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34 results about "Physical constant" patented technology

A physical constant, sometimes fundamental physical constant or universal constant, is a physical quantity that is generally believed to be both universal in nature and have constant value in time. It is contrasted with a mathematical constant, which has a fixed numerical value, but does not directly involve any physical measurement.

Method, apparatus and computer program product for forming data to be analyzed by finite element method and calculation method based on finite element method

A user uses part data forming means 101 and module data forming means 102 to input the actual dimension, physical constants and mesh dividing number for fundamental shapes which are registered in advance, thereby forming parts, and then indicates the relative position between the parts to form the entire shape of an assembly of plural parts without paying attention to coincidence or non-coincidence of nodal points. Data converting means 104 divides the shape of each part thus assembled according to the indicated mesh divisional number to generate element data and nodal point data. Further, it generates a constraint equation for connecting nodal points which are non-connected between neighboring parts, and forms an analysis model 401. A finite element method analyzer 105 uses approximate calculation means 106 to approximate a non-connected nodal point displacement from a nodal point displacement of neighboring structural elements on the basis of the constraint equation.
Owner:NEC CORP

Field effect transistor, organic thin-film transistor and manufacturing method of organic transistor

A method for determining the combination of the electrode and organic semiconductor with improved electron injection efficiency and hole injection efficiency in an organic TFT is provided, two types of FETS, that is, an n channel FET and a p channel FET are realized, and further, a complementary TFT (CTFT) is provided. The method for obtaining the vacuum level shift at the electrode metal / organic semiconductor interface from physical constants of constituent elements of the electrode and the organic semiconductor is provided. By changing the electrode metal through an electrochemical method, the electrodes whose electron injection and hole injection can be controlled are formed. By using these electrodes, two types of FETs such as an n channel FET and a p channel FET are realized, thereby providing a complementary TFT (CTFT).
Owner:HITACHI LTD

Preparation method and technology of alliin reference substance

The invention relates to a preparation method and technology of alliin reference substance, which comprises the following steps of: first extracting alliin from fresh garlic; then preparing the alliin reference substance by using two methods: the first method is to prepare the alliin reference substance by ethanol recrystallization; and the second method is to prepare the alliin reference substance by acetone recrystallization; and finally determining the alliin physical constant, analyzing four spectrum, and determining the purity; if all the indicators thereof are eligible, the product complies with the 'alliin reference substance' required by the 'plant extract reference substance' regulated by the State Food and Drug Administration.
Owner:新疆胡蒜研究院(有限公司)

Field effect transistor, organic thin-film transistor and manufacturing method of organic transistor

A method for determining the combination of the electrode and organic semiconductor with improved electron injection efficiency and hole injection efficiency in an organic TFT is provided, two types of FETs, that is, an n channel FET and a p channel FET are realized, and further, a complementary TFT (CTFT) is provided. The method for obtaining the vacuum level shift at the electrode metal / organic semiconductor interface from physical constants of constituent elements of the electrode and the organic semiconductor is provided. By changing the electrode metal through an electrochemical method, the electrodes whose electron injection and hole injection can be controlled are formed. By using these electrodes, two types of FETs such as an n channel FET and a p channel FET are realized, thereby providing a complementary TFT (CTFT).
Owner:HITACHI LTD

Physical constant temperature seat and manufacturing method thereof

The invention relates to a physical constant temperature seat, which is composed of a seat frame and a physical constant temperature chair cushion, the physical constant temperature chair cushion is assembled with the seat frame, and the physical constant temperature chair cushion includes a mask bag and a cushion layer, wherein: the cushion layer is composed of A constant temperature body, a heat insulation layer and a protective layer are formed. A heat insulation layer is arranged under the constant temperature body. The protective layer wraps and connects the heat insulation layer with the surroundings of the constant temperature body. The mask bag seals the cushion layer in the mask bag. The packaging bag of the constant temperature body is a closed bag of high-strength material that is breathable and leak-proof. It is divided into 4-13 strip bags by 3-12 partitions, and the strip bags are filled with energy storage materials. The energy storage material is composed of Glauber's salt, sodium bicarbonate, sodium bicarbonate, sodium carboxymethyl cellulose and distilled water. When the human body touches the constant temperature body, the energy storage material absorbs heat and undergoes a phase transition and melts. After leaving, it dissipates heat and returns to a solid state. The invention is safe to use, has no pollution, does not require additional energy, and is durable.
Owner:闵育秀 +1

