4results about How to "Extend the experiment time" patented technology

The utility model relates to a water tunnel testing device, which belongs to the technical field of fluid mechanics tests and comprises a reservoir, a drainage section, a loading section, a stabilizing section and an experimental section. Wherein the reservoir is used as a water source of the water tunnel test device; the drainage section is connected with the reservoir and comprises a drainage tube with openings at two ends having different diameters; the loading section comprises a plurality of loading branches, each loading branch is connected with the drainage tube, each loading branch is provided with a loading water pump, and each loading water pump is provided with a controller; the stabilizing section is connected with the loading section and comprises a connecting pipe, a flow velocity sensor is arranged on the connecting pipe, and the flow velocity sensor is electrically connected with each controller; the experimental section is connected with the stable section. The device accelerates fluid through gravitational potential energy provided by the reservoir and a plurality of loading water pumps of the loading section, so that the flow velocity is remarkably increased, meanwhile, the power consumption is reduced, the experiment time is prolonged, and the device can adapt to a test model with a larger size.

This invention discloses a method and apparatus for high-temperature salt spray testing in a simulated marine environment, belonging to the field of material corrosion testing technology. The apparatus includes an atmosphere control system, a microporous atomizing device, a sealed container, and a tube furnace. A perforated acrylic sheet is fixed to the bottom of the sealed container. A cotton swab is inserted into the perforated acrylic sheet, and the atomizing plate is mounted on the cotton swab using a plastic fixing kit, ensuring full contact with the swab. The power supply line for the atomizing plate is led out through an opening in the container and then sealed. An air inlet is located on the lid of the sealed container, and an air outlet is located on the side of the container. The air outlet is connected to the quartz tube of the tube furnace via a PTFE gas pipe. This invention regulates the amount of mist produced inside the container by controlling the atomizing plate and uses a gas flow meter to control the flow rate of gas entering through the inlet, thereby regulating the speed at which salt mist is output from the outlet. The solution particles generated by the atomizing plate are 2-8 μm in size. After being fully mixed with gas in the upper space of the container, they are introduced into the tube furnace. The amount of salt deposited per hour during the high-temperature salt spray test can be adjusted as needed. The device can maintain a stable temperature above 1000 ℃, and has both controllable adjustment capabilities and the ability to operate for extended periods.

The invention relates to the technical field of biology, in particular to a reagent and a method for screening a 3-sialyltransferase mutant through a high-throughput flat plate. According to the invention, by adopting a solid flat plate chromogenic screening technology and combining with a pH indicator, efficient screening of 3SL high-yield mutants in a large-scale mutation library is realized. According to the method, the target mutant is quickly identified by directly observing the color change on the flat plate, so that the tedious steps of strain construction, sequencing, transferring, shake-flask culture and the like in the traditional screening process are omitted, and the screening speed and efficiency are remarkably improved. Compared with the prior art, the method has the advantages that the experiment time is greatly shortened, the operation process is simplified, the requirements on human resources and equipment are reduced, and great convenience is provided for screening of the enzyme mutation library. The method has the technical advantages of rapidness, high efficiency and low cost, and is expected to be widely applied to the fields of biomedicine and food science.

The present application relates to a kind of pulse jet device for simulating surge condition of micro turbojet engine, jet unit and bleed air unit are all installed on test bench, and the environment simulation under the surge condition of micro turbojet engine test is realized by joint action;The bleed air unit uses external fan to supply stable high pressure airflow to jet unit by bleed air pipeline;The jet unit is located in gas collection cavity, and the phase of pulsating jet in subsection gas collection cavity is adjusted by adjusting pulsating jet angle by hydraulic unit and servo valve, and the simulation of engine surge condition is realized by the joint action of the two. The present application can realize the change of pulsating jet by changing the direction and phase of jet on the basis of micro turbojet engine test bench, and the simulation of micro turbojet engine surge condition caused by different influencing factors can be completed.