22,125 research outputs found
The Changing Contexts of Family Care in Canada
Over the past 20 to 30 years, the importance of families as providers of assistance to older Canadians has been well documented through research. However, over these decades, the contexts within which families exist and provide support have changed considerably. This paper examines changes over this time period which affect family support to older adults. Specific areas examined include: likelihood of having a parent alive; living arrangements; divorce and single-parenthood; women's labour force participation, and combining employment and care of older relatives. The paper concludes with an assessment of policy changes in health and long-term care as these affect older Canadians and their families.family care; older population; policy change
Natural Density of Rectangular Unimodular Integer Matrices
In this paper, we compute the natural density of the set of k x n integer
matrices that can be extended to an invertible n x n matrix over the integers.
As a corollary, we find the density of rectangular matrices with Hermite normal
form [O Id]. Connections with Cesaro's Theorem on the density of coprime
integers and Quillen-Suslin's Theorem are also presented.Comment: 8 page
Public Key Cryptography based on Semigroup Actions
A generalization of the original Diffie-Hellman key exchange in
found a new depth when Miller and Koblitz suggested that such a protocol could
be used with the group over an elliptic curve. In this paper, we propose a
further vast generalization where abelian semigroups act on finite sets. We
define a Diffie-Hellman key exchange in this setting and we illustrate how to
build interesting semigroup actions using finite (simple) semirings. The
practicality of the proposed extensions rely on the orbit sizes of the
semigroup actions and at this point it is an open question how to compute the
sizes of these orbits in general and also if there exists a square root attack
in general. In Section 2 a concrete practical semigroup action built from
simple semirings is presented. It will require further research to analyse this
system.Comment: 20 pages. To appear in Advances in Mathematics of Communication
Simple non-destructive tests for electroexplosive devices
Electrothermal behavior of bridgewire-explosive interface is defined by pulsing electroexplosive device with a safe level of current and examining the resistance variation of bridgewire. Bridgewire provides signal which describes average wire temperature and heat sinking to the explosive and enclosure
Degree of the generalized Pl\"ucker embedding of a Quot scheme and Quantum cohomology
We compute the degree of the generalized Pl\"ucker embedding of a
Quot scheme over \PP^1. The space can also be considered as a
compactification of the space of algebraic maps of a fixed degree from \PP^1
to the Grassmanian . Then the degree of the embedded variety
can be interpreted as an intersection product of pullbacks of
cohomology classes from through the map that evaluates
a map from \PP^1 at a point x\in \PP^1. We show that our formula for the
degree verifies the formula for these intersection products predicted by
physicists through Quantum cohomology~\cite{va92}~\cite{in91}~\cite{wi94}. We
arrive at the degree by proving a version of the classical Pieri's formula on
the variety , using a cell decomposition of a space that lies in between
and .Comment: 18 pages, Latex documen
Families as Care-Providers versus Care-Managers? Gender and Type of Care in a Sample of Employed Canadians
This article extends previous research by examining care management as a distinct type of informal care. Using data drawn from a large Canadian study of work and family, the research is based on a study of a sub-sample of women (1068) and men (805) who were employed full-time and who had provided help to an elderly relative during the six month period preceding the interview. Results indicate that managerial care is a meaningful construct that denotes a distinct type of care. Most commonly, individuals combine managerial care with other types of assistance. Managerial care is a very common activity among caregivers and usually involves aspects of care other than arranging for formal services. Managerial care has an adverse impact on job costs and personal costs, and, among women, is associated with greater stress.elderly; caregiving
Dryland pasture and crop conditions as seen by HCMM
The author has identified the following significant results. The soil moisture difference between the flight lines was partly due to water-holding capacity differences of the two soil types. Fields along the east flight line were in clay; while along the west flight line, the soil was sandy loam which holds less moisture. Due to differences in the amount of green material, the pastures were wetter than the wheat fields. Most of the pastures average from 40-80% green material, while wheat averages from 90-100% green material. A large amount of green material transpired more water and depleted the soil water content faster than dead vegetation. Visicorder data found temperature differences between the rangeland and winter wheat fields. Pasture had a larger percentage of dead material with different thermal properties than live vegetation, and surface temperature was primarily dependent on insolation. Dead material transpired less, but warms up faster than wheat fields
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