Commodity-industry classificationproxy: A correspondence table between SITC revision 2 and ISIC revision 3

The correspondence table is one of the important tools in categorizing existing records into different perspective. It helps to understand the pattern of various economic activities from single source of data. Nevertheless, most of the existing correspondence tables have been focusing more on the latest classification and neglect the correspondence for the older version. Since some analysis would require longer series of data, therefore it is necessary to create a correspondence table for the earlier version of classification. This paper devoted to create a correspondence table between SITC Revision 2 and ISIC Revision 3 using a proxy method. The proxy is done using the SITC Rev.2 – SITC Rev.3 correspondence table and the SITC Rev.3 – ISIC Rev.3 correspondence table. This method has capable to directly find an industrial match for more than 98 percent of commodities under SITC Rev.3. For remaining commodities which industrial category cannot be matched directly, the identification was done automatically based on the closest code.Commodity, Industry SITC Rev.2, SITC Rev.3, ISIC Rev.3, correspondence table

Commodity-industry classificationproxy: A correspondence table between SITC revision 2 and ISIC revision 3

The correspondence table is one of the important tools in categorizing existing records into different perspective. It helps to understand the pattern of various economic activities from single source of data. Nevertheless, most of the existing correspondence tables have been focusing more on the latest classification and neglect the correspondence for the older version. Since some analysis would require longer series of data, therefore it is necessary to create a correspondence table for the earlier version of classification. This paper devoted to create a correspondence table between SITC Revision 2 and ISIC Revision 3 using a proxy method. The proxy is done using the SITC Rev.2 – SITC Rev.3 correspondence table and the SITC Rev.3 – ISIC Rev.3 correspondence table. This method has capable to directly find an industrial match for more than 98 percent of commodities under SITC Rev.3. For remaining commodities which industrial category cannot be matched directly, the identification was done automatically based on the closest code

Agentes ligantes e seus efeitos em concretos refratários alumina-magnésia Binders and their effects on alumina-magnesia refratory castables

Concretos refratários alumina-magnésia são comumente ligados por cimentos de aluminato de cálcio. Estes materiais apresentam, em temperaturas elevadas, uma reação de caráter expansivo decorrente da espinelização in-situ (MgAl2O4). Quando ligados por cimentos, reações adicionais (formação de CA2 e CA6) contribuem para a expansão. Uma alternativa para controlar a estabilidade volumétrica é a substituição do cimento tipicamente utilizado (~30%-p CaO) por outro de menor teor de cálcio (~20%-p CaO) ou por alumina hidratável. Tais substituições podem afetar as propriedades dos concretos, como a resistência mecânica a frio, a hidratação da magnésia e as propriedades durante e após a sinterização. Deste modo, o objetivo deste trabalho é avaliar o impacto destes ligantes no processamento de concretos alumina-magnésia. Sendo assim, pretende-se utilizar a fonte de ligante como uma ferramenta para a obtenção de concretos refratários com expansão engenheirada, visando-se aumentar a flexibilidade na seleção de materiais aplicados em panelas de siderurgia.<br>The usual binder of alumina-magnesia castables is the calcium aluminate cement. Due to in-situ spinel (MgAl2O4) formation at high temperatures, these materials present an expansive behavior. When bonded with cement, further reactions (CA2 and CA6 formation) also contribute to the overall expansion. Changing the most common cement used (~ 30 wt.% CaO) for other containing less calcia (~ 20 wt.% CaO) or for hydratable alumina are suitable alternatives for controlling the castables' volumetric stability. Nevertheless, the binder replacement may affect castables properties, such as cold mechanical strength, MgO hydration degree and properties during and after sintering. Therefore, the objective of the present paper is to analyze the effects of these binders on the alumina-magnesia castables processing. As a result, the binder systems can be used as a tool for designing the alumina-magnesia castables expansion, increasing the flexibility on the selection of steel ladles linings