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Search Results: 1 - 10 of 169055 matches for " Nora E. Munguia "
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Masculinities of Gym Users in the Context of Sustainable Development  [PDF]
Rafael Perez-Rios, Yerson J. Beltran, Javier Esquer, David S. Zepeda, Nora E. Munguia, Luis E. Velazquez
Psychology (PSYCH) , 2018, DOI: 10.4236/psych.2018.92019
Abstract: The relationship between conceptions of masculinity and sport injuries is presented in this paper describing how male gym users, including bodybuilders and fitness practitioners, have shown risk behaviors that are typical of their gender. A qualitative and quantitative study was applied as a part of the methodology at a gym in the city of Hermosillo, Mexico, focusing on injury risks related to masculinity and their prevention. Questionnaire of injuries disposition and in-depth interviews were applied to gym users. Most of the surveyed users showed knowledge of the proper use of gym equipment and stretching and warming techniques as well as the support of the gym instructors. The main cause of injuries is related to behaviors, since they chose not to ask for instructions to show power and strength to others as a result of the male competitive tension that exists among them due to conceptions of masculinity. It is concluded that, in fact, there is a relationship between conceptions of masculinity and sport injuries. Users report the existence of social tension and that for the sole reason of being male they feel the responsibility and obligation of being the best without taking any prevention or safety measure.
Environmental Approach for Energy Audits on Government Buildings: A Mexican Case for the Air Conditioning System  [PDF]
Luis E. Velazquez, Rafael Perez-Rios, Nora E. Munguia, David S. Zepeda, Carla Neudert, Javier Esquer
Journal of Environmental Protection (JEP) , 2018, DOI: 10.4236/jep.2018.93019
Abstract: In the face of the climate change, energy consumption is one of the main issues to be solved. Energy audits are useful tools that may contribute to develop energy efficiency initiatives. The purpose of this paper is to provide insights into how energy audits, with a scope on air conditioning (AC) systems, contribute to develop energy efficiency options for a government building in the city of Hermosillo, Mexico. The methodology is based in the energy audit framework proposed by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). Results show that, in a typical day of maximum consumption, AC represents 64% of the total electrical consumption, while office equipment accounted for 22%, and lighting 14%. Additionally, AC system has a yearly consumption of 54,419.40 kWh with an emission estimate of 24.92 tons of CO2-eq/year. Three approaches for energy efficiency proposals were addressed through AC systems: Improvement of the operation and consumption habits, maintenance and reconditioning of facilities, and replacement of AC units. While Mexico has international commitments through environmental treaties related to contribute to climate change mitigation, this study shows that, at least one government building still produces potential impacts that can be deterred by addressing structural and behavioral changes related to AC operation. Finally, this study may be used as reference for energy efficiency practitioners or decision-making authorities in the public administration field for developing better energy policies for government buildings.
The Institutionalization of Life Cycle Assessment in Mexico  [PDF]
Nora Munguia, Clara Rosalia Alvarez, Rafael Perez, Alma Flores, Francisco Martinez, Luis Velazquez
Journal of Environmental Protection (JEP) , 2015, DOI: 10.4236/jep.2015.68073
Abstract: This article presents a study of Life Cycle Assessment (LCA) at a slaughterhouse located in north-western Mexico with the purpose of testing the premise of a low degree of institutionalization of Industrial Ecology in Mexico. The article aims at analyzing the current role played by the Mexican academia in increasing the degree of institutionalization of the concept of LCA in northwestern Mexico. There was conducted a life cycle analysis study according to the standards ISO 14040: 2006, NMX-SAA-14040-IMNC-2008NOM in a Federally Inspected Type (TIF by Spanish acronym) Slaughterhouse in the state of Sonora in Northwest Mexico. The slaughter process was characterized by observing the production tasks during several walkthroughs the production lines and by having short interviews with workers, supervisors, and the manager. The CH4 emissions were calculated using the guidelines suggested by the Intergovernmental Panel on Climate Change (IPCC 2006). The present LCA case study revealed opportunities for improving the environmental performance of the slaughterhouse by taking measures such as the reduction of CH4 from enteric fermentation since methane was one of the main greenhouse gases responsible for climate change. Although, the LCA generated reliable information in terms of climate change or water eutrophication, the chances of implementing sustainable initiatives were unlikely because the benefits to reduce the impacts to climate change or to reduce the water crisis would be unnoticeable and unaffordable for companies. Findings in this study also confirmed the importance of Mexican universities for promoting and conducting more LCA studies among private and public organizations in order to guide firms towards this tool. The case study here presented gives insights to LCA stakeholders in Mexico to implement or improve the effectiveness of their potential LCA initiatives through the identification of strategies, opportunities, and barriers.
