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Discuss?o sobre os critérios de avalia??o econ?mica: valor presente líquido (VPL), valor anual equivalente (VAE) e valor esperado da terra
Silva, Márcio Lopes da;Fontes, Alessandro Albino;
Revista árvore , 2005, DOI: 10.1590/S0100-67622005000600012
Abstract: frequently, it has occurred doubts and confusion in the interpretation of criteria of economic evaluation in the forestry sector. the objective of this was to clarify and argue the main issues related to the net present value, equivalent annual value and soil expected value, as well as to compare them and demonstrate that there is a relation among them. therefore, a study of case of a project of investment in eucalyptus reforestation was used in order to compare the criteria. the results indicated that all the criteria were adjusted and could be applied, being enough to know well the difference among them and the correct form of their interpretation.
Integra??o espacial no mercado mineiro de carv?o vegetal
Fontes, Alessandro Albino;Silva, Márcio Lopes da;Lima, Jo?o Eustáquio de;
Revista árvore , 2005, DOI: 10.1590/S0100-67622005000600013
Abstract: this study examined the spatial price integration among four regional markets of wood charcoal in minas gerais, brasil. after performing unit root tests, granger causality tests and estimating a var, it was concluded that the markets are integrated, in other words, a supply or a demand shock in one of those markets affects the prices of the wood charcoal in other markets. although the price of the wood charcoal has been analyzed in only four areas of the state, this study suggests that the wood charcoal market in minas gerais is working efficiently.
Análise da atividade florestal no município de Vi?osa-MG
Fontes, Alessandro Albino;Silva, Márcio Lopes da;Valverde, Sebasti?o Renato;Souza, Agostinho Lopes de;
Revista árvore , 2003, DOI: 10.1590/S0100-67622003000400012
Abstract: forest activity was studied in vi?osa-mg, through a questionnaire applied to farmers who planted forests. a total of 63 farms were sampled, comprising an area of 2,096.95 ha. the natural and planted forest areas sampled were of 372.00 ha and 260.17 ha, corresponding to 17.74% and 12.41%, respectively. the predominant natural forest was the secondary forest (capoeira) (67.55%), and the species chosen for reforestation was eucalypt (92.68%). average labor use in the phases of implementation, maintenance and harvest of the forest plantations was estimated at 30.21, 13.64 and 61.25 days-man/hectare, respectively, totalling 105.10 days-man/hectare, with family labor participation of 25.24%. forest activity costs (r$/ha) were estimated at r$419.30 for implementation; r$146.49 and r$80.34 for first and second year maintenance, respectively, and r$2.11/m3 for wood harvesting cost. the forest plantations are concentrated at the hillside areas and the average number of jobs generated by reforestation (eucalypt) was 0.042 jobs/hectare. it was concluded that, overall, reforestation was considered a rather unattractive activity, with typical forest properties remaining unidentified. thus, it is recommended the elaboration of public policies to encourage reforestation.
Aplica??o da programa??o dinamica na substitui??o de equipamentos
Marques, Gláucio Marcelino;Silva, Márcio Lopes da;Leite, Hélio Garcia;Fontes, Alessandro Albino;
Revista árvore , 2005, DOI: 10.1590/S0100-67622005000500010
Abstract: the objective of this work was to develop a dynamic programming model to determine the optimal time to replace equipment, including the incomes generated by the use and removal of the machine, aiming at the maximization of profits through a recurrence relation related to the incomes and costs along the years. thus, the proposed model was compared to the traditional replacement model using the dynamic programming that does not include the income generated by the equipment, used by filgueiras (1997). the model proposed was satisfactory according to the objective of the work, as its development made it possible to offer optimal decisions to replace or maintain the equipment. the model that includes only the costs showed to be best recommended in situations where the equipment is used without concern of generating annual incomes. on the other hand, the model developed can be used in situations where the equipment generates direct incomes or not. the model developed with the income showed to be efficient, and a greater susceptibility to a raise in the purchase value of the equipment was observed, whereas the model without concern to income is more susceptible to variations of interest rates. the advantage in using the dynamic programming (pd) in this case is that this tool offers a much greater range of alternatives at the moment of the decision making.
