Tamarix chinensis tissue rapid propagation method

The invention discloses a rapid propagation method for tamarix chinensis tissues. The rapid propagation method comprises the following steps: S1, disinfection of explants: disinfecting the tamarix chinensis explants which are cut into sections by using alcohol and mercuric chloride in sequence; s2, inoculating: inoculating the disinfected explant onto a culture medium, sealing with a thin film, and culturing for at least 60 days at 24-26 DEG C under the condition of light and dark alternation to obtain a sterile seedling; the aseptic seedlings are placed in a sunlight greenhouse with a small arched shed to be subjected to seedling hardening for 3 d to 5 d, then a sealing film is removed, a proper amount of sterile water is added, seedling hardening is conducted again for 3 d to 5 d, the seedlings are transplanted to a sandy soil seedbed and cultured at the temperature of 23 DEG C to 26 DEG C and the humidity of 70% to 80%, after new roots grow out, the small arched shed is removed, normal ...

落地式人工增雨防雹火箭发射装置

Preparation method of alpha-iron oxide-lithium titanate material

The invention belongs to the technical field of preparation of lithium ion battery electrode materials, and particularly relates to a preparation method of an alpha-iron oxide-coated lithium titanate material, and the preparation method comprises the step of carrying out liquid phase mixing on deionized water, absolute ethyl alcohol, triethanolamine, a titanium source, iron oxide and a lithium source. And gelling at a certain temperature, drying, grinding and carrying out heat treatment to obtain the required nano alpha-iron oxide-coated lithium titanate material which can be used as a negative electrode material of a lithium ion battery. The preparation method provided by the invention is scientific and reasonable in design, can overcome the problems of low first coulombic efficiency, low specific discharge capacity, poor cycling stability and the like of commercial nano alpha-iron oxide, and has excellent effects of high first coulombic efficiency, high specific discharge capacity, good ...

Novel automobile skylight surface difference detection tool

The utility model discloses a novel automobile sunroof surface difference detection tool, which comprises a support substrate, sunroof imitation profiling blocks, sunroof positioning pins, a sunroof pressing mechanism and a plurality of sunroof glass height detection mechanisms, and is characterized in that the sunroof imitation profiling blocks are fixedly mounted on the left side and the right side of the upper end surface of the support substrate; a skylight glass height detection mechanism is arranged on the supporting base plate, a skylight positioning pin is fixedly arranged in a groove of the skylight roof-imitating profiling block, a plurality of skylight pressing mechanisms used for pressing the skylight guide rail are distributed and arranged on the supporting base plate on the outer side of the skylight roof-imitating profiling block, and the skylight glass height detection mechanism adopts a contact type displacement sensor which is arranged on the supporting base plate. The ...

CONTROL SYSTEM AND METHOD FOR PERMANENT MAGNET SYNCHRONOUS TRACTION DRIVE SYSTEM

A control system and a method for a permanent magnet synchronous traction drive system. The control system comprises a sampling unit and a controller, the sampling unit collecting an operational excitation current and an operational torque current of a permanent magnet synchronous motor and a capacitor supporting voltage, and a resolver having a rotor frequency. The controller obtains a target torque instruction given to a traction drive system, and calculates a target excitation current value and a target torque current value, so as to generate an excitation current adjustment value and a torque current adjustment value. A torque adjustment unit is used to generate the torque current adjustment value according to the target torque current value and an operational torque current value, generate a target modulation ratio and a modulation frequency according to the excitation current adjustment value and the torque current adjustment value output by the adjustment unit, and finally output ...

Background curtain wall for film and television special effect shooting

The invention discloses a background curtain wall for movie and television special effect shooting, and belongs to the technical field of movie shooting curtains, the background curtain wall comprises a base, fixing structures are installed at the front end and the rear end of the base, the base can be fixed through the fixing structures, supporting rods are symmetrically installed in the base, a curtain is arranged between the two supporting rods, and the curtain is arranged on the base. And a storage structure is mounted above the base. During use, the width of the curtain can be adjusted through the folding rod, the height of the curtain can be adjusted through mutual cooperation of the gear motor and the driving motor, in this way, the size of the curtain can be adjusted according to the situation of a use site, operation is very convenient and rapid, and practicability is high. And thus, the applicability of the method is improved.

Control method of energy storage system, energy storage control system and energy storage system

The invention discloses a control method of an energy storage system, an energy storage control system and the energy storage system, and the control method of the energy storage system comprises the steps: controlling a plurality of battery clusters to be sequentially connected with a confluence unit, and controlling a first insulation detection unit to detect a first insulation state between the battery clusters and the confluence unit while each battery cluster is connected with the confluence unit; controlling the target energy storage module to be connected with the power conversion module and controlling the first insulation detection unit to detect a second insulation state between the target energy storage module and the power conversion module; controlling a power conversion module in the energy storage system to be connected with the power grid, and controlling a second insulation detection unit to detect a third insulation state between the power conversion module in the energy ...

