Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Dertli, Enes(115)
- Kaya, Yunus(50)
- Ayata, Ümit(48)
- Şahin, Engin(48)
- İspirli, Hümeyra(46)
- Bayraktar, Bülent(42)
- Şenay, Volkan(41)
- Can, Zehra(39)
- Özen, Soner(37)
- Bayram, Sinan(35)
- Pat, Suat(35)
- Öztürk, Mesut(35)
- Ecem Bayram, Nesrin(34)
- Esmer, Yusuf(34)
- Battal, Fetullah(33)
- Artar, Musa(32)
- Öner, Erdal(32)
- Korkmaz, Şadan(31)
- Yilmaz, Mustafa Tahsin(31)
- Ertugrul, Mehmet(30)
- Mercan, Emin(30)
- Hasar, Ugur Cem(29)
- Kutlu, Naciye(28)
- Özdemir, Akın(27)
- Kul, Murat(26)
- Cuce, Erdem(25)
- Kamiloğlu, Aybike(25)
- Bayram, Ozkan(24)
- Sefali, Abdurrahman(24)
- Sert, Durmuş(24)
- Çolak, Murat(24)
- Ayazoglu, Rabil(22)
- Gıdık, Betül(22)
- Maden, Sedat(22)
- Ustabulut, Mete Yusuf(22)
- Uçurum, Metin(22)
- Akeren, Zahide(21)
- Dirican, Ebubekir(21)
- Kara, Yakup(21)
- Abdioglu, Murat(20)
Yayınlar
- MakaleYalnız künye2013The Views of Field Experts in Determining the Mathematic Questions for Seventh Class Level Exam’s
Kansu, Ceren Çevık; Bıçak, Bayram
The purpose of this study was to determine the level achieved in measuring the higher order thinking skills in 2008 seventh grade mathematic questions and the level of importance given to these higher order thinking skills, according to the views of field experts. The research group for this study consisted of 30 mathematics education experts at various universities in Turkey. Research data was provided via the “SBS exam seventh grade Identifying Higher Order Thinking Skills of Mathematics Scale” developed by Çevik (2009). The data was obtained by calculating the percentage and frequency integrated table. As a result of this research, examined by taking the percentage and frequency values of opinions above 50% into consideration, it was found that the mathematic questions in the 2008 SBS exam do not contain questions that measure higher order thinking skills. Also, the level of importance given to higher order thinking skills by experts in terms of 7th grade math acqusitions is very high. In structuring the questions for exams, carrying vital importance for students, opening the door to higher order thinking must be brought into the foreground
- MakaleYalnız künye2013The Investigation of Instructional Leadership Attitudes of Primary School Headmasters in Terms of Teacher Perception
Ergen, Yusuf
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AtıfTR Dizin1
İncele - MakaleYalnız künye2013An Example for The Effect of 5E Model on the Academic Achievement of Students: In The Unit of “Force and Motion”
Aksoy, Gokhan; Gurbuz, Fatih
The aim of this study is to compare the effectiveness of 5E model and teaching method and models suggested by course books developed based on Science and Technology teaching program and approved by Ministry of Education on seventh grade students’ academic achievements in the unit “Force and Motion”. The subjects of the study were 57 seventh grade students at a primary school in Erzurum, who were in two different classes and taught by the same teacher at 2011-2012 education year. One of the classes was randomly selected as experimental group (n=27) in which students were thought by means of activities which were prepared according to the 5E model, and the other was determined as the control group (n=30) in which students were thought by teaching method and models suggested by course books developed based on Science and Technology teaching program and approved by Ministry of Education. The main instruments for obtaining data were the Force and Motion Academic Achievement Test (FMAAT). The study results were analyzed by SPSS. The data obtained on instruments were evaluated by using descriptive statistic, independent samples t test, paired sample t test and effect sizes. As the result of the research revealed that experimental group in which students were thought by means of activities which were prepared according to the 5E model is more successful than control group in which students were thought by teaching in control group was carried out teaching method and models suggested by course books developed based on Science and Technology teaching program and approved by Ministry of Education in the unit “Force and Motion”
