oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Análisis del entorno sinóptico asociado con eventos de Bow-Echo en la Provincia de Buenos Aires Synoptic Environment Analysis Associated With Bow - Echo Events In The Province Of Buenos Aires  [cached]
Marcela Torres Brizuela,Ricardo Vidal,Yanina García Skabar,Matilde Nicolini
Meteorologica , 2011,
Abstract: Durante la madrugada del día 21 de Octubre de 2008 se desarrollaron tres líneas convectivas en la provincia de Buenos Aires, captadas por los radares meteorológicos de las localidades de Ezeiza y Pergamino. La estructura espacial y evolución temporal del campo de reflectividad de estos sistemas, configuración de línea en arco, responde al modo convectivo conocido con el nombre de “bow-echo”. La imagen doppler del radar de Ezeiza registró un fenómeno típico en la parte posterior de estas líneas en arco: los vientos intensos mayores a 20 m.s-1. El objetivo principal de este estudio es comprender las condiciones sinópticas que acompa aron la ocurrencia de estos sistemas para poder contribuir al pronóstico de su ocurrencia. En este evento las condiciones de humedad especifica en la zona del norte de la provincia de Buenos Aires (q≥ 12-14 g.kg-1), así como la de cortante vertical del viento por debajo del nivel de 700 hPa (Us>15 m.s-1) coinciden en indicar al entorno como favorable al desarrollo del mismo, aunque no así los valores disponibles de CAPE evaluados para parcelas que se elevan desde superficie. During the morning hours on October 21 2008, three convective lines developed over the Buenos Aires province, and were captured by the meteorological radars located at Ezeiza and Pergamino. The spatial structure and temporal evolution of the reflectivity field of these convective systems present the attributes of the particular convective system referred to as a “bow-echo”. Ezeiza doppler radar images, captured winds stronger than 20 m.s-1 behind these arc lines, a phenomenon that frequently characterizes the presence of a bow-echo. The main objective of this study is to understand the synoptic weather conditions accompanying the occurrence of these bow echo events to enhance the weather forecasting of these systems. On this particular case the specific humidity field over the northern part of the Buenos Aires province (q≥ 12-14 g.kg-1) and also the environmental vertical wind shear values below 700 hPa meet the required conditions to develop a bow-echo event, although the available surface level CAPE values do not promote this event.
Análisis del entorno sinóptico asociado con eventos de Bow-Echo en la Provincia de Buenos Aires
Torres Brizuela,Marcela; Vidal,Ricardo; García Skabar,Yanina; Nicolini,Matilde; Vidal,Luciano;
Meteorologica , 2011,
Abstract: during the morning hours on october 21 2008, three convective lines developed over the buenos aires province, and were captured by the meteorological radars located at ezeiza and pergamino. the spatial structure and temporal evolution of the reflectivity field of these convective systems present the attributes of the particular convective system referred to as a “bow-echo”. ezeiza doppler radar images, captured winds stronger than 20 m.s-1 behind these arc lines, a phenomenon that frequently characterizes the presence of a bow-echo. the main objective of this study is to understand the synoptic weather conditions accompanying the occurrence of these bow echo events to enhance the weather forecasting of these systems. on this particular case the specific humidity field over the northern part of the buenos aires province (q≥ 12-14 g.kg-1) and also the environmental vertical wind shear values below 700 hpa meet the required conditions to develop a bow-echo event, although the available surface level cape values do not promote this event.
Life Cycle Energy of Low Rise Residential Buildings in Indian Context  [PDF]
Talakonukula Ramesh, Ravi Prakash, Karunesh Kumar Shukla
Open Journal of Energy Efficiency (OJEE) , 2014, DOI: 10.4236/ojee.2014.34012
Abstract: Life cycle energy of the building accounts for all energy inputs to the buildings during their intended service life. Buildings need to be constructed in such a way that energy consumption in their life cycle is minimal. Life Cycle Energy (LCE) consumption data of buildings is not available in public domain which is essentially required for building designers and policy makers to formulate strategies for reduction in LCE of buildings. The paper presents LCE of twenty (20) low rise residential buildings in Indian context. LCE of the studied buildings is varying from 160 - 380 kWh/m2 year (Primary). Based on the LCE data of studied buildings, an equation is proposed to readily reckon LCE of a new building.
A Methodology for Selection of Optimum Power Rating of Propulsion Motor of Three Wheeled Electric Vehicle on Indian Drive Cycle (IDC)  [PDF]
Prasun Mishra,Suman Saha,H. P. Ikkurti
International Journal on Theoretical and Applied Research in Mechanical Engineering , 2013,
Abstract: Optimum power rating of propulsion motor is an important issue for designing efficient drive train for a three wheeled battery operated electric vehicle application on standard drive cycle like Indian Drive Cycle of Indian urban and suburban areas. This paper deals with proper estimation of power rating of electric motor by root means square technique while considering the limitations of overloading and under loading operation of motor used in electric vehicle along with some specified design parameters, aiming towards better performance than that of a conventional IC engine driven vehicle. Dynamics of three wheeled vehicle is simulated on MATLAB/Simulink environment under a sequence of road grade angle variation in Indian Drive cycle (IDC), which is formulated by Automotive Research Association of India, Pune. Using simulated vehicle dynamics, power rating of the motor is estimated so that it can be operated efficiently and safely throughout the entire Indian drive Cycle.
