1. INTRODUCTION
Rocket engines that work much like an automobile engine are being developed at NASAâ„¢s Marshall Space Flight Center in Huntsville, Ala. Pulse detonation rocket engines offer a lightweight, low-cost alternative for space transportation. Pulse detonation rocket engine technology is being developed for upper stages that boost satellites to higher orbits. The advanced propulsion technology could also be used for lunar and planetary Landers and excursion vehicles that require throttle ....etc

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1. INTRODUCTION
1.1 ABSTRACT
Broadly, port knocking is a form of host-to-host communication in which information flows across closed ports. There are various variants of the port knocking method - information may be encoded into a port sequence or a packet-payload. In general, data are transmitted to closed ports and received by a monitoring daemon which intercepts the information without sending a receipt to the sender.
In one instance, port knocking refers to a method of communication between two computers (arb ....etc

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A pulse detonation engine is an unsteady propulsive device in which the combustion chamber is periodically filled with a reactive gas mixture, a detonation is initiated, the detonation propagates through the chamber, and the product gases are exhausted. The high pressures and resultant momentum flux out of the chamber generate thrust.

Quasi-steady thrust levels can be achieved by repeating this cycle at relatively high frequency and/or using more than one combustion chamber operating out of phase.A pulse ....etc

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