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The influence of chromium ions on the growth of the calcium hydroxyapatite crystal

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Journal of Biophysical Chemistry 2012年第4期3卷 283-286页

作者： Samira M. Sallam Khairi M. Tohami Abdelsattar M. Sallam Lotfi I. Abo Salem Faten adel Mohamed Department of BioPhysics Science College Ain Shams University Cairo Egypt Department of BioPhysics Science College Cairo Egypt Department of Physics Science College Benha University Benha Egypt

Hydroxyapatite (Ca10(PO4)6(OH)2) is widely used as bio-ceramic materials and as adsorbents for separation of bio-molecules. These materials have also been used as adsorbents for heavy metals, supports and as catalysts in oxidation and dehydrogenation reactions. The catalytic performance of these materials depend on the lattice substitution of Ca sites in Hydroxyapatite structure by varied cations as Na, Mg, Sr and Mn, which result in changes in various structural pro perties as crystallinity and morphology. Pure calcium hydroxyapatite (S1) and Cr loaded hydroxyl apatite (S2, S3, S4 and S5) of different chromium concentrations have been prepared by wet precipitated method. An in-vitro examination is essential to investigate the mechanism of the deficient HA and tissue interface reaction by preparing SBF (Simulated Body Fluid) through the elemental and chemical analysis of Ca, P and Cr. FTIR used to analyze the samples after incubation in SBF for 24 day. PH of the samples also was measured at the first period of immersion time. At high loading of chromium ions, the formation of carbonate apatite decrease. The concentrations of the chromium in the Cr_HA crystal during the soaking in SBF are very safe dose for human.

关键词： Hydroxyapatite Crystal Calcium Growth Crystallinity Bioceramics

Planning Target Volume Margin in Linac-Based Stereotactic Radiosurgery for Brain Metastases

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Journal of Cancer Therapy 2024年第7期15卷 265-272页

作者： Hany S. Attallah Radwa M. Hamed Khaled M. EL-Shahat Aliaa Mahmoud Mahmoud Abdallah Ibraheem Haggag Emad Moustafa adel Yassin Department of Radiation Oncology International Medical Center (IMC) Cairo Egypt Department of Radiation Oncology Armed Forces Medical Collogue (AFCM) Cairo Egypt Department of Medical Physics Al Azhar University Cairo Egypt Department of Medical Physics International Medical Center (IMC) Cairo Egypt Department of Medical Physics Department of Clinical Oncology Faculty of Medicine Zagazig University Zagazig Egypt

Background: The treatment of brain metastases with radiotherapy has shifted to the use of Stereotactic Radio-surgery (SRS). The technical issue of expanding the treatment volume around the Gross Tumor Volume (GTV) is a current debate. Radiotherapy centers use variable GTV-PTV margins, ranging from one to 2 mm. Material and Methods: We performed a dosimetric comparison in plans of twenty patients using three margins: PTV zero, PTV1, and PTV2. We also developed imaginary Peel volumes. These volumes are described as follows: Peel1 = PTV1 − GTV, Peel2 = PTV2 − GTV. Results: Our results showed that the mean PTV volume differed significantly across the different margins (p = 0.000). The V12 of the brain significantly varied as a function of PTV margin (p = 0.000). The target coverage and plan quality indices were not significantly different. The Peel volume dosimetric analysis showed that the mean dose was significantly higher in the nearby normal brain tissue: Peel1 (p = 0.022) and Peel 2 (p = 0.013). Conclusion: According to our dosimetric analysis, expanding the GTV into a PTV by 1 mm margin is more convenient than 2 mm.

关键词： SRS Brain Metastases PTV

Peristaltic Transport of Magnetohydrodynamic Carreau Nanofluid with Heat and Mass Transfer inside Asymmetric Channel

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American Journal of Computational Mathematics 2017年第1期7卷 1-20页

作者： Nabil T. M. Eldabe Osama M. Abo-Seida adel A. S. Abo-Seliem A. A. ElShekhipy Nada Hegazy Mathematics Department Faculty of Education Ain Shams University Cairo Egypt Faculty of Computers and Information Kafrelsheikh University Kafrelsheikh Egypt Mathematics Department Faculty of Science Kafrelsheikh University Kafrelsheikh Egypt Mathematics Department Faculty of Science Minia University El-Minia Egypt Mathematics Department Faculty of science Imam Abdulrahman Bin Faisal University Al-Dammam KSA

In this work, the peristaltic motion of a nano non-Newtonian fluid which obeys Carreau model through a porous medium inside an asymmetric channel is investigated. The hall current effects with Joule heating and viscous dissipation are considered. The problem is modulated mathematically by a set of nonlinear partial differential equations which describe the conservation of mass, momentum, energy and concentration of nanoparticles. The non-dimensional form of these equations is simplified under the assumption of long wavelength and low Reynolds number, and then resulting equations of coupled nonlinear differential equations are tackled numerically with appropriate boundary conditions. Graphical results are presented for dimensionless velocity, temperature, concentration and pressure gradient in order to illustrate the variations of various parameters of this problem on these obtained solutions.

