An evolved cognitive–behavioral view of the case of David.

A cognitive–behavioral conceptualization of depression is presented, identifying distorted perceptions, ineffective actions, and/or an unresponsive environment as possible causative factors. Acknowledging that information about a patient’s early history can inform the cognitive–behavior therapist about possible areas of vulnerability that are triggered by current life events, a transtheoretical case formulation model is presented and illustrated for the case of David. The case formulation highlights the intrapersonal and interpersonal issues that should be the focus of the therapeutic intervention, and an integrated cognitive–behavioral intervention that follows from this formulation is described. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Optimization of stirrer designs in a reverberation chamber

This paper describes an investigation into the key factors which contribute to an effective mode stirrer. The work concentrates on the lower frequency range, since all stirrers have poorer performance at low frequencies. The stirrer's shapes and sizes have been investigated, together with an optimization of the finer details in the stirrer's shape. The modeling of the mode stirred chamber has been performed using the transmission-line matrix (TLM) method. Software has been developed which, for each position of the rotating stirrer, builds the shape of the stirrer using thin, perfectly conducting boundaries. Results indicate that the design of the stirrer's basic shape has a small but significant impact on its performance. A genetic algorithm has been used to optimize certain parameters in the shape of the stirrer, and a fitness factor based on a free space model of the stirrer has been used. The free space model runs 1500 times faster than the model in the chamber. The optimization is shown to improve the stirrer's performance in three different sizes of chamber. Computer modeling has been verified by measurements performed in the chamber at the University of York.     

Radio frequency electromagnetic fields in large conducting enclosures: effects of apertures and human bodies on propagation and field-statistics

Radio frequency propagation in an electrically large resonant chamber (a screened room) was simulated by two models: a statistical combination of multiple resonant modes and a computational electromagnetic simulation [the transmission line matrix (TLM) method]. The purpose of this work was to investigate the effects of passengers and windows on electromagnetic fields (EMF) in aircraft and other vehicles. Comparison of the multimode models with measurements made in a screened room showed that as the electromagnetic losses increased, the transmission between two internal antennas was reduced, and there were fewer turning points in its frequency response. The autocorrelation of this frequency response provided a useful estimate of the composite Q-factor of the resonances and showed that the Q of the chamber was reduced from a value of the order of 10 000 when emptied to 1000 when windows were added and when filled with people to 100. The TLM simulation provided further useful information about the statistical variation of electric field strength with position.     

Nightmares and annihilation anxiety.

Evaluated the relation between self-reported frequency of nightmares, a number of saliency measures of the nightmare experience, and a self-report measure of annihilation anxiety (appended) for 1,357 undergraduates from 2 independent populations. A significant positive relation was found between nightmare frequency and salience and annihilation anxiety. Findings were cross-validated across both samples. Results are discussed within the context of object relations and ego psychology theory utilizing an ego boundary model and are consistent with previous research (e.g., E. Hartmann, 1991) demonstrating boundary impairment in Ss with self-reported frequent nightmares. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Electron Paramagnetic Resonance Spectroscopic Determination of Ti3+ in Several Titanium Phosphate Compounds

Electron paramagnetic resonance (EPR) spectroscopy was used to test the presence of Ti³⁺ in several novel compounds also containing Ti⁴⁺. The results obtained confirmed the presence of Ti³⁺, and indicated that differences in the EPR spectral lines of Ti³⁺ can make differentiation easier between compounds which have X-ray diffraction (XRD) patterns that are not markedly different.     

Analysis of heat transfer for compressible flow in two-dimensional porous media

Gas from a reservoir at constant pressure and temperature is forced through a two-dimensional porous region. The surface through which the gas exits is at a specified uniform temperature and pressure. The local gas and solid matrix temperatures are assumed equal. General solutions for the local temperature and pressure in the porous medium are found as a function of a potential. This potential can be determined by solving Laplace's equation in the porous region for a simple set of boundary conditions, and the temperature and pressure will then be known functions of position. Because of the nature of the boundary conditions it is particularly convenient to solve Laplace's equation by conformai mapping. By using this technique some illustrative heat and mass flow results were calculated for a porous wall with a step in thickness, a wall supplied with gas through periodic slots, and an eccentric annular region.     

Removal of heavy metals from aqueous systems with thiol functionalized superparamagnetic nanoparticles

We have shown that superparamagnetic iron oxide (Fe3O4) nanoparticles with a surface functionalization of dimercaptosuccinic acid (DMSA) are an effective sorbent material for toxic soft metals such as Hg, Ag, Pb, Cd, and Tl, which effectively bind to the DMSA ligands and for As, which binds to the iron oxide lattices. The nanoparticles are highly dispersible and stable in solutions, have a large surface area (114 m2/g), and have a high functional group content (1.8 mmol thiols/g). They are attracted to a magnetic field and can be separated from solution within a minute with a 1.2 T magnet. The chemical affinity, capacity, kinetics, and stability of the magnetic nanoparticles were compared to those of conventional resin based sorbents (GT-73), activated carbon, and nanoporous silica (SAMMS) of similar surface chemistries in river water, groundwater, seawater, and human blood and plasma. DMSA-Fe3O4 had a capacity of 227 mg of Hg/g, a 30-fold larger value than GT-73. The nanoparticles removed 99 wt% of 1 mg/L Pb within a minute, while it took over 10 and 120 min for Chelex-100 and GT-73 to remove 96% of Pb.