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Facile synthesis of extended TPA-quinazolinone derivatives and the nonlinear optical properties
摘要： In this work, four new quinazolinone(QZ)-based compounds containing triphenylamine (TPA) moiety have been synthesized, defined as QZC, QZC-1, QZC-2, QZC-3, for the application of third-order nonlinear optical (NLO) responses. A new design of two-step synthesis has been put forward, the first step is Ullmann reaction with QZ, and the second is connecting QZ and the substituted triphenylamines (TPAs) through a Suzuki cross-coupling reaction to afford the target products. Electrochemical measurement data indicated that the tuning of the HOMO and LUMO energy levels can be easily achieved by introducing and modifying the donor moiety. The NLO properties were evaluated by the Z-scan technique which showed that introduction of a benzene ring as a π bridge could reduce the transmission energy of electrons from a ground state to an excited state, and the added methoxy in TPA moiety could promote the ICT, and improve the third-order NLO properties of molecules. Theoretical calculations matched well with the electrochemical information and NLO information. The results suggest that the materials based on QZ have potential applications in integrated NLO devices.
关键词： Fluorescence,photophysical property,Extended Quinazolinone derivative,third-order NLO material,Z-scan technology
更新于2025-11-19 16:46:39
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Determination of Selectivity Coefficients of Sodium and Potassium Ion-Selective Electrode Using Porous Silicon N-Type (100) Based Extended Gate Field Effect Transistor
摘要： Determination of Selectivity Coefficients of Sodium and Potassium Ion-Selective Electrode Using Porous Silicon N-Type (100) Based Extended Gate Field Effect Transistor
关键词： Sodium,Selectivity Coefficients,Porous Silicon,Extended Gate Field Effect Transistor,Ion-Selective Electrode,Potassium
更新于2025-09-23 15:23:52
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Optical Solitons In (2+1)–Dimensions With Kundu–Mukherjee–Naskar Equation By Extended Trial Function Scheme
摘要： This paper addresses Kundu–Mukherjee–Naskar equation by the aid of extended trial function method to recover optical soliton solutions in (2+1)–dimensions. The integration algorithm revealed doubly periodic functions. Upon taking the limiting values of the modulus of ellipticity, bright and singular solitons as well as singular periodic solutions emerge. Additional solutions such as plane waves also fall out of the scheme.
关键词： Kundu–Mukherjee–Naskar equation,extended trial function scheme,solitons
更新于2025-09-23 15:23:52
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Treatment of disorder effects in X-ray absorption spectra beyond the conventional approach
摘要： The contribution of static and thermal disorder is one of the largest challenges for the accurate determination of the atomic structure from the extended X-ray absorption fine structure (EXAFS). Although there are a number of generally accepted approaches to solve this problem, which are widely used in the EXAFS data analysis, they often provide less accurate results when applied to outer coordination shells around the absorbing atom. In this case, the advanced techniques based on the molecular dynamics and reverse Monte Carlo simulations are known to be more appropriate: their strengths and weaknesses are reviewed here.
关键词： Reverse Monte Carlo,Extended X-ray absorption fine structure (EXAFS),Molecular dynamics,Static and thermal disorder,X-ray absorption spectroscopy
更新于2025-09-23 15:23:52
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Modulation stability analysis and solitary wave solutions of nonlinear higher-order Schr?dinger dynamical equation with second-order spatiotemporal dispersion
摘要： In optical fibers, the higher-order nonlinear Schr?dinger (NLS) dynamical equation which describes the beyond the classic slowly varying envelopes and spatiotemporal dispersion of pulses is investigated. By applying the proposed modified extended mapping method, the optical soliton solutions of higher-order NLS dynamical equation with the coefficients of group velocity dispersion, second-order spatiotemporal dispersion and cubic nonlinearity are deduced. The obtained solutions have important applications in applied sciences and engineering. The formation conditions are specified on parameters in which optical solitons can exist for this media. The moments of some constructed solutions are presented graphically which facilitate the researchers to comprehend the physical phenomena of this equation. The modulation instability analysis is utilized to discuss the model stability, which verifies that all obtained solutions are stable and exact. Other such forms of the system arising in sciences and engineering can also be solved by this steadfast, influential and effective method.
关键词： Solitary wave solutions,Higher-order nonlinear Schr?dinger equation,Solitons,Modified extended mapping method
更新于2025-09-23 15:23:52
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Rational Electron Transmission Structure in an Ag <sub/>2</sub> O/TiO <sub/>2</sub> (anatase-B) System for Effective Enhancement of Visible Light Photocatalytic Activity
摘要： Efficient optical flow estimation with high accuracy is a challenging problem in computer vision. In this paper, we present a simple but efficient segmentation-based PatchMatch framework to address this issue. Specifically, it firstly generates sparse seeds without losing important motion information by oversegmentation, and then yields sparse matches by adopting a coarse-to-fine PatchMatch with sparse seeds. Such a scheme enhances the robustness of global regularization and yields better matching results compared with the existing NNF techniques while leading to a significant speed-up due to the sparsity of these seeds. Simultaneously, we introduce an extended nonlocal propagation and adaptive random search to address the basic limitation of traditional coarse-to-fine framework in handing motion details that often vanish at coarser levels. Finally, we obtain dense matches at the finest level through an efficient sparse-to-dense matching according to the cues of oversegmentation. While performing an efficient approximation for oversegmentation, the proposed algorithm runs significantly fast and are robust to large displacements while preserving important motion details. It also achieves good performance on the challenging MPI-Sintel and Kitti flow 2015 datasets.
