Showing papers by "University of North Texas published in 1982"
TL;DR: In this paper, the relationship between structure, vibrational dispersion relations, and band structure for chalcopyrite and related compounds is discussed in a detailed and concentrated manner.
Abstract: Publisher Summary The chapter presents a study on the relationship between structure, vibrational dispersion relations, and band structure for chalcopyrite and related compounds. The essential step in this procedure is the “folding” of the dispersion relations [ ω (k) or E (k)] for the simplest structure into the smaller Brillouin zone of the more complicated one. In one-dimensional models, such folding is trivial enough and is discussed in relation to the nearly free electron approximation, Peierls instability, and so on. In three dimensions, it is more complex and therefore merits the detailed and concentrated description that is presented in this chapter. In addition to the chalcopyrites, the chapter includes certain quaternary and “defect” or “vacancy” compounds, such as HgIn 2 Te 4 . The vacancy compounds may be considered to have tetrahedral structures with a sublattice of unfilled sites. In this case, it is questionable whether the compound is to be regarded as derived from its parent structure by a small perturbation, as is often assumed for chalcopyrites. Compounds that have tetrahedrally coordinated structures generally have an average number of four valance electrons per atom. This is the Grimm–Sommerfeld rule.
95 citations
TL;DR: The authors examined the mechanics of hitting a baseball to the same and opposite fields and concluded that no significant interaction exists between hitting ability and hitting technique when hitting to defined field areas and that no interactions exist between the two groups.
Abstract: The purpose of this study was to examine the mechanics of hitting a baseball to the same and opposite fields. Twenty male subjects were assigned to one of two groups according to their baseball hitting abilities. Each subject performed as many trials as were necessary to successfully hit a pitched ball three times to both the same and opposite fields. Each trial was filmed from above. No significant interactions (p < 0.05) were found between subject groups and field hits with selected temporal and kinematic parameters entered as dependent variables. Significant differences (p < 0.05) were found between body landmark and segment component displacements and velocities at the instant prior to ball contact. The maximum resultant linear and angular speed of the examined body and bat landmarks were found to occur prior to ball contact. Based on the results of the study it was concluded that no interactions exist between hitting ability and hitting technique when hitting to defined field areas and that ...
77 citations
TL;DR: Analyses of pollen and land snails from rocksheter sites in the Osage Hills of northeastern Oklahoma indicate that the period 2000-1000 yr B.P. was moister than today as discussed by the authors.
49 citations
44 citations
TL;DR: The authors found that having prior exposure to baseline information was significantly better at detecting deception, though repeated exposure did not significantly increase accuracy, and a strong and significant positive correlation between these discrepancy estimates and attributions (accurate or not) of deceit.
Abstract: Two studies of the relations among observer familiarity, perceived behavioral discrepancy, and judgmental accuracy in detecting deception are reported. In Study I, observers receiving either no prior exposure to baseline information on a communicator, one prior exposure, or repeated exposure made judgments of truthfulness or deceit on the part of 16 different communicators. Results indicated that observers having prior exposure to baseline information were significantly better at detecting deception, though repeated exposure did not significantly increase accuracy. In Study II, truthful baseline and potentially deceptive samples of behavior were compared and discrepancies estimated by a group of observers. Results indicated a strong and significant positive correlation between these discrepancy estimates and attributions (accurate or not) of deceit.
43 citations
43 citations
TL;DR: In this article, the first Born calculations overpredict the data at all energies studied, and the perturbed-stationary-state calculations with energy loss, Coulomb deflection, and relativistic effects agree with the present data for both /sub 1/sup 1/H/sup +/ and /sub 2/sup 4/He/sup+/ ions at approx.
Abstract: M-shell x-ray-production cross sections are reported for /sub 1//sup 1/H/sup +/ protons and /sub 2//sup 4/He/sup +/ ions incident on thin targets of /sub 79/Au, /sub 82/Pb, /sub 83/Bi, and /sub 92/U. The energy of the ions ranged from 0.3 to 2.6 MeV in increments of 0.1 MeV. The first Born calculations overpredict the data at all energies studied. The perturbed-stationary-state calculations with energy loss, Coulomb deflection, and relativistic effects agree with the present data for both /sub 1//sup 1/H/sup +/ and /sub 2//sup 4/H/sup +/ ions at approx.0.35 MeV/u, overpredict the data at higher E/sub 1//A/sub 1/, and underpredict the data at lower E/sub 1//A/sub 1/. The electron-capture contribution to the target ionization is calculated to be less than 3.5% for the targets, projectiles, and energies reported in this work.
42 citations
TL;DR: It was concluded that reckless driving under the influence of alcohol, is at least partly a result of the pharmological effects of ethanol.
