236 research outputs found
Direct and Indirect Measurement of Complex Poisson's Ratio - Indirect Measurement in Torsion and Tension
No full textThis data set contains indirectly calculated complex Poisson's ratio by determining the complex Young's E* and complex shear modulus G* from torsion and tension measurements. The measurements were performed on cylindric polymethyl methacrylate (PMMA, EH-Design, Wörrstadt, Germany) samples with a diameter of d = 3 mm. Frequency measurements were performed with a rheometer (MCR 702, linear motor, Anton-Paar, Graz, Austria) in a angular frequency range of 0.628 rad/s to 188 rad/s with an axial strain of epsilon = 0.01 % and shear strain of gamma = 0.01 % at constant temperatures in the range of 15 to 105 °C. The Elastic Viscoelastic Correspondence Principle (EVCP) is applied to calculate the complex Poisson's ratio
micro-XRCT data set of an in-situ flow experiment with an X-ray transparent flow cell
No full textMicro-XRCT data sets (projection and reconstructed images) of an in-situ experiment with an X-ray transparent flow cell. As a porous medium, a 3 mm cylindrical sandstone core from the County of Bentheim was investigated. The conceptual design of the cell was presented in Fusseis et al. (2014) and offers the possibility to apply a confining and backpressure, and to inject a pore
fluid under X-ray radiation.
Two scans were performed. The first scan was performed on the dry sample. The second scan was performed after the sample was saturated with 3M KI solution (3 mol potassium iodide per liter distilled water) with a constant flow of 100 µl/s against a backpressure of 0.28 MPa. To prevent hydrogen formation due to the X-rays, a flow of 0.5 µl/s was maintained against a backpressure of 0.28 MPa during the entire second scan. Both scans were performed under the same confining pressure of 0.6 MPa and with identical scan settings
micro-XRCT dataset of Enzymatically Induced Calcite Precipitation (EICP) in a microfluidic cell
No full textmicro-XRCT dataset (projection and reconstructed images) based on a region of interest scan (diameter 12.49 mm, height 9.09 mm) of a microfluidic cell including calcium carbonate aggregates along with the processed dataset (cropped, transformed and binarized)
Spectroscopy and population decay of a van der Waals gap state in layered<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>TiSe</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
No full textLower self-positivity and its association with self-esteem in women with borderline personality disorder
No full textAbstract: Self-esteem, the global attitude towards one's self, is low in persons with borderline personality disorder (BPD). This may be partially due to the ways these persons protect or enhance the self. A case in point is self-positivity, the association of positive rather than negative events, experiences, and objects with the self. Self-esteem and self-positivity may result from either conscious or non-conscious processes. We examined whether low self-esteem is related to low self-positivity in BPD, and whether their covariation is contingent upon conscious processing. We assessed explicit self-esteem via self-report (Rosenberg Self-Esteem Scale) and implicit self-esteem via the Initial Preference Task in women with BPD and healthy control women. We assessed self-positivity in a self referential processing task, in which participants rated the valence of positive, neutral, and negative nouns, and later recalled them. We manipulated referential context via supraliminal or subliminal priming of self-reference, other-reference, or no reference. Explicit and implicit self-esteem were lower in the BPD group than in the healthy control group. Participants with BPD rated self-referential words less positively, when primes were presented supraliminally. Less positive and slower ratings of positive self-referential words were associated with lower explicit, but not implicit, self-esteem in the BPD group
Image processing code for characterization of multiphase flow in porous media
No full textThis work utilizes microfluidic experiments to gather data captured as snapshots during the experiments. These snapshots provide real-time information and undergo image processing to derive the required data. Image processing involves several steps tailored to the investigations:
Making a reference image (mask): This process involves creating a reference image, or mask, to document the initial conditions. For instance, the porous domain is imaged when saturated with one phase to differentiate various areas containing different phases.
Reading and cutting images: Images showing changes in fluid volume fraction are selectively chosen and processed. Each image is read into MATLAB, and the area of interest is extracted.
Image segmentation: Labeling each pixel of the images is done via thresholding and edge detection.
Measuring parameters: Parameters like saturation, interfacial length, area, contact angle, and curvature are measured. These parameters play a crucial role in analyzing the experiments. The interfacial area is calculated through various formulations.
