629 research outputs found
Hydrogen deuterium exchange mass spectrometry data for paper titled "Electron cryo-microscopy structure of Ebola nucleoprotein reveals a mechanism for nucleocapsid-like assembly" CELL-D-17-02921
Hydrogen deuterium exchange mass spectrometry data for paper title "Electron cryo-microscopy structure of Ebola nucleoprotein reveals a mechanism for nucleocapsid-like assembly" CELL-D-17-0292
sj-pdf-1-jag-10.1177_07334648211042370 – Supplemental material for Bidirectional Association Between Depression and Hearing Loss: Evidence From the China Health and Retirement Longitudinal Study
Supplemental material, sj-pdf-1-jag-10.1177_07334648211042370 for Bidirectional Association Between Depression and Hearing Loss: Evidence From the China Health and Retirement Longitudinal Study by Chao Wu in Journal of Applied Gerontology</p
Equilibrium Distribution of Dissolved Carbon in PdC<sub><i>x</i></sub>: Density Functional Theory and Canonical Monte Carlo Simulations
Subsurface
carbon in Pd-based catalysts plays a key role in the
selectivity of hydrogenation reactions. The existing model for subsurface
carbon distribution (uniform Pd6C) in Pd inadequately interprets
the structure of all as-prepared PdCx catalysts.
Additionally, compared with neighboring element boron and nitrogen
forming PdA0.5 (A = B or N) alloys, the carbon concentration
in Pd is fairly low (usually PdC0.13). Utilizing density
functional theory calculations combined with Canonical Monte Carlo
(CMC) simulations, our present work investigates the carbon diffusion
into Pd(111) and Pd(100) and equilibrium distribution of carbon with
various concentrations in Pd(111). A zigzag trajectory of C atom diffusion
into Pd(111) and a spiral trajectory of C atom diffusion into Pd(100)
from the most stable adsorption site of the surface are verified.
Then, CMC simulations suggest a nonuniform distribution of dissolved
C atoms in the Pd(111) slab and provide the equilibrium distribution
configurations of dissolved C atoms at different ratios of C/Pd (0.04,
0.13, and 0.18) and the maximum of C atom coverage (0.33 ML) in odd
number sublayers (Suby, y = 1, 3, 5...). Finally, low carbon concentration and distribution
patterns of dissolved C atoms in Pd(111) are ascribed to strong in-plane
first nearest neighboring (1NN) C–C repulsion and isotropic
character of repulsion in Pd(111). Our results have provided a clear
microscopic description for carbon in Pd-based catalysts and been
instructive for understanding the role of C in hydrogenation reactions
Equilibrium Distribution of Dissolved Carbon in PdC<sub><i>x</i></sub>: Density Functional Theory and Canonical Monte Carlo Simulations
Subsurface
carbon in Pd-based catalysts plays a key role in the
selectivity of hydrogenation reactions. The existing model for subsurface
carbon distribution (uniform Pd6C) in Pd inadequately interprets
the structure of all as-prepared PdCx catalysts.
Additionally, compared with neighboring element boron and nitrogen
forming PdA0.5 (A = B or N) alloys, the carbon concentration
in Pd is fairly low (usually PdC0.13). Utilizing density
functional theory calculations combined with Canonical Monte Carlo
(CMC) simulations, our present work investigates the carbon diffusion
into Pd(111) and Pd(100) and equilibrium distribution of carbon with
various concentrations in Pd(111). A zigzag trajectory of C atom diffusion
into Pd(111) and a spiral trajectory of C atom diffusion into Pd(100)
from the most stable adsorption site of the surface are verified.
