Mediating Role of Trust Between Transformational Leadership, Knowledge Management, and Employee Innovation Among the Employees of Customs Department Dubai

Purpose:  The purpose of the study was to identify the mediating role of trust between transformational leadership, knowledge management and employee innovation among the employees of customs department Dubai United Arab Emirates. For meeting the objectives of the study and to test the framework of the study, the current study collected data from the employees of custom department of Dubai.     Theoretical framework: Employee innovation is considered as a key participant in organizational success. Leadership plays a significant role in developing employee innovation; however, it becomes successful only when the leader succeeds in developing trust among the employees.   Design/methodology/approach: The data has been collected from 371 employees and structural equation modelling has been applied to test the relationships and mediation analysis.   Findings: The findings revealed that both leadership and knowledge management have a significant impact over employee innovation. Likewise, trust significantly mediate the relationship between transformational leadership, knowledge management and employee innovation.   Research, Practical & Social implications:  The research opens the horizons for several other studies to explore other influencing variables for promoting employee innovation   Originality/value: Provide a more nuanced and integrated perspective on how leadership and knowledge management affect trust and, eventually, employee innovation by evaluating them together, even though our examination of existing studies reveals that they were evaluated independently so far

Performance Improvement of the Parabolic Trough Solar Collector Using Different Types of Fluids with Numerical Simulation

المركزات الشمسية وسيلة مهمة لأستخدام طاقة الشمس. هنالك عدة انواع من المركزات الشمسية. في العمل الحالي محاولة تجريبية لتحسين الاداء الحراري للجامع الشمسي ذو القطع المكافىء بأستخدام ثلاثة موائع مختلفة (ماء، ماء مقطر مع جزيئات اوكسيد النحاس النانوية، ماء مقطر مع جزيئات الالومينا النانوية) مع نسبة تركيز 0.01 %، وسرعة جريان 20 لتر/ساعة، وبدون استخدام نظام التتبع مع محاكاة رقمية. الاختبار التجريبي تم في مدينة بغداد في قسم الهندسة الكهروميكانيكية في الجامعة التكنولوجية خلال ايام شهر تشرين الاول 2017 خلال وقت النهار (9 صباحا - 15 مساءا). النتائج المحسوبة للموائع الثلاثة كما يلي: - استخدام (CuO + ماء مقطر) يزيد معدل درجات الحرارة الخارجة بنسبة 10.4% ومعدل المكاسب الحرارية زاد بنسبة 11% ومعدل الكفاءات زاد بنسبة 15.5%. - استخدام (  + ماء مقطر ) يزيد معدل درجات الحرارة الخارجة بنسبة  4% ومعدل المكاسب الحرارية زاد بنسبة 6.5 % ومعدل الكفاءات زاد بنسبة 8.2%. هذه النتائج تبين ذلك، استخدام المائع (ماء مقطر + CuO) يعطي أفضل اداء بالمقارنة مع المائعين الاخرين المستخدمين في هذا العمل.Solar concentrators are an important facility to utilize the solar energy. There are many kinds of solar concentrators. In this work  an experimental has been implemented to improve the thermal performance of Parabolic Trough Solar Collector (PTSC) using three different fluids as a working fluid (water, nanoparticles of  CuO  mixed with distilled water nanoparticles of   mixed with  distilled water) with concentration ratio 0.01% and mass flow rate 20Lt/hr without tracking system. The experimental tests have been carried out in electro-mechanical engineering department at university of technology in Baghdad city during October 2017 and daytime between (9am -15pm) hours. The obtained results for three different fluids are as follows:  - Using (CuO + distilled water) as a working fluid increases the average of the output temperatures by 10.4%,  the average of useful heat gains   increases  by 11%  and the average of the collector efficiencies increases by15%.    - Using ( +distilled water) as a working fluid increased the average of output temperatures by 4%, the average of useful heat gains is increased by 6.5% and the average of collector efficiencies is increased by 8.2%. &nbsp

إدارة التمويل ودورها في الحد من المخاطر الائتمانية في البنوك الإسلامية : دراسة وصفية على الصيرفة الإسلامية بمصرف الجمهورية طرابلس - Financial management and its role in reducing credit risk in Islamic Bank: descriptive study of Islamic Banking at Jumhouria Bank, Tripoli

