Abstract: The present invention discloses the application of an ursodeoxycholic acid and its pharmaceutical salt in the preparation of an antitumor drug and an antitumor drug. Through research, it is discovered that ursodeoxycholic acid and its pharmaceutical salt have good inhibition effect on a variety of tumor cells, and further research reveals that they function by reducing the proportion of regulatory T cells in tumor infiltrating lymphocytes. Therefore, ursodeoxycholic acid can be used in the preparation of an antitumor drug. Besides, as a clinically used choleretic drug, ursodeoxycholic acid does not require clinical safety evaluation, and has good application prospects. It can also be used as an ancillary drug to improve the therapeutic effect of anti-PD-1 drugs.

Abstract: A Volume Bragg grating (VBG) is placed in the back of a collimating lens, the incident angle between exposure light beam and the Volume Bragg grating is equal to the Bragg angle of the Volume Bragg grating. A photodetector is placed in the ?1 grade transmission diffraction light path of the Volume Bragg grating which the exposure light beam is emitted to. The pinhole filter is moved back and forth along an optical axis and the reading of the photodetector is observed in real time. When the reading of the photodetector is maximum, fix the pinhole filter and keep the distance between the first pinhole filter and the first collimating lens a constant. The method for adjusting the self-collimation optical path is provided, using the Volume Bragg grating to detect the parallelism of self-collimation light and substituting for a traditional Moire pattern adjustment method.

Abstract: A current collecting board includes a base board, a conductive board mounted on the base board, a number of conductive plates, and a number of security elements. The base board includes a first surface, a second surface, and a number of receiving protrusions extending upwardly from the first surface. The base board defines a number of first through holes, each receiving protrusion surrounds a first through hole. Each conductive plate defines a second through hole. The receiving protrusion includes a number of leading blocks and a number of clamping blocks; each conductive plate is received in a receiving protrusion and clamped between the leading blocks and the clamping blocks. One end of each security element is solder to and electrically connected to a conductive plate, the other end of each security element is soldered to the conductive board. A battery module using the current collecting board is also provided.

Abstract: A Volume Bragg grating (VBG) is placed in the back of a collimating lens, the incident angle between exposure light beam and the Volume Bragg grating is equal to the Bragg angle of the Volume Bragg grating. A photodetector is placed in the ?1 grade transmission diffraction light path of the Volume Bragg grating which the exposure light beam is emitted to. The pinhole filter is moved back and forth along an optical axis and the reading of the photodetector is observed in real time. When the reading of the photodetector is maximum, fix the pinhole filter and keep the distance between the first pinhole filter and the first collimating lens a constant. The method for adjusting the self-collimation optical path is provided, using the Volume Bragg grating to detect the parallelism of self-collimation light and substituting for a traditional Moire pattern adjustment method.

Abstract: A current collecting board includes a base board, a conductive board mounted on the base board, a number of conductive plates, and a number of security elements. The base board includes a first surface, a second surface, and a number of receiving protrusions extending upwardly from the first surface. The base board defines a number of first through holes, each receiving protrusion surrounds a first through hole. Each conductive plate defines a second through hole. The receiving protrusion includes a number of leading blocks and a number of clamping blocks; each conductive plate is received in a receiving protrusion and clamped between the leading blocks and the clamping blocks. One end of each security element is solder to and electrically connected to a conductive plate, the other end of each security element is soldered to the conductive board. A battery module using the current collecting board is also provided.