Microscopic glass beads

Jet cleaning of channels with hot aluminium oxide powder, or use of microscopic glass beads in special chambers, are applied for cleansing purposes when HR systems are being renovated. 

Fig 25 Comparison of microscopic particle size distribution with the average distribution of four identical runs made with the Coulter Counter (Sharpies standard glass bead sample, type XC-3)... 

A novel flow cell has been developed to observe on a microscopic level the steady state, cocurrent flow of two pre-equilibrated phases in a porous medium. It consists of a rectangular capillary tube packed with a bilayer of monodisperse glass beads 109 microns in diameter. The pore sizes in the model are of the order of magnitude of those in petroleum reservoirs. An enhanced videomicroscopy and digital imaging system is used to record and analyze the flow data. 

Figure 4 Thin sections of the Ifim glass bead samples observed by microscope...

These polyurethanes (and their precursors or analogues) were cast from an appropriate solvent, usually DMF, onto the glass bead surfaces used in the in vitro test for platelet retention (4), or for the thrombin absorption test used previously (2). Crystals of KBr for Fourier transform infrared (FTIR) spectroscopy and glass microscopic slides for examination by XPS (ESCA) served as supports for polymers cast from the same solvents. Concentration of polymer (5 wt %), temperature of casting... 

Electrolyser of this type can be used to remove metals from their dilute solutions. For example, an electrolyser of the firm CHEMELEC (England) permits the concentration of heavy metal ions to be lowered to 100 mg per litre at an acceptable current yield (tens of per cent). The metal deposited on a plate or rod-shaped cathode can be used as an anode in galvanic plating. There were some doubts about the purity of the recovered metal, which was supposed to contain microscopic glass particles, presumably from disintegrated glass beads. If this... 

The second major objection to the Langmuir and BET formulations derives from consideration of the adsorbent surface. Both models assume a finite number of uniform sites available for adsorption, but even cursory microscopic evaluation of surfaces of interest in chromatography demonstrates that with the possible exception of smooth glass beads, this is rarely the case. Surfaces such eis diatomaceous earth, silica, etc. are highly heterogeneous and, in addition, possess microporous structure, the adsorptive properties of which can be much different from those of the surface (14). 

Spherical particles such as glass beads are often to be found retained in the mesh of woven sieves at the conclusion of a sieving process. If the size distribution of these retained particles is carefully measured using a calibrated microscope then an estimate of the range of mesh sizes for a particular sieve can be obtained. 

Concentration of the polymer, temperature, and evaporation conditions under argon were maintained as closely as possible, specially with casting microscope slides and glass beads, so that the surface morphology in ESCA and platelet retention tests were about the same. 

Figure 2.1 The Appearance of Isolated Gram-positive Bacterial Cell Walls under the Electron Microscope A, Staphylococcus aureus (X 30,000) B, Bacillus subtiHs (X 50,000). Whole cells were disrupted by vigorous shaking with glass beads, walls were deposited by cetrifugation, washed and treated with phenol to remove contaminating membrane and cytoplasmic material.

Fractions of eluted glass beads were collected by a model FC-80K microfractionator from Gilson Medical Electronics (Middletown, WI, USA). The beads were examined by an optical microscope from Olympus Optical Co. (Tokyo,... 

Volume density and cumulative distribution and microscope picture of glass beads... 

In order to analyze the effect particles have on superheated atomization, suspensions consisting of deionized water and glass beads are sprayed. The polished glass beads are Silibeads Type S (Size 0-20 pm). The solids concentration is set to 5,15, and 25 wt%. The volume density and cumulative distribution of the beads are given in Fig. 16.9. The major part of the particles is smaller than 10 pm. The beads have a smooth surface as shown in the microscope image in Fig. 16.9. 

Fig. 6 A 0.5 -inch-long grooved cobalt mandrel is inserted into tubing, which is sealed on both ends with medical adhesive. The grooves are intended to simulate the spaces between pacemaker lead conductor coils. A 1-mm-diameter hole is made in one end to assure ingress of exudate/transudate. Samples are tied together in strings, identified with a colored glass bead, and implanted in the subcutis of rabbits as shown in Fig. 3. After optical microscopic examination, the samples may be analyzed by FTIR, HPLC molecular weight, SEM, and other suitable techniques...

Rimai et al. used a scanning electron microscope to directly image the contact radii of microparticles deposited on surfaces. For glass beads on polyurethane surfaces, the relation between sphere size and contact radius was well described by JKR model [886], whereas for polystyrene beads on silicon wafers [887], only inelastic contact models could explain the observed relation. 

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