71results about How to "Large variable range" patented technology

A phase shifter-attenuator system having: a controller for producing a digital word representative of a predetermined phase shift and attenuation provided to an input signal; and a phase shifter-attenuation section. The phase shifter-attenuation section includes: a phase rotator for providing one of a plurality combinations of phase shifts-attenuation states to the input signal selectively in accordance with one portion of the produced digital word; and an attenuation section for distributing the plurality of combinations of phase shift-attenuation states over a selected range of attenuations, such range being selected in accordance with a second portion of the produced digital word. The phase shifter-attenuator section provides one of a plurality of combinations of phase shift-attenuation states to the input signal selectively in accordance with one portion of the produced digital word, the combinations being distributed over a range of attentions selected in accordance with a second portion of the digital word.

The invention discloses a high-accuracy broadband continuous adjustable real-time time delay line circuit, adopts a method of combining an active coarse adjustment time delay line with a passive fine adjustment time delay line and improves a bandwidth and a time delay range of the time delay line circuit. The active coarse adjustment time delay line comprises an active voltage control time delay unit and a path selection amplifier. The passive fine adjustment time delay line is formed by cascading a plurality of inductor and variable capacitor pairs, by changing a voltage control variable capacitance value, delay time of the fine adjustment time delay line is changed, and the delay time can make up resolution of coarse adjustment time delay, thereby implementing the delay time continuous change of a real-time time delay line. The real-time time delay line carries out time delay accurate control on active time delay units by a time delay calibration loop, so that time delay is not influenced by changes of the outside environment. The circuit has the advantages of high time delay resolution, wide time delay range, high anti-interference capacity, broadband, high integration, low cost and easiness for integration.

The invention discloses a frame-type variable capacitor and a preparation method, which belong to the technical field of micro-electromechanical system MEMS devices. The frame-type variable capacitor is characterized by consisting of three-dimensional comb-tooth-shaped drive electrodes and a three-dimensional comb-tooth-shaped adjustable capacitor and having a bi-directionally movable structure. High-frequency or radio frequency signals can be introduced by elongated and bended cantilever girders on a frame structure of the frame-type variable capacitor, so the rangeability of capacitance is low, while an absolute value is great; and the high-frequency or radio frequency signals can be introduced through a frame on the frame structure of the frame-type variable capacitor, so the rangeability of the capacitance is high, while the absolute value is small. Preferable design parameters of the variable capacitor are disclosed, and correspondingly, the preparation method is disclosed. The preparation method has the advantages of not only finishing control over a capacitance value, but also effectively improving a quality factor Q of the capacitor and the rangeability of the capacitance.

The invention discloses a cutting portion of a tunneling machine. The cutting portion is characterized in that front-surface hobbing cutters are mounted on the front surface of a cutter head, a cutter arm support is mounted on the back surface of the cutter head, a first retractable cutter arm, a second retractable cutter arm, a third retractable cutter arm and a fourth retractable cutter arm are mounted on the cutter arm support, and chamfering hobbing cutters are mounted on the first retractable cutter arm, the second retractable cutter arm, the third retractable cutter arm and the fourth retractable cutter arm; the first retractable cutter arm and the second retractable cutter arm are respectively parallelly retractably arranged along the positive and negative directions of an X axis, the third retractable cutter arm and the fourth retractable cutter arm are respectively parallelly retractably arranged along the positive and negative directions of a Y axis, and the rotation axis of the cutter head is perpendicular to a plane formed by the X axis and the Y axis. The invention further discloses the tunneling machine and a cutting method. The cutting portion, the tunneling machine and the cutting method have the advantages that the diameter of the cutting portion of the tunnel machine can be varied, so that the diameters of the sections of tunnels can be varied, chamfering operation can be implemented, and the cutting portion and the tunneling machine are high in variable amplitude; the chamfering diameters are large, so that personnel can assuredly pass the tunnels, and maintenance and gear replacement can be implemented.

