Electro Conductive Alumina Nanocomposites From Different Alumina-Carbides Mixtures

This work presents the results of an electro-discharge machined ceramic composites consisting of a base non-conductive ceramic component such Al2O3, to which is added sufficient amounts of an electro-conductive ceramic nanoparticles such as TiC, TiNC, NbNC, TaNC, and SiC (whiskers) to achieve an electrical resistance of less than about 100W.cm. With these compositions intricate geometries and features as holes, chamfers, slots, angles, changing radii and complex curves can be electro-discharge machined (EDM) into the ceramic body after Pulsed Electrical Current Sintering (PECS) to achieve maximum density and mechanical properties. In EDM, the electrically conductive workpiece or ceramic blank is eroded by electric discharges or sparks which on a small scale generate localized shock waves and intense heat. The four compositions studied were in the same proportion for all raw materials: alumina 42 (vol %) + conductive material (TiC, TiNC, NbNC, and TaNC) 22 (vol %) + SiCw 36 (vol %). Processing was carried out mixing raw materials in the suitable proportions in a polypropylene container with zirconia balls and isopropanol media for 72 hours in order to guarantee the homogeneity of the final compositions. The powders were dried and introduced into a PECS furnace for sintering to 1650°C (100 MPa/2 min). The diameters of the pieces obtained were 20 and about 40 mm and 7 mm thickness. SiC whiskers reinforced electrically conductive ceramic compositions provide a fully dense material with optimal mechanical properties. The capability of electro-discharge machining obtains good surface quality, chip-free edges, dimensional accuracy and complex shapes. The fracture toughness is improved two to three fold over individual ceramic components. Strength and hardness is also increased. Some composites were tested as a cutting tool to machine IN-718 nickel-base superalloy industrial laminating cylinders. The composites were formed and electro-discharge machined to a standard size cutting inser

Avaliação do uso de resíduo de serragem de pedra Cariri (RSPC) para produção de concretos convencionais

No estado do Ceará, na região do Cariri, um minério calcário laminado, comercialmente conhecido como pedra Cariri, é muito explorado. Os processos de exploração e beneficiamento desse minério são causas da geração de resíduos. Um dos tipos de resíduo gerado é o decorrente da serragem de pedra Cariri, denominado de resíduo de serragem de pedra Cariri (RSPC). Nesta pesquisa, avalia-se a viabilidade do uso de RSPC como substituição parcial do cimento na produção de concretos convencionais. Foram determinadas as características químicas e físicas do RSPC. A influência foi avaliada através das propriedades mecânicas (resistência à compressão axial e diametral) e parâmetros de durabilidade (absorção por imersão e por sucção capilar). Foram produzidos 9 traços, variando a relação a/c (0,45; 0,55; 0,65) e os teores de substituição (0%, 10% e 20%) do cimento. Os resultados demonstram que a utilização de RSPC no concreto proporcionou uma redução nas resistências à compressão e à tração por compressão diametral. Entretanto, em relação aos parâmetros de durabilidade, os concretos com RSPC apresentaram comportamento compatível com os concretos de referência. De um modo geral, do ponto de vista técnico, o RSPC não proporcionou resultados satisfatórios para aplicação em concreto

NIÑOS Y ADOLESCENTES. SU DEPENDENCIA DE LA TECNOLOGÍA MÓVIL

CHILDREN AND ADOLESCENTS. THEIR DEPENDENCE ON MOBILE TECHNOLOGYRESUMENLa investigación se realizó para medir la dependencia que tienen tanto los padres como los niños – adolescentes con edades entre 8 y 16 años a los dispositivos móviles inteligentes, para los adultos de hoy lo indispensable es tener uno en casa y asi mantener entretenidos a sus hijos. Los aparatos tecnológicos móviles tienen varios rasgos que lo hacen extraordinariamente atractivo para los niños – adolescentes: les brinda autonomía, respecto a sus padres, permite que la comunicación fluya con los compañeros, o la expansión y el apoyo de las conexiones interpersonales. El articulo tiene por objetivo principal medir la dependencia que tienen tanto padres como hijos a la tecnología móvil, se realizaron ciento cuarenta encuestas a un grupo de padres de la ciudadela Los Perales de la ciudad de Babahoyo, mismas que fueron tabuladas en un reconocido programa estadísticos informático llamado SPSS, los resultados demuestran que la mayor intensidad de uso está en niños – adolescentes de ocho a dieciséis años, situando la dependencia de celulares y tabletas sobre el 40% de las demás tecnologías móviles. Por lo que se concluye que la tecnología móvil hoy en día es parte indispensable en los hogares ecuatorianos y por qué no decir en todo el mundo.PALABRAS CLAVE: Tecnología móvil; Internet; destreza digital; Niños digitales; Redes sociales.ABSTRACTThe research was conducted to measure the dependence of both parents and children, adolescents aged 8 to 16 years on smart mobile devices, for adults today it is essential to have one at home and thus keep their children entertained. Mobile technological devices have several features that make it extraordinarily attractive for children - adolescents: it gives them autonomy from their parents, allows communication to flow with peers, or the expansion and support of interpersonal connections. The main objective of the article is to measure the dependence of parents and children on mobile technology. One hundred and forty surveys were carried out on a group of parents from the city of Los Perales in the city of Babahoyo, which were tabulated in a well-known statistical program SPSS, the results show that the greatest intensity of use is in children - adolescents from eight to sixteen years, placing cell and tablet dependence on 40% of other mobile technologies. So it is concluded that mobile technology today is an indispensable part of Ecuadorian homes and why not say around the world.KEYWORDS: Mobile technology; Internet; Digital dexterity; Digital children; Social networks

