Open Access. Powered by Scholars. Published by Universities.®
Science and Technology Studies Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Engineering (357)
- Public Affairs, Public Policy and Public Administration (307)
- Public Policy (177)
- Policy Design, Analysis, and Evaluation (143)
- Communication (135)
-
- Science and Technology Policy (130)
- Communication Technology and New Media (114)
- Law (105)
- Sociology (104)
- Business (96)
- Technology and Innovation (86)
- Physical Sciences and Mathematics (72)
- Political Science (72)
- Economics (68)
- Library and Information Science (58)
- Arts and Humanities (51)
- Industrial Organization (47)
- Comparative Politics (43)
- Intellectual Property Law (43)
- Strategic Management Policy (40)
- Computer Sciences (39)
- Urban Studies and Planning (38)
- Law and Society (37)
- Life Sciences (35)
- Education (34)
- Environmental Policy (34)
- Other Engineering (33)
- Policy History, Theory, and Methods (33)
- Institution
- Keyword
-
- Telecommunications (26)
- Nanotechnology (24)
- Regulation (18)
- Trace (17)
- Membrane (16)
-
- Removal (16)
- High (15)
- Organic (15)
- Privacy and Data Protection (15)
- Broadband (14)
- Privacy (14)
- Behaviour (13)
- Networks (13)
- Analysis (12)
- Innovation (12)
- Science and Innovacion Policy / Políticas de Ciencia e Innovación (12)
- Security (12)
- Treatment (12)
- Voltage (12)
- Bioreactor (11)
- Data (11)
- Distribution (11)
- During (11)
- Foresight (11)
- History of Science and Technology (11)
- Model (11)
- Technology (11)
- Control (10)
- Era2015 (10)
- Power (10)
- Publication Year
- Publication
-
- Michael Friedewald (49)
- Scott J. Wallsten (36)
- Manuel Fernández-Esquinas (35)
- Faisal I Hai (30)
- Philip Shapira (25)
-
- Dr Philip Ciufo (22)
- Professor Willy Susilo (21)
- Associate Professor Adam Rennie (20)
- Buddhima Indraratna (20)
- Daniel P Aldrich (18)
- Robert Hoppe (18)
- Paul F. Eschenfelder (15)
- Professor Katina Michael (14)
- Thomas A Faunce (14)
- alan l porter (14)
- Brian Monaghan (13)
- Paul Swamidass (12)
- William E. Price (12)
- Cholachat Rujikiatkamjorn (11)
- Michael J. Paulus, Jr. (11)
- Associate Professor Katina Michael (10)
- Li Tang (10)
- Dr Lasantha G Meegahapola (9)
- Nagesh Shukla (9)
- victor toom (9)
- Jules Simon (8)
- M. G. Michael (8)
- Shi Xue Dou (8)
- Stéphanie Corde (8)
- Krista M. Harper (7)
Articles 331 - 360 of 830
Full-Text Articles in Science and Technology Studies
Offline Programming For Short Batch Robotic Welding, Nathan Larkin, Aleksandar Milojevic, Zengxi Pan, Joseph Polden, John Norrish
Offline Programming For Short Batch Robotic Welding, Nathan Larkin, Aleksandar Milojevic, Zengxi Pan, Joseph Polden, John Norrish
zengxi pan
Robotics based automation has many advantages over both manual operation and dedicated hard automation. In practice however the robot programming overhead and high cost of dedicated jigging are serious impediments to its use for short production runs. Offline programming packages offer an attractive alternative to reduce programming time and robot down time, however many of the available packages are fairly complex and treat the geometric programming and welding operation separately. The paper will describe the development of alternative approaches and the evaluation of an integrated offline robotic welding package (RinasWeld) which addresses these issues and makes low volume robotic welding …
Methods For Usability Evaluations Of Mobile Devices, Fayez Alshehri, Mark Freeman
Methods For Usability Evaluations Of Mobile Devices, Fayez Alshehri, Mark Freeman
Dr Mark Freeman
The usability of applications designed and developed for mobile devices integral user experience, particularly for current touch-screen mobile devices. This conceptual paper provides a profile of the ways in which mobile device usability evaluation methods are being adapted to better reflect technological. With an increasing capacity for greater user interactivity through a range of tasks and in a variety of contexts, the importance and impact of mobile device context-of-use components is of particular interest to researchers. This requires a need for a shift in evaluation method paradigms with a particular focus on methods involving the user, as part of the …
