33 results on '"S. Petzoldt"'
Search Results
2. Maligne atrophische Papulose
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S. Petzoldt, B. Schwarz, Matthias Pross, and Maik Sahm
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medicine.medical_specialty ,medicine.diagnostic_test ,business.industry ,medicine ,Surgery ,Laparoscopy ,business ,Dermatology ,Malignant Atrophic Papulosis - Published
- 2011
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3. Computed tomographic evaluation of the distal aspect of the deep digital flexor tendon (DDFT) in horses
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S Tietje, S Petzoldt, H Weiler, and M Nowack
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Flexor tendon ,Equine ,business.industry ,Medicine ,Anatomy ,business ,Computed tomographic - Published
- 2001
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4. Laser plasma threshold of metals
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Juergen Reif, Eckart Matthias, and S. Petzoldt
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Range (particle radiation) ,Dielectric strength ,business.industry ,Evaporation ,General Physics and Astronomy ,chemistry.chemical_element ,Surfaces and Interfaces ,General Chemistry ,Plasma ,Condensed Matter Physics ,Laser ,Surfaces, Coatings and Films ,law.invention ,Boiling point ,Optics ,chemistry ,law ,Thermal ,Optoelectronics ,business ,Titanium - Abstract
For nanosecond laser pulses, thermal properties have a decisive influence on laser plasma thresholds of metals. The acoustic mirage effect technique allows quantitative investigations over a wide range of incident laser intensities, from subthreshold heating to dense plasma generation. Under particular consideration of copper and titanium targets, with strongly different thermal conductivities, we show that two threshold conditions must be fulfilled concurrently: the metal surface must be heated to the boiling point to provide metal vapor and the laser intensity has to be high enough to enable dielectric breakdown in the vapor. Even at very high fluences, where a dense plasma is created, thermal properties are of importance. Since part of the incident energy is consumed for evaporation, only the excess energy can heat the plasma.
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- 1996
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5. In-situ investigation of laser ablation of thin films
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Eckart Matthias, E. Neske, H. Skurk, Michael Reichling, O. W. Käding, Jan Siegel, and S. Petzoldt
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Laser ablation ,Materials science ,business.industry ,medicine.medical_treatment ,Metals and Alloys ,Evaporation ,Surfaces and Interfaces ,Acoustic wave ,Laser ,Ablation ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,law.invention ,Wavelength ,Optics ,Optical coating ,law ,Materials Chemistry ,medicine ,Optoelectronics ,Thin film ,business - Abstract
The probe beam deflection technique, based on the mirage effect, has been applied to monitor laser processing of polymer and metal films and to measure damage thresholds of optical coatings. The technique is described and it will be shown that its sensitivity permits distinguishing between surface effects like heating and cracking, causing normal sound waves, and plasma formation outside the surface, giving rise to shockwaves. Examples are presented for single-shot ablation with 14 ns laser pulses of 248 nm wavelength. In particular, ablation studies of Ni films of varying thicknesses disclose a quantitative correlation between threshold fluences and thermal properties like heat diffusion, melting, and evaporation. In contrast, for Cr films a simple thermodynamic model fails because the films crack before melting and vaporizing.
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- 1995
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6. [Malignant atrophic papulosis as an incidental finding on laparoscopy--case report]
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S, Petzoldt, B, Schwarz, M, Sahm, and M, Pross
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Adult ,Male ,Incidental Findings ,Biopsy ,Muscle, Smooth, Vascular ,Abdominal Pain ,Diagnosis, Differential ,Malignant Atrophic Papulosis ,Ileum ,Ischemia ,Appendectomy ,Humans ,Laparoscopy ,Mesentery ,Omentum ,Skin - Published
- 2011
7. Contents, Vol. 98, 1992
