Ultrathin oxides ( < 5 nm) of silicon have gained tremendous importance in the context of silicon submicron devices. In the present study ultrathin oxides of silicon are grown by wet oxidation (at ...800 degree C) at different water vapor pressures in the range 0.04-1.0 atm. Oxide growth rate is studied as a function of water vapor pressure. The ultrathin oxides grown with this approach are characterized by fabricating MOS tunnel diodes and by studying their capacitance-voltage (C-V), current-voltage (I-V) and charge trapping characteristics as well as the breakdown field. It is shown that the ultrathin oxides grown by wet oxidation method at low water vapor pressure have excellent thickness uniformity and high break down field strength. copyright Elsevier Science Ltd. All rights reserved.
Armour steel plates of 25mm thickness were tempered at various temperatures from 200°C to 600°C and tested against ballistic impact of 7.62mm AP projectiles. Hardness decreases with increase in ...tempering temperature resulting in corresponding increase in depth of penetration. Least depth of penetration was observed in the plate tempered at 200°C. Post-impact microstructure of the crater region in the tested plates show adiabatic shear band (ASB) induced cracking for tempering temperatures up to 400°C and no ASB is seen for 600°C. ASB induced cracking was also observed in the crater region of a 5mm thick plate tempered at 200°C and tested under similar conditions. Plates of thickness 5mm with drilled holes of diameter nearly equal to that of the projectile were also tested. The result showed that ASB formation can be partially inhibited in these plates due to presence of holes.
► Effect of tempering temperature on ASB formation has been studied. ► ASB induced cracking disappears at 500°C. ► Effects of presence of holes on ASB formation have been studied. ► The presence of holes inhibits ASB formation.
Background: Cirrhosis can cause various cardiac complications and severely affect the prognosis of the patient suffering from cirrhosis. Anatomical, morphological variations in the heart of patients ...with liver cirrhosis in the absence of known cardiac disease has not been well described. There is a paucity of studies in the literature on cardiac alterations in cirrhosis. Early detection of known cardiac alterations can further help in improving the quality of life.
Materials and Methods: A cross-sectional descriptive study was conducted in the departments of pathology and forensic medicine of our institution. An autopsy-based prospective study of forty consecutive patients with final diagnosis of liver cirrhosis were included. Patients with a known history of cardiac disease/anomaly were excluded from the study. Macroscopic and microscopic changes in the heart and coronaries were noted and statistically analyzed.
Results: Analysis of the hearts on gross examination showed cardiomegaly in 31 patients (77.5%). All cases had left ventricular hypertrophy. Endocardial thickening was seen in 22 patients (55%). Calcified mitral valve was seen in 9 patients (22.5%).
On microscopy, apart from hypertrophy, the pathological changes like interstitial oedema (47.5%), fibrosis (45%), cardiac muscle disarray (87.5%), fatty infiltrate (10%), pericarditis (5%), and severe coronary artery atherosclerosis (17.5%) were seen in the patients.
Conclusion: Knowledge about the involvement of the heart in liver cirrhosis is essential for both the physician and the surgeons to prevent adverse outcomes during liver transplantation and can further help in improving the quality of life of the patient.
The one dimensional copper(II) coordination polymer {Cu(phen)(bpe)(NO
3
)(H
2
O)(NO
3
)(H
2
O)}
n
(
1
) has been synthesized using Cu(phen)
2
(NO
3
)
2
(where phen = 1′10-phenanthroline and linker ...bpe = 1,2-bis-(4-pyridyl) ethane. Complex
1
was characterised by using elemental analysis, IR spectroscopy and single crystal X-ray diffraction analysis. The copper(II) ion is octahedrally coordinated with two nitrogen donor atoms from two bpe, two nitrogen donor atoms from phen, one oxygen donor atom from water and one oxygen donor atom from nitrato. Each 1D polymeric chain is connected to another chain
via
hydrogen bonding and π…π stacking interaction to form 3D network structures.
A
bstract
The
p
T
-differential production cross sections of prompt and non-prompt (produced in beauty-hadron decays) D mesons were measured by the ALICE experiment at midrapidity (
|
y
|
<
0
.
5) in ...proton-proton collisions at
s
= 5
.
02 TeV. The data sample used in the analysis corresponds to an integrated luminosity of (19
.
3
±
0
.
