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304 results for “ROC”
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Research ArticleOpen accessIn the abstractABOUT THE DETONATION ENGINEBulat Pavel ViktorovichThe research objects of this study are new principles of gas turbine and rocket engines working process organization, based on the oscillatory motion of shock and detonation waves. Purpose is to identify the state of level technology, describe the subject area, state the direction of research and formulate the main problems hindering the implementation of wave technology into mass production. … …American Journal of Applied Sciences, Vol. 11, Issue 8 · 28 May 2014 · 7,563 accessesView PDFCite
Research ArticleOpen accessIn the abstractMANGANESE SPECIATION IN SELECTED AGRICULTURAL SOILS OF PENINSULAR MALAYSIAJ. Habibah, J. Khairiah, B.S. Ismail, M.D. KadderiManganese speciation in selected agricultural soils of Peninsular Malaysia is discussed in this study. Manganese concentration in the Easily Leacheable and Ion Exchangeable (ELFE), Acid Reducible (AR), Organic Oxidizable (OO) and Resistant (RR) fractions of soils developed on weathered rocks, soils of mixed nature, alluvium and peat deposits are described. The total manganese concentration in soils developed on weathered rocks … …American Journal of Environmental Sciences, Vol. 10, Issue 2 · 7 Apr 2014 · 7,493 accessesView PDFCite
Research ArticleOpen accessIn the abstractHYPOLITHIC CYANOBACTERIA COLONIZATION OF QUARTZ AT SOUTH DESERTRoda F. Al-ThaniHypolithic microbial communities (found underneath rocks) were encountered in the southern desert of Qatar where quartz rocks are ubiquitous and are a substrate for hypoliths. These hypoliths thrive where extreme temperature, moisture stress and high light intensity limit the occurrence of higher plants and animal life. A small-scale ecological survey indicated that 80% of the quartz rocks in the area … …OnLine Journal of Biological Sciences, Vol. 14, Issue 1 · 11 Feb 2014 · 7,302 accessesView PDFCite
Research ArticleOpen accessIn the abstractINVESTIGATION STUDIES ON SUB-COOLING OF CRYOGENIC LIQUIDS USING HELIUM INJECTION METHODT. Ramesh, K. ThyagarajanIn cryogenic propellants, the sub-cooling of cryogenic propellants contained in tanks is an important and effective method for bringing down the lift-off mass of launch vehicle and thus the performance of the rocket engine is greatly improved. This study presents the technical and experimental studies conducted on cryogenic liquids such as Liquid Oxygen, Liquid Nitrogen and Liquid Hydrogen using helium … …American Journal of Applied Sciences, Vol. 11, Issue 5 · 10 Feb 2014 · 6,801 accessesView PDFCite
Research ArticleOpen accessIn the abstractTunneling Operations, Occupational S&H and Environmental Protection: A Prevention Through Design ApproachDavide Labagnara, Alberto Martinetti, Mario PatruccoThe study refers on the main results of a research work that has been carried out by the Safety and Health group of the Department of Environment, Land and Infrastructure Engineering (DIATI) at the Politecnico di Torino, with reference to the substantial difference that exists between the case of an established absence of hazards due to the presence of noxious … …American Journal of Applied Sciences, Vol. 10, Issue 11 · 11 Sep 2013 · 6,768 accessesView PDFCite
Research ArticleOpen accessIn the abstractExperimental Study on Natural Fibers for Green Acoustic Absorption MaterialsLamyaa Abd ALRahman, Raja Ishak Raja, Roslan Abdul RahmanNatural fibre materials are one of the major ways to improve environmental pollution and new materials need to be considered to find the best solutions. This study presents an experimental investigation on pure micro porous materials from two types of fibers: Date Palm Fibre (DPF) and Coconut Coir Fibre (CCF). This study was conducted to examine the potential for using … …American Journal of Applied Sciences, Vol. 10, Issue 10 · 6 Sep 2013 · 8,782 accessesView PDFCite
Research ArticleOpen accessIn the abstractSeismic Refraction Method: A Technique for Determining the Thickness of Stratified SubstratumOchuko AnomohanranThe seismic refraction survey is a very important geophysical technique used in the investigation of subsurface characteristics. This is why this study was carried out to emphasize the ability of the seismic refraction method in determining the thickness of stratified layers of soil and rock. The results obtained are generalized expressions that relate travel time, offset distance, velocity and thickness … …American Journal of Applied Sciences, Vol. 10, Issue 8 · 24 Jul 2013 · 7,684 accessesView PDFCite
Research ArticleOpen accessIn the abstractPotential Zones of Peruvanthanam and Valiyathodu Sub-Watersheds of Manimala River BasinVadakkepurakkal Rekha, Aikara Varkey George, Rita MendezGroundwater is a dynamic and replenishable natural resource. But in hard rock terrains, its availability is of limited extent. In sub-watershed studies, remote sensing and GIS techniques have the advantages of spatial, spectral and temporal data, covering large and inaccessible areas within a short span of time. Thus this technique has become a very handy tool in assessing and monitoring … …American Journal of Environmental Sciences, Vol. 9, Issue 1 · 20 Feb 2013 · 7,389 accessesView PDFCite
Research ArticleOpen accessIn the abstractNatural Radioactivity at an Uraniferous SiteClaudio de Carvalho Conti, Esau Francisco Sena Santos, Isabel Cristina Poquet SalinasThe aim of this study is to evaluate the soil composition, the radioactive isotopes concentration and the outdoor air Kerma in the region of the Uraniferous Province of Lagoa Real, Bahia State, located at northeast of Brazil. It has used data from an airborne gamma-ray survey previously carried out in the region, namely Projeto Sao Timoteo and computer simulations of … …Energy Research Journal, Vol. 3, Issue 1 · 14 Feb 2013 · 7,456 accessesView PDFCite
Research ArticleOpen accessIn the abstractMorphological Features of Rodoretto Valley Deep-Seated Gravitational Slope DeformationsMaria Gabriella Forno, Andrea Lingua, Stefano Lo Russo, Glenda TaddiaA new, detailed survey of the Rodoretto Valley (Western Alps, Italy) has been conducted resulting in the production of a new morphological and quaternary geological map of the area. The authors used the innovative Solid (True) Ortho-Photo (STOP) technology integrated with navigation sensors (Global Navigation Satellite System-GNSS/Inertial Measurement Unit-IMU). This state-of-the-art procedure has demonstrated several operational advantages during both the … …American Journal of Environmental Sciences, Vol. 8, Issue 6 · 9 Feb 2013 · 7,031 accessesView PDFCite