Relations between children's imaginary companion status and their engagement in private speech during free play were investigated in a socially diverse sample of 5-year-olds (N=148). Controlling for socioeconomic status, receptive verbal ability, total number of utterances, and duration of observation, there was a main effect of imaginary companion status on type of private speech. Children who...

A Sudoku grid is a constrained Latin square. In this paper a reduced Sudoku grid is described, the properties of which differ, through necessity, from that of a reduced Latin square. The Sudoku symmetry group is presented and applied to determine a mathematical relationship between the number of reduced Sudoku grids and the total number of Sudoku grids for any size. This relationship simplifies...

This study explored how social pressure related to parental preference for the sex of their children affects fertility. Pre-war and post-war generations were compared using individual level data previously collected in Japan in 2002. In the pre-war generation, if the first child was a daughter, the total number of children tended to increase not only when the mother preferred a son, but also wh...

The present study investigated associations between maternal relationship instability patterns and children's behavioral and emotional functioning in middle childhood in a representative sample of low-income urban families (N = 891). Data from the Three-City Study tracked maternal partnerships through the child's life, assessing total marital and cohabiting relationship transitions and delineat...

Analysis of new data on the relationship between and premiums and coverage in the individual insurance market and health risk shows that actual premiums paid for individual insurance are much less than proportional to risk, and risk levels have a small effect on obtaining coverage. States limiting risk rating in individual insurance display lower premiums for high risks than other states, but s...

I examined the relation between courtship and mate choice in convict cichlids by presenting females with the option of courting and spawning with one of two males that were isolated from each other. I quantified the amount of courtship performed by females towards males they selected as mates and males they rejected, and the amount of courtship performed by each male towards the female. I measu...

This study was conducted to explore the effectiveness of participatory training for promoting farmer’s health and reducing agricultural work-related injuries. Candidates for this study included 595 farmers in 8 rural villages of South Korea. The one-day course participatory training was administered to 217 (36.5%) farmers and included an action-checklist, a good example presentation, and group ...

Currently, sticky traps are regularly employed to assist in the surveillance of Aedes aegypti infestation. We tested two alternative procedures for specimen identification performed by local health agents: directly in the field, as recommended by certain manufacturers, or after transportation to the laboratory. A total of 384 sticky traps (MosquiTRAP) were monitored monthly during one year in f...

The scale-specific information content of the infinite-range, ferromagnetic Ising model is examined by means of information-theoretic measures of high-order correlations in finite-sized systems. The order-disorder transition region can be identified through the appearance of collective order in the ferromagnetic phase. In addition, it is found that near the transition, the ferromagnetic phase i...

Abstract. We consider a Jepsen gas of N hard-point particles undergoing free expansion on a line, starting from random initial positions of the particles having random initial velocities. The particles undergo binary elastic collisions upon contact and move freely in-between collisions. After a certain ordering time To, the system reaches a “fan” state where all the velocities are completely or...