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Carbon Nanofibers Containing Ag/TiO<sub>2</sub>Composites as a Preliminary stage for CDI Technology

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Journal of materials science and Chemical engineering 2014年第1期2卷 31-37页

作者： Khalil Abdelrazek Khalil Hamoud eltaleb hany s. Abdo salem s. Al-Deyab H. Fouad 1mechanical engineering Department College of Engineering King Saud University Riyadh Saudi Arabia 2Mechanical Design and Materials Department Faculty of Energy Engineering Aswan University Aswan Egypt Biomedical engineering Dept. Faculty of Engineering Helwan University Ain Helwan Egypt Department of chemistry Petrochemical research chair King Saud University Riyadh Riyadh Saudi Arabia

silver/titanium dioxide composite nanoparticles imbedded in polyacrylonitrile (PAN) nanofibers and converted into carbon nanofibers by stabilization and calcination was obtained and tested for capacitive deionization technology. First, the silver ions were converted to metallic silver nanoparticles, through reduction of silver nitrate with dilute solution of PAN. second, the TiO2 precursor (Titanium Isopropoxide) was added to the solution to form Ag/TiO2 composites imbedded in the PAN polymer solution. Last step involves electrospinning of viscous PAN solution containing silver/TiO2 nanoparticles, thus obtaining PAN nanofibers containing silver/TiO2 nanoparticles. scanning electron microscopy (sem) revealed that the diameter of the nanofibers ranged between 50 and 300 nm. Transmission electron microscopy (Tem) and energy dispersive spectroscopy (eDs) showed silver/TiO2 nanoparticles dispersed on the surface of the carbon nanofibers. The obtained fiber was fully characterized by measuring and comparing the FTIR spectra and thermogravimetric analysis (TGA) diagrams of PAN nanofiber with and without imbedded nanoparticles, in order to show the effect of silver/TiO2 nanoparticles on the electrospun fiber properties.

关键词： Polyacrylonitrile (PAN) Nanofibers Carbon Nanofibers electrospinning silver/TiO2 Nanoparticles

The impact of intensity modulated radiotherapy on the skin dose for deep seated tumors

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The Chinese-German Journal of Clinical Oncology 2013年第4期12卷 194-198页

作者： H. s. Abou-elenein ehab m. Attalla hany Ammar Ismail eldesoky mohamed Farouk shaimaa shoer Children's Cancer Hospital Cairo University National Cancer Institute Cairo University

Objective: The purpose of this study was to investigate the impact of intensity modulated radiotherapy (ImRT) on surface doses for brain, abdomen and pelvis deep located tumors treated with 6 mV photon and to evaluate the skin dose calculation accuracy of the XIO 4.04 treatment planning system. methods: more investigations for the influences of ImRT on skin doses would increase its applications for many treatment sites. measuring skin doses in real treatment situations would reduce the uncertainty of skin dose prediction. In this work a pediatric human phantom was covered by a layer of 1 mm bolus at three treatment sites and thermoluminescent dosimeter (TLD) chips were inserted into the bolus at each treatment site before CT scan. Two different treatment plans [three-dimensional conformal radiation therapy (3DCRT) and ImRT] for each treatment sites were performed on XIO 4.04 treatment planning system using superposition algorism. Results: The results showed that the surface doses for 3DCRT were higher than the surface doses in ImRT by 1.6%, 2.5% and 3.2% for brain, abdomen and pelvis sites respectively. There was good agreement between measured and calculated surface doses, where the calculated surface dose was 15.5% for brain tumor calculated with 3DCRT whereas the measured surface dose was 12.1%. For abdomen site the calculated surface dose for ImRT treatment plan was 16.5% whereas the measured surface dose was 12.6%. Conclusion: The skin dose in ImRT for deep seated tumors is lower than that in 3DCRT which is another advantage for the ImRT. The TLD readings showed that the difference between the calculated and measured point dose is negligible. The superposition calculation algorism of the XIO 4.04 treatment planning system modeled the superficial dose well.

