Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Dertli, Enes(47)
- Pat, Suat(29)
- Özen, Soner(29)
- Şenay, Volkan(24)
- Korkmaz, Şadan(23)
- Esmer, Yusuf(21)
- Şahin, Engin(21)
- Korkmaz, Özge(20)
- Cuce, Erdem(19)
- Öner, Erdal(18)
- Öztürk, Mesut(18)
- Artar, Musa(17)
- Yilmaz, Mustafa Tahsin(17)
- İspirli, Hümeyra(16)
- Ecem Bayram, Nesrin(15)
- Kaya, Yunus(15)
- Cinar, Mehmet(13)
- Cuce, Pinar Mert(12)
- Kamiloğlu, Aybike(12)
- Kutlu, Naciye(12)
- Mercan, Emin(12)
- Birinci, Ahmet(11)
- Bulut, Mehmet(11)
- Yaylacı, Murat(11)
- Bayram, Ozkan(10)
- Can, Zehra(10)
- Doğan, Zeki(10)
- Kahya, Cem(10)
- Karaali, Rabi(10)
- Pabuçcu, Hakan(10)
- Tosun, Figen Çam(10)
- Özdemir, Akın(10)
- Ayazoglu, Rabil(9)
- Battal, Fetullah(9)
- Bayram, Nesrin Ecem(9)
- Büte, Mustafa(9)
- Ertugrul, Mehmet(9)
- Kadakal, Mahir(9)
- Kaplan, Abdullah(9)
- Sarikaya, İsmail(9)
Yayınlar
- MakaleYalnız künye2017Scopus SJRQ2Harvesting of microalgae via submerged membranes: Flux, fouling and its reversibility
Elcik, Harun; Cakmakci, Mehmet
The purpose of this study was to investigate membrane fouling caused by microalgal cells in submerged membrane systems consisting of polymeric and ceramic microfiltration membranes. In this study, one polymeric (flat-sheet, pore size: 0.2 μm) and two ceramic (flat-sheet, pore size: 0.2 μm and cylindrical, pore size: 1 μm) membranes were used. Physical cleaning was performed with water and air to determine the potential for reversible and irreversible membrane fouling. The study results showed that substantial irreversible membrane fouling (after four filtration cycles, irreversible fouling degree 27% (cleaning with water) and 38% (cleaning with air)) occurs in the polymeric membrane. In cleaning studies performed using water and air on ceramic membranes, it was observed that compressed air was more effective (recovery rate: 87-91%) for membrane cleaning. The harvesting performance of the membranes was examined through critical flux experiments. The critical flux values for polymeric membrane with a pore size of 0.20 μm and ceramic membranes with a pore size of 0.20 μm and 1 μm were ≤ 95 L/m2hour, ≤ 70 L/m2hour and ≤ 55 L/m2hour, respectively. It was determined that critical flux varies depending on the membrane material and the pore size. To obtain more information on membrane fouling caused by microalgal cells, the characterization of the fouled polymeric membrane was performed. This study concluded that ceramic membranes with a pore size of 0.2-1 μm in the submerged membrane system could be efficiently used for microalgae harvesting by cleaning the membrane with compressed air at regular intervals.
AtıfScopus9WoS7OpenAlex7
İncele - MakaleYalnız künye2017Scopus SJRQ1An accurate model for photovoltaic (PV) modules to determine electrical characteristics and thermodynamic performance parameters
Cuce, Erdem; Cuce, Pinar Mert; Karakas, Ibrahim Hakki; Bali, Tulin
Accurate and reliable modelling of photovoltaic (PV) modules is necessary for design and performance estimation of PV systems. Manufacturers of PV modules usually provide some basic electrical parameters specified at only one single operating condition, which is commonly known as standard test conditions (STCs). However, PV systems operate over a wide range of outdoor conditions, and the manufacturers’ reports do not cover sufficient information about how the PV modules react with respect to changes in the two most important environment-oriented conditions, which are solar intensity and operating cell temperature. In this respect, an accurate and reliable tool is required by designers to predict electrical characteristics and thermodynamic performance parameters of PV modules. Therefore in this research, a novel mathematical model is developed to determine solar intensity and cell temperature dependency of PV module parameters and thermodynamic efficiency figures. A simple one-diode model is proposed considering series resistance and shunt conductance. Mitsubishi PV-UJ225GA6 225 W polycrystalline silicon PV module and Kyocera KD205GH-2P 205 W multicrystal PV module are utilised for model assessment. Model results are compared with environmental chamber tests and manufacturers’ performance reports, and a very good agreement is achieved.
