Convergence of a preconditioned iterative method for H-matrices

AbstractIn this paper, we consider a preconditioned iterative method for solving the linear system Ax = b, which is a generalization of a method proposed in Kotakemori et al. [3] and prove its convergence for the case when A is an H-matrix

Short Rib-Polydactyly Syndrome (Majewski Type): Report of a Case with Autopsy Findings

An autopsy case of short rib-polydactyly syndrome, type II (Majewski type) complicated by anisosplenia is reported, and some discussion has been made from the fetopathological viewpoint on the charactaristic findings and concomitant malformations of this syndrome with regard to a total of 23 cases, including our case and 22 cases reported in literature.Presented at the 24th Annual Meeting of the Congenital Anomalies Research Association of Japan July 6-7, 1984

A System for Nutritional Consulting Using Quick Questionnaires on Diet and Unidentified Complaints

The aging of society and ongoing health care cost-control policy set the trend for the self-medication which leads to the growing interest in health promotion and prolongation of healthy life expectancy through self-health management. We developed a self-medication support system to provide comprehensive support to consumers at pharmacies and drug stores. This system facilitates the effective use of information and knowledge based on medicine and health. This self-medication support system comprised a set of two terminals connected network server in the data center: a user terminal for consumers use and an advisor terminals for specialized advisor, pharmacists, registered dieticians, and etc. This system enables specialized sales people to provide the appropriate advice based on the factors of consumer’s problem, and to make suggestions for improving his/her lifestyle: eating habit, doing exercise, and having relaxation time. As a result of the trial use of this system at pharmacy stores, a certain degree of correlation between the results of a questionnaire on unidentified complaints and dietary patterns causing potential micronutrient deficiency was demonstrated

Effects of Temperature and Mobile Phase Condition on Chiral Recognition of Poly(l-phenylalanine) Chiral Stationary Phase

Characteristics of the chiral stationary phase with poly(l-phenylalanine) peptide selector, which was in α-helical state, was reported. Since environmental factors affect peptide conformation, the changes in enantioselectivity were examined depending on column temperature and mobile phase conditions (ionic strength, pH, mobile phase composition). Column temperature and pH drastically affected the enantioselectivity. Based on these changes, the relation between chiral recognition and secondary structure of the peptide selector was discussed. The column stability during sequential analysis under different separation conditions was also evaluated

A pristine record of outer Solar System materials from asteroid Ryugu’s returned sample

Volatile and organic-rich C-type asteroids may have been one of the main sources of Earth’s water. Our best insight into their chemistry is currently provided by carbonaceous chondritic meteorites, but the meteorite record is biased: only the strongest types survive atmospheric entry and are then modified by interaction with the terrestrial environment. Here we present the results of a detailed bulk and microanalytical study of pristine Ryugu particles, brought to Earth by the Hayabusa2 spacecraft. Ryugu particles display a close compositional match with the chemically unfractionated, but aqueously altered, CI (Ivuna-type) chondrites, which are widely used as a proxy for the bulk Solar System composition. The sample shows an intricate spatial relationship between aliphatic-rich organics and phyllosilicates and indicates maximum temperatures of ~30 °C during aqueous alteration. We find that heavy hydrogen and nitrogen abundances are consistent with an outer Solar System origin. Ryugu particles are the most uncontaminated and unfractionated extraterrestrial materials studied so far, and provide the best available match to the bulk Solar System composition

A dehydrated space-weathered skin cloaking the hydrated interior of Ryugu

Without a protective atmosphere, space-exposed surfaces of airless Solar System bodies gradually experience an alteration in composition, structure and optical properties through a collective process called space weathering. The return of samples from near-Earth asteroid (162173) Ryugu by Hayabusa2 provides the first opportunity for laboratory study of space-weathering signatures on the most abundant type of inner solar system body: a C-type asteroid, composed of materials largely unchanged since the formation of the Solar System. Weathered Ryugu grains show areas of surface amorphization and partial melting of phyllosilicates, in which reduction from Fe3+ to Fe2+ and dehydration developed. Space weathering probably contributed to dehydration by dehydroxylation of Ryugu surface phyllosilicates that had already lost interlayer water molecules and to weakening of the 2.7 µm hydroxyl (–OH) band in reflectance spectra. For C-type asteroids in general, this indicates that a weak 2.7 µm band can signify space-weathering-induced surface dehydration, rather than bulk volatile loss