Obituary     

Paul C. Jennings 《地震工程与结构动力学》2005,34(8):867-868

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Clearing the muddy waters: using lake sediment records to inform agricultural management     

Adam Carson  Eleanor Jennings  Suzanne Linnane  Siobhán N. Jordan 《Journal of Paleolimnology》2015,53(1):1-15

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Marine evidence for the last glacial advance across eastern Hudson Strait,eastern Canadian Arctic     

Anne E. Jennings  William F. Manley  Brian Maclean  John T. Andrews 《第四纪科学杂志》1998,13(6):501-514

Data from accelerator mass spectrometer radiocarbon dated sediment cores and Huntec high-resolution seismic profiles were used to investigate the age and origin of the sediments in the Eastern Basin of Hudson Strait. The data indicate that the ice-contact and glacial-marine sediments on the basin flanks and much of the upper sequence in the deep floor of the basin were produced during the Noble Inlet advance (8.9 to 8.4 ka), the last northward expansion of the Labrador Dome on to southeastern Baffin Island. On the northern flank of Eastern Basin one sequence of ice-contact sediments and glacial-marine deposits overlies bedrock; the glacial-marine sediments are transitional upslope to ice-contact sediments, and form at least two successive ice-sheet grounding zones. The earliest abundance peaks of benthic Foramininfera in glacial-marine sediments date ca. 8.6 and 8.4 ka, and correlate to sediments near the base of the 58-m-thick glacial-marine section in the deepest part of Eastern Basin. This correlation suggests that Noble Inlet ice was grounded throughout Eastern Basin during the early part of its advance. In later stages the thinning ice produced grounding zones on the basin flanks while glacial-marine sediments were deposited in the deep basin. © 1998 John Wiley & Sons, Ltd.  相似文献   

Gauging the impact of fishing mortality on non-target species   总被引：4，自引：4，他引：0  

Pope  John G.; Macdonald  Dave S.; Daan  Niels; Reynolds  John D.; Jennings  Simon 《ICES Journal of Marine Science》2000,57(3):689-696

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Differences in the response of a striped dolphin (Stenella coeruleoalba) and a harbour porpoise (Phocoena phocoena) to an acoustic alarm   总被引：1，自引：0，他引：1  

Kastelein RA  Jennings N  Verboom WC  de Haan D  Schooneman NM 《Marine environmental research》2006,61(3):363-378

Small cetacean bycatch in gillnet fisheries may be reduced by deterring odontocetes from nets acoustically. However, different odontocete species may respond differently to acoustic signals from alarms. Therefore, in this study a striped dolphin and a harbour porpoise were subjected simultaneously to sounds produced by the XP-10 experimental acoustic alarm. The alarm produced 0.3s tonal signals randomly selected from a set of 16 with fundamental frequencies between 9 and 15kHz, with a constant pulse interval of 4.0s (duty cycle 8%) and a Source Level range of 133-163dB re 1muPa (rms). The effect of the alarm was judged by comparing the animals' respiration rate and position relative to the alarm during test periods with those during baseline periods. As in a previous study on two porpoises with the same alarm, the porpoise in the present study reacted strongly to the alarm by swimming away from it and increasing his respiration rate. The striped dolphin, however, showed no reaction to the active alarm. Based on harbour porpoise audiograms and the specific audiogram of the striped dolphin in the present study, and the low background noise levels during the experiment, both animals must have heard the alarm signals clearly. This study indicates that cetacean species are not equally sensitive to human-made noise disturbance. Therefore, source levels of acoustic alarms should be adapted to the species they are supposed to deter. In addition, alarms should be tested on each odontocete species for which they are intended to reduce bycatch.  相似文献   

