The purpose of this study was to analyze the relationship between the critical contact angle and the torque angle in an orthodontic bracket and archwire assembly in 3 dimensions. Three-dimensional mathematical models were created with geometric bracket-archwire parameters that included 2 slot sizes, 3 bracket widths, and 3 to 4 wire sizes. From this, 3-dimensional mathematical equations (3DMEs)...

adsorption capacity of cr (vi) onto cousinia eryngioides boiss, activated carbon was investigated in a batch system by considering the effects of various parameters like contact time, initial concentration, ph, temperature, agitation speed, absorbent dose and particle size. cr (vi) removal is ph dependent and found to be maximum at ph 2.0. the amounts of cr (vi) adsorbed increased with increase...

To improve the accuracy of discrete element research, physical and simulation experiments were used to calibrate cotton stalk contact parameters. Based on stalk-stalk stalk-steel mechanics, parameters measured in experiments, software was build model. In process, Plackett-Burman experiment screen three significant factors from six initial factors. The steepest determine optimal interval A secon...

The reasonable selection of three-dimensional roughness parameters can evaluate the service performance machined surface, and its excessively high dimension greatly increases difficulty selection. In order to reveal correlation law between 3D tooth surface contact parameters, analysis theory is used explore correlation, nonlinear mapping model constructed by using BP neural network, genetic alg...