Monthly Archives: March 2010

Google Chrome making it harder to delete browsing history

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Corporate Finance key terms

Chapter 5 Opportunity Cost: the cost of the next best alternative Sunk Cost: cost that has already occurred and cannot be recovered (1+nominal rate) = (1+real rate)(1+inflation rate) Methods for computing operating cash flow Bottom-up approach Works only when there … Continue reading

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Marketing and Finance terms

3 Cs – company customer, competition 3Ps – price, product, promotion, place (distribution) Bull market – upward market in which +20% or more in 2 months or longer. Rally – small moves upward in a shorter period of time Bear … Continue reading

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Scanning Tunneling Microscopy

A conducting tip is brought very cloes to the surface, and a voltage is applied which causes electrons to tunnel through the vacuum. The current is a function of tip position, applied voltage, and the local density of states in … Continue reading

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Actuation methods

1. Shape-memory alloys are metals that can return to their original cold shape after being deformed. After surpassing the transition temperature, the crystal structure changes and the shape-memory alloy is brought back to its original shape. Nickel-titanium alloys, or Nitinol, … Continue reading

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Geophone

A geophone is a transducer that converts the movement of the ground into a voltage. Traditional geophones are analog devices that use a spring supported coil and a permanent magnet to generate a magnetic field which creates an output voltage … Continue reading

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Bubble actuation in MEMS

Thermal bubble jet: vapor bubble is generated by thermal heating (current pulse to patterned resistor). The bubble acts as a pump, and ejects liquid from the chamber through a nozzle. When the bubble collapses, liquid refills the chamber by capillary … Continue reading

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Advanced Thermodynamics Notes

Chapter 7 Dead state: when a system of interest is at T0 and p0, and at rest relative to the environment. Exergy: the maximum theoretical work obtainable from an overall system consisting of a system and the environment as the … Continue reading

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Fuel Cells

Fuel Cells are electrochemical devices which use fuel (usually hydrogen or methanol), and an oxidizer (usually oxygen from air). The hydrogen based fuel reacts with the oxidizer on separate electrodes, the anode and cathode. A basic type of fuel cell … Continue reading

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