Yi's 4-in-1 antique identification method

The present invention makes Yi's 4-in-1 antique identification method known to the public. It combines visual inspection, colorimetric method, microscopic observation and density comparison to one method. Among them the density comparison is to detect the object's unit weight, contrast the unit weight of object to determine the age. This invention combines the antique's inherent physical constant to confirm its age. The present invention may be used for the identification of porcelain, jade and bronze. The user then obtains more accurate results by using this easy, simple and cost-effective method.
Owner:INT ART & ANTIQUES RES ASSOC

Integrated Power Supply System Analysis System, Integrated Power Supply System Analysis Method, and Multilayer Printed Circuit Board

Information related to a structure of a multilayer printed circuit board, a physical constant and a mesh is input (Step S701) to generate an equivalent circuit model of the multilayer printed circuit board (Step S702). A transfer matrix is generated with an LSI power source terminal mounting candidate point of the uppermost layer as an input and an LSI power source terminal mounting candidate point of the lowermost layer as an output (Step S703) and the transfer matrix is converted into an impedance matrix (Step S704). Here, a first LSI mounting point is input (Step S705) to select an optimum LSI mounting point (Step S706) and the optimum LSI mounting point and the remaining LSI mounting candidate points are sequentially output (Step S707).
Owner:NEC CORP

Antineoplastic application of Hederagenin-3-O-arabinopyranoside

The invention relates to application of hederagenin-3-O-arabinopyranoside (hederagenin-3-O-arabinopyranoside). The Hederagenin-3-O-arabinopyranoside is obtained by utilizing a chemical extraction separation method. The chemical compound structure of the hederagenin-3-O-arabinopyranoside is identified by utilizing physical constants and spectroscopy methods to carry out an antineoplastic pharmacological testing for the hederagenin-3-O-arabinopyranoside, a result shows that the hederagenin-3-O-arabinopyranoside has good effect on antineoplastic aspects ,especially has good effects on restraining human breast cancer cells, sarcoma cells, gastric carcinoma cells, hepatoma carcinoma cells and prostate cancer cells. The hederagenin-3-O-arabinopyranoside can be used for preparing medicines for curing breast cancer, solid tumor, gastric cancer, liver cancer and prostate cancer.
Owner:YUNNAN INST OF MATERIA MEDICA

Physical constant temperature bed and its manufacturing method

The invention relates to a physical constant temperature bed, which is composed of a bed frame and a physical constant temperature mattress. The physical constant temperature mattress and the bed frame are assembled together. The physical constant temperature mattress includes a mask bag and a cushion, wherein: the cushion Body, heat insulation layer and protective layer, heat insulation layer is set under the constant temperature body, the protective layer wraps and connects the heat insulation layer and the surrounding of the constant temperature body together, and the mask bag seals the cushion layer in the mask bag. The packaging bag of the constant temperature body is a closed bag of high-strength material that is breathable and leak-proof. It is divided into 4-30 strip bags by 3-29 partitions, and the strip bags are filled with energy storage materials. The energy storage material is composed of Glauber's salt, baking soda, Yuanming powder, sodium carboxymethyl cellulose and distilled water. When the human body touches the constant temperature body, the energy storage material absorbs heat and undergoes a phase transition and melts. After leaving, it dissipates heat and returns to a solid state. The invention is safe to use, has no pollution, does not require additional energy, and is durable.
Owner:闵育秀 +1

