Plastic coverings

Concrete pressure vessels may be used in applications that require large sizes. Such vessels, if made of steel, would be too large and heavy to ship. Through the use of posttensioned (prestressed) concrete, the vessel is fabricated on the site. In this construc tion, the reinforcing steel is placed in tubes or plastic covers, which are cast into the concrete. Tension is applied to the steel after the concrete has acquired most of its strength. 

Corrosion of the fasteners occurred due to their galvanic interaction with passive stainless steel. Deterioration was rapid because of the unfavorable area ratio formed by the large areas of stainless steel and the small area of the fasteners, which was further reduced by the incomplete plastic covering overexposed fastener surfaces. 

Flexible duct A non-rigid duct that can be bent, expanded, or compressed within set limits without fracturing its cloth, metallic, or plastic covering. 

One centrifuge was powered by a hydraulic oil installation 2-3 m away. A leak of oil from a cooler was ignited, and the fire was spread by oil and product spillages and by plastic-covered cables. It destroyed the plastic seal between the centrifuge and its exit chute. There was an explosion in the chute and a flash fire in the drier to which it led. The centrifuge exit valve was closed, but the aluminum valve actuator was destroyed. Fortunately, the exit valve did not leak, or several tons of solvent would have been added to the fire. Aluminum is not a suitable material of construction for equipment that may be exposed to fire. 

A pressure pad, also used as a form of trap protection, is a flat rectangular, plastic-covered contact placed at strategic points underneath a carpet. 

Failure Of Plastics , Witold Brostow, Roger D. Comeliussen Hanser Gardner Pubis (1986) ISBN 1569900086. Complete reference on the mechanical failure of plastics. Covering theory and practice, this book describes an expert knowledge base and provides directions for future work toward elimination of mechanical failure of plastics under varied conditions. 

In the dark, film is placed on top of the envelope and the cassette closed so that the film is pressed tightly against the plastic-covered membrane. 

Cascone G, Arcidiacono C, D Emilio A, Mazzarella R (2005) Radiometric properties and field performances of different greenhouse plastic coverings. Acta Hort (ISHS) 691 693-700... 

ISO 6123-1 1982 Rubber or plastics covered rollers - Specifications - Part 1 Requirements for hardness... 

Nazer, I.K. and Mosoud, H.A. Residues of dicofol on cucumber grown under plastic covers in Jordan, J. Environ. Sci. Health, B21(5) 387-399, 1986. 

Figure 7. Polythene Beaker Used in Germination Experiments A, Plastic cover B, Seeds C, Filter Paper D, Open beaker employed in the "volatiles method" (13) (by permission of Blackwell Scientific Publications).

Another aspect of minerals and rocks laser-induced luminescence became important recently, especially in Israel. Terrorists have intensively used roadside Ijombs, while the plastic covers simulating local rocks have been used for camouflage of explosive materials. The possibilities of the luminescence method have been checked for the remote detection and identification of such camouflage materials. The luminescence properties of the colored plastics have been investigated in comparison with the corresponding properties of the dolomite rocks, which are imitated. 

In Fig 4, Method A is for single shots Method B is for multiple shots or rotation firing in wet holes and Method C for multiple shots or rotation firing in dry holes or for wet holes providing plastic covered fuse is used... 

When signal hits water, the plastic cover collapses, thus allowing water to force the dye out thru the tail of the bomb. The resulting bright-green spot of dissolved dye on the surface of water permits one to locate the place where the bomb hit the water (Ref 51a, p 5-28)... 

Two types of fuse are in common use by the US Army (1) blasting time fuse that has a spiral wrapped outer cover usually colored orange and (2) safety fuse M700 that has a smooth green plastic cover with Length markers of abrasive material (so they can be felt in the dark). These two types of fuse are shown in Fig 2 (Ref 1)... 

ISO 7267-1, 1997. Rubber and plastics covered rollers - Method of test - Determination of apparent hardness (IRHD method). 

Some practical designs for proportional counters are shown in Figure 18.5. In the cylindrical detector, a very thin window of split mica or Mylar plastic covers one end of the tube. It can be so thin (down to 150 p.g/cm3) that the absorption of a particles by the window is not extensive. An even more efficient arrangement is found with the hemispherical detector, where the radioactive sample can be introduced directly into the detector chamber. In the hemispherical detector, one detects 50% of all the... 

Figure 7 is a photograph of the 2300-sq.-foot air-supported plastic still. This still consists of rows of separate channels, each provided with a waterproof plastic basin and an air-supported transparent plastic cover. The design incorporates a relatively shallow basin, containing only a few inches of water, so that there is much less thermal inertia than in the deep-basin still. 

Nitroheptane. Prepare a solution of pertrifluoroacetic acid in acetonitrile as follows. Place 50 ml of acetonitrile in a two-necked, 250-ml round-bottomed flask fitted with a dropping funnel and a reflux condenser. Insert a plastic-covered magnetic stirrer follower bar and cool the flask in an ice bath sited on the stirrer unit. To the cooled and stirred solution add 5.8 ml (0.2 mol) of 85 per cent hydrogen peroxide (1) and then 39.0 ml (58.1 g, 0.24 mol) of trifluoroacetic anhydride. Stir the solution for 5 minutes and then allow to warm to room temperature. In a three-necked, 500-ml round-bottomed flask fitted with a sealed stirrer unit, dropping funnel and reflux condenser place 200 ml of acetonitrile, 47 g (0.56 mol) of sodium hydrogen carbonate, 2g of urea and 12.9g (0.1 mol) of dipropyl ketoxime. Heat the stirred suspension under reflux on the water bath and add dropwise over 90 minutes the prepared solution of pertrifluoroacetic acid. When the addition is complete heat the mixture under reflux for 1 hour. Pour the cooled reaction mixture into 600 ml of cold water and extract with four 100 ml portions of dichloromethane (note the organic layer is the upper layer in the first extraction, but subsequently it is the lower layer). Wash the combined extracts with... 

The following hydrated autoclave method can be employed for immunohistochemical detection of molecules in both cultured cell and tissue specimens. The method was used, for example, to localize androgen receptor in cultured LNCaP cells (derived from prostatic carcinoma metastasized to lymph node) and biopsy specimens from patients with prostatic carcinoma (Ehara et al 1996). After being removed from the culture medium, the cells on plastic cover slips are fixed with 10% formalin for 10 min at 20°C. Tissue specimens are fixed for 1-2 days and embedded in paraffin. Sections (5 pan) are cut, mounted on glass slides, and heated in an oven for 1 hr at 42°C to promote adherence to the slide. After deparaffmizing and rehydration, the sections are subjected to epitope retrieval treatment as follows. 

Get a coaxial cable of 5-10 cm length. Strip the plastic cover of its end in order to leave exposed approximately 2 cm of the Cu wire. The wire exposed will be used as the substrate for the sensor membrane. In the same way, strip approximately 1 cm of the other end s cover. This will offer a mean for the sensor s external electric connection. 

Why do you paint the inside of the coffee can and the plastic cover black ... 

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