70results about How to "Constant ratio" patented technology

Holographic and diffractive security devices and documents carrying security devices as well as system, apparatus, and method for making and using security devices. Security devices provide at least one type of security feature in form of secret, hidden, or covert security feature, not visible to a normal unaided human eye. Covert security features may be any graphic or symbolic representation. One or multiple security features may be provided on any single security device in any combination. Covert feature is revealed either when a decoder device is used with the security device, or when the security device is oriented and viewed in predetermined manner. Embodiments may provide a second overt or non-covert security device in the form of a diffractive or holographic image or graphic that is visible to the unaided eye without use of any decoder or special viewing conditions.

A braking system for a vehicle is described, including a hydraulic service braking system and an electric service braking system having wheel brakes, to which braking pressure is applied when a brake pedal is operated. To maintain essentially constant vehicle braking behavior during a change in the braking-force distribution between the hydraulic and the electric service braking systems, it is proposed to provide a control unit, which is capable of varying the braking-force distribution and to equip the hydraulic service braking system with a braking pressure modulator that is controlled by the control unit and is able to effect a variable braking-force distribution as a function of the control by the control unit.

Methods for characterizing a biochemical reaction and analysis of reaction products by establishing continuously variable concentration gradients of one or more reagents of the biochemical reaction are provided. Methods for determining mechanism of inhibition or activation, potency of inhibition or activation, or both of an enzyme inhibitor or activator, respectively, are also provided. The continuously variable concentration gradients can be established in a microfluidic chip.

A drive controller arranged to provide electrical power from a power supply to a machine or load over a long AC power cable of the order of kilometers. The drive controller is arranged with circuits and/or control processes to provide AC current at a constant ratio of voltage and frequency to said machine or load. The drive controller maintains voltage and frequency at the machine terminals despite fluctuations in voltage and/or frequency that would ordinarily be caused by the load. This is done by estimating the voltage and current at the machine terminals and adapting the drive controller output accordingly to actively vary the converter output dependent on the load of the machine or other load. In other aspects of the invention a method and a computer program for carrying out the method are described.

Crest factor reduction algorithms described herein may be used to improve power amplifier efficiency during low signal power conditions compared to traditional static threshold techniques. Techniques described herein insure that the signal power level at the output of the crest fact reduction block is held constant relative to the input power level under all signal power level conditions. Two different solutions may be implemented together or separately to achieve the desired conditions. The first technique provides constant ratio between input power and output power. Constant ratio of peak and average output levels keeps the amount of crest factor reduction applied to the signal constant, irrespective of the signal power level. A second technique is to hold signal power level constant in respect to the amount of crest factor reduction applied.

A PWM signal generation circuit and a PWM control circuit are provided in which the duty ratio is easily changed and which can also avoid adverse impact from ambient temperature changes and the like. At the beginning of charging a capacitor with a current flow, a voltage level at a connection point between the negative input terminal of a comparator and the capacitor is still below a charging threshold. When the charging threshold is exceeded, the comparator is inverted to a low state and a current flows into an output point of the comparator to start discharging the capacitor. At the beginning of discharging from the capacitor, the voltage level at the connection point is still above the discharging threshold. However, when the voltage level falls below the discharging threshold, the comparator returns to a high state, and the charging operation again takes over.

The invention discloses a sand charging device used during fracturing or slotting under a coal mine and a sand charging control method. The device comprises a water inlet pipe, a mixing pipe and a water outlet pipe which are sequentially connected, wherein a first electric valve, a first digital pressure meter, a first electromagnetic flowmeter are arranged on a pipeline of the water inlet pipe; an outlet end of the water outlet pipe is connected with a medium inlet of a medium booster pump; a check valve, a second digital pressure meter and a second electromagnetic flowmeter are arranged on a pipeline of the water outlet pipe; a hopper for accommodating sand is communicated with the upper part of the mixing pipe through a sand feeding pipe, and an electric unloading valve and an electric gate valve are arranged on a pipeline of the sand feeding pipe; the first electric valve, the electric unloading valve and the electric gate valve are anti-explosive; and the water inlet pipe, the mixing pipe and the water outlet pipe are respectively fixed on a flat mine vehicle. By the device, the sand charging time and sand charging amount are controlled by the conventional control technology. The sand charging device is simple in structure, small in size and safely used; and by the method, the coal seam cracking efficiency can be improved, and an anti-reflection effect of cracked coal and rock mass is guaranteed.

