Papers by JOHN ALEXANDER FLORES TAPIA
Analysis of the Reflected Wave Arrival Position in Timber Specimens Emitted by GPR with an Antenna of 1.6 ghz
Springer eBooks, 2014
This work was focused on the establishment of the best criterion to perform the readings of the a... more This work was focused on the establishment of the best criterion to perform the readings of the amplitudes of the waves emitted by ground-penetrating radar, when timber specimens were inspected with an antenna of 1.6 GHz. This is a critical parameter when we are dealing with near-field readings, since no unique definition of this point has reached an agreement in the literature.
Preliminary results on students' study habits and their grades in STEM courses
This short manuscript presents our preliminary results on students' study habits and the impa... more This short manuscript presents our preliminary results on students' study habits and the impact of these habits on their grades. Preliminary data related to three engineering classes is presented.
An iterative total least squares‐based estimation method for structural damage identification of 3D frame structures
Structural Control and Health Monitoring, 2020
Identifying structural damage can usually be modeled as a problem with the use of linear equation... more Identifying structural damage can usually be modeled as a problem with the use of linear equations. Due to measurement noise and spatial incompleteness of the measured mode shapes, these linear equations are usually ill conditioned, which will significantly reduce the accuracy of subsequent damage assessment. This study develops an iterative total least squares (TLS) based estimation method, which can effectively mitigate such ill conditioning and avoid propagating noise into estimates of structural damage severity. In particular, a procedure, called the δ–p curve method, is proposed to choose the effective rank of a TLS estimation. Further, an iterative approach of TLS‐based estimation is proposed to eliminate spurious damage estimates due to modal expansion and measurement noise. To investigate the effectiveness of the proposed iterative TLS‐based estimation method, detailed numerical studies of damage assessment are first conducted on a simulated 3D frame structure, in which both noise pollution and spatial incompleteness of the mode shapes are considered. Additionally, experimental tests with a laboratory structure are performed to validate the proposed method. Results indicate that the proposed iterative TLS‐based method can accurately identify the structural damage, even with noise‐polluted and spatially incomplete modes.
Measurement, 2019
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Actualidades Investigativas en Educación, May 1, 2018
Los contenidos de este artículo están bajo una licencia Creative Commons Tendencias de investigac... more Los contenidos de este artículo están bajo una licencia Creative Commons Tendencias de investigación en formación permanente de profesores: estado del arte e interpretación de actores clave Research trends in teacher training: state of the art and interpretation of key actors Volumen 18, Número 2
Circuit chautauqua's promotional visions: a study of program brochures, circa 1904 to 1932
This item was digitized from a paper original and/or a microfilm copy. If you need higher-resolut... more This item was digitized from a paper original and/or a microfilm copy. If you need higher-resolution images for any content in this item, please contact us at repository@u.library.arizona.edu
Rhetoric and Centers of Power in the Greco-Roman World: From Homer to the Fall of Rome
Chapter 1 Preface Chapter 2 Acknowledgements Chapter 3 Foreword Chapter 4 Introduction Chapter 5 ... more Chapter 1 Preface Chapter 2 Acknowledgements Chapter 3 Foreword Chapter 4 Introduction Chapter 5 Chapter I: Origins of Rhetorical Theory and Practice Chapter 6 Chapter II: Greek Theory and Practice Chapter 7 Chapter III: From Greece to Rome Chapter 8 Chapter IV: Cicero's Rome Chapter 9 Chapter V: The Early Roman Empire Chapter 10 Chapter VI: The Second Sophistic Chapter 11 Chapter VII: "The Sign of the Cross" Chapter 12 Epilogue Chapter 13 Glossary Chapter 14 Works Cited Chapter 15 Select Bibliography Chapter 16 Index
Movimento (ESEFID/UFRGS), 2012
O presente trabalho sistematiza a abordagem qualitativa de um projeto patrocinado pelo Ministério... more O presente trabalho sistematiza a abordagem qualitativa de um projeto patrocinado pelo Ministério de Educação do Chile, em função de desenvolver um instrumento de observação de aulas de Educação Física para o Ensino Geral Básico (Educação Básica) nos estabelecimentos com financiamento público. O mencionado instrumento tem como objetivo favorecer processos de diálogo disciplinar e melhora no desempenho didático dos profissionais da área. O trabalho qualitativo se desenvolveu em etapas sucessivas e complementares: revisão de literatura específica, bem como as expressões e percepções de estudantes do último ano do curso de Educação Física e de professores que trabalham em escolas que são subsidiadas com fundos públicos do citado Ministério. Da confluência das mencionadas fontes se estabeleceram três dimensões do desempenho didático, a saber: gestão, ação e saber didático. Como resultados se buscou depurar e definir os indicadores de cada dimensão, como também pesquisar indicações de im...
