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Tubular Heat Enhancement Using Twisted Tape Inserts with Large Holes

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Energy Engineering 2024年第2期121卷 273-290页

作者： ali jaber abdulhamed Aws Al-Akam Wisam J.Khudhayer ali Sabri Allw Faculty of Engineering-Al-Mussayib University of BabylonHillaBabylon15001Iraq

Heat augmentation techniques play a vital role in the heating and cooling processes in industries,including solar collectors and many applications that utilize heat *** studies are based on inserting fillers inside the tubes to enhance heat *** investigation considered the effects of twisted tapes with large holes on a tubular heat exchanger’s(HX)heat transmission,pressure drop,and thermal boosting *** the experimental section,counter-swirl flow generators used twisted tapes with pairs of 1.0 cm-diameter holes and changes in porosity(Rp)at 1.30%and 2.70%.In the experiments,air was utilized as a working fluid in a tube with a circular *** turbulent flow was considered,with Reynolds numbers(Re)domain from 4800 to 9500,and a boundary condition with a uniform wall heat flux was *** findings expound that when the number of holes rose,the Nusselt number(Nu),the factor of friction(f),and the thermal enhancement factor(η)all increased as ***,as the friction factor increased,the Nusselt number of the tape-equipped tube was noticeably ***,it was discovered that the friction factor was between 70%and 94%lower than the values of the tube without tape,while the(Nu)was between 87%and 97%higher than the conventional tube *** maximum value ofηis 89%.According to the experimental results,empirical correlations for Nu,f,andηwere also generated.

关键词： Tubular heat exchanger tape inserts twisted tape

Waste Heat Recovery from a Drier Receiver of an A/C Unit Using Thermoelectric Generators

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Energy Engineering 2023年第8期120卷 1729-1746页

作者： ali jaber abdulhamed Aws Al-Akam Ahmed A.Abduljabbar Mohammed H.Alkhafaji Energy Engineering Department Faculty of Engineering/AL-MussayibUniversity of BabylonHillaBabylonIraq Construction and Projects Department Al Iraqia UniversityBaghdadIraq Department of Electrical Engineering University of TechnologyBaghdadIraq

Thermoelectric generators(TEGs)are considered promising devices for waste heat recovery from various *** Seebeck effect can be utilized to generate power using the residual heat emitted by the filter dryer receiver(FDR)of an air conditioning(A/C)system,which would otherwise go to *** study aims to build a set of thermoelectric generators(TEG)to collect the waste heat of the FDR and generate low-power electricity.A novel electrical circuit with two transformers is designed and fabricated to produce a more stable voltage for operation and *** thermoelectric generator(TEGs)was installed on the FDR of the A/C *** test showed that climate conditions have a significant impact on the output power generated from the *** results showed that the peak voltage recorded in the current study is 5.2 V per day(wet,cold,and wind weather)with an output power of 0.2 *** values are acceptable for powering the load and charging a single battery with 3.5 V as the voltage increases battery 0.1 V/20 min charge.A case study of operating the emergency signs in a building was *** current heat recovery system is deemed to be easily installed and can be connected to a network of TEGs to produce more power.

关键词： Thermoelectric generator waste heat filter dryer receiver air conditioning heat recovery

MARIE:One-Stage Object Detection Mechanism for Real-Time Identifying of Firearms

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 279-298页

作者： Diana Abi-Nader Hassan Harb ali jaber ali Mansour Christophe Osswald Nour Mostafa Chamseddine Zaki Computer Science Department Faculty of SciencesLebanese UniversityBeirut146404Lebanon College of Engineering and Technology American University of the Middle EastEgaila54200Kuwait Lab-STICC CNRS UMR 6285ENSTA-BretagneBrest29200France

Security and safety remain paramount concerns for both governments and individuals *** today’s context,the frequency of crimes and terrorist attacks is alarmingly increasing,becoming increasingly intolerable to ***,there is a pressing need for swift identification of potential threats to preemptively alert law enforcement and security forces,thereby preventing potential attacks or violent *** advancements in big data analytics and deep learning have significantly enhanced the capabilities of computer vision in object detection,particularly in identifying *** paper introduces a novel automatic firearm detection surveillance system,utilizing a one-stage detection approach named MARIE(Mechanism for Realtime Identification of Firearms).MARIE incorporates the Single Shot Multibox Detector(SSD)model,which has been specifically optimized to balance the speed-accuracy trade-off critical in firearm detection *** SSD model was further refined by integrating MobileNetV2 and InceptionV2 architectures for superior feature extraction *** experimental results demonstrate that this modified SSD configuration provides highly satisfactory performance,surpassing existing methods trained on the same dataset in terms of the critical speedaccuracy *** these innovations,MARIE sets a new standard in surveillance technology,offering a robust solution to enhance public safety effectively.

