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Showing papers by "University of Windsor published in 1983"


Journal ArticleDOI
TL;DR: In this article, a review of the alloy groups which absorb large quantities of hydrogen is presented, with emphasis placed on thermodynamic and kinetic properties, activation and deactivation, poisoning effects and storage capacity.
Abstract: Metal hydrides, as energy storage media, are receiving considerable attention. The amount of literature concerning the properties of these materials has increased markedly over the past few years. In this paper, we conduct a review of the alloy groups which absorb large quantities of hydrogen. These alloy classes are designated as AB5, AB, AB2, AB3 and A2B7 and Mg-based compounds. These materials are discussed with emphasis placed on thermodynamic and kinetic properties, activation and deactivation, poisoning effects and storage capacity.

153 citations


Journal ArticleDOI
01 Aug 1983-Heredity
TL;DR: Allozyme studies of Daphnia pulex populations in southern Ontario revealed marked Hardy–Weinberg deviations, complete gametic phase imbalance, and high heterozygosity values, which reflect the loss of sexual reproduction.
Abstract: Allozyme studies of Daphnia pulex populations in southern Ontario revealed marked Hardy–Weinberg deviations, complete gametic phase imbalance, and high heterozygosity values. These genotypic characteristics reflect the loss of sexual reproduction; individuals reproduce by obligate parthenogenesis. Thirty-nine clones were identified in the twenty-one habitats surveyed; a few of these clones retained the ability to produce male offspring. Several clones were present in many habitats, but most of the thirty-nine clones were found in only a single pond. The large genetic distances between coexisting clones suggested that in situ mutational divergence was not the source of within habitat clonal diversity. Ecological differences between clones were suggested by distributional patterns and by temporal surveys of clone frequencies.

124 citations


Journal ArticleDOI
TL;DR: The Category Test performances of two groups of children who performed at the same impaired level in mechanical arithmetic, but who exhibit quite different patterns of performance on academic and neuropsychological measures are compared as discussed by the authors.
Abstract: The Category Test performances of two groups of children who performed at the same impaired level in mechanical arithmetic, but who exhibit quite different patterns of performance on academic and neuropsychological measures are compared. Significant differences between the two groups on the Category Test are interpreted in the light of the different patterns of neuropsychological abilities and deficits of these two groups. Some socio‐emotional and remedial ramifications of the pattern exhibited by the group with “specific”; arithmetic disability are discussed.

110 citations


Journal ArticleDOI
TL;DR: The model optimizes the expected total cost per accepted component resulting from type I errors, type II errors, cost of added inspection, and ordering of quality characteristics for inspection to determine the optimal number of inspections.
Abstract: In this paper a mathematical model is developed for determining the optimal number of inspections for multicharacteristic components where failure can be catastrophic. The model optimizes the expected total cost per accepted component resulting from (1) type I errors, (2) type II errors, (3) cost of added inspection, and (4) ordering of quality characteristics for inspection. The model considers components with several characteristics to be inspected. Failure to meet the quality requirements of any one characteristic results in the rejection of the component. Taking into consideration all three costs referred to above, a mathematical expression for expected total cost per accepted component is obtained. Also, an expression is developed for finding the optimal sequence of characteristic inspection. Finally, a computational procedure is outlined to determine the optimal sequence of characteristic inspection and the optimal number of inspections using the two expressions stated above.

98 citations


Journal ArticleDOI
TL;DR: Chloroplast DNAs from soybean, common bean and mung bean have been compared in overall structure and nucleotide sequence homologies and it is shown that chloroplast ribosomal DNA is relatively conserved and the two deletion/addition regions relatively diverged in base sequence.
Abstract: Chloroplast DNAs from soybean (Glycine max), common bean (Phaseolus vulgaris) and mung bean (Vigna radiata) have been compared in overall structure and nucleotide sequence homologies. Detailed restriction maps demonstrate that the soybean and common bean genomes possess the classical large chloroplast DNA inverted repeat, encoding ribosomal RNA genes, as found previously in mung bean (Palmer and Thompson 1981 a). Heterologous filter hybridizations indicate essentially complete colinearity between mung bean and common bean chloroplast DNAs. Although the linear order of sequence elements is also conserved between soybean and mung bean DNAs, two regions of deletions/additions, each totaling almost 5 kilobase pairs in size, have been identified at the ends of the large single copy DNA region. Alignment and comparison of restriction maps has allowed calculation of nucleotide sequence divergence values for the three DNAs. Mung bean and soybean chloroplast DNAs differ by an average of 10–13% in nucleotide sequence, while mung bean and common bean are significantly more closely related, differing by only 5–6% in base sequence. Base substitutions are distributed non-randomly in these chloroplast DNAs; chloroplast ribosomal DNA is relatively conserved and the two deletion/addition regions relatively diverged in base sequence.

