https://rajpub.com/index.php/jap/issue/feedJOURNAL OF ADVANCES IN PHYSICS2021-03-10T06:13:39+00:00Editorial Officeeditor@rajpub.comOpen Journal Systemshttps://rajpub.com/index.php/jap/article/view/8991Nuclear Power Plants Pre-operational Radiological Monitoring Mapping for the Coastal Boarders and Islands of the United Arab Emirates (UAE)2021-03-10T06:13:39+00:00Ali S. Almeqbaliali.almeqbali@gmail.comGeorge Karaniali.almeqbali@gmail.comSayed A El-Mongyali.almeqbali@gmail.com<p>In the light of the peaceful nuclear power plants (NPPs) project of the United Arab Emirates (UAE), the operation license has been issued and the first unit is being in commercial operation. This work deals mainly with radiological surveillance of the coastal boarder and some Islands of UAE as a baseline reference natural and artificial radioactivity mapping. Ultra-sensitive hyper pure Germanium (HpGe) detector was used to carry out the non-destructive gamma measurements. The area of study was divided into; Abu Dhabi region, northern emirates and islands. About 85 soils, shore sediment and water samples were collected based on the scientific sampling mechanism. The samples were analyzed for X-ray diffraction mineralogy (XRD). The radioactivity in Bq/kg of the natural <sup>238</sup>U(<sup>226</sup>Ra), <sup>232</sup>Th and <sup>40</sup>K were calculated for all the collected samples. The artificial <sup>137</sup>Cs was also observed in very low activity. The hazard indices were also calculated and found to be less than the recommended international and regional limits. The correlations between the measured radioisotopes were also depicted. The results were compared, presented and given in 3D histograms.</p>2021-04-08T00:00:00+00:00Copyright (c) 2021 Ali S. Almeqbali, George Karani, Sayed A El-Mongyhttps://rajpub.com/index.php/jap/article/view/8982High-symmetry approximations of AX3 crystal structures retrieved with the method of hierarchical trees2021-03-03T04:58:48+00:00Panfilov A. Gsv.exciton@mail.ioffe.ruVaganov S. A.a.panfilov@mail.ioffe.ru<p>The hierarchical trees have been constructed for the AX<sub>3</sub> crystal family, significant steps of this construction being explained in detail. It has made possible to establish the archetypes of the crystal structures that are high-symmetry approximations for subfamilies of the crystals under consideration.</p>2021-03-25T00:00:00+00:00Copyright (c) 2021 Panfilov A. G, Vaganov S. A.https://rajpub.com/index.php/jap/article/view/8947Derivation of general Doppler effect equations (II) Milos Cojanovic2021-01-14T12:08:44+00:00Miloš Čojanovićmcojanovic@yahoo.com<p>In the manuscript [1] we derived the general Doppler effect equations. In order to prove the correctness of the equations, it remains to define an adequate coordinate system. We have argued that such a coordinate system cannot be chosen arbitrarily but is determined by the direction between the receiver at the time when the signal is received and the sender at the time when the signal is emitted. In this manuscript, several experiments have been<br />proposed to prove the existence of such a coordinate system. In addition, we will determine the velocities at which the sender and receiver of the signal move and the distance between them.</p>2021-02-03T00:00:00+00:00Copyright (c) 2021 Miloš Čojanovićhttps://rajpub.com/index.php/jap/article/view/8946Proposed Innovative Correlations for some Nuclear and Radiological Fields using Theorem of S. El-Mongy2021-01-12T11:07:42+00:00Sayed El-Mongysayedelmongy@hotmail.com<p>Thinking and thought are divine urge in the Great Quran. The published S. El-Mongy theorem (L= eπrs<sup>A</sup>) correlates eπ with radius r of circular and spherical geometries by a factor s<sup>A</sup> (θ/10ϕ) to be used for calculations of arc length and astronomical distance. In this article, Sayed’s formula was used to produce correlations with the well-established laws and formulas of different nuclear and radiological fields. The formula was directed to be correlated with half-life time, activity, flux, reaction rate, reactor power, mean free path, photon fluence rate, radiation dose rate and half value thickness equations. It was also oriented to calculate fuel rods circumstances of different reactor types; PWR, BWR, VVER1200 and Candu-6. The produced correlations of eπ and s<sup>A </sup>with the above mentioned topics are given with simplified reduced forms, limitation and some comparative calculations between old and the proposed innovative formulas. New formulas for sphere volume and surface area and cylinder are also given based on eπ term.</p>2021-01-25T00:00:00+00:00Copyright (c) 2021 Sayed El-Mongyhttps://rajpub.com/index.php/jap/article/view/8938Numerical Differentiation and Integration2020-12-22T08:27:38+00:00Dragan Obradovicvnm@igntu.ac.in Lakshmi Narayan Mishralakshminarayanmishra04@gmail.comVishnu Narayan Mishravishnunarayanmishra@gmail.com<p>There are several reasons why numerical differentiation and integration are used. The function that integrates <em>f (x)</em> can be known only in certain places, which is done by taking a sample. Some supercomputers and other computer applications sometimes need numerical integration for this very reason. The formula for the function to be integrated may be known, but it may be difficult or impossible to find the antiderivation that is an elementary function. One example is the function <em>f (x)</em> = exp <em>(−x<sup>2</sup>),</em> an antiderivation that cannot be written in elementary form. It is possible to find antiderivation symbolically, but it is much easier to find a numerical approximation than to calculate antiderivation (anti-derivative). This can be used if antiderivation is given as an unlimited array of products, or if the budget would require special features that are not available to computers.</p>2021-01-25T00:00:00+00:00Copyright (c) 2021 Dragan Obradovic, Lakshmi Narayan Mishra, Vishnu Narayan Mishra