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Abstract  

Angra dos Reis/Itaguai region of the state of Rio de Janeiro, Brazil, is a very problematic area due to the instability of slope and landslides, due to geological and geomorphological conditions and to the significant and continuous human occupation over favorable areas is prone to the triggering of landslides. The samples were analyzed by thermogravimetry (TG), derivative thermogravimetry (DTG) and differential thermal analysis (DTA). This paper analyzes and characterizes the clay minerals and presence of water, gravitational mass movements’ sites and compares it with sites where gravitational mass movements do not occur. Indeed, this analysis also attempts to verify the presence of minerals.

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least squares (OLS), fixed effects panel and first-differences general method of moment (GMM) model tests were executed in EViews on a dataset for 25 EU countries covering 1996–2017. The research question was as follows: Do the various appropriations (i

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Burnside, C. — Eichenbaum, M. (1996): Small-Sample Properties of GMM-Based Wald Tests. Journal of Business and Economic Statistics , 14: 294–308. Eichenbaum M

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): How to do Xtabond2: An Introduction to Difference and System GMM inStata. The Stata Journal, 9 ( 1 ): 86 – 136 . Shahzad , S. J. H. – Zakaria , M. – Rehman , M. U. – Ahmed

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Solution to the Problem of Too Many Instruments in Dynamic Panel Data GMM . Bundesbank Series 1 Discussion Paper , No. 2009, 31 . Mink , M. – de Haan , J. ( 2006 ): Are There

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error terms In corporate governance studies, the most popular regression technique is the pooled OLS model; but in this actual study, only two kinds of regression models are used: fixed effetcs panel-regressions with year dummies, and GMM-type dynamic

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To investigate investment behaviour the present study applies panel data techniques, in particular the Arellano-Bond (1991) GMM estimator, based on data on Estonian manufacturing firms from the period 1995-1999. We employ the model of optimal capital accumulation in the presence of convex adjustment costs. The main research findings are that domestic companies seem to be financially more constrained than those where foreign investors are present, and also, smaller firms are more constrained than their larger counterparts.

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This study examines the relationship between terrorism and economic openness that takes into account both the number and intensity of terrorist incidents and the impact of government military expenditures on trade-GDP and foreign direct investment-GDP ratios for both developed and developing countries. It uses the dynamic GMM method to account for endogeneity in the variables. Deaths caused by terrorism have a significant negative impact on FDI flows, and the number of terrorist attacks is also found to be significant in hampering the countries’ ability to trade with other nations. The study also demonstrates that the developing countries exhibit almost similar results to our main analysis. The developed countries exhibit a negative impact of terrorism, but the regression results are not significant.

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Abstract  

To study the spatial distribution of gold and other elements in various specimens, a method of neutron activation radiography has been elaborated based on irradiating the sample studied with neutrons followed by photoregistration of the induced activity of the element under examination. The main factors, such as the resolution, detection limit, as well as the optimal conditions of irradiation, exposure and photoexposure for obtaining the selective radiographs have been evaluated. Radiographic methods with a resolution of 1–100 m for studying the distribution of more than 30 elements having local detection limits of 10–3–10–8 g·mm–2 have also been developed. Representative data on the regularities of element distribution in minerals and samples of ores and holding rocks were obtained by applying these methods to the analysis of geological and geochemical specimens.

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This paper uses the Jones (1995) framework to examine the contribution of imitation activities and innovative research effort on productivity growth for the US and some European leading economies. We carry out a comparative analysis for the last 50 years, with two model specifications, assuming country differences in the parameters associated with R&D effort. In the first one, the technological frontier position is determined by the country with the highest productivity, the United States. Alternatively, in the second specification, we alter the definition of the technological frontier, allowing it to transcend the leader. The empirical analysis leads to very different outcomes. The first specification estimation, using GMM techniques, indicates that American researchers are more technology growth enhancing than their European counterparts. In contrast, the results obtained for the second, using Kalman’s filter, show that when using an alternative definition of technological frontier, it is possible to observe a boost in innovation that reduces the dispersion among countries. Then, the leading European countries can take advantage; in this case, Germany exhibits the best performance, followed by the US.

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