Based on the recent literature of heterogeneous firms, productive firms self select themselves into foreign markets. In this framework, there is a productivity rise prior to exporting. On the other words, different export performance across firms is linked to their heterogeneity.   The main purpose of the present paper is to examine the so-called hypothesis of heterogeneous firm in Iran. For ...

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In this paper, we investigate compactly supported symmetric orthonormal dyadic complex wavelets such that the symmetric orthonormal refinable functions have high linear-phase moments and the antisymmetric wavelets have high vanishing moments. Such wavelets naturally lead to real-valued symmetric tight wavelet frames with some desirable moment properties, and are related to coiflets which are re...

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In protection experiments (5-formyltetrahydrofolate or 5-methyltetrahydrofolate added to cultures in vitro at the same time as methotrexate), 5-methyltetrahydrofolate af forded the same degree of protection as did formyltetrahydrofolate for phytohemagglutinin-stimulated peripheral blood lymphocytes and for methotrexate-resistant (R) and methotrexate-sensitive (S) sublines of CCRF-CEM. Either re...