Browsing by Author "Sari, A"
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Item Removal of Cr Ions from Aquatic Solutions Using Olive Leaves as Low-cost Bio-sorbentSahin, G; Aslan, A; Tuzen, M; Sari, AContamination of water by chromium (Cr) creates serious pollution in terms of the environment and public health, since its different forms become released into air, water, soil and residential areas. In the present work, olive leaf powder (OLP) was evaluated as a novel low-cost sorbent due to its various functional groups such as amide, hydroxyl, carboxyl, and carbonyl which are responsible for the bio-removal of chromium ions from aqueous solutions. The chemical functional groups and microstructure of the OLP bio-sorbent were characterized by the Fourier Transform Infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM) techniques. The bio-sorption conditions were optimized as pH 4, contact time 60 min, bio-sorbent dosage 40 g/L, temperature 40 degrees C. The bio-sorption isotherm was well fitted to the Langmuir model, and the predicted maximum bioremoval capacity of the OLP was estimated at 42.4 mg/g under the above-mentioned experimental conditions. The reuse performance of the bio-sorbent was determined after repeated sorption/desorption cycles. The thermodynamic examination showed that the chromium sorption by OLP was endothermic in thermal nature. The kinetic evaluations indicated that the bio-sorption process well followed with the pseudo-second-order model. The overall results demonstrated that the OLP can be thought as a potential bio-sorbent for cleaning of chromium-contaminated water and wastewater due to its advantageous properties such as low cost, availability, renewable nature, and remarkable bio-sorption capacity.Item The piezoelectric response of electrospun PVDF/PZT incorporated with pristine graphene nanoplatelets for mechanical energy harvestingParali, L; Tatardar, F; Koç, M; Sari, A; Moradi, RFlexible nanogenerators based on electrospun piezoelectric polyvinylidene fluoride (PVDF)/lead zirconium titanate (PZT) incorporated with unmodified graphene nanoplatelets (GNP) were fabricated via the electrospinning method. The microstructural and phase characterizations demonstrated a continuous and homogeneous fiber-shaped composite structure with good interfacial interaction between the GNP and the PVDF/PZT matrix. It was found that the diameter of the PVDF/PZT fibers was on average 270 nm, while the PVDF/PZT/GNP fiber with GNP content of 1.5wt.% had a diameter of approximately 236 nm. The piezoelectric performance evaluations of all nanogenerator devices indicated that the PVDF/PZT/GNP with GNP content of 1.5wt.% nanogenerator had an almost 6 times higher electrical output (8.68 mu W) compared to that of the PVDF/PZT-based nanogenerator (1.51 mu W) at 20 Hz within the same resistance of 2.5 M ohm. Considering its simple and low-cost fabrication technology, high performance, and stable electrical power efficiency, the introduced flexible nanogenerator based on the PVDF/PZT/GNP offers a promising capability of powering portable and wearable electronics.Item Experimental Analysis of Melting Behavior of Capric Acid (CA)-Stearic Acid (SA) Eutectic Mixture and its 3D Numerical Solution of Natural Convection in a CupCosanay, H; Selimefendigil, F; Öztop, HF; Sari, AComputational studies were performed to investigate the melting process in a cubical closed space. Capric acid (CA)-stearic acid (SA) eutectic mixture is chosen as a phase change material (PCM). Some thermo-physical properties such as melting temperature, latent heat of fusion, specific heat capacity, thermal conductivity, thermal expansion coefficient, density and viscosity of CA-SA eutectic mixture prepared as PCM were measured. Considering these measured properties, the melting behavior of the prepared eutectic PCM was simulated numerically with finite volume method in a three-dimensional cavity. Non-isothermal heating conditions throughout phase change process of the PCM are considered in the numerical modeling study. It is shown that temperature difference has a significant impact on the melting, while its behavior changes for various cross sections. It