1,466 research outputs found
Combining Ability Studies in Muskmelon (Cucumis melo L.)
The parent Hara Madhu in E1, AMM-01-18 and AMM-02 -26 in E2 and AMM-01-18, AMM-02-26 and Hara Madhu on pooled basis exhibited positive and significant GCA effects for fruit yield per plant. Thus these three parents appeared to be good general combiners for fruit yield. Out of these parents AMM-01-18 had a good combining ability for fruit yield per plant, number of primary branches, number of fruits per plant, fruit weight, moisture content, total soluble solids, acidity and total soluble sugars on pooled basis. Specific combining ability effects for fruit yield and yield attributing traits revealed significant and positive SCA effects in fourteen crosses for number of primary branches per plant, nine for fruit length, twelve for fruit girth, ten for fruits per plant, eleven for fruit weight, nine for fruit yield per plant, eleven for flesh thickness, nine for moisture content, twenty for total soluble solids, twenty for acidity and fifteen for total soluble sugars data in the desired direction in pooled analysis. However, some crosses like AMM-01-18 x AMM-02-26, Hara Madhu x RM-50 and AMM- 01-18 x DM-1 exhibited significant SCA effects for fruit yield per plant over environments along with some of the component traits in different environments
Stability of a high Mach number flow in a channel
Modal instabilities in a flow through a channel at high Reynolds and Mach
numbers are studied for three-dimensional perturbations. In addition to the
Tollmien-Schlichting modes, there exist higher modes in a channel flow that do
not have a counterpart in the incompressible limit. The stability
characteristics of these higher modes, obtained through numerical calculations,
are compared with boundary layer and Couette flows that have been previously
studied. The dominant higher mode instabilities in a channel flow are shown to
be viscous in nature, in contrast to compressible boundary layer modes. For
general compressible bounded-domain flows, a necessary condition for the
existence of neutral modes in the inviscid limit is obtained. This criterion is
used to construct a procedure to determine a critical value of Mach number
below which the higher modes remain stable. This criterion also delineates a
range of angles of inclination of the wave number with respect to the flow
direction which could go unstable at a specified Mach number. Asymptotic
analysis is carried out for the lower and upper branch of the stability curve
in the limit of high Reynolds number. A common set of relations are identified
for these exponents for the upper and lower branch for the continuation of the
Tollmien-Schlichting modes and the compressible modes. The scalings for the
Tollmien-Schlichting modes are identical to those for an incompressible flow.
The scalings for the finite wave number modes are different; the wave speed
scales as \mbox{Re}^{-\frac{1}{3}} for the lower branch and
\mbox{Re}^{-\frac{1}{5}} for the upper branch, where \mbox{Re} is the
Reynolds number. The asymptotic analysis shows that the stability boundaries
for three-dimensional perturbations at high Reynolds numbers can be calculated
from the strain rate and the temperature of the base flow at the wall.Comment: 59 pages, 10 figure
Anomalous change in leakage and displacement currents after electrical poling on lead-free ferroelectric ceramics
We report the polarization, displacement current and leakage current behavior
of a trivalent nonpolar cation Al cation substituted lead free ferroelectric
NBT-BT electroceramics with tetragonal phase and P4mm space group symmetry.
Nearly three orders of magnitude decrease in leakage current were observed
under electrical poling, which significantly improves microstructure,
polarization, and displacement current. Effective poling neutralizes the domain
pinning, traps charges at grain boundaries and fills oxygen vacancies with free
charge carriers in matrix, thus saturated macroscopic polarization in contrast
to that in upoled samples. E-poling changes bananas type polarization loops to
real ferroelectric loops.Comment: 18 pages, 5 figure
Heterosis Studies in Muskmelon (Cucumis melo L.)
Ten parental lines and 45 F1 hybrids of muskmelon obtained from half dialleles were studied to investigate the extent of heterosis in muskmelon. Heterotic effects over the better parent were observed to be higher for number of the node on which first female flower appeared, fruits per plant, fruit weight, fruit yield per plant, moisture content and total soluble sugars in E2 than in E1. The hybrids AMM-01-18 x AMM-02-26, Hara Madhu x RM- 50, AMM-00-25 x AMM-00-11 and AMM-01-18 x DM-1 were found to be high-yielding and heterotic in both the seasons studied and even when averaged over the two environments, with other yield attributes and quality traits. Hence, after sufficient evaluation, these hybrids were identified as potential hybrids for widespread cultivation and commercial exploitation
Extended Bandwidth Optimized and Energy Efficient Dynamic Source Routing Protocol in Mobile Ad-hoc Networks
With the increase in the evolution of wireless communication, the ad-hoc networks are gaining attention and are significantly becoming the technology solutions to the various problems. Mobile ad-hoc Networks (MANETs) are envisaged to grow as a main component in the today 4G architecture, and ad hoc networks are projected to be a significant element of the whole future wireless communication. The MANETs are infrastructure less, self-forming and self-organizing network in which there is no control of any centralized entity. The nodes are free to move around the network with dynamic topology. But this self formation, flexibility and scalability create many challenges and design constraints like hidden terminal, limited bandwidth, limited energy of a node, unpredictable change in the topology etc. Bandwidth and energy are the scarce resources of the network. In order to effectively manage the consumption of bandwidth and energy, an algorithm is proposed which is the extension of traditional Dynamic Source Routing (DSR) reactive routing protocol. The extended protocol applies the mobile agents to carry the data. The proposed work is intended to optimize the bandwidth and making the protocol energy efficient
Conformal solids and holography
We argue that a magnetic monopole in an asymptotically AdS space-time
is dual to a -dimensional strongly coupled system in a solid state. In light
of this, it would be remiss of us not to dub such a field configuration
. In the presence of mixed boundary conditions, a solidon
spontaneously breaks translations (among many other symmetries) and gives rise
to Goldstone excitations on the boundarythe phonons of the solid. We derive
the quadratic action for the boundary phonons in the probe limit and show that,
when the mixed boundary conditions preserve conformal symmetry, the
longitudinal and transverse sound speeds are related to each other as expected
from effective field theory arguments. We then include backreaction and
calculate the free energy of the solidon for a particular choice of mixed
boundary conditions, corresponding to a relevant multi-trace deformation of the
boundary theory. We find such free energy to be lower than that of thermal AdS.
This suggests that our solidon undergoes a solid-to-liquid first order phase
transition by melting into a Schwarzschild-AdS black hole as the temperature is
raised.Comment: 31 pages; v2: incorrect calculation in sec. 4 has been deleted; main
results unchange
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