A Review of Geriatric Communication

Communication errors are rampant in our society and no population is exempt from this problem. This article takes a closer look at communication accommodation theories, specifically under and overaccommodation. These are two predominant communication errors that healthcare workers and geriatric patients both experience while working together

Gas core rocket reactors - A new look

Feasibility analysis of open-cycle gas-core nuclear rocket engin

Real-time simulation model of the HL-20 lifting body

A proposed manned spacecraft design, designated the HL-20, has been under investigation at Langley Research Center. Included in that investigation are flight control design and flying qualities studies utilizing a man-in-the-loop real-time simulator. This report documents the current real-time simulation model of the HL-20 lifting body vehicle, known as version 2.0, presently in use at NASA Langley Research Center. Included are data on vehicle aerodynamics, inertias, geometries, guidance and control laws, and cockpit displays and controllers. In addition, trim case and dynamic check case data is provided. The intent of this document is to provide the reader with sufficient information to develop and validate an equivalent simulation of the HL-20 for use in real-time or analytical studies

The psychology of the Negro

Thesis advisor: W.H. PyleTypescriptM.A. University of Missouri 1914The problems of race psychology have always been of absorbing interest. The existence of racial differences in intellect, morals and temperament is a matter of common observation among historians and anthropologists. It has always been regarded as obvious that those races which were most advanced in civilization were, in point of view of mental ability, distinctly higher than the others. And yet there are numerous instances in history, in which a barbarian race has taken on the forms of civilization and proven itself distinctly not inferior. No way of definitely measuring racial mental differences has been known until recently when, with the development of psychology, that science began to concern itself with individual differences. In America where all races meet, the problem of racial differences is an important one for our educational theory and practice, as well as our social philosophy. This is especially true in our Southern States, where there are vast numbers of white and colored children receiving the same instruction, both in content and in method. Are the mental characteristics of the two races similar enough to justify similar instruction, or would difference in instruction be more economical in effort and secure better results? The object of this investigation is not to answer this question, but to discover a few of the facts which have a bearing on it. To this end, an attempt is made to measure some of the basic mental functions of Negroes by means of already established mental tests. No attempt is made to justify the use of these tests. Their limitations are evident, but their value has been proved by numerous investigations during the past few years. Numerous books of a sociological and philosophical nature have been written concerning the Negro. They are valuable, chiefly, as the opinions of men of considerable experience, and frequently of strong prejudices. The results of three investigations of Negro psychology of some real value have been published. A brief review of these articles is give

A study of the relationship between the size of the physiological blindspot as plotted with the Davidsen-Wottring caecanometer and visual acuity under reduced or minimal illumination

A study of the relationship between the size of the physiological blindspot as plotted with the Davidsen-Wottring caecanometer and visual acuity under reduced or minimal illuminatio

Some Nuclear Calculations of U-235-D2O Gaseous-Core Cavity Reactors

The results of a multigroup, diffusion theory study of spherical gaseous-core cavity reactors are presented in this report. The reactor cavity of gaseous U235 is enclosed by a region of hydrogen gas and is separated from an external D2O moderator-reflector by a zirconium structural shell. Some cylindrical reactors are also investigated. A parametric study of spherical reactors indicates that, for the range of variables studied, critical mass increases as: (1) Fuel region is compressed within the reactor cavity, (2) moderator thickness is decreased, (3) structural shell thickness is increased, and (4) moderator temperature is increased. A buckling analogy is used to estimate the critical mass of fully reflected cylindrical reactors from spherical results without fuel compression. For a reactor cavity of a 120-centimeter radius uniformly filled with fuel, no structural shell, a moderator temperature of 70 F, and a moderator thickness of 100 centimeters, the critical mass of a spherical reactor is 3.1 kilograms while that of a cylinder with a length-to-diameter ratio of 1.0 (L/D = 1) is approximately 3.8 kilograms and, with L/D = 2, 5.9 kilograms. For the range of variables considered for U235-D2O gaseous-core cavity reactors, the systems are characterized by 95 to 99 percent thermal absorptions, with the flux reaching a maximum in the moderator about 10 to 15 centimeters from the reactor cavity

Initial Investigation of Reaction Control System Design on Spacecraft Handling Qualities for Earth Orbit Docking

A program of research, development, test, and evaluation is planned for the development of Spacecraft Handling Qualities guidelines. In this first experiment, the effects of Reaction Control System design characteristics and rotational control laws were evaluated during simulated proximity operations and docking. Also, the influence of piloting demands resulting from varying closure rates was assessed. The pilot-in-the-loop simulation results showed that significantly different spacecraft handling qualities result from the design of the Reaction Control System. In particular, cross-coupling between translational and rotational motions significantly affected handling qualities as reflected by Cooper-Harper pilot ratings and pilot workload, as reflected by Task-Load Index ratings. This influence is masked but only slightly by the rotational control system mode. While rotational control augmentation using Rate Command Attitude Hold can reduce the workload (principally, physical workload) created by cross-coupling, the handling qualities are not significantly improved. The attitude and rate deadbands of the RCAH introduced significant mental workload and control compensation to evaluate when deadband firings would occur, assess their impact on docking performance, and apply control inputs to mitigate that impact

DNA Methylation Differs in Bluegill Among Temperate, Anthropogenically Warmed, and Tropical Lakes

Epigenetic mechanisms can alter gene expression and phenotypes in organisms responding to environmental changes. Within environmental parameters, temperature changes are notably the most pervasive abiotic factor for ectotherms, directly affecting organismal survival and fitness. The goal of this study was to investigate the scale of DNA methylation in populations of a cosmopolitan freshwater species occupying disparate thermal regimes. DNA methylation levels were compared among bluegill sunfish (Lepomis macrochirus) populations from an ambient temperature, temperate lake (Lake Mattoon), a nearby power plant-cooling lake (Lake Coffeen), and a tropical lake (Lake Lucchetti). We used epiRADseq to screen levels of DNA methylation at 105,811 loci among fish. We found levels of total DNA methylation increased among specimens as water temperature of lakes increased from the ambient temperature, temperate lake to the tropical lake. We identified loci with statistically significant differences in the frequency of DNA methylation among individuals between lakes: 654 loci between Lake Mattoon and Lake Lucchetti fish and 373 loci between Lake Coffeen and Lake Lucchetti fish. Considering that a previous study on the same power plant-cooling reservoirs showed a shorter lifespan, decrease in growth performance, and the populations skewed towards younger fish, this study observed DNA methylation pattern may be an important mechanism contributing to the observed phenotypic variations in bluegill from a anthropogenically-warmed lake compared to an ambient temperature lake. Our study suggests that epigenetic regulation of phenotypic plasticity in aquatic organisms may be a critical factor in understanding the organismal response to environmental stress

Concert recording 2018-04-21c

[Track 1]. Canto / Elliot Carter -- [Track 2]. Temporarily untitled / Drew Morris -- [Track 3]. Wicca / Casey Cangelosi -- [Track 4]. Marimba spiritual / Minoru Miki -- [Track 5]. Connecticut halftime / American traditional