Energy Audit in the Meat Processing Industry—A Case Study in Hermosillo,Sonora Mexico  [PDF]
Nora Munguia, Luis Velazquez, Tania Poom Bustamante, Rafael Perez, Johannes Winter, Markus Will, Bernd Delakowitz
Journal of Environmental Protection (JEP) , 2016, DOI: 10.4236/jep.2016.71002
Abstract: The meat processing industry, due to its high energy consumption, needs to be assessed in an energy usage basis. This paper reports the results and implications of an energy audit in a meat processing industry. In addition, this work provides a comprehensive and practical approach to energy saving measures in the assessed company to recognize factors that can determine a possible transition to sustainable patterns of electricity consumption. The paper described the application to energy auditing, developed by AFNOR (2014) for efficient energy management along with ISO 50001 (energy management systems). For a more specific energy auditing the guide described by Dall “O” (2013) was used. In this case, a study of an integrative characterization of the company’s energy consumption is made. The research has been divided in two main sections: the first includes an analysis about the characterization of the energy consumption within a meat processing company in the three sustainable approaches such as economical, societal and mainly environmental implications; second, a proposal for strategic energy management measures focusing on high consumer types of facilities. The results obtained allow the identification of main processes with significant correlations in terms of energy consumption within the company. This data has the potential for energy savings. The data acquisition process prompts the development of practical and accessible energy efficiency measures. In addition, a benchmarking analysis with several tools is performed. Altogether, this work gives guidance on the implementation of energy auditing in industries within its geographical and industrial sector limitations.
Sustainability Assessment of Alternatives for Heat Generation and Transfer in Saunas  [PDF]
Nora Munguia, Luis Velazquez, Rafael Perez, Daniel Rincón, Martha Marin, Biagio F. Giannetti, Cecília M. V. B. Almeida, Feni Agostinho
Journal of Environmental Protection (JEP) , 2015, DOI: 10.4236/jep.2015.612120
Abstract: In the search for renewable energy sources, solar energy appears, among others, as a powerful alternative; mainly for those countries located at Earth’s equatorial region. This is the case of a Fresnel device that uses solar radiation to warm-up the air; for instance, within saunas. Authors coined the term sustainable technological innovation to refer to a technological innovation in accordance to the principles of sustainability. The object of this research was comparing the sustainability of a Fresnel Lens Solar Concentration (FLSC) against the sustainability of other twelve alternatives to generate heat. This article assesses the sustainability of fourteen technological options for heat generation and transfer to saunas in the northwest region of Mexico where temperatures often reach above 45 C and where there is a greater potential for exploiting solar energy. Emergy accounting, economic analysis, and global warming potential are the three indicators considered in quantifying sustainability. Results show that infrared ceramic photovoltaic, infrared carbon photovoltaic and infrared metal photovoltaic are the most sustainable systems. The Fresnel device reached the fourth and tenth position, using electricity from photovoltaic and from grid respectively, among all fourteen assessed devices, respectively. Although Fresnel equipment does not release any global warming gases into the atmosphere, or even it demands low amount of non-renewable resources, 1.40 and 4.47 E17 seJF/yr. it requires high economic investment, 20,800 and 79,600 USD/yr, for the implementation and operation phases, which decrease its sustainability performance compared to twelve other evaluated devices.
A combined Majumdar-Papapetrou-Bonnor field as extreme limit of the double-Reissner-Nordstrom solution
I. Cabrera-Munguia,V. S. Manko,E. Ruiz
Physics , 2009, DOI: 10.1007/s10714-011-1142-5
Abstract: The general extreme limit of the double-Reissner-Nordstrom solution is worked out in explicit analytical form involving prolate spheroidal coordinates. We name it the combined Majumdar-Papapetrou-Bonnor field to underline the fact that it contains as particular cases the two-body specialization of the well-known Majumdar-Papapetrou solution and Bonnor's three-parameter electrostatic field. To the latter we give a precise physical interpretation as describing a pair of non-rotating extremal black holes with unequal masses and unequal opposite charges kept apart by a strut, the absolute values of charges exceeding the respective (positive) values of masses.
