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Wyświetlanie 1-15 z 19
Tytuł:
The Effect of Milling Speed on Particle Size and Morphology of Cu25W Composite Powder
Autorzy:
Biyik, S.
Aydin, M.
Powiązania:
https://bibliotekanauki.pl/articles/1194030.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Ev
Opis:
In this study, the effect of milling speed on particle size and morphology of Cu25W composite powder produced by high-energy ball milling was investigated. For this aim, commercial elemental copper and tungsten powders were milled in a planetary-type ball mill for different milling durations. Ball-to-powder weight ratio was selected as 10:1. Three different milling speeds, namely 200, 300, and 400 rpm were used throughout the tests. In order to avoid agglomeration and to decrease the tendency of cold welding among powder particles, stearic acid in amount of 2 wt.% was used as a process control agent. The morphological and microstructural evolution of the milled powders was evaluated by scanning electron microscopy. In addition, the variation of particle size and powder morphology as a function of milling duration was determined. As a result of this effort, the milling duration was found to have strong effect on the structural evolution of the powder, and the optimum particle size as a function of milling speed was determined.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1255-1260
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication and Arc-Erosion Behavior of Ag8SnO₂ Electrical Contact Materials under Inductive Loads
Autorzy:
Biyik, S.
Aydin, M.
Powiązania:
https://bibliotekanauki.pl/articles/1030286.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Ev
81.70.-q
07.50.-e
84.32.Dd
Opis:
In this study, Ag-based SnO₂-reinforced electrical contact materials were produced by powder metallurgy and mechanical alloying techniques. Elemental powder mixture containing 8 wt.% SnO₂ was milled in a high-energy planetary-type ball mill, to achieve homogeneously mixed composite powder, and subsequently pressed in a closed die to obtain green compacts with a cylindrical shape and then sintered under vacuum to obtain composites. Composites were then subjected to electrical wear tests under inductive loads to investigate the arc-erosion performance of electrical contacts. Surface deterioration and mass losses of electrical contacts were also evaluated, as a function of increasing switching number. Characterization of the starting and composite powders, green compacts, composites and arc-originated surface deterioration was carried out using scanning electron microscopy and energy-dispersive X-ray spectroscopy. It was found that powder particle size had decreased with the increasing milling time. Density and hardness values of the composites had increased, whereas porosity had decreased with the increasing sintering temperature. Optimum sintering temperature was determined as 900°C. The arc-affected zones became bigger with the increase of the number of switching operations. Furthermore, comparison between surface morphologies and mass losses of arc-eroded specimens had revealed that the stationary contacts exhibit higher rates of erosion than the movable contacts.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 339-342
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of Mechanical Alloying Parameters of Cu25W Electrical Contact Material
Autorzy:
Biyik, S.
Aydin, M.
Powiązania:
https://bibliotekanauki.pl/articles/1031274.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Ev
84.32.Dd
Opis:
In this study, the effect of mechanical alloying parameters, namely the effect of process control agent, ball-to-powder weight ratio and milling duration, on the synthesis of Cu25W composite powder was investigated. Planetary-type ball milling equipment was used to conduct mechanical alloying experiments. Stearic acid was used as the process control agent in order to establish a balance between cold welding and fracturing. The optimum amount of stearic acid was determined as a function of particle size and milling time at constant speed. By using this optimum amount of process control agent, three different ball-to-powder weight ratio values were also employed, and the effect of ball-to-powder weight ratio on particle size and morphology of Cu25W composite powders was investigated. The microstructural evolution of the milled powders was characterized using scanning electron microscopy and laser diffraction analysis. The test results have shown that the morphology and particle size distribution of the milled powders change significantly depending upon the milling parameters. In addition, higher ball-to-powder weight ratio values tend to lower the milling duration for the same amount of particle size reduction. However, particle size reduction suffers beyond the maximal value of ball-to-powder weight ratio, especially in the later stages of mechanical alloying.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 909-912
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the Effect of Different Current Loads on the Arc-Erosion Performance of Electrical Contacts
Autorzy:
Biyik, S.