92 citations


Journal ArticleDOI
TL;DR: This chromogen system has been adapted for enzymatic determinations of hydrogen peroxide and of glucose in the 10- to 45-nmol range and of choline in the 5- to 20- nmol range.

83 citations


Journal ArticleDOI
TL;DR: EDTA-separated epidermis showed better retention of ultrastructural integrity when washed with phosphate-buffered saline and by eliminating Trismal buffer as a tissue rinse.

59 citations



Journal ArticleDOI
TL;DR: In this paper, the C4' 1 Sigma u+ state of N2 has been studied using electron-polarized-photon coincidence techniques and pseudo-threshold polarisation measurements have been demonstrated to be in good agreement with theoretical predictions.
Abstract: Excitation of the C4' 1 Sigma u+ state of N2 has been studied using electron-polarised-photon coincidence techniques. Pseudo-threshold polarisation measurements have been demonstrated to be in good agreement with theoretical predictions. Systematic polarisation correlation data for electron-scattering angles up to 15 degrees are also presented.

49 citations


Journal ArticleDOI
TL;DR: Despite significant daily changes in serum levels of toxic substances retained in uremia, there was little or no evidence to suggest that well-dialyzed patients undergo daily fluctuations in their cognitive and sensory-motor functioning.
Abstract: Twenty chronically dialyzed adults were administered a repeatable battery of 14 cognitive and sensory-motor tests on 3 consecutive days: immediately prior to their midweek dialysis, approximately 20 hr after their midweek dialysis, and again immediately prior to their end-of-the week dialysis. Serum electrolyte and methylamine analyses were performed at each test session. When compared to established norms, these patients scored within the normal range in a wide variety of areas. Limited impairments, probably due to peripheral neuropathy, were in evidence on the Grooved Pegboard, Finger Tapping (females), and Grip Strength (females) measures. Impairments suggestive of cerebral dysfunction were also noted on the Benton Visual Retention Test and on the Trail Making Test, Parts A and B, with particularly severe impairment noted on Part B. Despite significant daily changes in serum levels of toxic substances retained in uremia, there was little or no evidence to suggest that well-dialyzed patients undergo daily fluctuations in their cognitive and sensory-motor functioning.

47 citations


Journal ArticleDOI
TL;DR: In this paper, the major and trace-element contents were determined by X-ray fluorescence, and the data used to test hypotheses on the genesis and fractionation of the gabbros.

Journal ArticleDOI
TL;DR: In this paper, the authors show that during the Late Paleozoic glaciation, glaciers moved from southern Africa over a platform composed of crystalline and sedimentary rocks into the subsiding Parana Basin of southeastern Brazil.


Journal ArticleDOI
TL;DR: In this article, the maximum centerline penetrations of cross-current liquid jets in a Venturi scrubber were measured for orifice diameters, d, of 1.397, 2.108 and 3.860 mm.
Abstract: The maximum centreline penetrations, l**, of cross-current liquid jets in a Venturi scrubber were measured for orifice diameters, d, of 1.397, 2.108, 2.565 and 3.860 mm. The data are correlated by for the range of conditions, 36 ≤ gas throat velocity Vg ≤ 125 m/s; 1.2 ≤ liquid injection velocity Vj ≤ 18 m/s; 0.06 ≤ liquid to gas ratio On a mesure la penetration maximale sur l'axe central, de jets liquides en ecoulement transversal dans un epurateur Venturi, pour des diametres d'orifices de 1.397, 2.108, 2.565 et 3.860 mm. On a etabli une correlation entre les resultats obtenus au moyen de l'equation: dans les limites des conditions suivantes: 36 ≤ la vitesse du gaz a la gorge de l'epurateur Vg ≤ 125 m/sec. 0.06 ≤ liquid to gas ratio

