41 results about "Angular stability" patented technology

A bone plate system for osteosynthesis comprises a bone plate, a swivel screw, a clamping screw, a swivel hole formed in the bone plate as a through hole for receiving the swivel screw polyaxially, and a clamping hole, which is associated with the swivel hole and is formed in the bone plate as a further through hole for receiving the clamping screw. When the swivel screw and the clamping screw are screwed in, they are fixed with angular stability in multiple dimensions, as the screw heads of the swivel screw and of the clamping screw are secured by one another and by the bone plate against relative movement. The swivel screw and the clamping screw are each designed as a bone screw.

An airborne system for producing electricity from wind energy includes a shaft, wind turbines rotatably mounted to the shaft and arranged to rotate independently in opposite directions when subjected to the same wind, and generators arranged to convert rotation of the turbines into electricity. A lifting section includes combination of kites and lighter than air balloons, generating a lifting force that caused the system being airborne at desire altitude. The center of gravity of the system is lower than the center of lift of the system; when the turbines of the system exposed to wind and start to rotate, torques are inducing on the shaft of the system; these torques are balancing each other and the remaining deferential torque being balanced by returning torque that is generated by the angular deviation of the center of gravity from it's lowest position, the magnitude of this returning torque, increasing as the angular deviation increased, until the system reach angular stability; electricity is generating and conducted through tether to an anchoring section for usage.

An airborne system for producing electricity from wind energy includes a shaft, wind turbines rotatably mounted to the shaft and arranged to rotate independently in opposite directions when subjected to the same wind, and generators arranged to convert rotation of the turbines into electricity. A lifting section includes combination of kites and lighter than air balloons, generating a lifting force that caused the system being airborne at desire altitude. The center of gravity of the system is lower than the center of lift of the system; when the turbines of the system exposed to wind and start to rotate, torques are inducing on the shaft of the system these torques are balancing each other and the remaining deferential torque being balanced by returning torque that is generated by the angular deviation of the center of gravity from it's lowest position, the magnitude of this returning torque, increasing as the angular deviation increased, until the system reach angular stability; electricity is generating and conducted through tether to an anchoring section for usage.

The invention discloses a frequency selective surface with high selectivity and angle stability, and aims to solve the technical problem that the existing frequency selective surface cannot realize high selectivity and angle stability concurrently. The frequency selective surface is formed by M*N passive resonant units arranged periodically, wherein M is greater than or equal to 3, and N is greater than or equal to 3; each passive resonant unit adopts an up-down laminated structure consisting of two layers of dielectric substrates; radiation patches of different structures are printed on the surfaces of the two layers of dielectric substrates; each dielectric substrate is provided with a dielectric through hole structure; and the high selectivity and the angle stability of the frequency selective surface are realized due to the mutual coupling between the radiation patches, the mutual coupling between the self structures of the radiation patches, and star-like gaps on the radiation patches. According to the frequency selective surface, the stop band is changed from 0dB to minus 20dB within a frequency range of 23.6-23.9GHz; meanwhile, good passband characteristic is kept within an angle range of 0-45 degrees and within a frequency range of 24-26GHz, so that the frequency selective surface can be used for the fields of reflector antennas, satellite communication and the like.

Airborne system for producing electricity from wind includes at least one shaft, one or more wind turbines rotatably mounted to each shaft, and generators that convert rotation of the turbine(s) into electricity. A lifting section is connected to the shaft(s) and generates a lifting force that causes the system to be airborne. A center of gravity of the system is lower than its center of lift. When the turbines are exposed to wind and rotate (at least one in one direction and another in an opposite direction), torques induced on the shaft(s) of the system balance each other and remaining deferential torque is balanced by returning torque that is generated by the angular deviation of the center of gravity from its lowest position. A magnitude of this returning torque increases as the angular deviation increases until the system reach angular stability. Electricity is generated and conducted for storage or usage.

The invention discloses a multifunctional active frequency selective surface and a control method thereof. The active frequency selective surface comprises a dielectric substrate and two metal periodic arrays arranged orthogonally on the upper side and lower side of the dielectric substrate; each metal periodic array comprises a plurality of metal units in periodic array distribution; and each metal unit is square and includes two metal thin wire structures, two metal thick wire structures and a PIN diode. When the multifunctional active frequency selective surface works, direct-current bias voltage excitation is applied to the upper-layer metal periodic array and the lower-layer metal periodic array so as to carry out encoding; and one of an electromagnetic switch function and a polarization selection function can be realized by changing encoding states, so that the multi-functional active frequency selective surface can be in a double-polarized band-pass state, a double-polarized shielding state, a TE polarized wave selection state or a TM polarized wave selection state. The multifunctional active frequency selective surface of the invention integrates many functions, is simple in manufacture, has good angle stability, can actively control electromagnetic waves and has a bright application prospect.

