43 research outputs found
Role of crystal-field-splitting and longe-range-hoppings on superconducting pairing symmetry of LaNiO
We study the bilayer two-orbital model for superconducting pairing symmetry
of LaNiO under pressure. By combining density-functional-theory
(DFT), maximally-localized-Wannier-function, and linearized Eliashberg equation
with random-phase-approximation, we find that the superconducting pairing
symmetry of LaNiO is robustly if its DFT band structure is
accurately reproduced in the downfolded model. We further show that fine-tuning
of crystal-field-splitting between two Ni- orbitals qualitatively affects
superconducting pairing symmetry of the bilayer two-orbital model, which
changes from to as the crystal-field-splitting exceeds a
critical value. When the model only includes nearest-neighbor and
second-nearest-neighbor hoppings, the crystal-field-splitting obtained by
fitting to the DFT band structure is larger than the critical value and thus
leads to superconducting pairing symmetry. When all nonzero
long-range-hoppings are also included in the model, the fitted
crystal-field-splitting is reduced and smaller than the critical value, which
makes superconducting pairing symmetry more favorable than
symmetry. Our work demonstrates that in downfolded effective models, the
details of band structure can play a crucial role in determining pairing
symmetry in multi-orbital unconventional superconductors (such as
LaNiO).Comment: 11 pages and 4 figure
Full-sky ray-tracing simulation of weak lensing using ELUCID simulations: exploring galaxy intrinsic alignment and cosmic shear correlations
The intrinsic alignment of galaxies is an important systematic effect in
weak-lensing surveys, which can affect the derived cosmological parameters. One
direct way to distinguish different alignment models and quantify their effects
on the measurement is to produce mocked weak-lensing surveys. In this work, we
use full-sky ray-tracing technique to produce mock images of galaxies from the
ELUCID -body simulation run with the WMAP9 cosmology. In our model we assume
that the shape of central elliptical galaxy follows that of the dark matter
halo, and spiral galaxy follows the halo spin. Using the mocked galaxy images,
a combination of galaxy intrinsic shape and the gravitational shear, we compare
the predicted tomographic shear correlations to the results of KiDS and DLS. It
is found that our predictions stay between the KiDS and DLS results. We rule
out a model in which the satellite galaxies are radially aligned with the
center galaxy, otherwise the shear-correlations on small scales are too high.
Most important, we find that although the intrinsic alignment of spiral
galaxies is very weak, they induce a positive correlation between the
gravitational shear signal and the intrinsic galaxy orientation (GI). This is
because the spiral galaxy is tangentially aligned with the nearby large-scale
overdensity, contrary to the radial alignment of elliptical galaxy. Our results
explain the origin of detected positive GI term from the weak-lensing surveys.
We conclude that in future analysis, the GI model must include the dependence
on galaxy types in more detail.Comment: 23 pages, 13 figures, published in ApJ. Our mock galaxy catalog is
available upon request by email to the author ([email protected],
[email protected]
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Revealing the crystalline packing structure of Y6 in the active layer of organic solar cells: the critical role of solvent additives
The bulk heterojunction (BHJ) morphology of photovoltaic materials is crucial to the fundamental optoelectronic properties of organic solar cells (OSCs). However, in the photoactive layer, the intrinsic crystalline packing structure of Y6, currently the hallmark molecule among Y-series non-fullerene acceptors (NFAs), has not been unambiguously determined. Here, employing grazing-incidence wide-angle X-ray scattering (GIWAXS), we managed to uncover the intrinsic crystalline packing structure of Y6 in the BHJ active layer of OSCs, which is found to be different from its single-crystal structure reported previously. Moreover, we find that solvent additive 1-chloronaphthalene (CN) can induce highly ordered packing of Y6 in BHJ thin films. With the help of atomistic molecular dynamics simulations, it is revealed that π-π interactions generally exist between naphthalene derivatives and IC terminals of Y6 analogues, which would essentially improve their long-range ordering. Our work reveals the intrinsic crystalline packing structure of Y6 in the BHJ active layer as well as its crystallization mechanism in thin films, thus providing direct correlations between this crystalline packing and the device characteristics and photophysical properties.Knut och Alice Wallenbergs StiftelseImmediate accessThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]
Simulation of Motion Interactions of a 2-DOF Linear Piezoelectric Impact Drive Mechanism with a Single Friction Interface
