Exponential Mixing for a Stochastic PDE Driven by Degenerate Noise

We study stochastic partial differential equations of the reaction-diffusion type. We show that, even if the forcing is very degenerate (i.e. has not full rank), one has exponential convergence towards the invariant measure. The convergence takes place in the topology induced by a weighted variation norm and uses a kind of (uniform) Doeblin condition.Comment: 10 pages, 1 figur

Metal Removal by Seaweed Biomass

Environmental metal pollution is a serious public problem, and it has become an issue leading to research in the effluent remediation area. Techniques involving biosorption processes have been found to be promising due to the low cost of nonliving biomaterials, which have the potential to adsorb metal ions from wastewaters. One of the most promising types of biomasses to be used as biosorbents is the seaweed biomass, particularly from brown algae. The biosorption capability of the seaweed biomass relies on their cell wall chemical composition, mainly composed of alginates and fucoidans, molecules with a high presence of functional groups that interact with metal ions. This book chapter focuses on the use of seaweed biomass for metal biosorption and the chemical basis underlying the process. The current state of the commercial status of biosorption technology based on seaweed biomass is presented. Examples of complementary uses of the algae biomass other than industrial wastewater cleaning processes are presented, and the potential reuse of the biomass after the biosorption focused on biofuel production is discussed

Prueba de habilidades CCNA 2019.

Se buscar dar solución a dos escenarios identificando el grado de desarrollo de competencias y habilidades que fueron adquiridas a lo largo del diplomado. Se pone a prueba los niveles de comprensión y solución de problemas relacionados con diversos aspectos de Networking.Main goal is solving two scenarios by identifying the degree of development of skills and abilities that were acquired throughout the course. Levels of understanding and solution of problems related to various aspects of Networking are tested

Beiträge zu Appliklationen von 4-Hydroxy-1,3-thiazolen

Eine Reihe neuer und funktioneller Chromophore/Fluorophore auf der Basis von 4-Hydroxy-1,3-thiazolen wurde synthetisiert. Aus diesem Portfolio an Derivaten wurden Anwendungen entwickelt und die Verbindungen hinsichtlich ihrer Verwendung als Sensoren und Antioxidantien evaluiert. Innerhalb des Bereichs Sensoren wurden die neuartigen O-Silylether der 4-Hydroxythiazole synthetisiert und vollständig charakterisiert. Die hohe Fluoreszenzintensität dieser Verbindungen zusammen mit der bekannten Affinität von Silizium gegenüber Fluorderivaten wurden genutzt, um einen neuen Fluoridionen-Sensor zu entwickeln. Die Desilylierung dieser Fluorophore durch Fluorid kann in polaren Lösungsmitteln und sogar in Wasser „dual“ detektiert werden. Dieses neue Fluoridionen-Detektions-System stellt durch die starke Änderung der Fluoreszenzmaxima von blau nach rot, durch ihre Selektivität gegenüber anderen Anionen und ebenso durch die hohe Empfindlichkeit eine Weiterentwicklung gegenüber anderen Verfahren dar. Im Rahmen der Entwicklung von Sensoren wurden weiterhin die tricyclische Lactone auf Basis von 4-Hydroxythiazolen synthetisiert und vollständig charakterisiert. Diese Heterocyclen zeigen unter UV-Bestrahlung eine sehr starke Festkörper-Fluoreszenz. Die Verbindungen sind Produkte einer intramolekularen Veresterung die nach der klassischen HANTZSCH SYNTHESE stattfindet und enthalten drei fusionierte Ringe, welche als rigides System wesentlich die Fluoreszenz im Festkörper und in Lösung prägen. Röntgenkristallografische Aufnahmen der Verbindungen bestätigen koplanare Strukturen und damit eine Erweiterung des Chromophors. In Lösung fluoreszieren die tricyclischen Lactone im violett-blauen Bereich des sichtbaren Spektrums. Eine drastische Änderung der Absorption und der Fluoreszenz wird beobachtet, wenn die Substanzen mit Basen oder Säuren umgesetzt werden. Auf Grund ihrer strukturellen Verwandtschaft zu den Phenolen wurde die antioxidative Kapazität der 4-Hydroxythiazole mittels der TEAC-Methode untersucht. Die Affinität gegenüber Radikalen ist auf die Bildung von Thiazol-Analoga der Phenoxy-Radikale zurückzuführen und die Eigenschaften als Antioxidans sind von den Substituten am R2 des Thiazol-Kerns abhängig. Schließlich wurden die Solvatochromie und der Effekt des Substituenten R2 auf die photophysikalischen Eigenschaften mehrerer 4-Hydroxythiazole untersucht. 4-Hydroxythiazole sind besonders empfindliche Chromophore und Fluorophore die auf die Polarität des Lösungsmittels reagieren. 4-Hydroxythiazole mit 4-Nitrophenylresten als R2 stellen eine neue Subklasse innerhalb dieser Verbindungen dar. Sie zeigen im Gegensatz zu ihren Analoga mit 2-Nitrophenylresten beachtliche Farbänderungen in Lösungen bei Polaritätsänderung der Umgebung. Dieser Effekt wird in dieser Arbeit als „Omnichromie“ bezeichnet und wurde erstmalig anhand dieser 4-Hydroxythiazole beobachtet und untersucht. Eine umfassende Klärung dieses Phänomens steht noch aus und ist weiteren Arbeiten auf diesem Gebiet vorbehalten. Die Resultate sollen zu weiteren Untersuchungen auf diesem Gebiet anregen da sie ein hohes Potenzial für Anwendungen, im Besonderen auf dem Gebiet der Sensor-Technologie aufweisen

