This paper is concerned with the statistical model development issues, necessary for rapid estimation of the rotor sizing for single main rotor helicopters at the preliminary design stage. However, Central Composite Design (CCD) method, simulation-based data collection, linear regression analysis, mathematical modelsdevelopmentand validations through the analysis of variance (ANOVA) were perfor...

The present work is an attempt to model, analyze, and control the flow at the base of an abruptly expanded circular duct by using design of experiments (DOE) and response surface methodology (RSM). Tiny-jets in the form of orifice were positioned at an interval of 900, 6.5 mm from the primary axis of the main jet of the nozzle. Experiments were conducted to measure two responses namely, base pr...

in this article a comparative study for modeling and optimization of 2-methylpropane-2-thiol removal from contaminated soil by ultrasound is investigated. central composite design (ccd) and artificial neural network (ann) were utilized and compared to each other in order to obtain appropriate predicting model with respect to sonication power (w), sonication time (min) and water/reactor volume r...

It has been remarked that CCD circuits, unlike transistor circuits, must A new approach to designing low-power, be monolithically integrated to function. compact, charge-coupled device (CCD), Unfortunately, confinement of the signal analog, VLSI circuits for signal charge to the semiconductor inhibits the processing is described. A charge domain implementation of circuit topologies in wire tran...

Abstract Controlled molecular transport and separation is of significant importance in various applications. In this work, we presented a novel concept nanofluidic charge-coupled device (CCD) for controlled DNA separation. By leveraging the unique field-effect coupling systems, CCD aims to store charged biomolecules such as DNAs discrete regions nanochannels transfer separate these charge packe...

The purpose of this study was the investigation of the removal of phenol with nanoparticles zero valent iron and iron powder. The effect of various parameters such as initial concentration, pH, contact time, and dosage of NZVI and Fe powder was examined, and a Central Composite Design (CCD) was then applied to appraisal the effect of these variables. The chemical and physical characteristic...