1033 results about "Tetrahedron" patented technology

A method of imaging an object that includes directing a plurality of x-ray beams in a fan-shaped form towards an object, detecting x-rays that pass through the object due to the directing a plurality of x-ray beams and generating a plurality of imaging data regarding the object from the detected x-rays. The method further includes forming either a three-dimensional cone-beam computed tomography, digital tomosynthesis or Megavoltage image from the plurality of imaging data and displaying the image.

An electromagnetic tracking coil arrangement, comprising three co-planar electromagnetic sensors and a fourth electromagnetic sensor that is not co-planar with the three co-planar sensors, wherein the three co-planar electromagnetic sensors and the fourth electromagnetic sensor are each located at a vertex of a tetrahedron.

An omni-directional aircraft with flight capabilities surpassing those of a regular VTOL or helicopter, being able to take full advantage of the simultaneous six degrees of freedom of motion possible in the atmosphere, undergoing any desired combination of translational and rotational movement, and keeping station in the air in any arbitrary attitude. In the preferred embodiment, the flying object comprises a cubic body on the six faces of which are mounted six propulsion units, such that the propellers on each pair of opposite faces are coplanar with each other and with the main axis passing through the centers of these opposite faces, and their thrusts act along the direction of another main axis, each of the three pairs of propellers acting along a different one of the cube's three main axes. The thrust from each motion-inducing assembly being continuously variable and reversible, the resultant translational and rotational thrust vectors can be positioned arbitrarily within their respective solid envelopes. A control element with equal freedom of motion allows intuitive piloting of the vehicle. In an alternate embodiment, the propulsion units are disposed along the sides of a tetrahedron.

Disclosed is a geometric puzzle comprising a plurality of three-dimensional components of at least one type, each component of the same type being derived by notionally dividing a fundamental shape into a plurality of equal parts, said fundamental shape being selected from the group consisting of a regular tetrahedron having edges of equal length and a regular pyramid with a square base and also having edges of equal length, said components being capable of assembly into multiple composite shapes. Each component may be equal and identical to one another or each pair of components may comprise mirror images of one another. Surfaces of said components may be provided attractive magnetic elements to hold said components in a composite shape.

A synchronously deployable tetrahedral truss beam with orthogonally-hinged diagonals, having uniquely-connected transverse members and folding chordal members, where a plurality of bays can extend and retract in a coordinated manner without need for a deployment canister mechanism or other assembling means. The triangular cross-section truss can be adapted to deploy pre-attached panels or nodally-attached payload components. These triangular beams can be mounted side-by-side with a common chord to create a synchronously deployable trapezoidal cross-section beam or space-frame. Both the triangular and trapezoidal configurations can be adapted to deploy with a prescribed curvature of the longitudinal axis, and form perimeter trusses which can be post-tensioned for maximum structural performance.

Methods, devices and systems for teaching, learning and understanding sacred geometry concepts through magnetic modular toys comprising a plurality of triangular modular members assembled to form multidimensional hedrons and where in each triangular member includes a magnet such that adjacent members have opposite magnetic polarity facing each triangular member. Platonic solid shapes with interior magnets to hold forms together for construction of larger Platonic solids, geometry learning, and puzzle solving skills. Multidimensional hedrons include simple and small as ell as stellated tetrahedrons, octahedrons, icosahedrons and dodecahedrons.

The invention relates to an SAPO (silicoaluminophosphate) molecular sieve with an RHO skeleton structure. The molecular sieve is formed by a PO2+, AlO2- and SiO2 tetrahedron and has a three-dimensional skeleton structure, the anhydrous chemical composition can be shown as mR.(SixAly Pz)O2. The preparation process comprises the following steps of: mixing a silicon source, an aluminum source, a phosphorous source, a surfactant, a template with deionized water to obtain an initial gel mixture; moving the prepared initial gel mixture material to a synthesis reactor for airtight temperature rise and crystallization; and washing and drying a solid crystallized product to obtain SAPO molecular sieve raw powder with the RHO structure; or the preparation process comprises the following steps of: mixing a silicon source, an aluminum source, a phosphorous source with the deionized water to obtain a gel mixture; evaporating the moisture content of the gel mixture to prepare a dry gel; moving the dry gel mixture, the template and the deionized water to the synthesis reactor for airtight rotation and crystallization; and washing and drying the solid crystallized product to obtain the SAPO molecular sieve raw powder with the RHO structure.

