The Use of Untreated Neuburg Siliceous Earth as Filler for High-Density Polyethylene

This paper reports the results of a study on twin-screw direct extrusion run at a screw speed of 120 rev/min to produce a composite pellet product which was used for an injection molding process and after that subjected to static tensile testing as well as hardness and specimen morphology examination. As filler, we used untreated Neuburg siliceous earth (NSE) marketed under trade names Silitin Z86 and Silitin V88 ranging from 10 to 60 wt% in a matrix made of high-density polyethylene (PE-HD) Hostalen GD 7255. The results demonstrate that Young‘s modulus and maximum tensile stress of the polyethylene composite with untreated Neuburg siliceous earth first decrease and then increase with increasing the filler’s content. The addition of Silitin Z86 causes an increase in tensile stress at break while the addition of Silitin V88 leads to its decrease. Strain at maximum tensile stress of the tested molded pieces first increases with increasing the filler’s content, but then starts to decrease. The tested composite molded pieces have lower strain at break as opposed to those without the filler. An increase in the filler’s content leads to an increase in hardness of the tested specimens. The results of specimen morphology demonstrate that the filler is unevenly distributed in the polymer and reveals a strong tendency to agglomerate

Review on Superconducting Materials

Short review of the topical comprehension of the superconductor materials classes Cuprate High-Temperature Superconductors, other oxide superconductors, Iron-based Superconductors, Heavy-Fermion Superconductors, Nitride Superconductors, Organic and other Carbon-based Superconductors and Boride and Borocarbide Superconductors, featuring their present theoretical understanding and their aspects with respect to technical applications.Comment: A previous version of this article has been published in \" Applied Superconductivity: Handbook on Devices and Applications \", Wiley-VCH ISBN: 978-3-527-41209-9. The new extended and updated version will be published in \" Encyclopedia of Applied Physics \", Wiley-VC

Johannes Colerus en de groote twisten in de Nederlandsche Luthersche kerk zijner dagen

Proefschrift--Utrecht.Bibliographical foot-notes.Mode of access: Internet

Ultraschneller 3D-Druck: Additive High-Speed-Fertigung von Kunststoffbauteilen aus Standardgranulat

3D printing is a fast-growing market, opening up completely new product and manufacturing options for customers and industry. The newly developed SEAM process significantly extends the options for the efficient manufacture of printed components. An impression of this is conveyed by the example of a fiber-reinforced clamping fixture

Neuartige Hybridbauweisen durch Kombination von Textilhalbzeugen und additiv gefertigten Strukturen

Durch die Entwicklung eines extrusionsbasierten 3D-Druckverfahren (SEAM) konnten Steigerungen der Prozessgeschwindigkeit dadurch erreicht werden, dass Plastifizierleistungen und Verfahrgeschwindigkeiten der Bauplattform weit über die üblichen Grenzen hinaus betrieben werden. Dabei ist es ebenso möglich variable Strangbreiten zu fahren, als auch Standardgranulate zu verwenden. Die so hergestellten Bauteile haben dabei einen hohen Kostenvorteil, stark reduzierte Bauzeiten und erreichen bis zu 80% der mechanischen Eigenschaften spritzge-gossener Bauteile. In dieser Studie wurden mittels des SEAM-Verfahren hybride 3D-Druckbauteile mit unidirektionaler Kohlenstofffaserverstärkung hergestellt. Die Haftung und deren Haupteinflussparameter wurden in Schälprüfungen und durch Schliffbildaufnahmen bewertet

Vorrichtung zur Beeinflussung des Volumenstroms von extrudiertem plastisch verformbaren Werkstoff:

In the device for influencing the volumetric flow of extruded plastically deformable material, the latter is conveyed to an outlet nozzle during the additive manufacturing of components. There is a flange (1) which is arranged between an extrusion unit and an outlet nozzle (3) and is connected to the extrusion unit and the outlet nozzle (3). A duct (10) designed to start from the extrusion unit and end at the outlet nozzle (3) is incorporated in the flange (1). In the flange (1), a piston (2) is mounted so as to be rotatable perpendicular to the longitudinal axis of the duct (10) and is guided through the duct (10). In the piston (2) there is formed a hole (8) which opens into a bypass duct (9) which is routed to a bypass nozzle (5). On the outer lateral surface of the piston (2) there is formed at least one groove (2.1) in the region of the duct (10) in such a way that, depending on the angular positions of the piston (1), material (6) can be conveyed through the groove (2.1) in the direction of the outlet nozzle (3) and/or through the hole (8) out of the bypass nozzle (5)

Regel- und Verschlusseinrichtung für extrudierten plastisch verformbaren Werkstoff

In the control and closure device, a duct (7) through which material (5) can be conveyed to the outlet nozzle is routed through the flange (1). Two pistons (2) are guided into the duct on two opposite sides. At least one piston (2, 3) is mounted and guided in a translationally movable and/or rotatable manner. In one of the pistons (2, 3) there is formed an opening which opens into a duct (6) which is routed through said piston (2, 3) and which in turn opens into a bypass nozzle (4). On the outer lateral surface of the at least one piston (2, 3) there is formed a groove (8) through which material can be conveyed in the direction of the outlet nozzle. The piston (2, 3) can be rotated in such a way that there is a connection to the outlet nozzle. The free cross section is changed during a translational and/or rotational movement of the piston (2, 3). A piston (2, 3) can be rotated in such a way that control of the volumetric flow of the material (5) passing through the duct (7) can be achieved. Upon closure of the duct (7), the opening can be positioned such that material (5) can be conveyed

Longitudinal Multi-omics Analyses Identify Responses of Megakaryocytes, Erythroid Cells, and Plasmablasts as Hallmarks of Severe COVID-19.

Temporal resolution of cellular features associated with a severe COVID-19 disease trajectory is needed for understanding skewed immune responses and defining predictors of outcome. Here, we performed a longitudinal multi-omics study using a two-center cohort of 14 patients. We analyzed the bulk transcriptome, bulk DNA methylome, and single-cell transcriptome (>358,000 cells, including BCR profiles) of peripheral blood samples harvested from up to 5 time points. Validation was performed in two independent cohorts of COVID-19 patients. Severe COVID-19 was characterized by an increase of proliferating, metabolically hyperactive plasmablasts. Coinciding with critical illness, we also identified an expansion of interferon-activated circulating megakaryocytes and increased erythropoiesis with features of hypoxic signaling. Megakaryocyte- and erythroid-cell-derived co-expression modules were predictive of fatal disease outcome. The study demonstrates broad cellular effects of SARS-CoV-2 infection beyond adaptive immune cells and provides an entry point toward developing biomarkers and targeted treatments of patients with COVID-19