Aydin, M.
Powiązania:
https://bibliotekanauki.pl/articles/1186764.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.70.-q
07.50.-e
84.32.Dd
Opis:
In this study, arc-erosion experiments using contactors were performed under inductive loads for up to 40000 switching operations to investigate the effect of different current loads on the arc-erosion performance of electrical contacts. Determination of the mass loss was performed after every 5000 operations. The arc-eroded surfaces were examined using scanning electron microscopy. The chemical composition near the arc was determined by energy dispersive X-ray spectroscopy. The results show that the contact surfaces are greatly affected by arc-erosion, resulting in mass loss due to material migration and/or evaporation. In addition, the arc-affected zones become bigger with the increase in the number of switching operations, especially at 20 A. However, electrical cleaning improves the contact performance by reducing the contact resistance due to breakdown of the non-conducting oxide films formed between 20000 and 25000 switching operations at 20 A. The stationary contacts experience major erosion, whereas the movable contacts suffered less contact erosion under each current load.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 656-660
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The frequency of chronic diseases and a health-promoting lifestyle in a group of elderly Romani people living in Northern Turkey
Autorzy:
Aydın, M.
Aydın-Avci, İ.
Powiązania:
https://bibliotekanauki.pl/articles/1918776.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
Chronic disease
elderly age
healthy lifestyle
Romani
Opis:
Purpose: To analyse the frequency of chronic diseases among Romani people who are sixty and older as well as their health-promoting lifestyle. Materials and methods: This research was conducted as a descriptive study between January 2015 and June 2015. The study included 98 elderly Romani people lived in Samsun, Turkey. The study data were collected using the questionnaire included 22 questions along with the Health-promoting Lifestyle Scale II. The statistical analysis of the data was made using percentage means, t-test, correlation, and ANOVA test. Results: The average age of the participating Romani people was 66.7±5.3. Of these Romani people, 83.7% had a chronic disease, and 80.6% had a medication that they used regularly. The mean score of the Romani citizens in the study sample on the Health-promoting Lifestyle Scale was 115.98±15.82. They obtained their highest score on the inter-personal relations sub-dimension and the lowest score on the stress management sub-dimension of the scale. There was a statistical correlation between the Romani people's gender, social insurance, income level, education level, family type, body mass index (BMI) and blood pressure monitoring and their scores on the scale (p<0.05). The study found that a health-promoting lifestyle did not affect the frequency of chronic diseases (p˃0.05). Conclusions: This study proved that the Romani people had risks of chronic diseases, did not attach sufficient importance to a health-promoting lifestyle and their health-promoting lifestyle is weaker compared to the elders in the rest of the population.
Źródło:
Progress in Health Sciences; 2018, 8(2); 75-84
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Awareness and health beliefs regarding cervical cancer and screenings of women living two different ethnic groups
Autorzy:
Aydın Avci, I.
Aydin, M.
Powiązania:
https://bibliotekanauki.pl/articles/1918938.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
Cervical cancer screening
early diagnosis
pap smear
risk analysis
Roma women
Opis:
Purpose: It is stated that the high mortality rate of cer-vical cancer worldwide can be reduced by early diag-nosis, effective observation, and treatment pro-grams. It was aimed to evaluate the correlation be-tween cervical cancer and screening and the health be-liefs of married women living in two different ethnic groups. Materials and methods: This research was con-ducted as a comparative descriptive study. 211 Roma (Gypsies) and 202 non-Roma married women included in the study. The data was obtained in the research by the introductory survey form and the "Cervical Cancer and Pap Smear Test Health Belief Model Scale". Per-centage, mean, t-test, chi-square tests were used in the evaluation of the data. A logistic regression analysis was used. Before the start of the research was received approval by the Ethics Committee. Results: The average age of the non-Roma women who participated in the survey was found 40.3 ± 10.5 (min: 20, max: 67). Non-Roma women were found to have received a pap-smear test at a higher rate (about 4 times more) than Roma women (p˂0.001, OR=3.723, 95%, CI 2.472, 5.607). Non-Roma women were found to have a higher pap-smear test rate (3-fold higher) than Roma women and found that the differ-ence between them was statistically significant (p˂0.001, OR=2.932, 95%, CI 1.855, 4.635). Conclusions: Roma women, a disadvantaged group, were found to hear fewer pap-smear tests, have less knowledge about the test, take fewer pap smears than non-Roma women and especially they did not have the pap-smear test because they did not know it.
