Abstract: A preparation method and an application of a tailings-based zeolite@carbon dots-titanium dioxide (CDs-TiO2) composite photocatalyst are provided, which relates to the field of solid waste utilization technologies. The preparation method includes performing an acidification treatment on tailings powder and then roasting to obtain modified tailings powder; adding the modified tailings powder and titanium dioxide into lye to obtain mixed suspension; stirring and aging the mixed suspension under ultraviolet irradiation to obtain an aged suspension, performing a hydrothermal reaction on the aged suspension to obtain a product, filtering, washing and drying the product to obtain the tailings-based zeolite@CDs-TiO2 composite photocatalyst.

Abstract: The disclosure discloses recombinant Bacillus subtilis for synthesizing e lacto-N-neotetraose yield. The recombinant Bacillus subtilis is obtained by integrating two ?-1,4-galactotransferase genes on a genome of a host bacterium Bacillus subtilis 168?amyE:P43-lacY, P43-lgtB, PxylA-comK and exogenously expressing a ?-1,3-N-glucosaminotransferase gene. Compared with a strain before transformation, the recombinant Bacillus subtilis of the disclosure improves the yield of the synthesized lacto-N-neotetraose from 720 mg/L to 1300 mg/L, laying a foundation for further metabolic engineering transformation of Bacillus subtilis for producing the lacto-N-neotetraose.

Abstract: A method to maintain network service for a mobile equipment includes reading a current integrated circuit card identification (ICCID) value when the mobile equipment supports a hot swap function and a remove interrupt is not triggered by hardware in response to a polling error triggered by a universal integrated circuit card (UICC). The method also includes comparing the current ICCID value to a cached ICCID value captured during a UICC initialization. The method further includes maintaining a current state of the UICC when the current ICCID value matches the cached ICCID value.

Abstract: A self-sensing and separated dual-cylinder magnetorheological damper includes a first piston cylinder and a second piston cylinder which are in angular communication with each other. The first piston cylinder includes a piston inner cylinder and a piston outer cylinder which together with the second piston cylinder form a magnetorheological fluid circulation channel. The piston inner cylinder is provided with a piston rod assembly reciprocating in an axial direction of the piston inner cylinder, and when the piston rod assembly is compressed and restored, the magnetorheological liquid correspondingly forms a first circulation loop and a second circulation loop respectively. The second piston cylinder is provided therein with a magnetorheological liquid adjustment mechanism for forming the first circulation loop and the second circulation loop.

Abstract: The disclosure discloses recombinant Bacillus subtilis for synthesizing e lacto-N-neotetraose yield. The recombinant Bacillus subtilis is obtained by integrating two ?-1,4-galactotransferase genes on a genome of a host bacterium Bacillus subtilis 168?amyE:P43-lacY, P43-lgtB, PxylA-comK and exogenously expressing a ?-1,3-N-glucosaminotransferase gene. Compared with a strain before transformation, the recombinant Bacillus subtilis of the disclosure improves the yield of the synthesized lacto-N-neotetraose from 720 mg/L to 1300 mg/L, laying a foundation for further metabolic engineering transformation of Bacillus subtilis for producing the lacto-N-neotetraose.