Papers by jose miguel apaza centeno
Sliding shear is often the governing failure mechanism in ductile reinforced masonry (RM) squat s... more Sliding shear is often the governing failure mechanism in ductile reinforced masonry (RM) squat shear walls in low-rise buildings designed according to seismic design provisions of the Canadian masonry design standard CSA S304. Results of previous experimental studies also indicate that even for squat shear walls that experience flexural yielding, lateral displacements are the result of both flexural and sliding shear behaviour. Currently, there is a limited understanding of the sliding shear failure mechanism, magnitude of sliding displacements, and their impact on the overall building response. This paper presents the results of a comprehensive research study on the sliding shear mechanism and a novel approach for estimating sliding displacements. Three distinct mechanisms for Reinforced Masonry (RM) walls with sliding displacements have been identified in the study: sliding shear (SS) mechanism, dowel-constrained failure (DCF) mechanism, and combined flexural-sliding shear (CFSS)...
Santa Fe, NMDisclaimers: The opinions presented are the private views of the speaker, and should ... more Santa Fe, NMDisclaimers: The opinions presented are the private views of the speaker, and should not be construed as official or representing the views of the Department of Army, the
Seismic design provisions in the Canadian Masonry Code often lead to indications that the governi... more Seismic design provisions in the Canadian Masonry Code often lead to indications that the governing yield mechanism for a reinforced masonry wall with a height/length (H/L) ratio below 1.0 and under low axial loads will not achieve the design objective of a flexural yield mechanism and instead, will develop a sliding shear mechanism. In addition to this, results of previous experimental research studies indicate that even for squat walls that yield in flexure, the displacements at the top are the result of both flexure and sliding shear mechanisms. Currently, there is a limited understanding on how sliding shear displacements develop and how they affect the response of a building. The following work sets out to study the sliding shear mechanism and to develop tools for determining the corresponding displacements for seismic design. This study proposes to modify the current definition for a sliding shear mechanism, re-classifying yield mechanisms of Reinforced Masonry (RM) walls with...
A large number of existing buildings, particularly those constructed prior to the enforcement of ... more A large number of existing buildings, particularly those constructed prior to the enforcement of ductile design philosophy of 1970’s, were primarily designed and detailed to resist gravity loads. Structures of this type do not have the current reinforcement detailing required by modern codes in high and medium seismic zones and, hence, they are considered potential life–safety hazards. In addition, the presence of masonry infill walls was often ignored by engineers since they are normally considered as architectural elements. However, lessons learned from past earthquakes and from several tests performed have shown that those walls tend to interact with the bounding frame when the structural system is subjected to moderate or severe earthquake ground motions and that such interaction may or may not be beneficial to the performance of the structure. This paper presents the first part of an experimental testing program carried out at the University of British Columbia (UBC) in Vancouv...
Humans are constantly exposed to hazardous pollutants in the environment—for example, in the air,... more Humans are constantly exposed to hazardous pollutants in the environment—for example, in the air, water, soil, rocks, diet, or workplace. Trace metals are important in environmental pathology because of the wide range of toxic reactions and their potential adverse effects on the physiological function of organ systems. Exposures to toxic trace metals have been the subject of numerous environmental and geochemical investigations, and many studies have been published on the acute and/or chronic effects of high-level exposures to these types of agents; however, much fewer data are available concerning the health effects of low-dose chronic exposure to many trace metals. Chronic low-dose exposures to toxic elements such as cadmium and arsenic have been shown to cause these metals to accumulate in tissues over time, leading to multiple adverse effects in exposed individuals. Exposure to toxic trace metals occurs via three principal routes: percutaneous absorption, ingestion, or inhalatio...
