15 research outputs found
Effect of Sintering Temperature on Structural and PiezoelectricProperties of PNN-PZT Ceramics
Sintering temperatures affect the structural and piezoelectric properties of PbNi1/3Nb2/3-PbZrO3-PbTiO3 system considerably; therefore the effect has been studied on mechano-chemicallyprocessed powder. This process involves activating mixed oxides of PbO, NiO, Nb2O5, ZrO2 andTiO2, and in the present study, calcination steps at an intermediate temperatures were skippedwhich are usually required in conventional solid state reaction methods and chemical routes.Single-phase formation was confirmed from XRD patterns which shows rhombohedral structureat higher sintering temperature. Investigations of the microstructure indicate almost linear increasein grain size from 0.98 m to 2.56 m when the sintering temperature was varied from 1050 oC to1150 °C. A high value of planar coupling factor (kp) = 67 per cent and piezoelectric charge coefficient(d 33 ~ 750 pm/V; (as determined from strain versus electric field curve at low field) were obtainedfor the ceramic specimens sintered at 1100 °C. The maximum strain was observed ~ 0.21 per centat 40 kV/cm applied field for the sample sintered at 1100 °C for 4 h
Genome-Wide Association Study for Type 2 Diabetes in Indians Identifies a New Susceptibility Locus at 2q21
Indians undergoing socioeconomic and lifestyle transitions will
be maximally affected by epidemic of type 2 diabetes (T2D). We
conducted a two-stage genome-wide association study of T2D in
12,535 Indians, a less explored but high-risk group. We identified
a new type 2 diabetes–associated locus at 2q21, with the lead
signal being rs6723108 (odds ratio 1.31; P = 3.32 3 1029
). Imputation
analysis refined the signal to rs998451 (odds ratio 1.56;
P = 6.3 3 10212) within TMEM163 that encodes a probable vesicular
transporter in nerve terminals. TMEM163 variants also
showed association with decreased fasting plasma insulin and
homeostatic model assessment of insulin resistance, indicating
a plausible effect through impaired insulin secretion. The 2q21
region also harbors RAB3GAP1 and ACMSD; those are involved
in neurologic disorders. Forty-nine of 56 previously reported signals
showed consistency in direction with similar effect sizes in
Indians and previous studies, and 25 of them were also associated
(P , 0.05). Known loci and the newly identified 2q21 locus altogether
explained 7.65% variance in the risk of T2D in Indians. Our
study suggests that common susceptibility variants for T2D are
largely the same across populations, but also reveals a population-specific
locus and provides further insights into genetic architecture
and etiology of T2D
Magnetic-time model at off-season germination
Effect of static magnetic field on germination of
mung beans is described. Seeds of mung beans, were exposed in
batches to static magnetic fields of 87 to 226 mT intensity for
100 min. Magnetic time constant – 60.743 Th (Tesla hour) was
determined experimentally. High value of magnetic time constant
signifies lower effect of magnetic field on germination rate as this
germination was carried out at off-season (13°C). Using decay
function, germination magnetic constant was calculated. There
was a linear increase in germination magnetic constant with increasing
intensity of magnetic field. Calculated values of mean
germination time, mean germination rate, germination rate coefficient,
germination magnetic constant, transition time, water
uptake, indicate that the impact of applied static magnetic field
improves the germination of mung beans seeds even in off-season
Magnetic-time model at off-season germination
Effect of static magnetic field on germination of
mung beans is described. Seeds of mung beans, were exposed in
batches to static magnetic fields of 87 to 226 mT intensity for
100 min. Magnetic time constant – 60.743 Th (Tesla hour) was
determined experimentally. High value of magnetic time constant
signifies lower effect of magnetic field on germination rate as this
germination was carried out at off-season (13°C). Using decay
function, germination magnetic constant was calculated. There
was a linear increase in germination magnetic constant with increasing
intensity of magnetic field. Calculated values of mean
germination time, mean germination rate, germination rate coefficient,
germination magnetic constant, transition time, water
uptake, indicate that the impact of applied static magnetic field
improves the germination of mung beans seeds even in off-season