Efeito de coberturas vegetais sobre a porosidade, densidade do solo e condutividade hidráulica saturada de um Argissolo Amarelo Distrocoeso cultivado com mamoeiro.

O tráfego de veículos pesados modifica a estrutura do solo, causando o rompimento de suas resistências naturais ? que se encontram interligadas por forças de atração e repulsão alterando o fluxo de água no solo, reduzindo a produtividade e aumentando os níveis de erosão, já que, geralmente, reduz a taxa de infiltração e aumenta o escoamento superficial (Seixas, 2000); isso ocorre porque a velocidade de infiltração e de redistribuição da água no perfil do solo depende do tamanho dos poros O comportamento do solo em decorrência do tráfego de máquinas vem sendo estudado com freqüência no setor agrícola e os resultados têm evidenciado alterações negativas em suas propriedades físicas. Porém, são poucas as pesquisas relacionadas ao cultivo do mamoeiro que, como se sabe, o uso de máquinas para sua produção é intensivo. Assim, o presente trabalho teve o objetivo de levantar informações sobre o efeito do uso de máquinas e de cobertura vegetal em alguns atributos físicos de um Argissolo Amarelo distrocoeso cultivado com mamoeiro.pdf 154

Long-term visual and microperimetry outcomes following autologous retinal pigment epithelium choroid graft for neovascular age-related macular degeneration

To describe the 2- to 4-year visual and microperimetry outcomes of autologous retinal pigment epithelium (RPE)-choroid graft in patients with neovascular age-related macular degeneration (AMD).In this retrospective cohort study, 12 patients with subfoveal neovascular AMD who had undergone autologous RPE-choroid graft between August 2004 and June 2005 were reviewed. Change in visual acuity (VA), contrast sensitivity (CS), fixation stability and retinal sensitivity on microperimetry after 2-3 years and the rates of late postoperative complications were examined.Patients were followed for 26-48 months (mean, 39). Median preoperative VA (logMAR) was 0.87 but declined to 1.43 (1 year), 1.46 (2 years) and 1.38 (3 years), P = 0.001. Median CS (logCS) was 0.75 preoperatively but declined to 0.45 at 2 years. Six patients had serial microperimetry. Fixation stability declined in 1 but improved in 2 patients. All 6 had decline in retinal sensitivity over the graft during follow up. Retinal detachment did not occur after 12 months but 8 developed epiretinal membrane, 12 had cystic retinal change over the graft and 4 developed recurrent choroidal neovascularization. However, 10 grafts retained autofluorescence signal at 18-48 months of follow up.Autologous RPE-choroid graft can maintain VA, stable fixation and retinal sensitivity in some patients for over 3 years. The spatial correlation between graft autofluorescence, outer retinal structures on optical coherence tomography and retinal sensitivity are consistent with photoreceptor cell rescue. However, we caution the use of this technique as there is high complication rate and delayed loss of retinal function

Variedades de soja anual (Glycine max) para produção de massa e efeitos de métodos de fenação sobre consumo.

Avaliação das variedades de soja anual para produção de matéria seca, capacidade de rebrota após o corte e adequação desta cultura para fenação

Effective Semantic Segmentation in Cataract Surgery: What Matters Most?

Our work proposes neural network design choices that set the state-of-the-art on a challenging public benchmark on cataract surgery, CaDIS. Our methodology achieves strong performance across three semantic segmentation tasks with increasingly granular surgical tool class sets by effectively handling class imbalance, an inherent challenge in any surgical video. We consider and evaluate two conceptually simple data oversampling methods as well as different loss functions. We show significant performance gains across network architectures and tasks especially on the rarest tool classes, thereby presenting an approach for achieving high performance when imbalanced granular datasets are considered. Our code and trained models are available at https://github.com/RViMLab/MICCAI2021_Cataract_semantic_segmentation and qualitative results on unseen surgical video can be found at https://youtu.be/twVIPUj1WZM

A Non-Axisymmetric Parallel Manipulator for Head Stabilisation in Vitreoretinal Surgery

A non-axisymmetric parallel manipulator headrest design was previously proposed to counter patient head motion during ophthalmic surgery, and a non-motorized prototype was built. Custom linear actuators were designed, and installed to the headrest manipulator prototype in preparation for kinematic performance test. An inverse kinematic-based control algorithm was implemented, and initial kinematic testing was done. Finally, the future plans for the research are briefly explaine

The dynamics of financial stability in complex networks

We address the problem of banking system resilience by applying off-equilibrium statistical physics to a system of particles, representing the economic agents, modelled according to the theoretical foundation of the current banking regulation, the so called Merton-Vasicek model. Economic agents are attracted to each other to exchange `economic energy', forming a network of trades. When the capital level of one economic agent drops below a minimum, the economic agent becomes insolvent. The insolvency of one single economic agent affects the economic energy of all its neighbours which thus become susceptible to insolvency, being able to trigger a chain of insolvencies (avalanche). We show that the distribution of avalanche sizes follows a power-law whose exponent depends on the minimum capital level. Furthermore, we present evidence that under an increase in the minimum capital level, large crashes will be avoided only if one assumes that agents will accept a drop in business levels, while keeping their trading attitudes and policies unchanged. The alternative assumption, that agents will try to restore their business levels, may lead to the unexpected consequence that large crises occur with higher probability

Hydrodynamic model intercomparison for the patos lagoon (Brazil)

An intercomparison study is carried out between two models with different formulations and spatial discretizations in order to overcome the limitations posed by the standard calibration and validation procedures and improve confidence in the hydrodynamic results for the Patos Lagoon. Numerical simulations were carried out applying the TELEMAC and MOHID models, based on the same boundary conditions and identical calibration coefficients so differences in calculated flow conditions result from the formulations and parameterizations of each model. Results from both models are compared with measurements from three stations inside the lagoon. Preliminary results indicate that both models compare well with the measurements and with each other. These results increase the confidence on hydrodynamic results for the Patos Lagoon and provide the first step towards water quality studies for the area