MOTOR TRAIN UNIT TRACTION CONTROL SYSTEM

Disclosed is a motor train unit traction control system. A processor host of the motor train unit traction control system is connected to a lower computer board card through a CPCI bus, and comprises a rapid operation board, a network module and a debugging module. An instruction is transmitted to the lower computer board card through the CPCI bus. At the same time, the lower computer board card transmits state information to the processor host through the CPCI bus, so as to realize the overall control inside the motor train unit traction control system. A signal sampling board and the rapid operation board perform bi-directional communication through a high-speed differential LinkPort bus, so as to realize the rapid control over an inverter power module and a four-quadrant power module. The network board card performs bi-directional communication with various board cards of an I/O module through a CAN bus, and transmits digital quantity and analogue quantity signals sent by the various ...

IGBT junction temperature monitoring method based on turn-on voltage drop platform

The invention discloses an IGBT junction temperature monitoring method based on a turn-on voltage drop platform, and belongs to the field of IGBT junction temperature monitoring, and the method comprises the steps: carrying out the preprocessing of an IGBT module, and obtaining a first IGBT module; according to the first IGBT module, auxiliary-power emitter voltage, collector emitter voltage, collector current and IGBT junction temperature of the IGBT at different temperatures are obtained by using a heating plate and an infrared thermometer; positioning a turn-on voltage drop platform according to the auxiliary-power emitter voltage, the collector emitter voltage and the collector current; obtaining a first data set according to the turn-on voltage drop platform and the IGBT junction temperature; fitting the first data set to obtain a fitting relationship between the turn-on voltage drop platform and the junction temperature; and according to the fitting relationship, establishing a junction ...

Integrated sensor for measuring speed and depth of ship

The invention discloses an integrated sensor for measuring the speed and depth of a ship, and the sensor is characterized in that the sensor comprises an integrated housing, a rod body, a depth measurement transducer, an electromagnetic sensor, a handle, a first watertight cable, and a second watertight cable; the depth measurement transducer and the electromagnetic sensor are both located in the integrated shell; the depth measurement transducer is in communication connection with the outside through a first watertight cable arranged in the cavity of the rod body in a penetrating mode. The electromagnetic sensor is in communication connection with the outside through a second watertight cable arranged in the cavity of the rod body in a penetrating mode. The integrated shell is connected with the handle through the rod body. The number of holes in the bottom of the ship can be reduced, and the safety of the ship is improved; and the ship bottom diversion design is facilitated, and the equipment ...

Fused tricyclic compound, preparation method thereof and application of fused tricyclic compound in medicine

The invention relates to a fused tricyclic compound, a preparation method thereof and application of the fused tricyclic compound in medicine. Specifically, the invention relates to a fused tricyclic compound as shown in a general formula (I), a preparation method thereof, a pharmaceutical composition containing the compound and application of the compound as a therapeutic agent, the invention relates to the field of medicines, in particular to the use as a complement D factor inhibitor and the use in the preparation of medicines for treating and/or preventing complement D factor mediated diseases or symptoms.

Service life optimization method of motor train unit traction converter IGBT (Insulated Gate Bipolar Translator)

The invention discloses a method for optimizing the service life of an IGBT (Insulated Gate Bipolar Translator) of a traction converter of a motor train unit, and belongs to the technical field of rail transit vehicles. Respectively obtaining voltage waveform data and current waveform data of a four-quadrant rectifier and an inverter by using a vehicle dynamics model and a traction converter semi-physical simulation model; based on the IGBT module power loss calculation model, the IGBT module thermal network model and the Coffin-Manson service life model, the IGBT module service life of the four-quadrant rectifier and the IGBT module service life of the four-quadrant inverter are calculated, and an IGBT module service life optimization control system is used for carrying out service life optimization. The problem that the service life difference of a traditional traction converter IGBT is large is solved, the operation and maintenance cost of a train is reduced, and the service life of ...

Full-automatic switch box production line

The invention provides a full-automatic switch box production line, and relates to the field of switch box production. A first conveying line is arranged on the left side of the inspection bottom table; the bottom of the automatic feeding mechanism is connected to the left side of the upper surface of the inspection bottom table through bolts; the detection table servo motor is fixedly connected to the middle of the upper surface of the detection bottom table; the rotary detection table is fixedly connected to the upper end of an output shaft of the detection table servo motor; four detection stations are arranged on the rotary detection table, workpieces are fed, detected and discharged on the rotary detection table through intermittent rotation of the rotary detection table, it can be guaranteed that the workpieces are in a static state during detection, meanwhile, it is guaranteed that the conveying process of the workpieces is uninterrupted, manual work is saved through full-automatic ...

Tissue rapid propagation method for Polygonum sambucifolium

The invention discloses a tissue rapid propagation method for Polygonum sambucifolium. The tissue rapid propagation method comprises the following steps: disinfecting a sectioned Polygonum sambucifolium explant I with a part of leaves by using alcohol and mercuric chloride in sequence; then inoculating the disinfected explant to a primary culture medium for primary culture; inoculating onto a subculture medium, sealing with a thin film, and carrying out subculture; the subculture aseptic seedlings are placed in a sunlight greenhouse with a small arched shed to be subjected to seedling hardening for 3-5 d, then a sealing film is removed, a proper amount of sterile water is added, seedling hardening is conducted again for 3-5 d, the seedlings are transplanted to a sandy soil seedbed to be cultured, after new roots grow out, the small arched shed is removed, normal management is conducted, and the seedlings are transplanted to a nursery land in the next year; the primary culture medium and ...