Range imager performance comparison in homodyne and heterodyne operating modes

Range imaging cameras measure depth simultaneously for every pixel in a given field of view. In most implementations the basic operating principles are the same. A scene is illuminated with an intensity modulated light source and the reflected signal is sampled using a gain-modulated imager. Previously we presented a unique heterodyne range imaging system that employed a bulky and power hungry image intensifier as the high speed gain-modulation mechanism. In this paper we present a new range imager using an internally modulated image sensor that is designed to operate in heterodyne mode, but can also operate in homodyne mode. We discuss homodyne and heterodyne range imaging, and the merits of the various types of hardware used to implement these systems. Following this we describe in detail the hardware and firmware components of our new ranger. We experimentally compare the two operating modes and demonstrate that heterodyne operation is less sensitive to some of the limitations suffered in homodyne mode, resulting in better linearity and ranging precision characteristics. We conclude by showing various qualitative examples that demonstrate the system’s three-dimensional measurement performance

Instructional Systems and Curriculum Development

The field of curriculum development is one of vital significance with respect to the field of education as a whole. This field represents a complex and sometimes worrisome aspect of educational administration. Many of the problems of today\u27s system stem from inadequacies in the curriculum. This thesis is presented as a possible aid in the correcting of three of curriculum development\u27s most significant concerns: relevancy, accountability, and individualization. The statement of the thesis problem is: How can the integration of instructional systems aid in making curriculum more relevant, accountable, and individual? It is the proposal of this thesis to answer this question by presenting content material in two specific areas: curriculum development and instructional sysyems. Background material is presented in both areas to acquaint the reader the basic principles and, drawing from this material, develops the rationale that will answer the thesis question. Information is provided that will be of value to all who are interested in this area. It assumes a rather modest entry level with respect to instructional systems and is, therefore, beneficial to those who are un-acquainted with this topic

A practical method for studying the reversible phases of pyocyanin

Departamento de Microbiología (Sociedad Anónica de Frigorifico Anglo -Buenos Aires (Argentina))Cultures of Pseudomonas aeruginosa, are incubated in agar Slopes at 25°. C. 2,5 ml. choloroform are added to each tube to dissolve the pigment and Strips of Whatman Nº1 filter paper are introduced, letting the solution travel up the Strips. The latter are taken out and, being quicky dried in the air, are put into acetone which rises, carrying with it the blue pigment which gradually turn yellow, through bluegreen and yellow-green.To test if it is pyoxanhose, the strips are put into a 20 %. Hydrochloric acid solution, this being an easy and very illustrative method.Cultivos de Pseudomonas aeruginosas en agar inclinado a 250 C. Añade a cada tubo cloroformo para disolver el pigmento e introduce tiras de papel Whatman núm. 1 dejando subir por ellas la solución: secado al aire. Introduce la tira en acetona y la deja que ascienda, arrastrando el pigmento azul, el cual cambia al amarillo, pasando por verde azulado y verde amarillento. Comprueba que se trata de Pioxantosa por el color rojo que toman las tiras del papel con ácido clorhídrico al 20%. Método fácil y muy demostrativo

Explaining the Effects of Pay Variation on Individual Outcomes

Compensation is an area of research rife with debate among experts. These debates are primarily concerned with the effectiveness of pay-for-performance. The pay variation and performance relationship is a subset of this research where disagreement and inconclusive findings are common. Is pay variation conducive to higher performance or is pay compression ideal? This study contributes to the pay variation and performance debate by focusing on performance-based pay variation and addressing fundamental assumptions of prior work. Past research has treated pay variation as a proxy for allocation rules and incentive intensity. Separating these two constructs rather than confounding them provides a more comprehensive treatment. This study addresses the effects of these two policies, incentive intensity and allocation rules, as separate, independent influences on performance outcomes. Incentive intensity is treated as a range of potential pay outcomes, whereas the allocation rule is an approach to distributing rewards either based on individual contribution or equally to members of a group. While theories predict individual level performance is affected by pay variation, tests of these theories are typically at the organizational level. In this study, the effects of pay variation policies are tested at the individual level using an experimental design. In addition to testing the relationship between pay variation policies and individual performance, expectancy theory as an explanatory framework is explored. Allocation rules and incentive intensity are predicted to affect the motivational mechanisms described by expectancy theory, which in turn influence individual motivation and performance. Results of a real pay/real effort experiment provide evidence that allocation rules affect objective individual performance while changes in incentive intensity are not significant in predicting objective performance. Objective performance is significantly higher in equity allocation rule conditions than in equality allocation rule conditions. In addition, expectancy theory components are affected as predicted; these components are positively related to motivation, and motivation is positively related to both subjective and objective individual performance measures

Observations on the ocurrence of pseudomonas aeruginosa in a sample of well water

The author is indebted to Prof. Dr. Luis C. Verna of this Cátedra, for having encouraged the preparation of this paper and for his interest in the work described.A sample of well water was examined, and it was found that the total bacterial count and the coliform count were of no significance in condemning the water as unsuitable for drinking purposes. Pseudomonas aeruginosa was found to be the predominating organism present and the possible relationship between this organism and those of the coliform group is considered. Reference to recent published work is made, in an attempt to show that the sample received should rightly be regarded as having been contaminated from faecal or sewage sources.Una muestra de pozo de agua fue examinada,y se encontró que el recuento total de bacterias y el recuento de coliformes carecian de importancia como para decidir si el agua es no apta para beber.Se descubrió que Pseudomonas aeruginosa era el organismo predominante y se considera que existe una posible relación entre este organismo y los del grupo de coliformes.La muestra recibida debería ser considerada como que ha sido contaminada con aguas residuales o fecales,refiriendonos a la reciente obra publicada.Cátedra de Microbiología, Inmunología y Serología