Showing papers by "University of South Carolina published in 1969"
TL;DR: In this article, a covariant four-vector position operator is proposed, which form a natural operator generalization of the four-position in relativistic classical mechanics, and the connection with the standard theory of half-integral spins is made via specific field equations.
Abstract: Covariant four-vector position operators ${X}^{\ensuremath{\mu}}$ are proposed, which form a natural operator generalization of the four-position in relativistic classical mechanics. These ${X}^{\ensuremath{\mu}}$ are defined by specifying commutation relations of the ${X}^{\ensuremath{\mu}}$ with the Poincar\'e generators ${P}^{\ensuremath{\mu}}$ and ${M}^{\ensuremath{\mu}\ensuremath{
u}}$, and thereby extending the Poincar\'e algebra to a larger algebra whose representations are subsequently found. The ${X}^{\ensuremath{\mu}}$ are shown to be acceptable relativistic position operators within a proper-time dynamical framework. A single Hamiltonian is used for all spins, with a covariant proper-time description. The dynamics is capable of describing the time evolution of states which are not mass eigenstates. An automatic Foldy-Wouthuysen-type diagonalization is achieved for all spin representations, with spin and orbital angular momentum being separately conserved. The connection with the standard theory is made via the specific field equations. In making this connection to the standard theory of half-integral spins, the origin of Zitterbewegung and the nonseparate conservation of spin and angular momentum are clarified. The connection to Maxwell's equations provides an interesting statement of those equations and of gauge invariance. The unphysical representations of negative and imaginary mass and continuous spin are not present in this formalism. Other features are discussed.
62 citations
TL;DR: In this article, the infrared spectra of silacyclopentane and 1,1-dideutero-1-silacyclopsentane in both the gaseous and liquid states were recorded from 4000 to 33 cm−1.
54 citations
TL;DR: Megasporogenesis in 16 species of Papilionaceae has been investigated and several variations in tetrad patterns are explored here.
Abstract: Megasporogenesis in 16 species of Papilionaceae has been investigated. Archesporial development in Papilionaceae is usually hypodermal, but subhypodermal origin has been observed. The archesporial cell develops directly into the megasporocyte, or divides to produce a parietal cell and a primary sporogenous cell. The parietal cell is always oriented toward the micropylar end of the developing ovule. It may or mnay not divide to contribute to the nucellar mass as the primary sporogenous cell enlarges to form the megasporocyte. A single megasporocyte is produced in most species investigated. Of those species that form more than one megasporocyte, few develop more than one tetrad of megaspores, and in no case is more than one megagametophyte produced. Meiosis occurs in the megasporocyte to form a tetrad of megaspores. Several variations in tetrad patterns are explored here. Monosporic development is the prevalent condition in Papilionaceae; however, bisporic development does occur. A CONSIDERATION of relationships and phylogenetic trends within flowering plant families using embryological data is today becoming an important tool supplementing other taxonomic information. The validity of these considerations has been expressed by several authors (Ma
32 citations
TL;DR: In this paper, the authors used the valence force field model to calculate the frequencies and potential energy distribution of trimethylchlorogermane in infrared and Raman spectra.
31 citations
TL;DR: In this article, the cyclopentadienyl ring breathing frequency was found to be associated with the strong sharp Raman line at 1117 cm −1, and force constants calculated for the carbonyl stretching vibrations were comparable to those of similar π-bonded metal carbonyls.
30 citations
TL;DR: In this article, the infrared spectrum of 3-butenenitrile, CH 2 CH-CH 2 CN in the liquid, gaseous and solid states has been recorded from 4000 to 100 cm −1.
29 citations
TL;DR: In this paper, the infrared and Raman spectra of chlorocyclopentane, bromocyclophane, and α-bromophane-d 1 were recorded and the fundamentals assigned.
27 citations
TL;DR: The results of the hydrogenation experiments indicate that the helical conformations of the poly-S-amino acid carriers influence the asymmetric induction observed as discussed by the authors, and the results show that the results of these experiments are consistent with the results reported in this paper.
24 citations
TL;DR: The infrared spectra of cyclo butanol, α-cyctobutanol, d 1, β,β,β',β'- cyclobutanol- d 4 and α,ββ, β',β', β'- cycloc butanol-d 5 have been measured from 4000 to 250 cm −1.
24 citations
TL;DR: The glycogen content of the fat body of Phormia regina increased nearly ninefold during third-instar development and represented 8·9–10·9 per cent of the total fat body dry weight.
22 citations
TL;DR: A summary of research on characteristics of effective counselors in terms of indicators that show promise as predictors of counselor effectiveness as well as indicators that appear to possess little or no such promise is given in this article.
Abstract: A summary is given of research on characteristics of effective counselors in terms of indicators that show promise as predictors of counselor effectiveness as well as indicators that appear to possess little or no such promise. Recommendations are made for the use of these findings in research and practice.
TL;DR: Results indicate that the helical conformation of the polyamino acid carriers does influence the asymmetric induction observed, and the chirality of the screw sense of the Poly-S-leucine appears to have a stronger influence on the configuration of the products than does the asymmetrical induction arising from the configurations of the amino acid residues.
TL;DR: The traditional separation of explanations of collective behavior and routine social behavior is examined in this article, where participants' reports of the initiation and development of an elementary form of collective behaviour are presented.
