33results about How to "Good repeat test" patented technology

The invention discloses a reverse-flow type rapid extraction device for sediment organic matter and belongs to the field of environmental studies. The device comprises a sample treatment system (two round-bottom flasks containing a sediment sample and an organic extraction solvent respectively), a reverse-flow collecting system and a condensation reverse-flow system. The sediment sample, an ultrapure water mixture and the organic extraction solvent in the round-bottom flasks are heated respectively, the organic extraction solvent and target objects ascend to a condenser pipe at the upper end from a glass reverse-flow pipe in a gas state and a flow guiding mode, the organic extraction solvent extracts the target organic contaminants in a gas phase state, the target organic contaminants are condensed under the action of circulating cooling water and fall back into the reverse-flow collecting system, and due to the density difference between the organic extraction solvent and a water phase, an effective laying is obtained. The water phase and the organic phase return into the round-bottom flasks through return-flow catheters with different oblique angles, over and over again, the target organic contaminants are constantly extracted through the pure solvent, and the target organic contaminant is collected in the reverse-flow system. After extraction is completed, the organic phase containing the target objects is discharged through a liquid separating switch, components are collected, and therefore the target organic contaminants in the sediment sample are effectively extracted.

The invention belongs to the technical field of a mathematics teaching aid and particularly relates to a probability theory experiment model teaching aid. The teaching aid comprises a casing, a support, a disposing groove, a buffer hole, an ejection groove and an ejection module, wherein the ejection module comprises a first limit unit, a second limit unit, a guide column, a fixing block and a spring, the first limit unit and the second limit unit have the same structures and are symmetric to each other, the first limit unit comprises a pressing column, a swing plate and a rope, one end of thepressing column is hinged with one end of the swing plate, the pressing column moves to push the swing plate to rotate around a rotation shaft, one side of an upper end of the swing plate is providedwith two half-circle projections, one side of a lower end of the swing plate is fixedly connected with the rope, the rope is fixedly connected with a lower end of the guide column after passing through a guide roller, an upper end of the guide column is fixedly connected with a bottom portion of the spring, and the spring is arranged between the two swing plates. The probability theory experimentmodel teaching aid is advantaged in that through setting the ejection module, a batch of coins are ejected, continuous ejection of the coins can be achieved, and experiment efficiency is improved.

The invention discloses a model test device and method for studying a landslide surge propagation rule and a climbing effect. The model test device comprises a conveying device, a landslide mass model, an experimental water tank, a waveform test device, a climbing effect slope shape device and the like. The conveying device comprises a conveying belt, a lifting bearing platform, an engine and the like. The landslide mass model slides into the experimental water tank through the conveying belt; the water tank is fixed above the water tank bearing platform; the waveform test device comprises a high-speed image recorder and a wave measurer which are respectively arranged on the side surface and the bottom of the experimental water tank, and a terminal is connected with the receiving device; the climbing effect slope shape device is fixed in the experimental water tank during a climbing effect experiment; and the pressure sensing device is placed on the surface of the slope shape device. According to the invention, the propagation law of surges in different propagation directions in a horizontal tank and the propagation law of surges in an inclined water tank caused by one-time or continuous multi-time sliding of landslide bodies with different states, different sliding speeds and different water entry angles can be simulated through the test device.

The invention discloses a device for generating specific local geometric initial defects on the outer surface of a thin shell structure, and belongs to the technical field of structural engineering. The device comprises a fixed magnet, a telescopic rod, a fixed rod, a connecting rod, a sliding rod, an external load and a fixed pulley; a long hole is formed in the fixed rod; the fixed magnet is fixed at the top of the side wall of the fixed rod through the telescopic rod and is used for adsorbing the whole device on a testing machine; the connecting rod is fixed with the long hole of the fixed rod through a bolt; a sliding block on the sliding rod is matched with a sliding groove in the connecting rod, so that the sliding rod moves in the axial direction; and the external load is wound around the fixed pulley through a tether to be connected with a fixing plate, the weight of the external load is converted into axial thrust to the sliding rod through the fixed pulley and the tether, and along with movement of the sliding rod in the length direction of the sliding groove, a pressing head achieves fixed-point loading on the surface of the thin shell, so that a needed pit is formed. According to the device, the pit defects with variable positions, angles and depths can be quantitatively generated, and the device is used for quantitatively evaluating the influence of initial defect parameters on the structural bearing capacity.

