175 research outputs found
Complejidad e intensidad de cuidados en una unidad de cuidados respiratorios intermedios: estudio observacional restrospectivo comparativo prepandemia-postpandemia
Màster en Lideratge i Gestió dels Serveis d'Infermeria, Facultat d'Infermeria. Universitat de Barcelona. Curs: 2023-2024, Tutor: Jordi Adamúz TomásObjetivo: Identificar si existe un aumento en la complejidad e intensidad de cuidados que presentan los pacientes en un periodo postpandemia respecto a un periodo prepandemia en una unidad de cuidados intermedios. Ámbito: El estudio se llevará a cabo en una Unidad de Cuidados Respiratorios Intermedios que pertenece a un hospital de nivel terciario, centro de referencia para todo el eje sur de Cataluña. Metodología: Estudio observacional analítico comparativo retrospectivo de todos los episodios de cuidados recogidos en la unidad de estudio durante el año 2019 y 2023. Las variables principales serán la Complejidad de Cuidados y la Intensidad de Cuidados, evaluadas mediante las herramientas Factores Individuales de Complejidad de Cuidados (FICC) y el sistema de clasificación de pacientes ATIC. Además, se recogerán variables secundarias relacionadas con las características clínicas y sociodemográficas de la población estudiada. Estos datos serán recogidos de la historia clínica electrónica. Se realizará un análisis estadístico con estrategia descriptiva e inferencial. Aplicabilidad del estudio: Los resultados obtenidos asentarán las bases para una gestión de recursos enfermeros fundamentada en indicadores sensibles a la práctica enfermera que ayude a las enfermeras gestoras a ejercer una toma de decisiones centrada en las necesidades de cuidados de los pacientes, promoviendo espacios de trabajo positivos y seguros que contribuyan a una mejora en los resultados de salud de las personas
“Las aspiraciones laborales y el burnout en docentes universitarios de la Facultad de Ciencias Físicas y Matemáticas de una Universidad Nacional de Lima Metropolitana, 2017”
El presente estudio tuvo como objetivo establecer la relación que existe entre
las Aspiraciones Laborales y el Burnout en docentes universitarios de la
Facultad de Ciencias Físicas y Matemáticas de una Universidad de Lima
Metropolitana, 201 7. La investigación fue realizada bajo un enfoque
cuantitativo, de tipo descriptivo correlacional, cuyo diseño es transversal. La
muestra estuvo conformada por 149 docentes universitarios entre hombres y
mujeres. Los instrumentos utilizados fueron el cuestionario de Aspiraciones
Laborales y el Inventario de Burnout de Maslach – MBI. Los resultados
encontrados nos indican que no se encontró una relación estadísticamente
significativa entre las Aspiraciones Laborales y el Burnout en docentes
universitarios de la Facultad de Ciencias Físicas y Matemáticas de una
Universidad de Lima Metropolitana, 201
Critical water activity and critical water content of freeze-dried strawberry powder as affected by maltodextrin and arabic gum
The adsorption isotherms (20 °C) and the relationship between water content and glass transition temperature were modeled in freeze-dried strawberry powder studying the effect of the addition of maltodextrin and arabic gum. Both compositional and physicochemical analyses of strawberry pulp were performed. If the midpoint of the glass transition is considered, the critical water activity that ensures the glassy state of the product during storage at 20 °C increased from 0.094 to 0.237-0.341 when maltodextrin and arabic gum were added, respectively. The increase in the critical water content was not so marked and it was noticeable only in arabic gum added sample (from 7.5 to 8.9. g water/100. g product), being this sample more stable. © 2011 Elsevier Ltd.Mosquera, LH.; Moraga Ballesteros, G.; Martínez Navarrete, N. (2012). Critical water activity and critical water content of freeze-dried strawberry powder as affected by maltodextrin and arabic gum. Food Research International. 47(2):201-2016. doi:10.1016/j.foodres.2011.05.019S201201647
Characterization study of a thermal oil-based carbon black solar nanofluid
Carbon nanoparticles are very useful in solar thermal applications, since they absorb much of
the solar spectrum, are cheap and have excellent optical properties. Carbon nanoparticlesthermal
oil-based nanofluid was prepared using two-step method with diphenyl sulfone as
surfactant to achieve that nanoparticles remain suspended even at high temperatures. The
