Over two decades of blended and online physics courses at Michigan State University

In Fall 1992, our first physics course offered online homework. Over two decades later, we have seven physics courses online, spanning the whole range of introductory course offerings, with a total of over 1600 students in 2014. We found that several of the the purely online courses had better learning success than traditional lecture courses, as measured by exam scores. Particularly successful were online materials with embedded assessment. This result can be interpreted in different ways, but may serve as an indicator that during in-class lectures, we are oftentimes not taking advantage of the fact that we have the students on-site.

Holocene climatic change and the development of the lake-effect snowbelt in Michigan, USA

Lake-effect snow is an important constraint on ecological and socio-economic systems near the North American Great Lakes. Little is known about the Holocene history of lake-effect snowbelts, and it is difficult to decipher how lake-effect snowfall abundance affected ecosystem development. We conducted oxygen-isotope analysis of calcite in lake-sediment cores from northern Lower Michigan to infer Holocene climatic variation and assess snowbelt development. The two lakes experience the same synoptic-scale climatic systems, but only one of them (Huffman Lake) receives a significant amount of lake-effect snow. A 177-cm difference in annual snowfall causes groundwater inflow at Huffman Lake to be 18O-depleted by 2.3‰ relative to O'Brien Lake. To assess when the lake-effect snowbelt became established, we compared calcite-δ18O profiles of the last 11,500 years from these two sites. The chronologies are based on accelerator-mass-spectrometry 14C ages of 11 and 17 terrestrial-plant samples from Huffman and O'Brien lakes, respectively. The values of δ18O are low at both sites from 11,500 to 9500 cal yr BP when the Laurentide Ice Sheet (LIS) exerted a dominant control over the regional climate and provided periodic pulses of meltwater to the Great Lakes basin. Carbonate δ18O increases by 2.6‰ at O'Brien Lake and by 1.4‰ at Huffman Lake between 9500 and 7000 cal yr BP, suggesting a regional decline in the proportion of runoff derived from winter precipitation. The Great Lakes snowbelt probably developed between 9500 and 5500 cal yr BP as inferred from the progressive 18O-depletion at Huffman Lake relative to O'Brien Lake, with the largest increase of lake-effect snow around 7000 cal yr BP. Lake-effect snow became possible at this time because of increasing contact between the Great Lakes and frigid arctic air. These changes resulted from enhanced westerly flow over the Great Lakes as the LIS collapsed, and from rapidly rising Great Lakes levels during the Nipissing Transgression. The δ18O difference between Huffman and O'Brien lakes declines after 5500 cal yr BP, probably because of a northward shift of the polar vortex that brought increasing winter precipitation to the entire region. However, δ18O remains depleted at Huffman Lake relative to O'Brien Lake because of the continued production of lake-effect snow.

Footprint of recycled water subsidies downwind of Lake Michigan

Continental evaporation is a significant and dynamic flux within the atmospheric water budget, but few methods provide robust observational constraints on the large-scale hydroclimatological and hydroecological impacts of this ‘recycled-water' flux. We demonstrate a geospatial analysis that provides such information, using stable isotope data to map the distribution of recycled water in shallow aquifers downwind from Lake Michigan. The δ2H and δ18O values of groundwater in the study region decrease from south to north, as expected based on meridional gradients in climate and precipitation isotope ratios. In contrast, deuterium excess (d = δ2H − 8 × δ18O) values exhibit a significant zonal gradient and finer-scale spatially patterned variation. Local d maxima occur in the northwest and southwest corners of the Lower Peninsula of Michigan, where ‘lake-effect' precipitation events are abundant. We apply a published model that describes the effect of recycling from lakes on atmospheric vapor d values to estimate that up to 32% of recharge into individual aquifers may be derived from recycled Lake Michigan water. Applying the model to geostatistical surfaces representing mean d values, we estimate that between 10% and 18% of the vapor evaporated from Lake Michigan is re-precipitated within downwind areas of the Lake Michigan drainage basin. Our approach provides previously unavailable observational constraints on regional land-atmosphere water fluxes in the Great Lakes Basin and elucidates patterns in recycled-water fluxes that may influence the biogeography of the region. As new instruments and networks facilitate enhanced spatial monitoring of environmental water isotopes, similar analyses can be widely applied to calibrate and validate water cycle models and improve projections of regional hydroecological change involving the coupled lake-atmosphere-land system. Read More: http://www.esajournals.org/doi/abs/10.1890/ES12-00062.1

Memoirs pour deux juifs de Metz contre l'hôtel de Ville et le corps des marchands de Thionville

par Pierre Louis Lacretelle

Denkschrift über die Wiener October-Revolution : ausführliche Darstellung aller Ereignisse aus ämtlichen Quellen geschöpft, mit zahlreichen Urkunden begleitet, dann nach eigenen Erlebnissen und nach authentischen Berichten von Augenzeugen und Autoritäten ; nebst einem Rückblick auf die vorausgegangenen Zustände vom 13. März bis 5. October 1848, dem Namen-Verzeichnisse der Minister, der Reichstags-Abgeordneten, der Gemeinderäthe, der Nationalgarde-Verwaltungsräthe, dem Stande des Ober-Commando-Offizier-Corps, der Nationalgarde- und der k. k. Militär-Macht

Boberach: Die Ereignisse zwischen dem 6. und 31. Oktober 1848 werden Tag für Tag durch Dokumente belegt und kommentiert

Sendschreiben an die Redakteure der in Leipzig erscheinenden Deutschen Kriegerzeitung : Wilucki, Oberlieutenant im 2. Linien-Inf.-Regt., Müller, Oberlieutenant in der Inf.-Garde-Division, Erdmannsdorf, Lieutenant im Leib-Inf.-Regt., v. Zychlinski, Lieutenant im Leib.-Inf.-Regt., Andrée, Lieutenant im Ingenieur-Corps

Boberach: Der Aufsatz "Wie denken Preußens Offiziere von einem deutschen Heere?" hat das Offizierskorps verletzt, daß sich gegen jede Mediatisierung Preußens wendet, weil Preußens Heer allein Deutschland vor dem Untergang retten kann

An sämmtliche Theilnehmer des bisherigen akademischen Juristen-Corps: meine lieben Freunde! Mit dem heutigen Tage beginnt die definitive Organisation der akademischen Legion ...

Welsch (Projektbearbeiter): Ansprache des scheidenden Oberkommandanten des bisherigen akademischen Juristen-Korps

Die Nationalgarde und die sämmtlichen derselben einverleibten Corps richteten gestern an den Magistrat und Bürger-Ausschuß der Stadt Wien ...

Welsch (Projektbearbeiter): Beschluß, gegen ausländische Aufwiegler der Arbeiterbevölkerung Wiens mit aller Strenge vorzugehen

An sämmtliche Compagnien der Nationalgarde, der akademischen Legion und des Bürger-Corps: Der Verwaltungsrath der Nationalgarde hat die wichtige Aufgabe, die Interessen der Nationalgarde ...

Welsch (Projektbearbeiter): Bekräftigung des Beschlusses des Wiener Sicherheitsausschusses, den Verwaltungsrat der Nationalgarde durch Wahlen neu bestimmen zu lassen, da sich dieser zu einer angemessenen Interessenvertretung außerstande gezeigt hat