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Vishakhapatnam, India

Andhra University or Andhra Viswa Kala Parishad , located in Visakhapatnam, north east coastal Andhra Pradesh, is one of the older premier universities in India with a broad focus. Presently it is among the top universities in India for Engineering, Science and Economics. It was established in 1926 and shared affiliating responsibilities with Madras University in the initial years.It is highly rated by NAAC with A rating with a score of 3.65 out of 4. The University designed and implemented Quality Management System successfully and became the first general University in the country to get ISO 9001: 2000 Certification in 2006. Wikipedia.


Subba Rao N.,Andhra University
Environmental Monitoring and Assessment | Year: 2011

Fluoride (F-) is essential for normal bone growth, but its higher concentration in the drinking water poses great health problems and fluorosis is common in many parts of India. The present paper deals with the aim of establishment of facts of the chemical characteristics responsible for the higher concentration of F- in the groundwater, after understanding the chemical behavior of F- in relation to pH, total alkalinity (TA), total hardness (TH), carbonate hardness (CH), non-carbonate hardness (NCH), and excess alkalinity (EA) in the groundwater observed from the known areas of endemic fluorosis zones of Andhra Pradesh that have abundant sources of F --bearing minerals of the Precambrians. The chemical data of the groundwater shows that the pH increases with increase F-; the concentration of TH is more than the concentration of TA at low F- groundwater, the resulting water is represented by NCH; the TH has less concentration compared to TA at high F- groundwater, causing the water that is characterized by EA; and the water of both low and high concentrations of F- has CH. As a result, the F- has a positive relation with pH and TA, and a negative relation with TH. The operating mechanism derived from these observations is that the F- is released from the source into the groundwater by geochemical reactions and that the groundwater in its flowpath is subjected to evapotranspiration due to the influence of dry climate, which accelerates a precipitation of CaCO3 and a reduction of TH, and thereby a dissolution of F-. Furthermore, the EA in the water activates the alkalinity in the areas of alkaline soils, leading to enrichment of F-. Therefore, the alkaline condition, with high pH and EA, and low TH, is a more conducive environment for the higher concentration of F- in the groundwater. © 2010 Springer Science+Business Media B.V. Source


Senthilkumaran B.,Andhra University
Frontiers in Bioscience | Year: 2011

Meiotic maturation is a complex process that involves resumption of meiosis in response to preovulatory luteinizing hormone (LH) surge just before ovulation. High levels of cAMP in oocytes maintain meiotic arrest at diplotene of prophase I in mammals and pisces. In mammals, the process by which LH induces recommencement of meiosis involves breakdown of oocyte-somatic cells communication, which is followed by a drop in intracellular cAMP levels that in turn causes exit from meiotic arrest. Maturation promoting factor (MPF) then accomplishes progression of oocytes to reach first metaphase followed by second metaphase after reinitiating meiosis. Pisces require precise completion of oocyte growth involving vitellogenesis before the entry of meiotic maturation. Then, both mammalian and fish oocytes enters resumption of meiosis involving germinal vesicle breakdown, chromosome condensation, assembly of meiotic spindle, and formation of first polar body. However, this process in pisces is regulated by three major mediators, LH, 17alpha,20beta-dihydroxy progesterone and MPF which are unique. The molecular mechanisms of meiotic maturation and ovulation by comparing mammalian and piscine research have been dealt in this review. Source


Prema Kumar N.,Andhra University
International Journal of Electrical Power and Energy Systems | Year: 2013

Distributed generation (DG) sources are predicated to play major role in distribution systems due to the demand growth for electrical energy. Location and sizing of DG sources found to be important on the system losses and voltage stability in a distribution network. In this paper an efficient technique is presented for optimal placement and sizing of DGs in a large scale radial distribution system. The main objective is to minimize network power losses and to improve the voltage stability. A detailed performance analysis is carried out on 33-bus, 69-bus and 118-bus large scale radial distribution systems to demonstrate the effectiveness of the proposed technique. Performing multiple power flow analysis on 118-bus system, the effect of DG sources on the most sensitive buses to voltage collapse is also carried out. © 2012 Elsevier Ltd. All rights reserved. Source


Vaisakh K.,Andhra University
Electric Power Systems Research | Year: 2013

In this paper, a novel metaheuristic optimization methodology is proposed to solve large scale nonconvex economic dispatch problem. The proposed approach is based on a hybrid shuffled differential evolution (SDE) algorithm which combines the benefits of shuffled frog leaping algorithm and differential evolution. The proposed algorithm integrates a novel differential mutation operator specifically designed to effectively address the problem under study. In order to validate the SDE methodology, detailed simulation results obtained on three standard test systems 13, 40, and 140-unit test system are presented and discussed. Transmission losses are considered along with valve point loading effects for 13 and 40-unit test systems and calculated using B-coefficient matrix. A comparative analysis with other settled nature-inspired solution algorithms demonstrates the superior performance of the proposed methodology in terms of both solution accuracy and convergence performances. © 2012 Elsevier B.V. Source


Vaisakh K.,Andhra University
International Journal of Electrical Power and Energy Systems | Year: 2013

This paper proposes a novel metaheuristic optimization methodology aimed at solving economic dispatch problem considering valve point loading effects. The proposed approach is based on a hybrid shuffled differential evolution (SDE) algorithm which combines the benefits of shuffled frog leaping algorithm and differential evolution. The SDE algorithm integrates a novel differential mutation operator specifically designed to effectively address the problem under study. In order to validate the proposed methodology, detailed simulation results obtained on three standard test systems are presented and discussed. A comparative analysis with other settled nature-inspired solution algorithms demonstrates the superior performance of the proposed methodology in terms of both solution accuracy and convergence performances. © 2012 Elsevier Ltd. All rights reserved. Source

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