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11.
Sondes Mechri Khelifa Bouacem Taha-Bilel Chalbi Marwa Khaled Fawzi Allala Amel Bouanane-Darenfed Hocine Hacene Bassem Jaouadi 《Journal of surfactants and detergents》2022,25(4):487-504
The ability of microorganisms to grow at high temperature, alkaline pH, and high salinity makes them an attractive target for enzyme-production with several industrial applications. One strain TN-X30 has been selected as protease producer and identified as Streptomyces mutabilis after a phenotypic and molecular study. Its production of protease was improved using Taguchi L27 design. The strategy was carried out to identify the optimum levels and the interaction of the screened factors. Following this step, maximum protease activity (10,895 U/ml) was achieved after 6-days of incubation. The TN-X30 protease activity had an optimum of pH and temperature of 10 and 65°C, respectively. Thermodynamic parameters at 60°C were enthalpy 14.26 kJ/mol, entropy −220 J/mol/K, and Gibbs free energy 90.53 kJ/mol. TN-X30 protease production displayed a 16-fold increase reaching 175,000 U/ml in a 100-L fermentor. Furthermore, the lyophilization in presence of sorbitol enhanced the stability of the TN-X30 protease which remained active at 75% after 24-months of storage. The lyophilized TN-X30 protease exhibited exceptional stability indexes in presence of some known commercialized detergent components as NEODOL® 25-7, Dehydol® LT 7, Na2 CMC, Galaxy LAS, Galaxy LES 70, Galaxy 110, Galaxy CAPB Plus, and Sulfacid K. The lyophilized enzyme also displayed high stability with respect to both solid and liquid detergents. Finally, TN-X30 protease exhibited remarkable destaining of blood, egg, and chocolate stained cloth pieces. These findings may promote TN-X30 protease for use as bioadditive in detergent formulation, thereby reducing environmental chemical threat. 相似文献
12.
Semia Baklouti Amel Kamoun Raoudha Ellouze‐Ghorbel Semia Chaabouni 《International Journal of Food Science & Technology》2013,48(7):1519-1525
The resistance‐in‐series model was used to analyse flux behaviour, which involved the resistances of membrane itself, the fouling and solute concentration polarisation. Response surface methodology was used to establish the relationships between operating parameters and ultrafiltration (UF) efficiency and thus to determine optimal conditions. Experiments were performed according to Box–Behnken design by changing the levels of three parameters, namely transmembrane pressure, feed flow rate and temperature. The fitted mathematical models allowed us to plot isoresponse curves. It was shown that the resistance due to solute concentration polarisation (Rcp) dominated the flux decline (40–74%). The fouling resistance (Rf) varied from 12 to 46%. To optimise simultaneously the three responses studied (Rf, Rcp and permeate limit flux), we applied the desirability function approach which allowed us to determine the best acceptable compromise. The selected UF conditions of the compromise were as follows: three bars, 0.95 L min?1 and 30 °C. Optimal values of Rf, Rcp and permeate limit flux were equal to 18%, 72% and 19 L h?1 m?2, respectively. 相似文献
13.
Amel Priest 《Rocks & Minerals》2013,88(3-4):173-197
14.
Youcef Bouhadda Amel Rabehi Youcef Boudouma Noureddine Fenineche Samia Drablia Hocine Meradji 《International Journal of Hydrogen Energy》2009
The ZrNiH3 compound is a good candidate for hydrogen storage. In this work we used the first-principles calculation to study this compound. The crystal structures, the electronic properties and the optimization of the internal parameters are treated by the FP-LAPW method implanted in the WIEN2K code. The enthalpies of the dehydrogenation of the ZrNiH3 compound are calculated. We found that the enthalpy is about −42.89 kJ/mol H, greater but similar to the experimental value of −34.3 kJ/mol H. Potential reasons for this discrepancy are discussed. 相似文献
15.
Amel Zafour Hadj-Ziane 《Desalination》2004,170(1):91-97
Four microemulsions were formulated as model systems for “cutting oil” consisting of water, mineral oil as an organic component, sodium dodecylsulfate or dodiflood as a surfactant, and alcohol as a co-surfactant. Their stability was ascertained by a rheology study and their oil/water nature was confirmed by physico-chemical tests. Their breakdown with the pervaporation technique using a polydimethylsiloxane membrane ensured the preferential removal of oil from other components. The enrichment factor and the flux rate were examined as functions of time and temperature. The optimal temperature and time were found to be 40°C and 4 h, respectively. 相似文献
16.
Increasing concentration of sulfuryl chloride during the photosulfochlorination reaction under visible light shows that under
these conditions n-alkanes react at high conversion rates instead of the conversion rate of 15% reported in the literature. This photosulfochlorination
with sulfuryl chloride leads to better and more interesting results compared with those of photosulfochlorination by gas mixture.
