1,235 research outputs found
Information Aggregation Under Strategic Delay
No full textIn this paper, we show that consumers delay their buying to learn the unknown quality of a product. Agents receive imperfect but informative signals about the unknown quality. Then, each one simultaneously decides whether or not to buy the product in one of the two periods. Consumers with moderate tastes will strategically delay their buying to the second period even though they receive a good signal. They deduce the true quality by observing the mass of first period buyers. We avoid equilibrium non-existence problem by using agents with different private values.Intertemporal price discrimination
Theoretical Investigation of N-Methyl-N '-(4-nitrobenzylidene) pyrazine-2-carbohydrazide: Conformational Study, NBO Analysis, Molecular Structure and NMR Spectra
No full textThe crystal structure determination of the methylated pyrazine-2-carbohydrazide derivative, namely N-methyl-N'-(4-nitrobenzylidene)pyrazine-2-carbohydrazide were optimized to obtain its molecular geometric structure and electronic structures at the Hartree-Fock and density functional theory levels (B3LYP) with 6-311G(d,p) and 6-311++G(d,p) basis sets, using Gaussian 09W programme. The H-1 and C-13 nuclear magnetic resonance chemical shifts of the title molecule were calculated by using the gauge independent atomic orbital, continuous set of gauge transformations and individual gauges for atoms in molecules methods and were also compared with experimental values. The electronic properties high occupied and low unoccupied molecular orbitals energies were calculated and analyzed. Potential energy surface scan, natural population analysis and Mulliken atomic charges were investigated using theoretical calculations. A detailed molecular picture and intermolecular interactions arising from hyperconjugative interactions and charge delocalization of the molecule were analyzed using natural bond orbital analysis
Application of 4-VP-g-PET fibers and its N-oxide derivative as an adsorbent for removal of cationic dye
No full textGunay, Kubra/0000-0002-3522-873XPoly(ethylene terephthalate) fibers (PET) were grafted with 4-vinyl pyridine (4-VP) by a chemical grafting technique, and an N-oxide derivative was synthesized (N-oxide-4-VP-g-PET). The removal of methylene blue (MB) from the aqueous solutions by this material was investigated. The removal and desorption capacities for MB dye were studied under various conditions.4-VP-g-PET fibers exhibited a very low removal rate when compared to the basic dye; however, N-oxide-4-VP-g-PET fibers showed more increased removal results. 2.5% of the MB dyes removal was observed with 4-VP-g-PET fibers, while 100% of MB dyes removal was found with N-oxide-4-VP-g-PET fibers using 10ppm of MB solution. Removal capacity of N-oxide-4-VP-g-PET fibers increased with increasing pH values. The maximum removal capacity of MB dye on the N-oxide-4-VP-g-PET fibers was found to be 35.1mgg(-1) at 250ppm. Results showed that removal capacity of 4-VP-g-PET fibers was significantly improved by N-oxide functionalization. Almost all adsorbed dyes were eluted by acetic acid in methyl alcohol. Ten removal-desorption cycles indicated that the reactive fibers were favorable for use again without the notable change in removal capacity. The information gained from these studies showed that the N-oxide-4-VP-g-PET fibers demonstrated potential as an effective adsorbent for the extremely effective removal of cationic dyes from aqueous media
Droplet evaporation dynamics on surfaces
No full textDroplet evaporation governs many man-made and natural processes. Hence, it has been widely studied by many scientists over the past century. With the recent advancements in nanotechnology, many surfaces for two phase heat transfer have been developed including hydrophobic, biphilic and lubricantinfused surfaces. However, evaporation of droplets on these surfaces have not been explored in depth. Traditionally, evaporation on surfaces was characterized by observing the temporal size changes of a droplet. Yet, the transient nature coupled with the significant mass transfer governed gas dynamics occurring at the droplet three-phase contact line make the classical method crude. To accurately investigate evaporation dynamics on surfaces, we present a novel steady measurement technique. By utilizing a piezoelectric dispenser to feed microscale droplets (20 ≤ ≤ 400 μm) to a larger evaporating droplet at a prescribed frequency, we can create variable-sized droplets on any surface and study their evaporation rates by modulating the droplet addition frequency. Using our steady method, we studied evaporation of water and low surface tension fluids on surfaces including functional, biphilic, biconductive and lubricant-infused surfaces. We elucidated the physics governing the droplet evaporation process for each studied surface and working fluid. Furthermore, we developed an original high-speed focal-shift imaging technique to study droplet mobility on the interface. Our results not only shed light into the evaporation physics of droplets on different surfaces but also provides new avenues and strong experimental platforms for the study of phase change heat transfer processes that enable the decoupling of the intricate and length-scale dependent balance played by internal and external flows and binary-mixture dynamics, and the visualization of the interfacial dynamics.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2021-05-01The student, Ahmet Gunay, accepted the attached license on 2019-04-12 at 18:06.The student, Ahmet Gunay, submitted this Dissertation for approval on 2019-04-12 at 18:10.This Dissertation was approved for publication on 2019-04-15 at 13:19.DSpace SAF Submission Ingestion Package generated from Vireo submission #13602 on 2019-08-22 at 16:21:14Made available in DSpace on 2019-08-23T20:47:22Z (GMT). No. of bitstreams: 2
