Showing papers by "University of Windsor published in 1982"
TL;DR: A recent theoretical position is employed as a framework for a neurodevelopmental model of central processing deficiencies in children and it is shown to embrace a wide variety of behavioural phenomena that have been observed in normal children and in various subtypes of learning-disabled children.
Abstract: A recent theoretical position (Goldberg & Costa, 1981) is employed as a framework for a neurodevelopmental model of central processing deficiencies in children. The model, which emphasizes differences between right-hemisphere and left-hemisphere systems, is shown to embrace a wide variety of behavioural phenomena that have been observed in normal children and in various subtypes of learning-disabled children. Dynamic factors operative within the development of both normal and disabled learning are addressed and incorporated.
249 citations
TL;DR: In this paper, a technique for designing recursive digital filters to approximate simultaneously given magnitude and linear phase characteristics is presented. But the linear phase is specified in terms of a desired constant group delay and the constraints of the linear program become a function of desired group delay.
Abstract: A technique is presented whereby a class of recursive digital filters can be designed to approximate simultaneously given magnitude and linear phase characteristics. The underlying approach is to linearize the inherently nonlinear approximation problem, and thereby use linear programming to carry out the approximation. The linear phase is specified in terms of a desired constant group delay. Therefore, the constraints of the linear program become a function of desired group delay. Thus the design algorithm consists of carrying out a univariant search within a range of group delay values to obtain a minimum error of approximation. Several examples of design are presented to illustrate the usefulness of the method.
172 citations
TL;DR: The findings suggest that the strains NZB and NZC stemmed from a European founder stock which differed from the ancestral stocks of other laboratory strains and that the ancestral mice of the RR strain had been transported from China to Japan.
128 citations
TL;DR: Estimated rates of N(2) production appeared to be initially high, decreased rapidly within a few hours, and then gradually increased with time after the establishment of anaerobic conditions, which may be expected of a reaction proceeding by several consecutive steps.
Abstract: Nitric oxide, nitrous oxide, and nitrite ion production was measured in a Brookston clay column undergoing anaerobic denitrification. A flow system method was used whereby argon carrier gas continuously stripped soil gases from the column, allowing steady-state rates to be obtained. Over several days the temporal change in rates of these gases and NO2− followed a pattern of increase and decay which may be expected of a reaction proceeding by several consecutive steps. The method permits observation of the relatively large net production rate of NO, which is normally not observed in static systems based on head space analysis of gaseous denitrification products. In the first several hours after the onset of anoxic conditions, the net rate of NO production, fNO, increased sharply to a maximum (∼1 × 10−10 mol of N/g of soil per min), paralleling the rapid increase in NO2− level, and then followed a more gradual decline extending over approximately 45 h. A similar but less pronounced pattern was observed for N2O, with net rates of production being considerably less than for NO. The ratio [NO-N]/[N2O-N] decreased with time from ∼2.5 at 6 h to ∼2.0 at 45 h. Estimated rates of N2 production appeared to be initially high, decreased rapidly within a few hours, and then gradually increased with time after the establishment of anaerobic conditions.
61 citations
TL;DR: In this paper, the Lamb shift of light muonic atoms is dominated by the "vacuum-polarization" term, and approximate numerical values using nonrelativistic wave functions are given here.
Abstract: Publisher Summary The generally good agreement between theory and experiment has provided an important check on the computational techniques of quantum electrodynamics in the presence of strong fields. Equally important confirmations of quantum electrodynamics in the low-energy regime provided by atomic physics have been obtained from studies of the anomalous magnetic moments of the electron and muon and of the properties of positronium and muonium. The study of quantum electrodynamic effects in one-electron systems has now reached a high state of refinement, both theoretically and experimentally. This chapter briefly summarizes the material contained in the older reviews and then discusses the progress that has been made since 1977, in detail. The Lamb shift of light muonic atoms is dominated by the “vacuum-polarization” term, and approximate numerical values using nonrelativistic wave functions are given here. The chapter provides a discussion on two-electron systems. High-precision calculations for two-electron atoms and ions are complicated by the necessity of simultaneously taking into account relativistic, QED, and electron-correlation effects. There is no unique way of specifying an exact relativistic two-electron Hamiltonian analogous to the Dirac Hamiltonian without at the same time including QED effects to all orders. The analysis of QED effects in atomic systems containing more than two electrons is obscured by the lack of high-precision nonrelativistic eigenvalues and relativistic corrections available for two-electron systems. It therefore becomes more difficult to make a reliable subtraction of these contributions from the observed transition frequencies to reveal the specifically QED effects such as the Lamb shift.
