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Articles 151 - 173 of 173
Full-Text Articles in Engineering
Intraband Nonlinear Terahertz Waves Absorption Of Gapped Graphene, Asya Tawfiq, Yee Sin Ang, Chao Zhang
Intraband Nonlinear Terahertz Waves Absorption Of Gapped Graphene, Asya Tawfiq, Yee Sin Ang, Chao Zhang
Yee Sin Ang
The effect of bandgap opening on the intraband nonlinear optical response of graphene in terahertz frequency regime is theoretically investigated. The nonlinear optical response of gapped graphene is found to be sensitively influenced by the bandgap level and temperature. © 2012 IEEE.
Nonlinear Optical Spectrum Of Two-Dimensional Electron Gas With Rashba Spin-Orbit Interaction In Thz Frequency Regime, Yee Sin Ang, C Zhang, Qinjun Chen
Nonlinear Optical Spectrum Of Two-Dimensional Electron Gas With Rashba Spin-Orbit Interaction In Thz Frequency Regime, Yee Sin Ang, C Zhang, Qinjun Chen
Yee Sin Ang
We theoretically calculate the nonlinear optical spectrum of two-dimensional electron gas in the presence of Rashba spin-orbit interaction in terahertz frequency regime. For Rashba coupling parameter in the order of 0.4 eVÅ, the nonlinear optical response exceeds the linear response with the application of an external electric field strength in the order of 103 V/cm.
Nonlinear Optical Response Of Graphene Superlattice In Terahertz Frequency Regime, Yee Sin Ang, Chao Zhang
Nonlinear Optical Response Of Graphene Superlattice In Terahertz Frequency Regime, Yee Sin Ang, Chao Zhang
Yee Sin Ang
We investigate the nonlinear optical response of a Kronig-Penney type graphene superlattice in which the Fermi velocity of the massless Dirac quasiparticle anisotropically depends on the direction of propagation. Such velocity anisotropy results in enhanced nonlinear optical response in terahertz frequency regime.
Review Of Four Novel Dosimeters Developed For Use In Radiotherapy, P Metcalfe, A Quinn, K Loo, M Lerch, M Petasecca, J Wong, N Hardcastle, M Carolan, J Mcnamara, D Cutajar, I Fuduli, A Espinoza, C Porumb, Anatoly Rosenfeld
Review Of Four Novel Dosimeters Developed For Use In Radiotherapy, P Metcalfe, A Quinn, K Loo, M Lerch, M Petasecca, J Wong, N Hardcastle, M Carolan, J Mcnamara, D Cutajar, I Fuduli, A Espinoza, C Porumb, Anatoly Rosenfeld
Anthony A Espinoza Mr
Centre for Medical Radiation Physics (CMRP) is a research strength at the University of Wollongong, the main research theme of this centre is to develop prototype novel radiation dosimeters. Multiple detector systems have been developed by Prof Rosenfelds’ group for various radiation detector applications. This paper focuses on four current detector systems being developed and studied at CMRP. Two silicon array detectors include the magic plate and dose magnifying glass (DMG), the primary focus of these two detectors is high spatial and temporal resolution dosimetry in intensity modulated radiation therapy (IMRT) beams. The third detector discussed is the MOSkin which …
A Two Dimensional Silicon Detectors Array For Quality Assurance In Stereotactic Radiotherapy: Magicplate-512, A Aldosari, M Petasecca, A Espinoza, M Newall, I Fuduli, C Porumb, S Alshaikh, Z Alrowaili, M Weaver, P Metcalfe, M Carolan, M. Lerch, V Perevertaylo, A Rosenfeld
A Two Dimensional Silicon Detectors Array For Quality Assurance In Stereotactic Radiotherapy: Magicplate-512, A Aldosari, M Petasecca, A Espinoza, M Newall, I Fuduli, C Porumb, S Alshaikh, Z Alrowaili, M Weaver, P Metcalfe, M Carolan, M. Lerch, V Perevertaylo, A Rosenfeld
Anthony A Espinoza Mr
Purpose: Silicon diode arrays are commonly implemented in radiation therapy quality assurance applications as they have a number of advantages including: real time operation (compared to the film) and high spatial resolution, large dynamic range and small size (compared to ionizing chambers). Most diode arrays have detector pitch that is too coarse for routine use in small field applications. The goal of this work is to characterize the two-dimensional monolithic silicon diode array named "MagicPlate-512" (MP512) designed for QA in stereotactic body radiation therapy (SBRT) and stereotactic radio surgery (SRS). Methods: MP512 is a silicon monolithic detector manufactured on a …
A Comparative Analysis Of Multichannel Data Acquisition Systems For Quality Assurance In External Beam Radiation Therapy, Iolanda Fuduli, Claudiu Porumb, Anthony Espinoza, Abdullah Aldosari, Martin Carolan, Michael Lf Lerch, Peter E. Metcalfe, Anatoly Rosenfeld, Marco Petasecca