NIÑOS Y ADOLESCENTES. SU DEPENDENCIA DE LA TECNOLOGÍA MÓVIL

CHILDREN AND ADOLESCENTS. THEIR DEPENDENCE ON MOBILE TECHNOLOGYRESUMENLa investigación se realizó para medir la dependencia que tienen tanto los padres como los niños – adolescentes con edades entre 8 y 16 años a los dispositivos móviles inteligentes, para los adultos de hoy lo indispensable es tener uno en casa y asi mantener entretenidos a sus hijos. Los aparatos tecnológicos móviles tienen varios rasgos que lo hacen extraordinariamente atractivo para los niños – adolescentes: les brinda autonomía, respecto a sus padres, permite que la comunicación fluya con los compañeros, o la expansión y el apoyo de las conexiones interpersonales. El articulo tiene por objetivo principal medir la dependencia que tienen tanto padres como hijos a la tecnología móvil, se realizaron ciento cuarenta encuestas a un grupo de padres de la ciudadela Los Perales de la ciudad de Babahoyo, mismas que fueron tabuladas en un reconocido programa estadísticos informático llamado SPSS, los resultados demuestran que la mayor intensidad de uso está en niños – adolescentes de ocho a dieciséis años, situando la dependencia de celulares y tabletas sobre el 40% de las demás tecnologías móviles. Por lo que se concluye que la tecnología móvil hoy en día es parte indispensable en los hogares ecuatorianos y por qué no decir en todo el mundo.PALABRAS CLAVE: Tecnología móvil; Internet; destreza digital; Niños digitales; Redes sociales.ABSTRACTThe research was conducted to measure the dependence of both parents and children, adolescents aged 8 to 16 years on smart mobile devices, for adults today it is essential to have one at home and thus keep their children entertained. Mobile technological devices have several features that make it extraordinarily attractive for children - adolescents: it gives them autonomy from their parents, allows communication to flow with peers, or the expansion and support of interpersonal connections. The main objective of the article is to measure the dependence of parents and children on mobile technology. One hundred and forty surveys were carried out on a group of parents from the city of Los Perales in the city of Babahoyo, which were tabulated in a well-known statistical program SPSS, the results show that the greatest intensity of use is in children - adolescents from eight to sixteen years, placing cell and tablet dependence on 40% of other mobile technologies. So it is concluded that mobile technology today is an indispensable part of Ecuadorian homes and why not say around the world.KEYWORDS: Mobile technology; Internet; Digital dexterity; Digital children; Social networks

Evaluación de Ozonoterapia en Dermatopatía Generalizada en Perros

Se realizó un estudio experimental en 30 perros con dermatopatías generalizadas en el consultorio veterinario Bocca de Cannes en la ciudad de Guayaquil. El objetivo fue evaluar la rapidez de la ozonoterapia en la remisión de las dermatopatías generalizadas así como también caracterizar las dermatopatías en función de la causa y severidad en perros. Se evaluó la eficacia de dicho tratamiento según tres esquemas de ozonoterapia para así relacionar con las variables independientes edad, sexo, raza y tipo de lesión. El tiempo promedio para evaluar la remisión es a los 21 días. Se pudo determinar que con la ozonoterapia se logró aumentar la velocidad de remisión de las lesiones, reduciendo el número de días de curación. Por los resultados de esta experiencia nos permitimos recomendar el uso de ozonoterapia para dermatopatías generalizadas en perros, sean éstas superficiales o profundas.An experimental study was performed on 30 dogs with generalized dermatopathies at the Bocca Veterinary Clinic of Cannes in the city of Guayaquil. This paper focuses on evaluating the rapidity of ozone therapy in the remission of generalized dermatopathies. The dermatopathies which is based on the function of the cause and severity in dogs was characterized. It was used to evaluate the effectiveness according to three ozone therapy schemes that are related to the independent variables: age, sex, race and type of injury. The average time to evaluate remission is 21 days. Hence, we were able to establish the fact that with the ozone therapy, the rate of remission of the lesions increases, thereby reducing the number of days of healing. From the results of this study, we hereby recommend the use of ozone therapy for generalized dermatopathies in dogs, whether superficial or deep

The San Blas Pluton: An example of Carboniferous plutonism in the Sierras Pampeanas, Argentina

