

Edmund Ramsay Wigan was a distinguished Acoustical and Mechanical Engineer, who patented literally several dozen devices and ideas, was responsible for the field radios used by the Allied forces in Europe in World War 2, and when invited as the special merit Senior Principal at the BBC Research lab in Kingston, Surrey, invented the quality meters, tuned all the BBC broadcasting aerials for quality, and did applied research creating a reliable measure for subjective levels of sound distortion. As a minor practical measure invented the one cycle offset used ever since to avoid feedback in large multi-miked rooms. He was ...


Optical And Acoustic Habitat Characterization With The Seabed Auv, Hanumant Singh, Ryan Eustice, Oscar Pizarro, Christopher Roman Aug 2003

Optical And Acoustic Habitat Characterization With The Seabed Auv, Hanumant Singh, Ryan Eustice, Oscar Pizarro, Christopher Roman

Christopher N. Roman

The Seabed AUV is an Autonomous Underwater Vehicle (AUV) built to serve as a readily available and operationally simple tool for high resolution imaging. It is a hover-capable vehicle that performs optical sensing with a 12 bit 1280/spl times/1024 CCD camera and acoustic high resolution mapping using an MST 300 kHz sidescan and a 675 kHz pencil beam bathymetric sonar. The AUV has been designed for operations from small vessels with minimal support equipment. It has an operational depth of 2000 meters and at 1 m/s can run for up to 10 hours. In this paper we ...


Microphysics Of Atmospheric Carbon Dioxide Uptake By A Cloud Droplet Containing A Solid Nucleus, Wei-Hsin Chen Jul 2003

Microphysics Of Atmospheric Carbon Dioxide Uptake By A Cloud Droplet Containing A Solid Nucleus, Wei-Hsin Chen

Wei-Hsin Chen

No abstract provided.


Transient Mass Transfer And Vortex Bifurcation Of An Aerosol Droplet In Motion, Wei-Hsin Chen Jul 2003

Transient Mass Transfer And Vortex Bifurcation Of An Aerosol Droplet In Motion, Wei-Hsin Chen

Wei-Hsin Chen

No abstract provided.


Wind Gusts, Christopher Roman May 2003

Wind Gusts, Christopher Roman

Christopher N. Roman

Article that appeared in Sail magazine (ISSN: 0036-2700).


Waves And Current, Christopher Roman Mar 2003

Waves And Current, Christopher Roman

Christopher N. Roman

Article that appeared in Sail magazine (ISSN: 0036-2700).


Vortex-Induced Flame Extinction In Two-Phase Counterflow Diffusion Flames With Ch Planar Laser-Induced Fluorescence And Particle-Image Velocimetry, Alix Lemaire, Terrence R. Meyer, Katharina Zahringer, Juan C. Rolon, James R. Gord Mar 2003

Vortex-Induced Flame Extinction In Two-Phase Counterflow Diffusion Flames With Ch Planar Laser-Induced Fluorescence And Particle-Image Velocimetry, Alix Lemaire, Terrence R. Meyer, Katharina Zahringer, Juan C. Rolon, James R. Gord

Terrence R Meyer

Here the interaction between a laminar two-phase, non-pre-mixed counterflow flame and a vortex is examined. Special emphasis is given to the influence of different flame and vortex parameters on the extinction behavior of the flame. Simultaneaous planar laser-induced fluorescence of the CH radical layer produced by the flame and particle-image velocimetry measurements of the flowfield are used to characterize the flame–vortex interaction. These simultaneous diagnostics are used for the first time in this configuration. The extinction processes occurring during the flame–vortex interaction can be analyzed by this method, especially the influence of strain at the flame surface. The ...


Development Of A Fan Airflow Station For Airflow Control In Vav Systems, David Yuill, Nathan Redmann, Mingsheng Liu Feb 2003

Development Of A Fan Airflow Station For Airflow Control In Vav Systems, David Yuill, Nathan Redmann, Mingsheng Liu

David Yuill

A fan airflow station has been developed by the authors. This station is used to determine fan airflow using fan speed and fan head as inputs. These inputs can be measured accurately in variable air volume (VAV) systems, so they can be used as a cost-effective control monitoring method for heating, ventilation and air conditioning (HVAC) systems. Theoretical models have been developed for the flow station using both second and third order relationships between the airflow and the inputs. The theoretical model has been experimentally tested and excellent agreement between the model and the experimental values was found. The second ...


