检索结果-南通市图书馆

Axial charges of N(1535) and N(1650) in two-flavor lattice QCD

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2009年第12期33卷 1233-1237页

作者： Toru T. Takahashi Teiji Kunihiro Yukawa Institute for Theoretical Physics Kyoto University Kyoto 606-8502 Japan Department of Physics Kyoto University Kyoto 606-8502 Japan

We show the lattice QCD results on the axial charge gAN＊-N＊ of negative parity nucleon resonances, N＊（1535） and N＊（1650）, which are key clues to the chiral structure in baryon sector. The measurements are performed with up and down dynamical quarks employing the renormalization-group improved gauge action at β=1.95 and the O（a） improved clover quark action with the hopping parameters, κ=0.1375, 0.1390 and 0.1400. In order to properly separate signals of N＊（1535） and N＊（1650）, we construct 2 × 2 correlation matrices and diagonalize them. Wraparound contributions in the correlator, which can be another source of signal contaminations, are eliminated by imposing the Dirichlet boundary condition in the temporal direction. We find that the axial charge of N＊（1535） takes small values as gAN＊N＊-O（0.1）, whereas that of N＊（1650） is about 0.5, which is found independent of quark masses and consistent with the predictions by the naive nonrelativistic quark model.

关键词： axial charge chiral symmetry negative parity nucleon

Dual ultracontractivity and its applications

在线全文

学校读者我要写书评

暂无评论

Frontiers of Mathematics in China 2014年第4期9卷 899-928页

作者： Ichiro SHIGEKAWA Department of Mathematics Kyoto University Kyoto 606-8502 Japan

The ultracontractivity is well studied and several equivalent conditions are known. In this paper, we introduce the dual notion of the ultracontractivity, which we call the dual ultracontractivity. We give necessary and sufficient conditions for the dual ultracontractivity. As an application, we discuss one-dimensional diffusion processes. We can write the conditions for the dual ultracontractivity in terms of speed measures.

关键词： Dual ultracontractivity one-dimensional diffusion processes Nashinequality interpolation

Formation of Low Aspect Ratio Torus Equilibria by ECH in the LATE Device

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plasma Science and Technology 2006年第1期8卷 95-98页

作者： Takashi MAEKAWA Hitoshi TANAKA Masaki UCHIDA Tomokazu YOSHINAGA Graduate School of Energy Science Kyoto UniversityKyoto 606-8502Japan

By ECH under a steady By field, a closed field equilibrium of a low aspect ratio as low as R/a = 1.4 is spontaneously formed in the LATE device. After the spontaneous formation, the plasma current has increased further up to Ip = 7.2 kA by 2.45 GHz, 30 kW and Ip = 11 kA by 5 GHz, 120 kW, by increasing the microwave power with a slow ramp of By for the equilibrium of the plasma loop at larger currents. Both amount to 12% of the total toroidai coil current. ECH/ECCD at 2nd harmonic resonance of EBW supports the plasma. An outline of the theoretical considerations for the formation process is presented.

关键词： ECH spherical tokamaks non-inductive start-up

A new N* resonance as a hadronic molecular state

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2009年第12期33卷 1312-1317页

作者： Daisuke Jido Yoshiko Kanada-En’yo Yukawa Institute for Theoretical Physics Kyoto University Kyoto 606-8502 Japan

We report our recent work on a hadronic molecule state of the KKN system with I =1/2 and jR = 1/2＋. We assume that the A（1405） resonance and the scalar mesons, f0（980）, ao（980）, are reproduced as quasi-bound states of KN and KK, respectively. Performing non-relativistic three-body calculations with a variational method for this system, we find a quasibound state of the KIlN system around 1910 MeV below the three-body breakup threshold. This state corresponds to a new baryon resonance of N＊ with JP ： 1/2＋. We find also that this resonance has the cluster structure of the two-body bound states keeping their properties as in the isolated two-particle systems. We also briefly discuss another hadronic molecular state composed by two K and one N, which corresponds to a resonance.

关键词： three-body bound state ∧(1405) resonance kaon-nucleon intera^tion variational calculation

Preharvest long-term exposure to UV-B radiation promotes fruit ripening and modifies stage-specific anthocyanin metabolism in highbush blueberry

在线全文

学校读者我要写书评

暂无评论

Horticulture Research 2021年第1期8卷 1082-1093页

作者： Taishan Li Hisayo Yamane Ryutaro Tao Graduate School of Agriculture Kyoto UniversityKyoto 606-8502Japan

Ultraviolet-B(UV-B)light(280–315 nm)is an important environmental signal that regulates plant development and photomorphogenesis,while also affecting the flavonoid pathway,including anthocyanin *** the effects of UV-B radiation on fruits,the effects of a short-term or postharvest irradiation on fruit quality have been well-documented,but the effects of a long-term preharvest UV-B irradiation on fruit growth and coloration remain ***,in this study,we investigated the effects of a long-term treatment involving an environmentally relevant UV-B dose on highbush blueberry(Vaccinium corymbosum)*** preharvest UV-B treatment quickly promoted fruit growth and sugar accumulation,which is not commonly observed in other fruit tree *** UV-B exposure also accelerated fruit ripening and *** dual-luciferase assay proved that in blueberries,expression of VcUFGT encoding anthocyanin biosynthesis key enzyme,is positively and negatively regulated by VcMYBA1 and VcMYBC2,*** the fruit development stage,the UV-B treatment up-regulated VcMYBPA1 expression,which increased VcUFGT expression via *** the green fruit stage,the UV-B treatment increased HY5 encoding UV receptor,which up-regulates VcMYBPA1 and down-regulates VcMYBC2,thereby promotes the accumulation of *** the other hand,excessive anthocyanin synthesis was inhibited by increased VcMYBC2 levels in mature fruits when exposed to UV-B light through HY5-independent *** conclusion,anthocyanin-related MYB activators and repressor may coordinately balance the accumulation of anthocyanins in blueberry fruits,with UV-B treatments possibly influencing their effects in a stage-specific *** potential utility of preharvest UV-B treatments for improving blueberry fruit quality is discussed herein.