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Bruno L. Diaz, Jiajia Liu, Marco A. Martins, Akihide Koda, Terry F. Davies, N. Ishikawa, Cheryl R. Robertson, Tokugoro Tsunematsu, Noriko Yamagata, C.H.L. Rieger, S. Romagnani, Masao Negishi, Hironori Kimura, W. König, Marcia C.R. Lima, Leonard D. Shultz, Hiroo Yokozeki, D.W. Fountain, Patrícia M.R. e Silva, U. Stephan, Shyam S. Mohapatra, Nishioka K, Hidekazu Fujimaki, Takashi Katsura, Y. Horii, R.A. Hilger, B. Berggren, J.H. Skerritt, Jacek Rożniecki, Hideaki Iwabuchi, F. Riedel, Kazuo Kobayashi, Shinji Souma, Jun-ichi Tsuji, Ivan Correia, Masayoshi Abe, Efyse Bissonnette, Akihiko Watanabe, Yasutake Yanagiham, K. Neuber, Swan Thung, William Boucher, Terumi Takahashi, Theoharis C. Theoharides, David S. Pisetsky, J. Rüschoff, Y. Yanagihara, Kai R. Dietz, S. Petzoldt, S. Nilsson, Renato S.B. Cordeiro, Tsuyoshi Sakane, Alessandra C. Alves, J.D. Mitchell, J. Gonczi, Po Fong, Helmut H. Wolff, S. Raam, Dean Befus, Tom Imai, Wolfgang Holter, A. Martin, Yoshihisa Iwamoto, Takanari Tominaga, Akiko Kawagoe, Sachiko Sugihara, V. Dimitriadou, Kiyoko Tanaka, S. Naujukat, Toshiyuki Masuzawa, Harissios Vliagoftis, Egil Olsen, Y. Nawa, R. Einarsson, Hirotsugu Ide, Franz W. Bauer, Esther von Stebut, Nobuaki Shigematsu, Ulrich Amon, Yoshiaki Mori, Ichiro Katayama, Tadayori Shimizu, Naoki Nagakura, and Kazue Yoshida
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business.industry ,Immunology ,Immunology and Allergy ,Medicine ,General Medicine ,business - Published
- 1992
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8. Multishot ablation of polymer and metal films at 248 nm
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S. Petzoldt, Eckart Matthias, E. Hunger, and H. Pietsch
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Shock wave ,Materials science ,medicine.medical_treatment ,General Physics and Astronomy ,Photoresist ,Radiation ,law.invention ,Metal ,Optics ,law ,medicine ,Thin film ,chemistry.chemical_classification ,business.industry ,Surfaces and Interfaces ,General Chemistry ,Polymer ,Condensed Matter Physics ,Laser ,Ablation ,Surfaces, Coatings and Films ,chemistry ,visual_art ,visual_art.visual_art_medium ,Optoelectronics ,business - Abstract
The photoacoustic mirage effect technique was utilized to investigate excimer laser ablation of thin polymer (photoresist) and metal films. Layered systems, consisting of a photoresist-metal-SiO 2 structure, were ablated by KrF (λ = 248 nm) laser radiation at fluences up to 2 J/cm 2 . For the photoresist layer a linear dependence of the deflection amplitude on the etch rate was found in the low fluence regime (≤ 0.7 J/cm 2 ). Significant changes in the deflection signal occured when the ablation passed the interface between subsequent layers. This effect can be used to distinguish between different layers. Therefore, shock wave monitoring in principle offers the possibility for an in situ control of laser thin film processing. Selective ablation of metal films from the SiO 2 layer is limited to fluences below 2 J/cm 2 .
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- 1992
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9. SO2-Induced Enhancement of Inhalative Allergic Sensitization Inhibition by Anti-Inflammatory Treatment
- Author
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Frank Riedel, S. Petzoldt, J. Rüschoff, Christian H.L. Rieger, and S. Naujukat
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Allergy ,Inhalation ,biology ,business.industry ,Immunology ,General Medicine ,medicine.disease ,respiratory tract diseases ,Guinea pig ,Allergic sensitization ,Ovalbumin ,medicine.anatomical_structure ,Methylprednisolone ,biology.protein ,Immunology and Allergy ,Medicine ,Nedocromil Sodium ,business ,Sensitization ,medicine.drug - Abstract
Epidemiological studies have shown a relationship between air pollution and allergic airway disease. In a previous study we have found that exposure to SO2 enhances allergic sensitization to inhaled ovalbumin (OA) in the guinea pig. We have now investigated the influence of pre-treatment with anti-inflammatory drugs on SO2-induced enhancement of allergic sensitization in this model. Four groups of 6 guinea pigs each were exposed to 5 ppm SO2 on 5 consecutive days over 8 h per day with intermittent inhalation of OA, while the air-control group was exposed to clean air and OA. During the period of SO2 exposure and sensitization three experimental groups were treated with indomethacin (group I), methylprednisolone (group M) and nebulized nedocromil sodium (group N), while the control group remained untreated. Guinea pigs were investigated for sensitization to OA by specific bronchial provocation tests using body plethysmographic measurement of compressed air (CA) and by measurement of specific antibody response in serum. While in the SO2-exposed control group 5 of 6 animals reacted to specific bronchial provocation testing (CA median 0.15 ml, range 0-0.175 ml), only 1 animal was sensitized in group M (CA 0 ml, 0–0.125, p 2 exposure inhibits SO2-induced enhancement of inhalative allergic sensitization in our guinea pig model.
