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CFD investigation of the agitation in the desupersaturation during the wet-process phosphoric acid(WPPA)process

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Chinese Journal of Chemical Engineering 2020年第8期28卷 2064-2074页

作者： Asmaa Hadane Lhachmi Khamar saad Benjelloun Abderrahman Nounah Mohammed Khamar LGCE Higher School of Technology in SaléMohammed V University in RabatMorocco MSDA Mohammed 6th Polytechnic UniversityBenguerir 43150Morocco LIPIM National School of Applied sciences in KhouribgaSultan Moulay Sliman University in Beni MellalMorocco

Desupersaturation is a complex cooling operation that involves hy.rody.amic,thermal and mechanical *** process requires continuous agitation to avoid fouling problems and sludge *** current work aims to investigate the well mixedness in the desupersaturation tank for optimal *** this purpose,a multi-fluid CFD study.was conducted based on the Euler–Euler modeling approach,considering a multiphase flow involving a liquid phase(phosphoric acid)and a poly.dispersed solid phase,i.e.a sludge with three different sizes where each size is considered as a separate ***,the hy.rody.amic behavior of the flow within the agitated desupersaturator is analy.ed through the investigation of the velocity.fields as well as the power and pumping numbers,to determine both the agitator capacity.to pump the flow and its power consumption during the ***,in order to assess the mixture homogeneity.we evaluated the solid suspension in the desupersaturation reactor following conventional methods and two new proposed methodologies:the first approach is to evaluate the suspension quality.in the mixing sy.tem by.compartment and the second consists on the assessment of the uniform convergence of the solid ***,we calculated the time required to achieve a full suspension at different solid *** other hand,we conducted a detailed analy.is of the solid distribution dependency.on the impeller rotational speed at different solid volume fraction,which allows a good understanding of the parameters controlling the homogenization in the desupersaturator.

关键词： CFD Multiphase flow Mass transfer Phosphoric acid Agitation

Current experimental models, assessment and dietary.modulations of intestinal permeability.in broiler chickens

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Animal Nutrition 2021年第3期7卷 801-811页

作者： saad Gilani Peter V.Chry.tal Reza Barekatain Danisco Animal Nutrition(IFF) Oegstgeestthe Netherlands Baiada Poultry.Pty.Ltd Pendle HillNSWAustralia South Australian Research and Development Institute Roseworthy CampusRoseworthySAAustralia School of Animal and Veterinary.Sciences Roseworthy CampusUniversity of AdelaideRoseworthySAAustralia

Maintaining and optimising the intestinal barrier(IB)function in poultry.has important implications for the health and performance of the *** a key.aspect of the IB,intestinal permeability.IP)is mainly.controlled by.complex junctional proteins called tight junction proteins(TJ)that link enterocy.es *** disruption of TJ is associated with increased gut leakage with possible subsequent impli-cations for bacterial translocation,intestinal inflammation,compromised health and performance of the *** considerable data being available for other species,research on IP in broiler chickens and in general avian species is still an understudied *** paper reviews the available literature with a specific focus on IP in broiler chickens with consideration given to practical factors affecting the IP,current assessment methods,markers and nutritional modulation of *** experimental models to induce gut leakage are discussed including pathogens,ry.-based diets,feed deprivation and stress-inducing agents such as exogenous glucocorticoids and heat *** various markers including fluorescein isothiocy.nate dextran,expression of TJ and bacterial translocation have been widely.utilized to study.IP,recent studies have identified a number of excreta biomarkers to evaluate intestinal integrity.in particular non-invasive *** the research on various nutrients and feed additives to potentially.modulate IP is still at an early.stage,the most promising outcomes are anticipated for probiotics,prebiotics,amino acids and those feed ingredients,nutrients and additives with anti-inflammatory.*** research gaps are identified for the mechanistic mode of action of various nutrients to influence IP under different experimental *** modulation of IP through various strategies(*** manipulation of diet)may.be regarded as a new frontier for disease prevention and improving the health and performance of poultry.particul

