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Wear and mechanical properties of carburized AISI 8620 steel produced by powder metallurgy

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International Journal of Minerals,Metallurgy and Materials 2021年第3期28卷 430-439页

作者： Mehmet Akif erden Fatih Aydın Department of Biomedical Engineering Karabuk UniversityKarabuk 78050Turkey Department of Metallurgical and Materials Engineering Karabuk UniversityKarabuk 78050Turkey

The effect of carburization on the tensile strength and wear resistance of AISI 8620 steel produced via powder metallurgy was *** 1 and 2(with 0.2wt%C and 0.25wt%C,respectively)were first pressed at 700 MPa and then sintered at 1300,1400,or 1500℃for 1 *** ideal sintering temperature of 1400℃was ***,Alloys 1 and 2 sintered at 1400℃were carburized at 925℃for 4 *** microstructure characterization of alloys was performed via optical microscopy and scanning electron *** mechanical and wear behavior of carburized and noncarburized alloys were investigated via hardness,tensile,and wear *** carburization,the ultimate tensile strength of Alloys 1 and 2 increased to 134.4%and 138.1%,***,the elongation rate of Alloys 1 and 2 decreased to 62.6%and 64.7%,*** wear depth values of Alloy 2 under noncarburized and carburized conditions and a load of 30 N were 231.2 and 100.1μm,*** wear changed to abrasive wear when the load transitioned from 15 to 30 N.

关键词： powder metallurgy steels carburization microstructure wear mechanical properties

Microplastics in municipal wastewater treatment plants: a case study of Denizli/Turkey

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环境科学与工程前沿(英文) 2023年第8期17卷 95-105页

作者： Pelin Koyuncuoğlu Gülbin erden Environmental Engineering Department Engineering FacultyPamukkale UniversityKınıklıCampusDenizli 20160Turkey

Plastic particles smaller than 5 mm are *** are among the significant pollutants that recently attracted *** quantities of microplastics enter the sewage system daily and reach wastewater treatment plants(WWTPs).As a result,WWTPs are potential microplastic ***,they create a pathway for microplastics to reach aquatic environments with treated wastewater *** on microplastic characterization in WWTPs have gained momentum in *** study investigates the abundance,size,shape,color,polymer type,and removal efficiencies of microplastics in a municipal wastewater treatment plant(WWTP)in Denizli/*** results showed that the dominant microplastic shape in wastewater samples was fibers(41.78%–60.77%)in the 100–500μm(58.57%–80.07%)size *** of the microplastics were transparent-white(32.86%–58.93%).The dominant polymer types were polyethylene(54.05%)and polyethylene vinyl acetate(37.84%)in raw ***,the microplastic removal efficiencies of the Denizli Central WWTP as a whole and for individual treatment units were *** the microplastic pollution removal efficiency of the Denizli Central WWTP was over 95%,the microplastic concentration discharged daily into the receiving environment was considerably high(1.28×1010 MP/d).Thus,Denizli Central WWTP effluents result in a high volume of emissions in terms of microplastic pollution with a significant daily discharge to theÇürüksu Stream.

关键词： Microplastics Wastewater treatment plant Removal efficiency Daily discharge

A fast and efficient coordinated vehicle-to-grid discharging control scheme for peak shaving in power distribution system

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Journal of Modern Power Systems and Clean Energy 2018年第3期6卷 555-566页

作者： Nuh ERDOGAN Fatih erden Mithat KISACIKOGLU Department of Electrical Engineering University of Texas at Arlington Department of Electrical and Electronics Engineering Bilkent University Department of Electrical and Computer Engineering University of Alabama