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- 1992
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10. Multishot Ablation of Thin Films: Sensitive Detection of Film/Substrate Transition by Shockwave Monitoring
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E Hunger, S Petzoldt, H Pietsch, J Reif, and E Matthias
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- 2009
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11. Shockwave Detection, An Efficient Way to Determine Multiple-Pulse Damage Thresholds
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J. Reif, Eckart Matthias, A. P. Elg, and S. Petzoldt
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Materials science ,business.industry ,chemistry.chemical_element ,Copper ,Molecular physics ,Fluence ,Optics ,chemistry ,Energy absorption ,Deflection (engineering) ,Aluminium ,Multiple pulse ,business ,Laser beams - Abstract
The detection of damage associated shock pulses via the deflection of a probe laser beam is exploited to study multiple-shot damage thresholds in CaF,, PMMA, copper, and aluminium. We find a reduction of threshold intensity as compared to single-shot conditions. The experimental results point towards deviations from the previously postulated fluence dependence F N = F 1 N S - 1 [see Ref.4]. They are, however, compatible with a simple model relating the threshold reduction to defect accumulation via non-linear energy absorption.
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- 2009
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12. Multiphoton Absorption Near Surface Damage Thresholds of Ionic Crystals and Metals
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J. Reif, Eckart Matthias, PJ West, S. Petzoldt, and A. P. Elg
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Materials science ,Analytical chemistry ,Ionic crystal ,Absorption (electromagnetic radiation) - Published
- 2009
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13. Elevated neonatal salivary anti-casein immunoglobulin A antibodies as an indicator of atopic risk
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C. Brehler, Harald Renz, C. H. L. Rieger, H. Prinz, S. Petzoldt, A. Banzhoff, A. Eckhart, and U. Schauer
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Immunoglobulin A ,medicine.medical_specialty ,Allergy ,biology ,business.industry ,Immunology ,Disease ,medicine.disease ,Immunoglobulin E ,Titer ,Internal medicine ,Cord blood ,Pediatrics, Perinatology and Child Health ,medicine ,biology.protein ,Immunology and Allergy ,Family history ,Antibody ,business - Abstract
Elevation of salivary SIgA-anti-casein has been shown to occur in newborn infants at risk of allergy. The present study was designed to follow 158 infants over 3 years to relate the onset of clinical disease to SIgA levels at birth. Newborn infants were divided into 3 groups according to their risk of allergy: Group I, (n= 62; no allergy risk); Group II, (n -30; low allergy risk); Group III (n= 66; high risk group). The groups were matched for smoking, social background, sex, and dietary habits of the patients. SIgA-anti-casein was determined by a direct ELIS A. During the first year 59 infants developed atopic diseases (n= 37 of Groups I and II; n= 22 of Group III). After 3 years 37/61 infants of the high risk group had developed allergic symptoms. The frequency of atopic disease correlated with increased salivary antibody titers at birth (p 250 EU/ml developed atopic symptoms at 1 year, 76% high risk infants with this titer developed atopic symptoms at 3 years of age. This study provides evidence that elevation of SIgA-anti-casein at birth not only reflects atopic risk as defined by cord blood IgE or family history, but correlates with the actual development of allergic disease during the first 3 years of life.
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- 1991
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14. Elevated Concentrations of Salivary Secretory Immunoglobulin A Anti-Cow’s Milk Protein in Newborns at Risk of Allergy
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Christian H.L. Rieger, S. Petzoldt, C. Brehler, H. Renz, H. Prinz, and R. Vestner
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Saliva ,Allergy ,medicine.medical_specialty ,Immunology ,Enzyme-Linked Immunosorbent Assay ,Lactoglobulins ,Breast milk ,Immunoglobulin E ,Internal medicine ,Casein ,Humans ,Immunology and Allergy ,Medicine ,Risk factor ,Beta-lactoglobulin ,Milk, Human ,biology ,business.industry ,Infant, Newborn ,Caseins ,General Medicine ,Milk Proteins ,medicine.disease ,Endocrinology ,Immunoglobulin G ,Immunoglobulin A, Secretory ,biology.protein ,Milk Hypersensitivity ,Antibody ,business - Abstract
Secretory immunoglobulin A (SIgA) anti-casein and SIgA anti-beta-lactoglobulin (BLG) were determined in the saliva of 158 healthy mature infants at birth and in breast milk samples using a direct Elisa technique. IgG anti-casein and anti-BLG were measured in serum samples from mothers and newborns (cord blood). A high risk of allergy was defined in 66 infants who had cord blood (CB)-IgE levels greater than or equal to 0.9 IU/ml and/or parents with atopic diseases. Thirty infants had CB levels less than 0.9 IU/ml and parents without clinical symptoms of atopy but with elevated serum IgE concentrations or type I skin reactions to common allergens (low risk). Sixty-two infants had CB-IgE levels less than 0.9 IU/ml and healthy parents (no risk). The groups were matched for social status, smoking and dietary habits. SIgA anti-casein and anti-BLG were detected in all newborns. SIgA anti-casein was significantly higher (p less than 0.05) in high risk infants (medium 157; 50% confidence limits 45-270) than in no risk (48; 25-150) or low risk infants (43; 21-130). SIgA anti-casein values correlated with maternal allergy, maternal allergy plus CB-IgE, but not with paternal allergy. Breast milk SIgA anti-BLG was depressed (p less than 0.05) in mothers with manifest allergy compared to healthy mothers. Determination of salivary SIgA anti-casein may represent an additional screening method for early detection of infants with atopic disposition.
