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Synthesis, characterization and radioluminescence properties of erbium-doped yttria phosphors

International Journal of Minerals,Metallurgy and Materials 2021年第12期28卷 1983-1990页

作者： fatma unal Faruk Kaya Kursat Kazmanli Metallurgical and Materials Engineering Department Hitit UniversityCorum 19030Turkey Metallurgical and Materials Engineering Department Istanbul Technical UniversityMaslakIstanbul 34469Turkey

Radioluminescence(RL)behaviour of erbium-doped yttria nanoparticles(Y2O_(3):Er^(3+)NPs)which were produced by sol-gel method was reported for future scintillator *** with dopant rates of 1 at%,5 at%,10 at%and 20 at%Er were produced and calcined at 800℃,and effect of increased calcination temperature(1100℃)on the RL behaviour was also reported.X-ray diffraction(XRD)results showed that all phosphors had the cubic Y2O_(3) bixbyite-type *** lattice parameters,crystallite sizes(CS),and lattice strain values were calculated by Cohen-Wagner(C-W)and Williamson-Hall(W-H)methods,***,the optimum solubility value of the Er^(3+)dopant ion in the Y2O_(3) host lattice was calculated to be approximately 4 at%according to Vegard’s law,which was experimentally obtained from the 5 at%Er^(3+)ion containing *** peak shifts in XRD patterns and X-ray photoelectron spectroscopy(XPS)analyses confirmed that Er^(3+)dopant ions were successfully incorporated into the Y2O_(3) host ***-resolution transmission electron microscopy(HRTEM)results verified the average CS values and agglomerated NPs morphologies were *** electron microscopy(SEM)results showed the neck formation between the particles due to increased calcination *** a result of the RL measurements under a Cu KαX-ray radiation(wavelength,λ=0.154 nm)source with 50 kV and 10 mA beam current,it was determined that the highest RL emission belonged to 5 at%Er doped *** the RL emission spectrum,the emission peaks were observed in the wavelength ranges of 510-575 nm(2H11/2,4S3/2-4I15/2;green emission)and 645-690 nm(4F9/2-4I15/2;red emission).The emission peaks at 581,583,587,593,601,611 and 632 nm wavelengths were also *** was found that both dopant rate and calcination temperature affected the RL emission *** color shifted from red to green with increasing calcination temperature which was attributed to the increased crystallinit

关键词： structure. temperature. solution.

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Nickel accumulation and its effect on biomass,protein content and antioxidative enzymes in roots and leaves of watercress(Nasturtium officinale ***.)

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Journal of Environmental Sciences 2010年第4期22卷 526-532页

作者： Fatih Duman fatma Ozturk Faculty of Arts and Sciences Department of BiologyErciyes University

In order to understand its response towards nickel stress, watercress （Nasturtium officinale R. Br.） was exposed to nickel （1-25 mg/L） for 1, 3, 5 and 7 days. The accumulation and translocation of nickel were determined and the influence of nickel on biomass, protein content and enzymatic antioxidants was examined for both roots and leaves. It was determined that N. o fficinale could accumulate appreciable amounts of Ni in both roots and leaves. Nickel accumulated particularly in the roots of plants. Biomass increased at low nickel concentrations but certain measurable change was not found at high concentrations. Under stress conditions the antioxidant enzymes were up-regulated compared to control. An increase in protein content and enzyme activities was observed at moderate exposure conditions followed by a decline at both roots and leaves. The maximum enzyme activities were observed at different exposure conditions. Our results showed that N. officinale had the capacity to overcome nickel-induced stress especially at moderate nickel exposure. Therefore, N. officinale may be used as a phytoremediator in moderately polluted aquatic ecosystems.