关键词： skin dose intensity modulated radiotherapy (ImRT) three-dimensional conformal radiation therapy (3DCRT) thermoluminescent dosimeter (TLD) dose calculation

Peak-Average-Power Ratio Techniques for 5G Waveforms Using D-sLm and D-PTs

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Computer systems science & engineering 2023年第5期45卷 1199-1210页

作者： Himanshu sharma karthikeyan Rajagopal G.Gugapriya Rajneesh Pareek Arun Kumar Hayamesfer Alshahrani mohamed K.Nour hany mahgoub mohamed mousa Anwer mustafa Hilal Department of Computer science&engineering JECRC UniversityJaipurIndia Centre for Nonlinear systems Chennai Institute of TechnologyChennaiIndia school of electronics engineering Vellore Institute of TechnologyChennaiIndia Department of electronics and Communication engineering JECRC UniversityJaipurIndia Department of Information systems College of Computer and Information SciencesPrincess Nourah Bint Abdulrahman UniversityP.O.Box 84428Riyadh11671Saudi Arabia Department of Computer science College of Computing and Information SystemUmm Al-Qura UniversitySaudi Arabia Department of Computer science College of Science&Art at MahayilKing Khalid UniversitySaudi Arabia electrical engineering Department Faculty of Engineering and TechnologyFuture University in EgyptNew Cairo11845Egypt Department of Computer and self Development Preparatory Year DeanshipPrince Sattam bin Abdulaziz UniversityAlKharjSaudi Arabia

multicarrier Waveform(mCW)has several advantages and plays a very important role in cellular *** generation(5G)mCW such as Non-Orthogonal multiple Access(NOmA)and Filter Bank multicarrier(FBmC)are thought to be important in 5G *** Peak to Average Power Ratio(PAPR)is seen as a serious concern in mCW since it reduces the efficiency of amplifier use in the user *** paper presents a novel Divergence selective mapping(DsLm)and Divergence Partial Transmission sequence(D-PTs)for 5G *** is seen that the proposed D-sLm and PTs lower PAPR with low computational *** work highlighted a combination of multi-data block partial transmit schemes along with tone *** this,an overlapping factor is used to determine the number of data blocks for every ***,considering only those data blocks that have minimum signal power,the use of DsLm and DPTs are required to eliminate the segment’s *** results reveal that the suggested hybrid technique proves to be better than the conventional PTs ***,the power saving performance of FBmC and NOmA is compared with the Orthogonal Frequency Division multiplexing(OFDm)waveform.

关键词： 5G PAPR D-sLm D-PTs

On the development of modular polyurethane-based bioelastomers for rapid hemostasis and wound healing

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Regenerative Biomaterials 2023年第1期10卷 640-654页

作者： Wanxin Guo Binan Zhao muhammad shafiq Xiao Yu Yihong shen Jie Cui Yujie Chen Pengfei Cai Zhengchao Yuan mohamed eL-Newehy hany eL-Hamshary Yosry morsi Binbin sun Jianfeng Pan Xiumei mo state Key Laboratory for modification of Chemical Fibers and Polymer materials Shanghai Engineering Research Center of Nano-Biomaterials and Regenerative MedicineCollege of Biological Science and Medical EngineeringDonghua UniversitySongjiangShanghai 201620P.R.China Department of Orthopedics Shanghai Tongji HospitalSchool of MedicineTongji UniversityPutuoShanghai 200065China Department of Chemical engineering Faculty of EngineeringGraduate SchoolKyushu UniversityFukuoka 819-0395Japan Department of Chemistry College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia Faculty of engineering and Industrial sciences Swinburne University of TechnologyBoroondaraVIC 3122Australia Department of Orthopedics Shanghai Tenth People’s HospitalSchool of MedicineTongji UniversityJinganShanghai 200072China

massive hemorrhage may be detrimental to the patients,which necessitates the advent of new materials with high hemostatic efficiency and good *** objective of this research was to screen for the effect of the different types of bio-elastomers as hemostatic dressings.3D loose nanofiber sponges were prepared;PU-TA/Gel showed promising ***(PU)was synthesized and electrospun to afford porous sponges,which were crosslinked with glutaraldehyde(GA).FTIR and 1H-NmR evidenced the successful synthesis of *** prepared PU-TA/Gel sponge had the highest porosity and water absorption ***,PU-TA/Gel sponges exhibited cytocompatibility,negligible hemolysis and the shortest clotting ***-TA/Gel sponge rapidly induced stable blood clots with shorter hemostasis time and less bleeding volume in a liver injury model in ***,PU-TA/Gel sponges also induced good skin regeneration in a full-thickness excisional defect model as revealed by the histological *** results showed that the PU-TA/Gel-based sponges may offer an alternative platform for hemostasis and wound healing.

