Abstract: A multifunctional folding table is provided. The multifunctional folding table includes a table frame assembly having a pair of supporting frames arranged at intervals and a pair of cross frames hinged with each other. Each cross frame is hinged with the corresponding supporting frame. The multifunctional table further includes a table board assembly having at least a main table board hinged between the pair of supporting frames and a pair of side table boards respectively extending away from the main table board from each supporting frame. Each side table board is hinged to the corresponding supporting frame. The main table board and the side table board are synchronously folded towards the supporting frame through a first linkage mechanism.

Abstract: A double-friction pendulum three-dimensional vibration isolation bearing (1), includes a first support plate (10), a second support plate (20), a vertical vibration isolation unit, a first sliding end portion (40) and a second sliding end portion (50). At least one of the first support plate (10) and the second support plate (20) is movable. The vertical vibration isolation unit is disposed between the first support plate (10) and the second support plate (20).

Abstract: A trampoline is provided, the trampoline including a trampoline frame and leg pipes for supporting the trampoline frame. Each leg pipe includes a cross pipe and two stand pipes, the two stand pipes being detachably connected to two ends of the cross pipe to form a U-shaped structure. An upper end of each stand pipe is detachably connected to the trampoline frame.

Abstract: The disclosure discloses an electro-hydraulic servo actuator capable of implementing long-stroke and high-frequency loading and a control method. The actuator includes: a long hydraulic cylinder with a piston, a short hydraulic cylinder with a piston, a fixed-end rod, low frequency and high frequency electro-hydraulic servo valves, a left rod chamber, a right rod chamber, a force applying end head, and a force applying end rod. With this structure, the displacement of the piston of the short hydraulic cylinder is a combination of small-displacement and high-frequency movement and large-displacement and low-frequency movement, so as to realize the generation of large-displacement and high-frequency movement. Therefore, a target large-displacement and high-frequency excitation is applied to the specimen under load test. The actuator can output high-frequency and large-displacement target excitation of 0.

Abstract: A double-friction pendulum three-dimensional vibration isolation bearing (1), includes a first support plate (10), a second support plate (20), a vertical vibration isolation unit, a first sliding end portion (40) and a second sliding end portion (50). At least one of the first support plate (10) and the second support plate (20) is movable. The vertical vibration isolation unit is disposed between the first support plate (10) and the second support plate (20).

Abstract: The disclosure discloses an electro-hydraulic servo actuator capable of implementing long-stroke and high-frequency loading and a control method. The actuator includes: a long hydraulic cylinder with a piston, a short hydraulic cylinder with a piston, a fixed-end rod, low frequency and high frequency electro-hydraulic servo valves, a left rod chamber, a right rod chamber, a force applying end head, and a force applying end rod. With this structure, the displacement of the piston of the short hydraulic cylinder is a combination of small-displacement and high-frequency movement and large-displacement and low-frequency movement, so as to realize the generation of large-displacement and high-frequency movement. Therefore, a target large-displacement and high-frequency excitation is applied to the specimen under load test. The actuator can output high-frequency and large-displacement target excitation of 0.

Abstract: A sub assembly for coupling to a drill string, the assembly comprising; a mandrel; a sleeve arranged to be co-axially positioned about said mandrel; a first stop arranged to prevent axial movement of the sleeve along the mandrel in a first direction; a second stop arranged to prevent axial movement of the sleeve in a second direction; wherein said second stop is releasably engageable from the mandrel.

Abstract: Some embodiments of the invention relate to a surveying pole comprising: at least two pole sections being telescopically insertable into each other so that a height adjustment of the pole is provided, a pointing tip at the lower end of the pole for setting the pole on a terrain point, a position giving means arranged on the pole, a height measuring system for measuring the height of the position giving means relative to the terrain point, wherein the height measuring system comprises a magneto-strictive wire placed inside of the pole, a magnet interacting with the wire, the positioning of the magnet relative to the wire being linked to the height adjustment of the pole, a sensor circuitry for emitting current pulses through the wire, a signal transducer, and a decoder for evaluating the signals and the current pulses, and therewith deriving the height of the position giving means.

Abstract: In an embodiment, a distance measuring device comprises an absolute distance measuring module, a tracking module, a two-axis rotating mechanism and a signal controlling and processing module to track an object and measure a distance between the distance measuring device and the object. The absolute distance measuring module measures an absolute distance between the distance measuring device and the object. The absolute distance measuring module and the tracking module are combined by using a dichroic beam splitter, and then all of them are further disposed in the two-axis rotating mechanism. When the object moves, a tracking optical path changes accordingly. A quadrant photodetector of the absolute distance measuring module detects the changes to avoid the distance measuring optical path being interrupted, and generates and transmits the signal to the signal controlling and processing module for controlling the two-axis rotating mechanism to rotate, thereby tracking the object.

Abstract: A sub assembly for coupling to a drill string, the assembly comprising; a mandrel; a sleeve arranged to be co-axially positioned about said mandrel; a first stop arranged to prevent axial movement of the sleeve along the mandrel in a first direction; a second stop arranged to prevent axial movement of the sleeve in a second direction; wherein said second stop is releasably engageable from the mandrel.

