Now showing items 1-20 of 59

    • Engaging Indigenous Youth in Science with the High-Altitude Balloon Experiment 

      Cheng, Stephen; Gendron, Fidji; Ziffle, Vincent; Gerhard, David (Scientific Research Publishing, 2019-02-20)
      Our custom high-altitude balloon experiment kit with the complete set of instructions has been successfully used to engage high school and post-secondary students across Canada. This article describes how the high-altitude ...
    • Incorporation of High-Altitude Balloon Experiment in High School Science Classrooms 

      Cheng, Stephen; Gerhard, David; Gendron, Fidji; Ziffle, Vincent (Scientific Research Publishing, 2019-02-14)
      We have been launching high-altitude balloons to engage students in science since 2013. Our custom balloon kit allows high school teachers and students to collect environmental data and capture videos. Through our ...
    • Winter climate affects torpor patterns and roost choice in New Zealand lesser short-tailed bats 

      Czenze, Zenon J.; Brigham, R. Mark; Hickey, Anthony J.R.; Parsons, Stuart (Wiley-Blackwell (Zoological Society of London), 2017)
      Variation in winter conditions differentially impacts thermoregulation of endotherms, with some species using torpor as an energy-saving strategy during periods of negative energy balance. We evaluated how differences ...
    • Quantifying Relative Levels of Solar Radiation at Bat Roosts Using Pyranometers 

      Bondo, Kristin J.; Brooks, David R.; Brigham, R. Mark (Wiley - The Wildlife Society, 2017)
      Although the amount of solar radiation received at roost sites used by bats has been speculated to be a factor driving roost-site selection and roost switching behavior, few studies have scientifically quantified and ...
    • Stressful summers? Torpor expression differs between high- and low-latitude populations of bats 

      Czenze, Zenon J,; Brigham, R. Mark; Hickey, Anthony J.R.; Parsons, Stuart (American Society of Mammalogists, 2017)
      Variation in weather and food availability impacts the energy budgets of endotherms, with some species using torpor as an energy-saving strategy during periods of negative energy balance. We evaluated how latitudinal differences ...
    • Home is where you hang your bat: winter roost selection by prairie-living big brown bats 

      Klug-Baerwald, Brandon J.; Lausen, Cori L.; Willis, Craig K.R.; Brigham, R. Mark. (American Society of Mammalogists, 2017)
      Information on the roost requirements of small, temperate-zone hibernating bats, which can spend up to 8 months in hibernation, is crucial to their conservation. We studied male big brown bats (Eptesicus fuscus) in ...
    • Thermoregulation by captive and free-ranging Egyptian rousette bats (Rousettus aegyptiacus) in South Africa 

      Barclay, Robert M.R.; Jacobs, David S.; Harding, Craig T.; McKechnie, Andrew E.; McCulloch, Stuart D.; Markotter, Wanda; Paweska, Janusz; Brigham, R. Mark (American Society of Mammalogists, 2017)
      Many bats, including some small-bodied tropical and subtropical Pteropodidae, use torpor to offset energetic constraints. We tested the hypothesis that medium-sized (110–160 g) cave-roosting Egyptian rousette bats (Rousettus ...
    • Hung out to dry? Intraspecific variation in water loss in a hibernating bat 

      Klug-Baerwald, Brandon J.; Brigham, R. Mark. (Springer, 2017)
      Hibernation is a period of water deficit for some small mammals, and humidity strongly influences hibernation patterns. Dry conditions reduce length of torpor bouts, stimulate arousals, and decrease overwinter survival. ...
    • Cold and alone? Roost choice and season affect torpor patterns in lesser short‑tailed bats 

      Brigham, R. Mark; HIckey, Anthony J.R.; Parsons, Stuart; Czenze, Zenon J. (Springer, 2017)
      Seasonal changes in weather and food availability differentially impact energy budgets of small mammals such as bats. While most thermal physiological research has focused on species that experience extreme seasonal ...
    • Approximation and Visualization of Sets Defined by Iterated Function Systems 

