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Articles de revues sur le sujet « Space radiations »

Auteur : Grafiati

Publié le 16 novembre 2024

Mis à jour le 31 juillet 2025

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1

Gillespie, Rosemary G., Gordon M. Bennett, Luc De Meester, et al. "Comparing Adaptive Radiations Across Space, Time, and Taxa." Journal of Heredity 111, no. 1 (2020): 1–20. http://dx.doi.org/10.1093/jhered/esz064.

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Abstract Adaptive radiation plays a fundamental role in our understanding of the evolutionary process. However, the concept has provoked strong and differing opinions concerning its definition and nature among researchers studying a wide diversity of systems. Here, we take a broad view of what constitutes an adaptive radiation, and seek to find commonalities among disparate examples, ranging from plants to invertebrate and vertebrate animals, and remote islands to lakes and continents, to better understand processes shared across adaptive radiations. We surveyed many groups to evaluate factors

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Shruti, Lohiya, and Laxmi Kalyani Vijay. "An Empirical Study on Electromagnetic Radiation in a Residential Complex in Ajmer City with Special Reference to the Household Electrical and Electronics Appliances." Journal of Management Engineering and Information Technology (JMEIT) 4, ` (2017): 7. https://doi.org/10.5281/zenodo.344945.

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Radiation, radiation everywhere but just a few radiations is of expend. Journey of our life from nativity to our mortality, each and every second of our life we are exaggerated by radiations whether we are in our residence or outside.Radiation is energy that is travelling through space in the form of waves or particles. The radiation energy is spreading into atmosphere and getting wasted and it is increasing atmospheric temperature too.Though there are radiations which are useful for an individual like radiations used for cancer treatment; but enhanced amount of anything is always destructive.

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Ifeoma, B. Asianuba. "Side Lobe Reduction in Linear Array Antenna using Numerical Computation Approach." European Journal of Advances in Engineering and Technology 6, no. 4 (2019): 29–35. https://doi.org/10.5281/zenodo.10687581.

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<strong>ABSTRACT</strong> Large amount of energy is saved when a transmitting antenna propagates its field radiations painstakingly in the required direction of propagation. For this reason, reduction in side lobe radiation is essential to avoid degrading the total power and efficiency of the radiating structure. In this paper, a numerical approach is adopted other than the well known stochastic approach to reduce side lobe radiations in linear array antennas. This choice is as a result of the short design cycle of the numerical solution for antenna field problems, full exploration of design s

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Liu, Dalong, Wenqin Wang, and Hua Ge. "Impact of urban densification on building energy consumption." E3S Web of Conferences 172 (2020): 16001. http://dx.doi.org/10.1051/e3sconf/202017216001.

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The close layout of buildings is an important cause of urban densification. It makes solar radiation and long-wave radiation being blocked, scattered, and reflected multiple times. Radiant heat is a key factor affecting building energy consumption. The formation mechanism of urban radiation field in the spaces surrounded by dense buildings was analysed. Calculation models were established for the intensity of short-wave and long-wave radiations in spaces surrounded by dense buildings. Characteristics of the radiation field in the enclosed space was analysed. Two typical cities were selected fo

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Bertolet, Alejandro, and Alejandro Carabe. "Modelling Dose Effects from Space Irradiations: Combination of High-LET and Low-LET Radiations with a Modified Microdosimetric Kinetic Model." Life 10, no. 9 (2020): 161. http://dx.doi.org/10.3390/life10090161.

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The Microdosimetric Kinetic Model (MKM) to predict the effects of ionizing radiation on cell colonies is studied and reformulated for the case of high-linear energy transfer (LET) radiations with a low dose. When the number of radiation events happening in a subnuclear domain follows a Poisson distribution, the MKM predicts a linear-quadratic (LQ) survival curve. We show that when few events occur, as for high-LET radiations at doses lower than the mean specific energy imparted to the nucleus, zF,n, a Poisson distribution can no longer be assumed and an initial pure linear relationship between

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Pontarp, Mikael, and Owen L. Petchey. "Ecological opportunity and predator–prey interactions: linking eco-evolutionary processes and diversification in adaptive radiations." Proceedings of the Royal Society B: Biological Sciences 285, no. 1874 (2018): 20172550. http://dx.doi.org/10.1098/rspb.2017.2550.