Complementary Techniques For Probing Terahertz Magnetic Excitations In Cu3bi(Seo3)2o2cl, K H. Miller, E Constable, H Berger, D B. Tanner, J Horvat, R A. Lewis
Complementary Techniques For Probing Terahertz Magnetic Excitations In Cu3bi(Seo3)2o2cl, K H. Miller, E Constable, H Berger, D B. Tanner, J Horvat, R A. Lewis
Josip Horvat
A low frequency magnetic excitation in Cu3Bi(SeO 3)2O2Cl has been studied through complementary spectroscopic techniques which utilised terahertz radiation from a synchrotron, a mercury arc lamp, and a two-colour photomixing system. The excitation has been studied at temperatures down to 5K and in magnetic fields up to 10T. © 2012 IEEE.
Simplifying Inventive Standards (Part-2), Umakant Mishra
Simplifying Inventive Standards (Part-2), Umakant Mishra
Umakant Mishra
In the previous article we discussed all the standard solutions in class-1. In this article we will discuss all the standard solutions in class-2. The standards of class 2 intend to improve the system without inserting too much changes to the system and without increasing the complexity of the system. These standards guide how to use chain SFields, Double SFields and complex S-Field Models.
Science And Non-Science, Hippu Salk Kristle Nathan
Science And Non-Science, Hippu Salk Kristle Nathan
Hippu Salk Kristle Nathan
No abstract provided.
Simplifying Inventive Standards (Part-1), Umakant Mishra
Simplifying Inventive Standards (Part-1), Umakant Mishra
Umakant Mishra
Although “Inventive Standards” (or standard solutions) is one of the most powerful techniques of TRIZ it is hardly used by any TRIZ practitioner because of its complicacy. This article describes the rules of “inventive standards” in simple language one by one for all the standards of class-I. The standards of other classes are described in separate articles.
The Study Of Flood Hydraulics Before The Building Of Maroon Dam By Hec-Ras, Maskingam And Muskingum - Cunge Method, Mohammad Hossein Naghshine, Farhad Fakheri Raof, Ali Khoshrftar
The Study Of Flood Hydraulics Before The Building Of Maroon Dam By Hec-Ras, Maskingam And Muskingum - Cunge Method, Mohammad Hossein Naghshine, Farhad Fakheri Raof, Ali Khoshrftar
Farhad Fakheri Raof
Routing of rivers which flow through the important areas is from the important river engineering measures. In this research, flood routing in the Maroon River has been studied bases on hydrometric stations between Behbahan and Chamnezam. Todays, numerical computer methods are developed for the Cent and Nante equations. The HEC-RAS software and Muskingum and Muskingum - corners methods are used for this work. HEC-RAS model with solving of dynamic equations motion simulates unsteady flow in the form of onedimensional flow in open channels. After calibration and testing, the results of these methods were compared.So, the HEC-RAS model results considerably better …
The Effect Of Degradation On Seismic Damage Of Rc Buildings, Ali Khoshraftar, Reza Abbasnia, Farhad Fakheri Raof
The Effect Of Degradation On Seismic Damage Of Rc Buildings, Ali Khoshraftar, Reza Abbasnia, Farhad Fakheri Raof
Farhad Fakheri Raof
The severity of seismic damage of reinforced concrete buildings depends on the tectonic characteristics of area, seismic features of ground motion, quality and quantity of buildings. One of the most important factor's, affecting the seismic damage, is the degrading rate of building. Degradation of stiffness and strength are the parameters, which their effect on the seismic damage of buildings are investigated, using an inelastic dynamic analysis. The buildings which are studied are moment resisting RC frames. In order to study the inelastic dynamic behavior of these buildings, IDARC software is used. Based on the obtained results, 40% degradation of strength …
A New Hybrid Reality For Libraries, Pin Pin Yeo
A New Hybrid Reality For Libraries, Pin Pin Yeo
YEO Pin Pin
Parag Khanna explored the different trends that have brought us to what he terms the “Hybrid Age”, which is digital, global, and as well as social. Libraries continue to play an important role in this because they are uniquely positioned.