The invention belongs to the technical field of mathematics teaching, and particularly to a probability theory model teaching optimization method. The method is characterized in that coin throwing equipment is utilized; the coin throwing equipment comprises a housing, a bracket, a placing trough, a buffering hole, an ejection trough and an ejection module; the ejection module comprises a first spacing unit, a second spacing unit, a guiding column, a fixed block and an elastic plate; the first spacing unit and the second spacing unit have the same structure and are symmetrically arranged; the first spacing unit comprises a pressing column, a swinging board and a pulling rope; one end of the pressing column is hinged with one end of the swinging board; the pressing column moves and is used for pushing the swinging board rotate around a rotating shaft; one side of the upper end of the swinging board is provided with two semicircular projections; one side of the lower end of the swinging board is fixedly connected with the pulling rope; the pulling rope bypasses a guiding roller and is fixedly connected with the lower end of the guiding column; the upper end of the guiding column is fixedly connected with bottom of the elastic plate; and the elastic plate is arranged between the two swinging boards. According to the probability theory model teaching optimization method, through arranging the ejection module, a batch of coins are ejected, and continuous ejection of the coins can be realized, thereby improving experiment efficiency.

The invention discloses a memory alloy driven satellite-bone locking and releasing device. The memory alloy driven satellite-bone locking and releasing device comprises a segmented nut, a pressure-bearing steel ball, a retainer, a first compression spring, a clamping spring, a shell, an upper cover and a separation rod; after the diameter of the clamping spring is increased, the clamping spring slides off along a lug boss of the retainer; the retainer is jacked upwards under the action of the first compression spring, so as to drive the pressure-bearing steel ball to move upwards along a first rolling groove until the pressure-bearing steel ball falls into a second rolling groove; the segmented nut is released from limitation and then is expanded outward; a second compression spring drives the separation rod to be downward popped up. The memory alloy driven satellite-bone locking and releasing device has the advantages of small size, light weight, strong bearing capability, small released impact, high reliability, simplicity in secondary assembling, capability of being repeatedly utilized and the like, and has wide applicability and popularization and application values.

The invention discloses dynamic impact loading test bed and a test system thereof. The dynamic impact loading test bed comprises an impact unit, a lifting unit and a test piece plummer, wherein the impact unit is carried on a fixed rack and is connected with a tension spring unit; and the tension spring unit can exert an elastic restoring force on the impact unit. The dynamic impact loading test system comprises the dynamic impact loading test bed and tests the mechanical property of a test piece to be tested by connecting with a computer. The dynamic impact loading test bed and the system exert extra downward elastic restoring force on the impact unit by the tension spring unit, can still obtain higher impact loading speed under the precondition of realizing device miniaturization and has the functions and advantages of high energy conversion rate, little noise pollution, stable emission, easy speed regulation, convenient test repetition, and the like.

The invention relates to a method for quickly analyzing chemical components in bauxite by X-ray fluorescent spectrometry. The method comprises the following steps of preparing the bauxite into a platy sample suitable for fluorescence spectrum analysis; carrying out a provocative test on the platy sample of the bauxite, and determining measurement parameters of an X-ray fluorescence spectrometer adaptable to the analysis of the bauxite; carrying out multiple provocative tests on a platy sample of a standard substance according to the set measurement parameters, and determining a measurement mode and a deducting background position of an element according to the content and the characteristic spectral line intensity of each element in the bauxite; determining a linear relation between the content and the characteristic spectral line intensity of the element according to a measurement condition of the bauxite, and drawing out an analytical sensitivity curve of the bauxite; measuring the content of the sample of to-be-measured bauxite by utilizing the sensitivity curve. According to the method for quickly analyzing the chemical components in the bauxite by the X-ray fluorescent spectrometry, the accurate measurement can be carried out on an oxide in the bauxite by only using several minutes; thus, the quality of a material is controlled; the inspection efficiency of the material in production is improved; an analytical period is shortened; the method for quickly analyzing the chemical components in the bauxite by the X-ray fluorescent spectrometry is more suitable for the production requirement of a modern enterprise.

