Modeling the kinematics of multi-axial composite laminates as a stacking of 2D TIF plies

Thermoplastic composites are widely considered in structural parts. In this paper attention is paid to sheet forming of continuous fiber laminates. In the case of unidirectional prepregs, the ply constitutive equation is modeled as a transversally isotropic fluid, that must satisfy both the fiber inextensibility as well as the fluid incompressibility. When the stacking sequence involves plies with different orientations the kinematics of each ply during the laminate deformation varies significantly through the composite thickness. In our former works we considered two different approaches when simulating the squeeze flow induced by the laminate compression, the first based on a penalty formulation and the second one based on the use of Lagrange multipliers. In the present work we propose an alternative approach that consists in modeling each ply involved in the laminate as a transversally isotropic fluid – TIF - that becomes 2D as soon as incompressibility constraint and plane stress assumption are taken into account. Thus, composites laminates can be analyzed as a stacking of 2D TIF models that could eventually interact by using adequate friction laws at the inter-ply interfaces.Peer ReviewedPostprint (published version

Low Energy Implications of Minimal Superstring Unification

We study the phenomenological implications of effective supergravities based on string vacua with spontaneously broken N=1 supersymmetry by dilaton and moduli $F$-terms. We further require Minimal String Unification, namely that large string threshold corrections ensure the correct unification of the gauge couplings at the grand unification scale. The whole supersymmetric mass spectrum turns out to be determined in terms of only two independent parameters, the dilaton-moduli mixing angle and the gravitino mass. In particular we discuss the region of the parameter space where at least one superpartner is ``visible" at LEP2. We find that the most likely candidates are the scalar partner of the right-handed electron and the lightest chargino, with interesting correlations between their masses and with the mass of the lightest higgs. We show how discovering SUSY particles at LEP2 might rather sharply discriminate between scenarios with pure dilaton SUSY breaking and mixed dilaton-moduli breaking.Comment: 11 pages, LaTEX, psfig, 8 figure

Sparticle and Higgs masses within minimal string unification

We consider the sparticle and higgs spectroscopy in a class of superstring inspired models in which the string threshold corrections ensure the consistency of the string unification scale with the low energy data. The lightest neutralino is almost a pure bino and it is predicted to be the lightest sparticle (LSP). Requiring that $\Omega_{LSP}\leq 0.9$, we find an upper bound on its mass which, in the case of dilaton supersymmetry breaking, turns out to be 160 GeV. The LEP 1.5 experimental lower bound on the chargino mass, $m_{\chi^{\pm}} > 65$ GeV, implies that the lower bound on the LSP mass is $m_{LSP} > 32 (45)$ GeV, corresponding to $\mu )0$. We also determine the lower and upper bounds on the higgs and other sparticle masses. For instance, the lightest higgs lies between 65 and 115 GeV, while the mass of the lightest charged sparticle satisfies 47 GeV $< m_{\tilde{e}_R} < 325$ GeV. With only the top Yukawa coupling of order unity we find that $1.5 \leq \tan \beta \leq 3.5$.Comment: version to be appeared in Phys. Lett.

Remotely piloted aircraft systems and a wireless sensors network for radiological accidents

In critical radiological situations, the real time information that we could get from the disaster area becomes of great importance. However, communication systems could be affected after a radiological accident. The proposed network in this research consists of distributed sensors in charge of collecting radiological data and ground vehicles that are sent to the nuclear plant at the moment of the accident to sense environmental and radiological information. Afterwards, data would be analyzed in the control center. Collected data by sensors and ground vehicles would be delivered to a control center using Remotely Piloted Aircraft Systems (RPAS) as a message carrier. We analyze the pairwise contacts, as well as visiting times, data collection, capacity of the links, size of the transmission window of the sensors, and so forth. All this calculus was made analytically and compared via network simulations.Peer ReviewedPostprint (published version

Monitoring tomato leaf disease through convolutional neural networks

Agriculture plays an essential role in Mexico’s economy. The agricultural sector has a 2.5% share of Mexico’s gross domestic product. Specifically, tomatoes have become the country’s most exported agricultural product. That is why there is an increasing need to improve crop yields. One of the elements that can considerably affect crop productivity is diseases caused by agents such as bacteria, fungi, and viruses. However, the process of disease identification can be costly and, in many cases, time-consuming. Deep learning techniques have begun to be applied in the process of plant disease identification with promising results. In this paper, we propose a model based on convolutional neural networks to identify and classify tomato leaf diseases using a public dataset and complementing it with other photographs taken in the fields of the country. To avoid overfitting, generative adversarial networks were used to generate samples with the same characteristics as the training data. The results show that the proposed model achieves a high performance in the process of detection and classification of diseases in tomato leaves: the accuracy achieved is greater than 99% in both the training dataset and the test dataset.This work was partially funded by the State Research Agency of Spain under grant number PID2020-116377RB-C21.Peer ReviewedPostprint (published version

’Proyecto de electrificación rural del caserío José Olaya, Distrito de Mache, Provincia de Otuzco, Departamento de La Libertad

