1024 results about "Tetrahedron" patented technology

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.

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 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.

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).

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.

Separation of a color into values for colorants in colorant space can be done easily when color correction and color separation are done in a separate step. To perform color separation the color can be defined as a set of values in a trajectory space wherein trajectories are defined comprising points for which ink behavior during color separation is known. Colorant values for the color can be determined using simple interpolation techniques based upon values of the color located in trajectory space, known values and corresponding colorant values of the trajectory points. Trajectories are preferably color axes dividing the trajectory space into tetrahedra. Obtained colorant values may be further corrected using techniques such as colorant replacement or colorant splitting. A color correction step can be done previous to the color separation step. The combined process can be calibrated using a test target.

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.

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.

Semiregular or irregular polyhedron-based puzzles have at least two different types of faces. The dividing method used to create the puzzles requires that bisecting planes parallel to the faces be chosen to exclude at least one type of face. Preferably, the base polyhedron has a Buckyball (soccer ball) shape. Applying this dividing method to a Buckyball polyhedron results in (i) a center element with six axes passing through geometrical centers of pentagonal faces, (ii) twelve pentagonal rotating elements, and (iii) thirty mobile elements of tetrahedral shape. The mobile elements are exchangeable between adjacent groups. In another embodiment, sliding elements are superimposed over the mobile elements to enable sliding motion in addition to shifting/rotating motion. Different indicia patterns can be used to modulate the difficulty level of the puzzle. The same dividing method can be used on a sphere to obtain a completely spherical puzzle.

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.