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비스므스 바나데이트 단결정의 ^(51)V 원자핵의 스핀-격자 완화시간
염태호 청주대학교 산업과학연구소 2001 産業科學硏究 Vol.18 No.2
Temperature dependences of the spin-lattice relaxation time for (51)^V in a bismuth vanadate single crystal was measured at temperature range of 140 ∼ 400 K. The T_(1S) were divided into long and short component, which may originate from phonon interaction and paramagnetic relaxation, respectively. A turning point was found at about 280 K, near the temperature at which the softening of optical phonon mode occurs.
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스핀 7/2계의 전자 상자성 공명 자기장에 관한 각도의존 시늉내기
염태호 청주대학교 산업과학연구소 1999 産業科學硏究 Vol.17 No.1
Rotation patterns of electron paramagnetic resonance (EPR) fields for paramagnetic ions with electron spin S = 5/2 are simulated with the effective spin Hamiltonian. Their rotation patterns depend on the local site symmetry as well as the value of the EPR parameters. Spectroscopic splitting factor g dependence is also calculated for the simple 1/2 electronic spin system. The orthorhombic spin Hamiltonian is used to simulate rotation pattern in xy-, yz-. and zx-planes, respectively, as a function of g and zero filed splitting parameters. These rotation patterns of resonance spectra with local site symmetry are very useful to analyze the paramagnetic impurity ions in the single crystal by using EPR technique.
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Nuclear Magnetic Relaxation of the 51V Nucleus in a YVO4:Nd Single Crystal
염태호,박성수 한국물리학회 2019 새물리 Vol.69 No.2
Nuclear magnetic resonance data of the 51V nucleus in an YVO4 single crystal doped with Nd are obtained using a Fourier-transform nuclear magnetic resonance (NMR) spectrometer in the temperature range of 180 K 410 K. The spin–lattice relaxation mechanisms are investigated, and the dominant mechanism at temperatures above 280 K is found to be the Raman process because the spin lattice relaxation rate of the 51V nucleus is proportional to the square of the temperature (T 1 1 / T2). However, at temperature below 280 K, the effect of the paramagnetic impurity becomes more significant than that of the quadrupole relaxation. This is verified through an analysis of the activation energy of the paramagnetic Nd3+ impurity.
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Electron Magnetic Resonance Study of Mn-doped Quantum Dot CsPbBr3 Inside a Phosphate Glass Matrix
염태호,염효영,Pabitra Aryal 한국물리학회 2021 새물리 Vol.71 No.10
Mn2+ ion-doped perovskite CsPbBr3 quantum dots embedded in glass were synthesized by using the melt-quenching technique. An X- band electron magnetic resonance (EMR) spectrometry, showed two sets of Mn2+ EMR spectra in the CsPbBr3 quantum dots at room temperature: One originating from isolated Mn2+ ions and the other set from Mn2+ clusters. As the Mn concentration was increased, the concentration of isolated Mn2+ ions decreased, whereas the concentration of Mn2+ clusters increased. The spectroscopic splitting parameter (g = 2.011) and the hyperfine constant (A = 9.66 mT) were determined using the effective spin Hamiltonian. The Mn2+ ion resides at Pb2+ instead of Cs+ in CsPbBr3 QDs and/or in the fabricated CsPbBr3 glass. If the Mn2+ ion substitute for Pb2+ in the CsPbBr3 QDs, the local site symmetry of the Mn2+ ion is cubic.
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유효스핀 S=7/2계의 직방정계 대칭성내에서의 에너지 계산
염태호 청주대학교 2009 産業科學硏究 Vol.27 No.1
The ground state energy calculations of effective spin S=7/2 system in orthorhombic symmetry for paramagnetic ions are calculated using the effective spin Hamiltonian. Their energy levels depend on the local site symmetry of crystals as well as the values of the electron magnetic resonance (EMR) parameters gij and Dij of paramagnetic ions. The energy levels are also calculated as a function of applied magnetic field directions and different EMR parameters. These calculated energy levels of paramagnetic ions are very useful to analyze the paramagnetic impurity ions and get microscopic informations in the single crystals by using electron magnetic resonance technique
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핵 스핀 9/2계에 대한 핵 자기 공명의 각도에 대한 전산시늉
염태호 청주대학교 산업과학연구소 2008 産業科學硏究 Vol.25 No.2
The nuclear quadrupole interactions of the nuclear spin 9/2 system have been investigated by simulation method of nuclear magnetic resonance (NMR) frequencies. The rotation patterns of resonance frequencies were obtained as a function of the nuclear quadrupole coupling constant (e2qQ/h) and asymmetry parameter (η) in the three crystallographic ab-, bc-, and ca-planes. Different g, e2qQ/h and η give different rotation patterns of resonance frequencies of nuclei. The more frequency splittings between the transitions, the larger quadrupole coupling constant obtain. The simulation results are very helpful to analyze the experimental data of nuclear quadrupole resonance (NQR) and NMR of nuclei in the host crystal.
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LiTaO_(3) 단결정 내 Mn^(2+) 이온의 영 자기장 갈라지기
염태호 청주대학교 산업과학연구소 1997 産業科學硏究 Vol.15 No.-
The semi-empirical superposition model (SPM) has been applied to calculate the zero-field splitting (ZFS) parameters of Mn^(2+) ion in a L_(1)TaO_(3) single crystal, assuming that Mn^(2+) ion occupies one of two possible sites: Li^(+) or Ta^(5+) sites The 2nd-order ZFS parameters of MN^(2+) at L_(1)^(+) and Ta^(5+) sites are about 958 × 10^(-4) cm^(-1) and 193 × 10^(-4) cm^(-1), respectively. The 4th-order ZFS parameters at Li^(+) and Nb^(5+) sites are also determined. These ZFS parameters calculated are very important to differentiate the substitutional sites of Mn^(2+) ion in LiTaO_(3) crystal.
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염태호 고려대학교 행동과학연구소 1986 行動科學硏究 Vol.8 No.1
Clinical neuropsychology is just approaching the most exciting and exhilarating period in its development. The future of neuropsychology is considered first in terms of the potential impact of events occurring in clinical medicine, neuroscience research, basic behavioral science and applied psychology, and related disciplines. The focus is then turned inward on clinical neyropsychology itself and a series of suggestions are made concerning how this specialty can evolve to best meet the challenges it will face. We must re-examine our basis premises regarding the nature of neuropsychological testing, understand better the processes by which we make clinical inferences, and design and implement more powerful procedures for conducting neuropsychological research.
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유효전자스핀 S=3/2에 대한 삼사정계 대칭성 내에서의 전자 자기 공명선의 각도의존
염태호 청주대학교 2015 産業科學硏究 Vol.33 No.1
The angular variations of electron paramagnetic resonance fields for paramagnetic impurity ion with electronic spin S = 3/2 are calculated using the triclinic effective spin Hamiltonian. Their angular dependences depend on the local site symmetry of crystals, g-tensor, and zero-field splitting parameters of the electron paramagnetic resonance parameters for doped impurity ions. These angular variations of resonance field are very useful to understand the paramagnetic impurity ions in the crystals and get microscopic informations about the single crystals by using electron paramagnetic resonance technique. They are also useful to know the substitutional sites of impurity ions in the host crystals doped with paramagnetic impurity ions.
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