Indeed, nearly total conversion of n-alkanes, specifically n-heptane, n-dodecane, n-tetradecane, and n-hexadecane, occurred in pure phase, with a quantitative global yield, a sulfochlorination-to-chlorination molar ratio of
about 1, and a relative reactivity of secondary to primary hydrogen of about 2.5, at a reaction temperature of 30°C and a
reaction time of 120 min, using 2×10−2 mol L−1 of pyridine. Under these conditions, no polysulfochlorinated compounds are detected. These results are further improved using
chlorobenzene as the solvent, instead of benzene. Indeed, the sulfochlorination of n-heptane at a conversion rate of 80% in the presence of chlorobenzene leads also to a quantitative reaction yield, a higher
RSO2Cl/RCl molar ratio, and, as expected, a high selectivity of secondary over primary hydrogen. Under these conditions, sulfochlorination
of long-chain n-alkanes leads to the highest RSO2Cl/RCl molar ratio for n-dodecane, n-tetradecane, and n-hexadecane belonging to detergent range, and the value of the molar ratio for these is between 1.45 and 1.7. The isomeric
distribution of sulfochlorinated compounds obtained during sulfochlorination in the presence of solvent resembles that of
secondary alkanesul-fonates produced by sulfoxidation reaction, whereas that obtained in pure phase has a similar conversion
rate, is rich in primary isomer, and thus is different from that of classic radical reactions such as photochlorination or
photosulfochlorination with gas mixture. 相似文献
17.
A. S. Zubchenko M. M. Koloskov A. V. Amel’yanchik T. B. Shirolapova 《Metal Science and Heat Treatment》2006,48(7-8):317-322
An algorithm and software for analyzing and optimizing the processes of austenization and formation of martensitic and bainitic
structural zones in the hardened layer due to continuous serial heating and hardening with the use of sectioned power current
inductors are developed. The suggested computer technology based on criteria of the fullness of occurrence of processes of
homogeneous austenization and on thermokinetic diagrams of austenitic transformation makes it possible to compute the heating
power, the velocity of motion of the inductor, the number of passes in heating, the number of sections in the inductor, their
sizes and position, and the width of the cooling zone required for ensuring the specified thickness and structure in the hardened
layer.
__________
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 43–48, July, 2006. 相似文献
18.
Amel Khrouf Sami Boufi Rachid El Gharbi Naceur M. Belgacem Alessandro Gandini 《Polymer Bulletin》1996,37(5):589-596
Summary This paper describes a preliminary set of results concerning novel systems in which the synthesis of furanic polyesters was conducted according to a transesterification procedure. Regular linear macromolecular structures were thus obtained with molecular weights well above those previously reported for similar polyesters prepared by more conventional routes. 相似文献
19.
Freddy?DuitamaEmail author Bruno?Defude Amel?Bouzeghoub Claire?Lecocq 《Multimedia Tools and Applications》2005,25(3):377-390
This approach proposes the creation and management of adaptive learning systems by combining component technology, semantic metadata, and adaptation rules. A component model allows interaction among components that share consistent assumptions about what each provides and each requires of the other. It allows indexing, using, reusing, and coupling of components in different contexts powering adaptation. Our claim is that semantic metadata are required to allow a real reusing and assembling of educational component. Finally, a rule language is used to define strategies to rewrite user query and user model. The former allows searching components developing concepts not appearing in the user query but related with user goals, whereas the last allow inferring user knowledge that is not explicit in user model.John Freddy Duitama received his M.Sc. degree in system engineering from the University of Antioquia -Colombia (South America). He is currently a doctoral candidate in the GET – Institut National des Télécommunications, Evry France. This work is sponsored by the University of Antioquia, where he is assistant professor.His research interest includes semantic web and web-based learning systems, educational metadata and learning objects.Bruno Defude received his Ph.D. in Computer Science from the University of Grenoble (I.N.P.G) in 1986. He is currently Professor in the Department of Computer Science at the GET - Institut National des Télécommunications, Evry France where he leads the SIMBAD project (Semantic Interoperability for MoBile and ADaptive applications).His major field of research interest is databases and semantic web, specifically personalized data access, adaptive systems, metadata, interoperability and semantic Peer-to-peer systems with elearning as a privileged application area.He is a member of ACM SIGMOD.Amel Bouzeghoub received a degree of Ph.D. in Computer Sciences at Pierre et Marie Curie University, France.In 2000, she joined the Computer Sciences Department of GET-INT (Institut National des Telecommunications) at Evry (France) as an associate professor.Her research interests include topics related to Web-based Learning Systems, Semantic Metadata for learning resources, Adaptive Learning Systems and Intelligent Tutoring Systems.Claire Lecocq received an Engineer Degree and a Ph.D. in Computer Sciences respectively in 1994 and 1999. In 1997, she joined the Computer Sciences Department at GET-INT (Institut National des Télécommunications) of Evry, France, as an associate professor. Her first research interests included spatial databases and visual query languages. She is now working on adaptive learning systems, particularly on semantic metadata and user models. 相似文献
20.
This paper focuses on the implementation of Multi-Criteria Decision Making (MCDM) methods to evaluate the workforce competence in apparel industry. In this study, the Analytic Hierarchy Process (AHP), the Weighted Sum Model (WSM) and the Weighted Product Model (WPM) are suggested to solve workforce selection problem. The use of these methods is expected to help choose the best operator among several alternatives. Based on three criteria, each worker is evaluated in each executed operation. The criteria are a Quality Index ‘QI’, an Activity ‘A’ and an Attendance Rate ‘AR’. Thanks to the MCDM methods, scores allowing an objective classification of operators are obtained. Experimental results on AHP, WSM and WPM methods show the same decisions with the same workers’ classification from the best to the worst alternative. The resulting database contributes to the line balancing optimization by choosing for each operation, and as far as possible, the most competent operator. 相似文献