size particle distribution was studied using two Dynamic Light Scattering systems at room and
high temperature and also evaluated before and after exposing the nanofluid to a thermal
treatment so that conditions closer to those in real applications were replicated. Moreover,
the morphological changes due to the thermal treatment were observed with Transmission
Electron Microscopy. Finally, the optical properties as the ballistic transmittance, absorption
coefficient and scattering albedo of the base fluid as well as of the nanofluid were measured
using a spectrophotometer with and without integrating sphere. The results of this study
contribute to the knowledge about these solar nanofluids that are promising alternatives to
the conventional solar collectors
Aplicación de la terapia de afrontamiento del estrés en dos poblaciones con alto estrés: pacientes crónicos y personas sanas
El objetivo de este estudio ha sido valorar la eficacia de la terapia cognitivo-conductual en el manejo del estrés para comprobar si disminuye la percepción de los síntomas somáticos autoinformados, tanto en personas sanas como en personas con
lupus.This study has a double objective: on the one
hand, to corroborate, once again, the efficacy of cognitive-behavioural
stress management therapy in the control of certain psychological
processes and, on the other hand, to take one more step by testing
whether there is a reduction in the perception of self-reported somatic
symptoms both in healthy people and in those with a chronic disease.Este estudio ha sido financiado por el Ministerio de Educación y Ciencia, Proyecto I+D SEJ2007-61857/PSIC
On the relationship between the specific heat enhancement of salt-based nanofluids and the ionic exchange capacity of nanoparticles
Nanoparticles have been used in thermal applications to increase the specific heat of the molten salts used in Concentrated Solar Power plants for thermal energy storage. Although several mechanisms for abnormal enhancement have been proposed, they are still being investigated and more research is necessary. However, this nanoparticle-salt interaction can also be found in chemical applications in which nanoparticles have proved suitable to be used as an adsorbent for nitrate removal given their high specific surface, reactivity and ionic exchange capacity. In this work, the ionic exchange capacity mechanism for the nanoparticles functionalization phenomenon was evaluated. The ionic exchange capacity of silica and alumina nanoparticles dispersed in lithium, sodium and potassium nitrates was measured. Fourier-transform infrared spectroscopy tests confirmed the adsorption of nitrate ions on the nanoparticle surface. A relationship between the ionic exchange capacity of nanoparticles and the specific heat enhancement of doped molten salts was proposed for the first time
Effect of storage temperature on the crispness, colour and bioactive compounds of an orange snack obtained by freeze-drying
[EN] Purpose A healthy and easy-to-use orange snack obtained from the freeze-dried orange pulp puree is proposed. Once the commercial packaging of the snack has been opened, the effect of conventional home storage temperature on its physicochemical properties and on the content of bioactive compounds has been studied. This research aims to recommend the consumer, and therefore the manufacturer, the best conditions for home storage of this product, keeping its nutritional quality and antioxidant capacity, as well as maintaining its colour and crispness. Design/methodology/approach The water content, water activity, hygroscopicity, crispness, colour, vitamin C, beta-carotene, total phenolic compounds and antioxidant activity were characterised both when the orange snack was newly obtained and after one, two and six months of storage inside zipper bags, at 4 and 20 oC. Findings The results indicated that, in these conditions, the orange snack increased its water content, causing a loss in both its porosity and its characteristic crispness. Nevertheless, the bioactive compounds remained stable throughout the storage period, with the exception of beta-carotene, the content of which decreased markedly when the orange snack was stored at 20 oC. Originality/value Few studies have evaluated the stability of food products during home storage. The findings showed that the maximum storage time to ensure a proper texture of the orange snack studied is between two and six months, both at 4 and 20 oC. However, from the point of view of the conservation of both vitamin C and, especially, of beta-carotene, it is recommended that this product be stored in refrigeration.The authors thank the Ministerio de Economia, Industria y Competitividad of Spain for the financial support given through the Project AGL 2017-89251-R (AEI/FEDER-UE) and the Ministerio de Universidades for the FPU grant (FPU14 / 02633) awarded to Ms. Andrea Silva.Silva Espinoza, MA.; Camacho Vidal, MM.; Martínez-Navarrete, N. (2021). Effect of storage temperature on the crispness, colour and bioactive compounds of an orange snack obtained by freeze-drying. British Food Journal. 