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Volume 9, No. 1,
2016, 1437 H
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English
Articles |
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About
the
Cosmological
Constant,
Acceleration
Field,
Pressure
Field
and
Energy
Based on
the
condition
of
relativistic
energy
uniqueness,
the
calibration
of the
cosmological
constant
was
performed.
This
allowed
to
obtain
the
corresponding
equation
for the
metric
and to
determine
the
generalized
momentum,
the
relativistic
energy,
momentum
and mass
of the
system,
as well
as the
expressions
for the
kinetic
and
potential
energies.
The
scalar
curvature
at an
arbitrary
point of
the
system
equaled
zero, if
the
matter
is
absent
at this
point;
the
presence
of a
gravitational
or
electromagnetic
field is
enough
for the
space-time
curvature.
Four-potentials
of the
acceleration
field
and
pressure
field,
as well
as
tensor
invariants
determining
the
energy
density
of these
fields,
were
introduced
into the
Lagrangian
in order
to
describe
the
system’s
motion
more
precisely.
... |
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Sergey
G.
Fedosin
JJP,
2016, 9(1)
,
1-30
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Fine
Particle
Number
Concentrations
in Amman
and
Zarqa
during
Spring
2014
We
measured
the fine
particle
number
concentrations
at four
sites in
Amman
and one
site in
Zarqa
during
March 6
– May
28,
2014.
These
were
urban
except
for one,
which
was a
sub-urban
site.
The
highest
number
concentrations
(24-hour
median
as high
as
5.2×104
cm-3)
were
observed
at Hai
Masoum;
an urban
site in
Zarqa
influenced
by
traffic
and
industrial
activities.
In
Amman,
the
highest
number
concentrations
were
observed
at the
urban
residential
sites
(Umm
Summaq
and Al-Hashmi
Al-Shamali,
24-hour
median
as high
as
4.6×104
cm-3),
whereas
the
lowest
was at
the
sub-urban
site (Shafa
Badran,
24-hour
median
as high
as
2.3×104
cm-3).
The
daily
pattern
of the
fine
particle
number
concentrations
was
characterized
by three
peaks
during
the
daytime.
... |
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T.
Hussein,
M.
Halayaka,
R. Abu
Al-Ruz,
H.
Abdullah,
B.
Mølgaard
and
T.
Petäjä
JJP,
2016,
9(1)
,
31-46
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Influence
of
Current
Density
on
Morphology
of
Electrochemically
Formed
Porous
Silicon
Porous
silicon
samples
were
prepared
by
electrochemical
anodic
etching
of
p–type
silicon
wafer in
hydrofluoric
(HF)
acid-based
solution.
The
electrochemical
process
allowed
precise
control
of
porous
silicon
properties,
such as
average
pore
diameter,
average
pore
depth
and
porosity.
The
effect
of
current
density
on
physical
properties
of
porous
silicon
was
investigated
by
Scanning
Electron
Microscopy
(SEM),
I-V
characteristics
and
Fourier
Transform
Infrared
(FTIR)
spectroscopy.
The
average
pore
diameter
and
average
pore
depth
were
found to
increase
with the
increase
in
current
density.
... |
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Ammar M.
Al-Husseini
JJP,
2016,
9(1)
,
47-54
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Radionuclides
Measurements
in Some
Rock
Samples
Collected
from the
Environment
of
Hebron
Governorate
-Palestine
Using
high-resolution
γ- ray
spectroscopy,
the
activity
concentrations
of some
radioactive
isotopes
such as
238U,
232Th
and
40K
in
different
rock
samples,
collected
from 31
quarries
in
Hebron
Governorate,
Palestine
were
measured.
For this
purpose,
62 rock
samples
were
gathered
from
different
quarries
of the
region
under
investigation.
The
measured
activities
of
238U,
232Th
and
40K
were
found to
range
from
21.3 to
100.5,
1.3 to
11.6 and
13 to
583 Bqkg-1,
with
average
values
of 47.6,
4.2 and
100 Bqkg-1,
respectively.
...
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K. M.
Thabayneh,
L. A.
Mashal,
K. M.
Awawdeh
and
M. M.
Abu-Samreh
JJP,
2016,
9(1)
,
55-64
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The
Study of
Zero-Spin
Isotopes
with the
Modified
Manning-Rosen
Potential
by
Relativistic
Cluster
Models
In this
paper,
we
studied
the
zero-spin
isotopes
with N=Z
and A=4n
in
relativistic
cluster
models
as a
system
which
can be
considered
to be
composed
of
α-particles.
For
interaction
between
the
clusters,
we use
modified
Manning-Rosen
potentials
and
solve
the
relativistic
Klein-Gordon
(KG)
equation
using
the
Nikiforov-Uvarov
(NU)
method
to
calculate
the
energy
spectrum.
We found
the
ground
state
energy
and the
first
excited
energy.
Finally,
the
calculated
results
are
compared
with the
experimental
data for
light
nuclei,
such as
8Be, 12C
and 16O.
The
results
show
that the
modified
Manning-Rosen
(MR)
potential
is
adaptable
for
cluster
interactions. |
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Mohammad
Reza
Shojaei
JJP,
2016,
9(1),
65-70
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