is observed that the melting does not change after 80 min for the studied PCM. Significant variations for the melting behavior are observed between 2D and 3D configurations. Melt fraction is only 1.20% higher in 3D case as compared to 2D case at t = 130 min and Gr = 1.8 x 10(5), while this value is 1.08% at Gr = 3.6 x 10(4).Item A PROPOSED ARTIFICIAL NEURAL NETWORK MODEL for PEM FUEL CELLSSari, A; Balikci, A; Taskin, S; Aydin, SFuel cells convert the chemical energy directly to the electrical energy and hence they are a very favorable alternative energy source. In the literature, there are many studies related to the modeling of fuel cells. Artificial neural networks (ANNs) is one of the promising techniques for modelling nonlinear systems such as fuel cells. The proposed model in this study doesn't require many parameters like other studies. Firstly, training and testing data was obtained the dynamic model of a PEM fuel-cell. Then, proposed ANN model outputs are compared with dynamic model ouputs Simulation results shows that the proposed ANN model can be used very efficiently for PEM fuel-cells without using many parameters.Item Vibration Modelling of Piezoelectric Actuator (PEA) Using Simulink SoftwareParali, L; Sari, AThis paper presents to define a vibration modelling of a PEA using MATLAB-Simulink software based on a single degree freedom mechanical model. The experimental vibration displacement values of PEA have been carried out utilizing the swept-sine signal excitation following the peak values in the signal response measured as contactless by the laser displacement sensor. Harmony between the mathematical modelling and experimental values have been observed from 96.6 to 81.4 % between excitation amplitudes of 0.5 and 3.0 V when the vibration modelling of PEA is normally taken into consideration with a linear working range. Therefore, obtained this vibration modelling could be used as training-testing tool for estimating vibration characterization of an actuator under any excitation voltages.Item Clinicopathological Features of 15 Penile Squamous Cell Carcinoma in Circumcised MenBaydar, D; Akkaya, H; Apa, D; Bat, N; Demirsam, A; Guchier, B; Nese, N; Sari, AItem Estimating elasticity modulus of the piezo ceramic disc (PCD) using basic mathematical modellingParali, L; Sari, A; Malgaca, L; Pechousek, J; Latal, FThe objective of this paper is to determine a mathematical modelling of piezoceramic disc vibration using a single degree freedom mechanical model, with estimation of its elasticity modulus. The experimental vibration displacement values of piezo ceramic disc have been achieved utilizing the swept-sine signal excitation following the peak values in the signal response measured by the laser Doppler vibrometer. Consistency between the mathematical modelling and experimental values have been observed from 97 to 80% between excitation amplitudes of 0.5 and 3.5 V when the mathematical modeling of piezo ceramic disc is normally taken into consideration with a linear working range. The results obtained from experimental studies on resonance frequency are in a compliance with reference value declared by producer of the piezo ceramic disc.Item The piezoelectric properties of three-phase electrospun PVDF/PZT/ Multiwalled Carbone Nanotube composites for energy harvesting applicationsKoç, M; Tatardar, F; Musayeva, NN; Guluzade, S; Sari, A; Parali, LIn this study, the piezoelectric nanogenerators (PENs) based on the PVDF (polyvinylidene fluoride)/PZT (lead zirconate titanate, the particle size of <1 m) incorporated with MWCNT (Multiwalled Carbone Nanotube, Outer diameter: 10 nm, Inner diameter: 4.5 nm, and Length: 3-6 mu m) were produced using the electrospinning method. An 8- phase content of 96.56 % in PVDF electrospun composites was arrived at due to the synergistic effect of the PZT ceramics and the MWCNT nanoparticles. The experimental results showed that a PVDF/PZT/0.7 wt% MWCNT composite with a thickness of 145 mu m based on the PEN had an electrical power efficiency (0.16 mu W) approximately 1.3 times higher at a vibrational frequency of 20 Hz under a resistive load of 46 K Omega as compared to that of the PEN based on the