Abstract: Provided in the present invention is a method for avoiding downlink interference between an indoor DAS system and a small base station, the steps comprising: step 1: determining an initial access RU, and establishing a signal strength table; step 2: the DAS system, by means of the chosen RU, attempts to establish a downlink with UE 1, and detects the signal to interference plus noise ratio (SINR) value of the downlink signal of UE 1, and comparing same with a preset threshold value ?1; step 3: UE 1 maintains one or a plurality of RU downlinks assigned thereto by the DAS system, during the communication process continuously detects an SINR value at a set time interval, and on the basis of whether same is greater than ?1, ensures a corresponding service quality.

Abstract: The present invention provides a method for resisting small base station uplink signal interference of an indoor DAS based on antenna selection. The method comprises: step 1: determining an initial access RU, and establishing an uplink; step 2: determining, by the access RU of UE 1 on the basis of the level of interference, whether to switch to another RU, and continuously detecting, by the access RU of UE 1 an SINR value at a set time interval, and comparing the SINR with a preset threshold value ?1; wherein if the SINR value is lower than ?1, an MU sets the access RU and each peripheral RU as a candidate RU, and the MU, on the basis of the acquired SINR value of each RU, selects an SINR greater than ?1 and sets the RU having the greatest receiving signal power as the new access RU of UE 1.

Abstract: The present invention provides a method for resisting small base station uplink signal interference of an indoor DAS based on antenna selection. The method comprises: step 1: determining an initial access RU, and establishing an uplink; step 2: determining, by the access RU of UE 1 on the basis of the level of interference, whether to switch to another RU, and continuously detecting, by the access RU of UE 1 an SINR value at a set time interval, and comparing the SINR with a preset threshold value ?1; wherein if the SINR value is lower than ?1, an MU sets the access RU and each peripheral RU as a candidate RU, and the MU, on the basis of the acquired SINR value of each RU, selects an SINR greater than ?1 and sets the RU having the greatest receiving signal power as the new access RU of UE 1.

Abstract: Provided in the present invention is a method for avoiding downlink interference between an indoor DAS system and a small base station, the steps comprising: step 1: determining an initial access RU, and establishing a signal strength table; step 2: the DAS system, by means of the chosen RU, attempts to establish a downlink with UE 1, and detects the signal to interference plus noise ratio (SINR) value of the downlink signal of UE 1, and comparing same with a preset threshold value ?1; step 3: UE 1 maintains one or a plurality of RU downlinks assigned thereto by the DAS system, during the communication process continuously detects an SINR value at a set time interval, and on the basis of whether same is greater than ?1, ensures a corresponding service quality.

Abstract: In an embodiment, a distance measuring device comprises an absolute distance measuring module, a tracking module, a two-axis rotating mechanism and a signal controlling and processing module to track an object and measure a distance between the distance measuring device and the object. The absolute distance measuring module measures an absolute distance between the distance measuring device and the object. The absolute distance measuring module and the tracking module are combined by using a dichroic beam splitter, and then all of them are further disposed in the two-axis rotating mechanism. When the object moves, a tracking optical path changes accordingly. A quadrant photodetector of the absolute distance measuring module detects the changes to avoid the distance measuring optical path being interrupted, and generates and transmits the signal to the signal controlling and processing module for controlling the two-axis rotating mechanism to rotate, thereby tracking the object.

Abstract: A manufacturing method of a semiconductor structure includes the following steps. A first isolation layer is formed on a first surface of a wafer substrate. A conductive pad is formed on the first isolation layer. A hollow region through the first surface and a second surface of the wafer substrate is formed, such that the first isolation layer is exposed through the hollow region. A laser etching treatment is performed on the first isolation layer that is exposed through the hollow region, such that a first opening is formed in the first isolation layer, and a concave portion exposed through the first opening is formed in the conductive pad.

Abstract: A manufacturing method of a semiconductor structure includes the following steps. A first isolation layer is formed on a first surface of a wafer substrate. A conductive pad is formed on the first isolation layer. A hollow region through the first surface and a second surface of the wafer substrate is formed, such that the first isolation layer is exposed through the hollow region. A laser etching treatment is performed on the first isolation layer that is exposed through the hollow region, such that a first opening is formed in the first isolation layer, and a concave portion exposed through the first opening is formed in the conductive pad.

Abstract: Some embodiments of the invention relate to a surveying pole comprising: at least two pole sections being telescopically insertable into each other so that a height adjustment of the pole is provided, a pointing tip at the lower end of the pole for setting the pole on a terrain point, a position giving means arranged on the pole, a height measuring system for measuring the height of the position giving means relative to the terrain point, wherein the height measuring system comprises a magneto-strictive wire placed inside of the pole, a magnet interacting with the wire, the positioning of the magnet relative to the wire being linked to the height adjustment of the pole, a sensor circuitry for emitting current pulses through the wire, a signal transducer, and a decoder for evaluating the signals and the current pulses, and therewith deriving the height of the position giving means.