The influence of weather and temperature on pedestrian walking characteristics on the zigzag bridge.

With the increasing number of tourists in recent years, ensuring the safety of visitors in tourist attractions has become an enormous challenge for safety management. At present, many experiments have been conducted to study pedestrian dynamics, but empirical data on tourists' movement state under different weather conditions are still few. Therefore, a series of field experiments were conducted to analyze the effect of external weather and temperature on pedestrians' movement characteristics.

Monotonicity of the number of positive entries in nonnegative matrix powers.

Let be a nonnegative matrix of order and denote the number of positive entries in . We prove that if or , then the sequence is monotonic for positive integers .