Results 131 to 140 of about 4,032,505 (279)

Revealing the Nanoscale Morphology Changes of Polymer Electrolyte Membrane Fuel Cell Catalyst Layers due to Conditioning

Advanced Science, EarlyView.
We apply ex situ and in situ scanning transmission X‐ray microscopy to reveal the structural degradation of polymer electrolyte membrane fuel cell catalyst layers due to conditioning and thermal heating of the catalyst coated membrane. We observe a redistribution of the ionomer and carbon‐black in the catalyst layer, as well as nanoscale membrane ...
Spencer Lytle, Harsharaj B. Parmar, Jian Wang, Shohei Yamashita, Aimy Bazylak   +4 more
wiley   +1 more source

High-pressure neutron diffraction at ultra-low temperature

Physical Review Research
Neutron diffraction is a powerful tool in the study of quantum materials and associated emergent phenomena as it allows for direct detection of magnetic structure even at ultra-low temperatures.
Y. Wu, T. E. Sherline, J. J. Molaison, A. M. dos Santos, H. D. Zhou, H. B. Cao, J. J. Pierce, B. Haberl   +7 more
doaj   +1 more source

6.1% Volumetric Negative Thermal Expansion Induced by the Reversible Reconstructive Phase Transition in Pb‐Free Bi1−xLnxCoO3 (Ln: Lanthanoid)

Advanced Science, EarlyView.
Perovskite‐type oxide lanthanoid‐substituted BiCoO3 exhibits a reversible negative thermal expansion (NTE) originated from the coordination change from the CoO5 pyramid to the CoO6 octahedron due to melting of the dxy orbital ordering in the d6 electron configuration, and the 6.1% volume shrinkage in Bi0.82Nd0.18CoO3 is the largest ever observed in the
Yuki Sakai, Kazuki Takahashi, Shogo Wakazaki, Takumi Nishikubo, Jun Miyake, Takehiro Koike, Teppei Nagase, Takafumi Yamamoto, Kano Hatayama, Masaichiro Mizumaki, Masaki Azuma   +10 more
wiley   +1 more source

Research on neutron diffusion coupling calculation based on the UDS and UDF functions of FLUENT and its application analysis on fast reactor

四川大学学报. 自然科学版, 2020
With the great improvement of computer performance, analyzing the complex flow and heat transfer phenomenon by coupling CFD and neutronics has attracted lots of attentions nowadays. The study aims to investigate the neutron diffusion coupling calculation
ZHANG Xue-Bei, WANG Chi, CHEN Hong-Li
doaj  

Ethane as a Neutron Moderator at Cryogenic Temperatures

EPJ Web of Conferences
The study’s objective is to examine the neutron temperature response, using liquid and solid ethane at various cryogenic temperatures to evaluate the effectiveness of ethane as a cold neutron moderator in compact moderator systems. The experimental measurements were carried out at temperatures of 170 K, 135 K, 100 K, 70 K, 50 K, 25 K, 15 K, and 10 K ...
El Barbari, Monia, Rücker, Ulrich, Schwab, Alexander, Chen, Junyang, Zakalek, Paul, Li, Jingjing, Gutberlet, Thomas, Brückel, Thomas   +7 more
openaire   +3 more sources

Sticker Valence Governs Chain Collapse and Liquid‐Liquid Phase Separation in Peptide‐Inspired Associative Polymers

Advanced Science, EarlyView.
Peptide‐inspired associative polymers with arginine‐like guanidinium stickers and lysine‐like ammonium spacers undergo chain collapse and liquid‐liquid phase separation induced by reversible sticker associations. Sticker valence and tunable association strength jointly control the phase behavior, chain conformation, and interfacial cohesion of these ...
Seung‐Hwan Oh, Jinhoon Lee, Seunghyun Lee, Raehyun Jung, Sangyeop Lee, Su‐Mi Hur, Dong Woog Lee, Soo‐Hyung Choi   +7 more
wiley   +1 more source

Operando Visualization of Cathode Water Management in Proton Exchange Membrane Water Electrolyzers Using Synchrotron X‐Ray Radiography

Advanced Science, EarlyView.
The cathode of proton exchange membrane water electrolyzers remains a poorly understood region despite its importance for hydrogen purity and operational safety. Operando synchrotron X‐ray radiography directly visualizes liquid water behavior and uncovers a transition from continuous to pulsating transport, providing new insight into multiphase ...
Wataru Yoshimune, Tetsuichiro Hayakawa, Yuta Miyase   +2 more
wiley   +1 more source

A high-resolution neutron diffraction and electron diffraction study of the structure and phase transitions in AgTaO3

APL Materials
The high temperature phase transition behavior of the quantum paraelectric material, AgTaO3, has previously been debated in the literature. To elucidate the phase transitions of AgTaO3, we used neutron powder diffraction and established the phase ...
J. W. B. Li, Bryce G. Mullens, Shuki Torii, Wenhai Ji, Zhenhong Tan, Wu Xie, Takashi Kamiyama, Ping Miao, Brendan J. Kennedy   +8 more
doaj   +1 more source

Wiederherstellung chiraler Symmetrie und des Deconfinements in Neutronensternen [PDF]

, 2009
Neutron stars are very dense objects. One teaspoon of their material would have a mass of five billion tons. Their gravitational force is so strong that if an object were to fall from just one meter high it would hit the surface of the respective neutron
Dexheimer, Verônica Antocheviz
core  

Effect of Finite-temperature β-decay Rates on the Rapid Neutron Capture Process

The Astrophysical Journal
β -decay is known to play an essential role in the rapid neutron capture process ( r -process) during ( n ,  γ ) ↔ ( γ ,  n ) equilibrium and freeze-out when the neutron-rich nuclei decay back to stability.
Yukiya Saito, Ante Ravlić, Pranav Nalamwar, Rebecca Surman   +3 more
doaj   +1 more source