The Mysterious Marine Layer, Christopher Roman Jan 2003

The Mysterious Marine Layer, Christopher Roman

Christopher N. Roman

Article that appeared in Sail magazine (ISSN: 0036-2700).


Waste Burning And Heat Recovery Characteristics Of A Mass Burn Incineration System, Wei-Hsin Chen Jan 2003

Waste Burning And Heat Recovery Characteristics Of A Mass Burn Incineration System, Wei-Hsin Chen

Wei-Hsin Chen

No abstract provided.


On The Nature Of The Electrochemically Synthesized Hard Fe-0.96 Mass Pct C Alloy Film Nov 2002

On The Nature Of The Electrochemically Synthesized Hard Fe-0.96 Mass Pct C Alloy Film

A.S. Md Abdul Haseeb

A hard Fe-0.96 mass pet C alloy with a hardness value of 810 HV has been electrochemically synthesized from a ferrous sulfate bath containing a small amount of citric acid and L-ascorbic acid. The nature of the alloy has been investigated by a number of techniques, including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Mössbauer spectroscopy, differential scanning calorimetry (DSC), and magnetic measurements. The decomposition behavior of the alloy is also studied and compared with that of thermally prepared martensite. It has been found that the electrochemically deposited Fe-C alloy exists ...


The Seabed Auv — A Platform For High Resolution Imaging, Hanumant Singh, Ryan Eustice, Christopher Roman, Oscar Pizarro Aug 2002

The Seabed Auv — A Platform For High Resolution Imaging, Hanumant Singh, Ryan Eustice, Christopher Roman, Oscar Pizarro

Christopher N. Roman

No abstract provided.


An Analysis Of Gas Absorption By A Liquid Aerosol In A Stationary Environment, Wei-Hsin Chen Jul 2002

An Analysis Of Gas Absorption By A Liquid Aerosol In A Stationary Environment, Wei-Hsin Chen

Wei-Hsin Chen

No abstract provided.


Multiscalar, Multisensor Search And Survey With Hovering Auvs, Christopher Roman, Hanumant Singh Apr 2002

Multiscalar, Multisensor Search And Survey With Hovering Auvs, Christopher Roman, Hanumant Singh

Christopher N. Roman

No abstract provided.


Toward Improved Film Cooling Prediction, G. Medic, Paul A. Durbin Mar 2002

Toward Improved Film Cooling Prediction, G. Medic, Paul A. Durbin

Paul A. Durbin

Computations of flow and heat transfer for a film-cooled high pressure gas turbine rotor blade geometry are presented with an assessment of several turbulence models. Details of flow and temperature field predictions in the vicinity of cooling holes are examined. It is demonstrated that good predictions can be obtained when spurious turbulence energy production by the turbulence model is prevented.


Brachial Burning And Gasification Split Of A Two-Droplet System, Wei-Hsin Chen Dec 2001

Brachial Burning And Gasification Split Of A Two-Droplet System, Wei-Hsin Chen

Wei-Hsin Chen

No abstract provided.


Uwit: Underwater Image Toolbox And Mosaicking In Matlab, R. Eustice, O. Pizarro, C. Roman, H. Singh Nov 2001

Uwit: Underwater Image Toolbox And Mosaicking In Matlab, R. Eustice, O. Pizarro, C. Roman, H. Singh

Christopher N. Roman

No abstract provided.


A Short Summary Of Seabed And Some Data Highlights, H. Singh, R. Eustice, C. Roman, O. Pizarro, N. Mcphee Nov 2001

A Short Summary Of Seabed And Some Data Highlights, H. Singh, R. Eustice, C. Roman, O. Pizarro, N. Mcphee

Christopher N. Roman

No abstract provided.


