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Tensile Strain Capacity Prediction of Engineered Cementitious Composites (ECC) Using Soft Computing Techniques

Computer Modeling in Engineering & Sciences 2024年第3期138卷 2925-2954页

作者： Rabar h.Faraj hemn Unis Ahmed hardi Saadullah Fathullah Alan Saeed Abdulrahman farid Abed Civil Engineering Department University of HalabjaHalabjaIraq University of Sulaimani College of EngineeringCivil Engineering DepartmentSulaimaniIraq Civil Engineering Department Komar University of Science and TechnologySulaimaniIraq Department of Engineering Kurdistan Institution for Strategic Studies and Scientific ResearchesSulaimaniIraq Department of Civil Engineering American University of SharjahSharjah26666UAE

Plain concrete is strong in compression but brittle in tension,having a low tensile strain capacity that can significantly degrade the long-term performance of concrete structures,even when steel reinforcing is *** order to address these challenges,short polymer fibers are randomly dispersed in a cement-based matrix to forma highly ductile engineered cementitious composite(ECC).Thismaterial exhibits high ductility under tensile forces,with its tensile strain being several hundred times greater than conventional *** concrete is inherently weak in tension,the tensile strain capacity(TSC)has become one of the most extensively researched *** a result,developing a model to predict the TSC of the ECC and to optimize the mixture proportions becomes ***,the effort required for laboratory trial batches to determine the TSC is *** achieve the research objectives,five distinct models,artificial neural network(ANN),nonlinear model(NLR),linear relationship model(LR),multi-logistic model(MLR),and M5P-tree model(M5P),are investigated and employed to predict the TSCof ECCmixtures containing fly *** from115 mixtures are gathered and analyzed to develop a new *** input variables include mixture proportions,fiber length and diameter,and the time required for curing the various *** model’s effectiveness is evaluated and verified based on statistical parameters such as R2,mean absolute error(MAE),scatter index(SI),root mean squared error(RMSE),and objective function(OBJ)***,the ANN model outperforms the others in predicting the TSC of the ECC,with RMSE,MAE,OBJ,SI,and R2 values of 0.42%,0.3%,0.33%,0.135%,and 0.98,respectively.

关键词： Engineered cementitious composites fly ash curing time tensile strain capacity modeling

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Toward a comprehensive hypothesis of oxygen-evolution reaction in the presence of iron and gold

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Journal of Energy Chemistry 2024年第2期89卷 172-183,I0005页

作者： Negah hashemi Jafar hussain Shah Cejun hu Subhajit Nandy Pavlo Aleshkevych Sumbal farid Keun hwa Chae Wei Xie Taifeng Liu Junhu Wang Mohammad Mahdi Najafpour Department of Chemistry Institute for Advanced Studies in Basic Sciences(IASBS)Zanjan 45137-66731Iran Center for Advanced Mössbauer Spectroscopy Mössbauer Effect Data CenterDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Key Lab of Advanced Energy Materials Chemistry(Ministry of Education) Renewable Energy Conversion and Storage CenterCollege of ChemistryNankai UniversityTianjin 300071China Advanced Analysis Center Korea Institute of Science and TechnologySeoul 02792Republic of Korea Institute of Physics Polish Academy of SciencesWarsaw 02-668Poland National and Local Joint Engineering Research Center for Applied Technology of hybrid Nanomaterials Henan UniversityKaifeng 475004HenanChina Center of Climate Change and Global Warming Institute for Advanced Studies in Basic Sciences(IASBS)Zanjan 45137-66731Iran Research Center for Basic Sciences&Modern Technologies(RBST) Institute for Advanced Studies in Basic Sciences(IASBS)Zanjan 45137-66731Iran

This study investigates the effects of Fe on the oxygen-evolution reaction(OER)in the presence of *** distinct areas of OER were identified:the first associated with Fe sites at low overpotential(~330 mV),and the second with Au sites at high overpotential(~870 mV).Various factors such as surface Fe concentration,electrochemical method,scan rate,potential range,concentration,method of adding K_(2)Fe O_(4),nature of Fe,and temperature were varied to observe diverse behaviors during OER for Fe O_(x)h_(y)/*** amounts of Fe ions had a significant impact on OER,reaching a saturation point where the activity did not increase *** electronic interaction between Fe and Au ions was indicated by X-ray photoelectron spectroscopy(XPS)and electron paramagnetic resonance(EPR)*** situ visible spectroscopy confirmed the formation of Fe O_(4)^(2-)during *** situ Mossbauer and surfaceenhanced Raman spectroscopy(SERS)analyses suggest the involvement of Fe-based species as intermediates during the rate-determining step of OER.A lattice OER mechanism based on Fe O_(x)h_(y)was proposed for operation at low *** functional theory(DFT)calculations revealed that Fe oxide,Fe-oxide clusters,and Fe doping on the Au foil exhibited different activities and stabilities during *** study provides insights into the interplay between Fe and Au in OER,advancing the understanding of OER mechanisms and offering implications for the design of efficient electrocatalytic systems.

