Lyophilized yeast biomass was mixed with 2 mL of 0.1 mol/L [Na.sub.2]C[O.sub.3] ([greater than or equal to]99%, Cat.# 451614, Sigma-Aldrich, Darmstadt, Germany) and the mixture was briefly ground with ballotini
glass beads (diameter 0.2 mm) in a mortar, overlaid with liquid nitrogen, and ground again.
The water/binder ratio, metakaolin content, aggregate content (glass ballotini
, 1.0-1.2 mm diameter) and curing temperature were systematically varied.
The glass beads used (Potters Ballotini
Impact Bead, silica abrasion beads; Potters-Ballotini Co., Ltd, Ibaraki-ken, Japan) ranged in size from 90 to 150 [micro]m and are quoted by the manufacturer as having 664.8 x [10.sup.3] grains [g.sup.-1].
Sample Technology of surfaces production 1 Polished surface to maximum gloss 2 Ballotini
(glass beads) blasting, grain size F120 (mean diameter 0.109 mm) 3 Corundum blasting, grain size F36 (mean diameter 0.525 mm) 4 Corundum blasting, grain size F12 (mean diameter 1.765 mm) 5 Electro-erosion machining 29A 6 Electro-erosion machining 42A 7 Electro-erosion machining 54A 8 Sandpaper, K400 9 Emery cloth, 120 10 Emery cloth, 80 11 Vertical milling machine, milling cutter 20 mm, 120 rpm, feed 30 mm/min 12 Grinding wheel, 98A 60J 9V C40 13 Grinding wheel, 96A 36P 5V 14 Vertical milling machine, milling cutter 20 mm, 120 rpm, feed 240 mm/min TABLE 2: Correlation coefficients of parameters (x-axis).
6-327 Pitture e Nernici 5-348 Plastbud Sp.z.o.o 4-651 PO.INT.ER S.R.I 4-613 Z "Police" aklady Chemiczne S.A 1-123 Poly-Chem AG 7-368 Polygon Chemie AG 7-312 Polyrheo Inc 1-645 Polystar LLC 7A-232 Portasilo Limited 6-119 Posichem 4-514 Potters Ballotini
Ltd 7-624 PPG Industries, Inc.
(2000) found that the bulk rate of heat transfer from air to a bed of 3 mm glass ballotini
was unexpectedly low because of non-uniformities in the velocity profile.
The purpose of this paper is (i) to correct these errors, (ii) to extend the analysis to describe the course of breakthrough in beds of rectangular and circular cross-section, (iii) to re-interpret the existing experimental evidence, and (iv) to present many new experimental results on the horizontal and vertical transport of miscible ionic solutions of different concentrations and densities through inert and reactive porous materials, glass ballotini
, and sepiolite, respectively.
The drying time test was determined using Ballotini
as specified by ISO 1517:1973.
Fluidized beds of ballotini
are offered as a possible alternative curing system.
1989) using food labeled with X-ray dense glass beads (Ballotini
grade 9; Jencons Scientific Limited, Leighton Buzzard, UK) added at a concentration of 7% by mass.
We investigate some problems that might arise in these circumstances by conducting miscible displacement experiments using the steady flow of simple ionic solutions through 2 saturated porous materials, one inert (glass ballotini
) and one reactive (sepiolite).
The gas flow apparatus was trialled using five granular soils with different particle characteristics: fine ballotini
(glass beads); 'dark mineral sand' (ilmenite); fine granular industrial silica; fine natural 'Stockton beach' (silica) sand and a 'coarse river sand fraction' ([less than or equal to] 4 mm; silica and lithic fragments).