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 engines, rocket engines are the lightest and have the highest …

The words geopolitical, strategic, and geostrategic are used to convey the following meanings: geopolitical reflects the combination of geographic and political factors determining the condition of a state or region, and emphasizing the impact of geography on politics; strategic refers to the comprehensive and planned application of measures to achieve …

For many people, today’s world is an insecure place, full of threats on many fronts. Protracted crises, violent conflicts, natural disasters, persistent poverty, epidemics and economic downturns impose hardships and undercut prospects for peace, stability, and sustainable development. Such crises are complex, entailing multiple forms of human insecurity. When they …

The U.S. military could suffer unacceptably high casualties and struggle to win, or perhaps lose, a war against China or Russia. This implication by the National Defense Strategy Commission stands in contrast to the past several decades during which the U.S. possessed military power without equal. A key capability to …

The modern space industry is witnessing exponential growth in small satellite and nanosatellite areas. Nanosatellite and microsatellite refer to miniaturized satellites in terms of size and weight, in the range of 1-10 Kg and 10-100 kg, respectively. ‘CubeSat’ is one of the most popular types of miniaturized satellites. These are …

To stay healthy, we need to pay not only close attention to what is in the food we eat and the water we drink but also the quality of the air we breathe. The air we breathe both indoors and out can directly impact our health, quality of life, and …

In 2018, The American Society of Mechanical Engineers (ASME)  named the Pratt & Whitney single crystal turbine blade an historic mechanical engineering landmark. These blades, which can be found in many modern, high-performance gas turbines (a.k.a. jet engines)—including the ones powering the F-22 Raptor, and larger electricity-producing turbines—are grown from a …

Bitcoin and other virtual currencies are made possible by what’s known as blockchain technology. Blockchain technology is a digital ledger that consists of distributed, decentralized and often-times public data capable of automatically recording and verifying a high volume of digital transactions, regardless of location.   A blockchain is a type …

It is predicted that LEDs will be the ultimate light source in the near future powering indoor illumination, outdoor lamps, traffic signs, advertising displays, car headlights/taillights, etc. Now another technique  promises to double the utility of light-emitting diodes (LEDs) by using their light as a medium for communication in a …