Optical Solitary Waves In Thermal Media With Non-Symmetric Boundary Conditions, Simon Louis, Timothy R. Marchant, Noel F. Smyth
Optical Solitary Waves In Thermal Media With Non-Symmetric Boundary Conditions, Simon Louis, Timothy R. Marchant, Noel F. Smyth
Tim Marchant
Optical spatial solitary waves are considered in a nonlocal thermal focusing medium with non-symmetric boundary conditions. The governing equations consist of a nonlinear Schrödinger equation for the light beam and a Poisson equation for the temperature of the medium. Three numerical methods are investigated for calculating the ground and excited solitary wave solutions of the coupled system. It is found that the Newton conjugate gradient method is the most computationally efficient and versatile numerical technique. The solutions show that by varying the ambient temperature, the solitary wave is deflected towards the warmer boundary. Solitary wave stability is also examined both …
Determining The Vertical Profile Of Reflectivity Using Radar Observations At Long Range, Kate Snow, Alan Seed, George Takacs
Determining The Vertical Profile Of Reflectivity Using Radar Observations At Long Range, Kate Snow, Alan Seed, George Takacs
George Takacs
The Vertical Profile of Reflectivity (VPR) plays an important role when estimating the rain rate at the surface and has been the subject of radar meteorology research for many years. The VPR can either be sampled directly from observations that are close to the radar where the impact of the convolution with the beam pattern can be ignored, or the parameters for a theoretical form for the VPR are estimated using the available observations or climatology. In either case, a significant difficulty arises when a rain band approaches the radar and quantitative precipitation estimates are required before any detailed observations …
Development And Validation Of A Concept Inventory For Introductory-Level Climate Change Science, Lorna Jarrett, Brian Ferry, George Takacs
Development And Validation Of A Concept Inventory For Introductory-Level Climate Change Science, Lorna Jarrett, Brian Ferry, George Takacs
George Takacs
This paper follows on from Jarrett, Takacs and Ferry (2011) which reported the first stage in development of a high school level concept inventory (CI) for the science of climate change: the climate change concept inventory (CCCI). In order to develop a reliable and valid instrument, it is necessary to follow appropriate procedures. This paper details the process of CI item development; reports statistical results of initial field trials and outlines how these will be used to further refine the CCCI. Item difficulty, discrimination, and point biserial coefficient were calculated for each item. Cronbach's alpha and test-retest data were used …
Predicting The Fate Of Emerging Trace Organic Contaminants Of Concern During Mbr Treatment Based On Their Molecular Properties, K C. Wijekoon, L D. Nghiem, F I. Hai, J Kang, W E. Price
Predicting The Fate Of Emerging Trace Organic Contaminants Of Concern During Mbr Treatment Based On Their Molecular Properties, K C. Wijekoon, L D. Nghiem, F I. Hai, J Kang, W E. Price
Faisal I Hai
We demonstrate that the fate of emerging trace organic contaminants during membrane bioreactor (MBR) treatment can be qualitatively predicted by assessing their molecular properties. This work futher expands the qualitative framework for the prdiction of trace organic removal by MBR treatment reported in our recent study.