A Comparative Analysis Of Multichannel Data Acquisition Systems For Quality Assurance In External Beam Radiation Therapy, Iolanda Fuduli, Claudiu Porumb, Anthony Espinoza, Abdullah Aldosari, Martin Carolan, Michael Lf Lerch, Peter E. Metcalfe, Anatoly Rosenfeld, Marco Petasecca
Anthony A Espinoza Mr
The paper presents a comparative study performed by the Centre of Medical Radiation Physics (CMRP) on three multichannel Data Acquisition Systems (DAQ) based on different analogue front-ends to suit a wide range of radiotherapy applications. The three front-ends are: a charge-to-frequency converter developed by INFN Torino, an electrometer and a charge-to-digital converter (both commercial devices from Texas Instruments). For the first two (named DAQ A and B), the CMRP has designed the read-out systems whilst the third one (DAQ C) comes with its own evaluation board. For the purpose of the characterization DAQ A and DAQ B have been equipped …
The Feasibility Study And Characterziation Of A Two-Dimensional Diode Array In “Magic Phantom” For High Dose Rate Brachytherapy Quality Assurance, A Espinoza, B Beeksma, M Petasecca, I Fuduli, C Porumb, D L. Cutajar, S Corde, M A. Jackson, M Lf Lerch, Anatoly B. Rosenfeld
The Feasibility Study And Characterziation Of A Two-Dimensional Diode Array In “Magic Phantom” For High Dose Rate Brachytherapy Quality Assurance, A Espinoza, B Beeksma, M Petasecca, I Fuduli, C Porumb, D L. Cutajar, S Corde, M A. Jackson, M Lf Lerch, Anatoly B. Rosenfeld
Anthony A Espinoza Mr
High dose rate (HDR) brachytherapy is a radiation treatment technique capable of delivering large dose rates to the tumor. Radiation is delivered using remote afterloaders to drive highly active sources (commonly 192Ir with an air KERMA strength range between 20 000 and 40 000 U, where 1 U = 1 uGy m2/h in air) through applicators directly into the patient's prescribed region of treatment. Due to the obvious ramifications of incorrect treatment while using such an active source, it is essential that there are methods for quality assurance (QA) that can directly and accurately verify the treatment plan and the …
Characterization Of An Innovative P-Type Epitaxial Diode For Dosimetry In Modern External Beam Radiotherapy, A Aldosari, A Espinoza, D Robinson, I Fuduli, C Porumb, S Alshaikh, M Carolan, M Lerch, V Perevertaylo, Anatoly Rosenfeld, M Petasecca
Characterization Of An Innovative P-Type Epitaxial Diode For Dosimetry In Modern External Beam Radiotherapy, A Aldosari, A Espinoza, D Robinson, I Fuduli, C Porumb, S Alshaikh, M Carolan, M Lerch, V Perevertaylo, Anatoly Rosenfeld, M Petasecca
Anthony A Espinoza Mr
Due to the ever-increasing complexity of treatment modalities in radiation therapy, there has been a greater need for detectors to perform quality assurance to ensure patients are treated correctly and safely. Modern radiation therapy techniques involve small field sizes, high dose gradients, and varying intensity of energy and rate. The ideal dosimeter for this treatment should display high spatial resolution, high linearity, accuracy, and radiation hardness. Silicon detectors have been widely used for radiotherapy measurements and have many attractive qualities as a dosimeter; weaknesses of silicon detectors are, however, decreases in sensitivity with accumulated dose. The Centre for Medical Radiation …
X-Tream: A Novel Dosimetry System For Synchrotron Microbeam Radiation Therapy, M Petasecca, A Cullen, I Fuduli, A Espinoza, C Porumb, C Stanton, A H. Aldosari, E Brauer-Krisch, H Requardt, A Bravin, V Perevertaylo, Anatoly B. Rosenfeld, M L. F Lerch
X-Tream: A Novel Dosimetry System For Synchrotron Microbeam Radiation Therapy, M Petasecca, A Cullen, I Fuduli, A Espinoza, C Porumb, C Stanton, A H. Aldosari, E Brauer-Krisch, H Requardt, A Bravin, V Perevertaylo, Anatoly B. Rosenfeld, M L. F Lerch
Anthony A Espinoza Mr
Microbeam Radiation Therapy (MRT) is a radiation treatment technique under development for inoperable brain tumors. MRT is based on the use of a synchrotron generated X-ray beam with an extremely high dose rate ( ~ 20 kGy/sec), striated into an array of X-ray micro-blades. In order to advance to clinical trials, a real-time dosimeter with excellent spatial resolution must be developed for absolute dosimetry. The design of a real-time dosimeter for such a radiation scenario represents a significant challenge due to the high photon flux and vertically striated radiation field, leading to very steep lateral dose gradients. This article analyses …
Multichannel Data Acquisition System Comparison For Quality Assurance In External Beam Radiation Therapy, I Fuduli, M Newall, A Espinoza, C Porumb, M Carolan, M. Lerch, P Metcalfe, A Rosenfeld, M Petasecca