AtıfScopus97WoS85OpenAlex110İncele - BildiriYalnız künye2017Analysis of turbulent convective heat transfer from rectangular baffles by Taguchi method
Sahin, B.; Bayrakceken, A.; Manay, E.; Ates, I.
In this study, the effects of the rectangular baffles mounted on the bottom surface of a heat exchanger on the heat and pressure drop characteristics were investigated using the Taguchi experimental-design method. Nusselt number and friction factor were considered as performance parameters. An L18(2135) orthogonal array was selected as an experimental plan for the six parameters: corner angle (α), inclination angle (β), baffle height (H), baffle length (L), baffle width (S) and Reynolds number. First of all, each goal was optimized, separately. Then, all the goals were optimized together, considering the priority of the goals. The presence of the rectangular cross sectioned baffles caused higher pressure drop than that of the smooth channel. It was concluded that increasing inclination angle and corner angle caused heat transfer to decrease. The length of the baffle was found to be the most influential parameter on friction factor. Likewise, it was concluded that the most affected parameter on the heat transfer was Reynolds number.
- MakaleYalnız künye2017Scopus SJRQ4Bioactive content of Rosa canina biotypes from Turkey
Beyhan, O.; Koc, A.; Ercisli, S.; Jurikova, T.; Cakir, O.
Rose hips have been used as medicinal and aromatic plants for a long time throughout Turkey. The plant has been the focus of many recent studies due to its potential effects on treatment and prevention of several diseases. However, there are few in vitro studies concerning its composition and antioxidant capacity. The aim of the present study was to determine bioactive content including ascorbic acid, total phenolics, total flavonoids, total carotenoids and antioxidant activity of Rosa canina biotypes growing wild in Sivas province located eastern Anatolia. The results revealed that fruits of Rosa canina biotypes rich in terms of Vitamin C which ranged from 360 to 482 mg/100 g fresh weight base. The total phenolic content varied from 340 to 464 mg/100 g fresh weight. The biotype S-07 had the highest total flavonoids content (241 mg quercetin equivalent/100 g fresh weight) and the lowest value attributed to biotype S-01 as 151 mg/quercetin equivalent/100 g fresh weight. The antioxidant activity of the biotypes was between 14.2-30.7 μg Trolox/ml sample. The results revealed that there was enough diversity among Rosa canina biotypes for bioactive content and promising biotypes with high bioactive content are ready material for future breeding activities.
