Showing papers by "Wichita State University published in 1969"
TL;DR: Vortex breakdown on slender sharp edged and modified delta wings with varying sweep angles investigated in wind tunnel using schlieren system for flow visualization as discussed by the authors, using Schlieren-based flow visualization.
Abstract: Vortex breakdown on slender sharp edged and modified delta wings with varying sweep angles investigated in wind tunnel using schlieren system for flow visualization
282 citations
TL;DR: In this article, the elastic buckling loads of shear diaphragms are derived from an analysis of light-gage, corrugated-metal diaphrasms of the type that occur in pre-engineered metal buildings.
Abstract: Formulas for the elastic buckling loads of shear diaphragms are derived. They are obtained from an analysis of light-gage, corrugated-metal diaphragms of the type that occur in pre-engineered metal buildings. The formulas are applicable to any rectangular, orthotropic plate loaded in pure shear, and they are derived using orthotropic plate theory and the Ritz energy method. Small deflection theory is used first to establish critical loads and buckling modes. Then, large deflection theory is used to predict post-buckling load versus lateral deflection relationships. The results of experiments that were designed to verify the accuracy of the formulas are presented in the form of load versus lateral deflection curves covering the pre and post-buckling ranges. Several light-gage, corrugated-metal diaphragms of different size and corrugation shape were tested to determine their buckling behavior. The results of the experiments compare favorably with the formulas derived.
148 citations
TL;DR: In this article, it is shown that the use of a propeller at the wingtip, turning in the direction opposite to that of the wing vortex, shifts the trailing vortex core outboard, decreases the wing drag coefficient, increases the maximum lift coefficient and increases the effective aspect ratio.
Abstract: It is proposed that aircraft can be designed using propellers at the wingtips in such a way that the L/D ratio can be varied by changing the effective aspect ratio in flight. An experimental program testing a wing with propellers mounted at the wingtips is reported. It is shown that the use of a propeller at the wingtip, turning in the direction opposite to that of the wing vortex, shifts the trailing vortex core outboard, decreases the wing drag coefficient, increases the maximum lift coefficient and increases the effective aspect ratio. Rotating the propeller in the opposite direction has the reverse effect. A functional relationship is shown to exist between ACD/CD and Tcd/CLS-
56 citations
TL;DR: Centrally clamped spinning circular disk free transverse vibration analysis within accuracy of numerical computations as discussed by the authors was used to analyze the transverse vibrations of the transversal vibration.
Abstract: Centrally clamped spinning circular disk free transverse vibration analysis within accuracy of numerical computations
55 citations
TL;DR: It is concluded that recovery from irradiation and the instigation of cytokinesis by non-budding cells of C. albicans result from different metabolic processes which may be related through a common temperature sensitive step and not indicate the existence of a system for dark repair of DNA damage comparable to that occurring in bacteria.
Abstract: Inactivation of Candida albicans by ultraviolet (uv) light is markedly dependent upon (a) the cell division stage and (b) the nutrition and growth temperatures of cells both before and after irradiation. Cells grown at 37°C after irradiation show lower survivals than those grown at 25°C. At either recovery temperature, cells which had been cultured before irradiation at 37°C are able to sustain less uv damage prior to inactivation than those cultured at 25°C. The radiosensitivities of budding and non-budding cells are the same when survivals are scored at 25°C; at low uv dosages, cells show slightly poorer recoveries on enriched medium than on minimal medium whereas at higher dosages, their recoveries on both kinds of media are equivalent. In contrast, at 37°C, uv treated non-budding cells are much more susceptible to inactivation than budding cells; non-budding cells also express much poorer recovery on enriched medium than on minimal medium at 37°C whereas budding cells survive equally well on either medium. Though non-budding cells grown for irradiation on minimal or enriched media exhibit the same radiosensitivites, budding cells grown for irradiation on enriched medium are more susceptible to inactivation at 37°C than those grown on minimal medium. The particularly poor recovery by irradiated non-budding cells at 37°C is correlated with their unique tendency to undergo a transitory filamentation when initiating growth at that temperature. Evidence is presented that neither the filamentous growth per se nor the temporary inhibition of cell division associated with filamentation causes the poor recovery. Furthermore, while irradiated non-budding cells at 37°C exhibit singular susceptibility to inhibition of recovery by metabolic antagonists which disturb protein synthesis, the course of their filamentous growth is not affected by such agents. It is concluded that recovery from irradiation and the instigation of cytokinesis by non-budding cells of C. albicans result from different metabolic processes which may be related through a common temperature sensitive step.
C. albicans does not photoreactivate and observations on recovery by cells prevented from undergoing immediate postirradiation replication do not indicate the existence of a system for dark repair of DNA damage comparable to that occurring in bacteria. Difficulties attending a valid demonstration of DNA dark repair in yeasts are discussed.
27 citations
21 citations
TL;DR: This first documented account of Paleozoic insects in Antarctica bears on drift questions.
Abstract: A homopterous insect wing was found in micaceous graywacke from the Polarstar Formation, Sentinel Mountains. The unusual venation is reminiscent of family Stenoviciidae known from the Permian and Triassic of Eastern Australia and elsewhere. This first documented account of Paleozoic insects in Antarctica bears on drift questions.
16 citations
TL;DR: Findings are consistent with a previous proposal that a temperature dependent mechanism for dark recovery exists in C. albicans which involves synthesis of protein essential for repair of lethal, non-genetic uv damage.
