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Thermal characterization of lignite, crude oils and their 10 and 20% mixtures were investigated by differential scanning calorimetry (d.s.c.). The calorific value of the lignite increased in mixtures depending on the crude oil type. In pyrolysis runs, temperature ranges where distillation and visbreaking occur were identified for the crude oils studied. The effect of heating rate was also studied, Barbour Femme Ebay and higher reaction temperatures and higher heat flow rates were observed at d.s.c. peak thermograms with increasing heating rate (5, 10, 15, 20 and 25 °C min−1). The specific heat of samples was examined in the temperature range 20–600 °C, and showed an increase with increasing temperature until the decomposition temperature was reached. Kinetic parameters of the samples were investigated and an increase was observed in the activation energy Barbour Soldes and Arrhenius constant of the mixtures.
Prior research suggests that firms create breakthrough innovations by using external knowledge, but it also underscores the difficulties firms face in acquiring and applying external knowledge. In this paper, we combine these insights to examine the conditions under which external knowledge usage will either enhance or erode firm performance. In particular, we argue that high external knowledge usage has a negative effect on performance when firms enter multiple new product markets, but a positive effect Barbour Vente En Ligne on performance when firms using external knowledge have higher absorptive capacity. We find general support for our hypotheses, which we test using patent citation data from the global integrated circuit manufacturing industry. Our findings have important implications for managers of firms making strategic decisions about their firms’ product portfolios and the degree to which they use external knowledge.
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