AtıfTR Dizin3İncele - MakaleYalnız künye2013Öğretmen Adaylarının Matematiğe Karşı Tutumlarının İncelenmesi
Küçük Demir, Betül; Kahraman, Sakip; Isleyen, Tevfik
Bu çalışmada öğretmen adaylarının matematiğe karşı tutumlarının bazı değişkenler açısından incelenmesi amaçlanmıştır. Bu amaçla, araştırmanın örneklemi Atatürk Üniversitesi, Kazım Karabekir Eğitim Fakültesi, Ortaöğretim Matematik Öğretmenliği (N=93) ve İlköğretim Matematik Öğretmenliği (N=148) bölümlerinde öğrenim gören toplam 241 öğretmen adayı olarak belirlenmiştir. Araştırmada veri toplama aracı olarak literatürden elde edilen "Matematiğe Karşı Tutum Ölçeği" kullanılmıştır. Elde edilen veriler istatistiksel olarak (ANOVA) analiz edilmiştir. Bulgular, öğretmen adaylarının öğrenim gördükleri bölümler açısından matematiğe karşı tutumlarında anlamlı düzeyde bir farklılık olduğunu ortaya koymaktadır. Aynı zamanda, analiz sonuçları cinsiyet ve sınıf düzeyi arasında önemli düzeyde bir etkileşimin olduğunu göstermektedir. Çalışmanın sonuçları derse karşı olan tutumun önemi açısından tartışılmıştır.
AtıfTR Dizin4İncele - MakaleYalnız künye2013Importance of proverbs and idioms as a means of language and culture transfer in turkish education and instruction
Bulut, Mesut
Each society prepares education programs suitable to their needs in order to maintain its existence and implements them. The existence of a state and its continuity directly depends on educational policies. The main purpose of these education policies is to foster unity and solidarity. The individuals’ gaining national awareness or national conscience, thinking multi dimensionally, expressing themselves, in short, asserting their existence, can be actualized with only education. In this regard the content of the education programs are very important. Teaching individuals language and culture, raising awareness, teaching the written and verbal literary works which compose the language and tongue depend on their being internalised. In accordance with the general goals of Turkish national education in order to adopt the politeness and loveliness of the language and to satisfy the individuals socially and culturally the students should be educated in parallel with the Basic National Education Law numbered 1739, Article 2 of the Law which states “the main purpose of Turkish National Education is to raise all the individuals of Turkish nation as citizens who rely on Ataturk’s principles and revolution and Ataturk nationalism which is stated in the Constitution, adopt, preserve, and develop the national, moral, humanistic, spiritual, and cultural values of Turkish nation, love their family and motherland and nation and try to glorify them, know their duties and responsibilities for civil rights and Turkish Republic , a democratic, secular and social and constitutional state which rely on the basic principles stated at the beginning of the Constitution and also behave accordingly ”. Therefore, proverbs and idioms, one of the important education-instruction tools in Turkish society which enable the social and cultural values to be adopted by the individuals and important cultural components of our nation, play an important role in language teaching, culture acquisition and transfer as it is appropriate to the goals of education programs. Proverbs and idioms have important effects in terms of making the narration effective, expressing what is said clearly, easily, understandably and express them in writing. In this regard they are the most important indicators of richness of Turkish and Turkish culture. Proverbs and idioms are indispensable for language learning skills which are reading, writing and speaking in Turkish education. Literature search model is used in this study and the aim of the study is to examine the importance of the proverbs, which play an important role in Turkish education and instruction, on the birth of the cultural values, their existence and transfer to the young generation. Moreover, the study focuses on the deficiencies in teaching proverbs and idioms and it aims at making contributions to the studies which are going to be conducted by presenting the importance and functions of proverbs and idioms in Turkish teaching