123(6):2095-2106. https://doi.org/10.1108/BFJ-11-2020-1061S20952106123
Influence of the production method on the thermophysical properties of high temperature molten salt-based nanofluids
The potential use of molten salt-based nanofluids as thermal energy storage material in Concentrated Solar Power plants has gained attention over the last years due to their enhanced storage capacity. The possible effects of the salt-based nanofluid production at industrial scale have not been yet investigated, as this could influence the nanoparticles agglomeration and therefore their thermal and flow properties. Four methods were evaluated for the production of solar salt-based nanofluids containing 1 wt% of silica nanoparticles. The particle size distribution, the stability, the rheological behaviour and the specific heat of the samples were measured. Nanofluids prepared by means of a dry mixing method presented the lowest viscosity, trimodal particle size distribution and lack of stability. The commonly used dissolution method coupled with oven drying in a petri dish as well as the ball milling method presented non-Newtonian behaviour and intermediate values of particle size and stability. The new spray drying method proposed provided a monomodal particle size distribution with high stability but the highest viscosity and shear thickening behaviour. Results suggest that the four methods evaluated are appropriate for specific heat enhancement (up to 21.1%) but a commitment between stability and viscosity has to be achieved
Use of different biopolymers as carriers for purposes of obtaining a freeze-dried orange snack
[EN] In addition to colour, one of the most important qualifies of a snack-type product is its crunchy texture. A freeze-dried fruit snack is characterised by its low water content, which creates the problem of a loss of crunchiness related to its low glass transition temperature (Tg). In this sense, a common technique with which to increase the Tg of these types of products is to add different biopolymers. However, these compounds can, at the same time, affect the colour and texture of the product. In this study, different biopolymers have been tested in order to discover their similarities or differences in terms of hygroscopicity, antiplasticising character, colour and impact on the mechanical properties of a freeze-dried orange snack formulated from their different mixtures. Gum Arabic, maltodextrin, starch modified with octenylsuccinic anhydride, pea fibre, bamboo fibre and native corn starch have been selected as biopolymers. The impact of any of them on the studied properties can be confirmed, without any of them being more or less effective than the others.The authors thank the Ministerio de Economia y Competitividad for the financial support given through the Project AGL 2017-89251-R (AEI/FEDER-UE) and the Ministerio de Educacion for the FPU grant (FPU14/02633) awarded to Ms. Andrea Silva.Silva Espinoza, MA.; Camacho Vidal, MM.; Martínez-Navarrete, N. (2020). Use of different biopolymers as carriers for purposes of obtaining a freeze-dried
orange snack. LWT - Food Science and Technology. 127:1-7. https://doi.org/10.1016/j.lwt.2020.109415S17127Acevedo, N. C., Schebor, C., & Buera, P. (2008). Non-enzymatic browning kinetics analysed through water–solids interactions and water mobility in dehydrated potato. Food Chemistry, 108(3), 900-906. doi:10.1016/j.foodchem.2007.11.057Agudelo, C., Igual, M., Camacho, M., & Martínez-Navarrete, N. (2016). Effect of process technology on the nutritional, functional, and physical quality of grapefruit powder. Food Science and Technology International, 23(1), 61-74. doi:10.1177/1082013216658368Bhusari, S. N., Muzaffar, K., & Kumar, P. (2014). Effect of carrier agents on physical and microstructural properties of spray dried tamarind pulp