Abstract: A method for preparing a fluorescent semiconductor nanocrystal material. At least one semiconductor nanocrystal precursor is uniformly mixed with a micro/mesoporous material to form a mixture. The mixture is calcined under a temperature higher than or equal to a collapse temperature of the micro/mesoporous material to obtain the fluorescent semiconductor nanocrystal material. This application also provides a fluorescent semiconductor nanocrystal material prepared through the method, and applications thereof in the manufacture of a light-emitting diode device and a color conversion display panel.

Abstract: A train compartment brake control method includes: acquiring the number of train compartments of a current train; acquiring the number and type of a current train compartment; and on the basis of a train brake instruction and the number of train compartments of the current train, calculating a braking force of the current train compartment, and performing brake control on the current train compartment. The technical solution described in the present application is applicable to a train having any number of train compartments. The above method acquires the number of train compartments of a train in real time, calculates the braking force required by each train compartment according to the number and type of a current train compartment, and performs brake control on the train.

Abstract: The present invention provides a carbon nitride-based photocatalyst and a preparation method thereof. The photocatalyst is prepared by reaction of melem with 3,3?,4,4?-benzophenonetetracarboxylic dianhydride. The photocatalyst according to an embodiment of the present invention achieves energy level matching in structure between the melem structure and the 3,3?,4,4?-benzophenonetetracarboxylic dianhydride, reduces a singlet-triplet energy gap (?EST), promotes an intersystem crossing process, thereby enhancing the singlet oxygen production and improving the selective photocatalytic oxidation ability.

Abstract: A method for preparing a fluorescent semiconductor nanocrystal material. At least one semiconductor nanocrystal precursor is uniformly mixed with a micro/mesoporous material to form a mixture. The mixture is calcined under a temperature higher than or equal to a collapse temperature of the micro/mesoporous material to obtain the fluorescent semiconductor nanocrystal material. This application also provides a fluorescent semiconductor nanocrystal material prepared through the method, and applications thereof in the manufacture of a light-emitting diode device and a color conversion display panel.

Abstract: A train compartment brake control method comprises the following steps: acquiring the number of train compartments of a current train; acquiring the number and type of a current train compartment; and on the basis of a train brake instruction and the number of train compartments of the current train, calculating a braking force of the current train compartment, and performing brake control on the current train compartment. The technical solution described in the present application is applicable to a train having any number of train compartments. The above method acquires the number of train compartments of a train in real time, calculates the braking force required by each train compartment according to the number and type of a current train compartment, and performs brake control on the train.

Abstract: The present invention provides a carbon nitride-based photocatalyst and a preparation method thereof. The photocatalyst is prepared by reaction of melem with 3,3?,4,4?-benzophenonetetracarboxylic dianhydride. The photocatalyst according to an embodiment of the present invention achieves energy level matching in structure between the melem structure and the 3,3?,4,4?-benzophenonetetracarboxylic dianhydride, reduces a singlet-triplet energy gap (?EST), promotes an intersystem crossing process, thereby enhancing the singlet oxygen production and improving the selective photocatalytic oxidation ability.

Abstract: An obstacle removing and energy absorbing device provided with an obstacle removing beam (6) and a bumper cross-beam (15) which are oppositely arranged, an energy-absorbing tube assembly with an energy-absorbing tube (9) is fixedly connected between the obstacle removing beam (6) and the bumper cross-beam (15), a mounting base (8) is fixedly connected with one end of the energy-absorbing tube (9), a crushing support (13) is threaded onto the other end of the energy-absorbing tube (9), the crushing support (13) is provided with a variable-diameter through-hole, a crushing-convex portion (20) is provided in the variable-diameter through-hole, a concave portion (21) matched with the crushing-convex portion (20) is arranged at an end portion where the energy-absorbing tube (9) is penetrated into the crushing support (13), the mounting base (8) is fixedly connected with the obstacle removing beam (6), the crushing support (13) is fixedly connected with the bumper cross-beam (15).

Abstract: An obstacle removing and energy absorbing device provided with an obstacle removing beam (6) and a bumper cross-beam (15) which are oppositely arranged, an energy-absorbing tube assembly with an energy-absorbing tube (9) is fixedly connected between the obstacle removing beam (6) and the bumper cross-beam (15), a mounting base (8) is fixedly connected with one end of the energy-absorbing tube (9), a crushing support (13) is threaded onto the other end of the energy-absorbing tube (9), the crushing support (13) is provided with a variable-diameter through-hole, a crushing-convex portion (20) is provided in the variable-diameter through-hole, a concave portion (21) matched with the crushing-convex portion (20) is arranged at an end portion where the energy-absorbing tube (9) is penetrated into the crushing support (13), the mounting base (8) is fixedly connected with the obstacle removing beam (6), the crushing support (13) is fixedly connected with the bumper cross-beam (15).

Abstract: The present invention provides a drag reduction device between carriages of high-speed multiple units for reducing air drag, which belongs to the technical field of railway carriages. The technical solution of the present invention is as follows: a drag reduction device between carriages of high-speed multiple units comprises side windshields arranged on side edges of each end wall of a carriage body. Each of the side windshields includes a bar rubber capsule and a rubber capsule frame whose shapes are matched with a curve of the side edge of the end wall of the carriage body. The rubber capsule is connected with the end wall of the carriage body by the rubber capsule frame. The device is simple in structure, convenient and quick to install, and the multiple units need not to be broken up or made up. Furthermore, the device can effectively reduce the air drag resulting from the impact of the airflow on the end wall of the carriage body and increase the running speed of the train.