196,234 research outputs found
Testosterone and sleep-related erections: An overview
No full textSleep-related erections have been reported to occur from the intrauterine life to senescence. It has been speculated that the main function of nocturnal erections is to provide adequate engorgement of the corpora cavernosa, which then leads to increased tissue oxygenation. This is in turn to prevent cavernous fibrosis, the histopathological basis for corporeal venoocclusive dysfunction, which probably is the most common cause of organic erectile dysfunction. It has been suggested that sleep-related erections are triggered by the release of nitric oxide by the nitrergic nerve fibers within the cavernous nerves. Androgens regulate this mechanism as well as some other non-nitrergic processes within the corpora cavernosa and within the central nervous system. By contrast, the erectile response to tactile or visual erotic stimuli in wakefulness predominantly involves an androgen-independent system, although it may, at least to a certain degree, also be influenced by androgen-sensitive mechanisms. No doubt, androgens are key players in the physiology of nocturnal erections, and the availability of new, user-friendly testosterone preparations such as transdermal gel and intramuscularly administered testosterone undecanoate stimulates further investigations on this field. The prospect that the quality of sleep may also be improved by an androgen therapy administered to improve sleep-related erections in hypogonadal men needs further basic research and appropriate clinical studies
Electrostatic interactions in critical solvents
No full textThe subtle interplay between critical phenomena and electrostatics is investigated by considering the effective force acting on two parallel walls confining a near-critical binary liquid mixture with added salt. The ion-solvent coupling can turn a non-critical repulsive electrostatic force into an attractive one upon approaching the critical point. However, the effective force is eventually dominated by the critical Casimir effect, the universal properties of which are not altered by the presence of salt. This observation allows a consistent interpretation of recent experimental data
Erbauliche Lebens-Beschreibung
No full textEnthält Beiträge von: "... Jo. Henr. a Seelen ...", "... M. Daniel Friedrich Lucius ...", "... M. David Andreas Fritsche, Diac. Pegav. ...", "... M. Johann Christian Horn ..." und "... Johann Paul Oettel ..."Vorlageform der Veröffentlichungsangabe: Lejpzjg, Gedruckt bey Gottfried Rothen. - Erscheinungsdatum nach Datierung im Titel bestimm
Teil I
No full textIm Grabungsabschnitt „Mittlere Unterstadt II“ sind insgesamt 732 Grabkomplexe eines parthisch-römischen Gräberfeldes (Friedhofs) ausgegraben worden. Sie sind einschließlich der anthropologischen Untersuchungen in den Bänden BATSH 5, 13-1 und 13-2 publiziert. Der abschließenden Bewertung von B. Wehry zufolge (BATSH 13-2) wurde das Gräberfeld in vier Zeitstufen vom Ende des 3. Jahrhunderts v. Chr. bis ins 3. Jahrhundert n.Chr. belegt. Zusammen mit den gleichzeitigen Siedlungsbefunden im Grabungsabschnitt Tell/Zitadelle (BATSH 2) entsteht das seltene Ensemble einer Stadt und eines Gräberfeldes, das mit dem Ortsnamen „Magdala“ identifiziert werden kann. Mit Blick auf die bekannten eher dürftigen schriftlichen und materiellen Zeugnissen trägt das Ensemble „Stadt und Friedhof von Magdala“ erheblich zu unser Kenntnis über parthisch-römische Berührungen im umkämpften Grenzbereich am Habur und am Mittleren Euphrat bei.
In diesem Band werden die archäologischen Befunde von 313 Grabkomplexen vorgelegt (M. Novák und A. Oettel, Kap. X). M. Novák typologisiert die Gräber (Kap. II), A. Oettel die Beigaben (Kap. III), und C. Römer handelt die Keramik ab (Kap. IV). Daraus ergibt sich eine erste chronologische Bewertung (M. Novák und A. Oettel, Kap. V). In Kap. VI folgt dann die Darlegung der Ergebnisse der anthropologischen Untersuchungen von C. Witzel, H. Schutkowski und B. Ehlken. Auf der Grundlage dieser beiden Eckpfeiler nehmen M. Novák und A. Oettel eine kultursoziologische Interpretation (Kap. VII) und eine Einordnung in den kulturhistorischen Kontext vor (Kap. VIII), in dem die Bedeutung für Nordmesopotamien diskutiert wird.In the excavation unit „Central Lower Town II” 732 graves of a Parthian-Roman cemetery were excavated. Including the anthropological investigations, they are published in the volumes BATSH 5, 13-1, and 13-2. According to the final assessment by B. Wehry (BATSH 13-2) the cemetery was occupied in four intervals from the end of the 3rd century BC to the beginning of the 3rd century AD. Corresponding to the excavated levels of a contemporary settlement on the citadel/Tell published in BATSH 2 this evidence constitutes a rare ensemble of a town with its adjacent cemetery and of its population that is associated with the place name Magdala. In view of the known rather scanty textual and material sources this archaeological evidence contributes to our knowledge about the Parthian-Roman contacts in this heavily contested border region of the Habur and the Middle Euphrates.
This volume catalogues the archaeological record of 313 graves (M. Novák and A. Oettel, chap. X). They are classified in chap. II (M. Novák); the grave goods are presented in chap. III (A. Oettel), and the pottery in chap. IV (C. Roemer). On this basis a preliminary chronological assessment is derived in chap. V (M. Novák and A. Oettel). The results of the anthropological investigations are presented in chap. VI (C. Witzel, H. Schutkowski, B. Ehlken). Based on these two columns of evidence M. Novák and A. Oettel give a socio-cultural interpretation (chap. VII) and an assessment of the cultural-historical context (chap. VIII) in which they discuss the significance of this new archaeological evidence
Solvent-mediated interactions between nanoparticles at fluid interfaces
No full text03.09.12 KB. Accepted version, ok to add to Spiral
Nucleon mass and pion loops: renormalization
No full textUsing Dyson-Schwinger equations, the nucleon propagator is analyzed nonperturbatively in a field-theoretical model for the pion-nucleon interaction. Infinities are circumvented by using pion-nucleon form factors which define the physical scale. It is shown that the correct, finite, on-shell nucleon renormalization is important for the value of the mass shift and the propagator. For physically acceptable forms of the pion-nucleon form factor the rainbow approximation together with renormalization is inconsistent. Going beyond the rainbow approximation, the full pion-nucleon vertex is modeled by its bare part plus a one-loop correction including an effective Δ. It is found that a consistent value for the nucleon mass shift can be obtained as a consequence of a subtle interplay between wave function and vertex renormalization. Furthermore, the bare and renormalized pion-nucleon coupling constants are approximately equal, consistent with results from the cloudy bag model.M. Oettel and A. W. Thoma
Nucleon mass and pion loops
No full textPoincaré covariant Faddeev equations for the nucleon and Δ are solved to illustrate that an internally consistent description in terms of confined-quark and non-point-like confined-diquark correlations can be obtained. πN-loop induced self-energy corrections to the nucleon’s mass are analyzed and shown to be independent of whether a pseudoscalar or pseudovector coupling is used. Phenomenological constraints suggest that this self-energy correction reduces the nucleon’s mass by up to several hundred MeV. That effect does not qualitatively alter the picture, suggested by the Faddeev equation, that baryons are quark-diquark composites. However, neglecting the π loops leads to a quantitative overestimate of the nucleon’s axial-vector diquark component.M. B. Hecht, C. D. Roberts, M. Oettel, A. W. Thomas, S. M. Schmidt, P. C. Tand
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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