Antique identification method

A 4-in-1 antique identification method combines visual inspection, a colorimetric method, microscopic observation, and a density comparison method to form conclusions as to the date of an antique object. Among them the density comparison is to detect the identified object's unit weight, and compare it to known data of historical unit weights of objects, to determine the age of the object being measured. This combines the antique's inherent physical constant to confirm its age. This is repeated for each step, to provide a number of estimated age results for the object. If the results are in agreement, the result can be considered reliable and the object can be deemed authentic. This method especially applies to the identification of porcelain, jade and bronze with less equipment and easier operation.
Owner:YI WEIQIAN

Four-in-one authentication method

The invention discloses a four-in-one authentication method. According to the invention, four methods which are visual observation, color matching, microscopic observation, and volume weight comparison are integrated into a whole antique authentication method. In the volume weight comparison step, the volume weight of the antique requiring authentication is measured, and is compared with the volume weight of a contrast sample, such that the age of the antique requiring authentication is determined. According to the invention, the age and authenticity of an antique is determined according to inherent physical constants of the antique. A traditional authentication method is combined with the color matching, microscopic observation, and volume weight comparison methods, such that influences on antique authentication caused by human factors can be reduced. According to the invention, a standardized antique authentication method with high operability is provided. The method employs less equipment, and is simple and feasible. The method can be used in authentications of chinaware, jade articles and bronze vessels.
Owner:马群法 +1

Physical constant temperature aircraft seat and manufacturing method thereof

The invention relates to a physically constant temperature aircraft seat, which is composed of an aircraft seat and a physical constant temperature seat pad, the physical constant temperature seat pad is assembled with the aircraft seat, and the physical constant temperature seat pad includes a mask bag and a cushion layer, wherein: the cushion layer It is composed of a constant temperature body, a heat insulation layer and a protective layer. A heat insulation layer is set under the constant temperature body. The protective layer wraps and connects the heat insulation layer with the surroundings of the constant temperature body. A zipper is provided on one side of the mask bag to seal the cushion layer. Inside the mask bag. The packaging bag of the constant temperature body is a closed bag of high-strength material that is breathable and leak-proof. It is divided into 4-13 strip bags by 3-12 partitions, and the strip bags are filled with energy storage materials. The energy storage material is composed of Glauber's salt, sodium bicarbonate, sodium bicarbonate, sodium carboxymethyl cellulose and distilled water. When the human body touches the constant temperature body, the energy storage material absorbs heat and melts in phase transition, and returns to a solid state by heat dissipation after leaving. The invention is safe to use, has no pollution, does not require additional energy, and is durable.
Owner:闵育秀 +1

Nutrition solution physical constant temperature energy saving system

The embodiment of the invention provides a nutrition solution physical constant temperature energy saving system. The nutrition solution physical constant temperature energy saving system comprising asemiconductor board and a power controller module is characterized in that the semiconductor board is connected with the power controller module; the semiconductor board is in contact with a box bodyof a thermostat; the power controller module is used for inputting currents to the semiconductor board and controlling the flow of the currents in the semiconductor board according to the demand of temperature adjustment; the semiconductor board is used for absorbing or releasing heat according to the input currents from different flow directions so as to adjust the temperature of the nutrient solution in the box body. The nutrition solution physical constant temperature energy saving system has the advantages of being capable of adjusting the temperature of the nutrient solution by the heatabsorption or heat release of the semiconductor board and accurately controlling the heat absorption or heat release by using the Peltier effect so as to accurately control the temperature of the nutrient solution, and being energy-saving compared to the prior art and improving economic efficiency with the nutrient solution not affected due to the fact that current and voltage required for the semiconductor board to work are small.
Owner:BEIJING RES CENT OF INTELLIGENT EQUIP FOR AGRI

