juan valdez - Academia.edu (original) (raw)

Papers by juan valdez

2021 9th International Conference on Control, Mechatronics and Automation (ICCMA)

This article describes the implementation of a hydroponic system prototype using embedded devices... more This article describes the implementation of a hydroponic system prototype using embedded devices based on the Internet of Things (IoT) for real-time monitoring with the integration of Autonomic Computing techniques to trigger the events necessary for self-maintenance, auto-monitoring, self-regulation, and self-repair to provide efficient and optimal use of its resources. By taking control of the hydroponic system through the use of these novel techniques and methodology mentioned in this document, the complete system can be managed as a cyber-physical system that represents outstanding advantages: it reduces human presence for monitoring, control, maintenance, or assistance to incidents. Since it is being monitored remotely, it also provides a large amount of data for analytical purposes such as Artificial Intelligence algorithms, machine learning, deep learning, among others. It is well known that hydroponic systems are experiencing a great demand in recent decades, and this is mainly due to increasing world population, lack of freshwater, climate change, demand for food, etc. Smart hydroponics systems help solve the problem. The main purpose of this article is to give an overview of the benefits of upgrading from traditional agricultural and hydroponic systems to the cyber-physical hydroponic system. Therefore, a prototype has been implemented to demonstrate that the techniques used are feasible and cost-effective.

This work looks at the main themes, concepts and lead figures of the Hellenic philosophical tradi... more This work looks at the main themes, concepts and lead figures of the Hellenic philosophical tradition that not only influenced the Greek and then Latin world in antiquity, but also had a lasting influence on intellectual and theological development in the West right up until the Age of Enlightenment. To this end, the focus is on the Socratic tradition, through Plato and then Aristotle, and then the Stoic tradition whose strong imprint can be found on early Christianity, representing the core seed of Western theological evolution via Judaism, Christianity and then Islam.

Revista Forestal Mesoamericana Kurú, 2015

Waste and Biomass Valorization, 2015

AbstractPropose The present study shows the results of the evaluation of the pellets made from tw... more AbstractPropose The present study shows the results of the evaluation of the pellets made from two forestry crops and eight agricultural crops in Costa Rica by employing a 50 kW domestic stove.MethodsThe following variables were evaluated: flame outlet and flue gas temperatures and emissions (CO2, CO, NO, NO2, NOx and SO2).ResultsIt was found that the pellet consumption varies from 2.5 to 3.4 kg/h, where the former corresponds to Tectona grandis and the latter to the mesocarp oil palm fruit. Flame outlet temperature varied from 400 to 623 °C and flue gas temperature varied from 205 to 322 °C, where the lowest temperature corresponds to Phyllostachys aurea and the highest to the oil palm residue. T. grandis showed the highest variation in temperature, while Cupressus lusitanica showed the lowest variation. A result that stands out in the measurement of emissions is that the two forestry crops show the lowest values.ConclusionsDifferent type of pellet produces different behaviour in domestic stove. Gynerium sagittatum and C. lusitanica were with greater heat generation and Pennisetum purpureum and T. grandis with the lowest heat generation.

Pharmaceutical Development and Technology, 2015

Abstract Ulceration of the foot in diabetes is common and disabling, and frequently leads to ampu... more Abstract Ulceration of the foot in diabetes is common and disabling, and frequently leads to amputation of the leg. The pathogenesis of foot ulceration is complex, clinical presentation variable and management requires early expert assessment. Despite treatment, ulcers readily become chronic wounds. Chronic wounds are those that remain in a chronic inflammatory state failing a normal healing process patterns. This is partially caused by inefficient eradication of opportunistic pathogens like Pseudomonas aeruginosa. We propose its control or eradication will promote wound healing. Lactobacillus plantarum cultures supernatants (LAPS) shows antipathogenic and pro-healing properties. The main objective was to design two pharmaceutical dosage forms by using LAPS as active pharmaceutical ingredient and to perform its quality control, in vitro activity conservation tests and human trials (safety evaluation). Both selected formulations reach the technological quality expected for 120 days, shows adequate occlusive characteristics and proper adhesion to human skin. From the in vitro release assays were found that LAPS shows adequate release from matrix and maintain its antimicrobial and anti-biofilm activity. First human trials were developed and neither edema nor erythema on healthy skin voluntaries was found. We conclude that C80 and C100 are adequate for their use in future clinical trials to demonstrate a comprehensive therapeutic effectiveness in ischemic chronic wounds.

