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High-frequency Induction Heating Sintering of Hydroxyapatite-(ZrO2+3%Mol Y2O3) Bioceramics
Khalil Khalil Abdel-razek,Kim Sug-Won 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
In this study, hydroxyapatite (HAp) and hydroxyapatite-yttria stabilized zirconia (HAp-3YSZ) with 20 vol. %- (ZrO2+3 %mol Y2O3) nanopowders were consolidated very rapidly to full density by High-frequency induction heat sintering (HFIHS). Effects of temperature and the addition of 3YSZ on the toughness, hardness and microstructure properties have been studied. 3YSZ second phase toughening HAp composites with higher toughness were successfully developed at relatively low temperatures through this technique. Compared with hardness and toughness obtained for pure HAp, the hardness and toughness for HAp-20vol. % 3YSZ were much higher.
Khalil, Khalil Abdelrazek,Kim, Sug Won,Dharmaraj, N.,Kim, Kwan Woo,Kim, Hak Yong Elsevier 2007 Journal of materials processing technology Vol. No.
<P><B>Abstract</B></P><P>Novel technique was introduced to improve fracture toughness of hydroxyapatite (HAp) bioceramics. Composites of HAp/NiO with 1–5wt% of electrospun NiO nanofibers were synthesized by wet-milling technique and the mixtures were consolidated rapidly to full density by high-frequency induction heat sintering (HFIHS). Effect of electrospun NiO nanofibers content on the toughness, hardness and microstructure properties was studied. The resulting composites showed good sintering behaviors, high toughness and hardness. Compared with the toughness of pure HAp, the heat sintered HAp/NiO nanofiber composites showed 200% increase in the toughness by the addition of 5wt% NiO nanofibers. This can be related to the homogeneous dispersion of NiO nanoparticles in HAp at nanometer scales.</P>
Muhamad Luqman KHALIL(Muhamad Luqman KHALIL ),Norzalita Abd AZIZ(Norzalita Abd AZIZ ) 한국유통과학회 2023 The Journal of Asian Finance, Economics and Busine Vol.10 No.2
This study aims to address the literature gap by examining the direct relationship between big data analytics capability, marketing innovation, and organizational innovations. Additionally, this study would examine big data analytics capability as the antecedent for both innovation types and how these relationships influence firm performance. The research model is developed based on the integration of resource-based view and knowledge-based view theories. The quantitative method is used as the research methodology for this study. Based on a purposive sampling method, a total of 115 questionnaires were obtained from managers in star-rated hotels located in Malaysia. Partial least square structural equation modeling (PLS-SEM) is utilized for the data analysis. The result shows that big data analytics capability positively affects marketing and organizational innovations. The findings show that big data analytics capability and organizational innovation positively influence firm performance. Nonetheless, the result revealed that marketing innovation is not positively related to firm performance. The findings also indicate to hotel managers the importance of big data analytic capability and the resources required to build and develop this capability. The contributions from this study enrich the literature on big data and innovation, which is particularly limited in the hospitality and tourism context.
