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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......
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......
Computational study on effects of rib height and thickness on heat transfer enhancement in a rib roughened square channel
Sādhanā - Tập 41 - Trang 667-678 - 2016
A computational study was carried out
for the heat transfer augmentation in a three-dimensional square channel fitted with different types of ribs. The standard k–ε model and its two variants (RNG and realizable) were used for turbulence modeling. The predictions were compared with available experimental and computational results. Three rib configurations were used in the present study: 90° conti......
Measuring congestion by anchor points in DEA
Sādhanā - Tập 45 - Trang 1-10 - 2020
One of the most important issues in microeconomics is congestion. In general, an increase in inputs will result in an increase in outputs. However, in some cases, it does not happen. Hence, in these situations congestion occurs. The existence of the congestion reduces efficiency of Decision Making Units (DMUs), so determination of congestion is highly regarded. Some studies suggested methods to de......
Photocatalytic degradation in silver doped TiO2
Sādhanā - Tập 44 - Trang 1-6 - 2019
Many intriguing ways have been identified to mitigate the low photocatalytic activity of Titanium dioxide (TiO2). One of the ways is to adulterate the structure of TiO2 with foreign substances like metals i.e., Ni2+, Zn2+, Cr3+ and Fe3+, which are having similar radii with Ti4+. In this study, the introduction of silver into the structure of TiO2 by Liquid Impregnation (LI) method with various mol......
Compact reconfigurable antenna for LTE, WLAN and WiMAX applications
Sādhanā - Tập 46 - Trang 1-8 - 2021
A compact rectangular patch antenna is presented in this work, which is able to change the frequency of operation and also the radiation pattern. The designed antenna can be used for long-term evolution (LTE), wireless local area network (WLAN), and microwave connectivity worldwide interoperability (WiMAX) applications. A PIN diode is used to connect or disconnect the L-shaped strip from the recta......
Weighted Moore–Penrose generalized matrix inverse: MySQL vs. Cassandra database storage system
Sādhanā - - 2016
The research in this paper refers to two areas: programming and data storage (data base) for computing the weighted Moore–Penrose inverse. The main aim of this paper analysis of the execution speed of computing using PHP programming language and data store. The research shows that the speed of execution gives considerable difference between the Procedural programming and Object Oriented PHP langua......
Elasto-plastic strain analysis by a semi-analytical method
Sādhanā - Tập 33 - Trang 403-432 - 2008
The aim of this paper is to develop a simulation model of large deformation problems following a semi-analytical method, incorporating the complications of geometric and material non-linearity in the formulation. The solution algorithm is based on the method of energy principle in structural mechanics, as applicable for conservative systems. A one-dimensional solid circular bar problem has been so......
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