Calculating capillary pressure: Several forms of capillary pressure are calculated using information derived from the experiments.
REV-Scale Quantities: Parameters are upscaled to represent Representative Elementary Volume (REV)-scale values essential for continuum theories. REV-scale capillary pressure is derived from pore-scale values using appropriate averaging techniques.
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Influence of the thickness of amorphous Fe Ni B ribbons on their mechanical properties under neutron-irradiation and thermal annealing
No full textSIGLESpecial print from: Steeb, S.; Warlimont, H. (eds.): Rapidly quenched metals, Elsevier, Amsterdam (Netherlands), 1985, p. 1377-1380 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman
Moessbauer spectroscopy and complementary studies of n-irradiated and annealed amorphous Fe40Ni4010B20
No full textSpecial print from Steeb, S.; Warlimont, H. (eds.): 'Rapidly Quenched Metals', Elsevier Science Publishers B.V., 1985Copy held by FIZ Karlsruhe; available from UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman
In vitro-Abzugsversuche an Mesostrukturen mittels Folienprägetechnik auf Zirkonoxidkeramik(ZrO2) und Sekundärkoni aus Kobalt-Chrom-Molybdän(Co-Cr-Mo)
No full textDoppelkronensysteme mit definierter und reproduzierbarer Haftkraft, mit einem dem natürlichen Prämolaren ähnlichen Aussehen und Wegfall der bisher bestehenden Korrosionsproblematik stehen im Mittelpunkt dieser Arbeit. Hierfür wurden 9 Zirkonoxidprimärkronen aus Cercon® (Fa. DeguDent, Hanau) zusammen mit NEM-Sekundärkronen aus Vi-Comp® (Fa. Austenal, Köln) hergestellt. Mit Hilfe einer Folienprägetechnik wurde für alle Prüfkörper jeweils eine Mesostruktur aus einer 50µm Gold-Platin-Folie gefaltet, welche dann mittels Composit Attachment Cement (Nimetic Cem®, Seelfeld) auf V2A-Stahlstäbe befestigt wurden. Diese Prüfkörper wurden mit je 50, 100, 200N belastet und unter Luft, Wasser und Clandosane® (cell pharm, Hannover) mit je 125, 150 und 500mm/min durch die Universalprüfmaschine Zwick Z 050 abgezogen. Anschließend wurde die für die Trennung notwendige Abzugskraft Fz gemessen. Pro Probenkörper wird ein Vorlauf von 100 Zyklen mit 50N Belastung durchgeführt. Die Messung wurde für alle 9 Prüfkörper je 3 mal wiederholt. Der Prüfkörper Nr. 4 wurde aufgrund seiner zu hohen Medianwerte von vergleichsweise >50% der Abzugskraft als Ausreißer von der Analyse ausgeschlossen, so dass 648 Messwerte resultierten. Mit Hilfe des Hystereseprogrammes testXpert® der Universalprüfmaschine Z 050 (Fa. Zwick, Ulm) konnte die Abzugskraft Fz entsprechend des Kurvenpeaks unterhalb der Nulllinie bestimmt werden. Die vorab erwarteten Ergebnisse haben sich alle bestätigt: Milieu (Viskosität), Aufpresskraft Fp und Abzugsgeschwindigkeit v haben in genannter Reihenfolge in absteigender Wertigkeit Einfluss auf die Haftkraft Fz. Die Abzugskraft FZ steigt bei gleich bleibender Abzugsgeschwindigkeit v mit zunehmender Aufpresskraft Fp bei gleichem Milieu bei Zimmertemperatur (ca. 20°C). Ebenso steigt sie mit zunehmender Milieuviskosität, bei gleicher Aufpresskraft Fp, bei gleich bleibender Abzugsgeschwindigkeit v und bei Zimmertemperatur (ca. 20°C). Die Abzugskraft FZ sinkt mit steigender Abzugsgeschwindigkeit v bei gleich bleibender Aufpresskraft Fp, sowohl bei gleichem Milieu, als auch bei Zimmertemperatur (ca. 20°C). 