National security has been described as the ability of a state to cater to the protection and defence of its citizenry. It includes Human security which means freedom from pervasive threats to people’s rights, safety, and lives. Homeland security means…...
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Vehicles propelled by rocket engines are commonly called rockets. Rocket vehicles carry their own oxidizer, unlike most combustion engines, so rocket engines can be used in a vacuum to propel spacecraft and ballistic missiles. Compared to other types of jet…...
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An autonomous underwater vehicle (AUV) is a robot that travels underwater without requiring input from an operator. AUVs constitute part of a larger group of undersea systems known as unmanned underwater vehicles, a classification that includes non-autonomous remotely operated underwater…...
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Marine propulsion is the mechanism or system used to generate thrust to move a ship or boat across water. At present, 90% of the sea-going naval ship are diesel-powered. To achieve the safe upper limit for global warming of 1.5 degrees…...
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Millimeter waves are electromagnetic signals with frequencies ranging from 30 to 300 GHz that correspond to wavelengths of 10 to 1 mm in the free space. Electromagnetic waves in the millimeter-wave band (with frequencies between 30 and 300 GHz, or wavelengths…...
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The nature of war refers to the aspects of war that are enduring across time and the change in weapons, states, and societies. It is widely agreed that war has been and will remain a violent act of force, subordinated…...
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The performance of electronics degrades as temperature increases from the ambient temperature. The temperature of a device increases when the device is on since no system operates at 100% efficiency. Output power is not equal to the power fed to…...
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The past few decades have seen an escalation of power densities in electronic devices, and in particular in microprocessor chips. Together with the continuing trend of reduction in device dimensions this has led to dramatic increase in the thermal issues…...
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The armed drones like MQ-1 Predator and its larger cousin, MQ-9 Reaper, dual intelligence, surveillance and reconnaissance-strike platforms have been highly successful against non-state actors as part of the counterterrorism fight. A MQ-1 Predator UAVs armed with Hellfire missiles have…...
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Most of the ocean is unknown. Yet we know that the most challenging environments on the planet reside in it. Understanding the ocean in its totality is a key component for the sustainable development of human activities and for the…...
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