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Y. H. Matsuda,T. Nakamura,K. Kuga,S. Nakatsuji,S. Michimura,T. Inami,N. Kawamura,M. Mizumaki 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The valence state of Yb ions in β-YbAlB4 and its polymorph α-YbAlB4 has been investigated byusing X-ray absorption and emission spectroscopy in SPring-8 at temperatures from 2 to 280 K. Theobserved Yb valence is 2.78 ± 0.01 in β-YbAlB4 at 2 K by using the X-ray emission spectroscopy. The valence is found to gradually increase with increasing temperature toward the trivalent state,and the characteristic temperature of the valence fluctuation is expected to be about 290 K. Wealso found a small increase in the Yb valence ( 0.002) by applying a magnetic field of 32 T at40 K to β-YbAlB4.
Phase Diagram and Transport Properties of Y1−xNdxCo2 Pseudo-binary Alloys
A. T. Burkov,M. Takeda,A. Teruya,S. Watanabe,Y. Hiranaka,A. Nakamura,M. Hedo,T. Nakama,K. Yagasaki,Y. Takaesu,K. Uchima,Y. Uwatoko 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The electrical resistivity and the thermopower S of pseudo-binary Y1−xNdxCo2 alloys have beenmeasured at temperatures from 2 to 300 K under pressures up to 3.5 GPa. NdCo2 is a ferromagnetwith a Curie temperature TC of 98 K. In the ferromagnetic phase, it undergoes a 4f spin-reorientationtransition at TR = 40 K. At this transition, the easy direction of 4f magnetization is changed from[100] at temperatures above TR to [110] below TR. The system phase diagram TC(x, P) and TR(x, P)is inferred from the temperature dependencies of the electrical resistivity and the thermopower. The Curie temperature of the alloys, TC decreases with decreasing Nd concentration x and vanishesaround xc = 0.3. Above xc, the Curie temperature decreases with increasing pressure. The spinreorientationtemperature weakly depends on the composition and on the pressure until it mergeswith TC. There is a large region of the phase diagram, partly overlapping with the ferromagneticphase, where the cobalt 3d electron system is non-uniformly magnetized due to spatial fluctuationsof the 4f-3d exchange field related to a random distribution of Nd 4f magnetic moments over the Rsublattice. In this region, large static 3d magnetic fluctuations govern the electronic transport.
徐熙敦,魚秀海,高野亮一,李榮泰,中村哲郞 경북대학교 센서기술연구소 1994 센서技術學術大會論文集 Vol.5 No.1
Three kinds of pressure sensors, which diaphragm size are 0.8Xo.8mm^(2), 0.8X1.2mm^(2) and 0.8X2.4mm^(2) respectively, have been fabricated. In order to obtain optimum gauge according to results of FEM simulation about distribution of shear stress. Three strain gauge with different locations are made on a rectangular diaphragm. The sensitivities of gauges made at the edge of the longer axis(y axis) in 0.8X1.2mm^(2) and 0.8X2.4mm^(2)diaphragm size, are 10.4mV/V·kgf/cm^(2) and 11.1mV/V·kgf/cm^(2) respectively. These are above twice the sensitivities of gauges that is located at the center of the same diaphragms.
Magneto-transport Properties of Fe Thin Films in an External Electric Field
K. Nakamura,T. Akiyama,T. Ito,M. Weinert,A. J. Freeman 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
Magneto-transport properties in Fe thin films in an external electric field (E-field) were investigatedby means of the first-principles full-potential linearized augmented plane-wave method. Results for an Fe monolayer predict a reduction (enhancement) in the in-plane dc electric (intrinsicHall) conductivity due to a change in the band structure around the Fermi energy when the E-fieldis introduced. In addition, a magnetization reorientation from the out-of-plane direction to thein-plane direction leads to an abrupt change in the conductivity. Modification of the ac electricconductivity by an E-field is also presented.
Boolean Approach to Dichotomic Quantum Measurement Theories
K. Nagata,T. Nakamura,J. Batle,S. Abdalla,A. Farouk 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.70 No.3
Recently, a new measurement theory based on truth values was proposed by Nagata and Nakamura [Int. J. Theor. Phys. 55, 3616 (2016)], that is, a theory where the results of measurements are either 0 or 1. The standard measurement theory accepts a hidden variable model for a single Pauli observable. Hence, we can introduce a classical probability space for the measurement theory in this particular case. Additionally, we discuss in the present contribution the fact that projective measurement theories (the results of which are either +1 or −1) imply the Bell, Kochen, and Specker (BKS) paradox for a single Pauli observable. To justify our assertion, we present the BKS theorem in almost all the two-dimensional states by using a projective measurement theory. As an example, we present the BKS theorem in two-dimensions with white noise. Our discussion provides new insight into the quantum measurement problem by using this measurement theory based on the truth values.
Nakamura, M.,Choi, K.H.,Choi, S.K.,Do, C.S.,Jun, J.H.,Kwon, H.K.,Lee, S.M.,Moon, R.J.,Yi, K.J.,Jang, I.S. North-Holland ; Elsevier Science Ltd 2010 european journal of pharmacology Vol.635 No.1
Neurons within the periaqueductal gray (PAG) have been implicated in the central regulation of pain signals by affecting the descending inhibitory pathway. Here we report on the functional role of presynaptic kainate receptors within the PAG. Using a conventional whole-cell patch clamp technique, we recorded GABAergic spontaneous miniature inhibitory postsynaptic currents (mIPSCs) from mechanically isolated rat PAG neurons in the presence of 300nM tetrodotoxin and 20@?M dl-2-amino-5-phosphonovaleric acid under voltage-clamp conditions. Kainic acid at a 10@?M concentration significantly increased the frequency of GABAergic mIPSCs without affecting their amplitude, suggesting that kainic acid acts presynaptically to enhance spontaneous GABA release. The kainic acid-induced increase in mIPSC frequency was completely blocked by CNQX, a selective AMPA/kainate receptor antagonist. While neither AMPA nor NMDA affected GABAergic mIPSC frequency, ATPA, a selective agonist of GluR5-containing kainate receptors, increased GABAergic mIPSC frequency in a concentration-dependent manner. The kainic acid-induced increase in mIPSC frequency was completely suppressed either in the presence of 100@?M Cd<SUP>2+</SUP>, a general voltage-dependent Ca<SUP>2+</SUP> channel (VDCC) blocker, or in the Na<SUP>+</SUP>-free external solution. These results suggest that presynaptic kainate receptors have a low permeability to Ca<SUP>2+</SUP>, and that their activation elicits a presynaptic depolarization large enough to activate presynaptic VDCCs. Presynaptic kainate receptors on GABAergic nerve terminals appear to modulate GABAergic transmission, and in doing so may play an important role in the regulation of PAG neuron excitability.