Flow Regimes and Thermal Patterns in 15th Century BC Tombs of the Valley of Kings
( Essam E Khalil ),( Fellow Asme ),( Fellow Ashrae ),( Fellow Aiaa ) 경남대학교 신소재연구소 2012 신소재연구 Vol.24 No.-
The cultural heritage left by the Egyptian Pharaohs in the tombs of the Valley of the Kings represents some of the key elements of the Egyptian cultural and tourism wealth and standing monuments demonstrating the wealth and technology of the pharaohs. These tombs were prepared to bury the Kings` mummies and artifacts for eternal life. Many of the wall paintings identifying the various ancient rituals and life style are in good conditions as the tombs were only recently opened to the public and resulted, in many instances, to dramatic deterioration of the wall paintings due in part to excessive humidity. Basically, ventilation air design systems are considered here for the tomb passage of King Ramses VII, Ramses IV, Siti II and Bay including different visitors (obstacles) alternative positioning to adequately predict the actual air flow, thermal and moisture patterns in the tombs and hence to provide energy efficient design of ventilation system and reduce the adverse effect of excessive humidity. The present work made use of packaged Computational Fluid Dynamics (CFD) programs. For the present work, following similar work of Abdel Aziz et al [1] and Khalil [2], a numerical study is carried out to define the optimum airside design of the tombs air ventilation and conditioning systems, which provides the optimum comfort and healthy conditions with optimum energy utilization. Basically, airside design types are considered here for the tomb passage of King Ramses VII, Ramses IV, Siti II and Bay, including different visitors (obstacles) alternative positioning to introduce the capability of the design to provide the optimum characteristics. The primary objective of the present work is to assess the airflow characteristics, thermal pattern and moisture distribution in the different tombs ventilation configurations in view of basic known flow characteristics. Tombs consist, typically of three gently sloping corridors. The free air supply and mechanically extracted ducted air play an important role in shaping the main flow pattern where the internal obstacles can distort the airflow pattern by increasing the recirculation zones or by deflecting the main airflow pattern, [3 and 4].
Effect of tapered-end shape of FRP sheetson stress concentration in strengthened beams
Khalil Belakhdar,Abdelouahed Tounsi,El Abbes Adda Bedia,Yeghnem Redha 국제구조공학회 2011 Steel and Composite Structures, An International J Vol.11 No.6
Bonding composite materials to structural members for strengthening purpose has received a considerable attention in recent years. The major problem when using bonded FRP or steel plates to strengthen existing structures is the high interfacial stresses that may be built up near the plate ends which lead to premature failure of the structure. As a result, many researchers have developed several analytical methods to predict the interface performance of bonded repairs. In this paper, a numerical solution using finite - differencemethod is used to calculate the interfacial stress distribution in beams strengthened with FRP plate having a tapered ends with different thinning profiles. These latter, can significantly reduce the stress concentration. In the present theoretical analysis, the adherend shear deformations are taken into account by assuming a parabolic shear stress through the thickness of both beam and bonded plate. Numerical results from the present analysis are presented to demonstrate the advantages of use the tapers in design of strengthened beams.
Khalil Mahmoodi,Leila Nasehi,Elham Karami,Mohammad Soleiman Soltanpour 대한혈관외과학회 2016 Vascular Specialist International Vol.32 No.3
Purpose: The endothelial nitric oxide synthase (eNOS) G894T polymorphismhas been reported to cause endothelial dysfunction and may have a role in thedevelopment of coronary artery disease (CAD). The aim of the present study wasto investigate the association of eNOS G894T genetic polymorphism and plasmalevels of nitric oxide (NO) with CAD risk in an Iranian population. Materials and Methods: We studied 200 patients with angiographicallydocumented CAD and 100 matched controls. Analysis of G894T geneticpolymorphism of eNOS was performed by polymerase chain reaction-restrictionfragment length polymorphism method. Plasma levels of NO were determinedusing Griess method. Biochemical analysis was conducted by routine colorimetricmethods. Results: Plasma levels of NO were significantly lower in CAD patients than controlsubjects (41.60±12.70 vs. 55.48±16.57, P=0.001). Also, the mean plasma levels ofNO were significantly lower in T allele carriers of eNOS G894T polymorphism thanG allele carriers (P<0.001). The genotype distribution and minor T allele frequencyof eNOS G894T polymorphism significantly differed between CAD patients andcontrol subjects (P<0.05). However, no significant association was found betweenthe eNOS G894T polymorphism and the severity of CAD (number of diseasedvessel) or the lipid profile of CAD patients (P>0.05). Conclusion: Reduced plasma level of NO is associated with increased risk of CADin our population. Moreover, eNOS G894T polymorphism is a significant risk factorfor CAD development via reducing the plasma levels of NO. However, eNOS G894Tpolymorphism is not a contributing factor for the severity of CAD.