The invention discloses a method for controlling the direction of a solidification structure of a cast ingot through electricity conductive crystallizer electroslag remelting and belongs to the technical field of metallurgy. The method comprises the steps that (1) a slag material with the high conductivity is prepared and then baked; (2) the filling rate and the insertion depth of an electrode are determined, and a base wad, an arc striking agent and an electricity conductive crystallizer are right placed; and (3) a path of an electric current flowing through a power source, the consumable electrode, the slag material, a bottom water tank and the power source is selected, and arc striking, material charging and slag melting are conducted; after the slag material is melted down, a remelting electric current and the remelting voltage are set; the path of the electric current is set through closing of a switch in the electroslag remelting process, the distribution ratio of electric currents flowing through the crystallizer and the bottom water tank is controlled, the shape and the depth of a metallic molten pool are changed, and the direction of the solidification structure is controlled; and in the later period of remelting, electricity is cut off after electroslag remelting feeding operation, cooling is conducted, and the remelted cast ingot is obtained. According to the method for controlling the direction of the solidification structure of the cast ingot through electricity conductive crystallizer electroslag remelting, a slag system with the high conductivity distribution ratio is adopted, and the tendency of axial crystallization of the solidification structure of the cast ingot is improved; and the crystallization direction of the solidification structure of the cast ingot is controlled in the remelting process, and the prepared cast ingot has good surface quality.

An adjustable control pedal includes an upper arm and a lower arm carrying a pedal. The lower arm can be selectively moved relative to the upper arm to adjust the position of the pedal between a forward position and a rearward position. A control pin is operably connected to the upper arm for rotation with the upper arm to supply a control signal when force is applied to the pedal. An adjuster is operably connected to the control pin to adjust the position of the control pin relative to the pivot axis so that a ratio of a distance between the pivot axis and the pedal and a distance between the pivot axis and the control pin remains constant as the pedal is adjusted between the forward position and the rearward position.

The invention provides a creep aging bidirectional tension-compression testing device which comprises an upper component, a lower component, a guide column component as well as a temperature box, wherein the upper component and the lower component are arranged according to a same central axis; the guide column component is arranged between the upper component and the lower component; the lower component and the upper component are respectively connected with a lower connecting rod and an upper connecting rod of a tension machine; the upper connecting rod is used for providing upright tension to the upper component; a second groove for holding a cross test piece is formed in the upper surface of the lower component; sliding grooves are respectively formed in end parts of four free ends of the second groove; sliding block components are arranged inside the sliding grooves; the guide column component comprises a straight guide column and an inclined guide column from top to bottom in a serial connection manner; upper and lower ends of the straight guide column are respectively fixed with the upper component and the upper end part of the inclined guide column; the lower part of the inclined guide column and the free ends of the cross test piece are both connected with the sliding block components; and the temperature box is used for providing different temperatures. By adopting the device, testing of bidirectional tension, bidirectional compression and tension and compression upon the cross test piece can be carried out at different temperatures.

The invention relates to a method for controlling homogeneity of a fluorescent-whitened polyester staple fiber product, which comprises the following process procedures of fusing and extruding a PBT (polybutylece terephthalate) fluorescent-whitening master batch by a screw extruder, quantitatively adding the extrudate to a PET (Positron Emission Tomography) fusant of a normal PET production and delivery pipeline through a first metering pump and a master batch fusant pipeline, pressurizing the extrudate through a booster pump to lead the extrudate to enter a fusant cooler to be cooled to normal spinning temperature, then leading the cooled extrudate to enter the fusant pipeline, mixing the extrudate through a static mixer to make the extrudate into a blending fusant of the PBT fluorescent-whitening master batch and PET, leading the blending fusant to enter a spinning box, metering the blending fusant by a second metering pump, leading the blending fusant to enter a spinning component for spinning, cooling and oiling spun silks, and dragging the spun silks by a dragging roller and a sunflower wheel to be sent into a silk holding barrel. The rotation speed of the booster pump and the first metering pump adopts signal interlock control; the master batch fusant pipeline and the first metering pump are respectively provided with a heat tracing temperature control system; and heat tracing media of the heat tracing temperature control systems adopt the primary heating medium series control of a heat tracing temperature control system of a normal PET fusant pipeline. By the control method, the addition proportion of a fluorescent whitening ingredient can be ensured to be a set value when production capacity is changed.

