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Corrosion resistance of powder injection moulded titanium in physiologic serum and artificial saliva

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Acta Metallurgica Sinica(English Letters) 2010年第3期23卷 197-205页

作者： S.candan M.Turkmen H.Ahlatci E.candan Department of Metals Karabuk University

Most of dental implants are made from titanium or titanium based ***, one of the drawback of such implants is high cost due to the technological difficulties in casting method or *** this work, powder injection moulding（PIM） method has been used in order to explore lower cost implants without minimising the biocorrosion resistance of the *** resistance of titanium specimens, produced by powder injection moulding method（PIM-Ti）, in physiologic serum and artificial saliva was *** pure bulk Ti（CP-Ti） was used as control *** oxidation was also carried out to both PIMTi and CP-Ti *** and corrosion resistance were investigated using microhardness, X-ray diffraction（XRD）, scanning electron microscopy（SEM） and potentiodynamic polarization *** microstructure of PIM-Ti samples contained porosity as compared to CP-Ti control *** of PIM-Ti samples varied with varying applied load whereas it was free from applied load for CP-Ti control *** measurements and SEM analysis revealed that corrosion behaviour of PIM-Ti was reasonably as good as CP-Ti both in as-produced and oxidized conditions in physiologic serum and artificial saliva in spite of its porous structure.

关键词： Titanium Powder injection moulding Corrosion Oxidation

A Hybrid Multi-Hazard Susceptibility Assessment Model for a Basin in Elazig Province,Türkiye

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International Journal of Disaster Risk Science 2023年第2期14卷 326-341页

作者： Gizem Karakas Sultan Kocaman candan Gokceoglu Graduate School of Science and Engineering Hacettepe University06800BeytepeAnkaraTurkey Department of Geomatics Engineering Hacettepe University06800BeytepeAnkaraTurkey Department of Geological Engineering Hacettepe University06800BeytepeAnkaraTurkey

Preparation of accurate and up-to-date susceptibility maps at the regional scale is mandatory for disaster mitigation,site selection,and planning in areas prone to multiple natural *** this study,we proposed a novel multi-hazard susceptibility assessment approach that combines expert-based and supervised machine learning methods for landslide,flood,and earthquake hazard assessments for a basin in Elazig Province,Tü*** produce the landslide susceptibility map,an ensemble machine learning algorithm,random forest,was chosen because of its known performance in similar *** modified analytical hierarchical process method was used to produce the flood susceptibility map by using factor scores that were defined specifically for the area in the *** seismic hazard was assessed using ground motion parameters based on Arias intensity *** univariate maps were synthesized with a Mamdani fuzzy inference system using membership functions designated by *** results show that the random forest provided an overall accuracy of 92.3%for landslide susceptibility *** the study area,41.24%were found prone to multi-hazards(probability value>50%),but the southern parts of the study area are more *** proposed model is suitable for multi-hazard susceptibility assessment at a regional scale although expert intervention may be required for optimizing the algorithms.

关键词： Earthquakes Floods Fuzzy inference systems Landslides Multi-hazard susceptibility assessment Random forest Türkiye

OSCILLATION BEHAVIOR OF SOLUTIONS FOR EVEN ORDER NEUTRAL FUNCTIONAL DIFFERENTIAL EQUATIONS

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Applied Mathematics and Mechanics(English Edition) 2006年第10期27卷 1311-1320页

作者： T.candan Department of Mathematics Faculty of Art and Science Nigde UniversityNigde51200Turkey

Even order neutral functional differential equations are considered. Sufficient conditions for the oscillation behavior of solutions for this differential equation are presented. The new results are presented and some... 详细信息

关键词： neutral differential equations oscillations distributed deviating arguments

A comparative study on corrosion of Mg-Al-Si alloys

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Transactions of Nonferrous Metals Society of China 2017年第8期27卷 1725-1734页

作者： Sennur candan Ercan candan Department of Mechanical and Manufacturing Engineering Bilecik Seyh Edebali University Bilecik 11210 Turkey Department of Mechanical Engineering Avrasya University Trabzon 61200 Turkey

Corrosion behavior of various Mg-Al-Si alloys(AS11,AS21,AS41,AS61and AS91series),cast under the same coolingconditions and controlled alloying composition,was investigated *** microscopy and scanning electronmicroscopy were used for microstructural *** corrosion behavior was evaluated by immersion tests andpotentiodynamic polarization measurements in3.5%NaCl *** results from both immersion tests and the potentiodynamicpolarization measurements showed that marginal improvement in corrosion resistance was observed with2.0%Al(mass fraction)containing alloy(AS21)whereas Al addition above2.0%(AS41,AS61and AS91)deteriorated the corrosion resistance which wasattributed toβphase,acting as cathode,and the interruption of continuity of the oxide film on the surface of the alloys owing tocoarsenedβand Mg2Si phases.

