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Artykuły w czasopismach na temat „Energy of 6 MV and 18 MV”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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Sharma, Anil K., Sanjay S. Supe, and K. Subbarangaiah. "Physical Characteristics Of 6 MV And 18 MV Photons From A Dual Energy Linear Accelerator." Journal of Medical Physics 18, no. 2 (1993): 1. http://dx.doi.org/10.4103/0971-6203.50095.

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Bencheikh, Mohamed, Abdelmajid Maghnouj, and Jaouad Tajmouati. "Percentage depth dose fragmentation for investigating and assessing the photon beam dosimetry quality." Journal of Radiotherapy in Practice 18, no. 03 (2018): 280–84. http://dx.doi.org/10.1017/s1460396918000687.

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AbstractAimThe purpose of this study is to introduce a new approach to assess the dosimetry quality of photon beam with energy and irradiation field size. This approach is based on percentage depth dose (PDD) fragmentation for investigating the dosimetry quality.Materials and methodsFor the investigation of the dosimetry quality of 6 and 18 MV photon beams, we have proceeded to fragment the PDD at different field sizes. This approach checks the overall PDD and is not restricted to the exponential decay regions, as per the International Atomic Energy Agency Technical Reports Series No 398 and t

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Ould, Mohamed Yeslem Ahmed El Mouna, Cheibetta Moussa Ould, Abdelmajid Choukri, Jilali Ghassoun, Oum Keltoum Hakam, and Slimane Semghouli. "Preliminary Results of Quality Control for Linear Accelerator at Oncology Center in Nouakchott." British Journal of Medicine & Medical Research 22, no. 2 (2017): 1–8. https://doi.org/10.9734/BJMMR/2017/33918.

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The National Center of Oncology in Nouakchott is equipped with a linear accelerator which provides two energies in photon regime 6 MV and 18 MV. The basic dosimetric data required for quality of operation, in the clinical routine of the accelerator for photon beams are percentage depth dose (PDD) curves and beam profile (BP) curves. The aim of this work is to measure the percentage depth dose (PDD) and beam/dose profile (BP) for 6 MV and 18 MV photon beams for different field sizes and for different Skin-Source-Distance (SSD), and to compare the measured results with the results calculated by

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Weiss, Elisabeth, Jeffrey V. Siebers, and Paul J. Keall. "An analysis of 6-MV versus 18-MV photon energy plans for intensity-modulated radiation therapy (IMRT) of lung cancer." Radiotherapy and Oncology 82, no. 1 (2007): 55–62. http://dx.doi.org/10.1016/j.radonc.2006.10.021.

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Edwards, C. R., and P. J. Mountford. "Near surface photon energy spectra outside a 6 MV field edge." Physics in Medicine and Biology 49, no. 18 (2004): N293—N301. http://dx.doi.org/10.1088/0031-9155/49/18/n01.

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Frentzel, Katharina, and Harun Badakhshi. "Irradiation with x-rays of the energy 18 MV induces radioactivity in transfusion blood: Proposal of a safe method using 6 MV." Medical Physics 43, no. 12 (2016): 6517–24. http://dx.doi.org/10.1118/1.4967482.

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Alvionita, Vinny, and Dian Milvita. "Analisis Hasil Pengukuran Tissue Maximum Ratio (TMR) terhadap Variasi Kedalaman Target dan Luas Lapangan Penyinaran Menggunakan Pesawat LINAC Tipe Clinac-CX." Jurnal Fisika Unand 7, no. 2 (2018): 97–101. http://dx.doi.org/10.25077/jfu.7.2.97-101.2018.

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Telah dilakukan penelitian untuk mengetahui pengaruh variasi kedalaman target dan luas lapangan penyinaran terhadap penerimaan dosis radiasi pada fantom menggunakan pesawat terapi Linear Accelerator (LINAC) tipe Clinac CX. Penelitian dilakukan dengan variasi kedalaman (0-30) cm dengan interval 1 cm dan 18 variasi luas lapangan penyinaran dimulai dari (5x5) cm2 hingga (39x39) cm2 dengan interval 2 cm. Variasi kedalaman dan luas lapangan dilakukan untuk mendapatkan nilai Tissue Maximum Ratio (TMR). TMR merupakan rasio dosis radiasi di kedalaman tertentu terhadap dosis radiasi di kedalaman maksim

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Tahberer, Emre, Mehmet Adigul, Ahmet Ergin Capar, Ahmet Cinkaya, Yasin Coban, and Serdar Surenkok. "Comparison of the effects of two different dose algorithms in cardiac dose parameters for hodgkin lymphoma patients receiving mediastinal radiotheraphy." Medical Science and Discovery 3, no. 8 (2016): 301–4. https://doi.org/10.36472/msd.v3i8.163.

