2,585 research outputs found
Economic Opportunity, Multiculturalism, and the Roots of Popular Support for High Immigration in Canada
The Institutional Framework of Ethnic Inclusion and Exclusion: A Cross-National Analysis of the Earnings of Foreigners in Germany and Immigrants in Canada
The European social-welfare model differs from the North American individualistic model in the patterns, more than the overall extent, of ethnic inclusion and exclusion. Focussing on foreigners in Germany and immigrants in Canada as illustrative cases, conventional earnings decomposition analysis is extended cross-nationally to highlight institutional effects, using the German Socio-Economic Panel (GSOEP) first wave for 1984, and the 1986 Canadian Census. German education and labor market institutions benefit low-skill migrants, but generate less earnings assimilation. Such assimilation in Canada is greater but varies more by ethnic and racial origins. Institutional frameworks may generate social imperatives shaping patterns of ethnic inclusion and exclusion, quite apart from national policies of citizenship or culture.
Thermoluminescence fading studies: Implications for long-duration space measurements in Low Earth Orbit
Within a 1.5 year comprehensive fading experiment several batches of
LiF:Mg,Ti and LiF:Mg,Cu,P thermoluminescence detectors (TLDs) were studied. The
TLDs originated from two manufacturers and were processed by three laboratories
using different annealing and readout conditions. The TLDs were irradiated with
two radiation modalities (gamma-rays and thermal neutrons) and were stored at
two temperatures (-17.4C and +18.5C). The goal of the experiment was to verify
the stability of TLDs in the context of their application in long-term
measurements in space. The results revealed that the response of all TLDs is
stable within 10% for the studied temperature range. No influence of the
radiation type was found. These results indicate that for the properly
oven-annealed LiF TLDs, fading is not a significant problem, even for measuring
periods longer than a year
Policy Brief No. 14 - The Underutilization of Immigrant Skills: Trends and Policy Issues
Since 1996, the problem of underutilization of immigrant skills in Canada has grown significantly. University-educated immigrants are more numerous, yet our census analysis shows that their access to skilled occupations in the professions and management declined between 1996 and 2006. In these years, the value of work lost to the Canadian economy from immigrant skill underutilization grew from about 11.37 billion, annually. Given the significance of immigration for economic development, the evaluation of current policies and consideration of future directions seem urgent
Research Brief No. 9 - Racial Minority Immigrant Offspring Successes in the United States, Canada, and Australia
How well-off are second-generation immigrants in the US, Canada, and Australia? In this study, we examine the successes of immigrant offspring as compared to the respective mainstream populations (third- and higher-generation whites). We also ask whether cross-national differences in the successes of immigrants carry over to their children. We discover that the educational, occupational, and income achievements of second-generation immigrants are very similar for several ethnic groups across these countries. Each country shows common patterns of high achievement for the Chinese and South Asian second generation, less for those of other Asian origins, and still less for Afro-Caribbean blacks
Simulations of MATROSHKA experiments at ISS using PHITS
Concerns about the biological effects of space radiation are increasing rapidly due to the perspective of long-duration manned missions, both in relation to the International Space Station (ISS) and to manned interplanetary missions to Moon and Mars in the future. As a preparation for these long duration space missions it is important to ensure an excellent capability to evaluate the impact of space radiation on human health in order to secure the safety of the astronauts/cosmonauts and minimize their risks. It is therefore necessary to measure the radiation load on the personnel both inside and outside the space vehicles and certify that organ and tissue equivalent doses can be simulated as accurate as possible. In this paper we will present simulations using the three-dimensional Monte Carlo Particle and Heavy Ion Transport code System (PHITS) of long term dose measurements performed with the ESA supported experiment MATROSHKA (MTR), which is an anthropomorphic phantom containing over 6000 radiation detectors, mimicking a human head and torso. The MTR experiment, led by the German Aerospace Center (DLR), was launched in January 2004 and has measured the absorbed dose from space radiation both inside and outside the ISS. In this paper preliminary comparisons of measurements outside the ISS will be presented. The results confirm previous calculations and measurements which indicate that PHITS is a suitable tool for estimations of dose received from cosmic radiation and when performing shielding design studies of spacecraft
The ALTCRISS project on board the International Space Station
The Altcriss project aims to perform a long term survey of the radiation
environment on board the International Space Station. Measurements are being
performed with active and passive devices in different locations and
orientations of the Russian segment of the station. The goal is to perform a
detailed evaluation of the differences in particle fluence and nuclear
composition due to different shielding material and attitude of the station.
The Sileye-3/Alteino detector is used to identify nuclei up to Iron in the
energy range above 60 MeV/n. Several passive dosimeters (TLDs, CR39) are also
placed in the same location of Sileye-3 detector. Polyethylene shielding is
periodically interposed in front of the detectors to evaluate the effectiveness
of shielding on the nuclear component of the cosmic radiation. The project was
submitted to ESA in reply to the AO in the Life and Physical Science of 2004
and data taking began in December 2005. Dosimeters and data cards are rotated
every six months: up to now three launches of dosimeters and data cards have
been performed and have been returned with the end of expedition 12 and 13.Comment: Accepted for publication on Advances in Space Research
http://dx.doi.org/10.1016/j.asr.2007.04.03
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