Then, CMC simulations suggest a nonuniform distribution of dissolved
C atoms in the Pd(111) slab and provide the equilibrium distribution
configurations of dissolved C atoms at different ratios of C/Pd (0.04,
0.13, and 0.18) and the maximum of C atom coverage (0.33 ML) in odd
number sublayers (Suby, y = 1, 3, 5...). Finally, low carbon concentration and distribution
patterns of dissolved C atoms in Pd(111) are ascribed to strong in-plane
first nearest neighboring (1NN) C–C repulsion and isotropic
character of repulsion in Pd(111). Our results have provided a clear
microscopic description for carbon in Pd-based catalysts and been
instructive for understanding the role of C in hydrogenation reactions
Single Transition Metal Atoms Anchored on Defective MoS<sub>2</sub> Monolayers for the Electrocatalytic Reduction of Nitric Oxide into Ammonia and Hydroxylamine
Ammonia
(NH3) and hydroxylamine (NH2OH) are
important feedstocks in the chemical industry. Electrocatalytic reduction
of nitric oxide (eNORR) to these chemical feedstocks is desirable
for green energy conversion and waste utilization. In this work, by
means of density functional theory (DFT) calculations, the eNORR activity
of defective single-layer MoS2 catalysts decorated with
transition metal atoms (TM@MoS2) is systematically studied.
Sulfur defects innately generated during the preparation of MoS2 monolayers are natural hosting sites for TM atoms. Out of
the 27 considered TM@MoS2 (3d to 5d period) catalysts,
19 are thermodynamically stable and experimentally feasible. Among
these 19 candidates, 13 exhibit a high eNORR activity toward NH3, while six prefer the production of NH2OH. Then,
their abilities to inhibit hydrogen evolution reaction (HER) and byproducts
(N2O/N2) are evaluated. Eventually, five TM@MoS2 catalysts (TM = Ni, V, Cr, Nb, Ti) are found to be promising
for affording NH3 with very low limiting potentials (UL = −0.18 to 0 V). Two TM@MoS2 catalysts (TM = Ag and Pt) are screened out for generating NH2OH, with UL of 0 V. The adsorption
of NO is a good descriptor for eNORR’s activity and product
selectivity. Thus, the TM@MoS2 catalysts may open a new
avenue for electrochemical NH3/NH2OH synthesis
and NO removal
Dissipation wavenumber and regularity for electron magnetohydrodynamics
We consider the electron magnetohydrodynamics (MHD) with static background ion flow. A special situation of B(x,y,t) = ∇× (a~e z) + b~e z with scalar-valued functions a(x,y,t) and b(x,y,t) was studied numerically in the physics paper [7]. The authors concluded from numerical simulations that there is no evidence of dissipation cutoff for the electron MHD. In this paper we show the existence of determining wavenumber for the electron MHD, and establish a regularity condition only on the low modes of the solution. Our results suggest that the conclusion of the physics paper on the dissipation cutoff for the electron MHD is debatable.</p
Equilibrium Distribution of Dissolved Carbon in PdC<sub><i>x</i></sub>: Density Functional Theory and Canonical Monte Carlo Simulations
Subsurface
carbon in Pd-based catalysts plays a key role in the
selectivity of hydrogenation reactions. The existing model for subsurface
carbon distribution (uniform Pd6C) in Pd inadequately interprets
the structure of all as-prepared PdCx catalysts.
Additionally, compared with neighboring element boron and nitrogen
forming PdA0.5 (A = B or N) alloys, the carbon concentration
in Pd is fairly low (usually PdC0.13). Utilizing density
functional theory calculations combined with Canonical Monte Carlo
(CMC) simulations, our present work investigates the carbon diffusion
into Pd(111) and Pd(100) and equilibrium distribution of carbon with
various concentrations in Pd(111). A zigzag trajectory of C atom diffusion
into Pd(111) and a spiral trajectory of C atom diffusion into Pd(100)
from the most stable adsorption site of the surface are verified.
Then, CMC simulations suggest a nonuniform distribution of dissolved
C atoms in the Pd(111) slab and provide the equilibrium distribution
configurations of dissolved C atoms at different ratios of C/Pd (0.04,
0.13, and 0.18) and the maximum of C atom coverage (0.33 ML) in odd
number sublayers (Suby, y = 1, 3, 5...). Finally, low carbon concentration and distribution
patterns of dissolved C atoms in Pd(111) are ascribed to strong in-plane
first nearest neighboring (1NN) C–C repulsion and isotropic
character of repulsion in Pd(111). Our results have provided a clear
microscopic description for carbon in Pd-based catalysts and been
instructive for understanding the role of C in hydrogenation reactions
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