Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Dertli, Enes(116)
- Şahin, Engin(48)
- Kaya, Yunus(46)
- Özen, Soner(46)
- İspirli, Hümeyra(45)
- Pat, Suat(44)
- Şenay, Volkan(42)
- Korkmaz, Şadan(36)
- Yilmaz, Mustafa Tahsin(33)
- Kutlu, Naciye(32)
- Cuce, Erdem(31)
- Öner, Erdal(31)
- Artar, Musa(30)
- Ertugrul, Mehmet(29)
- Hasar, Ugur Cem(29)
- Mercan, Emin(28)
- Bayraktar, Bülent(27)
- Bayram, Sinan(27)
- Can, Zehra(25)
- Ecem Bayram, Nesrin(25)
- Çolak, Murat(23)
- Özdemir, Akın(23)
- Cuce, Pinar Mert(22)
- Sert, Durmuş(22)
- Ayata, Ümit(21)
- Bayram, Ozkan(21)
- Dirican, Ebubekir(20)
- Abdioglu, Murat(19)
- Ayazoglu, Rabil(19)
- Birinci, Ahmet(19)
- Kamiloğlu, Aybike(19)
- Gerçek, Yusuf Can(18)
- Taylan, Osman(18)
- Tozlu, Alperen(18)
- Gul, Volkan(15)
- Hasar, Ugur C.(15)
- Kadakal, Mahir(15)
- Sagdic, Osman(15)
- Ergün, Mustafa(14)
- Kadakal, Huriye(14)
Yayınlar
- MakaleYalnız künye2011Scopus SJRQ3The Effects of Nepotism and Favoritism on Employee Behaviors and Human Research Management Practices: A Research on Turkish Public Banks
Büte, Mustafa
The aim of this study is to analyze the effects of nepotism on employees' behaviors and human resources management practices in Turkish public banks. The data were collected via survey from the public banks operating in Ankara. Out of a total of 300 questionnaire forms distributed, 243 were used for analyses. Research model and hypothesizes that were designed via literature scanning, as a part of the objectives of the research, were subjected to Path Analysis using LISREL 8.54 statistical package program. The survey method was used for collecting data. The results of the research revealed that nepotism had significant negative effects on intention to quit, job satisfaction, organizational commitment and human resource management practices. Besides, human resource management practices were found to have positive significant effects on job satisfaction and organizational commitment.
AtıfWoS5
İncele - MakaleYalnız künye2011Scopus SJRQ4A systematic investigation on cryptognathid mites (Acari: Cryptognathidae) of Kelkit Valley (Turkey)
Dönel, Guldem; Dogan, Salih
In this study; cryptognathid mites collected from Kelkit Valley have been evaluated systematically. Three species belonging to the genus Cryptognathus Kramer, 1879 and six species belonging to the genus Favognathus Luxton, 1973 have been determined. Of these; Favognathus distortus (Kuznetsov, 1974) is new record for the Turkish fauna. In the introduction of the paper given on original description of this species, it has been mentioned that femur I has three setae as for all the species dealt with in the paper, but shown four setae on femur I in the figure. Khanjani & Ueckermann (2008) agreed to femur I with three setae in their identification key for all Favognathus. In Turkish specimens it has been determined that femur I bears four setae. One of the species determined from the research area, Favognathus kamili sp. nov., is new to science. The new species is similar to Favognathus dakotoensis (McDaniel & Bolen, 1979) and F. ochraceus (Summers & Chaudhri, 1965) in general appearance; however it can be distinguished from them by the anterior edge of hood smooth, dorsolateral punctations smaller size than centrals, coxa-sternal region without striae and reticulum, tc on tarsus II similar. Furthermore, it was decided that the Turkish specimens named as Favognathus orbiculatus (Livshitz) by Koc & Ayyildiz (1999), Dogan & Ayyildiz (2004), Akyol (2007) belonged to Favognathus kamili sp. nov. and these specimens subsequently were transferred to this new species. Additionally, the males of Favognathus bafranus Dogan, 2008 and the deutonymph females of Cryptognathus lagena Kramer, 1879 and Cryptognathus ozkani Dogan & Ayyildiz, 2001 have been found for the first time in this study.
