Abstract: A tracer particle spreading device for a boundary layer flow visualization experiment based on a flat plate includes a tracer particle generator, a smoke storage box, and a wall-surface particle distribution box. Fume and oil are pressurized by a micro pump and flows into a heating pipe to be heated and vaporized, and then is ejected from a nozzle to form tracer particles. The tracer particles enter the smoke storage box via a smoke guiding tube. An axial flow fan is mounted on a wall surface of the smoke storage box. The tracer particles enter a cavity of the wall-surface particle distribution box via the smoke guiding tube, and the tracer particles are rectified by a rectifying plate and ejected from a spreading slit. An outlet of the spreading slit is at an angle of 15° with respect to an experiment flat plate.

Abstract: An embodiment of this application provides a method and apparatus for testing control software, and a computer-readable storage medium to reduce the time consumed in the simulation-based debugging and enhance efficiency. The method may include obtaining test information of a plurality of fault signals; and injecting, based on the test information of the plurality of fault signals, the plurality of fault signals into a simulation environment in sequence to obtain test results of the plurality of fault signals handled by the control software, where the simulation environment may be a simulation environment of a control object of the control software.

Abstract: Disclosed are an online meeting interface method and apparatus, a medium, and a computer program product, which relate to the technical field of online meetings. The method includes obtaining a frame background image of the online meeting in a same-frame mode; generating a same-frame picture based on the frame background image and video pictures of participants, the video pictures of different participants being displayed at different positions of the frame background image; and pushing the same-frame picture to clients of the participants. The clients may display the same-frame picture in the online meeting interface.

Abstract: The present disclosure relates to a system and method for determining a traffic condition. The systems may perform the methods to: obtain a length of a road segment, where an upstream intersection and a downstream intersection is linked by the road segment; determine a first queue length of a queue on the road segment at a first time point and a second queue length of the queue at a second time point; determine a duration of the second queue length, based on a cycle length of the first traffic light corresponding to the downstream intersection, a cycle length of the second traffic light corresponding to the upstream intersection, a free-flow speed corresponding to the road segment, a back-propagation wave speed corresponding to the road segment, and the first queue length; and determine whether the second queue length exceeds the length of the road segment.

Abstract: The present invention discloses a web polling system, comprising at least one client, a web server, and a database server, wherein the client is configured to transmit a web polling request; the database server is configured to push data added locally to the web server in real time; and the web server is configured to store the data pushed by the database server, to query in the data stored by the web server itself upon receiving the Web polling request sent by the client, and to return the found data to the client. The present invention can reduce system load and hardware cost. The present invention further discloses a corresponding device and method.

Abstract: An identity based automated form filling method includes maintaining an association of a user, a form, and a plurality of values recorded over time for a plurality of fields of the form. Following a request for the form by the user, the form is caused to be dynamically populated according to the association.