Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf
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42029 Publications
Einfluss verschiedener Y-86-DOTA-Chelate auf die Bioverteilung von Y-86-markierten DOTA L RNA Oligonukleotiden in Ratten
Schlesinger, J.
Abstract
Ziel/Aim:
Spiegelbildliche Oligonukleotide sind chemisch synthetisierte Desoxyribonukleinsäuren bzw. Ribonukleinsäuren, mit einer nicht natürlich vorkommenden L-Konfiguration der Ribose. Diese Modifizierung der Nukleinsäurestruktur führt zu einer besonders hohen Stabilität gegenüber dem enzymatischen Abbau in biologischen Medien (1). Zur Markierung von L Oligonukleotiden mit dem Positronen emittierenden Radiometall Y-86-Yttrium (t1/2 = 14,7 h) muss das Molekül mit einem Chelator funktionalisiert sein. Der Einfluss unterschiedlicher Y-86-Chelatstrukturen auf die pharmakologischen Eigenschaften von Y-86-Chelat-L Nukleinsäuren wurde am Beispiel eines L RNA 12mers 1 (Sequenz: 5 Aminohexyl UGA CUG ACU GAC-3, MW 3975) untersucht. Dazu wurde die L RNA 1 über zwei verschiedene Chelatoren mit 86Y(III) radiomarkiert und die Bioverteilung in Ratten untersucht.
Methodik/Methods:
Die Modifizierung des L RNA 12mers 1 mit DOTA erfolgte zum einen über einen reaktiven N Succinimidylester 2 zu DOTA L RNA 3, zum anderen über ein Isothiocyanatderivat 4 zu DOTA bz L RNA 5. Die über eine Amidbindung 3 und eine Thioharnstoffbindung 5 DOTA-modifizierten L RNAs wurden anschließend mit Y-86 in radiochemischen Ausbeuten von 76 % bzw. 85 % radiomarkiert (2). Die Identität der Verbindungen 3a und 5a wurde mit geträgerten Y-86/Y-Markierungen und Massenspektrometrie nachgewiesen (3a m/z: 4447,0 [M+H]+; 5a m/z: 4611,3 [M+H]+). Die Bioverteilungsstudien wurden für jede Verbindung mit acht männlichen Wistar Ratten durchgeführt (3a: 240 ± 15 g Gewicht; 5a: 150 ± 7.5 g Gewicht).
Ergebnisse/Results:
Die Untersuchung der Bioverteilung der beiden Y-86-markierten L RNAs 3a und 5a zeigte für beide Substanzen eine hohe renale Ausscheidung, wobei aber eine unterschiedliche Retention der radiomarkierten Verbindungen in Nieren und Nebennieren beobachtet wurde. Der Standardized uptake value (SUV) ereichte für 3a in den Nieren einen Wert von 10 ± 2,0 nach 5 min und 6,1 ± 0,53 nach 60 min. Für die Verbindung 5a stieg der SUV in den Nieren von 13 ± 1,6 nach 5 min auf 14 ± 1,1 nach 60 min. Bemerkenswert hohe SUVs (3,5 ± 0,48 und 3,2 ± 0,33) wurden in den Nebennieren nach 60 min für beide Verbindungen beobachtet. Der SUV anderer Organe lag in dieser Untersuchung für 3a und 5a nach 60 min unter 1,0. Nach 12 h Inkubation in Rattenblut bei 37 °C konnte keine Zersetzung von 5a über HPLC-Analyse beobachtet werden.
Schlussfolgerungen/Conclusions:
Die unterschiedliche chemische Anbindung der Y-86-DOTA Chelate an die L-RNA 1 deutet neben den strukturellen Unterschieden der Y-86-Komplexe in 3a und 5a auf eine starke Beeinflussung der Bioverteilung des L Oligonukleotides hin. Die hohe metabolische Stabilität der L RNA verdeutlicht das Potential von L Oligonukleotiden als molekulare Sonden für die PET.
Literatur/References:
(1) Nat Biotechnol 14 (1996), 1112-5
(2) LDDD 3(5) (2006), 330-5
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Poster
45. Jahrestagung der Deutschen Gesellschaft für Nuklearmedizin, 25.-28.04.2007, Hannover, Deutschland -
Abstract in refereed journal
Nuklearmedizin 46(2007)2, A104
ISSN: 0029-5566
Permalink: https://www.hzdr.de/publications/Publ-10095
Combined 18Fluoro-L-DOPA-PET/CT as a tool for localization diagnostic in patients with congenital hyperinsulinism (CHI)
Blankenstein, O.; Mohnike, W.; Füchtner, F.; Mohnike, K.
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Lecture (Conference)
ESPE / LWPES 7th Joint Meeting Paediatric Endocrinology, 21.-24.09.2005, Lyon, France
Permalink: https://www.hzdr.de/publications/Publ-10094
Effect of Moderate Hypercapnic Hypoxia on Cerebral Dopaminergic Activity and Brain O2 Uptake in Intrauterine GrowthRestricted Newborn Piglets
Bauer, R.; Walter, B.; Vorwieger, G.; Fritz, A.; Füchtner, F.; Zwiener, U.; Brust, P.
Abstract
There is evidence that intrauterine growth restriction (IUGR) is associated with altered dopaminergic function in the immature brain. Compelling evidence exists that in the newborn brain, specific structures are especially vulnerable to O2 deprivation. The dopaminergic system is shown to be sensitive to O2 deprivation in the immature brain. However, the respective enzyme activities have not been measured in the living neonatal brain after IUGR under hypercapnic hypoxia (H/H). Therefore, 18F-labeled 6-fluoro-L-3,4-dihydroxyphenylalanine (FDOPA) together with positron emission tomography was used to estimate the aromatic amino acid decarboxylase activity of the brain of seven normal weight (body weight 2078 +/- 434g) and seven IUGR newborn piglets (body weight 893 +/- 109 g). Two positron emission tomography scans were performed in each piglet. All animals underwent a period of normoxia and moderate H/H. Simultaneously, cerebral blood flow was measured with colored microspheres and cerebral metabolic rate of O2 was determined. In newborn normal-weight piglets, the rate constant for FDOPA decarboxylation was markedly increased in mesostriatal regions during H/H, whereas brain oxidative metabolism remained unaltered. In contrast, moderate H/H induced in IUGR piglets a marked reduction of clearance rates for FDOPA metabolites (p < 0.05), which was accompanied by a tendency of lowering the rate constant for FDOPA conversion. Furthermore, IUGR piglets maintained cerebral O2 uptake in the early period of H/H, but during the late period of H/H, a significantly reduced cerebral metabolic rate of O2 occurred (p < 0.05). Thus, IUGR is accompanied by a missing activation of dopaminergic activity and attenuated brain oxidative metabolism during moderate H/H. This may indicate endogenous brain protection against O2 deprivation.
