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: The present application relates to a substrate, an LED light source assembly and manufacturing methods therefor. The substrate includes a first substrate and a second substrate which are arranged in a stacked manner. Electrode soldering regions on the front side of the first substrate and corresponding first conductive regions on the back side of the first substrate are electrically connected; and second conductive regions on the front side of the second substrate and corresponding third conductive regions on the back side of the second substrate are electrically connected, where the corresponding first conductive regions and the corresponding second conductive regions are electrically connected.