The laser scan tracker with six-freedom measurement function comprises double-frequency laser interferometer, two-D position sensitive detection device, spectroscope, two-D rotation plane mirror and coordinate bearing measuring target. Its coordinate bearing measuring target comdprises main shaft, axial plane rotating mechsniam in upper end of the main shaft and equipped with corner cube, main shaft circumagitating mechanism positioned in middle portion of main shaft and equipped with photoelectric measuring head or hollow tetrahedron measuring head and positioing mechanism which is positioned in lower end of main shaft and is composed of measuring bar and contact ball. The outer end of rotation arm is equipped with corner cube, said rotation is controlled by positioing plate.

The invention relates to a sound source positioning device, applying sound waves to position through the match of a plurality of directions, which is a three-dimensional space sound resource object positioning device. The sound resource positioning device is composed of a hearing transducer, a sound resource signal microprocessor and an upper computer system, wherein the hearing transducer is a microphone array of a four-dimension regular tetrahedron structure; four microphones are respectively positioned on the four top points of the regular tetrahedron structure; the sound resource signal microprocessor is composed of a sound signal amplifier module, an analysis latch module and a communication transmission module; the upper computer system is composed of a positioning calculation method and peripheral equipment; and the hardware parts of each part and each module are all connected with each other through wires. The sound resource positioning device realizes accurate positioning to sound resources at any position in a three-dimensional space, is constructed into an all-around hearing scene, has the advantages of simple structure and higher precision, and has an anti-noise ability.

A haptic device for human / computer interface includes a user interface tool coupled via cables to first, second, third, and fourth cable control units, each positioned at a vertex of a tetrahedron. Each of the cable control units includes a spool and an encoder configured to provide a signal corresponding to rotation of the respective spool. The cables are wound onto the spool of a respective one of the cable control units. The encoders provide signals corresponding to rotation of the respective spools to track the length of each cable. As the cables wind onto the spools, variations in spool diameter are compensated for. The absolute length of each cable is determined during initialization by retracting each cable In turn to a zero length position. A sensor array coupled to the tool detects rotation around one or more axes.

In a negative electrode active material for a lithium ion secondary battery including a silicon oxide capable of absorbing and desorbing lithium ions, a silicon oxide having structural units each in the form of a tetrahedron in which a silicon atom is located at its center and silicon or oxygen atoms are located at its four vertices is used. The structural units are arranged randomly to form an amorphous structure. In the case that the number of oxygen atoms located at the four vertices in the structural units is represented by n (n=0, 1, 2, 3 or 4) and the structural units are represented by Si(n), the number of the structural units NSi(n) in the silicon oxide satisfies the following relations (1) to (3).[Formula1]NSi(0)∑NSi(n)≥0.1(1)Nsi(4)∑NSi(n)≤0.1(2)Nsi(1)+NSi(2)+Nsi(3)≠0(3)

The present invention is for a modeling kit in which triangularly shaped panels fit together to form the faces of either tetrahedral or octahedral modules. Centrally located in the triangularly shaped panels are face-to-face interlocking mechanisms which allow different modules to be releasably attached to each other at matching faces. Multiple interlocking modules may then be used to model complex constructs such as lattices, matrices or crystalline structures.

This invention relates to a dope combination. The film coating it formed is amorphous gelatinous substance, base unit is three-dimensional network formed by connection of silicon - oxygen tetrahedron and aluminium - oxygen tetrahedron. end product takes electrovalent bond and covalent bond as main, vander waas bond as complement, possess linkage structure of organic heavy polymer, and double property of inorganic polymer and organic polymer. The unique performance supple the insufficiency of organic high molecular polymer. It possesses favorable performance of acid-proof, alkali-proof, impervious, antifreeze, seawater resistance and high temperature resistance.

The invention discloses a fan blade based on a hollow metal / composite material structure. The inner base body of the fan blade is in a rib structure with discrete space. The fan blade comprises a hollow metal / composite material structure; the structure comprises a rib structure and inner holes; the rib structure is formed by combining and optimizing arbitrary space structures; the hole ratio is directly displayed by the space arranging mode of ribs and the rib diameter distribution; the rib structure and the surface of the blade are fixedly connected into a whole; the rib structure can be combined and optimized by a diamond structure, a tetrahedron unit structure, a hexahedron unit structure, a honeycomb structure or other arbitrary space structures; in regard to the space arrangement modeof the ribs and the rib diameter distribution, the rib diameters are gradually reduced and the space arrangement is gradually sparse following the radial increase of the blade along the radial direction of the blade; the thickness of the surface of the blade is controlled by pneumatic loads and technological conditions and the blade of the metal structure can be formed and processed quickly by high energy beams. The fan blade is directly and quickly formed and has simple technology. The structure shape has strong design performance.

The invention discloses an efficient wideband vibrating energy collector with an elastic amplifying mechanism and belongs to the technical field of new energy and power generation. The vibrating energy collector comprises a shell, the elastic amplifying mechanism, a cantilever beam piezoelectric vibrator and a spring-mass system, wherein the shell is formed in such a way that 4 lightweight metal plates are fixed between an upper end cover and a lower end cover through bolts to form a tetrahedron; U-shaped connecting seats for fixing the cantilever beam piezoelectric vibrator are arranged on the lightweight metal plates; the elastic amplifying mechanism comprises a spring element and a damping element; the elastic amplifying mechanism is fixed between a base and the shell through a bolt; the cantilever beam piezoelectric vibrator comprises an upper piezoelectric ceramic chip, a lower piezoelectric ceramic chip, a metal substrate and a magnet; the upper piezoelectric ceramic chip is bonded at the top of the metal substrate and the lower piezoelectric ceramic chip is bonded at the bottom of the metal substrate; one end of the metal substrate is fixed on the U-shaped connecting seat through a bolt; the magnet is mounted at the other end of the metal substrate; the spring-mass system comprises a tension spring, a pressure spring and mass block; one end of the tension spring is connected with the bottom surface of the upper end cover; one end of the pressure spring is connected with the top surface of the lower end cover; the other ends of the tension spring and the pressure spring are respectively connected with the mass block; the magnet is embedded on the periphery of the mass block; and reverse magnetic poles of the magnet at the end part of the piezoelectric vibrator and the magnet embedded on the periphery of the mass block are oppositely mounted. The efficient wideband vibrating energy collector with the elastic amplifying mechanism, disclosed by the invention, has the advantages that the amplitude of weak vibrating displacement of the base can be amplified, the power generating energy and conversion efficiency of the piezoelectric vibrator are increased and efficient wideband energy collection and conversion can be achieved.

The invention provides a control method of accurate landing of an unmanned aerial vehicle. The control method is used for controlling the unmanned aerial vehicle to reach a present landing point. The control method is characterized by comprising the following steps that 1 a sound source is placed at the landing point, regular-tetrahedron-shaped microphone arrays are placed on the unmanned aerial vehicle and a signal amplification circuit and a filtering circuit are arranged at the signal output end of each microphone; 2 GPS navigation is used for controlling the unmanned aerial vehicle to reach the range which is ten meters away from the landing point; 3 a processor on the unmanned aerial vehicle is used for calculating delay generated when sound source signals reach the second microphone, the third microphone, the fourth microphone and the first microphone; 4 the yaw angle and the pitch angle of the unmanned aerial vehicle are calculated through the processor according to the spatial geometric relationship of the sound source and the microphone arrays and delay values; 5 the unmanned aerial vehicle is navigated to the position over the landing point according to the yaw angle and the pitch angle; 6 an air pressure height sensor is used for enabling the unmanned aerial vehicle to be landed at the landing point accurately.

The invention discloses a curing agent capable of rapidly curing sludge at room temperature and a use method thereof. The curing agent is prepared from, by weight, 48%-70% of inorganic micro powder, 28%-50% of emulsion, 0.05%-1.8% of high-performance water-absorbent resin and 0.05%-0.5% of triethanolamine. The emulsion can react with the inorganic micro powder and activated silicon dioxide and aluminum oxide in the sludge to form a zeolite-like crystalline substance of a silicon (aluminum)-oxygen tetrahedron structure. The sludge curing agent is capable of improving the curing strength of the sludge and shortening the curing time, small in air shrinkage and good in water resistance, and dosing of materials can be particularly adjusted according to components of the sludge, so that curing of the sludge is not limited by time, the strength, the stability and the like meet the actual engineering requirements, the cost is low, pollution does not exist, and the curing agent can be widely applied and promoted.

In a method for domain decomposition for generating unstructured grids, a surface mesh is generated for a spatial domain. A location of a partition plane dividing the domain into two sections is determined. Triangular faces on the surface mesh that intersect the partition plane are identified. A partition grid of tetrahedral cells, dividing the domain into two sub-domains, is generated using a marching process in which a front comprises only faces of new cells which intersect the partition plane. The partition grid is generated until no active faces remain on the front. Triangular faces on each side of the partition plane are collected into two separate subsets. Each subset of triangular faces is renumbered locally and a local / global mapping is created for each sub-domain. A volume grid is generated for each sub-domain. The partition grid and volume grids are then merged using the local-global mapping.

The present invention discloses a system for locating wireless sensor network based on 3D space, which comprises of multiple TelosB sensor nodes, Sink nodes and user end. Wherein, each TelosB node, and each TelosB node to each Sink node are communicated by wireless type, Sink nodes and user end can communicate by Internet or USB interface. In the 3D self-localization of random target nodes Mb in wireless sensor network, location region P is screened by judging whether the random target point Mb is located in the tetrahedron formed of random four visual anchor nodes, and barycenter set of all location region P are calculated and the average coordinate value of all elements in barycenter set G is looked as coordinate location of target nodes Mb in wireless sensor network. The all orientation resolution of 3D self-localization of present invention is processed on single sensor node, so the method of present invention is a distributing orientation method.

The invention discloses an insulating refractory material of polymerized silicon and aluminum and the preparation method, applied in construction and industrial facilities, which is characterized in that: excitation, gas evolution and polymerization are carried out for industrial wastes abundant in aluminum oxide, silicon dioxide, and the complex of the silicon dioxide and aluminum oxide, so as to obtain a three-dimensional aluminum silicate minerals with an internal structure made of a plurality of phases from amorphous to semi-crystalline inside, and an internal form in silica tetrahedron and alumina tetrahedron; a plurality of molecules are linked mainly through ionic or covalent bonds, the mechanical properties of the inorganic concretion are externally presented. The raw materials are composed of silicon and aluminum materials as kaolin, fly ashes, coal gangue, cinder, and red mud; without adding any gelled materials, a high temperature and corrosion resistant porous long-chain structure is formed with an intensity over 0.8MPa and a thermal conductivity coefficient of 0.087 (kilocalorie / meter x hour x centigrade). The insulating refractory material is applied not only for the heat insulation wallboards in the building but also for the heat insulation and preservation of the industrial thermal pipelines and facilities.

Absorbent particles suitable for use as an animal litter according to one embodiment include an absorbent material formed into a general shape selected from a group consisting of: square with a flat form, rectangular with a flat form, square, rectangular, diamond, cupped, star, bagel, mesh, angled, cone, tetrahedron, pyramid, and combinations thereof. Absorbent particles suitable for use as an animal litter according to another embodiment include first absorbent particles having a first general shape and second absorbent particles having a second general shape, where the second general shape is different than the first general shape. Agitation of the absorbent particles may cause the first and second absorbent particles to segregate. Agitation of the absorbent particles may cause the first and second absorbent particles to orient with each other in a targeted way.

