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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......
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 competiti......
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 ......
Computation of the controllable swing mode spectrum of FACTS and HVDC in large power systems
Sādhanā - Tập 43 - Trang 1-13 - 2018
This paper presents computation of swing modes of a large power system that could be significantly affected by power swing damping controllers in FACTS or HVDC devices at a given location. Modal controllability is a suitable measure to isolate these modes for analysis. Computation of the controllable swing mode spectrum is useful, especially in situations where the controller structure and feedbac......
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