AtıfScopus4İncele - MakaleYalnız künye2017Scopus SJRQ1Purification of camel liver catalase by zinc chelate affinity chromatography and pH gradient elution: An enzyme with interesting properties
Chafik, Abdelbasset; Essamadi, Abdelkhalid; Çelik, Safinur Yildirim; Mavi, Ahmet
Climate change and increasing temperatures are global concerns. Camel (Camelus dromedarius) lives most of its life under high environmental stress in the desert and represent ideal model for studying desert adaptation among mammals. Catalase plays a key role in protecting cells against oxidative stress. For the first time, catalase from camel liver was purified to homogeneity by zinc chelate affinity chromatography using pH gradient elution, a better separation was obtained. A purification fold of 201.81 with 1.17% yield and a high specific activity of 1132539.37 U/mg were obtained. The native enzyme had a molecular weight of 268 kDa and was composed of four subunits of equal size (65 kDa). The enzyme showed optimal activity at a temperature of 45 °C and pH 7.2. Thiol reagents, β-Mercaptoethanol and D,L-Dithiothreitol, inhibited the enzyme activity. The enzyme was inhibited by Al3+, Cd2+ and Mg2+, whereas Ca2+, Co2+ and Ni2+ stimulated the catalase activity. Reduced glutathione has no effect on catalase activity. The Km and Vmax of the enzyme for hydrogen peroxide were 37.31 mM and 6185157 U/mg, respectively. Sodium azide inhibited the enzyme noncompetitively with Ki value of 14.43 μM, the IC50 was found to be 16.71 μM. The properties of camel catalase were different comparing to those of mammalian species. Relatively higher molecular weight, higher optimum temperature, protection of reduced glutathione from hydrogen peroxide oxidation and higher affinity for hydrogen peroxide and sodium azide, these could be explained by the fact that camel is able to live in the intense environmental stress in the desert.
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İncele - MakaleYalnız künye2017Scopus SJRQ2Mechanism of capsaicin inhibition of aldose reductase activity
Alim, Zuhal; Kilinc, Namık; Sengul, Bulent; Beydemir, Sukru
Aldose reductase (AR) inhibitors play a vital importance as a potential therapeutic and preventive medicine when it comes to hyperglycemia associated diabetic complications. Additionally, capsaicin is used as a food additive and a drug in a number of diverse clinical trials. The aim of this study is to determine the in vitro inhibition behavior of capsaicin on AR enzyme activity, which was obtained from different rat tissues (heart, kidney, liver, and brain). We showed that AR was inhibited by capsaicin in the micromolar range and noncompetitive manner in all of the tissues. Ki values of capsaicin were found to be 8.87, 264, 535, and 597, respectively, in heart AR, kidney AR, liver AR, and brain AR. In conclusion, capsaicin may be an effective molecule when used in low concentrations to prevent diabetic complications associated with the polyol pathway.
AtıfScopus21WoS19OpenAlex24İncele - MakaleYalnız künye2017Scopus SJRQ4Structural investigation, drug likeness scoring and structure activity/property relationships applied on 1,2,3-thiadiazole derivatives, with kinase inhibitors activity
Oukil, Oualid; Tchouar, Noureddine; Belaidi, Salah; Salah, Toufik; Cinar, Mehmet
All calculations and the equilibrium geometries of 1,2,3-thiadiazole have been performed using ab initio/HF, MP2 and DFT methods with different basis sets. The molecular electrostatic potential surface (MESP) that reveals centers of reactivity of the molecule and substitution effects of the molecular system have been studied using the HSAB principle (Hard Soft Acid and Base). Also, the multi-parameter optimization (MPO) methods and structure activity/property relationship studies were carried out on twenty-one molecules of 1,2,3-thiadiazole derivatives which are potent VEGFR-2/KDR kinase inhibitors. In the present work results such as net charges, bond lengths, dipole moments, QSAR properties, Lipinski’s parameters, Lipophilic Efficiency (LipE), have been calculated and discussed. (Figure Presented).
AtıfScopus7İncele - MakaleYalnız künye2017Scopus SJRQ1A study on some physical properties of a Pb-doped GaAs thin film produced by thermionic vacuum arc
Şenay, Volkan; Özen, Soner; Pat, Suat; Korkmaz, Şadan
A 155 nm Pb-doped GaAs thin film was deposited on a glass substrate by means of the thermionic vacuum arc technique in 30 s using GaAs and Pb pellets as source materials. Tools and techniques such as an optical reflectometer, UV-VIS-NIR spectrophotometer, FESEM, EDX, AFM and optical tensiometer were employed to investigate the physical properties of the produced film. From the optical investigations, the refractive index at the wavelength of 632.8 nm and optical band gap of the film were found to be 4.03 and 1.13 eV respectively. It was observed that Pb doping increased the value of refractive index and decreased the band gap value. A uniform surface morphology with fine grain covering the entire surface was observed through the FESEM and AFM studies while 50–80 nm grain size and 2.22 nm root mean square roughness values were obtained. The EDX analysis confirmed the presence of Ga, As and Pb elements in the film. The wetting experiments revealed that the contact angle value was dependent on the liquid used. The surface free energy calculated with OWRK/Fowkes and Equation of State approaches were about 26 mN/m.
