scispace - formally typeset
Search or ask a question

Showing papers by "University of North Texas published in 1968"


Journal ArticleDOI
TL;DR: The numerous small angle scatterings of the photon in the direction of the incident beam are followed accurately and produce a greater penetration into the cloud than is obtained with a more isotropic and less realistic phase function.
Abstract: Visible light scattering by clouds calculated by photon multiple scattered path following Monte Carlo code, using Mie theory

175 citations


Journal ArticleDOI
TL;DR: Three test forms, each measuring a different aspect of motor creativity, emerged from the analysis, and methods of scoring, such as summing the number of responses (fluency), computing frequency of occurrence ( originality), and combining the fluency and originality scores were investigated.
Abstract: Four test items were devised for each of four motivators: rubber balls, parallel-lines, a red hoop, and a low balance beam. These motivators were designed to serve as stimuli for tests capable of differentiating individual ability to produce both number and uniqueness of motor responses in problem solving tasks of a motor nature. Eight of the test items were administered one day and the remaining eight the following day. Equivalent form reliabilities for items ranged from .59 to .92. Internal coefficient reliabilities were .87 for day I and .92 for day II; however, because of factors such as intrasubject variance only day I data were subjected to a multiple regression analysis to determine the final test battery. Methods of scoring, such as summing the number of responses (fluency), computing frequency of occurrence (originality), and combining the fluency and originality scores were investigated. Three test forms, each measuring a different aspect of motor creativity, emerged from the analysis. ...

53 citations


Journal ArticleDOI
TL;DR: The reflected and transmitted radiances for the isotropic and Rayleigh models tend to be similar, as are those for the various haze and cloud models, and the downward flux, cloud albedo, and ean optical path are discussed.
Abstract: Particle size distribution influence on reflected and transmitted light from clouds calculated by Monte Carlo technique

40 citations


Journal ArticleDOI
TL;DR: The reflected and transmitted radiance of the earth's atmosphere is calculated by Monte Carlo techniques and the exact scattering function for the aerosols is used as calculated from the Mie theory.
Abstract: Monte Carlo method to calculate reflected and transmitted radiance of earth atmosphere using exact scattering function for aerosols by Mie theory

29 citations


Journal ArticleDOI
TL;DR: A Monte Carlo method that accurately allows for the numerous small angle scattering events is used to calculate the reflected and transmitted radiance and flux of visible radiation that has interacted with cumulus clouds.
Abstract: A Monte Carlo method that accurately allows for the numerous small angle scattering events is used to calculate the reflected and transmitted radiance and flux of visible radiation that has interacted with cumulus clouds. The variation of these quantities with solar zenith angle, optical thickness of the cloud, and surface albedo is studied. When the surface albedo is zero, the reflected radiance has a relative maximum at the horizon (except for very thick clouds and incident beam near zenith). When the incident beam is near the horizon, there is a strong maximum in the reflected radiance on the solar horizon and a pronounced minimum near the zenith. There is a relative maximum in the transmitted radiance around the direction of the incident beam until the cloud becomes thick in that direction. In most instances, the variations are greatly decreased when the surface albedo is unity.

18 citations




Journal ArticleDOI
TL;DR: The isothermal magnetoresistivity and Hall resistivity in a monocrystal of arsenic have been studied at temperatures of liquid helium in fields up to 25 kG.
Abstract: The isothermal magnetoresistivity and Hall resistivity in a monocrystal of arsenic have been studied at temperatures of liquid helium in fields up to 25 kG. All measurements were taken in the basal plane of the crystal with magnetic field perpendicular to the plane and parallel to the trigonal axis. The binary axis was in the basal plane and parallel to the long dimension of the crystal. The magnetoconductivity tensor element ${\ensuremath{\sigma}}_{11}$ and the Hall conductivity element ${\ensuremath{\sigma}}_{12}$ were constructed from resistivity data and analyzed in terms of two-and three-band models. A least-squares curve fitting of the conductivities to the quasiclassical model of Sondheimer and Wilson indicates two major energy bands of carriers. The Hall effect is positive. The high-mobility carriers are holes with mobility approximately four times that of the equally populous electrons. The carrier concentration is $n\ensuremath{\simeq}\frac{2\ifmmode\times\else\texttimes\fi{}{10}^{20}}{{\mathrm{cm}}^{3}}$ if determined from ${\ensuremath{\sigma}}_{11}$ data along with effective-mass anisotropy data established from quantum-oscillation studies. Simultaneous curve fitting of the ${\ensuremath{\sigma}}_{11}$ and ${\ensuremath{\sigma}}_{12}$ data gives $n\ensuremath{\simeq}\frac{0.7\ifmmode\times\else\texttimes\fi{}{10}^{20}}{{\mathrm{cm}}^{3}}$.

