50 research outputs found

    The Effect of organizational culture on the application of total quality management Case study of the Algerian Foundation for Plastic Rolling, National Complex of Plastic and Rubber

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    هدفت هذه الدراسة إلى معرفة أثر الثقافة التنظيمية على تطبيق إدارة الجودة الشاملة في مؤسسة  الدلفنة البلاستيكية، وبغية تحقيق ذلك تم تصميم استمارة وتوزيعها على عينة قوامها  86 مستجوبا من جميع المستويات الادارية تم اختيارها بشكل عشوائي، وقد تم الاعتماد على تحليل الانحدار الخطي المتعدد لاختبار فرضيات البحث، وتوصلت الدراسة  إلى وجود أثر ذو دلالة احصائية للثقافة التنظيمية على تطبيق إدارة الجودة الشاملة، حيث أظهرت نتائج الدراسة أن للثقافة التنظيمية أثر ذو دلالة احصائية على كل من التركيز على الزبون، التركيز على العمليات وتحسينها، المشاركة، التزام الادارة العليا وذلك من خلال كل من قيم الثقافة التنظيمية المتمثلة في: خدمة العميل، اتقان العمل، العمل الجماعي، الانتماء وتنمية وتطوير الذات.This study aimed to know the impact of organizational culture on the application of TQM in Calplast company of rolling plastic, in order to achieve this we use a questionnaire which was distributed to a sample included 86 respondents from all managerial level which were randomly selected, it has been relying on multiple linear regression analysis for testing hypotheses of research. The study concluded  that there is significant impact of organizational culture on the application of TQM, the results of study showed that the organizational culture has a significant impact on  focus on the customer, focus on processes and improve, participation, the top management commitment, so through all of the organizational culture values

    Phytochemical characterization, biological screening and corrosion inhibition of mild steel from extracts of Juniperus oxycedrus L.

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    The aim of this research was to study the effect of solvent polarity and extraction technique of phenolic compounds from Juniperus oxycedrus L. on antioxidant and antibacterial activity. Also, this paper aims to evaluate the anti-corrosive effect of aqueous extracts. In order to evaluate the effect of solvents on the bioactive compound’s extraction efficiency, the samples were prepared with different extraction procedures. The methanolic and ethanolic extracts were prepared by using Soxhlet and maceration extraction and aqueous extracts were obtained by decoction and infusion methods. Moreover, six fractions (petroleum ether, chloroform, ethyl acetate, 1-butanol and aqueous) were prepared by partition of ethanolic extract. All the extracts were subjected to preliminary phytochemical screening; the results show the presence of flavonoids, tannins, alkaloids, triterpenes and steroids. The study of the effect of extraction methods revealed that the decoction is the most suitable for the extraction of phenolic compounds. Moreover, depending on the solvent studied, it was noted that the ethanol showed a high level of flavonoids and the high antioxidant capacity. The extracts were also tested for their antibacterial activity in vitro against two bacterial strains (Escherichia coli and Staphylococcus aureus) using the disc diffusion method. The results of antibacterial showed that the highest activity was attributed to ethanolic extract with a maximum zone of inhibition of 13 mm against Staphylococcus aureus. The corrosion inhibition effect of the aqueous extracts in mild steel in 1 M HCl solution showed that the extracts inhibit effectively corrosion of mild steel

