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51.
This paper offers a way of identifying fruitful research avenues through the maze of possibilities existing in the field of occupational stress. The field appears to be at a crossroads in which key choices will have to be made in the 1980s. The choices involve: How should we study stress? Who do we want to study? And what problems should we study? Central methodological challenges include: highlighting the relative value of various methods with respect to the level of explanation and the nature of the audience; examining the meaning and phenomenology of the stress experience; and evaluating the validity of measures in the hope of standardizing diagnostic instruments. Regarding research populations, more care must be devoted to selection of subjects. Subjects who are strained should be selected noting whether the state is acute versus chronic. Researchers should concentrate on blue collar jobs which are demanding but of low discretion; the long term unemployed; chronically threatened job incumbents; the wives of men who are themselves in stressful occupations; women in professional and executive roles; the wives of the unemployed; and single parent families in general. Stress problems worthy of study include: acute versus chronic states of stress; the role of the objective and subjective environment; the relationship between psychological strain and physiological mechanisms; coping behaviours; and the work, family and societal interface. The quality of knowledge of about each of these elements needs to be improved if we are to achieve a more comprehensive analysis of the stress process. 相似文献
52.
Photosensitized by poly (sodium styrenesulfonate-co-2-vinylnaphthalene) (PSSS-VN) oxidation of cyanide in an aqueous solution was studied. The reaction was found to occur via photoinduced electron transfer from CN- to the polymeric chromophores. The process leads to formation of NCO-. 相似文献
53.
Rutta E Williams H Mwansasu A Mung'ong'o F Burke H Gongo R Veneranda R Qassim M 《Disasters》2005,29(4):291-309
This article describes the findings of a participatory assessment of Burundian and Rwandan refugees' perceptions of the quality of health services in camps in Ngara, Tanzania. Taking a beneficiary-centred approach, it examines a collaborative effort by several agencies to develop a generic field guide to analyse refugees' views of healthcare services. The objective was to gather information that would contribute to significant improvements in the care offered in the camps. Although the primary focus was on healthcare, several broader questions considered other general apprehensions that might influence the way refugees perceive their healthcare. Findings indicated that while refugees in Ngara were generally satisfied with the quality of healthcare provided and healthcare promotion activities, recognition of some key refugee concerns would assist healthcare providers in enhancing services. With increasing need for refugee community participation in evaluating humanitarian assistance, this assessment has relevance both in the context of Ngara and beyond. 相似文献
54.
Edward P. Hardy Herbert L. Volchok Hugh D. Livingston John C. Burke 《Environment international》1980,4(1):21-30
A sediment core from a lake downwind of the Rocky Flats Plant, where nuclear weapons components are produced, was used to reconstruct a time pattern of off-site plutonium deposition. Core sections were dated by analyses of 137Cs, 239,240Pu, 238Pu, and 241Am fallout from nuclear testing and 238Pu fallout from a satellite failure. A peak in transuranic concentrations occurred in late 1969 which was attributable to the Plant. This was confirmed by mass isotopic analysis of plutonium isotopes in selected core segments where the global fallout and Plant contributions could be differentiated. The 18 nCi 239,240Pu per m2 from the Plant that had accumulated in the sediment is reasonable when compared to soil analyses. 相似文献
55.
Sand dunes are complex systems that contain several habitats, often as mosaics or transitions between types. Several of these habitats are afforded protection under European Legislation and in the UK nationally within Special Areas of Conservation (SAC) and Sites of Special Scientific Interest (SSSI). Natural England has a statutory duty to report to Europe on the conservation status and condition of sand dunes; and is required to report to the UK Government on designated sites. To achieve this we have sought ways of capturing, analysing and interpreting data on the extent and location of sand dune habitats. This requires an ability to be able to obtain data over large areas of coastline in an efficient way. Natural England and Environment Agency Geomatics have worked collaboratively for over 16 years, sharing data and ecological knowledge. In 2012 work started to evaluate the use of remote sensing to map UK BAP and Annex I sand dune habitats. A methodology has now been developed and tested to map sand dune habitats. The key objective was to provide an operational tool that will help to map these habitats and understand change on sites around England. This has been achieved through analysis of LIDAR and Compact Airborne Spectrographic Imager (CASI) data using Object Orientated Image Analysis. Quality Control (QC) and accuracy assessments have shown this approach to be successful and 11 sites have been mapped to date. These techniques are providing a new approach to monitoring change in coastal vegetation communities and informing management of protected sites. 相似文献
56.