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Pediatric Research 57(2005)3, 363-370
DOI: 10.1203/01.PDR.0000150800.19956.F0
Cited 1 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-10092
Small-Animal PET of Rat Lung Perfusion in Supine and Prone Position
Bergmann, R.; Richter, T.; Schlesinger, J.; Schiller, E.; Ragaller, M.; Strobel, K.; Pietzsch, J.
Abstract
Emerging experimental data indicate that the pulmonary blood flow remained directed toward the dorsal regions after turning animals from a supine to a prone position. This finding supported the hypothesis that the distribution of perfusion throughout the lung was not primarily dictated by the gravity but by the fractal behavior of the pulmonary vasculature. However there are only limited data about the spatial distribution of lung perfusion in rats in prone and supine position. The purpose of the study was to quantify the relative perfusion (Q) distribution in rat lungs in both positions using [68Ga]Ga-DOTA-microspheres with small-animal PET, -CT, and -MRI to obtain reference data for further investigations on injured rat lungs.
Methods:
Regional pulmonary perfusion was investigated after injection of [68Ga]Ga-DOTA-microsphers (20 micrometer diameter) of albumin in both prone and supine positions in normal breathing rats, anesthetized with desflurane. The heart rate was continuously recorded. The right femoral artery and vein were cannulated, arterial blood pressure, blood gases, and pH were measured. The microspheres were intravenously applied. Emission data were collected for 30 min. Before and after the PET measurement the animals were studied with CT to investigate the lungs and to calculate their volumes. Randomly selected animals were studied also with smallanimal MRI. The [68Ga]-activity 3D distributions were analyzed from the coregistered volume data reconstructed with 3D OSEM MAP algorithm (resolution in the center of field of view 1.8 mm).
Results:
There were no significant differences of mean Q in the ventral and dorsal elements of normal rat lungs.
Conclusion:
The body position (prone and supine) of normal breathing rats does not influence the mean Q btained with small-animal PET and the lung volumes measured with small-animal CT. The histogram of the regional blood flow in supine position reflects a more heterogeneous blood flow distribution.
Keywords: small-animal PET; rat lung perfusion; [68Ga]Ga-DOTA-microspheres; supine and prone position
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Poster
Joint Molecular Imaging Conference 2007, 08.-11.09.2007, Providence, Rhode Island, USA
Permalink: https://www.hzdr.de/publications/Publ-10091
[18F]Fluoroacetate and [11C]Acetate Small-Animal PET Studies in Rats and Tumor Xenografts in Mice
Bergmann, R.; Richter, S.; Wüst, F.; Beuthien-Baumann, B.; Pietzsch, J.
Abstract
[18F]Fluoroacetate ([18F]FAC) is discussed as an addition to the well-established PET radiotracer [11C]acetate ([11C]ACE) for the diagnosis and treatment monitoring of low [18F]FDG accumulating cancer entities. The purpose of this study was to establish a reproducible method of [18F]FAC synthesis, and to assess the biodistribution and kinetics in rats and tumor bearing mice to evaluate the potential of [18F]FAC for tumor imaging, and to gain information about the [18F]FAC accumulation mechanism in human squamous cell carcinoma (FaDu) and adenocarcinoma (HT-29) xenografts.
Results and Discussion:
The optimized radiosynthesis of n.c.a. sodium [18F]FAC was performed in two steps: (1) Incorporation of fluorine into (methanesulfonyloxy)-acetic acid tert.-butyl ester as the superior labeling precursor in acetonitrile followed by (2) acidic hydrolysis of the resulting [18F]fluoroacetic acid tert.-butyl ester to afford [18F]FAC. Several consecutive purification gave sodium [18F]FAC in very reproducible radiochemical yields in high radiochemical purity (>95%) within 50 min. Arterial blood samples were analyzed and no metabolites of [18F]FAC were observed up to 60 min p.i. [18F]FAC was readily accumulated in FaDu and HT-29 tumors (tumor/muscle 1.8+/-0.2 mean+/-SEM, n=6) as shown in small-animal PET studies. [18F]FAC and [11C]ACE could clearly delineate the tumors and reached a tumor to muscle ratio up to two. Both agents showed a similar biodistribution. The differences were limited to the higher activity accumulation of the [11C]ACE in pancreas, spleen, kidneys, and the slower blood clearance of [18F]FAC. In some animals dehalogenation was observed.
Conclusion:
The remotely-controlled two step/one pot synthesis of [18F]FAC represents a robust and reproducible procedure. The differences of biodistribution between [18F]FAC and [11C]ACE in rats and tumor bearing mice are relatively small. The absence of metabolites in the arterial blood plasma allows using the plasma activity for quantitative kinetic studies without further metabolite analyses.
(Partly supported by the EU project BioCare No. 505785)
Keywords: small-animal PET; 18F-labeling; [18F]fluoroacetate; [11C]acetate; tumor bearing mice
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Poster
Joint Molecular Imaging Conference 2007, 08.-11.09.2007, Providence, Rhode Island, USA
Permalink: https://www.hzdr.de/publications/Publ-10090
Entwicklungen im Bereich der Nutzung von Listmode am ECAT Exact HR+ des Forschungszentrum Rossendorf
Langner, J.; Pötzsch, C.
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Invited lecture (Conferences)
Seminar Forschungzentrum Jülich, 23.08.2006, Jülich, Germany
Permalink: https://www.hzdr.de/publications/Publ-10089
Multimodality Imaging of Tumor Xenografts in Mice with dedicated Small-Animal PET, Small-Animal CT, and Small-Animal MRI: Hardware and Software Solutions
Bergmann, R.; Hauser, J.; Strobel, K.; Pötzsch, C.; Hofheinz, F.; Pietzsch, J.; Beuthien-Baumann, B.
Abstract
Dedicated small-animal tomographs are nowadays available for the three major modalities PET, MRI, and CT. Utilization of all three techniques for true multimodality imaging requires the solution of several technical problems including reproducible animal positioning, overcoming file format incompatibilities and coregistration of the different image volumes, preferably without application of markers.
Methods: We developed an isolation chamber and adapter for imaging devices, enabling physiologic animal control, reproducible positioning, pathogen barrier, anesthesia, probe application and the use of catheter systems. Furthermore, we developed the necessary software for file format conversions and coregistration of the image volumes.
The basis is the animal holder system, consisting of the fixing adapters and the animal chamber that could be positioned in our three tomographs (microPET P4, SkyScan 1178, and BioScan 70/30 USR).
The animal holder system is temperature-controled. It allows gas anesthesia of the animals and could be used as a closed system. The bed is air heated.
In the different modalities the data are stored in different formats using different image matrix and pixel sizes. In order to analyze the data they are converted to a common data format (Siemens ECAT7) and the pixel sizes are adjusted. Residual differences in the relative positioning of the animals are corrected via coregistration. We implemented a mutual information algorithm using the conjugate gradient maximization method.
Validation studies showed a good coregistration of the images from PET, CT, and MRI. In longitudinal [18F]FDG studies the coregistration allowed to compare the tumor SUVmax data between different studies.
