Abstract: A method for determining a productivity of a coalbed methane well without shutting down the well includes steps of: obtaining coalbed methane basic data; based on PVT experimental data, determining a relationship table between a pressure and a coalbed methane deviation factor, and a relationship table between the pressure and a pseudo-pressure; recording daily gas production rates, bottomhole flow pressures, and cumulative gas productions at each stabilized flow pressure test moment in at least three different production stages; determining formation pressures corresponding to each stabilized flow pressure test moment based on a material balance equation; according to the formation pressures, the bottomhole flow pressures and the production rates, determining coefficients in a deliverability equation of the coalbed methane well for determining the deliverability equation; substituting the formation pressures and the bottomhole flow pressures into the deliverability equation for obtaining corresponding product

Abstract: A foot (200A) of an electronic device includes a first member (220) and a second member (240). The first member (220) is in contact with a support surface when the electronic device is placed on the support surface. The second member (240) is engaged to the first member (220), and the second member (240) is in contact with a body of the electronic device at least when the foot (200A) is subjected to mechanical impact. The first member (220) has hardness greater than that of the second member (240).

Abstract: A battery-locking mechanism for securing a battery (60) having an upper end in a portable electronic device (1) includes a plurality of spring members (50) which are received in a plurality of receptacles (28) defined by a plurality of partition walls. A battery-receiving compartment (24) is defined by an upper wall (242), a lower wall (246), and a bottom (248). A plurality of apertures (2422) is defined through the upper wall. Each receptacle is located adjacent to the upper wall and is in communication with the aperture. Each spring member includes a base portion (52) and an elastic portion (54). A free end of the elastic portion extends to the aperture. A tab protrudes from the upper end of the battery, extending into the aperture when the battery is arranged into the battery-receiving compartment, and the spring element then presses against the tab of the battery. The battery is thus secured in the battery-receiving compartment of the portable electronic device.

Abstract: A battery-locking mechanism for securing a battery (60) having an upper end in a portable electronic device (1) includes a plurality of spring members (50) which are received in a plurality of receptacles (28) defined by a plurality of partition walls. A battery-receiving compartment (24) is defined by an upper wall (242), a lower wall (246), and a bottom (248). A plurality of apertures (2422) is defined through the upper wall. Each receptacle is located adjacent to the upper wall and is in communication with the aperture. Each spring member includes a base portion (52) and an elastic portion (54). A free end of the elastic portion extends to the aperture. Wherein a tab protrudes from the upper end of the battery, extending into the aperture when the battery is arranged into the battery-receiving compartment, the spring element then presses against the tab of the battery. The battery is thus secured in the battery-receiving compartment of the portable electronic device.