A new material classification of lossy metamaterials

2010 ◽  
Vol 53 (2) ◽  
pp. 445-447 ◽  
Author(s):  
Dong Hyun Lee ◽  
Wee Sang Park
Keyword(s):  
Material Classification ◽  
New Material

scholarly journals PoreAnalyzer—An Open-Source Framework for the Analysis and Classification of Defects in Additive Manufacturing

2021 ◽  
Vol 11 (13) ◽  
pp. 6086
Author(s):  
Nils Ellendt ◽  
Fabian Fabricius ◽  
Anastasiya Toenjes
Keyword(s):  
Additive Manufacturing ◽  
Open Source ◽  
Total Porosity ◽  
Shape Accuracy ◽  
Process Maps ◽  
Defect Type ◽  
Open Source Framework ◽  
New Material ◽  
High Cooling Rates

Additive manufacturing processes offer high geometric flexibility and allow the use of new alloy concepts due to high cooling rates. For each new material, parameter studies have to be performed to find process parameters that minimize microstructural defects such as pores or cracks. In this paper, we present a system developed in Python for accelerated image analysis of optical microscopy images. Batch processing can be used to quickly analyze large image sets with respect to pore size distribution, defect type, contribution of defect type to total porosity, and shape accuracy of printed samples. The open-source software is independent of the microscope used and is freely available for use. This framework allows us to perform such an analysis on a circular area with a diameter of 5 mm within 10 s, allowing detailed process maps to be obtained for new materials within minutes after preparation.

scholarly journals On the fossil Remains of Panochthus Burmeister, 1866 (Xenarthra, Cingulata, Glyptodontidae) from the Pleistocene of southern Brazil

2015 ◽  
Vol 87 (1) ◽  
pp. 15-27 ◽  
Author(s):  
José D. Ferreira ◽  
Martín Zamorano ◽  
Ana Maria Ribeiro
Keyword(s):  
South America ◽  
Rio Grande ◽  
Species Level ◽  
External Morphology ◽  
Latitudinal Distribution ◽  
Southern Brazil ◽  
Rio Grande Do Sul ◽  
Diagnostic Features ◽  
New Material

The genus Panochthus represents the last lineage of "Panochthini" recorded in the Pleistocene. This genus has a wide latitudinal distribution in South America, and in Brazil it occurs in the southern and northeastern regions. In this paper we describe new material (isolated osteoderms and caudal tube fragments) assigned to Panochthus from the state of Rio Grande do Sul (southern Brazil) and discuss some taxonomic issues related to Panochthus tuberculatus and Panochthus greslebini based on this material . The occurrence of P. greslebini is the first for outside the Brazilian Intertropical Region. In addition, we describe new diagnostic features to differentiate the osteoderms of P. greslebini and P. tuberculatus. Unfortunately, it was not possible to identify some osteoderms at the species level. Interestingly, they showed four distinct morphotypes characterized by their external morphology, and thus were attributed to Panochthus sp. Lastly, we conclude that in addition to P.tuberculatus registered to southern Brazil, there is another species of the genus, assignable to P. cf. P. greslebini. Our analysis reinforce the reliability of caudal tube characters for the classification of species of Panochthus.

Description of new chiactine-bearing sponges provides insights into the higher classification of Calcaronea (Porifera: Calcarea)

Zootaxa ◽  
2019 ◽  
Vol 4615 (2) ◽  
pp. 201
Author(s):  
ADRIANA ALVIZU ◽  
JOANA R. XAVIER ◽  
HANS TORE RAPP
Keyword(s):  
New Species ◽  
Phylogenetic Reconstruction ◽  
Molecular Data ◽  
Phylogenetic Study ◽  
Two New Species ◽  
Close Relationship ◽  
New Material ◽  
Relationship Of ◽  
The Antarctic

A recent phylogenetic study revealed a close relationship between chiactine-bearing (family Achramorphidae, order Leucosolenida) and pugiole-bearing (order Baerida) calcaronean sponges as well as new putative taxa within Achramorphidae. In this study, we present a revision of chiactine-bearing sponges based on morphological re-examination of type material and recently collected specimens, in addition to new molecular data for the ribosomal 18S and C-region of the 28S. We provide re-descriptions for all known chiactine-bearing species, and further describe two new species from the Antarctic (Achramorpha antarctica sp. nov. and Megapogon schiaparellii sp. nov.) and two new species and a new genus from the Nordic Seas (Achramorpha ingolfi sp. nov. and Sarsinella karasikensis gen. nov. sp. nov.). The new phylogenetic reconstruction based on ribosomal 18S and C-region of the 28S confirms previous findings about the close relationship of some members of Baerida and the family Achramorphidae of the order Leucosolenida. However, new material and the addition of molecular data from the type species of both taxa would be required to formally propose changes at (sub-)ordinal levels within the classification of Calcaronean sponges. 