Źródło:
Progress in Health Sciences; 2020, 10(2); 39-47
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Efficient Inductive Coil Link Design for Wireless Power Transfer to Visual Prostheses
Autorzy:
Celik, M.
Aydin, E.
Powiązania:
https://bibliotekanauki.pl/articles/1031436.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
wireless power transfer
inductive link
magnetic field
telemetry
visual prosthesis
Opis:
Powering therapeutic devices plays a crucial role in the design phase of implantable electronic units. Batteries could not provide sufficient charge storage, used for the lifetime of the device, considering the space available for them. As sophisticated surgical procedures are required with the possible trauma to the patient such as material discrepancy and tissue damage, replacement is quite risky and not an option. Thus, therapeutic devices, especially visual prostheses, receive power wirelessly through inductive coil links which are connected to a battery outside the body. An inductive link is based on the main principle that there are two components such as primary and secondary units. Although primary unit includes the battery outside the body, power transmitter, and control unit, secondary unit under the skin contains amplifier, rectifier regulators, and power control unit. In this study, an inductive coil link is modelled to evaluate fundamental design specifications for visual prostheses. Inductive coil link parameters are quantitatively investigated so that maximum power transfer efficiency and miniaturization, which are critically important for electronics placed in intraocular region, are provided. Considering 20 mm distance, it is concluded that the separation and the size of the coil pair, loop diameter, frequency have a major role to determine the system performance.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 535-537
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rheological Behavior of Modified Starch/EVA Blends
Autorzy:
Aydin, I.
Ergin, M.
Altun, M.
Powiązania:
https://bibliotekanauki.pl/articles/1195260.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
83.85.Cg
83.50.Xa
83.80.Mc
83.80.Tc
Opis:
There is a current research tendency towards the biodegradable thermoplastic materials from renewable resources since the environmental restraints play vital role in recent years. Starch is one of the renewable resources and abundantly available in the form of plant products. It is possible to blend starch with various thermoplastic materials to achieve such aims. In this study, an ethylene-vinyl acetate (EVA) copolymer resin (Luvax 40 W, DuPont) was blended with a modified starch (Maize Starch, Pendik Nisasta) in various amounts by means of a single screw extruder with different screw speeds. For this purpose, first starch was modified in a four neck spherical glass reactor. Modified starch was then blended with the EVA copolymer resin. Rheological analyses of these composites were performed by means of an AR G2 rheometer (TA Instruments) with parallel-plate geometry in a steady state condition. Rheological behavior and properties were recorded. The changes in viscosity with different temperatures, stress and strain dependence as well as general constitutive material behavior were determined in detail. As a result, the best formulation and process conditions were determined for the reasonable processability of starch/EVA blends from the obtained rheological data.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 503-505
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Rheological Behaviour upon Recycling of an Ethylene Vinyl Acetate Copolymer by Means of Twin-Screw Extrusion Process
Autorzy:
Fatih Ergin, M.
Aydin, I.
