Abstract: An LAA-based wireless transmission access method is disclosed including: acquiring, by a BBU, a signal format corresponding to an LBT startup indication, and delivering a corresponding LBT startup indication message; distributing, by a bridge unit, the startup indication message to an RRU; performing, by the RRU, spectrum scanning according to the signal format to obtain idle/busy state information of an unlicensed spectrum in the signal format, and reporting the same to the BBU via the bridge unit; determining, by the BBU, a preemptable unlicensed spectrum in the signal format according to the idle/busy state information, and delivering an occupancy message; delivering, by the bridge unit, the occupancy message to the RRU; determining, by the RRU, a signal source of the signal format in the occupancy message; if the signal source is a different manufacturer, switching to an intermediate radio frequency processing channel of a different manufacturer for transmission.

Abstract: In the present invention, a multi-stage foam sound-absorbing black body material is provided for the first time. A graphene aerogel is introduced into a commercialized polymer foam skeleton by using a solvent plasticizing and foaming technology, so as to embed ultra-thin graphene drums in the foam skeleton. When sound waves enter the foam black body, a large number of graphene drums generate a severe resonance effect, thereby rapidly achieving attenuation of the sound waves, and combined with the friction loss of the porous structure of the polymer foam on the sound waves, excellent sound-absorbing performance is achieved in a wide frequency range. The present solution is provided on the basis of commercialized foam materials, has a simple method, low costs, and the potential of wide industrial application.

Abstract: Disclosed is a grouting and water blocking method for a hard rock stratum. The grouting and water blocking method include the following steps. At first, hydrogeological information and coal seam information of a hard rock stratum is obtained. Then, a drilling trajectory of the hard rock stratum is determined based on the hydrogeological information and the coal seam information. Later, at least one drilling device is determined corresponding to the drilling trajectory based on types of multiple rock layers contained in the hard rock stratum. After that, the multiple rock layers contained in the hard rock stratum are drilled sequentially according to the drilling trajectory using the at least one drilling device. At last, in response to determining there is a water leakage area, the water leakage area is grouted.

Abstract: A directional drilling method applied to a rigid bending joint directional drilling device includes: obtaining geological data; determining a lateral drilling point and a target point of a branching borehole based on the geological data; drawing a target borehole trajectory of the branching borehole based on the lateral drilling point and the target point; obtaining parameters of the drill pipe; determining a propulsion force corresponding to the target borehole trajectory based on the parameters, the target borehole trajectory, and the geological data; and applying the propulsion force to the rigid bending joint directional drilling device for drilling the branching borehole. A directional drilling system and related devices are also disclosed.

Abstract: Disclosed is a method for repairing an aquifer in a coal mine area by grouting, including: drilling a survey hole in a ground area corresponding to a water inflow position from ground surface to a caving zone in a goaf; determining a target layer for grouting in the survey hole based on drilling data collected from the survey hole while drilling; changing the survey hole to a grouting hole; measuring a first water level from the grouting hole; grouting through the grouting hole; changing the grouting hole to an observation hole; measuring a second water level from the observation hole; and determining a water retention level based on the first water level and the second water level.

Abstract: Embodiments are disclosed for crash detection on one or more mobile devices (e.g., smartwatch and/or smartphone. In some embodiments, a method comprises: detecting a crash event on a crash device; extracting multimodal features from sensor data generated by multiple sensing modalities of the crash device; computing a plurality of crash decisions based on a plurality of machine learning models applied to the multimodal features, wherein at least one multimodal feature is a rotation rate about a mean axis of rotation; and determining that a severe vehicle crash has occurred involving the crash device based on the plurality of crash decisions and a severity model.

Abstract: Disclosed are a method and a related device for determining a development status of a separation layer in a coal mine. The method includes: obtaining surface subsidence variation data of the coal mine within a preset time interval, rock stress variation data of a caving zone of the coal mine and water pressure variation data; determining a height decrease of the caving zone based on the rock stress variation data and the water pressure variation data; and determining the development status of the separation layer of the coal mine based on the height decrease and the surface subsidence variation data.

Abstract: A curvature controllable directional drilling device is disclosed. The drilling device includes: a drill bit, a power unit, a rigid bending unit, a bendable outer wall, and a wedge deflection tool. The power unit is to provide a rotary power to the drill bit. The rigid bending unit is set between the drill bit and the power unit, to bend on a basis of an initial curvature under an external force. The bendable outer wall is set on an outer side of the power unit and the rigid bending unit. The wedge deflection tool is set at one end of the bendable outer wall near the drill bit, to receive a reaction force and bend the rigid bending unit. By a coordination between the wedge deflection tool and the power unit, a drilling direction of the drill bit connected to the rigid bending unit can be adjusted.

Abstract: The present invention provides a method for preparing an aerogel based on plasticizing and foaming with solvent, and the aerogel material is prepared through plasticization with solvent and generation of in-situ bubbles. The method solves the difficult problem that the non-polymer is difficult to realize thermoplastic foaming, and has wide applicability. In addition, a lot of foaming agents can be uses for this method, and this method is easy to implement, and does not require a special drying process, so that the industrialization development of the porous aerogel is greatly promote.

Abstract: Embodiments are disclosed for crash detection on one or more mobile devices (e.g., smartwatch and/or smartphone). In some embodiments, a method comprises: detecting, with at least one processor, a crash event on a crash device; extracting, with the at least one processor, multimodal features from sensor data generated by multiple sensing modalities of the crash device; computing, with the at least one processor, a plurality of crash decisions based on a plurality of machine learning models applied to the multimodal features; and determining, with the at least one processor, that a severe vehicle crash has occurred involving the crash device based on the plurality of crash decisions and a severity model.

