Visual feedback in a brain computer interface (BCI) influences significantly in its performance; but when this BCI will be applied in a rehabilitation therapy for post stroke patients, it will be a determining factor to enhance the neuroplasticity process. Many studies have demonstrated the efficiency of virtual reality (VR) in a BCI, motor cortex increases its activation levels due to be an immersive environment for the subject; specifically, a BCI based on motor imagery (MI) with VR feedback has positive effects in patients. This work proposes to apply a BCI with VR to support an upper limb rehabilitation therapy for post stroke patients, but it has been tested with eighteen healthy subjects, they performed MI tasks of flexion and extension of their arms, then they could see a virtual arm in 3D performing the same requested movement. Comparison of power spectral density (PSD) estimatio...

This work presents a brain computer interface (BCI) framework for upper limb rehabilitation of post stroke patients, combining BCI and virtual reality (VR) technology; a VR feedback is shown to the participants to achieve a greater activation of certain brain regions involved with the performing of upper limb motor task. This system uses an adaptive neuro-fuzzy inference system (ANFIS) classifier to discriminate between a motor task and rest condition, the first one classifies between extension and rest conditions; and the second one classifies between flexion and rest conditions. In the training stage, eight healthy subjects participated in the sessions, the best accuracies are 99.3% and 88.9%, as a result of cross-validation. Meanwhile, the best accuracy in online test is 89%. The methodology here presented can be straightforwardly employed as a rehabilitation system for brain repair i...

In this research, the whey potential for optimization of biogas production by anaerobic co – digestion with cow dung was studied. It used a two-component multifactorial – design, where it was studied four batch type - biodigesters of 4 liters on a laboratory scale with different whey concentrations (0%, 10%, 30%, 50%) and dilute cow dung in relation 1:1.5, each one in three replications. The experimentation was performed under temperature control of 35°C±2°C; and pH control between 6.4 to 6.9 by the addition of NaOH 3N; with an average of 7% of total solids and a holding time of 35 days. Below these conditions, the 2nd biodigester with 10% of whey, it was the one which generate the largest amount of biogas with 37.9 liters in total; the 3rd biodigester, with 30% of whey generates 24.2 liters of biogas; and the 4th biodigester, with 50% of whey generates 14.5 liters. The reduction ...

As previous studies have reported that long-term exposure tu pesticides anticholinesterases (organophosphates and carbamates) at repeated dose produces neurotoxicity, it has determinated the plasma cholinesterase activity and the symptomatology in 83 pesticides applicators from valley of Mala-Perú with the purpose to knowing the exposure levels and to have an indication oí the health effects in the applieators. The control group consisted of 28 subjects who were matched with the sociodemographics characteristics of the applicators but whose economical activíty was difierent to agriculture. It was found that the studied applicators did not fulfill the protection rules during the manage of pesticides. The mean of plasma cholinesterase activity in 4 from 5 formed groups by the proccedence place of applícators were significatively lower than the mean of the control group. The 5 symptoms ...

As previous studies have reported that long-term exposure tu pesticides anticholinesterases (organophosphates and carbamates) at repeated dose produces neurotoxicity, it has determinated the plasma cholinesterase activity and the symptomatology in 83 pesticides applicators from valley of Mala-Perú with the purpose to knowing the exposure levels and to have an indication oí the health effects in the applieators. The control group consisted of 28 subjects who were matched with the sociodemographics characteristics of the applicators but whose economical activíty was difierent to agriculture. It was found that the studied applicators did not fulfill the protection rules during the manage of pesticides. The mean of plasma cholinesterase activity in 4 from 5 formed groups by the proccedence place of applícators were significatively lower than the mean of the control group. The 5 symptoms ...