Klaus Jarmatz et al., eds.: Kritik in der Zeit. Literaturkritik der DDR

2nd edition. Halle/Leipzig: Mitteldeutscher Verlag, 1978. 2 vols., 453 and 485 p. 21,-

Klaus Jarmatz et al., eds.: Kritik in der Zeit. Literaturkritik der DDR

2nd edition. Halle/Leipzig: Mitteldeutscher Verlag, 1978. 2 vols., 453 and 485 p. 21,-

Nyota Thun: Krieg und Literatur. Studien zur sowjetischen Prosa von 1941 bis zur Gegenwart

Berlin: Akademie-Verlag, 1977. 299 p

Experimental refractive indices and theoretical small-particle spectral properties of selected metals

Absorption, scattering, and extinction parameters of small spherical metal particles used as seeding agents to control radiant heat transfer in gaseous nuclear rocket engine

Measuring Claim-Evidence-Reasoning Using Scenario-based Assessments Grounded in Real-world Issues

Improving students’ use of argumentation is front and center in the increasing emphasis on scientific practice in K-12 Science and STEM programs. We explore the construct validity of scenario-based assessments of claim-evidence-reasoning (CER) and the structure of the CER construct with respect to a learning progression framework. We also seek to understand how middle school students progress. Establishing the purpose of an argument is a competency that a majority of middle school students meet, whereas quantitative reasoning is the most difficult, and the Rasch model indicates that the competencies form a unidimensional hierarchy of skills. We also find no evidence of differential item functioning between different scenarios, suggesting that multiple scenarios can be utilized in the context of a multi-level assessment framework for measuring the impacts of learning experiences on students’ argumentation

Kinetic flow performance in nozzles Final report

Engine performance and kinetic flow performance in nozzles using four space storable propellant combination

Elevational sensitivity in an Asian 'hotspot': Moth diversity across elevational gradients in tropical, sub-tropical and sub-alpine China

South-western China is widely acknowledged as a biodiversity 'hotspot': there are high levels of diversity and endemism, and many environments are under significant anthropogenic threats not least climate warming. Here, we explore diversity and compare response patterns of moth assemblages among three elevational gradients established within different climatic bioregions - tropical rain forest, sub-tropical evergreen broad-leaved forest and sub-alpine coniferous forest in Yunnan Province, China. We hypothesised that tropical assemblages would be more elevationally stratified than temperate assemblages, and tropical species would be more elevationally restricted than those in the temperate zone. Contrary to our hypothesis, the moth fauna was more sensitive to elevational differences within the temperate transect, followed by sub-tropical and tropical transects. Moths in the cooler and more seasonal temperate sub-alpine gradient showed stronger elevation-decay beta diversity patterns, and more species were restricted to particular elevational ranges. Our study suggests that moth assemblages are under threat from future climate change and sub-alpine rather than tropical faunas may be the most sensitive to climate change. These results improve our understanding of China's biodiversity and can be used to monitor future changes to herbivore assemblages in a 'hotspot' of biodiversity.Link_to_subscribed_fulltex

Remineralization of demineralized dentin using a dual analog system.

ObjectiveImproved methods are needed to remineralize dentin caries in order to promote conservation of dentin tissue and minimize the surgical interventions that are currently required for clinical treatment. Here, we test the hypothesis that bulk substrates can be effectively mineralized via a dual analog system proposed by others, using a tripolyphosphate (TPP) "templating analog" and a poly(acrylic acid) (PAA) or poly(aspartic acid) (pAsp) "sequestration analog," the latter of which generates the polymer-induced liquid-precursor (PILP) mineralization process studied in our laboratory.Material & methodsDemineralized human dentin slices were remineralized with and without pre-treatment with TPP, using either PAA or pAsp as the PILP process-directing agent. A control experiment with no polymer present was used for comparison.ResultsNo mineralization was observed in any of the PAA groups. In both the pAsp and no polymer groups, TPP inhibited mineralization on the surfaces of the specimens but promoted mineralization within the interiors. Pre-treatment with TPP enhanced overall mineralization of the pAsp group. However, when analysed via TEM, regions with little mineral were still present.ConclusionPoly(acrylic acid) was unable to remineralize demineralized dentin slices under the conditions employed, even when pre-treated with TPP. However, pre-treatment with TPP enhanced overall mineralization of specimens that were PILP-remineralized using pAsp