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Displaying 201 - 225 of 1646

Assessing girth weld quality of pipeline steels and their susceptibility to hydrogen embrittlement

June 16, 2024
Author(s)
Zack Buck, Newell Moser, May Ling Martin, Nicholas Derimow, Damian Lauria, Enrico Lucon, Douglas Stalheim, Peter Bradley, Matthew Connolly
… Hydrogen is known to cause premature failure in various steel … understanding the susceptibility of these steels to hydrogen embrittlement and the effect of various … results of mechanical measurements performed in air and in hydrogen of girth welds used in pipeline steels. Fracture …

Alkali metal pyridinolate/piperidinolate pairs: A new type of materials for efficient reversible hydrogen storage

April 1, 2025
Author(s)
Alexis Munyentwali, Yang Yu, Xingchi Zhou, Wei Zhou, Qijun Pei, Khai Chen Tan, Anan Wu, Hui Wu, Teng He, Ping Chen
… Chemical hydrogen storage in organic materials is a promising method … This study proposes a strategy to design a new type of hydrogen storage materials, i.e., alkali metal … suitable dehydrogenation thermodynamics along with high hydrogen storage capacities. These air-stable compounds can …

Developing Ideal Metalorganic Hydrides for Hydrogen Storage: From Theoretical Prediction to Rational Fabrication

September 6, 2021
Author(s)
Zijun Jing, Qinqin Yuan, Yang Yu, Xiangtao Kong, Khai C. Tan, Jintao Wang, Qijun Pei, Xue-Bin Wang, Wei Zhou, Hui Wu, Anan Wu, Teng He, Ping Chen
… Materials for hydrogen storage have been extensively explored for a few decades. Thousands of hydrogen storage materials have been synthesized and tested, … hydrides, 20 of them were identified with both high hydrogen capacities (≥5 mass %) and suitable thermodynamics …

Competition Between Intra-and Inter-Molecular Hydrogen Bonding: Effect on Para/Ortho Adsorptive Selectivity for Substituted Phenols

February 1, 2000
Author(s)
A J. Glemza, K L. Mardis, A A. Chaudhry, M K. Gilson, G F. Payne
… small molecule ethyl propionate (EP) as an analogue of the hydrogen bond accepting site of the acrylic ester sorbent. … p-MHB and p-HAP bind to EP primarily via an intermolecular hydrogen bond to the carbonyl oxygen of EP. In contrast, o-MHB and o-HAP possess strong intramolecular hydrogen bonds that are retained upon complexation with EP. …

Medium-Term Frequency Stability of Hydrogen Masers as Measured by a Cesium Fountain

June 2, 2010
Author(s)
Thomas E. Parker, Steven R. Jefferts, Thomas P. Heavner
… Abstract Hydrogen masers are used extensively in time scale ensembles, … frequency stability (tau = 30 to 90 days) of six hydrogen masers. An unexpected observation was a moderate … atomic frequency standards, cesium fountain, hydrogen maser … Medium-Term Frequency Stability of Hydrogen Masers as Measured by a Cesium Fountain …

Ductility-driven ranking system for API-grade steels in high pressure gaseous hydrogen transmission pipelines

December 19, 2022
Author(s)
Douglas Stalheim, Andrew Slifka, Matthew Connolly, Enrico Lucon, Aaron Litschewski, Pello Uranga
… There is strong economic and environmental interest in hydrogen as an energy source to contribute to combatting climate change. Hydrogen diffusion into the steel with assistance through … fracture toughness and fatigue, through embrittlement or hydrogen induced cracking. Fracture toughness as a measure of …

Direct Measurement of Hydrogen Dislocation Pipe Diffusion in Deformed Polycrystalline Pd using Quasielastic Neutron Scattering

July 10, 2014
Author(s)
Brent J. Heuser, Dallas R. Trinkle, Niina Jalarvo, Joseph Serio, Eugene Mamontov, Madhu Sudan Tyagi
… The large incoherent neutron scattering cross section of hydrogen allows QENS measurements at the low solute … diffusion. We observe diffusion coefficients for trapped hydrogen elevated by one to two orders of magnitude above … polycrystalline Pd. For regular bulk diffusion of hydrogen in Pd we find D(T)=D o exp(-E z/kT)=0.006xp(-0.23 …

Hydrogen Dynamics in Ce 2 Fe 17 H 5 : Inelastic and Quasielastic Neutron Scattering Studies

