scholarly journals An Early Devonian permineralized rhyniopsid from the Battery Point Formation of Gaspé (Canada)

2017 ◽  
Author(s):  
Kelly C. Pfeiler ◽  
Alexandru M.F. Tomescu
Keyword(s):  
North America ◽  
Thin Layer ◽  
Surface Area ◽  
Water Transfer ◽  
Serial Sections ◽  
Cross Sectional ◽  
Early Devonian ◽  
The Cross ◽  
Sectional Surface

AbstractThe Emsian deposits of the Battery Point Formation (GaspéCanada) host the most diverse Early Devonian flora in North America. While most of this diversity has been described from plant compressions, the permineralized component of the flora is incompletely explored. Based on >15 axes studied in serial sections, we describe a new anatomically preserved rhyniopsid from the Battery Point Formation, Eddianna gaspiana gen. & sp. nov.. Eddianna axes are up to 2 mm in diameter and have a well-developed terete xylem strand with potential centrarch maturation (comprising 80% of the cross sectional surface area) that features Sennicaulis-type tracheid wall thickenings. A thin layer interpreted as phloem is preserved around the central xylem and an irregular sclerenchymatous cortex forms longitudinal anastomosing ridges on the outside of the axes. The anatomy of Eddianna axes suggests that they represent lower portions, specialized in efficient water transfer, of a larger plant whose distal regions have yet to be discovered. Eddianna, the first permineralized rhyniopsid described from the Battery Point Formation, is one of only four anatomically preserved plants reported from this unit. These fossils reiterate the potential for additional discoveries of anatomically preserved plants in the Battery Point Formation.

Tunneling spectroscopy of an indium adatom precisely manipulated on the cross-sectional surface of InAs/GaSb quantum structures

2019 ◽  
Vol 100 (23) ◽  
Author(s):  
Kyoichi Suzuki ◽  
Koji Onomitsu ◽  
Kiyoshi Kanisawa
Keyword(s):  
Tunneling Spectroscopy ◽  
Quantum Structures ◽  
Cross Sectional ◽  
The Cross ◽  
Sectional Surface

scholarly journals Microanalysis of the Cross-sectional Surface of 3D Printed NiMnGa Magnetic Shape Memory Alloy Using Electron Microscopy and Nanoindentation

2020 ◽  
Vol 26 (S2) ◽  
pp. 2208-2210
Author(s):  
Constantin Solomon ◽  
Yash Trivedi ◽  
Christopher Bansah ◽  
Matthew Caputo
Keyword(s):  
Electron Microscopy ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Magnetic Shape Memory ◽  
Cross Sectional ◽  
Magnetic Shape Memory Alloy ◽  
3D Printed ◽  
The Cross ◽  
Sectional Surface

C6-P-03Development of a cryo-SEM system enabling direct observation of the cross-sectional surface of an emulsion adhesive in frozen-hydrated state

Microscopy ◽  
2015 ◽  
Vol 64 (suppl 1) ◽  
pp. i141.2-i141
Author(s):  
Yoshiko Ito ◽  
Ayumi Ishihara ◽  
Yuri Nishino ◽  
Atsuo Miyazawa
Keyword(s):  
Direct Observation ◽  
Cross Sectional ◽  
The Cross ◽  
Sectional Surface

Risk of esophageal variceal bleeding based on endoscopic ultrasound evaluation of the sum of esophageal variceal cross-sectional surface area

2003 ◽  
Vol 98 (2) ◽  
pp. 454-459 ◽  
Author(s):  
Larry Miller ◽  
Felice L. Banson ◽  
Khalid Bazir ◽  
Anapurna Korimilli ◽  
J.i-Bin Liu ◽  
...  
Keyword(s):  
Surface Area ◽  
Endoscopic Ultrasound ◽  
Variceal Bleeding ◽  
Esophageal Variceal ◽  
Cross Sectional ◽  
Esophageal Variceal Bleeding ◽  
Ultrasound Evaluation ◽  
Sectional Surface

Surface properties of disordered γ MnO2 at the solid-electrolyte interface.

2002 ◽  
Vol 756 ◽  
Author(s):  
Bénédicte Prélot ◽  
Christiane Poinsignon ◽  
Fabien Thomas ◽  
Frédéric Villiéras
Keyword(s):  
Surface Area ◽  
Surface Properties ◽  
Structural Model ◽  
Active Surface ◽  
Structural Defects ◽  
Active Surface Area ◽  
Transition Elements ◽  
Cross Sectional ◽  
Solution Interface ◽  
Sectional Surface

ABSTRACTRelationships between lattice parameters of manganese dioxides (γ/ε-MD) and their surface properties at the solid-aqueous solution interface were investigated. The studied series ranged from orthorhombic ramsdellite to tetragonal pyrolusite and encompassed disordered MD samples. The structural model used takes into account two structural defects which affect the orthorhombic network of ramsdellite: Pr (rate of pyrolusite intergrowth) and Tw (rate of microtwinning). Water adsorption isotherms showed that the cross sectional surface area of water molecules is linearly correlated to Pr: from 6.3 Å2 (Pr=0.2) to 13.1 Å2 (Pr=1). Titration of their surface charge evidenced a linear relationship between PZC and Pr starting from ramsdellite (Pr = 0, Tw = 0, PZC = 1) to pyrolusite (Pr = 1, Tw = 0, PZC = 7.3). γ-MD with intermediate values of Pr (0.2 to 0.45) have increasing PZC values. For similar Pr values (0.45), high Tw percentage (0.3 and 1) makes the PZC to increase. The experimental results are compared with data collected in the literature for dioxides of transition elements with tetragonal structure. Surface titration leads to the determination of electrochemically active surface area at alkaline pH.

