A gender analysis of quality of life in Saskatoon, Saskatchewan     

Heather Dunning  Bonnie Janzen  Allison Williams  Sylvia Abonyi  Bonnie Jeffery  J. E. Randall  Bill Holden  Ronald Labonte  Nazeem Muhajarine  Gerry Klein  Tracey Carr 《GeoJournal》2006,65(4):393-407

While many community initiatives have attempted to assess the nature and determinants of their citizens’ quality of life (QOL), these initiatives have produced little about whether the key determinants of life quality differ by gender. Using both quantitative and qualitative data from a recent QOL research project in Saskatoon, Saskatchewan, Canada, this study explores whether factors that predict poor QOL are similar for women and men. The study also examines whether the nature of these gender differences varies across low, medium and high socio-economic status locales. Results showed that men and women were very similar in: (1) their QOL ratings, (2) reports of deterioration in neighborhood QOL, and (3) rating particular aspects of their neighborhood. Few gender differences were also found when analyzing data referring to place characteristics and social cohesion. Multivariate analysis revealed further similarities: (1) being divorced/widowed was a significant predictor of poor QOL, and (2) a negative view of community security issues was associated with deterioration in perceived neighborhood quality of life. For women, however, other variables were important predictors of QOL: being middle aged, being single, and having a poor opinion of the overall quality of their neighborhood. Qualitative analysis revealed that while men and women shared concern about general areas such as safety and neighborhood supports, their perceptions of the details around these issues differed. The multi-method results suggest that urban policy actions should include a gendered discussion of common QOL issues.  相似文献   

Finding the repeat times of the GPS constellation   总被引：5，自引：6，他引：5  

Duncan Carr Agnew  Kristine M. Larson 《GPS Solutions》2007,11(1):71-76

Single-epoch estimates of position using GPS are improved by removing multipath signals, which repeat when the GPS constellation does. We present two programs for finding this repeat time, one using the orbital period and the other the topocentric positions of the satellites. Both methods show that the repeat time is variable across the constellation, at the few-second level for most satellites, but with a few showing much different values. The repeat time for topocentric positions, which we term the aspect repeat time, averages 247 s less than a day, with fluctuations through the day that may be as much as 2.5 s at high latitudes.  相似文献   

Increasing frequency of extreme fire weather in Canada with climate change     

Xianli Wang  Dan K. Thompson  Ginny A. Marshall  Cordy Tymstra  Richard Carr  Mike D. Flannigan 《Climatic change》2015,130(4):573-586

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A LA-ICP-MS Comparison of Reference Materials Used in Cassiterite U-Pb Geochronology     

Patrick A. Carr  Emeline Moreira  Leonid Neymark  Marc D. Norman  Julien Mercadier 《Geostandards and Geoanalytical Research》2023,47(1):67-87

Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) is used to compare the suitability of four cassiterite (SnO₂) materials (SPG, Yankee, AY-4 and Jian-1), and three matrix-mismatched reference materials (NIST SRM 612, NIST SRM 614 and 91500 zircon) for normalisation of U-Pb and Pb-Pb isotope ratios in cassiterite. The excess variance of ages determined by LA-ICP-MS is estimated to be ±0.33% for ²⁰⁷Pb/²⁰⁶Pb vs. ²⁰⁸Pb/²⁰⁶Pb isochron ages and ± 1.8% and for U-Pb ages. Incorporation of this excess variance in cassiterite ages is necessary for realistic uncertainties. ²⁰⁷Pb-²⁰⁶Pb ages are advantageous for dating Precambrian cassiterite such as SPG compared with U-Pb ages as matrix effect on instrumental mass fractionation of Pb isotopes are generally considered to be minor. We note minor bias in ²⁰⁷Pb/²⁰⁶Pb vs. ²⁰⁸Pb/²⁰⁶Pb isochron ages (~ 0.6%) when using either the NIST SRM 614 or 91500 zircon reference materials and emphasise the requirement for uncertainty propagation of all sources of error and reference materials with comparable U and Pb mass fraction to the cassiterite. The ²³⁸U/²⁰⁶Pb isotopic ratios from normalisation to matrix-mismatched reference materials show varied results, which emphasises the need to use matrix-matched reference materials for calculating U-Pb ages. When cross-calibrated against each other, LA-ICP-MS U-Pb ages of the ca. 1535 Ma SPG, ca. 245 Ma Yankee and ca. 155 Ma Jian-1 cassiterites are all consistent with their ID-TIMS values.  相似文献   

Acute toxicity of a used chrome lignosulphonate drilling mud to several species of marine invertebrate     