关键词： DFT calculation Fe/Au electrocatalysis Mechanism Oxygen evolution Water oxidation

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Analysis of cerium substitution in Co-Sr based spinel ferrites for high frequency application

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Journal of Rare Earths 2024年第9期42卷 1755-1763,I0005页

作者： Laura Khudaysh Inas A.Ahmed Syeda Rabia Ejaz Sajjad Ahmad Khan Yasir A.haleem Mohamed M.Ibrahim Mahmood Ali hafiz Muhammad Tahir farid Zeinhom M.El-Bahy Department of Physics Faculty of ScienceJazan UniversityJazan45142Saudi Arabia Department of Chemistry Faculty of ScienceKing Khalid UniversityAbha62224Saudi Arabia Department of Physics The Government Sadiq College Women UniversityBahawalpur63100Pakistan Institute of Physics Khwaja Fareed University of Engineering and Information TechnologyRahim Yar Khan64200Pakistan Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif21944Saudi Arabia Centre of Excellence in Solid State Physics University of the PunjabLahorePakistan Department of Physics Government CollegeTaunsa Sharif32200Pakistan Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr City11884CairoEgypt

Spinel ferrites exhibit exceptional magnetic properties,making them a distinctive class of magnetic *** sol-gel technique was utilized for the synthesis of spinel ferrites with the chemical formula Co_(0.6)Sr_(0.4)Ce_(x)Fe_(2-x)O_(4). Following that,a comprehensive X-ray diffraction analysis unveiled the crystalline cubic structure of the synthesized *** the utilization of the M-h loop approach,the ferromagnetic attributes of ferrites were assessed,and the assimilation of rare earth elements led to substantial enhancements in saturation magnetization,remanence,and *** ferrites with a high concentration of rare earth elements have improved direct current resistivity and activation *** logarithm of a material's resistance increased from 5.29 to 8.12 Ω·cm as cerium is *** a change in the amount of cerium,the activation energy goes up from 0.19 to *** changing the frequency from 5.5 to 9.5 Ghz,the dielectric characteristics were *** the frequency goes up,the dielectric constant goes *** ferrites that have been made better in every way can be used in high-frequency applications.

关键词： Activation energy DC electrical resistance Remanence magnetization Cobalt strontium spinel ferrites high frequency application Rare earths

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Self-propagating high temperature synthesis of MoSi_2 matrix composites

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Rare Metals 2006年第3期25卷 225-230页

作者： Akhtar farid S.h. Islam Materials Science and Engineering School State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China

MoSi2 is presently regarded as the most important material for electrical heating and as one with huge potential for high temperature structural uses. MoSi2 and MoSi2 matrix composites were prepared by self-propagating high temperature synthesis （ShS）. Pure MoSi2 was obtained and a compound of MoSi2 and WSi2was synthesized in the form of predominant solid solution （Mo,W）Si2. By adding aluminum of 5.5 at.% to Mo-Si, the crystal structure of MoSi2 changed into a mixture of tetragonal Cllb MoSi2and hexagonal C40 Mo（Si,Al）2. The （Mo,W）Si2-Mo（Si,Al）2-W（Si,Al）2 composite materials were synthesized by adding aluminum of 5.5 at.% to Mo-W-Si. however, if the amount of the added aluminum was not larger than 2.5 at.%, it did not have any significant effect. ShS is an effective technology for synthesis of MoSi2 and MoSi2 matrix composites.

关键词： powder metallurgy MoSi2 matrix composites self-propagating high temperature synthesis molybdenumtungsten disilicide molybdenum aluminosilicide

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FE modeling of concrete beams and columns reinforced with FRP composites

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Defence Technology（防务技术） 2021年第1期17卷 1-14页

作者： farid Abed Chahmi Oucif Yousef Awera haya h.Mhanna hakem Alkhraisha Department of Civil Engineering American University of SharjahP.O.Box 26666United Arab Emirates Institute of Structural Mechanics(ISM) Bauhaus-Universitat WeimarMarienstraße 15D-99423WeimarGermany