AtıfScopus6WoS6OpenAlex5İncele - MakaleYalnız künye2017Scopus SJRQ2The surface morphology research of the BGaN thin films deposited by thermionic vacuum arc
Özen, Soner; Pat, Suat; Şenay, Volkan; Korkmaz, Şadan
In this paper, BGaN thin films with two different thicknesses were deposited on two different substrates and their surface morphologies were investigated. The amorphous glass and semi-crystalline polyethylene terephthalate substrates were selected. At the same time, two different deposition angles are selected with a view to the effect of deposition angle on surface morphology. The surface and optical properties were determined by using X-ray diffractometer (XRD), atomic force microscope (AFM), spectroscopic ellipsometry (SE) and optical interferometer. The thicknesses of thin films on substrates are about 30 nm and 40 nm. According to the atomic force microscope images, small-dimensional grains observed on relatively large grains. The roughness values of the thin films on the polyethylene terephthalate substrate are lower than on the glass substrate.
AtıfScopus10WoS9OpenAlex10İncele - MakaleYalnız künye2017Scopus SJRQ2Adsorptive properties of As(III) from aqueous solution using magnetic nickel ferrite (NiFe2O4) nanoparticles: Isotherm and kinetic studies
Karcioğlu Karakaş, Zeynep; Boncukcuoğlu, Recep; Karakaş, İbrahim Hakkı
As(III) adsorption on NiFe2O4 nanoparticles were systematically investigated by controlling parameters such as stirring rate, pH, initial arsenic concentration, contact duration, temperature, and adsorbent dose. It was observed that the amount of adsorbed arsenic concentration is strongly depended on pH and temperature. The temperature and pH give rise to significant changes in the amount of adsorbed arsenic. As compared with Langmuir and Freundlich isotherms models, the latter is found to be well suited. Pseudo-first order, pseudo-second order, and intraparticle diffusion models were applied to adsorption equilibrium data obtained from the analysis of arsenic with diverse amount of initial concentration.
AtıfScopus12WoS13OpenAlex11İncele - MakaleYalnız künye2017Scopus SJRQ2Solar Pond Window Technology for Energy-Efficient Retrofitting of Buildings: An Experimental and Numerical Investigation
Cuce, Erdem; Cuce, Pinar Mert
Windows are responsible for an important proportion of heat loss from building envelope due to inadequate insulative characteristics of traditional glazing products. In this respect, advanced glazing solutions are of vital importance to mitigate energy demand of buildings, thus to reduce carbon emissions. Therefore, in this research, a novel glazing technology called solar pond window is introduced, and it is numerically and experimentally investigated for different design configurations. The optimum design of this novel glazing covers four 5-mm-thick glass panes, two 20-mm-thick water layers, and one 20-mm-thick Krypton layer in the middle. The average heat transfer coefficient (U-value) of the optimum case is found to be about 0.40 W/m 2 K. If air is used as insulative gas in the interlayer, the U-value of the glazing is determined to be around 0.90 W/m 2 K, which is still competitive with the U-value range of argon-filled triple-glazed windows with low-e coatings. The fabrication cost of the optimum design of solar pond window is around €120/m 2. Overall, solar pond window technology is a cost-effective and energy-efficient glazing, which has a great potential to be the future of fenestration products as well as being capable of meeting the latest building fabric standards.
AtıfScopus10WoS7OpenAlex9İncele - MakaleYalnız künye2017Scopus SJRQ3Continuous contact problem of a functionally graded layer resting on an elastic half-plane
Öner, E.; Adiyaman, G.; Birinci, A.
