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Showing 1 to 20 of 252 for “"Flue"”.
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Flue-cured tobacco: alternative management systems
The United States share of the exported flue-cured tobacco market has decreased over the last decade as other countries have increased production of improved quality tobacco. Such tobacco is available at a substantially lower price than U. S. tobacco and thus desirable for the manufacture of less …
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Strip-till flue-cured tobacco production in Virginia
Flue-cured tobacco (Nicotiana tabacum L.) is an intensively cultivated crop that typically receives four to eight primary tillage passes before being transplanted on a raised row-ridge. Strip-tillage, a conservation tillage system that only requires tilling a small strip before transplanting, has …
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Studies of Low-Nicotine Flue-Cured Tobacco Production
Flue-cured tobacco (Nicotiana tabacum) has been managed to optimize the yield of high-quality cured leaf while maintaining nicotine levels within a relatively narrow range based on the Regional Minimum Standards Program. Among the 3,000 plus alkaloids found in tobacco, nicotine accounts for greater …
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Flue gas CO₂ capture using electrochemically mediated amine regeneration
… (EMAR) process for the capture of CO₂ from flue gas. The absorption step in the EMAR process is the same as in the widely used amine process, but the desorption step is accomplished electrochemically as opposed to a thermal swing. The EMAR process has several potential advantages over …
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Quarterly import demand for North American flue-cured tobacco
Decreases in the North American market share of flue-cured tobacco exports indicates that producers on this continent have entered into an era of competition from foreign flue-cured tobacco exporters. In order to understand this problem and obtain additional information on the factors influencing …
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Raman-based measurements of greenhouse activity of combustion flue gases
Gases that are capable of absorbing and emitting infrared radiation due to their molecular structure are known as infrared active gases. Infrared activity is the underlying reason for the greenhouse effect. Hence, greenhouse gases are all infrared active. The vibrational/rotational structure that …
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Evaluation of modified dry limestone process for flue gas desulfurization
… of the Modified Dry Limestone Process (MDLP) for flue gas desulfurization. Two types of limestone, one calcitic and one dolomitic, were used. These materials were characterized by ICP analysis, X-ray diffraction, optical microscopy, SEM, and electron microprobe before and after reaction. …
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Characterizing resistance in flue-cured tobacco to Globodera tabacum solanacearum
Resistance to Globodera tabacum solanacearum in flue-cured tobacco was characterized in vitro, in the greenhouse, and field. The objectives of this study included evaluation of hatching of G. t. solanacearum as stimulated by root exudate, penetration and development of G. t. solanacearum on roots, …
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Responses of flue-cured tobacco to harvesting and curing variables
Two flue-cured tobacco varieties (Nicotiana tabacum L.) and eight harvesting and curing methods were simultaneously evaluated. Harvesting variables involved the removal of different leaf numbers on different schedules. Curing methods included single or separate barn conventional curing and a bulk …
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A Study of Hg Adsorption and Reactions in a Flue Gas
… Hg adsorption and oxidation in a simulated flue gas system were studied. Density functional theory using B3LYP paramerization were used to calculate binding energies, thermodynamic parameters, and kinetic constants. Binding energy calculations show that HCl, SO<sub>2</sub>, or NO<sub>2</sub> …
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Thermal swing membrane based method for CO2 capture from flue gas
… global warming, is released in large amounts by flue gases. To limit climate change, such CO_2 emissions have to be reduced, CO_2 captured and sequestered. Conventional monoethanolamine (MEA)-based absorption techniques are costly due to high capital cost and high energy consumption since the …
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Modeling flue pipes--subsonic flow, lattice Boltzmann, and parallel distributed computers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Influence of ethephon on growth and flowering of flue-cured tobacco
… of ethephon (2-chloroethylphosphonic acid) influences growth and flowering of flue-cured ‘NC 82’ tobacco; 2) examine the relationship between temperatures in the seedling environment and premature flowering and determine how time of plant bed cover removal affects premature flowering; and 3) …
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Evaluating the potential of aerial remote sensing in flue-cured tobacco
Flue-cured tobacco (Nicotiana tabacum L.) is a high value-per-acre crop that is intensively managed to optimize the yield of high quality cured leaf. Aerial remote sensing, specifically unmanned aerial vehicles (UAVs), present flue-cured tobacco producers and researchers with a potential tool for …
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Mass flow and temperature measurements in the flue of a woodburning appliance
… manufacturers can afford it. For this reason, flue loss methods which are generally less expensive are attractive. Flue loss methods measure either directly or indirectly the following instantaneous losses: 1. Sensible energy loss due to the flue gases being at a higher temperature than the …
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Interferences with measurements of CO, CO₂, and O₂ in woodstove flue gases
Concentrations of CO, CO₂, and O₂ in woodstove flue gases are some of the measured inputs required by algorithms used to calculate woodstove efficiency by the stack loss method. Since these algorithms have been shown to be very sensitive to small errors in these input values, it was necessary to …
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