58 citations
TL;DR: In this paper, the electrochemical oxidation of anodic Zn, Cd or Hg into acetonitrile solutions of RSH (or R 2 S 2 ) gives the corresponding M(SR) 2 compounds in high yield.
46 citations
TL;DR: In this article, relativistic generalizations are derived for the well-known non-relativistic electric-dipole oscillator-strength sum rules, which include both positive and negative energy states.
Abstract: Relativistic generalizations are derived for the well-known nonrelativistic electric-dipole oscillator-strength sum rules. The relativistic sum rules include both positive- and negative-energy states. The derivations are valid for a Dirac electron in an arbitrary local potential. We also present a number of simple integral properties related to the relativistic virial theorem which are useful in the calculation of matrix elements.
44 citations
TL;DR: In this paper, the effect of an initial out-of-straightness on the buckling strength of a single-crossarm stayed column is investigated, where the authors used the finite element method and a mixed incremental and iterative procedure to determine the relationship between applied load, lateral deflection and the tension in the stays.
Abstract: The effect of an initial out-of-straightness on the buckling strength of a single-crossarm stayed column is investigated. A geometrical study of the stayed column is used to determine the relationship between the applied load, lateral deflection and the tension in the stays. The geometrical nonlinear behaviour is included in the analysis by using the finite element method and a mixed incremental and iterative procedure. Numerical examples are used to demonstrate the influence of varying the stayed column parameters on the buckling load, deflection rate, as well as the minimum effective, optimum and maximum possible pretensions. Experimental results obtained from a single-crossarm stayed colum with various initial pretensions in the stays are presented and compared with theoretical results, and good agreement was obtained. The results indicate that the presence of an initial out-of-straightness changes the deflection rate and can significantly reduce the buckling load.
41 citations
TL;DR: In this article, the effects of hydrostatic pressure, degassing, voltage magnitude and polarity on time lags to breakdown and the pre-breakdown phenomena in transformer oil were investigated using rectangular high voltage pulses and point-plane electrodes.
40 citations
TL;DR: Factor analysis was the most effective method for revealing correlations between bacterial characteristics and the environmental parameters; however, the use of a variety of methods provided more insight into the ecological aspects.
Abstract: The heterotrophic bacterial populations in two contrasting rivers have been examined over a period of 1 year. The populations were analyzed (i) as total heterotrophic counts, (ii) as species numbers, using numerical taxonomy, (iii) by diversity indices, and (iv) by factor analysis. Isolates were obtained by plating directly from water samples and by chemostat enrichment. Four factors emerged which profiled the bacterial community and were common to both rivers. They were, in order of decreasing importance, fermentative metabolism, inorganic nitrogen metabolism, fluorescence-oxidative metabolism, and lack of starch hydrolysis. Several factors produced significant correlations with a range of physicochemical parameters, which were also measured. The correlations suggested an intricate algal-bacterial interaction. The oxidative metabolism factor correlated with rainfall in one river, suggesting that the oxidative bacteria may be washed in from the surrounding land. In the other river, the oxidative-fermentative factor correlated negatively with sunshine. Factor analysis was the most effective method for revealing correlations between bacterial characteristics and the environmental parameters; however, the use of a variety of methods provided more insight into the ecological aspects.
37 citations
TL;DR: An unusual zwitterionic polar lipid component isolated from the halotolerant alga, Dunaliella parva Lerche, has been identified as 1(3),2-diacylglyceryl-3(1)- O -4′-(N, N, N -trimethyl) homoserine as discussed by the authors.
TL;DR: Two neighbouring areas of tholeiitic basalts, dolerites, isotropic gabbros and tonalites in eastern Jamaica are recognized as the upper section (~25 km thick) of an ophiolite Limestones associated with this Bath-Dunrobin Formation contain a fauna of Upper Campanian and Lower Maestrichtian age.