Conclusion: Multimodality imaging of small animal PET, -CT, and MRI allows the direct comparison and quantification of regional PET, CT, and MRI/MRS parameters enabling the characterization of functional and anatomical changes during tumor development and therapy.
The project was partly supported by the EU project BioCare No. 505785.
Keywords: small-animal PET, CT, MRI; multimodality imaging; animal chamber; coregistration; mutual information algorithm
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Poster
Joint Molecular Imaging Conference 2007, 08.-11.09.2007, Providence, Rhode Island, USA
Permalink: https://www.hzdr.de/publications/Publ-10088
Cyclam-based dendritic ligands bearing neuropeptides
Röhrich, A.
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Lecture (Conference)
Supraphone meeting 2007, 31.05.-03.06.2007, Lipari, Italy
Permalink: https://www.hzdr.de/publications/Publ-10087
Neurotensin-Konjugate mit Cyclam-Kern Synthese und Affinität zu NTR-1
Röhrich, A.; Stephan, H.; Kretzschmann, A.; Noll, S.; Bergmann, R.; Pietzsch, J.; Steinbach, J.
Abstract
Dendritische Liganden eröffnen einen neuen Zugang zu Radiometallpharmaka und zwar insbesondere dann, wenn es gelingt, radioaktive Metallnuklide im Kern topologisch so zu verkapseln, dass sie unter physiologischen Bedingungen kinetisch und thermodynamisch stabil fixiert sind. Eine Modifizierung der Dendrimeroberfläche erlaubt dann die Einstellung definierter Löslichkeits- und selektiver Bindungseigenschaften.
Wir berichten über die Synthese von sternförmigen Liganden mit peripheren Peptideinheiten sowie einem metallbindenden Zentrum. Als Peptid wird das biologisch aktive Neurotensinfragment NT-(8-13) eingeführt.[1] Dieses bindet an den Neurotensin-Rezeptor 1 (NTR-1), der insbesondere an duktalen exokrinen Pankreaskarzinomen stark überexprimiert ist.[2] Als Kernbaustein wird Cyclam (1,4,8,11-Tetraazacyclotetradecan) ausgewählt, das zur stabilen Bindung von diagnostisch und therapeutisch relevanten Radiometallnukliden, wie 64/67Cu, 99mTc und 186/188Re, geeignet ist. Derartige radioaktiv markierte Peptidkonjugate können Bedeutung in der Tumordiagnostik und Tumortherapie erlangen.
Es werden Ligand-Rezeptor-Bindungs-studien an NTR-1-überexprimierenden humanen Adenokarzinom(HT-29)-Zellen präsentiert. Erste Ergebnisse weisen auf eine sehr hohe Affinität des Tetramers I sowie des entsprechenden Kupfer(II)-Komplexes zum Neurotensin-Rezeptor 1 im pico-molaren Bereich hin und ist damit vergleichbar zu einem Tetramer anderer Struktur {3]. Es werden sich Untersuchungen zur Markierung mit 64Cu anschließen, um Aussagen zur metabolischen Stabilität dieses Liganden sowie zur Bioverteilung in vivo zu erhalten.
[1] B.M. Tyler-McMahon et al., Regul. Pept. 2000, 93, 125-136
[2] J. C. Reubi, Endocr. Rev. 2003, 24, 389-427.
[3] C. Hultsch et al., Bioorg. Med. Chem. 2006, 14, 5913-5920
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Poster
Wissenschaftsforum Chemie 2007, 16.-19.09.2007, Ulm, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10086
In vivo Stoffwechseluntersuchungen mit Hilfe der Positronen-Emissions-Tomographie (PET)
Wüst, F.; Pietzsch, J.
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Invited lecture (Conferences)
Forschungsinstitut für die Biologie landwirtschaftlicher Nutztiere, 16.01.2006, Dummerstorf, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10084
Carbon-11 labelling chemistry
Wüst, F.
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Invited lecture (Conferences)
Postitron emission tomography (PET): Technology and application, 05.-07.04.2006, London, Great Britain
Permalink: https://www.hzdr.de/publications/Publ-10083
18F-Markierungen mit kleinen Markierungsbausteinen
Wüst, F.
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Invited lecture (Conferences)
Institutskolloquium, 03.08.2006, München, Germany
Permalink: https://www.hzdr.de/publications/Publ-10082
Synthesis of 18F-labeled stilbenes from 4-[18F]fluorobenzaldehyde
Wüst, F.; Gester, S.; Pietzsch, J.
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Invited lecture (Conferences)
Positron emission tomography (PET): Technology and application, 28.-30.03.2007, London, Great Britain
Permalink: https://www.hzdr.de/publications/Publ-10081
Übergangsmetallvermittelte Reaktionen mit den kurzlebigen Positronen-strahlern 11C und 18F: Neue radiochemische Methoden zur C-C und C-N Bindungsknüpfung
Wüst, F.
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Lecture (others)
Jungchemikerforum TU Dresden, 15.11.2004, Dresden, Germany
Permalink: https://www.hzdr.de/publications/Publ-10080
Characterization of PET radiotracer uptake in human leukemia cell line THP-1, a model for the study of monocyte-macrophage differentiation
Pietzsch, J.; Haase, C.
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Poster
8th World Congress on Inflammation, 16.-21.06.2007, Copenhagen, Denmark -
Abstract in refereed journal
Inflammation Research (2007)Suppl. 3, S459
Permalink: https://www.hzdr.de/publications/Publ-10079
Imaging of metabolic pathways of modified lipoproteins in vivo using small animal positron emission tomography (PET)
Pietzsch, J.; Hoppmann, S.; Haase, C.; Wüst, F.; van den Hoff, J.
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Lecture (Conference)
8th World Congress on Inflammation, 16.-21.06.2007, Copenhagen, Denmark -
Abstract in refereed journal
Inflammation Research (2007)Suppl. 3, S394
Permalink: https://www.hzdr.de/publications/Publ-10078
Lateral variation of target poisoning during reactive magnetron sputtering
Güttler, D.; Grötzschel, R.; Möller, W.
Abstract
The reactive gas incorporation into a Ti sputter target has been investigated using laterally resolving ion beam analysis during DC magnetron deposition of TiN in an Ar/N2 atmosphere. At sufficiently low reactive gas flow, the nitrogen incorporation exhibits a pronounced lateral variation, with a lower areal density in the target race track compared to the target centre and edge. The findings are reproduced by model calculations. In the race track, the balance of reactive gas injection and sputter erosion is shifted towards erosion. The injection of nitrogen is dominated by combined molecular adsorption and recoil implantation versus direct ion implantation.
Keywords: Thin Film Deposition; Magnetron Sputtering; Target Poisoning; Modelling
- Applied Physics Letters 90(2007), 263502
Permalink: https://www.hzdr.de/publications/Publ-10077
Nanostructures by Ion-Driven Self-Organisation
Möller, W.
