Phonological priming in the lexical decision task: regularity effects are not necessary evidence for assembly

The contribution of assembled phonology in reading English was examined in the lexical decision task by comparing two markers: regularity effects and phonological priming. Strategic control was assessed by manipulating the phonological lexicality of the foils: Experiment 1 used legal nonwords, whereas Experiment 2 used pseudohomophones. Replicating existing findings, null regularity effects were obtained in the presence of legal nonwords. Modest regularity effects, in accuracy only, were observed with pseudohomophone foils. In contrast, phonological priming effects emerged in each of the experiments, regardless of the presence of regularity effects. Assembled phonology thus constrains reading under conditions that strongly discourage its use. However, regularity effects are not necessary evidence for its presence. The dissociation of regularity and phonological priming effects is discussed in terms of the two-cycles model.     

A three-dimensional heterogeneity analysis of electrochemical energy conversion in SOFC anodes using electron nanotomography and mathematical modeling

In this paper a fully three dimensional, multiphase, micro-scale solid oxide fuel cell anode transport phenomena numerical model is proposed and verified. The Butler-Volmer model was combined with empirical relations for conductivity and diffusivity - notably the Fuller-Shetler-Giddings equation, and the Fickian model for transport of gas reagents. FIB-SEM tomography of a commercial SOFC stack anode was performed and the resulting images were processed to acquire input data. A novel method for estimating local values of Triple Phase Boundary length density for use in a three-phase, three-dimensional numerical mesh was proposed. The model equations are solved using an in-house code and the results were verified by comparison to an analytical solution within the range of its applicability. A limited parametric study was performed to qualitatively assess simulation performance and impact of heterogeneity. Despite the high dependence of the SOFC anode performance on the geometry of its anisotropic, three-phase microstructure there are very few micro-scale numerical models simulating transport phenomena within these electrodes.     

Soldering of Mg Joints Using Zn-Al Solders

Magnesium has applications in the automotive and aerospace industries that can significantly contribute to greater fuel economy and environmental conservation. The Mg alloys used in the automotive industry could reduce mass by up to 70 pct, providing energy savings. However, alongside the advantages there are limitations and technological barriers to use Mg alloys. One of the advantages concerns phenomena occurring at the interface when joining materials investigated in this study, in regard to the effect of temperature and soldering time for pure Mg joints. Eutectic Zn-Al and Zn-Al alloys with 0.05 (wt pct) Li and 0.2 (wt pct) Na were used in the soldering process. The process was performed for 3, 5, and 8 minutes of contact, at temperatures of 425 °C, 450 °C, 475 °C, and 500 °C. Selected, solidified solder-substrate couples were cross-sectioned, and their interfacial microstructures were investigated by scanning electron microscopy. The experiment was designed to demonstrate the effect of time, temperature, and the addition of Li and Na on the kinetics of the dissolving Mg substrate. The addition of Li and Na to eutectic Zn-Al caused to improve mechanical properties. Higher temperatures led to reduced joint strength, which is caused by increased interfacial reaction.     

Universal constraints on the sound structure of language: Phonological or acoustic?

Languages are known to exhibit universal restrictions on sound structure. The source of such restrictions, however, is contentious: Do they reflect abstract phonological knowledge, or properties of linguistic experience and auditory perception? We address this question by investigating the restrictions on onset structure. Across languages, onsets of small sonority distances are dispreferred (e.g., lb is dispreferred to bn). Previous research with aural materials demonstrates such preferences modulate the perception of unattested onsets by English speakers: Universally ill-formed onsets are systematically misperceived (e.g., lba → leba) relative to well-formed onsets (e.g., bn). Here, we show that the difficulty to process universally ill-formed onsets extends to printed materials. Auxiliary tests indicate that such difficulties reflect phonological, rather than orthographic knowledge, and regression analyses demonstrate such knowledge goes beyond the statistical properties of the lexicon. These findings suggest that speakers have abstract, possibly universal, phonological knowledge that is general with respect to input modality. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

IQ level and performance on the Halstead-Reitan Neuropsychological Test Battery for Older Children.

