Renault Twingo "CarBuyer" scored it four out of five stars, praising its maneuverability, design, and rear passenger space but criticizing its wind noise and high price compared to its rivals. "What Car?" gave the car three out of five stars, saying: "The Renault Twingo mixes cheeky retro styling with genuine practicality. It’s neither as refined nor as comfortable as the best city cars, though." The third generation Twingo was previewed through two concepts, the Twin'Z and the Twin'Run. The Twin'Z is a city car concept unveiled in April 2013. Its styling was created in partnership with British designer Ross Lovegrove. According to
Quantitative models of the action potential that again, there are only two time-dependent variables: the transmembrane voltage "V" and the potassium gate probability "n". The bursting, entrainment and other mathematical properties of this model have been studied in detail. The simplest models of the action potential are the "flush and fill" models (also called "integrate-and-fire" models), in which the input signal is summed (the "fill" phase) until it reaches a threshold, firing a pulse and resetting the summation to zero (the "flush" phase). All of these models are capable of exhibiting entrainment, which is commonly observed in nervous systems. Whereas the above models simulate the transmembrane