关键词： polyurethane electrospinning hemostasis material wound healing tissue regeneration regenerative medicine

Four Levels Anterior Cervical Discectomy and Fusion by stand Alone PeeK Cages

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Open Journal of modern Neurosurgery 2018年第2期8卷 162-173页

作者： Islam Alaghory hany Abdel Gawwad soliman saeed mostafa Abdelhameed Neurosurgery Department Al-Azhar University Hospitals Cairo Egypt Orthopaedic Department Al-Azhar University Hospitals Al-Azhar University Cairo Egypt Anaesthesia and Intensive Care Department Al-Azhar University Hospitals Cairo Egypt

Background: cervical spondylotic myelopathy is a common health problem that neurosurgeons face in egypt. The aim of this study is to evaluate the efficacy of PeeK cage only in 4 levels anterior cervical discectomy as one of surgical option other than anterior cervical corpectomy, fixation by plat or posterior approach for cervical laminectomy, and assessment of post spinal surgery pain. methods: this prospective study on 28 patients with cervical spondylotic myelopathy (Csm) over a period of 3 years (between April 2012 and April 2015) with mean period of follow up 30 months. We have done anterior cervical discectomy with fixation by cage only for all cases with perioperative assessment and scoring clinically and radiologically (Japanese Orthopaedic Association [JOA] scores, Visual Analogue scale [VAs] scores for assessment of neck and arm pain, perioperative parameters (hospital stay, blood loss, operative time), the european myelopathy scoring (ems) and Odom’s criteria, and the incidence of complication,post spinal surgery pain assessment). Results: clinical outcome was excellent (28.55), good (50%) and fair (21.5) according to Odom criteria. The european myelopathy scoring (ems), improved from 10 to 16. The mean JOA score improved from 10.1 ± 2.1 to 14.2 ± 2.3. Fusion failure had been seen in 4 patients in one level for each secondary to anterior displacement of the cage with no other major complications. Conclusion: 4 levels anterior cervical discectomy with PeeK cage only is an effective, save and less costly with less post operative complication and hospital stay and less post spinal surgery pain.

关键词： Four Levels Cervical Disc Peek Cage Fusion Cervical spondylotic myelopathy

Pre-treatment verification of intensity-modulated radiation therapy in paediatric patients: adequate estimation for tolerance limits

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The Chinese-German Journal of Clinical Oncology 2012年第11期11卷 621-625页

作者： ehab m. Attalla Hassan shafik hany Ammar Ismail eldesoky mohamed Farouk shimaa shoier Radiotherapy & Nuclear medicine Department National Cancer Institute Cairo University Children Cancer Hospital

Objective: The objective of this work was to establish adequate tolerance limits based on a certain defined institutional indices and generate published data presenting our results to the radiotherapy community. methods: One hundred paediatric patients were treated using 6-mV X-ray beams produced by siemens ONCOR expression linear accelerator. The clinical step-and-shoot intensity-modulated radiation therapy (ImRT) treatment plans were designed using KonRad release 2.2.23. For two treatment sites (abdomen, head and neck), the fluence maps generated by the treatment planning system were all delivered for the quality assurance (QA) which included absolute dose verification for all treatment fields, relative dose verification for each treatment field. Results: The 724 fluence maps were analyzed at three different criteria using the gamma index tool. The 3% dose difference of local prescribed dose /3 mm was considered adequate. The passing rate for all fields of all plans always exceeded 70%. The dose differences between the measured and calculated doses ranged from -2.2% to +4% [mean and standard deviation (s): 1.4 ± 1.5] for the abdominal case, and from -3.3% to +5.6% (1.3 ± 1.6) for head and neck case with total confidence limit 0.046 (4.6%). The 14/100 (14%) of the absolute point dose measurements were out of ±3% from the dose predicted by the treatment planning system. Only two cases were below -3%, while 12 cases over +3%. Conclusion: At 3% dose difference of local prescribed dose /3 mm criteria, a 75% passing a gamma criterion and 3% for absolute point dose can be achieved for abdomen and head and neck treatments site. We considered the tolerance limits based on these indices for ImRT QA adequate.

关键词： intensity-modulated radiation therapy (ImRT) quality assurance (QA) tolerance paediatric patient

Intensive care unit readmission in adult egyptian patients undergoing living donor liver transplant:A single-centre retrospective cohort study

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World Journal of Hepatology 2022年第6期14卷 1150-1161页

作者： manar salah Iman Fawzy montasser Hanaa A el Gendy Alaa A Korraa Gamal m elewa hany Dabbous Hossam R mahfouz mostafa Abdelrahman mohammed Hisham Goda mohamed mohamed Bahaa el-Din mahmoud el-meteini Heba A Labib Department of Tropical medicine Ain Shams Center for Organ TransplantationAin Shams UniversityCairo 11566Egypt Department of Anaesthesia and Critical Care Ain Shams Centre for Organ TransplantationAin Shams UniversityCairo 11566Egypt Department of General surgery and Liver Transplantation Ain Shams Centre for Organ TransplantationAin Shams UniversityCairo 11566Egypt