موضوع الدراسة مخاطر الائتمان الناتجة عن عمليات التمويل المصرفي الإسلامي، بالدراسة على مصرف الجمهورية فرع طرابلس في جانب المعاملات الإسلامية بالمصرف. أسئلة الدراسة هي: كيف طبيعة وخصائص مخاطر الائتمان في قطاع الصيرفة الإسلامية بمصرف الجمهورية طرابلس؟ ما دور الإدارة المصرفية في الحد من مخاطر الائتمان في قطاع الصيرفة الإسلامية بمصرف الجمهورية طرابلس؟ كيف يقوم مصرف الجمهورية طرابلس بحل المعوقات في عملية إدارة الائتمان الإسلامي؟ المنهج المستخدم هو المنهج الكيفي بطرق المقابلة والملاحظة والاطلاع على الوثائق في مصرف الجمهورية فرع طرابلس وتم تركيز البحث في قطاع الصيرفة الإسلامية بالمصرف. تم التوصل إلى النتائج التالية : تتكامل وظيفية إدارة الائتمان التي ترعى التمويل وإدارة المخاطر في تحديد وتشخيص المخاطر ومصدرها ومعرفة طريقة معالجتها، وهي مخاطر متنوعة ومتداخلة مع بعضها البعض، وتتلخص في عجز العميل عن السداد ومخاطر التورق ومخاطر التركيز على منتج واحد، ويتمحور دور إدارة التمويل في الحد من مخاطر الائتمان في مصرف الجمهورية، من خلال وضع أليات شرعية كدراسة وضع العميل، وأخذ الضمانات الكافية، وتكوين مخصص واحتياطي للمخاطر الائتمانية، وفي حالة إخلال العميل بالالتزامات يتم التواصل معه، وفي حالة ثبت عليه التهرب من سداد الأقساط يتم الرجوع إلى الضمانات، وتتمحور أهم المعوقات التي تواجه عملية إدارة الائتمان في مصرف الجمهورية في نقص تأهيل الموظفين خاصة في جوانب الشريعة ومعاملاتها التجارية، ومدى مناسبة القوانين والتشريعات وأساليب إدارة المخاطر نفسها، وضعف في التكنولوجيا بالمصرف، والظروف السياسية للبلاد، وبعض المخاطر المصاحبة كالسيولة ونقص الوعي لدى العملاء بصيغ التمويل الإسلامي، والتركيز على المرابحة دون غيرها من المنتجات الإسلامية، والحلول لهذه المعوقات تتم عن طريق الاهتمام بالتدريب المناسب للموظفين، وأخذ الضمانات الحقيقية وتكثيف دور الرقابة الشرعية، وضرورة وجود مبادرات سياسية واقتصادية سيادية مثل توحيد المؤسسات بالدولة، ومعالجة نقص السيولة، وتطوير بالتكنولوجيا والاتصالات لكي يتم تطوير الائتمان والحد من المخاطر. النظرية المستخرجة من النتيجة هي نظرية مكملة لنظرية المخاطر في المصارف الإسلامية، وقد بينت عدد من الإجراءات والسياسات في إدارة المخاطر والتمويل في أكبر المؤسسات المصرفية الليبية في جانب معاملاته الإسلامية، وبينت المعوقات به

Effect of the Alkyl Chain Length Incorporated into Donor Part on the Optoelectronic Properties of the Carbazole Based Dyes: Theoretical Study

In this paper, we report a theoretical study using density functional theory (DFT) and time-dependent (TD-DFT) for R-D-π-A systems with various alkyl chains (R). Results show that the LUMO of the dye lies above the semiconductor conduction band, promoting the injection of electrons; the lower HOMO level promotes dye regeneration. The incorporation of methyl chain (CH3) has a significant reduction in the gap energy, improved red-shift absorption spectrum and increase the molar extinction coefficient at the maximum absorption wavelength compared to D. While, the increase in alkyl chain length from C2H5 to C6H13 present a relatively reduce of gap energies, low effect on the wavelength (438 nm) and converged excitation energies. DOI: http://dx.doi.org/10.17807/orbital.v9i5.100

Cynanchum Acutum L: Phytochemical Screening, Allelopathic and Cyto/Genotoxicity Effects in the Plant Model Arachis Hypogaea

Abstract The plant Cynanchum acutum L. growing in the Algerian desert is a weed a climber, but it has been used in popular medicine. This plant is rich in biologically active compounds, so it can be valued and exploited to produce specific biopesticides. In this regard, the work aims to assess the allelopathic effect of the aqueous extract of the air part of Cynanchum ActumL through phytochemical screening, where the results showed that the plant contained (coumarins, ,saponins polyphenols, flavonoids, alcaloids, terpenes,tannins, quinones, aldehydes, and cardioglycoside ). Four levels of concentration were tested (control,15mg/ml, 30mg/ml and 45mg/ml) where the extract affected negatively on all indicators of germination and initial development of Arachis hypogaea L. And their value decreased linearly until it disappeared at a concentration of 45 mg/ml, and the percentage of inhibition linearly increased until it reached 100% at concentration 45 mg/ml with statistically significant differences recorded. This confirms the existence of an inhibition process that was confirmed by the microscopic study to detect the cytotoxicity of the seeds of Arachis hypogaea L. Treatment with an aqueous extract with a concentration that inhibits root growth 50%, which was extracted from the root growth equation, which showed a decrease in the mitotic index with the observation of chromosomal abnormalities such as (the beginning of the formation of 2 micronucleus at interphase, micronucleus at interphase, binucleated cells at interphase, disturbed at metaphase, stickiness at metaphase, oblique at metaphase, fragments at metaphase, bridge at anaphase, and binucleated cells diagonal)

