Technical Review of Radiative-Property Modeling Approaches for Gray and Nongray Radiation, and a Recommended Optimized WSGGM for CO2/H2O-Enriched Gases
Results in Engineering,
Journal Year:
2025,
Volume and Issue:
unknown, P. 103923 - 103923
Published: Jan. 1, 2025
Language: Английский
Aerial e-mobility perspective: Anticipated designs and operational capabilities of eVTOL urban air mobility (UAM) aircraft
Edelweiss Applied Science and Technology,
Journal Year:
2025,
Volume and Issue:
9(1), P. 413 - 442
Published: Jan. 4, 2025
We
collected
data
about
13
urban
air
mobility
(UAM)
electric
vertical
take-off
and
landing
(eVTOL)
aircraft
from
12
UAM
companies
in
the
world.
While
none
of
these
models
has
yet
reached
a
large-scale
commercial
operation
(particularly
as
taxis),
some
them
progressed
well
certification
process
may
have
their
widely
operated
within
few
years.
This
article
focuses
on
variability
configurations
eVTOL
for
aerial
e-mobility;
such
single-fixed-wing,
tandem-tilt-wing,
canard
wing,
fixed-rotor
fixed-wing,
full
tilt-rotor,
partial
V-shaped
tail,
tailless,
twin
conventional
tail
assembly,
distributed
propulsion,
multicopter,
rear
forward
thrust
propeller,
ducted
fans,
hybrid
airplane-helicopter
design.
The
covered
here
are:
(1)
EH216-S
(by
EHang),
(2)
VoloCity
Volocopter),
(3)
Lilium
Jet
Lilium),
(4)
VoloRegion
(5)
CityAirbus
NextGen
Airbus),
(6)
Passenger
Air
Vehicle
-
PAV
Boeing),
(7)
S-A2
Hyundai),
(8)
Joby
Aviation),
(9)
VX4
Vertical
Aerospace
Group),
(10)
Midnight
Archer
(11)
Eve
Mobility),
(12)
Jaunt
(13)
Generation
6
Wisk
Aero).
Out
e-mobility
and/or
taxis,
we
found
that
11
utilize
wing
configuration,
while
only
two
use
wingless
multirotor
concept
(as
hobbyist
drones).
A
fixed-wing
design
is
associated
with
faster
travel
speed,
at
expense
added
restrictions
maneuvering
low-speed
(or
hovering).
Six
are
intended
to
an
onboard
human
pilot,
remaining
seven
designed
be
pilotless.
One
model
demonstrated
ability
hydrogen
clean
source
energy
through
fuel
cell
system.
Language: Английский
Summary of the 2023 (1st edition) Report of TCEP (Tracking Clean Energy Progress) by the International Energy Agency (IEA), and Proposed Process for Computing a Single Aggregate Rating
E3S Web of Conferences,
Journal Year:
2025,
Volume and Issue:
601, P. 00048 - 00048
Published: Jan. 1, 2025
We
provide
a
summary
of
the
progress
all
53
assessed
components
describing
global
alignment
with
Net
Zero
Emissions
by
2050
Scenario
(NZE)
International
Energy
Agency
(IEA),
an
intermediate
trajectory
scope
2030.
The
(grouped
in
eight
categories)
cover
sectors
(such
as
Transport,
and
Buildings),
subsectors
Aviation,
Building
Envelopes),
technologies
Biofuels,
Electrification),
infrastructure
cross-cutting
strategies
CO2
Transport
Storage,
Electrolyzers).
For
each
component,
IEA
assigned
one
three
qualitative
levels;
namely
“On
track”,
“More
efforts
needed”,
or
“Not
on
track”.
IEA’s
assessment
results
were
made
publicly
available
form
online
web-based
report,
titled
“Tracking
Clean
Progress”,
TCEP,
which
was
published
12/July/2023.
Out
TCEP’s
components,
only
rated
these
are
(1)
Solar
Photovoltaic
(PV),
(2)
Electric
Vehicles
(EV),
(3)
Lighting.
remaining
50
TCEP;
28
22
propose
quantitative
aggregate
numerical
score
to
describe
overall
clean
energy
transition
reflected
TCEP
we
compute
it
2.23/4
(or
55.7%).
Finally,
present
selected
historical
records
(based
data)
about
satisfactory
for
transition.
Language: Английский
Wind Speed Weibull Model Identification in Oman, and Computed Normalized Annual Energy Production (NAEP) From Wind Turbines Based on Data From Weather Stations
Engineering Reports,
Journal Year:
2025,
Volume and Issue:
7(3)
Published: March 1, 2025
ABSTRACT
Using
observation
records
of
wind
speeds
from
weather
stations
in
the
Sultanate
Oman
between
2000
and
2023,
we
compute
estimators
two
Weibull
distribution
parameters
(namely,
distribution's
shape
parameter
scale
parameter)
10
station
locations
within
eight
Omani
governorates.
