The Role of Inclusions in the Failure of Boron Carbide Subjected to Impact Loading

2019 ◽  
Author(s):  
Andrew L. Tonge ◽  
Brian E. Schuster
Keyword(s):  
Boron Carbide ◽  
Impact Loading ◽  
Inelastic Deformation ◽  
Flyer Plate ◽  
Plate Impact ◽  
Simple Loading ◽  
Early Stages ◽  
Experimental Geometry

Abstract This work investigates the importance of the microstructure of boron carbide for initiating inelastic deformation under impact conditions. Simple loading resulting from a flyer plate impact geometry is used to illustrate the importance of microstructure for the well-controlled and easily instrumented experimental geometry. A second set of simulations is performed on a miniaturized impact geometry to investigate the importance of the microstructure for the early stages of semi-infinite penetration for impact velocities between 0.9 km/s and 1.9 km/s. The effect of the microstructure is more pronounced for the flyer plate impact geometry.

Injecting Knowledge

2017 ◽  
Author(s):  
Lucia Dacome
Keyword(s):  
Eighteenth Century ◽  
Blood Vessels ◽  
Comparative Perspective ◽  
Anatomical Models ◽  
Early Stages ◽  
The Creation ◽  
Cabinet Of Curiosities

Chapter 7 furthers the analysis of the role of anatomical models as cultural currencies capable of transferring value. It does so by expanding the investigation of the early stages of anatomical modelling to include a new setting. In particular, it follows the journey of the Palermitan anatomist and modeller Giuseppe Salerno and his anatomical ‘skeleton’—a specimen that represented the body’s complex web of blood vessels and was presented as the result of anatomical injections. Although Salerno was headed towards Bologna, a major centre of anatomical modelling, he ended his journey in Naples after the nobleman Raimondo di Sangro purchased the skeleton for his own cabinet of curiosities. This chapter considers the creation and viewing of an anatomical display in di Sangro’s Neapolitan Palace from a comparative perspective that highlights how geography and locality played an important part in shaping the culture of mid-eighteenth-century anatomical modelling.

Limited Influence? The Role of the Party of European Socialists in Shaping Social Democracy in Central and Eastern Europe

2011 ◽  
Vol 46 (1) ◽  
pp. 32-55 ◽  
Author(s):  
Michael Holmes ◽  
Simon Lightfoot
Keyword(s):  
Eastern Europe ◽  
Central And Eastern Europe ◽  
Social Democracy ◽  
Social Democratic ◽  
Academic Literature ◽  
Early Stages ◽  
European Norm ◽  
Democratic Parties ◽  
Social Democratic Parties

AbstractThis article looks at the role of the Party of European Socialists (PES) in its attempts to shape social democratic parties in Central and Eastern Europe (CEE) towards a West European norm. It discusses how existing views in the academic literature on the role of transnational parties are inadequate. We argue that the PES did not play a key role in encouraging the establishment and development of parties in the CEE states from the 2004 enlargement in the early stages of accession. We contend that the overall influence of party federations has been limited, and that these limitations were as much in evidence before enlargement took place as they were afterwards.

Dominant role of interface over knee angle for cushioning impact loading and regulating initial leg stiffness

1996 ◽  
Vol 29 (12) ◽  
pp. 1523-1529 ◽  
Author(s):  
Mario A. Lafortune ◽  
Ewald M. Hennig ◽  
Mark J. Lake
Keyword(s):  
Impact Loading ◽  
Dominant Role ◽  
Knee Angle ◽  
Leg Stiffness

The role of digital artefacts in early stages of distributed innovation processes

2021 ◽  
Vol 50 (10) ◽  
pp. 104349
Author(s):  
Markus C. Becker ◽  
Francesco Rullani ◽  
Francesco Zirpoli
Keyword(s):  
Early Stages ◽  
Innovation Processes

scholarly journals A Gnotobiotic Model to Examine Plant and Microbiome Contributions to Survival under Arsenic Stress

2020 ◽  
Vol 9 (1) ◽  
pp. 45
Author(s):  
María del Carmen Molina ◽  
James F. White ◽  
Sara García-Salgado ◽  
M. Ángeles Quijano ◽  
Natalia González-Benítez
Keyword(s):  
Seedling Growth ◽  
Endophytic Bacteria ◽  
Root Hairs ◽  
Resistant Bacteria ◽  
Relative Importance ◽  
Early Stages ◽  
Bacterial Interaction ◽  
Arsenic Stress ◽  
Free Media