AtıfTR Dizin32İncele - MakaleYalnız künye2013Sosyal bilgiler dersinde sorgulayıcı-araştırma tabanlı öğrenme modeli: başarı ve öğrenmede kalıcılığın incelenmesi
İlter, İlhan
Bu araştırmanın amacı, Sosyal Bilgiler Dersi öğretiminde sorgulayıcı-araştırma tabanlı öğrenme modelinin öğrencilerin akademik başarı ve öğrenmede kalıcılıkları üzerine etkilerini incelemektir. Çalışmada Sosyal Bilgiler Dersinde sorgulayıcı-araştırma tabanlı öğrenme modelinin öğretimi ile öğrencilerin üst düzey düşünme becerilerini kullanmaları, bilgilerini genişletmeleri ve sınıf dışındaki dünyayla zengin bağlantılar kurmaları hedeflenmiştir. Araştırmada ön test ve son test kontrol gruplu yarı deneysel desen kullanılmıştır. Deneysel uygulama, Sosyal Bilgiler Dersi "Üretim, Dağıtım ve Tüketim" öğrenme gerçekleştirilmiştir. Araştırma 2012-2013 eğitim-öğretim yılı bahar yarıyılı döneminde Bayburt İli, Mahmut Kemal Yanbeğ Ortaokulu 5. sınıf öğrencileri ile yürütülmüştür. Beş hafta (15 saat) boyunca "Ürettiklerimiz" ünitesi konuları, deney grubunda Stripling SorgulayıcıAraştırma Tabanlı Öğrenme Modeli'nin aşamalarına uygun olarak geliştirilen etkinlikler; kontrol grubunda ise aynı ünite 5. sınıf Sosyal Bilgiler Dersi Öğretmen Kılavuz Kitabı'ndaki etkinlik ve yöntemlerle işlenmiştir. Araştırmada elde edilen sonuçlara göre, sorgulayıcıaraştırma tabanlı öğrenme modelinin 5.sınıf Sosyal Bilgiler Dersini "Öğretmen Kılavuz Kitabı"ndaki etkinlik ve yöntemlere göre işlemenin, öğrencilerin akademik başarı ve öğrenmede kalıcılık düzeyleri üzerinde yüksek derecede anlamlı bir etkisinin olduğu ve önemli katkılar sağladığı görülmüştür. Bu noktada yapılandırmacı Sosyal bilgiler dersi sınıflarında sorgulayıcı-araştırma tabanlı öğrenme modelinin kullanımı; öğrencileri çevrelerindeki dünya hakkında sorular sormaya, kendi sorularını cevaplamak için bilgiler toplamaya, sahip olduğu ön bilgi ve becerilerle topladığı bu bilgileri yorumlamaya ve kendi bulguları hakkında çıkarımda bulunmaya teşvik edebilir
AtıfTR Dizin12İncele - MakaleYalnız künye2013The relationship between the perception of transformational leadership and knowledge management capabilities: A case study on the kosgeb firms
Kahya, Cem; Naralan, Abdullah; Yıldız, İbrahim
The purpose of this study is to examine the relationships between the perceptions oftransformational leadership and knowledge based organization and organizational knowledgecreation process called knowledge management capabilities. The sample of this study was consisted of90 firms registered Republic of Turkey Small and Medium Enterprises Development Organization inErzurum. The survey study was conducted on the employees of these firms. As a result of the researchshowed that transformational leadership both affected knowledge based management andorganizational knowledge creation process significantly and positively, and knowledge based management has more effects on organizational knowledge creation process significantly andpositively.
AtıfTR Dizin1İncele - MakaleAçık Erişim2013The Attitudes of Parents Affecting Moral Maturity Levels of High School Students
Sengün, Mustafa
This study tries to analyze the attitudes of parents which may affect moral maturity levels of high school students. The study is based on field research. Field research was carried out on the 830 high school sudents selected randomly from some high schools took place in Samsun. Data of the study were collected by Moral Maturity Scale and Individual Acknowledgement Questionnaire developed by the researcher. Statistical analyses of data were done with variance analysis, t-test and Scheffe tests. Lastly, it was found that the attitudes of parents were the prominent factors affecting the moral maturity levels of high school students.
