Active millimeter-wave radar can be used for imaging concealed objects and detecting contraband at security checkpoints. Current state-of-the-art systems are based on monostatic or quasimonostatic ...

Alida Becker was an editor at the Book Review for 30 years. She was the first winner of the National Book Critics Circle Award for excellence in reviewing.

An important aspect in path planning for mobile robots is to find the shortest path length from one point to another. In this paper, we implement HCTNav algorithm, A∗ and Dijkstra's algorithms on grid ...

The Aztec Empire is among the most famous Mesoamerican societies that existed before the arrival of Europeans. Formed by three city-states in the valley of Mexico (Tenochtitlan, Texcoco, and Tlacopan) ...

But even today, some road sections around Mexico City are “highly related to ancient routes in the Aztec Empire,” according to a paper written by Igor Lugo and Carlos Gershenson.

According to the Anales de Tlatelolco, the earth cracked open in central Mexico on February 19, 1575. The ancient codex, composed around the time the Aztec Empire fell to Spanish conquistadors ...