Calculation of selected ordinates of fourier spectra     

Paul C. Jennings 《地震工程与结构动力学》1973,2(3):281-293

A method is presented for calculating single or, by repeated use, selected ordinates of Fourier spectra rapidly and efficiently. The approach differs from standard methods in that any frequency consistent with the interval of digitization may be chosen and records of arbitrary length may be analysed. The method is based on the relation between Fourier spectra of an accelerogram and the final response of an undamped oscillator to the same accelerogram. This relation is reviewed and extended to aid the development of the computing method and to assist in the interpretation of Fourier spectrum techniques in earthquake engineering. Because only the terminal values of the response of an undamped oscillator are required to define the Fourier spectra, repeated application of superposition is used to form equivalent excitations with durations of only one-quarter of the period of the oscillator.  相似文献   

The response of veterans hospital building 41 in the San Fernando earthquake     

Avigdor Rutenberg  Paul C. Jennings  George W. Housner 《地震工程与结构动力学》1982,10(3):359-379

During the 9 February, 1971 San Fernando earthquake, Building 41 of the Veterans Administration Hospital was in an area of very strong snaking; being directly over a portion of the causative fault; it is estimated that the building experienced a maximum base shear of 60 to 130 per cent of the weight of the structure. It survived with very minor structural damage, although designed with a lateral force coefficient of only 10 per cent. The study attempts to reconcile these facts by analysis of the transverse response of the building. A code-oriented, lateral force analysis is only partially successful in this reconciliation in that it indicates first yield at lateral loads of 15–20 per cent of the weight of the structure, with a capacity of 35–45 per cent if redistribution of loads among the walls is permitted. The capacity against static overturning is 45–50 per cent. A dynamic analysis of a fixed-base three-dimensional linear model of the structure gives essentially the same results. A third study of a two-dimensional, dynamic model incorporating partial uplift and soil yielding indicates that the successful response of the building is attributable to the large strength built into the structure and the beneficial effects of non-linear soil-structure interaction.  相似文献   

Depositional environment of Sirius Group sediments, Table Mountain, Dry Valleys area, Antarctica   总被引：1，自引：0，他引：1  

James R. Goff  Ian W. Jennings  & Warren W. Dickinson 《Geografiska Annaler: Series A, Physical Geography》2002,84(1):11-24

Outcrops and cores of the Sirius Group sediments were studied at Table Mountain, Dry Valleys area, Antarctica. These sediments form a surficial veneer at least 9.5 m thick. Three facies — a gravelly sandstone, a sandstone, and a sandy conglomerate — are mapped and described from 13 outcrops and three cores. The gravelly sandstone, constituting 13%of all cored material, is bimodal with matrix-supported clasts comprising 5–33%of the facies. Fabric analysis indicates that it was deposited primarily by lodgment from glacial ice but with minor elements of meltout and flow. The sandstone facies, constituting 77%of all cored material, is a well-sorted, fine- to medium-grained sand, which commonly has laminated bedding. It is predominantly a glaciofluvial deposit but has some glaciolacustrine elements. The sandy conglomerate, constituting 10%of all cored material, is a minor facies. It is massive and clast-supported. It was deposited in a high-energy environment suggestive of subglacial meltwater channels.
Sirius Group sediments at Table Mountain are the result of wet-based ice advancing and retreating over waterlain deposits. This is consistent with an advancing ice mass in climatic conditions that were warmer than present. The majority of the sediments were deposited by alpine ice following a similar pathway to the present-day Ferrar Glacier and as such the depositional environment is one that concurs with evidence of a stable East Antarctic Ice Sheet approach. At Table Mountain, the predominantly glaciofluvial and glaciolacustrine facies is inferred to represent a more distal part of the Sirius Group environment than that seen at other outcrops in the Dry Valleys.  相似文献   

Modelling an exploited marine fish community with 15 parameters - results from a simple size-based model   总被引：1，自引：0，他引：1  

Pope  John G.; Rice  Jake C.; Daan  Niels; Jennings  Simon; Gislason  Henrik 《ICES Journal of Marine Science》2006,63(6):1029-1044

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Testing candidate indicators to support ecosystem-based management: the power of monitoring surveys to detect temporal trends in fish community metrics   总被引：3，自引：8，他引：3  

Nicholson  Mike D; Jennings  Simon 《ICES Journal of Marine Science》2004,61(1):35-42

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