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111.
112.
Ozone concentrations exhibit spatial variability within metropolitan areas, resulting in significantly different personal exposures among individuals. This paper uses the statistical technique, kriging, to explore the 12-h daytime (8am–8pm) ozone spatial variation and to predict mean outdoor ozone levels at home sites within the Toronto metropolitan area. Outdoor ozone measurements taken in the Toronto metropolitan area between June and August 1992 are used in kriging models to predict outdoor ozone concentrations. The performance of the model is evaluated by comparing actual home outdoor measurements with predicted values. Results indicate that kriging predictions are more accurate than using only the closest stationary ambient site measurements for determining home outdoor ozone concentrations within the metropolitan area. The average variogram obtained from pooling data throughout the entire sampling period shows a clear spatial trend in the outdoor ozone variation. Kriging predictions using the parameters from the average variogram perform as well as those using variograms from individual days. An approach for minimizing sample bias can be used to increase the accuracy of the predictions; cross-validation suggests that it is a reasonable procedure. 相似文献
113.
Since the 1970s, there has been a global proliferation of environmental courses. The types of courses are described, as are the structures, philosophies and objectives of courses which have stood the test of time. Employment of environmental graduates is discussed. The degree in Australian Environmental Studies (AES) from Griffith University is described and discussed with reference to pitfalls described in the literature. In Australia, there has been an increased demand for graduates in the environmental area. The trend in employers has been widening the field of potential recruits by keeping the degree specification broad and using the duty statements in the advertisements to specify the environmental skills and knowledge required. The number of graduates from AES has increased steadily since the course was established, and despite global and national trends of proliferation of environmental courses and graduates, survey results indicated that graduates from AES are professionally employed in a wide range of employment sectors, with female and male graduates being equally successful in obtaining employment. 相似文献
114.
Risk assessments are fast becoming an indispensable tool for both government and industry. Unfortunately, organizations required to perform risk assessments often lack the ability to either generate or critically evaluate the quality of risk assessment reports and must rely on contractors to tell them what they need and whether they have received it. The authors advocate a proactive approach to contractual risk assessment management in which a client team directs the production of the report and maintains quality control at each step in the process. 相似文献
115.
Sally A. McConkey Krishan P. Singh 《Journal of the American Water Resources Association》1992,28(2):305-313
ABSTRACT: Along a drainage network, there is a systematic variation of average flow parameters (width, depth, and velocity) at flows having the same flow duration. Hydraulic geometry equations mathematically express this interdependent relationship of stream-flow characteristics for a basin for annual flow durations varying from 10 to 90 percent. However, the equations proposed so far have had rather poor predictive performance for low flows. An independent investigation of the variation of discharge with drainage area and annual flow duration demonstrates a consistent relationship between these parameters. The relationship for the high to median-flow range differs, however, from that for the median— to low-flow range. The proposed equations provide a better predictive performance for low flows than previous formulations and a versatile means of estimating flow parameters for streams throughout a basin. The improved basin hydraulic geometry equations have a wide range of applications in areas such as stream habitat assessment, water quality modeling, channel design, and stream restoration projects. 相似文献
116.
117.
M C Croteau V E Renner F Archibald V S Langlois J Cahn J Ridal V L Trudeau D R S Lean 《Water environment research》2007,79(9):1050-1056
Biosolids produced from pulp and paper mill wastewater treatment have excellent properties as soil conditioners, but often contain high levels of Escherichia coli. E. coli are commonly used as indicators of fecal contamination and health hazard; therefore, their presence in biosolids causes concern and has lead to restrictions in land-spreading. The objectives of this study were to determine the following: (1) if E. coli from the biosolids of a wastewater-free pulp and paper mill were enteric pathogens, and (2) if other waterborne microbial pathogens were present. E. coli were screened for heat-labile and heat-stable enterotoxin and verocytotoxin virulence genes using a polymerase chain reaction. Ten isolates were also screened for invasion-associated locus and invasion plasmid antigen H genes. None of the 120 isolates carried these genes. Tests for seven other microbial pathogens were negative. Effluents and biosolids from this mill do not contain common microbial pathogens and are unlikely to pose a health hazard. 相似文献
118.
A glasshouse pot experiment was conducted to investigate the effect of the fungicide chlorothalonil on the growth of upland rice, in the absence or presence of the arbuscular mycorrhizal fungus (AMF) Glomus mosseae (NM and GM treatments). The plants were grown with three concentrations of chlorothalonil (0, 50 and 100 mg kg(-1) soil). Mycorrhizal colonization decreased significantly with increasing chlorothalonil concentrations. Plant biomass decreases were smaller in GM plants than in non-mycorrhizal (NM) plants. Mycorrhizal dependency was the highest with 50 mg kg(-1) chlorothalonil. Chlorothalonil affected physiological processes in upland rice irrespective of inoculation. Chlorothalonil at 50 and 100 mg kg(-1) increased ascorbate peroxidase (APX) activity and soluble protein concentrations in shoots and roots of NM upland rice. However, values of APX, catalase (CAT) and peroxidase (POD) were reduced more in GM plants than in NM plants. These results showed that chlorothalonil induced oxidative stress in upland rice and it is needed to evaluate the side effects of chlorothalonil on rice and AMF. 相似文献
119.
Sally Dunbar 《Disasters》1984,8(3):174-177
In a long term Somali refugee camp where nutritional and general health status of children is now considered satisfactory and stable, a randomized community based survey of 300 children under five years was undertaken. Results indicate that the prevalence of protein-energy malnutrition is rising again: 17.3% of children are <80% median weight/height and 1.7% are <70%median weight/height. In addition, there is a high prevalence of anaemia: 50.5% have a haemoglobin level <9g% and 10.8%≤6g%. This cannot be explained by chronic malaria as the spleen rate is only 2%. Stool examination of 161 children show 29.8% to have evidence of Giardia Lamblia infection but this is not statistically correlated with either anaemia or with protein-energy malnutrition. Other potentially pathogenic parasites are uncommon and no hookworm is seen. Examination of blood films of anaemic children shows hypochromia as a striking feature.
It is concluded that nutritional deficiencies are a likely major factor in the aetiology of the anaemia. Both protein-energy malnutrition and anaemia seem related to the weaning period. Food rations for refugees, although adequate for short term needs, may be qualitatively deficient for long term subsistence, especially as regards young children. 相似文献
It is concluded that nutritional deficiencies are a likely major factor in the aetiology of the anaemia. Both protein-energy malnutrition and anaemia seem related to the weaning period. Food rations for refugees, although adequate for short term needs, may be qualitatively deficient for long term subsistence, especially as regards young children. 相似文献
120.
Residential mobility and personal well-being 总被引:1,自引:0,他引:1
This research examines the relationship between personal mobility rate (number of lifetime moves/respondent's age) and health status. A contextual analysis is proposed in which the health consequences of relocation depend not only on the immediate circumstances surrounding a move, but also on the broader context of the individual's residential history, current life situation, and aspirations for the future. Two hundred and forty-two adult employees completed an initial survey of lifetime residential history, current residential desirability, employment experience, and perceived housing options for the future. Three months later, a panel group of 121 respondents completed a follow-up survey of emotional and physical well-being. Frequent relocation was directly associated with a greater number of illness-related symptoms, but the impact of mobility rate was largely mediated by psychological factors. Health problems were more prevalent among high-mobility individuals characterized by low rather than high levels of environmental exploratory tendency; among low-mobility persons reporting low versus high levels of residential choice and congruence; and among low residential-quality individuals who perceived future residential options to be unavailable rather than available. 相似文献