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Articles 1681 - 1710 of 2344

Full-Text Articles in Other Engineering

Surface Temperature And Spectral Measurements At Santiaguito Lava Dome, Guatemala, Steve T. M. Sahetapy-Engel, Luke P. Flynn, Andrew J. L. Harris, Gregg J. Bluth, William I. Rose, Otoniel Matias Oct 2004

Surface Temperature And Spectral Measurements At Santiaguito Lava Dome, Guatemala, Steve T. M. Sahetapy-Engel, Luke P. Flynn, Andrew J. L. Harris, Gregg J. Bluth, William I. Rose, Otoniel Matias

Department of Geological and Mining Engineering and Sciences Publications

An infrared thermometer, spectroradiometer and digital video camera were used to observe and document short-term evolution of surface brightness temperature and morphology at Santiaguito lava dome, Guatemala. The thermometer dataset shows 40–70 minute-long cooling cycles, each defined by a cooling curve that is both initiated and terminated by rapid increases in temperature due to regular ash venting. The average cooling rate calculated for each cycle range from 0.9 to 1.6°C/min. We applied a two-component thermal mixture model to the spectroradiometer (0.4–2.5 μm) dataset. The results suggest that the observed surface morphology changed from a cool (120–250°C) crust-dominated surface with high …

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A Template-Based Conceptual Modeling Infrastructure For Simulation Of Physical Security Systems, Paul Savory Oct 2004

A Template-Based Conceptual Modeling Infrastructure For Simulation Of Physical Security Systems, Paul Savory

Department of Industrial and Management Systems Engineering: Faculty Publications

Although simulation is one of the most innovative and cost-effective tools for modeling and analyzing a system, simulation studies often fail to provide any useful results. One reason is attributed to the fact that model formulation depends on the skills of the analyst. This paper describes a research to develop a conceptual modeling infrastructure to assist a simulation analyst in specifying components for studying physical security systems. The modeling framework has been programmed as an internet-based web application. Using the application, the successful development and implementation of a physical security simulation model will be aided by a defined scientific methodology …

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Adaptive Synchronization Of Chaos For Secure Communication, Manish Pantha Oct 2004

Adaptive Synchronization Of Chaos For Secure Communication, Manish Pantha

Master's Theses - Daytona Beach

The purpose of this thesis is to study the use of adaptive synchronization of chaos for secure communication. Several non-linear models were studied, the one-dimensional logistic map, two-dimensional coupled logistic map, three dimensional Lorenz systems with and without time delay. Numerical simulation using MATLAB was conducted. The Lorenz system with time delay was studied numerically as well as by testing an analog circuit and comparisons was made between them. It has been pointed out in many research papers that for low-dimensional chaotic processes, once intercepted, the information can be readily extracted, so the interest has been directed to higher dimensional …

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A Multi-Criteria Approach To The Evaluation Of Aviation E-Marketplace Portals, Edward Sweeney, Emilio Esposito, Pietro Evangelista, Michel Mastroianni, Renato Passaro, Claudia-Maria Wagner Sep 2004

A Multi-Criteria Approach To The Evaluation Of Aviation E-Marketplace Portals, Edward Sweeney, Emilio Esposito, Pietro Evangelista, Michel Mastroianni, Renato Passaro, Claudia-Maria Wagner

Conference papers

After a proliferation of logistics e-Marketplaces during the dot.com boom of 1998-2000, there has been a high rate of failure and survivals are developing much more slowly than expected. This is the case of aviation industry where a large number of B2B e-Marketplaces emerged according to the focus of aviation companies’ strategies on electronic B2B in the late 1990s. However, the current use of e-Marketplaces in the industry is low and many of them have ceased trading. The traditional e-Marketplaces model have been characterised by poor quality of portals and the lack of technical standards. Such an approach is unsustainable …

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Numerical Modeling Of Geophysical Granular Flows: 2. Computer Simulations Of Plinian Clouds And Pyroclastic Flows And Surges, Sebastien Dartevelle, William I. Rose, John Stix, Karim Kelfoun, James W. Vallance Aug 2004

Numerical Modeling Of Geophysical Granular Flows: 2. Computer Simulations Of Plinian Clouds And Pyroclastic Flows And Surges, Sebastien Dartevelle, William I. Rose, John Stix, Karim Kelfoun, James W. Vallance