AtıfWoS2OpenAlex7
İncele - MakaleAçık Erişim2013DETERMINATION OF PHYSICAL PROPERTIES OF LAMINATED COMPOSITE BEAM VIA THE INVERSE VIBRATION PROBLEM METHOD
Balci, Murat; Gündogdu, Omer
In this study, some physical properties of a laminated composite beam were estimated by using the inverse vibration problem method. Laminated composite plate was modeled and simulated to obtain vibration responses for different length-to-thickness ratios in ANSYS. A numerical model of the laminated composite beam with unknown parameters was also developed using a two-dimensional finite element model by utilizing the Euler-Bernoulli beam theory. Then, these two models were embedded into the optimization program to form the objective function to be minimized using genetic algorithms. After minimizing the squared difference of the natural frequencies from these two models, the unknown parameters of the laminated composite beam were found. It is observed in this study that the Euler-Bernoulli beam theory suppositions approximated the real results with a rate of %0.026 error as the thickness of the beam got thinner. The estimated values were finally compared with the expected values and a very good correspondence was observed.
AtıfWoS3OpenAlex8İncele - MakaleYalnız künye2013The Natural Disasters in the Geography Teaching Curriculum
Degirmenci, Yavuz; Ilter, Ilhan
Disasters affect all aspects the communities and environment is a fact that we live on of our world. It takes place that types of natural disasters at different times and in types of the world and these affect people in many ways such as social, economic, and cultural. As it known that our country is an extremely risky structure in terms of natural disasters. Because of locating on the earthquake zones of Turkey's geographical position causes frequent to exposure earthquakes. In addition, existence of diversity of the earth surface, different climates, extreme situations, and lack of information about disaster education disaster awareness increase effect of disasters in our country. Education and training programs play an important role on disaster awareness and disaster education and formatting of human profile which is sensitive to environmental and compatible with environmental. From this perspective, geography lesson is an important on growing the consciousness of individuals who know his environment, aware of his boundaries and has awareness of natural disasters. The purpose of this study is determined how many activities, skills, values, techniques of measurement and evaluation, achievements, learning fields about natural disasters in the Geography Teaching Curriculum. This study used method of analysis document; it is exampled that sufficiency of Natural Disasters is in the program by based on current Geography Teaching Curriculum. The data obtained were analyzed using descriptive analysis. To results, it has seen that about achievements of natural disasters have been in the level of every grades. It has been determined that most of these achievements are levels of 9th the grade (f=24) the least is 12th grade (f=22). Analyzed the distribution of achievements by learning fields; it is intensity in the in the environment and society of learning field and it has been seen that it has observed less in the global environment: regions and countries of learning field.
- MakaleYalnız künye2013The Iddet Time and the Marriage of the Woman Waiting Iddet Time According To Islamic Law
Erdem, Suat
In the Islamic Law, Iddet means the disappearence of the marriage principles with the ending of the marriage because of any reasons and the time must be waited for another marrige by the woman. Iddet can be classified in two with regard of the causes of the action giving rise the divorce as the iddet of divorce and death, and it also can be subjected to a classification for the time of iddet as menstruation, pregnance and periodical iddet. As it is impossible to make a marriage proposal to a woman who is waiting the time of iddet directly or indirectly, there is an agreement on the subject of the impossibility of making a marriage proposal to a woman directly. As it is not possible to make a marriage proposal to a woman waiting iddet of death directly, an indirect proposal is possible only with an agreement. There is an agreement among the Islamic Lawyers on the subject of canceling the marriage which has taken place notwithstanding the ban, but the agreement isn't available about the marrige of the same couple after the time of iddet.
