25 Result(s)
within
Article
Hyung-Won Lee
English
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Article
Supersymmetric inflationary universe
In this paper we show that inflation can take place under the requirement of maximal symmetry for the vacuum state as a supersymmetric compactification condition together with cosmological principles. We get a...
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Multipoint spatial correlation function on the self-similar observer homogeneous structure
We presented explicit forms of 2-and 3-point spatial correlation functions for observer homogeneous and self-similar structure. Our results have a little difference with the usual form in the 3-point case, but...
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Extremal black holes in the Hořava–Lifshitz gravity
We study the near-horizon geometry of extremal black holes in the z=3 Hořava–Lifshitz gravity with a flow parameter λ. For λ>1/2, near-horizon geometry of extremal black holes are AdS 2×S ...
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Slowly rotating black holes in the Hořava–Lifshitz gravity
We investigate slowly rotating black holes in the Hořava–Lifshitz (HL) gravity. For Λ W =0 and λ=1, we find a slowly rotating black hole of the Kehagias–...
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Equations of state in the Brans–Dicke cosmology
We investigate the Brans–Dicke (BD) theory with the potential as cosmological model to explain the present accelerating universe. In this work, we consider the BD field as a perfect fluid with the energy densi...
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On the Ricci dark energy model
We study the Ricci dark energy model (RDE) which was introduced as an alternative to the holographic dark energy model. We point out that an accelerating phase of the RDE is that of a constant dark energy mode...
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Open AccessCatalytic pyrolysis of Laminaria japonica over nanoporous catalysts using Py-GC/MS
The catalytic pyrolysis of Laminaria japonica was carried out over a hierarchical meso-MFI zeolite (Meso-MFI) and nanoporous Al-MCM-48 using pyrolysis gas chromatography/mass spectrometry (Py-GC/MS). The effect o...
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Future cosmological evolution in f(R) gravity using two equations of state parameters
We investigate the issues of future oscillations around the phantom divide (FOPD) for f(R) gravity. For this purpose, we introduce two types of energy density and pressure arisen from the f(R)-higher order curvat...
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Pyrolysis properties and kinetics of mandarin peel
The thermal property of the pyrolysis reaction of mandarin peel was studied using thermogravimetric analysis (TGA). Thermogravimetric analyses with temperature increases of 10, 20 and 40 °C/min showed large we...
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The application of Py-GC/MS for the catalytic upgrading of oil separated from summer food waste leachate
The catalytic cracking of oil fractions separated from summer food waste leachate was investigated over BEA zeolite and Al-SBA-15 catalysts. In this study, a mixture of food waste oil fractions and catalyst wa...
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Article
The absence of the Kerr black hole in the Hořava–Lifshitz gravity
We show that the Kerr metric does not exist as a fully rotating black hole solution to modified Hořava–Lifshitz (HL) gravity with Λ W =0 and λ=1. We do t...
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Open AccessPyrolysis and co-pyrolysis of Laminaria japonica and polypropylene over mesoporous Al-SBA-15 catalyst
The catalytic co-pyrolysis of a seaweed biomass, Laminaria japonica, and a typical polymer material, polypropylene, was studied for the first time. A mesoporous material Al-SBA-15 was used as a catalyst. Pyrolysi...
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Explaining dark energy with degenerate neutrino
Nowadays, most scientists believe that the universe is accelerating based on precise observational data[Astrophys. J. 607, 665 (2004); Phys. Rev. Lett. 83, 670 (1999)]. However, its explanation based on physical ...
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Non-Isothermal Pyrolysis of Citrus Unshiu Peel
In this study, the non-isothermal pyrolysis of citrus unshui (C. unshiu) peel was studied by thermogravimetric analysis (TGA) and evolved gas analysis/pyrolyzer-gas chromatography/mass spectrometry (EGA/Py-GC/MS)...
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Article
Identification of active transcriptional regulatory elements from GRO-seq data
Using data from global run-on and sequencing (GRO-seq) or related methods, the dREG software identifies a new class of transcriptional regulatory elements with strong evidence for directing active transcription.
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Removal of Cu2+ by biochars derived from green macroalgae
The by-product char of the fast pyrolysis of a green macroalga Enteromorpha compressa was used to remove copper from an aqueous solution. The surface area and the amount of cation exchange capacity (CEC) were inc...
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Pyrolysis kinetics and product properties of softwoods, hardwoods, and the nut shell of softwood
The pyrolysis of softwoods (Pinus (P.) densiflora, P. koraiensis), hardwoods (Quercus acutissima and Liriodendron tulipifera) and nut shell of P. koraiensis was investigated using a thermogravimetric analyzer and...
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Article
In-Situ Catalytic Pyrolysis of Xylan and Dealkaline Lignin over SAPO-11
Silicoaluminophosphate molecular sieve, SAPO-11, was applied for the first time to the catalytic pyrolysis of xylan and dealkaline lignin. The isothermal fast catalytic pyrolysis of xylan and dealkaline lignin...
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Production of biofuels from pine needle via catalytic fast pyrolysis over HBeta
The thermal and catalytic pyrolysis of pine needles over HBeta catalysts with different SiO2/Al2O3 ratios (25 and 300) were investigated by thermogravimetric analysis (TGA) and pyrolyzer-gas chromatography/mass s...
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Upgrading of bio-oil by ex-situ catalytic pyrolysis and in-line esterification in fluidized bed reactor
Ex-situ catalytic pyrolysis of Quercus mongolica over HZSM-5 and in-line esterification of pyrolysis/catalytic pyrolysis vapors with liquid phase n-butyl alcohol were carried out in a fluidized bed reactor. The e...
