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151.
152.
Kazuaki Kudo Takuya Yoshizawa Takashi Hamada Jun Li Seiji Sakamoto Shinsaku Shiraishi 《Macromolecular rapid communications》2006,27(17):1430-1436
Summary: Four constitutionally isomeric copoly(amide acid)s (coPAAs), two alternating and two random, have been successfully obtained from the same combination of one non‐symmetrical alicyclic tetracarboxylic dianhydride (1.0 molar equivalents) and two symmetric aromatic diamines (0.5 molar equivalents each) by only slightly changing the reaction procedures. When the reaction mixture is subjected to chemical imidization conditions without isolation of coPAAs, the corresponding copolyimides (coPIs) are obtained in one pot. All of the coPIs are slightly yellow amorphous powders and the solubility of them is similar to each other. The glass transition temperatures of the alternating coPIs are lower in comparison to those of the random coPIs.
153.
Umezawa N Tsuneyuki S Ohno T Shiraishi K Chikyow T 《The Journal of chemical physics》2005,122(22):224101
We suggest a practical solution to dealing with the three-body interactions in the transcorrelated variational Monte Carlo method (TC-VMC). In the TC-VMC method, which was suggested in our previous paper [N. Umezawa and S. Tsuneyuki, J. Chem. Phys. 119, 10015 (2003)], the Jastrow-Slater-type wave function is efficiently optimized through a self-consistent procedure by minimizing the variance of the local energy. The three-body terms in the transcorrelated self-consistent-field equation, which have been simply ignored in our previous works, are efficiently calculated by the Monte Carlo numerical integration. We found that our treatment for the three-body interactions is successful for atoms from Li to Ne. 相似文献
154.
Akishi Kato Yas-Hiro Quano Jun'ichi Shiraishi 《Communications in Mathematical Physics》1993,157(1):119-137
A bosonization scheme of theq-vertex operators of Uq(sl2) for arbitrary level is obtained. They act as intertwiners among the highest weight modules constructed in a bosonic Fock space. An integral formula is proposed forN-point functions and explicit calculation for two-point function is presented.Partly supported by the Grant-in-Aid for Scientific Research from the Ministry of Education, Science and Culture (No. 04245206)A Fellow of the Japan Society of the Promotion of Science for Japanese Junior Scientists. Partly supported by the Grant-in-Aid for Scientific Research from the Ministry of Education, Science and Culture (No. 04-2297) 相似文献
155.
Mori K Ishibashi Y Matsuda H Ito S Nagasawa Y Nakagawa H Uchida K Yokojima S Nakamura S Irie M Miyasaka H 《Journal of the American Chemical Society》2011,133(8):2621-2625
One-color control of colorization/decolorization reactions of diarylethene molecules was attained by using nonresonant high-order multiphoton absorption processes with a near-infrared (NIR) femtosecond laser pulse at 1.28 μm with 35 fs full width at half-maximum (fwhm). The intensity of a rather weak laser pulse (<1 nJ/pulse) can induce the simultaneous three-photon absorption leading to the colorization, while much weaker intensity induces two-photon absorption resulting in the decolorization. The spatial patterning concomitant with higher-order multiphoton absorption processes was also demonstrated. 相似文献
156.
Koizumi H Shiraishi Y Tojo S Fujitsuka M Majima T Hirai T 《Journal of the American Chemical Society》2006,128(27):8751-8753
A polymeric photosensitizer, poly(NIPAM-co-BP), consisting of N-isopropylacrylamide (NIPAM) and benzophenone (BP) units, demonstrates a temperature-controlled oxygenation activity in water. The system promotes a heat-induced oxygenation enhancement at <17 degrees C and suppression at >22 degrees C. This unprecedented photo-oxygenation activity is triggered by a heat-induced phase transition of the polymer from coil to micelle, and then to globule state, cleverly controlling the stability and diffusion of singlet oxygen and the location of substrate. 相似文献
157.
A triethylenetetramine bearing anthracene and benzophenone as a fluorescent molecular logic gate with either-or switchable dual logic functions 总被引:1,自引:0,他引:1
Nishimura G Ishizumi K Shiraishi Y Hirai T 《The journal of physical chemistry. B》2006,110(43):21596-21602
Fluorescence behaviors of a triethylenetetramine bearing anthracene (AN) and benzophenone (BP) fragments at the respective ends, L1, have been studied in water, where effects of pH (H+) and metal cations on the emission properties have been studied in detail. L1 behaves as a fluorescent molecular logic gate driven by H+ (Input1) and metal cations (Input2) as input chemicals. The most notable feature of L1 is that this molecule expresses the "either-or" switchable dual logic functions. Operation of L1 with Cu2+ as Input2 expresses the INHIBIT logic function, where a strong AN fluorescence appears only at pH 4 (with H+) without Cu2+ [Input1(1)-Input2(0)]. In contrast, operations of L1 with all other metal cations as Input2 express the TRANSFER logic function, where the presence of H+ allows strong AN fluorescence regardless of whether the metal cation exists or not [Input1(1)-Input2(0); Input1(1)-Input2(1)]. These emission switching behaviors of L1 are driven by the difference in the coordination stability between L1 and metal cations and the photoinduced intramolecular electron and energy transfer processes: (i) a pH-induced electron transfer from unprotonated nitrogen atoms of the polyamine chain to the photoexcited AN [ELT(N-->AN*)]; (ii) a pH- and metal coordination-induced electron transfer from the photoexcited AN to the ground-state BP [ELT(AN*-->BP)]; and (iii) a Cu2+ coordination-induced energy transfer from the photoexcited AN to Cu2+ [ENT(AN*-->Cu2+)]. 相似文献
158.
Takuya Maki Nahomi Kan Koichiro Kobayashi Kiyoshi Shiraishi 《General Relativity and Gravitation》2012,44(10):2421-2432
We study compactification of extra dimensions in a theory of Dirac–Born–Infeld type gravity. We investigate the solution for Minkowski spacetime with an S 2 extra space as well as that for de Sitter spacetime (S 4) with an S 2 extra space. They are derived by the effective potential method in the presence of the magnetic flux on the extra sphere. We also consider the higher-dimensional generalization of the solutions. We find that, in a certain model, the radius of the extra space has a minimum value independent of the higher-dimensional Newton constant. 相似文献
159.
N. Kan K. Sakamoto K. Shiraishi 《The European Physical Journal C - Particles and Fields》2003,28(3):425-430
We calculate the effective potential for the WLPNGB in a world with a circular latticized extra dimension. The mass of the
Wilson line pseudo-Nambu-Goldstone boson (WLPNGB) is calculated from the one-loop quantum effect of scalar fields at zero
and finite temperature. We show that a series expansion by the modified Bessel functions is useful to calculate the one-loop
effective potentials.
Received: 24 January 2003 / Published online: 14 April 2003
RID="a"
ID="a" e-mail: b1834@sty.cc.yamaguchi-u.ac.jp
RID="b"
ID="b" e-mail: b1795@sty.cc.yamaguchi-u.ac.jp
RID="c"
ID="c" e-mail: shiraish@po.cc.yamaguchi-u.ac.jp 相似文献