AtıfWoS1İncele - MakaleAçık Erişim2013Scopus SJRQ2Carbonic anhydrase activity from the gilthead sea bream (Sparus aurata) liver: The toxicological effects of heavy metals
Kaya, Elif Duygu; Söyüt, Hakan; Beydemir, Sukru
Many studies have shown that metal ions may lead to oxidative stress in biological systems. Accordingly, DNA damage, protein modification, enzyme inhibition and activation, lipid peroxidation and many other effects may occur in living organisms. Many different formations of metal ions may enter human cells along with water, air, and various foods, and humans are negatively affected by these conditions, either directly or indirectly. These effects may cause irreversible damage to human metabolism. In this study, the toxicological effects of heavy metals on carbonic anhydrase enzyme activity from the gilthead sea bream liver were investigated. The carbonic anhydrase enzyme was purified via affinity chromatography and had a specific activity of 6775.5 EU mg(-1). The kinetics and characteristic properties, such as optimum pH, stable pH, optimum temperature, activation energy (E-a), activation enthalpy (Delta H), Q(10), K-m, and V-max, were determined for the purified enzyme SDS-polyacrylamide gel electrophoresis showed a single band and molecular weight of the subunit was approximately 25 kDa. Cd(II), Cu(II), Ni(II) and Ag(I) inhibited the enzyme activity in vitro. The type of inhibition and K-i values for these metals were calculated from Lineweaver-Burk plots as 17.74 mM, 36.20 mM, 12.85 mM and 0.025 mM for Cd(II), Cu(II), Ni(II) and Ag(I), respectively. All the metals were noncompetitive inhibitors. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.
AtıfWoS27OpenAlex32
İncele - MakaleAçık Erişim2013Scopus SJRQ3Solid phase extraction of Cd(ii) and pb(ii) ions by a new carbothioamide derivative
Ozdes, Duygu; Duran, Celal; Bayrak, Hacer; Serencam, Huseyin; Basri Senturk, Hasan
An effective, simple, low cost and accurate sorption-spectrophotometric platform for the extractions and subsequent quantifications of Cd(II) and Pb(II) ions in food and environmental samples has been described in this dissertation. The separation and preconcentration of the analyte ions were accomplished by solid phase extraction method based on the adsorption of their N-(4-methylphenyl)-2-{[(4-phenyl-5-pyridin-4-yl-4H-1,2,4-triazol-3-yl)thio] acetyl} hydrazinecarbothioamide (MFPTAHK) complex on Amberlite XAD-8 resin in a mini column. The developed method was systematically investigated in different set of experimental parameters that influence the separation and preconcentration of Cd(II) and Pb(II) ions. The precision of the method was determined by reproducibility studies and expressed as relative standard deviations (RSD %) which were less than 4% for both analyte ions. The limits of detections (LODs) for Cd(II) and Pb(II) ions based on the three times the standard deviation of the blanks (N:10) were found to be 0. 31 ?g L-1 and 0. 86 ?g L-1, respectively. The developed SPE procedure was utilized for the simultaneous extraction and determinations of Cd(II) and Pb(II) ions levels in rice, cracked wheat and red lentil as food samples and various water samples.
AtıfScopus5WoS4OpenAlex5
İncele - MakaleYalnız künye2013Scopus SJRQ2The infrared, Raman, NMR and UV spectra, ab initio calculations and spectral assignments of 2-amino-4-chloro-6-methoxypyrimidine
Cinar, Z.; Karabacak, M.; Cinar, M.; Kurt, M.; Chinna Babu, P.; Sundaraganesan, N.