Method for building energetic material mesoscopic hot spot physical model

The invention belongs to the technical field of energetic material thermo-safety and relates to a method for building an energetic material mesoscopic hot spot physical model. The method comprises thermal decomposition mechanism function and parameter determination, energetic material microstructure surface morphology evolution rule research, energetic material microstructure inner morphology evolution rule research and energetic material ingredient thermal physical constant determination. The method fully considers characteristics of energetic material self-damage, provides convenience and versatility for selection of interface model parameters of energetic material microscopic damage numerical simulation, builds a physical simulation rule system and a mesoscopic hot physical model satisfying the rule through complete simulation and prediction of practical characteristics and processes, has complete functions and can be implemented easily.
Owner:PLA SECOND ARTILLERY ENGINEERING UNIVERSITY

Light velocity measuring method based on LC oscillation circuit

InactiveCN106949979AReduce complexityReduce error rateLight velocity measurementCapacitanceInductance
The invention belongs to the technical field of physical constant measurement, and particularly relates to a novel light velocity measuring method based on an LC oscillation circuit. The method comprises the following steps: acquiring LC oscillation period T, inductance L, and capacitance C; linearly fitting the square value of the oscillation period (T<2>) and the inductance parameter (N<2> / 1) according to the sampling values of the oscillation period and the inductance parameter to get the linear slope k; and calculating the value of epsilon0*Mu0, and calculating the velocity of light c. By measuring the velocity of light based on an LC oscillation circuit, the complexity of light velocity measurement is reduced, the accuracy of measurement is increased, and the error rate is reduced.
Owner:BEIJING UNIV OF CIVIL ENG & ARCHITECTURE

Physical constant temperature sofa and manufacturing method thereof

The invention relates to a physical constant temperature sofa, which is composed of a sofa seat and a physical constant temperature sofa cushion. The physical constant temperature sofa cushion is assembled with the sofa seat. The physical constant temperature sofa cushion includes a mask bag and a cushion layer, wherein: the cushion layer is composed of a constant temperature body, The thermal insulation layer and the protective layer are formed, and the thermal insulation layer is arranged under the constant temperature body, and the protective layer wraps and connects the thermal insulation layer with the surrounding of the constant temperature body, and the mask bag seals the cushion layer in the mask bag. The packaging bag of the constant temperature body is a closed bag of high-strength material that is breathable and leak-proof. It is divided into 4-16 strip bags by 3-15 partitions, and the strip bags are filled with energy storage materials. The energy storage material is composed of Glauber's salt, sodium bicarbonate, sodium bicarbonate, sodium carboxymethyl cellulose and distilled water. When the human body touches the constant temperature body, the energy storage material absorbs heat and melts in phase transition, and returns to a solid state by heat dissipation after leaving. The invention is safe to use, has no pollution, does not require additional energy, and is durable.
Owner:闵育秀 +1

Method for measuring light physical constants and device for estimating light physical constants

A method for measuring light physical constants includes a dividing step (S106) of setting a plurality of first segments by dividing, virtually, an optical transmission medium along the direction of propagation, and a first estimating step (S108 - S114) of estimating the light physical constants for the plurality of first segments on the basis of a first propagation simulation result by way of a model for which input optical signals having various intensities are propagated in order in the plurality of first segments. For the first estimating step, the light physical constants for the plurality of first segments are estimated by performing a search for the light physical constants for the plurality of first segments using an evaluation function that evaluates the difference between a power spectrum of a measured output optical signal and a power spectrum of an output optical signal obtained as the result of the first propagation simulation result.
Owner:OSAKA UNIV

Improved device for measuring air specific heat ratio through adopting vibration method

