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The hydrodynamic analysis of fish propulsion performance and its morphological adaptation
Sādhanā - Tập 18 - Trang 719-728 - 1993
The hydrodynamic performance of fish undulatory swimming has been studied by
means of the linear three-dimensional and the non-linear two-dimensional
waving-plate theories developed recently by the present authors. The
morphological adaptation of the anguilliform mode, carangiform mode, and
lunate-tail swimming propulsion in the biological evolution process of fishes
has been understood tentativel...
Anisotropy of elastic constants ofin situ Pb-Sn eutectic composite measured by pulse-echo method
Sādhanā - Tập 11 - Trang 389-396 - 1987
Anisotropic elastic constants of Pb-Sn eutectic composites with layered
structure have been measured by the pulse-echo method. The magnitude of the
elastic constants was found to vary considerably depending upon the
crystallographic directions as well as the directions relative to the plate-like
eutectic constituents. The elastic constants of Pb-Sn eutectic bicrystal were
determined taking thex1 a...
Simulation of depth of penetration during ballistic impact on thick targets using a one-dimensional discrete element model
Sādhanā - Tập 37 - Trang 261-279 - 2012
One-dimensional discrete element model for the ballistic impact is used to
determine the depth of penetration of a bullet on a thick target. Discrete
Element Method (DEM) is a numerical tool where a continuum is modelled as a
network of masses connected by normal springs. A one-dimensional discrete
element model is developed to obtain the displacements and forces associated
with the ballistic impa...
Rotation-invariant fingerprint matching using radon and DCT
Sādhanā - Tập 42 - Trang 2025-2039 - 2017
A new set of promising rotation-invariant features based on radon and discrete
cosine transform (DCT) is proposed for fingerprint matching. The radon and DCT
of a tiny area in the region of core point of fingerprint image is computed. In
the proposed method only 34% DCT coefficients are used for feature extraction.
Competency of this approach is tested on standard databases, namely FVC2002 and
FVC...
Size dependence of the bulk modulus of Si nanocrystals
Sādhanā - Tập 43 - Trang 1-5 - 2018
This study investigates the effect of size on bulk modulus and its related
parameters, including melting temperature and mass density based on the ratio
number of surface atoms to that of its internal. The equation of bulk modulus in
the bulk state B(∞) is modified to include the related size-dependent parameters
without any adjustable parameter, and is applied to Si nanocrystals. The bulk
modulus...
Some numerical schemes using curvilinear coordinate grids for incompressible and compressible Navier-Stokes equations
Sādhanā - Tập 18 - Trang 431-476 - 1993
In this review paper some numerical schemes recently developed by the authors
and their coworkers for analysing the cascade flows of turbomachinery are
described. These schemes use the curvilinear coordinate grid and solve the
momentum equations of contravariant velocities (volume flux). The compressible
flow schemes are based on the delta-form approximate-factorization
finite-difference scheme, a...
TCP with header checksum option for wireless links: An analytical approach towards performance evaluation
Sādhanā - Tập 32 - Trang 253-275 - 2008
TCP performs poorly in wireless mobile networks due to large bit error rates.
Basically, the TCP sender responds to these losses as if they were due to
congestion in the network, and reduces the congestion window unnecessarily. In
earlier work, it has been shown that adding a TCP header checksum is very useful
in differentiating between congestion loss and corruption loss. With the
modified TCP, r...
Computational model on pulsatile flow of blood through a tapered arterial stenosis with radially variable viscosity and magnetic field
Sādhanā - - 2017
Extending lifetime of wireless sensor networks using multi-sensor data fusion
Sādhanā - Tập 42 - Trang 1083-1090 - 2017
In this paper a multi-sensor data fusion approach for wireless sensor network
based on bayesian methods and ant colony optimization techniques has been
proposed. In this method, each node is equipped with multiple sensors (i.e.,
temperature and humidity). Use of more than one sensor provides additional
information about the environmental conditions. The data fusion approach based
on the competitiv...
Specification of design wind loads in India
Sādhanā - Tập 7 - Trang 259-274 - 1984
Codes in current use in India for specifying design wind loads for structures
are analysed, and shown to be inconsistent with available data on extremes.
Thus, it is found that while the National Building Code specifies the highest
wind loads on the east coast and western Gujarat, the observed extreme winds are
highest in the eastern Gangetic valley. As the consequences of
under-specification can ...
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