63results about How to "Increase electrostatic force" patented technology

A method for manufacturing a micromechanical device, in particular a micromechanical vibrating-mirror device, having the following steps: making available a three-layer structure having a first layer, a second layer and a third layer, the second layer lying between the first and the third layers; etching through the first layer up to the second layer to produce an island region, lying on the second layer, which is joined to region of the first layer surrounding the island region by way of one or more connecting webs, and etching through a region of the third layer up to the second layer and removing a region of the second layer below the island region in such a way that the island region can perform movements, preferably torsional vibrations, about the one or more connecting webs, the torsional vibrations having such an amplitude that a part of the island region extends into the etched-through region of the third layer.

A capacitive device comprising at least one first and one second comb, respectively provided with interdigital fingers, adapted to be mobile relative to each other depending on the closing-spacing apart of the axes of the fingers, at least one finger of the first comb including a face opposite a face of a finger of the second comb wherein the axis of the finger of the first comb and the axis of the finger of the second comb are inclined relative to a plane orthogonal to the first direction of displacement of the combs, the plane being defined by the second and third directions perpendicular to the direction, and perpendicular to each other.

The invention relates to the technical field of concrete additives, and more specifically relates to application of a hydroxyl terminated hyperbranched polyester hyperbranched retarder in adjustment of retardation time of concrete. A new hyperbranched retarder is synthesized by synthesizing a carboxyl terminated hyperbranched polymer first, then performing end capping on the carboxyl terminated hyperbranched polymer, and synthesizing the hydroxyl terminated polymer into a main chain. When used in the field of concrete additives, the hyperbranched retarder can well improve the mobility of concrete and prolong the retardation time, and the hyperbranched retarder has a simple and convenient synthesis process, is easy to industrialize and has superior performance.

The invention discloses an oscillation control method for a micromechanical resonator and the micromechanical resonator. The micromechanical resonator comprises a substrate, and an oscillation structure and a driving structure which are arranged on the substrate. The driving structure is used for driving the oscillation structure of the micromechanical resonator to move in a reciprocating way, generating facilitating electrostatic force which is applied to the oscillation structure and facilitates reciprocating movement of the oscillation structure when the oscillation structure moves in the reciprocating way, and generating restricting electrostatic force which is applied to the oscillation structure and restricts reciprocating movement of the oscillation structure so that frequency deviation generated by the softening effect of an electrostatic spring and frequency deviation generated by the hardening effect of the electrostatic spring in reciprocating movement of the oscillation structure can be mutually cancelled, and thus the micromechanical resonator is controlled to work at the inherent frequency and work stability of the micromechanical resonator is enhanced.

A Capacitive Micromachined Ultrasonic Transducer (CMUT) (200) comprises a membrane (220) operatively connected to a top electrode (210) and a bottom electrode having a concave void (230). When a Direct Current (DC) bias voltage is applied, the membrane (220) is deflected towards the bottom electrode so that a peripheral edge region of the membrane (220) is closer to the bottom electrode and an electrostatic force proximal to the peripheral edge region of the membrane (220) is increased.

The invention provides a high-voltage static suspension circuit suitable for ground testing of a static suspension acceleration meter. The circuit comprises a reversal phase circuit, an upper electrode plate high-voltage drive circuit, a lower electrode plate high-voltage drive circuit and a high-voltage power source. Voltage control signals output by a PID controller are used as input of the reversal phase circuit. Output of the reversal phase circuit and offset control signals are used as input signals of the lower electrode plate high-voltage drive circuit. The voltage control signals and the offset control signals are used as input signals of the upper electrode plate high-voltage drive circuit. Offsetting is carried out on the voltage control signals to obtain high-voltage control signals of an upper electrode and a lower electrode respectively. The high-voltage control signals are used for controlling base currents of a high-voltage drive audion, so that currents flowing through a collector of the audion are controlled; voltage dividing is carried out on the high-voltage power source through a voltage dividing resistor, proper voltage is exerted on the upper electrode and the lower electrode corresponding to high-precision static suspension acceleration meter sensors, and electricity large enough is provided for realizing suspension testing of testing masses of the acceleration meter.