An Intelligent Transportation System: the Quito City Case Study

Managing traffic in a large city has become a topic of great interest in both politics and science. The costs of poor traffic management have been quantified as losses equal to millions of dollars, not counting the unquantifiable value of the time that a person loses in traffic jams. Intelligent transport systems (ITS) offer a set of innovative solutions specific to the management of different modes of transport. This article focuses on the development of an ITS for the city of Quito that allows smart decision-making to direct heavy haul transporters that want to enter the city via one of its main access routes. Technologies such as Sensor Web Enablement (SWE), in association with the Message Queuing Telemetry Transport (MQTT) communication protocol, facilitate the development of a vehicular management platform/system capable of sending notifications in real-time and issuing instructions to drivers regarding traffic delays along routes, average speeds, etc. The system supports a network of heterogeneous sensors accessible through the web. It can integrate any device that uses HTTP protocol. Time interval and location range testing have been undertaken to refine the accuracy of the system and make it adaptable to any geographic situation. The system allows communicate with the server through MQTT or through web services, using technologies such as: MongoDB and GeoJSON. One of the most relevant results is that the degree of accuracy of the system is within appropriate ranges when compared to commercial applications such as Google Maps and Waze

Effectiveness of Blood Flow Restriction Training on Isokinetic Muscle Strength of the Quadriceps

Blood flow restriction (BFR) training has proven to be an effective method of producing muscle hypertrophy and increased strength, but the most efficacious percentage of blood flow occlusion while performing aerobic training is unclear. PURPOSE: To examine the effectiveness of BFR training while using two different cuff pressures on the strength of the quadriceps muscle group after three weeks of cycling training for fifteen-minute sessions performed three times per week. METHODS: Ten healthy participants (4 female, 6 male, 26 ± 3 years) were randomly assigned to one of two groups: BFR with 60% occlusion applied to the right quadricep or BFR with 80% occlusion applied to the right quadricep. The training protocol consisted of cycling on a stationary ergometer for 15 minutes at 70 RPM with 25 watts of resistance, with the BFR cuff inflated to their assigned occlusion percentage, performed three times a week for three weeks. Muscle strength of the quadriceps was measured bilaterally at baseline and at three weeks using an isokinetic dynamometer at speeds of 60, 180, and 300 degrees per second using a standardized knee extension protocol. Given the normally distributed data for torque and work of the knee extensors, a 2 x 2 (group by time) ANOVA was used to perform between and within-group comparisons. Statistical significance was at an alpha of 0.05 for all analyses. RESULTS: The ANOVA revealed no between group differences but statistically significant changes within time for torque at 180 (p\u3c.001) and 300 (p=0.01) degrees per seconds. Work at 180 and 300 degrees per seconds were also statistically significant (p\u3c.001 and .013, respectively) across time. CONCLUSION: It appears there are no differences between the two different BFR occlusion pressures between groups, indicating both occlusion pressures elicit similar gains in quadriceps strength over a three-week training period. However, it seems both groups displayed improved torque and work at higher speeds, indicating that BFR training in this manner and protocol provides more of a benefit in increasing muscular endurance, opposed to strength itself

Effectiveness of Blood Flow Restriction Training on Aerobic Performance During Cycling Exercise in Healthy Adults