Multichannel Data Acquisition System Comparison For Quality Assurance In External Beam Radiation Therapy, I Fuduli, M Newall, A Espinoza, C Porumb, M Carolan, M. Lerch, P Metcalfe, A Rosenfeld, M Petasecca
Anthony A Espinoza Mr
Megavoltage photon radiation therapies are widely used in modern cancer treatment. The improvement of the treatment has lead to the need of Quality Assurance (QA) devices to detect malfunctioning or human mistakes during the planning phase and treatment verification. Active electronic devices for 2D or 3D QA in external beam radiotherapy are typically based on analogue/digital mixed signal Data Acquisition Systems (DAS) which are required to have high spatial resolution, large dynamic range, high sensitivity, large numbers of channels and fast real-time capabilities. The Centre of Medical Radiation Physics (CMRP) has developed several multichannel DAS architectures based on different analogue …
Wonder-Worlds Of Words, Sandra A. Yocum
Wonder-Worlds Of Words, Sandra A. Yocum
Sandra A. Yocum
An essay on the impact of the works in the Imprints and Impressions: Milestones in Human Progress, an exhibition of rare books from the collection of Stuart Rose. Exhibition was held Sept. 29-Nov. 9, 2014, at the University of Dayton.
Exhibition Catalogue — Imprints And Impressions: Milestones In Human Progress, Paul H. Benson, Sandra A. Yocum, Mark Masthay, Donald J. Polzella
Exhibition Catalogue — Imprints And Impressions: Milestones In Human Progress, Paul H. Benson, Sandra A. Yocum, Mark Masthay, Donald J. Polzella
Sandra A. Yocum
Exhibition catalogue for Imprints and Impressions: Milestones in Human Progress — Highlights from the Rose Rare Book Collection. Includes an introduction by Kathleen M. Webb, dean of University Libraries; essays about the impact of the exhibition's books on modern inquiry, the humanities, the sciences, and the social sciences; and photographs of the works in the exhibit.
Optimal Energy For Cell Radiosensitivity Enhancement By Gold Nanoparticles Using Synchrotron-Based Monoenergetic Photon Beams, Wan Nordiana Rahman, Stephanie Corde, Naoto Yagi, Siti Aishah Abdul Aziz, Nathan Annabell, Moshi Geso
Optimal Energy For Cell Radiosensitivity Enhancement By Gold Nanoparticles Using Synchrotron-Based Monoenergetic Photon Beams, Wan Nordiana Rahman, Stephanie Corde, Naoto Yagi, Siti Aishah Abdul Aziz, Nathan Annabell, Moshi Geso
Stéphanie Corde
Gold nanoparticles have been shown to enhance radiation doses delivered to biological targets due to the high absorption coefficient of gold atoms, stemming from their high atomic number (Z) and physical density. These properties significantly increase the likelihood of photoelectric effects and Compton scattering interactions. Gold nanoparticles are a novel radiosensitizing agent that can potentially be used to increase the effectiveness of current radiation therapy techniques and improve the diagnosis and treatment of cancer. However, the optimum radiosensitization effect of gold nanoparticles is strongly dependent on photon energy, which theoretically is predicted to occur in the kilovoltage range of energy. …
Exhibition Handlist, Kathleen M. Webb
Exhibition Handlist, Kathleen M. Webb
Kathleen M. Webb
In preparing for Imprints and Impressions, we ran across many interesting words that have fallen out of the general lexicon. With this booklet, we have brought one back: handlist. Dean Kathleen Webb ran across it in a 1944 booklet from the J. Pierpont Morgan Library in New York City. Though the word no longer appears in most new dictionaries, it’s still in the Oxford English Dictionary: A list of a particular type or category of things, presented in a readily consultable form; esp. a list of the books or manuscripts in a particular place, on a particular subject, etc.; a …
Depth Image Super-Resolution Using Multi-Dictionary Sparse Representation, Haoheng Zheng, Abdesselam Bouzerdoum, Son Lam Phung
Depth Image Super-Resolution Using Multi-Dictionary Sparse Representation, Haoheng Zheng, Abdesselam Bouzerdoum, Son Lam Phung
Haoheng Zheng
In this paper, we propose a new depth super-resolution technique based on multiple dictionary learning. A novel dictionary selection method using basis pursuit is proposed to generate multiple dictionaries adaptively. A sparse representation of each low-resolution input patch is derived based on the learned dictionaries, and then used to reconstruct the corresponding high-resolution patch. Experimental results are presented which show that the proposed multi-dictionary scheme outperforms existing depth super-resolution methods.
