Estudio comparativo de las propiedades magnéticas de ferritas hexagonales de Bario obtenidas por los métodos de coprecipitación y microemulsión

Por el m todo de coprecipitaci n qu mica se obtuvo un precursor formado por hidr xidos y carbonatos de hierro y bario que al calcinarlo a temperaturas superiores a 730oC se transforma en ferrita de bario. Al calcinar el precursor durante 2 horas se obtuvo la magnetizaci n m xima de 59.1 emu/g para la temperatura de 925oC. Por el m todo de microemulsi n se obtuvo un precursor fino de hidr xidos y carbonatos de hierro y bario que al calcinarlo a temperaturas superiores a 760oC se transforma en ferrita de bario. Al calcinar el precursor durante 12 horas se obtuvo la magnetizaci n m xima de 60.5 emu/g para la temperatura de 925oC. La coercitividad intr nseca del polvo de ferrita de bario obtenido por microemulsi n result ser un 20% menor que la coercitividad intr nseca del polvo de ferrita de bario obtenido por coprecipitaci n. Esta menor coercitividad debe favorecer al m todo de microemulsi n para la producci n de part culas de ferrita de bario que sirvan como medio de grabaci n magn tica perpendicular.Peer reviewe

Antioxidant properties of rice bran oil from different varieties extracted by solvent extraction methods

Antioxidant properties of rice bran oil from different rice bran varieties; Rice Bran-Bario (RB-Bario), Rice bran-Lowland (RB-Low) and Rice Bran- Upland rice (RB-Up), collected from different cultural plots, were assessed. Measurement of antioxidant properties was evaluated by TPC (total phenolic content), DPPH scavenging activities and reducing power of extracts.. The study shows that antioxidant efficacy of rice bran was found the highest in RB-Up, followed by RB- Low and RB-Bario. The antioxidant properties were related to the rice bran origin and water irrigation demand by particular variety. RB –Up has a unique plantation condition which takes least amount of water retention which contribute to the highest antioxidant activity. Extraction solvents used shows that Upland (16.15%) and Lowland (16.16%) yielded the highest amount in conserving the crude fat oil in rice bran extract compared to Bario

The Diary of a District Officer: Alastair Morrison\u27s 1953 Trip to the Kelabit Highlands

In 1953, Alastair Morrison, then acting District Officer for the Bara, traveled to the Kelabit Highlands along with his wife, photographer Hedda Morrison, and ever changing entourage of \u27coolie porters and guides. This journey was part of his regular responsibilities as a District Officer. During such tours, Morrison surveyed longhouse communities and collected information about the local population and spoke to people about government policies, school fees, taxes, the registering of guns, and often sought to resolve local disputes. Such journeys were summarized in formal reports. However, Morrison also kept travel notebooks, which he later used to write his memoir, which summarized the highlights of his life in Sarawak (Morrison 1993). These handwritten travel notebooks from his journeys are preserved, along with his wife\u27s photographs, in the Kroch Rare Book and Manuscript Collection at Cornell University. This article is based on a close reading of Morrison\u27s Kelabit notebooks, where he recorded his daily thoughts during a one month trip on food through the Kelabit Highlands in 1953. Whereas Morrison\u27s published memoir (1993: 86-88) summaries in just over two pages the main issues encountered on the journey, the original notebooks provide much additional information

Selective Participation – The Disempowerment amongst Bario Youth in Sarawak Malaysia

Participation is one part of an element of the empowerment; with it a person can control their capitals to gain their needs without depending outsiders. However, in reality, the issues concerned by public are always about the lacking of participation of youth in a local organization. Without participation, a youth will be in the state of disempowerment. To be more specific, this article listed out three research objectives; to describe the Bario youth’s participation in community organizations; to identify the factors of youth’s participations; to identify a barriers faced by Bario youths to participate in organization. This research studied on those issues encountered among Bario youth in Sarawak. This study was conducted through a survey research framework and the samples were chose by convenience sampling. The data were analyzed by descriptive statistic; the percentages and mean presenting the data. The result showed that, Bario youths were not participated in the local organization, especially when the organizations were dominated by other groups of age. They were participated in the organization by which they are free to make a decision on behalf of their affairs. The barrier is, the other group ages did not give chances to them in contributing their efforts to the organization. By considering those realities, researchers decided that Bario youths were disempowerment. Keywords: Participation, barriers of participation, empowerment, disempowerment