Compression and flexure members such as columns and beams are critical in a structure as its failure could lead to the collapse of the *** the present work,numerical analysis of square and circle short columns,and reinforced concrete(RC)beams reinforced with fiber reinforced polymer composites are carried *** work is divided into two *** the first part,numerical study of axial behavior of square and circular concrete columns reinforced with Glass Fiber Reinforced Polymer(GFRP)and Basalt Fiber Reinforced Polymer(BFRP)bars and spiral,and Carbon Fiber Reinforced Polymer(CFRP)wraps is *** results of the first part showed that the axial capacity of the circular RC columns reinforced with GFRP increases with the increase of the longitudinal reinforcement *** addition,the results of the numerical analysis showed good correlation with the experimental *** interaction diagram for BFRP RC columns is also developed with considering various *** results of numerical modeling of RC columns strengthened with CFRP wraps revealed that the number and the spacing between the CFRP wraps provide different levels of ductility enhancement to the *** the cases considered in this study,column with two middle closely spaced CFRP wraps demonstrated the best *** the second part of this research,flexural behavior of RC beams reinforced with BFRP,GFRP and CFRP bars is investigated along with validation of the numerical model with the experimental *** results resembled the experimental observations that indicate significant effect of the FRP bar diameter and type ont he flexural capacity of the RC *** was also shown that Increasing the number of bars while keeping the same reinforcement ratio enhanced the stiffness of the RC beam.

关键词： Numerical analysis BRFP GFRP CFRP Columns Beams Experimental tests

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Flexural behavior of ECC hollow beams incorporating different synthetic fibers

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Frontiers of Structural and Civil Engineering 2021年第2期15卷 399-411页

作者： Ahmmad A.ABBAS farid h.ARNA'OT Sallal R.ABID Mustafa OZAKCA Civil Engineering Department Gaziantep UniversityGaziantep72310Turkey Building and Construction Materials Department Southern Technical University-Shatrah Technical InstituteShatrah64007Iraq College of Technical Engineering Islamic University in An NajafNajaf54001Iraq Civil Engineering Department Wasit UniversityKut52001Iraq

Twelve ECC beams with three different fiber types,along with four normal concrete beams,were tested in this study to evaluate the influence of cross-sectional hollowing on their flexural *** fiber types used were nylon monofilament(NM),low-cost untreated polyvinyl alcohol(PVA),and polypropylene(PP).Three different square hole sizes of 60,80,and 100 mm with cross-sectional hollowing ratios of 0.16,0.28,and 0.44,respectively,were adopted for each group of beams in addition to a solid *** beams were tested under four-point loading using a displacement-controlled testing *** test results showed that ECC beams can mostly withstand higher cracking and ultimate loads compared to their corresponding normal concrete *** results also showed that both the ductility and toughness of the ECC beams are higher than those of the normal concrete beams and that the ductility values of the hollow beams with a hole size of 60 mm are higher than those of the corresponding solid ***,hollow ECC beams with hole sizes of 60 and 80 mm exhibited a higher ductility than a solid normal concrete beam.

关键词： hollow beam hollowing ratio ECC flexural strength ductility toughness

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Bone marrow-derived mesenchymal stem cells ameliorate sodium nitrite-induced hypoxic brain injury in a rat model

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Neural Regeneration Research 2017年第12期12卷 1990-1999页

作者： Elham h.A.Ali Omar A.Ahmed-farid Amany A.E.Osman Faculty of Women for Art Sciences and Education Ain Shams University Cairo Egypt National Organization for Drug Control and Research (NODCAR) Giza Egypt

Sodium nitrite（Na NO2） is an inorganic salt used broadly in chemical industry. Na NO2 is highly reactive with hemoglobin causing hypoxia. Mesenchymal stem cells（MSCs） are capable of differentiating into a variety of tissue specific cells and MSC therapy is a potential method for improving brain functions. This work aims to investigate the possible therapeutic role of bone marrow-derived MSCs against Na NO2 induced hypoxic brain injury. Rats were divided into control group（treated for 3 or 6 weeks）, hypoxic（hP） group（subcutaneous injection of 35 mg/kg Na NO2 for 3 weeks to induce hypoxic brain injury）, hP recovery groups N-2 w R and N-3 w R（treated with the same dose of Na NO2 for 2 and 3 weeks respectively, followed by 4-week or 3-week self-recovery respectively）, and MSCs treated groups N-2 w SC and N-3 w SC（treated with the same dose of Na NO2 for 2 and 3 weeks respectively, followed by one injection of 2 × 106 MSCs via the tail vein in combination with 4 week self-recovery or intravenous injection of Na NO2 for 1 week in combination with 3 week self-recovery）. The levels of neurotransmitters（norepinephrine, dopamine, serotonin）, energy substances（adenosine monophosphate, adenosine diphosphate, adenosine triphosphate）, and oxidative stress markers（malondialdehyde, nitric oxide, 8-hydroxy-2′-deoxyguanosine, glutathione reduced form, and oxidized glutathione） in the frontal cortex and midbrain were measured using high performance liquid chromatography. At the same time, hematoxylin-eosin staining was performed to observe the pathological change of the injured brain tissue. Compared with hP group, pathological change of brain tissue was milder, the levels of malondialdehyde, nitric oxide, oxidized glutathione, 8-hydroxy-2′-deoxyguanosine, norepinephrine, serotonin, glutathione reduced form, and adenosine triphosphate in the frontal cortex and midbrain were significantly decreased, and glutathione reduced form/oxidized glutathione and adenosine monophosphate/adenosine