关键词： nickel accumulation antioxidative enzymes biomass watercress

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BROWDER AND SEMI-BROWDER OPERATORS

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Acta Mathematica Scientia 2012年第3期32卷 942-954页

作者： fatma Fakhfakh Maher Mnif D'epartement de Math'ematiques Universit'e de SfaxFacult'e des Sciences de SfaxRoute de SoukraKm 3.5B.P.11713000 SfaxTunisie

In this article, we study characterization, stability, and spectral mapping the- orem for Browder＇s essential spectrum, Browder＇s essential defect spectrum and Browder＇s essential approximate point spectrum of clos... 详细信息

关键词： Browder and semi-Browder operators Browder's essential spectrum Browder's essential defect spectrum Browder's essential approximate point spectrum

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Structure and seismo-tectonic investigation of the Sar?g?l-Buldan region,Western Anatolia,by using gravity and seismicity data

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Journal of Mountain Science 2022年第10期19卷 2758-2775页

作者： ALTINOGLU fatma Figen POLAT Gulten Department of Geological Engineering Faculty of EngineeringPamukkale UniversityDenizli 20017Turkey Department of Civil Engineering Yeditepe UniversityKayisdagi Cad 34755IstanbulTurkey

The parameter b(commonly referred to as the b-value)is one of the most significant seismic parameters to describe the seismicity of an investigated *** this study,the structural framework of the Sar?g?l-Buldan region located in the intersection area of the western Anatolian graben system in Turkey was investigated by using seismicity and gravity *** known,western Anatolia is one of the most seismically active regions of the Anatolian ***,seismic activity in this region is very *** of the Bouguer gravity data enabled to define the shallow subsurface structure of the study *** from the gravity analysis indicated that the sediment basement depth varied from 0.1 km and 2.1 *** also detected many NW-SE,E-W,and NESW trending lineaments that may be faults or fractures,and the NW-SE trending the Denizli basin lies to the east of the Ala?ehir *** observed that the findings from this analysis seem compatible with the regional geological *** addition to this,the seismicity of the region was analyzed by using the frequency-magnitude distribution to find out the seismic hazard *** most useful way in the analysis of the seismic hazard studies is to reveal the location of the earthquake boundary,which produces devastating big seismic events because such studies make it possible to forecast the location of possible future earthquakes and improve seismic hazard *** b-value for this study region was estimated by using the maximum likelihood *** in the b-value were observed,which range from≈0.2 to 2.A higher b-value was detected in the Buldan horst and surrounding *** contrast to this,lower bvalues were observed in the northeast part of the interaction region between the Denizli and the Ala?ehir *** positive Bouguer anomaly values as high as+10 m Gal and low b-values in the north-eastern part of the study region were interpreted as indicating a thinner crustal *** comparison,negative Bouguer a

关键词： Bouguer Gravity Seismicity Stress bvalue the Sar?g?l-Buldan region

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Effect of acupressure on procedural pain before heel lancing in neonates

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Journal of Traditional Chinese Medicine 2021年第2期41卷 331-337页

作者： Tanju Oğul fatma Yilmaz Kurt Research Assistant RNMSNFaculty of Health SciencesPediatric Nursing DepartmentCanakkale Onsekiz Mart UniversityCanakkale 17020Turkey

OBJECTIVE:To investigate the effect of acupressure applied to UB60 and K3 acupuncture points in order to relieve the procedural pain caused by heel lancing blood sampling process in the term ***:The data were collected by using the Information Form and the Neonatal Infant Pain *** applied for 3 min before heel lancing blood sampling in the newborns in the experimental group(n=31).No intervention was applied to newborns in the control group(n=32).RESULTS:A significant difference was found between mean scores of the newborns in the control and acupressure group in favor of the acupressure group in terms of heart rate during and after the procedure,oxygen saturation before,during and after the procedure,duration of crying during and after the procedure(P<0.05).It was found that there was a significant difference between groups in terms of Neonatal Infant Pain Scale mean scores during(P=0.001)and after the procedure(P<0.05),and the difference was found to be in favor of the acupressure ***:As a result,acupressure was found to be an effective method in relieving pain caused by heel lancing blood sampling in newborns.

