Abstract: According to an aspect, an online education platform may be configured to provide an online course over a network to a plurality of computing devices. The online course may provide education content in which learners view and interact with the education content. The online education platform may include an online course analyzer to determine performance data associated with learners' engagement with the education content including an engagement metric indicating a level of engagement of the learners with the education content during a session of the online course, and provide the performance data via an instructor dashboard. The online course analyzer may include a content editor configured to edit the education content based on the performance data including changing at least a portion of the education content based on the performance data before a completion of the online course.

Abstract: A method can present a new sequence of online courses within a specialization for a group of new learners while maintaining a previous sequence of online courses within the specialization for a group of previous learners. The method can include maintaining a base class, associating a first learner with the base class, receiving a request to update a previous sequence of courses, generating a child class, associating a second learner with the child class, responding to a request for a sequence associated with the first learner, and responding to a request for a sequence associated with the second learner.

Abstract: A manufacturing method of a polylactic acid molded article includes implementing a granulating step and a forming step. The granulating step includes: mixing a polylactic acid material, a polylactic acid recovery material having a weight average molecular weight less than that of the polylactic acid material, and a crystallizing agent in an environment of 180? to 250?; carrying out a first molecular chains recombination of the polylactic acid material and the polylactic acid recovery material; and forming a polylactic acid composition after granulation. The forming step includes: filling the polylactic acid composition into a mold with an injection molding machine; carrying out a second molecular chains recombination of the polylactic acid composition in the mold; and forming the polylactic acid molded article after curation. The present disclosure also provides a polylactic acid composition.

Abstract: A wiper ring provided includes a ring body and a number of brushes. The ring body has an outer side surface and an inner side surface opposite to the outer side surface. The wiper ring includes a mounting portion located on the outer side surface. The ring body is mounted to a cable through-hole of a charging pile via the mounting portion. The number of brushes are arranged on the inner side surface. Each of the number of brushes has an end fixed to the inner side surface of the ring body and the other end, opposite to the end, faces a center of the ring body or a defined point of the ring body. The number of brushes cooperatively form a through-hole having a diameter less than that of the cable for allowing a cable to pass through. A charging pile using same is also provided.

Abstract: A packaging structure is provided, including a substrate, a first chip, a second chip, and a conductive unit. The substrate includes a metal carrier, a patterned insulation layer disposed on the metal carrier and partially covering the metal carrier, and a patterned conductive layer disposed on the patterned insulation layer. The first chip is disposed on the metal carrier not covered by the patterned insulation layer. The second chip is disposed on the patterned conductive layer and electrically connected to the first chip by the conductive unit.

Abstract: An tread depth measuring system includes a tread measuring apparatus, a processor, a supporter, and a warning apparatus. The tread measuring apparatus is positioned on the ground and configured to measure a tread depth. The processor is coupled to the tread measuring apparatus and configured to compare the tread depth measured by the tread measuring apparatus with a preset critical depth. The supporter stands on the ground. The warning apparatus is supported by the supporter and coupled to the processor. When the tread depth measured by the tread measuring apparatus is less than the preset critical depth, the processor sends a control signal to actuate the warning apparatus.

Abstract: A power module package is provided, including a substrate, a first chip, and a second chip. The substrate includes a metal carrier, a patterned insulation layer disposed on the metal carrier and partially covering the metal carrier, and a patterned conductive layer disposed on the patterned insulation layer. The first chip is disposed on the metal carrier not covered by the patterned insulation layer. The second chip is disposed on the patterned conductive layer and electrically connected to the first chip.

Abstract: A power module package is provided, including a substrate, a first chip, and a second chip. The substrate includes a metal carrier, a patterned insulation layer disposed on the metal carrier and partially covering the metal carrier, and a patterned conductive layer disposed on the patterned insulation layer. The first chip is disposed on the metal carrier not covered by the patterned insulation layer. The second chip is disposed on the patterned conductive layer and electrically connected to the first chip.

Abstract: A packaging structure is provided, including a substrate, a first chip, a second chip, and a conductive unit. The substrate includes a metal carrier, a patterned insulation layer disposed on the metal carrier and partially covering the metal carrier, and a patterned conductive layer disposed on the patterned insulation layer. The first chip is disposed on the metal carrier not covered by the patterned insulation layer. The second chip is disposed on the patterned conductive layer and electrically connected to the first chip by the conductive unit.

Abstract: A power module package is provided, including a substrate, a first chip, and a second chip. The substrate includes a metal carrier, a patterned insulation layer disposed on the metal carrier and partially covering the metal carrier, and a patterned conductive layer disposed on the patterned insulation layer. The first chip is disposed on the metal carrier not covered by the patterned insulation layer. The second chip is disposed on the patterned conductive layer and electrically connected to the first chip.

Abstract: A power module package is provided, including a substrate, a first chip, and a second chip. The substrate includes a metal carrier, a patterned insulation layer disposed on the metal carrier and partially covering the metal carrier, and a patterned conductive layer disposed on the patterned insulation layer. The first chip is disposed on the metal carrier not covered by the patterned insulation layer. The second chip is disposed on the patterned conductive layer and electrically connected to the first chip.

