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Octávio P. Dias Isabel C. Teixeira J. Paulo Teixeira 《Journal of Electronic Testing》1999,14(1-2):149-158
The purpose of this paper is to present a novel methodology for assessing the quality of architecture solutions of hw/sw systems, with particular emphasis on testability. Criteria and metrics for quality assessment are proposed and used to assist the design team in selecting a best-fitted architecture that satisfies not only functional requirements, but also test requirements. The methodology makes use of object-oriented modeling techniques. Near-optimum clustering of methods and attributes into objects is carried out, in such a way that objects with moderate complexity, low coupling and high functional autonomy, result. The main features of the methodology are ascertained through a case study. 相似文献
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Alcínia Z. Sampaio Miguel M. Ferreira Daniel P. Rosário Octávio P. Martins 《Automation in Construction》2010,19(7):819-828
Where educational validity is concerned, a school of engineering can reasonably be expected to constantly update computational resources in frequent use in the professions. Virtual reality (VR) technology could be applied as a complement to three-dimensional (3D) modelling, leading to better communication whether in vocational training, in education or in professional practice. Techniques of 3D modelling and VR were applied to the development of models related to the construction process. The 3D models created to support rehabilitation design emerge as an important tool for the monitoring of anomalies in structures and to assist decisions based on the visual analyses of alternative solutions. The VR model created to help the management of lighting systems in buildings allows the visual and interactive transmission of information related to the physical behaviour of the elements, defined as a function of the time variable. Didactic interactive models showing construction works were also developed. These applications allow the visual simulation of the physical progression of each type of work and also assist in the study of the necessary equipment needed and how it functions on site. The introduction of CAD and VR techniques in school is helpful to students in order to prepare them to consider these technologies as important supports, later in their professional practice. 相似文献
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Lindomar A. Lerin Aline Richetti Rogério Dallago Helen Treichel Marcio A. Mazutti J. Vladimir Oliveira Octávio A. C. Antunes Enrique G. Oestreicher Débora de Oliveira 《Food and Bioprocess Technology》2012,5(3):1068-1076
This work is focused on the optimization of reaction parameters for the synthesis of ascorbyl palmitate catalyzed by Candida antarctica lipase in different organic solvents. The sequential strategy of experimental designs proved to be useful in maximizing the
conditions for product conversion in tert-butanol system using Novozym 435 as catalyst. The optimum production were achieved
at ascorbic acid to palmitic acid mole ratio of 1:9, stirring rate of 150 rpm, 70 °C, enzyme concentration of 5 wt.% at 17 h
of reaction, resulting in an ascorbyl palmitate conversion of about 67%. Reaction kinetics for ascorbyl palmitate production
showed that very satisfactory reaction conversions (∼56%) could be achieved in short reaction times (6 h). The kinetic empirical
model proposed showed ability to satisfactory represents and predict the experimental data. 相似文献
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A phospholipase A2 activity associated with the microsomal fraction of rabbit lung homogenates was studied. The enzyme showed specificity for
thesn
−2 ester bond of phosphatidylcholine, had an alkaline pH optimum and required Ca2+ for activity. Other divalent cations were unable to support hydrolysis. In the absence of detergents, exogenous phosphatidylethanolamine
was deacylated at a rate sevenfold higher than phosphatidylcholine. The activity toward both substrates could be enhanced
by sodium deoxycholate or, more effectively, by sodium taurodeoxycholate. Phosphatidylethanolamine required higher detergent/phospholipid
molar ratios than phosphatidylcholine. Under these conditions, the preference for the former substrate over the latter was
nearly abolished. The zwitterionic detergent 3-[(3-cholamidopropyl) dimethylammonio]-1-propanesulfonate (CHAPS) and the nonionic
detergent Triton X-100 were either ineffective (phosphatidylcholine) or inhibitory (phosphatidylethanolamine). Addition of
KCl produced opposite effects on the activity depending on the bile salt used to disperse the substrate. The phospholipase
A2 activity was inhibited byp-bromophenacyl bromide but remained unaffected after treatment with diisopropylfluorophosphate or NaF. N-Ethylmaleimide, but
not other thiol reagents, partially inhibited the activity.
Presented in part at the 29th CFBS meeting, Guelph, Canada, June 1986, and at the symposium “25 Years Lipids and Biomembranes,”
Utrecht, The Netherlands, June 1986. 相似文献
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