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Objective: This study aimed to compare pencil beam (PB) and convolution superposition (CS) dose calculation algorithms with respect to cardiac dose-volume parameters V5, V25, V30 and MHD (median heart dose) in Hodgkin lymphoma (HL) patients who received mediastinal radiotherapy (RT). Material and Methods: Ten eligible cases with the diagnosis of HL who completed mediastinal RT at Dokuz Eylül University Department of Radiation Oncology before 01.01.2011 formed the study population. Related 3D conformal RT treatment plans were obtained from the Treatment Planning System (TPS) (Nucletron Oncentra

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Li, Xiao-Jun, Yan-Cheng Ye, Yan-Shan Zhang, and Jia-Ming Wu. "Empirical modeling of the percent depth dose for megavoltage photon beams." PLOS ONE 17, no. 1 (2022): e0261042. http://dx.doi.org/10.1371/journal.pone.0261042.

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Introduction This study presents an empirical method to model the high-energy photon beam percent depth dose (PDD) curve by using the home-generated buildup function and tail function (buildup-tail function) in radiation therapy. The modeling parameters n and μ of buildup-tail function can be used to characterize the Collimator Scatter Factor (Sc) either in a square field or in the different individual upper jaw and lower jaw setting separately for individual monitor unit check. Methods and materials The PDD curves for four high-energy photon beams were modeled by the buildup and tail function

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Azraai, Meor, Daisuke Miura, Yuan-Hong Lin, Thalys Sampaio Rodrigues, and Voltaire Nadurata. "Incidence and Predictors of Cardiac Implantable Electronic Devices Malfunction with Radiotherapy Treatment." Journal of Clinical Medicine 11, no. 21 (2022): 6329. http://dx.doi.org/10.3390/jcm11216329.

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Aims: To investigate the incidence of cardiac implantable electronic devices (CIED) malfunction with radiotherapy (RT) treatment and assess predictors of CIED malfunction. Methods: A 6-year retrospective analysis of patients who underwent RT with CIED identified through the radiation oncology electronic database. Clinical, RT (cumulative dose, dose per fraction, beam energy, beam energy dose, and anatomical area of RT) and CIED details (type, manufacturer, and device malfunction) were collected from electronic medical records. Results: We identified 441 patients with CIED who underwent RT. CIE

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Chow, James C. L., and Amir M. Owrangi. "Monte Carlo study on mucosal dose in oral and naval cavity using photon beams with small field." Journal of Radiotherapy in Practice 10, no. 4 (2011): 261–71. http://dx.doi.org/10.1017/s1460396910000427.

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AbstractWe study how mucosal dose in the oral or nasal cavity depends on the irradiated small segmental photon fields varying with beam energy, beam angle and mucosa thickness. Dose ratio (mucosal dose with bone underneath to dose at the same point without bone) reflecting the dose enhancement due to the bone backscatter was determined by Monte Carlo simulation (EGSnrc-based code), validated by measurements. Phase space files based on the 6 and 18 MV photon beams with small field size of 1 × 1 cm2, produced by a Varian 21 EX linear accelerator, were generated using the BEAMnrc Monte Carlo code

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Pétusseau, Arthur F., Petr Bruza, and Brian W. Pogue. "Survey of X-ray induced Cherenkov excited fluorophores with potential for human use." Journal of Radiation Research 62, no. 5 (2021): 833–40. http://dx.doi.org/10.1093/jrr/rrab055.

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Abstract X-ray induced molecular luminescence (XML) is a phenomenon that can be utilized for clinical, deep-tissue functional imaging of tailored molecular probes. In this study, a survey of common or clinically approved fluorophores was carried out for their megavoltage X-ray induced excitation and emission characteristics. We find that direct scintillation effects and Cherenkov generation are two possible ways to cause these molecules’ excitation. To distinguish the contributions of each excitation mechanism, we exploited the dependency of Cherenkov radiation yield on X-ray energy. The probe

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Gonzales Ccoscco, Alberto E., Carmen S. Guzmán-Calcina, and José L. Vega-Ramírez. "MONTE CARLO SIMULATION OF 6, 10 AND 18 MV PHOTON BEAM DOSE DISTRIBUTION IN A BRAIN TUMOR." MOMENTO, no. 67 (July 4, 2023): 22–38. http://dx.doi.org/10.15446/mo.n67.104270.

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This study aimed to obtain the absorbed dose distribution in a heterogeneous head simulator object where a brain tumor of 2 cm in diameter was located. Materials equivalent to the head and tumor were created. For head and tumor simulation, elemental composition (H, C, N, O, and others) and mass density ρ respectively were used. X-ray spectra of 6, 10 and 18 MV were used for the exposures, projecting a field of 3×3 cm2 to the tumor, with an isocentric source distance of 100 cm. Monte Carlo simulations were done with PENELOPE v.2008 code. The results show that the maximum dose to the skin is 32

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Moussous, Ouiza, Toufik Medjadj, and Saad Khoudri. "Dosimetric proprieties of FBX dosimeter for high energy photon and electron beams." Polish Journal of Medical Physics and Engineering 23, no. 3 (2017): 55–59. http://dx.doi.org/10.1515/pjmpe-2017-0010.

