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36 results for “attenuation”
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Research ArticleOpen accessEvery word in the titleRain Events Detection using Energy Variation of Commercial Microwave Links AttenuationWend Yam Serge Boris Ouedraogo, Moumouni Djibo, Ali Doumounia et al.In this study, we propose a new method for detecting wet periods by using telecommunications Commercial Microwave Links (CML). The purpose of the study is to automatically find rain time slots. The attenuation of the microwave signal, propagating between a transmitting antenna and a receiving one, due to the variations of the climatic conditions over the link, is a non-stationary … …American Journal of Applied Sciences, Vol. 19, Issue 1 · 20 Aug 2022 · 6,287 accessesView PDFCite
Research ArticleOpen accessEvery word in the titlePetroleum Hydrocarbon Pollution of Mangrove Swamps: The Promises of Remediation by Enhanced Natural AttenuationF. A. Orji, A. A. Ibiene, O. C. UgboguProblem statement: The Remediation by Enhanced Natural Attenuation (RENA) is currently being used as a cleanup technology in polluted environments in the Niger Delta and other parts of the globe. The effectiveness of RENA as a remediation technology in the most recent time has been challenged by few authorities. The deleterious effects of pollutants on the environment have led to … …American Journal of Agricultural and Biological Sciences, Vol. 7, Issue 2 · 12 May 2012 · 8,225 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleRainfall Attenuation and Rainfall Rate Measurements in Malaysia Comparison with Prediction ModelsMandeep Singh Jit Singh, Syed Idris Syed Hassan, Mohd Fadzil AinAttenuation due to rain is a primary cause of communication impairment on satellite-earth paths, especially above 10GHz. Rainfall is a serious source of attenuation at such a frequency. This paper presents the characteristics of rain distribution in USM based on measured one minute rain rate. For attenuation of rain, predictions models like ITU and VIHT (Variable Isotherm Height Technique) model … …American Journal of Applied Sciences, Vol. 4, Issue 1 · 30 Apr 2007 · 6,938 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleEarth-To-Space Improved Model for Rain Attenuation Prediction at Ku-BandMandeep Singh Jit Singh, S. S.I. Hassan, M. F. Ain et al.A model for predicting rain attenuation on earth-to-space was developed by using the measurement data obtained from tropical and equatorial region. The proposed rain attenuation model uses the complete rainfall rate cumulative distribution as input data. It was shown that significant improvements in terms of prediction error over existing attenuation model obtained. …American Journal of Applied Sciences, Vol. 3, Issue 8 · 31 Aug 2006 · 6,725 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleA SHORT INTERFERING RNA MOLECULAR BEACON FOR THE ATTENUATION OF MYCOBACTERIAL INFECTIONRemo George, Kathy Nugent, Norman Bolus et al.The ability of the pathogen Mycobacterium Tuberculosis (MTB) to invade and survive within macrophages of granulomas is attributed to the product of the Mammalian Cell Entry (MCE) operon whose gene, mce4A, encodes a cholesterol transporter that transports host lipids into the bacterium that allows the bacterium to survive during chronic infection. Here, we proposed and tested the hypothesis that a … …American Journal of Biochemistry and Biotechnology, Vol. 10, Issue 1 · 4 Mar 2014 · 7,774 accessesView PDFCite
Research ArticleOpen accessEvery word in the titleBackscattered Acoustic Energy by Monobubbles Experimental Approach and Statistical Study of the AttenuationAli Khelil, Claude ManteProblem statement: As the number of air bubbles in the sea is very high, they are so many acoustic diffusers who make illegible the recordings the purpose of which is to quantify the alive bodies. The signals backscattered by air bubbles constitute a parasite in offshore recordings and must be eliminated. It is planned to finalize techniques allowing the localization … …American Journal of Engineering and Applied Sciences, Vol. 2, Issue 2 · 30 Jun 2009 · 7,579 accessesView PDFCite
Research ArticleOpen accessIn the keywordsReduction of Radiation Effects in Biomedical Imaging Detectors by Technology ChangeEssesse Songa Auguste, Wembe Tafo Evariste, Madinatou Salomon, Belinga Aboudou JeanSilicon is a preferred material in the design of medical imaging detectors. It enables reliable and inexpensive detectors to be produced. However, the operation of this material is compromised when irradiated with high radiation of more than 5 ×1014 particles/cm2of high energy neutrons. The defects caused transform the electrical properties. Therefore, this loss of information compromises the reconstruction of important … …American Journal of Engineering and Applied Sciences, Vol. 14, Issue 3 · 17 Jul 2021 · 6,987 accessesView PDFCite
Research ArticleOpen accessIn the keywordsEffective Atomic Number of Lead Sodium Borate Glass Systems at 662 keVP. Limkitjaroenporn, W. Chewpraditkul, J. Kaewkhao, S. TuscharoenMass attenuation coefficients of glass systems xPbO: 20Na2O: (80-x)B2O3 (x = 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 and 55% mol) were determined at 662 keV photon energy using gamma rays transmission method. The theoretical values of mass attenuation coefficients were calculated by WinXCom program. These coefficients were then used to determine the effective atomic numbers of … …Energy Research Journal, Vol. 2, Issue 1 · 14 Feb 2012 · 8,300 accessesView PDFCite
Research ArticleOpen accessIn the keywordsHistorical Changes in Polychlorinated Biphenyls Contaminated SedimentsViet D. Dang, David M. Walters, Cindy M. LeeProblem statement: PCBs contamination continues to pose a health risk to aquatic environments due to their recalcitrance and bioaccumulation. The Sangamo Weston/Twelvemile Creek/Lake Hartwell Superfund Site is an example of such a health risk as a result of PCBs discharged from a former capacitor manufacturing plant. We conducted a study in twelvemile creek (Clemson, SC, USA) to examine the temporal … …American Journal of Environmental Sciences, Vol. 8, Issue 1 · 25 Jan 2012 · 7,077 accessesView PDFCite
Research ArticleOpen accessIn the keywordsThe Influences of Connectors and Adaptors to Fiber-To-The-Home Network PerformanceMohammad Syuhaimi Ab-Rahman, Mastang, Kasmiran JumariProblem statement: The reliability of the entire communications network was dependent on the reliability of each single element. Connector was important devices that can affect the performance of the fiber communication. There were a large number of issues that affect the performance of fiber optic connectors in today’s networks. These factors were increasingly as data rates, the number of wavelengths … …American Journal of Applied Sciences, Vol. 9, Issue 2 · 9 Dec 2011 · 7,183 accessesView PDFCite