RESUMEN
We study critical random Boolean networks with two inputs per node that contain only canalyzing functions. We present a phenomenological theory that explains how a frozen core of nodes that are frozen on all attractors arises. This theory leads to an intuitive understanding of the system's dynamics as it demonstrates the analogy between standard random Boolean networks and networks with canalyzing functions only. It reproduces correctly the scaling of the number of nonfrozen nodes with system size. We then investigate numerically attractor lengths and numbers, and explain the findings in terms of the properties of relevant components. In particular we show that canalyzing networks can contain very long attractors, albeit they occur less often than in standard networks.
RESUMEN
The effects of anesthesia in elective operations on the cognitive functioning of the elderly, was examined in 88 patients aged 60-90 years. These patients were assessed pre-operatively and at a week and three months post-operatively. Forty patients (44.5%) received general anesthesia and 48 (54.5%) received regional anesthesia. The results show no significant difference between the two anesthetic methods. Differences were noted in remote memory index between the three examination time periods. (In contrast to a later work, it was found that patients whose cognitive state had been low deteriorated more than others). The only differences found between younger and older patients were in remote, recent and immediate memory. One of the major conclusions was that the effects of the methods of anesthesia, general and regional, are no different in young and elderly patients.
RESUMEN
The spectrum of doubly ionized molybdenum (Mo III) was produced in a sliding spark discharge and recorded photographically on the NIST 10.7-m normal incidence spectrograph in the 800-3250 Å spectral region. The analysis has led to the establishment of 76 levels of the interacting 4d4, 4d3 5s and 4d2 5s2 even configurations, 73 levels of the interacting 4d3 5d and 4d3 6s even configurations, and 181 levels of the interacting 4d3 5p and 4d2 5s5p odd configurations. Approximately 3100 lines have been classified as transitions between these experimentally determined levels. Comparison between the observed levels and those calculated from matrix diagonalizations with least-squares fitted parameters shows standard deviations of 44, 33, and 183 cm-1, respectively, for the levels of the three sets of configurations.
RESUMEN
The spectrum of doubly ionized tungsten (W III) was produced in a sliding-spark discharge and recorded photographically on the NIST 10.7-m normal-incidence vacuum spectrograph in the 600-2680 Å spectral region. The analysis has led to the establishment of 71 levels of the interacting 5d4, 5d3 6s and 5d2 6s2 even configurations and 164 levels of the interacting 5d3 6p and 5d2 6s 6p odd ones. A total of 2636 lines have been classified as transitions between the 235 experimentally determined levels. Comparison between the observed levels and those calculated from matrix diagonalizations with least-squares fitted parameters shows an rms deviation of ±87 cm-1 for the even configurations and ±450 cm-1 for the odd ones.
RESUMEN
The NBS 10.7-m vacuum spectrograph was used in the second order to obtain precision measurements of three N I lines at 1492-1495 A (2p(3)(2)D degrees -2p(2)3s(2)P) and four at 1742-1745 A (2p(3)(2)P degrees -2p(2) 3(s)(2)P). By combining these values with other available information on the energy levels of the neutral nitrogen atom, seventy-eight calculated wavelengths of N I from 908 A to 1745 A are given with uncertainties of 0.001 A or less.