The invention provides a frequency selective surface structure with improved angle stability, and mainly aims to solve the problem that the existing frequency selective surface is of poor angle stability. The frequency selective surface structure is composed of M*N frequency selective surface units arranged periodically, wherein M>=3, and N>=3. Each frequency selective surface unit consists of a dielectric substrate (1) and a metal patch (2) printed on the surface of the dielectric substrate (1). The frequency selective surface structure is characterized in that each metal patch (2) includes four symmetrically-arranged patterns (21) shaped like a Chinese character 'au'; for each pattern (21) shaped like a Chinese character 'au', the two outer vertical arms are each provided with a hollowed-out gap (23) in the middle and the lower left end is opened in such a way that a continuous winding strip is formed; and the four winding strips are connected end to end through rectangular strips (22) to form a complete square closed-loop strip. The frequency selective surface structure has high angle stability for differently-polarized incident waves, and can be used in satellite communication, reflector antennas and other fields.

The invention discloses an aperture multi-layer structure-based high-out-of-band rejection frequency selective material design method. The method includes the following steps that: (1) a frequency selective material is designed based on an aperture multi-layer structure, wherein the aperture multi-layer structure includes three layers of structures, namely, a top-layer patch, a bottom-layer patch and a middle coupled aperture layer; (2) an out-of-band transmission null characteristic is realized through constructing a design method of patch displacement of the top-layer patch and the bottom-layer patch, and the side band cut-off characteristic of the aperture multi-layer structure-based frequency selective material can be further improved; and (3) a unit interdigital technology is adopted to carry out miniaturization processing on the surface of the frequency selective material, so that the unit size of the surface of the frequency selective material can be decreased. With the method of the invention adopted, a high-order coupling characteristic is realized, and the side band cut-off performance of the frequency selective material can be improved; and the unit interdigital method is adopted, so that the unit size of the surface of the frequency selective material can be decreased, and angle stability under the incoming of electromagnetic waves can be improved; and the out-of-band rejection ability of the frequency selective material is stronger, and the pass-band edge rise performance and sharp drop performance of the frequency selective material are better.

An airborne system for producing electricity from wind energy includes a shaft, wind turbines rotatably mounted to the shaft and arranged to rotate independently in opposite directions when subjected to the same wind, and generators arranged to convert rotation of the turbines into electricity. A lifting section includes combination of kites and lighter than air balloons, generating a lifting force that caused the system being airborne at desire altitude. The center of gravity of the system is lower than the center of lift of the system; when the turbines of the system exposed to wind and start to rotate, torques are inducing on the shaft of the system; these torques are balancing each other and the remaining deferential torque being balanced by returning torque that is generated by the angular deviation of the center of gravity from it's lowest position, the magnitude of this returning torque, increasing as the angular deviation increased, until the system reach angular stability; electricity is generating and conducted through tether to an anchoring section for usage.

Airborne system for producing electricity from wind includes at least one shaft, one or more wind turbines rotatably mounted to each shaft, and generators that convert rotation of the turbine(s) into electricity. A lifting section is connected to the shaft(s) and generates a lifting force that causes the system to be airborne. A center of gravity of the system is lower than its center of lift. When the turbines are exposed to wind and rotate (at least one in one direction and another in an opposite direction), torques induced on the shaft(s) of the system balance each other and remaining deferential torque is balanced by returning torque that is generated by the angular deviation of the center of gravity from its lowest position. A magnitude of this returning torque increases as the angular deviation increases until the system reach angular stability. Electricity is generated and conducted for storage or usage.

The invention discloses an ultra-wide passband frequency selective surface capable of improving angle stability and a design method thereof. The frequency selective surface is formed by five layers: a first metal patch layer, a first intermediate medium layer, a second metal patch layer, a second intermediate medium layer and a third metal patch layer, which are laminated in sequence. The ultra-wide passband frequency selective surface ensures that a frequency selection structure has super-wide passband characteristics, and meanwhile, has stable performance under the condition of large-angle incidence; the frequency selection structure can be combined with the majority of thickness of skins, housings and protective covers and the like freely; and the ultra-wide passband frequency selective surface has a very high practical value.