关键词： Firearm and gun detection single shot multi-box detector deep learning one-stage detector MobileNet inception convolutional neural network

Kinetics of gadolinium extraction with D2EHPA and Cyanex301 using single drop column

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Rare Metals 2016年第6期35卷 487-494页

作者： Rezvan Torkaman Meisam Torab-Mostaedi jaber Safdari Mohammad ali Moosavian School of Chemical Engineering College of EngineeringUniversity of Tehran Nuclear Fuel Cycle Research School Nuclear Science and Technology Research Institute

The extraction kinetics of Gd（III） from the nitric acid medium using bis（2,4,4-trimethylpentyl） dithio- phosphinic acid （Cyanex301） and 2-ethylhexyl phosphoric acid （D2EHPA） in kerosene solution were measured by the single drop technique. The influences of hydrogen ion concentration, gadolinium ion concentration, extractant concentration, column height, and nozzle diameter on the extraction rate were investigated. The forward rate equations for the gadolinium extraction with D2EHPA and Cyanex301 were obtained. Based on the experimental results, the forward extraction rate constant was calculated. With the increase of D2EHPA or Cyanex301 concentration, the drop rising diameter and the value of interfacial tension decrease in the studied system, which shows that D2EHPA or Cyanex301 has interfacial activity as a kind of surfactant. Also, the droplet diameter and interfacial tension decrease with the increase of aqueous solution acidity. The experimental results show that the D2EHPA extractant provides faster extraction rate in comparison with Cyanex301 extractant, and it would be useful in industrial continuous extraction process.

关键词： Reaction kinetics Solvent extraction Single drop column Gadolinium Rare earths

A New Hybrid Feature Selection Method Using T-test and Fitness Function

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Computers, Materials & Continua 2021年第9期68卷 3997-4016页

作者： Husam ali Abdulmohsin Hala Bahjat Abdul Wahab Abdul Mohssen jaber Abdul Hossen Department of Computer Science Faculty of ScienceUniversity of BaghdadBaghdadIraq Faculty of Computer Science Technology UniversityBaghdadIraq Department of Computer Science Al-Turath University CollegeBaghdadIraq

Feature selection(FS)(or feature dimensional reduction,or feature optimization)is an essential process in pattern recognition and machine learning because of its enhanced classification speed and accuracy and reduced system *** reduces the number of features extracted in the feature extraction phase by reducing highly correlated features,retaining features with high information gain,and removing features with no weights in *** this work,an FS filter-type statistical method is designed and implemented,utilizing a t-test to decrease the convergence between feature subsets by calculating the quality of performance value(QoPV).The approach utilizes the well-designed fitness function to calculate the strength of recognition value(SoRV).The two values are used to rank all features according to the final weight(FW)calculated for each feature subset using a function that prioritizes feature subsets with high SoRV *** FW is assigned to each feature subset,and those with FWs less than a predefined threshold are removed from the feature subset *** are implemented on three datasets:Ryerson Audio-Visual Database of Emotional Speech and Song,Berlin,and Surrey Audio-Visual Expressed *** performance of the F-test and F-score FS methods are compared to those of the proposed *** are also conducted on a system before and after deploying the FS *** demonstrate the comparative efficiency of the proposed *** complexity of the system is calculated based on the time overhead required before and after *** show that the proposed method can reduce system complexity.

关键词： Feature selection dimensional reduction feature optimization pattern recognition classification t-test

Environmental Friendly Synthesis of Novel Isatin Ketal and Isatin Schiff Base Derivatives Using Michael Addition Reaction under Solvent-Free Conditions

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Chinese Journal of Chemistry 2012年第4期30卷 891-899页

作者： Imanzadeh,Ghotamhassan Soltanizadeh,Zahra Khodayari,ali Zamanloo,Mohammadreza Mansoori,Yagoub Salehzadeh,jaber Department of Chemistry Faculty of ScienceUniversity of Mohaghegh Ardabili56199-11367ArdabilIran

An efficient and simple procedure for the synthesis of novel isatin derivatives is described. Michael addition of aniline Schiff bases of isatin or p-toluidine Schiff bases of isatin to fumaric esters affords the Michael adduct com- pounds in good to high yields in the presence of K2CO3 and tetrabutylammonium bromide （TBAB） under sol- vent-free conditions. Repeating of this reaction about spiro[l,3-dioxolane-2,3＇-indol]-2＇（l＇H）-one, as a Michael do- nor, in the presence of 1,4-diazabicyclo[2.2.2]octane （DABCO） gives Michael adducts in remarkable yields under the same conditions.