Magallania (Punta Arenas), 2018
Estenosis rectal benigna por linfogranuloma venereo
Vozandes, Nov 1, 1997
Land Without Liberty: Continuities of Peripheral Capitalist Development and Peasant Exploitation Among the Cane Growers of Morelos, Mexico
Latin American Perspectives, 1982
... As a result, the mill is able to avoid virtually all surplus redistribution (although social ... more ... As a result, the mill is able to avoid virtually all surplus redistribution (although social security repre-sents an imDortant cost for the mill, as well as an incentive for many cane 4See BonillaMachorro (1975), Quesada A. and Tapia S. (1977), various articles in Excelsior (1974 ...
Energy Procedia, 2014
Carbon capture and storage (CCS) can be carried out in conjunction with enhanced oil recovery (EO... more Carbon capture and storage (CCS) can be carried out in conjunction with enhanced oil recovery (EOR) to yield complementary environmental and economic gains. Thus, CCS in combination with EOR will provide economical value from incremental oil recovery besides providing source for CO2 sequestration. Given a fixed CO2 supply to be distributed to different reservoirs, it is necessary to develop an allocation model to maximize profit from EOR operations. In this study, a discrete-time optimization model is developed subject to scheduling, capacity and flow rate constraints. A case study is presented to illustrate the model.
Circuit Chautauqua program brochures: A study in social and intellectual history
Quarterly Journal of Speech, 1981
An examination of the promotional brochures distributed by the chautauqua circuits between 1904–1... more An examination of the promotional brochures distributed by the chautauqua circuits between 1904–1932 illustrates how they reflected the social‐intellectual themes of the period and how they adapted to changing audiences and markets.
Fuzzy optimization of multi-period carbon capture and storage systems with parametric uncertainties
Process Safety and Environmental Protection, 2014
Abstract Carbon capture and storage (CCS) is an important technology option for reducing industri... more Abstract Carbon capture and storage (CCS) is an important technology option for reducing industrial greenhouse gas emissions. In practice, CO2 sources are easy to characterize, while the estimation of relevant properties of storage sites, such as capacity and injection rate limit (i.e., injectivity), is subject to considerable uncertainty. Such uncertainties need to be accounted for in planning CCS deployment on a large scale for effective use of available storage sites. In particular, the uncertainty introduces technical risks that may result from overestimating the limits of given storage sites. In this work, a fuzzy mixed integer linear program (FMILP) is developed for multi-period CCS systems, accounting for the technical risk arising from uncertainties in estimates of sink parameters, while still attaining satisfactory CO2 emissions reduction. In the model, sources are assumed to have precisely known CO2 flow rates and operating lives, while geological sinks are characterized with imprecise fuzzy capacity and injectivity data. Three case studies are then presented to illustrate the model. Results of these examples illustrate the tradeoff inherent in planning CCS systems under parametric uncertainty.
Clinical Neuropharmacology, 2005
Quetiapine is an atypical antipsychotic with sedative properties frequently used to treat halluci... more Quetiapine is an atypical antipsychotic with sedative properties frequently used to treat hallucinations and psychosis in Parkinson disease (PD). The objective of this trial is to evaluate quetiapine for insomnia in nonpsychotic PD patients. Fourteen consecutive PD patients with frequent insomnia and without psychotic symptoms were treated openly for 12 weeks with a single evening dose of quetiapine. The dose was adjusted according to clinical improvement and tolerance. The severity of insomnia was assessed using the Pittsburgh Sleep Quality Index (PSQI), daytime sleepiness was evaluated with the Epworth Sleep Scale (ESS), and motor performance was evaluated using the motor section of the Unified Parkinson's Disease Rating Scale (UPDRS). All evaluations were done before and 1, 2, and 3 months after initiation of treatment. Total PSQI basal scores were 13.6 6 3.7 points. The PSQI score improved in 11 patients and was reduced by 3.8 6 3.9 points by the end of the study (P , 0.01). The ESS score was reduced by 4.3 6 3.7 points (P , 0.01). The mean quetiapine dose was 31.9 mg/day. No significant change was observed in the motor scale. Two patients were discontinued due to nonserious adverse effects. These results suggest that quetiapine may be a safe and effective treatment of insomnia in PD patients. Doubleblind studies will probably confirm these findings.