Department of Geological and Mining Engineering and Sciences Publications

Geophysical granular flows display complex nonlinear, nonuniform, and unsteady rheologies, depending on the volumetric grain concentration within the flow: kinetic, kinetic-collisional, and frictional. To account for the whole spectrum of granular rheologies (and hence concentrations), we have used and further developed for geophysical-atmospheric applications a multiphase computer model initially developed by U.S. Department of Energy laboratories: (Geophysical) Multiphase Flow with Interphase Exchange. As demonstrated in this manuscript, (G)MFIX can successfully simulate a large span of pyroclastic phenomena and related processes: plinian clouds, pyroclastic flows and surges, flow transformations, and depositional processes. Plinian cloud simulations agree well with the classical plume …

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Scattering Matrices Of Volcanic Ash Particles Of Mount St. Helens, Redoubt, And Mount Spurr Volcanoes, O. Muñoz, H. Volten, J. W. Hovenier, B. Veihelmann, W. J. Van Der Zande, L. B. F. M. Waters, William I. Rose Aug 2004

Scattering Matrices Of Volcanic Ash Particles Of Mount St. Helens, Redoubt, And Mount Spurr Volcanoes, O. Muñoz, H. Volten, J. W. Hovenier, B. Veihelmann, W. J. Van Der Zande, L. B. F. M. Waters, William I. Rose

Department of Geological and Mining Engineering and Sciences Publications

We present measurements of the whole scattering matrix as a function of the scattering angle at a wavelength of 632.8 nm in the scattering angle range 3°–174° of randomly oriented particles taken from seven samples of volcanic ashes corresponding to four different volcanic eruptions: the 18 May 1980 Mount St. Helens eruption, the 1989–1990 Redoubt eruption, and the 18 August and 17 September 1992 Mount Spurr eruptions. The samples were collected at different distances from the vent. The samples studied contain large mass fractions of fine particles and were chosen to represent ash that could remain in the atmosphere for …

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Particles In The Great Pinatubo Volcanic Cloud Of June 1991:The Role Of Ice, Song Guo, William I. Rose, Gregg J. S. Bluth, M. I. Watson May 2004

Particles In The Great Pinatubo Volcanic Cloud Of June 1991:The Role Of Ice, Song Guo, William I. Rose, Gregg J. S. Bluth, M. I. Watson

Department of Geological and Mining Engineering and Sciences Publications

Pinatubo's 15 June 1991 eruption was Earth's largest of the last 25 years, and it formed a substantial volcanic cloud. We present results of analysis of satellite-based infrared remote sensing using Advanced Very High Resolution Radiometer (AVHRR) and TIROS Operational Vertical Sounder/High Resolution Infrared Radiation Sounder/2 (TOVS/HIRS/2) sensors, during the first few days of atmospheric residence of the Pinatubo volcanic cloud, as it drifted from the Philippines toward Africa. An SO2-rich upper (25 km) portion drifted westward slightly faster than an ash-rich lower (22 km) part, though uncertainty exists due to difficulty in precisely locating the ash cloud. …

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Re-Evaluation Of So2 Release Of The 15 June 1991 Pinatubo Eruption Using Ultraviolet And Infrared Satellite Sensors, Song Guo, Gregg J. S. Bluth, William I. Rose, M. I. Watson, A. J. Prata Apr 2004

Re-Evaluation Of So2 Release Of The 15 June 1991 Pinatubo Eruption Using Ultraviolet And Infrared Satellite Sensors, Song Guo, Gregg J. S. Bluth, William I. Rose, M. I. Watson, A. J. Prata

Department of Geological and Mining Engineering and Sciences Publications

In this study, ultraviolet TOMS (Total Ozone Mapping Spectrometer) satellite data for SO2 are re-evaluated for the first 15 days following the 15 June 1991 Pinatubo eruption to reflect new data retrieval and reduction methods. Infrared satellite SO2 data from the TOVS/HIRS/2 (TIROS (Television Infrared Observation Satellite) Optical Vertical Sounder/High Resolution Infrared Radiation Sounder/2) sensor, whose data sets have a higher temporal resolution, are also analyzed for the first time for Pinatubo. Extrapolation of SO2 masses calculated from TOMS and TOVS satellite measurements 19–118 hours after the eruption suggest initial SO2 releases of 15 ± 3 …

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Explosion Dynamics Of Pyroclastic Eruptions At Santiaguito Volcano, Jeffrey B. Johnson, Andrew J. L. Harris, Steve T. M. Sahetapy-Engel, Rudiger Wolf, William I. Rose Mar 2004