A two-degrees-of-freedom (2-DOF) linear piezoelectric impact drive mechanism (PIDM) is actuated by two independent piezoelectric actuators (PAs). The coupled motion interactions of a two orthogonal DOF linear PIDM with a single friction interface are introduced and analyzed. A complete dynamic model of the 2-DOF PIDM is established with the Karnopp friction model considering the distribution of friction in the x-axis and y-axis. The output displacements of the 2-DOF PIDM and two corresponding independent 1-DOF PIDMs are investigated numerically. When the two input exciting signals of a 2-DOF PIDM have the same driving voltage of 100 V with a duty ratio of 98% at 10 Hz and two 1-DOF PIDMs are driving under the same conditions, the step displacements in the two axes of 2-DOF PIDM are improved compared to the corresponding 1-DOF PIDM. When the two input exciting signals of a 2-DOF PIDM have the same driving voltages of 100 V with a duty ratio of 98% but the driving frequency is 10 Hz in the x-axis and 20 Hz in the y-axis, the results show that the displacement of high frequency achieves a slight decrease and displacement of low frequency shows a large increase compared to the two corresponding 1-DOF PIDMs
Effect of the Modifications on the Physicochemical and Biological Properties of β-Glucan—A Critical Review
β-Glucan exhibits many biological activities and functions such as stimulation of the immune system and anti-inflammatory, anti-microbial, anti-infective, anti-viral, anti-tumor, anti-oxidant, anti-coagulant, cholesterol-lowering, radio protective, and wound healing effects. It has a wide variety of uses in pharmaceutical, cosmetic, and chemical industries as well as in food processing units. However, due to its dense triple helix structure, formed by the interaction of polyhydroxy groups in the β-d-glucan molecule, it features poor solubility, which not only constrains its applications, but also inhibits its physiological function in vivo. One aim is to expand the applications for modified β-glucan with potential to prevent disease, various therapeutic purposes and as health-improving ingredients in functional foods and cosmetics. This review introduces the major modification methods required to understand the bioactivity of β-glucan and critically provides a literature survey on the structural features of this molecule and reported biological activity. We also discuss a new method to create novel opportunities to exploit maximally various properties of β-glucan, namely ultrasound-assisted enzymatic modification
Digital art exhibitions and psychological well-being in Chinese Generation Z: An analysis based on the S-O-R framework
Abstract In the post-pandemic era, there has been a heightened global focus on the mental health challenges facing individuals, with a particular emphasis on innovative and effective therapeutic approaches. Despite the extensive body of research within the realm of art therapy addressing individual psychological healing, the potential of digital mediums in this field has been largely overlooked. This gap is especially pronounced in studies targeting the unique demographic of Generation Z, known as ‘digital natives.’ This study aims to investigate the role of engagement in online digital exhibitions as a potential restorative intervention for enhancing the mental well-being of Generation Z users. Grounded in the Stimulus-Organism-Response (S-O-R) framework and the theory of restorative environments, this research examines the psychological responses of Generation Z participants to online digital art exhibitions, particularly from the perspective of website aesthetics. The impact of these responses on users’ place attachment and loyalty behaviors is also explored. Utilizing a structural equation modeling approach, an online digital art exhibition was deployed on the ZEPETO app, a platform popular among Chinese Generation Z users. Participants were subsequently invited to partake in an online survey post-exhibition, yielding a dataset of 332 valid responses. The findings reveal that: (1) the four design elements of website aesthetics (coherence, novelty, interactivity, immersion) significantly influence the perceived restoration among Generation Z users, with immersion being the most influential factor; (2) perceived restoration and place attachment are crucial predictors of loyalty behavior; (3) perceived restoration has a positive impact on the place attachment of Generation Z users towards online digital art exhibitions. This study demonstrates that online digital art exhibitions can facilitate an emotional healing journey for Generation Z, contributing to the alleviation of psychological stress and the promotion of psychological well-being. Moreover, digital technology exhibitions have the potential to transcend human creativity and imagination, offering a unique and promising pathway for future research and practices in design related to emotional healing