Abstract: A method includes receiving, by a computer, a video file containing audio content and or visual content. The method further involves, based on a determination of the rates at which information is communicated by different temporal segments of the video file when played back at a default playback speed, assigning a respective target playback speed to each the different temporal segments of the video file. The video file is edited and marked in a format to be played back on a video player so that each of the different temporal segments of the video file can be played back at its respective assigned target playback speed.

Abstract: A system for projecting an image onto a window of a vehicle is supplied. The system includes a support, a camera, a projector, and a projective film. The support is mounted in the vehicle for holding an electronic device. The camera is mounted to relative to the location for capturing an image of the display when the electronic device is mounted on the support. The projector is in signal communication with the camera. The projector projects an image from the camera onto the window. The projective film mounted on the vehicle window configured to act as a projection screen for the projector. When the electronic device is mounted on the support displays an electronic image, the camera captures the image and sends the image to the projector, and the projector projects the image onto the projective film on the window. The discourse also provides a method using the system.

Abstract: A vehicle seat includes a back portion, a seat portion, and two driving assemblies. The back portion includes a resisting portion and a movable portion. The seat portion is coupled to the back portion and includes a bottom wall and a movable wall. One driving assembly is positioned in the back portion and the other driving assembly is positioned in the seat portion. The driving assembly positioned in the back portion is coupled to the movable portion and is configured to drive the movable portion to move relative to the resisting portion. The driving assembly positioned in the seat portion is coupled to the movable wall and is configured to drive the movable wall to move relative to the bottom wall.

Abstract: A self-propelled battery module configured to detachably mounted on an electric vehicle includes a rechargeable battery and a travelling controller assembled together with the rechargeable battery. The rechargeable battery is configured to supply electric power to the electric vehicle. The travelling controller includes a control unit, a driving unit electrically connected to the control unit, and a travelling wheel connected to the driving unit. The control unit is configured to transmit a control signal to the driving unit, and the driving unit is configured to receive the control signal from the control unit and drive the travelling wheel to rotate, and the self-propelled battery is capable of moving automatically.

Abstract: A battery replacement system configured to replace battery for an electric vehicle includes a control system, a first self-propelled battery module and a second self-propelled battery module in communication with the control system. The first self-propelled battery module is configured to detach from the electric vehicle upon receiving an appropriate command from the control system, and second self-propelled battery module is configured to be mounted to the electric vehicle upon receiving an appropriate command from the control system. The first self-propelled battery module and the second self-propelled battery module are capable of moving automatically to an predetermined position. An using method of the battery replacement system is also provided.

Abstract: A wiper ring provided includes a ring body and a number of brushes. The ring body has an outer side surface and an inner side surface opposite to the outer side surface. The wiper ring includes a mounting portion located on the outer side surface. The ring body is mounted to a cable through-hole of a charging pile via the mounting portion. The number of brushes are arranged on the inner side surface. Each of the number of brushes has an end fixed to the inner side surface of the ring body and the other end, opposite to the end, faces a center of the ring body or a defined point of the ring body. The number of brushes cooperatively form a through-hole having a diameter less than that of the cable for allowing a cable to pass through. A charging pile using same is also provided.

Abstract: A road light monitoring device includes a light detecting unit detecting light sources and generating a voltage signal, a storage unit storing a plurality of light parameter ranges, a camera shooting unit and a processing unit. Therein, the processing unit couples with the light detecting unit, the storage unit and the camera shooting unit respectively. The processing unit obtains image data from the voltage signal obtains light parameters from the image data, compares the light parameters with the plurality of light parameter ranges, determines whether the light parameters fall into one of the plurality of light parameter ranges, controls the camera shooting unit to start to shoot images of the light sources when the light parameters do not fall into the one of plurality of light parameter ranges, and transmits the shoot images to a monitoring center via an Internet.

Abstract: An tread depth measuring system includes a tread measuring apparatus, a processor, a supporter, and a warning apparatus. The tread measuring apparatus is positioned on the ground and configured to measure a tread depth. The processor is coupled to the tread measuring apparatus and configured to compare the tread depth measured by the tread measuring apparatus with a preset critical depth. The supporter stands on the ground. The warning apparatus is supported by the supporter and coupled to the processor. When the tread depth measured by the tread measuring apparatus is less than the preset critical depth, the processor sends a control signal to actuate the warning apparatus.

Abstract: According to an aspect, a system may an online education platform configured to provide an online course over a network to a plurality of computing devices. The online course may provide education content in which learners view and interact with the education content. The online education platform may include a content editor may provide an authoring tool on a computing device associated with an instructor of the online course. The authoring tool may develop or change the education content associated with the online course. The content editor may include an education content converter to receive the education content via the authoring tool in a first format, and the education content converter may convert the first format to a second format. The content editor may be configured to provide the education content having the second format to the plurality of computing devices associated with the learners.