摘要:

The concentrations of indoor radon in the basements of homes located in southern Maryland average 1.3 times the first-floor radon concentrations. Particular geological units tend to be associated with higher indoor radon. In the study area, homes underlain by phyllite are generally above 4 pCi / L (the U.S. Environmental Protection Agency “action level”). Comparative studies between indoor radon and total-gamma aeroradioactivity show that aeroradioactivity can be accurately used to estimate community radon hazards. When combined, geology and aeroradioactivity can be used to identify problem homes.

ISSN:0090-8312    

DOI:10.1080/00908319708908879

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

By employing the energetic optimization technique, the optimum performance of an irreversible Cannot heat engine system driven by a corrugated sheet collector is investigated at maximum power output. The maximum overall efficiency of the system is expressed in terms of the operating parameter of the collector and the cycle-irreversibility parameter of the heat engine.

ISSN:0090-8312    

DOI:10.1080/00908319708908880

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

Liquefaction of cellulosic feeds slurried in Shellsol solvents was investigated at 350-400°C under a reducing gas atmosphere using different types of nickel catalysts. The aromatic solvent, Shellsol AB, has been shown to be a very effective suspension medium for feedstocks. The use of this processing liquid is attractive in terms of cheapness and ease of product separation. The aliphatic counterpart Shellsol T is not suitable as a suspension medium. The biomass feeds produced high yields of oils low in oxygen, very low in nitrogen, and containing no sulfur.

ISSN:0090-8312    

DOI:10.1080/00908319708908881

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

The ammonia-water absorption refrigeration system is attracting increasing research interests, since the system can be powered by waste thermal energy, thus avoiding using ozone-depletion refrigerants and reducing demand on electricity supply. In the article, a mathematical model coupled with detailed equations for thermodynamic properties of an ammonia-water mixture is described A computer simulation software based on the model is developed. With the software, the performance characteristics of ammonia-water absorption refrigeration systems are analyzed, and detailed optimum operation maps for the systems are presented. These maps can be used as guides in choosing operating conditions for designing such systems or for existing systems.

ISSN:0090-8312    

DOI:10.1080/00908319708908882

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

This article provides an economic analysis of electricity generation through the installation of photovoltaic (PV) panels at the American University of Armenia. Values influencing the economic expediency of the project are determined and described. A variety of scenarios are considered, including parameter variations of electricity prices within Armenia, PV panel cost per peak watt, and limitations imposed by the available roof-top area. Calculations show that at present it is not economically justifiable to invest in this project.

ISSN:0090-8312    

DOI:10.1080/00908319708908883

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

A comparison has been made between radon in drinking water and the incidence of cancer using a set of home occupants in Virginia and Maryland. In a subset of people who drink radon-free but chlorinated drinking water from a reservoir, about 3% develop some type of cancer. In a subset of people who drink low-radon water from private water wells, about 3% develop cancer. In a subset who drink high-radon well water, about 6% develop cancer. A comparison with Environmental Protection Agency (EPA) estimates of cancer related to airborne radon indicates that for the general population, the incidence of radon-related cancer from drinking water is similar to the incidence of cancer from inhaled radon. For the 10% of the population that consumes well water and, in particular, for the 5% of the population that consumes high-radon well water, the drinking water carries a considerably higher cancer risk than inhaling airborne radon.

ISSN:0090-8312    

DOI:10.1080/00908319708908884

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

This article discusses the role of chemical energy and exergy of raw material in industrial processes. The methods for calculation of chemical energies and exergies of some kinds of raw material are described. Their influence on consumption of conventional energy forms (fuel, heat, electricity) by the complete energy balance is shown. Consideration of the chemical energy and exergy in the national energy balances is suggested.

ISSN:0090-8312    

DOI:10.1080/00908319708908885

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

The purpose of this study was to examine the ash removal efficiency of sodium hydroxide leaching from Assam coking coal so that it could be used for the manufacture of graphite electrodes. The parameters tested were sodium hydroxide concentration, panicle size of coal, NaOH solution / coal ratio, leaching temperature and time, and heat treatment of coal. Increase in NaOH concentration up to 500 gL−1was found to increase the extent of ash removal. The ash content of the leached coal decreased with decrease in particle size, but very finely ground (− 72 mesh) particles reduced the ash removal rate. Increase in leaching temperature (50-120°C) and time (30-180 min) considerably reduced the ash content of the leached coal. Heat-treated (at 1300°C) coal (i.e., coke) has much lower ash removal efficiency than raw coal.

ISSN:0090-8312    

DOI:10.1080/00908319708908886

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

This article deals with the scientific and practical problems related to estimating oil and gas reserves in terrigenous reservoirs of the Productive Series of middle Pliocene and in Upper Cretaceous volcanic and sedimentary rocks. The deposits in question are spread over onshore Azerbaijan and adjacent offshore areas in the Caspian Sea and are approximately 6.5 km deep. This article presents lithologic, stratigraphic, and petrophysical criteria used for selecting prospects for reserve estimation. Also presented are information on structure of rocks and estimation of their lithologic and physical properties. New methods for the interpretation and application of petrophysical and logging data, as well as statistical estimation of reserves, in complex volcaniclastic reservoir rocks, are also discussed.

ISSN:0090-8312    

DOI:10.1080/00908319708908887

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor