69results about How to "Constant size" patented technology

Apparatuses, systems, and methods for optimal group key (OGK) management that may achieve non-colluding and/or the storage-communication optimality are disclosed. In some embodiments, a group controller (GC) is responsible for key generation and distribution and the group data are encrypted by a group key. When joining the group, in some embodiments, each group member (GM) is assigned a unique n-bit ID and a set of secrets, in which each bit is one-to-one mapped to a unique secret. Whenever GMs are revoked from the group, in some embodiments, the GC will multicast an encrypted key-update message. Only the remaining GMs may be able to recover the message and update GK as well as their private keys. The disclosed OGK scheme can achieve storage-communication optimality with constant message size and immune to collusion attack and also may outperform existing group key management schemes in terms of communication and storage efficiency.

The invention provides a method for generating an electronic map. The method includes a data collecting procedure, a data storage procedure and an electronic map displaying procedure, wherein the data collecting procedure includes a step of collecting vector data and additional data corresponding to the vector data; the data storage procedure includes the steps of storing the collected vector data and the collected additional data in a server database, enabling the vector data corresponding to different types of main body elements to be stored in a plurality of layers, and enabling the vector data of each type of main body elements to be stored in one layer; the electronic map displaying procedure includes the steps that an electronic map displaying end obtains the vector data and the additional data from a server, draws vector diagrams corresponding to each layer of vector data layer by layer according to the vector data in each layer, and adds the additional data related to main body element identification data (ID) in the layer of vector data, and consequently the electronic map is generated in a displaying device.

The invention relates to an exciter whole-process two-phase alternating-current excitation control method for the starting stage of an aviation tertiary brushless starting power generation system based on a two-phase exciter. In the motor starting process, an exciter adopts two-phase alternating-current excitation in the whole process. The amplitude of a modulation voltage vector is determined through exciter excitation current closed-loop control, and the phase angle of the modulation voltage vector is determined through motor speed reference. When the method of the invention is applied to the starting stage of a tertiary brushless synchronous starting power generation system, the size of the excitation magnetic field of the exciter can be kept constant, and the speed of a rotor armature winding relative to the excitation magnetic field can be kept constant. Finally, the excitation current of a main generator can be kept constant in the whole motor starting process, and the complexity of main generator variable-frequency starting control is reduced.

The invention discloses torch soldering equipment which is used for linearly moving on a rail and is used for soldering the U-shaped tube of an all aluminum heat exchanger. The equipment is composed of an electric control unit, a material feeding area, a welding and heating area, a blanking area and a pneumatic control unit. Under the condition that liquefied petroleum gas (LPG), air, cooling water, a power supply and the like are switched on as required, the existing product specification (technological parameters, such as chosen transmission link speed, flame size and the like) is chosen, and then, ignition is carried out to start a conveyor, and a conveying chain is operated under a constant speed. Workpieces (parts and welding rings which are assembled as required) which need to be welded are continuously put in the material feeding area to a conveying link plate; products are conveyed to two sides of a welding area by the conveying link plate automatically at a constant speed to be heated and welded by symmetrical fire row flames; then the products are conveyed to the blanking area; and the products are continuously unloaded from a conveying link in the blanking area and simultaneously a welding effect is monitored.

Method for the production of a coarse-grained ammonium sulphate product by crystallization and installation for carrying out the method. A method for the continuous production of a coarse-grained ammonium sulphate product from an ammonium sulphate solution in a crystallizer operates in accordance with the DTB principle and has an internal suspension circuit and a clarifying zone, from which a clarified partial flow of solution is constantly drawn off into an external circuit, is heated in a heat exchanger so as to dissolve the solids contained therein and is then guided back as a clear solution into the lower region of the crystallizer. In order to ensure production of a product crystallizate with a grain coarseness which is practically constant over time, a fine crystal suspension flow may be drawn off from the clarifying zone as a further partial flow and guided back into the internal circuit of the crystallization stage without any previous dissolution of the solid proportion contained therein.

The invention belongs to the technical field of information security, and discloses an online and offline aggregated signature method based on identity and constant signature length. The method is divided into an online stage and an offline stage, pre-computation of a signature is performed in the offline stage, and the signature is generated according to a message and a user identity ID based on a computation result of the offline stage and verified at a receiving side in the online stage; when a user further signs the message, pre-computation of the signature of the offline stage does not need to be performed again, and computation directly starts from the online stage to generate the signature. The signature is performed in the online and offline stages, just once computation is needed in the offline stage, when the user further signs the signature, generation of the signature only needs to start from the online stage; when the user signs the plurality of messages, the length of the finally generated signature is not increased along with the number of the messages, the short and constant length is always kept, and thus signature speed and transmission efficiency are improved; the method is simple and strong in practicability, and has a popularization function.

An electronic component and method for manufacturing thereof allow efficient separation of a mother substrate into electronic components defining individual devices. The method includes forming a conductive layer including electrodes and pads for a plurality of devices, an insulating layer that partially covers the conductive layer and that includes pad openings surrounding the pads and exposing at least central portions of the pads, and power supply lines that connect the pads of neighboring ones of the devices in the mother substrate. Power is applied to the power supply lines, and electrolytic plating is performed. Thus, plating layers are formed in the pad openings. Subsequently, external terminals are formed on the plating layers. By cutting the mother substrate, the mother substrate is separated into individual components defining electronic devices. Divided surfaces of the plurality of power supply lines are formed on each of the components so as to be separated from one another.