关键词： Mg alloy AS series alloys microstructure corrosion

Comparative study on corrosion behaviors of Mg-Al-Zn alloys

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Transactions of Nonferrous Metals Society of China 2018年第4期28卷 642-650页

作者： Sennur candan Ercan candan Department of Mechanical and Manufacturing Engineering Bilecik Seyh Edebali University

A comparative study on corrosion behaviors of various Mg-Al-Zn alloys(AZ21,AZ41,AZ61 and AZ91 series,cast under same cooling conditions and controlled alloying composition)was carried *** electron microscopy(SEM)and X-ray diffraction(XRD)were used for microstructural *** corrosion behaviors were evaluated by immersion tests and potentiodynamic polarization measurements in 3.5%NaCl *** results showed that the influence of Al addition on corrosion resistance was more pronounced up to 4%(***41)above which its influence was at less *** deterioration of the corrosion resistance of the alloys,at higher Al contents,was attributed to the amount and morphology ofβ-Mg17Al12 intermetallics and the interruption of continuity of the oxide film on the surface of the alloys owing to coarsenedβintermetallics.

关键词： Mg alloy AZ series alloys casting corrosion

A Review on Sources,Extractions and Analysis Methods of a Sustainable Biomaterial:Tannins

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Journal of Renewable Materials 2024年第3期12卷 397-425页

作者： Antonio Pizzi Marie-Pierre Laborie Zeki candan LERMAB University of LorraineFaculty of SciencesBlvd des AiguillettesNancy54000France Chair of Forest Biomaterials Institute of Earth and Environmental SciencesUniversity of FreiburgFreiburgGermany Freiburg Materials Research Center Alberst Ludwig University of FreiburgFreiburg79104Germany Department of Forest Products Engineering Faculty of ForestryIstanbul UniversitySariyerIstanbul34473Turkey

Condensed and hydrolysable tannins are non-toxic natural polyphenols that are a commercial commodity industrialized for tanning hides to obtain leather and for a growing number of other industrial applications mainly to substitute petroleum-based *** are a definite class of sustainable materials of the forestry *** have been in operation for hundreds of years to manufacture leather and now for a growing number of applications in a variety of other industries,such as wood adhesives,metal coating,pharmaceutical/medical applications and several *** review presents the main sources,either already or potentially commercial of this forestry by-materials,their industrial and laboratory extraction systems,their systems of analysis with their advantages and drawbacks,be these methods so simple to even appear primitive but nonetheless of proven effectiveness,or very modern and *** constitutes a basic but essential summary of what is necessary to know of these sustainable *** doing so,the review highlights some of the main challenges that remain to be addressed to deliver the quality and economics of tannin supply necessary to fulfill the industrial production requirements for some materials-based uses.

关键词： Tannins flavonoids sources extraction methods analysis methods

Neutrophil-to-lymphocyte ratio in occlusive vascular diseases： the literature review of the past 10 years

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World Journal of Emergency Medicine 2016年第3期7卷 165-172页

作者： Egemen Kucuk Ibrahim Kocayigit candan Gunel Hasan Duzenli Department of Emergency Medicine Training and Research Hospital Sakarya University Sakarya 54000 Turkey Department of Cardiology Training and Research Hospital Sakarya University Sakarya 54000 Turkey Department of Anaesthesiology Training and Research Hospital Sakarya University Sakarya 54000 Turkey Department of Chest Diseases Training and Research Hospital Sakarya University Sakarya 54000 Turkey

BACKGROUND: This study aims to evaluate the results of studies investigating neutrophilto-lymphocyte ratio(NLR) and to identify the prognostic and diagnostic value of NLR in occlusive vascular ***: With the aim of identifying the studies related to NLR, a search was performed on http://***/pubmed by using the key words "neutrophil lymphocyte ratio" between January 2005 and December 2014. All of the original articles were evaluated according to date of publications, countries, clinics and topics. Studies about occlusive vascular diseases were evaluated according to their qualifications, review methods and results. SPSS for Windows 16.0 was used in data analysis and data were expressed as mean, standard deviation and ***: A total of 735 original research articles were investigated. The number of publications have shown a regular logarithmic increase over the years. Thirty-two percent of all publications were performed by clinics in Turkey and 56.4% were performed by general-oncological surgery and cardiology clinics. A total of 107 publications were identified to be about occlusive vascular diseases, 80.3% of these publications were found to be prognostic and 19.6% to be diagnostic, 82.2% of them were found to be planned as retrospective and 17.7% as prospective. In 95.3% of prognostic publications, there was a positive correlation between high NLR values at admission and poor prognosis. In 95.3% of diagnostic publications high NLR values at admission were identifi ed to be signifi cant ***: Elevated neutrophil-to-lymphocyte ratio at admission, could be used as a diagnostic and/or prognostic parameter in occlusive vascular diseases.

