TY - JOUR TI - Use of recompressed impulse response to identify sources and paths of structure-borne noise in wide flange I-beams and pipes conveying fluid AU - Kalme, J.S. AU - Uldrick, J.P. AU - Robinson, W.A. AU - Larrabbee, D. T2 - Journal of Sound and Vibration AB - A procedure is described for identifying sources and paths of structure-born noise in structures built up from wide flange I-beams, as well as piping systems conveying compressible and incompressible fluid. The use of impulse response or modified impulse response to estimate time-delays frequently is of little value because the wave propagation is dispersive. With reflections present, it is impossible to distinguish and identify the wide peaks. If one can establish the dispersion law, namely, the relation between frequency and wave number, one can “recompress” the impulse response in a certain sense, with respect to length of paths. The peaks are fairly narrow and one can identify noise paths. A discussion is given for various dispersion relations, together with theoretical justification and practical implementation. Some experimental results are given. DA - 1984/// PY - 1984/// DO - 10.1016/0022-460X(84)90229-3 VL - 95 IS - 4 SP - 439-467 UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-0021481710&partnerID=MN8TOARS ER - TY - JOUR TI - Summary of an APCA International Specialty Conference AU - Aneja, V.P. AU - Adams, D.F. AU - Pratt, C.D. T2 - Journal of the Air Pollution Control Association AB - Because man now influences the chemistry of the biosphere in so many important ways, it is essential that we understand the complex interrelationships among the chemicals from natural as well as anthropogenic sources and the factors that influence their life cycles. One important grouping of chemical species which influence the atmosphere are the naturally occurring compounds of sulfur, hydrocarbons, halocarbons and nitrogen. While significant efforts have been directed toward the control of similar anthropogenic air pollutants, very limited support has been provided for developing an understanding of the role of natural emissions in air pollution control. Based on the realization that there may be specific cases where control of anthropogenic sources may have only minimal impact on air quality problems and since resources for basic research on the impacts of natural emissions are limited, the Air Pollution Control Association through the Technical Committee on Interactions with the Total Environment sponsored an International Specialty Conference on the Environmental Impact of Natural Emissions. The following brief report is only intended to convey the flavor of the conference. The transactions of the conference will be available from APCA headquarters and are highly recommended. DA - 1984/// PY - 1984/// DO - 10.1080/00022470.1984.10465813 VL - 34 IS - 8 SP - 799-803 UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-0021640473&partnerID=MN8TOARS ER - TY - JOUR TI - Mass transfer of NH3 into water at environmental concentrations AU - Ibusuki, T. AU - Aneja, V.P. T2 - Chemical Engineering Science AB - The mass transfer of NH3, into water at environmental concentrations has been studied in a two-phase flow reactor. The concentration of NH3 in water ranged from 10−6 to 10−4 mole l.−1 and the temperature was chjanged from 12 to 30°C. At the conditions of this experiment, the overall mass transfer coefficient (K) is more dependent on the hydrodynamics of the gas phase than of the liquid phase. No significant concentration or temperature effects on the value of K have been observed. The mass transport of NH3 is interpreted in terms of the individual gas phase and liquid phase mass transfer coefficients. DA - 1984/// PY - 1984/// DO - 10.1016/0009-2509(84)85076-9 VL - 39 IS - 7-8 SP - 1143-1155 UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-0021295277&partnerID=MN8TOARS ER - TY - JOUR TI - Vectorial capacity in Ixodes ticks AU - Spielman, A. AU - Levine, J. F. AU - Wilson, M. L. T2 - Yale Journal of Biology and Medicine DA - 1984/// PY - 1984/// VL - 57 SP - 507-512 ER - TY - JOUR TI - House mouse mites infesting laboratory rodents AU - Levine, J. F. AU - Lage, A. L. T2 - Laboratory Animal Science DA - 1984/// PY - 1984/// VL - 34 SP - 393-394 ER - TY - JOUR TI - Effect of deer reduction and abundance of the deer tick AU - Wilson, M. L. AU - Levine, J. F. AU - Spielman, A. T2 - Yale Journal of Biology and Medicine DA - 1984/// PY - 1984/// VL - 57 SP - 697-706 ER - TY - JOUR TI - IMPACT OF OFF-ROAD VEHICLES ON MACROINVERTEBRATES OF A MID-ATLANTIC BEACH AU - WOLCOTT, TG AU - WOLCOTT, DL T2 - BIOLOGICAL CONSERVATION AB - Potential and actual impacts of off-road vehicle (ORV) use on beach macroinvertebrates were examined on the Cape Lookout National Seashore (North Carolina). Mole crabs Emerita talpoida and coquinas Donax variabilis were not damaged. Ghost crabs Ocypode quadrata were completely protected by burrows as shallow as 5 cm, and therefore were not subject to injury during the day, but they could be killed in large numbers by vehicles while feeding on the foreshore at night. Ghost crab populations on the Seashore were large (10 000 km−1 of beach) and a small proportion of the population would be killed by a single vehicle pass. Nevertheless, predicted population mortalities calculated from observed kills of ghost crabs per vehicle-km ranged from 14–98% for 100 vehicle passes. Currently vehicle use on this beach is light and essentially none occurs on the foreshore after dark. Little impact on beach macroinvertebrates would be expected from this usage pattern. Actual impact on ghost crab populations, assessed by burrow censuses, was negligible. No differences were detected between heavy-use and light-use sites in total population size, average crab size or population change through the heaviest traffic season. However, increases in traffic to levels seen on other beaches, especially night driving, would probably have devastating effects on ghost crab populations. In heavily used areas, banning of ORVs from the foreshore between dusk and dawn may be required to protect this species. DA - 1984/// PY - 1984/// DO - 10.1016/0006-3207(84)90100-9 VL - 29 IS - 3 SP - 217-240 SN - 0006-3207 ER - TY - JOUR TI - Response of marine bacterioplankton to differential filtration and confinement AU - Ferguson, R. L. AU - Buckley, E. N. AU - Palumbo, A. V. T2 - Applied and Environmental Microbiology DA - 1984/// PY - 1984/// VL - 47 IS - 1 SP - 49-55 ER - TY - JOUR TI - PRIMARY PRODUCTIVITY AND PARTICLE FLUXES ON A TRANSECT OF THE EQUATOR AT 153-DEGREES-W IN THE PACIFIC-OCEAN AU - BETZER, PR AU - SHOWERS, WJ AU - LAWS, EA AU - WINN, CD AU - DITULLIO, GR AU - KROOPNICK, PM T2 - DEEP-SEA RESEARCH PART A-OCEANOGRAPHIC RESEARCH PAPERS AB - Abstract Primary productivity (14C) and mass flux measurements using a free-drifting sediment trap deployed at 900 m were made at four stations in the Pacific Ocean between 12°N and 6°S at 153°W. The latitudinal variations in productivity were consistent with historical patterns showing the equator as a zone of high production and the oligotrophic waters north of the equatorial region as an area of low productivity. The correlation coefficient between the two sets of independent measurements was 0.999, indicating that in this oceanic area the activity of the primary producers was closely related to the total mass flux. A re-examination of historical data suggests that the downward flux of particulate organic carbon varies in direct proportion to the quotient of surface primary production raised to the 1.4 power and depth raised to the 0.63 power. DA - 1984/// PY - 1984/// DO - 10.1016/0198-0149(84)90068-2 VL - 31 IS - 1 SP - 1-11 SN - 0198-0149 ER -