Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 10

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1
Content available remote

Determination of Natural Radioactivity in Aggregates from Western Mediterranean Region

100%
Pehlivanoğlu F., Kilinçarslan Ş.
|
|
vol. 125
|
issue 2
275-277
EN
Every material found in nature has a specific feature of the radioactivity. Depending on the degree of radioactivity, radioactivity effects are detrimental to human health. The use of these materials in the areas of human life can affect human health. Degree of radioactivity of these materials should be determined and usability of theirs should be controlled in buildings. In this study, determinations of natural radioactivity in aggregates used for construction were examined. As varieties of the aggregate of the region of Western Mediterranean: barite, olivine, tuff, aggregate, pumice, and andesite for the measurement of natural radioactivity was obtained. Materials were ground before they were used to determination of radioactivity and chemical analysis experiments. Of the powderized materials, by gamma-spectroscopic method there were carried out measurements of natural radioactivity in the Institute of Nuclear Sciences, Ege University. Degrees of natural radioactivity of materials that can be used as aggregate obtained from Western Mediterranean region were determined. The degree of radioactivity was compared with the values specified in the standards, the results were compared.
2
Content available remote

Determination of Radiation Shielding of Concrete Produced from Portland Cement with Boron Additives

81%
Davraz M., Pehlıvanoğlu H., Kilinçarslan Ş., Akkurt İ.
Acta Physica Polonica A
|
2017
|
vol. 132
|
issue 3
702-704
EN
Concrete is a material which is widely used for neutron shielding in such building constructions as nuclear power stations, particle accelerators and medical hospitals. Concrete is very significant for neutron shielding, because is contains some elements which help to moderate very penetrative fast neutrons. Boron increases the neutron shielding effectiveness of concretes. Boron can be added to concrete in different ways, by addition of boron to the water, used in concrete, or by addition of boron containing natural minerals. In this study, three samples of concrete were produced using B₂O₃ additives material, boron-modified active belite and Portland cement. Neutron absorption coefficients of the produced three different types of concrete samples were obtained through experiments. It is concluded that the addition of boron to concrete is an alternative option to be used for the purposes of neutron shielding.
3
Content available remote

Investigation of Relationships between Ultrasonic Pulse Velocity and Thermal Conductivity Coefficient in Foam Concretes

81%
Davraz M., Kilinçarslan Ş., Koru M., Tuzlak F.
Acta Physica Polonica A
|
2016
|
vol. 130
|
issue 1
469-470
EN
In this study, using type CEM I 42.5 R Portland cement, limestone powder, polypropylene fibers and super plasticizer, additive foam concrete specimens were produced. 28 days compressive strengths, dry densities, ultrasonic pulse velocities and thermal conductivity coefficient of these samples were determined. Analysing test results, it was noticed that there underlies a strong relationship between ultrasonic pulse velocity and thermal conductivity coefficient in the foam concrete. It is possible to estimate thermal conductivity by ultrasonic pulse velocity method, easy and credible method.
4
Content available remote

Predicting the Poisson Ratio of Lightweight Concretes using Artificial Neural Network

81%
Davraz M., Kilinçarslan Ş., Ceylan H.
Acta Physica Polonica A
|
2015
|
vol. 128
|
issue 2B
B-184-B-186
EN
Artificial neural network is generally information processing system and a computer program that imitates human brain neural network system. By entering the information from outside, artificial neural network can be trained on examples related to a problem, so that modeling of the problem is provided. In this study, compressive strength, Poisson ratio of the lightweight concrete specimens, which have different natural lightweight aggregates, were modeled with artificial neural network. The data which were provided by artificial neural network model were compared with the data obtained from experimental study and a good agreement was determined between the results.
5
Content available remote

Investigation of Properties of Foam Concretes Produced Using Pumice at Different Ratios

81%
Kilinçarslan Ş., Davraz M., Koru M., Ekıztaş F.
Acta Physica Polonica A
|
2017
|
vol. 132
|
issue 3
708-709
EN
Foam concrete is a type of light weight concrete having self-compacting properties. It can be obtained by mixing the foam, formed by the foaming agent, with a mixture consisting of cement, water and aggregate. It contains independent closed pores with a volume of 75-80% within its body. In this study, three series of foam concrete were produced using different ratio of pumice. Compressive strength, splitting tensile strength and thermal conductivity of foam concrete samples were determined for each density set. It is found that, pumice ratio has a linear relationships with dry bulk density, compressive strength, tensile strength and thermal conductivity. It can also be concluded that strong relationship exist between higher correlation coefficients and pumice ratio.
6
Content available remote