An improved device for measuring air specific heat ratio through adopting the vibration method relates to measurement of physical constants and aims to overcome problems existing in the conventional technology. The technical scheme is as follows: the improved device for measuring air specific heat ratio through adopting the vibration method comprises a glass tube and a vibration object, wherein the distance between the surface of the vibration object and the glass tube in the corresponding position can reach to 0.01-0.02 mm; small holes are formed in the side surface of the glass tube; the device is characterized in that the vibration object is improved from a steel ball to a cylinder; two or more protruding edges are symmetrically distributed on the side surface of the cylinder; all axes of the protruding edges are parallel to the central axis of the cylinder; grooves are formed in the glass tube; the number of the grooves is consistent with that of the protruding edges on the side surface of the cylinder; the cylinder can only be embedded into the glass tube grooves to slide upwards and downwards through the protruding edges; multiple circles and rows of the small holes are formed. The improved device has the benefits that the cylinder is prevented from rotating in the vertical direction; the protruding edges of the cylinder are matched with the grooves of the glass tube, so that rotation of the cylinder in the horizontal plane is avoided; owing to a larger gap between the cylinder and the glass tube, the flow manner of air is more close to laminar flow, so that collision between the steel ball and the wall of the glass tube is reduced.
Owner:SICHUAN UNIV

Production method of constant-temperature oil preparation by using camellia oleifera seeds and refining purification

The invention discloses a production method of constant-temperature oil preparation by using camellia oleifera seeds and refining purification. Physical constant-temperature press is carried out by using a double-screw oil press, and the oil preparation method is carried out by directly pressing oil materials without the process of steaming, stir-frying and the like; oil prepared by low-temperature pressing retains most of physiologically active substances in camellia oleifera seeds; high-temperature pressing is needed in a conventional pressing technology, and materials need to be heated fromroom temperature to 110-120 DEG C; according to the invention, a green constant-temperature oil preparing and processing technology is adopted, materials only need to be heated to 60 DEGC, and the steam consumption of the conventional technology is three times of the steam consumption of the technology provided by the invention according to calculation; steam is used only at a dry place with a low temperature in the green constant-temperature oil preparing and processing technology, and indirect steam is used, so that the oil preparing equipment is superior to the oil preparing equipment of the conventional pressing technology in all aspects such as service life and the like; the economic benefits such as energy conservation, environment friendliness and the like are very significant, thecamellia oleifera seed oil has better edible value and utilizing and developing values; the constant-temperature oil preparation and refining purification processing technologies are adopted, so thatthe obtained camellia oleifera seed oil has the advantages of light color, stable oil quality, original color and original taste, and retains the original characteristics of camellia oleifera seed oil. The method provided by the invention mainly avoids the defects of dark color and poor quality of camellia oleifera seed oil caused by high temperature in the processing process.
Owner:HUNAN QIJIA OIL

Novel method for drought evaluation of automatic soil moisture observation station

The invention discloses a novel method for drought evaluation of an automatic soil moisture observation station, relating to the technical field of soil drought evaluation. The method is mainly characterized in that two soil moisture physical constants such as soil field water-holding capacity and wilting moisture are adopted, and the relative soil wilting moisture of multiple soil moisture observation stations is calculated; the relative soil wilting moisture is taken as the lower limit of three types of soil moisture content, the relative humidity of 100 percent is taken as the upper limit of a type of soil moisture content, and the novel evaluation standard of the soil moisture content grades of the types I, II and III can be determined by using (the relative humidity 100 percent of the field water-holding capacity-the relative soil wilting moisture) / 3 equal interval division. According to the method disclosed by the invention, the regional agriculture drought grade standard is determined in drought evaluation of the regional soil moisture automatic station, and the standard is more accurate than the general standard. On the basis of the general standard, the single-station single-standard drought grade evaluation mode is realized.
Owner:代海燕

Method for measuring air specific heat ratio through the adoption of vibration method