September 21, 2011
Author(s)
Alexander V. Skripov, N. V. Mushnikov, P. B. Terent'ev, V. S. Gaviko, Terrence J. Udovic, John J. Rush
… The vibrational spectrum of hydrogen and parameters of H jump motion in the rhombohedral … and quasielastic neutron scattering. It is found that hydrogen atoms occupying interstitial Ce 2 Fe 2 sites … of 103plus and minus}3 meV. Our results suggest that the hydrogen jump rate in Th 2 Zn 17 -type compounds strongly …

Calcium and phosphate ion releasing composite: Effect of pH on release and mechanical properties

October 27, 2008
Author(s)
Hockin D. Xu, Michael Weir, Limin Sun
… this study was to develop a composite using tetracalcium phosphate (TTCP) fillers and whiskers to be stress-bearing, … and to be “smart” to increase the calcium (Ca) and phosphate (PO4) ion release at cariogenic pH. Methods. TTCP … dental composite, tetracalcium phosphate, particle size, mechanical properties, tooth caries …

Reaction Chromatography /Mass Spectrometry. 1. Gas chromatograph hydrogenation microreactor - mass Spectrometer system for the study of Olefins.

March 1, 1985
Author(s)
Anzor I. Mikaia, Vladimir Smetanin, Vladimir G. Zaikin
… of hydrogen as a carrier and reagent gas, the spectra of hydrogenation products provide information on the structure … GC-MS, Electron ionization, Olefins, Catalytic hydrogenation … Chromatography /Mass Spectrometry. 1. Gas chromatograph hydrogenation microreactor - mass Spectrometer system for the …

Hydrogen in nonstoichiometric cubic titanium monoxides: X-ray and neutron diffraction, neutron vibrational spectroscopy and NMR studies

December 1, 2021
Author(s)
A. V. Skripov, A. V. Soloninin, A. A. Valeeva, A. I. Gusev, A. A. Rempel, Hui Wu, Terrence J. Udovic
… Hydrogen-induced changes in the properties of … this structure can be attributed to the broken symmetry of hydrogen sites in the titanium monoxides: because of the … that both hydrogenated compounds are metallic; no signs of hydrogen diffusive motion in TiO0.72H0.30 and TiO0.96H0.14 at …

Electron- and Photon-Stimulated Desorption of Atomic Hydrogen From Radiation-Modified Alkali Halide Surfaces

October 1, 2000
Author(s)
Lawrence T. Hudson, N H. Tolk, C Bao, P Norlander, D P. Russell, J. Xu
… The desorption yields of excited hydrogen atoms from the sufaces of KCI, KBr, NaCl, NaF and … or photon bombardment, the fluorescence from excited hydrogen atoms ejected from the surface is monitored. The … hydride molecule/complex leading to the desorption of hydrogen atoms possessing several electron volts of kinetic …

Hydrogen Storage with Aluminum Formate, ALF: Experimental, Computational, and Technoeconomic Studies

September 28, 2023
Author(s)
Hayden Evans, Taner N. Yildirim, Peng Peng, Yongqiang Cheng, Zeyu Deng, Qiang Zhang, Dinesh Mullangi, Dan Zhao, Pieremanuele Canepa, Hanna M. Breunig, Anthony K. Cheetham, Craig Brown
… Long-duration storage of hydrogen is necessary for coupling renewable H2 with … performance for long-duration storage versus compressed hydrogen and leading metal−organic frameworks. In the TEA, it … Adsorption, Hydrogen storage, ALF … Hydrogen Storage with Aluminum Formate, ALF: Experimental, …

Correlation for the Viscosity of Hydrogen obtained from Symbolic Regression

March 27, 2013
Author(s)
Chris D. Muzny, Marcia L. Huber, Andrei F. Kazakov
… for a wide-ranging correlation for the viscosity of normal hydrogen. The correlation covers the temperature range from … hydrogen, symbolic regression, viscosity … Correlation for the Viscosity of Hydrogen obtained from Symbolic Regression …

Delicate Tuning of Reaction Thermodynamics via Formation of Bimetal Phenoxide: Synthesis, Structure, and Hydrogen Storage Performance

May 2, 2025
Author(s)
Nor I. Nordin, Khai C. Tan, Hong Wen, Xiaohua Ju, Wei Zhou, Hui Wu, Teng He, Ping Chen, Yong Chua
… Arene-cycloalkane pairs are promising for hydrogen storage but often encounter unfavorable … bimetal organic compounds show potential for vehicular hydrogen storage, demonstrating efficient hydrogen uptake at 90 °C and partial reversibility at 140 °C. … phenoxide, hydrogen storage, X-ray crystallography …
Displaying 201 - 225 of 1646
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