PVDF/PZT composite (0.12 mu W). The PVDF/PZT/MWCNT-based PENs have promising potential for flexible energy transmission and structural health monitoring.Item Effect of molding pressure and firing temperature on the properties of ceramics from natural zeoliteErdogmus, E; Sutcu, M; Hossain, S; Bayram, M; Sari, A; Gencel, O; Ozbakkaloglu, TIn recent years, there has been growing interest in eco-friendly and sustainable construction materials that reduce environmental impact while maintaining high-performance standards. The brick industry, in particular, is under pressure to develop solutions that incorporate waste and natural-based materials, reducing reliance on traditional energy-intensive manufacturing processes. In response, this study explores the fabrication of ceramic bricks using naturally occurring zeolite, which is widely available and offers promising properties for use in construction. The ceramic matrix is made with natural zeolite and water, pressed at three different pressures, and fired at three different temperatures. The study investigates the impact of varying molding pressures and firing temperatures on the microstructural and mechanical properties of ceramic bricks made with natural zeolite. XRF and XRD techniques were used to analyze the raw material's chemical composition, and TGA tests were conducted to evaluate the bricks' chemical stability. The study finds that the compressive strength of zeolite bricks molded at 15 MPa pressure and fired at 900 & DEG;C increased from 7.1 MPa to 51.2 MPa when fired at 1100 & DEG;C. Increasing the molding pressure led to a higher compressive strength of the specimens, but the effect was minimal compared to the influence of firing temperature on the compressive strength. The apparent porosity and water absorption of the bricks decreased with increasing molding pressure and firing temperature. Further, clinoptilolite, a zeolite phase, decomposes during firing and transforms into silica polymorphs, feldspathic phases, and glassy phases. As the molding pressure increased, the irregular-shaped pores in the brick specimens decreased. Moreover, the density of the bricks increased with the firing temperature due to sintering between particles in the microstructure. By investigating the impact of molding pressure and firing temperature on the microstructural and mechanical properties of these eco-friendly bricks, this study offers insight into a potential solution for sustainable construction practices. By investigating the impact of pressing pressure and firing temperature on the microstructural and mechanical properties of these eco-friendly bricks, this study demonstrated that optimizing firing temperature and pressing pressure can significantly improve the physical and mechanical properties of zeolite bricks, including bulk density, compressive strength, water absorption, and porosity, while also reducing the environmental impact of the production process. Thus, this study offers insight into a potential solution for sustainable construction practices.Item Phase change material incorporated paper pulp sludge/gypsum composite reinforced by slag and fly ash for energy efficient buildings: Solar thermal regulation, embody energy, sustainability index and cost analysisKucukdogan, N; Sutcu, M; Ozturk, S; Yaprak, H; Memis, S; Gencel, O; Ustaoglu, A; Sari, A; Hekimoglu, G; Erdogmus, EThis study focuses on the reuse of some industrial wastes in the development of innovative building materials and the thermal performance, environmental impacts and cost estimates of the gypsum composite material developed in the case of a phase change material impregnation. Lauryl alcohol (LA) was impregnated into paper pulp sludge (PPS) up to 45 % by weight without leakage to obtain shape-stable composites. The LA impregnated PPS (PPS/ LA) was replaced with PPS at 50 % and 100 % by weight in gypsum composite. Characteristics of shape-stable composites were studied. Also, the physical, mechanical, thermal properties and solar thermoregulation tests of the produced gypsum composites were examined in addition to the embodied energy, CO2 emissions and cost analysis. The melting and solidification enthalpies of