关键词： Michael addition isatin ketal isatin Schiffbase fumaric ester acrylic ester solvent-free conditions

Improving methane storage on wet activated carbons at various amounts of water

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燃料化学学报 2012年第4期40卷 385-389页

作者： MOHAMMAD jaber DARABI MAHBOUB ali AHMADPOUR HAMED RASHIDI Department of Chemical Engineering Faculty of EngineeringFerdowsi University of Mashhad

Different mesoporous activated carbons were prepared by both chemical and physical activation processes and were examined for methane uptake in the presence of *** isotherms were obtained at wet condition by wetting samples with water at mass ratio of water/carbon(R) close to *** compare,the amount of methane storage were also measured at dry *** maximum amount of methane stored was attained as 237 V/V at R=1.0 by hydrate formation at the methane critical *** the next step,mass ratios of water/carbon were changed to investigate various amount of water for methane storage *** other values of mass ratio of water/carbon(R=0.8 and 1.4) were selected and methane isotherms were obtained at the same *** values of 210 and 248 V/V were reached for methane storage,*** was also observed that,in the pressure range lower than hydrate pressure,by increasing water ratio the hydrate formation pressure was decreased and methane uptake was much less than that of dry condition due to pore filling by water.

关键词： methane storage hydrate isotherm water wetting

An Efficient Method for Heat Recovery Process and Temperature Optimization

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Computers, Materials & Continua 2023年第4期75卷 1017-1031页

作者： Basim Kareem Naser Mohammed Dauwed Ahmed Alkhayyat Mustafa Musa jaber Shahad Alyousif Mohammed Hasan ali Dentistry Department Al-Mustaqbal University CollegeHilla51001Iraq Medical Instrumentation Techniques Engineering Dijlah University CollegeBaghdad00964Iraq College of Technical Engineering The Islamic UniversityNajaf54001Iraq Department of Medical Instruments Engineering Techniques Al-Turath University CollegeBaghdad10021Iraq Department of Medical Instruments Engineering Techniques Al-Farahidi UniversityBaghdad10021Iraq Research Centre University of MashreqBaghdad11001Iraq College of Engineering Department of Electrical&Electronic EngineeringGulf UniversityAlmasnad4363Kingdom of Bahrain Computer Techniques Engineering Department Faculty of Information TechnologyImam Ja’afarAl-Sadiq UniversityNajaf10023Iraq

Flue gas heat loss accounts for a significant component of theoverall heat loss for coal-fired boilers in power plants. The flue gas absorbsmore heat as the exhaust gas temperature rises, which reduces boiler efficiencyand raises coal consumption. Additionally, if the exhaust gas temperatureis too high, a lot of water must be used to cool the flue gas for the wetflue gas desulfurization system to function well, which has an impact onthe power plant’s ability to operate profitably. It is consequently vital totake steps to lower exhaust gas temperatures in order to increase boilerefficiency and decrease the amount of coal and water used. Desulfurizationperformance may be enhanced and water use can be decreased by reasonableflue gas characteristics at the entry. This study analyzed the unit’s energyconsumption, investment, and coal savings while proposing four couplingstrategies for regulating flue gas temperature and waste heat recovery. Agraded flue gas conditioning and waste heat recovery plan was presentedunder the condition of ensuring high desulfurization efficiency, along withthe notion of minimizing energy loss owing to energy inflow temperaturedifference. Numerical results show that the proposed methods improved thesystem performance and reduced the water consumption and regulated theboiler temperature.

关键词： Heat exchange system boiler energy optimization temperature control

Hemangioma in the lower labial vestibule of an eleven-year-old girl:A case report

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World Journal of Clinical Cases 2022年第5期10卷 1617-1622页

作者： Ashwag Yagoub Aloyouny Afrah jaber Alfaifi Shahad Mohammed Aladhyani Ahad ali Alshalan Hadeel Mohammed Alfayadh Hend Mahmoud Salem Department of Basic Dental Science Princess Nourah Bint Abdulrahman UniversityRiyadh 11671Saudi Arabia Oral Medicine Special Care Dentistry Prince Sultan Military Medical CityRiyadh 12211Saudi Arabia Department of Dentistry Ministry of HealthRiyadh 11176Saudi Arabia

BACKGROUND Hemangioma is a vascular benign tumour of endothelial *** appears commonly in the first decade of life with increases incidence in *** is not common to happen in the oral cavity and it is extremely rare to appear in the labial *** SUMMARY We present a case of an 11-year-old girl who complained of a painful,slowly growing mass which was consistent with the capillary hemangioma in the left mandibular *** tumor such as hemangioma in the mandibular vestibule is extremely rare;hence,the clinical definitive diagnosis is very ***,radiographic imaging and histopathologic analysis are crucial to reach to the final diagnosis for proper *** Comprehensive clinical evaluation,proper diagnostic imaging and microscopic analysis of the mass establish a precise diagnosis of the hemangioma for better management.

关键词： Capillary hemangioma Vascular malformation Labial vestibule Childhood Case report