Physical properties Machine data

Single-screw extruders and most other processing machines are volumetric metering devices. That is, the extruder will discharge a volume of resin for each revolution of the screw. Since the processor requires rate data in mass units (kg/h), the melt density is a needed physical property. The melt density for polymers is always less than the solid density of the material, and the melt density decreases further... 

A more common use of informatics for data analysis is the development of (quantitative) structure-property relationships (QSPR) for the prediction of materials properties and thus ultimately the design of polymers. Quantitative structure-property relationships are multivariate statistical correlations between the property of a polymer and a number of variables, which are either physical properties themselves or descriptors, which hold information about a polymer in a more abstract way. The simplest QSPR models are usually linear regression-type models but complex neural networks and numerous other machine-learning techniques have also been used. 

Flexible Moulded Foam Machine Physical Property Data... 

Bioassays have been likened to analytical machines insofar as pharmacologists use them to assign biological properties to compounds in the same way a chemist measures the physical-chemical properties of molecules. If the fundamental role of the medicinal chemist is to optimize the pharmaceutical properties of so-called lead compounds by structural modification, then the role of the pharmacologist in the drug discovery process is to select, develop, and apply bioassays to provide relevant robust data that inform the medicinal chemist of the impact of the modifications he makes. 

Carbon dioxide gas was used as a physical blowing agent to produce medium density polypropylene foam sheets using a single screw extruder. The mechanical properties of the foam were similar in the machine direction and in the transverse direction. Abetter surface finish and a lower density was produced by using a commercial wrapping film as a cap layer. The process conditions and the die design data are presented and an attempt made to relate them to the product characteristics. 4 refs. 

There has been increased effort in recent years to pin down carbon sources in existing machines i.e., to understand and (possibly) influence material transport toward the divertor and, most important, to elucidate the transport mechanisms of carbon inside the divertor and from the divertor volume towards remote areas or gaps. However, there are still large uncertainties, and further work is needed. Material data uncertainties with carbon include the possible flux dependence, if any, of carbon chemical sputtering, very low energy but non-thermal ( 1-3 eV) hydrocarbon reflection coefficients, and overall properties of redeposited materials [33]. The tools to compare results between different devices are not clearly established and the underlying physics of the transport of the eroded carbon in the SOL by flows and drifts... 

Data will be presented to show that the constant strain rate method of testing can give equally precise results with a very substantial saving in lime and physical effort. Eor flexurid strength, nail pull resistance, and core hardness there is a simple linear correlation between the results with the two machines. The ctmsiani strain rale machine can more accurately determine the maximum load causing failure than the constant stress rate machine. Correlation between the results of tests on either machine shows that the core hardness and nail pull resistance tests tend lo duplicate information on core properties. 

Hard materials are used as thin hard coatings of some microns thickness for wear protection of tools and machine parts because of their high abrasive wear resistance. For the selection of the coating material the physical, mechanical, and technological properites of these coatings, required by the application, are decisive. The following data collection presents fundamental and available material properties for approximately 130 hard materials as a result of a literature search on carbides, nitrides, borides, silicides, and oxides. 

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