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Abstract The aim of this work is to characterize the ferrous sulfate-benzoic acid-xylenol orange (FBX) aqueous chemical dosimeter developed at our laboratory, prepared using ultra pure water, by measuring the absorption spectrum, dose response curve, precision and accuracy, energy and dose rate dependency and stability of response. The FBX readings were evaluated by using an accurate spectrophotometer. Experimental data were obtained using various nominal energies 6 MV, 18 MV, 12 MeV, and 15 MeV, including the 60Co γ-rays beam. The calibration of the dosimeters was performed using the ionizati

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Inal, Aysun. "Dosimetric evaluation of two phases of respiratory movement using a lung equivalent material for radiotherapy treatment planning." Journal of Radiotherapy in Practice 19, no. 2 (2019): 157–62. http://dx.doi.org/10.1017/s1460396919000505.

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AbstractBackground/aim:Radiation dosimetry requires special phantoms which are comparable with organs and tissues of a human body. The lung is one of the organs with a low density. Therefore, it is important to create and use lung equivalent phantoms in dosimetric controls. The aim of this study was to investigate the importance of using lung equivalent phantoms for different respiratory phases during measurements with both computed tomography (CT) and linear accelerator.Materials and methods:The maximum lung inhalation phantom (LIP) and lung exhalation phantom (LEP) were created for two respi

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Iqbal, Khalid, Muhammad Mazhar Iqbal, Muhammad Akram, Saima Altaf, and Saeed Ahmad Buzdar. "Dosimetric verification and quality assurance for intensity-modulated radiation therapy using Gafchromic® EBT3 film." Journal of Radiotherapy in Practice 17, no. 1 (2017): 85–95. http://dx.doi.org/10.1017/s1460396917000437.

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AbstractPurposeThis study aimed to examine the dosimetric properties of Gafchromic® EBT3 film and intensity-modulated radiation therapy quality assurance (IMRT QA).Materials and methodsBeams characteristics dosimetric properties and 20 IMRT plans were created and irradiated on Varian dual-energy DHX-S Linac for 6 and 15 MV energies. EBT3 films were analysed using ‘film Pro QA 2014’ software.ResultsThe dosimetric comparison of EBT3 film (for red channel dosimetry) and ionisation ion chamber measurement showed that average deviations of symmetry, flatness, central axis, penumbra (left) and penum

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Shamsi, Qurat-ul-ain, Saeed Ahmad Buzdar, Saima Altaf, Atia Atiq, Maria Atiq, and Khalid Iqbal. "Total scatter factor for small fields in radiotherapy: a dosimetric comparison." Journal of Radiotherapy in Practice 17, no. 3 (2017): 292–96. http://dx.doi.org/10.1017/s1460396917000681.

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AbstractPurposeSmall field dosimetry is complicated and accuracy in the measurement of total scatter factor (TSF) is crucial for dosimetric calculations, in making optimum intensity-modulated radiotherapy plans for treating small target volumes. In this study, we intended to determine the TSF measuring properties of CC01 and CC04 detectors for field sizes ranging from sub-centimetre to the centimetre fields.Material and methodsCC01 and CC04 chamber detectors were used to measure TSF for 6 and 18 MV photon beam delivered from the linear accelerator, through small fields in a water phantom. Smal

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Saminathan, Sathiyan, Henry Finlay Godson, Retna Ponmalar, Ravikumar Manickam, James Mazarello, and Rahul Fernandes. "Dosimetric Performance of Newly Developed Farmer-Type Ionization Chamber in Radiotherapy Practice." Technology in Cancer Research & Treatment 15, no. 6 (2016): NP113—NP120. http://dx.doi.org/10.1177/1533034615621635.

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Dose measurement with ionization chamber is essential to deliver accurate dose to the tumor in radiotherapy. The cylindrical Farmer-type ionization chamber is recommended by various dosimetry protocols for dose measurement of radiotherapy beams. The air-equivalent graphite wall Farmer-type ionization chamber (FAR 65 GB) of active volume 0.65 cm3 with aluminum as the central electrode material was fabricated. Various dosimetric parameters were studied for the newly developed ionization chamber in cobalt-60, 6 and 18 MV photon beams. The preirradiation and postirradiation leakage of the chamber

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Agbadan, Ignace Kodjo, Soundarzo Tasnim, Monsuru Olatunji Dauda, et al. "Durability of Membrane Electrode Assembly Components for the Electrochemical Reduction of CO₂ to C₂ Products." ECS Meeting Abstracts MA2025-01, no. 41 (2025): 2221. https://doi.org/10.1149/ma2025-01412221mtgabs.

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The durability of zero-gap membrane electrode assembly (MEA) for electrochemical conversion of CO2 relies on the stability of cell materials including electrodes, membranes and ionomers. The degradation of electrodes and the AEM membrane contributes to cell potential increase during operation. This report analyzes the energy efficiency of Cu-based electrocatalysts coupled with IrOx and NiFeOx anodes in MEA cells to convert CO2 to C2+ products. The cell potential growth of 8.4 mV h-1 for 155 h at a current density of 150 mAcm-2 in 0.1M KHCO3 for Cu nanoparticles (Cu NPs) cathode and IrOx anode,

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Shagholi, Negin, Hassan Ali, Mahdi Sadeghi, et al. "Neutron dose evaluation of Elekta Linac at two energies (10 & 18 MV) by MCNP code and comparison with experimental measurements." JOURNAL OF ADVANCES IN PHYSICS 6, no. 1 (2014): 1006–15. http://dx.doi.org/10.24297/jap.v6i1.1820.

