Excitons and Trions in Semiconductor Quantum Dots
During the optical excitation of carriers in a semiconductor, the minimum energy re‐ quired to form free carriers is called the band gap. The energy below that value cannot excite…
Chartering
Chartering is an activity within the shipping industry. In some cases a charterer may own cargo and employ a shipbroker to find a ship to deliver the cargo for a certain price, called freight rate. Freight…
Theory of Excitons and Excitonic Quasimolecules Formed from Spatially Separated Electrons and Holes in Quasi-Zero-Dimensional Nanostructures
Quasi-zero-dimensional semiconductor nanosystems consisting of spherical semiconductor nanocrystals, i.e., quantum dots with radii of a =1-10 nm and containing cadmium sulphide and selenide, gallium arsenide, germanium, silicon, and zinc selenide in their…
List of Boiler Mounting Valves and Gauges
To provide for intelligent and safe operation of a boiler, a full complement of gauges and safety devices should be provided. These include: ● Water gauge (water level indicator) ● Pressure gauges.…
Fusible plug
The function of the fusible plug is to put-off the fire in the furnace of the boiler when the water level falls below an unsafe level and thus avoid the…
High Steam and Low Water Safety Valve
This valve has a combined safety arrangement against a) high steam pressure in the boiler and b) low water level in the boiler. A commonly used high steam low water…
Lever safety valve
The advantage of level safety valve over the dead weight safety valve is that the heavy dead weight is replaced by a lever with a smaller weight. Description of Lever…
Spring loaded safety valve (Ramsbotom Safety Valve)
Description of spring loaded safety valve: It is loaded with a spring instead of weights. Hence it is called spring loaded safety valve. It consists of a cast iron body…
Safety valves
Safety valves are devices used to maintain a constant safe pressure inside the boiler. When the pressure inside the boiler increases, the excess steam will escape to the atmosphere through…
Water gauge or Water Level Indicator
Water gauge indicates the water level inside the boiler and is hence called as water level indicator. Usually two water gauges are fitted in front of boiler. Description of water…
