Showing papers by "Brigham Young University published in 1970"
TL;DR: A generalization of Takayanagi's fully quantum mechanical strong coupling approximation for rotationally inelastic collisions, valid for small energy exchange, is discussed and tested numerically on a model problem as discussed by the authors.
107 citations
TL;DR: Diamond powder is rapidly sintered into molded shapes at a pressure of about 65 kilobars and a temperature of 2500� Kelvin and compares favorably with natural carbonado in its properties.
Abstract: Diamond powder is rapidly sintered into molded shapes at a pressure of about 65 kilobars and a temperature of 2500 degrees Kelvin. Other conditions of pressure and temperature are also suitable. The product compares favorably with natural carbonado in its properties.
82 citations
TL;DR: In this article, the nature and petrologic significance of ultramafic inclusions, together with megacrysts of kaersutite and black clinopyroxene, are discussed.
Abstract: Essentially two types of ultramafic inclusions occur in the basanitic lavas and ejecta deposits of the northwestern Grand Canyon, Arizona. Abundant, olivine-rich nodules contain an emerald green, chrome-rich diopside and chrome-rich spinels. A much less common group of inclusions generally containing poikilitic kaersutite have more variable modal compositions, more variable but iron-rich and chrome-poor mineral compositions, and are characterized by the presence of a titaniferous clinopyroxene which appears black in hand specimen. The nature and petrologic significance of these black clinopyroxene-bearing inclusions, together with megacrysts of kaersutite and black clinopyroxene, are discussed in this paper. Petrographic aspects indicate an origin as cumulates of fractionating basaltic magma. Compositions of pyroxenes suggest high pressures of crystallization. The co-precipitation of orthopyroxene, clinopyroxene, olivine and Mg-spinel from what in all probability was under-saturated magma, together with the total absence of feldspar as a cumulate or intercumulate phase, is compatible with crystallization near 10 kb, on the basis of quite limited experimental data on anhydrous basaltic compositions. Pressures of this sort are attained at depths close to the mantle-crust boundary in the western Grand Canyon. By way of comparison, cumulate-textured inclusions from central Nevada containing rare orthopyroxene, widespread plagioclase, and more Fe-enriched clinopyroxenes, kaersutites, olivines and spinels are postulated to have crystallized at lower temperatures (or at a more advanced stage of fractionation) and possibly at lower pressures. Numerous occurrences, worldwide, of kaersutite-bearing inclusions, always in undersaturated host rocks, have recently been reported. Compositionally, the kaersutites are quite uniform, whether coexistent with pyropic garnet-clinopyroxene (Kakanui, New Zealand), with ortho-pyroxene-clinopyroxene-olivine-Mg spinel (Grand Canyon), or with plagioclase-clinopyroxene-olivine-magnetite. The last assemblage is found in shallow-seated igneous bodies of alkalic, mafic composition, as well as in inclusions within basaltic rocks. These occurrences imply the precipitation of kaersutite amphibole over a broad range of pressures, and as high as those prevailing in the upper mantle.
69 citations
TL;DR: In this article, X-ray diffraction (MoK α ) was used to obtain compression data on stishovite and coesite subjected to pressures up to 85 kb at 25°C in a tetrahedral press.
59 citations
TL;DR: Fossils of Lower Triassic vertebrates excavated from coarse quartzose sandstones forming stream channel deposits of the Fremouw Formation at Coalsack Bluff, in the Transantarctic Mountains of Antarctica are the first assemblage of fossil tetrapods of significant geologic age to be found on the Antarctic Continent.
Abstract: During the austral summer of 1969-1970 bones of Lower Triassic vertebrates were excavated from coarse quartzose sandstones forming stream channel deposits of the Fremouw Formation at Coalsack Bluff, in the Transantarctic Mountains of Antarctica. This is the first assemblage of fossil tetrapods of significant geologic age to be found on the Antarctic Continent. The fossils include labyrinthodont amphibians, presumed thecodont reptiles, and therapsid reptiles, including the definitive genus, Lystrosaurus. This genus is typical of the Lower Triassic of southern Africa, and is also found in India and China. Lystrosaurus and associated vertebrates found in Antarctica were land-living animals: therefore their presence on the South Polar Continent would seem to indicate the contiguity of Antarctica, Africa, and India in Early Triassic times.
