Redeemer University College is an undergraduate Christian liberal arts and science university located in Ancaster, Ontario, Canada. Founded in 1982, Redeemer stands in the Reformed Tradition and offers Bachelor of Arts, Bachelor of Education, and Bachelor of Science degrees. Wikipedia.
Brouwer D.H.,Redeemer University College |
Cadars S.,University of California at Santa Barbara |
Cadars S.,French National Center for Scientific Research |
Eckert J.,University of South Florida |
And 3 more authors.
Journal of the American Chemical Society | Year: 2013
A general protocol is demonstrated for determining the structures of molecularly ordered but noncrystalline solids, which combines constraints provided by X-ray diffraction (XRD), one-and two-dimensional solid-state nuclear magnetic resonance (NMR) spectroscopy, and first-principles quantum chemical calculations. The approach is used to determine the structure(s) of a surfactant-directed layered silicate with short-range order in two dimensions but without long-range periodicity in three-dimensions (3D). The absence of long-range 3D molecular order and corresponding indexable XRD reflections precludes determination of a space group for this layered silicate. Nevertheless, by combining structural constraints obtained from solid-state 29Si NMR analyses, including the types and relative populations of distinct 29Si sites, their respective 29Si-O- 29Si connectivities and separation distances, with unit cell parameters (though not space group symmetry) provided by XRD, a comprehensive search of candidate framework structures leads to the identification of a small number of candidate structures that are each compatible with all of the experimental data. Subsequent refinement of the candidate structures using density functional theory calculations allows their evaluation and identification of "best" framework representations, based on their respective lattice energies and quantitative comparisons between experimental and calculated 29Si isotropic chemical shifts and 2J( 29Si-O-29Si) scalar couplings. The comprehensive analysis identifies three closely related and topologically equivalent framework configurations that are in close agreement with all experimental and theoretical structural constraints. The subtle differences among such similar structural models embody the complexity of the actual framework(s), which likely contain coexisting or subtle distributions of structural order that are intrinsic to the material. © 2013 American Chemical Society.
Eastwick P.W.,University of Texas at Austin |
Luchies L.B.,Redeemer University College |
Finkel E.J.,Northwestern University |
Hunt L.L.,University of Texas at Austin
Psychological Bulletin | Year: 2014
A central element of interdependence theory is that people have standards against which they compare their current outcomes, and one ubiquitous standard in the mating domain is the preference for particular attributes in a partner (ideal partner preferences). This article reviews research on the predictive validity of ideal partner preferences and presents a new integrative model that highlights when and why ideals succeed or fail to predict relational outcomes. Section 1 examines predictive validity by reviewing research on sex differences in the preference for physical attractiveness and earning prospects. Men and women reliably differ in the extent to which these qualities affect their romantic evaluations of hypothetical targets. Yet a new meta-analysis spanning the attraction and relationships literatures (k = 97) revealed that physical attractiveness predicted romantic evaluations with a moderate-to-strong effect size (r= ~.40) for both sexes, and earning prospects predicted romantic evaluations with a small effect size (r= ~.10) for both sexes. Sex differences in the correlations were small (rdifference =.03) and uniformly nonsignificant. Section 2 reviews research on individual differences in ideal partner preferences, drawing from several theoretical traditions to explain why ideals predict relational evaluations at different relationship stages. Furthermore, this literature also identifies alternative measures of ideal partner preferences that have stronger predictive validity in certain theoretically sensible contexts. Finally, a discussion highlights a new framework for conceptualizing the appeal of traits, the difference between live and hypothetical interactions, and the productive interplay between mating research and broader psychological theories. © 2013 American Psychological Association.
