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

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.

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 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 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 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.