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Search Results: 1 - 10 of 138731 matches for " K. Behrens "
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Quality assessment of heterogeneous surface radiation network data
R. Becker ,K. Behrens
Advances in Science and Research (ASR) , 2012, DOI: 10.5194/asr-8-93-2012
Abstract: The DWD national radiation measurement network comprises 82 automatic sites, 29 manned sites with shaded and unshaded pyranometer and the BSRN station at Lindenberg. The quality assessment routinely applied takes into account the basic astronomical and empirical considerations as well as some interdependencies like total to diffuse flux relation and cross checking with sunshine duration. A more advanced quality assessment approach attempts to routinely utilise timeseries of clear sky radiative transfer simulations for every site. For that purpose a link to cloud coverage obtained from Meteosat second generation geostationary satellite data, highly resolved in time and space, was established. There is a predefined calibration cycle of 30 month for automatic stations. Data analysis on this timescale allows for the detection of sensor degradation, wrong calibration or configuration and other possible local disturbances. Furthermore using satellite cloud mask enables the identification of larger clear sky regions characterized by similar atmospheric conditions. Thus, in a regionalization step correction or recalibration of moderate quality data to a higher level can be considered. The paper provides an overview of DWD surface radiation network and the current activities to improve automatic quality assessment using remotely sensed data and clear sky modeling for the upgrading of radiation data.
A group-randomized controlled trial for health promotion in Girl Scouts: Healthier Troops in a SNAP (Scouting Nutrition & Activity Program)
Richard R Rosenkranz, Timothy K Behrens, David A Dzewaltowski
BMC Public Health , 2010, DOI: 10.1186/1471-2458-10-81
Abstract: Seven Girl Scout troops were randomized to intervention (n = 3, with 34 girls) or standard-care control (n = 4, with 42 girls) conditions. Girls ranged in age from 9 to 13 years (mean 10.5 years). Intervention troop leaders were trained to implement policies promoting physical activity (PA) and healthful eating opportunities at troop meetings, and to implement a curriculum promoting obesity-prevention behaviors at home. The primary outcome variable was child body mass index (BMI) z-score. Secondary outcomes included accelerometer-assessed PA levels in troop meetings, direct observations of snack offerings, time spent in physically active meeting content, and leader encouragement of PA and healthful eating.The intervention was delivered with good fidelity, and intervention troops provided greater opportunities for healthful eating and PA (x2 = 210.8, p < .001), relative to control troops. In troop meetings, intervention troop leaders promoted PA (x2 = 23.46, p < .001) and healthful eating (x2 = 18.14, p < .001) more frequently, and discouraged healthful eating and PA less frequently (x2 = 9.63, p = .002) compared to control troop leaders. Most effects of the intervention on individual-level variables of girls and parents were not significantly different from the control condition, including the primary outcome of child BMI z-score (F1, 5 = 0.42, p = .544), parent BMI (F1, 5 = 1.58, p = .264), and related behavioral variables. The notable exception was for objectively assessed troop PA, wherein girls in intervention troops accumulated significantly less sedentary (x2 = 6.3, p = .011), significantly more moderate (x2 = 8.2, p = .004), and more moderate-to-vigorous physical activity, (x2 = 18.4, p < .001), than girls in control troops.Implementing a health promotion curriculum and supporting policies to provide more healthful environments in Girl Scout troop meetings appears feasible on a broader scale. Additional work is needed to bridge health promotion from such sett
The Arctic Sea ice in the CMIP3 climate model ensemble – variability and anthropogenic change
L. K. Behrens,T. Martin,V. A. Semenov,M. Latif
The Cryosphere Discussions , 2012, DOI: 10.5194/tcd-6-5317-2012
Abstract: The strongest manifestation of global warming is observed in the Arctic. The warming in the Arctic during the recent decades is about twice as strong as in the global average and has been accompanied by a summer sea ice decline that is very likely unprecedented during the last millennium. Here, Arctic sea ice variability is analyzed in the ensemble of CMIP3 models. Complementary to several previous studies, we focus on regional aspects, in particular on the Barents Sea. We also investigate the changes in the seasonal cycle and interannual variability. In all regions, the models predict a reduction in sea ice area and sea ice volume during 1900–2100. Toward the end of the 21st century, the models simulate higher sea ice area variability in September than in March, whereas the variability in the preindustrial control runs is higher in March. Furthermore, the amplitude and phase of the sea ice seasonal cycle change in response to enhanced greenhouse warming. The amplitude of the sea ice area seasonal cycle increases due to the very strong sea ice area decline in September. The seasonal cycle amplitude of the sea ice volume decreases due to the stronger reduction of sea ice volume in March. Multi-model mean estimates for the late 20th century are comparable with observational data only for the entire Arctic and the Central Arctic. In the Barents Sea, differences between the multi-model mean and the observational data are more pronounced. Regional sea ice sensitivity to Northern Hemisphere average surface warming has been investigated.