关键词： Intestinal barrier function Permeability Tight junction protein Gut leakage model

Sepsis during short bowel sy.drome hospitalizations:Identify.ng trends,disparities,and clinical outcomes in the United States

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World Journal of Gastrointestinal Pathophy.iology 2024年第1期15卷 26-36页

作者： Dushy.nt Singh Dahiy. Jennifer Wachala Shantanu Solanki Dhanshree Solanki Asim Kichloo Samantha Holcomb Uvesh Mansuri Khwaja saad Haq Hassam Ali Manesh Kumar Gangwani y.sh R Shah Teresa Varghese Hafiz Muzaffar Akbar Khan Simon Peter Horslen Thomas D Schiano Sy.d-Mohammed Jafri Division of Gastroenterology Hepatology&MotilityThe University of Kansas School of MedicineKansas CityKS 66160United States Department of Internal Medicine Samaritan Medical CenterWatertownNY 13601United States Division of Gastroenterology.Hepatology.Nutrition The University of Texas MD Anderson Cancer CenterHoustonTX 77030United States Department of Medicine Institute for Foreign Medical Graduate EducationHoustonTX 77030United States Department of Internal Medicine MedStar Harbor HospitalBaltimoreMD 21225United States Department of Internal Medicine WellStar Spalding Regional HospitalGriffinGA 30224United States Division of Gastroenterology Hepatology and NutritionEast Carolina University/Brody School of MedicineGreenvilleNC 27858United States Department of Gastroenterology.and Hepatology University of Arkansas for Medical SciencesLittle RockAR 72205United States Department of Internal Medicine Trinity Health Oakland/Wayne State UniversityPontiacMI 48341United States Division of Gastroenterology.and Hepatology SUNY Upstate Medical UniversitySyracuseNY 13210United States Department of Pediatrics School of Medicine and UPMC Children’s Hospital of PittsburghUniversity of PittsburghPittsburghPA 15219United States Division of Liver Diseases Icahn School of Medicine at Mount SinaiNew YorkNY 10029United States Division of Gastroenterology.and Hepatology Henry Ford HospitalDetroitMI 48202United States

BACKGROUND Short bowel sy.drome(SBS)hospitalizations are often complicated with *** is a significant paucity.of data on adult SBS hospitalizations in the United States and across the *** To assess trends and outcomes of SBS hospitalizations complicated by.sepsis in the United *** The National Inpatient Sample was utilized to identify.all adult SBS hospitalizations between *** study.cohort was further divided based on the presence or absence of *** were identified,and hospitalization characteristics and clinical outcomes were *** of mortality.for SBS hospitalizations complicated with sepsis were *** Of 247097 SBS hospitalizations,21.7%were complicated by.*** SBS hospitalizations had a rising trend of hospitalizations from 20.8%in 2005 to 23.5%in 2014(P trendy.8.5%vs 1.4%,Py.16.1 d vs 7.7 d,Py.unger age,female gender,White race,and presence of comorbidities such as anemia and depression were identified to be independent predictors of inpatient mortality.for septic SBS *** Septic SBS hospitalizations had a rising trend between 2005-2014 and were associated with higher inpatient mortality.compared to non-septic SBS hospitalizations.

关键词： Short bowel sy.drome Sepsis Outcomes Mortality Trends

CNTs/CNF-supported multi-active components as highly.efficient bifunctional oxy.en electrocataly.ts and their applications in zincair batteries

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Nano Research 2023年第4期16卷 4793-4802页

作者： Weiy.an Ding Ali saad y.chen Wu Zhiwei Wang Xiuting Li Institute for Advanced Study Shenzhen UniversityShenzhen 518060China College of Phy.ics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China