River systems have been altered worldwide by dams and diversions, resulting in a broad array of environmental impacts. The use of a process-based, hierarchical framework for assessing environmental impacts of dams is explored here in terms of a case study of the Kootenai River, western North America. The goal of the case study is to isolate and quantify the relative effects of multiple dams and other river management activities within the study area and to inform potential restoration strategies. In our analysis, first-order impacts describe broad changes in hydrology (determined from local stream gages), second-order impacts quantify resultant changes in channel hydraulics and bed mobility (predicted from a 1D flow model), and third-order impacts describe consequences for recruitment of riparian trees (recruitment box analysis). The study area is a 233km reach bounded by two dams (Libby and Corra Linn). Different times of dam emplacement (1974 and 1938, respectively) allow separation of their relative impacts. Results show significant changes in 1) the timing, magnitude, frequency, duration and rate of change of flows, 2) the spatial and temporal patterns of daily stage fluctuation, unit stream power, shear stress, and bed mobility, and 3) the potential for cottonwood recruitment (Populus spp.). We find that Libby Dam is responsible for the majority of first and second-order impacts, but that both dams diminish cottonwood recruitment; operation of Corra Linn adversely affects recruitment in the lower portion of the study reach by increasing stage recession rates during the seedling establishment period, while operation of Libby Dam affects recruitment in the middle and upper portions of the study reach by changing the timing, magnitude, and duration of flow. We also find that recent experimental flow releases initiated in the 1990s to stimulate recovery of endangered native fish may have fortuitous positive effects on cottonwood recruitment potential in the lower portion of the river. This case study demonstrates how a process-based, hierarchical framework can be used for quantifying environmental impacts of dam operation over space and time, and provides an approach for evaluating alternative management strategies. 相似文献
57.
The buffalo weavers, Bubalornis spp., are unique amongst birds in possessing a phalloid organ, a phallus-like structure anterior to the cloaca. We studied the red-billed buffalo weaver Bubalornis niger, to determine whether the phalloid organ has evolved in response to sperm competition. The phalloid organ was significantly longer in males that were resident at nests than in non-resident males, and among resident males was significantly longer in those males with a harem than in those without. Red-billed buffalo weavers bred colonially and had either a cooperatively polygynandrous (usually two unrelated males and several females) or a polygynous (one male and several females) mating system. Cooperative polygynandry provided females with the opportunity to copulate with more than one male and paternity analyses using DNA fingerprinting revealed that 63% of 16 multiple-offspring broods, comprising 43 offspring, had multiple sires, which included both nest-owning males and extra-group males. Sperm competition was therefore intense. Observations and experiments with buffalo weavers in captivity revealed that the phalloid organ was not intromittent during copulation, but functioned as a stimulatory organ which necessitated protracted copulation in order to induce male 'orgasm' and ejaculation, a feature apparently unique to this species. 相似文献
58.
Objective
To evaluate CarFit, an educational program designed to promote optimal alignment of driver with vehicle.Methods
A driving activity survey was sent to 727 randomly selected participants living in retirement communities. Drivers (n = 195) were assigned randomly to CarFit intervention (n = 83, M age = 78.1) or Comparison (n = 112, M age = 79.6) groups. After 6 months, participants completed a post-test of driving activity and CarFit recommendations.Results
Nonconsenting drivers were older and participated in fewer driving activities. CarFit participation was moderate (71%) with 86% of the participants receiving recommendations. 60% followed the recommendations at the 6-month re-evaluation). The CarFit (67.6%) and Comparison (59.3%) groups reported at least one type of self-regulation of driving activity at baseline. There was no significant change in the driving behaviors at the six-month follow-up.Conclusion
CarFit was able to detect addressable opportunities that may contribute to the safety of older drivers.Impact on industry
CarFit recommendations may need stronger reinforcement in order to be enacted by a participant. 相似文献59.
