Te-rich Ge-Te-Se glass for the CO2 infrared detection at 15 μm

Te80-xGe20Sex glasses have been prepared along the GeSe4-GeTe4 axis using the classical method in silica tube under vacuum. A phase separation domain appears for composition around Te40Ge20Se40. Our attention was turned toward the Te-rich compositions corresponding to 1 < x < 5 at.%. These glasses are transparent from 4 to about 20 μm without...

Silica sand resources in the Netherlands

Silica sand, (almost) pure quartz sand, is a valuable and scarce mineral resource within the shallow Dutch subsurface. High-grade deposits are exploited in the southeastemmost part of the country, as raw material for the glass, ceramic, chemical and other process industries. Dutch land-use policy requires that scarce mineral resources (including...

Developing a silicagel-water adsorption chiller for micro-trigeneration

Recently small-scale thermally driven chillers have gained a lot of interest because their potential to save primary energy, to reduce electricity peaks on the grids and to improve cost benefit ratio of micro-CHP units when combined into tri-generation systems. ECN has developed a small-scale (output < 5 kW) silicagel-water adsoprtion chiller...

Hollow fibre microporous silica membranes for gas separation and pervaporation: Synthesis, performance and stability

Thin microporous silica membranes were prepared on the outer surface of hollow fibre ceramic substrates. In principle this enables relatively fast and inexpensive production of large membrane surface area, combined with a low support resistance and a high membrane surface area/module volume ratio (>1000 m2 m-3) compared to tubular membranes....

Risk assessment of silicosis and lung cancer among construction workers exposed to respirable quartz

Objectives: The aim of this study was to assess the magnitude of the silicosis and cancer risk among construction workers. Methods: In 1998, 1335 of 4173 invited construction workers with expected high cumulative exposure to quartz were studied for early signs of silicosis. In 2002 the study was repeated for 96 persons. Exposure measurements...

Construction raw materials policy and supply practices in Northwestern Europe

The present contribution is an inventory of the construction raw materials policy and supply practices in The Netherlands, Belgium, North Rhine-Westphalia, Lower Saxony, Great Britain, Norway and Denmark. The work has been commissioned by the Dutch government in order to benchmark its domestic provision and the governing mineral planning policy....

Methods of testing alkali-silica reactivity in The Netherlands

In the current Dutch standard NEN 5905 and CUR Recommendation 38, four methods are listed for assessing the alkali-silica reactivity of concrete aggregates. However, procedures outlining how the tests should be performed, and the possible errors associated with such tests, are not given. This makes interpretation of results obtained by any of...

Submicroporous and macroporous silica