In an optical input device based on movement of an object (15) and the device relative to each other and which comprising at least one optical sensor unit including a laser (3) having a laser cavity for generating a measuring beam (13), converging means (50) for converging the measuring beam in an action plane and for converging measuring beam radiation reflected by the object in the laser cavity to generate a self-mixing effect in the laser and measuring means for measuring the result of the self-mixing effect, which effect is determined by said movement, the converging means (50) is adapted to provide a self-mixing effect that is smaller than a possible maximum but larger than a detection threshold for an extended range of distances (ΔZ) between the object and the device. This allows obtaining the required self-mixing effect in an extended range of distances between the object and the device.

A multiband phased array antenna includes a substrate, and dipole element arrays extending outwardly from an imaginary center point on the substrate. Each dipole element array includes dipole antenna elements arranged in an end-to-end relation and having a dipole size different than a dipole size of dipole antenna elements of at least one other dipole element array. A ground plane is adjacent the dipole element arrays and has a different spacing therefrom in an outward direction from the imaginary center point. The different spacing between the ground plane and the dipole element arrays increases from the imaginary center point towards an edge of the substrate.

An image forming apparatus includes a latent image carrier on which a latent image is formed; and a line head. The line head includes light-emitting elements arranged in a first direction; an aperture diaphragm; and an optical system that images light emitted from the light-emitting elements on a latent image carrier. The aperture diaphragm and the optical system are arranged in a second direction that is orthogonal to or substantially orthogonal to the first direction; and among the lenses included in the optical system, a lens located at the position closest to the aperture diaphragm is a multifocal lens.

The invention provides inflatable nano microvesicle high-ash coal slime flotation equipment. The inflatable nano microvesicle high-ash coal slime flotation equipment comprises a main flotation columnand two secondary flotation columns, the main flotation column comprises an agent box, an ore pulp preprocessor, a high-speed disperser and a delivery pump which are mounted outside the main flotationcolumn, and an ore pulp multi-spot distributor mounted on the main flotation column, a foam collecting device, an atomizing spraying device, a bubble generator surrounding the outer wall of the lowerportion of the main flotation column, a conveying air pipe, an air storage tank and an air compressor are further included. The main flotation column and the secondary flotation columns are adopted for sequentially selecting concentrate, middlings and tailings are removed, and clean coal products with the ash content of 11% or below are finally obtained.

The invention belongs to the technical field of mechanical timing, and particularly relates to a rotary gravity type clocked trigger. The rotary gravity type clocked trigger comprises a shaking spring, a top cover, a shaking ring, a shell body, a bottom plate, a volute spiral spring, a triggering column and a gravity plug, wherein a fluid oil exists in the shell body, a hydraulic hole is formed in the gravity plug, and the hydraulic oil flows through the hydraulic hole of the gravity plug when the gravity plug moves from the upper part to the lower part; when the gravity plug is close to the bottom plate, a drive stirring block and a driven stirring block are contacted and collide to promote the triggering column to start rotating so as to trigger an outside mechanism. When a timer is shaken, the shaking ring is driven by the external force to swing up and down in a reciprocating manner, then the gravity plug starts to move downwards, and the timing is started. As the hydraulic oil has the effects of lubricating and isolating air from the gravity plug, the gravity plug and the shell body do not have the changes of oxidation or precision, then the timer has the effect of long service life; as no electric power takes part, the range of application is also quite extensive. The rotary gravity type clocked trigger has a better use effect.

A rotary bolt hole eddy current inspection scanner using a differential eddy current probe, the circuitry of the scanner is embodied with a filtering circuit with three filters: FIR (Finite Impulse Response), a low pass filter, and a phase control filter (by means of a Hilbert transform). The result from a scan of a bolt hole is an output signal on an impedance plane exhibiting a “backwards 6” shape of stable size when the scanner changes its rotating rate significantly.

A method of printing droplets using capillary electric charge concentration includes: providing a capillary nozzle comprising a back-end part and a front-end part disposed substantially opposite the back-end part; spacing a target member apart from the front-end part of the capillary nozzle at a predetermined distance; immersing the back-end part in a solution; and supplying a voltage to the solution. The back-end part transmits the solution to the front-end part.

The invention relates to an electric fluid pump which may include a pump housing and an electric motor arranged therein. A rotor of the electric motor may have a rotor shaft and may be mounted in a rotatable manner in a stator body, which may have a stator embedded at least regionally therein. The pump housing may be subdivided into a dry region and a wet region containing the rotor. The rotor shaft may be mounted on a bottom side in the pump housing and may project out of an aperture on a pump-impeller side facing away from the bottom side. In addition, the rotor shaft may be connected in terms of drive to a pump impeller. According to the invention, the pump housing may have an internal first bearing collar arranged around the aperture, wherein the dry region may be located radially around the first bearing collar, and wherein an outside diameter of the first bearing collar may be less than a maximum diameter of the rotor. The invention also relates to a method for assembling the fluid pump.