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259results about How to "Few constraints" patented technology

Sublevel shrinkage caving stage open stope afterwards filling mining method

The invention discloses a sublevel shrinkage caving stage open afterwards filling mining method. In the earlier stage of stoping, caved ores are utilized to support surrounding rocks on a top tray, and in the later stage of stoping, a goaf area is filled with fillers to control ground pressure so as to achieve safe and efficient mining. Ore blocks are mined in two steps, mining blocks in step two are stoped after the mining blocks in step one are stoped and filled. After the ores are completely let out, the goaf area is filled with the fillers to control the ground pressure. Because the stoping modes of sublevel ore caving, sublevel shrinkage, final ore drawing and empty area afterwards filling are adopted, the mining method has large one-time filling amount and low cost; the method adopts middle-deep hole drilling and blasting and carry scraper ore removal, and the device has high level and large production capacity; the method has the advantages of large production capacity of the sublevel caving method and the stage open stope method, high recovery rate of the filling method, and earth surface protection; the safety is good, and drilling, ore removal and other operations are all carried out in a sublevel drilling and ore removal approach roadway; and the ores can be removed in advance, and the ores can be removed partially after the first sublevel is ready.
Owner:NORTHEASTERN UNIV +1

Controlled flight of a multicopter experiencing a failure affecting an effector

According to a first aspect of the invention, there is provided a method for operating a multicopter experiencing a failure during flight, the multicopter comprising a body, and at least four effectors attached to the body, each operable to produce both a torque and a thrust force which can cause the multicopter to fly when not experiencing said failure. The method may comprise the step of identifying a failure wherein the failure affects the torque and/or thrust force produced by an effector, and in response to identifying a failure carrying out the following steps, (1) computing an estimate of the orientation of a primary axis of said body with respect to a predefined reference frame, wherein said primary axis is an axis about which said multicopter rotates when flying, (2) computing an estimate of the angular velocity of said multicopter, (3) controlling one or more of said at least four effectors based on said estimate of the orientation of the primary axis of said body with respect to said predefined reference frame and said estimate of the angular velocity of the multicopter. The step of controlling one or more of said at least four effectors may be performed such that (a) said one or more effectors collectively produce a torque along said primary axis and a torque perpendicular to said primary axis, wherein (i) the torque along said primary axis causes said multicopter to rotate about said primary axis, and (ii) the torque perpendicular to said primary axis causes said multicopter to move such that the orientation of said primary axis converges to a target orientation with respect to said predefined reference frame, and (b) such that said one or more effectors individually produce a thrust force along said primary axis.
Owner:ETH ZZURICH

Power conversion control with energy storage

A power generation system includes a renewable power source for producing source power; a source side converter for converting the source power to converted DC power; a source side controller for driving the converted DC power towards a maximum power point; a DC link for receiving the converted DC power; a grid side converter coupled to the DC link for converting DC link power from the DC link to AC output power for a grid; a grid side controller for controlling the AC output power of the grid side converter to achieve grid interconnection requirements; an electrical energy storage device; an energy storage converter coupling the energy storage device to the DC link; an energy storage controller for controlling the energy storage converter to achieve a desired power balance on the DC link.
Owner:GENERAL ELECTRIC CO

Controlled flight of a multicopter experiencing a failure affecting an effector

According to a first aspect of the invention, there is provided a method for operating a multicopter experiencing a failure during flight, the multicopter comprising a body, and at least four effectors attached to the body, each operable to produce both a torque and a thrust force which can cause the multicopter to fly when not experiencing said failure. The method may comprise the step of identifying a failure wherein the failure affects the torque and / or thrust force produced by an effector, and in response to identifying a failure carrying out the following steps, (1) computing an estimate of the orientation of a primary axis of said body with respect to a predefined reference frame, wherein said primary axis is an axis about which said multicopter rotates when flying, (2) computing an estimate of the angular velocity of said multicopter, (3) controlling one or more of said at least four effectors based on said estimate of the orientation of the primary axis of said body with respect to said predefined reference frame and said estimate of the angular velocity of the multicopter. The step of controlling one or more of said at least four effectors may be performed such that (a) said one or more effectors collectively produce a torque along said primary axis and a torque perpendicular to said primary axis, wherein (i) the torque along said primary axis causes said multicopter to rotate about said primary axis, and (ii) the torque perpendicular to said primary axis causes said multicopter to move such that the orientation of said primary axis converges to a target orientation with respect to said predefined reference frame, and (b) such that said one or more effectors individually produce a thrust force along said primary axis.
Owner:ETH ZZURICH

Method for manufacturing electric equipment through combination of 3D printing and traditional manufacturing technology and purpose thereof

