Scientific Research Publishing

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53870#.VNm4MCzQrzE Author(s)    Dan Zhu 1 , Michael Kung 2 , Liang Zhou 3,4   Affiliation(s) 1 College of Design, Construction and Planning, University of Florida, Gainesville, USA . 2 College of Education, University of Florida, Gainesville, USA . 3 School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing, China . 4 Department of Geography, Indiana University, Bloomington, USA . ABSTRACT This paper explores sustainable energy systems in ecovillages based on the concept of the Zero Energy Building. The cases discussed in this paper include BedZED in the United Kingdom and Masdar City in the Middle East. These two communities contain features characterized by the sustainable principles of the ecovillage concept by using renewable energy and reclaimed materials to reach a low/zero energy system in buildings. The creation of mo...

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=52854#.VKs-ecnQrzE Author(s)    Soichi Sasaki , Ryo Sakada , Kota Suzuki Affiliation(s) Graduate School of Engineering, Nagasaki University, Nagasaki, Japan . ABSTRACT To discuss the relationship between the periodicity noise and the aerodynamic noise source of a wind turbine, the characteristics of the actual wind turbine were measured by a wind tunnel; moreover, the flow around the impeller immersed in the uniform flow was solved by numerical simulation. In the observed wind turbine, when the mainstream velocity was 7.4 m/s or more, the power coefficient reached maximum at tip speed ratio 8. When the mainstream veloci...

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=52455#.VJjJdcCAM4 Author(s)   Stephen Mutimba 1* , Francis X. Mkanda 2 , Richard Kibulo 1 Affiliation(s) 1 Camco Advisory Services (K) Ltd., Nairobi, Kenya . 2 Sustainable Land Management Project, Kilimanjaro, Tanzania . ABSTRACT The sustainable land management (SLM) project is seeking to engage with public institutions to explore the possibility of using the energy-switch principle presented by the carbon market to reduce emissions from inefficient use of biomass energy and discharge of human waste into the environment. Such a switch will be a triple-win situation that improves the natural environment, reduces deforestation,...

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=49269#.VJD-RMnQrzE Author(s)   Zhiqiang Jin , Can Huang Affiliation(s) Department of Electrical Engineering and Computer Science, University of Tennessee, Knoxville, USA . Department of Electrical Engineering and Computer Science, University of Tennessee, Knoxville, USA . ABSTRACT The increasing penetration of wind power presents many technical challenges to power system operations. An important challenge is the need of voltage control to maintain the terminal voltage of a wind plant to make it a PV bus like conventional generators with excitation control. In the previous work for controlling wind plant, especially the Doub...