The invention discloses a full-size low-rise-building wind load simulation system applicable outdoors. The full-size low-rise-building wind load simulation system comprises a wind tunnel and a rotarytable and a typhoon wind pressure measuring device which are arranged in the wind tunnel, the wind tunnel is mainly formed by a tunnel body, a drive system and a measurement control system, the typhoon wind pressure measuring device is arranged above the rotary table and is driven to rotate in a deflection manner through the rotary table, the typhoon wind pressure measuring device is mainly formedby a roof, pitched roofs and eaves, the pitched roofs are hinged above the roof, the eaves are arranged at lower ends of the pitched roofs to be hinged with the roof, a lifting mechanism is connectedto lower sides of the pitched roofs, and a telescopic structure is hinged between the eaves and the roof. The full-size low-rise-building wind road simulation system is simple in structure and largein variable range, structural changes can be performed according to actual needs, features of low-rise-building wind load can be reflected visually, accurately and truly, wind tunnel tests and numerical simulation can be guided, and great significance of research results is achieved to wind-resistant research of low rise buildings of villages and towns in the southeast coastal areas of China.

The invention discloses a silane treating agent for metal surfaces. The silane treating agent is composed of, by weight, 20-30 parts of silane coupling agents, 20-30 parts of film-forming agents, 5-7 parts of complexing agents and 15-30 parts of purified water. According to the silane treating agent, the film-forming agents are thickening agents, and the complexing agents are sodium citrate, so that the silane treating agent has superior environment-friendly properties such as high ageing, hyper concentration, low carbon, energy conservation and no residue, phosphorus, zinc, chromium, fluorine or zirconium; a silane film has good effects of corrosion resistance property and adhesion property.

The invention relates to a hydraulic closed type system motor characteristic testing test bench. A hydraulic closed type system loop and a load loading loop; an electromotor a is connected with a transfer case, and power is divided into two; one shaft directly drives a plunger variable pump, and another shaft directly drives an oil supplementing pump; a plurality of two-position two-way reversing valves are each connected with a hydraulic driving motor in parallel; a first executing element comprises the hydraulic driving motors; a first auxiliary element comprises an oil tank and an oil supplementing filter; a first measuring element comprises a torque and rotating speed measuring instrument; a second power element comprises an electromotor b and a loading gear pump; a second control element comprises a three-position four-way proportional reversing valve and a plurality of proportional overflow valves; the proportional overflow valves are connected in parallel and are each connected with an oil outlet of a load motor, and the oil outlets are connected with the oil tank; and a second executing element comprises the plurality of load motors. According to the hydraulic closed type system motor characteristic testing test bench, the hydraulic closed type system motor characteristic is tested, and characteristic curves of a torque, a rotating speed and the like of a hydraulic closed type system motor under different loading manners are acquired.

The invention provides a multi-device management method and system based on a management information base (MIB). The method includes that multiple devices are classified; common characteristic of the multiple devices and a unique characteristic of each category of devices are extracted; an MIB tree is established according to the common characteristic and the unique characteristics, and a network management system (NMS) manages the multiple devices through the MIB tree. The establishment of the MIB tree includes that the NMS serves as a root node; all devices with the common characteristic serve as a first child node, and the common characteristic serves as node content to be written in the first child node; each category of devices with the unique characteristic serves as a second child node, and the unique characteristics serve as the node content to be correspondingly written in the second child nodes by an extensive markup language (XML) grammar. According to the multi-device management method and system based on the MIB, the XML extendibility is applied to expression of the node content of the MIB tree, the high expression efficiency of the MIB tree can be achieved, and the NMS efficiency of managing the devices is greatly increased.

The invention discloses a draft drainage device for a ship, which comprises a main water inlet pipe and a main drainage pipe, and one end of the main water inlet pipe and the main drainage pipe is provided with a disc-shaped limiting plate with an integral structure with it, so that The center of the main water inlet pipe is provided with a first main hollow structure and a second secondary hollow structure, the center of the main drainage pipe is provided with a second main hollow structure, and the center of the main water inlet pipe is located at the The area between the first main hollow structure and the second secondary hollow structure is provided with a turbine installation space communicating with them, and the main water inlet pipe is penetrated by a main rotating shaft at both ends of the turbine installation space. The present invention can not only realize the effect of draft, but also realize the effect of drainage. In addition, the device can not only change the efficiency of draft, but also realize the efficiency of drainage, so that the adjustment between draft and drainage has variability, and the variable range is wide. Strong practicality.

