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Multifunctional characteristics of 3D printed polymer nanocomposites under monotonic and cyclic compression

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Defence Technology（防务技术） 2023年第12期30卷 13-22页

作者： Pawan Verma Jabir Ubaid Fahad Alam suleyman Deveci s.Kumar Department of Mechanical Engineering Khalifa University of Science and TechnologyMasdar InstituteMasdar CityP.O.Box 54224Abu DhabiUnited Arab Emirates Borouge Pte.Ltd. Innovation CentreSas Al Nakhl6951Abu DhabiUnited Arab Emirates James Watt school of Engineering University of GlasgowGlasgowG128QQUK

This study presents the multifunctional characteristics of multi-walled carbon nanotube(MWCNT)/polypropylene random copolymer(PPR) composites enabled via fused filament fabrication(FFF) under monotonic and quasi-static cyclic compression. Utilizing in-house MWCNT-engineered PPR filament feedstocks, both bulk and cellular composites were realized. The morphological features of nanocomposites were examined via scanning electron microscopy, which reveals that MWCNTs are uniformly dispersed. The uniformly dispersed MWCNTs forms an electrically conductive network within the PPR matrix, and the resulting nanocomposite shows good electrical conductivity(~10^(-1)s/cm), improved mechanical performance(modulus increases by 125% and compressive strength increases by 25% for 8 wt% MWCNT loading) and pronounced piezoresistive response(gauge factor of 27.9-8.5 for bulk samples)under compression. The influence of strain rate on the piezoresistive response of bulk samples(4 wt% of MWCNT) under compression was also measured. Under repeated cyclic compression(2% constant strain amplitude), the nanocomposite exhibited stable piezoresistive performance up to 100 cycles. The piezoresistive response under repeated cyclic loading with increasing strain amplitude of was also *** gauge factor of BCC and FCC cellular composites(4 wt% of MWCNT) with a relative density of 30%was observed to be 46.4 and 30.2 respectively, under compression. The higher sensitivity of the BCC plate-lattice could be attributed to its higher degree of stretching-dominated deformation behavior than the FCC plate-lattice, which exhibits bending-dominated behavior. The 3D printed cellular PPR/MWCNT composites structures were found to show excellent piezoresistive self-sensing characteristics and open new avenues for in situ structural health monitoring in various applications.

关键词： Carbon nanotubes Nanoengineered polymer composites 3D printing Piezoresistive self-sensing Lattice structures

Effects of short-term adaptation to new complete dentures on perception thresholds for interocclusal thickness in experienced and non-experienced denture wearers

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Chinese Medical Journal 2004年第5期117卷 738-741页

作者： A.Dilek nalbant Department of Prosthodontics

Background The ability of patients to discriminate thickness can change with time after the insertion of new complete dentures, and this adaptation may differ according to the experiences of the patients If so, an education program to reinforce the oral functions may be needed This study was to evaluate patients' ability to discriminate thickness by comparing experienced and non-experienced denture wearers after the insertion of new complete dentures Methods Forty edentulous patients with a skeletal Class Ⅰ jaw relationship without any temporomandibular disturbances were in the study After insertion of new complete dentures, all patients were tested for discrimination threshold for interocclusal thickness The thickness perception test was repeated on days 1, 7, and 30 after the insertion of new dentures The discriminatory ability was assessed with steel and aluminium foils placed between the upper and lower central incisor teeth The records included the duration of wearing dentures The data were subjected to statistical analysis of two-way ANOVA, multiple comparison test and student's t test Results Discrimination of tactile ability significantly increased over 30 days in experienced denture wearers as compared with non-experienced patients ( P ss perception threshold was statistically significant between the two groups ( P sion Adaptation and denture experience can affect thickness discrimination of complete denture wearers

关键词： complete denture wearer tactile sensibility thickness perception

surface charging activated mechanism change: A computational study of O, CO, and CO2 interactions on Ag electrodes

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Journal of Energy Chemistry 2020年第11期29卷 307-313页