Powiązania:
https://bibliotekanauki.pl/articles/1032038.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
47.85.md
83.80.Sg
47.57.Ng
83.80.-k
81.20.Hy
Opis:
Recycling of many polymers has gained a spectacular importance mainly because of its environmental and economical benefits. Ethylene vinyl acetate is one of the thermoplastics used directly as a final product and indirectly as an additive within many other polymeric materials. There has been limited research work on recycling of polymers even though recycling in industry has shown a spectacular growth in the last decade. It is the aim of this study to investigate and to evaluate the rheological behaviour of an ethylene-vinyl acetate copolymer resin upon recycling. For this purpose, original ethylene vinyl acetate granules were processed five cycles by using a twin-screw extruder and their rheological analysis was performed by means of an AR-G2 rheometer (TA Instruments), with a parallel-plate geometry, under a steady state condition. It was found that the rheological measurements of copolymer ethylene vinyl acetate exhibited a shear thinning constitutive behavior, obeying Carreau-Yasuda rheological constitutive model. The changes in flow and oscillatory shear measurements under different processing conditions were also determined in detail and results are reported in the paper.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 542-544
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Examination of the Energy Efficiency of Wall Building Elements Used in Dwellings
Autorzy:
Vural, I.
Akgul, T.
Aydin, E.
Aydin, F.
Saribiyik, M.
Powiązania:
https://bibliotekanauki.pl/articles/1192343.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81
Opis:
In this study, within the scope of the number of studies related to the efficient use of energy increasing day by day, the thermal insulation performance of wall elements used in dwellings was determined using experimental methods. With this aim, a 1/3 scaled reinforced concrete structure with the complete characteristics of an actual structure, was built and the column spans were filled using six different types of wall element. These materials, widely used in dwelling production in Turkey, were applications of horizontal coring bricks, vertical coring bricks, pumice, gas concrete, block brick and a cavity wall. The interior temperature was kept constant by placing a thermal source inside the built sample construction and the temperatures for different exterior temperatures were measured with a thermocouple and camera from each wall surface. Thus, by interpreting the obtained surface temperature data, the energy efficiency of the wall types used was presented, the thermal conductivity resistance, thermal conductivity coefficient, and loss of heat as regards to TSE 825 were calculated and accordingly, the thermal conductivity performances of walls were compared.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1417-1420
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study on Hardfacing Alloy Using Fe-Cr and Fe-B Powders
Autorzy:
Karip, E.
Aydin, S.
Muratoğlu, M.
Powiązania:
https://bibliotekanauki.pl/articles/1401952.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Vj
Opis:
The aim of this study is the investigation of the effect of ferroboron and ferrochromium with massive wire based hardfacing alloys. Mixture of Fe-Cr and Fe-B powders was added to massive wire during welding process. Hardface layers were obtained by three different powder mixture and three different powder/massive wire proportions. Hardfacing was applied to two AISI 1020 steel substrates by open arc welding. Hardness test, scanning electron microscope and X-ray diffraction analysis were made to the samples. Test results showed that increasing ferroboron content and increasing powder mixture amount enhanced the microhardness of the specimens.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-160-B-163
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The correlation between death anxiety and anxiety in elderly with chronic obstructive pulmonary disease
Autorzy:
Nal, B.
Aydın Avcı, I.
Ayyildiz, M.
Powiązania:
https://bibliotekanauki.pl/articles/1917711.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
Elderly patients
chronic obstructive pulmonary disease
Death Anxiety
Anxiety
State Anxiety
Trait Anxiety.
Opis:
Purpose: This study aims to determine the correlation between death anxiety and anxiety in elderly patients with chronic obstructive pulmonary disease. Materials and methods: This study has been conducted on the individuals with chronic obstructive pulmonary disease (COPD) who were over 65 years. They received outpatient and inpatient treatment at a hospital. 171 elderly persons that were determined via power analysis were included in the research. Data was collected using a survey form, Death Anxiety Scale, State Anxiety Scale, and Trait anxiety scale. We used the following test statistics: t-test, ANOVA and Kruskal-Wallis Variance Analysis, and Pearson Correlation Test analysis. Results: 66.1 percent (113) of the participants are male and 33.9%(58) female; mean age is 726.83. The mean death anxiety score of the participants is 9.044.02. The mean State Anxiety score of elderly individuals with chronic obstructive pulmonary disease is 44.81.29; the trait anxiety mean score is 48.851.13. In those chronic obstructive pulmonary disease patients, we found a significant (p<0.001) correlation between state and trait anxiety, and that the latter two are high in cases where death anxiety is high. Conclusion: We found that death anxiety and anxiety are high in patients with COPD.