Estimation Of Error In Large Area Underwater Photomosaics Using Vehicle Navigation Data, C. Roman, H. Singh Oct 2001

Estimation Of Error In Large Area Underwater Photomosaics Using Vehicle Navigation Data, C. Roman, H. Singh

Christopher N. Roman

Creating geometrically accurate photomosaics of underwater sites using images collected from an AUV or ROV is a difficult task due to dimensional errors which grow as a function of 3D image distortion and the mosaicking process. Although photomosiacs are accurate locally their utility for accurately representing a large survey area is jeopardized by this error growth. Evaluating the error in a mosaic is the first step in creating globally accurate photomosaics of an unstructured environment with bounded error. Using vehicle navigation data and sensor offsets it is possible to estimate the error present in large area photomosaics independent of the ...


Dynamics Of Sulfur Dioxide Absorption In A Raindrop Falling, Wei-Hsin Chen Sep 2001

Dynamics Of Sulfur Dioxide Absorption In A Raindrop Falling, Wei-Hsin Chen

Wei-Hsin Chen

No abstract provided.


In-Vivo 3d Motion Estimation Of The Shoulder Joint Utilizing Magnetic Resonance Imaging During A Simulated Push Task, D. M. Magnusson, Antonie J. Van Den Bogert, J. L. Ronsky May 2001

In-Vivo 3d Motion Estimation Of The Shoulder Joint Utilizing Magnetic Resonance Imaging During A Simulated Push Task, D. M. Magnusson, Antonie J. Van Den Bogert, J. L. Ronsky

Antonie J. van den Bogert

No abstract provided.


Unsteady Absorption Of Sulfur Dioxide By An Atmospheric Water, Wei-Hsin Chen Apr 2001

Unsteady Absorption Of Sulfur Dioxide By An Atmospheric Water, Wei-Hsin Chen

Wei-Hsin Chen

No abstract provided.


Tri-Brachial Flames Around Two Interactive Droplets In Flows With Fuel Vapor, Wei-Hsin Chen Apr 2001

Tri-Brachial Flames Around Two Interactive Droplets In Flows With Fuel Vapor, Wei-Hsin Chen

Wei-Hsin Chen

The flame structures around two equal-sized and interactive fuel droplets immersed in high-temperature convective flows are examined. When the flame is sustained between the two droplets while the flow is pure air, an anchor-shape flame structure, namely the tri-brachial flame, is clearly observed. When far-field temperature or ambient equivalence ratio is increased, the flame propagates upstream and the fuel-lean premixed flame withers. However, ifthe ambient equivalence ratio is high to some extent such as 0.3, two wings ofthe flame, viz. the fuel-lean and the fuel-rich premixed flames, extend outward from the stoichiometric point. Once the flame encircles the leading ...


Combustion Characteristics And Energy Recovery Of A Small Mass Burn Incinerator, Wei-Hsin Chen Mar 2001

Combustion Characteristics And Energy Recovery Of A Small Mass Burn Incinerator, Wei-Hsin Chen

Wei-Hsin Chen

No abstract provided.


Simulations Of Machines Using Matlab And Simulink, John Gardner Dec 2000

Simulations Of Machines Using Matlab And Simulink, John Gardner

John Gardner

No abstract provided.


Development Of A Continuous Microscratch Technique In An Atomic Force Microscope And Its Application To Study Scratch Resistance Of Ultrathin Hard Amorphous Carbon Coatings, Sriram Sundararajan, Bharat Bhushan Dec 2000

Development Of A Continuous Microscratch Technique In An Atomic Force Microscope And Its Application To Study Scratch Resistance Of Ultrathin Hard Amorphous Carbon Coatings, Sriram Sundararajan, Bharat Bhushan

Sriram Sundararajan

A method to measure friction during scratching at linearly increasing loads in a commercial atomic force/friction force microscope (AFM/FFM) has been developed. The normal load was increased in small increments over the required range for the scratch using a software module while the friction signal was measured via a breakout box and data acquisition computer. Topography images of the scratch were obtained in situ with the AFM in tapping mode with minimal loss of damage event information. This technique was employed to study the scratch resistance of hard amorphous carbon coatings of thicknesses ranging from 20 nm down ...