作者： Ilker Tezsevin Mauritius C.M.van de sanden suleyman Er DIFFER-Dutch Institute for Fundamental Energy Research De Zaale 20Eindhoven 5612 AJThe Netherlands CCER-Center for Computational Energy Research DIFFER-Dutch Institute for Fundamental Energy ResearchDe Zaale 20Eindhoven 5612 AJThe Netherlands Department of Applied Physics Eindhoven University of TechnologyEindhoven 5600 MBThe Netherlands

Electrocatalytic and plasma-activated processes receive increasing attention in catalysis. Density functional theory(DFT) calculations are state-of-the-art tools for the fundamental study of reaction mechanisms and predicting the performance of catalytic materials. Proper application of DFT-based methods is crucial when investigating charge-doped electrode surfaces during electrocatalytic and plasma-activated reactions. Here, as a model electrode for plasma-activated CO2 splitting, we studied the interactions of O, CO, and CO2 with the neutral and progressively charged Ag(111) metal surfaces. We show that the application of correction procedures is necessary to obtain accurate adsorption energy profiles of O atoms,CO and CO2 molecules on Ag surfaces that are under the influence of additional electrons. Interestingly,the oxidation of CO is found to shift from a Langmuir–Hinshelwood mechanism on a neutral electrode to an Eley–Rideal mechanism on charged electrodes. Furthermore, we show that the surface charging of Ag(111) electrodes increase their CO2 reduction performance by enhancing the adsorption of O atoms and desorption of CO molecules. A further increase in the absolute charge-state of the electrode surface is expected to waive the thermodynamic barriers for the CO2 splitting reaction.

关键词： Density functional theory CO2 reduction silver electrode surface charge

Low-fluence photodynamic therapy combinations in the treatment of exudative age-related macular degeneration

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International Journal of Ophthalmology(English edition) 2012年第3期5卷 377-383页

作者： Taylan Ozturk Hakan Oner Ali Osman saatci suleyman Kaynak Department of Ophthalmology Dr.Behet Uz Children's HospitalIzmirTurkey Department of Ophthalmology School of MedicineDokuz Eylul University IzmirTurkey

AIM:To compare the efficacy of low-fluence photodynamic therapy(PDT) combinations in the treatment of age-related macular degeneration(AMD).· METHODs:Forty-five previously untreated eyes of 45 patients with exudative AMD whose best-corrected visual acuity(BCVA) was ≥0.3(snellen) were enrolled.15 patients in Group I underwent low-fluence PDT(25J/cm2-300mW/cm2-83sec) and intravitreal pegaptanib combination,15 patients in Group II underwent PDT(50J/cm2-600mW/cm2-83sec) and intravitreal pegaptanib combination while,15 patients in Group III underwent intravitreal pegaptanib *** ophthalmologic examinations were performed in pre and post treatment visits,and the results were statistically analised.A clinical activity score(CAs) was calculated by using changes in lesion size,amount of hemorrhage,staining pattern in FA and OCT measurement of intra/subretinal fluid.≤3 logMAR lines of decrease in BCVA and decrease in CAs were considered as successful treatment.· REsULTs:The mean age of 19 female(42.2%) and 26 male(57.8%) patients was(72.82±8.02) *** follow-up was(13.93±5.87) *** type was occult in 28 eyes(62.2%).Treatment success rates according to BCVA assessments were 86.7%,80%,60% and mean BCVA decrease were 0.3,1.0,2.2 logMAR lines in Group I,II and III,respectively(P >0.05).According to the changes in central macular thickness and CAs,no difference was found among the study groups(P =0.850 and P =0.811,respectively).Patients treated with combination regimens had lower intravitreal injection frequencies(P =0.015).· CONCLUsION:Combination regimen with intravitreal pegaptanib and low-fluence PDT seems to be safe and effective in stabilizing the clinical activity and BCVA in exudative AMD.·

关键词： age-related macular degeneration photodynamic therapy low-fluence photodynamic therapy anti-VEGF