38 citations
TL;DR: Water solubility, hydrolysis and photolysis rate constants were determined for lindane in three different natural water-sediment systems, as well as in a Milli-Q water and montmorillonite clay system.
Abstract: Water solubility, hydrolysis and photolysis rate constants, and sorption-desorption partition coefficients were determined for lindane in three different natural water-sediment systems, as well as in a Milli-Q water and montmorillonite clay system. The aqueous solubility of lindane in surface waters at 25 ± 1°C ranged from 7.9 to 8.4 mg/L. In Milli-Q water, lindane solubility was 9.2 mg/L. At α = 0.05, no significant difference was found between the values in different natural waters; however, the Milli-Q water solubility did differ statistically. Lindane hydrolysis was found to be catalyzed by hydroxide and hydrogen ions. Neutral hydrolysis was relatively unimportant. Hydrolysis data followed first-order kinetics with kh values of 74 × 10−4 h−1 at pH 9 and 7.4 × 10−1 h−1 at pH 5. Experimental hydrolysis half-life (t1/2) in natural waters of pH 9.3 was comparable to the calculated value (92 h). Other natural water systems of pH 7.3 and 7.8 had t1/2 values greater than calculated values. Adjusted mid-winter photolysis half-life of lindane in Milli-Q water was 1.56 × 103 h. Photolysis rate enhancement was noted in natural water of pH 9.3, possibly due to the alkaline hydrolysis side reaction. Photolysis rate retardation was noted in natural water of pH 7.3 and 7.8. Sorption-desorption coefficient in Milli-Q water-montmorillonite clay was 1,259. Sorption coefficients for the natural systems ranged from 56 to 2,238. Results of the sorption-desorption experiments indicate that the wide diversity of the characteristics of the natural water sediment systems considerably affect the lindane sorption-desorption behavior.
37 citations
TL;DR: In this paper, the first direct observation of anisotropic state filling in semiconductors was made by the first author, who observed that self-diffraction is observed from transient orientational gratings produced in germanium by a filling of the optically coupled states by direct absorption of the nearly monochromatic polarized exciting radiation.
Abstract: Picosecond self-diffraction is observed from transient orientational gratings produced in germanium by an anisotropic (in $k$ space) filling of the optically coupled states by direct absorption of the nearly monochromatic polarized exciting radiation, the first direct observation of anisotropic state filling in semiconductors. A new theoretical model is presented briefly; agreement is found with all aspects of the experiment.
36 citations
TL;DR: The Worldmindedness Scale (Wscale) developed by Sampson and Smith was administered to 376 professional buyers by mail questionnaire to determine the incidence of worldmindedness among them and its...
Abstract: The Worldmindedness scale (W-scale) developed by Sampson and Smith was administered to 376 professional buyers by mail questionnaire to determine the incidence of worldmindedness among them and its...
TL;DR: “Reverse immunoadsorption” may be a generally useful method for protein purification and allowed the initiation of structural studies with the human enzyme.
TL;DR: In this paper, the fragmentation characteristics of the trimethyl-Group IV cations have been studied using mass analyzed ion kinetic energy (MIKE), V 1 2 / E (linked) metastable and consecutive reaction monitoring techniques.
TL;DR: In this paper, high-resolution spectra for free $A$ excitons in CdS were obtained by two-photon absorption using photoconductivity techniques. The magnetic field dependences are analyzed in terms of linear Zeeman splitting and diamagnetic interactions.
Abstract: High-resolution spectra are obtained for the free $A$ excitons in CdS by two-photon absorption using photoconductivity techniques. At zero applied magnetic field the anisotropy splitting of the $2P$ and $3P$ exciton states is observed and interpreted with an anisotropic effective-mass Hamiltonian. The energies of these states are measured as a function of magnetic field up to $B\ensuremath{\simeq}$10 T. The magnetic field dependences are analyzed in terms of linear Zeeman splitting and diamagnetic interactions. At low fields the diamagnetic contribution gives the usual quadratic field dependence but deviates significantly at higher fields. At a given field, the deviation is found to increase dramatically with increasing quantum number $n$. This deviation is fitted by variational calculations developed by Larsen, which take into account the interaction of states through the diamagnetic term in the Hamiltonian. The magnetic field dependence of these states allow us to determine the masses as ${m}_{e}^{\ensuremath{\perp}}=(0.210\ifmmode\pm\else\textpm\fi{}0.003){m}_{0}$ and ${m}_{h}^{\ensuremath{\perp}}=(0.64\ifmmode\pm\else\textpm\fi{}0.2){m}_{0}$. At $B=0$ the narrow laser linewidths (0.05 meV) allow an accurate determination of the $A$-exciton binding energy of 27.4\ifmmode\pm\else\textpm\fi{}0.8 meV and the anisotropy parameter of 0.797\ifmmode\pm\else\textpm\fi{}0.013 from which the energy gap ${E}_{g}^{A}=2582.5\ifmmode\pm\else\textpm\fi{}0.2$ meV at $T=1.8$ K is calculated. Finally, the temperature dependence of the $A$ gap is determined.
