THE EFFECT OF PROJECT BASED ACTIVITIES WITH COOPERATIVE LERARNING METHOD ON THE ATTITUDES AND ACHIEVEMENT OF STUDENTS IN PHYSICS COURSE

Bu araştırma, işbirlikli öğrenme yöntemine dayalı proje destekli etkinliklerin öğrencilerin fizik dersine yönelik tutum ve başarılarına etkisini incelemek amacıyla yapılmıştır. Araştırma kontrol gruplu ön test ve son test modeline uygun deneysel bir çalışmadır. Araştırmanın örneklemini 2009-2010 eğitim-öğretim yılı birinci döneminde; Ankara ilinde eğitim veren özel bir ortaöğretim kurumunda 10.sınıf fen alanında okuyan 63 öğrenci oluşturmuştur. Araştırmanın evreni ise Ankara'da bulunan ortaöğretim okullarında fen alanında öğrenim gören öğrencilerdir. Bir deney ve iki kontrol grubu oluşturulmuştur. Sınıflardan rastgele yolla, 10A sınıfı deney grubu, 10B ve 10C sınıfları kontrol grubu olarak belirlenmiştir. Araştırmada işbirlikli öğrenme yöntemine dayalı proje destekli etkinlerle öğretim yöntemi ve geleneksel öğretim yöntemi olmak üzere iki farklı öğretim yöntemi kullanılmıştır Deney ve kontrol grubundaki öğrencilere fizik dersi başarı testi ve fizik dersine yönelik tutum ölçeği ön test ve son test olarak uygulanmıştır. Öğrenciler elektrik ünitesi ile ilgili proje konuları ile çalışmalarını gerçekleştirmiştir. Araştırmadan elde edilen verilen SPSS 17 istatistik programında analiz edilmiştir. Analizler sonucunda; işbirlikli öğrenme yöntemine dayalı proje destekli etkinliklerin, geleneksel öğretim yöntemine göre öğrencilerinin fizik dersine yönelik tutum ve başarılarını arttırmada daha etkili olduğu görülmüştür.This research has investigated the effect of project based activities with cooperative learning method on the attitudes and achievements of students attending physics course. In this research, pre-test/post-test control group design was used as an experimental design. In 2009-2010 first semester 63 science students were chosen as sample of the research. Whole science students at high school level in Ankara constituted the universe of the study. The first group was the experimental group while the other two groups were control groups. One of three classes, 10 A, was randomly assigned as experimental group while the other two, 10 B and 10 C, were randomly assigned as control groups. In this study two types of teaching method were used. These are project based activities with cooperative learning method and traditional method. The achievement test and the attitude scale for physics course were administered to students before and after two teaching methods. The students carried out activities with project subjects related to the electric unit. The study data was analyzed by SPSS 17 statistical program. The results showed that project based activities with cooperative learning method were more effective in increasing students' attitudes and achievements compared to traditional method

İSTANBUL-SARIYER İLÇESİNDEKİ BAZI TOPRAK ÖRNEKLERİNDE CS-137 KONSANTRASYONUN BELİRLENMESİ

DergiPark: 564877klujesÇevreselradyoaktivite genellikle doğal radyasyon ve yapay radyasyon olarak iki kısımdaoluşmaktadır. Yapay radyasyon; nükleer silah denemeleri, nükleer kazalar,nükleer tıp uygulamaları ve parçacık hızlandırıcılar sonucunda meydanagelmektedir. 2011 yılında Fukushima Daiichive 1986 yılında Çernobil’ de meydanagelen nükleer santral kazaları sebebiyle çevreye yoğun miktarda yapayradyoaktif nükleotitler saçılmıştır. Çernobil nükleer kazası İstanbul’ a yakınolduğu için, radyoaktif serpintiden etkilenme olasılığı yüksektir. Bu çalışmaİstanbul’un Sarıyer ilçesinde bazı toprak örneklerinde yapay radyoaktif maddeolan Cs-137 konsantrasyonun belirlenmesi amacıyla yapılmıştır. Çalışmabölgesinde 12 örnekleme noktası belirlenmiş, spektroskopik ölçümler, yükseksaflıkta germanyum detektör (HPGe) ile yapılmıştır. Cs-137 radyoaktivitekonsantrasyonları 1.70 ± 0,72 Bqkg-1 ile 16.43±1.26Bqkg-1arasında değiştiği bulunmuştur

Dependence of activity concentration of natural and artificial radionuclides on depth in soil samples from Antalya in Turkey

1st NUBA International Conference on Nuclear Physics and Astrophysics -- SEP 14-21, 2014 -- Akdeniz Univ, Antalya, TURKEYWOS:000354773900044In this study, we attempt to determine the dependence of activity concentration of natural (U-238, Th-232, K-40) and artificial (Cs-137) radionuclides on depth in soil samples from Antalya in Turkey. Soil samples were collected at different depths (0-10 cm, 10-30 cm, 30-50 cm, 50-70 cm, 70-100 cm and 100-200 cm). Each soil samples were counted by using a high purity Germanium detector (HpGe). For each soil sample, activity concentration, absorbed dose rate, radium equivalent activity, external and internal hazard index were calculated and compared with the published results