Źródło:
Progress in Health Sciences; 2016, 6(1); 63-69
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of the densification process on dowel tensile performance with different types of glues
Autorzy:
Ercan, E.
Aydin, K.
Özder, C.
Atar, M.
Powiązania:
https://bibliotekanauki.pl/articles/28407565.pdf
Data publikacji:
2022
Wydawca:
Instytut Badawczy Leśnictwa
Źródło:
Folia Forestalia Polonica. Series A . Forestry; 2022, 64, 4; 214-225
0071-6677
Pojawia się w:
Folia Forestalia Polonica. Series A . Forestry
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Composition, antioxidant and antimicrobial activities of cold-pressed and distilled essential oils of Origanum onites L. and Lavandula officinalis L. relationships evaluated by SEM microscopy
Autorzy:
Erturk, O.
Aydin, G.
Ayvaz, M.C.
Baskan, C.
Powiązania:
https://bibliotekanauki.pl/articles/2049191.pdf
Data publikacji:
2020
Wydawca:
Instytut Włókien Naturalnych i Roślin Zielarskich
Tematy:
Origanum onites
Lavandula angustifolia
essential oil
antioxidant activity
antimicrobial activity
morphological change
scanning electron microscopy
chemical component
gas chromatography-mass spectrometry
oregano
lawenda
olejek eteryczny
działanie antyoksydacyjne
analiza GC-MS
działanie przeciwdrobnoustrojowe
Opis:
Introduction: In order to prevent increased bacterial resistance, it is important to use herbal medicines with less side effects. Objective: In this study, the chemical composition, antimicrobial, antioxidant activities and SEM images of Lavandula officinalis and Origanum onites oils obtained in two different ways were determined. Methods: The antimicrobial activity of the oils was determined against reference and multiple strains of foodborne and pathogenic bacteria. The each essential oil sample were analyzed by GC–MS. Antioxidant activities of the samples were examined through DPPH• and ABTS•+ radical scavenging and FRAP assays. Results: The results indicate that the oils of obtained from Origanum onites and Lavandula officinalis exhibited relatively strong antibacterial and antifungal activity. In addition, the antioxidant activities detected were remarkable. Morphological changes in bacterial cells treated with essential oil samples were demonstrated with SEM images. In addition, the chemical components of the oil samples obtained by both water steam and cold press were revealed by GC-MS analysis and compared. Conclusion: When all the obtained results are evaluated together; these plants could be suitable for using as antimicrobial and antioxidative agents in several industries such as food, cosmetic, etc.
Źródło:
Herba Polonica; 2020, 66, 4; 43-54
0018-0599
Pojawia się w:
Herba Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and Optical Characterization of $TiO_2$ Thin Films Prepared by Sol-Gel Process
Autorzy:
Karabay, I.
Aydın Yüksel, S.
Ongül, F.
Öztürk, S.
Aslı, M.
Powiązania:
https://bibliotekanauki.pl/articles/1491461.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.-e
81.20.Fw
61.05.cp
Opis:
Titanium dioxide $(TiO_2)$ thin films were prepared by spin coating technique of sol precursor on Corning 7059 glass substrates. Spectral transmittances of as deposited and annealed samples were measured in the range of 250 to 1100 nm. Optical band gaps were calculated from the Tauc plots and was found to be about 3.78 eV for the annealed samples at 500°C. X-ray diffraction patterns were performed with as deposited and annealed samples. By annealing the samples at 500C in various annealing times, the structure has changed from amorphous to the anatase crystalline state. Variations of the band gap energy values of $TiO_2$ films with cobalt doping were also investigated. Cobalt doping decreased the band gap value of $TiO_2$ films down to 3.25 eV. X-ray diffraction patterns were also given for the doped samples.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 265-267
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 19

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