关键词： extended nonlocal propagation,adaptive random search,Optical flow,PatchMatch,oversegmentation
更新于2025-09-23 15:23:52
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Selected aspects of graphene exfoliation as an introductory step towards 3D structuring of graphene nano-sheets
摘要： The paper reviews the advantages of the synthesis of porous three-dimensional (3D) graphene obtained by various exfoliation methods, with a focus on their recent progress and remaining challenges. The manufacturing procedure influences some crucial properties of obtained carbon materials, such as pore structure and the chemical composition of the surface.
关键词： extended surface,graphene,exfoliation,hard template method,3D structuring,porosity
更新于2025-09-23 15:22:29
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Improvement of the Beam-Wave Interaction Efficiency Based on the Coupling-Slot Configuration in an Extended Interaction Oscillator
摘要： A method aimed at improving the beam-wave interaction efficiency by changing the coupling slot configuration has been proposed in the study of extended interaction oscillators (EIOs). The dispersion characteristics, coupling coefficient and interaction impedance of the high-frequency structure based on different types of coupling slots have been investigated. Four types of coupled cavity structures with different layouts of the coupling slots have been compared to improve the beam-wave interaction efficiency, so as to analyze the beam-wave interaction and practical applications. In order to determine the improvement of the coupling slot to a coupled cavity circuit in an EIO, we designed four nine-gap EIOs based on the coupled cavity structure with different coupling slot configurations. With different operating frequencies and voltages takes into consideration, beam voltages from 27 to 33 kV have been simulated to achieve the best beam-wave interaction efficiency so that the EIOs are able to work in the 2π mode. The influence of the Rb and the ds on the output power is also taken into consideration. The Rb is the radius of the electron beam, and the ds is the width of the coupling slot. The simulation results indicate that a single-slot-type EIO has the best beam-wave interaction efficiency. Its maximum output power is 2.8 kW and the efficiency is 18% when the operating voltage is 31 kV and electric current is 0.5 A. The output powers of these four EIOs that were designed for comparison are not less than 1.7 kW. The improved coupling-slot configurations enables the extended interaction oscillator to meet the different engineering requirements better.
关键词： Output power,Coupling slot configuration,Extended interaction oscillator,Beam-wave interaction efficiency
更新于2025-09-23 15:22:29
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Enhanced nonlinear optical properties of porphyrin with an extended π-conjugated bridge
摘要： In this work, a series of molecules with an extended π-conjugated bridge have been theoretically designed based on porphyrin, where -(CH=CH)n- (n = 1–4, 8, 12) chain is served as an extended π-conjugated bridge. It is found that all molecules exhibit large energy gaps in the range of 3.484–4.151 eV for porphyrin-(CH=CH)n-NH2, and 3.624–4.250 for porphyrin-(CH=CH)n-NO2. The maximum absorption wavelengths of all molecules show a red shift trend with increasing -(CH=CH)n- length, which leads to small transition energy. It is observed that long chain brings these molecules the large first hyperpolarizability, which are 1.04 × 105 au for porphyrin-(CH=CH)12-NH2, 1.26×105 au for porphyrin-(CH=CH)12-NO2. Moreover, compared with -(CH=CH)n-NH2 with the same chain length, -(CH=CH)n-NO2 chain can achieve larger nonlinear optical response. It is hoped that the research in this paper can provide a new strategy for the experimental design of nonlinear optical materials.
关键词： First hyperpolarizability,Porphyrin,An extended π-conjugated bridge
更新于2025-09-23 15:22:29
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Bandwidth-limited orbital angular momentum mode of Bessel Gaussian beams in the moderate to strong non-Kolmogorov turbulence
摘要： We investigate the effects of the moderate to strong fluctuation on the propagation of orbital angular momentum (OAM) modes carried by Bessel Gaussian beams in turbulent atmosphere. The analytic expression of the received probability of the signal and crosstalk OAM mode is derived based on the theories of extended Rytov and non-Kolmogorov turbulence. Our results show that turbulence with smaller non-Kolmogorov index, smaller inner-scale factor is more easily to induce OAM crosstalk between modes. With the increase of turbulence strength, the OAM spreads from adjacent modes to peripheral modes. Our results also indicate that the received signal intensity can be improved by use of Bessel Gaussian beams with small initial radii of beam, low OAM quantum number and long wavelength.
关键词： Bandwidth-limited mode,Non-Kolmogorov turbulence,Extended Rytov theory,Bessel Gaussian beam,Orbital angular momentum
更新于2025-09-23 15:22:29