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Volume 10, No. 3,
2017, 1438 H
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Communication |
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Reflectance
Enhancement
Factor
Associated
with
Coherent
Interference
of Light
in an
Unbacked
or
Embedded
Quarter-Wave
Layer
If a
semi-infinite
transparent
substrate
is
replaced
by a
quarter-wave
layer (QWL)
of the
same
material,
which is
embedded
in the
same
ambient,
the
intensity
reflectance
is
increased
by a
significant
factor.
A simple
expression
is
derived
for this
reflectance
enhancement
factor
(REF)
that
results
from
coherent
multiple-beam
interference
of
monochromatic
light
within
the QWL.
The REF
is a
monotonically
decreasing
function
of the
Fresnel
intensity
reflectance
at the
ambient-layer
interface
with
maximum
and
minimum
values
of 4 and
1,
respectively.
The
expression
for is
applicable
for the
p and s
linear
polarizations,
at any
angle of
incidence
and for
any
wavelength
within
the
common
transparency
bandwidth
of both
layer
and
ambient.
...
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R. M. A.
Azzam
JJP,
2017, 10(3)
,
113-116
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English
Articles |
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Estimation
of
Natural
and
Anthropogenic
Exposures
to Gamma
Ray from
a High
Agricultural
Area in
Jordan "Bani-Kananah
District"
The
activity
concentrations
of some
artificial
and
natural
radionuclides
in some
soil
samples
from
high
agricultural
area, in
North
West
Jordan
“Bani-Kananah
District”,
were
measured
by using
gamma
ray
spectrometry.
The
activity
concentrations
of
137Cs
(Cesium),
40K
(Potassium),
238U
(Uranium)
and
232Th
(Thorium)
were
measured
in 38
soil
samples
which
were
collected
from
agricultural
area.
The
radiation
hazard
indices
of soil
samples
were
also
calculated.
The
results
showed
that the
average
values
of
either
radionuclides
activity
concentrations
or
radiation
hazard
indices
of all
soil
samples
under
study
were in
the
internationally
allowable
and
lower
range.
... |
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H. S.
Hamadneh,
M. M.
Eyadeh,
M. J.
Abdallah
and
O. A.
Al-Khdirat
JJP,
2017, 10(3)
,
117-125
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Semi-Quantitative
Analysis
for
Pottery
Fragments
Excavated
at
Udhruh
Site,
Jordan
Using
Non-destructive
SR-XRF
Analysis
Employing
Multivariate
Statistical
Methods
This
paper
presents
a
multielement
analysis
of
fifteen
Ayyubid-Mamluk
glazed
pottery
sherds
for
determining
the
chemical
composition
in order
to study
their
provenance.
The
tested
fragments
in this
work
belong
to the
historical
site of
Udhruh
in
southern
Jordan.
The
chemical
analysis
for
samples
has been
carried
out by
using
Synchrotron
Radiation
X-ray
Fluorescence
Spectrometry
(SR-XRF)
technique.
The
semi-quantitative
analysis
of the
elements
Fe, Cu,
Zn, Br,
Rb, Sr,
Y, Zr,
Nb, Mo,
Pd, Ag,
Cd and
Pb has
been
applied
to the
samples
using
SR-XRF
technique.
The data
were
analyzed
by using
Principal
Component
Analysis
(PCA)
and
Hierarchical
Cluster
Analysis
(HCA) in
order to
define
groups
of
different
glazed
pottery
sherds
by
obtaining
information
about
their
similarity
and
clustering.
... |
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K.
AbuSaleem,
A.
Aldrabee,
A.
Wriekat,
M.
Tarawneh
and
F.
Abudanah
JJP,
2017, 10(3)
,
127-137
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Assessment
of
Indoor
Radon
Levels
in
Selected
Locations
within
Lagos
State
University,
Ojo,
Lagos
An
indoor
radon
measurement
survey
was
carried
out in
eleven
offices
in the
campus
of Lagos
State
University,
Ojo,
Nigeria
using
Pro
series
3, radon
gas
detector
model
HS71512.
The main
objective
of this
survey
was to
estimate
radiation
doses
received
by the
dwellers
of these
offices
due to
indoor
radon
exposure.
