47results about How to "Extended decay time" patented technology

In a method for checking a first ultrasonic sensor of a motor vehicle for an occlusion, a measuring signal of the first ultrasonic sensor is acquired by an evaluation unit, and from the measuring signal, a decay time of a natural oscillation of the diaphragm of the first ultrasonic sensor, brought about by an excitation pulse, is ascertained. From the measuring signal of either the first ultrasonic sensor or a second ultrasonic sensor, an echo produced by an object located in a sensing range of the first ultrasonic sensor is ascertained, and a distance value of the object is determined on the basis of the echo. An occlusion is signaled if the decay time is less than a predetermined threshold value which would be exceeded if ice and / or dirt were to adhere directly to the diaphragm, and if the distance value is less than a predetermined maximum value.

The invention relates to slowly-releasing health-care liquid special for directly-spraying landscape plants and a preparation method and use thereof; fertilizer on the market is highly-enriched fertilizer and is mainly used for agricultural production; the fertilizer needs to be diluted 300-2000 times of spray and is characterized by difficult use and easy waste; a product with lower concentration is provided by the invention; the product is directly sprayed to garden flowers, bonsai, lawn and family crops by non-professionals without dilution; the concentration of film forming material provided by the invention is 500-1000 times higher than that of highly-enriched fertilizer so as to form relatively thick breathable film; nutrient substance is contained in films so as to achieve slowly releasing effect and achieve healthy growth, green keeping and freshness retaining effect of the landscape plants; a relatively thick film has antibacterial action and has a certain pest-resistant effect; traditional fertilizer belongs to ''food'' of plants; the slowly-releasing health-care liquid is ''health care products'' of the landscape plants and is applied to the landscape plants such as flowers, bonsai, seedlings, lawn and the like and is also suitably used for family crops which have view and admire as a main function.

A photoluminescent material has the characteristic of a long photoluminescence decay and has the general composition Ca3-x-m-nAxSc2-yMySi3-zEzO12:mCe3+,nMn2+, where A is at least one divalent cation including Sr, Ba or a combination of monovalent and trivalent cations including combinations of Li, Na, K, B, Al and Ga; M is at least one trivalent cation including Al, Ga, or a divalent cation including Mg, E is a combination of a trivalent and a pentavalent cation including B, Al, Ga, N and P, or a combination of monovalent and trivalent cations including Li, Na, K, B, Al, Ga, N and P. The A cation replaces Ca; the M cation replaces Sc, and E replaces Si. This Mn and Ce doped phosphor emits in the yellow to green with a peak at around 510 and / or 560 and 690 nm. The phosphor material has applications in LED illumination systems.

A surface polymer-assisted vertically aligned (SPA-VA) liquid crystal (LC) cell has a surface alignment layer of surface localized polymer nano spikes capable of controlling the pretilt angle of liquid crystal molecules and ensuring fast switching characteristics. The deposition of the polymer nanospikes as a part of the alignment layer is achieved by polymerizing a small amount of a reactive monomer in vertically aligned liquid crystal with or without an applied voltage. Due to the alignment of liquid crystal molecules by the surface alignment layers, the polymerized polymer acts as an internal surface to modify and control the field-induced reorientation of the liquid crystal molecules. The SPA-VA LC cell realizes a stable alignment and the considerable advantage of the formation of polymer spikes via UV irradiation on both substrates of the cell. Furthermore, the switch-off of a SPA-VA is fast due to the enhanced surface anchoring strength by the surface-localized polymer nano spikes.

In order to determine the orientation of the rotor of a brushless DC motor 100, a sequence of current pulses may be applied to the stator phases U, V, W by the respective drivers HS0, LS0, HS1, LS1, HS2, LS2. The current generated in the stator phases U, V, W in turn generates a current in a shunt resistor 110. The current in this shunt resistor 110 is monitored by use of a current voltage converter 120 and a comparator 130 to determine when it exceeds a predetermined threshold. The rise time until the threshold current is exceeded is recorded in capture unit 140. A processor unit 150 then calculates a scalar parameter SU, SV, SW for each respective stator phase U, V, W from the recorded rise times associated with each pulse. The orientation of the magnetic axis of the rotor can then be determined by consideration of the scalar parameters SU, SV, SW of each stator phase U, V, W, as the respective rise times of each pulse are determined by the inductive properties of the respective stator phases U, V, W, which in turn are dependent upon the orientation of the rotor.

