Disk thickener

Compared to disk thickeners disk filters (Fig. 4.48) additionally apply vacuum to further increase the consistency, production, and retention. They are used for white water cleaning in the paper machine water circuit (save-all) and for dewatering of pulp suspensions in pulping. Typical consistencies are 0.5-1.3 % at the inlet... 

Total submergence is used in the vacuum disk filter thickener (Eig. 13) in which the cake discharge, by backwashing with filtrate, occurs as each sector passes through the lowest point of the slurry tank. 

Disk machines having nozzles to discharge the soHds phase through small backward-pointing nozzles must have this power included in the calculations. Some thickening scroU centrifuges also use such nozzles, usuaUy with an intermittent flow. is the nozzle power ... 

Chemical Fire Starters Devices intended for starting fires under adverse climatic conditions, such as in wet jungles or on snow -covered terrain. The Ml fire starter is a cylindrical NC container 1.25 in diam by 3.25 in length filled with 0.8oz of kerosene thickened to a gel and provided with an ignition device, consisting of a match-head attached to a disk which covers the filling. A scratcher is attached inside a metal cap which covers the match head of the fire starter. The cap is fastened to the container with adhesive tape(Ref, pp 51-4 ... 

The disk may be very thin and inconspicuous, lining the inside of a hypanthium, or forming a thickened base for the ovary, when more developed it may be annular, cushionshaped, broken up in patches, and so on. By position relative -to the stamens it is calladi... 

A compartment syndrome model has been proposed to explain the development of CRVO. According to this model, an unyielding scleral ring at the optic disk forms the boundary of the compartment. Thrombosis of the central retinal vein may occur when vascular thickening or collagen changes in the scleral ring allow increased pressure on the central retinal vein within a confined space. 

DPV can be carried out quite successfully at a stationary electrode, such as a Pt disk or an HMDE, even though such systems do not allow physical renewal of the solution near the electrode with each measurement cycle. As we have seen above, the DPV method is based on the concept of using the preelectrolysis at potential E to establish apparent bulk concentrations, which are then interrogated with the pulse. If the system is kineti-cally reversible, the preelectrolysis can establish those conditions as well as at a renewed electrode, despite the fact that the effects of prior cycles are not erased from the diffusion layer. In fact, because the changes in potential from cycle to cycle are small, the cumulative effect of successive cycles is gradually to thicken the diffusion layer in a manner that supports the assumptions used in the treatment of wave shape and peak height given in Section 7.3.4(a). 

The process begins with a weak acid leach (pH 1.5-1.8) followed by a pH bump to 3.8-4.0 for iron, silica, arsenic and antimony precipitation. The slurry is thickened, and the solid residues are filtered and washed to recover water-soluble zinc in two stages of American disk filters. This filtration step is being upgraded as described in a following section. These iron-rich residues are then repulped and combed with the residue slurry from the oxide leaching circuit and are pumped to the smelter where the slurry is filtered, combined with other materials and process in the JCIVCET furnace. 

Interface between Body and Vibrating Surface, Devices have been developed to measure the motion of the interface between the skin and a source of vibration in contact with the body, such as a vehicle seat pan or tool handle. The former consists of a flexible disk of mbberlike material thickened at the center, where an accelerometer is mounted. The dimensions have been standardized (ISO 7096, 1982). Attempts have been made to design transducer mounts for the palm of die hand to measure the vibration entering the hand from tool handles (see, fen example, ISO 10819,1997), and also the static compressive force (i.e., the combined grip and thrust forces exerted by the hand on the tool handle). The frequency response of one such device extends to more than 1 kHz (Gill-meister et al., 2001). 

Fig. 4. (A) A disk with virtually no landmarks to indicate the future polarity of the embryo. (B) Stage 1 after Hamburger and Hamilton (HH), the prestreak, incubation for 4-8 h. After several hours of incubation, the formation of the hypoblast appears as an area of higher density roughly shaped as a triangle rising from the posterior marginal wall. This is called the embryonic shield or Roller s sickle. (C) Stage 2 (HH), the initial streak (6-10 h), a short, squat, thickening of the blastoderm at the posterior marginal zone.

The product / det det h s the dimensions of dynamic viscosity. The ratio of this product to the bulk dynamic viscosity characterizes the change in mechanical properties of the liquid in the process of separating the bodies. For steel disks, the thickening factor" (with det 10 F = 3900 dyn/cm ) has... 

The time to establish equilibrium of interaction forces between plane-parallel disks is directly proportional both to the ratio r bfMbik od to the boundary thickening factor (i.e., the viscosity affects the kinetic adhesion). The viscosity, however, has little affect on the absolute value of the equilibrium adhesive force, i.e., on static adhesion. This can be seen by analyzing Eq. (VI.2). On the one hand, in fact, with/ = const,... 

Definition 2.1.4 The direct product of a circle with a two-dimensional disk on whose boundary two connected nonintersecting arcs li and I2 are distinguished will be called a round handle (Fig. 25). A round handle (full torus) is a thickened cylinder with feet (bases) li x and I2X S. ... 

Example 6.26. Let us calculate the fundamental group of the projective plane RP using Van Kampen s theorem. Consider a standard representation of KP as a unit disk in the plane with the boundary self-identified by the antipodal map, i.e., x —x. Let A be the disk centered at the origin with radius 1/2, and let B be obtained from MP by removal of the interior of A. We have Au B = RP, and it is easy to equip RP with a CW structure such that A and B are CW subcomplexes (alternatively, one could thicken A and B a little bit so as to obtain a topologically identical open covering of RP ). 

Fine screening is followed by thickening of the suspension with disk filters and subsequent dewatering by wire or screw presses to a minimum consistency of 30%. This is the precondition for dispersing. Dispersion takes place at elevated temperatures. The temperature increase is realized by steam injection, either in a heating screw or directly in the disperser. In the dispersion stage fiurther ink detachment as well as reduction of the size of dirt specks and stickies takes place. 

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