Advanced Theory and Simulations,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 12, 2024
Abstract
This
study
introduces
a
rake‐shaped
graphene
nanostructure
and
investigates
multiple
Fano
resonances
its
sensing
application
by
using
finite‐difference
time‐domain
(FDTD)
simulations
method.
Here,
the
dependence
of
structural
parameters,
Fermi
levels,
incidence
angle
polarization
input
wave
on
optical
transmission
spectra
is
aimed
at
investigating.
The
results
show
that
tunable
can
be
achieved
in
nanostructure.
In
addition,
characteristics
based
multi‐Fano
resonance
are
also
studied
work.
research
sensitivity
figure
merit
(FOM)
reach
up
to
2.1
THz/RIU
3.3/RIU
as
result
enhanced
interaction
between
environmental
substances
waves.
These
findings
deepen
understanding
plasmonic
graphene‐based
metasurfaces
emphasize
their
significant
potential
applications.
Applied Energy,
Год журнала:
2024,
Номер
364, С. 123130 - 123130
Опубликована: Апрель 5, 2024
Multi-Objective
Optimization
(MOO)
poses
a
computational
challenge,
particularly
when
applied
to
physics-based
models.
As
result,
only
up
three
objectives
are
typically
involved
in
simulation-based
optimization.
To
go
beyond
this
number,
Surrogate
Models
(SMs)
need
replace
such
high-fidelity
In
exploratory
study,
the
perform
comprehensive
regression
surrogate
modeling
and
conduct
MOO
for
Multi-Generation
System
(MGS).
The
most
suitable
SM
was
chosen
among
four
neural-network
models:
Artificial
Neural
Network
(ANN),
Convolutional
(CNN),
Long-Short
Term
Memory
(LSTM),
an
ensemble
model
developed
through
brute-force
search
using
aforementioned
final
found
be
superior
others,
achieving
R2
values
ranging
from
0.9830
0.9999.
Next,
optimization
problem
with
six
conflicting
defined
performed
at
distinct
of
Direct
Normal
Irradiation
(DNI),
time-dependent
feature.
This
aimed
provide
multi-criteria
decision-making
information
based
on
atmospheric
transparency.
new
understandings
were
gained:
(I)
exergy
efficiency,
production
cost,
freshwater
rate
highly
influenced
by
DNI,
(II)
critical
range
operation
observed
within
DNI
interval
100
400
W/m2.
Furthermore,
we
compared
result
six-objective
that
bi-objective
obtained
our
study
all
showed
improvements
1.9%
12.7%.
Finally,
findings
present
some
practical
recommendations
put
forward
applying
proposed
methodology
similar
MGSs.
Abstract
The
quality
requirements
of
graphene
depend
on
the
applications.
Some
have
a
high
tolerance
for
and
even
require
some
defects,
while
others
as
perfect
possible
to
achieve
good
performance.
So
far,
synthesis
large‐area
films
by
chemical
vapor
deposition
carbon
precursors
metal
substrates,
especially
Cu,
remains
main
way
produce
high‐quality
graphene,
which
has
been
significantly
developed
in
past
15
years.
However,
although
many
prototypes
are
demonstrated,
their
performance
is
still
more
or
less
far
from
theoretical
property
limit
graphene.
This
review
focuses
how
make
super
namely
with
structure
free
contaminations.
More
specially,
this
study
Cu
substrates.
Typical
defects
first
discussed
together
formation
mechanisms
they
characterized
normally,
followed
brief
properties
effects
defects.
Then,
progress
aspects
substrate,
grain
size,
wrinkles,
contamination,
adlayers,
point
reviewed.
Graphene
transfer
briefly
well.
Finally,
challenges
strategy
proposed.
Materials Horizons,
Год журнала:
2023,
Номер
10(9), С. 3631 - 3642
Опубликована: Янв. 1, 2023
In
this
study,
we
demonstrate
the
sintering
of
metastable
ε-Fe2O3
nanoparticles
into
nanoceramics
containing
98
wt%
epsilon
iron
oxide
phase
and
with
a
specific
density
60%.
At
room
temperature,
ceramics
retain
giant
coercivity
20
kOe
sub-terahertz
absorption
at
190
GHz
inherent
in
initial
nanoparticles.