Revista Mexicana de Ciencias Agrícolas, 2018
El propósito de este trabajo realizado en 2009, fue estudiar el efecto de la temperatura, y la h... more El propósito de este trabajo realizado en 2009, fue estudiar el efecto de la temperatura, y la humedad relativa, en la germinación de esporangios de Bremia lactucae Regel. El efecto de estas variables sobre la germinación de esporangios in vitro, se evaluó en cámaras de incubación mediante 21 tratamientos formados por los niveles de temperatura de 5, 10, 15, 20, 25, 30, 35 oC en combinación con humedades de 70, 80, 90%. La germinación se evaluó a las 24 h de establecer el tratamiento. Se realizó un análisis estadístico para determinar la importancia de estas variables y su interacción sobre la germinación de esporangios e inferir sobre el rango óptimo de temperatura y humedad. Se encontró que existe efecto significativo de la interacción entre estas variables sobre la germinación, presentándose esta desde los 5 oC hasta los 25 oC. El tratamiento que presentó el mayor porcentaje de germinación fue el de 10 oC en combinación con humedad relativa 90%. Con base en ...
Bulletin of the New Zealand Society for Earthquake Engineering, 2011
As part of the ‘Project Masonry’ Recovery Project funded by the New Zealand Natural Hazards Resea... more As part of the ‘Project Masonry’ Recovery Project funded by the New Zealand Natural Hazards Research Platform, commencing in March 2011, an international team of researchers was deployed to document and interpret the observed earthquake damage to masonry buildings and to churches as a result of the 22nd February 2011 Christchurch earthquake. The study focused on investigating commonly encountered failure patterns and collapse mechanisms. A brief summary of activities undertaken is presented, detailing the observations that were made on the performance of and the deficiencies that contributed to the damage to approximately 650 inspected unreinforced clay brick masonry (URM) buildings, to 90 unreinforced stone masonry buildings, to 342 reinforced concrete masonry (RCM) buildings, to 112 churches in the Canterbury region, and to just under 1100 residential dwellings having external masonry veneer cladding. In addition, details are provided of retrofit techniques that were implemented w...
En 1806, tras fracasar su intento de invasión de Gran Bretaña, Napoleón decreta el Bloqueo Contin... more En 1806, tras fracasar su intento de invasión de Gran Bretaña, Napoleón decreta el Bloqueo Continental, que prohibía el comercio de productos británicos en el continente europeo. Portugal, tradicional aliada de Inglaterra, se niega a acatarlo y Napoleón decide su invasión. Para ello necesita transportar allí sus tropas terrestres. El 27 de octubre de 1807, Manuel Godoy, valido de Carlos IV, representado por su plenipotenciario, el Consejero de Estado y Guerra Eugenio Izquierdo, firma con Gérard Duroc, representante de Napoleón, el Tratado de Fontainebleau, en el que se estipula la invasión militar conjunta franco-española de Portugal, para lo que se permite el paso de tropas francesas por territorio español.
Open-File Report, 2000
This report summarizes results of a visit by the report authors to Marinduque Island, Philippines... more This report summarizes results of a visit by the report authors to Marinduque Island, Philippines, in May 2000. The purpose of the visit was to conduct a preliminary examination of environmental problems created by a 1996 tailings spill from the Marcopper open-pit copper mine. The mine was operated from 1969-1996 by Marcopper Mining Corporation, under 39.9% ownership, and design and management control, of Placer Dome, Inc. Our trip expenses to and from the Philippines were funded by the USGS. In-country expenses were paid by the offices of Congressman Reyes and the Governor of Marinduque, Carmencita O. Reyes. This report includes observations we made based on our relatively short visit to the island, and observations based upon a preliminary review of the literature available on the island's miningenvironmental issues. In addition, we have included preliminary interpretations and analytical results of some water, sediment, and mine waste samples collected during our trip. We also highlight the environmental and human health issues we feel are in need of further study and consideration for mitigation or remediation. This report is preliminary and is not intended to be a comprehensive or final review of the island's mining-environmental issues; many areas of further study are clearly needed. Mining-related environmental problems have greatly affected several areas on Marinduque. Most of the observed problems stem from largescale open pit copper mining at Marcopper, and primarily affect: " The Mogpog and Boac River systems, which Boac River tailings The main priority of our visit was to get an overview of the 1996 Boac River tailings spill, and the proposed options to remediate the spill. From information gathered on our trip, a limited review we have made of reports on the tailings, and the results of simple leach experiments we performed to examine metal mobility from the