Abstract: Candida albicans exhibits greater susceptibility to inactivation by ultraviolet (uv) radiation if grown before or after irradiation at 37° C rather than 25° C. Caffeine, acriflavin or amino acid analogues potentiate inactivation during postirradiation growth at 37° C but have little effect at 25° C. In contrast to inactivation, mutation induction by uv is unaffected by pre- or postirradiation growth temperatures or by metabolic antagonists. These findings are not explicable in terms of possible effects of growth temperatures on known mechanisms for repair of uv damaged DNA. They are consistent, however, with a previous proposal that a temperature dependent mechanism for dark recovery exists in C. albicans which involves synthesis of protein essential for repair of lethal, non-genetic uv damage.
11 citations
TL;DR: Saline extracts of various portions of the cockroach nerve cord were assayed on the isolated heart which had been pretreated with either atropine, eserine or picrotoxin, and the results seem to indicate the presence in the extracts of cholinergic and non-cholinergic cardioacceleratory substances as well as a Cholinergic inhibitory substance.
8 citations
6 citations
TL;DR: In this article, the authors constructed a model that does not use this hypothesis but produces in numerical studies the observed concentration gradient and an amplification of this effect with length, which is a weaker assumption than similar ones made in other models, that two salt concentrations take on stationary values, causes a linear initial value problem for a (2×2) first-order ordinary differential equation system to replace a (4×4) firstorder partial differential equation systems.
Abstract: The salient feature of a nephron is its tiny size, 6–10 μ in radius, since the fourth-power law requires a tiny flow rate even from a large pressure gradient. Along closely folded hairpin loops that are present in the nephrons of birds and mammals and are called loops of Henle, a salt concentration gradient forms in the ambient medullary tissue. Urine collects in this tissue in ducts, equilibrates with it osmotically, and produces a final product hypertonic to blood. Other authors explain the mechanism of this loop in terms of a hypothesis of active extrusion of a small amount of sodium from one branch of the loop and operation of a countercurrent multiplication principle. By close attention to realistic physical principles we construct a model that does not use this hypothesis but produces in numerical studies the observed concentration gradient and an amplification of this effect with length. A much weaker assumption than similar ones made in other models, that two salt concentrations take on stationary values, causes a linear initial value problem for a (2×2) first-order ordinary differential equation system to replace a (4×4) first-order partial differential equation system. Basic mechanisms used, such as back diffusion, were of no importance in previous square law models.
TL;DR: It may be useful, at least for now, to visualize the signal to stop growth in cell “contact inhibition” as electrical rather than chemical, as Chains of cells, which have been traced in tissue as low-resistance pathways, can be regarded as transmission lines with high-pass filter characteristics.
Abstract: It may be useful, at least for now, to visualize the signal to stop growth in cell “contact inhibition” as electrical rather than chemical Chains of cells, which have been traced in tissue as low-resistance pathways, can be regarded as transmission lines with high-pass filter characteristics Such lines could communicate cell contact signals deep into tissue No such signals would be received from (or by) cancerous tisdue cells on contact at one end of the line because such cells fail to form the low-resistance, low-capacitance junctions now believed to be formed by all normal cells in connective tissue
TL;DR: In this article, the conformity behavior of 16 black and 16 white male Ss, ages 7 and 11, was studied, using the Asch technique, in same race and opposite race, 3-member confederate groups.
Abstract: The conformity behavior of 16 black and 16 white male Ss, ages 7 and 11, was studied, using the “Asch technique” in same race and opposite race, 3-member confederate groups. Data showed that conformity was not a function of the race of Ss or the confederates. Age of Ss was a significant factor, conformity decreasing as age increased.
TL;DR: It is shown that cultural conditions which favor the appearance of variants in WC-7 populations create a metabolic stress within theWC-7 cells which leads to their direct transformation into variants, and these same conditions also impart a selective growth advantage to variant cells over WC- 7 cells.
Abstract: An adenine requiring strain ofCandida albicans, WC-7, forms large smooth colonies. When grown at 37° C under conditions of severe adenine deprivation, WC-7 cultures accumulate variant cells (MR variants) which produce minute, rough colonies. The variants are stable in that they persist upon repeated selective subculturing. However, they do exhibit high rates of reversion to their large, smooth colony progenitor form. It is shown that cultural conditions which favor the appearance of variants in WC-7 populations create a metabolic stress within the WC-7 cells which leads to their direct transformation into variants. These same conditions also impart a selective growth advantage to variant cells over WC-7 cells. Considerations of the genetic properties of the variants and the factors involved in their induction argue strongly that variant cells originate through alteration of a non-genic, hereditary determinant.
TL;DR: In this article, changes in the amounts of positronium formed in polyethylene and nylon 66 in the regions of phase transitions were studied by the two gamma angular correlation method.
TL;DR: In this article, a one-parameter Pohlhausen-type method with two integral equations momentum integral and energy integral was employed to solve the entrance region problem for viscous, electrically and thermally conducting fluid inside a parallel plate channel.
TL;DR: In this article, the same authors presented data which appears to support their assumption of a personality-related variable, i.e., time perspective, which is viewed as a process closely associated with aging, that is, as an individual ages his time perspective tends to affect his attitudes.
Abstract: In earlier studies the same authors presented data which appears to support their assumption of a personality-related variable, &dquo;time perspective&dquo; (Back and Gergen, 1963, pp. 427-42). Briefly, the variable is viewed as a process closely associated with aging, that is, as an individual ages his time perspective tends to affect his attitudes. Specifically, this effect is manifested in the con-
TL;DR: The development of biotelemetry is traced out from its beginnings with the transistor 20 years ago and the endoradiosonde about 10 years ago, and possible applications of the technique are considered in relation to child study.
TL;DR: Necessary and sufficient conditions for existence of smooth solution to quasi-linear partial differential equation are given in this paper, where a smooth solution is defined as a solution to a set of problems.