Abstract: Two neighbouring areas of tholeiitic basalts, dolerites, isotropic gabbros and tonalites in eastern Jamaica are recognized as the upper section (~25 km thick) of an ophiolite Limestones associated with this Bath-Dunrobin Formation contain a fauna of Upper Campanian and Lower Maestrichtian age The basalts are overlain by a thick sequence of Maestrichtian volcaniclastic rocks and are faulted against a blueschist terrain Since its emplacement the ophiolite has been subjected to uplift and major left-lateral strike-slip tectonism beginning in the Eocene Recognition of this subduction zone complex and regional considerations of island arc polarity necessitates that ocean crust must have been consumed by a southward-dipping subduction zone The overlying late Cretaceous/Palaeogene arc stretched from Guatemala through Jamaica to Oriente Province, Cuba This arc separated the Yucatan Basin to the N, where active spreading accompanied subduction, from the Colombian Basin and the southern Nicaraguan Rise to the SE, where tholeiitic magmatism (B") penetrated older ocean crust The Bath-Dunrobin Formation probably represents ocean crust from the Yucatan Basin obducted during the Maestrichtian The major ophiolite terrains of Guatemala and Oriente, Cuba are by inference also derived from a proto-Yucatan Basin
TL;DR: In this article, a conglomerate test using 36 clast cores (76 specimens) from the upper Precambrian Port Askaid Tillite of the Dalradian Supergroup in the Garvellach-Islay region of Scotland shows that the tillite was remagnetised during orogenic activity in Lower Ordovician time.
Abstract: A conglomerate test using 36 clast cores (76 specimens) from the upper Precambrian Port Askaid Tillite of the Dalradian Supergroup in the Garvellach–Islay region of Scotland shows that the tillite was remagnetised during orogenic activity in Lower Ordovician time. After 550°C thermal demagnetisation, the clast remanence directions give a mean of 155°, 14° (α95—12°). This is similar to the mean from four tillite matrix sites of 162°, 4° (α95—9°) and the mean ‘primary component direction’ of 166°, −12° (α95—6°) previously determined from the interbedded siltstones. This indicates that the matrix and siltstones were also remagnetised. These mean directions give virtual geomagnetic poles after tilt correction that fall within the cluster of British Ordovician poles from rocks in the Caledonian orogen, and thereby indicate a prefolding Ordovician age for the remagnetisation. Thermal demagnetisation studies and observations from polished and thin sections of tillite clast and matrix specimens show that secondary hematite derived from partially to completely altered magnetite is the dominant carrier of the metamorphic remagnetisation. These results show that remanence data from the Port Askaid Tillite cannot be used to support the hypothesis that a worldwide glaciation occurred during the Late Precambrian.
TL;DR: In this paper, the distance function derived by Kranz from a modular function is shown to satisfy the triangle inequality, and the structure of all modular functions on a lattice of finite height is determined.
Abstract: Modular functions on a lattice (m(x)+m(y)=m(x∪y)+m(x∩y)) live on modular lattices in that they are induced by modular functions on a quotient modular lattice. Those which identify pairs of the distributive inequality live on distributive lattices in the same sense. The structure of all modular functions on a lattice of finite height is determined. The “distance function” derived by Kranz from a modular function is shown to satisfy the triangle inequality.
TL;DR: In this article, the main feature of the method suggested in this paper is the assignment of priority to elements and priority elements are preferred to non-priority elements when assigning elements to stations.
TL;DR: In this article, the breakdown behavior of a 50 mm negative rodplane gap is investigated for N2, air, CO2 and their binary mixtures with SF6 for pressures of up to 0.5 MPa using rod of 0.794 mm radius and impulse voltages of 2/50
Abstract: Breakdown behavior of a 50 mm negative rod-plane gap is investigated for N2, air, CO2 and their binary mixtures with SF6 for pressures of up to 0.5 MPa using rod of 0.794 mm radius and impulse voltages of 2/50 ?sec. It is shown that at high gas pressures, mixtures containing low SF6 content can have breakdown voltages lower than the corresponding values in pure gases. Furthermore, the results indicate that SF6-CO2 mixtures perform somewhat better than SF6-N2 and SF6-air mixtures and can have breakdown voltages slightly higher than those for pure SF6. On the contrary, SF6-air and SF6-N2 mixtures have breakdown voltage levels which are always below their respective values for SF6. Furthermore, it is shown that when gas pressure is equal or higher than 0.1 MPa, leader-type corona exists in almost all of these mixtures. Also when the gas pressure and SF6 content of the mixture are high, leader discharge extends into the gap in a stepped manner. Detailed results of these investigations are described and discussed in this paper.
TL;DR: In this article, the cross sections for 4 2 P 1 2 -4 2 P 3 2 mixing in potassium, induced by collisions with noble gas atoms, were determined using the methods of fluorescence spectroscopy, at an optical depth of ≤3×10-2 in the absence of radiation trapping and at noble gas pressures in the mtorr region.