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Medical linear accelerators, besides the clinically high energy electron and photon beams, produce other secondary particles such as neutrons which escalate the delivered dose. In this study the neutron dose at 10 and 18MV Elekta linac was obtained by using TLD600 and TLD700 as well as Monte Carlo simulation. For neutron dose assessment in 2020 cm2 field, TLDs were calibrated at first. Gamma calibration was performed with 10 and 18 MV linac and neutron calibration was done with 241Am-Be neutron source. For simulation, MCNPX code was used then calculated neutron dose equivalent was compared wit

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Da Silva Mansano, Naira, and Renata Frazao. "Kisspeptin Neurons Excitability Is Not Modulate by Fasting." Journal of the Endocrine Society 5, Supplement_1 (2021): A541—A542. http://dx.doi.org/10.1210/jendso/bvab048.1103.

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Abstract Kisspeptin is the most important neuromodulator of gonadotrophin releasing hormone neurons. Hypothalamic Kiss1-expressing neurons can be found in the anteroventral periventricular and rostral periventricular nuclei (AVPV/PeN) and in the arcuate nucleus of the hypothalamus (ARH). Food intake and energy balance are modulated by leptin, which acts primarily in the ARH. Leptin acts inhibiting orexigen neurotransmitters and stimulating anorectic neurotransmitters. Few ARH kisspeptin cells (10-15%) coexpress the leptin receptor and have their resting membrane potential (RMP) depolarized by

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Diaz De la Cruz, Germany, Shantanu Singh, Ahamed Irshad Maniyanganam, et al. "Lanthanum Transition-Metal Sulfide Electrocatalysts for Overall Water Splitting." ECS Meeting Abstracts MA2024-01, no. 34 (2024): 1748. http://dx.doi.org/10.1149/ma2024-01341748mtgabs.

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Hydrogen has been identified as a sustainable energy source for the future with the potential of replacing fossil fuels due to its high gravimetric energy density and zero carbon emissions. Water electrolysis is a promising approach to the clean production of pure hydrogen, however, the benchmark catalysts of the half reactions of water electrolysis are noble-metal based, which limit the application of this technique.1 As well, the high energy barrier and sluggish kinetics of the oxygen evolution reaction limit the efficiency of the system. Therefore, it is crucial to develop robust, stable, a

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Ding, George X. "Energy spectra, angular spread, fluence profiles and dose distributions of 6 and 18 MV photon beams: results of Monte Carlo simulations for a Varian 2100EX accelerator." Physics in Medicine and Biology 47, no. 7 (2002): 1025–46. http://dx.doi.org/10.1088/0031-9155/47/7/303.

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Zaharadniuk, A. A., A. Y. Taraev, and S. V. Lazarenko. "On the Possibility of Using Medical Linear Electron Accelerators as a Source of the Reference Pulsed Photon Radiation Field." Devices and Methods of Measurements 14, no. 3 (2023): 179–90. http://dx.doi.org/10.21122/2220-9506-2023-14-3-179-190.

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Sources of pulsed photon radiation are widely used in science and industry. In this regard, there is a growing demand for dosimetry instruments capable of operating in these pulsed photon radiation fields. Until now there is no comprehensive methodology that describes the characteristics of reference fields of pulsed photon radiation required for calibration and verification of dosimetry equipment. The aim of this paper was to study the possibility of using a medical linear electron accelerator as a generating source of a reference pulsed photon radiation field. The paper investigates main cha

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Wollmann, Guido, Claudio Acuna-Goycolea, and Anthony N. van den Pol. "Direct Excitation of Hypocretin/Orexin Cells by Extracellular ATP at P2X Receptors." Journal of Neurophysiology 94, no. 3 (2005): 2195–206. http://dx.doi.org/10.1152/jn.00035.2005.

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Hypocretin/orexin (hcrt) neurons play an important role in hypothalamic arousal and energy homeostasis. ATP may be released by neurons or glia or by pathological conditions. Here we studied the effect of extracellular ATP on hypocretin cells using whole cell patch-clamp recording in hypothalamic slices of transgenic mice expressing green fluorescent protein (GFP) exclusively in hcrt-producing cells. Local application of ATP induced a dose-dependent increase in spike frequency. In the presence of TTX, ATP (100 μM) depolarized the cells by 7.8 ± 1.2 mV. In voltage clamp under blockade of synapti

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Jung, Sokhee, and John M. Regan. "Influence of External Resistance on Electrogenesis, Methanogenesis, and Anode Prokaryotic Communities in Microbial Fuel Cells." Applied and Environmental Microbiology 77, no. 2 (2010): 564–71. http://dx.doi.org/10.1128/aem.01392-10.