AtıfWoS8İncele - MakaleYalnız künye2011Investigation of Usability of Basaltic Pumice Aggregate At Prefabricated Structure Light-Weight Concrete Components
Gökce, H. Suleyman; Simsek, Osman
At prefabrication, concrete which is 30 MPa and more compressive strength is generally used in the production of structure components such as colon, beam etc. In new generation productions, expected property of the components is not only compressive strength, but also tensile splitting strength, bond strength and lightness which provides advantage on movement and molding. In this study, the engineering properties of the concrete prepared by CEM I 42.5 R type cement by using pumice and normal aggregate were investigated On determination of compressive strength 100x200 mm sized cylinder sample, on determination of tensile splitting and bond strength 150x150x150 mm sized cube sample and O12 ribbed steel bar was used. It is found that light-weight concrete (LC) which was prepared with pumice aggregate is 30% lighter than normal concrete (NC) prepared with normal aggregate and at equal strength. According to the NC, the LC was obtained by 48% less tensile splitting strength and 15% less bond strength.
- MakaleAçık Erişim2011Scopus SJRQ2A new eyeless mite species of the genus Eustigmaeus Berlese (Acari: Stigmaeidae) from Turkey; [Türkiye'den Eustigmaeus Berlese (Acari: Stigmaeidae) cinsine ait gözsüz yeni bir akar türü]
Doǧan, Salih; Dönel, Güldem; Özçelik, Sezgin
A new eyeless mite species of the genus Eustigmaeus from Turkey, Eustigmaeus anophthalmus, is described and illustrated.
AtıfScopus27WoS27OpenAlex28
İncele - BildiriAçık Erişim2011The investigating pre-service teachers' learning styles with respect to the gender and grade level variables
Metin, Mustafa; Yilmaz, Gül Kaleli; Birişçi, Salih; Coşkun, Kerem; Akcamete, G; Uzunboylu, H; Oulmu, S; Karahoca, A; Babadoan, C; Ozdamli, F
The aim of this study is to investigate pre-service teachers' learning styles in terms of gender and grade level variables. The study was carried out at spring semester of 2010. The sample of the study consisted of 347 pre-service teachers at the Department of Primary and Science Teacher Education in Faculty of Education at Artvin Çoruh University. "Kolb Learning Style Inventory" was used as a data collection tool. The data were analyzed by using frequency, percentage, means, standard deviation, independent samples t-test and one-way ANOVA. The results show that the dominant learning style among the students is accommodator and it is followed by convergent, divergent and assimilator learning style. There was not significantly difference between students' learning style and gender and between students' learning style and grade level.
AtıfScopus7WoS7OpenAlex16İncele - MakaleAçık Erişim2011Scopus SJRQ2Determination of protein and gluten quality-related parameters of wheat flour using near-infrared reflectance spectroscopy (NIRS); [Yakın Kızılötesi Spektroskopisi (NIRS) kullanarak buǧday unlarının protein ve glutenle ilgili kalite parametrelerinin belirlenmesi]
Başlar, Mehmet; Ertugay, Mustafa Fatih
Wet chemistry analyses done for quality control purposes in wheat and flour processing are time-consuming. Near-infrared spectroscopy (NIRS) as an alternative technology to conventional methods allows us to obtain results in a few seconds. In this study, NIRS was used in the development of calibration models for protein, wet and dry gluten contents and Zeleny sedimentation of flours from the grinding of 120 varieties of bread wheat collected from different regions of Turkey. Therefore, spectra in the range of 1100 to 2500 nm of the flours were acquired by scanning with the NIRSystems 6500 monochromator. Multiple linear regression (MLR) and partial least squares (PLS) regression were applied to the spectral data in log 1/R, and first derivative and second derivative of log 1/R formats. Reasonable results were obtained for protein, wet and dry gluten contents, and Zeleny sedimentation with r = 0.985, 0.976, 0.953, and 0.924, respectively.
AtıfScopus41WoS38OpenAlex52İncele - MakaleAçık Erişim2011Scopus SJRQ2Airy's functions in nonlocal elasticity
Altan, Burhanettin S.
