Rina Dechter is a distinguished professor of computer science in the Donald Bren School of Information and Computer Sciences at University of California, Irvine. Her research focuses on automated reasoning and constraint satisfaction in artificial intelligence. In 2013, she was elected a Fellow of the Association for Computing Machinery.

Alternating current (AC) is an electric current which periodically reverses direction, in contrast to direct current (DC) which flows only in one direction. Alternating current is the form in which electric power is delivered to businesses and residences, and it is the form of electrical energy that consumers typically use when they plug kitchen appliances, televisions, fans and electric lamps into a wall socket. A common source of DC power is a battery cell in a flashlight. The abbreviations AC and DC are often used to mean simply alternating and direct, as when they modify current or voltage. The usual waveform of alternating current in most electric power circuits is a sine wave, whose positive half-period corresponds with positive direction of the current and vice versa. In certain applications, like guitar amplifiers, different waveforms are used, such as triangular or square waves. Audio and radio signals carried on electrical wires are also examples of alternating current. These types of alternating current carry information such as sound (audio) or images (video) sometimes carried by modulation of an AC carrier signal. These currents typically alternate at higher frequencies than those used in power transmission.

Markham Football Club
Markham F.C.
Markham FC
Markham FC is a semi-professional association football team based in the Markham District of Papua New Guinea. The club was founded in 2017, although may have existed in some form before 2007. The club's finest achievement to date was their third-place finish in the 2017 edition of the Papua New Guinea National Premier League, during which they finished top of the Northern Conference.

Alternating current (AC) is an electric current which periodically reverses direction, in contrast to direct current (DC) which flows only in one direction. Alternating current is the form in which electric power is delivered to businesses and residences, and it is the form of electrical energy that consumers typically use when they plug kitchen appliances, televisions, fans and electric lamps into a wall socket. A common source of DC power is a battery cell in a flashlight. The abbreviations AC and DC are often used to mean simply alternating and direct, as when they modify current or voltage.