Michael S. Ramsey (Y) 7 Jonathan H. Fink Department of Geology, Arizona State University, Box 871404, Tempe, Arizona 85287–1404, USA Fax: c602 965 1787 e-mail: ramsey6elwood.la.asu.edu Abstract Remote monitoring of active lava domes provides insights into the duration of continued lava extrusion and detection of potentially associated explosive activity. On inactive flows, variations in surface...

Concurrently to research conducted on ordinary Portland cement (PC), new types of binders were developed during the last decades. These are formed by alkali-activation of metakaolin or ground-granulated blast furnace slag (GGBFS) and are named, respectively, geopolymers (GP) or alkali-activated slag (AAS). Four different cementitious materials were synthesised: PC, AAS, GP, and a mix GP-AAS and...

Considering the importance of professional plaque control for caries prevention, this study comprised an in vitro evaluation of wear by two prophylaxis methods (sodium bicarbonate jet - Profident and pumice and brush) on sound bovine enamel and with artificial carious lesions. Sixty enamel fragments were employed (4x4mm), which were divided into 4 groups: GI - 15 sound blocks treated with pumic...

in this study, the removal of as (v) from water resources by using aluminum-coated pumice as a new adsorbent was assessed. the features of the adsorbent coating layer were observed by x-ray diffraction (xrd) and scanning electron microscopy (sem).the effects of various parameters such as adsorbent doses, ph, contact time, arsenate initial concentration and interfering ions in arsenic adsorpt...

in this study, the removal of as (v) from water resources by using aluminum-coated pumice as a new adsorbent was assessed. the features of the adsorbent coating layer were observed by x-ray diffraction (xrd) and scanning electron microscopy (sem).the effects of various parameters such as adsorbent doses, ph, contact time, arsenate initial concentration and interfering ions in arsenic adsorption...

An attractive approach to reduce the carbon dioxide footprint of deep soil mixing (DSM) is replace Portland cement-based binders by geopolymers based on metakaolin. Safe design requires a good understanding mechanical and hydraulic properties improved ground, but very little known about metakaolin–soil mixtures. For instance, shrinkage during curing significant issue for metakaolin-based concre...

denim is a casual garment normally used by young people and extremely influential in shaping the fashion industry. among various garments, these garments are subjected to innovations. this work is an attempt to compare the different methods of stone washing using pumice stones, acid cellulases and neutral cellulases or in combination of these methods. the effects of different processing conditi...

PURPOSE The purpose of this study was to evaluate the effect of material characteristics, preparation techniques, and fissure morphology on the microleakage and penetrability of pit and fissure sealants. METHODS Sealants used in the study included: (1) Aegis; (2) Conseal f; (3) Admira Seal; (4) Triage; and (5) Delton Opaque. A total of 100 extracted permanent molars were randomly assigned to ...

The reutilization of wastewater is a key issue with regard to long-term space missions and planetary habitation. This study reports the design, test runs and microbiological analyses of a fixed bed biofiltration system which applies pumice grain (16-25 mm grain size, 90 m(2)/m(3) active surface) as matrix and calcium carbonate as buffer. For activation, the pumice was inoculated with garden soi...