BACKGROUND Patients who undergo living donor liver transplantation(LDLT)may suffer complications that require intensive care unit(ICU)*** To identify the incidence,causes,and outcomes of ICU readmission after *** A retrospective cohort study was conducted on patients who underwent *** collected data included patient demographics,preoperative characteristics,intraoperative details;postoperative stay,complications,causes of ICU readmission,and *** were divided into two groups according to ICU readmission after hospital *** factors for ICU readmission were identified in univariate and multivariate *** The present study included 299 ***-one(10.4%)patients were readmitted to the ICU after *** who were readmitted to the ICU were older in age(53.0±5.1 vs 49.4±8.8,P=0.001)and had a significantly higher percentage of women(29%vs 13.4%,P=0.032),diabetics(41.9%vs 24.6%,P=0.039),hypertensives(22.6%vs 6.3%,P=0.006),and renal(6.5%vs 0%,P=0.010)patients as well as a significantly longer initial ICU stay(6 vs 4 d,respectively,Pstic regression analysis revealed that significant independent risk factors for ICU readmission included recipient age(OR=1.048,95%CI=1.005-1.094,P=0.030)and length of initial hospital stay(OR=0.836,95%CI=0.789-0.885,PsION The identification of high-risk patients(older age and shorter initial hospital stay)before ICU discharge may help provide optimal care and tailor follow-up to reduce the rate of ICU readmission.

关键词： Intensive care units Liver transplantation Patient readmission Risk factors

Thermal stability of nanocrystalline Al-10Fe-5Cr bulk alloy

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Transactions of Nonferrous metals society of China 2019年第2期29卷 242-252页

作者： muneer BAIG hany R.AmmAR Asiful H.seIKH Jabair A.mOHAmmeD Fahad AL-mUFADI Abdulaziz ALABOODI engineering management Department College of Engineering Prince Sultan University mechanical engineering Department College of Engineering Qassim University metallurgical and materials engineering Department Faculty of Petroleum and Mining Engineering Suez University Center of excellence for Research in engineering material King Saud University

Thermal stability of nanocrystalline Al-10wt.%Fe-5wt.%Cr bulk alloy was *** initial micro-grained mixture of powders was processed for 100 h using mechanical alloying(mA)to produce nano-grained *** processed powders were sintered using high frequency induction heat sintering(HFIHs).The microstructures of the processed alloy in the form of powders and bulk samples were investigated using XRD,Fesem and *** and compression tests were conducted on the bulk samples for evaluating their mechanical *** evaluate the thermal stability of the bulk samples,they were experimented at 573,623,673 and 723 K under compression load at strain rates of 1×10^-1 and 1×10^-2 s^-*** annealed samples exhibited a significant increase in their microhardness value of 2.65 GPa when being annealed at 723 K,as compared to 2.25 GPa of the as-sintered *** bulk alloy revealed compressive strengths of 520 mPa and 450 mPa at 300 K and 723 K,respectively,when applying a strain rate of 1×10^-1 s^-*** microstructural stability of the bulk alloy was ascribed to the formation of iron and chromium containing phases with Al such as Al6Fe,Al13Fe4 and Al13Cr2,in addition to the supersaturated solid solution(ssss)of Cr and Fe in Al matrix.

关键词： nanocrystalline Al-Fe-Cr alloy mechanical alloying consolidation thermal stability

Wi-Fi Traffic enforcement system (WiTe)

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Journal of Transportation Technologies 2013年第2期3卷 142-148页

作者： Fady W. Gendi Tarek K. Refaat Amir H. sadek Ramez m. Daoud Hassanein H. Amer Chahir s. Fahmy Omar m. Kassem hany m. elsayed electronics and Communication Department Cairo University Giza Egypt electronics engineering Department American University in Cairo New Cairo Egypt

This paper proposes a single integrated traffic enforcement system that is able to recognize and report various traffic violations. It consists of a Wi-Fi infrastructure that enables communication between moving vehicles and a central node. Unlike existing solutions, which address single violations, the proposed model encompasses several issues like exceeding speed limits, entering a no entry street, car theft, congestion and tolling. OPNeT simulations were run to test the Wi-Fi model and define its different characteristics and limitations. A proof-of-concept case was modeled, and the proposed architecture succeeded in meeting all design requirements.

关键词： Wi-Fi Traffic enforcement Vehicular Networking Vehicle to Infrastructure (V2I) Infrastructure to Vehicle (I2V)