The invention belongs to the field of application of graphene materials to electrostatic loudspeakers, and relates to a novel graphene composite type electrostatic loudspeaker diaphragm which comprises a loudspeaker diaphragm body and graphene coatings coating the two sides of the loudspeaker diaphragm body, the loudspeaker diaphragm body is a polymer film, and the thickness ranges from 2 micrometers to 7 micrometers. the graphene coating is prepared from the following components in parts by weight: 5-50 parts of a water-based film forming base material; 1-20 parts of a graphene slurry; 5-50 parts of deionized water; 5-50 parts of a cosolvent; And 1-10 parts of an auxiliary agent. The vibrating diaphragm is compounded with the graphene material, so that the structural strength of the vibrating diaphragm is enhanced under the condition that the thickness and the mass of the vibrating diaphragm are not changed basically, and the flexibility of the vibrating diaphragm is better; Meanwhile, the graphene has excellent superconducting performance; Uniform island type polarization charge points are formed on the surface of the vibrating diaphragm, the analyzing capacity of the vibrating diaphragm on a sound source is improved, the distortion rate of sound is reduced, and due to the fact that the graphene is high in heat conductivity coefficient, resistant to acid, alkali and salt andother chemicals and high in adhesive force with the PEI diaphragm, the graphene composite vibrating diaphragm is good in heat dissipation, good in abrasion resistance and improved in aging resistance.

A fixed aperture includes a first fixed slit and a second fixed slit which are arranged respectively in regions positioned on both sides with a moving line sandwiched therebetween. A drive aperture includes a first drive slit and a second drive slit which are arranged on both sides with the moving line sandwiched therebetween. The first fixed slit and the first drive slit are formed in an extending manner along a first line, and are arranged such that these slits communicate with each other when a shutter is at a position where the transmission of light is allowed. The second fixed slit and the second drive slit are formed in an extending manner along a second line which intersects with the first line, and are arranged such that these slits communicate with each other when the shutter is at a position where the transmission of light is allowed.

When a high power signal is input to an electromechanical device, electrostatic force can automatically and unintentionally drive the movable electrode. A high reliability electromechanical device that prevents this is achieved. The electromechanical device of the invention is an electromechanical device formed on a substrate, and having a signal electrode and a drive electrode formed across a gap from a movable electrode. Applying an attraction force between the movable electrode and the drive electrode enables the movable electrode to contact the signal electrode. A high electrostatic capacitance is formed by disposing the movable electrode and drive electrode in opposition with a dielectric layer therebetween on the RF signal input port side. As a result, the potential difference between the movable electrode and drive electrode is reduced even when a high power signal is input, and a high reliability electromechanical device can be achieved.

The invention belongs to the field of polymer materials, and concretely relates to an easily-stripped environmentally-friendly film, and a production method and a bamboo chopstick adsorbing technologythereof. The easily-stripped environmentally-friendly film comprises, by weight, 50-65 parts of PLA, 30-45 parts of PBAT, 2-10 parts of chitosan, 0.1-1 part of nanometer titanium dioxide, 3-8 parts of poly(3-hydroxybutyrate-co-3-hydroxhexanoate), 0.2-0.8 part of a chain extender and 0.1-1 part of a lubricant. The film has a good biocompatibility, can be composted and decomposed under natural conditions, and ensures that the film has no pollution to the environment after being discarded; the environmentally-friendly film can be completely adsorbed to bamboo chopsticks through electrostatic adsorption, so the problem of pollution of bacteria existing in the use process of the bamboo chopsticks to foods is avoided, and the cleaning problem of the used bamboo chopsticks is solved; and the easily-stripped environmentally-friendly film has the advantages of using of a routine device, simple technology, easiness in operation, and convenience in industrial promotion and application.

Polymer nonwoven nanoweb containing ionic functional group and respiratory mask including the same are provided. The polymeric nonwoven web comprises polymer fibers having a diameter in the nanometer range and having a polymer with an ionic functional group in its main chain or side chain. The ionic functional group may be a sulfonate group, an ammonium group, an azanide group, a phosphonate group, a phosphate group, or a zwitterion group having two of these ionic functional groups linked. The polymeric nonwoven web may further comprise a counter ion having a charge of opposite sign to the charge of the ionic functional group, such as Ag⁺ or I⁻.

A multi-step microactuator is provided with the multiple supports in a stepper plate to give multi-step displacement to a controlled object. The microactuator has advantages such that multiple motion can be applied to the controlled object and that the object can be controlled in a low driving voltage and that simple motion control is applied by digital controlling and that the degrees of freedom in motion of the object can be chosen by the number of the stepper plate and that only single voltage is needed for driving the micromirror motion. With many advantages, the multi-step microactuator provides a solution to overcome the difficulties in controlling multi-step motion.

