Showing papers by "University of Windsor published in 1976"

Relativistic corrections to spin-forbidden electric-dipole transitions

Abstract: Theoretical results for spin-forbidden electric-dipole transitions have recently been questioned on the grounds that relativistic corrections to the transition operator were not included. It is shown here that these corrections are automatically included when the transition operator is expressed in the dipole length form. The above criticism of previous dipole-length calculations is therefore unfounded. The 1s2p 3P1-1s2 1S0 and 1s2p 3P1-1s2s 1S0 transitions of helium are discussed as specific numerical examples.

Theoretical oscillator strengths for some transitions in Si(II), Ge(II), Sn(II) and Pb(II) spectra

Abstract: Calculations are reported of non-relativistic and relativistic oscillator strengths for the principal, sharp and diffuse series as well as some lifetimes in the spectra of singly-ionized silicon, germanium, tin and lead. The radial integrals were computed by employing the wave functions obtained from a semiempirical approach which included exchange effects (the semiempirical X α method). Good agreement was obtained with available experimental and theoretical data. A comparison between non-relativistic and relativistic oscillator strengths confirms the importance of the spin-orbit interaction of the optical electron, as well as other relativistic effects for the oscillator strengths, even for the spectra of moderately heavy ions. Some systematic trends in the calculated oscillator strengths and line-strength ratios were investigated along the spectral series, as well as along the sequence of homologous ions.

Field desorption mass spectrometry of phospholipids. II--Fragmentation of dipalmitoylphosphatidyl choline from comparison of d0, d4 and d9 species.

Abstract: Field desorption mass spectra have been obtained for dipalmitoylphosphatidyl choline-d0, -d4 and -d9. The two latter compounds were synthesized from dimethylene-d4 choline bromide and trimethyl-d9 choline bromide, respectively. Comparison was made of spectra of these three compounds obtained at different field anode temperatures in order to establish the composition of the major cleavage, rearrangement, and association ions. At low anode heating currents (less than or equal to 20 mA) the most intense peak is [M + 1]+ which accounts for c. one-third of the total ionization. At higher temperatures various fragmentation processes, some of which are without analogy in electron impact mass spectrometry, become more important. The presence of an intermolecular methyl transfer process had been confirmed.

Static field anode corona characteristics in sulphur hexafluoride

Abstract: This paper reports the results of an experimental investigation of the static field anode corona characteristics in SF 6 over a wide range of gas pressures and field non-uniformities. In addition to the experimental study the theoretical streamer onset voltages of the various test gap geometry-pressure configurations were calculated and these are compared with the experimentally determined breakdown voltages and onset levels of the various stages of prebreakdown current activity. Also discussed is a method of estimating the minimum gas. pressure at which breakdown occurs in the absence of positive DC corona in a non-uniform field.

Numerical solutions to two-body problems in classical electrodynamics: Head-on collisions with retarded fields and radiation reaction. I. Repulsive case

Abstract: Classical trajectories of two particles with like charges have been computed numerically for head-on collisions. The trajectories are physical solutions of the Lorentz-Dirac equation with retarded fields. To eliminate runaway solutions, the third-order equation has been integrated numerically backward in time. Results are presented both for the static case (one particle is infinitely massive) and for two particles of equal mass. In the latter case, iterations are required in order to obtain self-consistent trajectories. Compared to results with the Lorentz equation, in which radiation reaction is ignored, maximum accelerations are markedly smaller, distances of closest approach are larger, and there is a small loss in particle energy rather than a large gain. No evidence was found for a lower bound on the distance of closest approach or for an upper bound on the radiated energy.

Religious Recruitment and the Management of Dissonance: A Sociological Perspective*

Abstract: While religious organizations are not concerned with cognitive dissonance, per se, their concerns with acquiring new members maintaining member beliefs, obtaining member commitments and deterring members from leaving are all affected by their abilities to manage (avoid, tolerate and exploit) dissonance experienced by those persons Conceptualizing dissonance as a socially negotiable phenomenon, a sociological version of dissonance is examined in the context of religious recruitment

Cirque morphometry in the canadian cordillera

Abstract: Cirques in the southern Canadian Cordillera are most numerous at lowest elevations and best developed on the north and northeastern flanks of mountains. Cirques at the heads of major valleys are generally at higher elevation, and are larger in area than cirques along the sides of valleys. The elevation frequency distribution is different for various types of cirque. Cirques which are well below mean cirque elevation are large and are almost always oriented to the north and northeast. Cirques well above mean cirque elevation are small and independent of orientation. A model is proposed in which cirque morphometry varies in a vertical plane in relation to the position of the snowline, and in a horizontal plane in relation to orientation.