The invention relates to a concentrated configuration type cross-shaped annulus passband frequency selection surface with high angle stability, which belongs to the technical field of microwave. The frequency selection surface takes a cross-shaped ring as a resonance unit; two equivalent cross-shaped rings exist in one local period unit; a complete cross-shaped ring is arranged at the center point of each local period unit; a quarter of one cross-shaped ring is arranged at each top point of each local period unit; and the distance between every two adjacent centers of the local period units is 0.34-0.36 times the resonant wavelength of an electromagnetic wave. According to the invention, the structural parameters are few; the designed optimization time is short; the frequency selection surface is suitable for big-angle incidence, a central frequency point is hardly drifted when an incidence angle is changed in the range of 0-60 DEG; and with the increase of the incidence angle, the passband transmissivity is reduced slightly, but is still high, and can meet the application requirements on engineering.

The invention provides a frequency selective surface with high angular stability, and is used for solving the problem of relatively low angular stability existing in the prior art. The frequency selective surface comprises M*N frequency selective surface units arranged periodically; each frequency selective surface unit comprises a dielectric plate, and a metal ring pair consisting of two oppositely arranged opening metal rings and a metal patch pair consisting of two oppositely arranged opening metal patches on the upper surface and the lower surface of the dielectric plate; the two metal rings on the same surface are opposite in opening directions; first rectangular grooves in the two metal patches are opposite in directions, and are of 180-degree rotational symmetry about the normal line of the dielectric plate; the position of the metal ring pair corresponds to the position the metal patch pair on the same surface; the projections, on the lower surface of dielectric plate, of the metal ring pair positioned on the lower surface of the dielectric plate and the metal ring pair positioned on the upper surface of the dielectric plate rotate by 90 degrees, metal via holes are used for correspondingly and vertically connecting the opening ends of the two metal ring pairs so as to form the 2.5D frequency selective surface unit structure with high angular stability.

The invention provides a 2.5D braided structure-based high-angular stability frequency selective surface and aims at improving the angular stability of the frequency selective surface. The 2.5D braided structure-based high-angular stability frequency selective surface comprises M*N passive resonance units, wherein each passive resonance unit comprises a dielectric slab, a first metal patch printedon the upper surface of the dielectric slab, a second metal patch printed on the lower surface of the dielectric slab, and metallized through holes; each first metal patch comprises six rotational symmetric first strip groups; each second metal patch comprises six rotational symmetric second strip groups; various strips in the second strip groups are located in gaps, in corresponding positions onthe lower surface, of various corresponding strips in the first strip groups; and the strips in the first metal patches and the second metal patches are connected through the corresponding metallizedthrough holes which penetrate through the dielectric slabs to form a 2.5D braided structure. According to the 2.5D braided structure-based high-angular stability frequency selective surface, good angular stability is achieved on the basis of miniaturization, and the 2.5D braided structure-based high-angular stability frequency selective surface can be applied to the aspects of communications andradars.

The invention provides a robot. An independent and active suspension device cooperated with an undercarriage device is designed in the robot to ensure the stability of a body and obtain the most flexible exercise performance, the robot not only can travel like general vehicles, but also can spin in place and walk all around, and when the robot turns around while walking, the robot also has the smallest turning radius and does not occupy space, the robot has the advantages of excellent abilities to climb slopes, climb stairs and climb obstacles and can cross the 45-degree steep slope. In addition, according to the robot system, the body height can be changed adaptively at any time, by adopting the telescopic neck of the robot, the location of the center of mass can be changed, the view of the neck can also be increased by adjusting, and the angle stability of the neck of the robot in three axial directions is ensured and the vibration of the body caused by the rough of the ground in motion is relieved, and the body of the robot on the move is stable and will not dump.