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Much of life's diversity has arisen through ecological opportunity and adaptive radiations, but the mechanistic underpinning of such diversification is not fully understood. Competition and predation can affect adaptive radiations, but contrasting theoretical and empirical results show that they can both promote and interrupt diversification. A mechanistic understanding of the link between microevolutionary processes and macroevolutionary patterns is thus needed, especially in trophic communities. Here, we use a trait-based eco-evolutionary model to investigate the mechanisms linking competiti

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Potvin, L., C. Rioux, and R. J. Slobodrian. "Radiations from space: Swift charged particles and neutrons." Canadian Journal of Physics 69, no. 8-9 (1991): 988–93. http://dx.doi.org/10.1139/p91-156.

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Galactic and solar cosmic radiations received on Earth are reviewed briefly together with a discussion of proposed new detection techniques. During transient periods associated with flares the Sun emits high intensities of energetic charged particles and radiations due to subatomic processes. Neutrons are also emitted as proven recently. They should provide a nondistorted picture of hadronic processes in the outer layers of the Sun when analyzed with a dedicated neutron spectrometer, which is described in detail.

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Sankarshan, Belur Mohan, Lingaraj Adarsh, Sannathammegowda Krishnaveni, Nagarajan Sowmya, Kulkarni Shrinivasrao, and Holaly Chandrashekara Shastry Manjunatha. "An investigation on polymers for shielding of cosmic radiation for lunar exploration." Radiation Protection Dosimetry 199, no. 20 (2023): 2469–74. http://dx.doi.org/10.1093/rpd/ncad248.

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Abstract In outer space, we find many types of radiations that are due to solar flares, radiation belt, cosmic rays, etc. We are fortunate enough to be protected from these radiations on the surface of the Earth, whereas in other celestial objects such as planets and satellites, without a protecting atmosphere, penetration of radiation that may be ionising or non-ionising is inevitable. Hence, studying radiation environment and its effect on such celestial objects is very important for establishing facilities such as satellites, payloads, vehicles and human exploration. For such cases, manufac

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Cucinotta, F. A., J. W. Wilson, J. L. Shinn, F. F. Badavi, and G. D. Badhwar. "Effects of target fragmentation on evaluation of LET spectra from space radiations: Implications for space radiation protection studies." Radiation Measurements 26, no. 6 (1996): 923–34. http://dx.doi.org/10.1016/s1350-4487(96)00070-4.

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Muhammad, Ashraf. "A Comprehensive Review of the Impact of Thermal Radiations on Energy Exchange Systems." Nucleus 60, no. 1 (2023): 108–11. https://doi.org/10.71330/nucleus.60.01.1302.

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Radiations or electromagnetic rays have a significant role in energy emission from nuclear explosions as well as energy transmission in furnaces and combustion chambers. The radiations are considered in computing thermal influence in devices such as a rocket nozzle, nuclear power plants for space applications, or a gaseous-core nuclear rocket. Energy is transferred between separated elements without a medium in case of radiations or electromagnetic rays. The structure, surface quality, temperature and wavelength of the rotation angle at which radiation is emitted or absorbed by the surface and

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Liu, Dalong, Xiaowei Jia, and Wenqin Wang. "Comparative analysis of simulation of urban radiation field." MATEC Web of Conferences 282 (2019): 02026. http://dx.doi.org/10.1051/matecconf/201928202026.

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In order to compare the differences between various outdoor environmental simulation software in the urban radiation field, ENVI-met, RayMan and SOLWEIG were selected as the research objects. The multiple types of urban radiation intensities that can be obtained by each software are compared, and the calculation method of types of these radiations was analyzed. Effects of underlying surface on the radiation field were simulated separately. The differences in radiation field performance simulations of three softwares were compared from several aspects such as short wave, direct radiation and re

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Van Bocxlaer, Bert. "Hierarchical structure of ecological and non-ecological processes of differentiation shaped ongoing gastropod radiation in the Malawi Basin." Proceedings of the Royal Society B: Biological Sciences 284, no. 1862 (2017): 20171494. http://dx.doi.org/10.1098/rspb.2017.1494.

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Ecological processes, non-ecological processes or a combination of both may cause reproductive isolation and speciation, but their specific roles and potentially complex interactions in evolutionary radiations remain poorly understood, which defines a central knowledge gap at the interface of microevolution and macroevolution. Here I examine genome scans in combination with phenotypic and environmental data to disentangle how ecological and non-ecological processes contributed to population differentiation and speciation in an ongoing radiation of Lanistes gastropods from the Malawi Basin. I f

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Albi, Elisabetta, Samuela Cataldi, Maristella Villani, and Giuseppina Perrella. "Nuclear Phosphatidylcholine and Sphingomyelin Metabolism of Thyroid Cells Changes during Stratospheric Balloon Flight." Journal of Biomedicine and Biotechnology 2009 (2009): 1–5. http://dx.doi.org/10.1155/2009/125412.

