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Using HF rather than nH_4F as doping source for spray-deposited SnO_2:F thin films

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Journal of Central South University 2012年第3期19卷 791-796页

作者： S.J.Ikhmayies r.n.ahmad-bitar Department of Basic Sciences-Physics Faculty of Information TechnologyAl Isra University Physics Department Faculty of ScienceUniversity of Jordan

Fluorine doped tin oxide SnO2：F thin films were prepared by the spray pyrolysis （SP） technique on glass substrates by using SnC12.2H2O as a precursor and nH4F and HF as doping compounds. A comparison between the properties of the films obtained by using the two doping compounds was performed by using I-V characteristics in the dark at room temperature, AC measurements, and transmittance. It is found that the films prepared by using HF have smaller resistivity, lower impedance and they are less capacitive than films prepared by using nH4F. In addition, these films have higher transmittance, higher optical bandgap energy and narrower Urbach tail width. These results are interesting for the use of SnO2：F as forecontact in CdS/CdTe solar cells.

关键词： CdS/CdTe solar cells transparent conducting oxides spray pyrolysis doping

rotating effects on the thermophysical properties of a two-dimensional GaAs quantum ring

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Communications in Theoretical Physics 2024年第6期76卷 165-173页

作者： ahmad Ghanbari Department of Physics College of ScienceYasouj UniversityYasoujIran

In this work,we have investigated the rotating effect on the thermodynamic properties of a 2D quantum ***,we have considered the radial potential of a 2D quantum ring and solved the Schrödinger equation in the presence of the Aharonov-Bohm effect and a uniform magnetic field for the considered *** to the solution of the equation,we calculated the eigenvalues and eigenfunctions of the considered *** the calculated energy spectrum,we obtained the partition function and thermodynamic properties of the system,such as the mean energy,specific heat,entropy and free *** results show that the rotating effect has a significant influence on the thermophysical properties of a 2D quantum *** also study other effects of the rotating term:(1)the effect of different values of rotating parameters,and(2)the effect of negative rotation on the thermodynamic properties of the *** results are discussed in detail.

关键词： Schrodinger equation quantum ring rotation effect thermophysical properties

Prevalence and risk factors associated with metabolic dysfunctionassociated steatohepatitis in patients with Helicobacter pylori infection: A population-based study

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World Journal of Hepatology 2024年第10期16卷 1169-1176页

作者： rashid Abdel-razeq Lynn bitar Elio r bitar Chidera Onwuzo Mohamad-noor Abu-Hammour Barish Eren Islam Mohamed Adejoke Johnson Antoine Boustany Somtochukwu Onwuzo Imad Asaad Department of Internal Medicine Cleveland Clinic FoundationClevelandOH 44111United States Faculty of Medicine Saint Joseph University of BeirutBeirut 11042020Lebanon Faculty of Medicine American University of BeirutBeirut 11072020Lebanon Department of Medicine&Surgery General Hospital Lagos IslandLagos Island 101223LagosNigeria Department of Internal Medicine Jacobi Medical Center/North Central Bronx HospitalBronxNY 10461United States Division of Gastroenterology Department of Internal MedicineUniversity of Florida College of MedicineJacksonvilleFL 32209United States Department of Gastroenterology Allegheny General HospitalPittsburghPA 15212United States Department of Gastroenterology Firelands HealthSanduskyOH 44870United States