Abstract: Cross sections for 4 2 P 1 2 -4 2 P 3 2 mixing in potassium, induced by collisions with noble gas atoms, were determined using the methods of fluorescence spectroscopy. The experiments were carried out at an optical depth of ≤3×10-2 in the absence of radiation trapping and at noble gas pressures in the mtorr region and yielded the cross sections Q 1 (4 2 P 1 2 →4 2 P 3 2 ) and Q 2 (4 2 P 1 2 « 4 2 P 3 2 ) (in units of 10-16 cm2) respectively, as follows: for He, 26.3 and 17.8; for Ne, 6.4 and 4.4; for Ar, 16.0 and 11.2; for Kr, 24.9 and 17.7; for Xe, 44.9 and 31.7. These values supersede those reported previously by Chapman and Krause (1966).
TL;DR: Analysis of metabolism by measurement of respiratory quotient values indicates that reduced substances, such as lipids and/or amino acids, are the primary respiratory substrates of dormant and emerged myxamoebae of D. discoideum.
TL;DR: In this paper, a non-iterative, predictor-corrector form without matrix inversion and with improved accuracy is presented for solving nonlinear second-order coupled differential equations of the form y = F ( x, y ).
TL;DR: In this article, the relativistic and mass polarization corrections in the 1s3d 1 D 1 and 3 D 0,1,2 states were compared with high precision experiments for the fine structure splitting of 1s2p 3 P 0, 1, 2 states.
TL;DR: Two cAMP-independent protein kinases which phosphorylate casein were isolated from post-ribosomal supernatant of soybean cotyledons and were found to undergo autophosphorylation in the presence of ATP in preference to GTP in phosphotransferase reactions.
TL;DR: In this article, a method for the economic design of Cumulative sum (Cusum) control charts to maintain the current control of the process means, where the observations are independently, but non-normally distributed, is proposed.
TL;DR: In this paper, collisional deexcitation to the ground state (quenching) was investigated using atomic fluorescence spectroscopy and the experiments yielded the following cross sections Q10 (in A2) for collisional transfer 53P1→53P0: CdAr=2×10−3, Cd ǫ n2=8.0, cd à n 3261 A resonance radiation and the intensity of the resulting resonance fluorescence was monitored in relation to the gas pressures.
Abstract: Collisions of excited Cd 53P1 atoms were investigated using atomic fluorescence spectroscopy. Cadmium vapor, together with a quenching gas, was irradiated in a quartz fluorescence vessel with Cd 3261 A resonance radiation and the intensity of the resulting resonance fluorescence was monitored in relation to the gas pressures. The experiments yielded the following cross sections Q10 (in A2) for collisional transfer 53P1→53P0: CdAr=2×10−3, CdN2=8.0, CdH2=7.0, CdCO=15.6. The cross sections Q for collisional deexcitation to the ground state (quenching) in A2 are CdN2 = 2.6×10−2, CdH2 = 11.0, CdCO = 3.4, CdCO2 = 26.
TL;DR: An exact calculation of the hyperfine interaction tensor between a ligand nucleus and f electrons was carried out for: an 7 ion, an 13 ion, and for an f13 and an f1 ion in a crystal field environment with a tetragonal component.
TL;DR: In this paper, the authors provided data about West German expatriate managers' leadership attitudes and found that the managers' perceptions about their subordinates' qualifications are an important variable influencing participative management.
Abstract: This investigation provides data about West German expatriate managers' leadership attitudes. The results indicate that the managers' perceptions about their subordinates' qualifications are an important variable influencing participative management. In addition, regional location appears to influence the managers' attitudes concerning their subordinates.
TL;DR: In this article, a brief review of the charge simulation technique used for the calculation of high voltageelectrostatic fields, and its application to a typical transmission line disc insulator section under pollution-free conditions, is presented.
Abstract: A brief review of the charge simulation technique used for the calculation of high voltageelectrostatic fields, and its application to a typical transmission line disc insulator sectionunder pollution-free conditions, is presented. The use of ring and line charges has been found to be quite adequate for the modeling of the field distribution in and around the insulator with an accuracy in the representation of electrode potentials well within 1% of the maximum potential difference. The discrepancy in representing the inter-dielectric interface conditions is usually a maximum of about 9% but may be as large as 17% for the tangential electric field.
TL;DR: Populations of several co-existing species of Simocephalus were examined electrophoretically at 11 enzyme loci and the prevailing pattern was one of extensive allelic substitution between species and low levels of polymorphism within species.
Abstract: Populations of several co-existing species of Simocephalus were examined electrophoretically at 11 enzyme loci. The prevailing pattern was one of extensive allelic substitution between species and low levels of polymorphism (0-10%) within species. Genetic identity values between species were very low (10-50%). These results concur with those for other cyclic parthenogens, but are in sharp contrast to previous interpretation of data derived from populations of Simocephalus from the same sites.