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Chakraborty A.,IIT
Renewable and Sustainable Energy Reviews | Year: 2011

The whole world is now concentrating on advancing their pool of renewable energy resources. Immense growth has happened in the field of renewable energy and the energy harvesting methods in the past decade. It is estimated that there is still a huge potential of growth remaining in the field of renewable energy resources in the coming years. Generation of renewable energy at the source end to the transmission of the energy to the utility end is done at various interstates coupled with power electronic equipments and systems. Applications of power electronics are expanding at a high pace in industrial power generation, utility, grid integration, and transmission environments due to the advancements in technology and reduction in cost and size of the components and systems. There are numerous multistage converters and inverters topologies being developed for processing and delivering the gigawatt level of renewable power being produced. This paper highlights the growth of power electronics starting from semiconductor type switching devices to various multistage topologies which will extensively contribute to the development and growth of renewable energy resources around the globe. It is a fact that power electronics is an integral part of renewable energy generation and utilization and its optimization of size, cost, and performance is necessary for the most efficient harvesting. Latest advancements in the various ratings of switching devices and components are discussed in the paper. Proper topology based implementation of power electronics and motor drives in the generation of various renewable energy sources such as solar power, wind power, fuel cells, biomass, and other energy storage elements are discussed in details. Individual sources of renewable energy resources interfaced with multistages of power electronic systems are elaborated in the paper. © 2010 Elsevier Ltd. All rights reserved. Source

Gupta M.P.,IIT
International Journal of Electronic Government Research | Year: 2010

An attempt is made in this article to gain an understanding of the evolution of Electronic Governance (E-governance) in India. The initial part of the article examines the Historical Perspectives and the evolution of E-governance in India since the formation of the Department of Electronics. The following sections give a detailed study about the initiatives taken by the Government of India over periods of five years and their Missions and Objectives in the creation of a "Transparent and Efficient Govern ability" from grass root levels. The relative development with the induction of these technologies through various policies and reforms are mapped against the projects and gauge the significant impact on the ability of our government to establish the current E-governance structures. © 2010, IGI Global. Source

Tripathi B.K.,Indian Institute of Technology Kanpur | Kalra P.K.,IIT
IEEE Transactions on Neural Networks | Year: 2011

This paper describes an artificial neuron structure and an efficient learning procedure in the complex domain. This artificial neuron aims at incorporating an improved aggregation operation on the complex-valued signals. The aggregation operation is based on the idea underlying the weighted root-power mean of input signals. This aggregation operation allows modeling the degree of compensation in a natural manner and includes various aggregation operations as its special cases. The complex resilient propagation algorithm (ℂ-RPROP) with error-dependent weight backtracking step accelerates the training speed significantly and provides better approximation accuracy. Finally, performance evaluation of the proposed complex root-power mean neuron with the ℂ-RPROP learning algorithm on various typical examples is given to understand the motivation. © 2011 IEEE. Source

Kondraivendhan B.,Indian Institute of Technology Delhi | Bhattacharjee B.,IIT
ACI Materials Journal | Year: 2010

In this study, the effect of age and water-cement ratio (w/c) on size and dispersion of pores for ordinary portland cement (OPC) paste was determined through mercury intrusion porosimetry (MIP). The cement paste specimens were prepared from two different grades of OPC with a w/c of 0.2, 0.3, 0.4, 0.5, and 0.6, and were tested at different curing ages from 1 day to 150 days. The relationships involving w/c and age with a mean distribution radius (r 0.5) and coefficient d representing the dispersion of pore sizes are presented for both types of OPC pastes. Utility of the aforementioned relationship is demonstrated by relating the compressive strength of cement paste and the mean distribution radius estimated from mixture factors. The estimated pore size distribution (PSD) parameters are compared with the experimentally determined PSD parameters, and the observed variation between them is also discussed. Copyright © 2010. American Concrete Institute. All rights reserved. Source

A network capable of being used in a datacenter is described. In some embodiments, the network can comprise a set of optical fiber rings, wherein each optical fiber ring carries data traffic on one or more wavelengths, and wherein each optical fiber ring is partitioned into multiple sectors. A reconfigurable optical add-drop multiplexer (ROADM) can be coupled to at least one optical fiber in each of at least two sectors. An electro-optical-switch can be coupled to each ROADM in each of the at least two sectors. A set of switches can be coupled to each electro-optical-switch in each of the at least two sectors. The set of switches can comprise a first layer of aggregation switches that is coupled to a second layer of edge switches, wherein the edge switches can be coupled to servers in a datacenter.

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