(Graph Presented) The 2-amino-4-chloro-6-methoxypyrimidine abbreviated as ACMP have been investigated by both the experimental and theoretical methods; through this work we provide the essential fact about the structural and vibrational insights. The optimized molecular structure, atomic charges, vibrational frequencies and ultraviolet spectral interpretation of ACMP have been studied by performing DFT/B3LYP/6-311++G(df,pd) level of theory. The FT-IR, FT-Raman spectra were recorded in the region 4000-400 cm -1 and 4000-50 cm-1 respectively. The UV absorption spectrum of the compound that dissolved in ethanol and water solution were recorded in the range of 200-400 nm. The scaled wavenumbers are compared with the experimental values. The difference between the observed and scaled wavenumber values of most of the fundamentals is very small. Based on the UV spectrum and TD-DFT calculations, the electronic structure and the assignments of the absorption bands were carried out. The 1H, 13C and DEPT 135 nuclear magnetic resonance (NMR) chemical shifts of the molecule were calculated using with the Gauge Including Atomic Orbital (GIAO) method and compared with experimental results. Besides, molecular electrostatic potential (MEP), frontier molecular orbitals (FMO) analysis were investigated using theoretical calculations.
AtıfScopus11WoS10OpenAlex11İncele - MakaleAçık Erişim2013Scopus SJRQ1Reference-plane invariant transmission-reflection method for measurement of constitutive parameters of liquid materials
Hasar, Ugur Cem; Barroso, Joaquim José; Kaya, Yunus; Ertugrul, Mehmet; Bute, Musa
We propose a new transmission-reflection method for measuring constitutive parameters of liquid samples inside an asymmetric measurement cell (a sample over a low-loss holder in vertical position inside an empty waveguide section). We derived reference-plane invariant expressions for constitutive parameters measurement of liquid samples from reference-plane dependent scattering parameters. In addition, we also applied a simple approach for unique determination of transformation factor and reference-plane distances. After, we also investigated how the performance of the proposed method could be improved by performing a differential uncertainty analysis. From this analysis, we found the following key results: (a) the accuracy of the proposed method could be enhanced for low-loss liquid samples by using thicker samples, and (b) the effect of constitutive parameters and the length of the (low-loss) sample holder on constitutive parameters measurements of liquid samples by the proposed method is a key parameter in increasing the accuracy of the measurements. Finally, we performed constitutive parameter measurements of distilled water and methanol to validate the proposed method and compared the proposed method with similar methods in the literature. From the measurements, we note that our method is especially useful for liquid sample measurements when the reference-plane transformation factors are not known a priori and/or if the measurements are carried out over a high frequency range.
AtıfScopus20WoS19OpenAlex22İncele - MakaleAçık Erişim2013Scopus SJRQ1Effect of ultrasonic treatment on reduction of Esherichia coli ATCC 25922 and egg quality parameters in experimentally contaminated hens' shell eggs
Sert, Durmus; Aygun, Ali; Torlak, Emrah; Mercan, Emin
Backround: In this study, hen eggs which were experimentally contaminated with Esherichia coli ATCC 25922 were used. Contaminated eggs were washed statically (S5 to S30; 0 kHz) and by ultrasonic waves (U5 to U30; 35 kHz) for given applications of time (5, 15 and 30 min), then the eggs were stored at 22°C for 14 days. Results: Depending on the time of ultrasonic application, a significant increase in egg shell strength (P < 0.01) was recorded. The highest value of the Haugh unit (67.93, 1 day) was observed on the eggs which were washed by ultrasonic waves. Yolk width values of ultrasonic washed eggs diminished. E. coli was completely removed by 30 min of ultrasonic application. During storage E. coli growth was not detected on the eggs which were washed by ultrasonic waves except the eggs in U5 group (2.04 log CFU eggshell-1) on the first day of storage. Conclusion: Depending on the time of ultrasonic application a significant increase in egg quality parameters (shell strength, albumen height, Haugh units, and yolk height) were observed. The application of ultrasound led to a significant reduction in E. coli numbers on egg shells.
AtıfScopus21WoS20OpenAlex21İncele - MakaleAçık Erişim2013Scopus SJRQ2New water mites of the family Hygrobatidae (Acari, Hydrachnidia) from Turkey
Esen, Yunus; Pešić, Vladimir; Erman, Orhan; Kaya, Yücel
In this study, the findings of three water mite species of the family Hygrobatidae collected from different streams in Turkey were evaluated. Hygrobates (s. str.) anatolicus Esen & Pešić, sp. n. is described as new for science. Hygrobates (Rivobates) diversiporus Sokolow, 1927 and Atractides (s. str.) nikooae Pešić, 2004, which were illustrated and thoroughly discussed, are new records for the Turkish fauna.
