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128 full-text articles. Page 1 of 5.

On A Combined Adaptive Tetrahedral Tracing And Edge Diffraction Model, Carl R. Hart 2014 University of Nebraska - Lincoln

On A Combined Adaptive Tetrahedral Tracing And Edge Diffraction Model, Carl R. Hart

Architectural Engineering -- Dissertations and Student Research

A major challenge in architectural acoustics is the unification of diffraction models and geometric acoustics. For example, geometric acoustics is insufficient to quantify the scattering characteristics of acoustic diffusors. One method of quantifying the scattering characteristics of acoustic diffusers is through computational prediction, typically via the time-independent boundary element method (BEM). In contrast, time-domain computations are of interest for characterizing both the spatial and temporal scattering characteristics of acoustic diffusors. Hence, a method is sought that predicts acoustic scattering in the time-domain. A prediction method, which combines an advanced image source method and an edge diffraction model, is investigated for ...


Forecasting Longitudinal Changes In Oropharyngeal Tumor Volume, Position, And Morphology During Image-Guided Radiation Therapy, Adam D. Yock 2014 Texas Medical Center Library

Forecasting Longitudinal Changes In Oropharyngeal Tumor Volume, Position, And Morphology During Image-Guided Radiation Therapy, Adam D. Yock

UT GSBS Dissertations and Theses (Open Access)

The purpose of this work was to generate, evaluate, and compare models that predict longitudinal changes in oropharyngeal tumor volume, position, and morphology during radiation therapy.

One volume, one position, and two morphology (size, shape, and position) feature vectors were used to describe 35 oropharyngeal gross tumor volumes (GTVs) during radiation therapy. The two morphology feature vectors comprised the coordinates of the GTV centroids and one of two shape descriptors. One shape descriptor was based on radial distances between the GTV centroid and 614 surface landmarks. The other was based on a spherical harmonic decomposition of these distances. For a ...


Performance Evaluation Of Material Decomposition Using Rapid Kvp-Switching Dual-Energy Ct For Assessing Bone Mineral Density, John M. Wait 2014 Texas Medical Center Library

Performance Evaluation Of Material Decomposition Using Rapid Kvp-Switching Dual-Energy Ct For Assessing Bone Mineral Density, John M. Wait

UT GSBS Dissertations and Theses (Open Access)

Osteoporosis is diagnosed by assessing the bone mineral density (BMD) of the trabecular bone, and has previously been characterized with dual-energy x-ray absorptiometry (DXA) or single-energy computed tomography (SECT). Dual-energy computed tomography (DECT) is able to create two three-dimensional sets of images representing the densities of two materials in a given basis pair. DECT is theoretically capable of providing a true density measurement of trabecular bone material with the proper material basis pair.

Using the rapid kVp-switching GE HD750 scanner, the concentrations of various solutes were assessed in two-material syringe-phantoms in different experimental conditions with DECT material density images, SECT ...


In Vivo X-Ray Fluorescence Of Bone Lead In The Study Of Human Lead Metabolism In A Cohort Of The General Population And Smelter Employees, Sepideh Behinaein 2014 McMaster University

In Vivo X-Ray Fluorescence Of Bone Lead In The Study Of Human Lead Metabolism In A Cohort Of The General Population And Smelter Employees, Sepideh Behinaein

Open Access Dissertations and Theses

After developing the clover-leaf geometry system, the system was used for the first time in a major survey in 2008 to measure the lead levels of 497 smelter employees in the province of New Brunswick in Canada, who participated in a lead study during the time interval of 14 January to 6 March 2008. Participants were measured for lead concentration in the left tibia and right calcaneus, each for 30 min. The minimum detection limit (MDL) of the clover leaf geometry detector system was improved by a factor 3.1 compared to a conventional system. Improvement of the detection system ...