The invention provides a water power proportioning pump. An inner cover is arranged in a lower outer shell and divides the lower outer shell into an inner cavity chamber and an outer cavity chamber. An inner cavity of a suction and injection device communicates with the outer cavity chamber. The inner cavity chamber and the outer cavity chamber communicate with an inner cavity of an upper outer shell. A water stop ring plate is integrally arranged on the outer edge of the opening end of an outer piston. The bottom of an upper long rod is connected with a sliding block. A through hole is formed in the middle portion of the sliding block and composed of an upper through hole body section and a lower through hole body section. The diameter of the upper through hole body section is smaller than that of the lower through hole body section. A barb is arranged at the lower end of the upper long rod and penetrates the upper through hole body section in an inserted manner to stretch into the lower through hole body section. One end of a reversing telescopic piece abuts against an arc concave groove, and the other end of the reversing telescopic piece abuts against an arc groove. An upper blockage piece used for blocking a liquid outlet hole is arranged on the outer edge of the upper end of an inner piston, and a lower blockage piece used for blocking a liquid inlet hole is arranged at the bottom of the inner piston. The water power proportioning pump has the beneficial effects that according to the chemical adding mode, chemical adding is achieved outside a cavity, the liquid chemical does not enter the chemical adding device cavity, and the cleaning frequency can be reduced.

The invention discloses a piston type fertilizer sucking and chemical feeding device achieving an accurate proportion adjustment function and a fertilizer sucking and chemical feeding method. The piston type fertilizer sucking and chemical feeding device comprises a shell, a water inlet and a water outlet, wherein the water inlet and the water outlet are communicated with the shell. A water inlet cavity communicated with the water inlet is formed in the shell. A fertilizer mixing cavity used for mixing fertilizer and water is formed in the shell and communicated with the water outlet. A fertilizer feeding system used for feeding the fertilizer into the fertilizer mixing cavity is arranged below the fertilizer mixing cavity. The feeding amount of the fertilizer is adjustable. A piston assembly used for controlling water to enter the fertilizer mixing cavity from the water inlet is arranged above the fertilizer mixing cavity. The piston type fertilizer sucking and chemical feeding device is arranged in a water pipe, water flow in the water pipe drives the piston type fertilizer sucking and chemical feeding device to work, and power source drive is not needed. The proportion of the fed fertilizer can be adjusted according to actual conditions. No matter how the water pressure and the water amount in the pipe change, the amount of sucked chemicals is always in direct proportion to the volume of water entering the device, and it is guaranteed that the proportion of mixed liquid is constant.

The invention relates to an energy-saving environment-friendly commercial stove. The problem that in the prior art, the gas utilization rate is low is mainly solved. The stove comprises a hearth whichis provided with a supporting frame, and the lower portion of the supporting frame is provided with a supporting groove; the outer side surface of the supporting frame is annularly and uniformly provided with first air inlets, and the supporting frame is provided with an annular air outlet; the supporting frame is internally provided with a circulating channel communicating with the first air inlets and the air outlet; the bottom of the hearth is provided with a through hole, ad a combustor is arranged at the through hole and provided with a kindling gas feeding pipe, a main fire gas feedingpipe and an air feeding pipe; a fire collecting ring surrounding the combustor is arranged in the hearth; the bottom of the hearth is provided with an outlet, a fire collecting plate is arranged in the hearth, and the hearth, the supporting frame, the fire collecting plate and the fire collecting ring form a cavity; the air outlet and the outlet both communicate with the cavity; the outlet communicates with the input end of an exhaust fan, the output end of the exhaust fan communicates with the air feeding pipe, and a fireproof explosion-proof device is arranged between the exhaust fan and theair feeding pipe.