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Synthesis, spectroscopic characterization and DFT calculations on N-(Phenylsulfonyl)-L-asparagine (NPLAS): A potential nonlinear optical material
No full textThe N-(Phenylsulfonyl)-L-asparagine (NPLAS), which is a potential nonlinear optical material, was synthesized and its geometric structure was optimized to obtain its geometric parameters, vibration frequencies and electronic structures at Hartree-Fock (HF) and B3LYP level of density functional theory (DFT) with 6-311 + +G(d,p) basis set, using Gaussian 09W program. The H-1 and C-13 nuclear magnetic resonance (NMR) chemical shifts of the title molecule were calculated by using the gauge independent atomic orbital (GIAO), continuous set of gauge transformations (CSGT) and individual gauges for atoms in molecules (IGAIM) methods and were also compared with experimental values. The electronic properties HOMO and LUMO energies were calculated and analyzed. Potential energy surface scan, natural population analysis (NPA) and Mulliken's atomic charges were also investigated using DFT and HF models. A detailed molecular picture and intermolecular interactions arising from hyperconjugative interactions and charge delocalization of the molecule were analyzed using natural bond orbital (NBO) analysis. (C) 2016 Elsevier GmbH. All rights reserved
Plasma disposition, haircoat depletion and anthelmintic efficacy of eprinomectin following pour-on administration in donkeys.
No full textObjective-To investigate plasma disposition, concentration in the hair, and anthelmintic efficacy of eprinomectin after topical administration in donkeys. Animals-12 donkeys naturally infected with strongyle nematodes. Procedures-The pour-on formulation of eprinomectin approved for use in cattle was administered topically to donkeys at a dosage of 0.5 mg/kg. Heparinized blood samples and hair samples were collected at various times between 1 hour and 40 days after administration. Samples were analyzed via high-performance liquid chromatography with fluorescence detection. Fecal strongyle egg counts were performed by use of a modified McMaster technique before and at weekly intervals for 8 weeks after treatment. Results-Plasma concentration and systemic availability of eprinomectin were relatively higher in donkeys, compared with values reported for other animal species. Concerning the anthelmintic efficacy against strongyle nematodes, eprinomectin was completely effective (100%) on days 7 and 14 and highly effective (> 99%) until the end of the study at 56 days after treatment. No abnormal clinical signs or adverse reactions were observed for any donkeys after treatment. Conclusions and Clinical Relevance-Eprinomectin had excellent safety. The relatively high plasma concentration after topical administration could result in use of eprinomectin for the control and treatment of parasitic diseases in donkeys
Plasma disposition, concentration in the hair, and anthelmintic efficacy of eprinomectin after topical administration in donkeys
No full textObjective-To investigate plasma disposition, concentration in the hair, and anthelmintic efficacy of eprinomectin after topical administration in donkeys. Animals-12 donkeys naturally infected with strongyle nematodes. Procedures-The pour-on formulation of eprinomectin approved for use in cattle was administered topically to donkeys at a dosage of 0.5 mg/kg. Heparinized blood samples and hair samples were collected at various times between 1 hour and 40 days after administration. Samples were analyzed via high-performance liquid chromatography with fluorescence detection. Fecal strongyle egg counts were performed by use of a modified McMaster technique before and at weekly intervals for 8 weeks after treatment. Results-Plasma concentration and systemic availability of eprinomectin were relatively higher in donkeys, compared with values reported for other animal species. Concerning the anthelmintic efficacy against strongyle nematodes, eprinomectin was completely effective (100%) on days 7 and 14 and highly effective (> 99%) until the end of the study at 56 days after treatment. No abnormal clinical signs or adverse reactions were observed for any donkeys after treatment. Conclusions and Clinical Relevance-Eprinomectin had excellent safety. The relatively high plasma concentration after topical administration could result in use of eprinomectin for the control and treatment of parasitic diseases in donkeys
Ongoing activity of invasive aedes species in Northern Anatolia: lack of Chikungunya despite West Nile virus circulation
No full textGunay, Filiz/0000-0002-2583-6264...
