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Multiple Phase Change Materials for Performance Enhancement of a Solar Dryer with Double Pass Collector

Energy Engineering 2021年第5期118卷 1483-1497页

作者： Ahmed J.hamad Fawziea M.Hussien Johain J.Faraj Engineering Technical College Middle Technical UniversityBaghdadIraq

The fluctuation in drying temperature influences the food products’quality and drying time significantly during the drying process using an indirect solar *** of the effective methods to reduce these variations in the temperature is based on thermal storage materials to control the drying *** experimental investigation is presented in this study to evaluate the performance of an indirect solar dryer with air double pass using multiple phase change materials(PCM)as thermal storage *** PCMs with different melting points are used to store the available heat energy during peak sunshine periods and reduce the drying temperature *** tests on a food product sample are conducted in three cases,the first was without PCMs using natural *** second and third cases are based on forced convection with and without using multiple PCMs under Baghdad city *** results showed that;approximately a steady temperature of hot drying air was obtained during relatively low ambient temperatures when the dryer was incorporated with multiple *** drying time of the product sample for the natural,forced convection without PCMs and forced with PCMs was 87,72 and 47 h,*** higher performance of the dryer was for the forced convection with *** reduction percentage in drying time was about 17.2%and 46%for the forced convection without and with PCMs respectively compared with natural *** average drying rate for the natural,forced without PCMs and forced convection with PCMs was 0.0093,0.0135 and 0.0172 kg/h,*** enhancement in thermal efficiency of the solar collector and drying chamber with multiple PCMs was 43%and 25.5%,respectively,compared with a typical solar dryer.

关键词： Solar dryer double pass indirect dryer multiple PCM drying rate

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Salt Specific Interaction Between RepresentativeHofmeister Salts and Glycine

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光谱学与光谱分析 2020年第S1期40卷 235-236页

作者： hamad Ashraf GUO Ya-xin ZHANG Yun-hong The Institute of Chemical Physics School of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China

Traditionally,Hofmeister effect was understood on the basis of hydration abilities of *** studies found short-range structuring effects of ions on water which shifted the attention from ion-water interaction to ion-protein *** this study,ATR-FTIR spectroscopy at different RH is used to study the effect of a representative Kosmotrope(MgSO4),Chaotrope(NH4NO3)and neutral(KCl)salt on *** salting out,salting in and neutral effects of salts on glycine are found aligned with Hofmeister ***,direct interaction of kosmotrope anion(SO2-4)with the glycine is observed experimentally which validates the recent idea of ion-protein *** detailed studies will be needed for deeper insight.

关键词： Hofmeister effect Ion-protein interaction

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Insight into appropriate medication prescribing for elderly in the COVID-19 era

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World Journal of Clinical Cases 2022年第32期10卷 12056-12058页

作者： Amr S omar Rasha Kaddoura Department of Cardiothoracic Surgery Hamad Medical CoporationDoha 3050Qatar Department of Critical Care Medicine Beni Suef Faculty of MedicineBeni Suef 62511Egypt Department of Medicine Weill Cornell Medical Center in QatarDoha 3050Qatar Department of Pharmacy Heart HospitalHamad Medical CorporationDoha 3050Qatar

Coronavirus disease 2019(COVID-19)complicates clinical management in elderly *** is an additional need to properly treat and monitor elderly COVID-19 *** paper discusses the inappropriate medication prescribing in the... 详细信息

关键词： Atrial fibrillation Beta blockers COVID-19 Elderly

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Synthesis of different-sized gold nanostars for Raman bioimaging and photothermal therapy in cancer nanotheranostics

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中国科学：化学英文版 2017年第9期60卷 1219-1229页

作者： Jie Gao Maria Sanchez-Purra Hao Huang ShunhaoWang Yunan Chen Xuefeng Yu Qian Luo Kimberly hamad-Schifferli Sijin Liu State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences.Beijing 100049 China Department of Engineerfng University of Massachusetts BostonBostonMA 02125United States Institute of Biomedicine and Biotechnology Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Department of Mechanical Engineering Massachusetts Institute of TechnologyCambridgeMA 02139United States

