This article deals with experimental and theoretical studies of the sedimentation of polydisperse agarose beads with broad particle size distributions. A light-extinction principle was used to measure the variation of solid concentration in the suspension with time and settling distance. Di4erent experimental conditions have been used to show the in5uence of solid concentration and liquid densi...

Design of primary settling tank has historically been done more empirically than rationally. The main reason for this is a lack of understanding of what pollutants primary settling tank are capable of removing. Inlets should be designed to dissipate the kinetic energy or velocity head of the mixed liquor. They should be able to distribute the flow equally in vertical and horizontal directions. ...

In one space dimension, the phenomenological theory of sedimentation predicts the sedimentation–consolidation behavior of a flocculated suspension in dependence of two constitutive functions describing its material behavior, the solids flux density (or hindered settling function) and the solid effective stress. These functions are assumed to depend only on the local volumetric solids concentrat...

An analytical solution of the equilibrium distribution of suspended sediment concentrations (SSC) in an estuary along the longitudinal axis is extended to include variable width. A turbidity maximum is formed at the convergence of fluxes from freshwater discharge and (vertically well mixed) salinity gradients. Simple scaling relationships control the longitudinal distribution of SSC and depend ...

There are two constitutional political formations in Iranian Baluchistan. One is the tribe, which is the ultimate kin group to which loyalty is owed (Salzman 2000: Ch. 11). The other is the hakomate, a complex formation consisting of a small ruling elite, settled peasantry, and nomads, and which is integrated on bases other than loyalty (Salzman 1978a). I call the tribe and the hakomate “consti...

THE colours and forms of moths and butterflies have inspired artists and poets for centuries. One of the oldest industries to evolve from insects is sericulture, or silk production. According to Confucius' records, silk was discovered in the third millennium B.C. in China. The Chinese held a monopoly over silk to the extent that anyone attempting to export silk came under the death sentence by ...

abstract settling basins are essential hydraulic structures which have to be designed and constructed at all river water intakes to remove most of suspended sediments which enters the intake by flowing water. there have been many techniques for designing these structures. to simplifying the design procedure, some of these techniques have been applied many assumption and some others are so compl...

given by (6) can successfully shorten the settling time of h e tracking control at different operation speeds. In our experimental setup the settling time is in the range of 0.50 N 0.65 s for the conveyor belt running between 9.43 N 26.60 c d s . As we have seen, this is a great improvement in the tracking control compared with that where no special care is taken to compensate for the feedback ...

The paper utilizes the Virtual Reference Feedback Tuning methodology for the iterative way of controller design and fine-tuning. It uses a series of experiments with no restriction on data generation to design an optimal controller of desired structure without the intermediate plant identification step. The approach is shown to be successful for the design and fine-tuning of a controller for a ...

The background to this work on the parthenogenetic winged form of Aphis fabae Scop, is given in two earlier papers (Kennedy & Booth, 1963a, b: referred to hereafter by date only), where it was shown that aphids allowed to fly and alight freely in a laboratory flight chamber become increasingly ready to settle down, feed and larviposit on a leaf the longer they have flown. Flight and settling ar...