关键词： Peristaltic Motion MHD Carreau Nanofluid Asymmetric Channel Porous Medium Heat and Mass Transfer

Internet of Things for Digital Forensics Application in Saudi Arabia

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Advances in Internet of Things 2023年第1期13卷 1-11页

作者： Faihan B. Bindrwish Amer Nizar Abu Ali Wed H. Ghabban Alaaldin Alrowwad Najmah adel Fallatah Omair Ameerbakhsh Ibrahim M. Alfadli Information System Department College of Computer Science and Engineering Taibah University Madina Saudi Arabia Applied College University of Tabuk Tabuk Saudi Arabia Department of Business School The University of Jordan Aqaba Branch Aqaba Jordan

Despite the extensive empirical literature relating to the Internet of Things (IoT), surprisingly few attempts have sought to establish the ways in which digital forensics can be applied to undertake detailed examinations regarding IoT frameworks. The existing digital forensic applications have effectively held back efforts to align the IoT with digital forensic strategies. This is because the forensic applications are ill-suited to the highly complex IoT frameworks and would, therefore, struggle to amass, analyze and test the necessary evidence that would be required by a court. As such, there is a need to develop a suitable forensic framework to facilitate forensic investigations in IoT settings. Nor has considerable progress been made in terms of collecting and saving network and server logs from IoT settings to enable examinations. Consequently, this study sets out to develop and test the FB system which is a lightweight forensic framework capable of improving the scope of investigations in IoT environments. The FB system can organize the management of various IoT devices found in a smart apartment, all of which is controlled by the owner’s smart watch. This will help to perform useful functions, automate the decision-making process, and ensure that the system remains secure. A Java app is utilized to simulate the FB system, learning the user’s requirements and security expectations when installed and employing the MySQL server as a means of logging the communications of the various IoT devices.

关键词： Smart Home Internet of Things Digital Forensic FB Framework

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外资水务企业在华直接投资浅析

水利经济 2016年第4期34卷 17-20,73-74页

作者：周伟 Boulanger Mathieu adel Ben Youssef Grazia Cecere 武汉大学经济与管理学院湖北武汉430072 武汉大学中国产学研合作问题研究中心湖北武汉430072 尼斯大学法国尼斯060000 巴黎电信管理学院法国巴黎91000

对外资水务企业在我国直接投资的发展阶段进行研究,认为外资水务企业在我国的直接投资大致经历了初期、扩张与撤退并存、停滞与渗透并存3个阶段;探讨了外资水务企业进入我国市场带来的主要问题,即:水务产业安全、与我国水务企业的竞争... 详细信息

对外资水务企业在我国直接投资的发展阶段进行研究,认为外资水务企业在我国的直接投资大致经历了初期、扩张与撤退并存、停滞与渗透并存3个阶段;探讨了外资水务企业进入我国市场带来的主要问题,即:水务产业安全、与我国水务企业的竞争加剧、公众利益保护等。最后提出解决以上问题的方案:根据水务产业的特征将水务产业链细分成自然垄断环节和非自然垄断环节,对自然垄断环节进行严格的管制,而非自然垄断环节,可以适度引入竞争机制;通过示范效应和人才流动学习外资水务企业先进的管理经营和技术,构建我国水务企业的竞争优势;提高公众和企业的参与度,加强对外资水务企业的监督管理。

关键词：外资水务企业对外直接投资(FDI) 发展阶段

Effect of Substrates on the Properties of ZnO Thin Films Grown by Pulsed Laser Deposition

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Advances in Materials Physics and Chemistry 2013年第4期3卷 209-213页

作者： adel Taabouche Abderrahmane Bouabellou Fouad Kermiche Faouzi Hanini Sarah Menakh Yacine Bouachiba Tahar Kerdja Chawki Benazzouz Mohamed Bouafia Saad Amara Advanced Technology Development Center (CDTA) Baba-Hassen Algiers Algeria Center CRNA 2 Bd Franz Fanon Algiers Algeria Laboratory of Applied Optics Ferhat Abbas University Setif Algeria Thin Films and Interfaces Laboratory University of Constantine Constantine Algeria

Polycrystalline zinc oxide (ZnO) thin films have been deposited at 450°C onto glass and silicon substrates by pulsed laser deposition technique (PLD). The used source was a KrF excimer laser (248 nm, 25 ns, 5 Hz, 2 J/cm2). The effects of glass and silicon substrates on structural and optical properties of ZnO films have been investigated. X-ray diffraction patterns showed that ZnO films are polycrystalline with a hexagonal wurtzite—type structure with a strong (103) orientation and have a good crystallinity on monocrystalline Si(100) substrate. The thickness and compositional depth profile were studied by Rutherford Backscattering spectrometry (RBS). The average transmittance of ZnO films deposited on glass substrate in the visible range is 70%.