Gold nanoparticles(AuNPs) have been attractive for nanomedicine because of their pronounced optical ***,we customerized the methods to synthesize two types of gold nanostars,Au nanostars-1 and Au nanostars-2,which have different spire lengths and optical properties,and also spherical *** to nanospheres,gold nanostars were less toxic to a variety of cells,including *** nanostars-1 and Au nanostars-2 also manifested a similar pattern of tissue distribution upon in vivo administration in mice to that of nanospheres,and but reveled less liver retention than *** to their strong absorption in the near-infrared(NIR),Au nanostars-2 induced a strong hyperthermia effect in vitro upon excitation at 808 nm,and elicited a robust photothermal therapy(PTT) efficacy in ablating tumors in a mouse model of orthotopic breast cancer using 4T1 breast cancer ***,Au nanostars-1 showed a great capability to enhance the Raman signal through surface-enhanced Raman spectroscopy(SERS) in 4T1 *** combined results opened a new avenue to develop Au nanostars for cancer imaging and therapy.

关键词： gold nanoparticle, nanostar, surface plasmon resonance, tissue distribution, toxicity profile

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Differential diagnosis between autism spectrum disorder and other developmental disorders with emphasis on the preschool period

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世界儿科杂志:英文版 2023年第8期19卷 715-726页

作者： Taynara Amancio de Lima Patricia Aparecida Zuanetti Marina Estima Neiva Nunes Ana Paula Andrade hamad Department of Neurosciences and Behavioral Sciences Ribeirão Preto Medical SchoolUniversity of São PauloAv.Bandeirantes3900Monte AlegreRibeirão PretoSP14049-900Brazil University Hospital Ribeirão Preto Medical SchoolUniversity of São Paulo(HCFMRP-USP)Ribeirão PretoSPBrazil

Background Neurodevelopmental disorders are a heterogeneous group of conditions that manifest as delays or deviations in the acquisition of expected developmental milestones and behavioral *** spectrum disorder(ASD)is a neurodevelopmental disorder characterized by deficits in communication and social interaction and by repetitive and restricted patterns of behavior,interests and *** aim of this review is to discuss the clinical features of the differential diagnoses of ASD that are prevalent among preschoolers,focusing on their similarities and *** sources The international medical literature search was conducted using PubMed and was revised regarding the subject using single and/or combined keywords as follows:differential diagnosis,preschoolers,diagnostic challenge,attention deficit hyperactivity disorder,intellectual disability,high abilities/giftedness,childhood apraxia of speech,social communication disorder,Landau–Kleffner syndrome,stereotyped movement disorder and excessive screen *** We describe conditions commonly found in clinical practice,taking ASD as a *** addressed converging and divergent aspects of behavior,cognition,communication,language,speech,socialization,and stereotypes for the diagnosis of ASD and other disorders identified as potential differential or comorbid *** The ranking and characterization of symptoms appear to be essential for better understanding the underlying common ground between children with developmental disorders and children with ASD,thus properly diagnosing and directing social,professional,or medication *** detailed discussion adds to the literature since,although ASD differential diagnoses are frequently mentioned and discussed in textbooks and journal articles,they rarely occupy a prominent place as we aimed herein.