Nazir J.,Redeemer University College
Journal of Environmental Education | Year: 2016
Recently, I applied a phenomenological methodology to study environmental education at an outdoor education center. In this article, I reflect on my experience of doing phenomenological research to highlight issues researchers may want to consider in using this type of methodology. The main premise of the article is that phenomenology, with its different philosophical base, can provide new perspectives on questions asked by environmental education researchers. However, using it requires researchers to take on significantly different philosophical stances from those of other more commonly used research methodologies. This may be challenging for some in practice. © 2016 Taylor & Francis Group, LLC
Kikkert J.,University of Guelph |
Berkelaar E.,Redeemer University College
Archives of Environmental Contamination and Toxicology | Year: 2013
Selenium (Se) plays a role in human health: It is an essential trace element but can be toxic if too much is consumed. The aim of this study was to determine which species of Se are most rapidly taken up and translocated to above-ground plant tissues. Specifically, we wished to determine if organic forms of Se in an exposure solution can contribute to the amount of Se found in shoot tissue. Durum wheat (Triticum turgidum) and spring canola (Brassica napus) were grown hydroponically, and young seedlings were exposed to 0.5 or 5.0 μM Se as selenate, selenite, seleno-methionione, or seleno-cystine for ≤300 min. Canola accumulated more Se than wheat, although the difference depended on Se speciation of the exposure solution. Organic forms of Se were taken up at a greater rate than inorganic forms. When exposed to 5.0 μM Se, the rate of uptake of selenite was 1.5- (canola) or 5-fold (wheat) greater than the rate of uptake of selenate, whereas seleno-methionine was taken up 40- (canola) or 100-fold (wheat) faster and seleno-cystine 2- (wheat) to 20-fold (canola) faster. Plants exposed to seleno-methionine had the highest shoot concentrations of Se even though selenate was more mobile once taken up; in plants exposed to selenate 〉 50 % of accumulated Se was translocated to shoot tissue. Because organic forms of Se (especially selenomethionine) can be readily taken up and translocated to above-ground tissues of wheat and canola, these Se species should be considered when attempting to predict Se accumulation in above-ground plant tissues. © Springer Science+Business Media New York 2013.
Gary Chiang R.,Redeemer University College
Physiological Entomology | Year: 2010
In the female reproductive system of the relatively large hemipteran, the western conifer seed bug Leptoglossus occidentalis (Heidemann), a cuticle-lined tube extends medially along the surface of the vagina from the proximal end of the spermathecal complex anteriorly to the base of the common oviduct. This medial tube houses the proximal end of the spermathecal duct, thereby enabling the transport of material from the spermatheca at the distal end of the spermathecal complex, past the vagina (or bursa copulatrix) and directly to the common oviduct. The proximal portion of the spermathecal complex also contains an insemination duct that is separate from the spermathecal duct. The insemination duct allows the male intromittent organ to extend from the vagina to the spermatheca without navigating through the spermathecal duct. The reproductive systems of two previously studied Hemiptera, the milkweed bug Oncopeltus fasciatus (Dallas) and the box elder bug Leptocoris trivittatus (Say), possess a similar cuticle-lined medial tube housing the spermathecal duct. This new information provides a clearer understanding of sperm transport in the female reproductive system of Lygaeidae bugs, and helps to clarify the path of the male organ during copulation, as well as the movement of sperm during egg laying. © 2009 The Author. Journal compilation © 2009 The Royal Entomological Society.
Brouwer D.H.,Redeemer University College |
Langendoen K.P.,Redeemer University College
CrystEngComm | Year: 2013
An NMR crystallography strategy is presented for solving the structures of materials such as zeolites and related network materials from a combination of the unit cell and space group information derived from a diffraction experiment and a single two-dimensional NMR correlation spectrum that probes nearest-neighbour interactions. By requiring only a single 2D NMR spectrum, this strategy overcomes two limitations of previous approaches. First, the structures of materials having poor signal-to-noise in solid-state NMR experiments can be investigated using this approach since a series of 2D spectra is not required. Secondly, the structures of aluminophosphate materials can potentially be determined from 27Al/31P solid-state NMR experiments since this approach does not require the isolated spin pairs which have been important for determining structures of silicate materials by 29Si solid-state NMR. Using concepts from graph theory, the structure solution strategy is described in detail using a hypothetical two-dimensional network structure. A collection of two-dimensional network structures generated by the algorithm under various initial conditions is presented. The algorithm was tested on a series of 27 zeolite framework types found in the International Zeolite Association's zeolite structure database. Finally, the structure of the zeolite ITQ-4 was solved from powder X-ray diffraction data and a single 29Si double quantum NMR correlation spectrum. The limitations of the strategy are discussed and new directions for this approach are outlined. © 2013 The Royal Society of Chemistry.
Bhaduri R.K.,McMaster University |
Van Dijk W.,McMaster University |
Van Dijk W.,Redeemer University College |
Murthy M.V.N.,Chennai Mathematical Institute
Physical Review Letters | Year: 2012
It is suggested that for a Fermi gas at unitarity, the two-body bond plays a special role. We propose an equation of state using an ansatz relating the interaction part of the l-body cluster to its two-body counterpart. This allows a parameter-free comparison with the recently measured equation of state by the ENS group. The agreement between the two over a range of fugacity (z<5 for a homogeneous gas, and z<10 for the trapped gas) leads us to perform the calculations of more sensitive quantities measured recently by the MIT group. © 2012 American Physical Society.
