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    Wyświetlanie 1-12 z 12
    Tytuł:
    Enhanced Mechanical Performance of Aluminum Glass Fiber Reinforced Foam Material by Cu Modification
    Autorzy:
    Ertürk, A.
    Aydin, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033530.pdf
    Data publikacji:
    2017-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.05.Rm
    81.20.Ev
    81.70.Bt
    Opis:
    Glass fiber-reinforced aluminum foam and its modified forms, using 1 and 3 wt.% of Cu, were produced by powder sintering process, using spherical carbamide particles as space holders. The foams with 40 and 60 vol.% porosity fractions were successfully produced after water leaching and sintering procedures. Compression test was performed on foam samples to compare both, the compressive properties and energy absorption behavior of them. The composite foam samples with Cu modification have shown a higher compressive strength than the parent material foam. The average plateau stress and energy absorption capacity of foams produced in this study, achieved via utilizing 3 wt.% Cu, were 7.06 MPa and 3.51 MJ/m³, respectively.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 3; 470-473
    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:
    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:
    Influence of Aging Procedure on Bonding Strength and Thermal Conductivity of Plywood Panels
    Autorzy:
    Demirkir, C.
    Colakoglu, G.
    Colak, S.
    Aydin, I.
    Candan, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398989.pdf
    Data publikacji:
    2016-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    88.20.rp
    87.85.jf
    Opis:
    Wood and wood composite materials have been used in house, school, and office construction throughout the world. Wood composite materials are superior to other building materials in terms of thermal conductivity due to its porous structure. Bonding strength and thermal conductivity are two of many other significant properties of composite panels used in construction. It was essential to determine the effect of ageing process on the properties of panels used in structural applications. This study evaluates thermal conductivity and bonding strength of Scots pine and black pine plywood panels manufactured from rotary cut veneers dried at three different temperatures: 110°C, 140°C, and 160°C. Phenol formaldehyde (PF) and melamine urea formaldehyde (MUF) were used as adhesives for plywood manufacturing. Panels were exposed to ageing process according to ASTM C 481-99 standard. Plywood panels with five plies and 10 mm thickness were manufactured for each group. Thermal conductivity and bonding strength values of plywood panels were determined. Thermal conductivity of the panels decreased with increase of the drying temperature. It was also found that the thermal conductivity of test panels decreased after the ageing process. Shear strength mean values obtained from the samples of all plywood panels were above the limit value (1.0 N/mm²) indicated in TS EN 314-2 standard but those of the panels with MUF after ageing process.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 6; 1230-1234
    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:
    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:
    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:
    Synteza, charakterystyka, właściwości termiczne i elektrochemiczne polimerów iminowych zawierających jednostki pirydynowe i pirymidynowe
    Synthesis, characterization, thermal and electrochemical properties of imine polymers containing pyridine and pyrimidine units
    Autorzy:
    Karaer, H.
    Kaya, I.
    Aydın, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/947552.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    poli(iminy)
    poli(fenoksy-iminy)
    właściwości optyczne
    analiza termograwimetryczna
    półprzewodnictwo
    poly(imines)
    poly(phenoxy-imines)
    optical properties
    thermogravimetric analysis
    semiconductivity
    Opis:
    Polizasady Schiffa zsyntetyzowano metodą polimeryzacji utleniającej 2-hydroksybenzaldehydu (2-HBA) w środowisku alkalicznym, w obecności NaOCl jako utleniacza, a następnie szczepiono otrzymany polialdehyd za pomocą amin zawierających grupy pirydynowe i pirymidynowe. Uzyskane polimery charakteryzowano metodami GPC i SEM, a ich struktury potwierdzono za pomocą spektroskopii FT-IR, 1H NMR, 13C NMR i UV-Vis. Właściwości optyczne polizasad Schiffa analizowano spektroskopią fluorescencyjną i UV-Vis, a właściwości termiczne określono metodami TG, DTA i DSC. Korzystając z woltamperometrii cyklicznej (CV) oraz pomiarów przewodności ciała stałego metodą czteropunktową badano właściwości elektrochemiczne otrzymanych polimerów. Pomiary te wskazują na półprzewodnikowy charakter polimerów. Stwierdzono, że wartości liczbowo średniego ciężaru cząsteczkowego (Mn), wagowo średniego ciężaru cząsteczkowego (Mw) i stopnia polidyspersji (Đ) poli(2-hydroksybenzaldehydu) (P-2HBA) wyznaczone na podstawie analizy GPC są równe, odpowiednio, 5900, 5450 oraz 1,08. Szerokość elektrochemicznej przerwy energetycznej (E'g) oznaczono metodą CV, natomiast szerokość optycznej przerwy energetycznej (E'g) za pomocą spektroskopii UV-Vis.