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- 1990
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15. Wirksamkeit einer stationären neurologischen Schmerzrehabilitation. Erste Ergebnisse einer kontrollierten randomisierten prospektiven Untersuchung
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H. Basler, F. Welter, S. Petzoldt, C. Berwanger, and S. Oester
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Neurology (clinical) - Published
- 2007
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16. Laser plasma threshold of metals
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S. Petzoldt, J. Reif, and E. Matthias
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- 1996
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17. Salivary anti-RSV IgA antibodies and respiratory infections during the first year of life in atopic and non-atopic infants
- Author
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A. Dulleck, C. H. L. Rieger, A. Banzhoff, and S. Petzoldt
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Hypersensitivity, Immediate ,Male ,Saliva ,Allergy ,Immunology ,Antibody Affinity ,chemical and pharmacologic phenomena ,First year of life ,Respiratory Syncytial Virus Infections ,Breast milk ,Antibodies, Viral ,Atopy ,fluids and secretions ,stomatognathic system ,Immunology and Allergy ,Medicine ,Humans ,Avidity ,Respiratory system ,Respiratory Tract Infections ,biology ,business.industry ,Infant, Newborn ,Infant ,Immunoglobulin E ,medicine.disease ,Fetal Blood ,Respiratory Syncytial Viruses ,Immunoglobulin G ,Pediatrics, Perinatology and Child Health ,Immunoglobulin A, Secretory ,biology.protein ,Female ,Antibody ,business - Abstract
Salivary SIgA antibodies against RS virus were studied in 105 children during the first year of life. The infants were divided into groups according to their risk of atopy. At birth 13 neonates showed measurable amounts of SIgA to RS virus. In another 26 children specific antibodies were detected but in concentrations too low for quantitative analysis. During the first year of life this increased to 29 antibody-positive samples with measurable amounts of antibody and 39 with concentrations too low for quantitative determination. At this time 8 children of the high risk group had developed symptoms of allergy. None of these children had measurable amounts of SIgA anti-RSV in their saliva. In comparison, 10 of the remaining 26 high risk infants without symptoms of allergy did have such antibodies. Atopic infants had significantly more respiratory infections during the first year of life than nonatopic infants. The avidity of SIgA anti-RSV in neonatal samples was significantly higher than avidity determined in breast milk SIgA but comparable to the avidity of serum IgG. During the first year of life a continuing decrease of salivary SIgA avidity was observed.
- Published
- 1994
18. The influence of thermal diffusion on laser ablation of metal films
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O. W. Käding, S. Petzoldt, Eckart Matthias, Michael Reichling, H. Skurk, Jan Siegel, P. Bizenberger, E. Neske, and Publica
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Laser ablation ,Materials science ,Physics and Astronomy (miscellaneous) ,medicine.medical_treatment ,General Engineering ,Analytical chemistry ,General Chemistry ,Laser ,Thermal diffusivity ,Threshold energy ,Ablation ,Evaporation (deposition) ,Fluence ,law.invention ,law ,medicine ,General Materials Science ,Thin film ,Composite material - Abstract
Single-shot ablation thresholds of nickel and gold films in the thickness range from 50 nm to 7 μm have been measured for 14 ns laser pulses at 248 nm, using photoacoustic shock wave detection in air. The metal films were deposited on fused silica substrates. The ablation threshold was found to increase linearly with film thickness up to the thermal diffusion length of the film. Beyond this point it remains independent of film thickness. The proportionality between threshold fluence and thickness allows the prediction of ablation thresholds of metal films from the knowledge of their optical properties, evaporation enthalpies and thermal diffusivities. Physically it proves that ablation is driven by the energy density determined by the thermal diffusion length. A simple thermodynamic model describes the data well. Thermal diffusivities, an essential input for this model, were measured using the technique of transient thermal gratings. In addition, the substrate dependence of the ablation threshold was investigated for 150 nm Ni films.