Tin-bearing potential of some Devonian granitic rocks in S.W. Nova Scotia

Abstract: Petrological indices and major element chemistry may be used to select individual plutons within a batholith which are most likely to be tin bearing. The origin and evolution of only the selected individual plutons may be assessed using trace elemental contents and dispersions, (Rb, Ba, Pb, Zn, Mo, Li, Be, F, and W) and selected elemental ratios, K/Na, Ba/Rb, (Li × 1000)/K, Li/Zn, and F/Li. This information may also be used to assess the ore bearing potential of the plutons. The method has been applied to three plutons within the South Mountain Batholith of Nova Scotia, using 75 whole rock major and trace element analyses. The results suggest that only the New Ross Pluton, in which several tin prospects are known, might be ore bearing. All the plutons are considered to be deeply eroded and any economic cassiterite deposits have probably been removed by erosion.

Tin (IV) Chloride Solution as a Sensitizer in Photoselective Metal Deposition

Abstract: Experiments were conducted which show that Sn(IV) bound to a substrate is capable, in conjunction with Pd(II), of catalyzing Ni‐P plating and that this effect can be inhibited by u.v. light. Some of the parameters affecting the quality of the plating and u.v. inhibition were determined. It was also found that in order for u.v. irradiation to inhibit Ni‐P plating, the radiation must be applied after the Pd(II) activation step. In the case of copper, however, plating occurs only on the irradiated area of the catalyst. A mixture of Sn(IV) and Pd(II) was also found to catalyze Ni‐P plating. The behavior of the catalyst deposited by this mixture was quite similar to that of the catalyst present after Pd(II) activation following Sn(IV) sensitization in the stepwise procedure.

A Round-Trip Location Problem on a Tree Graph

Abstract: The problem considered is to locate one new facility with respect to a finite number of pairs of existing facilities on, a tree graph, which typically represents a road network, so as to minimize the maximum cost, where cost are linear increasing functions of the round-trip distance a vehicle based at the new facility travels via a pair of existing facilities. Based on an attainable lower bound for the minimax problem, an algorithm is developed that yields all optimal solutions to the problem.

On a spherical star system with a collapsed core

Abstract: Exact solutions of Einstein's equations for a perfect fluid that describe the gravitational collapse of matter around a collapsed core are presented. The collapsed region grows monotonically until an absolute Schwarzschild horizon is formed. It is found that the minimum redshift of light emitted radially from the boundary of the system and received at infinity is approximately 4.62. These systems are expected to describe the very last stages in the gravitational collapse of a globular star cluster with a central collapsed core.

Spore germination in Dictyostelium discoideum. II. Effects of dimethyl sulfoxide on post-activation lag as evidence for the multistate model of activation

Abstract: Mutant spores of Dictyostelium discoideum, strain SG-10, differ from wild type spores in their ability to spontaneously germinate, to be activated with 5% Dimethyl Sulfoxide (DMSO), and to be deactivated with 0.2 M sucrose. Both heat-activated wild type and mutant spores began to swell after a lag of 60-75 min at ambient temperature. Suspension of heat activated spores in 5% DMSO resulted in blockage of spore swelling and a concomitant severe inhibition of respiration; removal of 5% DMSO allowed resumption of respiration and the spores began to swell after a lag of only 15 min. It was concluded that 5% DMSO allowed the early reactions (M) to proceed but blocked the later reactions (R) of post-activation lag. Treatment of one day old spores with 20% DMSO solution for 30-120 min quantitatively activated the population. The post-activation lag time was directly dependent on the time of 20% DMSO treatment. Spores activated with 20% DMSO treatment could be deactivated by incubation at 0 degrees C; the spores most quickly deactivated at 0 degrees C were those within 10 min of swelling. Mitochondrial transport inhibitors such as azide and cyanide caused deactivation in an analogous manner. It is hypothesized that spores proceed to the second portion of the lag phase called (R) before the environment determines if dormancy is reimposed or if germination will proceed. The sensitive strain (SG-10) showed a greater degree of "damage" than the wild type after supraoptimal treatment with 40% DMSO. The spores became more resistant with age to the "damaging" action of 40% DMSO. All the observed effects of DMSO treatment were compatible with our multistate model of activation which suggests that the early portion of the lag phase (M) may involve a relative uncoupling of oxidative phosphorylation while the later portion (R) may require tight coupling.

Review of blastogeny in palaeozoic corals and description of lateral increase in some Upper Ordovician rugose corals

Abstract: Almost all blastogeny in colonial rugose and tabulate corals involves lateral increase. Axial increase is rare and peripheral increase, which uncommonly occurs in both solitary and colonial corals, is regarded as a multiple type of rejuvenescence. Coenenchymal increase is known only in heliolitid corals. During lateral increase in fasciculate and massive colonies, offset and parent are separated by either a partition which is interpreted as formed by a continuous sheet of basal ectoderm between offset and parent polyps, or by a dividing wall which is formed by two entirely separate polyps. Lateral increase in species of Favistina and Palaeophyllum from the Upper Ordovician of eastern North America involves offsets which are separated from the parent coralIite by a dividing wall. Axial planes of the offsets are oriented towards the axis of parent corallites, with the counter septum located on the peripheral wall. Septal insertion in general shows a rugosan pattern. Tertiary septa are present in two specImens of Palaeophyllum.

