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Hernandez A.A.,ISPJAE | Diago L.A.,Tokyo Institute of Technology
IFMBE Proceedings | Year: 2013

A variety of behaviors have no clear explanation in biological sciences, an example is the interactions between immune system cells. The simulation of mathematical models has allowed explaining the function of many of these complex systems and understanding the results of experimental measurements. These models have been refined at the same time that can be obtained new data of measurements in vivo or in vitro experiments to get new modeling paradigms such as agent-based modeling. This article presents the software TissueSim that allows the simulation of interactions between populations of T cells, Antigen Presenting Cells (APC) and chemicals. This software implements the Cellular Potts Model (CPM) which is an extension of the Potts model applied to cells and has been widely used since its creation. TissueSim can be used to simulate the interactions of immune cell populations because it reproduces results such as "cell adhesion explains the formation of cellular patterns" and "movement of T cells in a lymph node" from data reported in the literature. © 2013 Springer.

The chemical stabilization is one of the techniques that are used for the improvement of soils, using chemical substances that modify its characteristics. In Cuba an investigation is developed that leaves of the creation of a procedure of stabilization of soils using quaternary salts of ammonium, that It knows as ROCAMIX, that has as main advantages its economy and simplicity in its employment, besides getting the resistance increment and permeability reduction in the soils. In the article it shows up the way in that the quaternary salts produce the changes in the soils, as well as the modifications of the physical and mechanical properties of two types of stabilized soils with this system, comparing the properties of the soil in their natural state and after having improved, as well as the influence of the compaction energy and the evolution of the characteristics of the stabilized soils in the time.

Vilalta G.,CARTIF Centro tecnologico | Nieto F.,CARTIF Centro tecnologico | Vaquero C.,University of Valladolid | Vilalta J.A.,ISPJAE
World Academy of Science, Engineering and Technology | Year: 2010

Abdominal aortic aneurysms rupture (AAAs) is one of the main causes of death in the world. This is a very complex phenomenon that usually occurs "without previous warning". Currently, criteria to assess the aneurysm rupture risk (peak diameter and growth rate) can not be considered as reliable indicators. In a first approach, the main geometric parameters of aneurysms have been linked into five biomechanical factors. These are combined to obtain a dimensionless rupture risk index, RI(t), which has been validated preliminarily with a clinical case and others from literature. This quantitative indicator is easy to understand, it allows estimating the aneurysms rupture risks and it is expected to be able to identify the one in aneurysm whose peak diameter is less than the threshold value. Based on initial results, a broader study has begun with twelve patients from the Clinic Hospital of Valladolid-Spain, which are submitted to periodic follow-up examinations.

Wong O.B.,ISPJAE | Mesa M.I.,ISPJAE | Morlan C.B.B.,ISPJAE
IFMBE Proceedings | Year: 2013

The identification of highly complex dynamic systems, an important subject of the current scientific research, is addressed in this work. The artificial neural networks were used as a strategy to estimate unknown parameters in a protein chromatographic model, a complex and nonlinear process. The neural structure designed is based into the radial basis function as from experimental data. A tool for estimating the parameters was implemented. To this end, a visual application allowing a friendly environment which can be easily used by the user in obtaining the results was developed. © 2013 Springer.

Zottola D.A.,ISPJAE | Hernandez A.A.,ISPJAE | Serra R.,ISPJAE
IFMBE Proceedings | Year: 2013

This article discusses the application of a technique for developing two-color anaglyph as medium of instruction in biomedical engineering. The article documents the process of obtaining anaglyph. The total development of the research was in the ISPJAE, leaving the first records of anaglyphs made in Cuba. Software was developed in Matlab for obtaining anaglyphs easily and economically. Were presented some of the applications, with emphasis on subjects such as anatomy, due to the need to develop teaching tools to facilitate the understanding of students. The software allows the creation of anaglyphs as teaching in the career of Biomedical Engineering and demonstrates the ability of Matlab to perform anaglyphs. © 2013 Springer.

