JOURNAL OF ADVANCES IN PHYSICS https://rajpub.com/index.php/jap en-US <p>The author warrants that the article is original, written by stated author(s), has not been published before, contains no unlawful statements, does not infringe the rights of others, is subject to copyright that is vested exclusively in the author and free of any third party rights, and that any necessary written permissions to quote from other sources have been obtained by the author(s).</p> editor@rajpub.com (Editorial Office) jap@rajpub.com (Gurpreet Kaur) Mon, 13 Jan 2020 00:00:00 +0000 OJS 3.1.2.4 http://blogs.law.harvard.edu/tech/rss 60 The Effects of Suction/Injection and Chemical Reaction on The Flow of Mass Transfer of A Micro Polar Fluid Past A Continuously Moving Plate in the Presence of Magnetic Field. https://rajpub.com/index.php/jap/article/view/8545 <p>An analysis is carried out to study the effects of chemical reaction and suction /injection on the flow of a micro polar fluid past a moving plate in the presence of magnetic field and mass transfer. The boundary layer equations are transformed to non-linear ordinary differential equations. Numerical results are presented for the distribution velocity, micro rotation profiles within the boundary layer. The effects of varying magnetic parameter, the non-dimensional chemical reaction parameter , Schmidt number, porosity parameter, micro rotation parameter, and coupling constant parameter are revealed.</p> Samia Sayed Shaban Copyright (c) 2020 samia sayed shaban http://creativecommons.org/licenses/by/4.0 https://rajpub.com/index.php/jap/article/view/8545 Sat, 04 Jan 2020 10:52:46 +0000 Site Specific Calibration Curve And Its Implication in The Treatment Planning of Head And Neck Cancer. https://rajpub.com/index.php/jap/article/view/8538 <p><strong>Purpose</strong>: In this study, we created&nbsp; site specific Hounsfield Unit (HU) and Relative electron density(RED) calibration curves for computed tomography(CT) and cone beam computed tomography (CBCT) for head and neck radiotherapy dose calculation and compared them with standard calibration curves.</p> <p><strong>Methods</strong>:</p> <p>The calibration curves between HU and RED were generated using RANDO phantom for CT and CBCT and fed in the treatment planning system for dose calculation for head and neck patients.The treatment plans for 10 head and neck cancer patients were calculated using the standard calibration curves generated with CATPHAN and head and neck calibration curves generated with RANDO phantom for both CT and CBCT. Dose accuracy of head and neck calibration curves(H/N CC) were compared to the standard calibration curves (SCC) using dose volume metrics and 3D gamma analysis.</p> <p><strong>Results</strong>: The results show that slightly better dosimetric agreement from the SCC can be obtained when using this H/N CC.</p> <p><strong>Conclusions</strong>: A site specific calibration curves have been proposed and tested for the head-and-neck patients and the results explain the dosimetric benefits.</p> Roopam Srivastava, Shiva Gaur, Pramod Sharma, Manoj Sharma, Jayanand Manjhi, Maria Das, Dr Deepika Chauhan, Dr Neha Sehgal Copyright (c) 2020 Roopam Srivastava, Shiva Gaur, pramod sharma, Manoj Sharma, Jayanand Manjhi, Maria Das, Dr Deepika Chauhan, Dr Neha Sehgal http://creativecommons.org/licenses/by/4.0 https://rajpub.com/index.php/jap/article/view/8538 Sat, 11 Jan 2020 00:00:00 +0000