The invention discloses a double-passband frequency selective surface based on a high-dielectric low-loss all-dielectric metamaterial. The double-passband frequency selective surface comprises two layers of microwave ceramic structures and an air layer clamped between the two layers of microwave ceramic structures. Each microwave ceramic structure is composed of a microwave ceramic substrate of an etched cross-shaped flower-type pore structure and a cylindrical dielectric resonator, wherein the cylindrical dielectric resonator is installed in the center of the cross-shaped flower-type pore structure, and the thickness of the cylindrical dielectric resonator is the same as that of the microwave ceramic substrate. The microwave ceramic substrate is made of high-dielectric low-loss microwave ceramic materials. A pore opening period unit is of a cross-shaped flower-type pore structure, and the band-pass characteristics of the FSS can be expanded and optimized by adjusting the dielectric resonator in the center of the unit structure. By the adoption of the all-dielectric microwave ceramic design, the double-passband frequency selective surface contains no metal materials and has the advantages of being low in loss, high in power capacity, resistant to high temperature and the like; the dual-band gating characteristics within the Ku wave band can be achieved, and the double-passband frequency selective surface has the polarization insensitivity and the good angle stability.

The invention relates to a wide-angle latex-dipped canvas and a production process thereof, belonging to the technical field of textile. The production process comprises the steps of angle adjustment, weaving, latex dipping, drying, shaping and packaging. The weaving included angle between the warp thread and the fill thread of cloth weaved by the process is 1-179 degrees, and the outer surface of weaved wide-angle canvas is soaked with a layer of latex. The invention has the advantages that a warp and fill thread has high angle stability, and the product has strong adhesivity; when in use, the product can be processed by mechanical latex spreading, latex pasting, dipping and latex scraping, and the angles of the warp and fill threads of canvas are not changed. With high finished productrate, simple production process and low cost, the wide-angle latex-dipped canvas can be used as the framework of rubber, plastic and such products or used as wrapping material.

The invention relates to the application field of a metamaterial frequency selection technology and discloses a three-dimensional band-pass frequency selection structure and a manufacturing method thereof. The three-dimensional band-pass frequency selection structure includes: a plurality of band-pass frequency selection units distributed periodically, each band-pass frequency selection unit comprises a surface plasmon panel unit and a metal square-hole honeycomb having a length by width by height of a by b by h, A surface plasmon panel unit is connected with a metal square hole honeycomb along a height direction, The surface plasmon panel element passes through the center point of the metal honeycomb and is parallel to the panel of length a in the metal honeycomb. This three-dimensional band-pass frequency selection structure not only realizes the wideband filtering, but also improves the frequency cutoff effect and has good angular stability. The mechanical properties of frequency selective structure areenhanced by introducing metal honeycomb.

A downhole apparatus for cutting casing and rock when radial drilling defined by a cutting head that includes three or more cutting edges positioned around the cutting head's axis of rotation, at least three of the cutting edges in continuous contact with the face of the material being cut, thereby providing lateral and angular stability to the cutting head, one or more internal fluid passageway within the cutting head and one or more orifices for ejecting drilling-fluid out of the cutting head.

The invention discloses an active frequency selection surface with broadband and angle stability, and mainly aims to solve the problem that the existing frequency selection surface cannot take both of broadband and angle into consideration at the same time. The active frequency selection surface with broadband and angle stability comprises a periodical surface (1) and a dielectric substrate (2); the periodical surface is printed on the upper surface of the dielectric substrate, and is formed by M*N active resonant units (11) in periodical arrangement; each active resonant unit consists of a circular patch (111), a deformation X-shaped patch (112) and a variode (113); the circular patch and the deformation X-shaped patch are crossed in a central position and the geometrical central points of the two patches coincide; each deformation X-shaped patch consists of four branches; each branch consists of a first linear section, a fan-shaped clamping line and a second linear section connected in sequence; one ends of the four branches coincide in one point and in X-shaped distribution; and one end of each second linear section C is connected with the corresponding variode. The active frequency selection surface has high broadband and angle stability, and can be used for a reflector antenna and satellite communication.

The invention discloses a branch-loaded three-band composite microwave absorbing structure based on a frequency selective surface, belonging to the field of electromagnetic field and microwave communication. An upper dielectric layer, a frequency selection surface and a lower dielectric layer sequentially are arranged from top to bottom; a passive resonance unit of the frequency selective surfacecomprises a three-band absorbing structure and a square ring patch for absorbing a specific wave, the square ring patch being arranged on the three-band absorbing structure, the three-band absorbing structure comprises an arm-removed rectangular Jerusalem cross-shaped patch and a branch perpendicular to each other, the square ring patch and the Jerusalem cross-shaped patch are arranged in a centercoinciding manner, and the arm-removed rectangular portion of the Jerusalem cross-shaped patch is connected with four end points of the branch. The invention solves the problems that the angular stability and the microwave absorption performance of the cross-shaped structure in the existing frequency selective surface are poor, and the square ring structure can only absorb single frequency bands,and achieves the effects of improving the angular stability and absorbing waves in three frequency bands.