The invention discloses a device and method for synergistically preventing and controlling comprehensive mechanized coal mining face magnetized surfactant gas and coal dust. The device comprises a solution compounding device, a magnetized water generating device, a pressurizing device and a spraying and injecting device, wherein the solution compounding device is connected with the magnetized water generating device through a pipeline, and the pressurizing device is respectively connected with the magnetized water generating device and the spraying and injecting device; a surfactant preparation device comprises liquid storage tanks, a rotor flow meter, a pressure pump and a main pipeline, the liquid storage tanks are connected with the rotor flow meter, the rotor flow meter is communicatedwith the main pipeline through the pressure pump, and the main pipeline is communicated with an external water supply system; and the plurality of liquid storage tanks are arranged along the liquid flowing direction of the main pipeline. According to the device and method, cooperative prevention and control of the gas and coal dust are achieved, the dust concentration can be effectively controlled while gas desorption is restrained and the gas concentration is reduced, and the working environment of a working face is improved; and the purpose that one device has multiple functions is achieved, cost is saved, and energy is saved.

The invention discloses an ink cavity structure of a sprayer of an ink-jet printer. Spray holes used for spraying ink droplets out are formed in the sprayer. At least two ink cavities are formed in the sprayer, and two independently-controlled piezoelectric ceramic pieces are mounted on the wall of each ink cavity. According to the technical scheme, due to the fact that the structure that one ink cavity is provided with the two independently-controlled piezoelectric ceramic pieces is adopted, the changing range of the sizes of sprayed ink droplets is larger.

The invention discloses a method for preparing a biological organism optical bionic material and a model prepared by thereof. The material has an absorbing coefficient within 0.1-10 cm<-1> and a scattering coefficient within 1-10000 cm<-1>. The method comprises the following steps of: A. providing matrix resin with the transmittance greater than or equal to 60% by measuring a thin plate with the thickness of 1.0 mm on a 600-1000 nm near-infrared light area; B. preparing an absorption body by mixing the matrix resin and an absorbing agent, and determining the value of an absorption constant Ka; C. preparing a scattering body by mixing the matrix resin and a scattering agent, and determining the value of a scattering constant Ks; D, preparing the biological organism optical bionic material according to the determined values of Ka and Ks. The invention has the advantages of simple process and convenient operation; and the prepared model has uniform and stable optical property, is easy to process into various shapes, and can be repetitively used.

The invention provides a temperature compensated crystal oscillator that can obtain a large variable range and that can obtain high temperature stability. This temperature compensation system employs a configuration comprising a oscillation circuit 12 including a crystal vibrator 11 having a piezoelectric element excited in a given frequency and an oscillation amplifier that excites the piezoelectric element by flowing a current to the piezoelectric element, a vibrator current control circuit 13 that controls the current of the crystal vibrator, a temperature compensation voltage generation circuit 15 that compensates for temperature characteristics of the crystal vibrator 11, and an external variable capacitance diode 17 that changes the oscillation frequency of the oscillation circuit 12 using an external variable voltage controller 16. The vibrator current control circuit 13 comprises a variable capacitance diode 14 that controls the vibrator current, and capacitors 1 to 3.

A control device is disclosed which can obtain increased fuel economy performance depending on a kind of fuel in a vehicle having an internal combustion engine and an electric motor when the kind of fuel supplied to the internal combustion engine is altered. A determining vehicle speed (V 1 ) and determining output torque (T 1 ), representing a boundary value with which a step-variable control region and a continuously variable control region of a shifting mechanism ( 10 ) are demarcated, are altered such that the higher the mixing ratio of ethanol, the lower will be the determining vehicle speed (V 1 ) and determining output torque (T 1 ). Therefore, the determination is made whether to operate a first electric motor (M 1 ) depending on the mixing ratio of ethanol, making it possible to obtain increased fuel economy performance in line with the mixing ratio of ethanol.