4) nb
−
1
. D mesons were reconstructed from their decays D
0
→
K
−
π
+
, D
+
→
K
−
π
+
π
+
, and
D
s
+
→
ϕ
π
+
→
K
−
K
+
π
+
and their charge conjugates. Compared to previous measurements in the same rapidity region, the cross sections of prompt D
+
and
D
s
+
mesons have an extended
p
T
coverage and total uncertainties reduced by a factor ranging from 1.05 to 1.6, depending on
p
T
, allowing for a more precise determination of their
p
T
-integrated cross sections. The results are well described by perturbative QCD calculations. The fragmentation fraction of heavy quarks to strange mesons divided by the one to non-strange mesons,
f
s
/
(
f
u
+
f
d
), is compatible for charm and beauty quarks and with previous measurements at different centre-of-mass energies and collision systems. The
b
b
¯
production cross section per rapidity unit at midrapidity, estimated from non-prompt D-meson measurements, is
d
σ
b
b
¯
/
d
y
y
<
0.5
=
34.5
±
2.4
stat
−
2.9
+
4.7
tot
.
syst
μb. It is compatible with previous measurements at the same centre-of-mass energy and with the cross section pre- dicted by perturbative QCD calculations.
The observations of the exceptionally bright gamma-ray burst (GRB) 130427A by the Large Area Telescope aboard the Fermi Gamma-ray Space Telescope provide constraints on the nature of these unique ...astrophysical sources. GRB 130427A had the largest fluence, highest-energy photon (95 GeV), longest γ-ray duration (20 hours), and one of the largest isotropie energy releases ever observed from a GRB. Temporal and spectral analyses of GRB 130427A challenge the widely accepted model that the nonthermal high-energy emission in the afterglow phase of GRBs is synchrotron emission radiated by electrons accelerated at an external shock.
This paper presents the measurements of
π
±
,
K
±
,
p
and
p
¯
transverse momentum (
p
T
) spectra as a function of charged-particle multiplicity density in proton–proton (pp) collisions at
s
=
13
TeV
...with the ALICE detector at the LHC. Such study allows us to isolate the center-of-mass energy dependence of light-flavour particle production. The measurements reported here cover a
p
T
range from 0.1 to 20
GeV
/
c
and are done in the rapidity interval
|
y
|
<
0.5
. The
p
T
-differential particle ratios exhibit an evolution with multiplicity, similar to that observed in pp collisions at
s
=
7
TeV
, which is qualitatively described by some of the hydrodynamical and pQCD-inspired models discussed in this paper. Furthermore, the
p
T
-integrated hadron-to-pion yield ratios measured in pp collisions at two different center-of-mass energies are consistent when compared at similar multiplicities. This also extends to strange and multi-strange hadrons, suggesting that, at LHC energies, particle hadrochemistry scales with particle multiplicity the same way under different collision energies and colliding systems.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Objectives
To measure the oxidative stress and antioxidant status in preeclamptic mother-newborn dyads and correlate them with neurodevelopmental outcome at one year of corrected age.
Methods
This ...cohort study conducted in a tertiary care teaching hospital, south India included 71 preeclamptic and 72 normal mother-newborn dyads. Biochemical parameters including total antioxidant status (TAS), protein carbonyls and malondialdehyde levels (MDA) were measured in both maternal and cord blood. Infants in both the groups were followed up to one year of corrected age and neurodevelopmental assessment was done using Developmental Assessment Scale for Indian Infants (DASII). Correlation and multivariate regression analysis was done to evaluate the oxidative stress markers in relation to neurodevelopmental outcome.
Results
All oxidative stress markers were higher in maternal and cord blood of pre-ecclampsia group compared to the normal group. Maternal Total antioxidant status (M-TAS) was lower in pre-eclampsia group than normal group. More neonates in the pre-ecclampsia group were preterm and intrauterine growth restriction (IUGR) and had higher incidence of morbidities like respiratory distress syndrome (RDS) and early onset sepsis (EOS). Infants in the preeclampsia group had lower motor age, motor score and motor developmental quotient (MoDQ). On multivariate logistic regression analyses, lower M-TAS levels were strongly associated with poor neuro-motor outcomes at 1 y of corrected age. Maternal TAS with a cut-off value of 0.965 mmol/L had a sensitivity of 77.8% and specificity of 55.3% in predicting MoDQ <70 at one year corrected age in infants born to preeclamptic mothers.
Conclusions
Oxidative stress is increased in preeclamptic mother-newborn dyads. Low maternal TAS levels are associated with poor neuro-motor outcomes. Maternal TAS in preeclampsia is useful in predicting poor motor development at one year corrected age.
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