SEMENTEIRO: Multiplicação de batatasemente para uso próprio.

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Plataforma de telhas de fibrocimento: estrutura hidropônica para a produção de batata-semente pré-básica.

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Solid state conversion of olanzapine during tableting

Abstract of poster presented at the 12th PBP World Meeting on Pharmaceutics, Biopharmaceutics and Pharmaceutical Technology, Wien, Austria, 11-14 May 2021 (virtual Meeting)N/

Dynamic critical behavior of failure and plastic deformation in the random fiber bundle model

The random fiber bundle (RFB) model, with the strength of the fibers distributed uniformly within a finite interval, is studied under the assumption of global load sharing among all unbroken fibers of the bundle. At any fixed value of the applied stress (load per fiber initially present in the bundle), the fraction of fibers that remain unbroken at successive time steps is shown to follow simple recurrence relations. The model is found to have stable fixed point for applied stress in the range 0 and 1; beyond which total failure of the bundle takes place discontinuously. The dynamic critical behavior near this failure point has been studied for this model analysing the recurrence relations. We also investigated the finite size scaling behavior. At the critical point one finds strict power law decay (with time t) of the fraction of unbroken fibers. The avalanche size distribution for this mean-field dynamics of failure has been studied. The elastic response of the RFB model has also been studied analytically for a specific probability distribution of fiber strengths, where the bundle shows plastic behavior before complete failure, following an initial linear response.Comment: 13 pages, 5 figures, extensively revised and accepted for publication in Phys. Rev.

Batata 'cristal'.

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Multiplicação de tubérculos -semente na propriedade: : uma opção para os pequenos produtores

The present research aimed to evaluate the multiplication of seed potatoes from basic seeds at grower farm to increase yield in commercial potato crops. The potato cultivars Epagri 361-Catucha, Baronesa, Elvira, Monalisa and Macaca were cultivated in participatory research, during the growing seasons of 1999, 2000 and 2001 in southerncoast of Santa Catarina State, Brazil. It was evaluated the occurrence of viral diseases, multiplication tuber index, yield and size of seed potatoes. It was also evaluated the quality and yield of the tubers for fresh consumption. The results showed the viability of multiplication of seed potatoes by growers to use them in commercial crops. It is possible to increase the average productivity of the commercial potato crops in the region using this simple technique.The incidence of viral diseases was different among cultivars particularly for the Y virus.Com o objetivo de verificar a viabilidade técnica da multiplicação própria de tubérculos-semente de diversas cultivares, a partir de batata-semente básica, conduziram-se nove unidades de observação na região doLitoral Sul Catarinense, nos plantios de inverno de 1999 e 2000. No plantio de outono de 2001, conduziram-se mais quatro unidades de observação com o objetivo de avaliar a produção de batata-consumo das cultivares Epagri 361-Catucha, Baronesa, Elvira, Monalisa e Macaca, utilizando-se "semente" multiplicada no plantio anterior. Avaliaram-se a ocorrência de viroses, a taxa de multiplicação, o rendimento total e os tipos de tubérculos-semente produzidos em propriedades de agricultores. Na produção de batata-consumo, avaliaram-se os rendimentos total e comercial de tubérculos. Pelos resultados obtidos, constatou-se que é viável a multiplicação de tubérculos-semente, visando aprodução de batata-consumo, no plantio seguinte. Com o uso de "semente" produzida a partir de batata-semente básica, associado à cultivar adaptada, é possível elevar o rendimento médio das cultivares quanto à suscetibilidade aovírus Y e do enrolamento. O vírus Y é, atualmente, a maior causa da degenerescência da batata-semente na região do Litoral Sul Catarinense

Precursors of catastrophe in the BTW, Manna and random fiber bundle models of failure

We have studied precursors of the global failure in some self-organised critical models of sand-pile (in BTW and Manna models) and in the random fiber bundle model (RFB). In both BTW and Manna model, as one adds a small but fixed number of sand grains (heights) to any central site of the stable pile, the local dynamics starts and continues for an average relaxation time (\tau) and an average number of topplings (\Delta) spread over a radial distance (\xi). We find that these quantities all depend on the average height (h_{av}) of the pile and they all diverge as (h_{av}) approaches the critical height (h_{c}) from below: (\Delta) (\sim (h_{c}-h_{av}))(^{-\delta}), (\tau \sim (h_{c}-h_{av})^{-\gamma}) and (\xi) (\sim) ((h_{c}-h_{av})^{-\nu}). Numerically we find (\delta \simeq 2.0), (\gamma \simeq 1.2) and (\nu \simeq 1.0) for both BTW and Manna model in two dimensions. In the strained RFB model we find that the breakdown susceptibility (\chi) (giving the differential increment of the number of broken fibers due to increase in external load) and the relaxation time (\tau), both diverge as the applied load or stress (\sigma) approaches the network failure threshold (\sigma_{c}) from below: (\chi) (\sim) ((\sigma_{c}) (-)(\sigma)^{-1/2}) and (\tau) (\sim) ((\sigma_{c}) (-)(\sigma)^{-1/2}). These self-organised dynamical models of failure therefore show some definite precursors with robust power laws long before the failure point. Such well-characterised precursors should help predicting the global failure point of the systems in advance.Comment: 13 pages, 9 figures (eps

Failure due to fatigue in fiber bundles and solids

We consider first a homogeneous fiber bundle model where all the fibers have got the same stress threshold beyond which all fail simultaneously in absence of noise. At finite noise, the bundle acquires a fatigue behavior due to the noise-induced failure probability at any stress. We solve this dynamics of failure analytically and show that the average failure time of the bundle decreases exponentially as the stress increases. We also determine the avalanche size distribution during such failure and find a power law decay. We compare this fatigue behavior with that obtained phenomenologically for the nucleation of Griffith cracks. Next we study numerically the fatigue behavior of random fiber bundles having simple distributions of individual fiber strengths, at stress less than the bundle's strength (beyond which it fails instantly). The average failure time is again seen to decrease exponentially as the stress increases and the avalanche size distribution shows similar power law decay. These results are also in broad agreement with experimental observations on fatigue in solids. We believe, these observations regarding the failure time are useful for quantum breakdown phenomena in disordered systems.Comment: 13 pages, 4 figures, figures added and the text is revise

Produção de batata no Rio Grande do Sul.

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Failure regime in (1+1) dimensions in fibrous materials

In this paper, we introduce a model for fracture in fibrous materials that takes into account the rupture height of the fibers, in contrast with previous models. Thus, we obtain the profile of the fracture and calculate its roughness, defined as the variance around the mean height. We investigate the relationship between the fracture roughness and the fracture toughness.Comment: 4 pages, 4 figures.eps, Revte