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Luevanos Rojas A.,Universidad Juarez del Estado de Durango
ICIC Express Letters, Part B: Applications | Year: 2013

In the design of reinforced concrete rectangular footings subjected to axial load and flexure in two directions, there are different pressures in each corner, and these are exercised for the floor. In this paper, a mathematical model is developed to take into account the real pressure of ground acting on the contact surface of the rectangular footing when applying the load that must support said structural member. The classical model takes into account only the maximum pressure of the ground for design of footings and it is considered uniform at all points of contact area of footing, i.e., all the contact surface has the same pressure. Also a comparison is developed between the two models as shown in the results tables. According to the data obtained, it shows that the classical model is larger than the model proposed. Therefore, normal practice to use the classic model will not be a recommended solution. Then the proposed model is the most appropriate, since it is more economic and also is adjusted to real conditions. © 2013. Source


Luevanos Rojas A.,Universidad Juarez del Estado de Durango
ICIC Express Letters, Part B: Applications | Year: 2013

In this paper a mathematical model is developed to obtain the most economical dimension of the contact surface in rectangular footings, when applying the load that must support said structural member. The classical model is developed by trial and error, i.e., it is proposed a dimension, and using the expression of the bidirectional flexure to obtain the stresses acting on the four corners of the rectangular footing, which must meet the following conditions. 1) The minimum stress should be equal to or greater than zero, because the soil is not capable of withstanding tensile stresses. 2) The maximum stress must be equal or less than the allowable capacity that can be capable of withstanding the soil. Therefore, normal practice to use the classic model will not be a recommended solution. Then, it is best to use the proposed model since it is more economic. © 2013 ICIC International. Source


Cuellar-Cruz M.,Research Center and Asistencia en Tecnologia | Lopez-Romero E.,University of Guanajuato | Villagomez-Castro J.C.,University of Guanajuato | Ruiz-Baca E.,Universidad Juarez del Estado de Durango
Future Microbiology | Year: 2012

Biofilms of Candida albicans, Candida parapsilosis, Candida glabrata and Candida tropicalis are associated with high indices of hospital morbidity and mortality. Major factors involved in the formation and growth of Candida biofilms are the chemical composition of the medical implant and the cell wall adhesins responsible for mediating Candida-Candida, Candida-human host cell and Candida-medical device adhesion. Strategies for elucidating the mechanisms that regulate the formation of Candida biofilms combine tools from biology, chemistry, nanoscience, material science and physics. This review proposes the use of new technologies, such as synchrotron radiation, to study the mechanisms of biofilm formation. In the future, this information is expected to facilitate the design of new materials and antifungal compounds that can eradicate nosocomial Candida infections due to biofilm formation on medical implants. This will reduce dissemination of candidiasis and hopefully improve the quality of life of patients. © 2012 Future Medicine Ltd. Source


Rojas A.L.,Universidad Juarez del Estado de Durango
International Journal of Innovative Computing, Information and Control | Year: 2012

This paper proposes a method for analysis of statically indeterminate beams, considering the shear deformations, which is an extension to the slope-deflection method, which is used to analyze all kinds of continuous beams. This methodology considers the shear deformation and flexure. The traditional method takes into account only the flexure deformation and without taking into account the shear deformation; this is how it usually develops structural analysis of statically indeterminate beams. Also, it makes a comparison between the proposed method and the traditional method, and the differences between both methods are greater, especially members of short length as can be seen in the results tables of the problems considered, in the traditional method not all values are on the side of safety. Therefore, the usual practice, without considering the shear deformations in short clear between its supports, will not be a recommended solution and it is proposed the use of considering shear deformations and also is more attached to reality. © 2012 ICIC International. Source


Vazquez B.Y.,Universidad Juarez del Estado de Durango
Journal of biomedical optics | Year: 2010

Functional microscopic imaging of in vivo tissues aims at characterizing parameters at the level of the unitary cellular components under normal conditions, in the presence of blood flow, to understand and monitor phenomena that lead to maintaining homeostatic balance. Of principal interest are the setting of shear stress on the endothelium; formation of the plasma layer, where the balance between nitric oxide production and scavenging is established; and formation of the oxygen gradients that determine the distribution of oxygen from blood into the tissue. Optical techniques that enable the analysis of functional microvascular processes are the measurement of blood vessel dimensions by image shearing, the photometric analysis of the extent of the plasma layer, the dual-slit methodology for measuring blood flow velocity, and the direct measurement of oxygen concentration in blood and tissue. Each of these technologies includes the development of paired, related mathematical approaches that enable characterizing the transport properties of the blood tissue system. While the technology has been successful in analyzing the living tissue in experimental conditions, deployment to clinical settings remains an elusive goal, due to the difficulty of obtaining optical access to the depth of the tissue. Source

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