58results about How to "Control resistance" patented technology

A converter circuit and methods for operating the same. The converter circuit includes a supply voltage, a capacitor, an inductor, and four stacked switching elements. Each switching element is adjustable from a low resistance state to a high resistance state by a control signal. The inductor outputs current to a circuit load. The circuit may be operated in a first mode such that the output is adjustable between the supply voltage and half the supply voltage. Alternatively, in a second mode of operation, the output is adjustable from half the supply voltage to a ground voltage.

A welding wire for use in electric arc welding and method of making same, wherein the wire has an effective outer diameter and comprises a length of solid metal formed into a series of distinct segments each having a selected volume and having an indented and non-indented region with the cross sectional area of the solid metal at said non-indented region being greater than the cross sectional area of the solid metal at the indented region.

The invention belongs to the technical field of pesticide synergism, and in particular relates to a synergistic weeding composition containing 1-(2-chloro-3-(3-cyclopropyl-5-hydroxyl-1-methyl-1H-pyrazole-4-carbonyl)-6-trifluoromethylphenyl) piperidine-2-ketone or a salt and ester thereof. The synergistic weeding composition contains a weeding effective quantity of active ingredients A and B, wherein A is a compound shown in the specification or a salt thereof, C1-C4 carboxylic ether, and benzoate; and B is selected from 1) phenoxy carboxylic acids, 2) pyridine carboxylic acids, 3) benzoic acids, 4) nitriles, 5) triazolinones, 6) diphenyl ethers, 7) thiadiazoles, 8) pyrimidine diones, 9) amides, 10) sulfonylureas, 11) slalfamides, 12) pyrazoles, 13) thiocarbamates, 14) bentazone and the like. The composition can effectively prevent and remove grassy weeds and broadleaf weeds in a wheat paddock, and has the characteristics of expanding a weeding spectrum, being obvious in synergistic effect, reducing the application amount, being safe to crops, and the like.

The invention provides a self-adjusting type intelligent atomizing core which comprises a body and a printing resistor arranged on the upper surface of the body. The aperture of crystalline grains inthe body is increased from top to bottom. Due to the big-end-down aperture of the crystalline grains, cigarette liquid can conveniently permeate through the crystalline grains from bottom to top and can be prevented from flowing downward, the upward moving cigarette liquid in a liquid inlet groove can press against the downward movement of the atomized cigarette liquid and the cigarette liquid pressed by the atomized cigarette liquid to move downward, the volatilizing efficiency of the atomized cigarette liquid is improved, and the atomizing efficiency of the cigarette liquid is improved. Dueto the design, the invention further provides a manufacturing method of the self-adjusting type intelligent atomizing core. The manufacturing method includes the steps of sequential overlapping of a plurality of ceramic layers, calcinating, silk-screening and sintering. The method is simple in process and reliable.

The invention provides a variable lateral force cavitator, which comprises a front-end tapered cavitator and a circular controlling element arranged behind the front-end tapered cavitator, wherein the circular controlling element is divided into two to four lamellas; the joint of each lamella of the circular controlling element is provided with circular arc steel sheets mutually connected; the front-end tapered cavitator is internally provided with a movable element; the movable element consists of a tapered moving part and a cylindrical control stick; the tapered moving part and the cylindrical control lever are divided into lamellas of which the portion quantity is equal to that of the circular controlling element; and the cylindrical control lever controls the tapered part to transversely displace. The cavitator can control resistance coefficients and lift coefficients of the cavitator, can change the pitching force and the yawing force of navigating bodies, and has the advantages of strong maneuverability and simple structure.

A method for forming a semiconductor integrated device, comprising: providing a semiconductor substrate, the semiconductor substrate has a first region and a second region opposite to the first region, the surface of the semiconductor substrate in the first region is sequentially formed with first A silicon oxide layer, a first polysilicon layer, and a second silicon oxide layer, and an isolation layer is formed on the surface of the semiconductor substrate in the second region; using the same formation process, the second silicon oxide layer and the isolation layer Form the second polysilicon layer on the surface of the layer; remove the second polysilicon layer, the second layer of silicon oxide layer, the first polysilicon layer, and the first layer of silicon oxide layer in the first region to form a sub-gate flash memory; removing part of the second polysilicon layer in the second region to form a polysilicon resistor. The polysilicon layer in the polysilicon resistor is formed in the same formation process as the control gate of the split-gate flash memory, which saves etching and deposition steps and improves process integration.

A photoconductive device includes: a photoconductive layer configured to generate carriers upon irradiation with excitation light, a first electrode arranged on the photoconductive layer, a second electrode arranged on the photoconductive layer with a gap between the first and second electrodes, and a third electrode arranged in a region over which an electric field caused by voltages applied to the first and second electrodes or an electric field caused by irradiation with a terahertz wave extends. A depletion layer of the photoconductive layer is controllable by a voltage applied to the third electrode.