Journal ArticleDOI
TL;DR: The adults of many Lepidoptera augment carbohydrate and protein reserves accumulated during larval life by feeding on nectar or sap flows by having functional mouthparts in the adult stage, while in other taxa the mouth-parts are aborted.
Abstract: The adults of many Lepidoptera augment carbohydrate and protein reserves accumulated during larval life by feeding on nectar or sap flows. However, the adults of other species have non-functional mouthparts. The feeding behaviour of the species in a particular family or subfamily tends to be stereotyped. Thus in some taxa nearly all of the species have functional mouthparts in the adult stage, while in other taxa the mouth-parts are aborted. In those taxa whose adults feed, eggs are nearly always laid singly or in pairs. By contrast a significant proportion of the species whose adults fail to feed lay their eggs in clusters. This shift in egg laying behaviour can be explained by recognizing that an increased proportion of the energy reserves stored during larval life can be directed towards egg production if females engage in limited flight.

Journal ArticleDOI
TL;DR: In this paper, the authors describe the theory, simulation, and construction of a two-dimensional number theoretic transform (NTT) convolver, which performs indirect convolution by using the cyclic convolution property of a class of generalized discrete Fourier transforms (DFT's) defined over rings isomorphic to direct sums of Galois fields.
Abstract: This paper describes the theory, simulation, and construction of a two-dimensional number theoretic transform (NTT) convolver. The convolver performs indirect convolution by using the cyclic convolution property of a class of generalized discrete Fourier transforms (DFT's) defined over rings isomorphic to direct sums of Galois fields. The paper first presents the theoretical development of the computational element required for computing the generalized discrete Fourier transform (GDFIT) and its inverse. The theory extends the use of base fields to second degree extension fields and provides efficient choices for transform parameters to minimize hardware. The paper next presents results of recent work in multidimensional transform memory structures, and extends this work to the complete convolution process. The two theories are then "married" to produce efficient, very high speed convolution architectures. Simulation results are presented for a second degree extension field image convolver and constructional details are presented for a fast image convolver using 2 base fields and designed to operate as a peripheral to a fast 32 bit minicomputer.

Journal ArticleDOI
TL;DR: In this article, He-like x-ray line spectra for sulfur and chlorine impurity ions in the Alcator-$C$ tokamak plasma are reported and compared with atomic calculations employing accurate atomic data which take into consideration effects on the line ratios due to collisional coupling between the $n=2$ states involved.
Abstract: Measurements of He-like x-ray line spectra for sulfur and chlorine impurity ions in the Alcator-$C$ tokamak plasma are reported. Results are presented on the relative line ratios of the resonance (w), intercombination (x and y), and forbidden (z) lines as well as dielectronic satellite lines for plasma conditions of ${T}_{e}=1.0\ensuremath{-}1.8$ keV and ${N}_{e}=(1.5\ensuremath{-}7)\ifmmode\times\else\texttimes\fi{}{10}^{14}$ ${\mathrm{cm}}^{\ensuremath{-}3}$. The results are compared with atomic calculations employing accurate atomic data which take into consideration effects on the line ratios due to collisional coupling between the $n=2$ states involved.

