The proliferation of new devices to detect human movements has produced an increase in the use of interfaces based on touchless hand gestures. These kind of applications may also be used in classrooms. Although a lot of studies have been carried out, most of them are not focused on classrooms. Therefore, this paper presents a bibliographic review about related studies with the aim of organizing and relating them to the interface design for this type of scenario. This review discusses some related applications, how gestures performed by users are recognized, design aspects to consider, and some evaluation methods for this interaction style. Thus, this work may be a reference guide to both researchers and software designers to develop and use such applications in classrooms.

Enterprise Architecture (EA) is conceived nowadays as an essential management activity to visualize and evaluate the future direction of a company. The objective of this paper is to make a literature review on EA to evaluate its role as management tool. It is also explained how EA can fulfill two fundamental purposes, first as a tool for assessing the current situation (self-assessment) of an organization; second as a tool to model and simulate future scenarios that allow better decision making for the restructuration and development of improvement plans. Furthermore an analysis is made of the integration possibilities of EA with other business management methodologies, as balanced score card (BSC) and the model of the European Foundation for Quality Management (EFQM). As the result a management framework is presented, which includes the required elements to achieve excellence and quality standards in organizations.

The scientific interest in climate change allowed to uncover evidence demonstrating a general warming trend caused by human activities. Facts such as rising sea levels, extreme weather events and retreat of glaciers, are indicators of the presence of alterations of normal weather patterns. In Ecuador, the Antisana is a stratovolcano of strategic importance affecting the climate of the region, in the functioning of the surrounding ecosystems. It is also a reserve of water for the population of the Metropolitan District of Quito (DMQ). The glaciers of the tropical volcano are also suffering the effects of global warming. Its decline over time is of concern and should be analyzed. The present research work performed a spatial and temporal study based on historical series of aerial photographs taken between 1956 and 2011, through geo-processing capabilities of geographic information systems (GIS). The results show a significant decrease in the glaciers of the Antisana Volcano and significant changes in the surrounding local ecological formations.

The aim of this study was to obtain a flavored green tea with organic rose petals "Vitality" from Nevado Ecuador. Green tea, purchased from a private company, it was subjected to analysis to verify compliance with the requirements of standard INEN 2381: 2005. The Characterization of fresh rose petals was to made and for the dehydration was used two temperatures and two geometries. Analysis of total polyphenol content (Folin-Ciocalteu) and antioxidant capacity (TEACmethod) were performed. The dried petals, with a higher content of polyphenols and antioxidant capacity, were used in the preparation to flavored tea. Three formulations with different amounts of dried rose petals (10, 17.5 and 25%) were tested sensorially by 100 judges to determine the aroma rose in the tea. The final product was analyzed to determine compliance of the requirements of the standard INEN of the tea. Finally acceptability and purchase intention of the product is evaluated. The values of content total polyphenol in the extracts of rose petals were superior to fruits such as blackberries, and strawberries.

In this paper the presence of electric charge in two insulation of cross-linked polyethylene (XLPE) in medium voltage cables was compared using the technique of Thermally Stimulated Depolarization Currents (TSDC). Antioxidant in solid form was added to one of the insulation, and in liquid form to the other. By analyzing the TSDC measures we verified that the use of liquid antioxidant is better because the solid antioxidant creates defects that act as centers for trapping the space charge. In these centers the ionized charge, by the combined effect of temperature and electric field, is accumulated in the insulation, in addition to the charge injected from the semiconductor electrodes by the effect of high fields.

This work evaluated the business risk change of 20 companies included on the sustainable index of the Mexican Stock Exchange (BMV). The unlevered beta coefficient was used for this analysis. Two periods were compared: the one before, and the one after including the companies on the index. For each of the 20 companies it was used financial information, stocks closing prices and the stock market index value, over a period of 234 weeks. Then, considering the two periods, the statistical difference between the unlevered beta coefficient averages was calculated. Finally, a hypothesis proof was made to evaluate the business risk change. It was found that for 12 out of the 20 companies, the unlevered beta coefficient suffered a reduction. The findings suggest that it is not enough for the companies to certify as sustainable in order to reduce its business risk.