Análise da atividade florestal no município de Vi osa-MG
Fontes Alessandro Albino,Silva Márcio Lopes da,Valverde Sebasti?o Renato,Souza Agostinho Lopes de
Revista árvore , 2003,
Abstract: Estudou-se a atividade florestal no município de Vi osa-MG, a partir de questionário aplicado aos agricultores cujas propriedades rurais possuíam florestas plantadas. Foi amostrado um total de 63 propriedades rurais, abrangendo uma área de 2.096,95 ha. As áreas de floresta nativa e plantada, na amostra, foram de 372,00 e 260,17 ha, o que corresponde, respectivamente, a 17,74 e 12,41% da área amostrada. O tipo de floresta nativa predominante foi a capoeira (67,55%), e a espécie preferida para o reflorestamento foi o eucalipto (92,68%). O uso médio da m o-de-obra nas fases de implanta o, manuten o e colheita dos plantios florestais foi estimado em 30,21, 13,64 e 61,25 dias-homem/ha, respectivamente, totalizando 105,10 dias-homem/ha, sendo a participa o da m o-de-obra familiar de 25,24%. Os custos inerentes à atividade florestal foram estimados em R$419,30/ha para implanta o; R$146,49/ha e R$80,34/ha para manuten o no primeiro e segundo ano, respectivamente; e R$2,11/m3 para colheita da madeira. Os plantios florestais concentram-se nas áreas de encostas, e o número médio de empregos gerados pelo reflorestamento (eucalipto) foi 0,042 emprego/ha. Concluiu-se, de modo geral, que o reflorestamento é considerado atividade pouco atrativa, n o identificando propriedades tipicamente florestais, sendo recomendada a elabora o de políticas públicas de incentivo ao reflorestamento.
Improving Protein Crystal Quality by the Without-Oil Microbatch Method: Crystallization and Preliminary X-ray Diffraction Analysis of Glutathione Synthetase from Pseudoalteromonas haloplanktis
Antonello Merlino,Irene Russo Krauss,Antonella Albino,Andrea Pica,Alessandro Vergara,Mariorosario Masullo,Emmanuele De Vendittis,Filomena Sica
International Journal of Molecular Sciences , 2011, DOI: 10.3390/ijms12096312
Abstract: Glutathione synthetases catalyze the ATP-dependent synthesis of glutathione from L-γ-glutamyl-L-cysteine and glycine. Although these enzymes have been sequenced and characterized from a variety of biological sources, their exact catalytic mechanism is not fully understood and nothing is known about their adaptation at extremophilic environments. Glutathione synthetase from the Antarctic eubacterium Pseudoalteromonas haloplanktis ( PhGshB) has been expressed, purified and successfully crystallized. An overall improvement of the crystal quality has been obtained by adapting the crystal growth conditions found with vapor diffusion experiments to the without-oil microbatch method. The best crystals of PhGshB diffract to 2.34 ? resolution and belong to space group P2 12 12 1 , with unit-cell parameters a = 83.28 ?, b = 119.88 ?, c = 159.82 ?. Refinement of the model, obtained using phases derived from the structure of the same enzyme from Escherichia coli by molecular replacement, is in progress. The structural determination will provide the first structural characterization of a psychrophilic glutathione synthetase reported to date.
Perturbative description of inclusive single hadron production at HERA
Albino, Simon
High Energy Physics - Phenomenology , 2008,
Abstract: Light charged hadron production data in the current fragmentation region at HERA are calculated using next-to-leading order perturbative calculations and fragmentation functions obtained from similar data from e+ e- reactions. General good agreement is found at large photon virtuality Q^2 and intermediate momentum fraction x_p, consistent with fragmentation function universality. The description of the small x_p and Q^2 region is improved by incorporating hadron mass effects.
The hadronization of partons
Albino, Simon
High Energy Physics - Phenomenology , 2008, DOI: 10.1103/RevModPhys.82.2489
Abstract: We review the description of inclusive single unpolarized light hadron production using fragmentation functions in the framework of the factorization theorem. We summarize the factorization of quantities into perturbatively calculable quantities and these universal fragmentation functions, and then discuss some improvements beyond the standard fixed order approach. We discuss the extraction of fragmentation functions for light charged and neutral hadrons using these theoretical tools through global fits to experimental data from reactions at various colliders, in particular from accurate e+e- reactions at LEP, and the subsequent successful predictions of other experimental data, such as data gathered at HERA, the Tevatron and RHIC from these fitted fragmentation functions as allowed by factorization universality. These global fits also impose competitive constraints on alpha_s(M_Z). Emphasis is placed on the need for accurate data from ep and pp(pbar) reactions in which the hadron species is identified in order to constrain the separate fragmentation functions of each quark flavour and hadron species.
Un'estensione del metodo di continuità
Albino Canfora
Le Matematiche , 1996,
Abstract: See directly the article.
Policy Research in a Complex Context  [PDF]
Alessandro Colombo
Intelligent Information Management (IIM) , 2010, DOI: 10.4236/iim.2010.211071
Abstract: Today’s world is characterized by uncertainty and complexity. While examining the importance of research in such a context, the paper attempts to outline a first definition of the role and potential of policy research. The policy process itself has become increasingly complex and non linear, as has its relationship with research. Consequently, policy researchers’ contributions to policymakers may not have a direct, punctual and immediate influence on single issues, but rather a more pervasive, interactive, deliberative effect. Focusing on the theoretical definition of the risk, uncertainty and complexity of the policy process today, the paper outlines some questions and puts forward possible answers which offer a starting point for further analysis. It explores a new role for policy research and underlines the opportunities offered by argumentative, deliberative and multidisciplinary approaches which can positively impact democracy.
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