The performance of solar systems depends on the effective incident energy capture surface. This factor is dependent geographic position, orientation surface, atmospheric conditions, and other geo-climatic factors. Solar trackers, typically uni- biaxial, are used to optimize radiation via movement plane incidence these devices. A reliable estimation gain trackers with respect a fixed surface fac...

The progress of remote sensing (RS), geographic information system (GIS) and global position system (GPS) in China since the early 1980s.The first section introduces the applications of remote sensing to environmental monitoring and resources investigation in tourism. The second section focuses on further analysis of the applications of geographic information system from the point of view of vi...

the location of extracellular enzyme activities in soil aggregates can be influenced by slope position. this study aims to determine the effect of slope position on aggregate distribution of organic c and l-glutaminase activity. the soils were collected from different slope positions (shoulder, backslope, footslope and toeslope) at two pasture ecosystems (fereydoonshahr and chelgerd, central ir...

conclusions to our knowledge, this is the first case of ctc that was identified incidentally in the retrocaval position and caused intermittent obstruction of vena cava. case presentation the present study reports on a 66-year-old female with coronary artery disease (cad) who was scheduled for coronary artery bypass grafting (cabg) at our hospital. during mediastinal exploration and pericardiot...

Multicasting is the transmission of packets to a group of zero or more hosts identified by a single destination address Multicasting is intended for group oriented computing. Typically the members of a host group are dynamic that is hosts may join and leave groups at any time T. In Mobile Ad hoc Networks communication among the groups is more important. To implement group communication we use e...

One commonly asked question when confronted with a photograph is “Where is this place?” When talking about a place mentioned on the Web, the question arises “What does this place look like?” Today, these questions can not reliably be answered for Web images as they typically do not explicitly reveal their relationship to an actual geographic position. Analysis of the keywords surrounding the im...