Fabrication of bulk aluminum-graphene nanocomposite through friction stir alloying

2019 ◽  
Vol 54 (1) ◽  
pp. 45-60 ◽  
Author(s):  
Abhishek Sharma ◽  
Vyas Mani Sharma ◽  
Jinu Paul
Keyword(s):  
Reference Material ◽  
Graphene Nanoplatelets ◽  
Aluminum Plate ◽  
Cross Sectional ◽  
Graphene Nanoplatelet ◽  
Characterization Methods ◽  
Friction Stir ◽  
Atomic Force ◽  
The Cross ◽  
Sectional Surface

Friction stir alloying is primarily employed for the fabrication of surface composite to improve surface properties like hardness, wear resistance, and corrosion resistance without significantly affecting the bulk properties of the alloy. The present study demonstrates the novel method for the fabrication of bulk aluminum-graphene nanoplatelets composite by using friction stir alloying. Here, the novelty is shown through the method of graphene nanoplatelets incorporation in the stir zone. For this purpose, a channel is fabricated on the cross-sectional surface of the aluminum plate and filled with graphene nanoplatelets. It is then covered by the cross-sectional surface of another aluminum plate of same dimensions and friction stir alloying is carried out. Reference material (RM) is also fabricated at the same parameters without any graphene nanoplatelet reinforcements for the performance evaluation of the nanocomposite. The microhardness of the fabricated composite increased by ∼57% as compared to the reference material. However, the tensile strength of the fabricated Al-graphene nanoplatelet composites decreased marginally as compared to reference material. The strengthening of the composite is explained systematically by various mechanisms. The results of microhardness and tensile test were corroborated with various characterization methods such as optical micrographs, scanning electron microscopy, atomic force microscope, and X-ray diffraction.

scholarly journals Radial Variation of Sound Absorption Capability in the Cross Sectional Surface of Yellow Poplar Wood

2011 ◽  
Vol 39 (4) ◽  
pp. 326-332 ◽  
Author(s):  
Chun-Won Kang ◽  
Youn-Hun Lee ◽  
Ho-Yang Kang ◽  
Wook Kang ◽  
Huiran Xu ◽  
...  
Keyword(s):  
Sound Absorption ◽  
Radial Variation ◽  
Poplar Wood ◽  
Yellow Poplar ◽  
Cross Sectional ◽  
The Cross ◽  
Sectional Surface

Development of multifunctional different cross-sectional shaped coaxial composite filaments for SMART textile applications

2016 ◽  
Vol 87 (16) ◽  
pp. 1991-2004 ◽  
Author(s):  
Ali Afzal ◽  
Jean-Yves Drean ◽  
Omar Harzallah ◽  
Nabyl Khenoussi ◽  
Sheraz Ahmad ◽  
...  
Keyword(s):  
Pure Copper ◽  
Resin Matrix ◽  
Design Parameters ◽  
Cross Sectional ◽  
Smart Textile ◽  
The Cross ◽  
Sectional Surface ◽  
Poly Ethylene ◽  
Sectional Shape

The aim of this study is to design a spinneret that can be used efficiently for the manufacturing of coaxial composite filaments. Poly(ethylene terephthalate) was used as resin matrix with 99.9% pure copper filament as the core. The characterization of the polymer was done to determine polymer thermal and rheological properties. Multi-shaped coaxial composite filaments were obtained after successful laboratory-scale melt extrusion machine modification and spinneret development. The cross-sectional surface and shape were analyzed with a scanning electron microscope. Coaxial filaments having the cross-section including elliptical, triangular, rectangular and circular shapes were developed. The characterization of spinneret design and coaxial composite filaments were also reported. The effect of spinneret design parameters on the cross-sectional shape of the filament were analyzed.

Recent Development and Application of the XSTM

1998 ◽  
Vol 05 (03n04) ◽  
pp. 797-802 ◽  
Author(s):  
H. Hirayama ◽  
Y. Einaga ◽  
M. Koike ◽  
K. Takayanagi
Keyword(s):  
Cross Section ◽  
Scanning Tunneling Microscope ◽  
Scanning Tunneling ◽  
Local Surface ◽  
Cross Sectional ◽  
Sample Bias ◽  
Disordered Phase ◽  
The Cross ◽  
Sectional Surface ◽  
Stm Images

The development of the cross-section scanning tunneling microscope (XSTM) and its application to the study of the cross-section of boron(B)-implanted Si wafers are reported. To obtain a cross-section of wafer samples, we examined the cleavage on the {111} plane in two ways. As a result the cleavage, by pushing the side of the sample wafer, was found to be preferable in obtaining a flat {111} cross-section from both (111) and (001) wafers. Our devices in the mounting angle and the guiding line for the cleavage are also described in detail, Using this XSTM, we observed the {111} cleaved cross-sectional surface of the B-implanted Si(111) wafer, The local surface structure was found to change on the cleaved cross-section from the 7 × 7 to the [Formula: see text] reconstruction through the disordered phase, The change was found to be consistent with the depth profile of the implanted B in the Si water. The arrangement of B and Si atoms in the disordered phase was determined by the site and the sample bias dependence of protrusions in STM images.

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