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Lecture (others)
Seminar, 20.03.07, Aarhus, Denmark
Permalink: https://www.hzdr.de/publications/Publ-10076
Nanostructures by Ion-Driven Self-Organisation
Möller, W.
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Lecture (others)
Seminar, 02.02.2007, Caen, France
Permalink: https://www.hzdr.de/publications/Publ-10075
Oberflächen- und Schichtanalyse mit Hochenergie-Ionen
Möller, W.
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Lecture (others)
Weiterbildungskurs "Surface Engineering und Nanotechnologie (SENT), Charakterisierung dünner Schichten", 08.12.2004, Dresden, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10073
Beschichtungsplasmen
Möller, W.
-
Lecture (others)
Weiterbildungskurs "Surface Engineering und Nanotechnologie (SENT), Herstellung und Anwendung dünner Schutzschichten", 27.10.2004, Dresden, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10072
Ionenstrahltechnologien
Möller, W.
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Lecture (others)
Weiterbildungskurs "Surface Engineering und Nanotechnologie (SENT), Herstellung und Anwendung dünner Schutzschichten", 27.10.2004, Dresden, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10071
Plasma Surface Interaction and Ion Bombardment
Möller, W.
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Invited lecture (Conferences)
Tutorial "Fundamentals and Trends in Plasma Processing", Int. Konf. "Plasma Surface Engineering", 11.09.2004, Garmisch-Partenkirchen, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10070
Fundamentals of Ion Beam Analysis
Möller, W.
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Lecture (Conference)
Tutorial "Thin Film Diagnostics", EU-RTN "New Fullerene Like Materials", 04.06.2004, Dresden, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10069
Experimental hypoxia is a potent stimulus for radiotracer uptake in vitro: Comparison of different tumor cells and primary endothelial cells
Oswald, J.; Treite, F.; Haase, C.; Kampfrath, T.; Mäding, P.; Schwenzer, B.; Bergmann, R.; Pietzsch, J.
Abstract
Hypoxia causes upregulation of vascular endothelial growth factor (VEGF) which is a key regulator in tumor angiogenesis and essential for the proliferation of endothelial cells. Endothelial cells have been described to accumulate radiotracers like 18F-FDG. However, the contribution of radiotracer uptake by endothelial cells to uptake measured in tumors by positron emission tomography (PET) is still unclear. In this study 18F-FDG and 18F-FMISO radiotracer uptake in various tumor and primary endothelial cells cultured at hypoxic conditions was investigated. Experimental hypoxia was confirmed by significant upregulation of VEGF mRNA. In comparison to normoxic conditions, cellular uptake of 18F-FDG was significantly increased at hypoxic conditions in two of the tumor and all endothelial cells, whereas 18F-FMISO uptake was only enhanced in tumor cell lines HT-29 and MCF-7. Our data showed a marked influence of experimental hypoxia on the metabolism and gene expression of tumor and endothelial cells in vitro. This indicates an important contribution of endothelial cells to 18F-FDG radiotracer uptake in tumors and for the visualization of tumors by means of PET.
Keywords: Hypoxia; VEGF; Endothelial cells; Radiotracer uptake; 18F-FDG; 18F-FMISO
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Cancer Letters 254(2007), 102-110
DOI: 10.1016/j.canlet.2007.02.016
Cited 20 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-10068
Receptor for Advanced Glycation Endproducts in Health and Disease
Pietzsch, J.; (Editor)
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Book (Editorship)
Trivandrum, Kerala, India: Research Signpost, 2007
50 Seiten
Permalink: https://www.hzdr.de/publications/Publ-10067
An algebraic approach to bare nucleon matrix elements
Zschocke, S.
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Lecture (others)
Institut für Theoretische Physik, 10.12.2004, Dresden, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10066
Splitting and mixing of the ρ and ω in nuclear matter
Zschocke, S.
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Lecture (Conference)
KFKI-RMKI, 19.11.2004, Budapest, Hungary -
Invited lecture (Conferences)
FIAS, 03.12.2004, Frankfurt am Main, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10065
Mass-shift of the ρ and ω meson and their mixing in nuclear matter
Zschocke, S.
Abstract
Mass-shift of the ρ and ω meson and their mixing in nuclear matter
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Lecture (others)
Institut für Theoretische Physik, 06.06.2004, Dresden, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10064
ρ − ω splitting and mixing in nuclear matter
Zschocke, S.
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Lecture (Conference)
DPG Frühjahrstagung, 08.-12.03.2004, Köln, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10063
Radical Enhanced Atomic Layer Deposition of Tantalum Oxide
Niskanen, A.; Kreissig, U.; Leskelä, M.; Ritala, M.
Abstract
Tantalum oxide was deposited by radical enhanced atomic layer deposition using tantalum ethoxide and oxygen radicals. The radicals were produced by dissociating oxygen gas in a remote microwave plasma discharge. Argon was used as the carrier and purge gas. The films were deposited at 150 and 250°C on glass, silicon, and platinum substrates. Growth rate of the films was 0.19 nm per cycle with a 0.6 s pulse length for tantalum ethoxide and 3 s for oxygen radicals. The films were amorphous according to X-ray diffraction. The densities measured by X-ray reflectivity were between 7.1 and 7.6 g/cm3 for films grown both at 150 and 250°C. The dielectric constants were 28 and 36 for films grown on platinum electrodes at 150 and 250 °C, respectively. The leakage current densities at 1 MV/cm electric field were less than 1 x 10-8 A/cm2 for both deposition temperatures. The effect of water as an additional oxidant was studied at 250 °C. The water was supplied as a separate pulse either right before or after the tantalum ethoxide pulse.
- Chemistry of Materials 19(2007), 2316-2320
Permalink: https://www.hzdr.de/publications/Publ-10062
Photon scattering from 92Mo, 98Mo and 100Mo up to the neutron-seperation energy
Rusev, G.
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Lecture (Conference)
DPG Frühjahrstagung, 08.-12.03.2004, Köln, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10061
The ELBE Microbeam
Pawelke, J.
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Lecture (Conference)
Microbeam-Workshop, 30.-31.03.2004, Darmstadt, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10060
Feasibilty of dose quantification with in-beam PET data in radiotherapy with 12C and proton beams
Parodi, K.
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Invited lecture (Conferences)
BROWN BAG - physics seminar, 12.12.2004, Boston, USA
Permalink: https://www.hzdr.de/publications/Publ-10059
The feasibility of in-beam PET for proton therapy
Parodi, K.
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Invited lecture (Conferences)
BROWN BAG - physics seminar, 02.02.2004, Boston, USA
Permalink: https://www.hzdr.de/publications/Publ-10058
Testing of X-ray sensitive detectors at ELBE
Naumann, L.
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Lecture (Conference)
CBM Collaboration Meeting, 07.10.2004, Darmstadt, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10057
FAIR an international accelerator facility for antiproton and ion beam research in Darmstadt
Naumann, L.
