87,089 research outputs found
The Pfefferkorn family centennial re-union, July 21, 1957 : Pfefferkorn homestead (Manitowoc county, Wis.) /
No full text"Erwin Pfefferkorn, Secretary."Cover title.Mode of access: Internet
High-speed X-ray study of process dynamics caused by surface features during continuous-wave laser polishing
No full textThis dataset contains raw files and experimental details for the manuscript "High-speed X-ray studyof process dynamics caused by surface features during continuous-wave laser polishing". This studyemploys high speed X-ray imaging to capture the process dynamics during continuous wave laser polishing in-situ, using a high-intensity X-ray beam to image a 2mm x 0.5mm area at 50,000 frames per second. A 200um laser beam with a gaussian profile and wavelength of 1070 nm was incident to a surface with a single ~100um triangular surface feature milled onto the surface. Laser power was 200 W and the scanning velocity was 200mm/s. The density changes captured by the high-intensity X-ray beam show the melt pool and corresponding keyhole to vary significantly in shape as the melt traverses the single surface feature. This shared data contains the following files and folders:1) X-ray stills (Raw): 631 frames/files; 12-bit grayscale images; Can be directly opened as an image stack in ImageJ software2) X-ray stills (filtered): 560 frames/files; 16-bit grayscale images;- Video was trimmed to make the Matlab code run faster by eliminating frames at the beginning and end where nothing was happening.- Corresponds to frames 21 through 580 in Raw X-ray stills- The top 50 rows and bottom 50 rows from Raw images were cropped out of these images 3) Supplementary video file (Raw):4) Supplementary video file (filtered):5) Image processing script 1: Matlab script for reading raw X-ray still images, filtering, and generating the composite image.6) Image processing script 2: Matlab script for determining keyhole boundary and measuring keyhole depth and width.7) Raw images of elctroetched melt pool cross sections8) Metadata: Laser beam characterizationThe data was collected on February 23rd - 25th at Argonne National Lab's Advanced Photon Source at beamline 32ID-B by Patrick Faue and Hemant Agiwal.Advanced Photon Source contacts: Samuel J. Clark and Kamel FezzaaThis research used resources of the Advanced Photon Source, a US Department of Energy (DOE) Office of Science user facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. The study was funded through the National Science Foundation and German Research Foundation (NSF grant 1727366).Submitted manuscript: Patrick Faue, Lewin Rathman, Marius Möller, Mahmudul Hassan, Samuel J. Clark, Kamel Fezzaa, Kevin Klingbeil, Brodan Richter, Joerg Volpp, Tim Radel, Frank E. Pfefferkorn “High-speed X-ray study of process dynamics caused by surface features during continuous-wave laser polishing". CIRP ANNALS (2023
Data for: Modification of surface characteristics and electrochemical corrosion behavior of selective laser melted stainless steel 316L after laser polishing
No full textCSV files containing the data plotted in figures that are presented in the paper of stainless steel 316L before and after laser remelting: i.e., laser polishing. The data includes: surface topography, surface roughness metrics, x-ray diffraction, micro-hardness, residual stress, electrochemical analysis for corrosion behavior
Soft X-ray properties of a spectroscopically selected sample of interacting and isolated Seyfert galaxies
No full textWe present a catalogue of ROSAT detected sources in the sample of spectroscopically selected Seyfert 1 and Seyfert 2 galaxies of Rafanelli et al. (\cite{Rafanelli95}). The catalogue contains 102 Seyfert 1 and 36 Seyfert 2 galaxies. The identification is based on X-ray contour maps overlaid on optical images taken from the Digitized Sky Survey. We have derived the basic spectral and timing properties of the X-ray detected Seyfert galaxies. For Seyfert 1 galaxies a strong correlation between photon index and X-ray luminosity is detected. We confirm the presence of generally steeper X-ray continua in narrow-line Seyfert 1 galaxies (NLS1s) compared to broad-line Seyfert 1 galaxies. Seyfert 2 galaxies show photon indices similar to those of NLS1s. Whereas a tendency for an increasing X-ray luminosity with increasing interaction strength is found for Seyfert 1 galaxies, such a correlation is not found for Seyfert 2 galaxies. For Seyfert 1 galaxies we found also a strong correlation for increasing far-infrared luminosity with increasing interaction strength. Both NLS1s and Seyfert 2 galaxies show the highest values of far-infrared luminosity compared to Seyfert 1 galaxies, suggesting that NLS1s and Seyfert 2 galaxies host strong (circumnuclear) star formation. For variable Seyfert galaxies we present the X-ray light curves obtained from the ROSAT All-Sky Survey and from ROSAT PSPC and HRI pointed observations. Besides the expected strong short- and long-term X-ray variability in Seyfert 1 galaxies, we find indications for X-ray flux variations in Seyfert 2 galaxies. All overlays can be retrieved via CDS anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5)} or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/368/79
