VIBRATION TRANSMISSIBILITY OF THE COFFEE FRUIT-PEDUNCLE SYSTEM: A FORCED VIBRATION STUDY OF HIGH FREQUENCY AIMING MECHANICAL HARVESTING

ABSTRACT Semi-mechanized and mechanized harvesting use machines that promote the transference of vibrational energy and impact to achieve the detachment of coffee fruits. The aim of this study was to evaluate the vibration transmissibility in coffee fruit-peduncle systems, using high-speed cameras, submitted to high frequency harmonic excitation in different combinations between frequency and amplitude of vibration, identifying working ranges suitable to perform selective harvesting. Vibration transmissibility was determined for the coffee fruit-peduncle systems, for the maturation stages unripe and ripe that were subjected to a sinusoidal harmonic displacement, in which the input parameters were frequency (35, 45 and 55 Hz) and peak-to-peak amplitude (3.5, 5.0 and 6.5 mm). An experiment was used to study the effect of frequency and amplitude on vibration transmissibility in a completely randomized design in a factorial scheme 3 x 3 x 2, with three replications. The frequency of 35 Hz, associated with the amplitudes 3.5-6.5 mm, was the one that most influenced the results of vibration transmissibility. For the frequency of 55 Hz and amplitude of 6.5 mm, in the ripe maturation stage, the vibration transmissibility was higher than 1.0, which could be a suitable combination for selective coffee harvesting

Book of abstracts, 4th World Congress on Agroforestry

International audienc

Agroforestry and Sustainable Agricultural Production

This book focuses on the potential of agroforestry to maximize agriculture production while minimizing negative effects on the environment. It collects several studies on agroforestry systems from around the world, including a variety of types of agroforestry systems, from traditional wood-pastures to tropical cocoa-based systems, and research approaches, from literature reviews to state-of-the-art ecological-economic models. The book highlights the potential of agroforestry as a promising approach for the creation of multifunctional landscapes able to face contemporary environmental challenges

NORTH AMERICAN AGRICULTURAL MARKET INTEGRATION AND ITS IMPACT ON THE FOOD AND FIBER SYSTEM

Economic change and market dynamics have fundamentally altered the structure and performance of agricultural markets in the United States, Canada, and Mexico within the last 25 years. Many factors have helped shape the current North American food and fiber system, including technological change, domestic farm policies, international trade agreements, and the economic forces of supply and demand. Ratification of NAFTA, for example, helped integrate the North American market, sparking a surge in trade and investment among the United States, Canada, and Mexico. In recent years, efforts to further integrate the continental market seem to have slowed. Broadening the scope of NAFTA to include institutional reforms that lead to a more unified system of commercial law, the establishment of common antitrust and regulatory procedures, harmonization of product standards, and increased coordination of domestic farm, market, and macroeconomic policies would deepen market integration and enhance market efficiency and growth within North America.agriculture, market integration, market segmentation, law of one price, price transmission, elasticities, exchange-rate pass-through, market efficiency, bilateral trade intensity, regional trade agreements, NAFTA, CUSTA, trade policy, WTO, GATT, Industrial Organization, International Relations/Trade, Marketing,

Community Making: An Expansive View of Curriculum

Making as a term has gained attention in the educational field. It signals many different meanings to many different groups, yet is not clearly defined. This project’s researchers refer to making as a term that bears social and cultural impact but with a broader more sociocultural association than definitions that center making in STEM learning. Using the theoretical lenses of critical relationality and embodiment, our research team position curriculum as a set of locally situated activities that are culturally, linguistically, socially, and politically influenced. We argue that curriculum emerges from embodied making experiences in specific interactions with learners and their communities. This study examines multiple ways of learning within and across seven community-based organizations who are engaged directly or indirectly in making activities that embedded literacy, STEM, peace, and the arts. Using online ethnography, the research team adopted a multiple realities perspective that positions curriculum as dynamic, flexible, and evolving based on the needs of a community, its ecosystems, and the wider environment. The research team explored  making and curricula through a qualitative analysis of interviews with community organizers and learners. The findings provide thick descriptions of making activities which reconceptualize making and curriculum as living and responsive to community needs. Implications of this study expand and problematize the field’s understanding of making, curriculum, and learning environments