Recurrence relations for the moments of truncated multinormal distribution

Abstract: In this paper some recurrence relations of moments of doubly truncated multivariate normal distribution are obtained. The bivariate case is given as an example and some applications are indicated.

Theoretical oscillator strengths for some transitions in P(III), As(III), Sb(III) and Bi(III)

Abstract: Relativistic as well as non-relativistic oscillator strengths have been calculated for transitions in the principal sharp and diffuse series of P(III), As(III), Sb(III) and Bi(III) spectra. The radial integrals were computed by employing the wave functions obtained from a semiempirical method which included exchange effects. A comparison is presented for our calculated f ik values with experimental and other theoretical data. The influence of relativistic effects on oscillator strengths for transitions in the P(III) through Bi(III) homologous sequence is discussed.

Measuring the Sense of Political Efficacy in Canada Problems of Measurement Equivalence

Abstract: ttempts to establish the validity of certain essential measures of A political attitudes have not infrequently called into question assumptions about measurement equivalence in comparative studies, even in those employing a “most similar systems” design. Indeed, when attention is directed away from the construction of measures themselves and toward identification of the phenomena being measured, it is often found that measurement equivalence cannot be assumed even between subgroups of a single population, but rather must be treated as an empirical question subject always to testing (Przeworski and Teune, 1970:

Quantum beats in the electric-field quenching of metastable hydrogen

Abstract: The strong field-induced quantum beats observed in beam-foil studies of Ly- alpha radiation are obtained in a conventional metastable-hydrogen quenching experiment. The phase relation between the Stark shifted 2s1/2-2p1/2 Lamb-shift oscillations and the much more rapid 2s1-2p3/2 fine-structure oscillations depends on the detailed way in which the quenching field is switched on. Apart from a phaseshift, the results agree with a non-perturbative theoretical calculation which assumes that the field is applied suddenly. Various frequency components of the time-dependent radiation intensity are identified with specific hyperfine transitions or groups of transitions. No adjustable parameters are used for the initial state amplitudes.

Depolarization of 6 P 3 2 2 cesium atoms, induced in collisions with noble gases

Abstract: Cross sections for relaxation of circular and linear polarization of $6^{2}P_{\frac{3}{2}}$ cesium atoms, induced in collisions with ground-state He, Ne, Ar, and Xe, have been determined by Zeeman scanning techniques. A fluorescence cell containing low-pressure cesium vapor together with a buffer gas was irradiated with circularly or linearly polarized 8521-\AA{} Cs resonance radiation, producing excited and polarized Cs atoms which became depolarized in subsequent collisions with the buffer-gas atoms. The resulting depolarization of the cesium resonance fluorescence was monitored in relation to buffer-gas pressure (0-10 Torr) and to the strength of the ambient magnetic field (0-10 kG). At low fields at which the nuclear spin $\stackrel{\ensuremath{\rightarrow}}{\mathrm{I}}$ is coupled to the electronic angular momentum $\stackrel{\ensuremath{\rightarrow}}{\mathrm{J}}$, the measurements yielded depolarization cross sections $Q(\mathrm{circ}.)$ and $Q(\mathrm{lin}.)$, which agree within experimental error with theoretical values calculated for spin-coupled conditions. At kilogauss fields with $\stackrel{\ensuremath{\rightarrow}}{\mathrm{I}}$ and $\stackrel{\ensuremath{\rightarrow}}{\mathrm{J}}$ decoupled, the experiments produced cross sections for disorientation and disalignment, which are also in satisfactory agreement with the appropriate theoretical predictions. The results indicate that the nuclear spin has a more pronounced effect on the collisional relaxation of the atomic dipole than of the quadrupole.

Physiochemical characterization of proteolytic cleavage fragments of bovine colostral immunoglobulin G1 (IgG1).

Abstract: Normal bovine colostral immunoglobulin G1 was subjected to enzymic digestion (pepsin, papain and trypsin) and the resulting fragments separated by a combination of molecularsieve and phosphocellulose chromatography.Fragments F(ab')2 derived from peptic digestion, fragment Fab from papain digestion and fragment Fab(t) from tryptic digestion showed complete antigenic identity with each other. Although fragment F(ab')2 (peptic digestion) had a sedimentation coefficient (S2o,w) of 5.3S, those for fragments Fab' (peptic digestion), Fab (papain digestion) and Fab(t) (tryptic digestion) were found to be 3.9S, 3.7S and 3.7S respectively. The mol.wts. calculated for the various fragments from the sedimentation equilibrium data were: F(ab')2, 104000 +/-200; Fab', 51900+/-340; Fab, 50900+/-230; Fab(t) 50900+/-300. Fragment Fc' (peptic digestion) had an S20,w of 3.2S and a mol. wt. of 42900+/-650; fragment Fc (papain digestion) had an SI0,w of 3.7S and a mol.wt. of 50800+/-300; fragment Fc(t) had an S20,w of 3.7S and a mol.wt. of 50800+/-300; fragment Fc(t) had an S20,w of 3.7S and a mol.wt. of 50800+/-450.