Influence of High Temperature on Concrete Produced from Portland Cement with Boron Additives

81%
Davraz M., Pehlıvanoğlu H., Kilinçarslan Ş.
Acta Physica Polonica A
|
2017
|
vol. 132
|
issue 3
872-874
EN
The boron compounds have been widely used as additives in the production of cement and concrete to enhance their engineering properties. In this study, three series of concrete specimens were produced using B₂O₃ additive materials, boron modified active belite cement and Portland cement. After 28 days of curing period the specimens were exposed to temperatures of 250, 500 and 750°C. Mass loss and compressive strength were determined and recorded after the specimens were cooled to room temperature. It was concluded that the effect of the boron becomes more apparent at high temperatures.
7
Content available remote

The Effect of Pumice Rate on the Gamma Absorption Parameters of Concrete

71%
Akkurt I., Akyildirim H., Mavı B., Kilinçarslan Ş., Başyığıt C.
Acta Physica Polonica A
|
2012
|
vol. 121
|
issue 1
144-146
EN
Since the technology concerning gamma radiation showed a rapid development, it became a necessity to be protected from it. One of the common shielding materials for this purpose is concrete. This study aims to give the effect of pumice rate on the gamma radiation attenuation coefficients of normal concrete (ρ = 2.476 g cm^{-3}) containing different rates of pumice mineral. Pumice, for which the Gölcük region in Isparta province is rich, is a volcanic originated spongy and porous mineral. Although it is a light material, it has a high comprehensive strength and heat resistance. So it became a common construction material in buildings. In the study, the variation of attenuation coefficients for concretes of different pumice rates were measured for 662, 1173 and 1332 keV photons using a NaI(Tl) detector. The experimental values were compared with the theoretical ones obtained by XCOM code.
8
Content available remote

Radiation Protection by the Barite Coated Fabrics via Image Processing Methodology

71%
Akarslan F., Molla T., Akkurt İ., Kilinçarslan Ş., Üncü I.
|
|
vol. 125
|
issue 2
316-318
EN
According to developing technology and conditions of modern life, use of radiation is rapidly increased. Unwittingly, our organs and tissues are exposed to radiation continuously. In order to avoid exposure to this radiation, some studies were carried out on protective clothing. In this study, radiation keeping properties of the fabrics coated with barite are examined. Radiation keeping properties were also determined by the method of image processing. After the experiments, it is determined that barite-coated fabrics absorb radiation better than normal fabrics.
9
Content available remote

Barite Effect on Radiation Shielding Properties of Cotton-Polyester Fabric

62%
Akkurt İ., Emikönel S., Akarslan F., Günoğlu K., Kilinçarslan Ş., Üncü İ.
Acta Physica Polonica A
|
2015
|
vol. 128
|
issue 2B
B-53-B-54
EN
Since creation of universe there has been radiation around us and this rate is getting higher with the development of technology. Thus radiation shielding becomes important subject for researcher. Besides normal people especially radiation workers in nuclear facilities need extra protection from radiation. This is vital if we think about any kind of nuclear leakage or nuclear attack, fabric becomes very important. For this purpose, cotton-polyester type of fabric has been coated by barite and gamma ray attenuation efficient has been obtained. The fabric was coated in different rate of barite (0%, 40%, 50% and 60%) in order to test effect of barite rate on the fabric. The measurement has been performed for gamma ray energy of 511, 662, and 835 keV using gamma spectrometer system with NaI(Tl) detector. It was found that the attenuation coefficient has increased with the barite coating rate on fabric.
10
Content available remote

Determination of Radiation Shielding Properties of Fabrics using Image Processing Method

62%
Kilinçarslan Ş., Üncü İ., Akkurt İ., Günoğlu K., Akarslan F., Coşkunsu S.
Acta Physica Polonica A
|
2017
|
vol. 132
|
issue 3
1171-1172
EN
It is extremely important to protect the human body from radioactive rays. Protective clothing can be used to absorb radiation because it is preferable to avoid the natural and artificial radiation exposure in our daily lives. There are many different types of fabric, used for clothes. In this study radiation absorbing properties of fabrics, which are widely used in the daily life, such as alpaca-type fabric, cotton fabric, cotton polyester blend fabric, woven dyed fabric and knitted fabric were examined using the image processing method.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.