The invention discloses a public deodorizing trash can, which comprises an outer cylinder shell and an inner cylinder arranged inside the outer cylinder shell, a filter screen is arranged at the bottom of the inner cylinder, and a sewage outlet is arranged at the bottom of the outer cylinder shell. Due to the addition of a filter screen at the bottom of the inner cylinder of the trash can, the present invention can filter the liquid garbage in the trash can and discharge it into the sewer pipe in time through the sewage outlet, leaving only solid garbage in the trash can, further destroying the The environment where bacteria breed further prolongs the decay time of garbage and reduces the emission of odor.

The invention discloses a preservative film for short-term storage of fruits and vegetables. A micro-foamed film body with a surface layer for slowing down water loss and adsorbing ethylene is formed on the preservative film, and the density of the film body is 0.5-0.9 g / cm<3>. The invention further discloses a preparation method of the preservative film for short-term storage of the fruits and the vegetables. The invention further discloses a preservative bag produced by using the components and the preparation method. By adopting the technical scheme of the invention, the film has sufficient adsorption capacity for ethylene gas wrapped in the film, and the adsorption capacity cannot be reduced obviously under natural ambient conditions, so that the speed of maturing and decaying the fruits and the vegetables wrapped by using the preservative film is effectively reduced, the decomposition time of the fruits and the vegetables is prolonged, the freshness of the fruits and the vegetables is guaranteed, and the decomposition of matured fruits and vegetables is also avoided; through the addition of catalysts, micro foams on the surface of the film body are promoted, the freshness of the fruits and the vegetables is guaranteed, and the maturity and decomposition of the fruits and vegetables cause by the concentration of the ethylene gas are also avoided.

The invention relates to a preparation method of a CsPb1-xZnxBr3 perovskite quantum dot. The method comprises the following steps: 1, mixing a cesium source, a lead source and a zinc source in a three-neck flask; then injecting oleic acid (OA), oleylamine (OLA) and 1-octadecene (ODE), under the protection of nitrogen atmosphere, performing heating and magnetic stirring to fully react, after the reaction is finished, applying ice-water bath treatment, performing centrifugal washing to obtain CsPb1-xZnxBr3 perovskite quantum dots, and finally dispersing the quantum dots into n-hexane to be stored. The CsPb1-xZnxBr3 perovskite quantum dot prepared by adopting the method has the characteristics of high crystallization quality, high PL luminous intensity and high PL quantum yield up to 57%, andcan be applied to the fields of illumination, display, photovoltaics and the like.

The invention discloses an air outlet structure with a low-noise speed increasing function and a drying device for an intelligent closestool. The air outlet structure with the low-noise speed increasing function includes a shell and a first air guiding unit; the shell includes an air inlet and an air outlet, and an air passageway connecting the air inlet and the air outlet; the air passageway is gradually tapered from the air inlet to the air outlet; the first air guiding unit is arranged at the air outlet, and an airflow accumulation area for attaching the airflow to the wall is formed between the first air guiding unit and the inner wall of the shell; and the airflow enters from the air inlet, and is ejected from the air outlet after increasing the speed in the airflow accumulation areaof the air passageway. The air outlet structure with the low-noise speed increasing function and the drying device for the intelligent closestool provided by the invention has a simple structure, a reasonable design and easy implementation, and realizes the effect of accumulating air-out, which improves the drying efficiency, has low noise, and is easy to satisfy the user experience.

The invention discloses a vertical rolling bearing equivalent friction coefficient measuring device. The vertical rolling bearing equivalent friction coefficient measuring device comprises a machine body, a sliding seat, a mandrel, two bearing pedestals, an annular counterweight part, a rotating speed sensor and a data acquisition / processing / calculation / display device; one bearing pedestal is fixedly connected with the machine body, and the other one is fixedly connected with the sliding seat; the two bearing pedestals are provided with inner cylindrical surfaces matched with the outer rings of tested rolling bearings respectively; the two inner cylindrical surfaces are coaxial; the two ends of the mandrel are provided with shaft shoulders used for mounting the inner rings of the tested rolling bearings respectively; the mandrel is provided with the annular counterweight part; the sliding seat axially and horizontally moves along the inner cylindrical surfaces of the two bearing pedestals under external force driving; the data acquisition / processing / calculation / display device is used for collecting and processing the angular speed signal, monitored by the rotating speed sensor, ofthe mandrel, and calculating the equivalent friction torque and equivalent friction coefficient of an tested rolling bearing and a B tested rolling bearing. The measuring device has the capability ofrapidly and precisely measuring the equivalent friction torque and equivalent friction coefficient of the rolling bearing.

