Abstract: A multi-purpose desk lamp capable of adjusting illumination position, comprising a base, a support column connected to the base, a luminous lampshade, a light emitting component inside the luminous lampshade, a pivot structure between the luminous lampshade and the support column, and an open slot on the top surface of the luminous lampshade at a position close to one end. The luminous lampshade can be connected with the pivot structure in a movable manner via a positioning bolt through the open slot. A telescopic sliding structure is provided inside the luminous lampshade. The luminous lampshade can move linearly along the open slot via the telescopic sliding structure or can be tilted upward or downward via the pivot structure, and the positioning bolt can be turned left or right in relation to the pivot structure, to change the illumination position of the luminous lampshade.

Abstract: A high-precision time synchronization (HTS) system and method using virtual atomic clocks (VACs) includes: providing an implementation of VAC generation method: accessing the high-precision time service provided by the WPT system, solving receiver clock offsets and reconstructing reference stations observations; providing a rapid HTS method: using the VAC information to realize rapid HTS by means of pseudorange or carrier phase CV time transfer; obtaining a HTS system using VACs, including a real-time observations receiving and distributing module, a differential corrections receiving and decoding module, a local clock solving module, a GNSS observations reconstruction module, and a VAC data broadcasting module.

Abstract: A high-precision time synchronization (HTS) system and method using virtual atomic clocks (VACs) includes: providing an implementation of VAC generation method: accessing the high-precision time service provided by the WPT system, solving receiver clock offsets and reconstructing reference stations observations; providing a rapid HTS method: using the VAC information to realize rapid HTS by means of pseudorange or carrier phase CV time transfer; obtaining a HTS system using VACs, including a real-time observations receiving and distributing module, a differential corrections receiving and decoding module, a local clock solving module, a GNSS observations reconstruction module, and a VAC data broadcasting module.

Abstract: The present invention discloses is an easy heat-dissipating lamp structure, comprising an outer shell. Inside the upper half space of the outer shell, there are multiple rib plates formed in the direction from top to bottom, so that multiple vertical gaps are formed. A heat dissipator is held inside the lower half space of the outer shell, leaning and fixed on the lower edge of the rib plates. The bottom face of the heat dissipator is attached with a light emitting plate. The heat generated by the light emitting plate is received by the heat dissipator and is discharged through the vertical gaps between the multiple rib plates.

Abstract: Provided are an intermediate for synthesizing a camptothecin derivative, a preparation method therefor, and the use thereof. An intermediate A can be obtained from 3-fluoro-4-methylaniline by means of acylation, bromination, and cross-coupling reactions. The intermediate A can be used for preparing an intermediate B to further prepare exatecan mesylate. The intermediate compound B can be obtained from the intermediate A by means of a rearrangement reaction, and exatecan mesylate can be obtained from the intermediate compound B by means of deprotection for acetamido and amino at the a site, a condensation reaction, and a hydrolysis reaction. The reaction starting materials have a low price, the reaction conditions of each step are moderate, the operation is simple, and the yield is high, such that the intermediate is suitable for industrial production.

Abstract: The present invention discloses a joinable lamp structure, which is made by joining two neighboring lamps through a joining component. A side cap is used to cover the exposed ends of the lamps. After the assembly, the present invention can be embedded inside the mounting slot of the ceiling or suspended below the ceiling.

Abstract: The detachable sunshade umbrella rib includes a first umbrella rib and a second umbrella rib. The first umbrella rib is connected with the second umbrella rib by a sleeve connecting mechanism. The sleeve connecting mechanism includes a clamping hole, a sheath, and an elastic piece. The sheath is disposed on one end of the first umbrella rib. The clamping hole is on the first umbrella rib and is located on one side of the sheath. The elastic piece is disposed on the second umbrella rib; the second umbrella rib is sleeved into the first umbrella rib. The second umbrella rib is fixed with the first umbrella rib through the sheath, the elastic piece, and the clamping hole.

Abstract: The present invention relates to an IEEE1588 protocol negative testing method, comprises steps of: connecting a IEEE1588 tester and a slave clock DUT to establish a real-time closed-loop feedback mechanism; taking the IEEE1588 tester as a master clock, and establishing a stable time synchronization with the slave clock DUT; obtaining the timing offset or path delay of the slave clock DUT before disturbance; assembling an abnormal message in a frame and sending it to the slave clock DUT; calculating the timing offset or path delay increment after disturbance of the abnormal message; determining whether there is a sudden change in the timing offset or path delay of the slave clock DUT, wherein if there is no sudden change, the test passes; otherwise the test fails.

Abstract: The present invention relates to an IEEE1588 protocol negative testing method, comprises steps of: connecting a IEEE1588 tester and a slave clock DUT to establish a real-time closed-loop feedback mechanism; taking the IEEE1588 tester as a master clock, and establishing a stable time synchronization with the slave clock DUT; obtaining the timing offset or path delay of the slave clock DUT before disturbance; assembling an abnormal message in a frame and sending it to the slave clock DUT; calculating the timing offset or path delay increment after disturbance of the abnormal message; determining whether there is a sudden change in the timing offset or path delay of the slave clock DUT, wherein if there is no sudden change, the test passes; otherwise the test fails.

Abstract: A nail gun comprises a case, a pressing element, and a clamping element. The case defines an inserting slot and a holding slot. Two positioning stops are respectively provided in the inserting slot. The pressing element has two strip supports respectively formed on two lateral sides, each strip support having a first positioning edge and a second positioning edge. Two recesses are defined on the pressing element. Each recess can accommodate a specific cable. The first or second positioning edges can be employed to engage with the positioning stops. The length of the pressing element out of the case can be directly determined by the first or positioning stops as well as the positioning edges to facilitate a design. Through the selection of a pressing element, one gun is sufficient to be applied for a variety of cables to facilitate the operation.

Abstract: An electrical component is mounted on a carrier printed circuit board. A first header connector connects the carrier printed circuit board to a printed circuit board on one side of the electrical component. A second header connector connects the carrier printed circuit board to the printed circuit board on the opposite side of the electrical component. The carrier printed circuit board and the printed circuit board are connected so that the electrical component is sandwiched between the carrier printed circuit board and the printed circuit board. The carrier printed circuit board, the first header connector, and the second header connector protect the electrical component from impact and mechanical stress. The carrier printed circuit board redistributes the electrical connection of the electrical component.