Nanostructured devices and materials, such as carbon nanotubes, Atomic Force Microscope, MEMS, etc. attract increasing attention in the scientific world. It has been realized that the classical elasticity is not capable to capture the mechanical behavior of them precisely. There is a wide consensus among the scientists that nonlocal elasticity is more capable than the classical counterpart to model the mechanical behavior of nanostructured materials and devices. In this paper a method which is useful for solving problems in nonlocal is introduced. Airy's stress functions for plane stress problems in nonlocal elasticity are studied. The nonlocal constitutive equations in integral form are discussed and a method is suggested to invert the constitutive equation which allows expressing strains in terms of stresses. A qualitative discussion is given on this inversion process. For the nonlocality kernel of exponential form, the differential equation for Airy's functions in nonlocal elasticity is obtained by introducing the strains into the compatibility condition. Appropriate polynomial forms for the Airy's function are considered and are applied to solve beam bending problems. The solutions are compared with their classical counterparts. The results are given in a series of figures and tables and are discussed in detail. This paper is concluded by indicating the implications of the presented study in nanomechanics and nanotechnology.
AtıfScopus1OpenAlex1İncele - MakaleYalnız künye2011Scopus SJRQ1Synthesis of sterically constrained tricyclic pyrrolidinyl alcohol ligands for the enantioselective ethylation of aryl aldehydes: Assessment of the influence of ring strain and N-alkyl chain length on asymmetric induction
Sahin, Engin; Kilic, Hamdullah
A series of chiral sterically constrained tricyclic pyrrolidinyl alcohol ligands were synthesized from the appropriate amino acids, and a comparative study of the activity and selectivity of the ligands for the enantioselective ethylation of aromatic aldehydes was carried out. The results obtained were compared with those previously reported for related monocyclic analogues; it was found that the bicyclo[2.2.2]octane backbone fused to pyrrolidine and the groups attached to the carbinol centre, as well as the chain length of the β-amino alcohol, had a marked effect on the enantioselectivity. The enantioselective addition of dialkylzincs to aryl aldehydes in the presence of ligands with diethyl substituents on the carbinol carbon afforded (R)-sec-alcohols in up to 99% enantiomeric excess (ee).
AtıfScopus5WoS5OpenAlex7İncele - BildiriAçık Erişim2011Mathematics teachers' views about measurement and evaluation dimension of new Turkish geometry curriculum
Yilmaz, Gül Kaleli; Alkan, Sevilay; Baran, Demet; Elmas, Hülya; Güven, Bülent; Akcamete, G; Uzunboylu, H; Oulmu, S; Karahoca, A; Babadoan, C
The aim of this study is to investigate mathematics teachers' views about measurement-evaluation dimension of new Turkish geometry curriculum. With this aim, 15 mathematics teachers who are selected from Artvin, Bayburt, Rize and Trabzon were carried out semi-structured interview. As a result, it was seen that teachers in our samples tend to apply traditional measurement and evaluation approach as they find the new measurement-evaluation dimension difficult and uneasy using the tools and methods. And the teachers are not aware of which tools are to be used in alternative measurement and evaluation approach or they do not know how to use it. Also, there are teachers who have negative views about new approach. These teachers have stated the main issue occurs due to time limitations, crowded classes, lack of tools and materials and density of class hours.
AtıfScopus1WoS1OpenAlex3İncele - MakaleYalnız künye2011Scopus SJRQ1A Taguchi approach for optimization of design parameters in a tube with coiled wire inserts
Gunes, Sibel; Manay, Eyuphan; Senyigit, Ercan; Ozceyhan, Veysel
This study presents the determination of the optimum values of the design parameters in a tube with equilateral triangular cross-sectioned coiled wire inserts. The effects of the design parameters such as the ratio of the distance between the coiled wire and test tube wall to tube diameter (s/D), pitch ratio (P/D), ratio of the side length of equilateral triangle to tube diameter (a/D) and Reynolds number (Re) on heat transfer and pressure drop were investigated by using Taguchi method. The Nusselt number and friction factor were considered as performance parameters. An L9(34) orthogonal array was chosen as experimental plan. The goal of this study is to reach maximum heat transfer (i.e. Nusselt number) and minimum pressure drop (i.e. friction factor). First of all, each goal was optimized, separately. Then, all the goals were optimized together, considering the priority of the goals. Contribution ratios for each parameter on the heat transfer and pressure drop were determined. Consequently, the optimum results were found to be s/D = 0.0357, P/D = 1, a/D = 0.0714 and Re = 19800.