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Nuclear sphingomyelin and phosphatidylcholine metabolism is involved in the response to ultraviolet radiation treatment in different ways related to the physiological state of cells. To evaluate the effects of low levels of radiation from the stratosphere on thyroid cells, proliferating and quiescent FRTL-5 cells were flown in a stratospheric balloon (BIRBA mission). After recovery, the activity of neutral sphingomyelinase, phosphatidylcholine-specific phospholipase C, sphingomyelin synthase, and reverse sphingomyelin synthase was assayed in purified nuclei and the nuclei-free fraction. In pro

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Abdullah, Hasnain, Asmalia Zanal, Mohamad Hakim Ahya Ilmudin, et al. "Characteristic Evaluation of Multiple Layers Microwave Absorber Coated with Biomass Composite." Applied Mechanics and Materials 850 (August 2016): 88–92. http://dx.doi.org/10.4028/www.scientific.net/amm.850.88.

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Radiation Absorbing Material (RAM) is used to absorb radiations of electromagnetic wave surrounding us. Thus, the multiple layers’ microwave absorber using biomass composite materials could be one of the solutions to address the problem. In order to effectively absorb the radiation of electromagnetic wave, the multiple layers’ absorber is characterized to optimize the performance of the absorber. The characterization is made by varying biomass composite material contents, thickness and other possible considerations. CST Microwave Studio software is first used to design and simulate the multipl

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ZHANG, BAOCHENG, QING-YU CAI, MING-SHENG ZHAN, and LI YOU. "INFORMATION CONSERVATION IS FUNDAMENTAL: RECOVERING THE LOST INFORMATION IN HAWKING RADIATION." International Journal of Modern Physics D 22, no. 12 (2013): 1341014. http://dx.doi.org/10.1142/s0218271813410149.

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In both classical and quantum world, information cannot appear or disappear. This fundamental principle, however, is questioned for a black hole, by the acclaimed "information loss paradox." Based on the conservation laws of energy, charge, and angular momentum, we recently show the total information encoded in the correlations among Hawking radiations equals exactly to the same amount previously considered lost, assuming the nonthermal spectrum of Parikh and Wilczek. Thus the information loss paradox can be falsified through experiments by detecting correlations, for instance, through measuri

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Blakely, Eleanor A. "The 20th Gray lecture 2019: health and heavy ions." British Journal of Radiology 93, no. 1115 (2020): 20200172. http://dx.doi.org/10.1259/bjr.20200172.

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Objective Particle radiobiology has contributed new understanding of radiation safety and underlying mechanisms of action to radiation oncology for the treatment of cancer, and to planning of radiation protection for space travel. This manuscript will highlight the significance of precise physical and biologically effective dosimetry to this translational research for the benefit of human health. This review provides a brief snapshot of the evolving scientific basis for, and the complex current global status, and remaining challenges of hadron therapy for the treatment of cancer. The need for

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Mitrikas, V. G. "SOME ASPECTS OF THE RADIATION EXPOSURE OF COSMONAUTS TRAVERSING THE EARTH'S MAGNETOSPHERE." Aerospace and Environmental Medicine 55, no. 3 (2021): 51–56. http://dx.doi.org/10.21687/0233-528x-2021-55-3-51-56.

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Dose loading of cosmonaut's representative body organs beyond the Earth's magnetosphere was calculated for various scenarios of departure from a reference orbit in space vehicles of different design. Calculation of contribution to the equivalent doses from protons and electrons of Earth's radiations belts and galactic cosmic rays (GCR) demonstrated that, irrespective of vehicle design, during solar minimum and growing activity the equivalent dose does not exceed the established limit for a single exposure to 150 mSv. However, radiation exposure may vary in times depending on the traverse traje

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Suzuki, Masao, Yukio Uchihori, Hisashi Kitamura, Masakazu Oikawa, and Teruaki Konishi. "Biologic Impact of Different Ultra-Low-Fluence Irradiations in Human Fibroblasts." Life 10, no. 8 (2020): 154. http://dx.doi.org/10.3390/life10080154.

