摘要:

The exciting discoveries of the past few years along with the key participants in the superconducting field are examined in this report. The current and possible future uses of superconductors are shown to be imaginative and very important. The past, present, and future of superconductors is studied in a technical and historical context. From the beginning back in 1911 to the exciting discoveries of today, superconductors are quite a phenomenon. The conventional theory of superconductors does not explain the newly discovered “ high” temperature superconductors. The structure of the superconducting ceramics are very similar and their current densities are directly related to alignment of grain boundaries. The manufacturing process is rather straightforward but care must be exercised to insure reaching the superconducting phase. Many current industrial processes use superconductors. Long distance superconducting power transmission lines are not economically feasible at the present time

ISSN:0090-8312    

DOI:10.1080/00908318808908923

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Plastic green houses are now widely used in the Middle East. These houses are made of transparent materials and the interior air temperature is higher than the ambient temperature because of the solar irradiation. This temperature difference causes natural convection flows. For a typical green house, the resulting usable power is about 200 W. Two pumping systems are considered that can utilize this power for pumping underground water for irrigation purposes.

ISSN:0090-8312    

DOI:10.1080/00908318808908924

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

We modified Black Oil Applied Simulation Tool ( BOAST) Program for gas reservoirs, and successfully applied it to simulate production of gas from low permeability reservoirs. Our modification results in significant decrease in computational time and storage requirements, and allows us to reduce the designated grid blocks to the size of the high permeability zone and even the fracture. Pressure and saturation of gas and water were calculated at different locations in the reservoir during the production. Our calculation showed that the coproduction of gas and water and presence of the high permeability layers or the induced fractures significantly enhance the economical production of gas from low permeability reservoirs.

ISSN:0090-8312    

DOI:10.1080/00908318808908925

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Dielectric logs can be used to locate and quantitatively evaluate geopressured environments by (a)establishing empirical calibration charts for a given formation or geologic region and/ or (b) using the equivalent depth method.

ISSN:0090-8312    

DOI:10.1080/00908318808908926

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

摘要:

Preliminary studies on the formation of the carbonaceous mesophase from a petroleum-derived asphalt by Conoco was carried out through solvent fractionation. The pentane solubles fraction produced a mesophase with a texture of medium-grained mosaics, while the asphaltene fraction yielded fine-grained mosaic structures, but gave a much higher carbonization yield. Further separation of the pentane solubles was achieved through elution with the following solvents of increasing polarity: (1) hexane, (2) toluene, (3) toluene/ methanol (4:1), (4) toluenelmethanol (2:1) (5) methanol. It was found that the toluene fraction gave the best mesophase with a coarser grained mosaic texture than even that of the pentane solubles fraction from which it was derived. The results were explained in terms of the plasticity of the system, which differed depending on the nature of the precursor molecules present in the various fractions.

ISSN:0090-8312    

DOI:10.1080/00908318808908927

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

ISSN:0090-8312    

DOI:10.1080/00908318808908928

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor

ISSN:0090-8312    

DOI:10.1080/00908318808908929

出版商:Taylor & Francis Group    

年代:1988

数据来源: Taylor