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ABSTRACTThe external resistance (Rext) of microbial fuel cells (MFCs) regulates both the anode availability as an electron acceptor and the electron flux through the circuit. We evaluated the effects ofRexton MFCs using acetate or glucose. The average current densities (I) ranged from 40.5 mA/m2(9,800 Ω) to 284.5 mA/m2(150 Ω) for acetate-fed MFCs (acetate-fed reactors [ARs]), with a corresponding anode potential (Ean) range of −188 to −4 mV (versus a standard hydrogen electrode [SHE]). For glucose-fed MFCs (glucose-fed reactors [GRs]),Iranged from 40.0 mA/m2(9,800 Ω) to 273.0 mA/m2(150 Ω), wit

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Tantaoui, Meriem, Mustapha Krim, El Mehdi Essaidi, et al. "Impact of Pseudo-Random Number Generators on Dosimetric Parameters in Validation of Medical Linear Accelerator Head Simulation for 6 MV Photons Using the GATE/GEANT4 Platform." Quantum Beam Science 9, no. 2 (2025): 16. https://doi.org/10.3390/qubs9020016.

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Monte Carlo simulation relies on pseudo-random number generators. In general, the quality of these generators can have a direct impact on simulation results. The GATE toolbox, widely adopted in radiotherapy, offers three generators from which users can choose: Mersenne Twister, Ranlux-64, and James-Random. In this study, we used these generators to simulate the head of a medical linear accelerator for 6 MV photons in order to assess their potential impact on the results obtained in radiotherapy simulation. Simulations were conducted for four different field openings. The simulations included a

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Hanlon, J., B. Bednarz, and X. Xu. "SU-FF-T-48: A Study of the Impact of X-Ray Energy and Angular Distributions Produced From 6- and 18-MV Medical Linear Accelerators On Non-Target Exposures." Medical Physics 34, no. 6Part8 (2007): 2411. http://dx.doi.org/10.1118/1.2760696.

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Yadav, Vinay, Ryuki Okada, Hiroki Wago, Shigenori Mitsushima, and Yoshiyuki Kuroda. "The Effect of Intermittency of Electrolysis on the Electrochemical Deposition of Composite Self-Repairing Catalysts for Alkaline Water Electrolysis." ECS Meeting Abstracts MA2025-01, no. 62 (2025): 3025. https://doi.org/10.1149/ma2025-01623025mtgabs.

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INTRODUCTION The demand of renewable energy is increasing, yet fluctuating power supply is one of the problems. Therefore, technology for energy storage such as alkaline water electrolysis is required. When an alkaline water electrolyzers is powered by renewable energy, electrodes degrade due to reverse current generated on shutdown. We have reported self-repairing catalysts based on hybrid cobalt hydroxide nanosheets (Co-ns), and β-FeOOH nanorods (Fe-nr).[1,2] Our previous studies showed that Co-ns formed thick catalyst layer with highly conductive framework, whereas Fe-nr formed a thin layer

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Weidner, Jan, Julian Horn, Christopher Nickolas Kabat, et al. "Artificial intelligence based deconvolving on megavoltage photon beam profiles for radiotherapy applications." Physics in Medicine & Biology 67, no. 6 (2022): 06NT01. http://dx.doi.org/10.1088/1361-6560/ac594d.

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Abstract Objective. The aim of this work is an AI based approach to reduce the volume effect of ionization chambers used to measure high energy photon beams in radiotherapy. In particular for profile measurements, the air-filled volume leads to an inaccurate measurement of the penumbra. Approach. The AI-based approach presented in this study was trained with synthetic data intended to cover a wide range of realistic linear accelerator data. The synthetic data was created by randomly generating profiles and convolving them with the lateral response function of a Semiflex 3D ionization chamber.

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Roeske, John C., Luis Nuñez, Mark Hoggarth, Edwardine Labay, and Ralph R. Weichselbaum. "Characterization of the Theorectical Radiation Dose Enhancement from Nanoparticles." Technology in Cancer Research & Treatment 6, no. 5 (2007): 395–401. http://dx.doi.org/10.1177/153303460700600504.

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Recently, nanoparticles have been considered as a method of providing radiation dose enhancement in tumors. In order to quantify this affect, a dose enhancement factor (DEF) is defined that represents the ratio of the dose deposited in tumor with nanoparticles, divided by the dose deposited in the tumor without nanoparticles. Materials with atomic numbers (Z) ranging from 25 to 90 are considered in this analysis. In addition, the energy spectrum for a number of external beam x-ray sources and common radionuclides are evaluated. For a nanoparticle concentration of 5 mg/ml, the DEF is < 1.05

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Illsley, N. P., C. Glaubensklee, B. Davis, and A. S. Verkman. "Chloride transport across placental microvillous membranes measured by fluorescence." American Journal of Physiology-Cell Physiology 255, no. 6 (1988): C789—C797. http://dx.doi.org/10.1152/ajpcell.1988.255.6.c789.

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Chloride transport across human placental microvillous vesicle membrane was investigated using the fluorescent probe SPQ (6-methoxy-N[3-sulfopropyl]quinolinium). Chloride influx (JCl) was calculated from the initial rate of quenching of intravesicular SPQ fluorescence by chloride. JCl measured by SPQ fluorescence was not significantly different from JCl measured by uptake of 36Cl; SPQ did not affect measurements of JCl.JCl was increased 51% by a 58-mV membrane potential (internal positive). Voltage-stimulated JCl showed a saturable dependence on chloride concentration with a dissociation const

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Kayed, Somaya I., Dalia N. Elsheakh, Hesham A. Mohamed, and Heba A. Shawkey. "Multiband Microstrip Rectenna Using ZnO-Based Planar Schottky Diode for RF Energy Harvesting Applications." Micromachines 14, no. 5 (2023): 1006. http://dx.doi.org/10.3390/mi14051006.

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This paper presents a single-substrate microstrip rectenna for dedicated radio frequency energy harvesting applications. The proposed configuration of the rectenna circuit is composed of a clipart moon-shaped cut in order to improve the antenna impedance bandwidth. The curvature of the ground plane is modified with a simple U-shaped slot etched into it to improve the antenna bandwidth by changing the current distribution; therefore, this affects the inductance and capacitance embedded into the ground plane. The linear polarized ultra-wide bandwidth (UWB) antenna is achieved by using 50 Ω micro

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Purwanto, Widodo W., S. Slamet, Martin Rifki, et al. "Pengebangan prototipe direct methanl fuel cell (DMFC) dan pengaruh kandungan nafion membrane electrode assembly (MEA)." Jurnal Teknik Kimia Indonesia 7, no. 2 (2018): 792. http://dx.doi.org/10.5614/jtki.2008.7.2.5.

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The purposes of this research are designing the prototype of DMFC, consist of graphite and aluminium cell stacks and MEA with difference Nafion content. Cell stack has active area of 6.5 cm2, and single serpentine flow field. MEAs were fabricated using Nafion membrane 117 (DuPont), gas diffusion layer (GDL) carbon cloth, and commercial catalysts E-Tek, Pt/C for the cathode side and Pt-Ru/C for the anode. Catalysts loading on the anode are 3 and 4 mgPt-Ru/cm2 and on the cathode is 3 mg/cm2. Dry Nafion content of 20 %-wt and 40 %-wt were used in this experiment. MEA fabrication was done by brush

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Deutsch, N., T. S. Klitzner, S. T. Lamp, and J. N. Weiss. "Activation of cardiac ATP-sensitive K+ current during hypoxia: correlation with tissue ATP levels." American Journal of Physiology-Heart and Circulatory Physiology 261, no. 3 (1991): H671—H676. http://dx.doi.org/10.1152/ajpheart.1991.261.3.h671.

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Although previous work has implicated activation of ATP-sensitive K+ currents (IK,ATP) in action potential duration (APD) shortening and increased cellular K+ efflux during hypoxia, ischemia, and metabolic inhibition, no prior study has directly assessed the tissue levels of ATP at which IK,ATP activates in intact cardiac muscle. Accordingly, we correlated changes in tissue high-energy phosphate levels during substrate-free hypoxia with activation of IK,ATP in intact voltage-clamped rabbit papillary muscles. During 10 min of hypoxia, the outward K+ current measured in response to a voltage-cla

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Frederiksen, Anders Tobias, Morten Bjørn Jensen, Per Rugaard Poulsen, Niels Bassler, Brita Singers Sørensen, and Mateusz Sitarz. "Evaluation of in vitro irradiation setup: Designed for the horizontal beamline at the Danish Centre for Particle Therapy." Acta Oncologica 63 (February 13, 2024): 23–27. http://dx.doi.org/10.2340/1651-226x.2024.19657.

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Background: Radiobiological experimental setups are challenged by precise sample positioning along depth dose profile, scattering conditions, and practical difficulties that must be addressed in individual designs. The aim of this study was to produce cell survival curves with several irradiation modalities, by using a setup designed at the Danish Centre for Particle Therapy (DCPT) for in vitro proton irradiations using a horizontal beam line and thereby evaluating the setups use for in vitro irradiations experiments. Materials and methods: The setup is a water phantom suitable for in vitro re

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Wang, Tao, Jun Zhao, Qiu-Yi Li, et al. "Poria cocos-Derived Exosome-like Nanovesicles Alleviate Metabolic Dysfunction-Associated Fatty Liver Disease by Promoting Mitophagy and Inhibiting NLRP3 Inflammasome Activation." International Journal of Molecular Sciences 26, no. 5 (2025): 2253. https://doi.org/10.3390/ijms26052253.

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Metabolic dysfunction-associated fatty liver disease (MAFLD) affects approximately one-quarter of the world’s adult population, and no effective therapeutic drugs are available. Poria cocos is a fungus used as a herb and food nutrient for centuries as well as for MAFLD treatment. Exosome-like nanovesicles have many pharmacological activities; however, studies on the effects of Poria cocos-derived exosome-like nanovesicles (PCELNs) on MAFLD are lacking. Therefore, our study aimed at identifying the effects and mechanism of action of PCELNs on MAFLD. PCELNs were isolated by ultracentrifugation a

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Bujor, L., C. Oprea, M. Pop, R. Perin, and C. Vasile. "Combined focal radiotherapy (FRT) and temozolomide (TEM) in the management of high grade malignant gliomas (HGMG): Romanian single centre experience." Journal of Clinical Oncology 24, no. 18_suppl (2006): 11526. http://dx.doi.org/10.1200/jco.2006.24.18_suppl.11526.

