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A selection of dye-sensitized solar cells. A dye-sensitized solar cell (DSSC, DSC, DYSC [1] or Grätzel cell) is a low-cost solar cell belonging to the group of thin film solar cells. [2] It is based on a semiconductor formed between a photo-sensitized anode and an electrolyte, a photoelectrochemical system.
During the operation of the cell, substances, including aluminium and fluorides, are absorbed into the cell lining. After some years of operation, the pot lining fails and is removed. The removed material is spent potlining (SPL). SPL was listed by the United States Environmental Protection Agency in 1988 as a hazardous waste. [1]
At 453 K the equilibrium constant is 7.39 x 10 −5. ΔG calculated at 453 K was 35.833 kJ/mol Using the standard heat of formation and entropy ΔG at room temperature (298 K) came out to be 45.904 kJ/mol On extrapolation to 1023 K, ΔG is -1.229 kJ/mol On substitution, K eq at 1023 K is 1.44 x 10 −4.
Angle of repose of a heap of sand Sandpile from the Matemateca collection. The angle of repose, or critical angle of repose, [1] of a granular material is the steepest angle of descent or dip relative to the horizontal plane on which the material can be piled without slumping. At this angle, the material on the slope face is on the verge of ...
[3] [4] The compound β-alumina was already discovered in 1916 and the structure was quite well known by the end of the 1930s. The term "beta-alumina" is a misnomer, [5] since it is not an aluminium oxide (Al 2 O 3), but a sodium polyaluminate. Before the 1970s, β-alumina was mainly used in the construction of industrial furnaces.
[5] [6] The US Army Corps of Engineers in Vicksburg, Mississippi (1981) experimented with a number of confining systems, from plastic pipe mats, to slotted aluminum sheets to prefabricated polymeric systems called sand grids and then, cellular confinement systems. Today cellular confinement systems are typically made from strips 50–200 mm ...
PLate OPtimizer, or PLOP is a CAD program used by amateur telescope makers to design primary mirror support cells for reflecting telescopes.It was developed by telescope maker David Lewis, first described in 1999, [1] and used to simplify calculations needed in the design of mirror support cells. [2]
The shape of the honeycomb cell is often varied to meet different engineering applications. Shapes that are commonly used besides the regular hexagonal cell include triangular cells, square cells, and circular-cored hexagonal cells, and circular-cored square cells. [32] The relative densities of these cells will depend on their new geometry.
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