In this study, the continuous contact problem of a functionally graded layer resting on an elastic half-plane and loaded by a rigid rectangular stamp is examined. The problem is solved assuming that the functionally graded (FG) layer is isotropic and the shear modulus and mass density vary exponentially throughout the layer's thickness. However, the body force of the elastic half-plane is neglected. In addition, it is assumed that all surfaces are frictionless and only compressive stress is transferred along the contact surfaces. The mathematical problem is reduced to a singular integral equation in which the contact stress under the rigid stamp is unknown using the Fourier integral transform and boundary conditions related to the problem. This singular integral equation is solved numerically using the Gauss-Chebyshev integration formula. The dimensionless contact stress under the rigid stamp, the initial separation loads and the initial separation distances between the FG layer and the elastic half-plane are obtained for various dimensionless quantities.
AtıfScopus26İncele - MakaleYalnız künye2017Scopus SJRQ2The Al doping effect on the surface, optical, electrical and nanomechanical properties of the ZnO and AZO thin films prepared by RF sputtering technique
Pat, Suat; Mohammadigharehbagh, Reza; Özen, Soner; Şenay, Volkan; Yudar, H. Hakan; Korkmaz, Şadan
In this study, ZnO and aluminum doped ZnO (AZO) thin films were deposited at constant RF power of 100 W for the determine of the structural, surface, optical, electrical and nanomechanical properties. X–Ray diffraction (XRD), atomic force microscopy (AFM), nanoindentation technique and UV–Vis spectrophotometer were used. ZnO (100) and ZnO (004) orientations were detected in the ZnO and AZO films. The crystallite size values for the films were calculated as to be as 35 nm and 20 nm for ZnO and AZO thin films, respectively. It was found that the roughness values decreased to 3.15 nm from 5.15 nm for AZO and ZnO films, respectively. The hardness values of the ZnO and AZO thin films are measured as 7 GPa and 11 GPa. Young's modulus values were determined as 155 GPa and 95 GPa for ZnO and AZO films, respectively. The ZnO and AZO thin films have high transparency.
AtıfScopus50WoS50OpenAlex57İncele - BildiriYalnız künye2017Antiproliferative and apoptotic effects of diffractaic acid in A549 and AGS cancer cells
Klzll, Hamit Emre; Aǧar, Güleray; Akdemir, A.O.; Ekinci, A.; Han, I.; Oztekin, A.; Set, E.; Dadasoglu, F.; Karagoz, K.
In this study, we determined the antiproliferative and apoptotic effects of diffractaic acid by measuring the gene expression changes of topo II α, caspase-3 and p53 on A549 and AGS cancer cells. Real time PCR assay was used to measure the change folds. It was determined that concentrations of 12,5, 50 and 100μg / ml were antiproliferative and apoptotic for the A549 cancer cell line and 50μg / ml for the AGS cell line.
AtıfScopus2WoS1OpenAlex2İncele - Kitap BölümüYalnız künye2017Analysis of structures by total potential optimization using meta-heuristic algorithms (TPO/MA)
Toklu, Y.C.; Toklu, N.E.
Use of meta-heuristic algorithms in analysis of structures is much more recent than their use in design of structures. Effectively, while design optimization makes use of genetic algorithms, simulated annealing, swarm optimization, etc. since about half a century with an increasing interest, these techniques are being used in structural analysis since a decade only. Total Potential Optimization using Meta-heuristic Algorithms (TPO/MA), though being an emerging method at the moment, has proved to be very efficient in solving nonlinear problems, involving both material and geometric nonlinearities. The capabilities of the method in treating under-constrained problems and problems with non-unique solutions are much more advanced than the classical methods including the well-known Finite Element Method.
