16. Using the Arts and New Media in Community Organizing and Community Building: An Overview and Case Study from Post-Katrina New Orleans was published in Community Organizing and Community Building for Health and Welfare on page 288.
Our findings have potential clinical implications as the difficulties in the processing of positive facial expressions in depression may lead to less maternal responsiveness to positive affect in the offspring and may diminish the quality of the mother-child interactions. Results for participants with GAD are consistent with the literature demonstrating that persons with GAD are intolerant of uncertainty and seek reassurance due to their worries.
The study of chaos in the last 20 years had a tremendous impact on the foundations of the sciences and on engineering. Synchronization [Afraimovich, Verichev & Rabinovich, 1986; Pecora & Carroll, 1990] and control [Ott, Grebogy & Yorke, 1990] of chaos have recently aroused a great deal of interests in light of their potential applications in engineering.
Abstract : We have made significant research progress on several related aspects of our research grant during this period. (1) advanced the study of generalized chaotic synchronization schemes, (2) research on impulsive and practical impulsive control theories for chaotic systems, (3) exploring military applications of chaotic spread-spectrum communication system, (4) developing the key technologies for digitizing chaotic synchronization schemes: namely, control of chaotic systems via sampled-data feedback control, and (5) successful experimental implementation of chaotic spread-spectrum communication systems and secure communication system based on chaotic circuits and hyperchaotic circuits.
Lower strength steels have traditionally been considered to be immune to embrittlement in the presence of hydrogen gas. In this work, it is demonstrated that contrary to conventional wisdom, there are two regions of fatigue crack growth where hydrogen gas causes significant accelerations in crack propagation rates compared to air. Environmental influences in these two regimes are shown to be dominated by entirely different mechanisms.
A microbial culture enriched from a trichloroethene-contaminated groundwater aquifer reductively dechlorinated trichloroethene (TCE) and tetrachloroethene (PCE) to ethene. Initial PCE dechlorination rate studies indicated a first-order dependence with respect to substrate at low PCE concentrations, and a zero-order dependence at high concentrations. Studies of TCE and vinyl chloride (VC) dechlorination indicated a first-order dependence at all substrate concentrations. VC had little or no effect on the initial rate of TCE dechlorination. With subsaturating concentrations of chlorinated ethenes, nearly stoichiometric amounts of the toxic intermediate vinyl chloride accumulated prior to its dechlorination to ethene. In contrast, under saturating conditions, in which a dense, nonaqueous-phase liquid existed in equilibrium with the aqueous phase, the chlorinated ethene was dechlorinated to ethene, at a rapid rate, with the accumulation of relatively small amounts of chlorinated intermediates.
Abstract Ecosystem processes are influenced by weather and climatic perturbations at multiple temporal scales with a large range of amplitudes and phases. Technological advances of automated biometeorological measurements provide the opportunity to apply spectral methods on continuous time series to identify differences in amplitudes and phases and relationships with weather variation. Here we used wavelet coherence analysis to study the temporal covariance between soil CO 2 production and soil temperature, soil moisture, and photosynthetically active radiation (PAR). Continuous (hourly average) data were acquired over 2 years among three vegetation types in a semiarid mixed temperate forest. We showed that soil temperature and soil moisture influence soil CO 2 production differently at multiple periods (e.g. hours, days, weeks, months, years), especially after rain pulse events. Our results provide information about the periodicity of soil CO 2 production among vegetation types, and provide insights about processes controlling CO 2 production through the study of phase relationships between two time series (e.g. soil CO 2 production and PAR). We tested the performance of empirical models of soil CO 2 production using the continuous wavelet transform. These models, built around soil temperature and moisture, failed at multiple periods across the measured dates, suggesting that empirical models should include other factors that regulate soil CO 2 production at different temporal scales. Our results add a new dimension for the analysis of continuous time series of biometeorological measurements and model testing, which will prove useful for analysis of increasing sensor data obtained by environmental networks.
Abstract In this paper, the deterministic prediction of damage, via damage function analysis (DFA), which provides a robust technology for estimating the damage function at future times, is described. General analytical expressions for calculating the damage functions that can be used with arbitrary dependencies of pit nucleation rate, pit growth law and repassivation rate on the system parameters have been obtained. The application of DFA to the prediction of pitting damage is illustrated by reference to pitting corrosion of iron in neutral solutions.