Explosion Dynamics Of Pyroclastic Eruptions At Santiaguito Volcano, Jeffrey B. Johnson, Andrew J. L. Harris, Steve T. M. Sahetapy-Engel, Rudiger Wolf, William I. Rose

Department of Geological and Mining Engineering and Sciences Publications

In Jan. 2003 we monitored explosions at Santiaguito Volcano (Guatemala) with thermal, infrasonic, and seismic sensors. Thermal data from 2 infrared thermometers allowed computation of plume rise speeds, which ranged from 8 to 20 m/s. Rise rates correlated with cumulative thermal radiance, indicating that faster rising plumes correspond to explosions with greater thermal flux. The relationship between rise speeds and elastic energy is less clear. Seismic radiation may not scale well with thermal output and/or rise speed because some of the thermal component may be associated with passive degassing, which does not induce significant seismicity. But non-impulsive gas release is …

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Creating Cost Growth Models For The Engineering And Manufacturing Development Phase Of Acquisition Using Logistic And Multiple Regression, Brandon M. Lucas Mar 2004

Creating Cost Growth Models For The Engineering And Manufacturing Development Phase Of Acquisition Using Logistic And Multiple Regression, Brandon M. Lucas

Theses and Dissertations

Cost growth remains a concern for cost analysts, program managers, senior DoD decision-makers, Congress, and even the American public. All of these people have a vested interest in the cost of DoD programs and most would like to see those costs decrease; as such, we need additional tools to help combat cost growth. Previous research creates the foundation for the use of a two-step methodology to help predict cost growth, which we follow closely. First, utilizing logistic regression we analyze whether specific program characteristics predict cost growth within the Engineering and Manufacturing Development (EMD) phase for combined RDT&E and procurement …

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Estimating Cost Growth In Engineering And Schedule Cost Categories Using A Two-Pronged Regression Approach, Chris J. Mcdaniel Mar 2004

Estimating Cost Growth In Engineering And Schedule Cost Categories Using A Two-Pronged Regression Approach, Chris J. Mcdaniel

Theses and Dissertations

This research confirms the usefulness of the logistic and multiple regression two-step procedure for assessing cost growth in major DoD weapon systems. We compile programmatic data from the Selected Acquisition Reports (SARs) between 1990 and 2002 for programs covering all defense departments. Our analysis concentrates on cost growth in the procurement appropriations of the Engineering and Manufacturing Development phase of acquisitions. We investigate the use of logistic regression in cost growth analysis to predict whether or not cost growth will occur in a program. If applicable, multiple regression is implemented to predict how much cost growth will occur. Our study …

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Summer 2004, 90.9 Wmpg Fm Jan 2004

Summer 2004, 90.9 Wmpg Fm

WMPG Program Guides

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Spring 2004, 90.9 Wmpg Fm Jan 2004

Spring 2004, 90.9 Wmpg Fm

WMPG Program Guides

Newspaper format

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Fall 2004, 90.9 Wmpg Fm Jan 2004

Fall 2004, 90.9 Wmpg Fm

WMPG Program Guides

Newspaper format

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Rosenzweig's Messianic Aesthetics, Jules Simon Jan 2004

Rosenzweig's Messianic Aesthetics, Jules Simon

Selected Works Temporary Series

No abstract provided.

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Towards A Computer Assisted Violin Teaching Aid, Derry Fitzgerald, Jane Charles, Eugene Coyle Jan 2004

Towards A Computer Assisted Violin Teaching Aid, Derry Fitzgerald, Jane Charles, Eugene Coyle

Conference papers

This paper presents a possible approach for developing a violin teaching aid based on violin pedagogy, sound analysis and comparison of beginner and good player recordings. This teaching aid is targeted at students who have difficulty listening attentively to the sounds they produce. It aims to draw their attention to the sound of a fault, offer correction and to train the user's ear to actively listen.

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The Frequency Distribution Of Quantization Error In Digitizers For Coherent Sampling, Sol Neeman Ph.D. Jan 2004

The Frequency Distribution Of Quantization Error In Digitizers For Coherent Sampling, Sol Neeman Ph.D.

Engineering Studies Faculty Publications and Creative Works

In this paper the frequency distribution of quantization error in coherent sampling of digitizers will be investigated. As the distribution of the quantization error affects the values of THD and SNR, it is relevant for a correct interpretation of THD and SNR of sine waves in coherent sampling. The distribution of the quantization error will be analyzed as a function of N, total number of samples and M, number of cycles in the sample set and it will be proved that for certain cases, the quantization error falls on odd harmonics only of the frequency of the sampled sine wave.