So far, the relative importance of the plant and its microbiome in the development of early stages of plant seedling growth under arsenic stress has not been studied. To test the role of endophytic bacteria in increasing plant success under arsenic stress, gnotobiotic seeds of J. montana were inoculated with two endophytic bacteria: Pantoea conspicua MC-K1 (PGPB and As resistant bacteria) and Arthrobacter sp. MC-D3A (non-helper and non-As resistant bacteria) and an endobacteria mixture. In holobiotic seedlings (with seed-vectored microbes intact), neither the capacity of germination nor development of roots and lateral hairs was affected at 125 μM As(V). However, in gnotobiotic seedlings, the plants are negatively impacted by absence of a microbiome and presence of arsenic, resulting in reduced growth of roots and root hairs. The inoculation of a single PGPB (P. conspicua-MCK1) shows a tendency to the recovery of the plant, both in arsenic enriched and arsenic-free media, while the inoculation with Arthrobacter sp. does not help in the recovery of the plants. Inoculation with a bacterial mixture allows recovery of plants in arsenic free media; however, plants did not recover under arsenic stress, probably because of a bacterial interaction in the mixture.

Contriving and Assessment of Magnesium Alloy Composites Augmented with Boron Carbide VIA Liquid Metallurgy Route

2022 ◽  
Vol 1048 ◽  
pp. 3-8
Author(s):  
J. Allen Jeffrey ◽  
S. Suresh Kumar ◽  
V. Anusha Roseline ◽  
A. Lazar Mary ◽  
D. Santhosh
Keyword(s):  
Boron Carbide ◽  
Testing Machine ◽  
High Strength ◽  
Stir Casting ◽  
Vital Role ◽  
Magnesium Metal ◽  
Hardness Tester ◽  
Universal Testing ◽  
Modern Engineering

In modern engineering low-density composites plays a vital role of which magnesium alloys are very effective due to its high strength with better corrosion resistance and neat cast ability. In this work a micron sized Boron carbide ceramic (B4C) of about 100 microns is diffused as a reinforcement with AZ91 for preparing a magnesium metal matrix composite (MMMC) through stir casting route. A modified pit furnace setup is used for doing stir casting with varying volume fractions of 0％ and 3% of boron carbide for doing the composites. Furthermore mechanical and metallurgical properties like Tensile test is made through universal testing machine, Micro-hardness through Vickers hardness tester and Micro structure through Optical Microscopy is done for investigation.

Conserved segmental expression of Krox-20 in the vertebrate hindbrain and its relationship to lineage restriction

Development ◽  
1991 ◽  
Vol 113 (Supplement_2) ◽  
pp. 59-62 ◽  
Author(s):  
M. Angela Nieto ◽  
Leila C. Bradley ◽  
David G. Wilkinson
Keyword(s):  
Expression Pattern ◽  
Zinc Finger ◽  
Cell Lineage ◽  
Zinc Finger Gene ◽  
Early Stages ◽  
Cellular Events ◽  
Early Expression ◽  
Segmental Expression

The zinc-finger gene Krox-20 is expressed in two alternating segments, rhombomeres (r) 3 and 5, in the developing mouse hindbrain. This expression pattern is established prior to rhombomere formation in the mouse, but it is not known how the timing of expression relates to cellular events of segmentation, such as lineage restriction. We have cloned Krox-20 sequences from Xenopus and the chick and shown that its alternating expression pattern is conserved in these systems, suggesting that its role in hindbrain development is conserved. Analysis of the early stages of Krox-20 expression in the chick show that both domains of expression precede the restriction of cell lineage to specific rhombomeres, consistent with a role of this gene in early events of hindbrain segmentation. The finding that expression is not coincident with lineage restriction indicates that early expression may not reflect an irreversible commitment of cells to r3 and r5 and/or may be mosaic.

scholarly journals The Role of β-Adrenergic Overstimulation in the Early Stages of Renal Injury

2017 ◽  
Vol 42 (6) ◽  
pp. 1277-1289 ◽  
Author(s):  
Mariana Charleaux de Ponte ◽  
Fernando Augusto Malavazzi Casare ◽  
Juliana Martins Costa-Pessoa ◽  
Vanessa Gerolde Cardoso ◽  
Gerhard Malnic ◽  
...  
Keyword(s):  
Renal Injury ◽  
Early Stages
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