Journal of Social Philosophy Research, 2014

As one digs into how philosophy emerges in the West, and how Reason began to rise in influence at... more As one digs into how philosophy emerges in the West, and how Reason began to rise in influence at the dawn of civilization (a feature which so notably marked the civilization of Ancient Greece and in turn is the marked characteristic of Western civilization to this day), it becomes evident that this philosophical movement represents not only a somewhat rebellious socio-political force in the region that in turn provides some of the philosophical and metaphysical underpinnings of monotheism as it evolves into Christianity, but it also has profoundly influenced the worldview of the West even to this day, providing the semantic and intellectual framework within which we view the world around us, and within which the branches of science and study exist even to this day. The ancient Greek philosophers were the first individual to challenge the truth of the mythologies that had so profoundly influenced the ancient civilizations of the East and West, and were the first people to begin to explore the nature of knowledge, what could be known, or perhaps better put what in fact could be known to be, itself, providing us with philosophical and intellectual frameworks which came to shape Western civilization for several thousand years and still remains a profound influence on how we approach knowledge, and scientific study today.

Immunobiotics and Immunogenics, 2013

Mathematics Magazine, 1974

Journal of Traumatic Stress, 2002

The Journal of Immunology, 2003

Collagen-induced arthritis (CIA) and proteoglycan-induced arthritis (PGIA) are murine models for ... more Collagen-induced arthritis (CIA) and proteoglycan-induced arthritis (PGIA) are murine models for rheumatoid arthritis both in terms of their pathology and genetics. Using the F2 hybrids of the CIA-susceptible, but PGIA-resistant DBA/1 mice, and the CIA-resistant, but PGIA-susceptible BALB/c mice, our goals were to 1) identify both model-specific and shared loci that confer disease susceptibility, 2) determine whether any pathophysiological parameters could be used as markers that distinguish between nonarthritic and arthritic mice, and 3) analyze whether any immune subtraits showed colocalization with arthritis-related loci. To identify chromosomal loci, we performed a genome scan on 939 F2 hybrid mice. For pathophysiological analyses, we measured pro- and anti-inflammatory cytokines (IL-1, IL-6, TNF-α, IFN-γ, IL-4, IL-10, IL-12), Ag-specific T cell proliferation and IL-2 production, serum IgG1 and IgG2 levels of both auto- and heteroantibodies, and soluble CD44. In addition to mult...

International Journal of Gynecology & Obstetrics, 2000

International Biodeterioration & Biodegradation, 2011

Fertility and Sterility, 2006

Bioorganic & Medicinal Chemistry Letters, 2002

Compounds 1-18 have been synthesized and tested in vitro against the protozoa Giardia lamblia, En... more Compounds 1-18 have been synthesized and tested in vitro against the protozoa Giardia lamblia, Entamoeba histolytica and the helminth Trichinella spiralis. Inhibition of rat brain tubulin polymerization was also measured and compared for each compound. Results indicate that most of the compounds tested were more active as antiprotozoal agents than Metronidazole and Albendazole. None of the compounds was as active as Albendazole against T. spiralis. Although only compounds 3, 9 and 15 (2methoxycarbonylamino derivatives) inhibited tubulin polymerization, these were not the most potent antiparasitic compounds.

Bioorganic & Medicinal Chemistry Letters, 2013

redalyc.uaemex.mx

Agronomía Costarricense. Universidad de Costa Rica. agro_costarricense@cia.ucr.ac. cr. ISSN (Vers... more Agronomía Costarricense. Universidad de Costa Rica. agro_costarricense@cia.ucr.ac. cr. ISSN (Versión impresa): 0377-9424. COSTA RICA. 2008. Federico Masís / Juan Valdez / Tatiana Coto / Sandra León. RESIDUOS DE AGROQUÍMICOS ...