Enhanced Biological Phosphorus Removal And Its Modeling For The Activated Sludge And Membrane Bioreactor Processes, M F. R Zuthi, W S. Guo, H H. Ngo, L D. Nghiem, F I. Hai
Enhanced Biological Phosphorus Removal And Its Modeling For The Activated Sludge And Membrane Bioreactor Processes, M F. R Zuthi, W S. Guo, H H. Ngo, L D. Nghiem, F I. Hai
Faisal I Hai
A modified activated sludge process (ASP) for enhanced biological phosphorus removal (EBPR) needs to sustain stable performance for wastewater treatment to avoid eutrophication in the aquatic environment. Unfortunately, the overall efficiency of the EBPR in ASPs and membrane bioreactors (MBRs) is frequently hindered by different operational/system constraints. Moreover, although phosphorus removal data from several wastewater treatment systems are available, a comprehensive mathematical model of the process is still lacking. This paper presents a critical review that highlights the core issues of the biological phosphorus removal in ASPs and MBRs while discussing the inhibitory process requirements for other nutrients' removal. This …
Removal Of N-Nitrosamines By An Aerobic Membrane Bioreactor, Kaushalya C. Wijekoon, Takahiro Fujioka, James A. Mcdonald, Stuart J. Khan, Faisal I. Hai, William E. Price, Long D. Nghiem
Removal Of N-Nitrosamines By An Aerobic Membrane Bioreactor, Kaushalya C. Wijekoon, Takahiro Fujioka, James A. Mcdonald, Stuart J. Khan, Faisal I. Hai, William E. Price, Long D. Nghiem
Faisal I Hai
This study investigated the fate of eight N-nitrosamines during membrane bioreactor (MBR) treatment. The results suggest that biodegradation is mainly responsible for the removal of N-nitrosamines during MBR treatment. Other removal mechanisms were insignificant (e.g. adsorption to sludge) or not expected (e.g. photolysis and volatilization) given the experimental conditions and physicochemical properties of the N-nitrosamines studied here. N-nitrosamine removal efficiencies were from 24% to 94%, depending on their molecular properties. High removal of N-nitrosamines such as N-nitrosodimethylamine and N-nitrosodiethylamine could be explained by the presence of strong electron donating functional groups (EDG) in their structure. In contrast, N-nitrosomorpholine possessing the …
Data Driven Encoding Of Structures And Link Predictions In Large Xml Document Collections, M Hagenbuchner, A C. Tsoi, M Kc, Shujia Zhang
Data Driven Encoding Of Structures And Link Predictions In Large Xml Document Collections, M Hagenbuchner, A C. Tsoi, M Kc, Shujia Zhang
Ah Chung Tsoi
In recent years there have been some significant research towards the ability of processing related data, particularly the relatedness among atomic elements in a structure with those in another structure. A number of approaches have been developed with various degrees of success. This chapter provides an overview of machine learning approaches for the encoding of related atomic elements in one structure with those in other structures. The chapter briefly reviews a number of unsupervised approaches for such data structures which can be used for solving generic classification, regression, and clustering problems. We will apply this approach to a particularly interesting …
Neural Network Classification And Prior Class Probabilities, Steve Lawrence, Ian Burns, Andrew Back, Ah Chung Tsoi, C Lee Giles
Neural Network Classification And Prior Class Probabilities, Steve Lawrence, Ian Burns, Andrew Back, Ah Chung Tsoi, C Lee Giles
Ah Chung Tsoi
A commonly encountered problem in MLP (multi-layer perceptron) classification problems is related to the prior probabilities of the individual classes - if the number of training examples that correspond to each class varies significantly between the classes, then it may be harder for the network to learn the rarer classes in some cases. Such practical experience does not match theoretical results which show that MLPs approximate Bayesian a posteriori probabilities (independent of the prior class probabilities). Our investigation of the problem shows that the difference between the theoretical and practical results lies with the assumptions made in the theory (accurate …