- MakaleYalnız künye2017Scopus SJRQ2Morphological, Biochemical and Antioxidant Properties of Local Loquat (Eriobotrya Japonica (Thunb.) Lindl.) Germplasm from Turkey; [Morphologische, biochemische und antioxidative Eigenschaften des Zuchtmaterials der Japanischen Wollmispel (Eriobotrya Japonica (Thunb.) Lindl.) aus der Türkei]
Akbulut, Mustafa; Gozlekci, Sadiye; Ercisli, Sezai; Cakir, Ozlem
Loquat (Eriobotrya japonica L.) grown well for commercial purposes in subtropical regions nearly 30 countries and originated from China. The most important loquat producers in the world are China, Spain, Turkey, Pakistan, India, Italy and Brazil. In this study, ten pre-selected promising loquat genotypes sampled from eastern Black region and analyzed for their important morphological, biochemical and antioxidant characteristics. The standard cultivar ‘Sayda’ is also included in the study. The results indicated differences for all of the morphological, biochemical and antioxidant characteristics among tested genotypes. Fruit mass and fruit flesh percentage of the genotypes ranged from 35.40 g (LOQ-8) to 46.90 g (LOQ-5) and from 79.40 (%) to 86.32 (%) indicating some local genotypes had higher fruit mass and fruit flesh percentage than standard cultivar ‘Sayda’. Total phenolic content was the highest as 263 μg GAE/g in LOQ-7 genotype while the lowest in LOQ-8 genotype (185 μg GAE/g). LOQ-7 genotype had the highest total antioxidant capacity. Local genotypes in general have higher total phenolic, total carotenoid, vitamin C and antioxidant activity than cv. ‘Sayda’.
AtıfScopus3WoS5OpenAlex4İncele - BildiriYalnız künye2017Buildup factors and kerma for Al2O3 and SiO2 in the energy range 0.015-15MeV
Yllmaz, Demet; Allm, Bünyamin; Akkuş, Tuba; Güzeldir, Betül; Akdemir, A.O.; Ekinci, A.; Han, I.; Oztekin, A.; Set, E.; Dadasoglu, F.
The energy absorption buildup factors (EABF) have been calculated for some thermoluminescent dosimetric materials (Al2O3 and SiO2) in the energy region 0.015-15MeV up to the penetration depth of 40 mean free paths (mfp). Also, kerma relative to air has been determined for these materials. It is observed that the energy absorption buildup factors and kerma relative to air depend on the photon energy and chemical content. Also, the energy absorption build up factors are found the highest in intermediate energy whereas the lowest in low- as well as high energies.
AtıfScopus1WoS1OpenAlex1İncele - Proje2016Beyin Hastalıklarının Tanı ve Tedavisinde Yeni Yöntem: İn Vivo Mikrosensör Teknolojisi
Kufrevioglu, Omer Irfan; Taspinar, Numan; Binnetoğlu, Damla; Sengul, Goksin; Togar, Basak; Malkoc, Ismail; Denkbaş, Emir Baki; Ozcan, Halil; Okkay, Ufuk; Nalci, Kemal Alp
Beyin hastalıklarının birçoğunun sinaptik aralıklarda görev yapan nörotransmitterlerin beyindeki bazal seviyelerindeki değişiklikler veya sinaptik aralıktan uzaklaştırılma parametrelerinde gelişen aksaklıklar sonucu oluştuğu düşünülmektedir. Bu proje kapsamında beyin hastalıklarının tanı, tedavi ve izleminde kullanılmak üzere gerekli biyouyumlu sensör, kablosuz nörotransmitter algılama cihazı ve yeni bir yazılım üretilmiştir. Beyin nörotransmitter konsantrasyonlarını algılayabilen biyouyumlu sensörlerimizin fabrikasyonu üç aşamadan oluşmaktadır. Bunlar sırasıyla mikroelektrotların fotolitografik yöntemlerle üretimi, paketlenmesi ve seçici kimyasal bariyerlerle kaplanmasıdır. Üretilen