The invention provides a tension damper. A balance bar is rotatably mounted on a balance base. An angle sensor used for detecting the rotation angle of the balance bar is arranged on the balance base.With the rotation axis of the balance base as a boundary, a damper body is arranged at one end of the balance bar and is used for providing advancing resistance for a wire or strip; and a sliding block device is arranged at the other end of the balance bar, and the position of the sliding block device can be adjusted along the balance bar. According to the tension damper, the tension applied to the wire or strip can be accurately adjusted through the structure of the balance bar, and thus, the tension damper can be applied to a wire or strip production line with a high precision requirement;and the resistance of the wire or strip can be controlled to keep the advancing speed of the wire or strip constant while the tension is controlled, the tension borne by the wire or strip is kept constant, and thus, the production quality of high-precision wires or strips is improved.

The invention discloses a method for preparing a tungsten-doped vanadium oxide film, comprising the following steps of: firstly, placing the cleaned substrate into a high vacuum chamber; secondly, introducing high-purity argon gas into a vacuum chamber; respectively carrying out sputter cleaning on the surfaces of a metal vanadium target and a metal tungsten target by turning on a vanadium target sputter power supply and a tungsten target sputter power supply under the condition that the substrate is shielded by using a substrate baffle; introducing high-purity oxygen gas into the vacuum chamber; opening the substrate baffle, closing a tungsten target baffle, turning on the vanadium target sputter power supply and depositing a bottom layer vanadium oxide film; after the depositing the bottom layer vanadium oxide film, closing oxygen gas and the vanadium target baffle and turning off the vanadium target sputter power supply, turning on the tungsten target sputter power supply and opening the tungsten target baffle and depositing an intermediate layer of tungsten film; after depositing the metal tungsten film, turning off the tungsten target sputter power supply and closing the tungsten target baffle, introducing oxygen gas again, turning on the vanadium target sputter power supply and opening the vanadium target baffle and depositing the vanadium oxide film; and finally, carrying out in-situ annealing treatment on a composite film obtained through deposition.

The invention discloses a voltage/current double-loop control device and a chip, relating to the field of integrated circuits. In the voltage/current double-loop control device provided by the embodiment of the invention, a selection unit comprises a selection amplifying subunit and a common mode subunit, wherein the selection amplifying subunit is used for amplifying a signal with a large voltage value in output signals of a comparison amplifying unit and outputting the signal to a voltage controlled resistor as a control signal. Since the signal with a large voltage value in the output signals of the comparison amplifying unit is amplified, the resistance value of the voltage controlled resistor can be controlled more accurately, and the control accuracy of the voltage/current double-loop control device can be improved further.

An integrated circuit programmable resistor or programmable capacitor has a floating gate memory cell connected either in series or in parallel to a fixed resistor or a fixed capacitor. The resistance or the capacitance of the floating gate memory cell can be changed by the amount of charge stored on the floating gate which affects the resistance or the capacitance of the channel from which the floating gate is spaced apart. A particular application of the programmable resistor/capacitor is used in a system whereby the resistance or the capacitance can be change or fine tuned as a result of either drift caused by time or by operating conditions such as temperature. Thus, the temperature of the substrate in which the floating gate memory cell is fabricated can be monitored and the resistance or the capacitance of the floating gate memory cell changed dynamically.

A method of manufacturing a belt having a region comprising a non-woven material on a pulley engaging surface. The non-woven region has a random coverage of the non-woven material to reduce natural frequency harmonics, control frictional characteristics, permeation and thermal resistance. The non-woven may comprise a combination of softwood and hardwood pulp, as well as synthetic fibers applied in a random matrix to a body having a fiber loading.

The invention discloses a brake disc type braking system of a traction type soil tank experimental platform. The brake disc type braking system comprises a rack, a traction wire rolling roller, a brake disc, a braking mechanism and a control module. The traction wire rolling roller is mounted on the rack through a bearing pedestal, and a rotating speed measuring instrument is mounted on a rotary shaft of the traction wire rolling roller. The rotating speed measuring instrument and the control module are in communication through a cable, and a speed measuring ring of the rotating speed measuring instrument and the rotary shaft synchronously rotate. The braking mechanism comprises a linear motor, a pull rod, a pressing rod, a first hydraulic cylinder and a braking module. The braking module comprises a shell, a second hydraulic cylinder, a reset spring, a first brake pad and a second brake pad. The invention further discloses a braking method of the brake disc type braking system of the traction type soil tank experimental platform. The magnitude of braking force can be controlled; on the one hand, stopping of an experimental platform trolley is guaranteed; and on the other hand, stable braking of the platform trolley is guaranteed, and braking impact force is reduced to the minimum to guarantee the safety of a sensor and other detecting equipment.