      Hepting, Daryl H. (University of Regina, 1991-03)
      An iterated function system (IFS) is defined to be a set of contractive affine transformations. When iterated, these transformations define a closed set, called the attractor of an IFS, which has fractal characteristics. ...
    • The Escape Buffer: Efficient Computation of Escape Time for Linear Fractals 

      Hepting, Daryl; Hart, John (Canadian Human Computer Communications Society, 1995-05-17)
      The study of linear fractals has gained a great deal from the study of quadratic fractals, despite important differences. Methods for classifying points in the complement of a fractal shape were originally developed for ...
    • Rendering Methods for Iterated Function Systems 

      Hepting, Daryl; Prusinkiewicz, Przemyslaw; Saupe, Dietmar (North-Holland, 1991-12)
      This paper describes rendering methods for iterated function systems (IFS’s). The rendering process consists of the generation of a field of data using an IFS and its visualization by means of computer graphics. Two groups ...
    • A Linear Model for Three-Way Analysis of Facial Similarity 

      Hepting, Daryl H.; Bin Amer, Hadeel Hatim; Yao, Yiyu (Springer, Cham, 2018-05-18)
      Card sorting was used to gather information about facial similarity judgments. A group of raters put a set of facial photos into an unrestricted number of different piles according to each rater’s judgment of similarity. ...
    • An Erdős-Ko-Rado theorem for the derangement graph of \(PGL_3(q)\) acting on the projective plane 

      Meagher, Karen; Spiga, Pablo (SIAM J. Discrete Math. 28, 2014)
      In this paper we prove an Erdős-Ko-Rado-type theorem for intersecting sets of permutations. We show that an intersecting set of maximal size in the projective general linear group \(PGL_3(q)\), in its natural ...
    • An Erdős-Ko-Rado theorem for finite \(2\)-transitive groups 

      Meagher, Karen; Spiga, Pablo; Tiep, Pham Huu (European Journal of Combinatorics, 2016)
      We prove an analogue of the classical Erdős-Ko-Rado theorem for intersecting sets of permutations in finite \(2\)-transitive groups. Given a finite group \(G\) acting faithfully and \(2\)-transitively on the set ...
    • MIKL´ OS-MANICKAM-SINGHI CONJECTURES ON PARTIAL GEOMETRIES 

      Meagher, Karen; Ihringer, Ferdinand (2016-06)
      In this paper we give a proof of the Mikl´os-Manickam-Singhi (MMS) conjecture for some partial geometries. Specifically, we give a condition on partial geometries which implies that the MMS conjecture holds. Further, ...
    • An Erdos-Ko-Rado theorem for the derangement graph of PGL(2,q) acting on the projective plane 

      Meagher, Karen; Spiga, Pablo (SIAM Journal on Discrete Mathematics, 2014)
      Let G = PGL(2, q) be the projective general linear group acting on the projec- tive line P_q. A subset S of G is intersecting if for any pair of permutations \pi and \sigma in S, there is a projective point p in P_q such ...
    • On Graphical Modeling of Preference and Comfort 

      Ahmed, Sultan; Mouhoub, Malek (2017)
      User's choices involve habitual behavior and genuine decisions. Habitual behavior is often represented using preferences. The conditional preference network (CP-net) is a graphical tool for representing and reasoning about ...
    • Three-Way Analysis of Facial Similarity Judgments 

      Hepting, Daryl H.; Bin Amer, Hadeel Hatim; Yao, Yiyu (2017-10-23)
      The card sorting problem involves the similarity judgments of pairs of photos, taken from a set of photos, by a group of participants. Given the lack of an objective standard for judging similarity, different participants ...
    • Discernibility in the Analysis of Binary Card Sort Data 

      Hepting, Daryl (Springer, 2013-10-11)
      In an open card sorting study of 356 facial photographs, each of 25 participants created an unconstrained number of piles. We consider all 63,190 possible pairs of photos: if both photos are in the same pile for a participant, ...