Ground State of a Spin System with Two- and Four-spin Exchange Interactions on the Triangular Lattice

We study a spin system with both two- and four-spin exchange interactions on the triangular lattice as a possible model for the nuclear magnetism of solid $^3$He layers adsorbed on grafoil. The ground state is analyzed by the use of the mean-field approximation. It is shown that the four-sublattice state is favored by introduction of the four-spin exchange interaction. A possible phase transition at a finite temperature into a phase with the scalar chirality is predicted. Application of a magnetic field is shown to cause a variety of phase transitions.Comment: 5 pages, Revte

The Stairways to Heaven: A Model of Career Choice in Sports and Games, with an Application to Chess

We model individual careers in sports and games from initial entry to eventual exit or success as a discrete - choice, finite - horizon optimization problem. We apply this model to the international game of chess and study cross - country differences in the relative success of players. While we find no evidence that the players in our sample from the ex-Warsaw Pact are more talented than European and American players, there is evidence that they face lower training costs.occupational choice, sports and games

How do high school graduates in Japan compete for regular, full time jobs? An empirical analysis based upon an internet survey of the youth

We use a survey of the Japanese youth within 10 year after high school graduation to investiage the impacts of the academic and social skills on their success in the job market. We find three major factors account for the job market outcome immediately after school: school characteristics and job placement services, academic performance, and social skills, including the negative impacts of problematic behaviors at the school. Second, when we run a Probit regression on whether or not the surveyed individuals hold regular, full time job, we find the persistent but declining (over age) im- pact of the job placement immediately after school. Moreover, we find the impact of variables pertaining to the sociall skills remain significant even after controling for the job placement outcome after school, whereas other variables such as GPA or attributes of highschools are largely irrelevant to the current employment status.

Spin nematic order in multiple-spin exchange models on the triangular lattice

We figure out that the ground state of a multiple-spin exchange model applicable to thin films of solid 3He possesses an octahedral spin nematic order. In the presence of magnetic field, it is deformed into an antiferro-quadrupolar order in the perpendicular spin plane, in which lattice Z3 rotational symmetry is also broken. Furthermore, this system shows a narrow magnetization plateau at half, m/m_{sat}=1/2, which resembles recent magnetization measurement [H. Nema et al., Phys. Rev. Lett. 102, 075301 (2009)].Comment: 5 pages, 6 figure

Mismeasurement of the CPI

In this paper, we investigate several key problems in Japanese economic statistics. We use CPI mismeasurements and biases as an example to explore the roots of the problems and also to offer guidelines for improvements. We emphasize 3 major shortcomings shared by many official statistics in Japan: (1) long delays in adjustments, (2) lack of proper coordination, and 3) insufficient information disclosure. In the analysis of CPI bias, we limit our focus to potential biases due to aggregation, survey methodology and sample selection procedures. We estimate that, in recent years, the commodity CPI inflation rate is biased upward by at least 0.5% per year, even if we assume away the potential bias associated with the quality adjustment, delay in incorporating changes in consumption basket, and other important unresolved problems.

Are the More Educated Receiving More Training? Evidence from Thailand

This paper investigates the relationship between education and training provided by the firm, both on the job and off the job, using a unique dataset based on a survey of Thai employees conducted in the summer of 2001. We find a significant and negative relationship between educational attainment and on the job training and no significant relationship between education and off the job training. We also find that education and training are technical complements, especially in the case of off the job training. These findings are consistent with more educated individuals having higher marginal costs of training than less educated workers, especially when on the job training is concerned. Either the better educated have lower learning skills in jobs requiring on the job training or they have higher opportunity costs of training, or both