A history of the establishment of the Rural Electrification Administration and the Brazos Electric Power Cooperative.

The life history and ecology of Neochoroterpes mexicanus was studied from data collected September, 1971, to August, 1972, and January to December, 1973, in the Brazos River, Texas. Nymphal development, instar analysis, voltinism, standing crops, and production estimates were determined from the quantitative samples taken in 1971 and 1972. Aspects of the life history and food habits of 230 specimens were arrived at from qualitative samples and light box captures in 1973. Laboratory investigation in 1973 helped in establishing instar analysis, egg incubation and description, and first instar descriptions. Neochoroterpes mexicanus appeared to have three generations per year with brood overlap in the summer and fall. It displayed 16 and 19 instars for overwintering and combined summer generations respectively.

The Cretaceous–Paleogene (K/Pg) boundary marks one of the major crises in the history of life on Earth. The cause is widely regarded as a large bolide impact at Chicxulub, Mexico, coincident with a major series of volcanic eruptions on the Deccan Plateau, India. Fieldwork in the Brazos River area of Texas has involved an investigation of the sections on the Brazos River and its tributaries. A previously overlooked K/Pg section (RBS) on the Brazos River was found and contains the most accessible and complete K/Pg boundary succession in the area. The RBS succession provides a clear exposure of the various lithological units within the Paleocene and was used to correlate to the successions in the nearby creeks. The K/Pg boundary is also well-exposed and records an erosional relief of ~1 m, cut into the Maastrichtian mudstone succession, creating a mounded topography. The overlying ‘Event Bed’, containing reworked impact spherules at its base, is shown to infill troughs on this irregular surface. The same features were recorded in tributary creeks, with all previous descriptions of these locations clearly failing to recognise the various sedimentary relationships. Distinct, thin, yellow clay horizons within the uppermost Maastrichtian mudstones are present in some sections. Geochemical analysis and radiometric dating have confirmed these as volcanic ashes, with extracted zircons giving a date of 65.95+0.04 Ma. These ash bands are located in Maastrichtian mudstones just below the K/Pg boundary and the recorded date is, within error, that of the K/Pg boundary. This identification of this latest Maastrichtian volcanic ash negates the suggestion of a pre-K/Pg boundary impact, a pre-extinction impact or multiple impacts. The benthic foraminiferal data generated indicates significant changes in palaeoecology of the benthic foraminifera across the K/Pg boundary. The benthic foraminifera do not experience a mass extinction, unlike the planktic foraminifera, which were significantly affected by the end-Maastrichtian extinction event. The benthic foraminferal assemblage appears to only experience transient, short-lived changes with pulses of agglutinated, elongate and large species in the early Paleocene. Mono-specific samples of Lenticulina rotulata have been analysed for stable isotopes and the data may indicate the presence cyclicity across the K/Pg boundary interval. In the earliest Paleocene significant negative δ18O excursions near the Pα/P1a and NP1/NP2 boundary represents a potential hyperthermal event that may be coeval with the DAN-C2 and Lower C29n events respectively recorded at Gubbio, and in the Atlantic Ocean. A sequence stratigraphy package is determined based on the micropaleontology and sedimentology in the Brazos River area. The latest Maastrichtian is marked by a sealevel rise immediately before the K/Pg boundary. Immediately after the K/Pg event, sealevel fell and is recorded as a change from mid to inner shelf. The condensed unit of the Middle Sandstone Bed (MSB) represents a Transgressive systems tract, with increasing diversity and abundance of benthic foraminifera to the top of the MSB, where maximum abundance and diversity is marks a Maximum Flooding Surface. The interval above indicates sea-level continuing to rise to a mid to outer-shelf setting. These sealevel changes are also recorded at the same stratigraphic level in Alabama, and at more distal K/Pg boundary sections (e.g., Denmark and Tunisia) suggesting that these sealevel changes are eustatically controlled.

Populations of all stages of three species of Hydropsychidae, Hydropsyche simulans, Cheumatopsyche campyla, and Cheumatopsyche lasia were sampled fro September, 1971, to August, 1972, on the Brazos River in Palo Pinto County, Texas. Supplemental observations relating to emergence, mating and oviposition, and larvae food habits were continued to July, 1973. The purpose of this study was to elucidate the life cycles and ecology of this Hydropsychidae complex.

