The direct conversion of methane to C2 hydrocarbons, in a quartz tube reactor enforced by a DC corona discharge, was investigated at atmospheric pressure. The process was carried out in the presence of metal oxide catalysts of Mn/W/SiO2, Mn/W/SiO2 (tetraethyl orthosilicate, TEOS), and Mn/W/CNT (supported on carbon nanotubes). The total yield to C2 hydrocarbons in the presence of metal oxide cat...

DHA-256 (Double Hash Algorithm) was proposed at the Cryptographic Hash Workshop hosted by NIST in November 2005. DHA-256 is a dedicated hash function with output length of 256 bits and 64 steps of operations designed to enhance SHA-256 security. In this paper, we show an attack on 35-step DHA-256. The attack finds pseudo-preimage and preimage of 35-step DHA-256 with the time complexity of 2 and...

the complexes of mn(oac)3 and/or mn(acac)3 with nucleic bases and nucleosides (adenine, guanine, xanthine, adenosine and guanosine) have been synthesized in nonaqueous solution. polarographic and spectroscopic (ir and visible) methods have been used to establish the active site(s) on the imidazole and pyrimidine rings in the nucleic bases and nucleosides for the interaction with the mn(iii) com...

BACKGROUND Micronutrient inadequate intake is responsible of pathological deficiencies and there is a need of assessing the effectiveness of metal supplementation, frequently proposed to rebalance poor diets. Manganese (Mn) is present in many enzymatic intracellular systems crucial for the regulation of cell metabolism, and is contained in commercially available metal supplements. METHODS We ...

INTRODUCTION: The heavy training load in extreme climatic conditions of the European North inevitably requires adaptive reactions from athlete’s body, consequently, influencing on functional performance central nervous system. OBJECTIVE: To identify patterns seasonal changes bioelectric activity and cerebral hemodynamics skiers military age. MATERIALS AND METHODS: study involved 20 was conducte...

Films of cerium-doped LaMnO3, which has been intensively discussed as an electron-doped counterpart to hole-doped mixed-valence lanthanum manganites during the past decade, were analyzed by x-ray photoemission spectroscopy with respect to their manganese valence under photoexcitation. The comparative analysis of the Mn 3s exchange splitting of La0.7Ce0.3MnO3 (LCeMO) films in the dark and under ...