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Invited lecture (Conferences)
INTAS TRD Collaboration Meeting, 01.07.2004, Gatchina, Russia
Permalink: https://www.hzdr.de/publications/Publ-10056
Structural and tribological properties of cluster-assembled CNx films
Blomqvist, M.; Bongiorno, G.; Podesta, A.; Serin, V.; Abrasonis, G.; Kreissig, U.; Möller, W.; Coronel, E.; Wachtmeister, S.; Csillag, S.; Cassina, V.; Piseri, P.; Milani, P.
Abstract
We report the structural and tribological characterization of nanostructured CNx thin films produced by the deposition of a supersonic carbon cluster beam assisted by nitrogen ion bombardment. The influence of the deposition parameters on the chemical composition and structure of the films has been systematically studied by X-ray photoelectron spectroscopy, elastic recoil detection analysis, transmission electron microscopy and atomic force microscopy. Depending on the deposition parameters, the films show a structure ranging from amorphous to disordered graphitic with interlinked planes. Nitrogen content depends on the nitrogen ion kinetic energy. The films have a very low density with a high surface roughness. Friction measurements at the nanoscale show a correlation between nitrogen content and mechanical properties of the system.
- Applied Physics A 87(2007), 767-772
Permalink: https://www.hzdr.de/publications/Publ-10055
Bi-annual Report 2005/06 - Rossendorf Beamline at ESRF (ROBL-CRG)
Scheinost, A.; von Borany, J.; (Editors)
-
Wissenschaftlich-Technische Berichte / Helmholtz-Zentrum Dresden-Rossendorf; FZD-463 2007
ISSN: 1437-322X
Downloads
Permalink: https://www.hzdr.de/publications/Publ-10054
Dileptons and charm as probes of chiral restoration
Kämpfer, B.
-
Invited lecture (Conferences)
Int. Conf. High Energy Phys., 16.-22.04.2004, Bejing, China
Permalink: https://www.hzdr.de/publications/Publ-10053
Quasiparticle model of QCD matter above and below Tc and at large μ
Kämpfer, B.
-
Lecture (Conference)
Int. Symp. The QCD phase diagramme: from theory to experiment, 28.05.-03.06.2004, Skopelos, Greece
Permalink: https://www.hzdr.de/publications/Publ-10052
Phantastische Ausblicke auf unser Universum
Kämpfer, B.
-
Lecture (others)
Urania-Seniorenakademie, 05.05.2004, Dresden, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10051
QCD equation of state above and below Tc
Kämpfer, B.
-
Lecture (Conference)
XLII Int. Winter Meeting on Nucl. Physics, 25.-31.01.2004, Bormio, Italy
Permalink: https://www.hzdr.de/publications/Publ-10050
Baryon resonances and the production of light vector mesons near thresholds
Kämpfer, B.
-
Lecture (Conference)
Internat. Workshop, 11.-17.01.2004, Hirschegg, Österreich
Permalink: https://www.hzdr.de/publications/Publ-10049
Overview of the present status of the SRF gun design and construction
Michel, P.
-
Invited lecture (Conferences)
Workshop on Advanced Free Electron Lasers and Their Applications, 24.-25.06.2004, Taiwan, China
Permalink: https://www.hzdr.de/publications/Publ-10048
Electron Beam Diagnostics at the ELBE Free Electron Laser
Michel, P.
-
Invited lecture (Conferences)
Workshop on Advanced Free Electron Lasers and Their Applications, 24.-25.06.2004, Taiwan, China
Permalink: https://www.hzdr.de/publications/Publ-10047
Design and Status of the Radiation Source ELBE and its FEL(s)
Michel, P.
-
Invited lecture (Conferences)
Workshop on Advanced Free Electron Lasers and Their Applications, 24.-25.06.2004, Taiwan, China
Permalink: https://www.hzdr.de/publications/Publ-10046
Experiments and simulation on bubbly flow in a complex 3D flow field
Lucas, D.; Prasser, H.-M.; Krepper, E.; Beyer, M.
Abstract
A new approach for the modelling of poly-dispersed bubbly flows the so-called Inhomogeneous Multi Bubble Size Group (MUSIG) model was developed jointly by FZD and ANSYS. It was implemented into the CFX code and is now available starting with code version 10. This model enables the consideration of a number bubble classes in the mass balance as well as in the momentum balance. Usually only few classes are required for the momentum balance to reflect the bubble size dependent de-mixing of small and large bubbles caused by the inversion of the sign of the lift force with increasing bubble diameter. The model was developed and first tested using data for vertical pipe flow. To show the indepen¬dency of the model on geometry and to test it for more complex flow situations, now experiments were conducted with a pronounced three-dimensional character of the flow fields. A diaphragm which blocks about one half of the pipe was placed into the vertical DN200 test sections available at the TOPFLOW facility of FZD. Main feature is the trans¬location of the diaphragm to scan the 3D void field with a stationary wire-mesh sensor. Be¬sides the measurement of time-averaged void fraction fields, a novel data evaluation method was developed to extract estimated liquid velocity profiles from the wire-mesh sensor data. Simulations were done using CFX-10 and applying the Inhomogeneous MUSIG model. In general the complex flow including a recirculation zone behind the obstacle (where bubble coalescence is observed) and a pronounced jet of high liquid velocity at the unobstructed side (were bubble break-up dominates) are reflected well in the simulations. There is a strong interaction between size dependent bubble migration in the complex liquid velocity field (mainly caused by the lift force) and local bubble coalescence and break-up. The data clearly demonstrate the necessity to consider the bubble size dependent bubble migration for an adequate simulation of bubbly flows in complex geometries. Some weaknesses of the simulations are connected with shortcomings in the modelling of bubble coalescence and break-up.
Keywords: bubbly flow; 3D; flow field; CFD
-
Lecture (Conference)
45th European Two-Phase Flow Group Meeting, 22.-25.05.2007, Toulouse, France
Permalink: https://www.hzdr.de/publications/Publ-10045
Stability effect of the lateral lift force in bubbly flows
Lucas, D.; Krepper, E.; Prasser, H.-M.; Manera, A.
Abstract
The role of the lift force for the stability of bubbly flows is discussed. The main interest is directed towards bubble columns, since instabilities caused by the lift force may be one important reason for the transition from homogeneous to heterogeneous flow regimes. The lift force acts on rising bubbles in lateral direction, when gradients of the liquid velocity are present. Such gradients may result from the main liquid flow or from local disturbances in case of initially homogeneous flows. Depending on the sign of the lift force such local disturbances in a homogeneous flow may be damped or enhanced. The corresponding feedback mechanism was previously analysed by means of a linear stability analyses. In the result criteria for stability were obtained for mono-dispersed flow, for a flow with two bubble size groups and finally with some additional approximations also for the case of N bubble size groups or a given bubble size distribution. Recently two different groups confirmed the stability criteria experimentally. Now the effects were investigated also by means of CFD simulations. In a first step bubble coalescence was excluded, while the second step comprises a numerical study which includes coalescence. In the latter case coalescence leads to a transition from stable to instable flow patterns along the height position in the column. The transitions fit well together with the criteria for stability. Finally the influence of the lift force is discussed also for other flow situations.