The invention relates to a system and a method for performing impact loading on a micro test piece and measuring dynamic mechanical property. The method comprises the following steps of: instantly accelerating a bullet by using an electromagnetic pulse launch technology and launching the bullet at high speed; transmitting a stretching stress wave generated by collision of the bullet to the micro test piece by using a separated Hopkinson bar technology so as to generate the impact loading on the micro test piece; recording strain data of an input bar and an output bar, and acquiring an enlarged surface dynamic deformation image of the micro test piece; analyzing and obtaining a stress strain curve of the micro test piece subjected to the impact loading having different strain rates; and analyzing the surface dynamic deformation image of the micro test piece and obtaining a distribution of a bidimensional displacement field and a strain field during dynamic impact loading of the micro test piece. By the system and the method, the problem of research on the dynamic mechanical property of a micro electro mechanical system (MEMS), and membrane materials such as piezoelectric thin films, ferroelectric thin films and the like is solved.

An intelligent type weighing sensor overload protection debugging system and a debugging method thereof belong to the weighing sensor debug technical field, and mainly relate to the sensor debugging system. In a weighing sensor overload protection debugging process in the prior art, counterweight artificially loading and data artificially recording are employed, thus affecting the testing accuracy, and resulting in low work efficiency and low debugging accuracy; the intelligent type weighing sensor overload protection debugging system and method can solve said problems; the debugging system comprises the following units: a test stand assembly used for carrying out automatic loading and unloading tests of a to-be-tested sensor; an AED host recording force bearing sensitivity of the to-be-tested sensor; a testing PC machine used for controlling to load and unload counterweights, and using a testing system to determine the obtained sensitivity data; a special server used for providing real time data exchange storage for the detection data. The debugging system and method are convenient to repeat tests, simple in an operation process, high in testing precision and testing efficiency, and have wide application prospects.

The invention discloses an abrasion testing machine for measuring the abrasion resistance index of rock and a using method of the abrasion testing machine. The abrasion testing machine comprises a plurality of parts, and a supporting frame assembly builds a load-carrying framework of the abrasion testing machine; the load steel needle assembly is used for clamping a steel needle, adjusting the vertical position of the steel needle and providing load pressure after the steel needle is in contact with the rock sample; the rock sample clamping component is used for clamping and fixing a rock sample; the manual sliding table component is used for adjusting the left-right position of the rock sample; and the motor sliding table component is used for adjusting the front-back position of the rock sample and realizing the etching of the steel needle on the rock sample. The use method of the abrasion testing machine comprises the steps of installing the rock sample and the steel needle, adjusting the position of the rock sample, applying force to the rock sample, abrading the surface of the rock sample, taking down the rock sample and the steel needle, reading the abrasion resistance index and the like. According to the invention, the test of the wear resistance index of the rock is realized, and the device and the method are necessary equipment and a method for detecting the physical and mechanical properties of the rock, are used for evaluating the wear resistance of the rock and provide important reference for selection and wear of a rock breaking cutter in a construction process.

The invention discloses a test device and a modeling method for obtaining the normal contact stiffness of a joint surface. The device includes a lower test piece placement platform, the lower test piece placement platform is set on the base, and a lower small is arranged on the top of the lower test piece placement platform. The upper large inverted conical depression; the top of the platform where the lower specimen is placed is provided with a first annular protrusion, and the center of the first annular protrusion coincides with the center of the inverted conical depression; the lower specimen is placed in the inverted conical depression, and the lower specimen One side of the spherical surface faces upward and is higher than the first annular protrusion, and the top of the lower test piece is in contact with the bottom of the upper test piece; the bottom of the upper test piece is provided with a second annular protrusion matching the first annular protrusion; the upper test piece A three-way force sensor is fixed on the piece, and the three-way force sensor is connected with the hexagon socket head screw; one end of the screw rod is connected with the socket head cap screw, and the other end passes through the beam of the test platform. The device has a simple structure, is convenient to assemble and disassemble, and is easy to repeat the test, and solves the problem that the normal contact stiffness of the joint surface is difficult to test and accurately model.

The invention relates to a multifunctional pile foundation model testing system and an assembling and testing method thereof. The multifunctional pile foundation model testing system comprises a base, guide rails, a model frame, a loading system, a measuring system, a collecting device and a prefabricated pile body. The loading system comprises a loading device and a reaction frame and can achieve automatic control and set the load and the loading time autonomously. The measuring system is composed of different kinds of measuring equipment including an earth pressure cell, a sensor and a strain gauge. The collecting device can achieve automatic collecting and is connected with a digital display system. The digital display system comprises software which can provide data tables and has an automatic curve drawing function. The testing system is easy to operate, rich in function and capable of researching bearing characteristics of single piles and pile groups under different conditions, in different bearing stratums and of different types. Obtained results are more accurate, settlement data can be effectively measured, the process that the bearing characteristics of a pile foundation are achieved can be successfully simulated in the actual process, and effective reference bases are provided for guidance of pile foundation design and pile foundation bearing characteristic theory research.

