Atmosphere,
Год журнала:
2023,
Номер
14(4), С. 716 - 716
Опубликована: Апрель 14, 2023
The
risk
of
COVID-19
infection
from
virulent
aerosols
is
particularly
high
indoors.
This
especially
true
for
classrooms,
which
often
do
not
have
pre-installed
ventilation
and
are
occupied
by
a
large
number
students
at
the
same
time.
It
has
been
found
that
precautionary
measures,
such
as
use
air
purifiers
(AP),
physical
distancing,
wearing
masks,
can
reduce
infection.
To
quantify
actual
effect
precautions,
it
possible
in
experimental
studies
to
expose
subjects
aerosols.
Therefore,
this
study,
we
develop
computational
fluid
dynamics
(CFD)
model
evaluate
impact
applying
aforementioned
precautions
classrooms
on
reducing
aerosol
concentration
potential
exposure
presence
index
or
infected
patients.
A
CFD-coupled
Wells–Riley
used
probability
(IP)
Different
cases
simulated
varying
occupancy
room
(half/full),
volumetric
flow
rate
AP,
two
different
locations
masks.
results
suggest
using
an
AP
reduces
spread
thereby
However,
person
sitting
adjacent
patient
only
marginally
reduced
be
avoided
with
half
capacity
class
(physical
distancing
method)
face
masks
efficiencies.
Journal of Food Protection,
Год журнала:
2025,
Номер
unknown, С. 100547 - 100547
Опубликована: Май 1, 2025
In
the
food
manufacturing
sector,
maintaining
industry
standards
and
ensuring
consumer
health
rely
fundamentally
on
quality
safety
of
products.
To
achieve
these
objectives,
hygiene
environmental
control
procedures
are
essential
for
preserving
product
integrity
minimizing
risk
contamination.
Hygiene
practices
encompass
strict
sanitation
guidelines,
such
as
regular
thorough
hand
washing,
meticulous
equipment
sterilization,
stringent
requirements
personal
cleanliness
handlers.
Similarly,
measures,
effective
pest
management
precise
regulation
temperature
air
quality,
critical
in
creating
optimal
conditions
production
safe
food.
This
article
underscores
pivotal
role
both
process
safety.
Drawing
from
extensive
research
insights,
it
explores
best
recommended
managing
factors
high
standards.
Furthermore,
delves
into
impact
technological
advancements
landscape,
examining
how
innovations
have
enhanced
ability
to
improve
conditions.
By
addressing
key
aspects,
provides
a
comprehensive
overview
importance
modern
manufacturing,
highlighting
their
significance
safeguarding
public
Buildings,
Год журнала:
2023,
Номер
13(4), С. 1033 - 1033
Опубликована: Апрель 14, 2023
While
many
school
retrofits
in
Korea
tend
to
focus
on
energy
savings,
some
operation
practices
and
policies
the
field
may
cause
indoor
air
quality
issues.
This
study
aims
analyze
impact
when
selected
measures
of
retrofit
package
are
applied
classrooms
a
real
context
with
actual
airflow
contaminant
transport
characteristics.
The
included
replacement
envelope
windows/doors/hallway-side
windows,
more
airtight
enclosures
as
byproduct
adding
insulation,
ventilation
systems
purifiers
under
various
operating
conditions,
natural
ventilation.
Actual
ages
10,
20,
80
years
were
selected.
Their
CONTAM
base
models
calibrated
measured
variables
per
American
Society
for
Testing
Materials
(ASTM)
D5157.
near-open-air
hallways
frequent
door
opening
made
ambient
PM2.5
hallways,
which
initially
originated
from
outdoors,
flow
into
classrooms.
Therefore,
infiltrations
penetrations
should
also
be
secured
along
those
via
envelope.
When
enclosures’
airtightness
is
enhanced,
mechanical
filtration
operation.
Specifically,
they
operate
independently
demand
reduction
policy.
Installing
high-efficiency
filter
can
help
situation
needs
run
at
reduced
volume.
Natural
ventilation,
intended
introduced
only
outdoor
conditions
desirable
supplemented
high-capacity
purifier
maintain
stable
concentrations.
Atmosphere,
Год журнала:
2023,
Номер
14(4), С. 716 - 716
Опубликована: Апрель 14, 2023
The
risk
of
COVID-19
infection
from
virulent
aerosols
is
particularly
high
indoors.
This
especially
true
for
classrooms,
which
often
do
not
have
pre-installed
ventilation
and
are
occupied
by
a
large
number
students
at
the
same
time.
It
has
been
found
that
precautionary
measures,
such
as
use
air
purifiers
(AP),
physical
distancing,
wearing
masks,
can
reduce
infection.
To
quantify
actual
effect
precautions,
it
possible
in
experimental
studies
to
expose
subjects
aerosols.
Therefore,
this
study,
we
develop
computational
fluid
dynamics
(CFD)
model
evaluate
impact
applying
aforementioned
precautions
classrooms
on
reducing
aerosol
concentration
potential
exposure
presence
index
or
infected
patients.
A
CFD-coupled
Wells–Riley
used
probability
(IP)
Different
cases
simulated
varying
occupancy
room
(half/full),
volumetric
flow
rate
AP,
two
different
locations
masks.
results
suggest
using
an
AP
reduces
spread
thereby
However,
person
sitting
adjacent
patient
only
marginally
reduced
be
avoided
with
half
capacity
class
(physical
distancing
method)
face
masks
efficiencies.
