Showing papers by "University of Windsor published in 1970"

Second Bound State for the Hydrogen Negative Ion

Abstract: It is frequently stated that the $1{s}^{2}^{1}S$ state is the only bound state of ${\mathrm{H}}^{\ensuremath{-}}$, although Hol\o{}ien estimated that the $2{p}^{2}^{3}P$ state may also be bound. We show by a variational calculation that the $2{p}^{2}^{3}P$ state is definitely bound below the $n=2$ threshold of hydrogen. The best eigenvalue obtained is -0.125350 a.u.

Self-coupled scalar gravitation.

Abstract: The requirement in scalar theories of gravitation that the source of the field includes the trace of its own stress tensor is investigated in two models: (1) The geometrical Nordstr0m theory, which is the conformally flat metric analog of Einstein's theory. (2) The ostensibly non-geometrical flat space system of Freund and Nambu. Both are derived in closed form as cubic self-interacting systems and shown to be equivalent.

Permalloy thin-film inductors

Abstract: The design of an integrated thin-film inductor suitable for use at 10 MHz is described, and some operational characteristics are given. The inductor has the shape of a square spiral and is surrounded by permalloy thin films according to a certain pattern. This pattern allows these films to be driven in the hard direction and thus utilises the hard-direction permeability which is quite large (?2700).

Thermomechanical treatment and transformation characteristics of Fe-Mn austenites

Abstract: The effect of thermomechanical treatment on the tensile properties of metastable manganese austenites was determined, and deformation-induced transformation characteristics were analyzed by X-ray diffraction and by data derived from stress-strain curves. An improved combination of tensile strength and ductility is obtained through a processing treatment entailing ausforming and deformation-induced transformation. The two treatments are very strongly interrelated, the first imposing some limiting factors on the latter. After small ausforming deformation, the strain-induced austenite-to-martensite transformation at room temperature is slightly stimulated, but additional increments of austenite deformation have a strong retarding effect. It is concluded that the formation of a strong martensite in a work-hardened austenite matrix is most effective in enhancing strength and ductility.

Ground State of Liquid He 4

Abstract: A trial wave function describing the ground state of a quantum system of $N$ interacting bosons is written in the Jastrow form, a product of pair functions. With the interaction potential chosen to represent liquid ${\mathrm{He}}^{4}$, and with the parametrized form of the pair function chosen to include a long-range term which has been found necessary to represent the zero-point motion of the long-wavelength density oscillations, a variational calculation has been performed using a new approximate integral equation for the pair distribution function. This equation, which can also be used for classical fluids, is found to be more accurate for repulsive potentials than the Percus-Yevick equation and comparable to (but much simpler than) the Percus-Yevick 2 equation. The essential results are that including the zero-point motion in the wave function tends to lower the energy, raises the equilibrium density, corrects the behavior of the structure function and the momentum distribution of the particles in the low-wave-number region, and slightly decreases the Bose-Einstein condensate fraction. The value of the lower limit on the wavelength of the density oscillations was determined variationally to be about three interparticle spacings.

Variational Approach to Non-Darcy Flow

Abstract: The principles of variational calculus are applied to solve the nonlinear partial differential equation for steady and unsteady unconfined non-Darcy flow through porous media. A functional is proposed which will yield solutions for the laminar, transitional and turbulent flow regimes. The solution represents the minimization of the rate of energy dissipation with enforced flow continuity. A finite element scheme is used to obtain the minimizing field. Examples of the method applied to steady and unsteady free surface flow is described in a rectangular rockfill section. The finite element and experimental flow fields are in good agreement.

Deformation substructure and strain-hardening characteristics of metastable Fe-Mn austenites

Abstract: The 500° and 550°C strain-hardening characteristics of manganese austenites based on Fe-14 pct Mn-0.4 pct C with carbide forming elements (Cr, V, Mo), were determined and deformation substructures were examined by transmission electron microscopy. Of the carbide formers investigated, molybdenum is the most effective in enhancing the strain-hardening rate of manganese austenite, followed closely by vanadium. The effect of chromium is relatively small. The effectiveness of carbide formers is independent of the strain-induced precipitation reaction, though this varies greatly in extent. Examination of thin foils revealed widely extended stacking faults which persist after heavy deformation, indicating a low stacking fault energy. It is tentatively suggested that the essential role of molybdenum, vanadium, and chromium is to progresively lower the stacking fault energy of a manganese austenite, and thereafter enhance its strain-hardening rate. The lower stacking fault energy postpones cross-slip and, as a result of stacking fault-dislocation interaction, increases the dislocation density and strain-hardening rate. It is concluded that the precipitates play only a minor role in strain-hardening manganese austenites.

Critical Shear Loading of Curved Panels of Corrugated Sheets

Abstract: The problem of buckling of curved shear panels of corrugated sheets, which is encountered in the design of long shells is examined theoretically. Overall panel buckling, and not local buckling, is analyzed. Thus, the corrugated sheets are treated as orthotropic curved plates. Equilibrium conditions, as well as geometric and elastic relations of a deformed infinitesimal element, are governed by two linear simultaneous coupled differential equations in deflection w and stress function F . Series presentation for w and F yielded a set of homogeneous linear algebraic equations in the unknown deflection coefficients. A nontrivial solution of these equations is possible provided that the determinant of their matrix is equal to zero. The eigenvalues of the shear load are calculated and only the lower value is considered. The few experiments available show reasonable agreement with the theoretically obtained ones. For practical use, curves are given for the calculation of critical shear load.

