Optimization of the carrier concentration in phase-separated half-Heusler compounds

Inspired by the promising thermoelectric properties of phase-separated half-Heusler materials, we investigated the influence of electron doping in the n-type Ti_(0.3−x)Zr_(0.35)Hf_(0.35)NiSn compound. The addition of Nb to this compound led to a significant increase in its electrical conductivity, and shifted the maximum Seebeck coefficient to higher temperatures owing to the suppression of intrinsic carriers. This resulted in an enhancement of both the power factor α^2σ and figure of merit, zT. The applicability of an average effective mass model revealed the optimized electron properties for samples containing Nb. There is evidence in the literature that the average effective mass model is suitable for estimating the optimized carrier concentration of thermoelectric n-type half-Heusler compounds

OT Graduate Students’ Perceived Preparedness for Level II Fieldwork: Traditional, Nontraditional and Mixed Fieldwork I Experiences

This study explored the perceived level of preparedness of occupational therapy (OT) graduate students for entering Level II fieldwork after completing nontraditional, traditional, and mixed Level I fieldwork experiences. This mixed-methods exploratory study included an online 22-question survey that was delivered to Occupational Therapy Doctoral (OTD) and Master of Occupational Therapy (MOT) programs throughout the United States. Participants were selected through voluntary convenience response sampling. Students (N=145) self-reported their level of preparedness for Level II fieldwork experiences. The quantitative data collected in this study reflected a statistically significant difference between Level I fieldwork experience-related questions for the three groups, including traditional, nontraditional, and mixed traditional and nontraditional fieldwork experiences. More specifically, students that took traditional fieldwork experiences felt that traditional fieldwork positively contributed to their preparedness for Level II fieldwork compared to those who took nontraditional fieldwork or a mix of traditional and nontraditional fieldwork. The qualitative data, analyzed through thematic analysis, indicated that students felt a combination of nontraditional and traditional fieldwork provided the most significant benefit from Level I fieldwork experiences. Results suggest that most OT students preferred either a combination of nontraditional Level I fieldwork and traditional Level I fieldwork or solely traditional Level I fieldwork for increasing their perceived preparedness prior to starting Level II fieldwork. This study has implications for OTD and MOT fieldwork curriculum development and implications for addressing the needs of OT students to feel better prepared for Level II fieldwork

Encapsulation of aqueous-core nanocapsules in PLLA multicompartments microparticles

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La formación del concepto de función en alumnos de educación media superior

En este artículo se describe la realización de un taller cuyo diseño responde al marco de una investigación en proceso, que explora los saberes que sobre el concepto de función tienen los alumnos de educación media superior (EMS) y pretende analizar los efectos que presenta la puesta en escena de situaciones didácticas sobre la formación del concepto de función. En la primera etapa de la investigación se están explorando dichos saberes en 30 alumnos de EMS y 10 de los primeros semestres de la licenciatura en matemáticas en Acapulco, Guerrero, México. También se han diseñado situaciones didácticas para abordar este concepto, a fin de que se instrumenten en la escuela. Con estos avances se estructuró el taller para interesados en este campo y realizado en Relme 17 con la participación de siete profesores

Caracterización bromatológica de la berenjena (Solanum melongena L.) en el departamento de Córdoba.

Sumario (Es)Berenjena-Solanum melongen

Biocompatible superparamagnetic poly(thioether-ester) nanoparticles via miniemulsion technique

Biocompatible polymeric nanoparticles were obtained via thiol-ene polymerization of a biobased monomer in miniemulsion. The α,ω-diene-diester monomer was synthesized through esterification reaction of a glycerol derivative, namely 1,3-propanediol, with 10-undecenoic acid, a long-chain diene carboxylic acid. The biobased poly(thioether-ester), PTEE, nanoparticles were submitted to cytotoxicity and hemolysis analyses. High cell viability and no significant changes in cell morphology were observed. Lastly, hemolysis assays revealed blood compatibility and therefore PTEE nanoparticles have been shown to be a potential alternative drug delivery vector for intravenous administration. The poly(thioether-ester) was also employed to encapsulate magnetic nanoparticles (MNPs) by miniemulsification technique. Please click Additional Files below to see the full abstract

Enzimatic polycondensation of 1,4-butanediol and diethyl succinate

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Caracterización bromatologíca de la berenjena (Solanum melongenaL.) en el Departamento de Córdoba

The bromatologic composition of 8 selected eggplant lines (L006, L007, L008, L012, L014, L015, L016, L019), was evaluated based on humidity, ashes, total protein, ethereal extract and crude fiber using the methods of the A.O.A.C. 930, 15/90, 942. 05/90, 955. 04/90, 920. 39/90 and 962. 09/90, respectively. The total carbohydrates were calculated by the difference between the 100% and all other components but fiber. Within ashes calcium, sodium, phosphor, iron, and potassium were quantified. Potassium showed the highest quantity with a mean of 206,21 mg, calcium and sodium also showed high proportion levels with means of 68, 62 and 58,22 mg, respectively. Iron and phosphorus showed low levels in all genotypes but in line L014 with values above 15 mg. The genotypes with higher nutritious values are L016, L007, L012, L014 y L016 which, together with their desirable characteristics are the ones with potential for commercial exploitation in the national market.Se valoró la composición bromatológica de ocho (8) líneas de berenjena (L006, L007, L008, L012, L014, L015, L016 y L019), de excelentes atributos agronómicos, a las que se les determinó humedad, cenizas, proteína total, extracto etéreo y fibra cruda, utilizando los métodos de la A.O.A.C. 930. 15/90, 942. 05/90, 955. 04/90, 920. 39/90 y 962. 09/90, respectivamente. Los carbohidratos totales, se calcularon por diferencia entre el 100% y los demás componentes, excepción de la fibra. En las cenizas, se cuantificó los minerales hierro, fósforo, calcio, sodio y potasio. El mineral de más alto nivel fue el potasio, con una media de 206,21 mg, igualmente se encontraron altas proporciones de calcio y sodio con unas medias de 68,62 mg y 58,22 mg respectivamente. El hierro al igual que el fósforo, acusaron guarismos muy bajo en todos los genotipos, excepto en la línea LO14, que registró valores por encima de los 15.00 mg. Los genotipos de mayores ventajas a nivel nutritivo son las líneas L006, L007, L012, L014 y L016; que asociados con sus bondades agronómicas, constituyen genotipos con potencialidad de comercialización en el mercado nacional