- Published
- 1994
19. Laser-ablation and thermal diffusivities of metal films on glass substrates
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E. Matthias, E. Neske, P. Bizenberger, M. Reichling, Jan Siegel, H. Skurk, O. W. Käding, and S. Petzoldt
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Laser ablation ,Materials science ,medicine.medical_treatment ,Analytical chemistry ,Substrate (electronics) ,Ablation ,Thermal diffusivity ,Metal ,visual_art ,Thermal ,visual_art.visual_art_medium ,medicine ,Thermal stability ,Thin film - Abstract
Using photoacoustic shock wave detection and transient thermal gratings, ablation thresholds (at 248 nm) and thermal diffusivities of nickel and gold films on fused silica have been measured in air for thicknesses ranging from 50 nm to 7 μm. In addition, for a given film thickness, the substrate dependence of the ablation threshold was investigated. For films on fused silica, the ablation thresholds vary linearly with film thickness up to a certain value, determined by the thermal diffusion length of the metal. Beyond this point the thresholds are independent of film thickness. This proves that ablation is driven by the thermal energy deposited per volume, where the latter is made up by irradiated area times thermal diffusion length. A simple thermodynamic model describes the data and allows the prediction of ablation thresholds for bulk metals and metal films. Thermal diffusivity measurements show no distinct dependence on film thickness and reproduce within a certain margin the bulk values of the metal.
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- 1993
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20. Photoacoustic and Photothermal Investigations of Thin Films
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Michael Reichling, Zhouling Wu, Henrik Grönbeck, H. Pietsch, E. Welsch, Eckart Matthias, S. Petzoldt, E. Hunger, and J. Jauregui
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Shock wave ,Materials science ,genetic structures ,business.industry ,Photothermal therapy ,Thermal diffusivity ,Signal ,Optical coating ,Thermal ,Optoelectronics ,sense organs ,Thin film ,business ,Anisotropy - Abstract
Three different techniques — mirage effect, photothermal displacement, and thermoreflectance — have been installed for investigating ablation thresholds and thermal properties of thin films. By monitoring the shock wave signal the mirage effect was used to measure ablation thresholds of optical coatings. For multilayer systems of type polymer-metal SiO2 changes in the shock wave signal allowed to distinguish between the ablation of different layers. The photothermal displacement method was applied to measure periodicity and decay of transient thermal gratings on surfaces of thin films. This technique yields information about lateral and vertical heat diffusion and is, therefore, sensitive to anisotropic heat transport in thin films. The potential of this technique for precise measurements of thermal diffusivities is illustrated for thin films of gold and amorphous diamond.
- Published
- 1992
- Full Text
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21. SO2-induced enhancement of inhalative allergic sensitization: inhibition by anti-inflammatory treatment
- Author
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F, Riedel, S, Naujukat, J, Rüschoff, S, Petzoldt, and C H, Rieger
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Anti-Inflammatory Agents, Non-Steroidal ,Guinea Pigs ,Enzyme-Linked Immunosorbent Assay ,Methylprednisolone ,Bronchial Provocation Tests ,Respiratory Function Tests ,Specific Pathogen-Free Organisms ,Disease Models, Animal ,Immunoglobulin G ,Administration, Inhalation ,Respiratory Hypersensitivity ,Animals ,Sulfur Dioxide ,Female - Abstract
Epidemiological studies have shown a relationship between air pollution and allergic airway disease. In a previous study we have found that exposure to SO2 enhances allergic sensitization to inhaled ovalbumin (OA) in the guinea pig. We have now investigated the influence of pre-treatment with anti-inflammatory drugs on SO2-induced enhancement of allergic sensitization in this model. Four groups of 6 guinea pigs each were exposed to 5 ppm SO2 on 5 consecutive days over 8 h per day with intermittent inhalation of OA, while the air-control group was exposed to clean air and OA. During the period of SO2 exposure and sensitization three experimental groups were treated with indomethacin (group I), methylprednisolone (group M) and nebulized nedocromil sodium (group N), while the control group remained untreated. Guinea pigs were investigated for sensitization to OA by specific bronchial provocation tests using body plethysmographic measurement of compressed air (CA) and by measurement of specific antibody response in serum. While in the SO2-exposed control group 5 of 6 animals reacted to specific bronchial provocation testing (CA median 0.15 ml, range 0-0.175 ml), only 1 animal was sensitized in group M (CA 0 ml, 0-0.125, p0.05), whereas no bronchial reactions were seen in groups I and N (CA 0 ml, 0-0.05, p0.025). Specific IgG antibody titres increased in the control group (median 43 EU--85 EU), but not in the treatment groups (medians group I 35 EU--35 EU, group M 30--35 EU, group N 64--50 EU).(ABSTRACT TRUNCATED AT 250 WORDS)
