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Full-Text Articles in Engineering
An Investigation On The Impacts Of Density Currents On The Sedimentation In Dam Reservoirs Using Tcm Model; Case Study: Maroon Dam, Farhad Raof, Mohammad Naghshine, Ali Khoshrftar
An Investigation On The Impacts Of Density Currents On The Sedimentation In Dam Reservoirs Using Tcm Model; Case Study: Maroon Dam, Farhad Raof, Mohammad Naghshine, Ali Khoshrftar
Farhad Fakheri Raof
Sedimentation in dams' reservoirs is one of the most pressing concerns facing dams today. Maroon reservoir dam, located in Khuzestan Province, is one of the most important dams in this region. Since it is a new constructed dam, numerical simulation of sedimentation trend in its reservoirs could significantly help on a better utilization. To this end, TCM model which is capable to simulate density currents was used. The obtained results show that the dam loses about 91 million m3 of its reservoirs during a 50-year exploitation period.
Monte Carlo Study Of The Energy Response And Depth Dose Water Equivalence Of The Moskin Radiation Dosimeter At Clinical Kilovoltage Photon Energies, C Lian, M Othman, D Cutajar, M Butson, Susanna Guatelli, Anatoly Rosenfeld
Monte Carlo Study Of The Energy Response And Depth Dose Water Equivalence Of The Moskin Radiation Dosimeter At Clinical Kilovoltage Photon Energies, C Lian, M Othman, D Cutajar, M Butson, Susanna Guatelli, Anatoly Rosenfeld
Susanna Guatelli
Skin dose is often the quantity of interest for radiological protection, as the skin is the organ that receives maximum dose during kilovoltage X-ray irradiations. The purpose of this study was to simulate the energy response and the depth dose water equivalence of the MOSkin radiation detector (Centre for Medical Radiation Physics (CMRP), University of Wollongong, Australia), a MOSFET-based radiation sensor with a novel packaging design, at clinical kilovoltage photon energies typically used for superficial/orthovoltage therapy and X-ray CT imaging. Monte Carlo simulations by means of the Geant4 toolkit were employed to investigate the energy response of the CMRP MOSkin …
Effect Of A Magnetic Field On The Track Structure Of Low-Energy Electrons: A Monte Carlo Study, M Bug, E Gargioni, Susanna Guatelli, S Incerti, H Rabus, R Schulte, Anatoly Rosenfeld
Effect Of A Magnetic Field On The Track Structure Of Low-Energy Electrons: A Monte Carlo Study, M Bug, E Gargioni, Susanna Guatelli, S Incerti, H Rabus, R Schulte, Anatoly Rosenfeld
Susanna Guatelli
The increasing use of MRI-guided radiation therapy evokes the necessity to investigate the potential impact of a magnetic field on the biological effectiveness of therapeutic radiation beams. While it is known that a magnetic field, applied during irradiation, can improve the macroscopic absorbed dose distribution of electrons in the tumor region, effects on the microscopic distribution of energy depositions and ionizations have not yet been investigated. An effect on the number of ionizations in a DNA segment, which is related to initial DNA damage in form of complex strand breaks, could be beneficial in radiation therapy. In this work we …
From Imaging To Dosimetry: Geant4-Based Study On The Application Of Medipix To Neutron Dosimetry, M Othman, D Marinaro, M Petasecca, S Guatelli, D Cutajar, M Lerch, Dale Prokopovich, M Reinhard, J Uher, J Jakubek, S Pospisil, Anatoly Rosenfeld
From Imaging To Dosimetry: Geant4-Based Study On The Application Of Medipix To Neutron Dosimetry, M Othman, D Marinaro, M Petasecca, S Guatelli, D Cutajar, M Lerch, Dale Prokopovich, M Reinhard, J Uher, J Jakubek, S Pospisil, Anatoly Rosenfeld
Susanna Guatelli
An application of Medipix2 using a newly developed segmented multiple thickness polyethylene (PE) converter for fast neutron detection is presented. The system has the ability to provide an energy independent response for the dose equivalent for fast neutrons. The application of weighting factors to each defined thickness of PE allows for a flattening of the response of the detector system for dosimetry applications. Six PE converter segments were applied, and their thicknesses and weighting factors were optimised to obtain the required energy independent detector response. The study performed by means of GEANT4. Its suitability for neutron dosimetry was studied with …
Monte Carlo Study Of Mosfet Packaging, Optimised For Improved Energy Response: Single Mosfet Filtration, M Othman, D Cutajar, Nicholas Hardcastle, S Guatelli, Anatoly Rosenfeld
Monte Carlo Study Of Mosfet Packaging, Optimised For Improved Energy Response: Single Mosfet Filtration, M Othman, D Cutajar, Nicholas Hardcastle, S Guatelli, Anatoly Rosenfeld
Susanna Guatelli
Monte Carlo simulations of the energy response of a conventionally packaged single metal-oxide field effect transistors (MOSFET) detector were performed with the goal of improving MOSFET energy dependence for personal accident or military dosimetry. The MOSFET detector packaging was optimised. Two different ‘drop-in’ design packages for a single MOSFET detector were modelled and optimised using the GEANT4 Monte Carlo toolkit. Absorbed photon dose simulations of the MOSFET dosemeter placed in free-air response, corresponding to the absorbed doses at depths of 0.07 mm (Dw(0.07)) and 10 mm (Dw(10)) in a water equivalent phantom of size 30 x 30 x30 cm3 for …