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In this study, we aimed to evaluate the cellular response of healthy human fibroblasts induced by different types of ultra-low-fluence radiations, including gamma rays, neutrons and high linear energy transfer (LET) heavy ions. NB1RGB cells were pretreated with ultra-low-fluence radiations (~0.1 cGy/7–8 h) of 137Cs gamma rays, 241Am–Be neutrons, helium, carbon and iron ions before being exposed to an X-ray-challenging dose (1.5 Gy). Helium (LET = 2.3 keV/µm), carbon (LET = 13.3 keV/µm) and iron (LET = 200 keV/µm) ions were generated with the Heavy Ion Medical Accelerator in Chiba (HIMAC), Japa

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Cheong, Patrick Chi-Kit, Harry Ho-Yin Ng, Alan Tsz-Lok Lam, and Tjonnie Guang Feng Li. "General-relativistic Radiation Transport Scheme in Gmunu. I. Implementation of Two-moment-based Multifrequency Radiative Transfer and Code Tests." Astrophysical Journal Supplement Series 267, no. 2 (2023): 38. http://dx.doi.org/10.3847/1538-4365/acd931.

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Abstract We present the implementation of a two-moment-based general-relativistic multigroup radiation transport module in the General-relativistic multigrid numerical (Gmunu) code. On top of solving the general-relativistic magnetohydrodynamics and the Einstein equations with conformally flat approximations, the code solves the evolution equations of the zeroth- and first-order moments of the radiations in the Eulerian-frame. An analytic closure relation is used to obtain the higher order moments and close the system. The finite-volume discretization has been adopted for the radiation moments

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Ing, H., T. McLean, R. Noulty, and A. Mortimer. "Bubble Detectors and the Assessment of Biological Risk from Space Radiations." Radiation Protection Dosimetry 65, no. 1 (1996): 421–24. http://dx.doi.org/10.1093/oxfordjournals.rpd.a031677.

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Belyaev, B. I., Yu V. Belyaev, V. V. Veller, L. V. Katkovskii, É. I. Nesterovich, and V. A. Sosenko. "Space Videophotometric System for Recording Optical Radiations in the Earth Atmosphere." Journal of Applied Spectroscopy 70, no. 5 (2003): 770–81. http://dx.doi.org/10.1023/b:japs.0000008877.53018.df.

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Frederickson, A. R., E. G. Holeman, and E. G. Mullen. "Characteristics of spontaneous electrical discharging of various insulators in space radiations." IEEE Transactions on Nuclear Science 39, no. 6 (1992): 1773–82. http://dx.doi.org/10.1109/23.211366.

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Petrov, V. M. "Overview on experience to date on human exposure to space radiations." Advances in Space Research 14, no. 10 (1994): 397–408. http://dx.doi.org/10.1016/0273-1177(94)90493-6.

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Takahashi, Akihisa, Xiaoming Su, Hiromi Suzuki, et al. "p53-Dependent Adaptive Responses in Human Cells Exposed to Space Radiations." International Journal of Radiation Oncology*Biology*Physics 78, no. 4 (2010): 1171–76. http://dx.doi.org/10.1016/j.ijrobp.2010.04.062.

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Ursu, Ioan, Daniela Enciu, and Adrian Toader. "Towards structural health monitoring of space vehicles." Aircraft Engineering and Aerospace Technology 89, no. 6 (2017): 920–27. http://dx.doi.org/10.1108/aeat-07-2015-0173.

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Purpose The purpose of this paper is to report the results of a recent project of complex tests on the survival of structural health monitoring (SHM) technology with piezo wafer active sensors (PWAS) and electromechanical impedance spectroscopy (EMIS) at simulating the concomitant action of harsh conditions of outer space: extreme temperatures, radiations, vacuum. Design/methodology/approach The tests were conducted on PWAS, consists in adhesive and aluminium discs as structural specimens, with PWAS bonded on them. The substantiating of PWAS-EMIS-based SHM technique consists the fact that real

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Bogatyrev, Yu V., D. A. Aharodnikau, S. B. Lastovsky, et al. "Influence of ionizing radiation on the parameters of p-channel MOS transistors." Proceedings of the National Academy of Sciences of Belarus, Physical-Technical Series 67, no. 4 (2023): 402–8. http://dx.doi.org/10.29235/1561-8358-2022-67-4-402-408.

