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Playa del Carmen, Mexico

Chavez-Ramirez A.U.,CIDETEQ | Vallejo-Becerra V.,Centro Universitario Cerro Of Las Campanas | Cruz J.C.,Technological Institute of Chetumal | Ornelas R.,Tozzi Renewable Energy SpA | And 3 more authors.
International Journal of Hydrogen Energy | Year: 2013

World fossil fuel reserve is expected to be exhausted in coming few decades. Therefore, the decentralization of energy production requires the design and integration of different energy sources and conversion technologies to meet the power demand for single remote housing applications in a sustainable way under various weather conditions. This work focuses on the integration of photovoltaic (PV) system, micro-wind turbine (WT), Polymeric Exchange Membrane Fuel Cell (PEM-FC) stack and PEM water electrolyzer (PEM-WE), for a sustained power generation system (2.5 kW). The main contribution of this work is the hybridization of alternate energy sources with the hydrogen conversion systems using mid-term and short-term storage models based in artificial intelligence techniques built from experimental data (measurements obtained from the site of interest), this models allow to obtain better accuracy in performance prediction (PVMSE = 8.4%, PEM-FCMSE = 2.4%, PEM-WEMSE = 1.96%, GSRMSE = 7.9%, WTMSE = 14%) with a practical design and dynamic under intelligent control strategies to build an autonomous system. Copyright © 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. Source

Conde-Vela V.M.,Technological Institute of Chetumal | Conde-Vela V.M.,Colegio de Mexico
Zootaxa | Year: 2013

The nereidid polychaete genus Namalycastis Hartman, 1959 has been recorded almost exclusively in non-marine environments. This genus includes species having four pairs of tentacular cirri, and its species mainly differ by the relative size of dorsal cirri in posterior chaetigers. Namalycastis occulta n. sp. is described based upon non-mature and mature specimens collected in the intertidal from Chetumal Bay, Quintana Roo, Mexico. Its distinctive features are the lack of notopodial spinigers, eyes, and teeth in the mandibles. Namalycastis borealis Glasby was found in Tamalcab Island, Chetumal Bay and it is the first record for Mexico. Analyses of the intraspecific variability, a key to the known species in the Grand Caribbean region, and commentaries about some taxonomic topics are also included. Copyright © 2013 Magnolia Press. Source

Chavez-Ramirez A.U.,CIDETEQ | Cruz J.C.,CIDETEQ | Cruz J.C.,Technological Institute of Chetumal | Espinosa-Lumbreras R.,Autonomous University of Zacatecas | And 3 more authors.
International Journal of Hydrogen Energy | Year: 2013

The Mexican territory has a large potential for renewable energy development, such as geothermal, hydro, biofuels, wind and solar. Thus, a 2.5 kW hybrid power system (solar, wind and hydrogen) was designed and installed to meet the power demand for a stand-alone application at the University of Zacatecas. The hybrid unit integrates three power energy sources -a photovoltaic system (PV), a micro-wind turbine (WT), a prototype of a unitized regenerative fuel cell (URFC) and energy storage devices (batteries)- in addition to their interaction methodology. The main contribution of this work is the URFC integration to a hybrid power system for the production of H2 (water electrolyzer mode) and energy (fuel cell mode). These three energy technologies were connected in parallel, synchronized to the energy storage system and finally coupled to a power conversion module. To achieve the best performance and energy management, an energy management and control strategy was developed to the properly operation of the power plant. A meteorological station that has wireless sensors for the temperature, the humidity, the solar radiation and the wind speed provides the necessary information (in real time) to the monitor and control software, which computes and executes the short and mid-term decisions about the energy management and the data storage for future analysis. Copyright © 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. Source

Balan-Dzul V.,Technological Institute of Chetumal | de Jesus-Navarrete A.,Colegio de Mexico
Revista de Biologia Marina y Oceanografia | Year: 2011

The milk conch Strombus costatus has rarely been studied at population and fisheries level in the Caribbean and Gulf of Mexico. To determine density and population structure of S. costatus at Banco Chinchorro, samplings was conducted using the method of distance during two seasons: summer (October 2008 and July 2009) and winter (November 2008 and February 2009), in order to evaluate the degree of aggregation we use the ratio variance/mean. With the size frequencies, growth parameters were obtained using FISAT II. 157 conchs were recorded, which showed an aggregate distribution. The highest density occurred in the winter season; 172 ind há-1 in the southern zone in November 2008, whereas in the central zone density was 77 ind há-1 in February 2009 and finally 51 ind há-1 in the northern zone in February 2009. The size structure varied between 80-165 mm siphonal length. The highest relative frequency value (FR) was detected in the south ranging between 111-115 mm LS. The infinite maximum length was L∞ = 193.5, and a growth constant K = 0.38 with t0 = -0.51 was calculated. The rate of natural mortality was M = 1.062. The reported densities are higher than those reported in other Caribbean areas; however, the population of S. costatus could not support commercial exploitation at Banco Chinchorro. Densities of S. costatus have not changed over time, so milk conch is not displacing queen conch, which is subject to fisheries. Source

Barbosa R.,University of Quintana Roo | Sanchez V.M.,University of Quintana Roo | Escobar B.,Research Center Cientifica Of Yucatan | Cruz J.C.,Technological Institute of Chetumal | Toral-Cruz H.,University of Quintana Roo
International Journal of Hydrogen Energy | Year: 2015

Nowadays, society and the economy largely depend on wireless communications because they allow freedom of human activities from spatial and temporal restrictions. To add mobility to this communication technology type, portable communication networks can be implemented to achieve this aim as well as to provide ubiquitous coverage in emergency circumstances. In accordance with the above-mentioned points, we study a photovoltaic-hydrogen system (PVS-H2) for a portable emergency communication system (PECS), which operates in a mobile ad-hoc mesh network. As a case study, a theoretical application on the effects of two hurricanes per year in Cancun, Mexico using real weather data and random dates is presented. A power system was sized to cope with hypothetical emergency communication scenarios. The results show that the PVS-H2 can operate during two hurricanes with an efficacy of 79.14% and a standard deviation of 0.96%. According to the results, the analysis strategy can determine the best configuration to avoid oversizing or undersizing with a small standard deviation. The obtained sizing result ensures that the PVS-H2 supplies adequate energy for the PECS. © 2015 Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. Source

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