Ruttanapun, Chesta
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Preferred name
Ruttanapun, Chesta
Alternative Name
Ruttanapun, C.
Main Affiliation
Email
chesta.ru@kmitl.ac.th
14 results
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Item type:Publication, P-Type optoelectronic and transparent conducting oxide properties of delafossite CuAl1/2Fe1/2O2(2015-12-03); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Reinvestigation thermoelectric properties of CuAlO2(2014-01-01); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, The direct measurement of the photorefractive grating on anisotropic self diffraction using digital holography(2014-09-02); ; Jindajitawat, PhuminIn this paper, the measurement of grating period in photorefractive anisotropic self diffraction by using digital holography technique is proposed. In our experimental setup, He -Ne laser beam with wavelength of 632.8 nm has been separated and then incident on photorefractive cerium doped barium titanate crystal to produce photorefractive index grating. The transmitted probe beam, which contains phase and amplitude has been expanded and recorded on digital camera. To explore the grating periods, both phase and amplitude of the images are reconstructed by numerical process using computer. Then the grating periods in photorefractive anisotropic self diffraction have been measured. The results show grating periods, holograms and their reconstruction. © 2014 Taylor & Francis Group, LLC. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Preparation, characterization and finite element computation of Cu(Al 1/2Fe1/2)O2 Delafossite-oxide themoelectric generator module(2014-09-02); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Optical and electronic transport properties of p-type CuCoO2 transparent conductive oxide(2013-09-18); ; Jindajitawat, PhuminThe CuCoO2 sample has been synthesized by a conventional solid-state reaction method to investigate electronic transport and optical properties for p-type transparent conducting oxide materials. The crystal structure was characterized by XRD. The Seebeck coefficient and electrical conductivity were measured in the high temperature. The UV-VIS-NIR and FTIR spectra were analyzed at room temperature. The XRD peaks confirm the samples forming the delafossite structure phase. The Seebeck coefficient sign confirms the samples displays the p-type conducting. The electronic transport energy for activating free carrier production and conduction contain 0.276 eV and 0.131 eV, respectively. The optical direct gap is 3.65 eV which is a visible-transparent oxide material. These results support that the CuCoO2 oxide compound is p-type transparent conducting oxide materials. © 2013 SPIE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Optical parametric amplification in one-dimensional photonic bandgap structures(2013-09-01); ; Jindajitawat, PhuminIn this paper, optical parametric amplification based on the degenerate four-wave mixing principle in a one-dimensional photonic bandgap (PBG) structure has been numerically studied. First, the multiple scale method was introduced to derive a complete set of nonlinear coupled-mode equations for a finite structure with different inhomogeneous nonlinear coefficients than those used in previous works. This finite structure is composed of 680 dielectric layers, which are alternating half-wave/eight-wave films. The wavelengths of the pump, signal, and idler pulses have been determined from the transmission spectrum, which was illustrated by using the transfer matrix method. The parametric interaction of the pump, signal, and idler pulses inside PBG structure has been numerically simulated by using the splitstep Fourier transform method. The results of the simulation have shown that the intensities of the signal and idler have exponential growth with respect to the number of layers in the medium. Meanwhile, pump wavevector detuning directly affects the intensities of both pulses due to a band-edge phase-matching condition that might be achieved from only one optimal detuning parameter. Moreover, both the amplification gain and the conversion efficiency of the idler pulse have been shown to be dependent on the bandwidth of the pump pulse spectrum. A very narrow pulse, with a bandwidth much less than the relevant transmission peak, enables the highest amplification and conversion efficiency in this medium because the most efficient phase-matched condition occurs in this situation. Finally, the conversion efficiency grows exponentially with input pump intensity for several input signal intensities. Furthermore, the maximum conversion efficiencies directly vary with input signal intensity. © 2013 Optical Society of America. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Enhancing the supercapacitor performance of NiCo2O4 microflowers by reduced graphene oxide nano-sheets(2021-01-28); ; This work presented the preparation and supercapacitor performance of a spinel nickel-cobalt oxide (NiCo2O4) microflowers mixed with nano-sized reduced graphene oxide (rGO) sheets. The hybrid material (NiCo2O4/rGO), pure NiCo2O4 and nano-sized rGO samples were characterized and confirmed by several techniques, such as XRD, SEM and EDS. The supercapacitive properties of all prepared samples were also studied using an electrochemical measurement technique (CV and GCD). The results revealed that the NiCo2O4/rGO (484.1 F.g<sup>-1</sup>) hybrid electrode exhibited much higher specific capacitance than those of pristine NiCo2O4 (358.3 F.g<sup>-1</sup>) and nano-sized rGO (113.8 F.g<sup>-1</sup>) electrodes, respectively. Hence, this work indicates that the supercapacitor performance of NiCo2O4 mixed rGO hybrid materials is more superior to the pure NiCo2O4 microflowers and nano-sized rGO sheets. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, The electrochemical measurements investigation of NiCo2O4for electrode materials of energy storage devices by using digital holography technique(2021-01-01); The electrochemical properties of NiCo2O4for using as electrode materials for the potential applications have been investigated by electrochemical measurement which composed of cyclic voltammetry (CV) and galvanostatic chargedischarge (GCD). These processes are generating the ion exchange between the electrode and electrolyte, wherein induce the surface change of the interface. Especially, since in the cycle ability measurement using the potentiostat needed to repeat the cycle into the electrode for many times, the effective of the electrode is reduced. In this research, digital holographic technique was used to investigate the different properties of interface of the NiCo2O4 electrode while operating under the various electrochemical techniques. In our DH recording, the surface change of the electrode was expose at the difference potential scan rate at 1, 5, 10, 50, 100 and 200 mV/s of CV, and the difference current densities at 1, 2, 3, 5, 10 and 20 A/g of GCD and vary times of cycle ability test every 50 cycle times to 1000 cycles. In the end the reconstructed DH images of the electrode have been used to analyze the results from electrochemical measurement. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Proof of using fourier coefficients for root mean square calculations on periodic signals(2013-01-01); ; ; The purpose of this work is to academically prove using Fourier coefficients of periodic signals for root mean square (RMS) calculations. In the detail, properties of Fourier series are brought to calculate RMS values of periodic signals obviously. Results from this work can confirm that this method is more convenient, efficient and simple for RMS calculations than Calculus integration technique (if Fourier coefficients are given) and can be cited for further researches. © 2014 Sompop Poomjan et al. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, High temperature thermoelectric properties of delafossite CuBO2(2014-01-01); ;