870 research outputs found
Dr. Gerd J. Horten Professor of History - Concordia University Portland
No full textGerd Horten, author of the book \u27Radio Goes to War: The Cultural Politics of Propaganda during World War II\u27, discusses World War II propaganda and censorship. Recorded by Phil Sedgwick.
Video uploaded by Phil Sedgwick under Standard YouTube Licensehttps://commons.cu-portland.edu/humfacultymedia/1000/thumbnail.jp
Endogenous Fixprices and Sticky Price Adjustment of Risk-averse Firms
No full textA risk-averse price-setting firm which knows the quantity demanded at the status quo price but has imperfect information otherwise may choose not to change it although an otherwise identical risk-neutral firm would do so, provided the variance of the firm's subjective probability distribution over quantities demanded as a function of price displays a kink at the status quo. This is equivalent to risk aversion of order one. When no such endogenous fixprice exists, the size of price adjustment still tends to zero as risk aversion tends to infinity, and to any arbitrarily small menu cost there exists a degree of risk aversion so that the firm will not adjust.fixed prices, price adjustment, risk aversion, menu cost
Mann : Lothar Schreyer ; Rekonstruktion der Aufführung von 1920 ; Aufführungen 18./19./20./21. Mai 86 in der Halle für Wechselausstellungen
No full textFoto: Gerd Weigelt. Gestaltung: W. J. Jokisch. Kunstsammlung Nordrhein-WestfalenFoto: bunte Skulptur (Körper mit Kopf
Treating gastro-oesophageal reflux disease (GERD) with sense
No full textGastro-esophageal reflux disease (GERD) is a common disorder that affects an estimated 5 % to 7 % of the global population. Management of GERD often poses a number of challenges. In this article, the author presents a number of management modalities for this condition.peer-reviewe
La place de la guerre de 1914-1918 dans l'histoire culturelle de l'Allemagne
No full textThe place of the 1914-1918 war in the cultural history of Germany, Gerd Krumeich.
Through his study of war accounts and memories, the author analyses the impact of the war experience on German culture in its individual as well as its collective aspects. That impact brought about the continuation and the diffusion of militarism and nationalism in much of the German society of the 1920s and 1930s.Krumeich Gerd. La place de la guerre de 1914-1918 dans l'histoire culturelle de l'Allemagne. In: Vingtième Siècle, revue d'histoire, n°41, janvier-mars 1994. La guerre de 1914-1918. Essais d'histoire culturelle. pp. 9-17
Differences in cerebral response to esophageal acid stimuli and psychological anticipation in GERD subtypes-An fMRI study
No full textBackground: To evaluate whether there are differences in the cerebral response to intraesophageal acid and psychological anticipation stimuli among subtypes of gastroesophageal reflux disease (GERD)
The dusty torus in the Circinus galaxy: a dense disk and the torus funnel
No full textContext. With infrared interferometry it is possible to resolve the nuclear dust distributions that are commonly associated with the dusty torus in active galactic nuclei (AGN). The Circinus galaxy hosts the closest Seyfert 2 nucleus and previous interferometric observations have shown that its nuclear dust emission is particularly well resolved.Aims. The aim of the present interferometric investigation is to better constrain the dust morphology in this active nucleus.Methods. To this end, extensive new observations were carried out with the MID-infrared Interferometric instrument (MIDI) at the Very Large Telescope Interferometer, leading to a total of 152 correlated flux spectra and differential phases between 8 and 13 μm. To interpret this data, we used a model consisting of black-body emitters with a Gaussian brightness distribution and with dust extinction.Results. The direct analysis of the data and the modelling confirm that the emission is distributed in two distinct components: a disk-like emission component with a size (FWHM) of ~0.2 × 1.1 pc and an extended component with a size of ~0.8 × 1.9 pc. The disk-like component is elongated along PA ~ 46° and oriented perpendicular to the ionisation cone and outflow. The extended component is responsible for 80% of the mid-infrared emission. It is elongated along PA ~ 107°, which is roughly perpendicular to the disk component and thus in polar direction. It is interpreted as emission from the inner funnel of an extended dust distribution and shows a strong increase in the extinction towards the south-east. We find both emission components to be consistent with dust at T ~ 300 K, that is we find no evidence of an increase in the temperature of the dust towards the centre. From this we infer that most of the near-infrared emission probably comes from parsec scales as well. We further argue that the disk component alone is not sufficient to provide the necessary obscuration and collimation of the ionising radiation and outflow. The material responsible for this must instead be located on scales of ~1 pc, surrounding the disk. We associate this material with the dusty torus.Conclusions. The clear separation of the dust emission into a disk-like emitter and a polar elongated source will require an adaptation of our current understanding of the dust emission in AGN. The lack of any evidence of an increase in the dust temperature towards the centre poses a challenge for the picture of a centrally heated dust distribution
Augmenting a pH Medical Study with Wearable Video for Treatment of GERD