Rational construction of active components has been the biggest challenge in preparing efficient bifunctional oxy.en ***,electrospinning and chemical vapor deposition(CVD)were employ.d to embed active species including FeCo nanoparticles,MNx(M=Fe,Co),and FePx in porous and graphitized carbon nanotubes(CNTs)/carbon nanofiber(CNF).The as-prepared FeCo@CoNx@FePx/C exhibited a half-wave potential as high as 0.86 V in oxy.en reduction reaction(ORR)and low oxy.en evolution reaction(OER)overpotential of 368 mV at 10 mA·cm^(−2),which are superior to Pt/C(0.83 V)and IrO_(2)(375 mV)*** assembled Zn-air battery.ZAB)showed a high energy.efficiency.Edischarge/Echarge)of 65%at 20 mA·cm^(−2)and stabilized for 700 charge-discharge *** spectroscopic and microscopic characterizations evidenced that the outstanding bifunctionality.of the electrocataly.t can be ascribed to three main reasons:First,FeCo nanoparticles are rich in MOH/MOOH active sites for OER,and FePx/CNTs constructed with CVD also modulate electronic structure to improve electron transfer;second,both MNx in carbon matrix and FePx/CNTs are highly.active towards ORR;third,the CNTs/CNF are highly.porous and graphitized,which promotes mass transport and improves electrical conductivity.and stability.of the *** work gives important implications on the design of bifunctional electrocataly.ts.

关键词： carbon nanotubes(CNTs)/carbon nanofiber(CNF)-supported multi-active components oxy.en reduction reaction oxy.en evolution reaction zinc-air battery

Theoretical evaluation of dielectric materials for lightning energy.harvesting sy.tem

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Clean Energy 2022年第6期6卷 869-878页

作者： saad Uddina Jinan Gua Muhammad Ajmal School of Mechanical Engineering Jiangsu UniversityZhenjiang 212013China School of Agricultural Equipment Engineering Jiangsu UniversityZhenjiang 212013China

This study.describes the hy.othetical approach to sy.tem design to collect and store electrical energy.present in a flash of *** sy.tem’s operations include the attraction and handling of the electrical charge obtained from lightning *** differences arise from three different dielectric materials(rutile,mica and quartz)and the results define the estimated response of the storage sy.tem,including charge *** the results in this article were obtained through simulation or demonstrated mathematically.showing the estimated outcomes of the *** findings demonstrate that each dielectric material has its own advantages and disadvantages that influence the efficiency.of the storage *** analy.ing the distinction of the three materials,it is observed that mica is the most suitable dielectric material,as it has the greatest dielectric strength,which is the main factor in the handling of charge.

关键词： lightning energy capacitor design harvesting sy.tem renewable energy

Artificial Intelligence Techniques Based Learner Authentication in Cy.ersecurity.Higher Education Institutions

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Computers, Materials & Continua 2022年第8期72卷 3131-3144页

作者： Abdullah saad AL-Malaise AL-Ghamdi Mahmoud Ragab Information Sy.tems Department Faculty of Computing and Information Technology King Abdulaziz UniversityJeddah21589Saudi Arabia Information Technology.Department Faculty of Computing and Information TechnologyKing Abdulaziz UniversityJeddah21589Saudi Arabia Centre of Artificial Intelligence for Precision Medicines King Abdulaziz UniversityJeddah21589Saudi Arabia Mathematics Department Faculty of ScienceAl-Azhar UniversityNaser City11884CairoEgypt

Education 4.0 is being authorized more and more by.the design of artificial intelligence(AI)*** education institutions(HEI)have started to utilize Internet technologies to improve the quality.of the service and boost *** to the unavailability.of information technology.IT)infrastructures,HEI is vulnerable to *** authentication can be used to authenticate a person based on biological features such as face,fingerprint,iris,and so *** study.designs a novel search and rescue optimization with deep learning based learning authentication technique for cy.ersecurity.in higher education institutions,named SRODLLAC *** proposed SRODL-LAC technique aims to authenticate the learner/student in HEI using fingerprint ***,the SRODLLACtechnique designs a median filtering(MF)based preprocessing approach to improving the quality.of the *** addition,the Densely.Connected Networks(DenseNet-77)model is applied for the extraction of ***,search and rescue optimization(SRO)algorithm with deep neural network(DNN)model is utilized for the classification ***,template matching process is done for fingerprint identification.A wide range of simulation analy.es is carried out and the results are inspected under several *** experimental results reported the effective performance of the SRODL-LAC technique over the other methodologies.

