Carbon nanotubes (CNTs) and nanofibers (CNFs) were synthesized on clinker and silica fume particles in order to create a low cost cementitious nanostructured material. The synthesis was carried out by an in situ chemical vapor deposition (CVD) process using converter dust, an industrial byproduct, as iron precursor. The use of these materials reduces the cost, with the objective of application ...

Northwest Africa (NWA) 5790 is the most recently discovered member of the nakhlite group. Its mineralogy differs from the other nakhlites with a high abundance mesostasis (38.1 3.6 vol%) and scarcity of olivine (4.0 2.2 vol%). Furthermore, zoning of augite phenocrysts, and other petrographic and chemical characteristics suggest that NWA 5790 samples the chilled margin of its parent lava flow/si...

Co-processing of hazardous wastes in cement kilns have for decades been thought to cause increased emissions of PCDD/PCDFs--a perception that has been evaluated in this study. Hundreds of PCDD/PCDF measurements conducted by the cement industry and others in the last few years, on emissions and solid materials, as well as recent test burns with hazardous wastes in developing countries do not sup...

This note performs a cost-benefit analysis of proposed limit values for the emission of dust from cement kilns that use waste as fuel (currently under discussion between the European Council and the European Parliament as part of the new Directive to regulate the emissions by facilities that incinerate waste). The estimation of benefits is based on the most recent results of the ExternE Project...

Dust is a natural phenomenon, and it represents all the components suspended in air. causes photovoltaic performance to deteriorate. The main dust concentrations vary from one geographic location another season another. These also have different effects on PV power losses. Therefore, studying effect of concentration each component separately can give greater clarification detail how accumulated...