8 citations



Journal ArticleDOI
TL;DR: In this paper, the authors compared leaders of campus social-political action groups with leaders of four other categories of student leaders on the basis of perceptions of the prevailing campus environmental press as measured by the College and University Environment Scales.
Abstract: Leaders of campus social-political action groups were compared with the leaders of four other categories of student leaders on the basis of perceptions of the prevailing campus environmental press as measured by the College and University Environment Scales. Significant differences among the five categories of group leaders were observed on four scales of the inventory. Three of the scales, Community, Awareness, and Scholarship, appeared to differentiate social-political activists from leaders of other types of campus groups. Significant differences between liberal and conservative leaders of social-political action groups were also observed on three scales of the CUES and between male and female leaders across all group categories on four scales.

5 citations



Journal ArticleDOI
TL;DR: In this paper, the magnetophonon oscillations in the longitudinal thermoelectric power of n-type InAs have been measured and shown to have a maximum near 43 kG and indicated the presence of additional maxima.


Journal ArticleDOI
TL;DR: A micropotometric technique was used to determine the effects of X-irradiation on the rates of water, calcium and potassium efflux from excised onion roots (Allium cepa) as discussed by the authors.

Journal ArticleDOI
TL;DR: The interpretation of General John J. Pershing's letter seemed to recommend that no armistice be granted as discussed by the authors, which was contrary to the advice that he had already given, arguing that the Allies should refuse to grant Germany any terms and that instead they should press their attack without quarter.
Abstract: O N October 30, 1918, General John J. Pershing, the commander-inchief of the American Expeditionary Forces, gave a letter to the Allied Supreme War Council, which was meeting to decide the terms of armistice with Germany. Pershing's letter seemed to recommend that no armistice be granted. Contradicting the advice that he had already given, his letter argued that the Allies should refuse to grant Germany any terms and that instead they should press their attack without quarter. Ever since 1918, scholars have accepted this interpretation of Pershing's letter.' They have overlooked that Pershing had ample reason to believe that President Woodrow Wilson wanted armistice terms so moderate that they would sacrifice the Allied victory. By opposing an armistice and demanding unconditional surrender, Pershing hoped to force Wilson and the Allies to settle for nothing less than the harsh armistice terms which he thought were necessary to guarantee victory. On October 3, 1918, the Germans had asked Wilson to arrange an armistice; but Pershing paid no particular attention to the talk of an armistice until the middle of the month.2 On several occasions after mid-October, he discussed the situation with the Allied generals; and then, on October 25, he went to Senlis to a formal meeting of the Allied army chiefs for a discussion of possible armistice terms. At the Senlis conference, Pershing presented no objections to granting an armistice. He prefaced his remarks



Journal ArticleDOI
TL;DR: Six dichlorophenoxyacetones were synthesized and examined as potential metabolic antagonists utilizing Avena coleoptile sections and the straight growth assay procedure, with the most inhibitory derivatives producing half-maximal growth responses (relative to the unaug-mented control growth) at concentrations of 106, 86, 80, and 62 mug/ml.
Abstract: Six dichlorophenoxyacetones were synthesized and examined as potential metabolic antagonists utilizing Avena coleoptile sections and the straight growth assay procedure. Supplements of indoleacetic acid promoted growth of the sections which were inhibited by the analogs; the most inhibitory derivatives were 2,3-; 2,4-; 2,5-; and 3,4-dichlorophenoxyacetone which produced half-maximal growth responses (relative to the unaug-mented control growth) at concentrations of 106, 86, 80, and 62 mug/ml, respectively. A Lineweaver-Burk plot of the data for the inhibition by 2,4-dichlorophenoxyacetone and its reversal by indoleacetic acid appeared to represent an uncompetitive-like inhibition.