Improved Photocatalyzed Degradation of Phenol, as a Model Pollutant, over Metal-Impregnated Nanosized TiO₂

[Abstract] Photocatalyzed degradation of phenol in aqueous solution over surface impregnated TiO₂ (M = Cu, Cr, V) under UV-Vis (366 nm) and UV (254 nm) irradiation is described. Nanosized photocatalyts were prepared from TiO₂-P25 by wet impregnation, and characterized by X-ray diffraction, X-ray fluorescence, transmission electron microscopy, UV-Vis diffuse reflectance spectroscopy, Raman spectroscopy, and adsorption studies. No oxide phases of the metal dopants were found, although their presence in the TiO₂-P25 lattice induces tensile strain in Cu-impregnated TiO₂-P25, whereas compressive strain in Cr- and V-impregnated TiO₂-P25. Experimental evidences support chemical and mechanical stability of the photocatalysts. Type IV N₂ adsorption–desorption isotherms, with a small H3 loop near the maximum relative pressure were observed. Metal surface impregnated photocatalysts are mesoporous with a similar surface roughness, and a narrow pore distribution around ca. 25 Å. They were chemically stable, showing no metal lixiviation. Their photocatalytic activity was followed by UV-Vis spectroscopy and HPLC–UV. A first order kinetic model appropriately fitted the experimental data. The fastest phenol degradation was obtained with M (0.1%)/TiO₂-P25, the reactivity order being Cu > V >> Cr > TiO₂-P25 under 366 nm irradiation, while TiO₂-P25 > Cu > V > Cr, when using 254 nm radiation. TOC removal under 366 nm irradiation for 300 min showed almost quantitative mineralization for all tested materials, while 254 nm irradiation for 60 min led to maximal TOC removal (ca. 30%). Photoproducts and intermediate photoproducts were identified by HPLC–MS, and appropriate reaction pathways are proposed. The energy efficiency of the process was analysed, showing UV lamps are superior to UVA lamps, and that the efficiency of the surface impregnated catalyst varies in the order Cu > V > Cr.This research was partially supported by the Group of Chemical Reactivity & Photoreactivity at University and funded by the Spanish Ministerio de Economía y Competitividad through project CTQ2015-71238-R (MINECO/FEDER), and the regional government Xunta de Galicia (Project Grupo Potencial Crecemento (GPC) ED431B 2017/59), respectivelyXunta de Galicia; ED431B 2017/5

Cobalt Impregnation on Titania Photocatalysts Enhances Vis Phenol Photodegradation

This article belongs to the Special Issue Advanced Catalysts for Energy and Environmental Applications[Abstract] One of the main challenges of photocatalysis is to find a stable and effective photocatalyst, that is active and effective under sunlight. Here, we discuss the photocatalytic degradation of phenol as a model pollutant in aqueous solution using NUV-Vis (>366 nm) and UV (254 nm) in the presence of TiO2-P25 impregnated with different concentrations of Co (0.1%, 0.3%, 0.5%, and 1%). The modification of the surface of the photocatalyst was performed by wet impregnation, and the obtained solids were characterized using X-ray diffraction, XPS, SEM, EDS, TEM, N2 physisorption, Raman and UV-Vis DRS, which revealed the structural and morphological stability of the modified material. BET isotherms are type IV, with slit-shaped pores formed by nonrigid aggregate particles and no pore networks and a small H3 loop near the maximum relative pressure. The doped samples show increased crystallite sizes and a lower band gap, extending visible light harvesting. All prepared catalysts showed band gaps in the interval 2.3–2.5 eV. The photocatalytic degradation of aqueous phenol over TiO2-P25 and Co(X%)/TiO2 was monitored using UV-Vis spectrophotometry: Co(0.1%)/TiO2 being the most effective with NUV-Vis irradiation. TOC analysis showed ca. 96% TOC removal with NUV-Vis radiation, while only 23% removal under UV radiation.This research received support through grant TED2021-132667B-I00, funded by the EU NextGenerationEU/PRTR through project MCIN/AEI/10.13039/501100011033. Financial support was also provided by the regional government Xunta de Galicia through project GPC/ED431B 2020/52. S.B. thanks the KA-107 grant received from the EU through the Erasmus+ program for a research stay at UDCXunta de Galicia; ED431B 2020/5