AtıfScopus9WoS6OpenAlex8İncele - MakaleAçık Erişim2013Scopus SJRQ4Analysis of amplitude and slope diffraction coefficients
Tabakcioglu, Mehmet Bariş; Cansiz, Ahmet
The diffraction mechanism is used for field prediction in both light and shadowed regions. Slope and amplitude diffraction coefficients are vital to predict the field strength at the receiver accurately. In this paper, amplitude and slope diffraction coefficients for one of the ray theoretical models, the slope uniform theory of diffraction with convex hull (S-UTD-CH) model, are analyzed. Moreover, diffraction coefficients are given for knife-edge and wedge structures.
- MakaleAçık Erişim2013Scopus SJRQ1Comparison of the effects of different types of tube inserts on two-phase flow instabilities
Omeroglu, Gokhan; Çomaklý, Omer; Karagoz, Sendogan; Karsli, Suleyman
Turbulence promoting inner elements such as rings, wings or winglets, twisted tapes, etc., is widely used in single- and two-phase flows. In this experimental work, the two-phase flow instabilities of forced convection boiling in a horizontal tube with ring- and twisted-tape-type inner elements inside are investigated. In order to analyze the two-phase flow of water, the experiments were conducted under a constant system pressure of 7.5 bar, and a constant heat input of 24 kW was applied to the outer surface of the circular test pipe with constant exit restriction. Three different inlet temperatures (Ti = 15, 25, and 35°C) were used to see the effect of inlet sub-cooling, and the mass flow rate was decreased from 110 to 20 g/s to obtain the characteristic curve. Two different pitch ratios for both the ring and twisted tape were evaluated in terms of stability. The results were evaluated in terms of appropriate variables for both the tube with insertions and the smooth tube. The analysis shows that the pressure drop increases with decreasing mass flow rate for all cases. The presence of the inner elements in the test pipe causes the boundaries of the oscillations to narrow in comparison with smooth tube. On the other hand, with the increase in the effective diameter of the test pipe the boundaries of the oscillations broaden. For each type of insertion, the increase of the pitch ratio makes the system less stable.
AtıfScopus4WoS3OpenAlex6İncele - MakaleYalnız künye2013Scopus SJRQ2Determination of structural, spectrometric and nonlinear optical features of 2-(4-hydroxyphenylazo)benzoic acid by experimental techniques and quantum chemical calculations
Cinar, Mehmet; Yildiz, Nihat; Karabacak, Mehmet; Kurt, Mustafa
The optimized geometrical structure, vibrational and electronic transitions, chemical shifts and nonlinear optical properties of 2-(4-hydroxyphenylazo)benzoic acid (HABA) compound were presented in this study. The ground state geometrical structure and vibrational wavenumbers were carried out by using density functional (DFT/B3LYP) method with 6-311++G(d,p) basis set. The vibrational spectra of title compound were recorded in solid state with FT-IR and FT-Raman spectrometry in the range of 4000-400 cm-1 and 4000-10 cm-1; respectively. The fundamental assignments were done on the basis of the recorded spectra and total energy distribution (TED) of the vibrational modes. The 1H and 13C NMR spectra were recorded in deuterated DMSO solution, and gauge-invariant atomic orbitals (GIAOs) method was used to predict the isotropic chemical shifts. The UV-Vis absorption spectra of the compound were observed in the range of 200-800 nm in ethanol, methanol and water solvents. To investigate the nonlinear optical properties, the polarizability, anisotropy of polarizability and molecular first hyperpolarizability were computed. A detailed description of spectroscopic behaviors of compound was given based on the comparison of experimental measurements and theoretical computations.
AtıfScopus19WoS19OpenAlex19İncele