This study focuses on the potential role of plugin electric vehicles(PEVs) as a distributed energy storage unit to provide peak demand minimization in power distribution systems. Vehicle-to-grid(V2 G) power and currently available information transfer technology enables utility companies to use this stored energy. The V2 G process is first formulated as an optimal control ***, a two-stage V2 G discharging control scheme is proposed. In the first stage, a desired level for peak shaving and duration for V2 G service are determined off-line based on forecasted loading profile and PEV mobility model. In the second stage, the discharging rates of PEVs are dynamically adjusted in real time by considering the actual grid load and the characteristics of PEVs connected to the grid. The optimal and proposed V2 G algorithms are tested using a real residential distribution transformer and PEV mobility data collected from field with different battery and charger ratings for heuristic user case scenarios. The peak shaving performance is assessed in terms of peak shaving index and peak load reduction. Proposed solution is shown to be competitive with the optimal solution while avoiding high computational loads. The impact of the V2 G management strategy on the system loading at night is also analyzed by implementing an off-line charging scheduling algorithm.

关键词： Distribution transformer Optimal discharging control Peak shaving Plug-in electric vehicles Vehicle-togrid

Seismic Tomography and Surface Wave Analysis Based Methodologies on Evaluation of Geotechnical Properties of Volcanic Rocks: A Case Study

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Journal of Earth Science 2014年第2期25卷 348-356页

作者： Ali erden Babacan Kenan Gelisli Hakan Ersoy Karadeniz Technical University Department of Geophysics Engineering

Economic development, industrialization and dense population in Trabzon City have caused residential construction to increase by 300% in the last decade. The settlement area is moun- tainous and covered with heavy vegetation. Thus, the steep-sided topography and heavy precipita- tion means floods and landslides are common and in areas with little flat land. Since the mass movements in some parts of city create an enormous danger for buildings, site selection for residen- tial areas becomes increasingly important. This paper describes geotechnical and seismic properties of Tertiary volcanic rock and establishes the link between these units and construction. In this study, refraction tomography and multichannel analysis surface wave methods were applied in order to seek the best construction site in the residential area. The results of the geophysical study were com- pared with the borehole applications. A series of geomechnical tests were carried out on the core samples. Following that, statistical correlations were conducted by regression analysis to evaluate re- lationships between measured parameters. Rock Quality Designation and weathering degree were also determined. The methodology defined in this investigation proves to be an appropriate ap- proach to determine geotechnical properties of the foundation rocks and soils and a proper guide on future geotechnical studies for other cities.

关键词： Trabzon City Turkey refraction tomography MASW ultrasonic geotechnical.

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文化认同视域下广场舞健康发展路径探索

鹿城学刊 2024年第1期36卷 29-30,62页

作者：于游洋额尔登苏布达内蒙古通辽市科尔沁左翼后旗文化馆内蒙古通辽028199 内蒙古自治区党委宣传部审读审看中心呼和浩特010096

在文化认同的视域下,广场舞作为一种贴近民众生活、含有丰富民族特色的群众性文化体育活动,不仅锻炼了身体、丰富了社区文化,还在促进老年人社会交往和心理健康方面发挥了重要作用,探究其健康发展路径有助于推动这一文化现象的持续正能... 详细信息

在文化认同的视域下,广场舞作为一种贴近民众生活、含有丰富民族特色的群众性文化体育活动,不仅锻炼了身体、丰富了社区文化,还在促进老年人社会交往和心理健康方面发挥了重要作用,探究其健康发展路径有助于推动这一文化现象的持续正能量影响。建立健康的广场舞发展机制,可以促进社会和谐稳定,提升民族文化的自信,进一步增强和拓展文化认同。通过规范、创新引导,广场舞能更好地融入现代社会发展的脉络,让传统与现代、健康与快乐、社区交流与文化传播在广场舞这一平台上得以和谐统一发展,使其成为中华文化多样性的生动体现,为构建和谐社会、推动文化传承与发展注入新的活力。

关键词：文化认同广场舞健康发展

Lattice Dynamics and Electronic Properties of Heusler Alloys Li_(2)AlX(X=Ga,In):A Comparison Study

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Chinese Journal of Chemical Physics 2021年第2期34卷 173-178,I0001页