Keywords: bubbly flow; stability; bubble column; lift force
-
Contribution to proceedings
International Conference on Multiphase Flow - ICMF 2007, 09.-13.07.2007, Leipzig, Germany
paper S1_Mon_C_9 -
Lecture (Conference)
International Conference on Multiphase Flow - ICMF 2007, 09.-13.07.2007, Leipzig, Germany
Permalink: https://www.hzdr.de/publications/Publ-10044
Spontaneous symmetry breaking and rotational bands
Frauendorf, S.
-
Invited lecture (Conferences)
Fall meeting of the Div. of Nucl. Phys. of the American Physical Society, 02.10.2004, Chicago, USA
Permalink: https://www.hzdr.de/publications/Publ-10043
Normal persistent currents and gross shell structure at high spin
Frauendorf, S.
-
Lecture (Conference)
Workshop on mesoscopic physics, 01.10.2004, Michigan, USA
Permalink: https://www.hzdr.de/publications/Publ-10042
Probing shape coexistence by dipole excitations
Frauendorf, S.
-
Lecture (others)
Forschungszentrum Rossendorf, 01.07.2004, Dresden, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10041
Experimental evidence for chirality
Frauendorf, S.
-
Lecture (others)
Niels Bohr Institute, University of Copenhagen, 02.06.2004, Copenhagen, Danmark
Permalink: https://www.hzdr.de/publications/Publ-10040
Symmetries of the cranked mean field
Frauendorf, S.
-
Invited lecture (Conferences)
International Nuclear Physics Conference, 07.06.2004, Goeteborg, Sweden -
Invited lecture (Conferences)
Niels Bohr Institute, 01.06.2004, Copenhagen, Danmark
Permalink: https://www.hzdr.de/publications/Publ-10039
Tilted rotation
Frauendorf, S.
-
Lecture (others)
Bejing University, 03.04.2004, Bejing, China
Permalink: https://www.hzdr.de/publications/Publ-10038
Nuclear tidal waves
Frauendorf, S.
-
Lecture (others)
Bejing University, 02.04.2004, Bejing, China
Permalink: https://www.hzdr.de/publications/Publ-10037
Exotic phenomena at high spin
Frauendorf, S.
-
Lecture (Conference)
Workshop on AGATA physics, 01.03.2004, Orsay, France
Permalink: https://www.hzdr.de/publications/Publ-10036
Topology of conformational changes in photoreceptor activation
Fahmy, K.
-
Lecture (others)
Universität Frankfurt am Main, 20.12.2004, Frankfurt am Main, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10035
Metallisierung von Proteinen: Wege zu neuen Materialien
Fahmy, K.
-
Lecture (Conference)
Bruker-Anwendertreffen, 11.11.2004, Ettlingen, Dtl.
Permalink: https://www.hzdr.de/publications/Publ-10034
Proteinstruktur und Funktion: Ein Infrarot-Blick auf Membranproteine
Fahmy, K.
-
Lecture (Conference)
ISAS, 05.05.2004, Berlin, Dtl.
Permalink: https://www.hzdr.de/publications/Publ-10033
Tomographische Rekonstruktion beim in-beam PET Monitoring der Schwerionentherapie
Enghardt, W.
-
Invited lecture (Conferences)
DKFZ, 21.01.2004, Heidelberg, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10032
Testing novel time of flight detectors at ELBE: Overview
Dohrmann, F.
-
Lecture (Conference)
HADES Collaboration Meeting, 30.10.2004, Darmstadt, Dtl.
Permalink: https://www.hzdr.de/publications/Publ-10030
Testing novel time of flight detectors at ELBE: Status report
Dohrmann, F.
-
Lecture (Conference)
CBM Collaboration Meeting, 07.10.2004, Darmstadt, Dtl.
Permalink: https://www.hzdr.de/publications/Publ-10029
Electroproduction of 3,4H-λ states on Helium
Dohrmann, F.
-
Lecture (Conference)
19th European Conference on FEW-Body Problems in Physics, 23.08.2004, Groningen, Netherlands
Permalink: https://www.hzdr.de/publications/Publ-10028
Die besondere Rolle der seltsamen Quarks in Kernen und Kernmaterie
Dohrmann, F.
-
Lecture (others)
Physikalisches Kolloquium der Technischen Universität Dresden, 22.06.2004, Dresden, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10027
Productions of antikaons in p+Au and p+C collisions
Dohrmann, F.
-
Lecture (Conference)
DPG Frühjahrstagung, 10.03.2004, Köln, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10026
Testing new time of flight detectors at ELBE: Status report
Dohrmann, F.
-
Lecture (Conference)
CBM Collaboration Meeting, 13.02.2004, Darmstadt, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10025
In-beam PET for hadron therapy using LSO/APD-array detectors
Crespo, P.
-
Lecture (Conference)
41th General (Open) Meeting of the Crystal Clear Collaboration, CERN, 29.09.2004, Geneva, Switzerland
Permalink: https://www.hzdr.de/publications/Publ-10024
In-situ monitoring with PET: Suppression of random coincidences during in-beam PET measurements
Crespo, P.
-
Lecture (Conference)
ENLIGHT Workpackage 5, 06.06.2004, Paris, France
Permalink: https://www.hzdr.de/publications/Publ-10023
Quasi-particle model for deconfined matter
Bluhm, M.
-
Lecture (Conference)
Strangness in Quark Matter 2004, 15.-20.09.2004, Cape Town, South Africa
Permalink: https://www.hzdr.de/publications/Publ-10022
BUU calculations for K+, K− and φ production for proton-nucleus collisions in the GeV region
Barz, H. W.
-
Invited lecture (Conferences)
International Workshop on Hot and Dense Matter in Relativistic Heavy-Ion Collisions, 24.-27.03.2004, Budapest, Ungarn
Permalink: https://www.hzdr.de/publications/Publ-10021
Contribution of the nucleon-hyperon reaction channels to K− production in proton-nucleus collisions
Barz, H. W.
-
Lecture (Conference)
DPG Frühjahrstagung, 08.-12.03.2004, Köln, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10020
Experimental evidence for chirality in the odd-A Rh-105
Timar, J.; Joshi, P.; Starosta, K.; Dimitrov, V.; Fossan, D.; Molnar, J.; Sohler, D.; Wadsworth, R.; Algora, A.; Bednarczyk, P.; Curien, D.; Dombradi, Z.; Duchene, G.; Gizon, A.; Gizon, J.; Jenkins, D.; Koike, T.; Krasznahorkay, A.; Paul, E.; Raddon, P.; Rainovski, G.; Scheurer, J.; Simons, A.; Vaman, C.; Wilkinson, A.; Zolnai, L.; Frauendorf, S.