The invention provides lithium manganate of a core-shell structure and a preparation method of the lithium manganate. According to the lithium manganate of the core-shell structure, a LiMn2O4 electrode material on the inner layer is separated from electrolyte, reaction between the electrode and the electrolyte can be inhibited, dissolution loss of manganese is reduced, the electrochemical performance and high-temperature performance are improved, and the problem that the cycle life of the battery made of a lithium manganate battery cathode material is short under the working conditions such as high temperature and large current is solved. The lithium manganate of the core-shell structure with the advantages of small impurity phases and high specific capacity can be prepared under relatively simple conditions by using low-price raw materials, the lithium manganate of the core-shell structure is simple in process, mild in conditions, low in energy consumption, low in cost and environmentally friendly, and large-scale production is easily realized. According to the core-shell structure, the crystal form of lithium manganate is effectively protected, and dissolution of bivalent manganese is relieved. Moreover, according to the super-capacitor performance of Co3O4, impact of large current on lithium manganate can be alleviated, and the fall time of lithium manganate is prolonged, so that the cycling stability of the battery is enhanced. When the temperature rises, the performance of the material is strengthened.

The liquid crystal display element includes: two transparent substrates; a liquid crystal composition sandwiched between the two transparent substrates and containing one or two or more liquid crystal compounds; and a polymer or copolymer that is included in the liquid crystal composition, the polymer or copolymer being a cured product of a polymerizable composition that contains one or two or more polymerizable compounds and a photopolymerization initiator having a maximum absorption wavelength peak at 310 nm to 380 nm. The content of the polymerizable composition is 1% by mass or more and less than 40% by mass based on the total weight of the polymerizable composition and the liquid crystal composition.

The present invention relates to a farmland straw treatment method, and belongs to the technical field of crop treatment. According to the present invention, a straw is divided into a root and a stem. The root is decayed by irrigation, is softened with the soil, and is dumped into a farmland; the stem is also decayed and mixed with soil by the action of microorganisms and enzymes, so that the soil is moistened, and then after water extraction and insolation, plants can be planted, so that other plants can be planted without moving the straws left in the farmland to home, thereby not only saving a lot of manpower and resources, but also accelerating the decay speed of the straws, moistening the soil, and turning the straws to a fertilizer for crops, and therefore, an effect of making the best of both worlds is achieved. The example demonstrates that the method provided by the present invention is novel and unique, not only saves manpower and resources and ultimately makes the straws be the fertilizer to moisten the soil, but also accelerates the decay time of the straws, so that the decay time of the straws is shortened by over 92%.

The invention discloses a method for improving shelf life of a bdellovibrio sp. microbial preparation. The method comprises the following steps: preparing the bdellovibrio sp. microbial preparation, mixing the bdellovibrio sp. microbial preparation with a protection agent belonging to different kinds and / or with different concentration, then filling with a DNB medium, so as to obtain a mixed solution; placing the mixed solution at 25 DEG C, 37 DEG C, 45 DEG C, 55 DEG C and 65 DEG C to perform accelerated testing; sampling regularly, and detecting the bdellovibrio sp. concentration in the mixed solution; utilizing Arrhenius equation and recorded data to calculated out the shelf life of the bdellovibrio sp. microbial preparation; and determining the effect of the protection agent by comparing the shelf life. The protection agent is at least one of monosodium glutamate, cane sugar, internal-compensation inositol, melitose, glucose and glycerin. By employing the method, the attenuation time of a high-concentration bdellovibrio sp. microbial preparation is obviously prolonged, and the shelf life of the bdellovibrio sp. microbial preparation is improved; and by comparing the quality-guaranteeing effect of different protection agents, an optimum quality-guaranteeing method is screened out.

The invention discloses an equivalent friction coefficient measurement device and method of a rolling bearing. The equivalent friction coefficient measurement device comprises a machine body, a sliding seat, two air flotation main shaft assemblies, a core shaft, a rotational speed sensor and a data acquisition / processing / calculation / display system, wherein each air flotation main shaft assembly comprises an air flotation main shaft matrix and an air flotation main shaft, one of the air flotation main shaft matrixes is fixedly connected with the machine body, the other one air flotation main shaft matrix is fixedly connected with the sliding seat, the two air flotation main shafts are coaxial, two ends of the core shaft are matched or connected with the two air flotation main shafts by conical surfaces or couplers, an inner circle of a measured rolling bearing is arranged at a shaft shoulder of the core shaft, the rotational speed sensor is used for monitoring angular speeds of the coreshaft or the air floatation main shafts, and the data acquisition / processing / calculation / display system is used for acquiring and processing angular speed signals, monitored by the rotational speed sensor, of the core shaft or the air flotation main shafts and calculating equivalent friction torque and an equivalent friction coefficient of the measured rolling bearing. The measurement device hasthe capability of rapidly and accurately measuring the equivalent friction torque and the equivalent friction coefficient of the rolling bearing.