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Information And Communication Technologies (Ict) Practices In Small Italian Transport And Logistics Service Providers: Empirical Findings And Critical Issues, Maurizio Caiazzo, Pietro Evangelista, Edward Sweeney Jan 2004

Information And Communication Technologies (Ict) Practices In Small Italian Transport And Logistics Service Providers: Empirical Findings And Critical Issues, Maurizio Caiazzo, Pietro Evangelista, Edward Sweeney

Conference papers

No abstract provided.

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Real-Time Sound Source Separation: Azimuth Discrimination And Resynthesis, Dan Barry, Robert Lawlor, Eugene Coyle Jan 2004

Real-Time Sound Source Separation: Azimuth Discrimination And Resynthesis, Dan Barry, Robert Lawlor, Eugene Coyle

Conference papers

We present a real-time sound source separation algorithm which performs the task of source separation based on the lateral displacement of a source within the stereo field. The algorithm exploits the use of the pan pot as a means to achieve image localisation within stereophonic recordings. As such, only an interaural intensity difference exists between left and right channels for a single source. Gain scaling and phase cancellation techniques are used in the frequency domain to expose frequency dependent nulls across the Azimuth plane. The position of these nulls in conjuction with magnitude estimation and grouping techniques are then used …

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An Efficient Phasiness Reduction Technique For Moderate Audio Time-Scale Modification, David Dorran, Eugene Coyle, Robert Lawlor Jan 2004

An Efficient Phasiness Reduction Technique For Moderate Audio Time-Scale Modification, David Dorran, Eugene Coyle, Robert Lawlor

Conference papers

Phase vocoder approaches to time-scale modification of audio introduce a reverberant/phasy artifact into the time-scaled output due to a loss in phase coherence between short-time Fourier transform (STFT) bins. Recent improvements to the phase vocoder have reduced the presence of this artifact, however, it remains a problem. A method of time-scaling is presented that results in a further reduction in phasiness, for moderate time-scale factors by taking advantage of some flexibility that exists in the choice of phase required so as to maintain horizontal phase coherence between related STFT bins. Furthermore, the approach leads to a reduction in computational load …

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Harmonic Sound Source Separation Using Fir Comb Filters, Mikel Gainza, Robert Lawlor, Eugene Coyle Jan 2004

Harmonic Sound Source Separation Using Fir Comb Filters, Mikel Gainza, Robert Lawlor, Eugene Coyle

Conference papers

A technique for separating harmonic sound sources using FIR comb filters is presented. First, a pre-processing task is performed by a multipitch estimator to detect the pitches that the signal is composed of. Then, a method based on the Short Time Fourier Transform (STFT) is utilized to iteratively extract the harmonics belonging to a given source by using FIR comb filters. The presented approach improves upon exising sinusoidal model approaches in terms of the perceptual quality of the extracted signal.

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Single Note Ornaments Transcription For The Irish Tin Whistle Based On Onset Detection, Mikel Gainza, Eugene Coyle, Robert Lawlor Jan 2004

Single Note Ornaments Transcription For The Irish Tin Whistle Based On Onset Detection, Mikel Gainza, Eugene Coyle, Robert Lawlor

Conference papers

Oranamentation plays a very important role in Irish traditional music giving more expression to the music by altering or embellishing small pieces of a melody. Single-note ornamentation, such as cuts and strikes, are the most common type in Irish traditional music and are played by articulating the note pitch during the onset stage. A technique for transcribing single note ornamentation for the tin whistle is based on onset detection is presented. This method focuses on the characteristics of the tin whistle within Irish traditional music, customising a time-frequency based representation for detecting the instant when new notes played using single …

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Onset Detection And Music Transcription For The Irish Tin Whistle, Mikel Gainza, Robert Lawlor, Eugene Coyle, Aileen Kelleher Jan 2004

Onset Detection And Music Transcription For The Irish Tin Whistle, Mikel Gainza, Robert Lawlor, Eugene Coyle, Aileen Kelleher

Conference papers

A technique for detecting tin whistle note onsets and transcribing the corresponding pitches is presented. This method focuses on the characteristics of the tin whistle within Irish traditional music, customising a time-frequency based representation for extracting the instant when a note starts and the music notation. Results show that the presented approach improves upon the existing energy based approaches in terms of the percentage of correct detections.