The invention provides a method for measuring air specific heat ratio through the adoption of the vibration method, relates to measurement of physical constant and overcomes problems existing in the conventional technology. The technical scheme adopted by the method is as follows: a cylinder with a sealed upper end and an opened lower end is provided, wherein a spirit bubble is arranged in the plane surface on the outer side of the upper end surface; one or more air holes are formed in the upper part on the side surface of the cylinder and can be sealed through sealing nuts; the cylinder is vertically fixed on a support; a spring is connected between the plane surface at the upper end on the inner side of the cylinder and a piston; the upper end of a suspension line is fixed to the center of the lower end face of the piston; a heavy object is tied to the lower end of the suspension line; when the air holes are open, the vibration period T1 of the heavy object equals to 2Pi(m / k)<0.5>; when all the air holes are sealed, the vibration period of the heavy object is T and the air specific heat ratio gamma equals to 4Pimh(T1<2> minus T<2>) / (r<2>PT<2>T1<2>), wherein Pi is the ratio of the circumference of a circle to its diameter, m is the quality sum of the piston and the heavy object, k is the elastic coefficient of the spring, P is the pressure of the sealed air and r is the inner diameter of the cylinder. The method has the benefits that the sealed air is elastic, the experiment principle is stricter, strict simple harmonic vibration is realized, rotation is avoided and the device is simpler in structure and lower in cost.
Owner:SICHUAN UNIV

A Method of Measuring Air Specific Heat Capacity Ratio by Vibration Method

The invention provides a method for measuring air specific heat ratio through the adoption of the vibration method, relates to measurement of physical constant and overcomes problems existing in the conventional technology. The technical scheme adopted by the method is as follows: a cylinder with a sealed upper end and an opened lower end is provided, wherein a spirit bubble is arranged in the plane surface on the outer side of the upper end surface; one or more air holes are formed in the upper part on the side surface of the cylinder and can be sealed through sealing nuts; the cylinder is vertically fixed on a support; a spring is connected between the plane surface at the upper end on the inner side of the cylinder and a piston; the upper end of a suspension line is fixed to the center of the lower end face of the piston; a heavy object is tied to the lower end of the suspension line; when the air holes are open, the vibration period T1 of the heavy object equals to 2Pi(m / k)<0.5>; when all the air holes are sealed, the vibration period of the heavy object is T and the air specific heat ratio gamma equals to 4Pimh(T1<2> minus T<2>) / (r<2>PT<2>T1<2>), wherein Pi is the ratio of the circumference of a circle to its diameter, m is the quality sum of the piston and the heavy object, k is the elastic coefficient of the spring, P is the pressure of the sealed air and r is the inner diameter of the cylinder. The method has the benefits that the sealed air is elastic, the experiment principle is stricter, strict simple harmonic vibration is realized, rotation is avoided and the device is simpler in structure and lower in cost.
Owner:SICHUAN UNIV

Physical constant temperature ship seat and manufacturing method thereof

The invention relates to a physically constant temperature ship seat, which is composed of a ship seat bracket and a physical constant temperature chair pad. The physical constant temperature chair pad and the ship seat bracket are assembled together. The physical constant temperature chair pad includes a mask bag and a cushion layer, wherein: The cushion layer is composed of a constant temperature body, a heat insulation layer and a protective layer. The heat insulation layer is set under the constant temperature body. Closed inside mask bag. The packaging bag of the constant temperature body is a closed bag of high-strength material that is breathable and leak-proof. It is divided into 4-13 strip bags by 3-12 partitions, and the strip bags are filled with energy storage materials. The energy storage material is composed of Glauber's salt, sodium bicarbonate, sodium bicarbonate, sodium carboxymethyl cellulose and distilled water. When the human body touches the constant temperature body, the energy storage material absorbs heat and melts in phase transition, and returns to a solid state by heat dissipation after leaving. The invention is safe to use, has no pollution, does not require additional energy, and is durable.
Owner:闵育秀 +1