关键词： Autism spectrum disorder Clinical features Differential diagnosis Neurodevelopmental disorders Preschool

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A New Hybrid System Design for Thermal Energy Storage

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Journal of Thermal Science 2020年第5期29卷 1300-1308页

作者： CEYLA Ilhan ALI Ismail hamad Guma ERGUN Alper GUREL Ali Etem ACAR Bahadir iSLAM Nurse Department of Energy Systems Engineering Faculty of TechnologyKarabtik UniversityKarabik 78050Turkey Department of Mechanical and Manufacturing Engineering Faculty of TechnologyDuzce UniversityDtizce 81620Turkey

Due to some serious environmental problems like global warming and greenhouse effect,studies on solar energy systems are being conducted all over the *** studies conducted in recent years are on hybrid designs in which solar energy systems can realize both electricity and heat production at the same *** this way,both electrical energy and heat energy can be generated from the same system In this study,the design and analysis of a concentrated solar air collector with a heat storage unit were carried *** the solar air collector,heat energy was depot in paraffin wax,and the electrical energy which was stored in the battery using the PV(photovoltaic)modules in the system enabled the operation of the system *** experiments which aimed at determining system performance were carried out in winter when the ambient temperature was *** experiments were performed with or without a heat storage unit,and a comparative analysis was *** was found that the temperature of the air released from the collector ranged from 15°C to 40°C when the exterior temperature was-5°*** average efficiency of the concentrated system without the heat storage unit was calculated as 67%.The average efficiency of the concentrated system with the heat storage unit was calculated as 96%.

关键词： heat storage phase change material concentrated solar air collector

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Intelligent Traffic Surveillance through Multi-Label Semantic Segmentation and Filter-Based Tracking

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Computers, Materials & Continua 2023年第9期76卷 3707-3725页

作者： Asifa Mehmood Qureshi Nouf Abdullah Almujally Saud S.Alotaibi Mohammed hamad Alatiyyah Jeongmin Park Department of Creative Technologies Air UniversityIslamabad44000Pakistan Department of Information Systems College of Computer and Information SciencesPrincess Nourah bint Abdulrahman UniversityP.O.Box 84428Riyadh11671Saudi Arabia Information Systems Department Umm Al-Qura UniversityMakkahSaudi Arabia Department of Computer Science College of Sciences and Humanities in AflajPrince Sattam Bin Abdulaziz UniversityAl-KharjSaudi Arabia Department of Computer Engineering Tech University of KoreaSiheung-siGyeonggi-do15073Korea

Road congestion,air pollution,and accident rates have all increased as a result of rising traffic density andworldwide population *** the past ten years,the total number of automobiles has increased significantly over the *** this paper,a novel method for intelligent traffic surveillance is *** proposed model is based on multilabel semantic segmentation using a random forest classifier which classifies the images into five *** improve the results,mean-shift clustering was applied to the segmented ***,the pixels given the label for the vehicle were extracted and blob detection was applied to mark each *** the validation of each detection,a vehicle verification method based on the structural similarity index is *** tracking of vehicles across the image frames is done using the Identifier(ID)assignment technique and particle ***,vehicle counting in each frame along with trajectory estimation was done for each *** proposed system demonstrated a remarkable vehicle detection rate of 0.83 over Vehicle Aerial Imaging from Drone(VAID),0.86 over AU-AIR,and 0.75 over the Unmanned Aerial Vehicle Benchmark Object Detection and Tracking(UAVDT)dataset during the experimental *** proposed system can be used for several purposes,such as vehicle identification in traffic,traffic density estimation at intersections,and traffic congestion sensing on a road.

关键词： Traffic surveillance multi-label segmentation random forest particle filter computer vision

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Lack of Syndecan-1 produces significant alterations in whole-body composition, metabolism and glucose homeostasis in mice

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World Journal of Diabetes 2020年第4期11卷 126-136页

作者： Anil Kumar Jaiswal Mohanraj Sadasivam Susan Aja Abdel Rahim A hamad Department of Pathobiology Johns Hopkins UniversityBaltimoreMD 21205United States Department of Pathology Johns Hopkins UniversitySchool of MedicineBaltimoreMD 21205United States Department of Neuroscience Johns Hopkins UniversityBaltimoreMD 21205United States