El presente trabajo de investigación tiene como objetivo diseñar conceptualmente una prótesis de codo con activación híbrida para personas con un nivel de amputación del brazo por encima del codo, lo cual consiste en integrar los métodos de actuación eléctrica y accionamiento por los movimientos del cuerpo. Ello se realiza con el fin de aprovechar y fusionar sus ventajas para lograr un precedente en el campo de investigación de las prótesis transhumerales híbridas, el cual no ha sido investigado debidamente en comparación con el aumento de casos de amputaciones transhumerales. Este trabajo realizará un estudio al estado del arte de distintas prótesis transhumerales, las cuales se usarán de referencia al momento de generar conceptos de solución. Estas soluciones cumplirán con los requerimientos y estructura de funciones planteados previamente. Además, las soluciones serán evaluadas de manera económica y técnica a fin de llegar a una solución óptima. Para terminar, se llega a un diseño conceptual óptimo que logra la sinergia de ambos modos de actuación y permite un control moderado de los movimientos de flexoextensión del codo protésico. En conclusión, se realiza un diseño conceptual de la prótesis de la articulación del codo que realiza los movimientos de flexoextensión fusionando los métodos de actuación descritos y que funciona como apoyo de los miembros remanentes. Asimismo, se logra integrar el control mioeléctrico que permite corregir los movimientos accionados por el cuerpo, con la ventaja de no usar constantemente los actuadores y con ello se reduce el peso de los actuadores y la batería respecto a una prótesis puramente mioeléctrica.

The purpose of this report is threefold: 1) to provide a description and discussion of research undertaken in the Aquilla Lake area, Hill County, Texas, in 1979 and 1980; 2) to propose a regional research design for the entire Central Brazos region; and 3) to analyze evidence from the Aquilla investigations in terms of the proposed regional perspective. / text

Thesis (M.E.S.)--Baylor University, 2008. / Includes bibliographical references (p. 52-57)

Thesis (Ph. D.)--University of Texas at Austin, 2004. / Supervisor: David R. Maidment. Vita. Includes bibliographical references. Also available from UMI.

