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1.
Koruyucu Elif Ekici Selcuk Karakoc T. Hikmet 《Journal of Thermal Analysis and Calorimetry》2021,145(3):1303-1315
Journal of Thermal Analysis and Calorimetry - This study presents determining performance parameters as well as thermodynamic analysis through certain design parameters of a two-spool turbojet... 相似文献
2.
Selcuk Denizligil Aysegul Baskan Yusuf Yagci 《Macromolecular rapid communications》1995,16(5):387-391
The polymerization of tetrahydrofuran was initiated with 4,4′-azobis(4-cyanovaleryl chloride) in conjunction with silver hexafluoroantimonate and the living polytetrahydrofuran (PTHF) was terminated with pyridinium N-oxide derivatives. The resulting PTHF-macroinitiator possesses both a thermally and photochemically labile group. 相似文献
3.
Xun?Gu Selcuk?Akturk Aparna?Shreenath Qiang?Cao Rick?TrebinoEmail author 《Optical Review》2004,11(3):141-152
We review the state of the art of ultrashort-light-pulse measurement using frequency-resolved-optical-gating (FROG). Recent developments have extended the state of the art considerably. FROG devices for measuring the intensity and phase of ultrashort laser pulses have become so simple that almost no alignment is required. In addition, such devices not only operate single shot, but they also yield the two most important spatio-temporal distortions, spatial chirp and pulse-front tilt. With other FROG variations, it is now possible to measure more general ultrashort light pulses (i.e., pulses much more complex than common laser pulses), with time-bandwidth products as large as several thousand and as weak as a few hundred photons, and despite other difficulties such as random absolute phase and poor spatial coherence. 相似文献
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In this note we show that various branch and bound methods for solving continuous global optimization problems can be readily adapted to the discrete case. As an illustration, we present an algorithm for minimizing a concave function over the integers contained in a compact polyhedron. Computational experience with this algorithm is reported. 相似文献
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The Ramanujan Journal - We compute Fourier series expansions of weight 2 and weight 4 Eisenstein series at various cusps. Then we use results of these computations to give formulas for the... 相似文献
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Given the NP-Hard nature of many optimization problems, it is often impractical to obtain optimal solutions to large-scale
problems in reasonable computing time. For this reason, heuristic and metaheuristic search approaches are used to obtain good
solutions fast. However, these techniques often struggle to develop a good balance between local and global search. In this
paper we propose a hybrid metaheuristic approach which we call the NeuroGenetic approach to search for good solutions for
these large scale optimization problems by at least partially overcoming this challenge. The proposed NeuroGenetic approach
combines the Augmented Neural Network (AugNN) and the Genetic Algorithm (GA) search approaches by interleaving the two. We
chose these two approaches to hybridize, as they offer complementary advantages and disadvantages; GAs are very good at searching
globally, while AugNNs are more proficient at searching locally. The proposed hybrid strategy capitalizes on the strong points
of each approach while avoiding their shortcomings. In the paper we discuss the issues associated with the feasibility of
hybridizing these two approaches and propose an interleaving algorithm. We also provide empirical evidence demonstrating the
effectiveness of the proposed approach. 相似文献
8.
Huseyin Selcuk Kilic 《Applied Mathematical Modelling》2013,37(14-15):7752-7763
One of the important stages in supply chain management which regards all the activities from the purchasing of raw material to final delivery of the product is the supplier selection process. Since it is the first stage of the supply chain management, it is a critical process affecting the consecutive stages. It is simply desired to select the best supplier for a specific product. But since there are a lot of criteria and alternatives to be considered, numerous decision making models have been proposed to provide a solution to this problem. Within this study, an integrated approach including fuzzy Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) and a mixed integer linear programming model is developed to select the best supplier in a multi-item/multi-supplier environment. The importance value of each supplier with respect to each product is obtained via fuzzy TOPSIS in the first stage. Then in the second stage, these values are used as an input in the mathematical model which determines the suppliers and the quantities of products to be provided from the related suppliers. So as to validate the proposed methodology, an application is performed in air filter sector. 相似文献
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By immersing a conventional glass axicon in index-matching liquid, we generated high quality, tunable, quasi-non-diffracting Bessel beams. The aberrations resulting from the roundness of the axicon tip are minimized when a large base angle is used in liquid-immersion. This configuration also allows coarse and fine tunability through changing the liquid and adjusting the temperature, respectively. Our experimental results match very well with calculated intensity profiles. We succeeded to generate two-meter long plasma channels in air by focusing femtosecond laser pulses with the liquid-immersion axicon. 相似文献
10.
Arif Selcuk Ogrenci Onder Pekcan Selim Kara Ayse Humeyra Bilge 《Journal of Macromolecular Science: Physics》2018,57(5):364-376
The thermal phase transition temperatures of high (HMP) and low melting point (LMP) agarose gels were investigated by using UV–vis spectroscopy techniques. Transmitted light intensities from the gel samples with different agarose concentrations were monitored during the heating (gel-sol) and cooling (sol–gel) processes. It was observed that the transition temperatures, Tm, defined as the location of the maximum of the first derivative of the sigmoidal transition paths obtained from the UV–vis technique, slightly increased by increasing the agarose concentration in both the HMP and LMP samples. Here, we express the phase transitions of the agar-water system, as a representative of reversible physical gels, in terms of a modified Susceptible-Infected-Susceptible epidemic model whose solutions are the well-known 5-point sigmoidal curves. The gel point is hard to determine experimentally and various computational techniques are used for its characterization. Based on previous work, we locate the gel point, T0, of sol-gel and gel-sol transitions in terms of the horizontal shift in the sigmoidal transition curve. For the gel-sol transition (heating), T0 is greater than Tm, i.e. later in time, and the difference between T0 and Tm is reduced as the agarose content increases. For the sol-gel transition (cooling), T0 is again greater than Tm, but it is earlier in time for all agarose contents and moves forward in time and gets closer to Tm as the agarose content increases. 相似文献