The
their
corresponding
governorates
are
Seeb
(in
Muscat),
Salalah
Dhofar),
Buraimi
Al
Buraimi),
Masirah
Ash
Sharqiyah
South),
Thumrait
Sur
Khasab
Musandam),
Sohar
Sohar),
Fahud
Az
Zahirah),
Saiq
Ad
Dakhiliyah).
obtained
speed
distributions
at
these
then
used
to
predict
annual
energy
production
(AEP)
for
a
proposed
reference
amount
1
MWp
turbine
capacity,
this
specific
AEP
is
designated
here
by
term
“normalized
(NAEP).”
direction
also
analyzed
statistically
over
same
period
identify
more
probable
directions.
Four
were
clearly
distinguishable
as
being
windy
compared
others.
simulated
probability
exceeding
feasible
6
m/s
(21.6
km/h)
41.71%
Thumrait,
37.77%
Masirah,
29.53%
Sur,
17.03%
Fahud.
NAEP
values
four
estimated
1.727
GWh/MWp/year,
1.419
1.038
0.602
GWh/MWp/year;
respectively.
location
not
only
fastest
(on
average)
among
selected
locations,
but
most
unidirectional,
blowing
almost
always
south–south‐east
(SSE)
direction;
both
features
make
non‐coastal
southern
Oman,
with
an
altitude
about
467
m,
attractive
site
utility‐scale
farms.
We
analyze
data
port
city
Duqm;
show
that
there
24.04%,
0.927
approximately
south–south‐west
(SSW)
time.
When
photovoltaic
(PV)
solar
systems,
onshore
systems
installed
capacity
appear
be
less
effective
Oman.
This
study
closes
gap
field
where
no
similar
standardized
one
propose
present.
Language: Английский
Hydrogen Utilization as a Plasma Source for MHD-DPE (Magnetohydrodynamic Direct Power Extraction)
IEEE Access,
Journal Year:
2024,
Volume and Issue:
12, P. 167088 - 167107
Published: Jan. 1, 2024
This
study
explores
the
suitability
of
hydrogen-based
plasma
in
direct
power
extraction
(DPE)
as
a
non-conventional
electricity
generation
method.
We
apply
computational
modeling
and
principles
physics
chemistry
to
estimate
different
thermal
electric
properties
water-vapor/nitrogen/cesium-vapor
(H2O/N2/Cs)
gas
mixture
with
levels
cesium
(Cs)
at
fixed
temperature
2300
K
(2026.85
{\deg}C).
are
selected
because
they
resemble
stoichiometric
combustion
hydrogen
air,
followed
by
addition
alkali
metal
element
allow
ionization,
thus
converting
into
electrically
conducting
plasma.
vary
mole
fraction
two
orders
magnitude,
from
minute
amount
0.0625%
(1/1600)
major
16%
(0.16).
use
these
results
further
theoretical
upper
limit
output
unit
volume
high-speed
magnetohydrodynamic
(MHD)
channel,
accelerated
inside
it
twice
local
speed
sound
(Mach
number
2)
while
subject
an
applied
magnetic
field
5
T
(5
teslas).
report
that
there
is
optimum
3%,
which
maximized.
Per
1
m3
volume,
estimated
atm
(101.325
kPa)
pressure
hydrogen-combustion
extraordinarily
high
360
MW/m3,
conductivity
17.5
S/m.
even
reaches
impressive
level
1.15
GW/m3
(11500
MW/m3)
if
absolute
can
be
decreased
0.0625
(6.333
kPa),
exceeds
55
S/m
(more
than
10
times
seawater).
Language: Английский
Portrait of the Decarbonization and Renewables Penetration in Oman’s Energy Mix, Motivated by Oman’s National Green Hydrogen Plan
Energies,
Journal Year:
2024,
Volume and Issue:
17(19), P. 4769 - 4769
Published: Sept. 24, 2024
The
aim
of
this
study
is
to
quantitatively
describe
the
anticipated
change
in
energy
mix
Sultanate
Oman
(Oman)
as
country
moves
forward
its
national
plan
for
green
hydrogen,
order
become
a
global
producer
and
exporter.
This
achieved
by
curating
recent
data
about
projects
that
are
either
operating
or
planned
(in
construction
pre-construction
stage).
Then,
these
processed
further
extract
useful
insights
how
would
if
realized
added
ones.
reveals
serious
commitment
accomplish
hydrogen
(GH),
where
production
ambition
2030
1.125
million
tons
per
annum
(Mtpa),
using
renewable
capacity
approximately
18
GW.
increases
3.5
Mtpa
with
70
GW
renewables
2040,
8
180
2050.
As
portrait
Oman’s
assumption
successfully
completing
all
projects,
we
found
expected
have
total
83.1271
GW,
share
(solar
wind)
reaching
83.133%
(as
compared
15.0711
an
8.907%
projects).
