Graphene oxide (GO) was modified by 1,4−cyclohexanediamine (CDA), and polyvinyl alcohol (PVA) was crosslinked by 4−sulfophthalic acid (SPTA). Hydrophilized polyvinylidene fluoride (PVDF) ultrafiltration membrane as support, SPTA−PVA/CDA−GO/PVDF composite membrane was prepared through vacuum filtrati...

For a kind of gas burner, the appropriate size of the combustion chamber is selected to match, and then a complete calculation area was formed. Natural gas fuel and combustion air were injected into the combustion chamber through the gas burner to realize the complete combustion process. By simplify...

An oil-gas pulse flushing method was proposed to remove contaminants in the pipe by changing the charging time to generate a pulse oscillating flow. The oil-gas pulse dynamic model and the mathematical governing equation were established, user defined function (UDF) secondary development based on An...

The summer air in the area with hot summer and cold winter is humid, so dehumidification is the key task of air-conditioning. Aiming at the problem of insufficient dehumidification capacity of the fresh air unit in the temperature and humidity independent control air-conditioning system, the double ...

In view of the high cost of current underground pipeline trajectory measurement system based on inertial navigation principle, the cost of the system was effectively reduced by reducing the number of inertial sensors. Firstly, the formula of using only uniaxial angular velocity and biaxial accelerat...

The permanent magnet synchronous motor (PMSM) has a high requirement on the smoothness of torque output. Due to influences of groove torque, reluctance torque pulsation, electromagnetic torque pulsation and other factors, the output torque pulsation of the interior PMSM is relatively large, which in...

Based on the Volterra series, a hybrid Π type equivalent circuit was used to model the common-emitter amplification circuit according to the characteristics of the Class AB power amplifier. The nonlinear components in the amplifier were described and analyzed to obtain a model of the system behavior...

The analytical inverse solution of 2UPR/UPS/UP+AC pendulum hybrid mechanism was derived. With 2UPR/UPS/UP mechanism as the research object, the single-joint error model and branched-chain error model were systematically expounded , and the related geometric error sources were given. The error mappin...

Location and mapping is one of the key technologies for autonomous driving. With limitations of lidar sensors or vision sensors, the advantages of different sensors can be brought into play through multi-sensor fusion and the accuracy and robustness of location and mapping can be improved. The Harri...

In order to improve the adaptability and tracking stability of autonomous vehicles to different roads, a lateral and longitudinal trajectory tracking method based on road boundary constraints and dual proportional-integral-derivative (PID) was proposed. Based on the road boundary constraints, the st...

The pantograph-catenary offline has many adverse effects on the safe operation of the subway. Firstly, the simulation model of pantograph-catenary offline traction system was established, and then the offline conditions of different durations were simulated. By analyzing the transient process of the...

According to shortcomings that the evaluation methods used in emergency drills are single in urban rail transit, there is strong subjectivity in the weights of evaluation indicators and it neglects of the objective links between them, an evaluation model based on AHP−risk network was proposed. The o...

Under the normalization of the epidemic, the additional health detection link in the airport terminal has made the check-in process longer and inefficient. On the basis of analysis for current situation of check-in process of an airport terminal in China, a process model based on Petri network check...

Nickel-based superalloy Inconel718 can maintain excellent mechanical properties at high temperatures above 600 ℃, so it is widely used in aerospace and other important scientific and industrial fields. It is a difficult-to-process material for situations of large drilling force, high temperature in ...

Thermal deformation behavior of 304 stainless steel was investigated by utilizing Gleeble−3800 thermo-mechanical simulator. The true stress-strain curves of 304 stainless steel were obtained through the hot compression experiment with temperature range of 800~1200 ℃ and the strain rate range of 0.00...

Using the interferograms obtained by Mach-Zehnder interferometry, it was introduced how to use Interferometrical data evaluation algorithms (IDEA) software to realize processes of Mask, 2D Fast Fourier Transformation and Phase Unwrapping, thus phase shift distribution diagrams corresponding from the...

In order to improve the pressure comfort of indoor climbing tight sportswear under different technical actions, four tight-fitting climbing sportswear were designed through different structural divisions and fabric splicing, and the dress comparison experiment was carried out with the popular two in...