Discrete Element Modelling: Trouble-Shooting And Optimisation Tool For Chute Design, Andrew P. Grima, Thomas Fraser, David B. Hastie, Peter W. Wypych
Discrete Element Modelling: Trouble-Shooting And Optimisation Tool For Chute Design, Andrew P. Grima, Thomas Fraser, David B. Hastie, Peter W. Wypych
David Hastie
Conveyor transfer stations play a key role in many industries that handle bulk materials. Transfer stations can be rather sensitive to changes in material properties and can lead to relentless problems regarding reliability, wear, bottlenecking and blockages. Wet and sticky ores are typically difficult to handle materials due to their obnoxious ability to form a cohesive arch, adhere to surfaces and poor flow ability. Mines that are situated in areas with seasonal high rainfalls or that have started to exploit newer and more difficult to mine and handle ores, often from below the water table, experience vast difficulty in reliably …
Predication Of The Behaviour Of Bulk Materials In The Design And Operation Of Bulk Handling And Processing Plants, David Hastie, Peter Wypych, Andrew Grima, Richard La Roche, David Curry
Predication Of The Behaviour Of Bulk Materials In The Design And Operation Of Bulk Handling And Processing Plants, David Hastie, Peter Wypych, Andrew Grima, Richard La Roche, David Curry
David Hastie
It is very dangerous to assume or extrapolate anything when it comes to bulk material properties and behaviour. Traditional methods for flow prediction, such as hand calculation or even just relying on past experience, require assumptions to be made about the bulk material properties and flow. Although these materials may have generic names and possess similar properties (e.g. coal, iron ore), they can all behave quite differently under dynamic conditions. What we end up designing for one part of the plant may be quite different to what is needed in another part of the plant, which may be handling or …
The Beginning Of A New Era In Design: Calibrated Discrete Element Modelling, Andrew Grima, David Hastie, David Curry, Peter Wypych, Richard La Roche
The Beginning Of A New Era In Design: Calibrated Discrete Element Modelling, Andrew Grima, David Hastie, David Curry, Peter Wypych, Richard La Roche
David Hastie
The reliable storage and flow of bulk materials requires a comprehensive design process and good understanding of the flow properties of a bulk material. Analytical and empirical design techniques form the backbone of many design processes as they have been validated by research, however, theories based on continuum mechanics have many shortcomings and are restricted to 2-D analysis. Discrete element modelling (DEM) is proving to be a popular analysis and simulation method to verify designs for a wide range of bulk material processing and handling operations, such as transfer chutes. With the advances in computing and DEM technology, DEM has …
Enhancement Of The Refrigerant Capacity In Low Level Boron Doped La0.8gd0.2fe11.4si1.6, P Shamba, R Zeng, Jianli Wang, S J. Campbell, S X. Dou
Enhancement Of The Refrigerant Capacity In Low Level Boron Doped La0.8gd0.2fe11.4si1.6, P Shamba, R Zeng, Jianli Wang, S J. Campbell, S X. Dou
Jianli Wang
The effects of boron doping on the itinerant-electron metamagnetic (IEM) transition and the magnetocaloric effects (MCEs) in the cubic NaZn13-type La0.8Gd0.2Fe11.4Si1.6 compound have been investigated. The Curie temperature, TC, of La0.8Gd0.2Fe11.4Si1.6Bx compounds with x=0, 0.03, 0.06, 0.2 and 0.3 was found to increase from 200 K to 222 K with increase in boron doping, x. The maximum values of the isothermal magnetic entropy change, ΔSM, (derived using the Maxwell relation for a field change ΔB=0-5 T) in La0.8Gd0.2Fe11.4Si1.6Bx with x=0, 0.03, 0.06, 0.2 and 0.3 are 14.8, 16, 15, 7.5 and 6.6 J kg−1 K−1 respectively, with corresponding values of …
The Magnetocaloric Effect And Critical Behaviour Of The Mn0.94ti0.06coge Alloy, P Shamba, Jianli Wang, J C. Debnath, S J. Kennedy, Rong Zeng, M F Md Din, F Hong, Z X. Cheng, A J. Studer, S X. Dou
