Set Of Process Variables Research Articles

Processing maps for optimizing gas atomization and spray deposition

A validated mathematical model was used to generate processing maps for producing near-net shapes of high-performance products by gas atomization and spray deposition. The processing maps are useful to optimize and control the manufacturing process on the shop floor for producing quality products. The number of trial runs and cost of production can be significantly reduced with the help of processing maps. Using a dispersion-strengthened aluminum alloy as an example, this article examines how processing maps can be used to choose a set of process variables for producing the end product of desired quality.

Optimization of a process of continuous enzyme purification by surface response analysis

The methodology considered in this work for the optimization of an enzyme purification process by continuous adsorption recycle extraction (CARE) makes use of surface response analysis. The advantage of such approach is mainly concerned with the fact that it does not require the use of reduced models. In this way, through a detailed model of the system, it is possible to account for operational conditions, the whole set of process variables and design detail in the analysis. With this information, the main effects of each variable (among a group of seven) have been quantified, so that high yield can be achieved handling the enzyme feed concentration, the adsorption stage feed flow rate, the bed porosity and the recycling flow rate. For the productivity, beyond the enzyme feed concentration and the adsorption stage feed flow rate, the volumes of both adsorption and desorption are important. Through a two-star factorial procedure, it was possible to obtain mathematical relationships for the yield and productivity which are very useful in defining operating policy and design details in the search for optimal conditions.

Steady state modelling of a hollow fiber enzymatic reactor

Biotechnology and BioengineeringVolume 30, Issue 3 p. 458-461 Communication To The EditorFree Access Steady state modelling of a hollow fiber enzymatic reactor C. Fabiani, C. Fabiani E.N.E.A., Dipartimento TIB, Divisione Chimica, sp. Anguillarese km 1.300, 00060-Roma, ItalySearch for more papers by this authorG. Giubileo, G. Giubileo E.N.E.A., Dipartimento TIB, Divisione Chimica, sp. Anguillarese km 1.300, 00060-Roma, ItalySearch for more papers by this authorM. Pizzichini, M. Pizzichini E.N.E.A., Dipartimento TIB, Divisione Chimica, sp. Anguillarese km 1.300, 00060-Roma, ItalySearch for more papers by this authorV. Violante, V. Violante E.N.E.A., Dipartimento TIB, Divisione Chimica, sp. Anguillarese km 1.300, 00060-Roma, ItalySearch for more papers by this author C. Fabiani, C. Fabiani E.N.E.A., Dipartimento TIB, Divisione Chimica, sp. Anguillarese km 1.300, 00060-Roma, ItalySearch for more papers by this authorG. Giubileo, G. Giubileo E.N.E.A., Dipartimento TIB, Divisione Chimica, sp. Anguillarese km 1.300, 00060-Roma, ItalySearch for more papers by this authorM. Pizzichini, M. Pizzichini E.N.E.A., Dipartimento TIB, Divisione Chimica, sp. Anguillarese km 1.300, 00060-Roma, ItalySearch for more papers by this authorV. Violante, V. Violante E.N.E.A., Dipartimento TIB, Divisione Chimica, sp. Anguillarese km 1.300, 00060-Roma, ItalySearch for more papers by this author First published: 20 August 1987 https://doi.org/10.1002/bit.260300317Citations: 10AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Citing Literature Volume30, Issue320 August 1987Pages 458-461 ReferencesRelatedInformation

12. Controlled deposition of protective aluminum films on aircraft steels

A laboratory system for controlled vacuum deposition of aluminum films was assembled in order to conduct anodic protection coating experiments on CrMo aircraft steels. High deposition rates were achieved employing a high-power electron-beam gun for source evaporation. A special substrate-heater was constructed for controlled variation of coating temperature. Process variables and their effect on the relevant properties of the films, mainly adhesion and corrosion resistances, were studied. It was found that these properties improved with increasing substrates temperature in the range of 200–450°C. Optimum conditions were obtained for the following set of process variables: temperature = 400–450°C. Films of about 5 microm thickness were obtained conditions and their structure was studied using scanning electron microscope and X-ray diffraction methods. It was found that the films had a (111) preferred orientation evidenced by 0.5–1.0 microm crystallites, with the larger sizes corresponding to the higher temperatures.