Abstract
High-spin states in Rh-105 were populated by the Zr-96(C-13,p3n) reaction at beam energies of 51 and 58 MeV, and studied using the EUROBALL IV gamma-ray spectrometer and the DIAMANT charged particle array. A pair of nearly degenerate DeltaI = 1 three-quasiparticle bands with the same spins and parity have been observed. Comparison of the experimental results with tilted axis cranking calculations confirms the chiral character of the two bands, while arguments based on the excitation of particles within the pig(9/2)nu(h(11/2))(2) configuration of the yrast band and comparison with the previously observed gamma band exclude the other possible interpretations. This is the first experimental evidence for three-quasiparticle chiral structure in the A similar to 100 region, and the first simultaneous observation of a gamma band and chiral partner bands in one nucleus. (C) 2004 Elsevier B.V. All rights reserved.
- Physics Letters B 598(2004), 178-187
Permalink: https://www.hzdr.de/publications/Publ-10019
Comment on "Electromagnetic dissociation of B-8 and the astrophysical S factor for Be-7(p,gamma)B-8"
Snover, K.; Junghans, A.; Mohrmann, E.
Abstract
Recently, Davids and Typel recommended a "low" value of S-17(0) based on fits to published direct and Coulomb dissociation data, in which they excluded the precise result of Junghans We show that their statistical analysis is incorrect due to a substantial underestimate of the experimental uncertainties, and that there is no reason to exclude the Junghans result based on statistical arguments.
- Physical Review C 70(2004), 39801
Permalink: https://www.hzdr.de/publications/Publ-10018
Chiral bands in Rh-105
Alcantara-Nunez, J.; Oliveira, J.; Cybulska, E.; Medina, N.; Rao, M.; Ribas, R.; Rizzutto, M.; Seale, W.; Falla-Sotelo, F.; Wiedemann, K.; Dimitrov, V.; Frauendorf, S.
Abstract
The Rh-105 nucleus has been studied by in-beam gamma spectroscopy with the heavy-ion fusion-evaporation reaction Mo-100(B-11, alpha2ngamma) at 43 MeV A rich variety of structures was observed at high and low spin, using gamma - gamma - t and gamma - gamma - particle coincidences and directional correlation ratios. Four magnetic dipole bands have also been observed at high spin. Two of them are nearly degenerate in excitation energy and could be chiral partners, as predicted by Tilted Axis Cranking calculations.
- Brazilian Journal of Physics 34(2004), 999
Permalink: https://www.hzdr.de/publications/Publ-10017
Magnetic dipole and electric quadrupole rotational structures and chirality in Rh-105
Alcantara-Nunez, J.; Oliveira, J.; Cybulska, E.; Medina, N.; Rao, M.; Ribas, R.; Rizzutto, M.; Seale, W.; Falla-Sotelo, F.; Wiedemann, K.; Dimitrov, V.; Frauendorf, S.
Abstract
The Rh-105 nucleus has been studied with the Mo-100(B-11, alpha2ngamma) reaction at 43 MeV incident energy. A rich variety of structures was observed at high and low spins, using gamma-gamma-t and gamma-gamma-particle coincidences and directional correlation ratios. A gamma-vibrational band was observed for the first time in this nucleus. A new structure based on the intruder 1/2(+)[431] proton orbital was identified. Four magnetic dipole bands have also been observed at high spin, three of which have negative parity and have similar characteristics: they are very regular in energy spacing, presenting nearly constant alignments and large values of B(M1)/B(E2) ratios. Two of them are nearly degenerate in excitation energy and could be chiral partners. The pig(9/2)xnuh(11/2)(g(7/2),d(5/2)) configuration is tentatively assigned for these bands, with the angular momenta of the proton and neutron intruders and the collective angular momentum aligning along the three perpendicular axes of the triaxial core, as predicted by tilted axis cranking calculations.
- Physical Review C 69(2004), 024317
Permalink: https://www.hzdr.de/publications/Publ-10016
Vortex structures in the separated flow on an inclined flat plate under electromagnetic forcing: influences of excitation wave form, frequency, and amplitude
Weier, T.; Cierpka, C.; Gerbeth, G.
Abstract
Wall parallel Lorentz forces have been used to excite the separated flow on the suction side of inclined symmetric hydrofoils. Resulting lift enhancements resemble those known from alternative active flow control methods. The controlled flow is characterized by a small number of relatively large vortices, which are related to the control mechanism. Consequently, time resolved flow fields have been analyzed by proper orthogonal decomposition and continuous wavelet transform to extract dominant features. Both evaluation methods highlight significant influences of excitation frequency, wave form, and amplitude.
Keywords: Proper Orthogonal Decomposition; Continuous Wavelet Analysis; Coherent Structures; Flow Control; Lorentz force
-
Lecture (Conference)
5th International Symposium on Turbulence and Shear Flow Phenomena, 27.-29.08.2007, München, Germany -
Contribution to proceedings
5th International Symposium on Turbulence and Shear Flow Phenomena, 27.-29.08.2007, München, Germany
Proceedings of the 5th International Symposium on Turbulence and Shear Flow Phenomena, 1105-1110
Permalink: https://www.hzdr.de/publications/Publ-10015
In-Medium Properties of Omega.Meson and Nucleon: QCD Sum Rules Approach and Rule of Four-Quark Condensates
Thomas, R.
-
Invited lecture (Conferences)
Virtual Institute Workshop III, 16.10.2006, Rathen, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10014
In-Medium Change of Four-Quark Condensates: QCD Sum Rules Evaluation for Omega-Meson and Nucleon
Thomas, R.
-
Lecture (Conference)
44. Int. Universitätswochen für Theoretische Physik, 12.03.2006, Schladming, Dtl. -
Lecture (Conference)
Frühjahrstagung der Deutschen Physikalischen Gesellschaft, 22.03.2006, München, Dtl.
Permalink: https://www.hzdr.de/publications/Publ-10013
Omega, Nucleon, D Spectroscopy: QCD Sum Rules in Vakuum and Nuclear Matter
Thomas, R.
-
Lecture (Conference)
37. Arbeitstreffen "Kernphysik", 08.03.2006, Schleching, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10012
FEL-induced Reflectivity changes in thin DNA-Films
Sczepan, M.
-
Lecture (others)
Institut für neue Materialien, 12.06.2006, Saarbrücken, Dtl.
Permalink: https://www.hzdr.de/publications/Publ-10011
Electromagnetic excitations in nuclei: from photon scattering to photodisintegration
Schwengner, R.
-
Lecture (Conference)
Frühjahrstagung der Deutschen Physikalischen Gesellschaft, 20.-24.03.2006, München, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10010
Quenching of electroluminescence and charge trapping in high-efficiency Ge-implanted MOS light-emitting silicon diodes
Nazarov, A.; Osiyuk, I.; Sun, J.; Yankov, R.; Skorupa, W.; Tyagulskii, I.; Lysenko, V.; Prucnal, S.; Gebel, T.; Rebohle, L.