Journal ArticleDOI
TL;DR: Advances in cognitive/developmental psychology and neuropsychology and its sister disciplines in the neurosciences suggested clearly that higher-order cognitive skills and brain systems, although interrelated to some extent, are differentiable and dissociable.
Abstract: One important similarity between the study of learning disabilities in children and the investigation of brain-impaired individuals from a neuropsychological standpoint is the parallel dialectical nature of their respective histories. Within each field, there have been two diametrically opposed viewpoints that have captured the imagination of factions within these two areas of inquiry. One of these viewpoints holds that impaired individuals (be they learning disabled or brain damaged) have very much in common with others so afflicted. Specifically, this is expressed by those who would maintain that there is such a unitary entity as \"the learningdisabled child\" or \"the brain-damaged syndrome.\" Investigators and clinicians who ascribe to such a viewpoint would suggest that useful, heuristic comparisons can be drawn for investigative and clinical purposes between learning-disabled (e.g., reading-disabled) children and normal children on the one hand or between brain-damaged individuals and \"controls\" on the others. Students of research and clinical practice within each of these two areas of discourse will recognize immediately that these investigative and applied strategies characterize the earliest efforts in these fields. However, there always has been a second group of scientists and clinicians within both areas who have maintained that persons afflicted with learning disabilities and those afflicted with verified brain damage exhibit very unique, idiosyncratic, nongeneralizable reactions to their afflictions and, as such, must be treated in an ideographic manner. Investigators in this tradition would suggest that the single-case study is the only viable means for discovering valid scientific information; clinicians of this persuasion would argue that the important dimensions of both of the sets of abnormalities under consideration are individualized to the extent that meaningful generalizations about either of the groups as a whole are virtually meaningless. As with any two extreme viewpoints such as these, we have come to expect (with Aristotle) that practical wisdom will lie somewhere within the golden mean and (with Hegel) that the dialectical interplay of such extremes will eventuate in a synthesis that embraces and refines the truth evident in each. It is within this context that the search for subtypes in both learning-disabled children and braindamaged individuals has been spawned. With respect to investigations of the \"learning-disabled child\" that accepted implicitly the homogeneous nature of this classification, early attempts were aimed at the identification of the presumable unitary cause of this condition. These studies only served to produce a lengthy catalogue of variables which differentiated learning-disabled children from socalled \"normals\" (Rourke, 1978). Indeed, based on even the most cursory review of the learning disability literature of the 1960s and early 1970s, it is evident that almost any single measure of perceptual, psycholinguistic or higher-order cognitive skill could be used to illustrate the superiority of normal children over a comparable group of children diagnosed as learning disabled. A parallel development in the neuropsychology of the verified brain damaged produced a plethora of investigations seeking the definitive measure that would differentiate \"organic\" from \"nonorganic\" sources of behavioral pathology. Needless to say, many such measures were found. In terms of practical experience with children who exhibit marked learning disabilities and persons with well-documented brain damage, however, it is evident that only some of these individuals responded positively to particular forms of treatment. Indeed, it is clear that some forms of treatment for some afflicted individuals within each of these categories were actually counterproductive (Rourke, 1980). Furthermore, advances in cognitive/developmental psychology and neuropsychology and its sister disciplines in the neurosciences suggested clearly that higher-order cognitive skills and brain systems, although interrelated to some extent, are differentiable and dissociable. Thus, both theoretical and practical advances produced evidence that flew in the face of the unitary syndrome approach in each of these two areas of investigation (see Fletcher, Satz, & Vellutino, 1979 for an extended criticism of the unitary deficit hypothesis in the case of learning disabilities). This complex, and perhaps confusing, state of affairs might lead one to propose that learning-disabled children and braindamaged individuals are, indeed, idiosyncratic in terms of their ability structure and/or responses to their affliction. At the same time it has become clear that an extreme individualistic standpoint is viable on neither practical (applied/clinical) nor theoretical grounds. Thus, clinical groupings of childen who could quite realistically be labelled as learning disabled began to appear in the literature (e.g., Boder, 1973; Johnson & Myklebust, 1967). These clinical investigators were of the opinion that such subgroupings were necessary primarily because of their differential responses to remedial programs. Similar developments relating to functional localization and hemispheric differentiation (e.g., Diller, Ben-Yishay, Gerstmann, Goodkin, Gordon, & Weinberg (1974); Luria, 1974) were identified largely, although not exclusively, on the basis of differential response to treatment. In the latter case especially, a melding of both practical imperatives and an emerging consensus regarding models of brain-behavior rela-

Journal ArticleDOI
TL;DR: In this paper, the velocity profiles in a laminar axisymmetric submerged jet of water were taken using a laser-Doppler anemometer, and the velocity profile data were taken at sufficiently small radial increments to allow a determination of the jet kinematic momentum using the basic integral definition.
Abstract: Detailed measurements of the velocity profiles in a laminar axisymmetric submerged jet of water were taken using a laser-Doppler anemometer. A non-intrusive measurement technique is particularly advantageous in this application owing to the unstable nature of the laminar jet and the destabilizing effect which objects submerged in the jet have. Flow visualization was employed to ensure that all of the measuring points were located within the laminar region of the jet.The variation of centreline velocity, jet half-radius and velocity-profile shape are investigated for various Reynolds numbers and axial distances. Emphasis is placed on the jet-development region; however, data from the fully developed region are also presented. Particular attention is given to determine the proper non-dimensional groups which are required to collapse the data. The predictions of a simple boundary-layer analysis are used as a guide in this regard and found to give an accurate representation of the flow field.Velocity-profile data were taken at sufficiently small radial increments to allow a determination of the jet kinematic momentum using the basic integral definition. Although approximately constant, a slight variation with axial distance is indicated. The momentum initially decreases, and then increases gradually to a value greater than that at the tube exit. An attempt to explain the trend of the variation is made using certain hypotheses regarding the velocity and pressure conditions at the tube exit.