关键词： ZnO Thin Films PLD Silicon X-Ray Diffraction Optical Transmittance RBS

Synthesis and characterization of hydroxyapatite contain chromium

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Journal of Biophysical Chemistry 2012年第4期3卷 278-282页

作者： Samira M. Sallam Khairi M. Tohami Abdelsattar M. Sallam Lotfi I. Abo Salem Faten adel Mohamed Department of BioPhysics Science College Ain Shams University Cairo Egypt Department of BioPhysics Science College El Azhar University Cairo Egypt Department of Physics Science College Benha University Banha Egypt

Hydroxy apatite (HA) is a biocompatible material used as bone-substitute materials in both orthopedics and dentistry due to its excellent osteo-conductive and chemical composition similar to that of the inorganic part of bone in comparison with other implant materials . HA (S1) and Cr loaded hydroxy apatite (S2, S3, S4 and S5) of different chromium concentrations have been prepared. many techniques used to analyze the changes occurred due to the substitution. The XRD (X-ray diffraction) and FTIR (Fourier transform infrared radiation )spectroscopy were used as analytical techniques for the prepared HA and Cr loaded HA. The effect of the heat treatment on structural change of the samples was examined by DTA. It was found that all the samples have the same crystalline structure. The crystallinity of the samples decreased as the chromium ions concentration increase.

关键词： Component Formatting Style Styling Insert

The challenges of transitioning from linear to high-order overlay control in advanced lithography

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The challenges of transitioning from linear to high-order ov...

Impact of Presence or Absence of Trehalose during Vitrification on Viability and Development of Vitrified/Warmed Immature Dromedary Camel Oocytes

2007亚洲光电子会议量子光学在计算与通信中的应用分会场

作者： M. adel P. Izikson D. Tien J. C. Robinson B. Eichelberger KLA-Tencor Corp.(Israel) Haticshoret St. P.O Box 143 Migdal Haemek 23100 Israel KLA-Tencor Corp. One Technology Drive Milpitas CA USA 95035

In the lithography section of the ITRS 2006 update, at the top of the list of difficult challenges appears the text "overlay of multiple exposures including mask image placement". This is a reflection of the fact that today overlay is becoming a major yield risk factor in semiconductor manufacturing. Historically, lithographers have achieved sufficient alignment accuracy and hence layer to layer overlay control by relying on models which define overlay as a linear function of the field and wafer coordinates. These linear terms were easily translated to correctibles in the available exposure tool degrees of freedom on the wafer and reticle stages. However, as the 45 nm half pitch node reaches production, exposure tool vendors have begun to make available, and lithographers have begun to utilize so called high order wafer and field control, in which either look up table or high order polynomial models are modified on a product by product basis. In this paper, the major challenges of this transition will be described. It will include characterization of the sources of variation which need to be controlled by these new models and the overlay and alignment sampling optimization problem which needs to be addressed, while maintaining the ever tightening demands on productivity and cost of ownership.

关键词： Scanner, Overlay metrology, high order modeling

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Open Journal of Animal Sciences 2022年第3期12卷 347-359页

作者： Karim A. Yaqout Ahmed Monir Magdy R. Badr Abou Bakr A. EL-Wishy adel R. Moawad Amr S. El-Shalofy Department of Theriogenology Faculty of Veterinary Medicine Cairo University Giza Egypt Department of AI and ET Animal Reproduction Research Institute Agriculture Research Centre Giza Egypt Division of Animal Science College of Agriculture Family Sciences and Technology Fort Valley State University Fort Valley GA USA

Vitrification of immature oocytes at the germinal vesicle (GV) stage is important to preserve female gametes. The standard formula for vitrification solutions has long been a debate. Herein, we investigated the effect of the presence or absence of trehalose in vitrification solution on viability, in vitro maturation (IVM) rates, and development of vitrified/warmed immature dromedary camel oocytes. Cumulus oocyte complexes (COCs) obtained at slaughter from the ovaries of mature she-camels were randomly allocated into three groups;namely, control group, oocytes were directly subjected to IVM without vitrification, vitrification solution 1 (VS1) group, oocytes were vitrified in a solution composed of 25% ethylene glycol (EG) plus 25% dimethyl sulfoxide (DMSO) + 0.5 M trehalose;and vitrification solution 2 (VS2) group, oocytes were vitrified in a solution composed of 25% EG plus 25% DMSO. Vitrification of COCs was conducted by open pulled straws (OPS) method. Following vitrification and warming, morphologically viable oocytes were matured in vitro for 36 h. COCs were then fertilized and cultured in vitro for 7 days. The percentage of viable oocytes was significantly higher (P 0.05) in VS2 than VS1 group (80.0% vs. 63.3%, respectively). Nuclear maturation, cleavage (48 h post-insemination;pi), and blastocyst rates (7 days pi) were significantly higher (P < 0.05) in VS2 than in VS1 groups. No significant differences were observed in oocyte maturation and development rates between VS2 and control groups. In conclusion, vitrification of immature dromedary camel oocytes in trehalose-free solution (VS2) was more advantageous than that in trehalose supplemented media since it did not reduce viability and development.

关键词： Camel GV Oocyte IVM Trehalose Vitrification