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Multiple sclerosis (MS) is a debilitating neurological disease associated with a variety of psychological, cognitive, and motoric symptoms. Walking is among the most important functions compromised by MS. Dual-task walking (DTW), an everyday activity in which people walk and engage in a concurrent, discrete task, has been assessed in MS, but little is known about how it relates to other MS symptoms. Self-awareness theory suggests that DTW may be a function of the interactions among psychological, cognitive, and motor processes.
Method:
Cognitive testing, self-report assessments for depression and falls self-efficacy (FSE), and walk evaluations [DTW and single-task walk (STW)] were assessed in seventy-three people with MS in a clinical care setting. Specifically, we assessed whether psychological factors (depression and FSE) that alter subjective evaluations regarding one’s abilities would moderate the relationships between physical and cognitive abilities and DTW performance.
Results:
DTW speed is related to diverse physical and cognitive predictors. In support of self-awareness theory, FSE moderated the relationship between STW and DTW speeds such that lower FSE attenuated the strength of the relationship between them. DTW costs – the change in speed normalized by STW speed – did not relate to cognitive and motor predictors. DTW costs did relate to depressive symptoms, and depressive symptoms moderated the effect of information processing on DTW costs.
Conclusions:
Findings indicate that an interplay of physical ability and psychological factors – like depression and FSE – may enhance understanding of walking performance under complex, real-world, DTW contexts.
Double-crop grain sorghum after winter wheat harvest is a common cropping system in the southern plains region. Palmer amaranth is a troublesome weed in double-crop grain sorghum in Kansas. Populations resistant to various herbicides (e.g., atrazine, glyphosate, metsulfuron, pyrasulfotole) have made Palmer amaranth management even more difficult for producers. To evaluate control of atrazine-resistant and atrazine-susceptible Palmer amaranth in double-crop grain sorghum, we assessed 14 herbicide programs, of which 8 were PRE only and 6 were PRE followed by (fb) POST applications. Visible ratings of Palmer amaranth control were taken at 3 and 8 wk after planting (WAP) grain sorghum. PRE treatments containing very-long-chain fatty acid (VLCFA)–inhibiting herbicides provided 91% control of atrazine-resistant Palmer amaranth 3 WAP, and reduced weed density 8 WAP compared to atrazine-only PRE treatments. PRE fb POST treatments, especially those that included VLCFA-inhibiting herbicides, provided greater control (71% to 93%) of both atrazine-resistant and atrazine-susceptible Palmer amaranth, respectively, at 8 WAP compared to PRE treatments alone (59% to 79%). These results demonstrated the utility of VLCFA-inhibiting herbicides applied PRE and in a layered PRE fb POST approach in controlling atrazine-resistant Palmer amaranth, as well as the importance of an effective POST application following residual PRE herbicides for controlling both atrazine-resistant and atrazine-susceptible Palmer amaranth in double-crop grain sorghum.
Few studies have investigated the patterns of posttraumatic stress disorder (PTSD) symptom change in prolonged exposure (PE) therapy. In this study, we aimed to understand the patterns of PTSD symptom change in both PE and present-centered therapy (PCT).
Methods
Participants were active duty military personnel (N = 326, 89.3% male, 61.2% white, 32.5 years old) randomized to spaced-PE (S-PE; 10 sessions over 8 weeks), PCT (10 sessions over 8 weeks), or massed-PE (M-PE; 10 sessions over 2 weeks). Using latent profile analysis, we determined the optimal number of PTSD symptom change classes over time and analyzed whether baseline and follow-up variables were associated with class membership.
Results
Five classes, namely rapid responder (7–17%), steep linear responder (14–22%), gradual responder (30–34%), non-responder (27–33%), and symptom exacerbation (7–13%) classes, characterized each treatment. No baseline clinical characteristics predicted class membership for S-PE and M-PE; in PCT, more negative baseline trauma cognitions predicted membership in the non-responder v. gradual responder class. Class membership was robustly associated with PTSD, trauma cognitions, and depression up to 6 months after treatment for both S-PE and M-PE but not for PCT.
Conclusions
Distinct profiles of treatment response emerged that were similar across interventions. By and large, no baseline variables predicted responder class. Responder status was a strong predictor of future symptom severity for PE, whereas response to PCT was not as strongly associated with future symptoms.
Synchrotron X-ray diffraction was used to monitor the hydrothermal precipitation of akaganeite (β-FeOOH) and its transformation to hematite (Fe2O3) in situ. Akaganeite was the first phase to form and hematite was the final phase in our experiments with temperatures between 150 and 200 °C. Akaganeite was the only phase that formed at 100 °C. Rietveld analyses revealed that the akaganeite unit-cell volume contracted until the onset of dissolution, and subsequently expanded. This reversal at the onset of dissolution was associated with a substantial and rapid increase in occupancy of the Cl site, perhaps by OH− or Fe3+. Rietveld analyses supported the incipient formation of an OH-rich, Fe-deficient hematite phase in experiments between 150 and 200 °C. The inferred H concentrations of the first crystals were consistent with “hydrohematite.” With continued crystal growth, the Fe occupancies increased. Contraction in both a- and c-axes signaled the loss of hydroxyl groups and formation of a nearly stoichiometric hematite.
