Abstract: The present application relates to a CDN node allocation method and apparatus, an electronic device, a medium and a program product, which are applied to the technical field of the Internet. The method includes: acquiring a target physical scene corresponding to a target network request; determining, according to the target physical scene and a pre-established node quality score table, target quality scores of a plurality of types of CDN nodes corresponding to the target physical scene; evaluating the quality of the plurality of types of CDN nodes according to the target quality scores of the plurality of types of CDN nodes to obtain a quality evaluation result; and selecting, according to the number of nodes corresponding to a plurality of types of candidate CDN nodes in a candidate CDN node set and the quality evaluation result, a CDN node of a target type from the candidate CDN node set.

Abstract: An aluminosilicate molecular sieve catalyst, its preparation and application thereof are provided. The catalyst shows a desorption curve having three peaks P1, P2 and P3 in its NH3-TPD pattern. The desorption temperatures corresponding to the summits of the three peaks P1, P2 and P3 are respectively in a range of 180-220° C., 250-290° C. and 370-410° C. The catalyst shows a higher activity, selectivity and stability when used for producing alkylaromatic hydrocarbons by gas-phase alkylation of aromatics with olefins.

Abstract: An active charge equilibrium system for lithium battery pack consists a lithium battery pack composed of connecting multiple cells in series, including a multiplex module, control module and multiple equilibrium control module, which each segment of the cells are connected to the multiplex module in sequence, a voltage signal is converted into a digital signal via the control module to compare the voltages of the cells and select the cell with lower voltage. Further, the control module enables the equilibrium control module corresponding to the cell with the lower voltage to work. A pulse width modulator adjusts the output pulse width according to output current and voltage signal from a signal feedback module for controlling current and voltage to charge the cell. As the voltage of the cell reaches a constant current first and a constant voltage second, the control module turns off said equilibrium control module.

Abstract: An active charge equilibrium system for lithium battery pack consists a lithium battery pack composed of connecting multiple cells in series, including a multiplex module, control module and multiple equilibrium control module, which each segment of the cells are connected to the multiplex module in sequence, a voltage signal is converted into a digital signal via the control module to compare the voltages of the cells and select the cell with lower voltage. Further, the control module enables the equilibrium control module corresponding to the cell with the lower voltage to work. A pulse width modulator adjusts the output pulse width according to output current and voltage signal from a signal feedback module for controlling current and voltage to charge the cell. As the voltage of the cell reaches a constant current first and a constant voltage second, the control module turns off said equilibrium control module.