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- Chakhalian, Jacques, et al.
(author)
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Impurity effects in quasi-one-dimensional S=1/2 antiferromagnetic chain KCuF3 studied by muon spin rotation
- 2004
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In: Journal of Magnetism and Magnetic Materials. - : Elsevier BV. - 0304-8853. ; 272-276:Part 2, s. 979-980
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Journal article (peer-reviewed)abstract
- The local magnetic susceptibility wloc around a positive muon in quasi-one-dimensional spin 1/2 antiferromagnetic chain compounds dichlorobis KCuF3 has been investigated using muon spin rotation/relaxation muSR: We compare chi_loc with the bulk magnetic susceptibility chi measured in a SQUID magnetometer. In all cases there is a dramatic difference between chi_loc and chi; as predicted by theory.
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| 2. |
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| 3. |
- Hirohashi, Junji, et al.
(author)
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Embryonic nucleation method for fabrication of uniform periodically poled structures in potassium niobate for wavelength conversion devices
- 2004
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In: Japanese journal of applied physics. - 0021-4922. ; 43:2, s. 559-566
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Journal article (peer-reviewed)abstract
- A new electric poling concept called the 'embryonic nucleation method' for the fabrication of periodically poled structures has been proposed. By applying this method to KNbO3, 1-mm-thick uniform periodically poled KNbO3 (PPKN) with domain inverted period of 35.5 mum and an interaction length of 10 mm has been successfully fabricated by applying only 300 V/mm without the generation of unwanted domains. Furthermore, the reproducibility of the periodic poling process has been greatly improved. SHG using PPKN fabricated by this method was demonstrated and 100 mW second-harmonic laser generation at a wavelength of 532 nm was obtained from 1 W pumping without photorefractive damage at approximately 40 degrees C.
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| 4. |
- Hirohashi, Junji, et al.
(author)
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Total refraction of p-polarized light at the 90-degree domain boundary in the ferroelectric crystal
- 2004
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In: Japanese Journal of Applied Physics. - 0021-4922 .- 1347-4065. ; 43:6A, s. 3413-3418
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Journal article (peer-reviewed)abstract
- A 90.DEG.-domain structure was fabricated using electrical poling in ferroelectric birefringent KNbO3 crystal. The refraction and reflection characteristics of the light at the boundary of the 90.DEG.-domain structure were investigated, and the novel behavior of total refraction (no reflection) has been found for the P-polarized light throughout the entire range of incident angle (0.LEQ..THETA..LEQ.90.DEG.). Strong refraction of the light was observed after it exited from the crystal output surface at the incidence parallel to the domain boundary. These behaviors were explained analytically. (author abst.)
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| 7. |
- Yoshihara, S., et al.
(author)
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Long-lasting smooth-muscle relaxation by a novel PACAP analogue in human bronchi
- 2004
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In: Regul Pept. ; 123:1-3
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Journal article (peer-reviewed)abstract
- We compared the relaxant effect of original pituitary adenylate cyclase-activating peptide (PACAP)1-27 with that of a newly developed, synthetic PACAP1-27 analogue, [Arg(15,20,21) Leu(17)]-PACAP-Gly-Lys-Arg-NH(2), in human bronchi in vitro (n=4-5 in each group). Using precontraction by carbachol (0.1 muM), cumulative administration of PACAP1-27 and salbutamol caused concentration-dependent smooth muscle relaxation with similar potencies and maximum relaxant effects. Non-cumulative administration of the PACAP1-27 analogue and the original PACAP1-27 caused concentration-dependent relaxation with a similar maximum relaxant effect and potency as well. However, the onset and offset of action was markedly slower for the PACAP1-27 analogue than for the original PACAP1-27 (>90% versus <10% of peak relaxation remaining 5 h after administration). Peptidase inhibition by captopril (10 muM) and phosphoramidon (1 muM) significantly increased the maximum relaxant effect and duration of action of PACAP1-27 but not of the PACAP1-27 analogue, during the 3 h of observation in the human bronchi. We conclude that [Arg(15,20,21) Leu(17)]-PACAP-Gly-Lys-Arg-NH(2) produces significant concentration-dependent and sustained bronchial smooth muscle relaxation in vitro. The sustained relaxant effect is due, at least in part, to the synthetic PACAP1-27 analogue being less susceptible to cleavage by peptidases than the original peptide PACAP1-27.
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