40 research outputs found

    ICAR: endoscopic skull鈥恇ase surgery

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    Setting time: An important criterion to determine the length of the delay period before steam curing of concrete

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    Some precast concrete plants expose freshly made concrete elements to steam curing immediately after casting. This is detrimental to properties of the product; therefore, some delay prior to the steam curing process is beneficial. This paper contains the results of an investigation on the effects of various delay intervals selected based on initial setting time of concrete. Four different delay periods and two different steam curing periods at 80 degreesC (5 and 10 h) were used with two concrete types, namely C25 and C40. Compressive strength tests were performed at 1, 3, 7, 28, and 90 days. Setting time of the concrete was found to be an important criterion to determine the length of the delay periods

    Effects of macroeconomic variables on Istanbul stock exchange indexes

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    Price volatility spillovers in ISE indexes were analysed based on monthly data from January 1991 to January 2004 for exchange rate, interest rate, inflation, industrial production and M1 money supply. The Exponential Generalized Autoregressive Conditional Heteroscedasticity model was used to test univariate volatility spillovers for macroeconomic variables. It was found that there exists unidirectional strong volatility spillover from inflation, interest rate to all stock price indexes. There are spillovers from M1 money supply to financial index, and from exchange rate to both IMKB 100 and industrial indexes. There is no volatility spillover from industrial production to any index.
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