- Published
- 1992
22. Thin-film selective multishot ablation at 248 nm
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Eckart Matthias, Hans Eckard Hunger, S. Petzoldt, and H. Pietsch
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chemistry.chemical_classification ,Pulsed laser ,Materials science ,business.industry ,Optical engineering ,medicine.medical_treatment ,Excimer laser ablation ,Photoacoustic imaging in biomedicine ,Polymer ,Ablation ,X-ray laser ,Optics ,chemistry ,medicine ,Thin film ,business - Abstract
Excimer laser ablation of multi-layered films was studied using the photoacoustic mirage effect technique. Layered systems of a polymer-metal-SiO2 type was investigated for various metals between 0.5 and 2 J/cm2. Significant changes in the deflection signal were found when the ablation passed the interface between subsequent layers. This effect can be used to distinguish between different materials and is therefore suited for an in situ control of pulsed laser processing.© (1991) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
- Published
- 1991
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23. Multishot ablation of thin films: sensitive detection of film/substrate transition by shockwave monitoring
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Juergen Reif, Eckart Matthias, Hans Eckard Hunger, S. Petzoldt, and H. Pietsch
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Shock wave ,Materials science ,Excimer laser ,business.industry ,medicine.medical_treatment ,Laser ,Ablation ,law.invention ,Optics ,Optical microscope ,law ,medicine ,Thin film ,business - Abstract
During multishot ablation with 248 nm excimer laser pulses for each single laser shot the shock wave emerging from the ablated material was monitored by the acoustic mirage effect. The shockwave parameters turned out to depend sensitively on the nature of the ablated material. In particular during ablation of a polymeric film/Si02/Si multilayer system distinct changes in the deflection signal were found when the ablation was driven through the interface between layers. Inspection by optical microscopy and depth profil ing was used as cross check. 1.
- Published
- 1991
- Full Text
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24. Breast feeding modifies production of SIgA cow's milk-antibodies in infants
- Author
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H. Prinz, C. Brehler, H. Renz, S. Petzoldt, and C. H. L. Rieger
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Male ,medicine.medical_specialty ,Allergy ,Saliva ,Secretory antibody ,Physiology ,Lactoglobulins ,fluids and secretions ,Internal medicine ,Immunopathology ,medicine ,Milk antibodies ,Hypersensitivity ,Animals ,Humans ,biology ,Milk protein ,Milk, Human ,business.industry ,Infant, Newborn ,food and beverages ,Caseins ,Infant ,General Medicine ,medicine.disease ,Endocrinology ,Breast Feeding ,Milk ,Immunoglobulin M ,Pediatrics, Perinatology and Child Health ,Immunoglobulin A, Secretory ,biology.protein ,Female ,Antibody ,business ,Breast feeding ,Follow-Up Studies - Abstract
One hundred and fifty-eight healthy mature newborns were divided into 3 groups according to their risk of allergy: Group A, no risk (n = 62), group B, low risk (n = 30) and Group C, high risk (n = 66). Saliva was collected at birth and after 3 and 6 months. SIgA anti-casein and anti-beta-lactoglobulin were determined by a direct ELISA technique. The highest concentrations of secretory antibodies were measured after birth. After 3 months, breast fed infants had lower salivary SIgA anti-casein concentrations than the group receiving cow's milk (p less than 0.01). The effect of breast-feeding was seen even after a nursing period of only 3 weeks. Infants without risk of allergy fed cow's milk exclusively had higher SIgA anti-casein (p less than 0.03) and anti-beta-lactoglobulin concentrations than low risk infants at the age of 6 months. These data show a modifying effect of breast feeding on salivary SIgA production against cow's milk protein.