PPS/LA were found to be 100.4-100.1 J/g, with only a 0.5 % reduction in latent heat storage capacity after 500 cycles, and approximately 3 % after 1500 cycles. Although the presence of PPS/LA in the gypsum composite caused a slight decrease in compressive strength, it significantly improved solar thermoregulation performance, maintaining ambient temperatures 2.55 degrees C to 5 degrees C warmer at night and 5.3 degrees C to 13.8 degrees C cooler during the day. Gypsum composites containing the PPS/LA offer a suitable alternative for energy-efficient sustainable building application by reusing around 57 % of three different industrial wastes providing a waste-reducing environmental approach and a high level of indoor thermal comfort.Item Assessment of the Relationship Between Vitamin D Level and Non-specific Musculoskeletal System Pain: A Multicenter Retrospective Study (Stroke Study Group)Karahan, AY; Hüner, B; Kuran, B; Sezer, N; Çelik, C; Salbas, E; Ordahan, B; Karaca, G; Yilmaz, H; Gündüz, B; Erhan, B; Bugdayci, DS; Bardak, A; Paker, N; Külcü, DG; Yaliman, A; Atalay, NS; Yildiz, N; Icagasioglu, A; Basaran, S; Tikiz, C; Kaydok, E; Kaya, T; Karatas, GK; Baygutalp, F; Celebi, G; Yilmaz, F; Önes, K; Akkus, S; Yumusakhuylu, Y; Durlanik, G; Dogu, B; Öncü, J; Sari, A; Özkan, FÜ; Kaysin, MY; Taskiran, ÖÖ; Erol, AM; Eskiyurt, NObjective: In this study, it was aimed to evaluate the relationship between vitamin D level and pain severity, localization and duration in patients with non-specific musculoskeletal pain. Materials and Methods: Patients who applied to physical medicine and rehabilitation outpatient clinics due to non-specific muscle pain in 19 centers in Turkey were retrospectively screened. Three thousand four hundred fourpatients were included in the study, whose pain level was determined by visual analog scale (VAS) and the painful region, duration of pain and vitamin D level were reached. D group was found to be D deficient (group 1) when 25 (OH) D level was 20 ng/mL or less and group D 2 (vitamin D deficiency) was higher than 30 ng/mL (group 3). The groups were compared in terms of pain duration, localization and severity. In addition, the correlations of pain localization, severity and duration with vitamin D levels were examined. Results: D vitamin deficiency was detected in 2202 (70.9%) of 3 thousand four hundred and four registered patients, and it was found that vitamin D deficiency in 516 (16.6%) and normal vitamin D in 386 (12.4%). The groups were similar in terms of age, body mass index, income level, duration of complaint, education level, family type and working status (p>0.05). There was no statistically significant difference between groups in terms of VAS, pain localization and duration scores (p>0.05). Conclusion: Our study shows that vitamin D deficiency in patients with nonspecific musculoskeletal pain is not associated with the severity and duration of pain.Item Demographic and clinical characteristics of inpatient stroke patients in TurkeyKülcü, DG; Kuran, B; Karahan, AY; Özgirgin, N; Basaran, S; Yaliman, A; Savas, S; Tikiz, C; Aktas, I; Bardak, A; Tuncer, T; Yilmaz, F; Erhan, B; Sirzai, H; Çelik, B; Durlanik, G; Dogu, B; Öncü, J; Hüner, B; Öztürk, G; Eskiyurt, N; Akpinar, FM; Özkan, FU; Paker, N; Bugdayci, DS; Gündüz, B; Satir, Ö; Atalay, NS; Yildiz, N; Altindag, Ö; Demir, SE; Kaya, E; Uçar, D; Sari, A; Karatas, GK; Taskiran, ÖÖObjectives: This study aims to assess the stroke rehabilitation facilities provided by university hospitals (UHs) and training and research hospitals (TRHs) and to evaluate the geographical disparities in stroke rehabilitation. Patients and methods: Between April 2013 and April 2014 a total of 1,529 stroke patients (817 males, 712 females; mean age: 61.7 +/- 14.0 years; range, 12 to 91 years) who were admitted to the physical medicine and rehabilitation clinics in 20 tertiary care centers were retrospectively analyzed. Demographic, regional and clinical characteristics, details of rehabilitation period, functional status, and complications were collected. Results: The median duration of stroke was five (range, 1 to 360) months. The ratio of the patients treated in the TRH in the Marmara