作者： Emel Kilit Dogan Sinem erden Gulebaglan Department of Physics Van Yuzuncu Yil University65080 VanTurkey Department of Electricity and Energy Van Vocational SchoolVan Yuzuncu Yil UniversityVan 65080Turkey

The lattice parameters,bulk modulus,rst derivative of the bulk modulus,electronic band structures,phonon dispersion curves and phonon density of states calculations for Li_(2)AlGa and Li_(2)AlIn Heusler alloys are performed and compared in this study using density functional theory within the generalized gradient *** lattice parameters display a good agreement with the *** electronic band structures of both Heusler alloys show that they are in semi-metallic *** dispersion curves and the phonon density of states graphs are also obtained in order to study the lattice dynamics of these Heusler *** is noticed that Li_(2)AlGa and Li_(2)AlIn Heusler alloys are dynamically stable in the ground state.

关键词： Li_(2)AlGa Li_(2)AlIn Heusler alloys Electronic properties Dynamic properties

Lacrimal gland tumors in Turkey：types,frequency,and outcomes

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International Journal of Ophthalmology(English edition) 2018年第8期11卷 1296-1302页

作者： Yagmur Seda Yesiltas Ahmet Kaan Gundiiz Esra erden Carol L. Shields Department of Ophthalmology Ankara University Faculty of Medicine Ankara 06620 Turkey Department of Pathology Ankara University Faculty of Medicine Ankara 06230 Turkey Ocular Oncology Service Wills Eye Hospital Thomas Jefferson University Philadelphia PA 19107 USA

AIM： To evaluate the clinical, radiological, and treatment features of lacrimal gland ***： Retrospective review of 99 eyes of 92 patients with lacrimal gland tumors diagnosed and managed in a single institution between January 1999 and March 2017. Clinical and radiological features, histopathology, treatment methods, and prognosis were ***： The mean patient age was 40.3（range： 7-80）*** diagnosis was made histopathologically in 91（91.9%） tumors and on a clinical and radiological basis in 8（8.1%） tumors. Final diagnoses included idiopathic orbital inflammation（pseudotumor） in 46（46.5%） lesions, pleomorphic adenoma in 14（14.1%）, adenoid cystic carcinoma in 12（12.1%）, granulomatous inflammation in 10（10.1%）, lymphoma in 5（5.0%）, benign reactive lymphoid hyperplasia in 3（3.0%）, dacryops in 3（3.0%）, carcinoma ex pleomorphic adenoma in 2（2.0%）, adenocarcinoma in 1（1.0%）, dermoid cyst in 1（1.0%）, cavernous hemangioma in 1（1.0%）, and leukemic infiltration in 1（1.0%）. Nonepithelial tumors comprised 64.6%（n=64） of all lacrimal gland tumors, epithelial tumors 32.3%（n=32）, dermoid cyst 1%（n=1）, cavernous hemangioma 1%（n=1）, and leukemic infiltration 1%（n=1）. There were in total 78（78.8%） benign and 21（21.2%） malignant tumors. CONCLUSION： Overall, 65% of lacrimal gland tumors were of non-epithelial origin and 32% of epithelial origin. By histopathology and clinical evaluation, 79% of lacrimal gland tumors were benign. The most common lacrimal gland tumors include idiopathic orbital inflammation（46.5%）, epithelial（32.3%）, and lymphoproliferative（8.1%） lesions.

关键词： orbit lacrimal gland tumor inflammation epithelial tumor non-epithelial tumor

Femtosecond laser additive and subtractive micro-processing:enabling a high-channeldensity silica interposer for multicore fibre to silicon-photonic packaging

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International Journal of Extreme Manufacturing 2019年第4期1卷 24-32页

作者： Gligor Djogo Jianzhao Li Stephen Ho Moez Haque erden Ertorer Jun Liu Xiaolu Song Jing Suoand Peter R Herman The Edward S Rogers Sr Department of Electrical&Computer Engineering University of TorontoTorontoCanada Transmission&Access Research Department Huawei Technologies Co.LtdDongguanPeople’s Republic of China