Remarks on the mass-angular momentum relations for two extreme Kerr sources in equilibrium
I. Cabrera-Munguia,V. S. Manko,E. Ruiz
Physics , 2010, DOI: 10.1103/PhysRevD.83.129902
Abstract: The general analysis of the relations between masses and angular momenta in the configurations composed of two balancing extremal Kerr particles is made on the basis of two exact solutions arising as extreme limits of the well-known double-Kerr spacetime. We show that the inequality M^2 >= |J| characteristic of an isolated Kerr black hole is verified by all the extremal components of the Tomimatsu and Dietz-Hoenselaers solutions. At the same time, the inequality can be violated by the total masses and total angular momenta of these binary systems, and we identify all the cases when such violation occurs.
El Ni o-Southern Oscillation and precipitation history in Baja California: reconstruction using tree ring records
Nora E. Martijena
Geofísica internacional , 2003,
Abstract: Tree ring records from northern Baja California were used for reconstructing annual series of precipitation and El Ni o-Southern Oscillation. Reconstructions were compared to instrumental and historical records for verification. Five tree ring width chronologies were developed using standard dendrochronological and statistical techniques: one of Pinus coulteri, two of Pinus quadrifolia and two of Pinus jeffreyi. One of the latter updated an existing chronology and doubled its period of calibration with instrumental climatic data. The length of the chronologies was 101 to 551 years. All the chronologies had significant correlations with precipitation records from Ensenada, Baja California and San Diego, California and with an ENSO-related index based on instrumental records. Precipitation explained 8 to 57% of the variation in tree growth. Precipitation records were related to SOI (R2adj: 48 and 16% respectively), but tree ring chronologies captured weaker and more variable signals (R2adj : 3 to 24%). Agreement between historical documentary records and the tree ring reconstructed SOI with the highest predictive ability was 82%. Further research to extend the shorter reconstructed chronologies, which now show the strongest precipitation and ENSO signals, and further study of other sites and species from Baja California, is suggested.
Biserial correlation between vorticity field and precipitation:Rainfall diagnosis and prediction
Nora E. Ruiz
Geofísica internacional , 2002,
Abstract: This work concerns the examination of a methodology of synoptic climatology, the biserial correlation technique, which allows studying the relationship between atmospheric circulation and precipitation. The physical meaning of biserial correlation fields between variables representing synoptic-scale circulation, particularly vorticity fields, and local precipitation is explored. One purpose is to examine this approach used to link the large-scale circulation and the smaller-scale surface environment, which seems to be simple, efficient and easy to interpret. An analysis based on biserial correlation configurations between 500 hPa vorticity and precipitation takes into account anomalous vorticity gradients including curvature and shear effects to describe some mechanisms favoring the occurrence of rainfall. It is shown that anomalies in the curvature of synoptic systems are largely causing precipitation. Daily precipitation at Córdoba, Argentina is used as an example to illustrate the results. The position of the cyclonic and anticyclonic anomaly centers and the position of the jet streams in association with precipitation may be clearly identified. The analysis is made extensive to heavier rainfall.
IL-21 Limits Peripheral Lymphocyte Numbers through T Cell Homeostatic Mechanisms
Shrimati Datta, Nora E. Sarvetnick
PLOS ONE , 2008, DOI: 10.1371/journal.pone.0003118
Abstract: Background IL-21, a member of the common γ-chain utilizing family of cytokines, participates in immune and inflammatory processes. In addition, the cytokine has been linked to autoimmunity in humans and rodents. Methodology/Principal Findings To investigate the mechanism whereby IL-21 affects the immune system, we investigated its role in T cell homeostasis and autoimmunity in both non-autoimmune C57BL/6 and autoimmune NOD mice. Our data indicate that IL-21R knockout C57BL/6 and NOD mice show increased size of their lymphocyte population and decreased homeostatic proliferation. In addition, our experimental results demonstrate that IL-21 inhibits T cell survival. These data suggest that IL-21 acts to limit the size of the T cell pool. Furthermore, our data suggest IL-21 may contribute to the development of autoimmunity. Conclusions/Significance Taken together, our results suggest that IL-21 plays a global role in regulating T cell homeostasis, promoting the continuous adaptation of the T cell lymphoid space.
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