A large deployable reflector for an antenna suitable for being installed on board a satellite and provided with a support structure, a parabolic mirror carried by the support structure and a connection arm for mounting the support structure on the satellite; the support structure being a jointed reticulate structure that is able to assume a compact inoperative stowed configuration and an operative deployed configuration and is composed of ‘n’ elements articulated to form tetrahedrons having respective triangular bases, which are connected to each other at the axial ends of respective first sides and have respective external vertices, which are opposite to said respective first sides and, when the reflector is arranged in the deployed configuration, ideally lie on a cone tangent to the parabolic mirror.

The present invention provides a MIMO antenna structure and design. A single dipole antenna stands at the center of a triangle which is formed by three PIFAs antennas, and the three PIFA antennas has equal squint angle relative to the neighbors, that is there is 120° sector angle between any two PIFA axes of three such that the dipole and the other PIFAs forms a tetrahedron. The MIMO antenna structure of the present invention is simpler in mechanics but high efficiency in performance.

An orthopedic device having a protective coating bonded to the substrate material of the device. The protective coating includes a thin layer of tetrahedral bonded Carbon (ta-C). The substrate also optionally includes an interface layer to facilitate the initial bonding and retention of the ta-C layer. The ta-C layer has a concentration of sp3 bonded carbon which varies through its thickness, such as varying in individual layers forming the protective coating. The protective coating may also be doped with various materials, either through its thickness, or at either an inner or an outer interface, or both, or include ion diffusion barriers.

The invention discloses a rapid autonomous all-sky map fixed star identification method which comprises the following steps: (1), generating a navigation star diagonal pitch table according to a visual field of a star sensor; (2), sequencing all observation stars according to energy; (3), constructing an observation star triangle by using a novel triangle selection method; (4), performing triangle matching identification on the observation star triangle based on an improved K vector method; (5), if a triangle matching identification result is unique, calculating a current gesture and carrying out projection verification, if the result is not unique, performing tetrahedron identification, if a tetrahedron identification result is unique, calculating a gesture and carrying out projection verification, and if the result is not unique, re-selecting observation stars to form a tetrahedron for performing matching identification; and (6), performing projection verification on the identified unique result according to the calculated gesture, and if the projection verification is passed, indicating that the identification is successful. The rapid autonomous all-sky map fixed star identification method has the advantages of saving storage space, reducing star map identification time and increasing identification accuracy, and is great in practical value.

Disclosed is an aircraft, configured to have a wide range of flight speeds, consuming low levels of power for an extended period of time, while supporting a communications platform with an unobstructed downward-looking view. The aircraft includes an extendable slat at the leading edge of the wing, and a reflexed trailing edge. The aircraft comprises a flying wing extending laterally between two ends and a center point. The wing is swept and has a relatively constant chord. The aircraft also includes a power module configured to provide power via a fuel cell. The fuel cell stores liquid hydrogen as fuel, but uses gaseous hydrogen in the fuel cell. A fuel tank heater is used to control the boil-rate of the fuel in the fuel tank. The fuel cell compresses ambient air for an oxidizer, and operates with the fuel and oxidizer at pressures below one atmosphere. The aircraft of the invention includes a support structure including a plurality of supports, where the supports form a tetrahedron that affixes to the wing.

The invention discloses a method for detecting miRNA (ribonucleic acid). The method comprises the steps: (1) synthesizing a DNA (deoxyribonucleic acid) tetrahedron probe; (2) connecting three peak points of the DNA tetrahedron probe to the surface of a working electrode of an electrochemical device to obtain a working electrode with a capture probe; (3) adding a target miRNAs to be detected, a signal probe and an auxiliary chain into a reaction system to implement hybridization reaction to form a composite body I, and immersing the working electrode into the reaction system to implement hybridization reaction to form a composite body II; (4) generating reaction between the composite body II and enzyme capable of generating catalytic oxidation reduction reaction; (5) adding a primer produced by the enzyme catalytic oxidation to realize electrochemical detection analysis. The target miRNAs can be directly detected by the method disclosed by the invention without being marked and subjected to pre-PCR (polymerase chain reaction) multiplication; the method is easy to operate, so that the experiment cost is greatly reduced, and the experiment efficiency is improved.