Academic literature on the topic 'SH hydrates'

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Journal articles on the topic "SH hydrates"

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Daghash, Shaden M., Phillip Servio, and Alejandro D. Rey. "From Infrared Spectra to Macroscopic Mechanical Properties of sH Gas Hydrates through Atomistic Calculations." Molecules 25, no. 23 (2020): 5568. http://dx.doi.org/10.3390/molecules25235568.

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The vibrational characteristics of gas hydrates are key identifying molecular features of their structure and chemical composition. Density functional theory (DFT)-based IR spectra are one of the efficient tools that can be used to distinguish the vibrational signatures of gas hydrates. In this work, ab initio DFT-based IR technique is applied to analyze the vibrational and mechanical features of structure-H (sH) gas hydrate. IR spectra of different sH hydrates are obtained at 0 K at equilibrium and under applied pressure. Information about the main vibrational modes of sH hydrates and the fac
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Daghash, Shaden, Phillip Servio, and Alejandro Rey. "First-Principles Elastic and Anisotropic Characteristics of Structure-H Gas Hydrate under Pressure." Crystals 11, no. 5 (2021): 477. http://dx.doi.org/10.3390/cryst11050477.

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Evaluating gas hydrates properties contributes valuably to their large-scale management and utilization in fundamental science and applications. Noteworthy, structure-H (sH) gas hydrate lacks a comprehensive characterization of its structural, mechanical, and anisotropic properties. Anisotropic and pressure dependent properties are crucial for gas hydrates’ detection and recovery studies. The objective of this work is the determination of pressure-dependent elastic constants and mechanical properties and the direction-dependent moduli of sH gas hydrates as a function of guest composition. Firs
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BELOSLUDOV, V. R., O. S. SUBBOTIN, R. V. BELOSLUDOV, H. MIZUSEKI, Y. KAWAZOE, and J. KUDOH. "THERMODYNAMICS AND HYDROGEN STORAGE ABILITY OF BINARY HYDROGEN + HELP GAS CLATHRATE HYDRATE." International Journal of Nanoscience 08, no. 01n02 (2009): 57–63. http://dx.doi.org/10.1142/s0219581x0900589x.

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Storage of hydrogen as hydrogen hydrate is a promising alternative technology to liquefied hydrogen at cryogenic temperatures or compressed hydrogen at high pressures. In this paper, computer simulation is performed based on the solid solution theory of clathrates of van der Waals and Platteeuw with some modifications that include in particular the account of multiple cage occupancies and host relaxation. The quasiharmonic lattice dynamics method employed here gives the free energy of clathrate hydrate to first order in the anharmonicity of intermolecular potential and permits to take into acc
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Imasato, Kazuki, Kotaro Murayama, Satoshi Takeya, Saman Alavi, and Ryo Ohmura. "Effect of nitrogen atom substitution in cyclic guests on properties of structure H clathrate hydrates." Canadian Journal of Chemistry 93, no. 8 (2015): 906–12. http://dx.doi.org/10.1139/cjc-2014-0553.

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The effect of substituting nitrogen heteroatoms in the cyclohexane ring of methylcyclohexane on the structure and guest dynamics of structure H (sH) clathrate hydrates with methane help gases are studied through experimental synthesis, powder X-ray diffraction (PXRD) measurements, and classical molecular dynamics simulation of methylcyclohexane and 1-methylpiperidine. The PXRD measurements were performed for temperatures in the range of 138 to 183 K, and the a axis and c axis lattice constants were determined in this temperature range. The PXRD results show the different thermal expansivity of
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Martín, Ángel, and Cor J. Peters. "Hydrogen Storage in sH Clathrate Hydrates: Thermodynamic Model." Journal of Physical Chemistry B 113, no. 21 (2009): 7558–63. http://dx.doi.org/10.1021/jp8074578.

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Fuseya, Go, Satoshi Takeya, and Akihiro Hachikubo. "Retracted Article: Effect of temperature and large guest molecules on the C–H symmetric stretching vibrational frequencies of methane in structure H and I clathrate hydrates." RSC Advances 8, no. 6 (2018): 3237–42. http://dx.doi.org/10.1039/c7ra12334e.

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Fuseya, Go, Satoshi Takeya, and Akihiro Hachikubo. "Effect of temperature and large guest molecules on the C–H symmetric stretching vibrational frequencies of methane in structure H and I clathrate hydrates." RSC Advances 10, no. 30 (2020): 17473–78. http://dx.doi.org/10.1039/d0ra02748k.

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Papadimitriou, N. I., I. N. Tsimpanogiannis, C. J. Peters, A. Th Papaioannou, and A. K. Stubos. "Hydrogen Storage in sH Hydrates: A Monte Carlo Study." Journal of Physical Chemistry B 112, no. 45 (2008): 14206–11. http://dx.doi.org/10.1021/jp805906c.

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Dobrzycki, Łukasz, Kamila Pruszkowska, Roland Boese, and Michał K. Cyrański. "Hydrates of Cyclobutylamine: Modifications of Gas Clathrate Types sI and sH." Crystal Growth & Design 16, no. 5 (2016): 2717–25. http://dx.doi.org/10.1021/acs.cgd.5b01846.

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Duarte, Ana Rita C., Alireza Shariati, and Cor J. Peters. "Phase Equilibrium Measurements of Structure sH Hydrogen Clathrate Hydrates with Various Promoters†." Journal of Chemical & Engineering Data 54, no. 5 (2009): 1628–32. http://dx.doi.org/10.1021/je800993w.

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Dissertations / Theses on the topic "SH hydrates"

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Lee, Jong-won, Hailong Lu, Igor L. Moudrakovski, Christopher I. Ratcliffe, and John A. Ripmeester. "NEW FINDINGS ON GUEST ENCLATHRATION IN STRUCTURE-H HYDRATES BY MEANS OF THERMODYNAMIC AND SPECTROSCOPIC ANALYSIS." 2008. http://hdl.handle.net/2429/1099.

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Among the three common gas hydrate structures, structure-H (sH) hydrate has been regarded as forming only in the laboratory since it was first reported in 1987. However, natural gas hydrate samples obtained from the Cascadia margin showed that sH hydrate can form naturally. Not only was the sH hydrate found in natural samples, but it was also discovered that n-alkanes such as n-pentane and n-hexane, considered to have too large molecular size to be sH hydrate formers, can act as co-guests of sH hydrates in mixtures with other sH hydrate formers. In this study, thermodynamic measurements and sp
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Conference papers on the topic "SH hydrates"

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Song, Yongchen, Baixin Chen, Masahiro Nishio, and Makato Akai. "Experimental Study of Dissolution Rate of a CO2 Droplet and CO2 Solubility in High Pressure and Low Temperature Seawater With Hydrate Free." In ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/omae2004-51133.

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Against the background of carbon dioxide (CO2) ocean sequestration technology, we investigated the solubility of CO2 in seawater at a thermodynamic state similar to that at an ocean depth of 1000 m. The experiment was performed in two steps. In the first step, we reexamined and modified the fundamental relationship between Sherwood (Sh) number and Rayleigh (Ra) number in a natural convective flow over an up-down CO2 droplet. We derived a new expression of the Grashof number for CO2 dissolution in water and seawater with the aid of the relation between the density of CO2 solution and CO2 concen
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