The invention discloses a preparation method of an organic-inorganic ferroelectric polymer composite film. The method comprises the following steps: by taking a graphene/copper high-index surface with one-dimensional periodic potential on the surface as a substrate, uniformly dissolving vinylidene fluoride-trifluoroethylene copolymer (P (VDF-TrFE)) powder in a tetrahydrofuran organic solvent, then adding a ground single crystal lead titanate (PbTiO3) mesoporous material, fully stirring, spin-coating a proper amount of solution on the substrate, and drying to obtain the graphene/copper composite mesoporous material. And carrying out vacuum drying and annealing treatment to obtain the organic-inorganic ferroelectric polymer composite film. The composite film prepared by the method is good in orientation, shows excellent ferroelectric properties, and has wide application prospects in flexible energy transducers, sensing devices and ferroelectric storage devices.

The invention discloses a using method of an electrostatic dust collection device for a construction site. The method comprises the following steps of: S1, injecting cleaning water, i.e. injecting a certain volume of clear water into a water storage position of the dust collection device; S2, mounting the dust collection device, i.e. fixedly hanging the dust collection device at a high position ofa construction site; S3, removing dust, i.e. taking down the dust collection device hung for a period of time from the high position, and pouring out the dust in the air filtered and collected in thedust collection device; and S4, cleaning the dust collection device, i.e. cleaning a dust collection part of the dust collection device. By arranging dust removal pipes, springs and a driving mechanism, wind power can be used as a driving force to enable the dust removal pipes to generate static electricity to adsorb dust in the air, meanwhile, water can be pumped to clean the surface of the dustremoval pipes, and good dust suction capacity can be guaranteed to the dust removal pipes all the time, therefore the automatic dust removal function of a construction site is achieved.

The invention discloses a V-type electric coalescence dehydration dynamic experimental device. The device comprises an oil-water emulsion preparation device, a V-type dynamic electric coalescence device, an image acquisition and treatment device and a circulation recovery device; the oil-water emulsion preparation device comprises a sedimentation tank, a water storage tank and a stirring reactor,wherein the sedimentation tank and the water storage tank are connected with an inlet of the stirring reactor separately, an oil-well pump is arranged between the sedimentation tank and the stirring reactor, and the bottom of the sedimentation tank is provided with a water outlet; an outlet of the stirring reactor is connected with an inlet of the top of the V-type dynamic electric coalescence device through a diaphragm pump; the inner portion of the V-type dynamic electric coalescence device is provided with one or more groups of V-shaped electrode plate sets, each V-shaped electrode plate set comprises an upper layer electrode plate and a lower layer electrode plate, the upper layer electrode plates and the lower layer electrode plates are arranged in parallel in a V shape, the upper layer electrode plates are connected with the positive electrode of a high-voltage electrostatic generator, the lower layer electrode plates are connected with the negative electrode of the high-voltageelectrostatic generator; the bottom of the V-type dynamic electric coalescence device is connected with a recycling device, and the design is more compact in structure and higher in efficiency than existing design.

The invention belongs to the technical field of ceramic teeth, and relates to a high-strength and high-hardness ceramic gum abutment. The ceramic gum abutment is prepared from, by weight, 90 to 110 parts of zirconium oxide powder, 60-90 parts of titanium dioxide, 20 to 50 parts of aluminum oxide fibers, 0.2 to 1.0 part of ferric oxide, 0.1 to 2.0 parts of a dispersant, 20 to 50 parts of light-cured resin, 0.1 to 0.5 part of a photoinitiator, 0.1 to 3.0 parts of an adhesive, 0.5 to 5.0 parts of a coloring agent, 0.5 to 1.0 part of a pore-forming agent and 500 parts of a solvent; and the particle size of the zirconium oxide powder ranges from 100 nm to 500 nm, the particle size of the titanium dioxide ranges from 400 nm to 1000 nm, the diameter of the aluminum oxide fibers ranges from 50 nmto 200 nm, and the length of the aluminum oxide fibers ranges from 10 [mu]m to 200 [mu]m. According to the high-strength and high-hardness ceramic gum abutment, the surface of the ceramic gum abutmentis pure white and free of metallic luster, the surface is free of cracks in the machining process, the service life of the gum abutment is long, and safety is good.