OBJECTIVES Cement contains hexavalent chromium, which is a human carcinogen. However, its effect on cancer seems inconclusive in epidemiologic studies. The aim of this retrospective cohort study was to elucidate the association between dust exposure in the cement industry and cancer occurrence. METHODS The cohorts consisted of male workers in 6 Portland cement factories in Korea. Study subjec...

In this study the effect of human urine on lithobiontic microorganisms colonizing dolostones from a historic quarry (Redueña, Madrid, Spain) was evaluated in situ by means of a field experiment. The application of the bioproduct was performed by directly spraying onto the rock surface of the quarry front during 8 weeks. After the treatment, the ultrastructure of Verrucaria nigrescens was analys...

The Upper Triassic Snyder quarry is the second-most productive theropod locality in the Chinle Group. Skull and postcranialelements, particularly tibiae, collected from the Snyder quarry during the last three field seasons demonstrate the presence of at least four individuals of two taxa. The smaller theropod strongly resembles, but is distinct from, the holotype of Eucoelophysis baldwini Sulli...

A study of the bond characteristics of carbonate aggregates was made by applyirig shear stresses to 1/8-inch thick slices of highway concrete. It was found that aggregates can be classified as strong, indeterminate, and weak relative to the matrix of the concrete, when accurate lithological cataloging of the aggregates from the source quarry section is made prior to the shear study. Definite cl...

introduction thermal infrared integrated dust index (tiidi) is one of indices that is presented in this direction. the index operates based on four brightness temperature difference including wavelengths 3.7, 8.6, 11 and 12 micrometer. according to the studies, btd (bt12-bt11) is used for cloud detection. btd (bt8.6-bt11) is the index for separation for dust from sandy surface and btd (bt3.7-bt...

Abstract In this study, variable returns to scale (VRS) data envelopment analysis was integrated into the Taguchi approach optimize ternary additives for expansive soil enhancement. The selected were sawdust ash (SDA), quarry dust (QD) and ordinary Portland cement (OPC). set as input variables while multiple responses obtained from experiments performed with orthogonal array output variables. E...

The effect of quarry activities on some morphological parameters two maize varieties (swan 1 and sammaz 52) was investigated with the aim determining impact growth under study. seeds were collected from Seed Bank Department Ondo State Ministry Agriculture, Akure, State. They authenticated at Herbarium unit Federal University Technology, voucher deposited. Soil samples 50m, 100m, 150m, 200m, 250...

The utilization of waste materials in concrete is now a widely used concept that counteracts the depletion natural resources. In addition to this, it will untangle disposal nature and find an alternative approach shelter environmental Due rapid growth industrialization, management has become increasingly challenging recent years. Several could be whole or part replace cement aggregates. main di...

This paper studies how the activity of hydraulic excavators found in Rosia quarry Jiu affects environment. For this study we chose Caterpillar 323D L and 323 D LN excavators. The took place over a period 30 days. These days have collected data on noise level PM 10 particles quarry. equipment not only helps to build better world, but also preserve environment, which is so fragile today. evolutio...