Against the common perception of sand as an abundant, even inexhaustible material, the idea of a "global sand crisis" has emerged as a public issue over the past decade. A 2014 report published under the patronage of the UNEP, followed by a more comprehensive publication in 2019, has been...

Verlagsinfo: Sand, Eisen, Salz, Öl, Kupfer und Lithium: Diese auf den ersten Blick unscheinbaren, aber magischen Materialien haben über das Schicksal und den Wohlstand von Imperien entschieden, Zivilisationen hervorgebracht und zerstört sowie unsere Gier und unseren Erfindungsreichtum über...

The research setting and conducting research "at home" -- The commodity chain of river sand and the ecological consequences of river-sand mining -- Government policies and the commodification of river sand -- State ownership and the governmental management of river sand -- Zhuang Villages'...

Sand als wichtiger Rohstoff ist durchaus begrenzt und kostbar. Deshalb ist ein umsichtiger und nachhaltiger Umgang mit ihm notwendig. Der Beitrag gibt einen kurzen Überblick über die Auswirkungen des exzessiven Sandabbaus, die von Verlusten bei der Biodiversität über negative Klimafolgen bis...

This paper presents the results of an extensive study of two thermal energy storage (TES) systems. The goal of the research is to make solar energy cost-competitive with other forms of electricity. A small-scale TES system was first built. The inner to outer layers were made of firebrick (FB),...

Singapore industrialised rapidly with continuously high growth rates since its independence in 1965 and its population during the same period of time almost tripled. With development at this scale, Singapore had to grow in number of industrial and residential buildings as well as in size through...

Hydraulic property measurements often rely on non-linear inversion models whose errors vary between samples. In non-linear physical measurement systems, bias can be directly quantified and removed using calibration standards. In hydrologic systems, field calibration is often infeasible and bias...

The purpose of this report was to estimate the cost of producing methane (natural gas) from geopressured aquifers inland from and along the coast of the Gulf of New Mexico. No other economic values of the geopressured brines were considered for exploitation. There were several component tasks of...

Numerical and analytical models of sand and dust particle accumulation on photovoltaic modules in dry regions are presented and supported by a laboratory investigation of sand particle accumulation on a glass surface. Both models and the experimental data indicate that the reduction in the free...

An indirect forced convection solar drier integrated with heat storage material was developed to test its performance for copra drying. The drier consists of a solar flat plate air heater integrated with a sensible heat storage unit, a drying chamber and a centrifugal blower. The experiments...

An indirect forced convection solar drier integrated with heat storage material was developed to test its performance for copra drying. The drier consists of a solar flat plate air heater integrated with a sensible heat storage unit, a drying chamber and a centrifugal blower. The experiments...

The macroscopic volume changes of granular bodies during compression and shearing are investigated in terms of compressible fluid. The proposed analogy between sand body and van der Waals fluid, and appropriate form of van der Waals state equation, is demonstrated interpreting common soil...