Nanotechnology Companies In The United States: A Web-Based Content Analysis Of Companies And Products For Poverty Alleviation, Thomas Woodson
Nanotechnology Companies In The United States: A Web-Based Content Analysis Of Companies And Products For Poverty Alleviation, Thomas Woodson
Thomas Woodson
This study analyzes the goals, nanotechnology experience, corporate social responsibility and products of 50 USA-based companies working with nanotechnology to see if they are developing products that help low-income populations. Out of the top 50 R&D companies that publish and patent nanotechnology research in agri-food, energy and water sectors, 18 of them do not mention nanotechnology on their websites. The other 32 companies discuss nanotechnology in varying degrees. However, only two of the companies relate their nanotechnology R&D to poverty alleviation. Even though few companies refer to poverty alleviation, 30 firms of the sample have some type of corporate social …
In Search Of Standards For The Operation Of Small Satellites, Jeremy Straub
In Search Of Standards For The Operation Of Small Satellites, Jeremy Straub
Jeremy Straub
This paper considers the need for standards for the operations of small spacecraft. First, it considers a definition for what a small spacecraft is and discusses the elusiveness of this definition. Then, the paper turns to the ‘large space’ community and it examines their fears about small spacecraft as well as the operating paradigms that they are used to and how these drive their expectations for the operations of small spacecraft. Next, a prospective composition for a preliminary set of operating standards is discussed. Finally, a discussion of the benefits of standardization and what the different communities could expect to …
Characterization Of Bovine Serum Albumin Partitioning Behaviors In Polymer-Salt Aqueous Two-Phase Systems, Eng-Poh Ng Dr.
Characterization Of Bovine Serum Albumin Partitioning Behaviors In Polymer-Salt Aqueous Two-Phase Systems, Eng-Poh Ng Dr.
Eng-Poh Ng
No abstract provided.
Lib 3010 Spring 2015: Students Choose An Image To Represent Patent Searching, Jan Comfort
Lib 3010 Spring 2015: Students Choose An Image To Represent Patent Searching, Jan Comfort
Jan Comfort
Students enrolled in LIB 3010 (a one hour credit-bearing class on Patent Searching) were asked to submit an image and write a few sentences describing how it represented their experience.
Lib 3010 Fall 2015: Students Choose An Image To Represent Patent Searching, Jan Comfort
Lib 3010 Fall 2015: Students Choose An Image To Represent Patent Searching, Jan Comfort
Jan Comfort
Students enrolled in LIB 3010 (a one hour credit-bearing class on patent searching) were asked to submit an image and write a few sentences describing how it represented their experience.
A Review And Evaluation Of Services And Resources To Engineers: A Case Study Of Outreach And Marketing, Assessment, And Future Directions In A Research Library, Matt Torrence
Matt Torrence
Engineering student and faculty populations present a beneficial and unique challenge to libraries and the information science community. The literature, activities, and resource needs of this group provide insight into a demographic that is often among the early-adopters of new technologies, tools, and methods of sharing information. Despite the often non-bibliographic nature of their research efforts, there are numerous elements of the traditional service model that remain relevant and integral to the engineering research patron base. New methods of live and virtual instruction, the improved promotion of research consultation, and data management are prime targets for efficient and effective service …
Safety, Resilience & Crew-Centred Design In Maritime Operations, Gesa Praetorius
Safety, Resilience & Crew-Centred Design In Maritime Operations, Gesa Praetorius
Gesa Praetorius
Presentation given at a research seminar in fall 2015 in Kalmar.
Book Review, Earthea Nance
Book Review, Earthea Nance
Earthea Nance, PhD (Stanford University, 2004)
Book Review published in the journal Water International (2015) The topic… “The book builds upon Nance’s research and presents a comprehensive account of Brazil’s experience of implementing condominial sewerage.” The topic… “From the very beginning, the author expresses her concerns in escaping from preconceived ideas about conventional and participatory development, positioning her views within a third wave of post-structural development discourse, neither universalist nor relativist, that is neither denying nor overvaluing the social content of development.” Research methods… “Nance manages to do so by integrating different areas of established knowledge and examining her research issue from a privileged historical perspective. …