No full textIn this paper we present an augmentation to the wearable computers typically used to determine if a patient is a candidate for surgery to correct problems associated with Gastroesophageal Reflux Disease (GERD). A wearable camera was used by the first author while participating in a 24–hour stomach acid pH study. After the study’s conclusion, an examination of the captured video and pH record revealed some results that allowed the first author to avoid many of the activities that result in symptoms related to GERD. 1 GERD and Medical Testing Gastroesophageal Reflux Disease is a medical condition that affects 2 % of the adult population of the United States. GERD refers to the reflux of stomach acid into the esophagus and can lead to complications such as esophageal cancer and lung damage. The most common symptom of GERD is heartburn. Typical treatments for GERD include diet modification and medication; however, for some patients these treatments may prove ineffective, and the patient may be evaluated for more drastic measures such as surgery. If surgery to correct GERD is considered an option, the patient usually undergoes a 24 – or 48–hour pH study to measure the percentage of time that the patient is in reflux during normal daily activities. In the 24–hour study, a pH probe is inserted into the subject’s nose and lowered through the esophagus to a position above the stomach. Since the probe is attached to a line that is retained in the patient’s nose and throat, several pH sensors can be placed at varying locations along the patient’s esophagus. The probe is attached to a wearable computer which records the patient’s pH levels for 24 hours. The patient typically uses the wearable computer to record times of meals, periods spent in a supine position (e.g. sleeping), and occurrences of symptoms. The first author suffered from severe and relatively un
Linguistics and Life. Autobiographical snapshots
No full textAnhand einer Reihe von autobiographischen „Selfies“ wird ein Leben als eine Folge von aufgeschnappten Meinungen konfrontiert. Vor allem mit dem, was Gerd Antos in und mit der Linguistik im Laufe sejner Karriere dazugelernt hat. Linguistik sozusagen als ein lebenslanges learning by doing.Through a series of autobiographical snapshots the author confronts his life as a sequence of picked‑up views. The emphasis will be on the new things Gerd Antos learned with and within linguistics over the course of his career. Linguistics as a life‑long ‘learning by doing’ as it were
Clumpy Dust Tori in Active Galactic Nuclei
No full textActive Galactic Nuclei (AGN) are amongst the most luminous objects in the universe. The source of their activity is accretion onto a supermassive black hole in the center of the galactic nucleus. The various phenomena observed in AGN are explained in a common unification scheme. The cornerstone of this unification scheme of AGN is the presence of an optically and geometrically thick dust torus which surrounds the central accretion disk and broad-line region (BLR). This parsec-scaled torus is responsible for the apparent difference between type 1 and type 2 AGN. If the line-of-sight intersects with the torus, the accretion disk and BLR are not visible and the AGN is classified as a type 2 object. On the other hand, if the torus is seen nearly face-on, the accretion disk and BLR are directly exposed to the observer, so that the galaxy appears as a type 1 AGN. Near- (NIR) and mid-infrared (MIR) interferometry has resolved, for the first time, the dust torus around the nearby prototypical Seyfert 2 AGN NGC 1068. These observations provided an insight into the structure of the torus: Apparently, the dust is not smoothly distributed in the torus but arranged in clumps -- contrary to what has been commonly used in models. We developed a new radiative transfer model of clumpy dust tori which is a key tool to interpret NIR and MIR observations of AGN. The model accounts for the 3-dimensional arrangement of dust clouds. Model SEDs and images can be obtained for a number of different physical parameters (e.g., radial and vertical dust density distribution, cloud radii, optical depths, etc.). It was shown that the model SEDs are in agreement with observed spectral properties. Moreover, we applied our new model to the data of NGC 1068. It was possible, for the first time, to simultaneously reproduce NIR and MIR interferometry and photometry of the nucleus of NGC 1068. In particular, the model follows the trend of the deeper 9.7 micron silicate absorption features in the correlated fluxes than in the total fluxes, as observed with VLTI/MIDI in the 8-13 micron band. Comparison with the NGC 1068 multi-wavelength SED from Radio to the infrared shows that most of the unresolved MIR flux comes from thermal dust emission inside the torus, while in the NIR a possible synchrotron source or the accretion disk might be seen through "holes" in the clumpy torus. To get a better idea how much the accretion disk contributes to the NIR emission of AGN, we studied NIR colors of a sample of type 1 AGN which were observed in J-, H-, and K-band with HST/NICMOS. By comparing the observed colors with those expected from torus models, we found out that the accretion disk contributes typically We studied the feedback of AGN radiation on the dust torus. It was found out that dust which is smoothly distributed cannot withstand the radiation pressure from the AGN. On the other hand, self-gravitating clouds in clumpy tori can efficiently compensate the AGN radiation pressure. A physically-motivated clumpy torus model was used to study the impact of the AGN radiation on obscuration properties of the torus. We showed that below an AGN luminosity of ~10^42 erg/s, the associated low accretion rates can no longer support an obscuring torus. In the high-luminosity regime, large clouds become unbound so that the torus is dominated by smaller clouds. As a result, the covering factor and apparent scale height decrease with luminosity, so that the fraction of type 1 AGN should become larger at higher luminosities (and high radiative efficiencies). This picture offers a physical explanation for the long-standing "receding torus" phenomenon. One of the major astronomical discoveries within the last year was the identification of type 2 counterparts of QSOs. These objects were the "missing link" in the unification scheme. We studied restframe optical-to-MIR SEDs of a sample of 21 obscured QSOs with our clumpy torus model. It was found out that the observed SEDs favor models with compact geometries and, apparently, no flaring. In some objects, the combination of blue NIR color and very deep silicate absorption is in contradiction to expectations from torus models. We propose that in such cases, the torus is actually seen face-on, and a detached cold absorber in the host galaxy (e.g., a dust lane or cloud) is responsible for the deep silicate absorption feature. According to this picture, some of the obscured QSOs are mimicking type 2 AGN although their torus orientation might be similar to a type 1 AGN
- …