The invention provides an SNCR (Selective Non-Catalytic Reduction) denitrification technology test bench. The SNCR denitrification technology test bench comprises a gas distribution and intake system,a plunger flow reactor system and a sampling and testing system, wherein the plunger flow reactor system comprises a furnace tube with an electric heater arranged outside; a fan for air extraction isconnected to the bottom of the furnace tube; the gas distribution and intake system comprises a gas distribution cylinder consisting of two groups of gas cylinders; the first group comprises a nitrogen cylinder, an oxygen cylinder, a carbon dioxide cylinder and a nitric oxide cylinder; the gas outlet of each gas cylinder is connected with a pressure relief valve and a mass flowmeter in sequence,and then connected in parallel with a metering steam generator to the inlet of a mixed gas preheater; the outlet of the mixed gas preheater is connected with the furnace tube through a mixed samplinggun; the second group comprises a nitrogen cylinder and an ammonia cylinder of which the gas outlets are connected with the pressure relief valve and the mass flowmeter in sequence respectively, and then connected with the furnace tube through an ammonia gas sampling gun; and the sampling test system is connected with the furnace tube, and used for measuring the concentration of ammonia in flue gas after denitrification. By simulation of the flue gas with gas distribution, the flue gas composition can be stabilized, and the test conditions are highly repeatable.

The invention discloses a water purification system with a constant pure water/wastewater proportion and a water purifier. The water purifier is used for desalting and water purifying through the water purification system with a constant pure water/wastewater proportion; the water purification system is provided with an EDR unit, a concentrated water plug for controlling the flow rate of concentrated water, a flow regulating valve for regulating the flow rate of pure water and a booster pump for increasing the flow rate of raw water; the booster pump is assembled at the communication part of the raw water pipeline and the water inlet of the EDR unit; the first water outlet of the EDR unit is connected with a concentrated water pipeline, the concentrated water plug is assembled at the pipeline of the concentrated water pipeline, the second water outlet of the EDR unit is communicated with the water inlet end of the flow regulating valve through a pipeline, the water outlet end of the flow regulating valve is communicated with a pure water pipeline, and the water inlet of the EDR unit is communicated with the raw water pipeline. A certain pressure is applied to raw water through thebooster pump arranged in front of the EDR unit, and the flow of produced water of the EDR unit is regulated and controlled in combination with a flow regulating valve at a water outlet of the EDR unit, so that the pure water/wastewater proportion of the produced water of the water purification system is constant, and the user experience is improved.

An antenna apparatus includes: a ground substrate; and a loop antenna having first and second polarized wave surfaces, which are perpendicular to the substrate. The substrate provides an antenna, which is excited and vibrated together with the loop antenna. The antenna has a first polarized wave component in parallel to the first polarized wave surface and a second polarized wave component in parallel to the second polarized wave surface. A polarized wave ratio between the first polarized wave component and the second polarized wave component in the substrate is substantially equal to a polarized wave ratio between the first polarized wave surface and the second polarized wave surface in the loop antenna.

The invention relates to a fertilizing device, in particular to a proportion decreasing fertilizer device: a fertilizer solution is loaded into a deformable fertilizer bag, and the fertilizer bag is placed in a closed pressure tank, the pressure tank is connected to a water main and a fertilizer bag outlet is connected to a water pipe. An adjustable pressure reducing valve is arranged at the middle of two connectors of the water main to form a certain pressure difference between the two ends, when the tank body is full of water, the pressure in the closed pressure tank is greater than the pressure of a pipe at an outlet of the fertilizer solution, and the fertilizer solution can be dripped into the water pipe. The proportion decreasing fertilizer device also discloses an application methodthereof. The proportion decreasing fertilizer device has the advantages of simple structure, uniform fertilization, low-energy consumption and controllable proportionality.

The invention discloses a manufacturing method for phenol and acetone, and relates to the technical field of chemical raw material synthesis. The manufacturing method comprises the steps that improvement is conducted on the basis of an existing method that phenol and acetone are synthesized through isopropyl benzene oxidation and selective acid catalytic decomposition, isopropyl benzene obtained after alkalization and pressurized air are subjected to a countercurrent contact reaction in an oxidation tower, falling film evaporation and two times of concentration are conducted, and then refinedcumene hydroperoxide is obtained; the refined cumene hydroperoxide is decomposed into the phenol and acetone in a moving bed reactor through catalysis of an acid resin catalyst, and then the refined phenol and acetone are obtained through water washing for deacidification, acetone roughing, acetone refining, coke cutting and secondary dealkylation. The manufacturing method has the good selectivityand yield of the phenol and acetone, the reaction conditions are not harsh and easy to control, the resin catalyst can be reused multiple times after collection and regeneration, and thus the production cost is lowered.