An apparatus to quickly position a start assist device for backstroke swimmers and remove said start assist device once the apparatus detects or is signaled that the swimmer has left to prevent injuries and obstructions caused by the start assist device. A mechanical embodiment of such an apparatus and a motorized embodiment of such an apparatus with a data input system to position the start assist device according to the individual swimmers needs and means to signal the start event are disclosed.

A hand-held manually-accelerated yo-yo, comprising two rotating bodies (1), a button (2) mounted at the middle of the outside of one of the rotating bodies (1), a side shaft cap (3) mounted at the middle of the outside of the other rotating body (1), a manual acceleration structure disposed inside the rotating bodies (1) and connecting the rotating bodies (1) together, forming one body, and a bearing (4) for winding a string, located between the two rotating bodies (1); the two ends of the manual acceleration structure are connected to rotating bodies (1), and by means of pressing button (2), the manual acceleration structure drives rotating bodies (1) to rotate in unison. The yo-yo is widely adaptable and meets the play needs of a majority of children; at the same time, more ways of playing with the yo-yo are possible, it is very fun and interesting, and the user has room to exercise creativity in play.

A hand-held electrically-accelerated yo-yo, comprising two rotating bodies (1), a connector (2) connecting the two rotating bodies (1) together, forming one body, side bushings (3) mounted at the middle of the outsides of the two rotating bodies (1), an electric acceleration mechanism disposed inside the rotating bodies (1), and a bearing (4) for winding a string, located between the two rotating bodies (1). The electric acceleration mechanism is connected to the two rotating bodies (1), and by means of pressing side bushing (3), the electric acceleration mechanism operates, thus driving the two rotating bodies (1) to rotate in unison. By means of pressing the side bushing (3), the rotating bodies (1) are rotationally accelerated; when the rotational speed is sufficient, pulling on the string releases the yo-yo body; a user has adequate time to make various movements; therefore, even if a user is relatively short in height, the user can play with the yo-yo. The yo-yo can be accelerated again while rotating at a low rotational speed. If the side bushing (3) is loosened, the electric acceleration mechanism ceases operation; the body continues to rotate due to the effect of inertial force, and is thus very fun and interesting. The yo-yo is widely adaptable and meets the play needs of a majority of children.

A computer-implemented method for providing filtered geospatial assets may include providing access to a reference geospatial asset including geospatial data and receiving a filter request to associate a filter with the reference geospatial asset. The filter request may include at least one filter parameter associated with limiting access to a portion of the geospatial data. In addition, the method may include receiving an access request to access a filtered version of the reference geospatial asset using an access point associated with the filter and applying the filter to the reference geospatial asset to generate the filtered version of the reference geospatial asset. The filtered version may provide access to only a portion of the geospatial data contained within the reference geospatial asset.

This mining-machinery management system is provided with: a vehicle capable of travel in a mining site; a first antenna for receiving a radio wave from a GPS satellite, and positioned on the vehicle; a second portable antenna for receiving a radio wave from a GPS satellite, and detachably mounted on the vehicle; a first detection device for detecting the position of the first antenna on the basis of a signal from the first antenna, and positioned in the vehicle; a second detection device for detecting the position of the second antenna on the basis of a signal from the second antenna, and positioned in the vehicle; and a processing device for setting a prohibited region for prohibiting an intrusion of the mining machinery capable of travel in the mining site, so as to include the position of the first antenna and the position of the second antenna, on the basis of the detection results from the first detection device and the detection results from the second detection device.

This mining-machine management system is equipped with: a landmark which makes it possible to detect the relative position therefrom of a mining machine by using a contactless sensor disposed on the mining machine which is located in a mining site and capable of travel in the mining site; a storage device for recording the landmark position detected by using an omnidirectional measurement system; and a processing device for, when recording, setting a prohibited region for prohibiting an intrusion of the mining machine so as to include the position of the landmark.

Embodiments of the present invention provide a data sending method, a data receiving method and a storage device. The method comprises: a first storage device receiving a first data write request sent by a host, the first data write request carrying data to be written and address information; attaching a first serial number to the data to be written and the address information, and writing the data to be written and the address information into a cache, the first serial number being the serial number of the current time period; reading from the cache the data to be written and the address information corresponding to the first serial number; modifying the serial number of the current time period to mark information carried by a subsequent data write request; and sending the data to be written and the address information to a second storage device. The data replication efficiency is improved.

Disclosed are a battery box (4) for an electric skateboard and the electric skateboard using the battery box (4). The battery box (4) comprises a bottom board portion (41) and two side board portions (42) facing each other and extending from the bottom board portion (41); and each of the side board portions (42) is provided with at least one opening (40), and an elastic element (44) is arranged in the opening (40). The electric skateboard comprises a main carrying board (1), wheels (2) mounted at the two ends of the main carrying board (1), an electric motor (3) mounted on the underside of the main carrying board (1) and the battery box (4), the battery box (4) being mounted on the underside of the main carrying board (1).

An inorganic cured foam material for surface leaking stoppage in shallow coal seam mining areas and a preparation method thereof. The leaking-stoppage cured foam comprises water, coal ash, slaked lime, cement, ox horn powder, aluminium powder, copper oxide, polyphosphoric acid, aluminium hydroxide, hydroxypropyl methyl cellulose, and steel fibres. The preparation method comprises coal ash, cement, hydroxypropyl methyl cellulose,steel fibres and slaked lime being added into water to form a coal ash base slurry; an ox horn powder is added into a small amount of water to form a prefabricated viscous liquid under stirring, and the coal ash base slurry and the prefabricated viscous liquid are fully stirred to form a mixed liquid; an inorganic adhesive system is added into the mixed liquid and fully stirred, forming a mixed adhesive; and an aluminium powder is added therein and fully mixed, the slurry is foamed using an inorganic self-foaming system, and prepared into an inorganic cured foam material for surface leaking stoppage in shallow coal seam mining areas.

A system for automatically adjusting tension of guide ropes of a flexible cable suspended platform comprises guide rope adjusters (3) installed on the flexible cable suspended platform (1) and connected to the guide ropes (2), a hydraulic power unit (5) disposed on the flexible cable suspended platform (1), and a matched hydraulic system. Further disclosed is a method for adjusting tension of guide ropes of a flexible cable suspended platform. The guide rope adjusters (3) can automatically adjust tension of the guide ropes (2) with assistance of the hydraulic system, so that tension of each guide rope (2) is consistent, which ensures that the flexible cable suspended platform is in a horizontal state, and a tensioning state of each guide rope can be measured, so as to ensure that the guide ropes have sufficient tension to limit a swinging amplitude when a lifting container works.