For this
research,
radon
detectors
were
suspended,
where
the
ventilation
slits
will not
be
blocked
at least
1.2m
above
the
floor, a
height
in the
breathing
zone of
a seated
person,
for 48
hours.
The
values
of
indoor
concentration
vary
from
3.70 Bq/m3
to
218.30
Bq/m3
with an
average
value of
84.04 Bq/m3.
The
value of
effective
dose
varies
from
0.08 mSv
to 3.76
mSv with
an
average
value of
1.45 mSv. |
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M. A.
Olaoye,
T. J.
Aluko,
O. A.
Jegede,
M. F.
Agbesi
and
O. O.
Ajayi
JJP,
2017, 10(3)
,
139-141
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Fuel
Ignition
Conditions
in
Thermonuclear
Fusion
The
isobaric
and
isochoric
models
of
inertial
confinement
fusion (ICF)
are
compared
in hot
spot
concept.
Heating
and
cooling
mechanisms
of fuel
are
theoretically
investigated.
Some
corrections
are
suggested
to
improve
the
Bremsstrahlung
emission
calculation
at
ultra-relativistic
regime
and
super
high
temperature
plasma
situation.
An
admissible
region
of
values
is
determined
which
satisfy
hot spot
spark-ignition
condition
to start
a
self-sustaining
fusion
burn. An
optimized
point of
this
region
is
specified
to
achieve
a
maximum
fuel
gain.
The
density
and
radius
of this
optimum
point
are
determined
applying
a
hydrodynamic
model.
... |
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M.
Mahdavi
JJP,
2017, 10(3)
,
143-151
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Assessment
of Human
Exposures
to
Radiation
Arising
from
Radon in
Groundwater
Samples
from
Parts of
Abeokuta,
Ogun
State,
Nigeria
This
study
aimed at
assessing
the
level of
radiation
dose
arising
from
consumption
of
well-water
from
different
parts of
Abeokuta
metropolis
by
measuring
the
concentrations
of
222Rn
and
220Rn
in
well-water
samples
using
two
types of
solid
state
nuclear
track
detector;
namely,
CR-39
and
LR-115.
At each
well
location,
water
sample
of 3.7ml
was
dispensed
into two
specially
designed
plastic
cups.
The two
detectors
were
exposed
to alpha
particles
emitted
by
222Rn,
220Rn
and
their
decay
products
emanating
from
each
water
sample
for
forty
days.
The
222Rn
concentration
obtained
ranged
from 3.1
to 90.8
kBq/m3.
The
statistical
analysis
of radon
concentration
showed
that 94%
of the
wells
studied
had
radon
concentration
above
the
United
States
Environmental
Protection
Agency’s
maximum
contaminant
level of
11.1 kBq/m3,
while
none of
the
samples
had up
to 1000
kBq/m3
above
which
remedial
action
is
recommended
by the
European
Union.
... |
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J. A.
Rabiu,
O. A.
Mustapha,
V.
Makinde
and
A.M.
Gbadebo
JJP,
2017, 10(3)
,
153-164
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Electromagnetic
Transmission
from a
Dielectric
Loaded
Resistive
Cylindrical
Pipe
We
obtained
analytically
closed
form
expressions
for
longitudinal
electric
impedance
and
transmission
coefficient
of a
dielectric
loaded
resistive
cylindrical
pipe of
finite
thickness.
These
expressions
are
valid
for an
axial
current
in a
form of
a point
source
moving
parallel
to the
pipe
axis
with an
offset
a.
The
resistive–wall
impedance
and the
transmission
coefficient
have
been
numerically
visualized
for some
representative
machine
parameters.
For wall
thicknesses
less
than the
skin
penetration
depth,
the wall
becomes
transparent
for the
excited
electromagnetic
fields.
Very
good
shielding
for
standard
operation
can be
achieved
by thin
metallic
walls of
thicknesses
of the
order of
few skin
penetration
depths.
... |
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M. S.
Bawa’aneh,
A. M.
Al-Khateeb
and
N. Laham
JJP,
2017, 10(3)
,
165-172
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