powder. Powder Technology, 266, 354-364. doi:10.1016/j.powtec.2014.06.038Brunauer, S., Deming, L. S., Deming, W. E., & Teller, E. (1940). On a Theory of the van der Waals Adsorption of Gases. Journal of the American Chemical Society, 62(7), 1723-1732. doi:10.1021/ja01864a025Brunauer, S., Emmett, P. H., & Teller, E. (1938). Adsorption of Gases in Multimolecular Layers. Journal of the American Chemical Society, 60(2), 309-319. doi:10.1021/ja01269a023Cano-Chauca, M., Stringheta, P. C., Ramos, A. M., & Cal-Vidal, J. (2005). Effect of the carriers on the microstructure of mango powder obtained by spray drying and its functional characterization. Innovative Food Science & Emerging Technologies, 6(4), 420-428. doi:10.1016/j.ifset.2005.05.003Chang, Y. P., Cheah, P. B., & Seow, C. C. (2000). Plasticizing—Antiplasticizing Effects of Water on Physical Properties of Tapioca Starch Films in the Glassy State. Journal of Food Science, 65(3), 445-451. doi:10.1111/j.1365-2621.2000.tb16025.xChoudhury, D., Sahu, J. K., & Sharma, G. D. (2011). Moisture sorption isotherms, heat of sorption and properties of sorbed water of raw bamboo (Dendrocalamus longispathus) shoots. Industrial Crops and Products, 33(1), 211-216. doi:10.1016/j.indcrop.2010.10.014Da Silva, F. C., da Fonseca, C. R., de Alencar, S. M., Thomazini, M., Balieiro, J. C. de C., Pittia, P., & Favaro-Trindade, C. S. (2013). Assessment of production efficiency, physicochemical properties and storage stability of spray-dried propolis, a natural food additive, using gum Arabic and OSA starch-based carrier systems. Food and Bioproducts Processing, 91(1), 28-36. doi:10.1016/j.fbp.2012.08.006Fabra, M. J., Talens, P., Moraga, G., & Martínez-Navarrete, N. (2009). Sorption isotherm and state diagram of grapefruit as a tool to improve product processing and stability. Journal of Food Engineering, 93(1), 52-58. doi:10.1016/j.jfoodeng.2008.12.029Fongin, S., Kawai, K., Harnkarnsujarit, N., & Hagura, Y. (2017). Effects of water and maltodextrin on the glass transition temperature of freeze-dried mango pulp and an empirical model to predict plasticizing effect of water on dried fruits. Journal of Food Engineering, 210, 91-97. doi:10.1016/j.jfoodeng.2017.04.025Goula, A. M., Karapantsios, T. D., Achilias, D. S., & Adamopoulos, K. G. (2008). Water sorption isotherms and glass transition temperature of spray dried tomato pulp. Journal of Food Engineering, 85(1), 73-83. doi:10.1016/j.jfoodeng.2007.07.015Greenspan, L. (1977). Humidity fixed points of binary saturated aqueous solutions. Journal of Research of the National Bureau of Standards Section A: Physics and Chemistry, 81A(1), 89. doi:10.6028/jres.081a.011Martínez-Navarrete, N., Salvador, A., Oliva, C., & Camacho, M. M. (2019). Influence of biopolymers and freeze-drying shelf temperature on the quality of a mandarin snack. LWT, 99, 57-61. doi:10.1016/j.lwt.2018.09.040Moraga, G., Martı́nez-Navarrete, N., & Chiralt, A. (2004). Water sorption isotherms and glass transition in strawberries: influence of pretreatment. Journal of Food Engineering, 62(4), 315-321. doi:10.1016/s0260-8774(03)00245-0Moraga, G., Talens, P., Moraga, M. J., & Martínez-Navarrete, N. (2011). Implication of water activity and glass transition on the mechanical and optical properties of freeze-dried apple and banana slices. Journal of Food Engineering, 106(3), 212-219. doi:10.1016/j.jfoodeng.2011.05.009Pittia, P., & Sacchetti, G. (2008). Antiplasticization effect of water in amorphous foods. A review. Food Chemistry, 106(4), 1417-1427. doi:10.1016/j.foodchem.2007.03.077Rahman, M. S. (2006). State diagram of foods: Its potential use in food processing and product stability. Trends in Food Science & Technology, 17(3), 129-141. doi:10.1016/j.tifs.2005.09.009ROOS, Y., & KAREL, M. (1991). Plasticizing Effect of Water on Thermal Behavior and Crystallization of Amorphous Food Models. Journal of Food Science, 56(1), 38-43. doi:10.1111/j.1365-2621.1991.tb07970.xSogabe, T., Kawai, K., Kobayashi, R., Jothi, J. S., & Hagura, Y. (2018). Effects of porous structure and water plasticization on the mechanical glass transition temperature and textural properties of freeze-dried trehalose solid and cookie. Journal of Food Engineering, 217, 101-107. doi:10.1016/j.jfoodeng.2017.08.027Telis, V. R. N., & Martínez-Navarrete, N. (2009). Collapse and Color Changes in Grapefruit Juice Powder as Affected by Water Activity, Glass Transition, and Addition of Carbohydrate Polymers. Food Biophysics, 4(2), 83-93. doi:10.1007/s11483-009-9104-0Telis, V. R. N., & Martínez-Navarrete, N. (2010). Application of compression test in analysis of mechanical and color changes in grapefruit juice powder as related to glass transition and water activity. LWT - Food Science and Technology, 43(5), 744-751. doi:10.1016/j.lwt.2009.12.007Wan, J., Ding, Y., Zhou, G., Luo, S., Liu, C., & Liu, F. (2018). Sorption isotherm and state diagram for indica rice starch with and without soluble dietary fiber. Journal of Cereal Science, 80, 44-49. doi:10.1016/j.jcs.2018.01.003Wu, H.