Morphologies of uranium and uranium–zirconium electrodeposits

Uranium and uranium–zirconium electrodeposits produced in the Fuel Cycle Facility at Argonne National Laboratory-West were examined using standard metallurgical techniques. Substantial differences in the morphologies of the two types of deposits were observed. Samples from pure uranium deposits were comprised of chains of uranium crystals with a characteristic rhomboidal shape, while the morphologies of samples from deposits containing zirconium in excess of approximately 0.5 wt% showed more polycrystalline features. Zirconium was found to be present as a second, zirconium metal phase at or very near the uranium–zirconium dendrite surfaces. Higher collection efficiencies and total deposit weights were observed for the uranium–zirconium deposits; this performance increase is likely a result of better mechanical properties exhibited by the uranium–zirconium dendrite morphology.     

Call for papers and proposals for special issues: Expanding the scope of research and theory published in School Psychology Quarterly.

In my editorial statement in the last issue I indicated that "School Psychology Quarterly should be comprehensive in its coverage of our field [and]...it is my perception that the Quarterly needs to improve significantly in this regard" (Gutkin, 1998, p. 4). Extending the breadth of research and theory that appears in our journal is, in fact, one of my most central goals as your new Editor. While extraordinary and superb scholarly work has often been published in the Quarterly, and I have every desire to continue supporting these historically prevalent and crucial lines of scientific inquiry, it is my clear sense that focusing only on "more of the same" will not be sufficient to meet the future needs of either our readership or their clients. A broader array of perspectives and research questions are needed. Thus, I am issuing a "Call for Papers and Proposals for Special Issues" to begin the process of expanding the scope of scholarly work published in the Quarterly. My express purpose is to stimulate an ever-growing range of high quality research and theoretical work being submitted to the Quarterly. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The effect of stimulatory electrode placement on F-wave latency measurements

BACKGROUND AND PURPOSE: The purpose of this study was to compare the effects of two commonly used stimulating electrode placements on F-wave latency. SUBJECTS: Fifty healthy subjects aged 20 to 47 years were tested. METHODS: F-waves were obtained from median and ulnar nerves bilaterally. A total of 200 nerves were tested. RESULTS: A paired t-test indicated a statistically significant difference in F-wave latency between the two stimulating electrode placements. Stepwise linear regression equations demonstrated that our results were consistent with previously published studies. CONCLUSION AND DISCUSSION: Although a statistically significant difference exists between the two techniques, the magnitude of the difference is not likely to be clinically important. Therefore, the most important factor may be to use a consistent technique when investigating potential neuropathies.     

The role of parents and older siblings in predicting adolescent substance use: Modeling development via structural equation latent growth methodology.

Using latent growth curve methodology, this study investigated developmental trends in adolescent, parent, and older sibling substance use across a 3-year period and the predictive effect of these trends on adolescent substance use 2 years later. Participants were 101 adolescents (50 boys and 51 girls) who were an average of 12.34 years old at the first assessment, their parents, and an older sibling. Results indicate that although both parents and siblings contribute to the level of adolescent use, only siblings appear to contribute to the adolescents' subsequent substance use development. The adolescents' developmental trajectory was the best predictor of later use, but siblings contributed to later use indirectly through their influence on adolescents' substance use development. Findings discuss the role of sibling and parent substance use on adolescent substance use and emphasize the utility of latent growth modeling in the study of developmental change. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Differential scanning calorimetry index for estimating level of saturation in transesterified wax esters

Differential scanning calorimetry (DSC) thermograms of fatty esters can give valuable information on melting characteristics and heats-of-fusion enthalpy (ΔH). A series of jojoba liquid wax esters was constructed by transesterifying native jojoba oil with 5–50% completely hydrogenated jojoba wax esters. This series, when subjected to a standardized DSC tempering method with heating/cooling cycles, exhibited an excellent correlation for level of saturation based on area changes in endothermic ΔH. Endothermic events were recorded for native (ΔH_A) and completely hydrogenated (ΔH_C) jojoba wax esters. A third endotherm, ΔH_B, was observed when they were transesterified. Based on a multiple regression program, the best fit (R²=0.98) using ΔH data was: % saturation=16.847–0.162 (ΔH_A)+0.209 (ΔH_B)+0.600 (ΔH_C). Standard errors for predictions were approximately 1.045 at 0% saturation, 0.770 at 25% saturation, and 1.158 at 50% saturation. Endothermic events A, B, and C each represent the respective diunsaturated, mounounsaturated, and saturated contents of wax esters in the transesterified blends. This was verified by measuring the dropping points for both the native and completely hydrogenated wax esters. These findings provide an index which can predict the degree of saturation in transesterified wax ester blends and serves as a research tool in process and product developments. Presented at the 1995 AOCS Meeting, May 7–11, 1995, San Antonio, Texas. Retired.     