BACKGROUND Obesity is a disease state with serious adverse metabolic complications,including glucose intolerance and type 2 diabetes that currently has no *** and understanding roles of various modulators of body composition and glucose homeostasis is required for developing effective ***-1(Sdc1) is a member of the heparan sulfate proteoglycan family that has mainly been investigated for its role in regulating proliferation and survival of epithelia and tumor cells,but little is known about its roles in regulating obesity and glucose *** To examine the role of Sdc1 in regulating body fat and glucose *** We used female wild type and Sdc1 knockout(Sdc1 KO) mice on BALB/c background and multiple *** measurements(rates of oxygen consumption,carbon dioxide production,respiratory exchange ratio and energy expenditure) were performed using an open-flow indirect calorimeter with additional features to measure food intake and physical *** intolerance and insulin resistance were measured by established tolerance test *** Although our primary goal was to investigate the effects of Sdc1 deficiency on body fat and glucose homeostasis,we uncovered that Sdc1 regulates multiple metabolic ***1 KO mice have reduced body weight due to significant decreases in fat and lean masses under both chow and high fat diet *** reduced body weight was not due to changes in food intakes,but Sdc1 KO mice exhibited altered feeding behavior as they ate more during the dark phase and less during the light phase than wild type *** addition,Sdc1 KO mice suffered from high rate of energy expenditure,glucose intolerance and insulin *** These results reveal critical multisystem and opposing roles for Sdc1 in regulating normal energy balance and glucose *** results will have important implications for targeting Sdc1 to modulate metabolic ***,we offe

关键词： Syndecan-1 High fat diet Indirect calorimetry Energy expenditure IL-17 Feeding pattern

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Temperature effect on the corrosion and passivation characterization of Ni_(82.3)Cr_7Fe_3Si_(4.5)B_(3.2) alloy in acidic media

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International Journal of Minerals,Metallurgy and Materials 2016年第2期23卷 205-214页

作者： Khadijah M.Emran Sanaa T.Arab Aisha M.Al-Turkustani hamad A.Al-Turaif Chemistry Department Faculty of Science Taibah University Department of Chemistry Faculty of Sciences Al-Faisaliah King Abdulaziz University Department of Chemical and Materials Engineering King Abdulaziz University

The effects of temperature on corrosion and the electrochemical behavior of Ni82.3Cr7Fe3Si4.5B3.2 glassy alloy in HC1,H2SO4,and H3PO4 acids were studied using AC and DC *** data reveal that the susceptibility to localized corrosion increases with increasing *** polarization curves reveal that the bulk glassy alloy is spontaneously passivated at all the investigated temperature in H2SO4 and H3PO4 solutions.A localized corrosion effect in HCl solution is clearly *** apparent activation energies in the regions of Tafel,active,and passive,as well as the enthalpies and entropies of the dissolution process were determined and *** high apparent activation energy（Ea） value for H3PO4 solution in Tafel region is explained by the low aggressivity of PO4^3- ions.

关键词： nickel alloys corrosion temperature effect acidic environment passivation polarization

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Preparation of quantum size of tin oxide: Structural and physical characterization

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Progress in Natural Science:Materials International 2016年第2期26卷 145-151页

作者： N.M.Shaalan D.hamad A.Y.Abdel-Latief M.A.Abdel-Rahim Physics Department Faculty of Science Assiut University

SnO2NPs were successfully prepared via a hydrothermal method. X-ray diffraction analysis con fi rmed the rutile tetragonal structure of SnO2NPs. The crystallite size increased from 1.18 to 5.06 nm with increasing the preparation temperature from 100 to 180 °C. The SEM photography of the products exhibited the agglomeration of the SnO2nanocrystals to large view particles, while TEM images con fi rmed the polycrystalline phase and crystallite size those analyzed from XRD. The UV–vis absorption of ethanol suspended SnO2NPs was measured. The optical band-gap energies（Eg） were signi fi cantly blue-shifted due to quantum con fi nement. Fluorescence spectra came to con fi rm this shift, where a clear shift in the maximum emission peak was observed. Stokes shift of SnO2nanocrystals was found to be crystallite size dependent.

关键词： Nanostructures Tin dioxide Luminescence Optical properties

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