Birds (Aves), Serrania Sadiri, Parque Nacional Madidi, Depto. La Paz, Bolivia
Hosner, P. A.,Behrens, K. D.,Hennessey, A. B.
Check List , 2009,
Abstract: We surveyed the Serrania Sadiri for birds at elevations between 500-950m for a combined total of 15 days in threedifferent months. The area surveyed was along the Tumupasa/San Jose de Uchupiamones trail at the edge of ParqueNacional Madidi in Depto. La Paz, Bolivia. We report observations of 231 species of birds detected by sight and sound,including many outlying ridge specialists. We report and present photographs of a new species for Depto. La Paz(Caprimulgis nigrescens), the second Bolivian localities for Porphyrolaema prophyrolaema, Zimerius cinereicapillus,and Basileuterus chrysogaster, and five new species records for Parque Nacional Madidi.
El consulado general de México en Marsella bajo Gilberto Bosques y la huída del sur de Francia de axiliados germanoparlantes 1940-1942
Benedikt Behrens
Tzintzun. Revista de Estudios Históricos , 2003,
Abstract: El artículo trata del papel de la diplomacia mexicana en el rescate de refugiados germanoparlantes antinazis (escritores, intelectuales, activistas y funcionarios políticos) que habían huído de las tropas invasores alemanas a la zona aún no ocupada en el sur de Francia durante los a os 1940-1942. El rol protagonista en este proceso lo jugó el Consulado General de México establecido en el puerto de Marsella en el verano de 1940, bajo responsabilidad de Gilberto Bosques. El Consulado se transformó rápidamente en un centro de coordinación para la ayuda material y el rescate de refugiados centroeuropeos (además de miles de republicanos espa oles) a través de la expedición de visas de emigración -a veces falsificadas para proteger a los perseguidos políticos y raciales - y de fungir como receptor y transmisor de recursos económicos de las organizaciones de apoyo a los refugiados establecidas en Francia, México y Estados Unidos, con el fin de asegurar la supervivencia de los refugiados en campos de internación, así como para pagar los pasajes a ultramar. Con su intenso trabajo como vínculo entre los refugiados y las organizaciones internacionales de rescate, el Consulado mexicano en Marsella contribuyó esencialmente a la huída de centenares de refugiados a México y a otros países transatlánticos
Vernacular Names for Butterflies
James Behrens
Psyche , 1874, DOI: 10.1155/1874/52547
Abstract:
Anna Schn delbach: Kriegerwitwen. Lebensbew ltigung zwischen Arbeit und Familie in Westdeutschland nach 1945. Frankfurt am Main u.a.: Campus Verlag 2009.
Petra Behrens
querelles-net , 2009,
Abstract: Anna Schn delbach untersucht in ihrer Dissertation die Strategien der individuellen Lebensbew ltigung von Kriegerwitwen, ihre Handlungsspielr ume und ihre Erfahrungen mit der praktischen Umsetzung der Kriegsopferversorgung in Westdeutschland nach 1945. Durch eine Verbindung von erfahrungsgeschichtlichen Ans tzen und historischer Diskursanalyse verknüpft sie den Blick auf die Kriegerwitwen als handelnde Subjekte mit einer Analyse der zeitgen ssischen Debatten über Lage und Verhalten der Witwen auf den zentralen Konfliktfeldern Versorgung, Ehe/Familie und Erwerbsarbeit. Dabei wird deutlich, wie sich die Frauen verschiedene sie betreffende Diskurse aneigneten, für die Artikulation eigener Interessen nutzten und eigenes soziales und kulturelles Kapital in der Auseinandersetzung mit den Beh ren aktivierten. In her dissertation, Anna Schn delbach examines the individual life-coping strategies of war widows, their latitude and their experience with the practical application of West German war victim provisions after 1945. By conjoining historical approaches based in experience with historical discourse analysis the author is able to connect an examination of these war widows as acting subjects with an analysis of contemporary debates on the war widows’ situation and their behavior toward central contentious areas: provision, marriage/family, and employment. It becomes clear how the women appropriated those different discourses affecting them, utilized these to articulate their own interests, and activated their own social and cultural capital in their conflict with public authorities.
