Plastic beads

Plastic bags Plastic beads Plastic bearing materials Plastic cements Plastic drums Plastic electronic package Plastic encapsulant... 

Fig. 7. A bead filter, one of many types of biological filters, shown in association with a laboratory-scale recirculating water system. Small plastic beads inside the fiber glass chamber provide surface area for colonisation by bacteria that convert ammonia to nitrate.

To reduce the amount of dust produced, water can be added to the abrasive from a circular water sprayer around the no22le. Chemical corrosion inhibitors must be dissolved in the water to prevent flash msting of the steel. Newer methods to reduce dust include the use of ice, soHd carbon dioxide (dry ice), or plastic beads as abrasives. Blasting with dry ice is inexpensive and effective, but the accumulation of carbon dioxide must be avoided in enclosures. Plastic beads are inexpensive, but the cutting efficiency is low and paint removal is slow the beads can be cleaned of paint particles and reused. 

Softer metals such as aluminum and its alloys can be blast cleaned using abrasives that are not as hard as those used on steel. Garnet, walnut shells, corncobs, peach pits, glass or plastic beads, and soHd carbon dioxide have been used successfully. 

The LLW from nuclear power plants contains ion exchange resins as well as clothing, tools, and chemicals. Ion exchange resins, which comprise the majority of this LLW, are used to filter the water circulated in nuclear power plants. The ion exchange resins isolate and trap dissolved materials, much of which can be radioactive. Approximately three-fourths of commercially or privately generated LLW is in the form of the contaminated plastic beads that make up ion exchange resins. 

Golding, N. S. 1959. A solids-not-fat test for milk using density plastic beads as hydrometers. J. Dairy Sci. 42, 899. 

There are two solutions to soften water that is too hard. First, the water could be filtered to remove all of the calcium and magnesium ions. But this can be very expensive, so most people use a water softener instead. A water softener is a piece of equipment that can be attached to the water pipes that run into a house. This way, all the household water goes through the water softener before going into the other pipes in the house. Inside a water softener are small plastic beads. These beads have sodium ions (Na+) stuck on them. As the water flows over the bed of beads, the magnesium and calcium ions get replaced with the sodium ions. Since sodium is easily dissolved in water, it does not precipitate out in pipes like calcium and magnesium ions do. As a result, no scales form inside the pipes. Sodium ions do not react with soap to form soap scum, either, and they allow the soap to lather properly. 

Aliquat 336 TEVA-Resin "Tc sensing in water using column containing mixture of TEVA-Resin particles and scintillating plastic beads Radiometric column sensor 96,97... 

Large, colored glass or plastic beads colored posterboard X-ACTO knife rigid... 

Use colored glass or plastic beads and cut additional shapes from colored posterboard to create several mobile pieces. 

For plastic beads with pp = 500 kg/m3 falling in air at ambient conditions, estimate the range of variation of the shedding frequency of the particle wake when the particle Reynolds number, based on the particle terminal velocity, varies from 500 to 1,000. For this particle Reynolds number range, what is the corresponding range of variation for the particle sizes ... 

Efficiencies for the two types of columns were both somewhat low at about 1500 theoretical plates for the plastic bead column and only about 1000 for the silica particle columns the latter were more prone to deterioration from crop co-extractives, dropping to only about 600 after months of use, while the plastic bead column was not measurably affected. 

Glass-coated and plastic beads are available from Cellon (Bioglas beads), ICN (Rapid Cell G and Rapid Cell P) and Nunc (Biosilon) and do not swell in aqueous solutions. They are sterilised by autoclaving at 121° for 15 min in water. 

Fig. 3.8. L929 cells were seeded in 100 ml GMEM with 10% calf serum at 3 cells per microcarrier bead onto 5 x10s Cl-(Cytodex 1), P(Biosilon) or G (Bioglas) beads. The cell number was estimated by releasing the cells with trypsin, briefly allowing the beads to settle and counting the cells with a Coulter counter. Difficulty was encountered releasing the cells from Cytodex, but cells attached only weakly to the glass and particularly to the plastic beads and many cells were free in suspension. The use of electronic cell counters is not recommended for counting cells released from microcarriers as the orifice occasionally becomes blocked by small microcarriers in the...

Because they do not swell 1 g of glass coated or plastic beads will contain only about 230,000 microcarriers of surface area 30 cm2. Bead loadings of 40 g/1 are recommended. 

Wash the beads by decantation and resuspend in the swelling buffer. Glass and plastic beads can be suspended in water. 

Dispense into appropriate bottles at about 1 g per bottle for the beads that swell or 10 g per bottle for the glass and plastic beads. 

This approach is unlikely to be successful with the glass or plastic beads to which cells appear to attach only poorly at all stages of the cell cycle. 

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