Pre- and post-fire pollutant loads in an urban fringe watershed in Southern California 总被引:1,自引:0,他引:1
M. P. Burke T. S. Hogue A. M. Kinoshita J. Barco C. Wessel E. D. Stein 《Environmental monitoring and assessment》2013,185(12):10131-10145
Post-fire runoff has the potential to be a large source of contaminants to downstream areas. However, the magnitude of this effect in urban fringe watersheds adjacent to large sources of airborne contaminants is not well documented. The current study investigates the impacts of wildfire on stormwater contaminant loading from the upper Arroyo Seco watershed, burned in 2009. This watershed is adjacent to the Greater Los Angeles, CA, USA area and has not burned in over 60 years. Consequently, it acts as a sink for regional urban pollutants and presents an opportunity to study the impacts of wildfire. Pre- and post-fire storm samples were collected and analyzed for basic cations, trace metals, and total suspended solids. The loss of vegetation and changes in soil properties from the fire greatly increased the magnitude of storm runoff, resulting in sediment-laden floods carrying high concentrations of particulate-bound constituents. Post-fire concentrations and loads were up to three orders of magnitude greater than pre-fire values for many trace metals, including lead and cadmium. A shift was also observed in the timing of chemical delivery, where maximum suspended sediment, trace metal, and cation concentrations coincided with, rather than preceded, peak discharge in the post-fire runoff, amplifying the fire’s impacts on mass loading. The results emphasize the importance of sediment delivery as a primary mechanism for post-fire contaminant transport and suggest that traditional management practices that focus on treating only the early portion of storm runoff may be less effective following wildfire. We also advocate that watersheds impacted by regional urban pollutants have the potential to pose significant risk for downstream communities and ecosystems after fire. 相似文献
60.
Thomas P Good Jeremy Davies Brian J Burke Mary H Ruckelshaus 《Ecological applications》2008,18(1):246-257
Catastrophic die-offs can have important consequences for vertebrate population growth and biodiversity, but catastrophic risks are not commonly incorporated into endangered-species recovery planning. Natural (e.g., landslides, floods) and anthropogenic (e.g., toxic leaks and spills) catastrophes pose a challenge for evolutionarily significant units (ESUs) of Pacific salmon listed under the Endangered Species Act and teetering at precariously low population levels. To spread risks among Puget Sound chinook salmon populations, recovery strategies for ESU-wide viability recommend at least two viable populations of historical life-history types in each of five geographic regions. We explored the likelihood of Puget Sound chinook salmon ESU persistence by examining spatial patterns of catastrophic risk and testing ESU viability recommendations for 22 populations of the threatened Puget Sound chinook salmon ESU. We combined geospatial information about catastrophic risks and chinook salmon distribution in Puget Sound watersheds to categorize relative catastrophic risks for each population. We then analyzed similarities in risk scores among regions and compared risk distributions among strategies: (1) population groups selected using the ESU viability recommendations of having populations spread out geographically and including historical life-history diversity, and (2) population groups selected at random. Risks from individual catastrophes varied among populations, but overall risk from catastrophes was similar within geographic regions. Recovery strategies that called for two viable populations in each of five geographic regions had lower risk than random strategies; strategies that included life-history diversity had even lower risks. Geographically distributed populations have varying catastrophic-risks profiles, thus identifying and reinforcing the spatial and life-history diversity critical for populations to respond to environmental change or needed to rescue severely depleted or extirpated populations. Recovery planning can promote viability of Pacific salmon ESUs across the landscape by incorporating catastrophic risk assessments. 相似文献