Multisensor CPHD filter  [PDF]
Santosh Nannuru,Stephane Blouin,Mark Coates,Michael Rabbat
Statistics , 2015,
Abstract: The single sensor probability hypothesis density (PHD) and cardinalized probability hypothesis density (CPHD) filters have been developed using the random finite set framework. The existing multisensor extensions of these filters have limitations such as sensor order dependence, numerical instability or high computational requirements. In this paper we derive update equations for the multisensor CPHD filter. We propose a computationally tractable implementation that greedily identifies measurement subsets and partitions that significantly contribute to the update equations.
Multisensor estimation: New distributed algorithms
Plataniotis K. N.,Lainiotis D. G.
Mathematical Problems in Engineering , 1997,
Abstract: The multisensor estimation problem is considered in this paper. New distributed algorithms, which are able to locally process the information and which deliver identical results to those generated by their centralized counterparts are presented. The algorithms can be used to provide robust and computationally efficient solutions to the multisensor estimation problem. The proposed distributed algorithms are theoretically interesting and computationally attractive.
The Asian war bow  [PDF]
Timo A. Nieminen
Physics , 2011,
Abstract: The bow is one of the earliest complex machines, a prime example of the storage and transfer of energy. The physics of the bow illuminates compromises and design choices made in Asian military archery.
Life cycle assessment of producer gas derived from coconut shell and its comparison with coal gas: an Indian perspective
Chenicheri Chandroth Sreejith, Chandrasekharan Muraleedharan and Palatel Arun
International Journal of Energy and Environmental Engineering , 2013, DOI: 10.1186/2251-6832-4-8
Abstract: Oil dependency and global warming have stimulated R&D activities on the utilization of secondary biofuels. This article investigates the suitability of coconut shell-derived producer gas (a secondary gaseous biofuel) as a substitute for coal gas from an environmental perspective using life cycle assessment (LCA) approach. Thermochemical gasification in an air-fluidized bed with steam injection is the gaseous fuel production process. LCA is carried out with respect to Indian conditions based on primary and modified Ecoinvent 2.0 data using IMPACT 2002+ environmental impact assessment methodology. The study indicates that coconut shell-derived producer gas life cycle is capable of saving 18.3% of emissions causing global warming potential, 64.1% of emissions causing ozone depletion potential, and 71.5% of nonrenewable energy consumption. The analysis of energy and exergy consumptions of the two life cycles reveal that the renewable fraction in the total energy demand is 62.9% for producer gas life cycle, while it is only 2.8% for coal gas life cycle. Allocation of the by-product, coconut palm residues, is the major responsible factor for this reduction in environmental burden. Based on the existing fertilization practice and the utilization of electricity from the Indian electric grid, substantial green house gas (GHG) emission savings cannot be achieved for producer gas life cycle over coal gas life cycle. However, the green electricity-aided catalytic gasification of coconut shell produced by organic farming can result in 43.4% reduction in GHG emissions, meeting European Union renewable energy directive.
Loschmidt Echo  [PDF]
Arseni Goussev,Rodolfo A. Jalabert,Horacio M. Pastawski,Diego Wisniacki
Physics , 2012, DOI: 10.4249/scholarpedia.11687
Abstract: In this article we review the past, present, and future of the Loschmidt Echo.
Life Cycle Energy Analysis of a Multifamily Residential House: A Case Study in Indian Context  [PDF]
Talakonukula Ramesh, Ravi Prakash, Karunesh Kumar Shukla
Open Journal of Energy Efficiency (OJEE) , 2013, DOI: 10.4236/ojee.2013.21006
Abstract: The paper presents life cycle energy analysis of a multifamily residential house situated in Allahabad (U.P), India. The study covers energy for construction, operation, maintenance and demolition phases of the building. The selected building is a 4-storey concrete structured multifamily residential house comprising 44 apartments with usable floor area of 2960 m2. The material used for the building structure is steel reinforced concrete and envelope is made up of burnt clay brick masonry. Embodied energy of the building is calculated based on the embodied energy coefficients of building materials applicable in Indian context. Operating energy of the building is estimated using e-Quest energy simulation software. Results show that operating energy (89%) of the building is the largest contributor to life cycle energy of the building, followed by embodied energy (11%). Steel, cement and bricks are most significant materials in terms of contribution to the initial embodied energy profile. The life cycle energy intensity of the building is found to be 75 GJ/m2 and energy index 288 kWh/m2 years (primary). Use of aerated concrete blocks in the construction of walls and for covering roof has been examined as energy saving strategy and it is found that total life cycle energy demand of the building reduces by 9.7%. In addition, building integrated photo voltaic (PV) panels are found most promising for reduction (37%) in life cycle energy (primary) use of the building.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.