135results about How to "Increase asymmetry" patented technology

The invention relates to a closed loop control circuit for ultrasonic motor. A positive inversion unbalanced compensation circuit for ultrasonic motor is equipped between the output terminal of the isolated electrode voltage and the frequency controller. According to that the control error of the frequency controller is equal to the given value minus isolated electrode voltage feedback value, adjusting the feedback value or the given signal value to make the control error of the frequency controller close when the motor is in positive inversion can change output frequency of the frequency controller, making the ultrasonic motor have close rotational speed in positive inversion under control of subsequent circuit. The compensation circuit comprises a rheostat with the two ends respectively connected with a gating branch. The adjustable terminal of the rheostat is connected with the output terminal of the rectifier filter processing circuit. A power supply is series-connected with the adjustable terminal of the rheostat via a DC bias resistor, and then connected with the positive input terminal of the operational amplifier, controlling the corresponding gating branch and conducting voltage dividing by positive inversion control signal. The operational amplifier in frequency controller can figure out different signal value, making frequency controller output close control signal.

There is provided an illumination device (100) comprising: a substrate (104); an optically transmissive first layer (106) arranged on the substrate; a photon emitting layer (108), arranged on the optically transmissive first layer and comprising a photon emitting material configured to receive energy from an energy source and to emit light having a predetermined wavelength; a periodic plasmonic antenna array, arranged on the substrate and embedded within the first layer, and comprising a plurality of individual antenna elements (114) arranged in an antenna array plane, the plasmonic antenna array being configured to support a first lattice resonance at the predetermined wavelength, arising from coupling of localized surface plasmon resonances in the individual antenna elements to photonic modes supported by the system comprising the plasmonic antenna array and the photon emitting layer, wherein the plasmonic antenna array is configured to comprise plasmon resonance modes such that light emitted from the plasmonic antenna array has an anisotropic angle distribution; and wherein the photon emitting layer is arranged at a distance from the antenna array plane corresponding to a location of maximum field enhancement for light out-coupling resulting from the plasmonic-photonic lattice resonances.

The invention relates to asymmetric-structure modified epoxy acrylic resin and a continuous method synthetic method. The continuous method synthetic method comprises the following steps: causing an acrylic acid monomer and epoxy resin to react to prepare epoxy acrylic resin; adding a modified monomer and anhydride into a reaction system at one time, controlling temperature and reaction time, and preparing the asymmetric-structure modified epoxy acrylic resin; adding active diluting monomer to regulate viscosity, and discharging. The epoxy acrylic resin module prepared with the continuous method synthetic method has an asymmetric structure, can be applied to various photocuring coatings and ink products, especially photocuring optical fiber coatings and has the advantages of low finished product viscosity, high curing speed and good surface drying performance. A solidification membrane simultaneously has high modulus and toughness. The preparation method is simple in technology and can be used for continuous production, production efficiency is improved, and production cost is saved.

The invention discloses a dual-polarization broadband weak coupling feed source array and relates to a phase array feed source receiver in the radio astronomy field. The dual-polarization broadband weak coupling feed source array can be used in feed sources of reflector antennasin the field of communication, observing and control and monitoring. According to the distribution rules of a reflector antenna focal plane field, a hexagonal reflection back cavity vibrator is distributed in a hexagonal small-space distribution mode to form a feed source array, so that energy receiving is facilitated, sampling of a focal plane field distribution is met, and good broadband characteristics and weak array coupling can be achieved. The hexagonal reflection back cavity vibrator comprises a radiator, a coaxial feeder, a hexagonal reflection back cavity and a matching disc, wherein the reflection back cavity adopts a small hexagonal structure, and array forming is facilitated.

The invention discloses a magnetorheological damper with a multi-piece piston and a single rod. The magnetorheological damper consists of a working cylinder, an external electromagnet, a compensating air bag, the multi-piece piston and a piston rod, wherein the multi-piece piston consists of three or more groups of dynamic pieces; each group of dynamic piece has a circular ring form, and consistsof a strip flat plate which has a round hole in the center and two semicircular arc flat plates; the circular ring form is formed by respectively connecting one semicircular arc flat plate to one of two parallel straight edges of the strip flat plate which has the round hole in the center by a hinge; the outer diameters of the dynamic pieces are smaller than the inner diameter of the working cylinder; the flowing gaps of magnetorheological liquid are left; the groups of dynamic pieces of the multi-piece piston are fixed at one end of the piston rod at certain intervals through the round holeson the dynamic pieces; the other end of the piston rod is stretched out of the working cylinder through a sealing device and a bearing on the end face of the working cylinder; the compensating air bag is arranged at the bottom in the working cylinder; the external electromagnet is fixed on the external circumference of the working cylinder; the working cylinder is made of a magnetically-nonconductive material; and the magnetorheological liquid is fully filled in the working cylinder.