Katholische Leitbilder von Ehe und Familie zwischen gesellschaftlicher Realit t und politischer Auseinandersetzung Catholic Models of Marriage and the Family—Between Social Reality and Political Debate
Petra Behrens
querelles-net , 2001,
Abstract: auer. Obwohl nicht im Zentrum der Untersuchung stehend, werden dabei auf allen vier Ebenen Aspekte der Rekonstruktion der Geschlechterbeziehungen in der Nachkriegszeit berührt. der relations is not central to the R lli-Alkempter’s book, all four sections touch on aspects of the reconstruction of gender relationships in the post-war period.
Die Umstrukturierung des Ingenieurberufs und die Mobilisierung der Frauen als Ressource im Systemwettstreit Restructuring the Engineering Profession and the Mobilization of Women as a Resource in System Competition
Petra Behrens
querelles-net , 2005,
Abstract: Karin Zachmann geht in ihrer Habilitationsschrift, die Ans tze der Technik- und der Geschlechtergeschichte sowie der neueren DDR-Forschung aufgreift, den Auseinandersetzungen zwischen technischer und politischer Elite um einen grundlegenden Umbau des Ingenieurberufs in der SBZ/DDR nach. Sie untersucht für den Zeitraum von 1945 bis zum 1971 erfolgten Machtwechsel von Ulbricht zu Honecker, wie die politische Elite ihren Anspruch auf eine umfassende Verfügbarkeit technischen Wissens geltend machte und welche Auswirkungen dieses auf das berufliche Selbstverst ndnis der technischen Experten hatte. Dabei stehen die Feminisierungsprozesse und die Verschiebungen in der geschlechtlichen Codierung des Ingenieurberufs, die mit einer verst rkten Mobilisierung von Frauen für technische Berufe einhergingen, im Zentrum. Die auf einer breiten Quellengrundlage basierende Studie gibt nicht nur Aufschluss über die Frage nach den Handlungsspielr umen der technischen Experten in der DDR, sondern stellt zudem einen wichtigen Beitrag zur Dekonstruktion der staatssozialistischen Geschlechterordnung“ dar. In her advanced dissertation, Karin Zachmann pursues the dispute between the technical and political elite over fundamental reconstruction in the Soviet Occupied Territory/German Democratic Republic. She takes as her starting points both the history of technology and gender as well as newer GDR-research. She examines how the political elite asserted their claim to total access to technical knowledge and what effect this had on the professional self-conception of technical experts in the time period between 1945 and the 1971 successful exchange of power from Ulbrecht to Honecker. Central to the study are the feminization processes and the shift in the gender-coding of the engineering profession. This was accompanied by an increased mobilization of women for technical professions. The study, which is founded on a broad array of sources, not only sheds light on the question as to the scope of the technical experts in the GDR, but also represents an important contribution to the “deconstruction of the socialist state’s gender order.”
Buildings, elliptic curves, and the K(2)-local sphere
Mark Behrens
Mathematics , 2005,
Abstract: We investigate a dense subgroup Gamma of the second Morava stabilizer group given by a certain group of quasi-isogenies of a supersingular elliptic curve in characteristic p. The group Gamma acts on the Bruhat-Tits building for GL_2(Q_l) through its action on the l-adic Tate module. This action has finite stabilizers, giving a small resolution for the homotopy fixed point spectrum (E_2^hGamma)^hGal by spectra of topological modular forms. Here, E_2 is a version of Morava E-theory and Gal = Gal(barF_p/F_p).
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