-Y., Sun, C.-B., & Liu, N. (2019). Effects of different cryoprotectants on microemulsion freeze-drying. Innovative Food Science & Emerging Technologies, 54, 28-33. doi:10.1016/j.ifset.2018.12.00
Scales for social support for eating habits and exercise: psychometric properties
Fundamentos: El apoyo social puede introducir
cambios favorables en el estilo de vida de cara a reducir el
riesgo cardiovascular. El objetivo de este estudio fue verificar dichos cambios en la población clínica que participó
en el mismo y presentar las propiedades psicométricas de
dos escalas de apoyo social: los hábitos alimentarios y el
ejercicio. Ambas fueron aplicadas en pacientes con síndrome metabólico (SM).
Métodos: Participaron 135 sujetos en un programa
de modificación de estilo de vida. Las medidas sociodemográficas, psicológicas y de estilo de vida fueron tomadas en el Hospital Universitario Virgen de las Nieves
(HUVN) de Granada (España) durante 2013 y 2014. Se
realizaron los siguientes análisis: análisis factorial confirmatorio (AFC), de la consistencia interna, de la sensibilidad al cambio y de la estabilidad temporal.
Resultados: El AFC confirmó la estructura original de
ambas escalas, excepto por la exclusión del factor 2 (familia)
de la escala de apoyo social para el ejercicio. Para la escala
de apoyo social, el ajuste local, todos los ítems presentaron
altos valores de cargas factoriales y fiabilidades individuales (λ≥0,64 y R2≥0,41, respectivamente). Para la escala de
ejercicio, el ajuste local, los ítems presentaron altos valores
de cargas factoriales y fiabilidades individuales (λ≥0,62 y
R2≥0,38, respectivamente). Los valores de consistencia interna resultaron entre adecuados y excelentes, con cifras de
alfa de Cronbach entre 0,714 y 0,864. En cuanto a la sensibilidad al cambio, el grupo experimental aumentó la percepción del apoyo social para la alimentación y para el ejercicio.
El grupo de control no presentó diferencias significativas.
Conclusiones: Los resultados muestran niveles adecuados de validez y fiabilidad, demostrando que las escalas son adecuadas para evaluar el apoyo social en pacientes con SM.Background: Social support can introduce favorable
changes in lifestyle to reduce the cardiovascular risk. The
aim of this study was to verify these changes in the clinical
population participating in this study and present the psychometric properties of the scales of social support for ‘Eating
Habits’ and ‘Exercise’ in patients diagnosed with metabolic
syndrome.
Methods: 135 participants attending a programme for
changing lifestyle habits. Sociodemographic, psychological, and lifestyle variables were assessed at the Hospital
Universitario Virgen de las Nieves (HUVN) in Granada
(Spain) between 2013 and 2014. The following procedures
were used: Confirmatory factor analysis (CFA), internal consistency, sensibility to change and temporal stability.
Results: The AFC confirmed the original structure of
both scales, except for the exclusion of factor 2 (family) from
the social support scale for the year. For the social support
scale, the local adjustment, all items presented high values of
factor loads and individual reliability (λ≥0.64 and R2≥0.41,
respectively). For the exercise scale, the local adjustment,
the items presented high values of factor loads and individual reliability (λ≥0.62 and R2≥0.38, respectively). Internal
consistency values were between adequate and excellent,
with Cronbach’s alpha figures between 0.714 and 0.864.
Regarding sensitivity to change, the experimental group increased the perception of social support for food and exercise. The control group did not show significant differences.
Conclusions: Our results show adequate indices for validity and reliability of the measures. Both measures appeared to be useful to assess social support in patients diagnosed
with metabolic syndrome
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