New geochronological and geochemical data are reported for the San Blas Pluton (SBP), in the northwestern Sierra de Velasco, Sierras Pampeanas, which intrudes Ordovician granitoids developed during the Famatinian orogeny. A precise Carboniferous age of 340±3 Ma is established by U–Pb dating of zircon using a sensitive high-resolution ion microprobe (SHRIMP). The SBP illustrates several petrological and geochemical characteristics of previously reported Carboniferous granitoids in the Sierras Pampeanas. Their generation is consistent with a regional reheating of the crust at approximately 342 Ma, which resulted in the formation of relatively large amounts of granitic melts that were emplaced in higher crustal levels along master fractures (older master shear zones of Lower Paleozoic age). The SBP can be chemically defined as a typical A-type granitoid related to postcollisonal or postorogenic magmatism. Its high REE content and extraordinarily high U and Th concentrations may have economic significance. Many previously published Devonian and Carboniferous K–Ar dates are reset Ordovician ages, but the existence of other Carboniferous bodies in the Sierra de Velasco cannot be discounted until detailed mapping of the whole Sierra is completed.Centro de Investigaciones Geológica

Edad y recuento leucocitario como factores pronósticos en leucemia linfoblástica aguda: cohorte hgmla07

In order to establish the cutoff with prognostic implications for white blood cell count and age at diagnosis in adults with acute lymphoblastic leukemia (ALL), we conducted an observational, descriptive and analytical study nested in a retrospective cohort of patients with ALL treated by institutional protocol HGMLAL07 during 2007-2014. We study 255 patients, the 52.9% (n=135) were female and 47.1% (n=120) were male. The mean age was 31 (16-80) years-old. The disease-free survival (DFS) decreases in both genders after 20 years-old (p = 0.001). Leukocyte count average was 56.1 x 109/L (0.1-850 x 109/L). DFS decreases significantly from an equal or greater leukocyte count of 20 x 109/L (p<0.05). With this results, we can conclude that use foreign cutoff for age and leukocyte count could determine a bad prognosis stratification and a consequent suboptimal treatment.Con el objetivo de establecer la cifra de corte de leucocitos y edad con implicación pronostica en adultos con leucemia linfoblástica aguda (LLA), se efectuó un estudio observacional, descriptivo y analítico anidado en la cohorte retrospectiva de pacientes con LLA tratados mediante el protocolo institucional HGMLAL07 durante 2007-2014. Se estudiaron 255 pacientes, el 52.9% (n=135) correspondieron al género femenino y 47.1% (n=120) al género masculino. La media de edad fue de 31 (16-80) años. La supervivencia libre de la enfermedad (SLE) disminuyó en ambos géneros a partir de los 20 años (p=0.001). La media de leucocitos fue 56.1 x 109/L (0.1-850 x 109/L). La SLE disminuyó significativamente a partir de una cifra igual o mayor de 20 x 109/L (p<0.05). Con esto se puede concluir que emplear puntos de corte para leucocitos y edad obtenidos en poblaciones distintas pudiera condicionar una mala clasificación pronostica y un consiguiente tratamiento subóptimo

Effects Of Modafinil And Bromazepam On Decision-Making: A P300 Analysis

Drug influence on the decision making process has been scarcely studied. Researchers have driven the hypothesis that drugs might cause interference on cortical circuits. The aim of the present study is to evaluate the electrophysiological and behavioral changes occurring in the P300 after ingestion of modafinil (200mg), bromazepam (6mg) and placebo in healthy subjects exposed to a sensorimotor task based on the oddball paradigm. The sample for this study consisted of 10 subjects of both sexes, with ages ranging between 20 and 45, who were submitted to a quantitative electroencephalography. The experimental procedure was carried out in three visits, before and after drug ingestion. The results demonstrated a significant increase in the P300 latency and amplitude for the target condition, when compared to the non-target condition, for all analyzed electrodes. No significant difference was found for group or moment. A statistically significant difference was found for the group variable in the behavioral analysis. Such results suggest that the P300 is a measure, which is not sensitive to drug ingestion. On the other hand, the measure presented certain level of sensitivity when the subjects faced two different conditions in the decision making process orientation

Pervasive gaps in Amazonian ecological research

Biodiversity loss is one of the main challenges of our time,1,2 and attempts to address it require a clear un derstanding of how ecological communities respond to environmental change across time and space.3,4 While the increasing availability of global databases on ecological communities has advanced our knowledge of biodiversity sensitivity to environmental changes,5–7 vast areas of the tropics remain understudied.8–11 In the American tropics, Amazonia stands out as the world’s most diverse rainforest and the primary source of Neotropical biodiversity,12 but it remains among the least known forests in America and is often underrepre sented in biodiversity databases.13–15 To worsen this situation, human-induced modifications16,17 may elim inate pieces of the Amazon’s biodiversity puzzle before we can use them to understand how ecological com munities are responding. To increase generalization and applicability of biodiversity knowledge,18,19 it is thus crucial to reduce biases in ecological research, particularly in regions projected to face the most pronounced environmental changes. We integrate ecological community metadata of 7,694 sampling sites for multiple or ganism groups in a machine learning model framework to map the research probability across the Brazilian Amazonia, while identifying the region’s vulnerability to environmental change. 15%–18% of the most ne glected areas in ecological research are expected to experience severe climate or land use changes by 2050. This means that unless we take immediate action, we will not be able to establish their current status, much less monitor how it is changing and what is being lostinfo:eu-repo/semantics/publishedVersio