Brouwer D.H.,Redeemer University College
Solid State Nuclear Magnetic Resonance | Year: 2013
An algorithm is presented for solving the structures of silicate network materials such as zeolites or layered silicates from solid-state 29Si double-quantum NMR data for situations in which the crystallographic space group is not known. The algorithm is explained and illustrated in detail using a hypothetical two-dimensional network structure as a working example. The algorithm involves an atom-by-atom structure building process in which candidate partial structures are evaluated according to their agreement with SiOSi connectivity information, symmetry restraints, and fits to 29Si double quantum NMR curves followed by minimization of a cost function that incorporates connectivity, symmetry, and quality of fit to the double quantum curves. The two-dimensional network material is successfully reconstructed from hypothetical NMR data that can be reasonably expected to be obtained for real samples. This advance in NMR crystallography is expected to be important for structure determination of partially ordered silicate materials for which diffraction provides very limited structural information. © 2013 Elsevier Inc.
Schuurman D.C.,Redeemer University College
SIGCSE 2013 - Proceedings of the 44th ACM Technical Symposium on Computer Science Education | Year: 2013
This paper describes a sequence of assignments, each build-ing upon the next, leading students to a working simulation of a simple 8-bit CPU (Central Processing Unit). The de-sign features a classic Von Neumann architecture compris-ing a simple data path with a few registers, a simple ALU (Arithmetic Logic Unit), and a microprogram to direct all the control signals. The first step involves the design of the ALU which is capable of eight basic operations. The second step guides students to construct a datapath complete with several 8-bit registers. The third step involves the design and implementation of a control unit which uses a microprogram to implement machine code instructions. The microprogram implements nine basic machine language instructions which are sufficient for writing many simple programs. The fi-nal step involves adding program memory and an input and output device to form a simple working simulation of a com-puter. At this point, students may hand-assemble code for their CPU and simulate its execution. All simulations are performed using a free and open source simulator called Logisim which performs digital logic simu-lations with the ability to build larger circuits from smaller subcircuits. Students can set an adjustable clock rate and observe the internal CPU state and registers as it retrieves instructions and steps through the microcode. The basic CPU architecture provides many opportunities for more ad-vanced exercises, such as adding an instruction fetch unit, adding pipelining, or adding more machine language instruc-tions. The assignments were introduced in a second year course on computer organization, providing an effective hands-on approach to understanding how a CPU actually oper-ates. Copyright © 2013 ACM.
Chiang R.G.,Redeemer University College
Arthropod Structure and Development | Year: 2010
The anatomy of the female reproductive tract and the nerve-evoked contractions of the vagina muscles and their association with the ovipositor in the western conifer seed bug, Leptoglossus occidentalis (Heidemann) are investigated for the first time. The reproductive tract consists of a set of paired telotrophic ovaries, each containing seven ovarioles, located in the anterior lateral regions of the abdomen. Each ovary is attached to a lateral oviduct which spans most of the abdomen to attach to a relatively short common oviduct that joins the vagina near the rear of the animal. The vagina is associated with a pair of bilaterally symmetrical muscles attached at their posterior ends to lateral extensions of sternite VIII, the valvifer of the Type II ovipositor. From this attachment site, the muscles fan out medially and anteriorly to converge along the dorsal midline of the vagina up to the base of the common oviduct. Vagina muscles respond to a single stimulation of their motor nerves by producing a smooth contraction lasting approximately 1 s. With increasing frequencies of stimulation, the muscle contractions summate to create a tetanic response. The muscles are fatigue resistant being able to maintain the same degree of tension for up to 10 min at 10 Hz stimulation. Visual observation shows that other muscles associated with the valves of the ovipositor behave in a similar fashion to that of the vagina muscles from which the tension recordings were obtained. Fatigue-resistant vagina muscles are discussed in relation to copulation, sperm transport and this insect's ability to deposit a series of eggs directly onto the surface of a conifer needle in a manner by which eight or more blunt-ended eggs are packed end-to-end in a single row. © 2010 Elsevier Ltd. All rights reserved.