57 citations
TL;DR: The ultrastructure of dormant and germinated basidiospores of a species of Psilocybe was studied using standard thin sectioning and freeze-etching techniques.
Abstract: The ultrastructure of dormant and germinated basidiospores of a species of Psilocybe was studied using standard thin sectioning and freeze-etching techniques. The results obtained with freeze-etchi...
38 citations
25 citations
TL;DR: Petrified palm stems from the Middle Jurassic Arapien Shale Formation near Redmond, Sevier Country, Utah, are the first unequivocal angiosperms reported from pre-Cretaceous strata.
Abstract: Petrified palm stems (Palmoxylon simperi and Palmoxylon pristina) from the Middle Jurassic Arapien Shale Formation near Redmond, Sevier Country, Utah, are the first unequivocal angiosperms reported from pre-Cretaceous strata.
25 citations
TL;DR: In this paper, a first-order iteration of Takayanagi's strong coupling approximation for rotationally inelastic collisions is discussed and applied to a model problem, similar to that used in the distorted wave approximation.
25 citations
TL;DR: In this paper, an improvement in a previous procedure for the analytic asymptotic evaluation of integrals arising in the quantum-mechanical theory of inelastic molecular collisions is presented.
Abstract: An improvement in a previous procedure for the analytic asymptotic evaluation of integrals arising in the quantum‐mechanical theory of inelastic molecular collisions is presented. The integrals are evaluated using Langer's uniform asymptotic wavefunctions and the higher‐order saddle‐point or steepest‐descents method. It is found that the Langer functions give no better results than WKB functions, but the higher‐order steepest‐descents corrections produce a marked improvement. The result is a simple method for evaluating a large class of integrals with an error of 0.1%–2.1%.
24 citations
TL;DR: A simple formula involving the oscillator strength sum S(− 3 2 ) gave an upper bound for the Van der Waals constant Cab as mentioned in this paper, within an error of 0.3% to 12.1%.
TL;DR: The cytoplasmic membrane is the site of β-lysin action and protoplasts lysed rapidly in its presence, whereas cell walls and wall autolysis were unaffected.
Abstract: The cytoplasmic membrane is the site of β-lysin action. Protoplasts lysed rapidly in its presence, whereas cell walls and wall autolysis were unaffected.
TL;DR: A soluble Cytochrome has been partially purified from pig kidney and the absorption spectra of this cytochrome in both the oxidized and reduced state resembles microsomal cy tochrome b5.
TL;DR: Two new species of Ameroseiidae mites found in the nasal cavities of birds of New Guinea are described— Ameroseius senarius and A. wilsoni.
Abstract: Two new species of Ameroseiidae mites found in the nasal cavities of birds of New Guinea are described— Ameroseius senarius and A. wilsoni .
TL;DR: Although no significant differences were found, the direction of difference was significantly consistent and following a video playback Ss tended to perceive themselves more favorably.
Abstract: The purpose of this experiment was to determine the effects of a video playback of a person on his self-concept. Ss in teams of 3 were randomly assigned to a video playback condition (VP) or a no video playback condition (NVP). Each team had both VP and NVP Ss. All Ss taught a 7-min. lesson which was video recorded. The VP Ss saw a video playback of their presentation, and both VP and NVP Ss completed measures of Body-cathexis, Self-cathexis, Self-concept, Public-self, Teacher-self, Self-acceptance, Self-criticality, Dominance and Self-assurance, and Flexibility. It was hypothesized that there would be a significant difference between the VP and NVP Ss on each of the self-concept variables measured. Although no significant differences were found, the direction of difference was significantly consistent. Following a video playback Ss tended to perceive themselves more favorably.
TL;DR: This study investigated the relation of candidate preference during the 1968 presidential election to scores on 4 measures of authoritarianism, and significant differences between Wallace supporters and supporters of other candidates on 3 of the 4 measures indicate that general authoritarianism in addition to right-wing authoritarianism is predictive of candidate preferences.
Abstract: The literature on the relationship of authoritarianism and political behavior is complex. This study investigated the relation of candidate preference during the 1968 presidential election to score...
TL;DR: Calf starter rations containing 7.9% and 8.8% digestible protein were fed to 12 Holstein heifer calves per treatment from an average initial weight of 59kg to a constant terminal weight of 100kg, increasing protein levels significantly.