Abstract: The traditional separation of explanations of collective behavior and routine social behavior is noted. Blumer's work is examined as representative of and influential in maintaining this separation. Participants' reports of the initiation and development of an elementary form of collective behavior are presented. This case study records repeated examples of the processes Blumer and others have restricted to routine social behavior and thus challenges the separation they have maintained. These data are used to illustrate some rudimentary principles which are applicable to the production, maintenance, and alteration of lines of social behavior in routine and collective behavior settings.
TL;DR: The minor hemoglobin component A2, present in crystalline hemoglobin, is removed by a batch procedure of adsorption on DEAE cellulose and fractionation by elution under conditions determined by column chromatography.
TL;DR: In this paper, the Raman spectra of O,O-dimethyl phosphorochloridothioate have been recorded in the liquid and solid phases, indicating the presence of at least two rotational isomers.
TL;DR: In this paper, the spectral properties of the series (C 6 H 5 ) 3 GeX (where X is bromine, chlorine, fluorine, hydrogen and deuterium) have been recorded from 4000 to 33 cm −1.
TL;DR: In this paper, the effects of intertrial activity and locus of control orientation (internal or external) on verbal operant conditioning (VOC) were investigated and it was hypothesized that inter-trial activity which required Ss to verbalize continuously during the intertrial interval would interfere with VOC, as well as reduce the frequency of post experimentally assessed awareness among Ss.
Abstract: Forty-eight male undergraduates participated in an experiment designed to investigate the effects of intertrial activity and locus of control orientation (internal or external) on verbal operant conditioning (VOC). It was hypothesized that intertrial activity which required Ss to verbalize continuously during the intertrial interval would interfere with VOC, as well as reduce the frequency of post experimentally assessed awareness among Ss. Both of these hypotheses were confirmed. In addition, it was hypothesized that intertrial activity would produce greater decrements in the performance of internals than externals. Exactly the opposite pattern of findings was obtained.
TL;DR: In this article, the IR spectra of the series (C6H5)2GeX2 (where X is H, D, Cl and Br) have been recorded from 4000 to 33 cm−1.
TL;DR: Several tetrachlorometallate (MCl 4 − x ) complexes have been prepared in benzene by reacting the solid metal salts with a solution of a long-chain, high molecular weight quaternary salt or an amine hydrochloride as mentioned in this paper.
Journal Article•
TL;DR: In this paper, the authors have provided a link page download that the book that you refer so much can be found, just save the requested book downloaded and then you can enjoy the book to read every time and place you want.
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TL;DR: In this paper, the Konstanten der potentiellen Energie fur Tetramethylverbindungen and-ionen der Elemente der 4. and 5. Gruppe, besonders des C, Si, Ge, Sn, Pb, N, As and Sb, and the Aluminat-and Zinkat-Ionen unter Verwendung eines Valenzkraftfeldes with 5 Konstantens have been investigated.
Abstract: Mit Hilfe der gruppentheoretischen Methode vonWilson wurden die Konstanten der potentiellen Energie fur die Tetramethylverbindungen und-ionen der Elemente der 4. und 5. Gruppe, besonders des C, Si, Ge, Sn, Pb, N, As und Sb, sowie auch der Aluminat- und Zinkat-Ionen unter Verwendung eines Valenzkraftfeldes mit 5 Konstanten berechnet. Auf der Grundlage der vonCyvin postulierten Symmetriekoordinaten wurden die Grosen der mittleren Amplitudenquadrate und die mittleren Schwingungsamplituden fur gebundene und nicht-gebundene Atompaare bei den Temperaturen 298° K und 500° K berechnet. Der geringfugige Einflus der Schwingungen der Methyl- und Hydroxylgruppen auf die Gerustschwingungen wurde vernachlassigt, jedoch die nicht-diagonalen Elemente bei der Losung der Sakulargleichungen in Betracht gezogen.
TL;DR: The spin orientation of the ions in Co was calculated for the minimum-energy state in this paper, and the spin orientations correspond to the magnetic space group of Co. The results are in general agreement with the experiment of Miedema, Postma and Huiskamp.
Abstract: The spin orientation of the ${\mathrm{Co}}^{+2}$ ions in Co${(\mathrm{N}{\mathrm{H}}_{4})}_{2}$${(\mathrm{S}{\mathrm{O}}_{4})}_{2}$\ifmmode\cdot\else\textperiodcentered\fi{}6${\mathrm{H}}_{2}$O was calculated for the minimum-energy state. First an effective magnetic field arising from the dipolar interaction was computed, and this was employed in the spin Hamiltonian to determine the energy of the cobalt Zeeman and hyperfine interactions. The latter was comparable to the dipolar energy, which complicated the computation. It was found that the spin system becomes antiferromagnetic below the estimated N\'eel temperature of 0.10\ifmmode^\circ\else\textdegree\fi{}K. The spin orientations are given and shown to correspond to the magnetic space group $\frac{P{2}_{1}}{{a}^{1}}$. The results are in general agreement with the experiment of Miedema, Postma, and Huiskamp.
TL;DR: In this article, a study of the complexes formed between Cr(III) and iodate ion in solutions of ionic strength of 0·5, and [H+] = 0·10 M has been made.
TL;DR: In this paper, the proposed coupling constants for 1,2:3,4-dibenzanthracene are 1.50, 1.04, 0.73, 2.54 and 1.66 G.