AtıfScopus115WoS100OpenAlex113İncele - MakaleAçık Erişim2011Scopus SJRQ1Effect of photosonication treatment on inactivation of total and coliform bacteria in milk
Şengül, Mustafa; Erkaya, Tuba; Başlar, Mehmet; Ertugay, M. Fatih
The combined effect of simultaneously applied acoustic energy and ultraviolet irradiation (UV-C), named photosonication, on the population reduction of total and coliform bacteria in raw milk was investigated. Photosonication was carried out at 100% (120 μm; 240 W) amplitude of ultrasound accompanied by UV light of 13.2 W cm-2 while sonication was carried out at 100% amplitude without UV light. An ultrasonic processor (400 W and 24 kHz with a 22 mm diameter probe) and 3 ultraviolet lamps (4400 μW cm-2 per lamp) were used. The exposure time was 15 min for all treatment, and samples were taken after 0, 3, 6, 9, 12 and 15 min. Thermal treatment (at 65 °C for 30 min) achieved a 3.29 log and 5.31 log-reduction for total and coliform bacteria, respectively. However, the reduction achieved was 4.79 log cfu mL-1 and 5.31 log cfu mL-1 for total and coliform bacteria, respectively, in photosonication while 1.31 log cfu mL-1 and 4.01 log cfu mL-1 for total and coliform bacteria, respectively in sonication. During photosonication, UV light contributed to an increase of lethality.
AtıfScopus33WoS32OpenAlex39İncele - MakaleYalnız künye2011Scopus SJRQ1Waste utilization: The removal of textile dye (Bomaplex Red CR-L) from aqueous solution on sludge waste from electrocoagulation as adsorbent
Yilmaz, Alper Erdem; Boncukcuoglu, Recep; Kocakerim, Muhtar; Karakas, Ibrahim Hakki
The potential of removing Bomaplex Red CR-L dye from electro coagulation sludge has been investigated for different Bomaplex Red CR-L concentrations with varying adsorbent amount, temperature, pH and stirrer speed. Removal of Bomaplex Red CR-L is found to be high at lower pH values. The maximum adsorption of the dye has been achieved in aqueous solutions using 0.5g of calcinated sludge from electro coagulation at a pH of 2.0 within 20min. The Langmuir and Freundlich isotherm models were tested and it was found that the Langmuir equation was fitted better than the Freundlich equation. Maximum adsorption capacity (q m) was calculated as 192.31mg g -1 at 333K. In addition, the adsorption data obtained at various temperatures were successfully applied to pseudo first-order, pseudo second-order and intraparticle diffusion models. The rates of adsorption were found to conform to pseudo second-order kinetics with good correlation (R 2≥0.9997). This study showed that calcinated the sludge from electrocoagulation has a highly adsorbent capacity.
AtıfScopus62WoS55İncele - MakaleAçık Erişim2011Scopus SJRQ3A new species of Raphignathus Dugés (Acari, Raphignathidae) and newly discovered male of R. Fani Doǧan and Ayyildiz from Turkey
Dönel, Güldem; Doǧan, Salih
A new mite species, Raphignathus kelkitensis n. sp. and a newly discovered male of Raphignathus fani Doǧan and Ayyildiz from Turkey are described and illustrated.
