Yagi-Uda antennas are known to be difficult to design and optimize due to their sensitivity at high gain, and the inclusion of numerous parasitic elements. We present a genetic algorithm-based automated antenna optimization system that uses a fixed Yagi-Uda topology and a byte-encoded antenna representation. The fitness calculation allows the implicit relationship between power gain and sidelob...

This article presents a model, which uses a fuzzy inference system to evaluate the relevance of a higher educational program in regard to the General Examination for the Degree Exit (EGEL) of the National Center for Higher Education Assessment (CENEVAL). To develop the model the following factors were considered: the impact of each Learning Unit (UDA) on areas EGEL assessment, the score obtaine...

Biogeography is the study of distribution of biological species, over space and time, among random habitats. Recently introduced Biogeography Based Optimization (BBO) is a technique, where solutions of the problem are termed as habitats. Feature, i.e., Suitability Index Variable (SIV), sharing among various habitats is made to occur with migration operator where as exploration of new SIVs is do...

Steady-state kinetic studies of the enzymic glucosyl transfer to and from phosphate catalysed by cellobiose phosphorylase from Cellulomonas uda have shown that this enzyme operates by a ternary-complex kinetic mechanism in which beta-cellobiose binds before phosphate, and beta-D-glucose and alpha-D-glucopyranosyl phosphate are released in that order. alpha-D-Glucopyranosyl fluoride (but not bet...

The effects of the Dietary Approaches to Stop Hypertension (DASH) eating plan on childhood metabolic syndrome (MetS) and insulin resistance remain to be determined. The present study aimed to assess the effects of recommendations to follow the DASH diet v. usual dietary advice (UDA) on the MetS and its features in adolescents. In this randomised cross-over clinical trial, sixty post-pubescent a...

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...

Mixed cultures of Cellulomonas gelida plus Azospirillum lipoferum or Azospirillum brasilense and C. gelida plus Bacillus macerans were shown to degrade cellulose and straw and to utilize the energy-yielding products to fix atmospheric nitrogen. This cooperative process was followed over 30 days in sand-based cultures in which the breakdown of 20% of the cellulose and 28 to 30% of the straw resu...

We address experimentally the radiation patterns of quantum dots coupled to optical nanoantennas at specific positions. We show that the emission of the coupled system is determined by a variety of resonant and non-resonant antenna modes both in polarization and angular pattern. The first working optical Yagi-Uda antenna is presented and unidirectional emission is demonstrated for a limited spe...

User development of computer-based applications (UDA) is a new phenomenon in organizations, and can provide benefits for both users and for data processing departments. The benefits of UDA to DP departments are consi.dered in this paper. The UDA literature suggests that the DP departments can expect to receive two major types of benefits: the backlog of DP appl ication devel opment projects sho...