Public Opinion and Foreign Policy Options in Canada

Abstract: This article examines the role of public opinion in Canada's attempt to lessen its dependence on the United States and seek closer ties with European and Asian countries. Employing national survey data collected over a three-year period, the authors argue that widespread public support for new directions in foreign policy has not developed in Canada in spite of the climate of increasing nationalism and the shift in government policy. Attitudes toward the problem of foreign investment, domestic economic issues, trade agreements, and Canadian participation in international peacekeeping forces are also reported. J. Alex Murray is Visiting Professor of International Business, UCLA, and Lawrence LeDuc is Professor of Political Science at the University of Windsor, Windsor, Canada. Both are members of the International Business Studies Research Unit at the University of Windsor. POQ 40 (1976-77) 488-496 This content downloaded from 157.55.39.117 on Fri, 15 Jul 2016 05:41:59 UTC All use subject to http://about.jstor.org/terms PUBLIC OPINION IN CANADA 489 As is more often the case in the making of foreign policy than in most other areas of public policy, public opinion has not played a large role either in the development of the third option or in the discussion and commentary which it has received. Indeed, it is generally argued that, in the area of foreign affairs, public opinion tends to follow rather than precede the formulation of policy. While this is undoubtedly true with regard to specific elements of policy, it can often be shown that foreign policy, like other areas of public policy in a democratic society, is responsive over time to changes in public "mood" or climates of opinion.2 Interestingly, Mr. MacEachen referred quite explictly to the climate of public opinion as part of the rationale for the third option in his January 1975 Winnipeg speech when he stated (MacEachen, 1975): This new feeling of being Canadian is reflected sharply in the economic field. The issue is our economic independence. I have already cited figures showing the degree to which we are dependent on the United States in trade and investment. A cross section of various polls taken in 1972 indicated that 88.5% of Canadians thought it important to have more control over our economy and that two out of every three Canadians considered the then level of American investment as too high. It is the purpose of this article, therefore, to explore, with the aid of our national public opinion survey data,3 the climate of opinion in Canada with regard to economic nationalism and some specific aspects of the third option in Canadian foreign policy. Our surveys, together with those of CIPO (Gallup) and other organizations, have unmistakably documented the growing climate of nationalism in Canada in recent years, particularly with regard to economic matters. For example, Gallup has found that the percentage of Canadians who feel that there is "too much U.S. influence in the Canadian way of life" has risen from 29 percent in 1956 to 58 percent in 1974 (CIPO, 1974). More specifically in the area of economic policy, our own surveys have found that the proportion of the population who feel that U.S. investment in Canada is overall "a bad thing" has increased from 36 percent in 1969 to a high of 55 percent in 1973. While this statistic leveled off slightly in our most recent (1975) survey, it remains at a high level of 51 percent of the total sample (see Figure 1). The suggestion of a linkage between the third option policy and this 2 For a general discussion of the role of public opinion in the development of foreign policy, see Rosenau (1961). See also Farrell (1969) and Thorardson (1972) for a discussion of particular domestic considerations in Canadian foreign policy. 3 The surveys discussed in this paper are conducted annually by the International Business Studies Research Unit (University of Windsor), and Elliott Research Corporation. The 1975 survey was based on a national quota sample of 4,000 respondents, controlled for province, urban-rural location, age, and sex. Earlier surveys were based on similarly constructed samples of 5,000 respondents. The surveys are conducted in the fall of each year. Data for each of the past annual surveys for the period 1969-1975 are held on tape by the International Business Studies Research Unit (University of Windsor). Some reports based on data from these surveys are: Murray and Gerace (1972) and Murray and LeDuc (1975). This content downloaded from 157.55.39.117 on Fri, 15 Jul 2016 05:41:59 UTC All use subject to http://about.jstor.org/terms

Calculated anisotropies for the quenching radiation in the hydrogen isoelectronic sequence

Abstract: Accurate values of the Lamb shift can be derived from measurements of the anisotropy in the angular distribution of the radiation accompanying the electric field induced 2s-1s transition of hydrogen. Calculations of the anisotropy, including relativistic and hyperfine structure corrections, are presented for the hydrogenic ions up to S/sup 15+/. The data enable the calculation of the Lamb shift from a measured value of the anisotropy. (AIP)