General education teachers' knowledge and self-reported use of classroom interventions for working with difficult-to-teach students: Implications for consultation, prereferral intervention and inclusive services.

Twenty 3rd- and 4th-grade teachers were interviewed about working with difficult-to-teach students (e.g, children with specific learning disabilities, mild mental handicaps, behavior disorders) in their classrooms. Using a referral case and a standardized vignette, teachers described problems, goals, interventions, data collection, and consultation practices employed across prereferral, prereferral Intervention, referral, and post-referral phases of service delivery. Most participants demonstrated only vague knowledge of classroom interventions. Few accommodations were made in general classrooms for mildly-handicapped children, particularly following the prereferral phase. Participants consulted primarily with other general educators and secondarily with special educators. Consultation with school psychologists was unusual. Discussion focuses on implications for consultation, prereferral intervention, and inclusive services. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The enigma of social support and occupational stress: Source congruence and gender role effects.

Research on the potential ameliorating effects of social support on occupational stress produces weak, inconsistent, and even contradictory results. This study of 117 employees, mostly from a southern U.S. hospital supply company, examined potential moderators that were theorized might reduce the confusion: source congruence (congruence between sources of the stressor and of social support) and gender role. Congruence between the sources of stressors and of social support appeared to make little difference in determining the moderating or buffering effect of social support on the relationship between stressors and strain. Gender role, however, may moderate the relationship between social support and individual strains such that more feminine people react more strongly and positively to social support than more masculine people do. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Deformation mechanisms in superplastic AA5083 materials

The plastic deformation of seven 5083 commercial aluminum materials, produced from five different alloy heats, are evaluated under conditions of interest for superplastic and quick-plastic forming. Two mechanisms are shown to govern plastic deformation in AA5083 over the strain rates, strains, and temperatures of interest for these forming technologies: grain-boundary-sliding (GBS) creep and solutedrag (SD) creep. Quantitative analysis of stress transients following rate changes clearly differentiates between GBS and SD creep and offers conclusive proof that SD creep dominates deformation at fast strain rates and low temperature. Furthermore, stress transients following strain-rate changes under SD creep are observed to decay exponentially with strain. A new graphical construction is proposed for the analysis and prediction of creep transients. This construction predicts the relative size of creep transients under SD creep from the relative size of changes in an applied strain rate or stress. This construction reveals the relative size of creep transients under SD creep to be independent of temperature; temperature dependence resides in the “steady-state” creep behavior to which transients are related.     

Evaluation of Airborne Thermal Infrared Imagery for Locating Mine Drainage Sites in the Lower Youghiogheny River Basin,Pennsylvania, USA

Abstract.  Nighttime high-resolution airborne thermal infrared imagery (TIR) data were collected in the predawn hours during Feb 5-8 and March 11-12, 1999, from a helicopter platform for 72.4 km of the Youghiogheny River, from Connellsville to McKeesport, in southwestern Pennsylvania. The TIR data were used to identify sources of mine drainage from abandoned mines that discharge directly into the Youghiogheny River. Image-processing and geographic information systems (GIS) techniques were used to identify 70 sites within the study area as possible mine drainage sources. The combination of GIS datasets and the airborne TIR data provided a fast and accurate method to target the possible sources. After field reconnaissance, it was determined that 24 of the 70 sites were mine drainage. This paper summarizes: the procedures used to process the TIR data and extract potential mine-drainage sites; methods used for verification of the TIR data; a discussion of factors affecting the TIR data; and a brief summary of water quality.     

A class of exact solutions for population balances with arbitrary internal coordinates

We develop a novel transformation that maps the linear, nonhomogeneous, multidimensional population balance equation (PBE) into an advection equation that is readily solved using the method of characteristics. The PBEs targeted by this transformation exclude aggregation, breakage, and time dependent birth and death rates. In addition, internal coordinates are assumed to grow independently of each other. The ensuing general formulation is then used to recover closed‐form analytical solutions for problems with monosurface and bulk‐diffusion growth‐rates as well as Gaussian‐type nucleation. For completeness, we derive the multidimensional Green's functions for our approach. This is followed by a brief discussion on how the proposed framework may be used for code verification of moment methods such as the quadrature method of moments and the direct quadrature method of moments. Finally, a sample Mathematica code is provided to derive analytical solutions for the single‐internal‐coordinate case given user‐specified growth, birth, and death rates. © 2015 American Institute of Chemical Engineers AIChE J, 61: 1691–1698, 2015