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The results of experimental studies of the influence of gamma radiation Co60 on the basic parameters of silicon epitaxial-planar p-channel MOSFET transistors under different electrical modes are presented. Transistors were manufactured according to radiation-resistant DMOS technology with design standards of 1.4 μm. As a result of transistor studies, it was established that the values of all basic parameters after the radiation dose D = 106 rads (SiO2) in active electrical irradiation modes remained within the limits of the performance criteria; the parameter, most sensitive to influence of a

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Doikov, D. N., E. M. Doikova, and M. Jerdev. "THE EXISTENCE OF SIMPLEST BIOLOGICAL STRUCTURES IN THE FIELD OF HARD RADIATIONS." Odessa Astronomical Publications 37 (November 27, 2024): 103–6. https://doi.org/10.18524/1810-4215.2024.37.312685.

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The paper deals with the application of biophysics in astrobiology and space medicine. The interaction between cells, bacteria, and hard radiation in near-Earth space is calculated. We studied role of photons on the destruction of elementary biological structures. Depending of the spectra and intensity of X-rays and soft γ-radiation we declared, that calculations of photon energy deposition has been practical interest from the point of view of space flight safety and the survival of various forms in space. It was found how radiation energy transfer processes in cells and bacteria, changes thei

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Yi, Soyeon, Soyeon Kim, and Jeeyeon Song. "Analysis of the Effect of Space Radiations on the Nematode, <i> Caenorhabditis elegans </i>, through the Simulated Space Radiation." International Journal of Astronomy and Astrophysics 03, no. 03 (2013): 291–302. http://dx.doi.org/10.4236/ijaa.2013.33035.

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Lorion, Julien, Steffen Kiel, Baptiste Faure, et al. "Adaptive radiation of chemosymbiotic deep-sea mussels." Proceedings of the Royal Society B: Biological Sciences 280, no. 1770 (2013): 20131243. http://dx.doi.org/10.1098/rspb.2013.1243.

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Adaptive radiations present fascinating opportunities for studying the evolutionary process. Most cases come from isolated lakes or islands, where unoccupied ecological space is filled through novel adaptations. Here, we describe an unusual example of an adaptive radiation: symbiotic mussels that colonized island-like chemosynthetic environments such as hydrothermal vents, cold seeps and sunken organic substrates on the vast deep-sea floor. Our time-calibrated molecular phylogeny suggests that the group originated and acquired sulfur-oxidizing symbionts in the Late Cretaceous, possibly while i

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HSU, JONG-PING. "YANG–MILLS GRAVITY IN FLAT SPACE–TIME II: GRAVITATIONAL RADIATIONS AND LEE–YANG FORCE FOR ACCELERATED COSMIC EXPANSION." International Journal of Modern Physics A 24, no. 28n29 (2009): 5217–33. http://dx.doi.org/10.1142/s0217751x0904765x.

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Within Yang–Mills gravity with translation group T(4) in flat space–time, the invariant action involving quadratic translation gauge-curvature leads to quadrupole radiations, which are shown to be consistent with experiments. The radiation power turns out to be the same as that in Einstein's gravity to the second-order approximation. We also discuss an interesting physical reason for the accelerated cosmic expansion based on the long-range Lee–Yang force of Ub(1) gauge field associated with the established conservation law of baryon number. We show that the Lee–Yang force can be related to a l

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Hossain, M. Ilias. "Hawking Non-thermal and Purely Thermal Radiations of Rotating Black Hole in Anti-de Sitter Space Time by Hamilton-Jacobi Method." GANIT: Journal of Bangladesh Mathematical Society 37 (February 20, 2018): 99–109. http://dx.doi.org/10.3329/ganit.v37i0.35729.

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We have explored Hawking non-thermal and purely thermal radiations of Kerr-anti-de Sitter (KAdS) black hole using massive particles tunneling method by taking into account the space time background as dynamical, energy and angular momentum as conserved incorporating the selfgravitation effect of the emitted particles. The results we have obtained for KAdS black hole have shown that the tunneling rates are related to the change of Bekenstein-Hawking entropy and the derived emission spectrum deviates from the pure thermal spectrum and also the obtaining results for KAdS black hole are accordant

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INCERTI, S., G. BALDACCHINO, M. BERNAL, et al. "THE GEANT4-DNA PROJECT." International Journal of Modeling, Simulation, and Scientific Computing 01, no. 02 (2010): 157–78. http://dx.doi.org/10.1142/s1793962310000122.