关键词： treatment metabolism specific

Collective Hamiltonian for Multi-O（4） Model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2007年第2期47卷 309-316页

作者： GU Jian-Zhong Masato Kobayasi China Institute of Atomic Energy P.O. Box 275 （18） Beijing 102413 China Department of Physics Graduate School of Science Kyoto University Kyoto 606-8502 Japan Yukawa Institute for Theoretical Physics Kyoto University Kyoto 606-8502 Japan

The collective Bamiltonian up to the fourth order for multi-O（4） model is derived based on the self-consistent collective-coordinate （SCC） method, which is formulated in the framework of the time-dependent Hartree-Bogoliubov （TDHB） theory. The validity of the collective Hamiltonian is checked in the two special cases of the multi-O（4） model： the case where the number of the shells is equal to one （a single j-shell case）, and the case where the Hartree-Bogoliubov equilibrium point is spherical （the spherical case）. The collective Hamiltonian constitutes a good starting point to study nuclear shape coexistence.

关键词： self-consistent collective-coordinate method multi-O(4) model time-dependent Hartree-Bogoliubov theory collective Hamiltonian

Next-generation research on transcriptional regulation of plant immunity

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2024年第11期17卷 1651-1653页

作者： Akira Mine Laboratory of Plant Pathology Graduate School of AgricultureKyoto UniversityKyoto 606-8502Japan

Plant health is fundamental for agricultural production to feed the growing global population as well as for primary production to sustain ecosystem *** innate immune system of plants is integral to their health;it is activated upon recognition of pathogen invasion by immune receptors,leading to pathogen resistance through genome-wide transcriptional *** defense-associated transcriptome reprogramming is mediated by various immune signals,including the phytohormone salicylic acid(SA).SA plays a pivotal role in activating pathogen resistance both locally in infected tissues and systemically in uninfected *** Arabidopsis thaliana,SA is perceived by its receptors NONEXPRESSOR OF PATHOGENESIS-RELATED GENES 1(NPR1),NPR3,and *** NPR3 and NPR4 function as negative regulators of SA signaling,NPR1 serves as a key positive regulator of SA-mediated transcriptomic changes and pathogen resistance(Ding et al.,2018).Consistent with its lack of a DNA-binding domain,NPR1 has been shown to act as a transcription cofactor for multiple transcription factors(TFs)such as TGAs and WRKYs(Wang et al.,2006;Kumar et al.,2022).Besides TFs,other components of the transcriptional machinery are likely to participate in NPR1-regulated transcriptional responses,as NPR1 forms nuclear condensates upon SA induction(Zavaliev et al.,2020).Despite decades of research on NPR1’s functions in plant immunity,a comprehensive understanding of how NPR1 cooperates with multiple TFs and other components of the transcriptional machinery to initiate and propagate transcriptional responses to SA is still lacking.

关键词： transcriptional plant immunity

Study of Electron Orbits for Formation of Toroidal Closed Flux Surface by ECH

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plasma Science and Technology 2011年第3期13卷 342-346页

作者： Tak,ushi MAEKAWA Tomokazu YOSHINAGA Hitoshi TANAKA Masaki UCHIDA Fumitake WATANABE Graduate School of Energy Science Kyoto University Kyoto 606-8502 Japan National Institute for Fusion Science Toki 509-5292 Japan

Electron orbits under the external vertical field （Bv） and the self poloidal field of the toroidal plasma current in a toroidal geometry are investigated by using analytic model fields in order to search for the conditions of occurence of appropriate confinement asymmetry of fast electrons along the field lines. This asymmetry efficiently and quickly generates a toroidal current, which may close the field lines in ECH-started plasmas. It is analytically shown that the characteristics of confinement asymmetry depend on the product of the major radius and the strength of the external vertical field. The results suggest that in large devices By should be lowered and also some artificial means to speed up the pitch angle scattering for the fast electrons at a higher energy range are beneficial to generate the toroidal current in order to close the filed

关键词： ECH closed flux surface electron orbit

Counting Multiplicities in a Hypersurface over Number Fields

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Algebra Colloquium 2018年第3期25卷 437-458页

作者： Hao Wen Chunhui Liu Department of iVlathematicM Sciences Tsinghua University Beijing 100084 China Department of Mathematics Faculty of Science Kyoto University Kyoto 606-8502 Japan

We fix a counting function of multiplicities of algebraic points in a projective hypersurface over a number field, and take the sum over all algebraic points of bounded height and fixed degree. An upper bound for the sum with respect to this counting function will be given in terms of the degree of the hypersurface, the dimension of the singular locus, the upper bounds of height, and the degree of the field of definition.

关键词： algebraic point counting multiplicities height function over projective space intersection tree rational point