6results about How to "Reduce experimental risk" patented technology

The utility model provides a cell directional attachment membrane material device which comprises an outer chamber, an inner chamber, an inner chamber, an outer chamber and an inner chamber, wherein the top of the outer chamber is provided with an outer chamber opening; the inner chamber is nested in the outer chamber, the diaphragm material is placed in the inner chamber, a fixing part is arranged at the bottom of the inner chamber, the diaphragm material is fixed in the inner chamber through the fixing part, an inner chamber opening is formed in the top of the inner chamber, and the inner chamber opening is formed in the outer chamber opening; and the upper cover covers the top of the outer chamber and is used for sealing the opening of the outer chamber. The fixing part is arranged at the bottom of the inner chamber, and the membrane material is fixed in the inner chamber through the fixing part, so that the risk that the membrane material floats or moves or the specific surface is changed due to the flowing environment of the cell culture fluid is reduced, and the experimental risk is reduced. The upper cover can seal the opening of the outer chamber, so that the cell directional attachment membrane material device is prevented from being polluted.

The invention discloses polymethylsilane capable of regulating and controlling the C / Si atomic ratio and a preparation method and application thereof.The preparation method comprises the steps that metal sodium is cut and crushed, and metal sodium fragments are obtained; adding the metal sodium fragments into an organic solvent, and heating until the metal sodium is in a molten state to obtain a mixture; stirring and cooling the mixture to obtain a sodium sand mixture; mixing methyl dichlorosilane, allyl methyl dichlorosilane, tetrahydrofuran and 15-crown ether-5, and then dropwise adding the mixture into the sodium sand mixture to react; the sodium sand in the preparation method has the characteristics of uniform particle size, high activity and clean surface; tetrahydrofuran and 15-crown ether-5 are added into dichloromethylsilane and allyl methyldichlorosilane, so that the single electron transfer rate of metallic sodium to dichloromethylsilane can be increased, the reaction activation energy can be reduced, the reaction efficiency can be improved, the molecular structure can be optimized, the loss of carbon elements can be made up, and the problem that PMS is rich in silicon after pyrolysis can be solved.

The invention discloses an Ansys thermosetting coupling analysis method for a brake disc based on Spaceclaim, relates to the technical field of brake disc thermosetting coupling simulation, and aims at solving the problems that an existing racing car brake disc thermosetting coupling analysis method is complex in working condition, large in calculation amount and not easy to operate. The method is technically characterized by comprising the steps that firstly, a brake disc and friction plate model is established and imported into finite element analysis software Ansys, materials are selected for the brake disc and the friction plate, material attributes are input, and the step number and time are set; 2, boundary conditions are applied, force generated by braking is regarded as a linear process, and braking force is applied; step 3, repairing the distorted grid; 4, defining a contact surface as friction, a formula as a generalized Lagrangian method, updating rigidity as each iteration, and the rest as program control, setting a connection mode as geometry-ground, and a type as revolution; and 5, temperature distribution and deformation quantity are obtained through thermosetting coupling analysis.

This invention discloses a method for preparing polymethylsilane. The method includes cutting and crushing metallic sodium to obtain sodium fragments; adding the sodium fragments to an organic solvent and heating to a molten state to obtain a mixture; stirring and cooling the mixture to obtain a sodium sand mixture; mixing dichloromethylsilane, tetrahydrofuran, and 15-crown ether-5 and then adding the mixture dropwise to the sodium sand mixture for reaction, followed by cooling, solid-liquid separation, and distillation. This preparation method obtains a sodium sand product with uniform particle size, high activity, and clean surface by rapidly cooling after high-temperature dispersion of metallic sodium in a specific organic solvent system. By adding tetrahydrofuran and 15-crown ether-5 to dichloromethylsilane, the single electron transfer rate of metallic sodium to dichloromethylsilane can be increased, the activation energy of the reaction can be reduced, and the reaction efficiency can be improved. Furthermore, the continuous dropwise addition saves reaction time.

The invention provides a wind power conversion controller hardware-in-the-loop joint simulation test platform. The wind power conversion controller hardware-in-the-loop joint simulation test platform comprises an RT-LAB real-time simulation subsystem, a wind power conversion controller and a PLC industrial simulation subsystem. The RT-LAB real-time simulation system simulates and realizes electromagnetic transient simulation of a converter main circuit, a motor and a power grid, and the PLC industrial simulation system simulates and realizes peripheral industrial communication and peripheral logic simulation of a converter controller, so that a controller closed-loop test environment under a dual-simulation system collaborative architecture is formed. The method has the beneficial effects that the wind power conversion controller works in a fan system environment close to the reality, and a complete signal system of the converter in actual operation is restored to the maximum extent by improving the simulation coverage rate of a hardware interface and the precision of a test model; united closed-loop verification of the wind power conversion controller under a high-precision electrical environment and a real industrial communication protocol is realized, and the consistency of hardware-in-loop simulation operation of a controller product and actual prototype operation is ensured.

The utility model relates to the technical field of electrical equipment, and discloses a temperature rise current tracking and adjusting experiment device, which comprises a base, and is characterized in that the rear end surface of the upper end of the base is connected with a bracket, clamping blocks are respectively arranged on the periphery of the upper end surface of the base, and a current box is arranged in the center of the upper end surface of the base; two rotating motors are installed on the surfaces of the two sides of the outer end of the base respectively, the PLC collects data of the current sensor and the voltage sensor in real time and compares and analyzes the data with preset experiment data, circuit data are automatically adjusted, if the current value deviates from the preset range, the PLC can rapidly adjust the output power of a power source, the current returns to the preset value, and the power source is switched on. The stability of the temperature rise current in the experiment process is ensured, and a reliable current control condition is provided for the experiment for researching the relation between the current and the temperature rise.