Physical constant temperature train seat and manufacturing method thereof

The invention relates to a physically constant temperature train seat, which is composed of a train seat bracket and a physical constant temperature chair cushion, the physical constant temperature chair cushion is assembled with the train seat bracket, and the physical constant temperature chair cushion includes a mask bag and a cushion layer, wherein: The cushion layer is composed of a constant temperature body, a heat insulation layer and a protective layer. A heat insulation layer is set under the constant temperature body. Closed inside mask bag. The packaging bag of the constant temperature body is a closed bag of high-strength material that is breathable and leak-proof. It is divided into 4-13 strip bags by 3-12 partitions, and the strip bags are filled with energy storage materials. The energy storage material is composed of Glauber's salt, sodium bicarbonate, sodium bicarbonate, sodium carboxymethyl cellulose and distilled water. When the human body touches the constant temperature body, the energy storage material absorbs heat and undergoes a phase transition and melts. After leaving, it dissipates heat and returns to a solid state. The invention is safe to use, has no pollution, does not require additional energy, and is durable.
Owner:闵育秀 +1

Turntable double-beam transmission device based on fiber coupler and optical filter

The invention discloses a turntable double-beam transmission device based on a fiber coupler and an optical filter, and relates to the field of precision measurement and inertial navigation. The device is placed on an optical platform. A light source, a beam combining module and a first reflector are arranged successively. A turntable is fixed to the optical platform by the legs thereof. The firstreflector is fixed to the optical platform and located at an intermediate position below the bottom surface of the turntable. A second reflector is fixed at an intermediate position above the table top of the turntable. The second reflector and a beam splitting module are arranged one front and back. The beam splitting module is placed above the table top of the turntable. First and second optical filters are Fabry-perot interferometers. The device is simple in structure, high in stability and easy to manufacture, and can be applied to the high-precision detection of a laser gyro, the inertial measurement of a laser interferometer and an atomic interferometer, the measurement of basic physical constants and the high-precision verification of special relativity.
Owner:WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI

Improved device for measuring air specific heat ratio through vibration method

The invention discloses an improved device for measuring an air specific heat ratio through a vibration method, and relates to measurement of a physical constant. In order to solve problems of the prior art, an adopted technical scheme is as follows: the improved device for measuring the air specific heat ratio through the vibration method comprises a glass tube and a steel ball, wherein the steel ball is close to the surface of the glass tube and keeps a distance of 0.01-0.02mm with the glass tube on a corresponding position; a small hole is formed on the side face of the glass tube; the improved device is characterized in that two or more cylinders are symmetrically distributed on the steel ball, wherein axes of all cylinders are mutually parallel; one side of each cylinder is closely contacted with the steel ball and is embedded in the steel ball while the other side is protruded out of spherical surface of the steel ball; grooves are formed on the glass tube, and the number of the grooves is identical to the number of the cylinders on the spherical surface of the steel ball; and the cylinders on the spherical surface of the steel ball can slide up and down along the grooves of the glass tube. Multiple rings and multiple rows of small holes are formed, namely 10-500 small holes. The improved device disclosed by the invention has the beneficial effects that the steel ball is effectively prevented from rotating; and flowing air is nearly in laminar flow, thus relieving collision between the steel ball and the wall of the steel tube.
Owner:SICHUAN UNIV

A Modeling Method of Electromagnetic Rail Launcher

The invention relates to a modeling method of an electromagnetic track launcher: simultaneously realizing the matching of the physical field and the armature velocity in the prototype and the model. Then the similarity constants of each physical quantity need to satisfy: (1) the geometric similarity constant is k; (2) the electromagnetic correlation similarity constant: the similarity constant of the current density is 1 / k, and the similarity constant of the electrical conductivity is 1 / k, and the magnetic permeability (3) The similarity constant of thermal correlation: the similarity constant of thermal conductivity is k, the similarity constant of heat capacity per unit volume is 1; (4) The similarity constant of time and kinematics: the similarity constant of time is k, and the similarity constant of density and velocity The constant is 1. The present invention realizes the matching with the analysis result of the kinematic equation; it can realize the similarity of the electric field; it can realize the matching of the physical field and the armature velocity at the same time, and can effectively simulate the physical phenomenon related to the velocity; the required materials are simple and easier to realize; Ensure the similarity of the model and prototype emitter temperature fields.
Owner:BEIJING INST OF TECH SPECIAL ELECTROMECHANICAL
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