BACKGrOUnD Helicobacter pylori(***)is associated with the development of gastrointestinal disorders ranging from gastritis to gastric *** evidence of the association between metabolic dysfunction-associated steatohepatitis(MASH)and *** infection in the literature is ***,we aim to evaluate the risk of developing MASH in patients who have had a diagnosis of *** infection independently of any confounding *** To evaluate the risk of developing MASH in patients who have had a diagnosis of *** *** This study used a validated multicenter research database of over 360 hospitals across 26 healthcare systems across the United States from 1999 to *** regression analysis assessed the risk of developing MASH,adjusting for confounders including *** infection,obesity,type 2 diabetes,hypertension,dyslipidemia,and male gender.A two-sided P valuensidered as statistically significant,and all statistical analyses were performed using r version 4.0.2(r Foundation for Statistical Computing,Vienna,Austria,2008).rESULTS A total of 79476132 individuals were screened in the database and 69232620 were selected in the final analysis after accounting for inclusion and exclusion ***(14.30%),patients with hyperlipidemia(70.35%),hypertension(73.86%),diabetes mellitus type 2(56.46%),and obese patients(58.15%)were more common in patients with MASH compared to *** a multivariate regression analysis,the risk of MASH was increased in diabetics[odds ratio(Or):3.55;95%CI:3.48-3.62],obese(Or:5.93;95%CI:5.81-6.04),males(Or:1.49;95%CI:1.46-1.52),individuals with hyperlipidemia(Or:2.43;95%CI:2.38-2.49)and *** infection(Or:2.51;95%CI:2.31-2.73).COnCLUSIOn This is the largest population-based study in the United States illustrating an increased prevalence and odds of developing MASH in patients with *** infection after adjusting for risk factors.

关键词： Metabolic dysfunction-associated steatohepatitis Metabolic dysfunction-associated steatotic liver disease Helicobacter Pylori Cirrhosis Liver

Unroofed coronary sinus,left-sided superior vena cava and mitral insufficiency:A case report and review of the literature

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World Journal of Cardiology 2024年第10期16卷 595-603页

作者： Fouad bitar Ziad Bulbul Yehya Jassar rana Zareef Jennifer Abboud Mariam Arabi Fadi Fouad bitar Department of Pediatric and Adolescent American University of Beirut Medical CenterBeirut 1103Lebanon Department of Surgery American University of Beirut Medical CenterBeirut 1103Lebanon

BACKGrOUnD Unroofed coronary sinus(UCS)is a rare subtype of atrial septal *** is frequently associated with a persistent left superior vena cava and is often part of a more intricate cardiac *** SUMMArY This report describes a rare case of an adolescent patient with UCS featuring atrial situs solitus,absence of the right superior vena cava and a persistent left superior vena cava draining into the left atrium consistent with total unroofing of the coronary *** was associated with concurrent severe mitral insufficiency secondary to redundant and prolapsing leaflets,and a substantial left-to-right shunt across the coronary sinus orifice.A comprehensive examination of the existing literature is included,shedding light on the diagnostic challenges of UCS and describing the available surgical options within the context of mitral valve *** UCS is a complex condition requiring careful consideration of associated anomalies and a tailored surgical approach.

关键词： Unroofed coronary sinus Mitral insufficiency Single left superior vena cava Surgical options Absent right superior vena cava Case report

Finite element model updating for structural damage detection using transmissibility data

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Earthquake Engineering and Engineering Vibration 2024年第1期23卷 87-101页

作者： ahmad Izadi Akbar Esfandiari Department of Maritime Engineering Amirkabir University of TechnologyTehran 15875-4413Iran

This paper presents a new finite element model updating method for estimating structural parameters and detecting structural damage location and severity based on the structural responses(output-only data).The method uses the sensitivity relation of transmissibility data through a least-squares algorithm and appropriate normalization of the extracted *** proposed transmissibility-based sensitivity equation produces a more significant number of equations than the sensitivity equations based on the frequency response function(FrF),which can estimate the structural parameters with higher *** abilities of the proposed method are assessed by using numerical data of a two-story two-bay frame model and a plate structure *** evaluating different damage cases,the number,location,and stiffness reduction of the damaged elements and the severity of the simulated damage have been accurately *** reliability and stability of the presented method against measurement and modeling errors are examined using error-contaminated *** parameter estimation results prove the method’s capabilities as an accurate model updating algorithm.