This invention relates to an induced polarization spectrum analysis method for acquiring penetration rate of rock. The characteristics are the following: to gather induced polarization weakening spectrum down-well and get induced polarization relax time spectrum through multiple index weakening match; then to calculate the geometric average and arithmetic average of relax time and ground penetration rate curve with materials of porosity logging and experiment constants. It is with low well logging cost, large signal range, high signal-to-noise ratio and long weakening time and high accuracy of polarization ratio measuring.

In a method for checking a first ultrasonic sensor of a motor vehicle for an occlusion, a measuring signal of the first ultrasonic sensor is acquired by an evaluation unit, and from the measuring signal, a decay time of a natural oscillation of the diaphragm of the first ultrasonic sensor, brought about by an excitation pulse, is ascertained. From the measuring signal of either the first ultrasonic sensor or a second ultrasonic sensor, an echo produced by an object located in a sensing range of the first ultrasonic sensor is ascertained, and a distance value of the object is determined on the basis of the echo. An occlusion is signaled if the decay time is less than a predetermined threshold value which would be exceeded if ice and / or dirt were to adhere directly to the diaphragm, and if the distance value is less than a predetermined maximum value.

The invention provides a low-temperature spray fresh-keeping method capable of prolonging the moldy and rotten time of bayberry, said method comprising the following steps: S10, selecting fruit; S11, soaking fruit; S12, pre-cooling treatment; S13, spraying fresh-keeping; S14, packaging treatment . A low-temperature spray fresh-keeping method that can prolong the moldy and rotten time of bayberry provided by the present invention has the advantages of safety, reliability, non-toxicity and environmental protection, good fresh-keeping effect and long fresh-keeping time, and can not only reduce the loss of beneficial nutritional components of red bayberry, but also The invention can keep the red bayberry in good color, has wide sources of raw materials and low price, and is conducive to large-scale popularization.

The process produces a scintillation material of formula LnX3 or LnX3:D, wherein Ln is at least one rare earth element, X is F, Cl, Br, or I; and D is at least one cationic dopant selected from the group consisting of Y, Zr, Pd, Hf and Bi. The at least one cationic dopant is present in the scintillation material in an amount of 10 ppm to 10,000 ppm. The process includes optionally mixing the compound of the general empirical formula LnX3 with the at least one cationic dopant, heating the compound or the mixture obtained by the optional mixing to a melting temperature thereof, then growing the crystal or crystalline structure and cooling the resulting crystal or crystalline structure from a growing temperature to a temperature of 100° C. at a cooling rate of less than 20 K / h.

The invention discloses a friction nanometer generator and a preparation method thereof. The preparation method comprises the following steps: providing a metal electrode layer; preparing a lanthanum zirconium oxide intermediate dielectric layer on one side of the metal electrode layer by adopting a spin-coating method; preparing an electronegative friction layer on one side, deviating from the metal electrode layer, of the lanthanum zirconia intermediate dielectric layer by adopting a spin-coating method; providing a substrate; and preparing an electropositive friction layer on the back surface of the substrate, wherein the electric positive friction layer is arranged between the electric negative friction layer and the substrate, and a preset distance is arranged between the electric positive friction layer and the electric negative friction layer. According to the technical scheme, the zirconium lanthanum oxide intermediate dielectric layer and the electric negative friction layer are prepared through the spin-coating method, so the preparation process of the friction nano-generator is simple and controllable; therefore, low-cost and batch production of the friction nanometer generator is realized. Meanwhile, the lanthanum zirconium oxide intermediate dielectric layer is added, so the charge output characteristic of the friction nano generator is also improved, and the charge decay time is also prolonged.

