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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>
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.
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].
Synthesis and Anti-inflammatory Activity of Certain Piperazinylthienylpyridazine Derivatives
Khalil, Omneya M.,Kadry, Hanan H.,Refaat, Hanan M. 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.7
In this study, a novel series of 2-(4-substituted piperazin-l-ylmethyl)-6-(thien-2-yl)-2H-pyridazin-3-ones (3a-f), 2-(4-substituted piperazin-l-ylcarbonylmethyl)-6-(thien-2-yl)-2H-pyridazin-3-ones (4a-c) and 2-[2-(4-substituted piperazin-l-ylcarbonylethyl)]-6-(thien-2-yl)-2H-pyridazin-3-ones (5a,b) were prepared from 6-(thien-2-yl)-2H- pyridazin-3-one (1). In addition, 3-(4-substituted piperazin-l-ylcarbonyl methyl thio)-6-(thien-2-yl) pyridazines (6a-c) and 3-[2-(4-substitutedpip-erazin-l-ylcarbonyl ethylthio]-6-(thien-2-yl) pyridazines (7a,b) were synthesized. Furthermore, 5-(4-substituted piperazin-l-ylmethyl)-6-(thien-2-yl)-2H-pyridazin-3-ones (12a,b) were prepared. The structures of the new compounds were confirmed by elemental analysis as well as by $^{1}H-NMR$, IR and MS data. Some of the newly prepared compounds were subjected to evaluation for their anti-inflammatory activity against carrageenan-induced paw edema at a dose of 10 mg/kg using indomethacin as the reference standard.
Risk Informed Design of I&C Architecture for Research Reactors
Khalil Ur, Rahman,Gyunyoung Heo IEEE 2015 IEEE transactions on nuclear science Vol.62 No.1
<P>A deterministic design philosophy for systems, structures, and components of nuclear facilities, accepted by all stakeholders, has been adopted to address safety concerns. However, over-conservatism makes the design of nuclear facilities, especially research reactors, expensive; therefore, the industry needs to reevaluate its level of over-conservatism to obtain an optimized design. This paper proposes a probabilistic design and optimization approach for instrumentation & control (I&C) systems of research reactors based on sensitivity, availability criteria, and cost. Compared to commercial nuclear power plants, research reactors are sensitive to the cost competitiveness of I&C systems, so optimization of I&C system design is needed. As a case study, we formulated four architecture configurations for a reactor protection system and performed the reliability feature analysis, assessed cost, and computed reliability index. In addition to International Electrotechnical Commission (IEC) and American Society of Mechanical Engineers (ASME) criteria, we introduce the reliability index, a novel parameter describing the correlation between cost and reliability used to determine the point at which an I&C architecture has been optimized. To observe the significance of this study, we compared our results with a benchmark architecture. Our novel probabilistic design and optimization approach produced two optimized I&C architectures with design cost reductions of 30-40% compared to the benchmark architecture, while maintaining safety and availability.</P>