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 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 luggage cloth winding device, and relates to the field of winding devices. An upper half drum is turned over, cloth winding rollers sleeve a plurality of horizontal support rods, the horizontal support rods always have outward tension under the action of a spring I, the cloth winding rollers can be fixed, a cloth head is pulled to a fixed notch, a fixing mechanism and thecloth head are pressed to the fixed notch to achieve fixation, the horizontal support rods are provided with outer circular surfaces, and the outer circular surfaces are provided with rolling columnswith plastic washers, so that the cloth winding rollers can easily move forwards in the direction of the horizontal support rods, but the degree of freedom perpendicular to the rotation of the horizontal support rods is limited by the resistance provided by the plastic washers, after completion, the fixing mechanism is pulled out through a pull-out ring and replaced with a new cloth winding roller, and a lifting mechanism is arranged on supporting legs, so that the height of guide rollers are adjustable, and the use is more convenient.

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 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.

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.