Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Technological basis

Opening the mold and removing items is considerably easier with polymers showing a high shrinkage (5 to 15%). [Pg.139]

In rotational molding of anionically polymerized E-caprolactam one can produce vessels up to 10 m3, fuel tanks of various shapes, and other seamless large-sized items. As a rule, the mold rotates with different speeds about the two axes in such a way that the reactive mixture flows to the mold walls with minimal net centrifugal force. When molding long items, a greater difference in rotation speeds is required than when molding round items. [Pg.139]

Although the polymerization of e-caprolactam was described above, there is no difference in principle from the process flow sheets for centrifugal molding of items from other polymers and oligomers. Nevertheless, in most cases, the high temperatures used in lactam polymerization are not required, and the flow sheet as a whole is simplified. In industrial practice, poly(methyl methacrylate) pipes,172 and sheets of polyurethanes and unsaturated polyesters are obtained by centrifugal casting. [Pg.139]

The selection of optimum conditions for rotary molding requires extensive experimental investigations of the various processing regimes. Recently, another way has been developed, i.e., simulation of the flow of a liquid system polymerized in a rotary (rotating) mold.178 [Pg.139]


There are several problems with these standards for older coal-fired plants that limit a sensible NO,-reduction policy. First, they are relatively lenient. Because they require only that low-NO, burners be used at coal-fired plants, relatively inexpensive NO,-reduction technologies are not being used, because the plants already meet the minimum standards. Second, standards are established on a technology-by-technology basis, and have resulted in more lenient requirements for dirtier technologies. This has created little or no incentive to switch to cleaner processes in the past decade. Thirdly, these standards are input-based, which means they provide no incentive for efficiency within any technology category. [Pg.353]

The availability and prices of sensor components (fibres as well as sources and photodetectors) can be considered key parameters for the sensor design. With some simplification it can be stated the further from the VIS-NIR spectral region, where the technological basis is anchored in large-scale production for telecommunications, the higher the prices of all components. However, valuable results have been obtained in the IR region21 (see chapter 7). [Pg.65]

Although the technological basis of all fluorine-containing plastics and most elastomers continues to be the free radical polymerization of fluoroolefins, which themselves are based on the vastly greater fluorocarbon refrigerant industry, important advances have been made in the past two decades These include primarily the production of polymers that are more resistant to degradation by heat, oxidation, bases, and solvents, as well as polymers that are more easily processable, that is, able to be converted mto their final forms for use, whether by thermoplastic or thermoset processes [1,2,3,4]... [Pg.1101]

G. MacLeod, The scientific and technological basis of meat flavours, in Developments in Food Flavours, G. G. Birch and M. G. Lindley (eds), Elsevier Applied Science, London, 1986, 191-223. [Pg.185]

Economics Techno-economic comparison of CrystPX to conventional technologies basis 90% PX feed purity, 400,000 tpy of 99.8 wt% PX. [Pg.138]

Determine industrial and technological basis for implementation of works on cutting of hulls of NPSS and MVs and making up of RC units containing reactor equipment ... [Pg.122]

Determine the contents of works on developing industrial and technological basis and identily participants of works and... [Pg.123]

This work has been supported by the Russian Foundation for Basic Research grant 08-02-99042-r-ofi, a grant of the Program "Quantum Nanostructures" of the Presidium of RAS and a grant "Quantum bit on base of micro- and nanostructures with metal conductivity" of the Program "Technology Basis of New Computing Methods" of ITCS department of RAS. [Pg.586]

The aim of HTS and UHTS is cost-effectiveness and speed of compound scanning. Hence, the robotics system not only has to deliver fast and accurate liquid samples into the wells, it has to be miniaturized to conserve the volumes required of the valuable samples and expensive assay reagents. For the 1536 wells, the liquids being dispensed are in the nanoliter (10-9 L) to picoliter (Kh12 L) range. The ink jet technology provided the technological basis for liquid dispensation in HTS. [Pg.49]

Later, development by Riedl and Pfleiderer with BASF led to the replacement of hydrazobenzenes with alkylated anthrahydroquinones [5]. The first plants employing the Riedl-Pfleiderer process - the technological basis for all modern AO processes [6] - were developed by BASF between 1935 and 1945 but dismantled at the conclusion of World War II. [Pg.222]

Waterborne paints provided the technological basis for electrodeposition paints (Section 3.8), in which negatively charged paint particles (anaphoresis, industrial introduction at the beginning of the 1960s), or positively charged paint particles (cataphoresis, industrial introduction at the end of the 1970s) are deposited from aqueous solution onto metallic substrates by application of an electrical field [3.40]. [Pg.109]

The process of A SW verification and validation assessment is one of the essential parts of NPP I C expert analysis and licensing. For the broad number of systems, particularly computer-based control systems, the problems of A SW verification and validation assessment is desirable to consider simultaneously. This is a reason for theoretical and technological basis improvement for developing and realization of A SW verification and validation assessment process. [Pg.109]

RF-based technologies provide the technological basis for autonomous control, time, location, and environment sensing. [Pg.70]


See other pages where Technological basis is mentioned: [Pg.196]    [Pg.271]    [Pg.60]    [Pg.386]    [Pg.137]    [Pg.411]    [Pg.258]    [Pg.222]    [Pg.222]    [Pg.345]    [Pg.503]    [Pg.102]    [Pg.393]    [Pg.152]    [Pg.152]    [Pg.152]    [Pg.303]    [Pg.369]    [Pg.364]    [Pg.10]    [Pg.29]    [Pg.185]    [Pg.94]    [Pg.553]    [Pg.554]    [Pg.555]    [Pg.157]    [Pg.344]    [Pg.298]    [Pg.1113]    [Pg.45]    [Pg.873]    [Pg.650]   
See also in sourсe #XX -- [ Pg.14 , Pg.43 , Pg.60 , Pg.74 , Pg.82 ]




SEARCH



Silicon-processing technology basis

© 2024 chempedia.info