The invention discloses a facility for environmentally friendly paint. The facility comprises a feed pipe part and a discharging pipe part; one end of the feed pipe part and one end of the dischargingpipe part are provided with clamping plates which are fixedly arranged on the ends, the middle part in the feed pipe part is provide with a first cavity and a second cavity, and the middle part in the discharging pipe part is provided with a third cavity; the middle part in the feed pipe part is provided with an installing chamber between the first cavity and the second cavity, and parts of the feed pipe part at double ends of the installing cavity is penetrated by a rotating rod. The product can realize charging and discharging effects, in addition, the apparatus can change charging efficiency, realize discharging efficiency, so that regulation and control between charging and discharging have changeability, changing scope is wide, and practicality is high.

The invention relates to a meshed rapid prototyping method. The meshed rapid prototyping method comprises the following steps of: (1) acquiring the three-dimensional model of an object to be processed; (2) dispersing the three-dimensional model into meshed units and carrying out simulation analysis, wherein the meshed units are basic manufacturing units, and the basic manufacturing units comprise sheet pieces and rod pieces for connecting with the sheet pieces; (3) cutting plate materials and wire materials to respectively form the sheet pieces and the rod pieces of the basic manufacturing units; and (4) connecting the sheet pieces with the rod pieces in the basic manufacturing units to finish the rapid prototyping of the object to be processed. The invention provides the meshed rapid prototyping method through which the rapid prototyping of large-sized structures can be finished, the rapid prototyping can be truly achieved, and the effect of the rapid prototyping of large-scale molds or parts is achieved.

This invention relates to an oscillation circuit, an electronic apparatus, and a moving object, which can expand the change range of a capacitor while guaranteeing linearity of a changeable capacitive member and inhibit the increase in the power consumption and the circuit scale. An oscillation circuit is connected to a resonator element (crystal resonator) and oscillates a resonator element to output an oscillation signal. The oscillation circuit includes an amplification element (inverter), and a set of variable capacitive elements having at least two variable capacitive elements, which are connected to an oscillation loop from an output to an input of the amplification element and the capacitance values thereof are controlled with potential differences between reference voltages and a variable control voltage. In each variable capacitive element of a set of variable capacitive elements, the common control voltage is applied to one terminal, and the reference voltage which differs between the variable capacitive elements is input to the other terminal.

The invention discloses a novel water suction and drainage device for ships. The device includes a main water inlet pipe and a main drainage pipe, disk-shaped limiting plates are integrated with and arranged on one end of the main water inlet pipe and one end of the main drainage pipe respectively, a first main hollow structure and a second auxiliary hollow structure are arranged at the center ofthe interior of the main water inlet pipe, and a second main hollow structure is arranged at the center of the interior of the main drainage pipe; a turbine installation space communicated with the first main hollow structure and the second auxiliary hollow structure is formed in the portion, between the first main hollow structure and the second auxiliary hollow structure, of the center of the interior of the main water inlet pipe, and the portions, at both ends of the turbine installation space, of the main water inlet pipe are penetrated through by a main rotating shaft. Not only can a water suction function be achieved, but also a drainage function can be achieved. Additionally, the device can not only change the water suction efficiency but also improve the drainage efficiency, so that the regulation and control between the water suction function and the water drainage function are changeable, the changeable range is wide, and the practicability is high.

The invention discloses a signal reading circuit, which comprises an amplifying circuit and a filtering circuit. The amplifying circuit comprises a single-carrier integrating circuit and a dual-carrier integrating circuit, the single-carrier integrating circuit and the dual-carrier integrating circuit are arranged in parallel, the input end of the single-carrier integrating circuit or the dual-carrier integrating circuit is connected with an input signal, and the output end of the same is connected with the input end of the filter circuit; the filter circuit comprises a low-pass filter, a high-pass filter, a band elimination filter and a band-pass filter, which are arranged in parallel, wherein the input ends of the low-pass filter, the high-pass filter, the band elimination filter and the band-pass filter are respectively connected with the output end of the single-carrier integrating circuit or the dual-carrier integrating circuit. According to the invention, the amplification circuit and the filter circuit are connected in series, and a plurality of signal adjusting ranges are realized by adjusting different circuit structures; wherein different circuit structures can be connected by rotating different switches to be closed; in addition, the flexibility is good and the parameter variable range is large.