Esta tesis se desarrolla con la única finalidad, de suministrar energía eléctrica que es el insumo básico para el desarrollo de los pueblos rurales, y en este caso para el caserío de José Olaya, Distrito de Mache, Provincia de Otuzco, Departamento de La Libertad, para la cual se realizó un correcto diseño de la red primaria y secundaria, con el objetivo de mejorar la calidad de vida de los moradores, sabido es que la energía eléctrica beneficia en la lucha contra la pobreza, en diferentes ámbitos tales como salud, educación y el bienestar de las personas. Para la cual se utilizó las Normas establecidas y pertinentes del Código Nacional de Electricidad Suministro 2011, y las normas de la Dirección General de Electricidad del Ministerio de Energía y Minas, y normas internacionales vigentes que están relacionadas a lo investigado en la tesis. Se diseñó la Red Primaria Bifásica en 22.9 KV, con un recorrido de 591.90m, la Red Secundaria en 440/220 voltios, con un recorrido de 1.708.70 Km, con tres circuitos, las instalaciones del alumbrado público, con lámparas de vapor de sodio, y las 33 conexiones de viviendas domiciliarias y seis cargas especiales, culminando con el metrado y el presupuesto referencial para la ejecución del proyecto. Todo ello implica el desarrollo socio - económico y agroindustrial del caserío José Olaya

Unificación de comunicaciones entre el vehículo y la central empleando el protocolo IPv6

Las arquitecturas de comunicación presentes actualmente en el campo de la gestión de flotas, hacen uso de diversas conexiones para tratar con los diferentes tipos de comunicaciones que se establecen entre los vehículos y la central, ya sea para transmitir voz, datos o para enviar y recibir faxes. En un intento de solucionar esta situación, el proyecto DAMA estudia la mejor manera de centralizar todas estas comunicaciones en un dispositivo de bajo coste, que actúe como único punto de acceso entre el mundo exterior y el vehículo, utilizando en cada momento la mejor red de acceso disponible. La utilización del protocolo IPV6, y más concretamente el servicio de movilidad a nivel de red que éste proporciona (MIPv6), junto con las técnicas de movilidad a nivel de aplicación proporcionadas por el protocolo de señalización SIP, son los pilares básicos en los que se basa la solución propuesta por DAMA

DPU Offloading Programming with the OpenMP API

Data processing units (DPUs) as network co-processors are an emerging trend in our community, with plenty of opportunities yet to be explored. These have been generally used as domain-specific accelerators transparent to application developers; In the HPC field, DPUs have been used as MPI accelerators, but also to offload some tasks from the general-purpose processor. However, the latter required application developers to deploy MPI ranks in the DPUs, as if they were remote (weak) compute nodes, hence considerably hindering programmability. The wide adoption of OpenMP as the threading model in the HPC arena, along with that of GPU accelerators, is making OpenMP offloading to GPUs a wide trend for HPC applications. In this paper we introduce, for the first time in the literature, OpenMP offloading support for network co-processor DPUs. We present our design in LLVM to support OpenMP standard offloading semantics and discuss the programming productivity advantages with respect to the existing MPI-based programming model. We also provide the corresponding performance analysis demonstrating competitive results in comparison with the MPI baseline.The authors would like to express their sincere gratitude to Gilad Shainer, Richard Graham, Gil Bloch, and Yong Qin for their support, insightful comments, and suggestions. The research producing this paper received funding from NVIDIA and the Ministerio de Ciencia e Innovación—Agencia Estatal de Investigación (PCI2021-121958). The authors are grateful for the support from the Department of Research and Universities of the Government of Catalonia to the AccMem (Code: 2021 SGR 00807). Antonio J. Peña was partially supported by the Ramón y Cajal fellowship RYC2020-030054-I funded by MCIN/AEI/10.13039/501100011033 and, by “ESF Investing in your future”Peer ReviewedPostprint (author's final draft

“Dirección y Planificación estratégica de la institución educativa particular General Ollantay, carabayllo 2017”

El objetivo de la presente investigación es determinar la relación entre la Dirección y Planeación estratégica de la Institución Educativa Particular General Ollantay, carabayllo, 2017. La metodología utilizada para la investigación fue diseño no experimental-transversal, de tipo aplicada y de nivel descriptivo correlacional. Para llevar a cabo esta investigación se consideró una población de 60 personas, las cuales laboran en la IEP General Ollantay, de esta población se usó una muestra de 60 personas, la muestra fue seleccionada usando un muestreo probabilístico mediante el método aleatorio simple, quienes respondieron a un cuestionario de 20 preguntas, el cual corresponde al instrumento de recolección de datos. Los resultados obtenidos de las encuestas fueron procesados usando el programa estadístico SPSS v.22, aplicando la estadística descriptiva e inferencial para el análisis de los resultados. Y tuvo como resultado que si existe relación entre las variables estudiadas la Dirección y la Planeación estratégica de la IEP General Ollantay, carabayllo, 2017

Aeropuertos. La razón para su producción en la técnica, los Sujetos técnicos y su actividad

Desde la epistemología de la técnica se realiza una aproximación teórica al Aeropuerto en su condición de lugar desarrollado para acoger tanto aeronaves como labores que hacen parte de la industria del transporte aéreo.&nbsp;Based on the epistemology of the technique, a theoretical approach is made to the Airport in its condition as a developed place to accommodate both aircraft and tasks that are part of the air transport industry.&nbsp;A partir da epistemologia da técnica, é feita uma abordagem teórica do Aeroporto em sua condição de local desenvolvido para acomodar tanto aeronaves quanto tarefas que fazem parte do setor de transporte aéreo.&nbsp