关键词： Acupressure Pain,procedural Infant,newborn Heel lancing blood sampling

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Toxicity, inheritance and biochemistry of clofentezine resistance in Tetranychus urticae

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Insect Science 2011年第5期18卷 503-511页

作者： Recep Ay fatma Ebru Kara Suleyman Demirel University Faculty of Agriculture Department of Plant Protection Cunur Isparta Turkey

This study evaluates the toxicological and biochemical response of two-spotted spider mites to clofentezine selection pressure. The mortality rate of Tetranychus urticae in adult females depends on increased clofentezine concentration and clofentezine was found to be effective against females. The resistance rate of the CUM strain selected 12 times once per generation with clofentezine was increased from 1.28- to 105.27-fold. The interaction of some synergists with clofentezine was analyzed in the clofentezine-resistant CLOF 12 strain. Synergists had no effect on clofentezine toxicity. The clofentezine-resistant CLOF 12 strain showed resistance against chlorpyrifos, abamectin, propargite, fenpyroximate and amitraz. The modes of inheritance of resistance to clofentezine were found to be incompletely dominant and not sex-linked. Esterase enzyme activity was detected both by gel electrophoresis and microplate reader methods, while glutathione S-transferase （GST） and monooxygenase （P450） activity were detected only by the microplate reader method. During the selection period the esterase, the GST and the P450 enzymes activities were raised from 7.69, 7.09 and 0.003 3 to 18.40, 13.11 and 0.003 7 milli-optical density/rain/rag proteins, respectively. An increase was observed in the band intensity of esterases and esterase enzymes may play a role in clofentezine resistance in T. urticae.

关键词： acaricide resistance clofentezine esterase glutathione S-transferase monooxygenase Tetranychus urticae

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Mechanical properties of vanadium-alloyed austempered ductile iron for crankshaft applications

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Frontiers of Mechanical Engineering 2023年第3期18卷 251-263页

作者： fatma BAYATA Süleyman Batuhan VATAN Department of Mechanical Engineering Istanbul Bilgi University34060 IstanbulTurkey

This study focused on the development of austempered ductile iron(ADI)with desirable combination of mechanical properties for crankshaft applications by the combined effect of vanadium(V)alloying and an optimized heat treatment *** produced unalloyed GGG60,0.15%V-alloyed GGG60(V-15),and 0.30%V-alloyed GGG60 samples were subjected to austenitizing at 900℃for 1 h and subsequent austempering processes at 250,300,and 350℃for 15,30,60,90,and 180 *** a result of these austempering processes,different bainitic structures were obtained,which led to the formation of diverse combinations of mechanical *** mechanical properties of the austempered samples were tested comprehensively,and the results were correlated with their microstructures and the stability of the retained austenite *** the microstructural observations,the V-alloyed samples exhibited a finer microstructure and a more acicular ferrite phase than unalloyed *** V addition delayed the coarsening of the acicular ferrite structures and considerably contributed to the improvement of the mechanical properties of ***,the X-ray diffraction results revealed that the retained austenite volume and the carbon enrichment of austenite phases in ADI samples were remarkably affected by the addition of *** increase in volume fraction of retained austenite and its carbon content provided favorable ductility and toughness to V-15,as confirmed by the elongation and impact test ***,the dual-phase ausferrite microstructure of V-15 that was austempered at 300℃for 60 min exhibited high strength with substantial ductility and toughness for crankshaft applications.