    Polymersomes stimulables : Thermosensibilité et biodégradabilité

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    Les polymersomes sont des vésicules dont la membrane est formée d'une bicouche de polymères amphiphiles. Les polymersomes dits stimulables sont particulièrement étudiés de nos jours pour leurs propriétés de relargage contrôlé. Ces propriétés peuvent être ajustées simplement en variant la nature chimique du polymère constituant la membrane vésiculaire.Dans le cadre de ce travail de thèse, nous nous sommes intéressés à des polymersomes originaux, assemblés à partir de copolymères cristaux liquides. Ces copolymères comprennent un bloc cristal liquide hydrophobe et un bloc poly(ethylene glycol) (PEG) hydrophile. Les cristaux liquides sont des entités particulièrement intéressantes pour leur capacité d'auto-assemblage et leurs réponses aux stimuli physiques tels la température, les champs magnétiques et la lumière.Plusieurs types de polymersomes basés sur des copolymères cristaux liquides ont été étudiés en température et en champ magnétique. L'effet thermique est drastique, perturbant totalement la morphologie vésiculaire au dessus d’une température critique. Différents hybrides de nanoparticules d’oxyde de fer et de polymères cristaux liquides ont aussi été examinés dans le but d’induire un chauffage local par hyperthermie magnétique.Enfin, nous décrivons la synthèse de copolymères amphiphiles cristaux liquides biodégradables incluant des motifs cholesterol. L'auto-assemblage de ces molécules en milieu aqueux a permis la formation de nanoparticules bien définies et prometteuses pour des applications de relargage en milieu biologique.Polymersomes are vesicles whose bilayer is made of amphiphilic polymers. Stimuli responsive polymersomes are nowadays increasingly studied for their encapsulation properties and ability to release their content upon stimulation. Such smart polymersomes can be designed by using appropriate responsive building blocks.In the present study, we were interested in studying thermoresponsive and biodegradable polymersomes made of liquid crystalline (LC) amphiphilic copolymers. LC polymers represent here the hydrophobic block while the hydrophilic block consists in poly(ethylene glycol) (PEG). LC polymers are very good self-assocative building blocks and are intrinsically responsive to physical stimuli such as temperature, light and magnetic fields.We report here the investigation of temperature effects on liquid crystalline and non liquid crystalline polymersomes. Temperature was shown to alter dramatically LC polymersomes morphology above a critical thermal threshold. Hybrid colloids made of iron oxide nanoparticles and amphiphilic liquid crystalline copolymers were also studied with the aim of applying a magnetically induced local heating.Finally, we designed biodegradable liquid crystalline copolymers based on cholesterol. Their self assembly in water gave access to very well defined nanoparticles that could be promising for bioapplications

    Performance analysis of AS-SOFC fuel cell combining single and sinusoidal flow field: numerical study

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    The performance of a solid oxide fuel cell (SOFC) was examined using 3D computational fluid dynamics to model mass and heat flows inside the channels. In the present investigation, a SOFC fuel cell with a new flow field based on a sinusoidal flow has been studied. The latter was tested and compared with a single flow using ANSYS FLUENT. The obtained results showed that at a given operating voltage, the maximum power for the sinusoidal and the single flow fields were 1.43 and 1.35 W/cm2, respectively. By taking in addition, into account the concentration, activation and Ohmic losses; it was noticed that the distribution of velocity and temperature for the sinusoidal flow led to bettered results. Furthermore, it was observed that the maximum use of H2 mass fraction consumed in sinusoidal and single flow field designs were 60% and 55% respectively. Similarly, the highest H2O mass fraction values produced for the sinusoidal and single flow designs were 42% and 34% respectively. This model was validated and confronted to previous data. The present results agree well with reported studies in literature

    Performance analysis of AS-SOFC fuel cell combining single and sinusoidal flow field: numerical study

    No full text
    The performance of a solid oxide fuel cell (SOFC) was examined using 3D computational fluid dynamics to model mass and heat flows inside the channels. In the present investigation, a SOFC fuel cell with a new flow field based on a sinusoidal flow has been studied. The latter was tested and compared with a single flow using ANSYS FLUENT. The obtained results showed that at a given operating voltage, the maximum power for the sinusoidal and the single flow fields were 1.43 and 1.35 W/cm2, respectively. By taking in addition, into account the concentration, activation and Ohmic losses; it was noticed that the distribution of velocity and temperature for the sinusoidal flow led to bettered results. Furthermore, it was observed that the maximum use of H2 mass fraction consumed in sinusoidal and single flow field designs were 60% and 55% respectively. Similarly, the highest H2O mass fraction values produced for the sinusoidal and single flow designs were 42% and 34% respectively. This model was validated and confronted to previous data. The present results agree well with reported studies in literature