The invention discloses a top emitting white light organic electroluminescent device and its preparation method, and belongs to the technical field of organic electroluminescence. The appliance comprises a top emitting blue light organic electroluminescent device and a micro-structure quantum dot lower converting film; the quantum dot material is used for absorbing a part of energy of the top emitting blue light appliance to generate photoluminescence; finally, two colors of lights are mixed to generate white light. By using the lower converting structure, the stability of spectrum along voltage and time is improved. By using the quantum dot as the lower converting material, the converting efficiency of the blue light pumping in the conversion process is improved, the lighting efficiency of the top emitting white light appliance is promoted. Through the embossing method, the microstructure array is introduced to the surface of the lower converting film of the quantum dot, the microstructure array can improve the light intake, scatter the light beam, and improve the angle stability of the spectrum.

A one-piece piston having an investment or other permanent or non-permanent mold / die precision cast piston crown, rod flange and piston skirt. The piston crown has a relative constant thickness, a flange requiring minimal machining and a skirt providing for a wall with a support against the angular shifting of the piston. This improves the distribution of heat within such crown and the angular stability of the piston wall at the piston rod connection.

The invention relates to a frequency selection surface structure applied to 5G communication and a unit structure thereof. The unit structure comprises a first dielectric substrate, a metal layer anda second dielectric substrate which are arranged in order from top to bottom, wherein the metal layer is provided with an improved Jerusalem gap and an improved square-ring gap; the improved square-ring gap surrounds the periphery of the improved Jerusalem gap, and the center of the improved Jerusalem gap and the center of the improved square-ring gap coincide with the center of the metal layer. The frequency selection surface structure comprises M*N periodically arranged unit structures. The frequency selection surface structure comprises dual-band band-pass features of 28GHz and 39GHz, and agood filtering effect; and moreover, the frequency selection surface structure has excellent polarization stability and angle stability, and when incident waves are incident at different angles in different polarization modes, the resonance frequency is always within a 5G frequency band.

An insulating glass (IG) window unit including first and second glass substrates that are spaced apart from each other. At least one of the glass substrate has a triple silver low-emissivity (low-E) coating on one major side thereof, and a dielectric coating for improving angular stability on the other major side thereof.

The invention discloses a frequency selective surface structure, which comprises an upper dielectric layer, a frequency selective surface and a lower dielectric layer. The frequency selective surfaceprovided by the invention is a composite structure of Jerusalem cross-shaped structures loaded with branches, a passive resonant unit of the frequency selective surface is composed of four Jerusalem cross-shaped structures and two mutually perpendicular branches, the Jerusalem cross-shaped structures are connected at four endpoints of the two mutually perpendicular branches, and the connection point is the endpoint of the cross-shaped frame with one arm rectangle being removed of the Jerusalem cross-shaped structure. The S11 parameter of structure reaches -15db within the wave absorbing rangeof 6-8GHZ, the structure has a great wave absorbing peak between 2.2-2.8GHZ and 11-12GHZ, has an excellent wave absorbing effect within three absorption bands of an incident wave angle below 45 degrees and possesses very good angle stability. The structure can be applied to various fields such as communication, environmental protection and human body protection.

The invention discloses a frequency selective surface with high selectivity and angle stability, and aims to solve the technical problem that the existing frequency selective surface cannot realize high selectivity and angle stability concurrently. The frequency selective surface is formed by M*N passive resonant units arranged periodically, wherein M is greater than or equal to 3, and N is greater than or equal to 3; each passive resonant unit adopts an up-down laminated structure consisting of two layers of dielectric substrates; radiation patches of different structures are printed on the surfaces of the two layers of dielectric substrates; each dielectric substrate is provided with a dielectric through hole structure; and the high selectivity and the angle stability of the frequency selective surface are realized due to the mutual coupling between the radiation patches, the mutual coupling between the self structures of the radiation patches, and star-like gaps on the radiation patches. According to the frequency selective surface, the stop band is changed from 0dB to minus 20dB within a frequency range of 23.6-23.9GHz; meanwhile, good passband characteristic is kept within an angle range of 0-45 degrees and within a frequency range of 24-26GHz, so that the frequency selective surface can be used for the fields of reflector antennas, satellite communication and the like.