- Published
- 1991
25. Secretory antibodies to cow milk proteins and to respiratory syncytial virus
- Author
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C H, Rieger, A, Banzhoff, H, Renz, W, Schuy, S, Petzoldt, A, Eckhart, H, Prinz, and K D, Schulz
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Hypersensitivity, Immediate ,Immunoglobulin M ,Milk, Human ,Immunoglobulin A, Secretory ,Infant, Newborn ,Animals ,Humans ,Infant ,Cattle ,Antibodies, Viral ,Milk Proteins ,Saliva ,Respiratory Syncytial Viruses - Published
- 1991
26. Shockwave detection: an efficient way to determine multiple-pulse damage thresholds
- Author
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S. Petzoldt
- Subjects
Computer science ,Acoustics ,Multiple pulse - Published
- 1990
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27. Contents, Vol. 90, 1989
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Kazuo Tuzuki, Yasushi Nagata, Hisao Tomioka, R. Urbanek, J.G. McCormack, Itsuo Iwamoto, Y.H. Thong, Kimie Fukuyama, Shiei Lee, B. Fox, T.H.P. Hanahoe, Fumihiko Ohmori, R.A. Mäntyjärvi, Nagae Sugai, Francesca Levi-Schaffer, Kenji Hayama, T.W. Higenbottam, Meir Shalit, Hiroaki Kikuchi, Tadashi Kawai, Frans M.A. Hofhuis, V. Stephan, Shoji Tanaka, W.M. Purcell, Hiroyuki Kohno, W.K. Seow, I. Béládi, Akihiko Hashimoto, Takao Koike, Akira Fujioka, William L. Epstein, Tetsuji Hirao, Hiroshi Mori, A.W. Wheeler, Makoto Tanaka, Shimpei Torii, S. Petzoldt, A.E. Butterworth, Atsuo Urisu, G.T. Mai, Jin Ito, V.M. Spackman, Masanori Yamada, Mitsue Fujita, Satoshi Konno-Amano, Kenji Tanaka, M. Degré, Cees Hol, T.H. Ojanen, Junzo Suzuki, D.L. Cohen, U. Schauer, Kareen J. I. Thorne, Sho Yoshida, H.J.W. Jägerroos, Setsuo Kobayashi, C.H.L. Rieger, Hans van Dijk, F. Riedel, J. Kühr, B.A. Richardson, Yvette Mándi, Shinya Inai, Osamu Harayama, M. Deards, Carlo Pincelli, Motohiro Kurosawa, Yoshihisa Sato, I. Hay, J.K. Ylönen, Yoshio Matsuda, N. Kanter, Shoji Yoshida, B.E. Hickman, Yoshimichi Okayama, Tatsuo Sakamoto, Nawata Y, Yohji Akagaki, S.G.O. Johansson, M. Jackson, and Hozumi Kondo
- Subjects
Immunology ,Immunology and Allergy ,General Medicine ,Biology - Published
- 1989
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28. The role of defects in laser surface damage thresholds of fluoride crystals
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J. Reif, S. Petzoldt, A. P. Elg, and Eckart Matthias
- Subjects
Materials science ,Physics and Astronomy (miscellaneous) ,Pulse (signal processing) ,Band gap ,business.industry ,General Engineering ,Physics::Optics ,General Chemistry ,Laser ,Molecular physics ,Avalanche breakdown ,law.invention ,Metal ,Optics ,law ,visual_art ,visual_art.visual_art_medium ,General Materials Science ,Irradiation ,Absorption (electromagnetic radiation) ,business ,Surface states - Abstract
The energy of the acoustic pulse generated by laser-surface interactions and measured by probe beam deflection was used to investigate laser surface damage thresholds of fluoride crystals with optical quality. It was found that damage thresholds decrease with increasing density of surface states. The defect density also controls the energy absorption mechanism: for surfaces with few defects, like polished MgF2 and CaF2, avalanche breakdown occurs at above 1 GW/cm2, whereas for materials with lower damage thresholds, such as LiF, BaF2, and roughened or incubated surfaces of CaF2, multiphoton absorption across the band gap is observed.
- Published
- 1989
- Full Text
- View/download PDF
29. Surface laser damage thresholds determined by photoacoustic deflection
- Author
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A. P. Elg, S. Petzoldt, Eckart Matthias, Michael Reichling, and J. Reif
- Subjects
Photoacoustic effect ,Physics and Astronomy (miscellaneous) ,Scattering ,business.industry ,Chemistry ,Physics::Optics ,Photoacoustic imaging in biomedicine ,Laser ,law.invention ,Optics ,Laser damage ,Deflection (engineering) ,law ,Optical materials ,Irradiation ,business - Abstract
The technique of intensity dependent photoacoustic probe beam deflection has been applied to the determination of surface damage thresholds. We take advantage of an unambiguous correlation between the degree of laser damage and the energy in the generated acoustic pulse. The high sensitivity of this method, cross checked by measuring scatter losses in reflection, is independent of any surface optical properties. As an example for optical materials, damage thresholds for MgF2 and CaF2 have been determined to be about 1.4 GW/cm2 , and for LiF to be about 0.2 GW/cm2 .
- Published
- 1988
- Full Text
- View/download PDF
30. Laser-Surface Interaction in Air Studied by Photoacoustic Probe Beam Deflection
- Author
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S. Petzoldt, A.P. Elg, J. Reif, and E. Matthias
- Abstract
In the interaction of high intensity pulsed laser radiation with surfaces of transparent solids the emission of neutral and charged particles or the ignition of a plasma is observed1. While the underlying processes are mostly studied under vacuum conditions by detecting the emitted particles2, their investigation in ambient air is also highly desirable from the applied point of view.