The Magnetocaloric Effect And Critical Behaviour Of The Mn0.94ti0.06coge Alloy, P Shamba, Jianli Wang, J C. Debnath, S J. Kennedy, Rong Zeng, M F Md Din, F Hong, Z X. Cheng, A J. Studer, S X. Dou
Jianli Wang
Structural, magnetic and magnetocaloric properties of the Mn0.94Ti0.06CoGe alloy have been investigated using x-ray diffraction, DC magnetization and neutron diffraction measurements. Two phase transitions have been detected, at T-str = 235 K and T-C = 270 K. A giant magnetocaloric effect has been obtained at around Tstr associated with a structural phase transition from the low temperature orthorhombic TiNiSi-type structure to the high temperature hexagonal Ni2In-type structure, which is confirmed by neutron study. In the vicinity of the structural transition, at T-str, the magnetic entropy change, -Delta S-M reached a maximum value of 14.8 J kg(-1) K-1 under a magnetic …
The Effect Of Slag Basicity On Spinal Inclusion Wettability, Hamed Abdeyazdan, Brian J. Monaghan, Neslihan Dogan, M Akbar Rhamdhani
The Effect Of Slag Basicity On Spinal Inclusion Wettability, Hamed Abdeyazdan, Brian J. Monaghan, Neslihan Dogan, M Akbar Rhamdhani
Brian Monaghan
Steel cleanness is an important and growing research area driven by the demands to produce high quality steel. Inclusion content in steel is an important criterion to assess clean steel. MgO.Ah03 spinel inclusions cause problems in steel processing and are generally deleterious to steel products due to their high melting point and high hardness. Jnclusions are generally r· moved by rea ting with slag. This is primarily achieved by optimizing lhe PI' 'ess omliLions to promote contact and reaction between the inclusion and S,l,lg '. or efticient rem val from the steel the inclusions must attach to and dissolve in …
Thermodynamic Assessment Of Aluminium Production Through Carbosulphidation Route, Nazmul Huda, Muhammad A. Rhamdhani, M A. Dewan, Geoffrey A. Brooks, B J. Monaghan, L Prentice
Thermodynamic Assessment Of Aluminium Production Through Carbosulphidation Route, Nazmul Huda, Muhammad A. Rhamdhani, M A. Dewan, Geoffrey A. Brooks, B J. Monaghan, L Prentice
Brian Monaghan
Indirect carbothermal reduction of alumina for the production of aluminium has been claimed to be better compared to the existing Hall-Heroult process in-terms of energy usage, generation of perfluorocarbons and overall greenhouse gas emission. In the process, alumina is reduced to an intermediate compound which is then further reduced to Al. It has been shown from the previous thermodynamic study by the authors that high conversion of alumina can be obtained if it is reduced to Al-chloride, Al-nitride or Al-sulphide. This paper deals with detailed systematic thermodynamic analysis of the process through carbosulphidation route, where alumina is first reduced to …
Aluminium Production Route Through Carbosulfidation Of Alumina Utilising H2s, Nazmul Huda, M Akbar Rhamdhani, G A. Brooks, B J. Monaghan, L Prentice
Aluminium Production Route Through Carbosulfidation Of Alumina Utilising H2s, Nazmul Huda, M Akbar Rhamdhani, G A. Brooks, B J. Monaghan, L Prentice
Brian Monaghan
Indirect carbothermal reduction of alumina for the production of aluminum utilizes different reducing agents to convert alumina into intermediate aluminum compounds. In the present study, the carbosulfidation route for aluminum production utilizing H2S(g) as the reductant and sulfur source has been investigated, in particular the formation of AhS3 in the first step of the process. The results of the thermodynamic analysis predicted that conversion of Ah03(S) to AhS3(l) significantly increases above 1400°C at 1 atmosphere pressure. Experimental investigations were carried out at temperatures of 1100 to 1500°C using dilute H2S(g) gas in argon. The reaction products were analyzed using scanning …
Nanoscale Characterization Of Ion Tracks: Mc Simulations Versus Analytical Approach, M U. Bug, E Surdutovich, H Rabus, Anatoly B. Rosenfeld, A V. Solov'yov
