排序方式: 共有59条查询结果,搜索用时 15 毫秒
51.
Akay Sertan Kemal Sarsıcı Serhat Kaplan Hüseyin Kaan 《Optical and Quantum Electronics》2018,50(10):1-11
Optical and Quantum Electronics - A single mode condition for silica–titania rib waveguides is proposed in this work. It is applicable to rib waveguides having rib height sufficiently small... 相似文献
52.
Mustafa İlhan Mete Kaan Ekmekçi Ayhan Mergen Cemalettin Yaman 《Journal of fluorescence》2016,26(5):1671-1678
Undoped and Eu3+ doped BaTa2O6 phosphors were synthesized via solid state reaction method and characterized by using XRD, SEM-EDS and photoluminescence (PL) analyses. The XRD results revealed that the crystal structure of BaTa2O6 allowed up to 10 mol% levels of Eu3+ ions due to the TTB characteristic network of adjacent octahedrals. SEM-EDS analyses confirmed the formation of BaTa2O6 structure and EuTaO4 secondary phase. BaTa2O6:Eu3+ phosphors exhibited orange and red emissions at 592.2 nm and 615.7 nm in the visible region respectively. The Commission Internationale d’Eclairage (CIE) chromaticity coordinates of the BaTa2O6:Eu3+ phosphors that excited at λ ex = 400 nm ranged from orangish-red to pinkish-red depending on increasing Eu3+ concentration. 相似文献
53.
We show that base-stock levels first increase and then decrease as the standard deviation increases for a variety of non-negative random variables with a given mean and provide a distribution-free upper bound for optimal base-stock levels that grows linearly with the standard deviation and then remains constant. 相似文献
54.
Santiago-Cordoba M Topal Ö Allara DL Kalkan AK Demirel MC 《Langmuir : the ACS journal of surfaces and colloids》2012,28(14):5975-5980
Optically active metal nanoparticles have been of recent and broad interest for applications to biomarker detection because of their ability to enable high sensitivity enhancements in various optical detection techniques. Here, we report stimuli responsive release of metallic nanoparticles on a semiconductor thin film array structure based on pH change. The metallic nanoparticles are obtained by a simple redox procedure on the semiconductor surface. This approach allows controlling nanoparticle surface coatings in situ for biomolecule conjugation, such as DNA probes on nanoparticles, and rapid stimuli responsive release of these nanoparticles upon pH change. 相似文献
55.
Kaan Ozbay Cem Iyigun Melike Baykal-Gursoy Weihua Xiao 《Annals of Operations Research》2013,203(1):389-406
This paper proposes mathematical programming models with probabilistic constraints in order to address incident response and resource allocation problems for the planning of traffic incident management operations. For the incident response planning, we use the concept of quality of service during a potential incident to give the decision-maker the flexibility to determine the optimal policy in response to various possible situations. An integer programming model with probabilistic constraints is also proposed to address the incident response problem with stochastic resource requirements at the sites of incidents. For the resource allocation planning, we introduce a mathematical model to determine the number of service vehicles allocated to each depot to meet the resource requirements of the incidents by taking into account the stochastic nature of the resource requirement and incident occurrence probabilities. A detailed case study for the incident resource allocation problem is included to demonstrate the use of proposed model in a real-world context. The paper concludes with a summary of results and recommendations for future research. 相似文献
56.
Kaja Schubert Meiyuan Guo Kaan Atak Simon Drner Christine Bülow Bernd von Issendorff Stephan Klumpp J. Tobias Lau Piter S. Miedema Thomas Schlathlter Simone Techert Martin Timm Xin Wang Vicente Zamudio-Bayer Lucas Schwob Sadia Bari 《Chemical science》2021,12(11):3966
The local electronic structure of the metal-active site and the deexcitation pathways of metalloporphyrins are crucial for numerous applications but difficult to access by commonly employed techniques. Here, we applied near-edge X-ray absorption mass spectrometry and quantum-mechanical restricted active space calculations to investigate the electronic structure of the metal-active site of the isolated cobalt(iii) protoporphyrin IX cation (CoPPIX+) and its deexcitation pathways upon resonant absorption at the cobalt L-edge. The experiments were carried out in the gas phase, thus allowing for control over the chemical state and molecular environment of the metalloporphyrin. The obtained mass spectra reveal that resonant excitations of CoPPIX+ at the cobalt L3-edge lead predominantly to the formation of the intact radical dication and doubly charged fragments through losses of charged and neutral side chains from the macrocycle. The comparison between experiment and theory shows that CoPPIX+ is in a 3A2g triplet ground state and that competing excitations to metal-centred non-bonding and antibonding σ* molecular orbitals lead to distinct deexcitation pathways.Near-edge X-ray absorption mass spectrometry (NEXAMS) and restricted active space (RAS) quantum mechanical calculations at the metal L-edge reveal the electronic structure and orbital-specific deexcitation pathways of gas-phase metalloporphyrins. 相似文献
57.
Kaan Atak Ozgur O. Aybar Gokhan ?ahin Avadis Hac?nl?yan Yani Skarlatos 《Central European Journal of Physics》2009,7(3):568-574
Polyethylene Glycol has an irregular current characteristic under constant voltage and slowly varying relative humidity. The
current through a thin film of Gamma-isocyanatopropyltriethoxysilane added Polyethylene glycol (PEG-Si), its hydrogenated
and hydrophobically modified forms, as a function of increasing relative humidity at equal time steps is analyzed for chaoticity.
We suggest that the irregular behavior of current through PEG-Si thin films as a function of increasing relative humidity
could best be analyzed for chaoticity using both time series analysis and detrended uctuation analysis; the relative humidity
is kept as a slowly varying parameter. The presence of more then one regime is suggested by the calculation of the maximal
Lyapunov exponents. Furthermore, the maximal Lyapunov exponent in each of the regimes was positive, thus confirming the presence
of low dimensional chaos. DFA also confirms the presence of at least two different regimes, in agreement with the behavior
of the maximal Lyapunov exponent in the time series analysis. We also suggest that the irregular behavior of the current through
PEG-Si can be reduced by hydrogenating and hydrophobically modifying PEG-Si and the improvement in stability can be confirmed
by our study.
相似文献
58.
Latife Sahin Nurgül Hafızoğlu Hakan Çetinkaya Kaan Manisa Engin Bozkurt Ahmet Biçer 《Isotopes in environmental and health studies》2017,53(2):212-221
The analysis of natural radioactivity from 238U, 232Th and 40K in 357 soil samples collected from the province of Kütahya was carried out using a NaI(Tl) gamma-ray spectroscopy system at the Nuclear Physics Research Laboratory, Dumlup?nar University, Kütahya, Turkey. The specific activities of 238U, 232Th and 40K in the soil samples were evaluated. From the activity concentrations of 238U, 232Th and 40K, the total absorbed outdoor gamma-ray dose rates and the corresponding annual effective dose rates were determined. The corresponding values of the external and internal hazard indices of all the soil samples were also calculated. The external gamma-ray dose rate at 1 m above the ground was directly measured at each collected soil sample location. The results obtained in this study were compared within the limits of values obtained in other cities of Turkey, those in other countries. Radiological maps of Kütahya Province were constructed from the results of this study. 相似文献
59.
Sekkal-Haddouche A. F. Inal M. K. Benmouna M. 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2023,77(7):1-7
The European Physical Journal D - In the present work, we describe a new method, dressed cross-section model (DCSM), enabling implementation of large number of atomic transitions (~106 and more) in... 相似文献