Identification Of Slums In Mumbai, India: Unsupervised Classification Techniques, Ani St. Amand 2014 University of Southern Maine

Identification Of Slums In Mumbai, India: Unsupervised Classification Techniques, Ani St. Amand

Thinking Matters

Slums are contiguous settlements. Inhabitants lack access to safe water, sanitation and sewage infrastructure, secure housing tenure, uncrowded living space, and permanent, durable housing. Addressing these problematic trends begins with identifying contiguous settlements within Mumbai’s urban fabric. Classifications can be performed using satellite images and remote sensing techniques to yield accurate results. Through literature reviews, socio-cultural analysis, and examination of high resolution satellite imagery, this project aims to develop a systematic, accessible, and reproducible method of classifying Mumbai’s slums.


Impact Testing Of Youth-Level Helmets Versus College-Level Helmets, Nicole Hermann 2014 California Polytechnic State University

Impact Testing Of Youth-Level Helmets Versus College-Level Helmets, Nicole Hermann

Industrial Technology

With so many studies being conducted on professional football players regarding concussions and other related brain injuries, it’s amazing that such an important demographic has been missed. While NFL players are just as subjected to serious injuries as anyone else or even more so, it is important to remember that these players are outfitted, in most cases, with top-of-the-line equipment -- especially their helmets. If the focus is shifted to a younger demographic, youth football players in middle school and high school, the equipment is far less advanced and in a vast majority of cases, has been previously used by ...


Benjamin Banneker's Original Handwritten Document: Observations And Study Of The Cicada, Janet E. Barber, Asamoah Nkwanta 2014 Claremont Colleges

Benjamin Banneker's Original Handwritten Document: Observations And Study Of The Cicada, Janet E. Barber, Asamoah Nkwanta

Journal of Humanistic Mathematics

Benjamin Banneker, farmer, mathematician, astronomer, and scientist, is known for his mathematical puzzles, ephemeris calculations, almanacs, his wooden clock, land surveying work, and famous letter on human rights. However, as a naturalist, his scientific and systematic observations of the cicadas are less known. In this paper we publicize Banneker’s naturalistic study of the seventeen-year periodic cycle of the cicada and make available the original handwritten document of his observations. We also introduce the audience of this journal to an intriguing natural problem involving prime numbers.


Citations Of Publications, Wojciech M. Budzianowski 2014 SelectedWorks

Citations Of Publications, Wojciech M. Budzianowski

Wojciech Budzianowski

No abstract provided.


Tematyka Prac Doktorskich, Wojciech M. Budzianowski 2014 SelectedWorks

Tematyka Prac Doktorskich, Wojciech M. Budzianowski

Wojciech Budzianowski

No abstract provided.


Tematyka Prac Dyplomowych Dla Studentów Wydziału Mechaniczno-Energetycznego Pwr., Wojciech M. Budzianowski 2014 SelectedWorks

Tematyka Prac Dyplomowych Dla Studentów Wydziału Mechaniczno-Energetycznego Pwr., Wojciech M. Budzianowski

Wojciech Budzianowski

No abstract provided.


Unpublished Writings From Audio Magazine: Proposed Series Chapter 3, Richard C. Heyser, Douglas R. Jones Ed. 2014 Columbia College Chicago

Unpublished Writings From Audio Magazine: Proposed Series Chapter 3, Richard C. Heyser, Douglas R. Jones Ed.

Douglas R Jones

This is the third in a series of seven articles written by Richard C. Heyser in 1983. Heyser originally intended to publish this work in AUDIO magazine. This updated version has been edited and annotated by Douglas R. Jones.


Unpublished Writings From Audio Magazine: Proposed Series Chapter 4, Richard C. Heyser, Douglas R. Jones Ed. 2014 Columbia College Chicago

Unpublished Writings From Audio Magazine: Proposed Series Chapter 4, Richard C. Heyser, Douglas R. Jones Ed.

Douglas R Jones

This is the fourth in a series of seven articles written by Richard C. Heyser in 1983. Heyser originally intended to publish this work in AUDIO magazine. This updated version has been edited and annotated by Douglas R. Jones.