AtıfScopus10WoS9OpenAlex8İncele - MakaleAçık Erişim2011Scopus SJRQ3The effects of silica fume and fly ash on the scaling resistance and flexural strength of pavement concretes
Yener, Engin; Hinislioǧlu, Sinan
The purpose of this study is to investigate the effects of Silica Fume (SF) and Fly Ash (FA) additives on the frost salt scaling resistance and flexural strength properties of pavement concrete. An attempt is also made to attain a more durable and higher strength concrete by a suitable combination of Ordinary Portland Cement (OPC), SF and FA. SF and FA are used as cement replacement in proportions of 0, 5, 10% and 0, 5, 10, 15% by weight respectively. Flexural strength is tested after 7, 28 and 91 days of the lime saturated water curing period. The experimental results indicate that using FA only decreases while SF only slightly increases 28-days flexural strength. On the other hand, using SF and FA together shows relatively more strength gain. Among all those tested, maximum 28 days flexural strength of 4.53 MPa is obtained for the mix proportions of 85% OPC + 10% FA and 5% SF. SF significantly decreases the amount of liquid absorption by capillary suction and has a significant effect on the scaling resistance. In addition, all the ternary mixtures showes better scaling resistance than the control mixture with 100% OPC.
AtıfScopus13WoS23İncele - MakaleYalnız künye2011Scopus SJRQ2Engineering properties of medium-to-fine sands injected with microfine cement grout
Mollamahmutoglu, Murat; Yilmaz, Yuksel
This article investigates the penetrability of microfine cement suspensions prepared with Rheocem 900 with and without superplasticizer additive into various graded fine-to-medium sands into which chemical grout permeation is only possible. Initially, the basic rheological properties such as viscosity, setting time, and stability of microfine cement suspensions are studied. In addition, penetration performance of the suspensions into various graded fine to medium sand specimens under different grouting pressures is examined. Finally, the strength and permeability characteristics of various graded fine-to-medium sand specimens permeated with microfine cement suspensions are studied. It is found that a superplasticizer additive greatly increases the grouting performance of microfine cement and reduces the grouting pressure. Moreover, it is seen that the unconfined compressive strengths of sand specimens permeated with a cement grout without additive are slightly less than those of sand specimens permeated with cement grout and superplasticizer additive. Further-more, permeability tests on specimens permeated with cement grouts with or without a superplasticizer reveals that all specimens are impermeable (k<1 10 7 m=s).
AtıfScopus73WoS65İncele - BildiriYayıncıda açık erişim2011Identifying the secondary school students' misconceptions about functions
Cansiz, Şükrü; Küçük, Betül; Lşleyen, Tevfik; Akcamete, G; Uzunboylu, H; Oulmu, S; Karahoca, A; Babadoan, C; Ozdamli, F; Kanbul, S
It is very important to identify and correct the mistakes that students make about mathematical concepts. The purpose of this study is to detect the secondary school students' misconceptions about functions in the 2009-2010 academic year. Research data was collected 61 students, included 9 th,10 th and 11 th grade students selected randomly, in Erzincan (2009-2010) academic year. Data collection tools consist of knowledge test and interviews. Frequency tables and percentages were used by analyzing students' explanations as answers to questions on the function information test. Pearson correlation was chosen to state the meaningful difference among the questions, if there is any, on the Function information test also included four different categories. Student, being believed to be in error, were interviewed with the help of data obtained from Function information test. As a result of the interview, it is most commonly observed that students make mistakes to understand whether a graphic is a function graphic or not, and about the demonstration of the table and function especially on the function information test.
AtıfScopus6WoS3OpenAlex12İncele - MakaleAçık Erişim2011Scopus SJRQ3Purification and characterization of a pectin lyase produced by Geobacillus stearothermophilus Ah22 and its application in fruit juice production
Demir, Nazan; Nadaroglu, Hayrunnisa; Tasgin, Esen; Adiguzel, Ahmet; Gulluce, Medine
Extracellular pectin lyase (PL) (EC 4.2.2.10) was produced by Geobacillus stearothermophilus Ah22 in solid state fermentation. The PL enzyme was purified 40.8-fold by DEAE-cellulose anion exchange column chromatography and characterized. The molecular weight of the enzyme was determined as 36 kDa by Sephadex G-100 gel filtration chromatography. Purification of the enzymewas verified by SDS-PAGE. The optimumpHand temperature of the enzyme were determined as pH 6.0 and 60°C, respectively. The PL was mostly stable at 40°C. Its activity deceased by 50% after 2 h at 60°C and by 60% after 6 h at 50°C. The V max and K m were calculated as 0.47 mg/mL and 355.3 μmol/L•min, respectively. The presence of 10 mM Ca 2+, Cu 2+, Mn 2+, Mg 2+, Zn 2+, Hg 2+, Fe 2+ and EDTA, L-cysteine and ascorbic acid significantly enhanced enzyme activity. The purified PL enzyme was used in the production of fruit juices; yields of fruits juice improved significantly compared with controls.