Monte Carlo Study Of The Energy Response And Depth Dose Water Equivalence Of The Moskin Radiation Dosimeter At Clinical Kilovoltage Photon Energies, C Lian, M Othman, D Cutajar, M Butson, Susanna Guatelli, Anatoly Rosenfeld
Monte Carlo Study Of The Energy Response And Depth Dose Water Equivalence Of The Moskin Radiation Dosimeter At Clinical Kilovoltage Photon Energies, C Lian, M Othman, D Cutajar, M Butson, Susanna Guatelli, Anatoly Rosenfeld
Dean Cutajar
Skin dose is often the quantity of interest for radiological protection, as the skin is the organ that receives maximum dose during kilovoltage X-ray irradiations. The purpose of this study was to simulate the energy response and the depth dose water equivalence of the MOSkin radiation detector (Centre for Medical Radiation Physics (CMRP), University of Wollongong, Australia), a MOSFET-based radiation sensor with a novel packaging design, at clinical kilovoltage photon energies typically used for superficial/orthovoltage therapy and X-ray CT imaging. Monte Carlo simulations by means of the Geant4 toolkit were employed to investigate the energy response of the CMRP MOSkin …
Quartz Crystal Microbalance Study Of Volume Changes And Modulus Shift In Electrochemically Switched Polypyrrole, Mehrdad Bahrami-Samani, Christopher Cook, John Madden, Geoffrey Spinks, Philip Whitten
Quartz Crystal Microbalance Study Of Volume Changes And Modulus Shift In Electrochemically Switched Polypyrrole, Mehrdad Bahrami-Samani, Christopher Cook, John Madden, Geoffrey Spinks, Philip Whitten
Christopher Cook
The performance of conducting polymers as actuators is determined by a complicated series of molecular processes that occur as a result of oxidation and reduction of the polymer. In particular, the amount of actuation strain generated for a given voltage stimulus is determined by the number and type of ions (and solvent) that enter and leave the polymer and changes in the mechanical properties (particularly elastic modulus) of the polymer. In this paper, we present the effects of cyclic voltammetry on the shear modulus and volume of polypyrrole in two different electrolytes: propylene carbonate and an ionic liquid. An electrochemical …
From Imaging To Dosimetry: Geant4-Based Study On The Application Of Medipix To Neutron Dosimetry, M Othman, D Marinaro, M Petasecca, S Guatelli, D Cutajar, M Lerch, Dale Prokopovich, M Reinhard, J Uher, J Jakubek, S Pospisil, Anatoly Rosenfeld
From Imaging To Dosimetry: Geant4-Based Study On The Application Of Medipix To Neutron Dosimetry, M Othman, D Marinaro, M Petasecca, S Guatelli, D Cutajar, M Lerch, Dale Prokopovich, M Reinhard, J Uher, J Jakubek, S Pospisil, Anatoly Rosenfeld
Dean Cutajar
An application of Medipix2 using a newly developed segmented multiple thickness polyethylene (PE) converter for fast neutron detection is presented. The system has the ability to provide an energy independent response for the dose equivalent for fast neutrons. The application of weighting factors to each defined thickness of PE allows for a flattening of the response of the detector system for dosimetry applications. Six PE converter segments were applied, and their thicknesses and weighting factors were optimised to obtain the required energy independent detector response. The study performed by means of GEANT4. Its suitability for neutron dosimetry was studied with …
Monte Carlo Study Of Mosfet Packaging, Optimised For Improved Energy Response: Single Mosfet Filtration, M Othman, D Cutajar, Nicholas Hardcastle, S Guatelli, Anatoly Rosenfeld
Monte Carlo Study Of Mosfet Packaging, Optimised For Improved Energy Response: Single Mosfet Filtration, M Othman, D Cutajar, Nicholas Hardcastle, S Guatelli, Anatoly Rosenfeld
Dean Cutajar
Monte Carlo simulations of the energy response of a conventionally packaged single metal-oxide field effect transistors (MOSFET) detector were performed with the goal of improving MOSFET energy dependence for personal accident or military dosimetry. The MOSFET detector packaging was optimised. Two different ‘drop-in’ design packages for a single MOSFET detector were modelled and optimised using the GEANT4 Monte Carlo toolkit. Absorbed photon dose simulations of the MOSFET dosemeter placed in free-air response, corresponding to the absorbed doses at depths of 0.07 mm (Dw(0.07)) and 10 mm (Dw(10)) in a water equivalent phantom of size 30 x 30 x30 cm3 for …
Microbeam Radiation Therapy: A Monte Carlo Study Of The Influence Of The Source, Multislit Collimator, And Beam Divergence On Microbeams, Heidi Nettelbeck, George Takacs, Michael Lerch, Anatoly Rosenfeld
Microbeam Radiation Therapy: A Monte Carlo Study Of The Influence Of The Source, Multislit Collimator, And Beam Divergence On Microbeams, Heidi Nettelbeck, George Takacs, Michael Lerch, Anatoly Rosenfeld
George Takacs
Microbeam radiation therapy (MRT) is a new oncology method currently under development for the treatment of inoperable pediatric brain tumors. Monte Carlo simulation, or the computational study of radiation transport in matter, is often used in radiotherapy to theoretically estimate the dose required for treatment. However, its potential use in MRT dose planning systems is currently hindered by the significant discrepancies that have been observed between measured and theoretical dose and the PVDR (peak to valley dose ratio). The need to resolve these discrepancies is driven by the desirability of making MRT available to humans in the next few years. …