    تطبيق التكنولوجيا المالية في البنوك الإسلامية دراسة حالة بنك بوبيان الإسلامي

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    التكنولوجيا المالية من الآليات التي يمكن أن تساهم في تطوير الصناعة المصرفية الإسلامية، حيث تسمح بتوفير خدمات مالية ومصرفية أكثر سرعة وكفاءة. وتساهم إلى حد كبير في تقليص تكاليف البنوك خاصة تلك المتعلقة بافتتاح فروع جديدة. يعتبر بنك بوبيان الإسلامي أحد النماذج الناجحة في تطبيق التكنولوجيا المالية فقد أثبت أن اعتماد بعض التقنيات الحديثة كالصيرفة الإلكترونية والخدمات المالية عبر: أجهزة الصراف الآلي، أجهزة نقاط البيع، الأجهزة الذكية وتطبيقات الذكاء الاصطناعي في مجال الصيرفة الإسلامية غير معيق للعمل المصرفي الإسلامي

    تطبيق التكنولوجيا المالية في البنوك الإسلامية دراسة حالة بنك بوبيان الإسلامي

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    التكنولوجيا المالية من الآليات التي يمكن أن تساهم في تطوير الصناعة المصرفية الإسلامية، حيث تسمح بتوفير خدمات مالية ومصرفية أكثر سرعة وكفاءة. وتساهم إلى حد كبير في تقليص تكاليف البنوك خاصة تلك المتعلقة بافتتاح فروع جديدة. يعتبر بنك بوبيان الإسلامي أحد النماذج الناجحة في تطبيق التكنولوجيا المالية فقد أثبت أن اعتماد بعض التقنيات الحديثة كالصيرفة الإلكترونية والخدمات المالية عبر: أجهزة الصراف الآلي، أجهزة نقاط البيع، الأجهزة الذكية وتطبيقات الذكاء الاصطناعي في مجال الصيرفة الإسلامية غير معيق للعمل المصرفي الإسلامي

    The Application of Financial Technology in Islamic banks a case study of Boubyan Islamic Bank: تطبيق التكنولوجيا المالية في البنوك الإسلامية دراسة حالة بنك بوبيان الإسلامي

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    التكنولوجيا المالية من الآليات التي يمكن أن تساهم في تطوير الصناعة المصرفية الإسلامية، حيث تسمح بتوفير خدمات مالية ومصرفية أكثر سرعة وكفاءة. وتساهم إلى حد كبير في تقليص تكاليف البنوك خاصة تلك المتعلقة بافتتاح فروع جديدة. يعتبر بنك بوبيان الإسلامي أحد النماذج الناجحة في تطبيق التكنولوجيا المالية فقد أثبت أن اعتماد بعض التقنيات الحديثة كالصيرفة الإلكترونية والخدمات المالية عبر: أجهزة الصراف الآلي، أجهزة نقاط البيع، الأجهزة الذكية وتطبيقات الذكاء الاصطناعي في مجال الصيرفة الإسلامية غير معيق للعمل المصرفي الإسلامي.Financial technology (Fintech) is one of the mechanisms that can contribute to the development of the Islamic banking industry, as it enables the provision of faster and more efficient financial and banking services. It also greatly contributes to reducing the costs of banks, in particular those linked to the opening of new branches. Boubyan Islamic Bank is considered one of the successful models in the application of fintech. He proved that the adoption of some modern technologies such as electronic banking and financial services through ATMs, POS, smart devices and applications of artificial intelligence in the field of Islamic banking does not hinder the work of the Islamic bank

    Polymersomes stimulables (Thermosensibilité et biodégradabilité)

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    Résumé confidentiel en françaisRésumé confidentiel en anglaisPARIS5-Bibliotheque electronique (751069902) / SudocSudocFranceF
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