Modeling, fabrication and optimization of optically transparent - thermally insulating silica aerogels for solar thermal applications
No full textSolar thermal energy conversion has the potential to reduce greenhouse gas emissions via the offset of fossil fuel burning power generation methods. By capturing the suns energy and using it to heat steam as part of a Rankine cycle, electrical energy can be renewably produced. Furthermore, solar thermal collectors have high potential for domestic heating when deployed at the rooftop scale, reducing fossil fuel consumption used for home heating needs. The efficiency of these solar applications is highly dependent on the ability of the collecting device to absorb the incoming solar energy, and minimize thermal losses to the environment. Current techniques utilize vacuum tubes to eliminate convective losses, in combination with selective surfaces (high absorptivity in the solar spectrum, and low emissivity in the infra-red (IR)) to minimize thermal re-radiation. Here, we present an alternate approach that operates at atmospheric pressures with simple, black, absorbing surfaces. An Optically Transparent Thermally Insulating (OTTI) layer was assumed to be coated on the back side of the black, broadband absorber. This absorber was assumed to have perfect transparency and opacity in the solar spectrum and Infra-Red (IR), respectively. In order to provide a deeper understanding of the link between the optimum OTTI layer material properties and the overall solar thermal efficiency, we developed a coupled radiative-conduction heat transfer (HT) model used to predict how the investigated OTTI layers will behave when they are used as solar thermal absorbers. The optimum properties that were obtain were then incorporated into the HT model to study the thermal performance under various optical concentrations (1 – 20 suns), solar thermal absorber temperatures (20 – 200°C), and external heat transfer coefficients (10 – 100 W/m2K). The results showed potential solar thermal conversion efficiencies of ≈90% can be attained by utilizing OTTI layers as insulators in the solar thermal absorbers. To check if a material to have the assumed material properties can be fabricated, silica aerogels were procured, synthesized and characterized. Due to their naturally high and low transmissivities in the solar and IR spectrums, respectively, silica based aerogels coated on the back with highly absorbing (black) surfaces offer a potential solution to create simple and inexpensive solar thermal absorbers. To test our hypothesis, we fabricated tetramethyl orthosilicate (TMOS) and tetraethyl orthosilicate (TEOS) based silica aerogels. The formed gels were aged for 3 weeks and dried using a carbon dioxide supercritical point dryer. The obtained aerogel optical properties were characterized using ultraviolet-visible (UV-Vis) and Fourier Transform Infrared (FTIR) spectroscopy, showing spectrally averaged (0 < λ < 2.7 µm) transmissions of ≈87% for a sample thickness of 4mm. To minimize the effect the O-H group transmission reduction occurring in the solar spectrum, we modified the baseline aerogels to be hydrophobic with a silane treatment to shield the exposed hydroxyl groups on the surface. Hydrophobic modification resulted in an increase of the spectrally averaged transmissions to ≈ 94%. This study sheds light on the applicability of silica aerogels on black coatings as ideal solar thermal absorbers and offers insights into new avenues for performance improvement of solar thermal energy systems.Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2018-05-01The student, Ahmet Gunay, accepted the attached license on 2016-04-25 at 15:18.The student, Ahmet Gunay, submitted this Thesis for approval on 2016-04-25 at 15:31.This Thesis was approved for publication on 2016-04-27 at 09:14.DSpace SAF Submission Ingestion Package generated from Vireo submission #9484 on 2016-07-07 at 13:50:50Made available in DSpace on 2016-07-07T20:28:01Z (GMT). No. of bitstreams: 3
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Shaping Modern Suburban Britain: Two American Designers in Devon during the Early 1930s
No full textIn GULERSOY N. Z., AYATAC H., ONEM A., KORAMAZ K., GUNAY Z., ARSLANLI K., AYRANCI I. (editors)
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