Nearly
(precisely
99.571%)
68.0560
additions
based
on
solar
wind
energy,
while
traditional
oil–gas
gradually
phased
out.
Green
dominates
surge
penetration
within
Omani
mix,
84.659%
34.3140
linked
production,
water
electrolyzers.
Similarly,
98.804%
33.4500
production.
Language: Английский
Edelweiss Applied Science and Technology
SSRN Electronic Journal,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
Language: Английский
Benchmarking retention, progression, and graduation rates in undergraduate higher education across different time windows
Cogent Education,
Journal Year:
2025,
Volume and Issue:
12(1)
Published: May 7, 2025
Language: Английский
Reduced-Order Modeling (ROM) of a Segmented Plug-Flow Reactor (PFR) for Hydrogen Separation in Integrated Gasification Combined Cycles (IGCC)
Processes,
Journal Year:
2025,
Volume and Issue:
13(5), P. 1455 - 1455
Published: May 9, 2025
In
an
integrated
gasification
combined
cycle
(IGCC),
a
process
produces
gas
stream
from
solid
fuel,
such
as
coal
or
biomass.
This
(syngas
synthesis
gas)
resulting
the
contains
carbon
monoxide,
molecular
hydrogen,
and
dioxide
(other
gaseous
components
may
also
be
present
depending
on
gasified
fuel
gasifying
agent).
Separating
hydrogen
this
syngas
has
advantages.
One
of
methods
to
separate
is
selective
permeation
through
palladium-based
metal
membrane.
separation
complicated
it
depends
nonlinearly
various
variables.
Thus,
desirable
develop
simplified
reduced-order
model
(ROM)
that
can
rapidly
estimate
performance
under
operational
conditions,
preliminary
stage
computer-aided
engineering
(CAE)
in
chemical
processes
sustainable
industrial
operations.
To
fill
gap,
we
here
proposed
procedure
for
one-dimensional
steady
plug-flow
reactor
(PFR)
use
investigate
membrane
(MR),
produced
(IGCC).
model,
(a
feed
stream)
enters
one
side
into
retentate
zone,
while
nitrogen
sweep
opposite
neighbor
permeate
zone.
The
two
zones
are
separated
by
permeable
palladium
surfaces
selectively
hydrogen.
After
analyzing
profile
base
case
(300
°C
uniform
temperature,
40
atm
absolute
pressure,
20
pressure),
temperature
module,
retentate-side
permeate-side
pressure
varied
individually
their
influence
investigated.
all
simulation
cases,
fixed
targets
95%
recovery
40%
mole-fraction
at
exit
demanded.
module
length
allowed
change
order
satisfy
these
targets.
Other
dependent
permeation-performance
variables
investigated
include
logarithmic
mean
pressure-square-root
difference,
apparent
permeance,
efficiency
factor
permeation.
contributions
our
study
linked
fields
applications,
production,
gasification,
analytical
modeling,
numerical
analysis.
addition
separation,
linear
nonlinear
regression
models
derived
obtained
results.
work
gives
general
insights
via
membranes
(MR).
For
example,
most
effective
improve
performance.
Increasing
value
120
results
proportional
gain
permeated
mass
flux,
with
about
0.05
kg/m2.h
gained
per
1
increase
decreasing
bar
0.2
causes
flux
exponentially
1.15
kg/m2.h.
5.11
United
Nations
Sustainable
Development
Goal
(SDG)
numbers
7,
9,
11,
13.
Language: Английский
Decoding Oman's scientific DNA: A multi-dimensional bibliometric analysis
Information Development,
Journal Year:
2025,
Volume and Issue:
unknown
Published: May 20, 2025
This
paper
explores
Oman's
research
landscape
through
bibliometric
and
altimetric
techniques
applied
to
43,710
Scopus-indexed
documents
from
1912
2024.
Using
VOSviewer
Bibliometrix
tools,
along
with
data
six
ranking
systems
Altmetric.com,
the
analysis
reveals
that
96%
of
publications
on
Scopus
emerged
after
2000.
The
leading
fields
are
Medicine
(13.10%),
Engineering
(11.46%),
Computer
Science
(8.29%),
international
collaboration
accounting
for
63.47%
publications.
primary
partners
India,
UK,
USA.
Sultan
Qaboos
University
is
highest-ranking
institution,
placing
362nd
globally
(QS
2025),
while
most
other
universities
in
Sultanate
struggle
achieve
rankings,
showing
only
∼20.1%
overall
coverage—with
notable
disparities
between
Life
Sciences
(high
coverage)
Social
(low
coverage).
To
date,
no
comprehensive
study
Oman
has
combined
bibliometric,
ranking,
altmetric
analyses
offer
unique
recommendations
based
bibliometrics.
These
findings
carry
important
implications
policy
institutional
strategy,
underscoring
necessity
targeted
support
underperforming
fields,
improved
collaboration,
enhanced
public
engagement
strategies
ensure
nation
remains
visible
global
academic
arena.
Language: Английский