关键词： nerve regeneration hypoxia bone marrow-derived mesenchymal stem cells sodium nitrite monoamine neurotransmitter cell energy neural regeneration

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An Investigation of ~4he+^(12)C and ~4he+^(16)O Reactions Using the Cluster Model

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Communications in Theoretical Physics 2012年第7期58卷 135-140页

作者： A.h.Al-Ghamdi Awad A.Ibraheem M.El-Azab farid Physics Department Faculty of ScienceKing Abdul Aziz UniversityJeddahSaudi Arabia Physics Department Al-Azhar UniversityAssiut BranchAssiut 71524Egypt Physics Department King Khalid UniversityAbhaSaudia Arabia Physics Department Assiut UniversityAssiut 71516Egypt

The α-target semimicroscopic single folding potentials have been derived by folding a composite (repul-sive and attractive) effective α-α interaction with the α-cluster distribution density in the target nuclei. The obtained potentials are considered as the real part of the nuclear optical model potentials, while the imaginary parts are phe-nomenologicaly expressed using the Woods-Saxon form. Nine sets of measured experimental data of the 4he+12C and 4 he+16O elastic rainbow scattering over the energy range 80-240 MeV are analyzed using the obtained potentials. The data are successfully reproduced using the extracted potentials. The resulted reaction cross sections are also investigated and compared with the available corresponding data.

关键词： optical model elastic scattering folding potential cluster model

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Liver transplantation in the management of cholangiocarcinoma:Evolution and contemporary advances

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World Journal of Gastroenterology 2023年第13期29卷 1969-1981页

作者： Aditya Borakati farid Froghi Ricky h Bhogal Vasileios K Mavroeidis Department of hPB and Liver Transplantation Surgery Royal Free Hospital NHS Foundation TrustLondon NW32QGUnited Kingdom Department of Academic Surgery The Royal Marsden NHS Foundation TrustLondon SW36JJUnited Kingdom

Cholangiocarcinoma(CCA)is an aggressive malignancy arising from the biliary *** may occur at any location along the biliary tree with the perihilar area being the most *** is poor with 5-year overall survival at less than 10%,typically due to unresectable disease at *** surgical resection with clear margins offers a chance of cure in patients with resectable tumours,but is frequently not possible due to locally advanced *** the other hand,orthotopic liver transplantation(LT)allows for a radical and potentially curative resection for these patients,but has been historically controversial due to the limited supply of donor grafts and previously poor *** patients with perihilar CCA,within specific criteria and following the implementation of a protocol combining neoadjuvant chemoradiation and LT,excellent results have been achieved in the last decades,resulting in its increasing acceptance as an indication for LT and the standard of care in several centres with significant ***,in intrahepatic CCA,the role of LT remains controversial and owing to dismal previous results it is not an accepted ***,more recent studies have demonstrated favourable results with LT in early intrahepatic CCA,indicating that,under defined criteria,its role may increase in the *** review highlights the history and contemporary advances of LT in CCA,with particular focus on the improving outcomes of LT in intrahepatic and perihilar CCA and future perspectives.

关键词： Cholangiocarcinoma Klatskin tumor Liver transplantation Liver cancer Liver resection Neoadjuvant therapy

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Stereotactic radiotherapy for intrahepatic cholangiocarcinoma

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World Journal of Gastrointestinal Oncology 2022年第8期14卷 1478-1489页

作者： Aditya Borakati farid Froghi Ricky h Bhogal Vasileios K Mavroeidis Department of Surgery The Royal London HospitalBarts Health NHS TrustLondon E11FRUnited Kingdom Department of hPB and Liver Transplantation Surgery Royal Free Hospital NHS Foundation TrustLondon NW32QGUnited Kingdom Department of Academic Surgery The Royal Marsden NHS Foundation TrustLondon SW36JJUnited Kingdom

Intrahepatic cholangiocarcinoma(iCCA)is an aggressive malignancy with an increasing incidence worldwide and poor prognosis,despite several advances and continuous efforts to develop effective *** surgical resection is the mainstay of treatment and offers a potentially curative option,but is only possible in less than a third of patients,owing to advanced *** is a well-established treatment in the adjuvant and palliative setting,however,confers limited *** radiotherapy is challenging due to local *** recent advances in stereotactic ablative radiotherapy(SABR),it is now possible to focus ablative beams of radiotherapy precisely aimed at tumours to minimise damage to surrounding *** review details the history,technical background and application of SABR to iCCA,with directions for future research suggested.

关键词： Cholangiocarcinoma Intrahepatic Stereotactic ablative radiotherapy Stereotactic body radiotherapy Radiotherapy Liver cancer hepatectomy

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