关键词： Cy.ersecurity authentication biometrics security higher education institution deep learning

Assessing workability.of greased bearings after long-term storage

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Friction 2019年第5期7卷 489-496页

作者： Michael VARENBERG y.ri KLIGERMAN Grigory.HALPERIN saad NAKAD Hay.am KASEM George W.Woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlantaGA30332USA Department of Mechanical Engineering Technion-Israel Institute of TechnologyHaifa32000Israel Department of Mechanical Engineering Azrieli College of EngineeringJerusalem9103501Israel

Here, we developed a technique to assess the workability.of sealed-for-life greased rolling bearings after a long-term storage. In this framework, we devised a model of equivalent transition between the conditions of natural ageing under daily.and seasonally.fluctuating temperature, and the conditions of accelerated thermal ageing at a constant high temperature. The tested bearings were thermally.aged, and then their steady.state friction and outer ring temperature were examined in a custom high-speed spindle. These results were compared to the performance of a reference new bearing tested under the same loading conditions. Our findings suggest that long-term storage can significantly.degrade the performance of sealed-for-life greased rolling bearings. However, a proper running-in can substantially.deter the ageing-driven degradation of the bearings.

关键词： grease lubrication ball bearings thermal ageing lubricant degradation

Hy.rogen FBG Sensor Using Pd/Ag Film With Application in Propulsion Sy.tem Fuel Tank Model of Aerospace Vehicle

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Photonic Sensors 2014年第3期4卷 254-264页

作者： Said saad Lotfi HASSINE Vassim ELFAHEM Group of Electronics and Quantum Phy.ics Laboratory of Advanced Materials and Quantum Phenomena Faculty ofSciences of Tunis 2092 Tunisia National Institute of Applied Sciences and Technology University of Carthage North Urban Center of Tunis-B.P. 676Cedex Tunis 1080 Tunisia Regio iT Gesellschaft mit beschrankter Hafiung Aachen Germany

The high efficiency.hy.rogen fiber Bragg grating （FBG） sensor is presented. The sensitive film was a new alliance of palladium-silver （Pd-Ag）. In addition, the titanium （Ti） lay.r was used as the adhesive lay.r. The presented sensor showed the resolution of more than 60pm/1%H2, and a fast response time of4s - 5s was guaranteed in the 0.1%H2 - 4%H2 range. Moreover, the life time of the sensor was investigated. The obtained results showed that the sensor had an enhanced life time. Furthermore, the sensor was applied in the propulsion sy.tem fuel tank model of the aerospace vehicle. The obtained results indicated that it is a prevention sy.tem against the disaster aerospace due to hy.rogen leakage.

关键词： Hy.rogen fiber Bragg grating palladium-silver faster response time propulsion sy.tem fuel tank prevention sy.tem hy.rogen leakage

Silicon mediated sy.thesis and selected transformations of β-chloroketones

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Chinese Chemical Letters 2011年第10期22卷 1171-1174页

作者： Tarek A.Salama saad S.Elmorsy Chemistry.Department Faculty of ScienceMansoura University35516 MansouraEgypt Chemistry.Department Faculty of EducationAmran UniversityAmranYemen

A combination of tetrachlorosilane（TCS） and phenol in dichloromethane was found to be an efficient reagent for hy.ro-chlorination ofα,β-unsaturated ketones to afford the correspondingβ-chloroketones in good y.eld at ambient temperature. Reactions of the titled compounds with TCS-NaN_3 as well as with nitriles utilizing TCS-ZnCl_2 to give 1,5-disubstituted tetrazole derivatives orβ-amido ketones respectively.are also described.

关键词： Tetrachlorosilane Phenol β-Chloroketones Sy.thesis Tetrazoles β-Amido ketones