The invention aims at providing a method for quickly semi-quantifying GH4169 alloy trace elements. The method comprises the following steps of: semi-quantifying the GH4169 alloy trace elements by adopting fluorescent spectrometry, and working out 1% net strength value of the GH4169 alloy trace elements; figuring out a critical strength value when the contents of the trace elements are respectively equal to 0.005% according to the 1% net strength value of the trace elements; comparing the measured strength of a test sample with the critical characteristic spectral line strength of the test sample to directly judge whether the test sample satisfies the requirements or not; or drawing a single-scale sensitivity curve by utilizing a proportional relationship between the element contents and the characteristic spectral line strength, so that the contents of three trace elements in the test sample are quickly semi-quantified. The method for quickly semi-quantifying GH4169 alloy trace elements does not need chemical pre-treatment and causes no damages to the surface of the test sample, can be used for conveniently testing the test sample again and again, is capable of greatly improving the material inspection efficiency in the production and shortening the analysis period and can well meet the modern generation requirements. Moreover, the method can be expanded to semi-qualifying analysis of trace elements in other high-temperature alloys.

The invention discloses an ABO 3 type double perovskite LaCo y Ni 1‑y o 3 The nanorod electrocatalytic material and its preparation method belong to the technical field of electrocatalytic materials. The electrocatalytic material of the present invention is prepared by taking hydrated cobalt nitrate, hydrated lanthanum nitrate, hydrated nickel formate and potassium hydroxide as raw materials through coprecipitation, hydrothermal, roasting and pickling processes. The prepared LaCo y Ni 1‑y o 3 Due to their special nanostructure, nanorods can release more electrochemically active sites and exhibit better electrocatalytic activity. At the same time, by adjusting the metal ratio of the catalytic center on the B site, the LaCo y Ni 1‑y o 3 Optimization of nanorod catalytic activity. ABO of the present invention 3 type double perovskite LaCo y Ni 1‑y o 3 The raw material price of nanorods is moderate, the preparation is simple, the performance is excellent, and it has good commercialization prospects. It is an excellent electrocatalytic material and can be used in new energy conversion fields such as electrocatalytic nitrogen reduction to produce ammonia.

The invention belongs to the technical field of a mathematics teaching aid and particularly relates to a probability theory experiment model teaching aid. The teaching aid comprises a casing, a support, a disposing groove, a buffer hole, an ejection groove and an ejection module, wherein the ejection module comprises a first limit unit, a second limit unit, a guide column, a fixing block and a spring, the first limit unit and the second limit unit have the same structures and are symmetric to each other, the first limit unit comprises a pressing column, a swing plate and a rope, one end of thepressing column is hinged with one end of the swing plate, the pressing column moves to push the swing plate to rotate around a rotation shaft, one side of an upper end of the swing plate is providedwith two half-circle projections, one side of a lower end of the swing plate is fixedly connected with the rope, the rope is fixedly connected with a lower end of the guide column after passing through a guide roller, an upper end of the guide column is fixedly connected with a bottom portion of the spring, and the spring is arranged between the two swing plates. The probability theory experimentmodel teaching aid is advantaged in that through setting the ejection module, a batch of coins are ejected, continuous ejection of the coins can be achieved, and experiment efficiency is improved.

The invention discloses a nitrogen-doped micro-mesoporous carbon / transition metal oxide composite material and a preparation method thereof, belonging to the technical field of new energy storage materials. The composite material of the invention is obtained by in-situ high-temperature pyrolysis growth of ultra-small transition metal oxide nanoparticles in a three-dimensional network structure of nitrogen-doped micro-mesoporous carbon by using various transition metal oxide salts as precursors. The nitrogen-doped micro-mesoporous carbon / transition metal oxide composite material prepared by the present invention fully utilizes the size advantage of nitrogen-doped micro-mesoporous carbon, so that the prepared composite material has a higher specific surface area and a more complex The microscopic pore structure provides paths and spaces for the transport and storage of electrolyte ions. At the same time, the successful loading of ultra-small transition metal oxide nanoparticles brings the possibility of efficient adsorption of electrolyte ions, which in turn greatly improves the electrochemical energy storage performance.

