Physical Science International Journal https://journalpsij.com/index.php/PSIJ <p style="text-align: justify;"><strong>Physical Science International Journal (ISSN:&nbsp;2348-0130)</strong> publishes original research articles, review articles and short communications, in all areas of Physics, Chemistry and Earth Sciences. By not excluding papers based on novelty, this journal facilitates the research and wishes to publish papers as long as they are technically correct and scientifically motivated. The journal also encourages the submission of useful reports of negative results. This is a quality controlled, OPEN peer-reviewed, open-access INTERNATIONAL journal.</p> Physical Science International Journal en-US Physical Science International Journal 2348-0130 About Nature of Nuclear Forthes https://journalpsij.com/index.php/PSIJ/article/view/757 <p>After the discovery of the proton-neutron composition of nuclei, the problem of nuclear forces nature became especially urgent.<br>Nowadays, nuclear forces are explained by the action of a special strong interaction that occurs when nuclear nucleons exchange special particles - gluons.<br>This article proves that the attraction between protons and neutrons can be explained by the well-known quantum mechanical effect, which was first described about a hundred years ago. This is the attraction between two protons that occurs when they are exchanged by electron (in this case relativistic). This makes it possible, abandoning the gluon model, to obtain quantitative estimates of the magnitude of the mass defect of both light<br>and heavy nuclei.</p> Boris V. Vasiliev ##submission.copyrightStatement## 2022-12-28 2022-12-28 1 20 10.9734/psij/2022/v26i8757 A Review of Linear Fresnel Collector Receivers used in Solar Thermal Technology https://journalpsij.com/index.php/PSIJ/article/view/758 <p>Linear Fresnel collectors (LFC) have, among the four technologies of concentrating solar power (CSP), the simpler technology. They have a one axis sun tracking, plane mirrors and a fix receiver. All these elements make them the most suitable for small scales CSP plants adapted to rural area of the Sub-Saharan region. The receiver is an important part of the LFC. There is a wide variety of receivers that differ in the shape of the absorber: mono-tube, multi-tube, plane. The shape of the secondary concentrator or its absence allows to categorize the receivers in a butterfly, compound parabolic concentrator, segmented parabolic secondary concentrator or trapezoidal receiver. Vacuum mono-tube receivers have heat losses between 200&nbsp;W/m and 270&nbsp;W/m at an absorber temperature of 350°C. A mono tube receiver at partial vacuum losses more than 350&nbsp;W/m at 350°C. The lowest heat losses of a multi-tube receiver with a trapezoidal secondary concentrator can reach 500&nbsp;W/m at an absorber temperature of 350°C. This paper discusses a comparative study of existing receiver designs in order to find the most suitable for rural areas in the sub-Saharan region, i.e. easy to design by hand and low cost. Although they do not have the best thermal performance, trapezoidal receivers with a black-painted copper multi-tube absorber and a glass cover seem to be the most suitable.</p> Gaëlle Kafira Ko Aboubakar Gomna Quentin Falcoz Yezouma Coulibaly Régis Olivès ##submission.copyrightStatement## 2022-12-29 2022-12-29 21 40 10.9734/psij/2022/v26i8758