DISCUSSION OF "The Topographic Approach to Locating High-Yield Wells in Crystalline Rocks: Does It Work?" by Zhi-Yong Yin and George A. Brook, January-February 1992 issue. v. 30, no. 1, pp. 96-102     

Ralph C. Heath 《Ground water》1992,30(4):618-619

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Comparison of Backscatter Ultraviolet (BUV) and ground-based total ozone fields for December 1970     

A. J. Miller  B. Korty  D. F. Heath 《Pure and Applied Geophysics》1978,117(3):355-360

For the period December 1970, comparison is made between the monthly average analyses (mapped fields) of the Backscatter Ultraviolet (BUV) total ozone data and the ground-based observations. In particular, significant differences of over 50 Dobson units are noted over the region of the North Atlantic Ocean with the BUV of greater magnitude than the ground-based data. As part of the overall verification program, both analyses are compared against the 100 mb height fields. The results indicate that the BUV analysis in the region of question is the more consistent of the two.  相似文献   

Viability of American oyster,Crassostrea virginica,spermatozoa exposed to stress     

Curt D. Rose  Ellen Heath 《Estuaries and Coasts》1978,1(4):245-251

Viability was determined for oyster spermatozoa maintained in salt water for extended periods after activation and for spermatozoa exposed to thermal and chemical stress. Determinations were based on methods that employ motile gametes and gametes in which eosin-nigrosin stain is repelled as estimates of viability. Motility of spermatozoa maintained in salt water at 25C diminished from 90% to 10% at 173 h after activation. Number of unstained gametes decreased from 95% to 26% at 10 h after activation, and further declined to 6% at 173 h. Spermatozoa exposed to temperatures of ?20, 50, and 60 C, and immersed in a phenol-formaldehyde-alcohol solution exhibited motilities of 43, 38, 11, and 7%, respectively, as compared to 90% for unstressed spermatozoa. Percent of unstained gametes after exposure to the above-described stresses was 59, 31, 7, and 0%, respectively, in contrast to 93% for unstressed controls. Correlation between results generated by the motility and staining methods of estimating viability is not significant at the 0.95 probability level.  相似文献   

Brunhes time scales and the interpretation of climatic change     

M.A. Kominz  G.R. Heath  T.-L. Ku  N.G. Pisias 《Earth and Planetary Science Letters》1979,45(2):394-410

Two new δ¹⁸O time scales have been developed for the Brunhes Epoch using equatorial Pacific core V28-238. The first is based on a constant accumulation rate of aluminum, an assumption which has been shown to be acceptable for the last 360,000 years of the record by comparison with ²³⁰Th ages determined via the continuous strip-sample technique. The aluminum scale yields an age of 138,000 years for termination II and 693,000 years for the Brunhes-Matuyama reversal. Spectral and cross spectral analysis of the δ¹⁸O records of V28-238 and a detailed composite Indian Ocean record, using the aluminum time scale as well as two earlier time scales, indicates that the Pleistocene climate has been forced by periodic fluctuations of the earth's obliquity and precession. Based on this result, the second new time scale (TWEAQ) has been derived by tuning the δ¹⁸O record of V28-238 to the record of the earth's obliquity. TWEAQ yields an age of 127,000 years for termination II and 728,000 years for the Brunhes-Matuyama reversal. Spectral analysis of the δ¹⁸O record dated by TWEAQ indicates that 30% of the variance of the ice volume record can be ascribed to linear forcing by the earth's orbital parameters, but the trend of the data is consistent with a stochastic model.  相似文献   

Phase relations between the over- and fundamental-tides     

Dr. Ronald Allan Heath 《Ocean Dynamics》1980,33(5):177-191

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Oceanographic studies supporting the assessment of deep-sea disposal of defueled decommissioned nuclear submarines     

G. Ross Heath  David K. Rea  Gordon Ness  R. Dale Pillsbury  Thomas M. Beasley  Carlos Lopez  Daniel M. Talbert 《Environmental Geology》1984,6(4):189-199

Based on criteria developed by the international Atomic Energy Agency (IAEA), potential disposal sites for defueled, decommissioned nuclear submarines appear to exist in deep water south of the Mendocino Fracture Zone within 200 nautical miles of the United States Oceanographic measurements in the water column and at the sea floor in a study area (W-N) at 39 5°N, 127 5°W will allow the operational and radiological consequences of deep-sea disposal to be compared with land burial of old submarines. The W-N studies also are yielding new data that will provide insights to the deposition and early diagenesis of distal hemipelagic sediments Royalty-free reproduction of this article by the U S Government or by the authors for U S. Government purposes is permitted.  相似文献   

Cost-Effective Monitoring Strategies to Estimate Mean Water Table Depth   总被引：1，自引：0，他引：1  

H.E. Mew Jr.    M.A. Medina Jr  R.C. Heath  K.H. Reckhow  T.L. Jacobs 《Ground water》1997,35(6):1089-1096

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The use of high temperature gas chromatography to study the biodegradation of high molecular weight hydrocarbons     

D. J. Heath  C. A. Lewis  S. J. Rowland 《Organic Geochemistry》1997,26(11-12)

A consequence of the biodegradation of petroleum is that lower molecular weight compounds are removed preferentially to higher molecular weight (HMW) compounds greater than triacontane (n-C₃₀). The extent to which the latter compounds are biodegraded has rarely been studied. Reasons for this include the technical difficulties associated with carrying out biodegradability tests with solid, water-insoluble substances and the limits of the analytical techniques, such as gas chromatography (GC).A quantitative high temperature GC (HTGC) method was developed to monitor the biodegradation of the aliphatic fraction of a waxy Indonesian oil by Pseudomonas fluorescens. Recoveries of over 90% were obtained for n-alkanes up to hexacontane (C₆₀) using liquid-liquid continuous extraction. After only 14 days, 80% of the aliphatic hydrocarbons had been degraded. At the end of the 136-day study, 14% of the original fraction remained. This comprised mainly C₄₀₊ compounds. No decrease in the concentrations of compounds above C₄₅ was observed. However, the use of a rapid screening biodegradation method provided tentative proof that Pseudomonas fluorescens was capable of utilising n-alkanes up to C₆₀ once the bacteria had acclimated to HMW alkanes.  相似文献   

Regional variability in the trophic requirements of shelf sea fisheries in the Northeast Atlantic, 1973-2000     

Heath  Michael R. 《ICES Journal of Marine Science》2005,62(7):1233-1244

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Changes in the structure and function of the North Sea fish foodweb, 1973-2000, and the impacts of fishing and climate   总被引：1，自引：0，他引：1  

Heath  Michael R. 《ICES Journal of Marine Science》2005,62(5):847-868

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