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The Geant4-DNA project proposes to develop an open-source simulation software based and fully included in the general-purpose Geant4 Monte-Carlo simulation toolkit. The main objective of this software is to simulate biological damages induced by ionizing radiations at the cellular and sub-cellular scale. This project was originally initiated by the European Space Agency for the prediction of the deleterious effects of radiations that may affect astronauts during future long duration space exploration missions. In this paper, the Geant4-DNA collaboration presents an overview of the whole on-goi

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OO, Myo, Nahrul Rashid, Julia Karim, et al. "Electrical characterization of commercial NPN bipolar junction transistors under neutron and gamma irradiation." Nuclear Technology and Radiation Protection 29, no. 1 (2014): 46–52. http://dx.doi.org/10.2298/ntrp1401046o.

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Electronics components such as bipolar junction transistors, diodes, etc. which are used in deep space mission are required to be tolerant to extensive exposure to energetic neutrons and ionizing radiation. This paper examines neutron radiation with pneumatic transfer system of TRIGA Mark-II reactor at the Malaysian Nuclear Agency. The effects of the gamma radiation from Co-60 on silicon NPN bipolar junction transistors is also be examined. Analyses on irradiated transistors were performed in terms of the electrical characteristics such as current gain, collector current and base current. Expe

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Skipwith, Phillip L., and Paul M. Oliver. "Ecologically diverse island-associated lizard radiation shows idiosyncratic trait diversification shifts and homogenous speciation dynamics." Evolution 77, no. 1 (2022): 138–54. http://dx.doi.org/10.1093/evolut/qpac002.

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Abstract A key area of interest in evolutionary biology has been understanding the role of ecological opportunity in the formation of adaptive radiations, lineages where speciation and phenotypic diversification are driven by open ecological opportunity. Evolutionary theory posits that adaptive radiations should show initial bursts of ecomorphological diversification and rapid speciation, and that these two processes are correlated. Here, we investigate and contrast these predictions across ecomorphologically diverse continental (Australia) and insular (New Caledonia and New Zealand) radiation

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Held, Kathryn D. "Effects of low fluences of radiations found in space on cellular systems." International Journal of Radiation Biology 85, no. 5 (2009): 379–90. http://dx.doi.org/10.1080/09553000902838558.

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Capolupo, Antonio. "Dark Matter and Dark Energy Induced by Condensates." Advances in High Energy Physics 2016 (2016): 1–10. http://dx.doi.org/10.1155/2016/8089142.

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It is shown that the vacuum condensate induced by many phenomena behaves as a perfect fluid which, under particular conditions, has zero or negative pressure. In particular, the condensates of thermal states of fields in curved space and of mixed particles have been analyzed. It is shown that the thermal states with the cosmic microwave radiation temperature and the Unruh and the Hawking radiations give negligible contributions to the critical energy density of the universe, while the thermal vacuum of the intercluster medium could contribute to the dark matter, together with the vacuum energy

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Abdul Amir, Haider F., and Fuei Pien Chee. "Evaluation on Diffusion of Bipolar Junction Transistor (BJT) Charge-Carrier and its Dependency on Total Dose Irradiation." Advanced Materials Research 701 (May 2013): 71–76. http://dx.doi.org/10.4028/www.scientific.net/amr.701.71.

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Electronic device that subjected to various effects by radiations can cause small interferences such as noises in the circuit. These effects are especially critical in operating environment such as outer space, where radiation comes in stronger and more frequent. In this research, analytical study on the effects of ionizing radiation induced by 60Co gamma (γ) rays in bipolar junction transistor (BJT) devices had been performed. It was found that the high energy of the radiation allows more valence electrons to be excited to the conduction band in the BJT. This leads to the production of a larg

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Volk, Kevin, and Sun Kwok. "A self-consistent photoionization-dust continuum-molecular line transfer model of NGC7027." Symposium - International Astronomical Union 180 (1997): 285. http://dx.doi.org/10.1017/s007418090013102x.

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A model to simulate the entire spectrum (1000 Å to 1 cm) of the high-excitation young planetary nebula NGC 7027 is presented. The ionized, dust, and molecular components of the object are modeled using geometric parameters obtained from visible, radio, infrared, and CO data. The physical processes considered include recombination lines of H and He, collisional excited lines of metals, bf and ff continuum radiations, two-photon radiation, dust continuum radiation, and molecular rotational and vibrational transitions. The dust component is assumed to be heated by a combination of direct starligh

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Nayak, Jagannath, and Deepak Kumar. "A Review on Thermophotovoltaic Energy Conversions and its Space Power Applications." Journal of Physics: Conference Series 2603, no. 1 (2023): 012011. http://dx.doi.org/10.1088/1742-6596/2603/1/012011.