The
leads
to
an
increase
frequencies
natural
ferromagnetic
resonance
200-300
K
larger
coercivities
temperatures
below
150
K.
We
propose
simple
but
working
explanation
low-temperature
dynamics
macroscopic
magnetic
parameters
materials
via
transition
smallest
superparamagnetic
state.
results
are
confirmed
by
temperature
dependence
magnetocrystalline
anisotropy
constant
micromagnetic
modeling.
addition,
based
on
Landau-Lifshitz
formalism,
discuss
features
spin
possibility
using
as
spin-pumping
media.
Our
observations
will
expand
applicability
promote
their
integration
telecommunication
devices
next
generation.
Photonics,
Год журнала:
2024,
Номер
11(12), С. 1100 - 1100
Опубликована: Ноя. 21, 2024
With
the
introduction
of
advanced
Fiber
Bragg
Grating
(FBG)
technology,
Fabry–Pérot
(FP)
interferometers
have
become
widely
used
in
fiber-optic
ultrasound
detection.
In
these
applications,
slope
reflectance
is
a
critical
factor
influencing
detection
results.
Due
to
intensity
limitations
laser
source
detection,
FBG
generally
increased
enhance
signal-to-noise
ratio
(SNR).
However,
increasing
can
cause
curve
deviate
from
sinusoidal
shape,
which
turn
affects
and
introduces
greater
errors.
This
paper
first
investigates
relationship
between
transmission
FP
interferometer
reflectance,
with
focus
on
errors
introduced
by
simplified
assumptions.
Further
research
shows
that
sensors
asymmetric
slopes,
their
transmittance
curves
significantly
signals.
discrepancy
highlights
importance
achieving
symmetrical
slopes
ensure
consistent
accurate
To
address
this
issue,
proposes
an
innovative
method
adjust
rear-end
combining
stress
modulation,
UV
adhesive,
high-reflectivity
metal
disk.
Additionally,
adjusting
approximates
signal,
symmetry
maintained.
Finally,
through
practical
testing,
incident
wavelength
positions
extrema
(or
zero)
at
equal
intervals,
expected
signals
be
detected.
converts
problem
approximating
signal
into
adjustment
curve,
making
it
easier
more
direct
determine
its
impact
The
proposed
not
only
improves
performance
but
also
reduces
costs,
paving
way
for
broader
applications
medical
diagnostics
structural
health
monitoring.
Sensors,
Год журнала:
2023,
Номер
23(13), С. 5797 - 5797
Опубликована: Июнь 21, 2023
We
present
a
novel
terahertz
(THz)
Fabry-Perot
(FP)
microcavity
biosensor
that
uses
porous
polytetrafluoroethylene
(PTFE)
supporting
film
to
improve
microorganism
detection.
The
THz
FP
confines
and
enhances
fields
in
the
middle
of
cavity,
where
target
microbial
is
placed
with
aid
PTFE
having
dielectric
constant
close
unity
range.
resonant
frequency
shift
increased
linearly
increasing
amount
yeasts,
without
showing
saturation
behavior
under
our
experimental
conditions.
These
results
agree
well
finite-difference
time-domain
(FDTD)
simulations.
sensor's
sensitivity
was
11.7
GHz/μm,
optimal
condition
12.5
when
yeast
at
cavity's
center,
but
no
observed
coated
on
mirror
side.
derived
an
explicit
relation
for
as
function
index,
amount,
location
substances
consistent
electric
field
distribution
across
cavity.
also
produced
transmission
images
yeast-coated
PTFE,
mapping
resonance
revealing
spatial
yeast.
Optics Express,
Год журнала:
2023,
Номер
31(26), С. 42995 - 42995
Опубликована: Авг. 31, 2023
Polaritons
in
reduced-dimensional
materials,
such
as
nanowire,
nanoribbon
and
rolled
nanotube,
usually
provide
novel
avenues
for
manipulating
electromagnetic
fields
at
the
nanoscale.
Here,
we
theoretically
propose
study
hyperbolic
phonon
polaritons
(HPhPs)
with
one-dimensional
molybdenum
trioxide
(MoO