关键词： damage detection model updating output-only transmissibility sensitivity equation

Correlation between structural phase transition and physical properties of Co^(2+)/Gd^(3+)co-substituted copper ferrite

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Journal of rare Earths 2024年第7期42卷 1344-1353,I0006页

作者： Mohsen Choupani ahmad Gholizadeh School of Physics Damghan UniversityDamghan36716-45667Iran

The doping of the spinel ferrites with selective cations usually improves the properties of the parent *** effect of Co^(2+)/Gd^(3+)co-substitution on the microstructure,optical,and magnetic properties of Cu1-xCoxFe2-xGdxO4 prepared by the citrate-nitrate auto-combustion synthesis was *** of the samples was performed with powder X-ray diffraction(XrD),raman and Fouriertransform infrared(FTIr)spectroscopy,field-emission scanning electron microscopy,X-ray energydispersive spectroscopy,UV-Vis spectroscopy,and a vibrating sample *** results of XrD,raman,and FTIr analysis show a gradual structural phase transition from a tetragonal(I41/amd)structure to a cubic(Fd3m)*** bandgap energy of the studied samples is in a range of 1.57-1.75 eV with a minimum in sample x=0.06 and then *** investigations show that the presence of Co^(2+)/Gd^(3+)cations in an octahedral site of the copper ferrite structure could increase saturation magnetization and coercive field from 567.9 Oe and 23.62 emu/g to 929.4 Oe and 28.27 emu/g,respectively.

关键词： Spinel copper ferrite Citrate-nitrate method Structure phase transition Microstructure properties Magnetic properties rare earths

Efficient Communication in Wireless Sensor networks Using Optimized Energy Efficient Engroove Leach Clustering Protocol

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Tsinghua Science and Technology 2024年第4期29卷 985-1001页

作者： n.Meenakshi Sultan ahmad A.V.Prabu J.nageswara rao nashwan Adnan Othman Hikmat A.M.Abdeljaber r.Sekar Jabeen nazeer SrM Institute of Science and Technology KattankulathurChennai 603203India Department of Computer Science College of Computer Engineering and SciencesPrince Sattam Bin Abdulaziz UniversityAlkharj 11942Saudi Arabia University Center for research and Development(UCrD) Department of Computer Science and EngineeringChandigarh UniversityGharuanMohali 140413India Department of ECE Koneru Lakshmaiah Education FoundationVaddeswaramGuntur 522502India Department of Computer Science and Engineering Lakireddy Balireddy College of Engineering(A)NTR District 521230India Department of Computer Engineering College of EngineeringKnowledge UniversityErbil 44001Iraq Department of Computer Science Faculty of Information TechnologyApplied Science Private UniversityAmman 11937Jordan Department of Electronics and Communication Engineering(ECE) School of EngineeringPresidency UniversityBangalore 834001India

The Wireless Sensor network(WSn)is a network that is constructed in regions that are inaccessible to human *** widespread deployment of wireless micro sensors will make it possible to conduct accurate environmental monitoring for a use in both civil and military *** make use of these data to monitor and keep track of the physical data of the surrounding environment in order to ensure the sustainability of the *** data have to be picked up by the sensor,and then sent to the sink node where they may be *** nodes of the WSns are powered by batteries,therefore they eventually run out of *** energy restriction has an effect on the network life span and environmental *** objective of this study is to further improve the Engroove Leach(EL)protocol’s energy efficiency so that the network can operate for a very long time while consuming the least amount of *** lifespan of WSns is being extended often using clustering and routing *** Meta Inspired Hawks Fragment Optimization(MIHFO)system,which is based on passive clustering,is used in this study to do *** cluster head is chosen based on the nodes’residual energy,distance to neighbors,distance to base station,node degree,and node *** on distance,residual energy,and node degree,an algorithm known as Heuristic Wing Antfly Optimization(HWAFO)selects the optimum path between the cluster head and Base Station(BS).They examine the number of nodes that are active,their energy consumption,and the number of data packets that the BS *** overall experimentation is carried out under the MATLAB *** the analysis,it has been discovered that the suggested approach yields noticeably superior outcomes in terms of throughput,packet delivery and drop ratio,and average energy consumption.

