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141.
Ossipyan Yu. A. Morgunov R. B. Baskakov A. A. Orlov A. M. Skvortsov A. A. Inkina E. N. Tanimoto Y. 《JETP Letters》2004,79(3):126-130
JETP Letters - A microwave magnetic field crossed with a static field was found to exert a resonance effect on the dislocation mobility in single crystals of p-type silicon. The frequency of... 相似文献
142.
Saito N Nanjyo J Taneda Y Shiokawa Y Tanimoto M 《Rapid communications in mass spectrometry : RCM》2007,21(16):2654-2662
We report a new type of mass spectrometry based on a time-of-flight mass spectrometer combined with an ion attachment ionization technique (IA-TOF). In contrast to electron ionization mass spectra, IA-TOF mass spectra are not complicated by peaks due to fragmentation of the molecular ion; the adduct ion formed in IA does not fragment. We developed a tabletop IA-TOF system and evaluated its performance by analyzing specimens originally in the gas, liquid, and solid phases. We obtained fragment-free spectra covering a mass range up to m/z 3400 with a mass resolution of about 4700. Our IA-TOF system realizes accurate and versatile real-time mass spectrometry. 相似文献
143.
Novel gadolinium complexes (KMR-series: KMR-K and KMR-Mg), which have a bis-15-crown-5 ether or a charged beta-diketone structure as a recognition site, have been designed, synthesized and applied for the detection of K(+) or of Mg(2+) and Ca(2+) using MRI or NMR techniques. The measurements are based on the modulation of the longitudinal relaxation time (T(1)) of water protons in proximity of the gadolinium complexes. Relaxivity measurements of KMR-K1 in aqueous solution showed that the initial longitudinal relaxivity value (r(1)) of 5.05 mM(-1) s(-1) is monotonously decreasing with increasing K(+) concentrations, reaching a final value of 4.78 mM(-1) s(-1). This decrease is attributed to a change in the second sphere of hydration of the gadolinium (Gd(3+)) complex (KMR-K), resulting in a K(+) concentration-dependent contrast in MR images. From stoichiometric analysis using mass spectrometry and UV/VIS spectrometry, a 1 : 1 complex formation between KMR-K1 and K(+) in a sandwich-type manner with a log K of 3.20 was confirmed. In the case of KMR-Mg, the initial r(1) value of 4.98 mM(-1) s(-1) is monotonously decreasing with increasing Mg(2+) or Ca(2+) concentrations, reaching a final value of 3.95 or 4.16 mM(-1) s(-1), respectively, resulting in Mg(2+) and Ca(2+) concentration-dependent contrast in MR images. The formation of a 1:1 complex with a log K of 2.33 for Mg(2+) and 1.91 for Ca(2+) was confirmed. KMR-K1 and KMR-Mg are the first ion-selective or ion-sensitive gadolinium complexes for K(+) or Mg(2+) and Ca(2+), respectively. 相似文献
144.
Toshihiko Kondo Mitsutoshi Tanimoto Masakatsu Matsumoto Katsunori Nomoto Yohji Achiba Katsumi Kimura 《Tetrahedron letters》1980,21(17):1649-1652
Experimental COOC dihedral angles are used to support the relation proposed by Coughlin et al. for correlating the observed photoelectron splitting n(O)+- with the dihedral angle around the peroxide bond in cyclic peroxides. 相似文献
145.
Prapassorn Rugthaworn Yoshinori Murata Masashi Machida Waraporn Apiwatanapiwat Akiko Hirooka Warunee Thanapase Hatairat Dangjarean Satoru Ushiwaka Kozo Morimitsu Akihiko Kosugi Takamitsu Arai Pilanee Vaithanomsat 《Applied biochemistry and biotechnology》2014,173(5):1197-1208
In this study, we report the inhibition of Kluyveromyces marxianus TISTR5925 growth and ethanol fermentation in the presence of furan derivatives and weak acids (acetic acid and lactic acid) at high temperatures. Cassava pulp, obtained as the waste from starch processing, was collected from 14 starch factories located in several provinces of Thailand. At a high temperature (42 °C), the cassava pulp hydrolysate from some starch factories strongly inhibited growth and ethanol production of both K. marxianus (strain TISTR5925) and Saccharomyces cerevisiae (strain K3). HPLC detected high levels of lactic acid and acetic acid in the hydrolysates, suggesting that these weak acids impaired the growth of K. marxianus at high temperature. We isolated Trp-requiring mutants that had reduced tolerance to acetic acid compared to the wild-type. This sensitivity to acetic acid was suppressed by supplementation of the medium with tryptophan. 相似文献
146.
