Browsing Faculty of Science by Issue Date
Now showing items 1-20 of 209
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Rings with involution whose symmetric elements are central
(1980-1-1)In a ring R with involution whose symmetric elements S are central, the skew-symmetric elements K form a Lie algebra over the commutative ring S. The classification of such rings which are 2-torsion free is equivalent to ... -
Spline solutions for nonlinear two point boundary value problems
(1980-1-1)Necessary formulas are developed for obtaining cubic, quartic, quintic, and sextic spline solutions of nonlinear boundary value problems. These methods enable us to approximate the solution of the boundary value problems, ... -
Longitudinal dispersion of tracer particles in a channel bounded by Porous media using slip condition
(1984-1-1)Longitudinal dispersion of solute in a channel bounded by porous layers is studied using the analysis of Taylor [4] with BJ slip condition. The results of the present analysis are compared with those of Fung and Tang [2] ... -
Numerical methods for approximating eigenvalues of boundary value problems
(1986-1-1)This paper describes some new finite difference methods for the approximation of eigenvalues of a two point boundary value problem associated with a fourth order linear differential equation of the type (py″)′′−(qy′)′+(r−λs)y=0. ... -
Finite difference methods for computing eigenvalues of fourth order boundary value problems
(1986-1-1)This brief report describes some new finite difference methods of order 2 and 4 for computing eigenvalues of a two point boundary value problem associated with a fourth order linear differential equation y(4)+(p(x)−λq(x))y=0. ... -
Two new finite difference methods for computing eigenvalues of a fourth order linear boundary value problem
(1987-1-1)This paper describes some new finite difference methods of order 2 and 4 for computing eigenvalues of a two-point boundary value problem associated with a fourth order differential equation of the form (py″)′′+(q−λr)y=0. ... -
Play-the-winner rule and adaptive designs of clinical trials
(2000-1-1)In another paper, we have argued that the traditional randomized design of clinical trials is ethically infeasible in desperate medical situations and adaptive designs are morally required. We have also argued that in such ... -
Toeplitz operators with BMO symbols and the Berezin transform
(2002-1-1)We prove that the boundedness and compactness of the Toeplitz operator on the Bergman space with a BMO1 symbol is completely determined by the boundary behaviour of its Berezin transform. This result extends the known ... -
A New Mathematical Model for Assessing Therapeutic Strategies for HIV Infection
(2002-1-1)The requirements for the eradication of HIV in infected individuals are unknown. Intermittent administration of the immune activator interleukin-2 (IL-2) in combination with highly-active antiretroviral therapy (HAART) has ... -
Could Condoms Stop the AIDS Epidemic?
(2003-1-1)Although therapeutic treatment strategies appear promising for retarding the progression of HIV-related diseases, prevention remains the most effective strategy against the HIV/AIDS epidemic. This paper focuses on the ... -
Long-term trends in spring arrival dates of migrant birds at Delta Marsh, Manitoba, in relation to climate change
(2005-10-31)We examined a 63-year data set of dates of first spring sightings for 96 species of migrant birds at Delta Marsh, Manitoba, and considered the influence of local climate change on those arrival dates. Mean monthly spring ... -
Recent developments in volatility modeling and applications
(2006-11-30)In financial modeling, it has been constantly pointed out that volatility clustering and conditional nonnormality induced leptokurtosis observed in high frequency data. Financial time series data are not adequately modeled ... -
The Creatine Kinase/Creatine Connection to Alzheimer's Disease: CK Inactivation, APP-CK Complexes and Focal Creatine Deposits
(2006-4-4)Cytosolic brain-type creatine kinase (BB-CK), which is coexpressed with ubiquitous mitochondrial uMtCK, is significantly inactivated by oxidation, in Alzheimer's disease (AD) patients. Since CK has been shown to play a ... -
Color variation among nestling brown-headed cowbirds (Molothrus Ater) does not reflect differential success with hosts in Texas
(2007-04-30)As brood parasites, nestling Brown-headed Cowbirds (Molothrus ater) may exhibit characters that improve their fledging success when reared alongside host young. The coloration of mouthparts of nestlings can influence adult ... -
Sensing with One or with Four? A Comparison of Two IEEE 802.15.x Protocols for Use in Sensor Networks
(2007-1-1)In this paper we compare the pertinent features of the two emerging technologies for wireless sensor networks: IEEE Standards 802.15.1 and 802.15.4. We review the main features of the MAC protocols defined by those standards, ... -
Analysis of Cluster Interconnection Schemes in 802.15.4 Beacon Enabled Networks
(2008-1-1)In this paper, we consider the interconnection of IEEE 802.15.4 beacon enabled network clusters. We discuss two types of interconnections. One type can be achieved by using the PAN coordinator node as the bridging device ... -
Mathematical Assessment of Canada’s Pandemic Influenza Preparedness Plan
(2008-1-1)OBJECTIVE: The presence of the highly pathogenic avian H5N1 virus in wild bird populations in several regions of the world, together with recurrent cases of H5N1 influenza arising primarily from direct contact with poultry, ... -
Delay Analysis of GTS Bridging between IEEE 802.15.4 and IEEE 802.11 Networks for Healthcare Applications
(2008-12-2)We consider interconnection of IEEE 802.15.4 beacon-enabled network cluster with IEEE 802.11b network. This scenario is important in healthcare applications where IEEE 802.15.4 nodes comprise patient's body area network ... -
The Manitoba IBD Index: Evidence for a New and Simple Indicator of IBD Activity
(American Journal Gastroenterology, 2009-07)OBJECTIVES: A single-item indicator of disease activity over an extended period of time, the Manitoba Inflammatory Bowel Disease Index (MIBDI), is introduced and compared against several standard measures for assessing ... -
Improving Sensing Accuracy in Cognitive PANs through Modulation of Sensing Probability
(2009-1-1)Cognitive radio technology necessitates accurate and timely sensing of primary users' activity on the chosen set of channels. The simplest selection procedure is a simple random choice of channels to be sensed, but the ...