Biological Trace Element Research, 2005
A noninvasive isotopic approach to estimate the bone lead contribution to blood in children: impl... more A noninvasive isotopic approach to estimate the bone lead contribution to blood in children: implications for assessing the efficacy of lead abatement 2 Human respiratory uptake of chloroform and haloketones during showering 2 A quantitative look at fluorosis, fluoride exposure, and intake in children using a health risk assessment approach 3 Decreasing trend in renal disease mortality after cessation from arsenic exposure in a previous arseniasis-endemic area in southwestern Taiwan 3 Fetal exposure to PCBs and their hydroxylated metabolites in a Dutch cohort 4 Pilot study on the naphthalene exposure of German adults and children by means of urinary 1-and 2-naphthol levels 4 Environmental contamination of mercury in the Philippines: its impact on the health and the environment 5 Exposure to environmental mercury in the Rwamagasa artisanal gold mining area, Geita District, Tanzania 5 Health and environmental impact of mercury in a gold mining community in Western Mindanao, Philippines 5 Human and environmental impacts from French chlor-alkali plants emission of mercury 6 Indian chlor-alkali industries: source of environmental health hazards and transboundary transport 6 Decreasing prevalence of pleural calcifications among Metsovites with nonoccupational asbestos exposure 7
Abstract : In response to Congressional concerns that occupational lung disease may have been mis... more Abstract : In response to Congressional concerns that occupational lung disease may have been misdiagnosed among Navy Personnel exposed to dusts aboard ship, the Navy Bureau of Medicine and Surgery established the Navy Lung Disease Assessment Program and designated the Naval Health Research Center (NHRC) as the Program Manager. NHRC established an External Scientific Advisory Committee to help design a research project to address the question of lung disease misdiagnosis. A public policy advisory Committee was also established to answer public concerns. With concurrence of these 2 committees, research objectives were defined and two primary approaches were developed to examine the potential for lung disease misdiagnosis.
Revista de Logopedia, Foniatría y Audiología, 2009
Bilingualism and multilingualism are a common occurrence in today's world. Many bilingual... more Bilingualism and multilingualism are a common occurrence in today's world. Many bilinguals (speakers of two languages) and multilinguals or polyglots (speakers of more than two languages) in multilingual population centers receive speech therapy for acquired language problems or aphasia as a result of neurological damage. Serving these bilingual and multilingual aphasic patients involves theoretical and clinical challenges for speech therapists.
Encuentro Profesores Universitarios De Contabilidad Iv Encuentro De Profesores Universitarios De Contabilidad Comunicaciones Vol 2 1991 Pags 1323 1342, 1991
Estudios Financieros Revista De Contabilidad Y Tributacion Comentarios Casos Practicos, 1992
Alimentaria Revista De Tecnologia E Higiene De Los Alimentos, 1999
Micrococci are a microbial group ubicuos in the secondary flore of the main varieties of cheese, ... more Micrococci are a microbial group ubicuos in the secondary flore of the main varieties of cheese, which can development an important role in the biochemical process during cheese ripening. In the present work, main enzymatic activities of this microorganisms are describes and the results of technological use of this microorganims for the elaboration of different varieties of cheese are reviewed.
Tecnica Contable, 2002
O como ingresos del ejercicio, o a distribuir en varios ejercicios, en el caso de las diferencias... more O como ingresos del ejercicio, o a distribuir en varios ejercicios, en el caso de las diferencias positivas.
Iii Congreso De Economia Regional De Castilla Y Leon Comunicaciones Vol 3 1992 Pags 1497 1510, 1992
Boletin Del Instituto De Estudios Giennenses, 1997
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Papers by jose miguel apaza centeno