    Schiff bases polymers were synthesized from 2-hydroxybenzaldehyde (2-HBA) via oxidative polymerization method in an aqueous alkaline medium in the presence of NaOCl as an oxidant. Then, these polymeric Schiff bases were prepared from the polyaldehyde by grafting each of them with different amines containing pyridine and pyrimidine groups. The structures of polymers were confirmed by FT-IR, 1H NMR, 13C NMR, and UV-Vis measurements. The polymers were characterized by GPC and SEM analyses. Furthermore, their optical properties were determined by UV-Vis and fluorescence spectroscopy, their electrochemical properties by cyclic voltammetry (CV) analysis and solid state conductivity measurements by the four-point probe technique, their thermal behavior by TG, DTA, and DSC measurements. The electrical conductivity of the polymers was also measured and found that they are semiconductive. The number average molecular weight (M'n), the weight average molecular weight (M'w), and dispersity (Đ) values of the polymers were found from GPC analysis and were equal 5900, 5450 and 1.08, respectively, for poly(2-hydroxybenzaldehyde) (P-2HBA) polymer. Electrochemical energy gap (E'g) was found by CV, whereas optical band gap (E'g) was determined by UV-Vis measurements.
    Źródło:
    Polimery; 2017, 62, 3; 170-180
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pre-concentration and flotation of alunitic kaolin and its possible use in ceramic tile industry
    Autorzy:
    Ediz, N.
    Tatar, I.
    Aydin, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/109656.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    alunitic kaolin
    kaolin flotation
    angobe
    ceramic tiles
    Opis:
    The aim of this research was to remove sulphur and alunitic parts by the flotation method from alunitic kaolin obtained from the Balikesir-Sindirgi region of Turkey, which is not currently used by the ceramic industry because of its high sulphur content. In the process, mineral alunite was floated while kaolinite was depressed. The effect of pre-concentration on the flotation process was also investigated. Pre-concentration included several processes such as wetting, mechanical scrubbing, and screening for removal of fine alunite particles and colouring oxides from kaolin as well as screening after consecutive milling for the separation of hard minerals such as quartz from kaolin. After the pre-concentration and flotation processes, kaolin concentrate having a SO3 content of 0.48% was obtained with a sulphur removal efficiency of 88.55%, and this kaolin was coded as F4. Afterwards, the use of F4 kaolin in the ceramic industry was investigated. For this purpose, the F4 kaolin was used in angobe preparation, and the angobes prepared were used for the production of floor and wall tiles. The properties of the angobes were also compared to those of commercial floor and wall tile angobes from a ceramic factory. These tests indicated that the floor and wall tile angobes prepared by using F4 kaolin could be used as an alternative for the angobes currently used by the factory.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 1; 213-231
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Fuel Contamination to Marine Lubricant on Friction Behaviors between Piston Ring and Cylinder Liner
    Autorzy:
    Aydin, Z.
    Savaş, Ö.
    Parlak, A.
    Keskin, İ.
    Ünlügençoğlu, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1186930.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.40.Pq
    81.05.Bx
    Opis:
    In internal combustion engines, friction losses caused by piston ring and cylinder liner pair account for approximately 20% of total mechanical friction losses as reported in literature. A reduction in friction between piston ring and cylinder liner pair would therefore result in higher efficiency, lower fuel consumption and reduced emissions. In this study, the effects of different types of fuel which is contaminated to cylinder oil have been tested for investigating the friction behavior between piston ring and cylinder liners pair by a reciprocating tester depending on the load, revolution and temperature. The results showed that lubricant type and revolution have been found significant on friction behavior.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 617-620
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    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 1-12 z 12

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