Abstract: A driving device and a rotary grinding apparatus, comprising: a mounting sleeve (100), an accommodating chamber (101) being axially formed in the mounting sleeve (100), and the two ends of the mounting sleeve (100) in the axial direction being respectively a driving end (110) and a connecting end (120); a driving shaft (200), passing through the accommodating chamber (101) in the axial direction and rotatable about the axis; and a communication valve (300), provided in the accommodating chamber (101), an input channel (301) and a cooling channel (302) penetrating through the communication valve (300) being formed inside the communication valve (300); one end of the input channel (301) being communicated with the cooling channel (302) and the other end being communicated with the outside to introduce a cooling medium; the cooling channel (302) being sleeved outside the driving shaft (200) in a clearance fit manner; and a first outlet (302a) and a second outlet (302b) being respectively formed on one side of th

Abstract: Embodiments of the present disclosure provide network live-broadcasting methods and devices. The method can include: obtaining live-broadcasting data from a server side; obtaining service data from the server side; determining whether the obtained live-broadcasting data contains key information, wherein the key information is inserted by a live-broadcasting side in the live-broadcasting data when predetermined content corresponding to the service data is included in the live-broadcasting data; and outputting, in response to receiving the key information, the service data on a playing interface of the live-broadcasting data, so that the service data is output synchronously with the predetermined content.

Abstract: This invention belongs to the nanotechnology field, and discloses a nano drug delivery system with polyethyleneglycol-poly(lactic-co-glycolic acid)-poly-L-lysine (PEG-PLGA-PLL) polymer as the skeleton. The carrier can have the function of passive targeting through control of the carrier particle size. The polymer skeleton is modified through introducing side chains and specific targeting groups, so as to adjust and improve the carrier performance, and enable the carrier to have the function of active targeting. Such carrier material also has the functions of transporting active substances, tumor treatment and diagnosis, ultrasonic contrast, reversing or reducing drug resistance and so on.