Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 87 for “"air mass"”.
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Summer air mass instability and its synoptic representation
Thesis (M.S.) Massachusetts Institute of Technology. Dept. of Meteorology, 1945.
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Distribution of air mass thunderstorms in New England.
Massachusetts Institute of Technology. Dept. of Meteorology. Thesis. 1966. M.S.
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Areal coverage of storm precipitation : observations of air mass thunderstorms
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1986.
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Air mass analysis : a graphical means of identifying air masses
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1930.
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Analysis of Urban Heat Island Intensity Through Air Mass Persistence
… heat island (UHI) magnitudes by weather type, or air mass classification. This study presents an analysis of UHI intensity through synoptic-scale air mass persistence during the spring season for four UHI-prone United States cities. Historical daily weather types for Birmingham, Alabama; …
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Tracer-Independent Approaches to Stratosphere-Troposphere Exchange and Tropospheric Air Mass Composition
… residence time τ and the regions where air enters and exits the stratosphere, the one-way flux is quantified robustly without being rendered ill-defined by the short-τ eddy-diffusive singularity. Diagnostics are first computed using an idealized circulation model that has topography only …
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Virtual sensor for air mass flow measurement in an SI engine: Application of distributed lumped modelling in prediction of air mass flow into the cylinder of SI combustion engines
After undergoing an extensive study about engine air mass flow measurement approaches as well as engine modelling for air mass flow prediction, a major problem found to exist is that engineers have still not found a suitable technique to accurately measure the air mass flow entering the cylinder of …
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Long-term Changes in Synoptic-Scale Air Mass Persistence Across the United States
From a climate dynamics perspective, air mass persistence reflects variability in the dynamic nature of the atmosphere. In this study, a historical analysis of synoptic air mass persistence across the continental United States is presented to portray spatial and temporal variability and trends in …
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Characterization of the physical, chemical, and optical properties of atmospheric aerosol particles in New Hampshire
… Forest in northern NH showed that synoptic-scale air mass transport heavily influenced aerosol properties, and hence regional visibility. During W/SW flow, aerosol parameters and haziness were generally twice as high as times of N/NE flow. Similar transport dependent results were observed in …
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Thermal performance of backflow solar air heating with integrated nanoparticle enhanced pcm absorber storage system
… storage integrated with a back pass solar air heater (SAH). The purpose of this study is to design, fabricate and evaluate the performance of SAH with integrated nanoparticles enhanced phase change material (PCM) absorber storage system. Three different SAH configurations have been designed …
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Observation of New Particle Formation in the Northern Hemisphere at Altitude from 4 to 20 km
… the characteristics of NPF events and the air mass convective and/or advective transport. CO and O3 act as tracers of tropospheric and stratospheric air, respectively, their statistical relationship can be used to quantify air mass characteristics and origins. The mixing ratio values of CO …
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THE IMPACTS OF ATMOSPHERICALLY DERIVED METALS ON COASTAL MARINE SYSTEMS
… associated with populations of contrasting air mass sources (i.e. Atlantic and UK/European), being greatest in the UK/European air mass sector for Al, Fe, Mn, Cd, Mo and Pb, owing to enhanced source emission rates from continental Europe. Based on the current work, refined budgets for Ni and …
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Studies of Arctic Tropospheric Ozone Depletion Events Through Buoy-Borne Observations and Laboratory Studies
… from coastal sites indicates that Arctic air masses devoid of O3 most often pass over sea ice-covered regions before arriving at an observation site, suggesting ODE chemistry occurs upwind over the frozen Arctic Ocean. However, outside of coastal observations, there exist very few …
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Numerical Investigations of Air Flow and Heat Transfer in Axial Flux Permanent Magnet Electrical Machines
… this study an investigation of heat transfer in air cooled Axial Flux Permanent Magnet (AFPM) electrical machines is carried out. Efficiency of electrical machines is strongly influenced by an effective cooling which is provided by forced convection: air enters the generator through the opening …
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Tracing the global carbon cycle with bomb radiocarbon
… shown to be a powerful tool for investigating air mass transport in atmospheric transport models. Second, a serious mismatch in the global bomb radiocarbon budget has been detected, suggesting that the oceans take up 25 less anthropogenic CO2 than hitherto believed. Third, tracking both the …
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The effect of operating conditions on emissions from a two-stage lump coal combustor
… The parameters that were varied include primary air mass flow rate, secondary air mass flow rate, secondary air temperature, secondary air inlet velocity, and secondary air swirl. Each parameter was varied independently to attempt to isolate its effect on emissions. In addition, radial and axial …
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Transferência de calor no escoamento bifásico de dois componentes, regime anular, tubo vertical
… coeficient during the two phase upflow (water + air) in vertical tubes was developped. The design and construction of the equipment is then discussed. The experiments were carried out in one tube, 6mm int and 1500mm of length, which suffered heat fluxes ranging 2 from 0,225 to 0,704 cal/scm². The …
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Structure of an east coast cyclone derived from airborne radar and model diagnostics
Data from airborne W-band radar along with Weather Research and Forecasting (WRF) Model thermodynamic fields and air-parcel back trajectories from the HYSPLIT model are used to determine causes of finescale features of a northeast U.S. cyclone and link them to synoptic and air mass structure. The …
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Modeling of operating temperature performance of triple junction solar cells using Silvaco's ATLAS
… shown for a multi-junction cell operating under Air Mass 0 at 300K, 325K, 350K, and 375K.
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Preliminary design and integration procedures for gas turbine intercoolers on naval combatants
… is comprised of two types of heat exchangers; an air to ethylene glycol, plate fin heat exchanger, and an ethylene glycol to seawater shell and tube heat exchanger. The direct system utilizes an air to seawater shell and tube heat exchanger. The analysis requires, as input, air mass flow rates, …
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