Síntesis por reacción en estado sólido de un apatito de bario

Se estudia la síntesis de un apatito de bario por reacción en estado sólido entre fosfato amónico dibásico y carbonato de bario. La fase obtenida a diferentes temperaturas y tiempos de calefacción se ha estudiado mediante difracción de rayos X y espectrografía de infrarrojos. Además, se han calculado los valores de los parámetros a y c como verificación de tal obtención

Effect of parboiling on in vitro physiological antioxidant capacity of brown rice

Parboiling process has been widely implemented in brown rice processing, but its effect on in vitro physiological antioxidant capacity of brown rice was not known. In this study, an in vitro method simulating the human physiological conditions was used to investigate the effect of parboiling on antioxidant capacity of brown rice in three Bario rice varieties. In this method, bacterial inocula were prepared from rat cecal contents. Results showed that parboiling process gave significant impacts on in vitro physiological antioxidant capacity of brown rice. The process improved total phenolic content at small intestine (Adan Halus), DPPH scavenging activity at both small and large intestines (Adan Halus and Bario Merah) and ferrous ion-chelating activity at large intestine (Bario Hitam). However, changes in antioxidant capacity were variety dependent, possibly due to different bran pigmentation. These suggested that parboiling process could improve physiological antioxidant capacity with in vitro simulation at small and large intestines by selecting a suitable rice variety and parboiled brown rice could offer good antioxidant properties to maintain physiological health

Design and Chemical Synthesis of Fluorescent Bicolor Indicators for the Detection of Neutrinoless Double Beta Decay of 136Xe

223 p.La observación de la desintegración beta doble sin neutrinos (¿¿¿¿) demostraría que el neutrino es una partícula de Majorana, es decir, su propia antipartícula. Este proceso de desintegración sólo es posible en algunos isótopos de la tabla periódica. Uno de ellos es el 136-Xe, que tras este proceso da lugar a un catión de bario. Debido a la naturaleza inusual de este evento, la detección de este catión de bario requiere un indicador fluorescente sensible y selectivo que genere una señal clara con respecto al ruido de fondo. En este contexto, en esta Tesis se descibe el proceso de diseño y síntesis de un indicador bicolor fluorescente altamente sensible y capaz de trabajar en fase gas, que exhibe diferentes longitudes de onda de emisión cuando está en su estado libre no coordinado y después de capturar un catión de bario. Además, se lleva a cabo una caracterización fotofísica completa para estos sensores. La química computacional también se refleja en distintos puntos, apoyando los resultados experimentales. Por último, se inicia el estudio de los mismos sobre distintas superficies. Llevando a cabo distintas reacciones orgánicas y experimentos fotofísicos

Characterisation of Bario Rice Flour Varieties: Nutritional Compositions and Physicochemical Properties

Gluten-free grains have been intensively studied as alternatives to wheat flour. Bario rice, an indigenous crop from Sarawak, Malaysia, is noted for its excellent aroma and taste. This research examined the nutritional and physicochemical properties of Bario rice flour variations. Four Bario varieties-Bario Adan Halus (white), Bario Tuan (brown), Bario Celum (black), and Bario Merah Sederhana (red)-were analysed against the reference sample. The results revealed Bario samples containing moisture contents from 8.35% to 8.69%, ash contents from 0.27% to 1.25%, crude protein contents from 6.89% to 9.43%, crude fat contents from 0.16% to 2.45%, crude fibre contents from 0.21% to 0.87%, and carbohydrate contents from 79.17% to 82.13%. All Bario rice flour contains high amylose contents (26.67% to 36.52%), which positively impact loaf volume. The water absorption capacity (1.20 g/g to 1.26 g/g) of all samples shows no significant difference (p > 0.05). The swelling capacity was significantly (p < 0.05) high in non-pigmented rice flour. In contrast, pigmented Bario rice flour presented a greater water solubility index than non-pigmented Bario rice flour. The Bario rice flour gelatinisation onset (71.43 °C to 76.49 °C) and peak (77.03 °C to 79.56 °C) temperature were lower than those of the control sample. Higher gelatinisation enthalpy was presented by Bario rice flour (1.23 J/g to 2.59 J/g) than by the control (0.79 J/g). Retrogradation onset (42.65 °C to 50.79 °C), peak (53.64 °C to 56.15 °C) temperatures, and enthalpy (0.19 J/g to 0.87 J/g) were greater in Bario rice flour compared with those in the control. The research suggests that Bario rice flour has potential for use in gluten-free bread mainly due to the relevant carbohydrates, crude proteins, amylose, and swelling capacity