The invention provides an adjustable limiting ring used for a plasma processing device. The limiting ring is used for controlling discharge of redundant gas in a manufacturing process and neutralizing redundant charged particles; at least a baffle is arranged below the limiting ring; the baffle is parallel with the limiting ring and is at least partially overlapped with the limiting ring in the vertical direction; and the baffle is provided with a plurality of discharge channels. The adjustable limiting ring used for the plasma processing device can improve regional asymmetry in the plasma manufacturing process, and further improve non-uniformity of the manufacturing process of substrates.

A pneumatic radial tire has a carcass and a tread. The carcass has at least one carcass reinforcing ply and opposing bead portions. Each bead portion has a bead core and a bead apex radially. The apexes in each bead portion having the same radial height (HA), as measured from a bead base line (B). The tire has a bead reinforcing ply comprising chopped carbon fiber in the amount of 0.5 to 30 parts per hundred rubber located in only one bead portion of the tire, with the bead reinforcing ply being adjacent to the carcass reinforcing ply.

In a DRAM memory circuit, the sense amplifiers, for amplifying the differential voltage sensed between the cores of a bit line, in each case contain two transistor circuits, each of which has two switching transistors. The first transistor circuit pulls the lower potential of the sensed differential voltage down to a defined low logic potential. The second transistor circuit pulls the higher potential up to a defined high logic potential. According to the invention, all the transistors in the sense amplifier are field-effect transistors of the same conduction type, in the case of which the channel is at low impedance if the gate potential is higher than the source potential at least by the amount of the threshold voltage Vth. The second transistor circuit may contain, for each of its two switching transistors, in each case a pump circuit in order to boost the gate of that switching transistor which is intended to pull up the higher logic potential to a potential which is higher than the high logic potential by at least the amount of the threshold voltage Vth.

The invention relates to the technical field of organic materials, and provides an organic compound as well as an electronic element and an electronic device using the same. The structure of the organic compound is composed of a chemical formula I and a chemical formula II. When the organic compound is used for a light-emitting layer of an organic electroluminescencedevice, the efficiency of the device can be effectively improved, and the service life of the organic electroluminescence device is prolonged.

A tuning fork-type crystal vibrator is provided that has improved CI and shock resistance. The tuning fork-type crystal vibrator includes a tuning fork-shaped crystal element made of a pair of tuning fork arms having grooves in their principal surfaces, and a tuning fork base portion from which the pair of tuning fork arms extends, an outer shape of the tuning fork-shaped crystal element being processed by etching. The tuning fork-type crystal vibrator has a protrusion, formed due to anisotropy of said etching, on a +X surface of the lateral faces of the tuning fork-shaped crystal element, and a first slanted portion rising from a −X direction in a +X direction formed in a tuning fork slit. A tip of the tuning fork slit on a principal surface side is shifted in +X direction from a center line bisecting the tuning fork-shaped crystal element in a width direction to a position at which tuning fork vibrations of the pair of tuning fork arms are balanced.

A sine-wave current line-start three-phase rare-earth permanent magnet synchronous motor includes a motor shaft, a rotor and a stator. The rotor is disposed inside the stator and rotates around the motor shaft. The rotor includes P pairs of poles. Each pole includes a polar arched surface. A planar surface is formed between adjacent polar arched surfaces. Thus, a non-uniform air gap is formed between the pole face of the rotor and the inner circumferential surface of the stator. By the use of a salient-pole structure with the non-uniform air gap, the asymmetry of the magnetic circuit caused by permanent magnets can be offset, thereby making the manufacturing process of the rotor simplified, the negative sequence components of the rotor current during the line starting process reduced significantly, the starting performance improved, the sine-wave current provided during the operating process, the harmonic loss reduced, and the motor efficiency enhanced.

A pneumatic radial tire has a carcass and a tread. The carcass has at least one carcass reinforcing ply and opposing bead portions. Each bead portion has a bead core and a bead apex radially. The apexes in each bead portion having the same radial height (HA), as measured from a bead base line (B). The tire has a bead reinforcing ply comprising carbon fiber reinforcing cords located in only one bead portion of the tire, with the bead reinforcing ply being adjacent to the carcass reinforcing ply.

The invention discloses a compound taking a dibenzo five-membered heterocyclic ring as a core and an application thereof, and belongs to the technical field of semiconductors. The structure of the compound provided by the invention is shown as a general formula (1) or a general formula (2), the compound provided by the invention contains a dibenzo five-membered heterocyclic parent nucleus structure, and has appropriate HOMO and LUMO energy levels, a relatively high triplet state energy level (T1) and a relatively low dipole moment. After the compound is applied to an OLED device, the luminousefficiency of the device can be effectively improved, and the service life of the device can be effectively prolonged.