The septuagenerian as child psychotherapist: A change in career orientation at the end of the stream.

The writer describes his experiences when, at an advanced age, he became therapist to severely disturbed, disorganized, nonverbal children. The therapeutic approaches evolved and the personality changes that occurred in him as a result of the therapeutic interchanges with his young patients are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

A mixed-variable continuously deforming finite element method for parabolic evolution problems. Part II: The coupled problem of phase-change in porous media

The conceptual framework of a least squares rate variational approach to the formulation of continuously deforming mixed-variable finite element computational scheme for a single evolution equation was presented in Part I.¹ In this paper (Part II), we extend these concepts and present an adaptively deforming mixed variable finite element method for solving general two-dimensional transport problems governed by a system of coupled non-linear partial differential evolution equations. In particular, we consider porous media problems that involve coupled heat and mass transport processes that yield steep continuous moving fronts, and abrupt, discontinuous, moving phase-change interfaces. In this method, the potentials, such as the temperature, pressure and species concentration, and the corresponding fluxes, are permitted to jump in value across the phase-change interfaces. The equations, and the jump conditions, governing the physical phenomena, which were specialized from a general multiphase, multiconstituent mixture theory, provided the basis for the development and implementation of a two-dimensional numerical simulator. This simulator can effectively resolve steep continuous fronts (i.e. shock capturing) without oscillations or numerical dispersion, and can accurately represent and track discontinuous fronts (i.e. shock fitting) through adaptive grid deformation and redistribution. The numerical implementation of this simulator and numerical examples that demonstrate the performance of the computational method are presented in Part III² of this paper.     

Adherence of human vaginal lactobacilli to vaginal epithelial cells and interaction with uropathogens

Three strains of Lactobacillus, identified as Lactobacillus acidophilus, Lactobacillus gasseri, and Lactobacillus jensenii, were selected from among 70 isolates from the vaginas of healthy premenopausal women for properties relevant to mucosal colonization or antagonism. All three self-aggregated and adhered to epithelial vaginal cells, displacing well-known vaginal pathogens, such as G. vaginalis, and inhibiting the growth in vitro of Escherichia coli and Streptococcus agalactiae. The surface components involved in self-aggregation appeared to be proteins for L. gasseri and lipoproteins for L. acidophilus and L. jensenii, as judged by susceptibility to treatment with appropriate degrading enzymes. The factors responsible for adherence to epithelial vaginal cells seemed to be glycoproteins (L. acidophilus and L. gasseri) and carbohydrate (L. jensenii). The receptors of the vaginal cells were glycolipids, which presumably were the targets of the competition observed between the lactobacilli and the pathogenic microbes.     

Microstructure of GaN deposited by lateral confined epitaxy on patterned Si (111)

Lateral confined epitaxy (LCE) is an epitaxial growth method on substrates patterned to form uniform mesas separated by trenches for laterally restricting growth area. In this work, plan view and cross-sectional transmission electron microscopy (TEM) were used in order to characterize the microstructure of GaN films grown by metal-organic chemical vapor deposition on patterned Si (111) using the LCE method. Two kinds of propagation modes of the dislocations were observed. The dislocations in the center of the mesa mainly propagate vertically to the surface. On the other hand, dislocations close (1–2 μm) to the mesa edges tend to bend laterally, allowing dislocation reactions that result in a lower dislocation density. This suggests that the overall material quality improves with decreasing mesa size, which is consistent with the observed increase in photoluminescence band edge peak intensity.     

Millimeter Wave Power Combiner Based on a Half-Open Resonator

Experimental investigations of quasi-optical power combiner based on a half-open resonator are described. Power and frequency characteristics have been studied for one or three diodes. It is shown that the positioning of the diodes is preferred over the center of the field spot along a resonator axis.     

An inverse finite element minimization-based method for solution of multi-dimensional phase-change and material boundary shapes

An inverse finite element method for solution of unknown multidimensional phase-change and material boundary shapes is presented. The method is based on minimization and requires boundary shape parametrization. The unknown boundary parameters are determined by minimizing the error between a limited number of known (e.g. measured) temperatures and the temperatures associated with the iteratively altered boundary. The algorithm presented is based on the multidimensional downhill simplex minimization method. The inverse method is illustrated and verified using a model of the plasma arc welding process. In particular, it is shown that the technique is capable of accurately determining a specified weld pool capillary interface shape using a limited number of simulated thermocouple measurements. The code's ability to determine the interface shape is investigated under various interface-thermocouple separations, using varying numbers of simulated thermocouples.