TL;DR: It is concluded that the two races are maintaining separate gene pools and that chromosomal race E be recognized as a separate species, Geomys breviceps.
Abstract: Electrophoretic variation in proteins encoded by 21 loci was analyzed for 37 populations of Geomys bursarius sampled across the ranges and at two contact zones of chromosomal races D (2N = 72, FN = 70) and E (2N = 74, FN = 72). Previous electrophoretic studies at a contact zone of these races in central Texas indicated a high degree of genic differentiation between the two forms. Four loci, ADH-1, MDH-2, LDH-1, and IDH-1, exhibited patterns of alternately fixed or predominant alleles between the races. This pattern was consistent across the ranges of both races and at a contact zone near Norman, Oklahoma. Genic identities among populations of chromosomal races D and E were 0.938 and 0.953, respectively, while interracial genic identity was 0.685. Additionally, the races have significantly different levels of heterozygosity, along with differences in interpopulation heterogeneity. Intensive study of the contact zone near Norman, Oklahoma, revealed the chromosomal races are generally parapatric, except in one area where a local population was comprised of both races and a F1 hybrid. No backcross individuals were found. It is concluded that the two races are maintaining separate gene pools and that chromosomal race E be recognized as a separate species, Geomys breviceps .
TL;DR: Non-mitogen-stimulated lymphocytes exposed to very low concentrations of carcinogen in the presence of low density lipoproteins demonstrated [3H]thymidine incorporation; without the concomitant addition of lowdensity lipoprotein the low concentrations
Abstract: Human serum lipoproteins were isolated by means of size exclusion h.p.l.c. Non-covalent uptake of [3H]benzo[a]pyrene was quantitated for fractions collected from the effluent of a liquid chromatographic separation of human serum, and was found to directly correlate with the lipoprotein concentration. An electrophilic benzo[a]pyrene metabolite, [3H]trans 7,8-dihydrodiol-9,10-epoxybenzo[a]pyrene, non-covalently associated with low density lipoproteins was transferred to human lymphocytes in vitro and bound acid-precipitable nucleic acids of the lymphocytes as a function of time. Benzo[a]pyrene metabolite binding to lymphocyte DNA was demonstrated by means of CsCl density gradient analysis. Non-mitogen-stimulated lymphocytes exposed to very low concentrations of carcinogen in the presence of low density lipoprotein demonstrated [3H]thymidine incorporation; without the concomitant addition of low density lipoprotein the low concentrations of carcinogen did not stimulate [3H]thymidine incorporation.
TL;DR: A 25-yr.-old white, married female was treated for chronic pruritic eczema through the use of frontalis EMG, relaxation, and imagery training, and the rash disappeared completely.
Abstract: A 25-yr.-old white, married female was treated for chronic pruritic eczema through the use of frontalis EMG, relaxation, and imagery training. The biofeedback readings, ratings of the pruritus (0 to 5) and ratings of skin smoothness (0 to 5) were made over 10 sessions. Although the EMG measures did not decrease significantly, the rash disappeared completely. A 1-yr. follow-up confirmed disease control.
TL;DR: In this article, the contributions of two types of short-term memory (STM)-passive span of apprehension and working memory-to the intellectual functioning of adults and age differences therein were assessed.
Abstract: To assess the contributions of two types of short-term memory (STM)-passive span of apprehension and working memory-to the intellectual, (that is, fluid [Gf] and crystallized [Gc]) functioning of adults and age differences therein, data from a test battery assessing STM, Gf, and Gc administered to three (n = 54) groups of adults, aged 17-26, 39-51, and 59-76 years (N = 162), were analyzed. Measures of STM and Gf showed substantial and significant negative relationships with age, while the Gc-age relations were significantly positive, but weak. Age declines in Gf functioning appear related to working STM (as measured by backward digits) deficits but not to passive STM (as measured by forward digits) deficits. In contrast to previous literature suggesting that memory span tasks have little utility as measures of STM deficits among the aged, these results suggest great utility if the forward versus backward memory span distinction is maintained.
TL;DR: An overall model is presented for the role of glucose dehydrogenase, seen as a multifunctional protein involved in several catabolic sugar pathways in the endoplasmic reticulum, based upon kinetic evidence.
TL;DR: In this article, the authors report the findings of a study investigating the clothing preferences and problems of older women, which consisted of thirty women age 65 years and over who were members of two clubs in Tallahassee.