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11526 Background: Standard treatment of HGMG is surgical resection followed by adjuvant FRT; chemotherapy is under investgation in postoperative setting combined with external FRT. The phase III study of Stupp et al favours the combined TEM and FRT for newly diagnosed HGMG with encouraging results in terms of both survival and disease free survival. We present the experience achieved in our centre with 18 consecutive patients with HGMG treated with FRT and TEM either concomitant or sequential. Methods: In the period January 2004–January 2006 eighteen consecutive adult patients age range 25–72

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Hardiyanti, Yati, Thareq Barasabha, Choirul Anam, Novitrian Novitrian, Freddy Haryanto, and Abdul Waris. "Study of Analysis the Sensitivity of the Computational Environment for Radiological Research Field Size Based on Two Dimensional Dose Distribution for Water Phantom Cases." Radiology – Open Journal 4, no. 2 (2020): 39–45. http://dx.doi.org/10.17140/roj-4-130.

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Purpose This study analysed the sensitivity of the field size from variations in the target volume dimensions, depth, and position. The variations in the target volume analysis were used to determine the width of the field size. Thus, the quality control of the radiation beam can be obtained. Materials and Methods The computed tomography (CT) image of the IBA Dose 1 type of water phantom consists of 350 slices. Variations in the dimension of the target volume were modelled in 10×10×10 cm3, 10×12×10 cm3 , 10.2×10×10.2 cm3, and 15×15×15 cm3. Beam parameters use one beam of irradiation on the cen

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Hernandez Rizo, Sara Genoveva, Erika Roxana Larios Durán, and Maximiliano Bárcena-Soto. "Thermometric Analysis of Electrochemical Systems Under Direct and Alternating Current Techniques." ECS Meeting Abstracts MA2025-01, no. 62 (2025): 3041. https://doi.org/10.1149/ma2025-01623041mtgabs.

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When electrons transfer across the electrode/electrolyte interface, a temperature variation occurs because of the heat generated in the process. This heat is the sum of the heat contributions in an electrochemical reaction, which includes the Electrochemical Peltier Heat (EPH), the overpotential heat and the Joule effect. EPH is the reversible heat effect observed at the electrode interface by the flow of an electric current [1]. From the EPH, thermodynamic state functions of electrochemical processes can be calculated. Considering the heat effects at the electrode-electrolyte interface during

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Zergeroglu, Murat A., Michael J. McKenzie, R. Andrew Shanely, Darin Van Gammeren, Keith C. DeRuisseau, and Scott K. Powers. "Mechanical ventilation-induced oxidative stress in the diaphragm." Journal of Applied Physiology 95, no. 3 (2003): 1116–24. http://dx.doi.org/10.1152/japplphysiol.00824.2002.

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Prolonged mechanical ventilation (MV) results in oxidative damage in the diaphragm; however, it is unclear whether this MV-induced oxidative injury occurs rapidly or develops slowly over time. Furthermore, it is unknown whether both soluble (cytosolic) and insoluble (myofibrillar) proteins are equally susceptible to oxidation during MV. These experiments tested two hypotheses: 1) MV-induced oxidative injury in the diaphragm occurs within the first 6 h after the initiation of MV; and 2) MV is associated with oxidative modification of both soluble and insoluble proteins. Adult Sprague-Dawley rat

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Shamsi, Qurat-ul-ain, Saeed Ahmad Buzdar, Atia Atiq, Maria Atiq, Saima Altaf, and Khalid Iqbal. "Dosimetric determination of tissue maximum ratios in small fields." Journal of Radiotherapy in Practice 17, no. 3 (2018): 289–91. http://dx.doi.org/10.1017/s1460396918000055.

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AbstractAimsThis exploration is intended to measure tissue maximum ratios (TMRs) in smaller fields through CC01 detector and to compare CC01 measured TMRs with Pinnacle treatment planning software (TPS) calculated TMRs.Materials and methodsCC01 compact chamber detector was used to measure TMR in water phantom for 6 and 18 MV beam delivered from Varian linear accelerator. Pinnacle TPS was employed in this study to calculate TMR from the measured percentage depth doses data. CC01 measured TMR data was compared with the calculated TMR data at depths from 5 to 20 cm for field sizes varying from 1

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Anokhin, I., and D. Ramazanov. "Matrix metal collimators studies for the spatially fractionated radiation therapy." COMPUTER-INTEGRATED TECHNOLOGIES: EDUCATION, SCIENCE, PRODUCTION, no. 53 (December 16, 2023): 5–8. http://dx.doi.org/10.36910/6775-2524-0560-2023-53-01.