sensörler düşük maliyetli ve biyouyumludur. Uyguladığımız yeni bariyerler selektivite ve sensitivite değerlerini yükseltmiştir. Ürettiğimiz sensörlerden gelen konsantrasyon bilgisine ilişkin akımın işlenmesinde kullanılan cihaz bu proje kapsamında üretilmiştir. Bu cihaz, nA seviyesindeki nörotransmitter konsantrasyonu kaynaklı akımları 107 kat yükseltmektedir. Üretilen cihaz, denekler üzerinde taşınabilmesi için oldukça küçük ve hafif olarak tasarlanmıştır. Bu cihaz, bataryası ile birlikte toplam 11.8 g ağırlığında ve 2.9 cm x 2.4 cm boyutundadır. Geliştirilen cihazdan gelen bilgiler deney ve takip esnasında işlenip hem grafik olarak hem de gerçek zamanlı analiz sonuçları olarak ekrana yansıtılabilmektedir. Labview tabanlı yazılıma bu bilgiler kablosuz haberleşme ünitesi vasıtasıyla iletilmektedir. Ayrıca, filtreleme çalışmaları sayesinde sistemin gürültü performansı iyileştirilmiştir. Geliştirdiğimiz bu sistem, deneysel olarak sıçanlarda oluşturduğumuz Depresyon, Kronik Ağrı, Hepatik Ensefalopati, Epilepsi, Alzheimer hastalığı hayvan modellerinde denenmiş, glutamat ve diğer nörotransmitterlerin ölçümleri in-vivo voltametrik olarak yapılmıştır. Burada değişikliği tespit edilen nörotransmitterlerin cinsine göre ilaçlar seçilmiş ve farklılıklar ortadan kaldırılmaya çalışılmıştır. Çok sayıda ilaç denemeleri yapılmıştır. Başarılı bulunanlara sonuç raporunda yer verilmiştir. Bu sonuçlara göre beyin hastalıklarının birçoğunun nörotransmitter değişimleriyle ilişkili olabileceği gösterilmiştir. Bu nörotransmitterlere yönelik tedavilerin de hastalıkların klinik gidişatında düzelmelere yol açtığı tespit edilmiştir. Bu proje ile beyin hastalıklarının etiyolojilerine yönelik çok sayıda veri sunulmakta hatta tedavilerine ışık tutulabilmektedir. Cihaz, yazılım ve sensör için patent başvurusunda bulunulmuştur. Ayrıca bu proje kapsamında TÜBİTAK desteği belirtilen 1 Doktora, 5 Yüksek Lisans tezi bitirilmiştir. 4 Doktora, 3 yüksek lisans tezi bitme aşamasındadır.
- MakaleYalnız künye2016First-day underpricing anomalies of initial public offerings on the borsa istanbul
Yıldırım, Durmuş; Dursun, Aydoğan
This study examines initial underpricing anomalies of IPO using IPO methods with respect to sectors and types of underwriting commitments on the BIST. This study also investigates whether there is a significant difference within the groups. This study includes 110 firms going to public in the BIST during the sample period of 2004-2014. The present study finds evidence about the existence of the initial underpricing anomalies and even a slight effect also continues in the second day. Additionally, according to initial average abnormal returns, there is no significant difference between sectors, IPO methods and underwriting commitment types.
AtıfTR Dizin12
İncele - MakaleYalnız künye2016EKDZ modelinin farklı bina dağılımları içeren senaryolara uygulanarak eğim kırınımı etkisinin araştırılması
Tabakcıoğlu, Mehmet Barış; Çorapsız, Muhammed Reşit
Bu çalışmada, karasal radyo yayıncılığında kullanılan bazı yayılım modelleri kısaca anlatılacak, daha sonra EKDZ veUKT yayılım modelleri kullanılarak benzetimler yapılacaktır. Bu benzetimler için kullanılacak senaryolar bazıistatistiksel ve geometrik dağılımlar kullanılarak belirlenecektir. Bu dağılımlar üzerinden yapılacak benzetimlersonucunda eğim kırınımı etkisi tartışılacaktır.
AtıfTR Dizin1İncele