1 In vitro-Abzugsversuche an Mesostrukturen mittels Folienprägetechnik auf Primärkoni aus Zirkonoxidkeramik (ZrO2) und Sekundärkoni aus Kobalt-Chrom-Molybdän (Co-Cr-Mo) Autor: Annette Siebert-Steeb Vergleichbare Abzugswerte sind bei der konventionellen Folienkonusversion NEM-NEM 5° und der hier verwendeten ZrO2-NEM 6° Version zu finden. Der Zahntechniker kann über Variieren des Entlastungsspaltes mit Hilfe der Dicke des Platzhalterlackes auf die Haftungseigenschaften der Folienkonuskronen Einfluss nehmen, d.h. je kleiner der Spalt, desto schneller ist das Kraftmaximum erreicht. Wodurch extraoral die Haftkraft definiert werden, ohne nach intraoraler Verklebung böse Überraschungen zu erleben. Ursächlich für die Haftkraft ist das Tribologische System (der hydraulische und adhäsive Effekt), vergleichbar mit den Galvanodoppelkronen. Es zeigt sich ein signifikanter Einfluss der Aufpresskraft Fp auf die Abzugskraft FZ. Die Haftkraft des Konus durch den Winkel wirkt primär, dann sinkt bei steigender Abzugsgeschwindigkeit die Haftkraft entgegen den Galvanoteleskopen. Somit besteht ein umgekehrter linearer Zusammenhang zwischen Abzugskraft FZ und Abzugsgeschwindigkeit v.This investigation focused on double-crown systems with defined and replicable adhesive strength, a natural appearance similar to premolars and absence of the former problem of corrosion. Nine zirconium oxide primary crowns were manufactured using Cercon® (produced by DeguDent, Hanau) along with NEM secondary crowns made from Vi-Comp® (produced by Austenal, Cologne). A mesostructure was made by folding 50µm gold platinum foil for all the test specimens following the embossing foil technique. These structures were cemented onto V2A steel posts using a composite attachment cement (Nimetic Cem®, Seelfeld). The test specimens were subjected to 50, 100, 200N and retention tested for the treatment groups air, water and Clandosane® (cell pharm, Hannover) at 125, 150 and 500mm/min on the Universal Zwick Z 050 testing machine. Thereafter the pull-off Fz force required for separation was measured. Each test specimen was subjected to 100 cycles of 50N. The measurement was repeated 3 times for all nine test specimens. Test specimen no. 4 was excluded from the analysis as a maverick due to its high median values of >50% of the pull-off force, which resulted in a remaining 648 measurements. The pull-off force Fz was determined in accordance with the curve peak under the zero line by applying the hysteresis software testXpert® of the Universal Z 050 testing machine (Zwick, Ulm). All the predicted results were confirmed: Milieu (viscosity), compression load Fp and pull-off speed v affect the retention strength Fz in decreasing order of priority. The pull-off force Fz increases for a constant pull-off speed v with an increasing compression load Fp for the same milieu viscosity at room temperature (approx. 20°C). Likewise it increases with increasing milieu viscosity for a constant compression load Fp, constant pull-off speed v at room temperature (approx. 20°C). The pull-off force Fz decreases with increasing pull-off force v for constant compression load Fp, for a constant milieu and room temperature (approx. 20°C). 1 In vitro investigation of the retention strength of secondary structures based on embossing a foil on the primary abutment crowns made from zirconium oxide ceramic (ZrO2) and secondary structure from cobalt chrome molybdenum (Co-Cr-Mo) Author: Annette Siebert-Steeb The retention values of the conventional foil structure version NEM-NEM 5° are comparable to those of the ZrO2-NEM 6° version used in this investigation. The dental technician can influence the adhesion properties of the foil structure crown control by varying in the ease gap according to the thickness of the die spacer. The smaller the gap, the faster maximum strength is achieved. The adhesive strength is defined extra-orally without there being unpleasant surprises following intraoral adhesion. The source of the retention strength is the tribological system (hydraulic and adhesive effect) and is comparable to that of galvano double crowns. It is clear that compression load Fp has a significant effect on pull-off force FZ. The adhesive strength of the structure is primarily due to its angle, as the pull-off speed increases the retention strength of the galvano telescopes decreases. Thus there is an inverse linear correlation between the pull-off force FZ and pull-off speed v
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