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Tribological performance of iron- and nickel-base self-lubricating claddings containing metal sulfides at high temperature

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Friction 2022年第12期10卷 2069-2085页

作者： Hector TORRES tugce caykara Jens HARDELL Janne NURMINEN Braham PRAKASH Manel RODRIGUEZ RIPOLL AC2T research GmbH Viktor-Kaplan-Straße 2/CWiener Neustadt 2700Austria Department of Applied Physics and Mechanical Engineering LuleåUniversity of TechnologyLuleå97187Sweden Castolin Eutectic GmbH Gutenbergstraße 10Kriftel 65830Germany Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China

Iron-based coatings with the incorporation of solid lubricants have been prepared by means of laser cladding,in an effort to control friction and decrease tool wear at high temperatures during metal forming *** choice of a Fe-based powder has been considered advantageous,as it can lead to decreased costs compared to nickel-based claddings previously studied by the authors,in addition to having a lower environmental *** particular,the incorporation of transition metal dichalcogenides such as MoS_(2) as precursors leads to the encapsulation of silver in Fe-based self-lubricating claddings,resulting in a uniform distribution of the soft metal across the thickness of the *** tribological evaluation of the claddings at high temperatures shows that the addition of lubricious compounds leads to lower friction at room temperature and significantly decreased wear up to 600℃ compared to the unmodified iron-based reference alloy,although higher than similar self-lubricating Ni-based *** order to cast light into these observed differences,the corresponding microstructures,phase composition,and self-lubricating mechanisms have been studied and compared for Fe-and Ni-based claddings having both of them the addition of silver and MoS_(2).The results suggest a key role of the formation of protective tribolayers on the counter body during high temperature sliding *** simulation of the phase evolution during solidification reveals that the formation of different chromium-and nickel-based metal sulfides in Fe-and Ni-claddings during laser cladding by the decomposition of MoS_(2) plays a key role in determining their tribological behaviour at high temperatures.

关键词： high temperature laser cladding self-lubrication metal forming chromium sulphide MoS_(2)

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Neutrosophic N-Structures Applied to Sheffer Stroke BL-Algebras

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Computer Modeling in Engineering & Sciences 2021年第10期129卷 355-372页

作者： tugce Katican Tahsin Oner Akbar Rezaei Florentin Smarandache Department of Mathematics Ege UniversityIzmir35100Turkey Department of Mathematics Payame Noor UniversityTehran19395-4697Iran Department of Mathematics and Science University of New MexicoGallup87301NMUSA

In this paper,we introduce a neutrosophic N-subalgebra,a(ultra)neutrosophic N-filter,level sets of these neutrosophic N-structures and their properties on a Sheffer stroke *** defining a quasi-subalgebra of a Sheffer stroke BL-algebra,it is proved that the level set of neutrosophic N-subalgebras on the algebraic structure is its quasi-subalgebra and vice *** we show that the family of all neutrosophic N-subalgebras of a Sheffer stroke BL-algebra forms a complete distributive *** that a(ultra)neutrosophic N-filter of a Sheffer stroke BL-algebra is described,we demonstrate that every neutrosophic N-filter of a Sheffer stroke BL-algebra is its neutrosophic N-subalgebra but the inverse is generally not ***,it is presented that a level set of a(ultra)neutrosophic N-filter of a Sheffer stroke BL-algebra is also its(ultra)filter and the inverse is always ***,some features of neutrosophic N-structures on a Sheffer stroke BL-algebra are investigated.

关键词： Sheffer stroke BL-algebra (ultra)filter neutrosophic N-subalgebra (ultra)neutrosophic N-filter

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Fast clogging problem of open check dams and a new type suggestion:curved footed type open check dam

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Journal of Mountain Science 2023年第5期20卷 1201-1219页

作者： ANILAN tugce AKCALI Emre Karadeniz Technical University Department of Civil EngineeringTrabzon 61080Turkiye State Hydraulic Works 6th Regional DirectorateAdana 01120Turkiye

Driftwood is one of the important physical components in mountainous rivers which causes severe hazards due to the clogging of bridges,culverts,and narrow sections during ***,the understanding of driftwood dynamics and mitigation measures are crucial for managing wood in *** check dams are the most commonly used engineering measure for preventing driftwood from reaching downstream ***,these open check dams frequently lose their sediment transport function when they are blocked by sediment and driftwood,especially during major flood *** paper proposes a new type of open check dam for preventing from ***,flume experiments were conducted to examine the influence of different types of open check dams on the characteristics of driftwood *** the model with wood length(LWD)=16.5 cm,wood diameter(D)=15 mm,and wood number(N)=172,the highest trapping efficiency was observed with 90.1%and 87.2%retention rates for the classical debris flow breaker and curved footed open check dams,*** tests showed that through this proposed design,woody debris blockage in a very short time was prevented from the accumulation of woods beside the *** addition to this,most of the sediment passed through the check dam and most of the driftwood got *** can be briefly stated that the geometrical design of the structure plays an important role and can be chosen carefully to optimize trapping *** designing this type of open check dams in mountain river basins,it may provide a better understanding of the driftwood accumulation and basis for the optimal design of these *** development of the solution proposed in this work can pave the way for designing different types of open check dams for effective flood management.

