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The Coolest Cooler was a multi-function cooler that was initially funded through the crowdfunding website Kickstarter. In the summer of 2014, Ryan Grepper raised over $13 million, making it the most funded Kickstarter campaign of 2014. [ 2 ]
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Air cycle machines were first developed in the 19th century for providing chilling on ships. The technique is a reverse Brayton cycle (the thermodynamic cycle of a gas turbine engine) and is also known as a Bell Coleman cycle or "Air-Standard Refrigeration Cycle".
However, the important thing to note is that z 1/2 = e (Log z)/2, so z 1/2 has a branch cut. This affects our choice of the contour C . Normally the logarithm branch cut is defined as the negative real axis, however, this makes the calculation of the integral slightly more complicated, so we define it to be the positive real axis.