Fully Consolidated Deposits from Oxide Dispersion Strengthened and Silicon Steel Powders via Friction Surfacing
No full textThis dataset includes:Filename [file type]A. Deposition Process Parameters and Deposit Morphology [PDF]B. Raw force data for depositing FeAlOY [CSV]C. Size distribution of powders [CSV]D. EDS analysis of FeAlOY deposit and Fe-Si 6.8 wt% deposit [PDF]The data presented in this study was collected by Aishwarya Deshpande, Christian Baumann, Patrick Faue, Michael Mayer, Gerald Ressel, Friedrich Bleicher, Frank E. Pfefferkorn.This research used resources at the Mechanical Engineering department, University of Wisconsin-Madison, the Institute of Production Engineering and Photonic Technologies, TU-Wien and Materials Center Leoben.The study was funded by the Austrian Marshall Plan Foundation endowed professorship (FFG Project Number 846946)Accepted manuscript:A. Deshpande, P. Faue, C. Baumann, M. Mayer, S. Krall, F. Bleicher, F. E Pfefferkorn, 2024, "Fully Consolidated Deposits from Oxide Dispersion Strengthened and Silicon Steel Powders via Friction Surfacing," Journal of Manufacturing Science and Engineering, ASME.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV
Der Sophist als mimêtês tôn ontôn (Sph. 235a1 f. ). Ontologische Implikationen
No full textThis paper aims to show how the expression μιμητὴς τῶν ὄντων plays a fun‐ damental role in relation to the overall structure of Plato’s Sophist. Through this definition of the sophist, the issue of the nature of falsehood is effectively introduced. What does “imitator of real things” exactly mean? The sophist is considered as an illusionist and a deceiver: he produces φαντάσματα and εἴδωλα. On the contrary, the philosopher knows the authentic nature of reality in its structure and intertwining (συμπλοκή). Both the sophist and the philosopher use the logos as their specific instrument: but the sophist uses it in a deceptive way in order to persuade his own audience and perform his ‘deceptive artʼ (ἀπατητικὴ τέχνη); instead, the philosopher uses it to describe the real nature of being. Therefore, in the Sophist the analysis of the structure of logos becomes central: indeed, according to the Platonic perspective, there is an essential correspondence between the structure of logos and the structure of reality
Dimensionless numbers for predicting process parameter boundaries in friction surfacing
No full textThis shared data contains the following files:Appendix A: Dimensional analyses and generation of dimensionless numbersAppendix B: Variation of heat flux with dimensionless numbersAppendix C: Tensile testing for friction surfaced specimenAppendix D: Experimental data from friction surfacing of 6060 Aluminum Appendix E: Experimental data from friction surfacing of 304L Stainless steelAppendix F: Videos of friction surfacing experimentsThe data presented in this study was collected by Hemant Agiwal, Christian Baumann, Stephan Krall, Friedrich Bleicher, and Frank E. Pfefferkorn.This research used resources at the Mechanical Engineering department, University of Wisconsin-Madison and the Institute of Production Engineering and Photonic Technologies, TU Wien.The study was funded by the U.S. Department of Energy (Grant DE - NE0008801), and the Austrian Marshall Plan Foundation endowed professorship (FFG Project Number 846946)Submitted manuscript: Agiwal, Hemant, Christian Baumann, Stephan Krall, Friedrich Bleicher, and Frank E. Pfefferkorn. “Dimensionless numbers for predicting process parameter boundaries in friction surfacing.” CIRP Annals (2023).THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV
Der Sophist als mimêtês tôn ontôn (Sph. 235a1 f. ). Ontologische Implikationen
No full textThis paper aims to show how the expression μιμητὴς τῶν ὄντων plays a fun‐ damental role in relation to the overall structure of Plato’s Sophist. Through this definition of the sophist, the issue of the nature of falsehood is effectively introduced. What does “imitator of real things” exactly mean? The sophist is considered as an illusionist and a deceiver: he produces φαντάσματα and εἴδωλα. On the contrary, the philosopher knows the authentic nature of reality in its structure and intertwining (συμπλοκή). Both the sophist and the philosopher use the logos as their specific instrument: but the sophist uses it in a deceptive way in order to persuade his own audience and perform his ‘deceptive artʼ (ἀπατητικὴ τέχνη); instead, the philosopher uses it to describe the real nature of being. Therefore, in the Sophist the analysis of the structure of logos becomes central: indeed, according to the Platonic perspective, there is an essential correspondence between the structure of logos and the structure of reality
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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