Abstract: This paper reports the findings of a study investigating the clothing preferences and problems of older women. The sample consisted of thirty women age 65 years and over who were members of two clubs in Tallahassee, Florida. Personal interviews were conducted by the researcher in the home of each respondent. Style features discovered to be preferred were A‐line skirts; princess, A‐line, and shift dresses; V‐necklines; convertible collars; long with cuff, three‐quarter length, and short sleeve styles. Color preferences revealed blue as the most popular color for clothing. Implications of the research for gerontologists in higher education and for the American clothing industry are cited and discussed.
TL;DR: In this article, the polarized and depolarized Raman spectra of methanol in the CH 3 stretching region (2800-3000 cm −1 ) were measured in the neat liquid as a function of concentration and at various concentrations in the solvents water, dimethyl sulfoxide and carbon tetrachloride.
TL;DR: It is proposed that there is no chloride amelioration of nitrite toxicity at low pH, significant toxicity reduction at high pH and increased nitriteoxicity in all groups atLow pH relative to neutral pH.
Abstract: Experiments were conducted to evaluate the combined effects of hydrogen ion and chloride concentrations on nitrite toxicity in bluegill (Lepomis macrochirus). Our working hypotheses proposed (1) no chloride amelioration of nitrite toxicity at low pH, (2) significant toxicity reduction at high pH and (3) increased nitrite toxicity in all groups at low pH relative to neutral pH.
TL;DR: Linewidth parameters for several components in the rotational spectrum of the NO 2 molecule were determined in this article, and the calculated values take into account the contributions due to dipole-dipole, dipolequadrupole, quadrupole-Dipole interactions in the expansion of intermolecular potential energy.
TL;DR: The laser-induced surface breakdown irradiance measured for CdTe over this pulse width range scaled as t(p)(-1/2)[t(p) is the laser pulse width (FWHM)] indicates that laser- induced damage in this material is due to linear absorption by a thin surface contamination layer.
Abstract: Results of laser-induced damage measurements in CdTe and other selected II–VI materials are reported. These studies were conducted using pulsed 1.06-μm radiation from a Nd:YAG laser. The laser pulse width was varied from ~40 to 9000 psec (9 nsec). The laser-induced surface breakdown irradiance measured for CdTe over this pulse width range scaled as
tp-1/2 [tp is the laser pulse width (FWHM)]. This indicates that laser-induced damage in this material is due to linear absorption by a thin surface contamination layer.
TL;DR: In this article, the reaction of t-butyllithium with phenylmethylvinylchlorosilane at low temperature in hexane solvent gave a 48% yield of a mixture of the five isomers of the 1,3-diphenyl-1,3dimethyl-2,4-dineopentyl -1, 3-disilacyclobutanes, along with an acyclic isomer.
TL;DR: The previously unreported drumming signals of six species of Perlidae are described, and comparisons of drumming among 12 North American species are made.
Abstract: The previously unreported drumming signals of six species of Perlidae are described, and comparisons of drumming among 12 North American species are made. Claassenia, Hesperoperla, and Paragnetina display two- or three-way signals; the male call is monophasic, and male-female signals consist of 5 to 25 beats (except Paragnetina kansensis females) at moderate to slow intervals of 25 to 120 msec. Almost no overlap of major signal parameters occurs among these genera. Acroneuria species have unique, complex signals; the male call is diphasic, with 31 to 44 and 3 to 9 beats in the first and second phases, respectively. The male call of Calineuria californica has a single, prolonged beat, produced by dragging the hammer on the substrate; this clearly separates it from known Acroneuria signals. P. kansensis females have a very long signal of 495 to 605 beats, spaced at nonvariable intervals of 88 ± 0 msec.
TL;DR: This article found that participants' responses to taboo words were significantly greater than their responses to neutral words, p <.05, while the conventional level participants demonstrated significantly greater GSRs to socially taboo words than did the more morally autonomous post-conventional participants.
Abstract: The present study sought to determine whether or not a personality variable, the level of moral development, was related to the way in which individuals respond to socially taboo words. As a result of their responses to a moral judgment questionnaire based on Kohlberg’s theory of moral development, 28 participants were assigned to one of two groups: (a) the conventional level group (Stages 3 and 4), a level that is desirous of maintaining social mores for their own sake, and (b) the postconventional level group (Stage 6), a mentality that emphasizes one’s own autonomy with regard to the adherence to social rules. Participants’ galvanic skin responses were assessed while they viewed 18 socially taboo and neutral words presented sequentially via a memory drum. As expected, participants’ GSRs to taboo words were significantly greater than their responses to neutral words, p <.05. Additionally, as hypothesized, the conventional level participants demonstrated significantly greater GSRs to socially taboo words than did the more morally autonomous postconventional participants. These findings support Kohlberg’s theory. Some practical applications of the present study are also discussed.