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Abstract Thermophotovoltaic (TPV) system coverts heat radiations from various sources like Thermophotovoltaic (TPV) system coverts heat radiations from various sources like combustion of fuels, industrial waste heat and nuclear energy into electricity. To fulfil the demand of energy TPV is an alternate, can enable approaches to energy storage and conversion. The TPV model consists of multiple arrays of TPV cells, an emitter, a radiator and a filter. one of the important advantages of TPVs are the high efficiencies and direct conversion of DC power. This paper presents the research being conduc

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Nawaz, Faisal, Bulbul Jan, Faisal Ahmed Khan Afridi, M. Ayub Khan Yousufzai, and Faraz Mehmood. "Comparative Study of the Dynamics of Cosmic Rays for the Pakistan and China Atmospheric Regions." Journal of Mathematical and Fundamental Sciences 52, no. 3 (2020): 261–75. http://dx.doi.org/10.5614/j.math.fund.sci.2020.52.3.1.

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This paper presents an analysis of cosmic ray intensity in Pakistan air space using spatial interpolation, comparing it with Chinese cosmic ray records from 1984 to 1993. The Exploratory Data Analytic (EDA) approach was applied to compare the cosmic ray fluctuations in both countries. The time series plot of the monthly cosmic rays showed relatively flatter counts in Pakistan than in China. The cosmic ray data for the years 1984 to 1993 fell within Solar Cycle 22, which lasted from 1986 to 1996, with its maximum phase in 1989 to 1991. The cosmic radiation varies between the atmospheric regions

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Singhal, Umang, and Yash Pal. "Propellant-Less Thrust Generation - A Review." Applied Mechanics and Materials 852 (September 2016): 639–45. http://dx.doi.org/10.4028/www.scientific.net/amm.852.639.

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This paper introduces a concept of propellant-less microwave thruster for upper stage and space applications. The propellant-less microwave thruster works on classical electromagnetic theory, where the microwave radiations are converted to the electromagnetic pressure that acts as axial thrust. In microwave thrusters, microwaves are radiated to a sealed conical cavity which follows the contour of the thrusters to produce pressure. Normally, there are three types of methods by which thrust can be produced without utilizing any propellant. Cannae Drive, EmDrive, and the Wrap Drive are mostly use

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Mohanty, Asutosh, Bikash Ranjan Behera, Karu P. Esselle, Mohammed H. Alsharif, Abu Jahid, and Syed Agha Hassnain Mohsan. "Investigation of a Dual-Layer Metasurface-Inspired Fractal Antenna with Dual-Polarized/-Modes for 4G/5G Applications." Electronics 11, no. 15 (2022): 2371. http://dx.doi.org/10.3390/electronics11152371.

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In this research article, a dual-polarized compact bow-tie-shaped irregular fractal antenna with a dual metasurface (DMS) for directional radiation applications is designed using a dual-mode simple feeding mechanism. A short-circuited strip linked between the impedance transformation feed and the radiating patch activates the induced coupling modes, which are capacitive (C-mode) and inductive (L-mode), respectively. The C-mode antenna operates at 2.39–2.53 GHz, whereas the L-mode antenna operates at 2.88–4.49 GHz. It comprises a DMS positioned at 0.22λ∘ from the antenna with 0.016λ∘ separation

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Mordachev, V. I. "Characteristics of the electromagnetic environment created by radiations of user equipment of ...4G/5G/6G cellular (mobile) communications in buildings." Doklady BGUIR 19, no. 6 (2021): 42–50. http://dx.doi.org/10.35596/1729-7648-2021-19-6-42-50.

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The goal of the work is to substantiate the technique for assessing the intensity of electromagnetic background generated by the set of radiating user devices of mobile communications in multi-storey buildings. For known empirical models of radio wave propagation in buildings, expressions are obtained for the probability distribution density and expectation of the power flux density of electromagnetic fields generated inside building by these sources from various parts of the building's interior space: from the near zone with radio wave propagation conditions similar to free space; and from th

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Kumar, Gulshan, and Mohinder Kumar. "Depletion of ozone layer: Review in reference to galactic radiations." Environment Conservation Journal 26, no. 1 (2025): 249–56. https://doi.org/10.36953/ecj.29342926.