ActiveCN104117674AFew constraintsHigh degree of manufacturing flexibilityFree formElectric equipment
The invention discloses a method for manufacturing electric equipment through combination of 3D printing and a traditional manufacturing technology and a purpose of the method. Firstly, a three-dimensional CAD model of parts is generated in a computer; then, the model is sliced into layers according to a certain thickness, three-dimensional information of the parts are converted into a series of two-dimensional contour information, and metal is molten through a crucible, and formed molten drops flow out of a nozzle; then, under control of the computer, the molten drops are stacked layer by layer according to the two-dimensional contour information, and three-dimensional solid parts or similar-shape parts are obtained. By means of the method, all designs are achieved in the computer, the actual manufacturing process is carried out under the control of the computer, the advantages of digital, intelligent and paperless manufacturing are really achieved, a complex three-dimensional structure can be directly formed, constraint conditions in the part design and manufacturing processes in the traditional technology are reduced, and the method is a new development direction in the constraint-free forming technology.
Owner:STATE GRID CORP OF CHINA +3

Controlled quantum safe and direct communication method and system for preventing tampering

The invention belongs to the technical field of safety communication, and discloses a controlled quantum safe and direct communication method and system for preventing tampering. A receiving end is controlled to obtain secret information of a sending end, and the sending end sends SC* to a control end; the control end disorganizes photons in SC*; then the control end sends rearranged SC* to the receiving end; if the control end does not tell the accurate sequence of the photons to the receiving end, the receiving end cannot resume SC and decrypt the secret information; the control end cannot know the secret information encrypted through K(k1, k2, ..., kN). The premise that a controller is honest is not needed; even under the condition that the controller is dishonest, the proposed protocolis still safe, and any tampering of the secret information can be easily found. By means of the controlled quantum safe direct communication method and system for preventing tampering, attack of fakephotons based on quantum teleportation can be resisted, and meanwhile, identities of two participants, namely, the sender and the receiver, can also be verified.
Owner:武汉飞信云科技有限公司

Placement of an antenna in a wrist worn device

A wrist worn device having a main body portion and a strap portion. The main body portion comprises a housing for housing a processor, communication circuitry, a screen and tin antenna. The strap portion comprises a strap for attaching the main body portion to a wrist. The housing comprises a central portion that supports the screen and edge portions arranged around the central portion, one of the portions comprising a non-conductive section on an outer surface of said wrist worn device facing away from said wrist when worn; wherein the antenna is supported within the housing in the one of the edge portions comprising the non-conductive section, such that there is an electromagnetic wave path from the antenna to the outer surface through at least a portion of the non-conductive section wherein a portion of the strip overlays the antenna and a portion of the non-conductive section at the outer surface, the portion of the snap comprising a non-conductive portion.
Owner:ARM IP

Formwork system of shear walls at two sides of extensible seam

The invention discloses a formwork system of shear walls at two sides of an extensible seam. The formwork system of the shear walls at the two sides of the extensible seam comprises two sets of wall body pouring formworks arranged symmetrically with the extensible seam as a symmetric axis, side face fastening steel tubes and end portion fastening steel tubes, wherein, the side face fastening steel tubes and the end portion fastening steel tubes are used for fixing the wall body pouring formworks. Each set of the wall body pouring formwork is respectively enclosed by an outer side formwork, an inner side formwork and an end portion formwork. A support block is respectively arranged between the outer side formwork and the inner side formwork in each set of the wall body pouring formwork and each outer side formwork and each inner side formwork are fastened through each transverse fastening steel tube, each side face fastening steel tube and a split bolt. Each end portion formwork is pressed on each outer side formwork and each inner side formwork through the end portion fastening steel tubes, bolt rods and match of end portion movable nuts on the bolt rods. According to the formwork system of the shear walls at the two sides of the extensible seam, the formworks at the two sides of the extensible seam can be erected by once in a narrow space, construction period is greatly shortened, engineering cost is reduced, and the formwork system is not limited by the size of the extensible seam and particularly applicable to the condition that the extensible seam is small.
Owner:QINGDAO BOHAI CONSTR GROUP

Network topology discovering method facing to data link layer

The method includes steps: based on address of gateway to be discovered to obtain current active IP address corresponding to the gateway, sorting IP addresses according to sub networks; determining types of devices corresponding to IP addresses in current sub networks to find out exchangers in current sub network, grouping exchangers in current sub network according to each port of exchanger; determining root exchanger related to gateway to be discovered, and using structure of tree type graph to save relation of connection between the root exchanger and the gateway to be discovered; determining and saving topology positions of other exchangers in current sub network, and converting topology positions in tree type graph to tree structure. The technical scheme disclosed in the invention is not dependent on protocol of spanning tree. Features are: less constraint condition of initial request, quick speed, and saving space occupied.
Owner:TSINGHUA UNIV +1
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