Abstract: A method for blocking mine water inrush includes: grouting first slurry into an interface between the quaternary aquifer and the weathered bedrock aquifer in a fracture grouting manner until a first preset condition is met; forming a first water-resisting cushion after the first slurry is solidified; drilling a curve branch drill hole in the surface horizon downward; grouting second slurry into the curve branch drill hole in a downward grouting manner until a second preset condition is met; forming a second water-resisting cushion after the second slurry is solidified; grouting third slurry onto a top of the first water-resisting cushion in an upward grouting manner until a third preset condition is met; forming a third water-resisting cushion after the third slurry is solidified; wherein the third water-resisting cushion is located on the top of the first water-resisting cushion.

Abstract: In the present invention, a multi-stage foam sound-absorbing black body material is provided for the first time. A graphene aerogel is introduced into a commercialized polymer foam skeleton by using a solvent plasticizing and foaming technology, so as to embed ultra-thin graphene drums in the foam skeleton. When sound waves enter the foam black body, a large number of graphene drums generate a severe resonance effect, thereby rapidly achieving attenuation of the sound waves, and combined with the friction loss of the porous structure of the polymer foam on the sound waves, excellent sound-absorbing performance is achieved in a wide frequency range. The present solution is provided on the basis of commercialized foam materials, has a simple method, low costs, and the potential of wide industrial application.

Abstract: A sealing method for a drilled hole in three zones of overburden comprises: blocking the fissure zone and the caving zone with at least one filling bag; and transporting prepared cement slurry to the drilled hole through a hollow drill pipe, so as to block the curved subsidence zone. The three zones of overburden comprise a fissure zone, a caving zone and a curved subsidence zone.

Abstract: The present invention provides a method for preparing an aerogel based on plasticizing and foaming with solvent, and the aerogel material is prepared through plasticization with solvent and generation of in-situ bubbles. The method solves the difficult problem that the non-polymer is difficult to realize thermoplastic foaming, and has wide applicability. In addition, a lot of foaming agents can be uses for this method, and this method is easy to implement, and does not require a special drying process, so that the industrialization development of the porous aerogel is greatly promote.

Abstract: The present disclosure provides an integrated design building block with turnable modules inside, the building block comprising: a lower housing, an upper housing, and a plurality of turnable modules mechanism, the lower housing and the upper housing being fitted to form a plurality of receiving spaces, the plurality of turnable modules being disposed within the plurality of receiving spaces, respectively, wherein the turnable modules may be partially or completely received in the receiving spaces, the turnable modules each having a turnable module connection portion; the lower housing and the upper housing are fitted to form a body structure of the building block; a plurality of connection portions are provided on surfaces of the body structure; the turnable module connection portions are fitted to the plurality of connection portions on the surfaces of the body structure. The building block provided by the present disclosure has advantages of a simple mechanical structure and a low cost.

Abstract: Disclosed are a preparation method for a graphene aerogel array sensor and use thereof. A miniature graphene aerogel array device is prepared by combining in-situ printing and solvent plasticization and foaming, which has excellent flexibility and stability, and is suitable for use in a variety of scenarios, such as sensors, and energy storage devices, etc. The array sensor provided in the present disclosure exhibites extremely high stability, high accuracy and reliability. Combining with deep machine learning, the array sensor can be endowed with the function of learning and recognition of machine intelligence, thus greatly promoting the development of the next generation of artificial intelligence.

Abstract: In an example method, a mobile device connects a voice call for a user. The voice call causes one or more radio frequency transmitters of the mobile device to transmit radio waves at a first power level. Motion data describing movement of the mobile device is obtained, and the orientation of the mobile device is determined based on the motion data. A determination whether the mobile device is on the user's body or on an inanimate object is made based on the orientation of the mobile device over the period of time. The transmit power level is adjusted based on the determination.

Abstract: A rigid-collision-free transmission line spacer clamp connection structure includes a spacer frame, rotating joint rubber gaskets and spacer connecting clamps, the spacer frame being uniformly provided with a plurality of rotating joint slots that are rotationally connected with spacer connecting clamps, adopting a “spacer frame, rotating joint rubber gasket and spacer connecting clamp body tail” connection form. The spacer connecting clamp has a connecting rod and a clip, the connecting rod being provided with a connecting rod mounting hole at a rear end and the rotating joint slot being provided with a rotating joint rubber gasket and a spacer connecting clamp rotating shaft therein. The spacer connecting clamp rotating shaft penetrates through the connecting rod mounting hole and a rotating joint rubber gasket mounting hole.

Abstract: The present disclosure provides an integrated design building block with turnable modules inside, the building block comprising: a lower housing, an upper housing, and a plurality of turnable modules mechanism, the lower housing and the upper housing being fitted to form a plurality of receiving spaces, the plurality of turnable modules being disposed within the plurality of receiving spaces, respectively, wherein the turnable modules may be partially or completely received in the receiving spaces, the turnable modules each having a turnable module connection portion; the lower housing and the upper housing are fitted to form a body structure of the building block; a plurality of connection portions are provided on surfaces of the body structure; the turnable module connection portions are fitted to the plurality of connection portions on the surfaces of the body structure. The building block provided by the present disclosure has advantages of a simple mechanical structure and a low cost.

Abstract: The present disclosure provides methods and apparatuses for recommending applications and presenting recommended applications, wherein the method of recommending applications in a network device comprises: obtaining a user's current scenario information from a user equipment; determining to-be-recommended applications according to the user's current scenario information and historical application usage information of one or more users; and sending relevant information of the to-be-recommended applications to the user equipment. According to one embodiment of the present disclosure, applications to currently opened will be recommended to the user more accurately, and the user's operation path will be shortened, thereby bring a better user experience.