Abstract: An improved packing efficiency of helical tube bundles in a heat exchanger is achieved by positioning three 3-tube bundles, two twisted in one direction and the third twisted in the opposite direction, and selecting the angular orientation of the tube bundles so as to allow them to nest together in phase so that peaks of adjacent tube bundles are located between each other, forming a bundle overlap. An exemplary application is an EGR cooler.

Abstract: An improved packing efficiency of helical tube bundles of the same twist in a heat exchanger is achieved by selecting the angular orientation of the tube bundles so as to allow them to nest together in phase so that peaks of adjacent tube bundles are located between each other, forming a bundle overlap. An exemplary application is an EGR cooler.

Abstract: A system and method are disclosed for providing a quantum proof key exchange. The method includes generating at a first computing device a random bit ai, encrypting ai using quantum-proof homomorphic encryption ? to yield ?A(ai), transmitting ?A(ai) to a second computing device, generating at the second computing device a random bit bi, encrypting bi using the quantum-proof homomorphic encryption ? to yield ?B(bi), transmitting ?B(bi) to the first computing device and generating a common key between the first computing device and the second computing device based on ?A(ai) and ?B(bi).

Abstract: Systems and methods for garment decoration utilizing a printing apparatus having a print table configured to receive a print substrate, such as a fabric or transfer sheet, a print head to eject ink onto said print substrate, and a plurality of axes for multi-directional movement for two and three dimensional printing. The printing apparatus further includes a curing unit for simultaneous printing and curing.