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1.
RAFAEL DÍAZ-SOBAC ALMA VAZQUEZ LUNA CÉSAR I. BERISTAIN JAVIER DE LA CRUZ HUGO SERGIO GARCIA 《Journal of Food Processing and Preservation》1996,20(3):191-202
A coating emulsion was prepared using maltodextrins, carboxymethylcellulose, propileneglycol and a mixture of s orbit an fatty acid esters with an HLB of 6. The emulsion was sprayed on fully mature, unripened manila mangoes, which were the stored at 15 and 25C and 80–85% R.H. At 25C it was observed that rate CO2 production increased and lost in control fruits after 12 days of storage. Coated mangoes kept their rate CO2 production and suffered only 8% weight loss after 21 days of storage. After storage, the coating was washed out and fruits were allowed to ripen naturally, which occurred in 3–4 days. The results obtained from this study indicate that application of the hydrophobic coating extended the postharvest storage of mangoes for at least 20 days more than uncoated fruits. 相似文献
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In recent years, high enrollment has greatly increased the counseling loads of academic advisors at American colleges and universities. Expert systems can assist academic counselors by solving a relatively easy class of problems which deal with the most encountered cases. In this paper, a prototype expert system, CLASS COUNSELOR, is presented. CLASS COUNSELOR recommends a set of courses after an interactive session with the student. It handles the upper division courses of the undergraduate program in the Department of Electrical Engineering, University of Florida. The program runs on IBM-AT personal computers and compatibles. 相似文献
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RAFAEL AVILS M. B. GOIZALDE AJURIA JAVIER VALLEJO ALFONSO HERNNDEZ 《International journal for numerical methods in engineering》1997,40(8):1505-1524
The present paper describes a procedure for the optimal dimensional synthesis of mechanisms which is based on the solution of non-linear position problems. Planar mechanisms are modelled very easily by means of finite elements of bi-hinged rod type. The judicious choice of constraint conditions makes possible the solution of classical position problems: initial, finite-displacement, deformed and static-equilibrium problems, as well as the main types of dimensional synthesis: path generation, functions, rigid body guidance, mixed, and multiple. A single synthesis error function applies to all these types, and moreover is general since it is valid for mechanisms of any configuration. This function is based on the idea that the best mechanism for the given synthesis conditions is the one that least needs to be deformed when it is obliged to satisfy them exactly, to which end the elastic deformation of the elements is permitted. © 1997 by John Wiley & Sons, Ltd. 相似文献
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LEOPOLDO PREZ FRANCISCO J. PREZ JAVIER CEREZO JAVIER CATEDIANO 《International Journal of Adaptive Control and Signal Processing》1997,11(4):367-378
This paper presents the summary application of an adaptive predictive control system (APCS) to the control and optimization of the processes in a coal power station. The results obtained, corresponding to a Research and Development project at the Pasajes de San Juan power station, which belongs to the company Iberdrola, demonstrate the suitability of the APCS application in this field as well as the important benefits that may be derived from it. © 1997 John Wiley & Sons, Ltd. 相似文献
10.
Metastability of Tetragonal Zirconia Powders 总被引:1,自引:0,他引:1
MARIA ISABEL OSENDI JOSE S. MOYA CARLOS J. SERNA JAVIER SORIA 《Journal of the American Ceramic Society》1985,68(3):135-139
The formation of metastable t -ZrO2 by thermal treatment was studied in a systematic way on two different samples: a gel (G) and zirconyl acetate (A). The results show that initially nucle-ation of t -ZrO2 is favored by creation of anionic vacancies with trapped electrons. At higher temperatures the electronic defects disappear, the crystallites grow, and the m -phase can nucleate. This evolution is observed perfectly on sample A because of its special morphological characteristics. 相似文献