A centerless grinder 1 according to the present invention comprises a bed 108, a grinding wheel spindle stock 101, a regulating wheel spindle stock 102, a work rest 103, and the like. The voltage comparator compares a pixel signal inputted via the vertical signal line at each row control signal line with a reference voltage, thereby generating a pulse signal having a length in time axis corresponding to the magnitude of a reset component and a signal component. In another aspect, a method for controlling temperature inside a vehicle is provided that comprises determining a power for a first zone and a third zone of the vehicle, determining a mass transfer in a second zone of the vehicle, and determining a discharge temperature for one of the first zone, second zone, and third zone of the vehicle based on a mass transfer between two zones of the vehicle. Available processing options include spectral agility for optimizing channel capacity, symbol shaping to compensate for evolving channel conditions, and echo cancellation. Also a method to retard cementitious composition for oilfield application is disclosed, the method comprising the unique double step of adding an organic retarder having at least one carboxylate group and adding copper ions such that a complex is made between copper ion and carboxylate group.