Blood flow restriction (BFR) has emerged as an alternate rehabilitation modality, intending to enhance muscular strength, hypertrophy, metabolic response, and functional outcomes in various populations. However, there is a lack of research evidence on the efficacy of BFR during aerobic exercise. PURPOSE: To compare aerobic capacity following a cycling protocol with BFR at 60% (BFR-60) 80% (BFR-80) occlusion. METHODS: Ten healthy participants (26 ± 3.0 years; 6 males; 4 females) were randomly assigned to either: BFR-60 or BFR-80. Aerobic Capacity was measured at baseline, and three weeks during a sub-maximal stationary cycle ergometer protocol connected to a metabolic analyzer for the assessment of peak oxygen consumption (VO2 peak). Aerobic testing consisted of performing the YMCA protocol which consisted of pedaling at 70 rev/min with a load of 25-watts. Heart Rate (HR) was monitored continuously at the end of the first 3 minutes and used to determine the load increase. Subjects cycled for 15 minutes at which point a 25-watt increase occurred every 3 minutes until the participant reached one or more of the following criteria: 80% of their predicted HR (T80) using the HR reserve formula, an RER \u3e 1.0, or a leveling of the oxygen curve. BFR cuffs were applied between baseline and 3-week reassessment of aerobic capacity at the appropriate level of occlusion and a cycling protocol was performed (15 minutes; 3 d/wk.). Given the small sample size and the non-normal data distribution for the variable of T80, a Mann-Whitney and Wilcoxon tests were used to evaluate between and within (time) groups differences, respectively. For the between-group comparison, a composite score for T80 based on the pre-post difference was calculated for both groups. Then this calculated difference was used to compare both groups. Peak VO2 was normally distributed, therefore, a 2x2 (group by time) ANOVA was used to perform between and within-group comparisons. Statistical significance was at an alpha of 0.05 for all analyses. RESULTS: The between group comparisons of the T80 was not statistically significant. The within group comparison for T80 for the BFR-60 group approached significance (p = 0.08) while the BFR-80 group was not significant (p = 0.89). The within time ANOVA approached significance (p = 0.09) while there were no between group differences (p = 0.99). CONCLUSION: Aerobic performance over time was seen to improve primarily in the 60% occlusion BFR group. The sample size or short intervention duration might have affected the effectiveness of this intervention

Marketing de contenidos en la red social Facebook y la satisfacción del cliente de una joyería ubicada en San Borja, Lima 2021

La presente investigación tuvo el objetivo general de medir la correlación de marketing de contenidos en la red social Facebook y la satisfacción del cliente de una joyería ubicada en San Borja, Lima 2021. Para ello, se empleó la metodología de enfoque cuantitativo, con un alcance descriptivo-correlacional y diseño no experimental-transversal; la población estuvo conformada por clientes de la joyería, de donde se tomó una muestra de 130 personas, la técnica aplicada fue la encuesta con su instrumento el cuestionario. Los resultados fueron que existe una relación muy alta y positiva, con un nivel de coeficiente de correlación del 0,808% entre las variables marketing de contenidos y la satisfacción del cliente, de igual manera se mostró relaciones positivas entre las dimensiones marketing de contenidos con la variable satisfacción del cliente; además que se diseñaron estrategias de contenidos para la página de Facebook de la joyería, que les ayudará a orientarse a lograr la satisfacción del cliente. Por último, se concluye que el marketing de contenidos tiene una correlación alta y positiva con la satisfacción del cliente de la joyería, en la medida en que se apliquen estrategias de marketing contenido en su página de Facebook el cliente estará más satisfecho con la marca

Sub-utilización de los recursos tecnológicos en el proceso de enseñanza - aprendizaje de los estudiantes de la media vocacional de la Institución Educativa Distrital Rodrigo de Bastidas.

Es lamentable que los procesos pedagógicos de una institución sean iguales a los que se llevaban años atrás, aun después del incursiona miento de nuevos recursos como lo son las TICs, y peor aún que no signifique nada para los actores que intervienen en los mismos. Esta investigación pretende indagar acerca de las causas de esta situación y aportar desde nuestra inquietud una perspectiva más dinamizadora y futurista a los procesos que se vienen dando, no valdrá nada si se sigue teniendo la misma percepción del área de tecnología e informática, donde precisamente es ahí por donde se debe empezar a ahondar para la innovación y evolución en ciencia y tecnología en nuestro distrito. Teniendo en cuenta lo anterior podemos inferir que la institución educativa objeto de estudio, cuenta con una adecuada dotación de recursos tecnológicos pero que a nuestro parecer no se les está dando un uso adecuado