The invention discloses a lung function recovery training device. The lung function recovery training device comprises a gas guide assembly, a gas blowing mouth and a gas blocking assembly which is embedded in the gas guide assembly in a matched way; the gas guide assembly comprises a gas guide pipe, a clamping sleeve arranged on the side wall of the gas guide pipe and a balloon; a gas outlet is formed on the side wall of one end, far away from the opening end, of the gas guide pipe; a limiting plate which is arranged annularly is arranged at the gas outlet; the clamping sleeve is embedded onthe inner wall of the limiting plate in a matched way; the lower end of the balloon is fixed between the limiting plate and the clamping sleeve; the gas blocking assembly comprises a baffle and a pullrod; the baffle is arranged on the inner wall of the gas guide pipe in a fitting way; the pull rod is arranged on the end part of the baffle; a round through hole is formed in the end face of the baffle; and the inner diameter of the round through hole is more than the inner diameter of the clamping sleeve. The movable baffle is designed and is used for adjusting the overlapped area of a round formed by the round through hole and the inner wall of the clamping sleeve and controlling the size of the gas outlet, so that the gas blowing resistance is controlled, the lung function recovery training device is used for adapting to patients with different recovering degrees and the structural design is flexible.

The invention belongs to the field of farm chemicals and particularly relates to a wheat field weeding composite containing pyrazole ketones compounds and application thereof. The weeding composite comprises a weeding effective dose of an active ingredient A and a weeding effective dose of an active ingredient B, wherein the active ingredient A is one as shown in the following general formula (the general formula can be found in specification), R1 is hydrogen atoms, R2 is methyl, R3 is ethyoxyl, R4 is helium atoms and R5, R6 and R7 are alkyl groups; the active ingredient B is selected from one or more of the compounds including phenoxyalkanoic acids, ureas, triazole moiety ketone classes, diphenyl ethers, acetamides, aryloxy phenoxy propionic acid esters, ring adipic ketone classes, sulfonylureas, sulfonamides and phenyl pyrazole Lin classes. The composite can effectively prevent and eliminate diccot weeds in wheat fields and has the advantages that the weed spectrum is expanded, the synergistic effect is obvious, the dosage is reduced, the composite is safe to crops, and herbicide resistant weeds can be eliminated.

The invention discloses a preparation process for a carbon film tin-sprayed printed circuit board. The process comprises the following steps of performing pretreatment: before resistance welding and carbon film printing, carrying out mechanical polishing brushing and cleaning on a copper plate matrix by using a mechanical polishing, brushing, coarsening and cleaning machine; preparing a printed screen plate: coating a 220-mesh acrylic fiber screen plate with a blocking adhesive with the thickness of 30 [mu]m; performing printing and resistance welding: printing the printed screen plate with printing ink; printing the copper plate matrix with the printed screen plate with the printing ink; and after the copper plate matrix is printed, performing resistance welding on characters; performingsolidifying and baking: adding the copper plate matrix into a seven-temperature-zone internal circulation hot air solidifying machine for performing solidifying; and performing tin spraying: performing the tin spraying on a copper plate substrate, and then performing cooling. The carbon film tin-sprayed printed circuit board prepared with the process is short in production period; high pollution of electroless gold plating is avoided; the difficulty that the copper surface of a common carbon film board is easy to oxidize is overcome; and the overall performance and reliability of the carbon film tin-sprayed printed circuit board are improved.

The centrifugal machine comprises a centrifugal machine body, a supporting plate, an observation window and a control box, the control box is connected to one side in front of the centrifugal machine body in an embedded mode, a shell cover is movably connected to the top of the centrifugal machine body, the observation window is connected to the middle of the top of the shell cover in an embedded mode, and a feeding port is connected to the top end of the shell cover in an embedded mode. The other side of the centrifugal machine body is fixedly connected with a supporting plate, the middle part in the centrifugal machine body is movably connected with a rotary drum, the middle part in the rotary drum is movably connected with a spiral blade, the spiral blade can stably and continuously push sediments when pushing the sediments, the separation effect is good, and the separation performance of the centrifugal machine body is reflected; the noise reduction and shock absorption layer embodies the safety of the centrifugal machine body, the water injection nozzle enables the solid-liquid separation effect to be more obvious, the separability of the centrifugal machine body is embodied, the liquid level adjusting piece can adjust the resistance encountered by the rotary drum during rotation, the rotating speed of the centrifugal machine body is increased, and the controllability of the centrifugal machine body is embodied.