Subnormality and mild normality in products of ordinal numbers

Thesis (Ph. D. in Science)--University of Tsukuba, (A), no. 3375, 2004.3.25Includes bibliographical reference

Can We Extract Lambda-Lambda Interaction from Two-Particle Momentum Correlation ?

We analyze the invariant mass spectrum of Lambda-Lambda in $^{12}C(K^-,K^+ Lambda Lambda)$ reaction at P(K^+)=1.65 GeV/c by using a combined framework of IntraNuclear Cascade (INC) model and the correlation function technique. The observed enhancement at low-invariant masses can be well reproduced with attractive Lambda-Lambda interactions with the scattering length either in the range a = -6 \sim -4 fm (no bound state) or a = 7 \sim 12 fm (with bound state). We also discuss Lambda-Lambda correlation functions in central relativistic heavy-ion collisions as a possible way to eliminate this discrete ambiguity.Comment: 4 Pages, LaTeX with psfig, embedded 4 ps figures. Talk given at KEK-Tanashi Int. Symp. on "Physics of Hadrons and Nuclei", 14-17 Dec. 1998, Tokyo, Japan, Nuclear Physics A, to appea

Vibrio splendidus biovar II as the causative agent of bacillary necrosis of Japanese oyster Crassostrea gigas.

Recurrent outbreaks of a disease leading to mass mortalities in an oyster (Crassostrea gigas) hatchery located in western Japan were investigated. The disease occurred regularly in 2- to 8-d-old larvae and has been experimentally controlled in the hatchery by treating the larval rearing water with streptomycin, without ascertaining the etiological agent. The signs of the disease and the course of infection resembled bacillary necrosis reported in oysters and other bivalve molluscs in the USA and Europe. Quantitative and qualitative examinations of the bacterial flora of hatchery samples including source water, broodstock, larval feed and larvae revealed a very high total bacterial load and presumptive vibrios in diseased larvae. Further, the bacterial profile revealed that Vibrio spp. constituted approximately 60 to 95% of the bacteria isolated from infected larvae and most isolates were identified as V. splendidus biovar II and V. harveyi, suggesting their possible role in the disease. However, experimental challenges proved the pathogenicity of V. splendidus II. Several isolates of V. splendidus II from infected larvae were highly pathogenic, producing 100% mortality at levels of 105 cfu ml-1 in 24 h, while isolates from other sources demonstrated a low degree of virulence. Detection of V. splendidus II from broodstock, especially in the gonad of a few breeders, suggests the probability that broodstock could be the source and route of transmission of this pathogen

Electroencephalographic changes during piano playing and related mental tasks.

Theta activity in EEG was found to be augmented in the frontal midline area in 5 young women while they played classical piano pieces and during related mental tasks. This activity was considered to be a frontal midline theta rhythm with the maximal amplitude mostly in Fz and of the frequency ranging from 5 to 7.5 Hz. This theta activity was observed to increase depending on the degree of the subjects' concentration on piano playing or related tasks. In bilateral parietal derivations, increases in the power value of alpha activity were observed in some subjects while they were listening to music, suggesting that alpha activity was involved in appreciation of music.</p

Sideward Peak of Intermediate Mass Fragments in High Energy Proton Induced Reactions

Intermediate mass fragment (IMF) formation in the 12 GeV proton induced reaction on Au target is analyzed by using a combined framework of a transport model (JAM/MF) and a newly developed non-equilibrium percolation (NEP) model. In this model, we can well reproduce the mass distribution of fragments. In addition, the sideward peaked angular distribution would emerge under the condition that the fragment formation time is very short, around 20 fm/c. Within this short time period, the un-heated part of the residual nucleus is kept to have doughnut shape, then the Coulomb repulsion from this shape strengthens the sideward peak of IMF.Comment: 22 pages, Latex, 6 embedded PS figure