TL;DR: In this paper, underachieving male high school students were involved in a 3-week survival training experience designed to raise self-esteem, evaluation of parents, and evaluation of friends.
Abstract: Underachieving male high school students were involved in a 3-wk. survival training experience designed to raise (a) self-esteem, (b) evaluation of parents, and (c) evaluation of friends. A semantic differential administered in a pre- and posttest design indicated a significant increase in self-esteem and evaluation of parents.
TL;DR: Activation of sporozoites in oocysts of Eimeria acervulina, E. intricata, and E. scabra occurred after pretreatment in aqueous 0.02 M cysteine hydrochloride under an atmosphere of CO2, followed by incubation in a trypsin-bile mixture.
Abstract: SYNOPSIS Activation of sporozoites in oocysts of Eimeria acervulina (chicken), E. intricata (sheep), and E. scabra (swine) occurred after pretreatment in aqueous 0.02 M cysteine hydrochloride under an atmosphere of CO2, followed by incubation in a trypsin-bile mixture. Sporozoites of E. stiedae (rabbit), E. bilamellata (squirrel), and Isospora canis (dog) became activated when incubated in trypsin and bile with or without prior CO2-pretreatment of oocysts; however, when CO2-pretreatment was used, activation of these species in trypsin and bile was greatly enhanced. For E. acervulina, 12% of the oocysts were activated after 4 hr CO2-pretreatment and 10 hr incubation in trypsin and bile at 43 C; higher temperatures or longer pretreatment times did not cause greater activation. Eimeria intricata oocysts became activated after 1 hr pretreatment and 10 hr incubation in trypsin and bile at 37, 39 or 41 C, respectively. The highest activation (31%) occurred after 20 hr pretreatment and 10 hr incubation in trypsin and bile at 41 C. Ninety percent of E. scabra oocysts contained active sporozoites after 1 hr CO2-pretreatment and 10 hr incubation in trypsin and bile at 37 C. At 39 or 41 C, 100% activation occurred with this species after similar pretreatment and treatment periods. With E. bilamellata, 64% activation occurred in nonpretreated oocysts incubated 10 hr in trypsin and bile at 41 C, whereas 100% activation occurred if oocysts were pretreated with CO2 for 1 hr before treatment with trypsin and bile. Thirty-one, 35, and 36% of CO2-pretreated E. stiedae oocysts were activated after 1 hr incubation in trypsin and bile at 37, 39 or 41 C, respectively, whereas 1, 2, and 20% activation occurred in nonpretreated oocysts incubated at the same temperatures. Sporozoites in 99-100% of I. canis oocysts were activated after 10 hr treatment in trypsin and bile with or without 1 hr CO2-pretreatment at 23, 37, 39 or 41 C.
TL;DR: Palm roots discovered in place in the Jurassic Arapien Shale Formation are further evidence for pre-Cretaceous flowering plants.
Abstract: Palm roots discovered in place in the Jurassic Arapien Shale Formation are further evidence for pre-Cretaceous flowering plants.
TL;DR: In this paper, the authors examined the ability of the blind to distinguish among speech phonemes and found no significant difference in auditory discrimination abilities of visually limited and sighted children when the task involved differentiation among environmental sounds.
Abstract: Since audition is the most important input modality for the visually handicapped.\" detailed study in the area is warranted. Most investigations pertaining to the auditory skills of visually limited persons have been concerned with the relationship of audition to mobility3,5.8,21 and to listening comprehension/·12.22. or with the question of sensory compensation.13.14.26 Auditory perception, however, has remained relatively unexplored. An exception is Axelrod's study.' which included auditory perceptual tasks in an investigation of the effects of blindness on the remaining sense modalities. Axelrod found no significant difference in auditory discrimination abilities of visually limited and sighted children' when the task involved differentiation among environmental sounds. D Acknowledging the recognized importance of audition to language acquisition, the ability of the blind to distinguish among speech phonemes should be investigated. The purpose of this study, therefore, was to examine selected characteristics of this skill in visually limited and sighted children. The following null hypotheses were formulated:
TL;DR: Initial results from back-home application within the organization indicate that these design features have reduced the entry and transfer problems experienced in utilizing laboratory earnings in organization development.