The invention discloses a digital drilling equipment and method for measuring rock mass strength on the engineering site, which consists of three parts: a digital drilling device, an adjusting frame and a mobile platform. The digital drilling device includes a drill bit, precision digital sensors, motors and protective devices, etc., which can abstract the drilling process into data information; The relative position of the rock mass is measured, and the adjustment frame is set on the mobile platform through the column, which can realize the drilling test of the measuring points at different positions; The characteristic parameters of the drilling tool response information in the drilling process, and the rock mass strength are obtained through mathematical operations; the invention realizes the quantitative, real-time and in-situ testing of the engineering rock mass strength, overcomes a large number of human subjective factors and sampling and sample preparation processes, and evaluates the results It is more rapid and accurate, and the equipment has a high degree of informationization and automation, and can be widely used and promoted in engineering.

The invention relates to the technical field of information storage, and more specifically, to a method for preparing a low activation voltage resistive switch device. The main steps are: 1) cleaning and pre-treating the surface of the conductive substrate for use; 2) subsequently growing on the conductive substrate and heat-treating to obtain the dielectric layer S1; 3) preparing the precursor solution A2 of the dielectric layer S2 , and add etchant to obtain the mixed precursor solution A3; 4) spin-coat the mixed precursor solution A3 on the dielectric layer S1 and heat-treat to obtain the composite dielectric layer S2(1) / S1; 5) in the composite dielectric layer S2(1) / S1 The top electrode is vapor-deposited on S1 to complete the preparation. The invention is easy to implement, has good repeatability and low cost, and can prepare a resistive variable device with low activation voltage under relatively low temperature and normal pressure conditions. This invention provides a new approach for the design and performance optimization of new semiconductor memory devices, and has important prospects in the electrical modification and directional regulation of semiconductor materials.

The invention discloses a test apparatus, a test method and a prediction method of bolting junction tangential dynamic characteristics. The test apparatus comprises a force tensile testing machine, an upper test piece, a lower test piece, bolts, strain gauges, a bridge, a dynamic strain indicator, a signal acquisition system and a computer. The upper test piece is fixed with an upper clamp of the force tensile testing machine, and the lower test piece is fixed with a lower clamp of the force tensile testing machine. The upper test piece and the lower test piece are fixed through the bolts. Each strain gauge is implanted at the centers of a screw axis of each bolt, and is connected with the bridge. The bridge is connected with the signal acquisition system through the dynamic strain indicator. Force and displacement of the force tensile testing machine are respectively sent to the signal acquisition system through a force sensor and a displacement sensor. The signal acquisition system is connected with the computer for transmitting the acquired bolt pre-tightening force and the data of the force and the displacement of the force tensile testing machine to the computer. The test apparatus is simple in structure, convenient for loading and unloading and easy to conduct repeated tests, and solves a problem that the retardation non-linear characteristic of the bolting junction is difficult to test.

The invention relates to a fuse-plug dam section test method using an overflow water tank synchronous stacking narrow groove and pipe, and belongs to the technical field of hydraulic prototype tests and model tests. The method involves an overflow water tank synchronous stacking open narrow groove comprising a synchronous stacking narrow groove, a support frame, a water return groove (3), an overflow high-level water tank, a water return well (5) and a test section (6), and the overflow water tank synchronous stacking pressure narrow pipe additionally provided with a pressing plate (1-7), a water injection pipe (1-8) and a partition plate (4-4). The fuse-plug dam section test method comprises a clay impervious body local prototype narrow groove test (F-1), a clay impervious body local prototype pressure narrow pipe (F-2), a non-viscous easily-washed gravel-soil dam body local prototype narrow groove test (F-3), an undisturbed consolidated clay grooving test (F-4) and a fuse-plug dam overall prototype narrow groove test (F-5). The method is suitable for flood fuse-plug dam experimental study, the test is simple, the manufacturing cost is low, and the test result is free of scale reduction effect.

The invention relates to a detector for radial bouncing by bore reference contract measurement. The device comprises a reference contrast detection mechanism and a positioning mechanism which are cooperatively connected via a positioning slot. Compared with the prior art, the detector has the advantages that requirement for measurement within a special size range can be met, a measuring head is protected, and the precision of repeated measurement is improved.