Cassette

Gd converter can be used. Both techniques were studied and compared with the common direct neutron imaging with Gd metal converter (0.1mm thick) and single coated fine grained radiographic film, exposed in a vacuum cassette. The unprotected IP ( TR type ) in combination with the Gd metal converter were also exposed in a vacuum cassette. Our experience can summarized as follows ... 

Exposures were detected at energies of 25 and 45 MeV for the home roentgen film types PT-1, PT-5 and import types D4, D7, Agfa-Gevaert , MX-5 Kodak . The lead strengthening screens were used for roentgen survey. Cassettes were loaded according to 2H3 scheme. In the experiments focal distances (F) came to 1.5, 2.0, and 3.0 m. 

IP formats up to 35x43 cm can be handled automatically in full daylight. If an exposed cassette is inserted in the scanner the following actions are performed ... 

Additionally, attempts are being made to streamline the gravure process by improving make-ready times. Press manufacturers Cemtti and Albert-Frankenthal are working on cassette systems where jobs are prepared outside the press and subsequently loaded with virtually 2ero stop time. Computer control of press functions such as compensators, angle bars, and folders also help reduce press make-ready time. 

Polystyrene (PS). Common appHcations include packaging, food containers, and disposable tableware toys furniture, appHances, television cabinets, and sports goods and audio and video cassettes. For some of these appHcations, PS is modified by blending or graft polymerization with SBR to form impact polystyrene, which is less sensitive to breakage. Expandable polystyrene is widely used in constmction for thermal insulation. 

Polaroid introduced Polavision, a Super-8-mm instant motion picture system, in 1977 (97). Polachrome CS 35-mm sHde film followed in 1982 (98), and a high contrast version, Polachrome HCP, appeared in 1987. Each of the films comprises a very fine additive color screen and an integral silver image transfer film. The Polavision system, which included a movie camera and a player that processed the exposed film and projected the movie, is no longer on the market. The Polavision film was provided in a sealed cassette, and the film was exposed, processed, viewed, and rewound for further viewing without leaving the cassette (97). 

Polachrome is provided in standard-size 35-mm cassettes. Its processing is carried out in a Polaroid Autoprocessor using a processing pack that contains a reagent pod and a strip sheet (98). 

Other The cassette (Fig. 22-54), a modification of a plate-and-frarne device that is favored because of the ease of scale-iip from lab-oratoiw to small plants is widely i ised in pharrnace i itical microfiltration and iiltrafiltration. An entirely different module also called a ca.s.sette is used in the IVIF of vv ater. There are a host of other clever module designs in use, and new ones appear frequently. 

FIG. 22-54 Expl oded view of cassette membrane assembly. Couiiesy Milli-pore Coiporation.)... 

Cassettes Cassette is a term used to describe two different cross-flow membrane devices. The less-common design is a usually large stack of membrane separated by a spacer, with flow moving in parallel across the membrane sheets. This variant is sometimes referred to as a flat spiral, since there is some similarity in the way feed and permeate are handled. The more common cassette has long been popular in the pharmaceutical and biotechnical field. It too is a stack of flat-sheet membranes, but the membrane is usually connected so that the feed flows across the membrane elements in series to achieve higher conversion per pass. Their popularity stems from easy direct sc e-up from laboratoiy to plant-scale equipment. Their hmitation is that fluid management is inherently veiy hmited and inefficient. Both types of cassette are veiy compact and capable of automated manufacture. 

Because of their rigidity they are being looked at particularly as replacements for metals such as die-cast zinc alloys. Early uses to become established include portable stereo cassette recorders. Other applications include mowing machine components, electrical plugs, sockets, TV tuner blocks, pulleys, shafts and gears. 

Styrene (vinyl benzene) QH5CH=CH2 Polymers (CgHaln for audio and video cassettes, carpet backing, domestic appliances, packaging, food containers, furniture, toys, vehicle parts... 

Attach the collection device (filter cassette, charcoal tube, etc.) to the shirt collar or as close as practical to the nose and mouth of the employee). Employee exposure is that exposure which would occur if the employee were not using a respirator. The inlet should always be in a downward vertical position to avoid gross contamination. Position the excess tubing so as not to interfere with the work of the employee. 

Check pump status every two hours. More frequent checks may be necessary with heavy filter loading. Ensure that the sampler is still assembled properly and that the hose has not become pinched or detached from the cassette or the pump. For filters, observe for symmetrical deposition, fingerprints, or large particles, etc. Record the flow rate, if possible. 

Set up the calibration apparatus, replacing the cassette with the impinger/bubbler lined with the amount of liquid reagent specified in the sampling method. 

Figure 2. For calibration, the cassette is attached to an electronic bubble meter as shown in the illustration.

Use fully conductive cassette with conductive extension cowl. 

Assure that the bottom point (between the extension and the conical black piece) of the cassette is sealed tightly with a shrink band of electrical tape. Point the open end of the cassette down to minimize contamination. 

Assemble the polystyrene cassette filter holder, using the appropriate filter for the sampling method. Compress cassette by using a mechanical press or other means of applying pressure. Use shrink tape around cassette... 

Repeat the procedures described above for all pumps to be used for sampling. The same cassette and filter may be used for all calibrations involving the same sampling method. 

In reassembling the cassette assembly, remember to add the unweighed backup pad. 

When weighing the filter after sampling, include any loose material from an overloaded filter and cassette. At all times take care not to exert downward pressure on the weighing pans. Such action may damage the weighing mechanism. 

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