Systems and methods are disclosed for online distribution of content based on a user sentiment index. The cylinder body has a cylinder and a valve recess communicated with the cylinder. An entity is established in a data structure that corresponds to the single biologicalchemical object. The logic circuitry outputs a power identification signal based on the signals received from the outputs of the first and second comparators. All of the slots have their concave sides facing in the upstream direction of chip flow in the digester.