Abstract
Combined measurements of charge trapping and electroluminescence intensity as a function of injected charge and current have been carried out with the aim of clarifying the mechanisms of electroluminescence (EL) quenching in Ge-implanted ITO-SiO2-Si light-emitting silicon diodes. Good correlation between the negative charge capture in traps of small effective capture cross-sections (sigmat1 e=1.7x10-19 cm2 and sigmat2 e=4.8x10-20 cm2) located in SiO2, and the quenching of the asymmetrical EL line with a maximum intensity at 400 nm has been observed. Similar correlation between the electron capture in traps with extremely small effective capture cross-section (sigmat3 e=5x10-21 cm2) and the quenching of the EL line at 637 nm has been established. A quantitative model for the EL quenching has been developed, which takes into account the modification of the luminescent centers with subsequent electron capture at the newly generated trap! s. The model shows good agreement between simulation and experimental data. It also demonstrates that small effective capture cross-sections for electron charging during the EL quenching are determined by the probability of the luminescence centers (LCs) being disrupted, and enables one to estimate the Ge concentration associated with the EL at 400 nm.
Keywords: Silicon-based light emitter; ion implantation; rare earths; electroluminescence; Metal-Oxide-Silicon-based Light Emitting Diodes (MOSLEDs); hot electron injection; charge trapping
-
Applied Physics B 87(2007), 129-134
DOI: 10.1007/s00340-006-2534-1
ISSN: 0946-2171
Cited 14 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-10009
Dipole-strength distributions below the giant dipole resonance in 92Mo, 98Mo and 100Mo
Rusev, G.
-
Lecture (others)
Institut für Kern- und Teilchenphysik, 19.10.2006, Dresden, Deutschland -
Wissenschaftlich-Technische Berichte / Helmholtz-Zentrum Dresden-Rossendorf; FZD-478 2007
ISSN: 1437-322X
Downloads
Permalink: https://www.hzdr.de/publications/Publ-10008
Phi-Mesons in C+C collisions at 2 AGeV
Kotte, R.
-
Lecture (Conference)
Hades collaboration meeting, 25.-28.10.2006, Darmstadt, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10007
Quasi-particle perspective on critical end point
Kämpfer, B.
-
Invited lecture (Conferences)
Critical point and onset of deconfinement, 02.-09.07.2006, Florence, Italy
Permalink: https://www.hzdr.de/publications/Publ-10006
Our interest on omega mesons
Kämpfer, B.
-
Lecture (Conference)
OMEGA-Workshop, 19.-20.10.2006, Dresden, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10005
Interpretation of HADES data
Kämpfer, B.
-
Lecture (Conference)
Virtual Institute (III): Dense Hadronic Matter and QCD Phase Transitions, 15.-17.10.2006, Rathen, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10004
Dense and hot strongly interacting matter on the universe
Kämpfer, B.
-
Lecture (Conference)
Seminar on IST, 12.09.2006, Lissabon, Portugal -
Lecture (others)
Seminar FSU Jena, 01.06.2006, Jena, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-10003
Quasi-particle perspective on equation of state and critical end point
Kämpfer, B.
-
Lecture (Conference)
Quark Confinement and the Hadron Spectrum VII, 02.-07.09.2006, Ponta Delgado, Portugal
Permalink: https://www.hzdr.de/publications/Publ-10002
Impact of 4-quark condensates on in-medium effects of hadrons
Kämpfer, B.
-
Lecture (Conference)
Quark Confinement and the Hadron Spectrum VII, 02.-07.09.2006, Ponta Delgado, Portugal
Permalink: https://www.hzdr.de/publications/Publ-10001
Heavy ion reactions at ultrarelativistic energies from hot deconfined matter to hadronic freeze-out
Kämpfer, B.
-
Lecture (Conference)
ECT* Workshop, 26.06.-21.07.2006, Trento, Italy
Permalink: https://www.hzdr.de/publications/Publ-10000
On the effect of discretization in HELIOS 1.9
Merk, B.; Koch, R.
Abstract
Study on the discretization effects in HELIOS 1.9 on teh basis of a single cell calculation
Keywords: Neutronics; HELIOS; Discretization; Neutronflux
-
Lecture (others)
Studsvik 2007 UGM, 31.05.-01.06.2007, West Palm Beach, United States
Permalink: https://www.hzdr.de/publications/Publ-9999
Physics of high baryon density, Presentation of the chapter "In-medium modifications of hadrons"
Kämpfer, B.
-
Lecture (Conference)
ECT* Workshop, 05.05.-02.06.2006, Trento, Italy
Permalink: https://www.hzdr.de/publications/Publ-9998
Quasi-particle model of QCD matter and a family of equations of state
Kämpfer, B.
-
Lecture (Conference)
ECT* Workshop, 21.-25.03.2006, Trento, Italy
Permalink: https://www.hzdr.de/publications/Publ-9997
Exclusive virtual bremsstrahlung
Kämpfer, B.
-
Lecture (Conference)
HADES-Meeting, 04.-08.04.2006, Dresden, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-9996
Medium modifications of hadrons: chiral condensate and more
Kämpfer, B.
-
Lecture (Conference)
HADES-Meeting, 04.-08.04.2006, Dresden, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-9995
Electromagnetic probes of strongly interacting matter
Kämpfer, B.
-
Lecture (Conference)
HADES-Meeting, 04.-08.04.2006, Dresden, Deutschland -
Lecture (Conference)
Workshop on In-Medium Hadron Physics, 11.11.2004, Gießen, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-9994
D mesons and the chiral condensate
Kämpfer, B.
-
Invited lecture (Conferences)
PANDA-Meeting, 20.06.2006, Dresden, Deutschland
Permalink: https://www.hzdr.de/publications/Publ-9993
Pulsed ion-beam induced nucleation and growth of Ge nanocrystals on SiO2
Stepina, N. P.; Dvurechenskii, A. V.; Armbrister, V. A.; Kesler, V. G.; Novikov, P. L.; Gutakovskii, A. K.; Kirienko, V. V.; Smagina, Z. V.; Groetzschel, R.
Abstract
Pulsed low-energy (200 eV) ion-beam induced nucleation during Ge deposition on thin SiO2 film was used to form dense homogeneous arrays of Ge nanocrystals. The ion-beam action is shown to stimulate the nucleation of Ge nanocrystals when being applied after thin Ge layer deposition. Temperature and flux variation was used to optimize the nanocrystal size and array density required for memory device. Kinetic Monte Carlo simulation shows that ion impacts open an additional channel of atom displacement from a nanocrystal onto SiO2 surface. This results both in a decrease in the average nanocrystal size and in an increase in nanocrystal density.
- Applied Physics Letters 90(2007)13, 33120
Permalink: https://www.hzdr.de/publications/Publ-9992
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