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This review work represented the effect of various galactic activities, including solar cycles and some key elements of environmental pollution, in the variation of the total ozone column of the earth’s atmosphere. The various old and new works by various researchers worldwide, including the data spared by various international agencies, are reviewed; the research design is based on the fact that measurable dissociation rates have been reported by various researchers due to the interaction of highly energetic charged contents of the galactic radiations with ozone with the fact that a wavelengt

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Boudjada, Mohammed Y., Patrick H. M. Galopeau, Sami Sawas, et al. "Low-altitude frequency-banded equatorial emissions observed below the electron cyclotron frequency." Annales Geophysicae 38, no. 3 (2020): 765–74. http://dx.doi.org/10.5194/angeo-38-765-2020.

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Abstract. The ICE (Instrument Champ Électrique) experiment on board the DEMETER (Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions) satellite recorded frequency-banded wave emissions below the electron cyclotron frequency, with band spacing ≳ frequency low-hybrid resonance, in the vicinity of the magnetic equatorial plane. Those radiations were observed in the beginning of the year 2010 on the night side of Earth and rarely on the day side. We distinguish two components: one appears as frequency bands continuous in time between a few kilohertz and up to 50 kHz, and th

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Curtis, S. B. "Possible effects of protracted exposure on the additivity of risks from space radiations." Advances in Space Research 18, no. 1-2 (1996): 41–44. http://dx.doi.org/10.1016/0273-1177(95)00787-f.

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Amir, Haider F. Abdul, та Fuei Pien Chee. "Monte Carlo Simulation of Alpha (α) Particles Penetration in Nanoscale Silicon Semiconductor Materials". Advanced Materials Research 528 (червень 2012): 237–40. http://dx.doi.org/10.4028/www.scientific.net/amr.528.237.

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Microsystems, both in space and ground level, will use systems with III-V semiconductors and devices of nanoscale. Vulnerability of this system towards the radiations warrants extra care to be taken. Therefore, appropriate test and analysis to assure the hardness (radiation resistance) of components to be used in various radiation environments is necessary. In this paper, the defect generated in the interaction of alpha (α) particles and silicon (Si) semiconductor material is simulated using SRIM (Stopping and Range of Ions in Matter). The induced defects are in the form of vacancies, defect c

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Rubin, Ilan N., Iaroslav Ispolatov, and Michael Doebeli. "Evolution to alternative levels of stable diversity leaves areas of niche space unexplored." PLOS Computational Biology 17, no. 7 (2021): e1008650. http://dx.doi.org/10.1371/journal.pcbi.1008650.

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One of the oldest and most persistent questions in ecology and evolution is whether natural communities tend to evolve toward saturation and maximal diversity. Robert MacArthur’s classical theory of niche packing and the theory of adaptive radiations both imply that populations will diversify and fully partition any available niche space. However, the saturation of natural populations is still very much an open area of debate and investigation. Additionally, recent evolutionary theory suggests the existence of alternative evolutionary stable states (ESSs), which implies that some stable commun

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HSU, JONG-PING. "YANG–MILLS GRAVITY IN FLAT SPACE–TIME I: CLASSICAL GRAVITY WITH TRANSLATION GAUGE SYMMETRY." International Journal of Modern Physics A 21, no. 25 (2006): 5119–39. http://dx.doi.org/10.1142/s0217751x06034082.

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We formulate and explore the physical implications of a new translation gauge theory of gravity in flat space–time with a new Yang–Mills action, which involves quadratic gauge curvature and fermions. The theory shows that the presence of an "effective Riemann metric tensor" for the motions of classical particles and light rays is probably the manifestation of the translation gauge symmetry in flat physical space–time. In the post-Newtonian approximation of the tensor gauge field produced by the energy–momentum tensor, the results are shown to be consistent with classical tests of gravity and w

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Kwon, You Jin, and Dong Kun Lee. "Thermal Comfort and Longwave Radiation over Time in Urban Residential Complexes." Sustainability 11, no. 8 (2019): 2251. http://dx.doi.org/10.3390/su11082251.

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Large cities with a high concentration of high-rise buildings are shaded by urban canyon. This brings a cooling effect compared to the space exposed to the sun, but is not always cool due to the longwave radiation emitted from buildings and the built environment. We tested the micro-scale effects of major external spatial factors, trees, and buildings, under shade on longwave radiation shifts to understand the effects of large shaded areas in megacities. Incoming and outgoing longwave radiations (ILR and OLR, respectively) were found to decrease the overall observation by time zone. Longwave r

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