Journal ArticleDOI
TL;DR: In this article, the fragmentation of SO2 following dissociative electron impact excitation has been studied under single collision conditions for incident electron energies up to 500 eV. Absolute emission cross sections have been measured for the most intense lines and the maximum values were found to range from 1-12 × 10−19 cm2 with an uncertainty of approx. ± 35%.

Journal ArticleDOI
TL;DR: In this paper, the electric field at the electrode-solid insulator-vacuum junction has been found to have a strong dependence on both the contact angle and the solid insulator material.
Abstract: The insulation strength of a vacuum gap bridged by a solid insulator is lower than that in the absence of the solid insulator. The triple junction formed by the solid insulator, electrode, and vacuum in vacuum devices (or a gas in high-pressure apparatus) has a critical influence on the withstand voltage level of the insulating gap. The electric field is calculated using the charge simulation technique at the triple junction as a function of the junction geometry. The dependence of the field is studied for a varying contact angle a between the solid insulator and the electrode in the range 0 to 90°, for a varying ratio r/D of the radius of curvature r of the rounded edge of the solid insulator at the junction to the length of the insulator D, at a fixed r/D and varying r and D and for different practical insulator materials having relative dielectric permittivities ?£ in the range 2.1 to 12000. It has been found that the electrical field at the electrode-solid insulatorvacuum junction has a strong dependence on both the contact angle and the solid insulator material. The tangential and normal components of the electric fields are determined at the solid insulator-vacuum boundary and away from the boundary both inside the solid insulator and in the vacuum. Large enhancements in the electric field at the triple junction are found. The effects of the parameters ?, r, and ?r on the with-stand voltage of the insulating gap are discussed.

Journal ArticleDOI
01 Nov 1983-Fuel
TL;DR: In this paper, electron spin resonance measurements at 35 GHz have revealed two spectral components in natural bituminous coal, i.e., exchange narrowing and hydrogen within 0.6 nm of the paramagnetic centres in solvent refined versus natural coal.

Journal ArticleDOI
TL;DR: In this article, the authors considered static spherical neutron stars undergoing radial perturbation and showed that the group velocity v/sub g/ is always greater than the adiabatic sound speed V/sub s/.
Abstract: Static spherical neutron stars undergoing radial perturbation are considered. For sound waves accompanying the radial perturbations, it is shown that the group velocity v/sub g/ is always greater than the adiabatic sound speed v/sub s/. Thus ultrabaric stellar interiors (v/sub s/>c) must have v/sub g/>c.

Journal ArticleDOI
TL;DR: In this paper, the leading two terms in the 1/Z expansion of the two-electron Bethe logarithm are calculated by the application of a new finite basis set method.
Abstract: The leading two terms in the 1/Z expansion of the two-electron Bethe logarithm are calculated by the application of a new finite basis set method. The results can be expressed in the form ln epsilon (1s2 1S)=ln(19.77(Z-0.0063)2). The high-Z behaviour appears to differ from that of a previous variational calculation by Aashamar and Austvik (1976).

Journal ArticleDOI
TL;DR: Steady-state and time-dependent non-Newtonian properties of structurally complex systems, such as suspensions and foodstuffs, are simulated by the extension of a recently developed fluid model that successfully describes pseudoplastic and thixotropic behavior, with or without yield stress.
Abstract: Steady-state and time-dependent non-Newtonian properties of structurally complex systems, such as suspensions and foodstuffs, are simulated by the extension of a recently developed fluid model. This model accommodates the concept of structure variation induced by flow via a kinetic approach similar to the treatment of reversible chemical reactions. Purely viscous and viscoelastic responses are considered, entailing different equations for the computation of their contribution to the overall stress sustained by the systems. The model successfully describes pseudoplastic and thixotropic behavior, with or without yield stress.


