Modelling quasicrystals at positive temperature

We consider a two-dimensional lattice model of equilibrium statistical mechanics, using nearest neighbor interactions based on the matching conditions for an aperiodic set of 16 Wang tiles. This model has uncountably many ground state configurations, all of which are nonperiodic. The question addressed in this paper is whether nonperiodicity persists at low but positive temperature. We present arguments, mostly numerical, that this is indeed the case. In particular, we define an appropriate order parameter, prove that it is identically zero at high temperatures, and show by Monte Carlo simulation that it is nonzero at low temperatures

Variações da temperatura do ar e do solo sob a influência de filmes plásticos de diferentes cores na produção do morangueiro.

bitstream/item/79847/1/comunicado-260.pd

Zoneamento agroclimático para oliveira no estado do Rio Grande do Sul.

bitstream/CPACT-2010/12255/1/documento-259.pd

ENVIRONMENTAL MODULATION AND STATISTICAL EQUILIBRIUM IN MIND-MATTER INTERACTION

Mind-matter interactions observed in laboratory experiments typically manifest as minute statistical flucruations from chance expectation. Meta-analyses suggest that these small flucruations reflect genuine, direct interactions between mind and matter, but lack of predictability of the effect has made systematic study of the phenomenon difficult. Two general factors that may contribute to erratic laboratory outcomes are (a) unavoidable environmental fluctuations and (b) a physical principle that tends to counterbalance mind-matter effecrs in time and space. Environment is used in the holistic sense, including cosmic, global, local, and personal variables. The physical principle is envisioned as a tendency for perturbations introduced into a system to be statistically balanced by opposing perturbations so as to maintain an overall condition of equilibrium. A longitudinal experiment with the experimenter as subject was designed to explore the possible influences of these twO factors in mind-matter interaction. The results found strong indicators of environmental modulation, including a successful demonstration that a neural network could learn to predict mind-matter interaction performance based upon eight environmental variables. Evidence for a time-and space-like equilibrium principle was also observed in the data

POSSIBLE INFLUENCE OF THE GEOMAGNETIC FIELD ON SPORTS PERFORMANCE

If human behavior and performance are affected by minute changes in the earth's geomagnetic field, as suggested by a growing body of evidence, then one might also expect to see such influences reflected in skilled physical performance, such as sports. To explore this possibility, scores from a mixed-gender, candlepin competitive bowling league were correlated with daily planetary geomagnetic flux. Results indicated that geomagnetic fluctuations the day before bowling accounted for a significant percentage (40%) of the variance in men's bowling scores. The same relationship was not independently significant for women's scores, but the correlation was opposite to men's scores

TOWARDS A COMPLEX SYSTEMS MODEL OF PSI PERFORMANCE

If psi is like any other human abiliry, and widely disrribured in rhe popularion, rhan psi performance may be modulated by many of the same facrors that affect other forms of human performance. To test rhis notion, 105 people participated in a series of four psi tests. Participants represented a broad range of age, belief. experience and personality type; data of 96 participants was adequate for further analysis. A rotal of 149 variables were tracked per participant, including psi performance, psychological, sociological, meteorological, and solar-geophysical facrors. The first test relied upon background ionizing radiation as the physical target, the second and third tests used electronic noise, and the fourth test involved a riming task. A single score was used to summarize each individual's psi performance in the four tests. An artificial neural network was trained on the data of 72 participants to see if psi performance could be predicted based on eight variables representing an aggregation of 24 environmental, sociological and psychological factors. The network successfully learned to predict the performance of the remaining 24 people (correlation between prediction and actual performance was r 0.47, p ; 0.01), suggesting that psi performance in the laboratory, and probably in life, is influenced by some of the same environmental factors that influence other forms of human behavior

ENVIRONMENTAL MODULATION AND STATISTICAL EQUILIBRIUM IN MIND-MATTER INTERACTION

Mind-matter interactions observed in laboratory experiments typically manifest as minute statistical flucruations from chance expectation. Meta-analyses suggest that these small flucruations reflect genuine, direct interactions between mind and matter, but lack of predictability of the effect has made systematic study of the phenomenon difficult. Two general factors that may contribute to erratic laboratory outcomes are (a) unavoidable environmental fluctuations and (b) a physical principle that tends to counterbalance mind-matter effecrs in time and space. Environment is used in the holistic sense, including cosmic, global, local, and personal variables. The physical principle is envisioned as a tendency for perturbations introduced into a system to be statistically balanced by opposing perturbations so as to maintain an overall condition of equilibrium. A longitudinal experiment with the experimenter as subject was designed to explore the possible influences of these twO factors in mind-matter interaction. The results found strong indicators of environmental modulation, including a successful demonstration that a neural network could learn to predict mind-matter interaction performance based upon eight environmental variables. Evidence for a time-and space-like equilibrium principle was also observed in the data

POSSIBLE INFLUENCE OF THE GEOMAGNETIC FIELD ON SPORTS PERFORMANCE

If human behavior and performance are affected by minute changes in the earth's geomagnetic field, as suggested by a growing body of evidence, then one might also expect to see such influences reflected in skilled physical performance, such as sports. To explore this possibility, scores from a mixed-gender, candlepin competitive bowling league were correlated with daily planetary geomagnetic flux. Results indicated that geomagnetic fluctuations the day before bowling accounted for a significant percentage (40%) of the variance in men's bowling scores. The same relationship was not independently significant for women's scores, but the correlation was opposite to men's scores