Search Results - (Author, Cooperation:Widenhorn)
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1Articles: DFG German National LicensesWidenhorn, Ralf ; Mündermann, Lars ; Rest, Armin ; Bodegom, Erik
[S.l.] : American Institute of Physics (AIP)
Published 2001Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: We present the results of a systematic study of the dark current in each pixel of a charged-coupled device chip. It was found that the Arrhenius plot, at temperatures between 222 and 291 K, deviated from a linear behavior in the form of continuous bending. However, as a first approximation, the dark current, D, can be expressed as: D=D0 exp(−ΔE/kT), where ΔE is the activation energy, k is Boltzmann's constant, and T the absolute temperature. It was found that ΔE and the exponential prefactor D0 follow the Meyer–Neldel rule (MNR) for all of the more than 222,000 investigated pixels. The isokinetic temperature, T0, for the process was found as 294 K. However, measurements at 313 K did not show the predicted inversion in the dark current. It was found that the dark current for different pixels merged at temperatures higher than T0. A model is presented which explains the nonlinearity and the merging of the dark current for different pixels with increasing temperature. Possible implications of this finding regarding the MNR are discussed. © 2001 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
2Articles: DFG German National LicensesRest, Armin ; Mündermann, Lars ; Widenhorn, Ralf ; Bodegom, Erik ; McGlinn, T. C.
[S.l.] : American Institute of Physics (AIP)
Published 2002Staff ViewISSN: 1089-7623Source: AIP Digital ArchiveTopics: PhysicsElectrical Engineering, Measurement and Control TechnologyNotes: We present results of a systematic study of persistent, or residual, images that occur in charged-coupled device (CCD) detectors. A phenomenological model for these residual images, also known as "ghosting," is introduced. This model relates the excess dark current in a CCD after exposure to the number of filled impurity sites which is tested for various temperatures and exposure times. We experimentally derive values for the cross section, density, and characteristic energy of the impurity sites responsible for the residual images. © 2002 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
3Articles: DFG German National LicensesStaff View
ISSN: 0309-1651Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyType of Medium: Electronic ResourceURL: -
4Articles: DFG German National LicensesLobmayer ; Tölken ; Widenhorn ; König, W. ; Wierig ; Ollendorff-Curth, Helene ; Reiche, A. ; Petri, Else ; Opitz ; Autoreferat
Springer
Published 1933Staff ViewISSN: 1437-1596Source: Springer Online Journal Archives 1860-2000Topics: MedicineLawType of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesStaff View
ISSN: 1432-1440Source: Springer Online Journal Archives 1860-2000Topics: MedicineNotes: Zusammenfassung Die Bedeutung urologisch-chirurgischer Erkrankungen im Kindes- und besonders im Säuglingsalter und deren durchaus aussichtsreiche Therapie und Prognose bei rechtzeitigem chirurgischem Eingreifen nach genauer urologischer Untersuchung wird betont. Die größere Häufigkeit hämatogen entstandener Nierenerkrankungen gegenüber dem geringeren Auftreten aszendierender Formen von urologischen Erkrankungen wird besonders hervorgehoben. In der Literatur von 1900 bis heute sind 4 Fälle bekannt von Säuglingspyonephrose, die durch Nephrektomie geheilt wurden, denen sich als fünfter geheilter Fall der hier beschriebene anschließt.Type of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesStaff View
ISSN: 1435-2451Keywords: Carcinoma of the pancreas ; Duodenopancreatectomy ; Biliodigestive bypass ; Pankreascarcinom ; Duodenopankreatektomie ; Biliodigestive AnastomoseSource: Springer Online Journal Archives 1860-2000Topics: MedicineDescription / Table of Contents: Zusammenfassung Der Krankheitsverlauf von 22 wegen Pankreaskopfcarcinom duodenopankreatektomierten Patienten wurde verglichen mit 36 nicht pankreasresezierten Patienten, bei denen eine biliodigestive Anastomose bei vergleichbarem Tumorstadium angelegt wurde. Es fand sich hierbei kein Unterschied in der postoperativen Letalität (13,6 % bzw. 13,8 %) noch im Langzeitüberleben beider Gruppen: unabhängig von der operativen Verfahrenswahl waren sämtliche Patienten 2 Jahre postoperativ verstorben. Lediglich für einen größeren Anteil von Patienten (66 % vs. 33 %) konnte eine zeitlich längere Palliation (32 vs. 20 Wochen) nach Duodenopankreatektomie im Vergleich zur Bypass-Operation erreicht werden.Notes: Summary The clinical course of 22 patients who underwent duodenopancreatectomy for carcinoma of the pancreas head was compared to that of 36 patients with tumors at an identical stage that were treated by biliodigestive bypass. No differences were found as regards postoperative lethality (13.6 % vs. 13.8 %) or long-term survival of the two groups: all patients, independent of the surgical procedure, were dead 2 years postoperatively. The duration of palliation after duodenopancreatectomy was slightly longer (32 vs. 20 weeks for a larger percentage of patients (66 % vs. 33 %) than after the bypass procedure.Type of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesStaff View
ISSN: 1435-2451Source: Springer Online Journal Archives 1860-2000Topics: MedicineType of Medium: Electronic ResourceURL: -
8FIS Bildung LiteraturdatenbankTheyßen, H. [Verfasser] ; Struzyna, S. [Verfasser] ; Heinze, C. [Verfasser] ; Widenhorn, R. [Verfasser] ; Mylott, E. [Verfasser]
Published 2013Staff ViewType of Medium: OnlinePublication Date: 2013Keywords: Versuch ; Physik ; Praktikum ; OnlineIn: Bernholt, Sascha (Hrsg.), Inquiry-based Learning - Forschendes Lernen., Kiel: IPN-Verlag (2013), S. 689-691, 978-3-89088-360-1Language: German