The Indian in the Spanish-American Novel
Chasqui, 1980
Circuit Chautauqua: From rural education to popular entertainment in early twentieth century America
The American Historical Review, 2006
, D.C. Disturbing passages describe the primitive (indeed, all but nonexistent) safety and enviro... more , D.C. Disturbing passages describe the primitive (indeed, all but nonexistent) safety and environmental standards at these facilities, and the high casualty rates among the researchers and workers. The legacy of these two facilities persists in heavily populated sectors of northwest Washington; indeed, as Vilensky points out, extremely high arsenic levels are common on American University property, and, even in 2001, prompted the relocating of the childcare center. Once lewisite showed promise as a weapon, facilities for its production were established outside Cleveland, in Willoughby, Ohio. The CWS was so enthusiastic about the prospects for lewisite that it quickly readied the Willoughby facility (an abandoned auto factory) under the supervision of James Bryant Conant, a professor of chemistry who would later go on to become the president of Harvard University, and deeply involved in the development of the atomic bomb. But the war ended just as the facility was ready to swing into fullscale wartime production. Only the first five chapters of the book concern themselves directly with the history of gas weapons in World War I. Vilensky goes on to examine the interwar history of lewisite, and BAL, the history of chemical weapons in World War II, and the serious environmental problems raised by lewisite and other chemical weapons in U.S. and international arsenals. He includes an examination of the sea dumping (off the U.S. coast) of tens of thousands of tons of lewisite, and an overview of lewisite production outside the United States. This interesting, eclectic book will appeal especially to those who study the history of science and environmental history.
Education in the Knowledge Society (EKS), 2021
El acceso a las nuevas Tecnologías de la Información y Comunicación por parte de la población se ... more El acceso a las nuevas Tecnologías de la Información y Comunicación por parte de la población se han incrementado en los últimos años, lo que ha llevado a que estas se integren de manera natural a la vida diaria de las personas. El ámbito educativo y empresarial sin duda son los sectores que mayores beneficios han obtenido con estos avances, tanto en lo positivo como de lo negativo. El presente estudio tiene por finalidad analizar la relación entre la aceptación tecnológica y la adicción a las redes sociales en estudiantes universitarios de la ciudad de Arequipa, Perú. La población estuvo conformada por estudiantes del segundo ciclo de 46 escuelas profesionales de la Universidad Nacional de San Agustín de Arequipa. Para la selección de la muestra se recurrió a un procedimiento no probabilístico incidental, seleccionando en total n=2470 estudiantes. Los instrumentos aplicados fueron el modelo de aceptación tecnológica (TAM), diseñada por Yong y el Cuestionario de Adicción a las Redes...
Nivel De Conocimiento y Habilidades Prácticas en La Asignatura De Física De Las Escuelas Profesionales De Ingeniería De La Universidad Católica De Santa María, Arequipa, 2016
La presente investigacion tiene por objeto relacionar el nivel de conocimientos y las habilidades... more La presente investigacion tiene por objeto relacionar el nivel de conocimientos y las habilidades practicas en el curso de Fisica Basica de los estudiantes del II semestre de las escuelas profesionales del area de Ingenieria tales como Arquitectura, Ingenieria Industrial, Ingenieria Mecanica, Mecanica Electrica y Mecatronica e Ingenieria Electronica de la Universidad Catolica de Santa Maria de Arequipa-Peru. El tamano de la muestra fue de 80 estudiantes de las diferentes escuelas mencionadas anteriormente. Se realizo un estudio observacional, transversal y de nivel relacional. Las variables han sido investigadas y se ha recopilado la informacion mediante un formulario de preguntas y fichas de observacion. Ambas variables para su procesamiento han requerido del chi cuadrado con un nivel de significancia del 5%. Se encontro que el nivel de conocimientos de los estudiantes de ingenieria fue regular y en cuanto a las habilidades practicas tambien se obtuvo un nivel regular. Asimismo, se...
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Papers by JOHN ALEXANDER FLORES TAPIA