The invention discloses a vertical rolling bearing equivalent friction coefficient measuring device. The vertical rolling bearing equivalent friction coefficient measuring device comprises a machine body, a sliding table, a mandrel, two bearing pedestals, a rotating speed sensor and a data acquisition / processing / calculation / display device, wherein one of the bearing pedestals is fixedly connectedwith the machine body, and the other one is fixedly connected with the sliding table; an A to-be-tested rolling bearing outer ring is arranged on a bearing pedestal shoulder which is fixedly connectedwith the machine body, and a B to-be-tested rolling bearing outer ring is arranged on a bearing pedestal shoulder which is fixedly connected with the sliding table; an A to-be-tested rolling bearinginner ring is arranged on the shaft shoulder at one end of the mandrel, and a B to-be-tested rolling bearing inner ring is arranged on the shaft shoulder at the other end of the mandrel; the sliding table is capable of horizontally moving along the axial direction of the inner cylindrical surface of the bearing pedestals under the guide of a guide component; and the data acquisition / processing / calculation / display device is used for collecting and processing the angular speed signal, monitored by the rotating speed sensor, of the mandrel, and calculating the equivalent friction torque and equivalent friction coefficient of the tested rolling bearing. The measuring device has the capability of rapidly and precisely measuring the equivalent friction torque and equivalent friction coefficientof the rolling bearing.

This invention discloses an organic light diode process method, which comprises the following steps: first to clear ITO glass base plate and use etching technique to process lattice pattern; second to deposit organic function layer and electrode in high vacuum conditions; third to do the oxygen and water proof seal process to the deposited thin film device, wherein in step two to join two or more than two kinds of electric light spectrum different visible light band object light material into the light layer visible wave band.

The invention provides a functional packaging film and a production process thereof. The functional packaging film comprises the following raw materials in parts by weight: 80-100 parts of polyethylene resin, 4-16 parts of carboxymethyl chitosan, 0.4-0.8 part of diacetyl tartaric acid ester of mono(di)glycerides, 3-6 parts of silica, 0.3-0.8 part of sodium starch octenyl succinate, 0.025-0.055 part of antioxidant, and 0.1-0.3 part of benzoic acid. The production process of the functional packaging film comprises the following steps: S1, weighing raw materials; S2, preheating and drying polyethylene resin; S3, preparing a functional composition by carboxymethyl chitosan and diacetyl tartaric acid ester of mono(di)glycerides; and S4, mixing the materials, and conducting granulation, drying and film blowing, so as to obtain the functional packaging film. The packaging film provided by the invention has excellent bacteriostasis and gas permeability, prolongs the preservation time of packaged objects, and has a simple production process.

The invention relates to the technical field of nuclear medicine, and relates to application of 18F-SFB-CML and a method for detecting atherosclerosis. Firstly, the invention provides the applicationof 18F-SFB-CML in preparing a product for detecting atherosclerotic diseases; the method for detecting atherosclerosis is further provided; the method is to use 18F-SFB-CML as a photographic developerto obtain the location, size, and vascular stenosis degree information of an atherosclerotic plaque by molecular imaging scanning. The 18F-SFB-CML as the photographic developer can accurately reflectthe size of the plaque and the vascular stenosis degree, and can effectively trace the atherosclerotic plaque.

The invention discloses a salt-containing freshwater fish feed. The weight ratio of each raw material component is as follows: 30-40 parts of cornmeal, 10-15 parts of sesame paste residue, 3-6 parts of bran, and 2-5 parts of buckwheat husk , 2-6 parts of peanut vine, 3-10 parts of walnut powder, 2-8 parts of bone meal, 0.2-0.8 parts of baking powder, 4-7 parts of salt, 3-8 parts of vegetable oil, 1-4 parts of 52° liquor, Shannai cloves 0.5-2 parts of concentrate, 2-5 parts of feed additives, and 50-90 parts of water. Through scientific preparation methods, the prepared feed is nutritious and can supplement the protein, vitamins and salts required for the growth of freshwater fish, and enhance freshwater fish. Physical fitness, thereby improving the immune system, enhancing physical fitness, improving disease resistance, and can make fish have high appetite, fast growth, delicious meat, and improve economic benefits.

The invention provides lithium manganate of a core-shell structure and a preparation method of the lithium manganate. According to the lithium manganate of the core-shell structure, a LiMn2O4 electrode material on the inner layer is separated from electrolyte, reaction between the electrode and the electrolyte can be inhibited, dissolution loss of manganese is reduced, the electrochemical performance and high-temperature performance are improved, and the problem that the cycle life of the battery made of a lithium manganate battery cathode material is short under the working conditions such as high temperature and large current is solved. The lithium manganate of the core-shell structure with the advantages of small impurity phases and high specific capacity can be prepared under relatively simple conditions by using low-price raw materials, the lithium manganate of the core-shell structure is simple in process, mild in conditions, low in energy consumption, low in cost and environmentally friendly, and large-scale production is easily realized. According to the core-shell structure, the crystal form of lithium manganate is effectively protected, and dissolution of bivalent manganese is relieved. Moreover, according to the super-capacitor performance of Co3O4, impact of large current on lithium manganate can be alleviated, and the fall time of lithium manganate is prolonged, so that the cycling stability of the battery is enhanced. When the temperature rises, the performance of the material is strengthened.