Abstract: Behavioral change agents engaged in management and organization development efforts recognize as crucial, solutions to the recurring problems of entry and transfer. The major feature of the project reported here and still under way is the attempt to optimize both entry methods and transfer activities by a single developmental approach which includes the unique feature of using laboratory training to build a consulting relationship between internal consultants and their operating managers in an industrial organization.The essential elements of the total design included: (a) laboratory training as an initiating vehicle, (b) the use of internal Trainer-Consultants, (c) the use of data collection and feedback, and (d) a single management and organizational conceptual framework. A single framework was used to overlay prelaboratory, laboratory, and postlaboratory activity. Data about each of the 25 participating managers were collected from peers and subordinates prior to the laboratory. The laboratory allowed ...
TL;DR: The Slosson Intelligence Test (SIT) was given to 122 male and female profoundly and severely mentally retarded residents of an institution who had previously been given a Stanford-Binet, Kuhlmann Extension of the Binet Test or Kuhlmann Test of Mental Development.
Abstract: The Slosson Intelligence Test (SIT) was given to 122 male and female profoundly and severely mentally retarded residents of an institution who had previously been given a Stanford-Binet, Kuhlmann Extension of the Binet Test or Kuhlmann Test of Mental Development. A correlation of .91 was found between scores on the SIT and the Kuhlmann, indicating the SIT as a useful test to use with severely retarded persons.
TL;DR: The Generalized Jordan Canonical Form (GJF) as mentioned in this paper is a generalization of the generalized Jordan canonical form (GCF) of the GJF, which is used in this paper.
Abstract: (1970). The Generalized Jordan Canonical Form. The American Mathematical Monthly: Vol. 77, No. 4, pp. 392-395.
TL;DR: In this paper, the measured effect of radiant energy flux on the atmospheric pressure burning rate of a solid propellant was investigated and it was concluded that the effect is negligible except when the propellant burning rate was very low as, for example, during the quench of a controllable motor.
Abstract: This paper describes the measured effect of radiant energy flux on the atmospheric pressure burning rate of a solid propellant. It was concluded that the effect is negligible except when the propellant burning rate is very low as, for example, during the quench of a controllable motor. Also, from the experimental data, it was calculated that the PBAN-AP propellant had an apparent surface temperature of 560 °C and an apparent exothermic solid decomposition that liberated 130 cal/g.
TL;DR: In this paper, the authors studied the optimal hydrogenation catalysis parameters of rhenium oxides and found that they can achieve the maximum yields of product consistent with the more critical parameters.
Abstract: Research efforts of the past 20 years have amply demonstrated the catalytic properties of rhenium metal and many of its compounds in heterogeneous hydrogenation reactions.1 In many of these, rhenium is uniquely effective. Among these instances may be cited the remarkable ease (superior to that of any other catalysts reported) with which rhenium oxides catalyze the hydrogenation of carboxylic acids, in general, to alcohols; the tendency to selectively hydrogenate the carbon-oxygen multiple bond rather than the carbon-carbon double bond in a,@-unsaturated carbonyl compounds, which is opposite to the usual hydrogenation catalyst selectivity; and the indication that maleic acid can be hydrogenated to tetrahydrofuran (THF), all first reported in 1959.2 In no instance, however, has a detailed, systematic effort been reported to optimize the important hydrogenation catalysis parameters: time, temperature, pressure, catalyst type, catalyst-substrate ratio, catalyst reuse, agitation, etc. In view of the considerable practical and potential economic importance of these reactions it was determined to make such a study of three systems: the hydrogenation of acetic acid to ethanol as a prototype of the rather general reduction of carboxylic acids to alcohol; the hydrogenation of crotonaldehyde (2-butenal) to crotyl alcohol (2-buten-1-01) ; and the hydrogenation of maleic anhydride to tetrahydrofuran. A schematic showing these conversions with intermediates/ by-products is given in FIGURE 1. This paper reports the results of this study so far. Some of the reaction parameters mentioned may be quite critical in a given instance, whereas others may be arbitrarily varied over a considerable range while still achieving optimum results provided only that compensating adjustments be made in one or more other related reaction parameters. The word “optimal” is used in this paper to describe those sets of reaction parameters which are conveniently attainable in the authors’ opinion and which give maximum yields of product consistent with the more critical parameters.