A near-surface layer of vesicles may be found in many dryland soils, often below a stony desert pavement During and after rain the uppermost part of the regolith develops a surface seal, trapping air which is eompressed and which may also subsequently expand as a result of solar heating. This results in the deformation of the soft regolith and the formation of a vesicular layer just helow the s...

Between November 1988 and July 1992 70 patients with radiolucent gall stones were treated with extracorporeal lithotripsy (ESL) and ursodeoxycholic acid (UDCA; mean (SD) dose 11.2 (1.9) mg/kg/day). Fifty three patients have been followed for one year. One week after lithotripsy, 30.6% had completely eliminated all stone fragments from the gall bladder and one year later 93.9% were free of stone...

This study was designed to assess the impact of high particulate concentration on peak expiratory flow rate of lungs of sand stone quarry workers. The workers were engaged in different types of activities such as drilling, loading and dressing. These different working conditions had different concentrations of RSPM, leading to different exposure levels in workers. It was found that exposure dur...

This research assesses the viability of utilizing construction and demolition waste (CDW) for production environmentally-friendly bricks. The methodology employed in this study consists three main components: An analytical evaluative investigation CDW, selection appropriate materials, determination suitable proportions. experimental groups were prepared using a volumetric approach, namely Type ...

?None of the filters charged with the pulverulent or fibrous niedia, until lately so universally in use, afford the least protection against the passage of the causative agents of enteric fever or cholera; but, on the other hand, these filters are likely to prove sources of danger as secondary means of contaminating pure Water. Differences in the rapidity of transmission of bacteria Were notice...

After several visits to the area rock workings were found on the southern slope of a high dolerite ridge known locally as "Billy Blue". They were ona large sand-stone rock measuring approximately sixty yards long and four yards wide. It faced west and was on the eastern bank of a creek bed which, though normally dry, has a permanent soakage at its mouth some fifty yards below the carved rock. A...

Several sources of evidence, including investigations of pathogenesis and observational studies, support the hypothesis that environmental agents may have an etiologic role in idiopathic pulmonary fibrosis (IPF). Since 1990, six case-control studies have been conducted in three countries and have consistently demonstrated increased risk of IPF with exposures to a number of environmental and occ...

Despite its economic importance, quarrying activity for the production of natural aggregates (sand, gravel, and crushed stone) can result in overexploitation of the natural environment. This paper investigates the current state of natural and recycled aggregates in Sardinia Italy and how to limit the production of natural aggregates (NA) and increase the use of recycled aggregates (RA). The mun...