The log periodic antenna and Yagi-Uda antenna are used in the applications where very high directivity is required. They also give very high gain in the range of 17-20dBi. This paper presents a review on various configurations of log periodic and Yagi antennas, their advantages and problems. One problem encountered with Yagi-Uda antenna is relatively less bandwidth. This problem is solved by lo...

Stable isotopes are non-radioactive, safe and are applied for various purposes in human health assessment in trace amounts that minimally disturb normal physiology. The International Atomic Energy Agency supports the use of stable isotope techniques to design and evaluate interventions addressing malnutrition in all its forms with focus on infant and young child feeding; maternal and adolescent...

The cost to feed parts to a robot for either machine loading or assembly in a flexible manufacturing system (FMS) has often been underestimated. A recent survey on part-feeding methods applicable to a board class of flexible manufacturing systems has indicated that part-feeding may comprise two-thirds of the overall investment and are usually the source of a large percentage of work stoppage an...

In the Galápagos Islands climate and food abundance vary strongly among vegetation zones and between seasons. We studied the foraging behavior of four mainly insectivorous Darwin’s finch species on Santa Cruz Island. We compared foraging behavior between (1) the arid zone, where food is scarce, with the humid Scalesia zone, where food is abundant; and (2) within each zone between dry and wet se...

The adoption of intensified cattle-feeding techniques by smallholders in SubSaharan Africa has been slower than anticipated. This study seeks to better define and understand the role of local collective action in conditioning the strategies that smallholders choose to intensify their cattle-feeding techniques. Collective action was analyzed as a determinant of the transaction costs of accessing...