Made available in DSpace on 2014-06-11T19:26:41Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-02-24Bitstream added on 2014-06-13T19:54:53Z : No. of bitstreams: 1 dias_jpt_me_botfca.pdf: 2425163 bytes, checksum: 11fa8bbe7cf0003639b0ab466f25c25d (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Objetivou-se estudar os efeitos de citocinina e bioestimulante (citocinina/giberelina) para promover brotações em estacas de raízes e de auxina para promover a formação de raízes nessas brotações, com isso, propondo uma alternativa para a produção de mudas da amoreira-preta. O primeiro experimento constou de cinco concentrações de 6-benziloaminopurina (BAP), na forma de solução: T1= 0 mg L-1; T2= 100 mg L-1, T3= 200 mg L-1, T4= 400 mg L-1 e T5= 800 mg L-1, aplicadas em toda a estaca de raiz por imersão durante 18 horas, distribuídas em quatro repetições, sendo a parcela de 15 estacas radiciais. No segundo experimento adotou-se cinco concentrações do bioestimulante Promalin® na forma de solução: T1= 0 mg L-1; T2 = 10 mg L-1, T3= 20 mg L-1, T4= 40 mg L 1 e T5= 80 mg L-1. Posteriormente, as estacas radiciais foram mergulhadas nessas soluções durante 12 horas. Utilizaram-se sete repetições, com a parcela constituída por uma bandeja com 10 estacas radiciais, durante 70 dias. A aplicação dos reguladores vegetais, BAP e PromalinÒ, em concentrações altas inibiram o desenvolvimento de brotações em estacas radiciais de amoreira-preta e as características de desenvolvimento dessas brotações, sendo os melhores resultados alcançados sem a aplicação dos reguladores vegetais. Posteriormente, as estacas de raízes de amoreira-preta (sem aplicação de regulador vegetal) foram coletadas de plantas matrizes e colocadas em câmara de nebulização, sendo dispostas em bandejas de polietileno brancas, com casca de arroz carbonizada, conforme o melhor tratamento. Após 60 dias, procedeu-se a retirada das brotações das estacas radiciais, com o corte rente à estaca. Foi feita a seleção e padronização das estacas de brotações, sendo deixadas com altura de dez centímetros e três a quatro folhas por broto, utilizadas para a instalação do terceiro experimento... / The objective was to study the effects of cytokinin and plant growth regulators (cytokinin/gibberellin) to promote shoot growth on root cuttings and auxin to promote root formation in these shoots with that proposing an alternative for the production of seedlings of blackberry. The first experiment consisted of five concentrations of 6- benzylaminopurine (BAP): T1= 0 mg L-1, T2= 100 mg L-1, T3= 200 mg L-1, T4= 400 mg L- 1 and T5= 800 mg L-1, applied across the cutting immersed for 18 hours, divided into four replicates of plot share of 15 root cuttings. The second experiment has five Promalin ®concentrations: T1= 0 mg L-1, T2= 10 mg L-1, T3= 20 mg L-1, T4= 40 mg L-1 and T5= 80 mg L-1, then the root cuttings were dipped in these solutions for 12 hours. Seven replicates were used with the plot had a tray with 10 root cuttings during 70 days. The application of BAP and PromalinÒ in high concentrations inhibited the shoots development in root cuttings of blackberry and the best results was without the application of plant growth regulators. The root cuttings of blackberry (without aplicacation of plant growth regulator) were colleted from stock plants and placed in a mist chamber, being arranged in white polyethylene trays with carbonized rice hull, as the best treatment. After 60 days, we proceeded to the removal of the shoots, cut flush with the close root cutting. It was made the selection and standardization of shoot cuttings, being left with a height of ten inches and three to four leaves per shoot, used for the installation of the third experiment. The treatments consisted of six concentrations of indole-3-butyric acid (IBA): T1= 0 mg L-1, T2= 250 mg L-1, T3= 500 mg L-1, T4= 1000 mg L- 1, T5= 2000 mg L-1 and T6= 4000 mg L-1 applied on the basis of shoot cuttings for ten seconds, in six replication of 12 shoots, for 60 days. The highest concentrations of IBA inhibited root development... (Complete abstract click electronic access below)

El presente trabajo de tesis está enfocado en el desarrollo de una metodología de ensayos para evaluar las propiedades mecánicas de prótesis de miembro superior activadas por muñeca, fabricadas mediante el proceso de manufactura aditiva de modelado por deposición fundida. Actualmente, existen normas para evaluar prótesis de miembros inferiores y de cadera, sin embargo, la información disponible sobre cómo evaluar prótesis de miembro superior es muy escasa. Este trabajo representa una contribución para suplir la falta de normativa y procedimientos estándares para evaluar prótesis de miembro superior activadas por muñeca. La metodología desarrollada y los ensayos tecnológicos propuestos permiten determinar las propiedades mecánicas de la prótesis y sus capacidades máximas de carga. La metodología desarrollada fue validada mediante la aplicación en un diseño de prótesis perteneciente al proyecto “Dando una Mano”. Los resultados fueron satisfactorios y contribuyeron con la elaboración de una propuesta de optimización en el diseño de la prótesis evaluada. Los ensayos se llevaron a cabo en el Laboratorio de Materiales PUCP y los componentes de la prótesis fueron fabricados en el Laboratorio de Manufactura Digital VEO 3D PUCP. Este trabajo de tesis fue financiado por el CONCYTEC-FONDECYT en el marco de la convocatoria Proyecto Investigación Básica y Aplicada, 2017-02, titulado: Optimización del uso de polímeros sintéticos en procesos de manufactura aditiva mediante modelos de simulación computacional y técnicas de caracterización de materiales. Caso de estudio: aplicaciones médicas en prótesis de mano [Contrato N° 163-2017- FONDECYT]. Y los resultados han sido publicados en la revista “Advances in Science, Technology and Engineering Systems Journal” en un artículo titulado “Mechanical Testing Methods for Body-Powered Upper-Limb Prostheses: A Case Study”.