Material classification of nanoparticles by focused beam scattering

2011 ◽  
Vol 50 (4) ◽  
pp. 434 ◽  
Author(s):  
Evyatar Hemo ◽  
Boris Spektor ◽  
Joseph Shamir
Keyword(s):  
Material Classification ◽  
Beam Scattering ◽  
Focused Beam

Energy Release Characteristics of Impact-Initiated Energetic Materials

2005 ◽  
Vol 896 ◽  
Author(s):  
Richard Ames
Keyword(s):  
Energy Release ◽  
Energetic Materials ◽  
High Strain ◽  
Polymer Binder ◽  
Dynamic Loads ◽  
Metal Powders ◽  
Static Loads ◽  
Material Classification ◽  
Plastic Deformation Process

AbstractImpact-initiated energetic materials are a class of energetic materials that are formulated to release energy under highly dynamic loads. Under quasi-static or static loads, however, the materials are intended to be inert and carry a material classification of 4.1 flammable solid. In general, these materials are formed by introducing metal powders into a polymer binder but a number of binderless varieties exist (primarily pressed/sintered intermetallics and thermites). Most of the materials are sufficiently insensitive so as not to produce a self-sustaining reaction; as such, they require the mechanical work of a high-strain-rate plastic deformation process to provide the energy required to drive the reaction. Traditional initiation techniques such as exploding bridge wires or flame initiation are not sufficient to maintain a reaction in this class of materials. This paper presents a brief overview of the energy release characteristics of this class of materials, including a discussion of the material formulations, initiation phenomena, and a discussion of the manner in which the material properties affect the energy release characteristics.

scholarly journals GEOGRAPHICAL KNOWLEDGE AND UNDERSTANDING AMONG 10TH GRADE STUDENTS

2020 ◽  
Vol 26 (1) ◽  
pp. 54-62
Author(s):  
Raimonda Samsonaitė
Keyword(s):  
Learning Process ◽  
Fossil Fuel ◽  
Current Level ◽  
Geographical Knowledge ◽  
Level Of Education ◽  
Geography Teaching ◽  
New Material ◽  
Grade Ii ◽  
Level Of Knowledge

In modern-day knowledge and deeper understanding has an exceptionally important role in forming a student’s erudition. In order for a student to achieve a proper level of education the tutoring must be systematically based on gathering knowledge in an academic environment. Unfortunately the students may sometimes forget or misinterpret the gathered information. Geography is no exception. During the learning process of said subject, it is often observed, that some students cannot properly understand the new material, because the current level of knowledge is insufficient. Thus it is critical to find out the level of students understanding at the present and pinpoint the missing gaps in previously gathered information. The analysis of the survey showed a significant gap between the students of two classes. The students of grade II showed not only the better level of knowledge and understanding, but also were more motivated to learn, compared to grade I. By examining the result of the test regarding natural recourses, few questions revealed the flaws in geographical understanding. A meaningful amount of the students showed poor special understanding: were unable to name the leading countries regarding natural recourses extraction. The struggle to clearly reason the answer also became apparent: the lack of knowledge in the field of geographical theory and concepts is most noticeable. For both tested classes, the easiest questions were regarding the analysis of data, students successfully pointed out the classification of natural resources as well as the pros/cons of using fossil fuel. Keywords: geography teaching, geographical understanding, learning process.

Changes in Material Classification of the Urinary Bladder Wall After Spinal Cord Injury

2002 ◽  
Author(s):  
D. Claire Gloeckner ◽  
Michael B. Chancellor ◽  
Michael S. Sacks
Keyword(s):  
Mechanical Properties ◽  
Spinal Cord ◽  
Spinal Cord Injury ◽  
Urinary Bladder ◽  
Constitutive Model ◽  
Bladder Wall ◽  
Material Classification ◽  
Cord Injury ◽  
Urinary Bladder Wall

Changes in the mechanical properties of the urinary bladder wall following neurogenic disease or trauma can result in bladder dysfunction. We have recently reported changes in the biaxial mechanical properties of the bladder wall 10 days after spinal cord injury in a rat model [1]. Development of a constitutive model to characterize these changes would facilitate quantitative comparisons and provide the necessary information for organ-level computational modeling. However, before an appropriate constitutive model of the bladder wall can be formulated, its material class must be identified. In the present study, we applied a generalized method for material classification of biaxial mechanical data to our previous data on the urinary bladder wall.

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