J. M. Neff  R. S. Carr  W. L. McCulloch 《Marine environmental research》1981,4(4)

The acute toxicity of a used seawater chrome lignosulphonate drilling mud to several species of marine annelids, crustaceans and molluscs was evaluated. The medium density mud (13·4 lb/gal, 1·57 kg/litre) was composed primarily of seawater, bentonite clay, chrome lignosulphonate, lignite, sodium hydroxide and barium sulphate. The toxicity of four mud/seawater preparations was determined. These were the layered solids phase (LSP), the suspended solids phase (SSP), the unfiltered mud aqueous fraction (MAF) and the filtered mud aqueous fraction (FMAF). Four species each of marine annelids and bivalve molluscs and five species of marine crustaceans were evaluated. The median lethal concentration of the MAF (96-h LC₅₀) varied from 32 to > 100% MAF for the different species. The FMAF was slightly less toxic than the MAF. Adult polychaetes, Neanthes arenaceodentata and Ctenodrilus serratus, one-day old juveniles of opossum shrimp, Mysidopsis almyra, and four day zoeae of grass shrimp, Palaemonetes pugio, were the most sensitive to the MAF. Juvenile N. arenaceodentata, adult polychaetes, Ophryotrocha labronica, and three bivalve molluscs were highly tolerant to the MAF. The SSP preparation at concentrations of 10-20 ml/litre was toxic to post-larvae and juveniles of the commercial shrimp, Penaeus duorarum and P. aztecus, respectively. Exposure to the LSP preparation caused greater than 50% mortality amongst adult N. arenaceodentata, juvenile and adult coquina clams, Donax variabilis texasiana and adult scallops, Aequipecten amplicostatus. Other species tested were quite tolerant. A sublethal response observed was the inhibition of reproduction in the marine annelids, Dinophilus sp. and Ctenodrilus serratus. Toxicity of the mud aqueous fractions appeared to be due primarily to volatile soluble organic materials in the extract, whilst that of the SSP and LSP preparations appeared to be due to the smothering action of fine particulates in the mud. Based on the results of this investigation and published observations of solids concentrations in the water column during drilling mud discharge, it is concluded that discharge of a used chrome lignosulphonate drilling mud, such as that used in the present investigation, from offshore platforms is not likely to cause measureable damage to benthic, demersal or pelagic marine animals.  相似文献   

The occurrence and spawning of cultured Atlantic salmon (Salmo salar) in a Canadian river     

Carr  J. W.; Anderson  J. M.; Whoriskey  F. G.; Dilworth  T. 《ICES Journal of Marine Science》1997,54(6):1064-1073

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Field assessment of biochemical stress indices for the sandworm Neanthes virens (Sars)     

Robert Scott Carr  Jerry M. Neff 《Marine environmental research》1984,14(1-4)

Certain biochemical stress responses have been observed in the laboratory for Neathhes virens subjected to various environmental and pollutant stressors. The purpose of the present study was to determine whether similar alterations in these biochemical parameters could be detected in a natural population of N. virens from a contaminated site as compared with animals from a nearby reference site. A site in Portland Harbor, Maine, adjacent to an oil storage facility with oil-contaminated sediments was selected as the experimental study area and the reference site was at Pine Point, approximately 15 miles south of Portland.Animals were collected from the two sites on consecutive days on a bimonthly basis at low tide within a day of the full moon from September 1981 through March 1982. Coelomic fluid samples were taken within 2 h after collection and the animals were then frozen in liquid nitrogen for transport back to the laboratory. Coelomic fluid samples were analyzed for glucose and the frozen tissues were analyzed for glycogen, lipid and free amino acid concentrations.Significant differences in these parameters were often observed between the two populations. The glycogen content of animals from the contaminated site was always less than that of animals from the reference site, whereas the lipid levels were always higher. Significant differences between the free amino acid composition of the animals from the two sites were also observed. Although distinct biochemical differences can be detected between these two populations, the considerable biological variation in these parameters may limit their usefulness for field monitoring investigations for this species.  相似文献   

The escape of juvenile farmed Atlantic salmon from hatcheries into freshwater streams in New Brunswick, Canada   总被引：1，自引：0，他引：1  

Carr  Jonathan W.; Whoriskey  Frederick G. 《ICES Journal of Marine Science》2006,63(7):1263-1268

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Global civil society? The Johannesburg World Summit on Sustainable Development     

D.L. Carr  Emma S. Norman 《Geoforum》2008,39(1):358-371

In the face of mounting environmental degradation and persistent poverty over the previous decade, Johannesburg’s World Summit on Sustainable Development (WSSD) of August and September 2002 inherited a number of unmet accords from the 1992 Rio de Janeiro Earth Summit. Consequently, the United Nations Stakeholder Forum Implementation Conference (IC) was convened to integrate civil society stakeholders into global deliberations on sustainable development and to marshal their forces in the implementation of WSSD accords. Given the importance of the IC as the first civil society forum at a major global summit on environment and poverty, intriguing questions emerge as to its effectiveness in achieving civil society objectives. As a first attempt in exploring this topic, we examine three fundamental aspects of the IC. Specifically, we examine the relative “civility” of the IC forum in terms of (a) fidelity of representation of the community of global environment and development stakeholders; (b) autonomy of the IC agenda from state and institutional interests; and (c) interpretations of space and place as reflected in deliberative processes and outcomes. The paper begins with a review of the civil society literature with a particular emphasis on civil society representation in UN meetings since Rio. The paper concludes with a discussion of IC participation at the Johannesburg summit, and considers implications for future civil society participation in global decision-making forums.  相似文献   

Response to Wilson, P. (2008): “Comment on Carr, S., and Coleman, C. (2007): An improved technique for the reconstruction of former glacier mass-balance and dynamics: Geomorphology 92, 76–90,” Geomorphology 99, 443–444     

Simon Carr  Chris Coleman 《Geomorphology》2009,106(3-4):383-384

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