Application of sequential pattern-recognition technique to medical diagnostics.

Abstract: This paper systematically demonstrates how a new sequential pattern-recognition technique can be used for computer diagnosis assessment. According to this technique it is possible to identify the patient's disease on the basis of information obtained by sequential analysis of symptoms by which the disease is manifested. Since the symptoms are analysed sequentially, the information that is needed for obtaining a unique diagnosis can be effectively minimised. The techique also enables one to develop a special program specifying the optimal direction of clinical investigation. This program determines at any particular stage of the diagnostic procedure which kind of clinical tests would yield at any given moment the diagnostically most discriminative data and should be consequently carried out with the highest priority. The amount of time and the number of clinical examintations required for the identification of any particular disease can thus be effectively reduced.

Effect of drive level on habit strength in a discrimination task

Abstract: Effects of drive level on habit strength of a brightness discrimination were determined for male albino rats. Habit strength was assessed by measuring response strength of the old stimulus, compared with a newer trained redundant positive cue. Only in one type of test trial was a drive effect on habit strength found. Moderately water-deprived Ss (MOD), regardless of drive level during redundant cue training or testing, preferred the redundant cue to the positive stimulus. Highly deprived Ss (HI) showed no preference, but responded more to the older positive stimulus than did MOD Ss. These results support the hypothesis that habit strength is directly related to drive level. The specific conditions under which drive level effects on learning could be most easily observed were discussed.

3-thianaphthenoyltrifluoroacetone: a new reagent for the spectrophotometric determination of cerium(iv).

Abstract: A visible spectrophotometric method is described for the determination of cerium(IV) with 3-thianaphthenoyltrifluoroacetone. The effects due to pH, time, solvents, reagent concentration and diverse ions are reported. Beer's law is obeyed and the molar extinction coefficient is 5.51·103 at 424 nm.

Simple Reaction Time in “Brain-Damaged” and Normal Children under Regular and Irregular Preparatory Interval Conditions

Abstract: Two different reaction-time conditions were employed to explore differences in “mental set” between 2 groups of children: one with anamnestic and/or electroencephalographic evidence of cerebral dysfunction (the “brain-damaged” group); the other, a control group of normal children. There were 15 boys in each group. The groups were matched for age and IQ. The procedure consisted of regular and irregular preparatory interval conditions. The results demonstrated that latency was directly related to length of preparatory interval for the normals but not for brain-damaged Ss. No clear separation between normal and brain-damaged Ss was obtained when the set-index formula was employed. However, when ages 8 through 10 were analyzed separately, a good separation could be obtained.

Spectrophotometric determination of cobalt with 2,2′-Pyridilmonoxime

Abstract: A visible spectrophotometric method is described for the determination of cobalt with 2,2′-pyridilmonoxime. The effects due pH, time, solvents, reagent concentration and diverse ions are reported. Beer's law is obeyed and the molar extinction coefficient is 1.7 · 104 at 408 nm. A reasonable structure for the cobalt chelate based on analysis and infrared evidence is proposed.

Pyridine ketoximes as analytical reagents: The α and β isomers of 2,2′2-dipyridylglyoxime

Abstract: The preparation, separation, and characterization of the α andβ isomers of 2,2′-dipyridylglyoxime are described. The α andβ configurations are assigned on the basis of NMR, IR, and chemical data. In addition, a method of assessment of purity is given.

The paradox of radiation from a uniformly accelerated point electron and a consistent physical framework for its resolution

Abstract: We study the problem of an electron in an external, uniform electric field. The problem is analyzed within the framework of a new theory of Maxwell electrodynamics in which the problems and paradoxes of infinite self-energies are omitted by considering only the interactions between charged particles as the basic building blocks of the theory. For this case of uniform acceleration, the manifest consistency and physical transparency of this new electrodynamic formalism allows a simple and physically clear interpretation to be ascribed to the ‘acceleration energy’, and the role it plays in acting as the source of the energy which is radiated from the accelerated charge. The relationship of the acceleration energy to the internal energy of the electron is clarified in terms of the ‘total coupled radiation field’ of the system. At the same time the new formulation of electrodynamics is shown to represent a completely consistent theory of a classical electron in an external field, which in many aspects is a superior alternative to either Maxwell-Lorentz theory or Wheeler-Feynman theory.

On the general relativistic boltzmann equation

Abstract: The use of the co-ordinate time as an evolutionary parameter permits a formulation of the one-particle general relativistic mechanics which is in close analogy to the classical one. From this formulation one can write the Boltzmann equation in the presence of a gravitational field in a form similar to the classical case. Applications are worked out for specific examples. The corresponding fundamental equations for fluid dynamics are derived from the moment equations.

An Analysis of the Guerrilla Insurgency and Coup D'État as Techniques of Indirect Aggression

Abstract: There is a critical relationship between the major forms of domestic political violence common to developing nations and techniques of indirect aggression-the increasingly important vehicle of Cold War great power conflict in the so-called "third world." As a means of analyzing this relationship, both the domestic and international politics of the developing areas will be considered as varieties of the general phenomenon of political violence. Using political violence as a common schematic frame of reference, it is interesting to note that we discover a convergence of domestic and international politics, which have traditionally been identified in political science literature as two fairly distinct spheres, into what appears to be a single model of politics. In the classical breakdown of political science into the areas of comparative government and international relations, we find a basic difference in the way in which violence is related to the political process. In the analysis of domestic politics, great stress is laid on the alleged monopoly of coercive force centered at the governmental level.' On the other hand, in the analysis of the international