关键词： wireless sensor networks energy efficient engroove leach protocol meta inspired Hawks fragment optimization heuristic wing antfly optimization

Evaluation of soil loss severity and ecological restoration approach for sustainable agriculture in the Hindu Kush, Karakoram and Himalaya region

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Journal of Mountain Science 2024年第5期21卷 1509-1521页

作者： Arshad ASHrAF Imr.n.ahmad Climate Energy and Water Research InstituteNational Agricultural Research Centre(NARC)Islamabad 44000Pakistan

Soil erosion has resulted in removal of the topsoils containing fine soil particles and plant nutrients, causing decrease in soil fertility in the Hindu Kush, Karakoram and Himalaya(HKH) region. The existing production of cereal crop grains has been reduced to one third of the potential crop grains production owing to land degradation and poor farming practices. It is necessary to assess risk of soil loss and identify appropriate controlling measures to address issues of low agriculture productivity and water insecurity in the region. In the present study, severity of soil loss was predicted using revised Universal Loss Equation(rUSLE) and ecological measures were identified for sustainable mountain agriculture in the HKH region of Upper Indus Basin, Pakistan. Overall 62.6% area was found to have very low risk of soil loss, i.e., r), 15.8% area low risk, i.e., 5-25 t/(ha·yr) and 7.5% area moderate risk, i.e., 25-50 t/(ha·yr) in the region. The risk was high, i.e., 50-100 t/(ha·yr) and very high, i.e., >100 t/(ha·yr) in about 6.8% and 7.4% areas respectively. The mean rate of soil loss was about 41.9 t/(ha·yr) in the Hindu Kush, 31.1 t/(ha·yr) in the Himalayas, 18.8 t/(ha·yr) in the Karakoram and overall 29.7 t/(ha·yr) in the three HKH ranges. As such no considerable measures have been adopted by the communities for restoration of the degraded areas except raising fruit/farm trees and supporting limited social forestry for their livelihoods. The slopes cleared for cultivation and susceptible to erosion may be stabilized through sowing/planting of multi-purpose plant species and formation of proper bench terraces. The conservation of forest ecosystem and pastures at higher elevations would help in reducing overland water flow, risk of flash flood hazard and minimizing sediment loads in the downstream. It is essential to adopt site-specific resource conservation techniques and restore possible ecosystem health for sustainable agriculture and economic developm

关键词： Climate change Erodibility Indus basin Land degradation Slope stabilization

Suppression and synchronization of chaos in uncertain time-delay physical system

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Applied Mathematics(A Journal of Chinese Universities) 2024年第3期39卷 416-437页

作者： Israr ahmad Muhammad Shafiq Department of Preparatory Studies Centre University of Technology and Applied SciencesNizwaOman Department of Electrical and Computer Engineering Sultan Qaboos UniversityOman

The mechanical horizontal platform(MHP)system exhibits a rich chaotic *** chaotic MHP system has applications in the earthquake and offshore *** article proposes a robust adaptive continuous control(rACC)*** investigates the control and synchronization of chaos in the uncertain MHP system with time-delay in the presence of unknown state-dependent and time-dependent *** closed-loop system contains most of the nonlinear terms that enhance the complexity of the dynamical system;it improves the efficiency of the *** proposed rACC approach(a)accomplishes faster convergence of the perturbed state variables(synchronization errors)to the desired steady-state,(b)eradicates the effect of unknown state-dependent and time-dependent disturbances,and(c)suppresses undesirable chattering in the feedback control *** paper describes a detailed closed-loop stability analysis based on the Lyapunov-Krasovskii functional theory and Lyapunov stability *** provides parameter adaptation laws that confirm the convergence of the uncertain parameters to some constant *** computer simulation results endorse the theoretical findings and provide a comparative performance.

关键词： chaotic horizontal platform system chaos suppression chaos synchronization robust adaptive control Lyapunov stability theory