COVER A circulator for sound. The arrows represent acoustic signals fl owing through the device (diameter: ~20 centimeters), which circulates sound in a nonreciprocal fashion: Signals can fl ow from left to top, from top to right, and from right to left, but not in the opposite directions. This creates one-way communication channels for sound, allowing listeners to hear but not be heard in retu...

Centers Do not oFFer anD the average trip rates oF ite May not represent reCent installations. while the nuMBer oF Fueling positions is an intuitive DesCriptor For sMaller gas stations, the relative iMpaCt oF aDDitional puMps is expeCteDly less at larger Fueling Centers. introDuCtion anD BaCkgrounD Newer, contemporary fueling centers have many commodities that traditional fueling centers do not...

This paper treats air-to-fuel ratio control of a spark ignition engine. A direct adaptive control method using Gaussian neural networks is developed to compensate transient fueling dynamics and the measurement bias of mass air flow rate into the manifold. The transient fueling compensation method is coupled with a dynamic sliding mode control technique that governs fueling rate when the throttl...