region was 77%, but only 25% of the patients were living in the Marmara region. Duration of hospitalization was longer in the TRHs with a median of 28 days compared to those of UHs (median: 22 days) (p<0.0001). More than half of the patients (55%) were rehabilitated in the Marmara region. Time after stroke was the highest in the Southeast region with a median of 12 (range, 1 to 230) months and the lowest in the Aegean region with a median of four (range, 1 to 84) months. Conclusion: This study provides an insight into the situation of stroke rehabilitation settings and characteristics of stroke patients in Turkey. A standard method of patient evaluation and a registry system may provide data about the efficacy of stroke rehabilitation and may help to focus on the problems that hinder a better outcome.Item Assessment of the Relationship Between Vitamin D Level and Non-specific Musculoskeletal System Pain: A Multicenter Retrospective Study (Stroke Study Group) (vol 23, pg 61, 2017)Karahan, AY; Hüner, B; Kuran, B; Sezer, N; Çelik, C; Salbas, E; Ordahan, B; Karaca, G; Yilmaz, H; Gündüz, B; Erhan, B; Bugdayci, DS; Bardak, A; Paker, N; Külcü, DG; Yaliman, A; Atalay, NS; Yildiz, N; Içagasioglu, A; Basaran, S; Tikiz, C; Kaydok, E; Kaya, T; Karatas, GK; Baygutalp, F; Çelebi, G; Yilmaz, F; Önes, K; Akkus, S; Yumusakhuylu, Y; Durlanik, G; Dogu, B; Öncü, J; Sari, A; Özkan, FU; Kaysin, MY; Taskiran, OO; Erol, AM; Eskiyurt, NItem The caregiver burden of informal caregivers for stroke patients with and without dysphagia: A multi-center, cross-sectional study in TurkiyeGiray, E; Eyigör, S; Çalik, Y; Gezer, IA; Sari, A; Umay, E; Akaltun, MS; Tikiz, C; Ünlü, Z; Vural, M; Aydeniz, B; Karahan, AYObjectives: The aim of this study was to investigate the caregiver burden (CB) of informal caregivers for stroke survivors with and without dysphagia and to assess the relationship between the CB levels of informal caregivers for stroke survivors with dysphagia, patients' swallowing-related quality of life (QoL), and patients' stroke-specific QoL. Patients and methods: This multi- center, prospective, cross-sectional study included a total of 120 stroke patients (76 males, 44 females; mean age: 61.1 +/- 12.3 years; range, 19 to 86 years) between October 2019 and 2020. Of the patients, 57 had dysphagia and 63 had no dysphagia. The Functional Oral Intake Scale (FOIS) was used to classify the degree of functional dietary limitation caused by each patient's swallowing impairment. Patients and caregivers completed the Eating Assessment Tool (EAT-10), Swallowing Quality of Life (SWQoL) questionnaire, Stroke Impact Scale (SIS), and the Zarit Caregiver Burden Interview (ZBI). Results: The CB levels were higher in those caring for stroke patients with dysphagia than in those caring for stroke patients without dysphagia. Caregiver burden was found to be associated with patients' swallowing-related QoL and stroke-related QoL. Significant predictors of high CB scores (F=2.55, R2=0.59; p= 0.007) were being an employed caregiver (B=17.48, p= 0.003), being a caregiver with high school (B=-19.6, p=0.03), and secondary school (B=-16.28, p=0.02) educational status, being son, daughter (B=30.63, p=0.007) or other relative of the patient (B=20.06, p=0.01), lower FOIS stage (B=-3.14, p=0.011), lower SWQoL (B=0.52, p=0.009) and lower SIS (B=- 0.37, p=0.04) scores. Conclusion: Caregivers of stroke patients with dysphagia suffer from a higher CB than those without dysphagia. In stroke patients with dysphagia, swallowing-related QoL is associated with the QoL levels of stroke patients and the CB levels of their caregivers. Employment status, educational status of caregiver, caregiver's relativity to the patient, FOIS stage, swallowing and stroke related QoL of the patients are factors related to burden levels of caregivers of stroke patients with dysphagia. These results may help health professionals to understand dysphagia as an essential source of CB and consider it, while planning treatments.Item Developing Wallpaper/Dodecyl alcohol composite phase change materials as new kind of wall covering elements for building interior