Effect of acupuncture therapy on fracture healing in rats with femur fractures

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Journal of Traditional Chinese Medicine 2020年第2期40卷 275-283页

作者： seval Yilmaz Emre Kaya Erhan Yilmaz Ahmet Kavakli suleyman Gurbuz Mustafa Ozkaraca Firat University Faculty of Veterinary MedicineDepartment of BiochemistryElazig 23119Turkey Firat University Faculty of MedicineDepartment of Orthopedics and TraumatologyElazig 23119Turkey Firat University Faculty of MedicineDepartment of AnatomyElazig 23119Turkey Ataturk University Faculty of Veterinary MedicineDepartment of PathologyErzurum 25240Turkey

OBJECTIVE: To investigate the effect of acupuncture therapy on fracture healing in rats with femur ***: A total of 10 groups were formed;control group, groups sacrificed on 7 th, 14 th, and 21 st days of fracture formation, groups to which acupuncture was applied for 7, 14, and 21 d, groups to which fracture and acupuncture were applied for 7,14, and 21 d. A transverse fracture line was formed in femurs of rats by using a Gigli saw. The Kirschner wire was driven retrograde down from the fracture line to proximal part of the bone and then, the fracture was fixed towards distal part. Acupuncture was applied to the rats for 7, 14, and 21 d as 4 sessions per week after formation of the ***: Malondialdehyde(MDA), reduced glutathione(GsH) levels, catalase(CAT), glutathione-stransferase(GsT), superoxide dismutase(sOD), and glucose-6-phosphate dehydrogenase(G6 PD) activities were measured. Despite the increased MDA levels, G6 PD and sOD activities reduced during the fracture healing. There was a statistically significant increase in MDA, GsH levels, and G6 PD activity in fracture groups compared to control group, but CAT, GsT, and sOD activities decreased. The use of acupuncture enhanced callus development and bone mineralization during bone ***: The acupuncture therapy can affect suppression of the effects of free oxygen radicals and regulation of the antioxidant enzyme activity in fracture healing. Thus, it is suggested that acupuncture treatment would be beneficial for fracture healing in order to eliminate the negative effects induced by oxygen free radicals.

关键词： Femur Fracture healing Acupuncture Malondialdehyde Antioxidants

Kd-tree and quad-tree decompositions for declustering of 2D range queries over uncertain space

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Frontiers of Information Technology & Electronic Engineering 2015年第2期16卷 98-108页

作者： Ahmet sAYAR suleyman EKEN Okan OZTURK Department of Computer Engineering Kocaeli University Kocaeli 41380 Turkey

We present a study to show the possibility of using two well-known space partitioning and indexing techniques, kd trees and quad trees, in declustering applications to increase input/output （I/O） paraUelization and reduce spatial data processing times. This parallelization enables time-consuming computational geometry algorithms to be applied efficiently to big spatial data rendering and querying. The key challenge is how to balance the spatial processing load across a large number of worker nodes, given significant performance heterogeneity in nodes and processing skews in the workload.

关键词： Kd tree Quad tree space partitioning spatial indexing Range queries Query optimization

What is the relationship between frailty and orthostatic hypotension in older adults?

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Journal of Geriatric Cardiology 2019年第3期16卷 272-279页

作者： suleyman Emre Kocyigit Pinar soysal Esra Ates Bulut Ali Ekrem Aydin Ozge Dokuzlar Ahmet Turan Isik Unit for Aging Brain and Dementia Department of Geriatric MedicineFaculty of MedicineDokuz Eylul UniversityIzmirTurkey Department of Geriatric Medicine Bezmialem Vakif UniversityFaculty of MedicineIstanbulTurkey