- Published
- 1989
- Full Text
- View/download PDF
31. Investigation of surface damage thresholds by photoacoustic deflection
- Author
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Eckart Matthias, J. Reif, S. Petzoldt, and A. P. Elg
- Subjects
Inert ,Materials science ,Dielectric strength ,business.industry ,Analytical chemistry ,Physics::Optics ,Thermal ionization ,Radiation ,Laser ,law.invention ,Optics ,Deflection (engineering) ,law ,business ,Photoacoustic spectroscopy ,Order of magnitude - Abstract
Intensity dependent laser surface damage of optical materials in air was studied by photoacoustic probe beam deflection. The technique permits a reliable determination of damage thresholds and yields information about the basic energy coupling mechanisms between radiation and surface. For highly inert surfaces, like polished fused silica, MgF2, and CaF2, thresholds of about 1 GW/cm2 due to dielectric breakdown are found. Defect rich surfaces exhibit thresholds an order of magnitude lower, which appear to result from multiphoton surface ionization.
- Published
- 1989
- Full Text
- View/download PDF
32. Bronchial sensitization in guinea pigs following ingestion of ovalbumin
- Author
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N. Kanter, C.H.L. Rieger, S. Petzoldt, Frank Riedel, and Uwe Schauer
- Subjects
Time Factors ,Ovalbumin ,Immunology ,Guinea Pigs ,Bronchi ,Immunoglobulin E ,Bronchial Provocation Tests ,Guinea pig ,Tap water ,Antigen ,medicine ,Hypersensitivity ,Immunology and Allergy ,Ingestion ,Animals ,Sensitization ,Aerosols ,biology ,business.industry ,General Medicine ,Plethysmography ,medicine.anatomical_structure ,Immunoglobulin G ,biology.protein ,Bronchoconstriction ,Female ,medicine.symptom ,business ,Bronchoalveolar Lavage Fluid - Abstract
Local bronchial mucosal hypersensitivity following antigen feeding was studied in the guinea pig. Groups of 6 animals were fed 1% ovalbumin (OA) in tap water or tap water without antigen (control group) for different feeding periods (14, 28, 42, and 56 days). Inhalative provocations with increasing concentrations of OA (0.5–8% OA) were performed at the end of each feeding period followed by body plethysmographic measurement of airway obstruction. Specific bronchial hypersensitivity to inhaled OA was not found in the control group, whereas specific bronchial reactivity to OA, described as reactivity index, was significantly different from the control group after 14 (p
- Published
- 1989
33. Advantages of concurrent use of multiple software frameworks in water quality modelling using a database approach
- Author
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Sien Liu, Luuk P. A. van Gerven, Jochem 't Hoen, Andrea S. Downing, Christophe Thiange, M.H.J.L. Jeuken, Robert J. Brederveld, Michiel Faber, Egbert H. van Nes, Jan J. Kuiper, Daan J. Gerla, Bob W. Kooi, Sebastiaan A. Schep, Dennis Trolle, Jeroen J. M. de Klein, Thomas Petzoldt, Donald L. DeAngelis, Wolf M. Mooij, Sven Teurlincx, Jan H. Janse, Betty Lischke, Annette B.G. Janssen, and Aquatic Ecology (AqE)
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Differential equations ,Aquatic Ecology and Water Quality Management ,Process (engineering) ,Computer science ,PCLake ,Model implementation ,Closed ,Database approach to modelling ,Modelling framework ,Aquatic Science ,computer.software_genre ,DATM ,PCDitch ,Multidisciplinary approach ,Ecosystem model ,DELWAQ ,Overhead (computing) ,OSIRIS ,MATLAB ,Ecology, Evolution, Behavior and Systematics ,computer.programming_language ,WIMEK ,Ecology ,Database ,DUFLOW ,Water quality modelling ,Community-based modelling ,Aquatische Ecologie en Waterkwaliteitsbeheer ,PE&RC ,Model analysis ,Software framework ,ACSL ,international ,GRIND ,computer - Abstract
Water quality modelling deals with multidisciplinary questions ranging from fundamental to applied. Addressing this broad range of questions requires multiple analysis techniques and therefore multiple frameworks. Through the recently developed database approach to modelling (DATM), it has become possible to run a model in multiple software frameworks without much overhead. Here we apply DATM to the ecosystem model for ditches. PCDitch and its twin model for shallow lakes PCLake. Using DATM, we run these models in six frameworks (ACSL, DELWAQ, DUFLOW, GRIND for MATLAB, OSIRIS and R), and report on the possible model analyses with tools provided by each framework. We conclude that the dynamic link between frameworks and models resulting from DATM has the following main advantages: it allows one to use the framework one is familiar with for most model analyses and eases switching between frameworks for complementary model analyses, including the switch between a 0-D and 1-D to 3-D setting. Moreover, the strength of each framework – including runtime performance – can now be easily exploited. We envision that a community-based further development of the concept can contribute to the future development of water quality modelling, not only by addressing multidisciplinary questions but also by facilitating the exchange of models and process formulations within the community of water quality modellers.
- Published
- 2015
- Full Text
- View/download PDF
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