Employees of coal-fired power stations and people living nearby as well as those involved in the shipment and processing of coal fly ash can be exposed to coal fly ash (pulverised fuel ash or “PFA”). An extensive research program was carried out in order to map such exposure and its effects. Particle size distribution, chemical composition, quartz, radioactivity, emission factors and fugitive d...

Copper-exchanged zeolites of different topologies possess high activity in the direct conversion methane to methanol via chemical looping approach. Despite a large number studies, identification active sites, and especially their intrinsic kinetic characteristics remain incomplete ambiguous. In present work, we collate behavior copper species with spectroscopic identities track evolution variou...

Received (Primljeno): 2012-02-22 Accepted (Prihvaćeno): 2012-05-28 Original scientific paper Zero-emission coal (ZEC) technology has been actively studied recently. It aims to achieve zero emission of CO2 and other pollutants and the efficiency of this system can reach no less than 70%. Hydro-gasification of pulverized coal is a core process of ZEC. However, the mechanism of gasification and tr...

large reserves of coal in tabas region of iran are characterized by low ash and high caking index, suitable for use in metallurgy as coking coal. however, these coals cannot be gainfully utilized because of their high sulfur content. in this work, studies on desulfurization of tabas coals were carried out in a batch reactor using various reagents. the most effective reagents, fe2(so4)3 , fecl3 ...

En este trabajo se estudia la oxidación de un gas pirólisis utilizando distintos transportadores oxígeno a distintas temperaturas, mediante tecnología Chemical Looping Combustion (CLC).

Chemical Looping with Oxygen Uncoupling (CLOU) is a technological adaptation of CLC, most applicable for the combustion solid fuels. In CLOU process, an oxygen carrier in fuel reactor, avoiding direct contact air, releases needed combustion. The regenerated air interconnected reactor. present work explores behavior system Mn/Mg/Si as carriers chemical-looping uncoupling (CLOU). Six different mi...

DNA looping mediated by transcription factors plays critical roles in prokaryotic gene regulation. The "genetic switch" of bacteriophage λ determines whether a prophage stays incorporated in the E. coli chromosome or enters the lytic cycle of phage propagation and cell lysis. Past studies have shown that long-range DNA interactions between the operator sequences O(R) and O(L) (separated by 2.3 ...

Any trajectory of a diffusing particle making a transition between two end points of an interval can be divided into two segments, which we call direct-transit and looping parts. The former is the final segment of the trajectory, when the particle goes from one end point of the interval to the opposite end point, without retouching the starting point. The rest of the trajectory is the looping p...