关键词： Neutrophil-to-lymphocyte ratio Occlusive vascular diseases Publication

Cytotoxic, apoptotic and cell migration inhibitory effects of atranorin on SPC212 mesothelioma cells

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Asian Pacific Journal of Tropical Biomedicine 2019年第7期9卷 299-306页

作者： Erhan Sahin Sinem Dabagoglu Psav Ilker Avan Mehmet candan Varol Sahinturk Ayse Tansu Koparal Histology and Embryology Department Medicine SchoolEskisehir Osmangazi UniversityEskisehirTurkey Biology Department Faculty of ScienceEskisehir Technical UniversityEskisehirTurkey Chemistry Department Faculty of ScienceEskisehir Technical UniversityEskisehirTurkey

Objective: To investigate the effects of atranorin, a lichen secondary metabolite, on SPC212 malignant mesothelioma cells in vitro. Methods: SPC212 malignant mesothelioma cell line was used. 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay was used to evaluate cytotoxic effects of atranorin and cisplatin at 24, 48 and 72 h. Hematoxylin-eosin staining and 4’,6-diamidino-2-phenylindole, dihydrochloride staining were used for determining cell and nucleus morphology, respectively. Wound healing assay was used for investigating cell migration. The xCELLigence real-time cell analysis system was used for determining cell ***: Atranorin at 5-450 μM decreased cell viability at 24, 48 and 72 h. IC50 values of atranorin were 300.94, 292.6 and 278.02 μM at 24, 48 and 72 h, respectively;meanwhile, the IC50 values of cisplatin were 128.00, 34.37 and 17.05 μM at 24, 48 and 72 h, respectively. Furthermore, atranorin disrupted cell and nuclear morphology with increasing concentrations. Atranorin significantly reduced cell migration by 38%, 37% and 35% at 300, 250 and 200 μM, respectively(P<0.000). Atranorin at 160-450 μM decreased cell proliferation at 72 h(P<0.000).Conclusions: Atranorin has cytotoxic, antiproliferative, apoptotic and cell migration inhibitory effects on SPC212 malignant mesothelioma cancer cells.

关键词： Atranorin Malignant mesothelioma SPC212 cell line

Assessment of cardiac function in absence of congenital and acquired heart disease in patients with Down syndrome

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World Journal of Pediatrics 2016年第4期12卷 463-469页

作者： Sevket Balli Ilker Kemal Yucel Ayse Esin Kibar Ibrahim Ece Eylem Sen Dalkiran Sukru candan Department of Pediatric Cardiology Balikesir Ataturk HospitalBalikesirTurkey Department of Pediatric Cardilogy Siyami Ersek Education and Research HospitalIstanbulTurkey Department of Pediatric Cardiology Children's HospitalMersinTurkey Department of Pediatric Cardiology Yuzuncu Yil University of MedicineVanTurkey Department of Pediatrics Balikesir Ataturk HospitalBalikesirTurkey Department of Medical Genetics Balikesir Ataturk HospitalBalikesirTurkey

Background:Extra genetic material in patients with Down syndrome(DS)may affect the function of any organ *** evaluated cardiac functions using conventional tissue Doppler and two-dimensional speckle tracking echocardiography in patients with DS in the absence of congenital and acquired heart disease in ***:A total of 115 patients with DS between 6 and 13 years of age with clinically and anatomically normal heart and 55 healthy children were included in this cross-sectional *** was diagnosed by a karyotype *** with mosaic type were not included in this *** and diastolic functions were evaluated by ***:Pulsed waved Doppler transmitral early/late inflow velocity(E/A),tissue Doppler mitral annular early/late diastolic peak velocity(Ea/Aa),transtricuspid E/A and tricuspid valve annulus Ea/Aa,pulmonary venous Doppler systolic/diastolic(S/D)wave ratio were lower in patients with Down syndrome than in the control group(P=0.04,P=0.001,P<0.05,P<0.001,P<0.001,respectively).Mitral and tricuspid annular Ea were lower in patients with DS(P<0.001).The right and left ventricular myocardial performance indexes were higher in patients with DS than in the controls(P<0.01).They had significantly higher left ventricular mass,ejection fraction,the mitral annular plane systolic excursion ***,the Down syndrome group compared with the controls had a lower strain values examined by two-dimensional longitudinal speckle-tracking strain ***:These findings suggest conventional tissue Doppler and two-dimensional longitudinal speckletracking strain echocardiography were useful methods of investigating ventricular function and identifying a higher incidence of biventricular dysfunction in patients with Down syndrome compared with the healthy controls.

关键词： diastolic function Down syndrome strain imaging analysis systolic function tissue Doppler