In this paper, 20 solar-activity phenomena are collected to investigate solar activity in solar cycle 21. The results obtained show that we can hardly say that either the south dominance of solar activity or the north dominance exists for solar cycle 21. It is also inferred in this paper that solar activity in solar cycle 21 has a northern bias at first, then as the cycle progresses, southern p...

Recently, Djurovic and Pâquet (1996) claimed to have found an oscillation with a period of about 5.5 years in several solar and solar-terrestrial parameters, in particular in solar activity as indicated by sunspot numbers. Since the temporal evolution of solar activity and solar-terrestrial environment is of great interest in many fields, we have examined their claim in detail. We show here tha...

Global energy consumption is on the rise and is projected to double by 2050, compared with worldwide energy consumption rates in 2001.1 Sustainable energy production based on the direct conversion of energy radiated from the sun into heat or electricity is expected to gain importance, as it may be the only renewable source capable of generating sufficient energy to meet the long-term worldwide ...

Motivation Policies to promote solar photovoltaic (PV) adoption have been gaining momentum throughout the world, as concerns over global climate change and national security externalities continue to grow. In the US: 30% solar energy federal investment tax credit. Yet we understand very little about the process of diffusion of this technology.

This paper presents a method of modeling and simulation of photovoltaic arrays in MATLAB® /Simulink® using solar cell block from SimElectronics® library. The method is used to determine the characteristic of a particular photovoltaic cell panel and to study the influence of different values of solar radiation at different temperatures concerning performance of photovoltaic cells. This model it ...

Supan Yodyingyong,†,‡ Xiaoyuan Zhou,† Qifeng Zhang,† Darapond Triampo,§ Junting Xi,† Kwangsuk Park,† Benjie Limketkai, and Guozhong Cao*,† Department of Materials Science and Engineering, UniVersity of Washington, Seattle, Washington 98195, United States, Institute for InnoVatiVe Learning, Mahidol UniVersity, 999 Phuttamonthon 4 Road, Nakhon Pathom 73170, Thailand, Department of Chemistry, Cent...

This article examines the theoretical aspects of choosing a tilt angle for the solar flat-plate collectors used at ten different stations in the world and makes recommendations on how the collected energy can be increased by varying the tilt angle. In this paper, the collector surface is assumed to be facing toward equator. For Indian stations, the calculations are based upon the measured value...

23 24 25 26 27 28 29 30 31 32 Article history: Received 27 September 2011 Received in revised form 27 November 2011 Accepted 31 December 2011 Available online xxxx