thermoregulationGencel, O; Ustaoglu, A; Sari, A; Hekimoglu, G; Sutcu, M; Tozluoglu, A; Tutus, A; Cicekler, M; Tyagi, VVThis study introduces a novel wall-covering element consisting of wallpapers (WP) impregnated with Phase Change Material (PCM), with the aim of enhancing thermal properties and providing effective thermal regulation performance in interior spaces. The study conducts practical investigations into the thermal attributes of wall-papers (WPs) impregnated with Dodecyl alcohol (DDA) as the chosen PCM, culminating in a leakage-free WP/ DDA wall covering element. The process of impregnating involved applying liquid DDA to the back side of the WP using a manual coating apparatus. Four distinct DDA ratios, ranging from 0% to 20% by mass of WP, were applied. The chemical compatibility of the developed WP/DDA composite was explored using Fourier Infrared Spectroscopy (FTIR). The thermal energy storage (TES) properties were assessed through Differential Scanning Calorimeter (DSC) analysis, and the thermo-regulative performance of the WP/DDA composite was evaluated in laboratory-scale test rooms under real weather conditions. The DSCoutcomesexposed that melting temperature and latent heat capacity of WP/DDA were 21.78 degrees C and 26.9 J/g, respectively.The thermoregulation tests showed that the prepared WP/DDAsignificantly reduce interior room temperature fluctuation and can maintain indoor temperature longer in comfortable temperature ranges. The largest difference between the reference room and test room was observed to be about 2celcius. The room temperature was cooler for about 9 h 53 min during day times for the DDA case.The results designated that the developed WP/DDA composite could be evaluated as a promising new kind of building wall covering element for reducing the cooling load of room.Item Clinicopathological Features of 15 Penile Squamous Cell Carcinoma in Circumcised MenBaydan, D; Akkaya, H; Apa, D; Bal, N; Demirsam, A; Gucluer, B; Nese, N; Sari, AItem Best Practice Recommendations for Stroke Patients with Dysphagia: A Delphi-Based Consensus Study of Experts in Turkey-Part I: Management, Diagnosis, and Follow-upUmay, E; Eyigor, S; Ertekin, C; Unlu, Z; Selcuk, B; Bahat, G; Karahan, AY; Secil, Y; Gurcay, E; Kiylioglu, N; Keles, BY; Giray, E; Tikiz, C; Gezer, IA; Yaliman, A; Sen, EI; Vural, M; Saylam, G; Akaltun, MS; Sari, A; Alicura, S; Karaahmet, F; Inanir, M; Demirhan, A; Aydeniz, B; Bilgilisoy, M; Yuksel, A; Ozcete, ZA; Calik, Y; Alemdaroglu, E; Keskin, D; Sahin, S; Oztekin, MF; Sezgin, B; Karaahmet, O; Bengisu, S; Gokler, TY; Mercimekci, SDysphagia is one of the most common and important complications of stroke. It is an independent marker of poor outcome after acute stroke and may become chronic after the acute period and continues to affect all aspects of the patient's life. Patients with stroke may encounter any of the medical branches in the emergency room or outpatient clinic, and as in our country, there may not be specialists specific for dysphagia, such as speech-language pathologists (SLP), in every hospital. This study aimed to raise awareness and create a common opinion of medical specialists for stroke patients with dysphagia. This recommendation paper has been written by a multidisciplinary team and offers 45 recommendations for stroke patients with dysphagia. It was created using the eight-step Delphi round via e-mail. This study is mostly specific to Turkey. However, since it contains detailed recommendations from the perspective of various disciplines associated with stroke, this consensus-based recommendation paper is not only a useful guide to address clinical questions in practice for the clinical management of dysphagia in terms of management, diagnosis, and follow-up, but also includes detailed comments for these topics.Item Best Practice Recommendations for Geriatric Dysphagia Management with 5 Ws and 1HUmay, E; Eyigor, S; Bahat, G; Halil, M; Giray, E; Unsal, P; Unlu, Z; Tikiz, C; Vural, M; Cincin, AT; Bengisu, S; Gurcay, E; Keseroglu, K; Aydeniz, B; Karaca, EC; Karaca, B; Yalcin, A; Ozsurekci, C; Seyidoglu, D; Yilmaz, O; Alicura, S; Tokgoz, S; Selcuk, B; Sen, EI; Karahan, AY; Yaliman, A; Ozkok, S; Ilhan, B; Oytun, MG; Ozturk, ZA; Akin, S; Yavuz, B; Akaltun, MS; Sari, A; Inanir, M; Bilgilisoy, M; Çaliskan, Z; Saylam, G; Ozer, T; Eren, Y; Bicakli, DH; Keskin, D; Ulger, Z; Demirhan, A; Calik, Y; Saka, B; Yigman, ZA; Ozturk, EABackground: Dysphagia is a geriatric syndrome. Changes in the whole body that occur with aging also affect swallowing functions and cause presbyphagia. This condition may progress to oropharyngeal and/or esophageal dysphagia in the presence of secondary causes that increase in incidence with aging. However, no study has been published that provides recommendations for use in clinical practice that addresses in detail all aspects of the management of dysphagia in geriatric individuals. This study aimed to answer almost all potential questions and problems in the management of geriatric dysphagia in clinical practice. Methods: A multidisciplinary team created this recommendation guide using the seven-step and three-round modified Delphi method via e-mail. The study included 39 experts from 29 centers in 14 cities. Results: Based on the 5W and 1H method, we developed 216 detailed recommendations for older adults from the perspective of different disciplines dealing with older people. Conclusion: This consensus-based recommendation is a useful guide to address practical clinical questions in the diagnosis, rehabilitation, and follow-up for the management of geriatric dysphagia and also contains detailed commentary on these issues.Item Best Practice Recommendations for Stroke Patients with Dysphagia: A Delphi-Based Consensus Study of Experts in Turkey-Part II: RehabilitationUmay, E; Eyigor, S; Ertekin, C; Unlu, Z; Selcuk, B; Bahat, G; Karahan, AY; Secil, Y; Gurcay, E; Kiylioglu, N; Keles, BY; Giray, E; Tikiz, C; Gezer, IA; Yaliman, A; Sen, EI; Vural, M; Saylam, G; Akaltun, MS; Sari, A; Alicura, S; Karaahmet, F; Inanir, M; Demirhan, A; Aydeniz, B; Bilgilisoy, M; Yuksel, A; Ozcete, ZA; Calik, Y; Alemdaroglu, E; Keskin, D; Sahin, S; Oztekin, MF; Sezgin, B; Karaahmet, ODysphagia is one of the most common and important complications of stroke. It is an independent marker of poor outcome following acute stroke and it continues to be effective for many years. This consensus-based guideline is not only a good address to clinical questions in practice for the clinical management of dysphagia including management, diagnosis, follow-up, and rehabilitation methods, but also includes detailed algorithms for these topics. The recommendation paper has been written by a multidisciplinary team and offers 117 recommendations for stroke patients with dysphagia. While focusing on management principles, diagnosis, and follow-up in the 1st part (45 items), rehabilitation details were evaluated in the 2nd part (72 items).Item Piezoelectric and magnetoelectric evaluations on PVDF/CoFe2O4 based flexible nanogenerators for energy harvesting applicationsKoç, M; Dönmez, CED; Parali, L; Sari, A; Aktürk, SIn this study, flexible PVDF/CoFe2O4 based nanogenerators were fabricated using composite fibers which were prepared by combining polyvinylidene difluoride (PVDF) and cobalt ferrite (CoFe2O4) nanoparticles (NPs: similar to 16 nm diameter) at a concentration of 1, 3, 5, 7, and 10 wt%. All of the flexible PVDF/ CoFe2O4 nanofibers were characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The incorporation of CoFe2O4 NPs into the PVDF leads to the formation a rich electroactive beta-phase in the composite structure. The piezoelectric properties of nanogenerators indicate that the nanogenerator based on the PVDF/CoFe2O4 fibers containing CoFe2O4 NPs at a concentration of 3 wt% has a greater power efficiency of 27.2% at 20 Hz compared to that of the nanogenerator with the pure PVDF fibers at 10 Hz, under the same resistive load of 2.5 M Omega. The results also show the magnetoelectric properties of the nanogenerator with PVDF + 10 wt% CoFe2O4 reached the highest voltage value of 18.87mV at the same load resistive load (2.5 M Omega) for a low-level magnetic field frequency of 50 Hz. The specially improved nanogenerators which have capability of producing electrical signals at the same time from mechanical and magnetic stimulations hold promise for the development of wearable electronics devices.