Nanoscale Characterization Of Ion Tracks: Mc Simulations Versus Analytical Approach, M U. Bug, E Surdutovich, H Rabus, Anatoly B. Rosenfeld, A V. Solov'yov
Anatoly Rozenfeld
The goal of this work was to investigate the agreement of physical parameters related to the particle track structure on the nanometer scale, obtained by means of a detailed track structure simulation (PTra) as well as by a rapid analytical approach. Parameters describing the tracks of secondary electrons produced by 0.3 MeV/u C6+-ions were of particular interest as those particles are densely ionizing. For this purpose, the target volume in form of a nanometric water cylinder was positioned at different radial distances from the ion trajectory and track structure parameters were determined as function of the radial distance. While the …
Advanced Semiconductor Dosimetry In Radiation Therapy, Anatoly B. Rosenfeld
Advanced Semiconductor Dosimetry In Radiation Therapy, Anatoly B. Rosenfeld
Anatoly Rozenfeld
Modern radiation therapy is very conformal, resulting in a complexity of delivery that leads to many small radiation fields with steep dose gradients, increasing error probability. Quality assurance in delivery of such radiation fields is paramount and requires real time and high spatial resolution dosimetry. Semiconductor radiation detectors due to their small size, ability to operate in passive and active modes and easy real time multichannel readout satisfy many aspects of in vivo and in a phantom quality assurance in modern radiation therapy. Update on the recent developments and improvements in semiconductor radiation detectors and their application for quality assurance …
A Real-Time In Vivo Dosimetric Verification Method For High-Dose Rate Intracavitary Brachytherapy Of Nasopharyngeal Carcinoma, Zhen-Yu Qi, Xiao-Wu Deng, X Cao, Shao-Min Huang, Michael L. Lerch, Anatoly B. Rosenfeld
A Real-Time In Vivo Dosimetric Verification Method For High-Dose Rate Intracavitary Brachytherapy Of Nasopharyngeal Carcinoma, Zhen-Yu Qi, Xiao-Wu Deng, X Cao, Shao-Min Huang, Michael L. Lerch, Anatoly B. Rosenfeld
Anatoly Rozenfeld
Purpose: A real-time in vivo dosimetric verification method using metal-oxide-semiconductor field effect transistor (MOSFET) dosimeters has been developed for patient dosimetry in high-dose rate (HDR) intracavitary brachytherapy of nasopharyngeal carcinoma (NPC). Methods: The necessary calibration and correction factors for MOSFET measurements in 192Iridium source were determined in a water phantom. With the detector placed inside a custom-made nasopharyngeal applicator, the actual dose delivered to the tumor was measured in vivo and compared to the calculated values using a commercial brachytherapy planning system. Results: Five MOSFETs were independently calibrated with the HDR source, yielding calibration factors of 0.48 ± 0.007 cGymV. …
Improvements In Dose Calculation Accuracy For Small Off-Axis Targets In High Dose Per Fraction Tomotherapy, Nicholas Hardcastle, Adam Bayliss, Jeannie Wong, Anatoly B. Rosenfeld, Wolfgang A. Tome
Improvements In Dose Calculation Accuracy For Small Off-Axis Targets In High Dose Per Fraction Tomotherapy, Nicholas Hardcastle, Adam Bayliss, Jeannie Wong, Anatoly B. Rosenfeld, Wolfgang A. Tome
Anatoly Rozenfeld
Purpose: A recent field safety notice from TomoTherapy detailed the underdosing of small, off-axis targets when receiving high doses per fraction. This is due to angular undersampling in the dose calculation gantry angles. This study evaluates a correction method to reduce the underdosing, to be implemented in the current version (v4.1) of the TomoTherapy treatment planning software. Methods: The correction method, termed "Super Sampling" involved the tripling of the number of gantry angles from which the dose is calculated during optimization and dose calculation. Radiochromic film was used to measure the dose to small targets at various off-axis distances receiving …
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
Anatoly Rozenfeld
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 …