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Time-Scale Modification Of Music Using A Synchronized Subband/Time-Domain Approach, David Dorran, Robert Lawlor Jan 2004

Time-Scale Modification Of Music Using A Synchronized Subband/Time-Domain Approach, David Dorran, Robert Lawlor

Conference papers

Time-domain audio time-scaling algorithms are efficient in comparison to their frequency-domain counterparts, but they rely upon the existence of a quasi-periodic signal to produce a high quality output. This requirement makes them unsuitable for direct application to complex multi-pitched signals such as polyphonic music. However, it has been shown that applying time-domain algorithms on a subband basis can resolve this issue. Existing subband/time domain approaches result in a reverberant/phasy artifact being introduced into the output due to poor synchronization between time-scaled subbands. This paper presents a number of synchronization schemes that greatly reduce the amount of reverberation/phasiness introduced into the …

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Interactive Lego Robots Learning In A Controlled Environment, Jonathan Mcgehee Dec 2003

Interactive Lego Robots Learning In A Controlled Environment, Jonathan Mcgehee

Mahurin Honors College Capstone Experience/Thesis Projects

This paper reports on learning in autonomous Lego robots programmed to play soccer. The specific focus here is upon how different behaviors can be learned by two identical robots, based on the different type of feedback they receive from the environment. After being constructed with the same design and the same software, two Lego robots are able to perform the same basic soccer actions, such as moving to the ball, determining where the goal is. and kicking the ball. A non-deterministic version of the Q-step learning algorithm is then used to allow a robot to learn a correct series of …

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Fall 2003, 909 Wmpg Fm Oct 2003

Fall 2003, 909 Wmpg Fm

WMPG Program Guides

Fall 2003

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Ict Adoption And Impact On The Italian Logistics Service Providers’ Performance, Pietro Evangelista, Riccardo Mogre, Alessandro Perego, Antonino Raspagliesi, Edward Sweeney Sep 2003

Ict Adoption And Impact On The Italian Logistics Service Providers’ Performance, Pietro Evangelista, Riccardo Mogre, Alessandro Perego, Antonino Raspagliesi, Edward Sweeney

Conference papers

No abstract provided.

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An Examination Of Eu Directive 98/76/Ec In Regards To The Irish Road Haulage Industry, Eoin Plant, Declan Allen, Edward Sweeney Sep 2003

An Examination Of Eu Directive 98/76/Ec In Regards To The Irish Road Haulage Industry, Eoin Plant, Declan Allen, Edward Sweeney

Conference papers

The Irish economy experienced a tremendous increase in economic growth during the 1990s and early 21st Century (Celtic Tiger). This economic boom was export driven and the Irish Road Haulage Industry transported the majority of products produced at some stage, if not a number of stages in the logistics tunnel. In recent times there has been somewhat of a growing unease in the road haulage industry in relation to increasing costs, squeezing already tight profit margins. A report commissioned by the Department of Public Enterprise illustrated that 48% of hauliers identified themselves as needing training in the area of cost …

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Optimization Of Municipal Solid Waste Management In Port Said, Mohamed Fathy Abd El-Rahman Mohamed Badran Jun 2003

Optimization Of Municipal Solid Waste Management In Port Said, Mohamed Fathy Abd El-Rahman Mohamed Badran

Archived Theses and Dissertations

This thesis is done at the American University in Cairo, and titled "Optimization of Municipal Solid Waste Management in Port Said". This thesis is presented by Mohamed Fathy Abd El-Rahman Mohamed Badran, under the supervision of Dr. Salah El-Haggar. Optimization of solid waste management systems was not applied to any Egyptian govemorate using any operational research methodologies. A new concept is arising in the collection activity of municipal solid waste management which is the use of collection stations. This concept was not used in Egypt. In this work, a proposed model for the municipal solid waste management system in Port …

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Fire Behavior Of Some Southern California Live Chaparral Fuels, Lulu Sun, Xiangyang Zhou, Shankar Mahalingam, David R. Weise Mar 2003

Fire Behavior Of Some Southern California Live Chaparral Fuels, Lulu Sun, Xiangyang Zhou, Shankar Mahalingam, David R. Weise

Publications

Wildfire spread in living vegetation, such as chaparral in southern California, often causes significant damage to infrastructure and ecosystems. In order to study wildfire spread in living vegetation, four of the most common chaparral in southern California, chamise, manzanita, scrub oak and ceanothus, were burned and compared. The observed fire behavior included mass loss rate, flame height, temperature structure and velocity field above the burning fuel bed. It was observed that flame height increases mainly with heat release rate. By using successive images of the temperature field, a recently developed thermal particle image velocity (TPIV) algorithm was applied to estimate …

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