다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

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Qualitative Research in Information Systems

Antioxidants are components which prevent auto-oxidation of oils and fats by giving their hydrogen to free radicals formed in the initiation and propagation stages of autoxidation. During the past two decades, a lot of researches using natural plants extract in edible oils have been carried out due to the trend to minimize or avoid the use of synthetic food additives. According to the most studies, there are various natural antioxidants which can be extracted from low cost resources, such as most parts of olive plant, green tea, sesame, medicinal plants, etc. One of the most important requirements for a suitable antioxidant in oils and fats is the thermal stability during heat processing. It has been shown that most of natural additives have more antioxidants activity and thermal stability than synthetic ones in different edible oils. In this review, recent advances in the application of natural antioxidants in the food industry will be covered.

Application and stability of natural antioxidants in edible oils in order to substitute synthetic additives

Information politics

A comprehensive review on the environmental impacts of diesel/biodiesel additives

Commercial antioxidants and thermal stability evaluations

The use of SrSnO3 as a photocatalyst in different applications has been growing in recent years, particularly for degradation of organic dyes. In the present work, SrSnO3 catalyst was synthesized by the modified Pechini method and applied in the photocatalytic degradation of a textile azo-dye in aqueous solution under ultraviolet irradiation. The dominant photocatalytic species for this system were evaluated, determined from terephthalic acid photohydroxylation and from different scavengers. Moreover, electrochemical data were used to evaluate charge transfer between SrSnO3 and the species involved in the photocatalysis – O2, H2O and the scavengers. The irradiation time required to achieve 98% decolorization of a Remazol Golden Yellow (RNL) solution was 10 h. The catalyst simultaneously reduced all the absorption bands in the UV–vis spectrum of RNL, suggesting pollutant degradation. Isopropanol, silver and formic acid were all employed to test the importance of different photocatalytic processes and the photohydroxylation of terephthalic acid confirmed the generation of OH. A comparison of the SrSnO3 band positions and the potential of relevant redox couples suggests possible mechanisms for OH generation from both photogenerated carrier types (electrons and holes), in agreement with the results obtained using the hole/electron scavengers.

SrSnO3 perovskite obtained by the modified Pechini method—Insights about its photocatalytic activity

Evaluation of the oxidative stability and flow properties of quaternary mixtures of vegetable oils for biodiesel production

Information Systems (IS) is a field of study concerned with a large range of multifaceted issues regarding the development, use and implications of information and communication technologies in organizations. It is a recent field of study, yet not well understood by academics and professionals of other areas, even in the fields related to IS such as management and operational research. In this work written for academics and professional, an attempt is made to present some thematic areas of IS, theoretical foundations and some methodological and institutional characteristics. Information Systems is a fragmented field that does not use the methodological rigor usually associated with other scientific disciplines, but has given origin to an impressive wealth of knowledge in the organizational level.

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Sistema de Informação: que ciência é essa?

A proposta deste estudo e analisar os fatores de satisfacao no trabalho dos enfermeiros de hospitais e centros de saude da cidade de Joao Pessoa. Para coleta de dados utilizou-se um questionario com uma escala similar a de Likert. A analise fatorial foi utilizada para identificar alguns fatores, que foram denominados de autonomia com integracao social, reconhecimento da importância do trabalho, pagamento, politica organizacional, relacao administracao-enfermagem e trabalho em si. Em geral, concluise que ha uma forte tendencia a insatisfacao no trabalho dos enfermeiros provocados pela ausencia de fatores higienicos e motivacionais identificados.

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José Rodrigues Filho

Papers

Commercial antioxidants and thermal stability evaluations

SrSnO3 perovskite obtained by the modified Pechini method—Insights about its photocatalytic activity

Evaluation of the oxidative stability and flow properties of quaternary mixtures of vegetable oils for biodiesel production

Sistema de Informação: que ciência é essa?

Enfermagem: fatores de satisfação