Yoh Tanimoto 《Communications in Mathematical Physics》2012,314(2):419-441
In higher dimensional quantum field theory, irreducible representations of the Poincaré group are associated with particles. Their counterpart in two-dimensional massless models are ??waves?? introduced by Buchholz. In this paper we show that waves do not interact in two-dimensional M?bius covariant theories and in- and out-asymptotic fields coincide. We identify the set of the collision states of waves with the subspace generated by the chiral components of the M?bius covariant net from the vacuum. It is also shown that Bisognano-Wichmann property, dilation covariance and asymptotic completeness (with respect to waves) imply M?bius symmetry. Under natural assumptions, we observe that the maps which give asymptotic fields in Poincaré covariant theory are conditional expectations between appropriate algebras. We show that a two-dimensional massless theory is asymptotically complete and noninteracting if and only if it is a chiral M?bius covariant theory. 相似文献
147.
R. B. Morgunov A. I. Dmitriev A. S. Chernen’kaya K. Yakushi K. Yamamoto Y. Tanimoto 《Journal of Experimental and Theoretical Physics》2010,111(5):857-864
Sharp changes in the integral intensity and linewidth of the ESR spectrum that accompany the localization of the charge carriers
have been revealed in α’-(BEDT-TTF)2IBr2 crystals. It has been found that the types of localization in two compounds under investigation are different: charge carriers
in β″-(BEDT-TTF)4NH4[Cr(C2O4)3] are localized on irregular defects of the crystal lattice, whereas charge carriers in α’-(BEDT-TTF)2IBr2 are localized at the regular positions of the unit cell. The exchange narrowing of the ESR line and a sharp decrease in the
dc and ac magnetic susceptibilities are observed in α’-(BEDT-TTF)2IBr2 at low temperatures T < 50 K. The dc and ac magnetic susceptibilities observed in α’-(BEDT-TTF)2IBr2 at high temperatures T > 50 K differ from each other, because the thermally activated hopping frequency of the charge carriers is higher than the
frequency of the measuring UHF field of an ESR spectrometer. 相似文献
148.
We have studied the two-loop effect on the infrared fixed point of the Yukawa couplings. The two-loop contribution to the large Yukawa coupling for the quark is found to be within 4.5% at the electroweak scale, but that for the lepton is up to 8%. It is noticed that the fixed point structure obtained by the one-loop renormalization group equations is credible enough, at least to the two-loop approximation. 相似文献
149.
R. B. Morgunov V. L. Berdinskiĭ M. V. Kirman K. Inoue J. Kishine Y. Yoshida Y. Tanimoto 《JETP Letters》2006,84(8):446-450
Quasiperiodic sequences of the maxima of microwave absorption with decreasing amplitudes have been observed in a temperature range of 4–50 K in the electron spin resonance spectra of ferrimagnetic chiral single crystals [Mn{(R/S)-pn}]2[Mn{(R/S)-pn}2(H2O)][Cr(CN)6]2, as well as [Cr(CN)6][Mn(S)-pnH-(H2O)]H2O. Theoretical estimates and previous experimental data indicate that the Dzyaloshinskii-Moriya interaction is the main factor determining the chirality of the spin density and the existence of soliton solutions for the spin dynamics in these crystals. The experimental dependences obtained for the distances between the microwave power absorption maxima on the constant component of the magnetic field of the spectrometer correspond to the theoretical predictions for spin solitons in three-dimensional magnetic materials and exhibit another behavior in crystals with quasi-two-dimensional magnetic ordering. 相似文献
150.
R. B. Morgunov Y. Tanimoto K. Inoue Y. Yoshida M. V. Kirman 《Russian Journal of Physical Chemistry B, Focus on Physics》2007,1(3):254-258
Ferrimagnetic resonance spectra of the [Mn{(R/S)-pn}]2[Mn{(R/S)-pn}]2(H2O)][Cr(CN)6]2 molecular magnetics were examined. It was established that, within the high-temperature (paramagnetic) region (T > 53 K), the EPR spectrum features a single Lorentz-shaped peak, while, at temperatures below 53 K, in a three-dimensional ferrimagnetic state, this peak splits into several components, some of which correspond to different states of spins in the helical chains of atoms comprising the chiral crystalline structure. 相似文献