关键词： austempered ductile iron(ADI) vanadium alloying mechanical properties crankshafts retained austenite

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Event-Based Semantics of UML 2.X Concurrent Sequence Diagrams for Formal Verification

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Journal of Computer Science & Technology 2022年第1期37卷 4-28页

作者： Inès Mouakher fatma Dhaou J.Christian Attiogbé Faculty of Sciences of Tunis University of Tunis El Manar1068TunisTunisia Institute of Technology University of Nantes44322NantesFrance

UML 2.X sequence diagrams(SD)are among privileged scenarios-based approaches dealing with the complexity of modeling the behaviors of some current ***,there are several issues related to the standard semantics of UML 2.X SD proposed by the Object Management Group(OMG).They mainly concern ambiguities of the interpretation of SDs,and the computation of causal relations between events which is not specifically laid ***,SD is a semi-formal language,and it does not support the verification of the modeled *** justifies the considerable number of research studies intending to define formal semantics of UML *** proposed in our previous work semantics covering the most popular combined fragments(CF)of control-flow ALT,OPT,LOOP and SEQ,allowing to model alternative,optional,iterative and sequential behaviors *** proposed semantics is based on partial order theory relations that permit the computation of the precedence relations between the events of an SD with nested *** also addressed the issue of the evaluation of the interaction constraint(guard)for guarded CFs,and the related synchronization *** this paper,we first extend our semantics,proposed in our previous work;indeed,we propose new rules for the computation of causal relations for SD with PAR and STRICT CFs(dedicated to modeling concurrent and strict behaviors respectively)as well as their ***,we propose a transformational semantics in *** modeling approach emphasizes computation of causal relations,guard handling and transformational semantics into *** transformation of UML 2.X SD into the formal method Event-B allows us to perform several kinds of verification including simulation,trace acceptance,verification of properties,and verification of refinement relation between SDs.

关键词： UML 2.X sequence diagram formal semantics nested combined fragment partial order theory Event-B

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Qualitative Analysis of a Fractional Pandemic Spread Model of the Novel Coronavirus (COVID-19)

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Computers, Materials & Continua 2021年第1期66卷 843-869页

作者： Ali Yousef fatma Bozkurt Thabet Abdeljawad Department of Mathematics Kuwait College of Science and Technology27235Kuwait Department of Mathematics Erciyes UniversityKayseri38039Turkey Department of Mathematics and General Sciences Prince Sultan UniversityRiyadh11586Saudi Arabia Department of Medical Research China Medical UniversityTaichung40402Taiwan Department of Computer Science and Information Engineering Asia UniversityTaichungTaiwan

In this study,we classify the genera of COVID-19 and provide brief information about the root of the spread and the transmission from animal(natural host)to *** establish a model of fractional-order differential equations to discuss the spread of the infection from the natural host to the intermediate one,and from the intermediate one to the human *** the same time,we focus on the potential spillover of bat-borne *** consider the local stability of the co-existing critical point of the model by using the Routh–Hurwitz ***,we analyze the existence and uniqueness of the constructed initial value *** focus on the control parameters to decrease the outbreak from pandemic form to the epidemic by using both strong and weak Allee Effect at time ***,the discretization process shows that the system undergoes Neimark–Sacker Bifurcation under specific ***,we conduct a series of numerical simulations to enhance the theoretical findings.

关键词： Allee Effect coronavirus fractional-order differential equations local stability Neimark–Sacker bifurcation

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Castle architecture in Anatolia： Fortifications of Diyarbakir

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Frontiers of Architectural Research 2013年第2期2卷 209-221页

作者： fatma Meral Halifeosiu Department of Architecture Dicle University Diyarbakir 21280 Turkey

The ancient wails of Diyarbakir are the city＇s most important urban etement, exhibiting an artistic grace through the arrangement of the towers, architectural values, dimensions, materiats, and decorations. Diyarbakir is located at the crossroads of important trade routes, one connecting the Western World to the Far East and the other connecting North to South. Architecturally, its defensive waits and towers make it one of the most important surviving casttes. In this study, the history, location, architectural and building properties of fortifications of Diyarbakir were explained and technical dimensioning typology studies on towers and city watts were submitted.

关键词： Diyarbakir Fortifications ofDiyarbakir Castte Citadel Tower ptans Typotosy

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