关键词： Debris flow Open check dam Driftwood Trapping efficiency Sediment transport Flood management Riverflow

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Effect of transcatheter aortic valve replacement on P-wave duration, P-wave dispersion and left atrial size

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Journal of Geriatric Cardiology 2015年第6期12卷 613-617页

作者： Huseyin Dursun Zulkif Tanriverdi tugce Colluoglu Dayimi Kaya Department of Cardiology Faculty of Medicine Dokuz Eylul University Izmir Turkey Clinic of Cardiology Idil State Hospital Sirnak Turkey

Background P-wave dispersion （PWD）, a measure of heterogeneity of atrial refractoriness, is defined as the difference between the maximum and minimum P-wave duration. In patients with severe aortic stenosis （AS）, P-wave duration and PWD were shown to be increased, indicating atrial electrical remodeling. However, the effect of transcatheter aortic valve replacement （TAVR） on P-wave morphology has not been established yet. The aim of this study is to assess the short and long-term effects of TAVR with two types of bioprosthetic valves on P-wave duration and PWD in association with left atrial （LA） size. Methods Fifty-two （36 female） eligible patients in sinus rhythm who underwent transfemoral TAVR between June 01, 2012 and July 31, 2014 with either a Medtronic CoreValve （MCV）（n = 32） or an Edwards SAPIEN XT Valve （n = 20） were enrolled. Standard 12-lead electrocardiogram and echocardiographic evaluations were per- formed pre-procedurally, post-TAVR day one and 6 months post-TAVR. P-wave duration and PWD were measured and correlation analyses with echocardiographic variables were performed. Results P-wave duration and PWD were significantly decreased on post-TAVR day one （P 〈 0.05）. They continued to decrease during the six month follow-up period, but were not significantly different from short-term values （P 〉 0.05）. The decrease of LA diameter was found significant at the sixth-months of follow-up （P 〈 0.05）. These changes were independent from the types of bioprosthetic valves implanted （P 〉 0.05）. A positive correlation was detected between minimum P-wave duration and maximum aortic valve gradients at post-TAVR day one （r = 0.297, P = 0.032）. Conclusions P-wave duration and PWD were significantly reduced early after TAVR indicating early reverse atrial electrical remodeling. Moreover, structural reverse remodeling of atrium was detected at the 6-months of follow-up. The effects of two types of bioprosthetic valves on atrial remodeling were similar.

关键词： Aortic stenosis P-wave dispersion Transcatheter aortic valve replacement

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Ground movement patterns and shallow foundation performance in Iskenderun coastline during the 2023 Kahramanmaras earthquake sequence

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Earthquake Engineering and Engineering Vibration 2023年第4期22卷 867-881页

作者： tugce Baser Kamran Nawaz Albert Chung Seikh Faysal Ozgun Alp Numanoglu Department of Civil and Environmental Engineering University of Illinois Urbana-ChampaignUrbanaIllinois 61801USA Schnabel Engineering 16300 Christensen Rd Suite 350TukwilaWA 98188USA

This study focuses on the field reconnaissance efforts for investigating ground deformation behavior and building foundation performance in *** structures experienced significant damage or collapsed due to strong ground shaking in the coastal Iskenderun district of Hatay during the 2023 Kahramanmaras earthquake *** buildings were also impacted by ground failure due to liquefaction of deposits in the *** information regarding the general subsurface profile and post-earthquake data collected during the reconnaissance was used to perform simplified liquefaction and lateral spreading *** empirical methods provide first order estimations of settlements and lateral spreading but are not sufficient when the nature of the structure-soil-structure interaction and earthquake sequence is *** of vertical displacements and building tilt,liquefaction manifestations,and structural and foundation parameters potentially affecting foundation settlements including foundation geometry,building contact pressure,and building elastic period were used to evaluate seismic response of the ground and the structures through empirical *** of the buildings exhibited poor to mediocre foundation performance due to liquefaction-prone subsurface profiles,especially on the *** field and numerical research will reveal the cause of significant ground failure in the area as well as refined estimates for the seismic deformations.

关键词： Turkiye earthquake Iskenderun settlement geo-structures liquefaction lateral spreading foundation performance building settlements seismic settlements

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