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Traditional radiation therapy is hindered by limitations in dose delivery and the risk of over-irradiation, which can harm healthy tissues surrounding tumors. Spatially fractionated and intensity-modulated radiation therapies have emerged as promising techniques to mitigate these issues by reducing damage to healthy tissues. This study explores the potential of enhancing radiation therapy's therapeutic efficacy through spatial fractionation of X-ray beams, a technique that can significantly increase radiation efficiency by reducing the dose load on healthy tissues. This research hypothesizes t

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Daimon, Hideo, Taise Miyata, Sorataka Yoshikawa, et al. "Improvements in Oxygen Diffusivity, ORR Activity and Durability of Pt-Based Catalysts By Mesoporous Carbon Support and Melamine Decoration." ECS Meeting Abstracts MA2022-02, no. 42 (2022): 1551. http://dx.doi.org/10.1149/ma2022-02421551mtgabs.

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1. Introduction In Japan, an extremely high I-V performance is required for polymer electrolyte fuel cells (PEFCs) used in fuel cell electric vehicles after 2030 (red line in Figure 1) [1]. Therefore, we have to design Pt-based catalysts that have a high ORR activity and a durability as well as a high oxygen diffusivity [2]. In this study, the Pt-based catalysts were supported on a mesoporous carbon to increase oxygen diffusivity and the catalysts were decorated with melamine to improve ORR activity and durability [3, 4]. 2. Experimental Ketjen Black EC-300J (KB-300J: SBET: 922 m2/g, LION), Ke

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Glasgow, Glenn P., Nesrin Dogan, Anil Sethi, and Jerry Stanton. "Refined gypsum effective attenuation coefficients for Co-60, 6 MV, 10 MV and 18 MV x-rays." Physics in Medicine and Biology 48, no. 1 (2002): 63–71. http://dx.doi.org/10.1088/0031-9155/48/1/305.

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Kwon, Obeen, Florian Chabot, Carol Korzeniewski, Shannon Boettcher, Yu Morimoto, and Iryna Zenyuk. "Understanding Structure Differences of Iridium Oxides Depends on Loading in Proton Exchange Membrane Electrolyzers." ECS Meeting Abstracts MA2024-02, no. 45 (2024): 3195. https://doi.org/10.1149/ma2024-02453195mtgabs.

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Proton exchange membrane water electrolyzers (PEMWEs) have drawn attention among various hydrogen production technologies due to their zero-emission, high conversion efficiency, high hydrogen purity (>99.99%), and quick response under dynamic operation.1,2 With these auspicious characteristics in PEMWEs, they are believed to produce 40 % of green hydrogen by 2050 among all electrolyzer technologies. Nonetheless, many bottlenecks within PEMWEs still hinder their broader commercialization. Iridium oxide is the most widely used oxygen evolution reaction (OER) electrocatalyst at the anode. More

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Nemeth, S., K. Ekstrand, K. Greven, et al. "Impact of bone density corrections on dose delivered to the prostate with 4-mv 6-mv 10-mv and 18-mv photons." International Journal of Radiation Oncology*Biology*Physics 21 (January 1991): 234. http://dx.doi.org/10.1016/0360-3016(91)90649-o.

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McClung, J. M., M. A. Whidden, A. N. Kavazis, D. J. Falk, K. C. DeRuisseau, and S. K. Powers. "Redox regulation of diaphragm proteolysis during mechanical ventilation." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 294, no. 5 (2008): R1608—R1617. http://dx.doi.org/10.1152/ajpregu.00044.2008.

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Prevention of oxidative stress via antioxidants attenuates diaphragm myofiber atrophy associated with mechanical ventilation (MV). However, the specific redox-sensitive mechanisms responsible for this remain unknown. We tested the hypothesis that regulation of skeletal muscle proteolytic activity is a critical site of redox action during MV. Sprague-Dawley rats were assigned to five experimental groups: 1) control, 2) 6 h of MV, 3) 6 h of MV with infusion of the antioxidant Trolox, 4) 18 h of MV, and 5) 18 h of MV with Trolox. Trolox did not attenuate MV-induced increases in diaphragmatic leve

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Abdul Haneefa, K., K. K. Shakir, A. Siddhartha, T. Siji Cyriac, M. M. Musthafa, and R. Ganapthi Raman. "Dosimetric Studies of Mixed Energy Intensity Modulated Radiation Therapy for Prostate Cancer Treatments." Journal of Radiotherapy 2014 (March 16, 2014): 1–7. http://dx.doi.org/10.1155/2014/760206.

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Dosimetric studies of mixed field photon beam intensity modulated radiation therapy (IMRT) for prostate cancer using pencil beam (PB) and collapsed cone convolution (CCC) algorithms using Oncentra MasterPlan treatment planning system (v. 4.3) are investigated in this study. Three different plans were generated using 6 MV, 15 MV, and mixed beam (both 6 and 15 MV). Fifteen patients with two sets of plans were generated: one by using PB and the other by using CCC for the same planning parameters and constraints except the beam energy. For each patient’s plan of high energy photons, one set of pho

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Nemeth, Suzanne, Kathryn M. Greven, Kenneth E. Ekstrand, et al. "Impact of bone density corrections on target dose delivered to the prostate with 4 MV, 6 MV, 10 MV, and 18 MV photons." Medical Dosimetry 18, no. 4 (1993): 171–77. http://dx.doi.org/10.1016/0958-3947(93)90003-c.

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