Background Frailty and orthostatic hypotension (OH),which is common in older adults,is associated with morbidity and *** relationship between them remains *** aim of the study is to determine whether there is a relationship between frailty and *** A total of 496 patients who were admitted to the geriatric clinic and underwent comprehensive geriatric assessment were retrospectively *** a cross-sectional and observational study,OH was measured by the Head-up Tilt Table test at 1,3,and 5 min (respectively,OH1,OH3,and OH5) and the frailty was measured by the Fried’s frailty *** The mean age of all patients was 75.4 ± *** prevalence of females was 69.8%.When the frail people were compared with the pre-frail and the robust ones,the frailty was associated with *** was no relationship between the groups in terms of OH1 when the pre-frail group was compared with the robust ***3 were higher in the frail group than in the pre-frail group (P st group (P ssociated with frailty status when they were adjusted for age (P > 0.05).slowness and weakness were associated with OH1 (P s the other components of the Fried’s test were *** Frailty may be a risk factor for *** 1^st min measurements of OH should be routinely evaluated in frail older adults to prevent OH-related poor outcomes.

关键词： Frail Orthostatic hypotension Pre-frail Robust

Effects of phacoemulsification surgery on ocular hemodynamics

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International Journal of Ophthalmology(English edition) 2013年第4期6卷 537-541页

作者： Adem Turk suleyman Mollamehmetoglu Halil Ibrahim Imamoglu Mehmet Kola Hidayet Erdol Nurettin Akyol Department of Ophthalmology School of MedicineKaradeniz Technical University

AIM:To evaluate the possible effects of phacoemulsification cataract surgery on ocular hemodynamics.·METHODs:In this prospective study,intraocular pressure(IOP),pulsatile ocular blood flow(POBF),and ocular pulse amplitude(OPA) were measured pre-operatively(baseline) and at 1 week and 3 weeks postoperation in 52 eyes of 26 patients(mean age 63.15±10.25 years) scheduled for unilateral phacoemulsification cataract surgery with intraocular lens *** all of the eyes,a blood flow analyzer(Paradigm DICON;Paradigm Medical Industries Inc.;UsA) was used to obtain measurements of IOP,POBF,and *** data obtained from operated eyes were compared statistically to untreated fellow phakic eyes of the patients.·REsULTs:For operated eyes,the mean baseline IOP,POBF,and OPA values were 15.9±4.64mmHg,17.41±4.84μL/s,and 2.91 ±1.12mmHg,*** IOP,POBF,and OPA values were 17.19 ±4.34mmHg,17.56 ±6.46μL/s,and3.12 ±1.1mmHg,respectively,in the nonoperated control *** significant differences from baseline measurements were not observed 1 week and 3 weeks postoperation for the operated or nonoperated *** were also no statistically significant differences in any measurements between the operated and nonoperated eyes in all the examination periods(P >0.05for all).·CONCLUsION:Uncomplicated phacoemulsification surgery does not affect ocular hemodynamics in normotensive eyes with cataracts.

关键词： cataract cataract extraction intraocular pressure phacoemulsification regional blood flow

Primary Breast Tuberculosis: Report of a Case

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surgical science 2013年第1期4卷 68-71页

作者： Kamil Gulpinar s. Erpulat Ozis suleyman Ozdemir Atilla Korkmaz Department of General surgery Ufuk University School of Medicine Ankara Turkey

Mammary tuberculosis is a rare clinical entity, often mimicking breast cancer or abscesses. A 26-year-old female presented with a painful left breast mass and an associated sinus tract with purulent discharge. Physical examination revealed a tender, erythematous, firm left breast mass with an associated sinus tract opening with discharge within the upper outer quadrant of her left breast with a clinically palpable left axillary lymphadenopathy. Ultrasound revealed nonspecific findings and mammography could not utilize due her young age. A surgical procedure was planned and the left breast mass was completely removed by an open surgical biopsy including left axillary lymphnodes and the hystopathological evaluation of the specimen revealed findings consistent with mammary tuberculosis whereas no other nidus for tuberculosis were found within the organs including lungs. Primary mammary tuberculosis should be considered in the differential diagnosis of any case of a painful breast mass that appears refractory to conventional therapy.

关键词： Primary Mammary Tuberculosis Breast