This volume of new essays by leading scholars treats a representative sampling of German realist prose from the period 1848 to 1900, the period of its dominance of the German literary landscape. It includes essays on familiar, canonical authors -- Stifter, Freytag, Raabe, Fontane, Thomas Mann -- and canonical texts, but also considers writers frequently omitted from traditional literary histories, such as Luise Mühlbach, Friedrich Spielhagen, Louise von François, Karl May, and Eugenie Marlitt. The introduction situates German realism in the context of both German literary history and of developments in other European literatures, and surveys the most prominent critical studies of ninteenth-century realism. The essays treat the following topics: Stifter's Brigitta and the lesson of realism; Mühlbach, Ranke, and the truth of historical fiction; regional histories as national history in Freytag's Die Ahnen; gender and nation in Louise von François's historical fiction; theory, reputation, and the career of Friedrich Spielhagen; Wilhelm Raabe and the German colonial experience; the poetics of work in Freytag, Stifter, and Raabe; Jewish identity in Berthold Auerbach's novels; Eugenie Marlitt's narratives of virtuous desire; the appeal of Karl May in the Wilhelmine Empire; Thomas Mann's portrayal of male-male desire in his early short fiction; and Fontane's Effi Briest and the end of realism. Contributors: Robert C. Holub, Brent O. Petersen, Lynne Tatlock, Thomas C. Fox, Jeffrey L. Sammons, John Pizer, Hans J. Rindisbacher, Irene S. Di Maio, Kirsten Belgum, Nina Berman, Robert Tobin, Russell A. Berman. Todd Kontje is professor of German at the University of California, San Diego.
We have developed a 350 μm radiometer to perform automated site testing in remote regions of Antarctica. In summer 2000–2001 the instrument operated at Concordia, a new station under construction at Dome C on the Antarctic Plateau. We present the results, and compare them with the atmospheric opacity measured at the South Pole in the same five-week period. During these five weeks, observing conditions at Dome C were, on average, substantially better than those at the South Pole.
We report an experimental study of photocarrier lifetime, transport, and excitation spectra in silicon-on-insulator doped with sulfur far above thermodynamic saturation. The spectral dependence of photocurrent in coplanar structures is consistent with photocarrier generation throughout the hyperdoped and undoped sub-layers, limited by collection of holes transported along the undoped layer. Holes photoexcited in the hyperdoped layer are able to diffuse to the undoped layer, implying (μτ)h ∼ 5 × 10−9 cm2/V. Although high absorptance of hyperdoped silicon is observed from 1200 to 2000 nm in transmission experiments, the number of collected electrons per absorbed photon is 10−4 of the above-bandgap response of the device, consistent with (μτ)e < 1 × 10−7cm2/V.
Edited by
Judith M. Rumsey, National Institute of Mental Health, Bethesda, Maryland,Monique Ernst, National Institute of Mental Health, Bethesda, Maryland
There are many reasons for seeking to create a global database with which to record the outcomes of therapy for congenital heart disease. Such a database can function as a tool to support a variety of purposes:
This volume brings together some of the leading scholars of German realism working today and testifies to the vitality of the field. It includes essays on familiar authors — Stifter, Freytag, Raabe, Fontane, Thomas Mann — and canonical texts but also considers writers frequently omitted from traditional literary histories, including Luise Mühlbach, Friedrich Spielhagen, Louise von François, Karl May, and Eugenie Marlitt. Although the book does not attempt to cover every author or aspect of the period — which would, in any case, be impossible — an effort has been made to include a representative sampling of German realist prose in the second half of the nineteenth century. While the contributors vary in their choice of topic and approach, they all situate the literary works in their historical context and also suggest reasons why these texts remain of interest today. Thus, the contributors focus on questions of national identity during the period of Germany's first political unification; examine representations of Germans abroad and foreigners at home at a time of mass emigration and colonial expansion; consider attitudes toward work in a period of rapid industrialization; and reflect on questions of sexual identity and gender roles in works by both men and women in the era of the family journal, the first organized women's movements, and the earliest advocates for homosexual rights. Each essay refers to relevant literature on the particular author or topic discussed, and the volume concludes with a complete list of works cited. The book should, therefore, be of interest primarily to students and scholars of German literature but also to those concerned with the topic of realism in literature and questions of subject-formation, national identity, and cultural memory in an era of rapid historical change.
I would like to thank the contributors for their willingness to collaborate on this project, their patience with my demands, their respect for deadlines, and, above all, the quality of their work.
Cathodoluminescence emission spectra and photoluminescence (PL) excitation spectra were used to evaluate Eu+3 and Cr+3 as activators for red luminescence in ZnGa2O4. In the ZnGa2O4:Eu materials red emission from Eu+3 and blue intrinsic emission were observed. The blue intrinsic emission increased relative the Eu+3 emission with increasing current density and is attributed to preferential current saturation of the Eu+3 activators. In addition, PL excitation measurements revealed that the inefficient energy transfer from the ZnGa2O4 host to the Eu+3 is due to poor spectral overlap between the ZnGa2O4 emission and the Eu+3 absorption. Cr-doping resulted in a saturated red-color, and no host emission was observed over the entire current density regime investigated. The PL excitation of the ZnGa2O4:Cr revealed good overlap between the ZnGa2O4 host and the Cr+3 absorption. Efficient energy transfer to the Cr+3 activators occurs via multipolar interactions.
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