Great strides have been made over the past decade to establish femtosecond lasers in advanced manufacturing systems for enabling new forms of non-contact processing of transparent *** advances have shown that a myriad of additive and subtractive techniques is now possible for flexible 2D and 3D structuring of such materials with micro-and nano-scale *** this paper,these techniques have been refined and scaled up to demonstrate the potential for 3D writing of high-density optical packaging components,specifically addressing the major bottleneck for efficiently connecting optical fibres to silicon photonic(SiP)processors for use in telecom and data *** 84-channel fused silica interposer was introduced for high-density edge coupling of multicore fibres(MCFs)to a SiP *** laser irradiation followed by chemical etching was further harnessed to open alignment sockets,permitting rapid assembly with precise locking of MCF positions for efficient coupling to laser written optical waveguides in the interposer.A 3D waveguide fanout design provided an attractive balancing of low losses,modematching,high channel density,compact footprint,and low *** 3D additive and subtractive processes thus demonstrated the potential for higher scale integration and rapid photonic assembly and packaging of micro-optic components for telecom interconnects,with possible broader applications in integrated biophotonic chips or micro-displays.

关键词： femtosecond laser micro-processing photonic packaging waveguide fanout fibre socket multicore fibre space-division multiplexing silicon photonics interposer

Comparison of one and three initial monthly intravitreal ranibizumab injection in patients with macular edema secondary to branch retinal vein occlusion

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International Journal of Ophthalmology(English edition) 2018年第9期11卷 1534-1538页

作者： Alper Halil Bayat Akin Cakir Seyma Gülcenur Ozturan Selim Bolükbasi Burak erden Mustafa Nuri Elcioglu Departmant of Opthalmology Okmeydani Research&Traning HospitalIstanbul 34384Turkey

AIM： To compare three initial monthly intravitreal ranibizumab（IVR） injections followed by pro re nata（PRN） dosing with one initial monthly IVR injections followed by PRN dosing for macular edema（ME） secondary to branch retinal vein occlusion（BRVO）.METHODS： Forty-two eyes of 42 patients who had IVR injections for BRVO were retrospectively studied. Eighteen eyes received 1 initial IVR injection（1＋PRN group） and 24 eyes received 3 monthly IVR injections（3＋PRN）. At 1, 3, 6 and 12mo; spectral-domain optical coherence tomography（SD-OCT） was performed. Central macular thickness（CMT）, the integrity of the external limiting membrane（ELM）, the presence of subretinal fluid, cyst size, the presence of inner segment/outer segment（IS/OS） defect were ***： At baseline the mean CMT was 521.3±153.2 μm in the 3＋PRN group while it was 438.1±162.4 μm in 1＋PRN group. At the final visit, mean CMT was 278.3±87.8 μm in the 3＋PRN group and 285.2±74.2 μm in the 1＋PRN group（P=0.079）. The changes in CMT over the entire study period were also comparable in both groups（243±160 μm in the 3＋PRN group, and 152.9±175.3 μm in the 1＋PRN group; P=0.090）. At baseline, best-corrected visual acuity（BCVA） was 0.92±0.60 logarithm of the minimal angle of resolution（logMAR） in the 3＋PRN group, while it was 0.72±0.46 logMAR in the 1＋PRN group. Final BCVA was 0.42±0.55 logMAR in the 3＋PRN group and 0.38±0.50 logMAR in the 1＋PRN group（P=0.979）. Additionally, the BCVA changes from baseline to final visit were not significantly different（-0.50±0.45 logMAR in the 3＋PRN group, and-0.33±0.39 logMAR in the 1＋PRN group; P=0.255）.CONCLUSION： No significant differences in the anatomical or functional results are found between 3＋PRN and 1＋PRN regimens in the patients receiving ranibizumab for ME secondary to BRVO. Intact IS/OS and baseline BCVA are good predictor of the visual gain, while baseline CMT is a good predictor of the anatomical gain.

关键词： branch retinal vein occlusion ranibizumab macular edema therapy predictive factors