AtıfScopus35WoS28OpenAlex28İncele - MakaleYalnız künye2011Scopus SJRQ1Azathia crown ethers carrying pyrene pendant as receptor molecules for metal sensor systems
Ocak, Ümmühan; Ocak, Miraç; Parlayan, Semanur; Başoǧlu, Aysel; Çaǧlar, Yasemin; Bahadr, Zekeriyya
A series of crown ethers carrying a pyrene group with nitrogensulfur donor atoms, that differ in having three, four and five sulfur atoms in the macrocycle was designed and synthesized by the reaction of the corresponding macrocyclic compound and 1-bromomethylpyrene. The influence of metal cations such as Mn 2+, Fe2+, Fe3+, Co2+, Ni 2+, Cu2+, Zn2+, Cd2+, Hg 2+, Pb2+ and Al3+ on the spectroscopic properties of the ligands was investigated in acetonitriledichloromethane (1:1) by means of absorption and emission spectrometry. Absorption spectra show isosbestic points in the spectrophotometric titration of Fe2+, Zn2+, Cu2+, Pb2+ and Hg2+. The results of spectrophotometric titration experiments disclosed the complexation compositions and complex stability constants of the novel ligands with Fe 2+, Zn2+, Cu2+, Pb2+ and Hg 2+ cations. The monoazatetrathia crown ether showed good sensitivity for Cu2+ with linearity in the range 5.0×10-72. 5×10-6 M and detection limit of 1.6×10-8 M.
AtıfScopus9WoS9OpenAlex10İncele - BildiriYayıncıda açık erişim2011Investigation of university students' attitude toward the use of powerpoint according to some variables
Kahraman, Sakip; Çevik, Ceren; Kodan, Hülya; Karahoca, A; Kanbul, S
In this study it is aimed to investigate whether university students' attitudes toward the use of PowerPoint as a supporting teaching tool in the lectures change according to variables such as gender, academic units attended. For this purpose, the sample consisted of total 653 students who enrolled, Faculty of Education (N=287), Faculty of Engineering (N=125), School of Economics and Administrative Sciences (N=92) and Vocational School (N=149) in Bayburt University. Data was collected using "attitude toward the use of PowerPoint" scale. Additionally, students' opinions of the use of PowerPoint as a supporting teaching tool was collected from their responses to a questions form developed by researchers, then written documents analyzed to reveal their opinions with respect to the use of PowerPoint. The data obtained was statistically analyzed (ANOVA). It was found that there is no any statistically meaningful difference in the participants' attitude toward the use of PowerPoint in respect to gender, but there was significant difference in the participants' attitude toward the use of PowerPoint according to academic units attended. Recently, the findings were discussed in terms of the use of PowerPoint as a supporting tool in the lectures and its importance.
AtıfScopus11WoS14OpenAlex25İncele - BildiriAçık Erişim2011A study on developing an attitude scale towards multi-grade classrooms for elementary school teachers
Coskun, Kerem; Metin, Mustafa; Bülbül, Kenan; Yilmaz, Gül Kaleli; Akcamete, G; Uzunboylu, H; Oulmu, S; Karahoca, A; Babadoan, C; Ozdamli, F
The aim of this study is to develop an attitude scale towards multi-grade classrooms (AMC) for elementary school teachers who work in the Multi-grade Classrooms. The research was carried out with the total 215 elementary school teachers in Tokat and Samsun provinces in Turkey. The study carried out in five stages that are literature review, creating item pool, expert opinions, administer of scale and computing the reliability and validity. The five point rating scale consisted of 50 items was developed. The draft scale obtained has been applied to the total 205 elementary school teachers and as a result of factor analysis; the number of items in draft scale was reduced to 43. The Cronbach-Alpha internal integrity coefficient of the final version of the scale was found to be 0.81 after factor analysis was carried out. The scale has been ready to be used.
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