Journal ArticleDOI
TL;DR: In this paper, the authors measured the Brillouin shift for LIkSO 4 as a function of temperature in the range 300-363°K and observed a structural phase transition at 333°K.

Journal ArticleDOI
TL;DR: In this article, an approximate constitutive equation for the bulk stress tensor for a dilute suspension of rigid spherical particles in a second-order fluid was proposed. But it was found that the new equation predicts no variation in the shear viscosity, but predicts enhancement of the pre-existing non-Newtonian nature of the suspending fluid with regard to the normal stress functions.
Abstract: In this paper we study the rheological behavior of a dilute suspension of rigid spherical particles in a second-order fluid. We extend the results of viscous fluids to discuss the expression for the bulk stress tensor of a second-order fluid and also obtain an approximate solution to the shear flow problem of this fluid. By combing these results, we write an approximate constitutive equation for the bulk stress tensor for such a suspension and study it in a shear flow. It is found that the new equation predicts no variation in the shear viscosity, but predicts enhancement of the pre-existing non-Newtonian nature of the suspending fluid with regard to the normal stress functions.

Journal ArticleDOI
TL;DR: To determine the roles of mutation, migration, and selection in maintaining genetic variability in populations of house mice (Mus musculus), stochastic models based on characteristics of mouse populations inhabiting corn cribs in southwestern Ontario and the t allele were developed.
Abstract: To determine the roles of mutation, migration, and selection in maintaining genetic variability in populations of house mice (Mus musculus), stochastic models based on characteristics of mouse populations inhabiting corn cribs in southwestern Ontario and the t allele were developed. Two sets of models were examined. One involved selection against t/t mice and a migration rate of 0.05 to 0.10 (low migration model) whereas the other involved selection against both t/t and +/t genotypes and a migration rate of 0.33 (high migration model). Both models could account for the t allele frequencies observed in natural populations. Similarly both models explain the frequencies observed at a second polymorphic locus, the Hbb locus which controls the β chain of the hemoglobin molecule, provided strong selection favoring the Hbb heterozygotes is incorporated. Without such selection pressure rapid extinction of one of the alleles at this locus occurred. A stabilizing force such as selection is considered necessary for ...

Journal ArticleDOI
TL;DR: In this paper, a study of electron-impact excitation of highly charged ions in the helium isoelectronic sequence is reported, and collision strengths are computed for transitions up to and including the n=3$ states.
Abstract: A study of electron-impact excitation of highly charged ions in the helium isoelectronic sequence is reported. Nonresonant, intermediate-coupling collision strengths are computed for transitions up to and including the $n=3$ states. With the 13 fine-structure levels, i.e., $1{s}^{2}(^{1}S_{0})$, $1s2s(^{3}S_{1};^{1}S_{0})$, $1s2p(^{3}P_{0,1,2};^{1}P_{1})$, $1s3s(^{3}S_{1};^{1}S_{0})$, and $1s3p(^{3}P_{0,1,2};^{1}P_{1})$, there are 78 different inelastic transitions. Main calculations are carried out in the nine-state distorted-wave approximation including partial waves $l\ensuremath{\le}15$. Relativistic effects are taken into account in the Breit-Pauli approximation. Nine-state close-coupling calculations are also carried out for ${\mathrm{Fe}}^{24+}$ with $l\ensuremath{\le}4$ at a few energies for comparison (and for later work in paper II). Higher partial waves ($lg15$) are treated by the Coulomb-Bethe method using accurate relativistic eigenenergies and oscillator strengths for the target ions. The $Z$ dependence of the departure from $\mathrm{LS}$ coupling is investigated. Present results are in good general agreement with previous calculations where available, but some discrepancies are noted or clarified. Collision strengths are tabulated at energies from near the excitation energy of the $n=3$ complex to sufficiently high energies to enable rate coefficients to be computed. For transitions to the $n=3$ levels and for transitions where resonances are not important, the present values should yield reasonably accurate excitation rates (resonances are considered in paper II). The present data are required particularly for the analysis of observed spectra from high-temperature, high-density plasmas where the line intensities may depend on collisional redistribution among a number of excited $n=2$ and $n=3$ states.