The invention relates to a reduction cylinder for a deep pool type low-temperature heating reactor. The reduction cylinder comprises a cylinder body provided with a water inlet and a water outlet; thewater outlet is connected with a loop main pipeline; an internal partition plate capable of prolonging reduction time of fluid in the cylinder body is arranged in the cylinder body. The reduction cylinder has the advantages that the internal partition plate buffers fluid at the water inlet, flowing time of the fluid in the cylinder body is prolonged, and therefore the reduction time of cooling water is effectively prolonged.

The invention discloses a vertical rolling bearing equivalent friction coefficient measuring device. The vertical rolling bearing equivalent friction coefficient measuring device comprises a machine body, a sliding table, a mandrel, two bearing pedestals, a rotating speed sensor and a data acquisition / processing / calculation / display device, wherein one of the bearing pedestals is fixedly connectedwith the machine body, and the other one is fixedly connected with the sliding table; an A to-be-tested rolling bearing outer ring is arranged on a bearing pedestal shoulder which is fixedly connectedwith the machine body, and a B to-be-tested rolling bearing outer ring is arranged on a bearing pedestal shoulder which is fixedly connected with the sliding table; an A to-be-tested rolling bearinginner ring is arranged on the shaft shoulder at one end of the mandrel, and a B to-be-tested rolling bearing inner ring is arranged on the shaft shoulder at the other end of the mandrel; the sliding table is capable of horizontally moving along the axial direction of the inner cylindrical surface of the bearing pedestals under the guide of a guide component; and the data acquisition / processing / calculation / display device is used for collecting and processing the angular speed signal, monitored by the rotating speed sensor, of the mandrel, and calculating the equivalent friction torque and equivalent friction coefficient of the tested rolling bearing. The measuring device has the capability of rapidly and precisely measuring the equivalent friction torque and equivalent friction coefficientof the rolling bearing.

The invention discloses a preparation method of an antibacterial fresh-keeping material, which comprises the following steps: preparing a base material, preparing a coating liquid 1, coating the front surface of the base material with the coating liquid 1, curing, soaking in a sodium hydroxide aqueous solution, taking out and drying, preparing a coating liquid 2, coating centrifugal paper with the coating liquid 2, and then inversely buckling the centrifugal paper on the back surface of the base material. Through pressing and drying, the front face and the back face of a coating material are subjected to ultraviolet irradiation, cutting, edge sealing and packaging treatment, broad-spectrum antibiosis is achieved, the antibiosis rate reaches 90% or above, the fresh food curing time can be effectively prolonged, the decay rate is reduced, and the method is especially suitable for fresh food transportation and preservation under the harsh conditions of high temperature, high humidity and the like, and the loss rate is reduced. For example, for juicy peaches, the curing and softening time can be prolonged by 2-5 days, and the deterioration and decay time can be prolonged by 6-10 days; the preparation process is simple and suitable for batch production, popularization and application.

The invention discloses a double-arc Chinese zither in the field of plucked instruments. The double-arc Chinese zither includes a hollow resonance body consisting of a face plate of upper part, a base plate of lower part, end plates at two ends and front and back side plates. Three ways of bass bars are vertically arranged in the resonance body with a certain spaced distance; a sound hole is arranged in the base plate; the face plate presents upward and raised arc transition from the front side plate to the back side plate and is provided with a Chinese zither horse, a plurality of strings are erected on the Chinese zither horse and fixed with the resonance body at two ends; the diameter of strings gradually thins from the front side plate to the back side plate; and the base plate also presents upward and raised arc transition from the front side plate to the back side plate. In fabrication, the base plate is formed by bending a flat plate, after the Chinese zither is made, the upper surface of the base plate is in a stretching and tension state, has stronger elasticity and can cause sound wave to be better reflected and resounded in the resonance body; acoustic energy attenuates slightly for long time; as the base plate can better coordinate with the face plate for resonance, the timbre of the Chinese zither becomes clearer and more far-reaching, mellower and more lingering. According to the technical proposal, a high-grade Chinese zither can be made.