121 9–14 yr olds were divided into 4 groups based on their WISC-R Full Scale IQ score: (a) 70–79, (b) 80–89, (c) 90–99, and (d) >100. Performance of these 4 groups was compared on the Halstead-Reitan Neuropsychological Test Battery for Children (HRNTBC) using a multiple-levels-of-inference framework: (a) level of performance, (b) pattern of performance, and (c) right–left hand differences. Results indicate a significant influence of IQ on level of performance for 6 of 14 test measures. Tests of problem-solving abilities, language skills and auditory perceptual analysis were most affected, whereas little influence was observed for tests of basic and simple motor functions. Right–left hand differences were also unaffected by IQ level. Results call attention to the importance of considering IQ level in the interpretation of performance on the HRNTBC. (16 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Are phonological representations of printed and spoken language isomorphic? Evidence from the restrictions on unattested onsets.

Are the phonological representations of printed and spoken words isomorphic? This question is addressed by investigating the restrictions on onsets. Cross-linguistic research suggests that onsets of rising sonority are preferred to sonority plateaus, which, in turn, are preferred to sonority falls (e.g., bnif, bdif, lbif). Of interest is whether these grammatical preferences constrain the recognition of auditory and printed words by speakers of English--a language in which such onsets are unattested. Five experiments compare phonological lexical decision responses to nonwords, including unattested onsets, through either aural or visual presentation. Results suggest that both hearers and readers are sensitive to the phonotactics of unattested onsets. However, the phonotactic generalizations of hearers and readers differ on their scope and source. Hearers differentiated all three types of onsets (e.g., bnif, bdif, and lbif), and their behavior implicated both grammatical and statistical constraints. In contrast, readers were able to differentiate only those structures similar to attested English onsets from dissimilar structures (i.e., bnif vs. bdif or lbif), and their preferences reflected statistical knowledge alone. These findings suggest that the phonological representations informing lexical decision to spoken and printed words are not isomorphic. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Depression among acute spinal cord injury patients: A study utilizing the Zung Self-Rating Depression Scale.

Administered the Self-Rating Depression Scale (SRDS) an average of 63 days post-injury to 58 acute spinal cord injury (SCI) patients (aged 18–55 yrs) and 51 age-matched healthy controls (CTLs). Mean SRDS scores were 37.1 for CTLs and 49.0 for SCI Ss. Several factors, including age, yrs of education, level of injury (paraplegic vs quadriplegic), etiology of injury (violent vs nonviolent), presence of acute closed head injury, or recent history of alcohol or substance abuse, had no association with SRDS scores. Since undiagnosed and untreated depression may compromise an SCI patient's adaptation to injury and motivation during rehabilitation, abnormally elevated SRDS scores may help to determine which patients might require more focused psychological assessment and treatment. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Interfacial reactions of Sn–Zn–Ag–Cu alloy on soldered Al/Cu and Al/Al joints

This work shows the effect on the soldering process of the addition of Ag and Cu to Sn–Zn alloys. Soldering of Al/Cu and Al/Al joints was performed for a time of 3?min, at a temperature of 250°C, with the use of flux. Aging was carried out at 170°C for Al/Cu and Al/Al joints for 1 and 10 days. During the aging process, intermetallic layers grew at the interface of the Al/Cu joint at the Cu substrate. Intermetallic layers were not observed during wetting of Al/Al joints. On the contrary, dissolution of the Al substrate and migration of Al-rich particles into the bulk of the solder were observed. The experiment was designed to demonstrate the effect of Ag and Cu addition on the dissolution of Al substrate during the soldering and aging processes. In the solder alloys, small precipitates of AgZn₃ and Cu₅Zn₈ were observed.