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排序方式: 共有130条查询结果,搜索用时 15 毫秒
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K. Nisimura H. Shimizu K. Imai T. Ichihara N. Matsuoka K. Hatanaka H. Sakai T. Saito K. Hosono M. Kondo A. Okihana 《Nuclear Physics A》1985,432(2):378-388
The differential cross section and the vector and tensor analyzing powers Ay, Axx, Ayy and Axz were measured for the d-4He elastic scattering at 56 MeV. The measurement of Axz was performed using a deuteron beam polarized in the horizontal plane. An optical-model analysis of the experimental data was carried out. The magnitude of the tensor analyzing powers could not be reproduced without the tensor potential. By including the TR type tensor potential, the optical-model calculations give a reasonable reproduction of the experimental data at θc.m. < 120°. The obtained TR tensor potential was much stronger than that predicted by the folding model. The strength of the real TR potential was roughly in accordance with that obtained from the optical-model analysis of d-4He elastic scattering at 20.2 MeV. 相似文献
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The crosscap number of a knot in the 3-sphere is defined as the minimal first Betti number of non-orientable surfaces bounded by the knot. In this paper, we determine the crosscap numbers of a large class of pretzel knots. The key ingredient to obtain the result is the algorithm of enumerating all essential surfaces for Montesinos knots developed by Hatcher and Oertel. 相似文献
16.
Ichihara O Sampson D Whittaker M Bradley M Cho JK 《Combinatorial chemistry & high throughput screening》2007,10(4):261-267
Previously, we have reported the development and application of self-indicating resins (SIR), materials which can indicate presence or absence of amines in the reaction solution by the conspicuous color change of a phenolsulfophthalein type dye immobilized on resin beads [2a]. Although the functionality necessary for attaching the dye to the resins could be readily introduced by the Suzuki-Miyaura coupling during the synthesis of the SIR 1, this approach was only applicable to the dyes containing suitable functionality for the cross-coupling reaction. In this article we describe a new approach of immobilizing the indicating dyes onto the resin support. The dyes suitable for loading onto aminomethyl polystyrene (PS) resin were prepared by Friedel-Crafts reaction of 2-sulfoterephthalic anhydride with a wide range of phenols. Using this new route, the SIR 6c was readily prepared in >100g quantities. Use of the SIR 6c in the synthesis of a 144 member urea library was demonstrated and the SIR successfully indicated the endpoint of the reaction between amines and isocyanates. 相似文献
17.
Hajime Nagano Atsushi Torihata Mika Matsushima Ryo Hanai Yoshinori Saito Makiko Baba Yui Tanio Yasuko Okamoto Yuriko Takashima Mayu Ichihara Xun Gong Chiaki Kuroda Motoo Tori 《Helvetica chimica acta》2009,92(10):2071-2081
Root chemicals and evolutionarily neutral DNA regions in L. cyathiceps samples collected in the Zhongdian (Shangrila) County of Yunnan, P. R. China, were examined. Twenty compounds were isolated, including three new ones, 1β,10β‐epoxy‐6β‐(propionyloxy)furanoeremophilan‐9‐one ( 6 ), 1β,10β‐epoxy‐8α‐ethoxyeremophila‐6,11‐diene ( 14 ), and 11αH‐6β‐isobutyryloxy‐1β,10β,7β,8β‐diepoxyeremophilan‐12,8α‐olide ( 15 ). The chemical diversity was found to be limited, with cacalol ( 1 ) and 6‐(acyloxy)furanoeremophilan‐9‐ones ( 4 and/or 5 ) being major components in all the samples. The nuclear ribosomal RNA gene was also found to harbor little variation, although two distinct sequence types were found for the plastid atpB‐rbcL intergenic region. 相似文献
18.
Cho JK Najman R Dean TW Ichihara O Muller C Bradley M 《Journal of the American Chemical Society》2006,128(19):6276-6277
Polystyrene-poly(ethylene glycol) resin-captured cross-linked palladium nanopaticles were prepared via a straightforward route, and their heterogeneous behavior was truly confirmed by various tests. They were applied to aqueous Suzuki cross-coupling reactions with various aryl bromides and recycled up to six times without loss of activity. 相似文献
19.
K. Hatanaka N. Matsuoka H. Sakai T. Saito K. Hosono Y. Koike M. Kondo K. Imai H. Shimizu T. Ichihara K. Nisimura A. Okihana 《Nuclear Physics A》1984,426(1):77-91
The differential cross section and all components of the analyzing powers Ay, Axx, Ayy and Axz have been measured in dp elastic scattering at 56 MeV. This is the first measurement of Axz in the cyclotron energy region. Axz has been measured with the beam polarized in the horizontal plane using the polarization tagging method. Faddeev calculations have been performed for four cases of the NN interaction. The Coulomb correction gave smaller effects at the present energy than at lower energies. Three of them reproduce the experimental data well. The agreement between the calculations and data for Axz was better than that reported at lower energy. The deuteron asymptotic D- to S-state ratio has been obtained and is consistent within the limits of uncertainty with previously obtained values. 相似文献
20.
Kazuhiro Ichihara Toshio Saito Masakazu Teragaito 《Proceedings of the American Mathematical Society》2007,135(2):605-615
We give a formula for Alexander polynomials of doubly primitive knots. This also gives a practical algorithm to determine the genus of any doubly primitive knot.