O uso de inovações na transição de sistemas tradicionais de produção do semi-árido do Nordeste: alguns dilemas.

Resumo: No Nordeste brasileiro, proliferam propostas de transferência de tecnologias pautadas no desenvolvimento rural sustentável, justificadas no agravamento da questão ambiental e nas ameaças de desertificação de espaços rurais, associando tais fenômenos às práticas adotadas pelos sistemas tradicionais da agricultura familiar, a chamada agricultura itinerante, caracterizada pelo cultivo de uma área por um ou dois anos, seguido por vários anos de pousio. A reconversão de sistemas tradicionais da caatinga por meio da implantação de sistemas agrossilvipastoris, referenciados na agroecologia, tem sido uma opção apregoada por organismos de fomento ao desenvolvimento rural. Inserido nesta temática, o presente estudo narra algumas dificuldades de implantação de um projeto de validação de sistemas agrossilvipastoris em assentamentos do Ceará. The use of innovations in the transition of traditional productions systems in the Brazillian Northeast 'semi-arido': some dilemmas. Abstract: In the Brazillian Northeast, proposals for technological transfers guided by the principles of sustainable rural development abound. The justification offered for such proposals is the aggravation of environmental problems, and the threat of increased desertification in rural spaces, associated with the practices adopted by traditional systems of family agriculture, the so called itinerant agriculture, characterized by the growth of a crop in one area for two years followed by several years of rest. The return to tradicional systems of the 'caatinga' through the introduction of agroforestry systems, having as reference the agroecology, has been pointed out as an option by rural development foment organizations. Along these lines, the current work describes some of the difficulties faced when implementing a validation project for agroforestry systems in settlements in CearáEdição dos Resumos do Congresso Brasileiro de Agroecologia, 5., Guarapari, ES de 01 a 04 de outubro de 2007

Seismic behaviour analysis and retrofitting of a row building

Rammed earth is one of the oldest building materials in the world and is present in Portugal with a particular focus in the South of the country. The mechanical properties and the structural behavior of rammed earth constructions have been the subject of study of many researchers in the recent years. This study is part of a broader research on vernacular seismic culture in Portugal. Numerical analyzes were carried out to assess the influence of different retrofitting solutions in the behavior and seismic performance of an rammed earth building representative of the vernacular heritage of Alentejo region. Understating the structural fragilities of this type of constructions allowed determining the most appropriate retrofitting solutions.Project ‘SEISMIC-V –Vernacular Seismic Culture in Portugal’ (PTDC/ATP-AQI/3934/2012), from the Portuguese Science and Technology Foundation (FCT

Substrato artesanal para produção de mudas de maxixe por olericultores familiares no Estado do Amazonas.

Objetivou-se estudar diferentes substratos para a produção de mudas do maxixe, utilizando materiais existentes nas propriedades de olericultores familiares, ou de fácil obtenção nas circunvizinhanças.Edição dos Resumos do 52º Congresso Brasileiro de Olericultura, Salvador, jul. 2012

Melhoramento genético participativo: uma nova perspectiva para o manejo da diversidade genética do semi-árido nordestino.

bitstream/item/52153/1/Midia-Melhoramento-genetico.pd

Imperfect Detectors in Linear Optical Quantum Computers

We discuss the effects of imperfect photon detectors suffering from loss and noise on the reliability of linear optical quantum computers. We show that for a given detector efficiency, there is a maximum achievable success probability, and that increasing the number of ancillary photons and detectors used for one controlled sign flip gate beyond a critical point will decrease the probability that the computer will function correctly. We have also performed simulations of some small logic gates and estimate the efficiency and noise levels required for the linear optical quantum computer to function properly.Comment: 13 pages, 5 figure

Antibiofilm effect of some main components of essentials oils on E. coli biofilm

Fundação para a Ciência e Tecnologia (FCT)European Community - fund FEDER, through Program COMPETE, Project PTDC/SAUESA/6460912006 /FCOMP-01-0124-FEDER-00748