Garcia J.A.,University of Cantabria | Cabria L.,University of Cantabria | Marante R.,University of Cantabria | Rizo L.,ISPJAE | Mediavilla A.,University of Cantabria
Progress in Electromagnetics Research | Year: 2010

A zero-bias dual-mode mixing antenna for wireless transponders is proposed in this paper. Designed over an Enhancement-mode Pseudomorphic HEMT (E-PHEMT), the mixer takes advantage of the device nonlinear characteristics around cold operation. Simple closed form expressions, obtained from time-varying circuit analysis, predict good conversion efficiency in two different operating modes without requiring DC bias. For validation, a lab prototype has been implemented and tested, to be finally integrated in a compact active printed antenna suitable for wireless sensor networks or other radio frequency identification (RFID) applications.

Cepero Diaz A.O.,ISPJAE | Gonzalez Santos A.I.,ISPJAE
IEEE Latin America Transactions | Year: 2016

The measure of the instant angular position of the rotor is integral part of the control of Switching Reluctance Motor drivers. The direct measurement of this variable adds complexity and cost to the system and it doesn't give good results sometimes. This has motivated the development of estimators for the rotor angular position of the SRM. In this paper are presented a Moving Horizon Estimator and an Unscented Kalman Filter for estimating the speed and rotor angular position of the SRM MFR 132.5. Both estimators are based on a grey box model of the motor, also presented in this paper. It was carried out the simulation on PC of the designed estimators for estimating the speed and the angular position of the rotor under different motor operation conditions and considering an error in the initial estimation of the angular position and noisy measurements. © 2003-2012 IEEE.

Torres A.E.,ISPJAE | Marante F.,ISPJAE | Tazon A.,University of Cantabria | Vassal'Lo J.,Antenna Technology Group
AEU - International Journal of Electronics and Communications | Year: 2015

We present a novel feeding system for microstrip radiators which is based on electromagnetic coupling. The effects of the antenna's key design parameters have been studied and discussed. This new feeding system was found to be very simple and useful in the design of flat arrays and reflectarrays using microstrip patches. A novel circularly polarized patch radiator fed from only one input line and based on the proposed feeding system is also presented in this paper. The result of the developed prototype in axial ratio bandwidth is double that obtained with a typical microstrip patch fed from two inputs. © 2015 Elsevier GmbH. All rights reserved.

Arias-Laso S.,ISPJAE | Diago-Cisneros L.,University of Habana
Physica E: Low-Dimensional Systems and Nanostructures | Year: 2012

Events of giant conductance and anomalies of the phase transmission time for holes are theoretically investigated within the multicomponent scattering approach. Based on this model, new analytical expressions for unitarity relations in the uncoupled hole transport are obtained and directly applied to study the behavior of the conductance and the phase transmission time in a double barrier resonant tunneling (DBRT) and a superlattice GaAs-cladding layer/(AlAs/GaAs) n/GaAs-cladding layer. Clear-signature evidences of giant conductance phenomena for hole transmission without valence-band mixing through a DBRT and a superlattice were found. The giant conductance effect losses robustness by manipulating the number of superlattice layers and by including the valence-band particles coupling as well. Phase time through the heterostructure exhibits extremal dependencies in the gaps and in the barriers, as those reported before for electrons. We have detected an earlier arrival phase time for the propagation of both flavors of holes within the barrier, in the order of few tenths of picoseconds. An appealing filter-like effect is presented, whenever a selective confinement strength arises independently for both flavors of holes in the uncoupled regime. Our results also prescribe noticeable evidences for both uncoupled and coupled hole fluxes, similar to those foretold by Hartman, upon transmission of electrons through opaque barriers. © 2011 Elsevier B.V.

The National Institute of Savings and Housing (INAV) was created in 1959 in Havana and operated until 1962. The constructive work done by this agency marked a turning point within the context of housing policies in Cuba and sparked a boom in the construction of large-scale social housing estates. From that moment on, Cuba was at the same level as its regional counterparts thanks to the development of a massive and comprehensive plan. This paper offers the results of research of a historical nature based on the collection of primary data, fieldwork and narratives obtained through interviews with the founders and first beneficiaries of this program. This allowed us to gather, classify and characterize the work done by the INAV in Havana. © 2015, Instituto de la Vivienda. All rights reserved.

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