Determination of naturally occurring radionuclides in soil samples of Ayranci, Turkey

1st NUBA International Conference on Nuclear Physics and Astrophysics -- SEP 14-21, 2014 -- Akdeniz Univ, Antalya, TURKEYWOS:000354773900042The specific activity, radiation hazard index and the annual effective dose of the naturally occurring radioactive elements (U-238, Th-232 and K-40) were determined in soil samples collected from 12 different locations in Ayranci region by using a NaI(Tl) gamma-ray spectrometer. The measured activity concentrations of the natural radionuclides in studied soil samples were compared with the corresponding results of different countries and the internationally reported values. From the analysis, it is found that these materials may be safely used as construction materials and do not pose significant radiation hazards

Synthesis, spectroscopic and X-ray structural characterization, quantum chemical studies and investigation of gama-irradiated effects of the novel hydrazone compound: [(E)-3-(2-nitrophenyl)-(E)-1-(2-phenylhydrazono)]-1-phenylallylidene

The novel hydrazone compound, [(E)-3-(2-nitrophenyl)-(E)-1-(2-phenylhydrazono)]-1-phenylallylidene (2), has been synthesized, characterized by FTIR, 1H NMR, C-13 NMR techniques, elemental analysis, Xray structure analysis and has been investigated gama-irradiated effect. Additionally, the molecular geometrical parameters, frontier molecular orbital energies (HOMO, LUMO), their energy gap (AE), molecular electrostatic potential analysis of the compound have been calculated by using DFT/B3LYP with 6-311G (d, p) level. Also, IR frequencies, 1H and 13C NMR chemical shifts of the compound were calculated by using DFT calculations at the same level basis and changing in lattice parameters, unit cell volume and density of the compound are observed after gama irradiated at XRD data. Unirradiated state of the title compound (C21H17N3O2) crystallizes in the monoclinic space group P21/n with a = 9.1782(7) angstrom, b = 16.1359(12) angstrom,C = 11.9709(12) angstrom, beta = 101.022(8)degrees, V = 1740.2(3) angstrom(3), (Dcaic) = 13106 g/ cm(3) and Z = 4 while irradiated state of title compound showed significant changes in lattice parameters, crystal volume and density. In contrast, the crystal system is found to be the same at after and before irradiation. The calculated geometrical parameters, IR frequencies, H-1 and C-13 NMR chemical shifts of the compound were in good agreement with the observed single crystal- XRD data, IR, H-1 and C-13 NMR spectra. (C) 2016 Elsevier B.V. All rights reserved

Effect of CaF2 on the radiation attenuation properties of SiO2–P2O5–CaO–Na2O bioactive glasses: Theoretical and simulation studies

In this study, the gamma-photon, neutron, and charged particle interaction quantities for SiO2–P2O5–CaO–Na2O–CaF2 bioactive glasses were evaluated with the objective of estimating the effect of CaF2 on the physical and radiation responses of the bioactive glasses involved. The physical features (e.g. glass density) were increased as the CaF2 increases in the samples. The gamma mass-attenuation coefficient (μ/ρ) of the glasses was estimated for photon energies 0.015–15 MeV using the XCOM database and the FLUKA Monte Carlo simulation procedure. The total stopping powers (TSP) and range of charged particles (electrons, protons, α-particles, and C6+ ions) were estimated with the aid of ESTAR (for electrons only) and the SRIM Monte Carlo code (for protons, α-particles, and C6 + ions). In addition, the fast (ΣR) and thermal (TN) neutron cross-sections were computed for the glasses using standard theoretical models. The μ/ρ values of the SPCNCF glasses were within 0.0216–8.7469, 0.0217–9.2151, 0.0219–10.0588 and 0.0222–11.1264 cm2/g for SPCNCF1, SPCNCF2, SPCNCF3 and SPCNCF4, respectively. The half-value layers had minimum values of 0.02936, 0.02767, 0.02499, and 0.02215 cm for SPCNCF1, SPCNCF2, SPCNCF3, and SPCNCF4, respectively, at 0.015 MeV. Analysis of the estimated photon interaction parameters showed that the gamma radiation attenuation prowess of the glasses improved with CaF2 content. The same trend was observed for charged particles. The TSP of electrons is maximum at 0.015 MeV with values of 12.82 for SPCNCF1 and SPCNCF2, 12.76 for SPCNCF3 and 12.71 MeV cm2/g for SPCNCF4. The values of ΣR were equal to 0.0896, 0.0896, 0.0897 and 0.0900 for SPCNCF1, SPCNCF2, SPCNCF3, and SPCNCF4, respectively. The increase in the weight proportion of CaF2 also improved the fast neutron removal and total thermal neutron interaction capacities of the SPCNCF glasses. The SPCNCF glasses showed better shielding competence compared to some conventional shields such as RS 253 and RS 253 G18 commercial shielding glasses, concrete samples, and polymers