Unpublished Writings From Audio Magazine: Proposed Series Chapter 5, Richard C. Heyser, Douglas R. Jones Ed. 2014 Columbia College Chicago

Unpublished Writings From Audio Magazine: Proposed Series Chapter 5, Richard C. Heyser, Douglas R. Jones Ed.

Douglas R Jones

This is the fifth in a series of seven articles written by Richard C. Heyser in 1983. Heyser originally intended to publish this work in AUDIO magazine. This updated version has been edited and annotated by Douglas R. Jones.


Unpublished Writings From Audio Magazine: Proposed Series Chapter 1 And 2, Richard C. Heyser, Douglas R. Jones Ed. 2014 Columbia College Chicago

Unpublished Writings From Audio Magazine: Proposed Series Chapter 1 And 2, Richard C. Heyser, Douglas R. Jones Ed.

Douglas R Jones

These are the first two in a series of seven articles written by Richard C. Heyser in 1983. Heyser originally intended to publish this work in AUDIO magazine. This updated version has been edited and annotated by Douglas R. Jones.


Mechanika Płynów Lab., Wojciech M. Budzianowski 2014 SelectedWorks

Mechanika Płynów Lab., Wojciech M. Budzianowski

Wojciech Budzianowski

No abstract provided.


Tematyka Prac Dyplomowych Dla Studentów Wydziału Chemicznego Pwr., Wojciech M. Budzianowski 2014 SelectedWorks

Tematyka Prac Dyplomowych Dla Studentów Wydziału Chemicznego Pwr., Wojciech M. Budzianowski

Wojciech Budzianowski

No abstract provided.


C.V., Wojciech M. Budzianowski 2014 SelectedWorks

C.V., Wojciech M. Budzianowski

Wojciech Budzianowski

No abstract provided.


H-Index Rankings Of Scientists In Poland, Wojciech M. Budzianowski 2014 SelectedWorks

H-Index Rankings Of Scientists In Poland, Wojciech M. Budzianowski

Wojciech Budzianowski

This contribution provides subject area-specific h-index rankings of scientists in Poland. The rankings use Scopus scientific publications database as a publication and citation resource. 23 subject areas from Scopus are covered. The methodology of the rankings is explained.


Acceptance Of The Autonomy Required For Interplanetary Small Spacecraft Missions By The Scientists Who Will Use The Data, Jeremy Straub 2013 SelectedWorks

Acceptance Of The Autonomy Required For Interplanetary Small Spacecraft Missions By The Scientists Who Will Use The Data, Jeremy Straub

Jeremy Straub

Small spacecraft operating at a distance from Earth are constrained by communications in several ways. The delay between message trans- mission, receipt at Earth, and eventual receipt of a reply can be significant. Further, gain and transmission power limitations (introduced by spacecraft form factor constraints and the resulting limitation on antenna size and power generation capabilities) constrain the amount of data that can be sent and received. This drives a need for mission autonomy: a requirement that the spacecraft be able to manage its own operations and choose the data that it should collect and transmit, based on high-level instructions ...


Investigating Uranus With George: The Gap-Based Expanding Outer Region Geophysical Explorer Mission, Jeremy Straub, Josh Berk, Tyler Hill, Nick Long 2013 SelectedWorks

Investigating Uranus With George: The Gap-Based Expanding Outer Region Geophysical Explorer Mission, Jeremy Straub, Josh Berk, Tyler Hill, Nick Long

Jeremy Straub

This paper presents an overview of a two-part mission to Uranus and its moons. Key questions about the Uranian system remain unanswered which can and should be resolved by this mission. These include gaining an understanding about the offset of Uranus’s magnetic field and its axial tilt. Additional details about the composition and formation of Uranus’s moons are also desired. The mission will be comprised of a primary craft and three 6-U CubeSats. The CubeSats will initially be deployed in Uranian orbit to perform a characterization of the gravity field of the planet. They will then be moved ...


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