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Article ; Online: Migraine aura discrimination using machine learning: an fMRI study during ictal and interictal periods.

Fernandes, Orlando / Ramos, Lucas Rego / Acchar, Mariana Calixto / Sanchez, Tiago Arruda

Medical & biological engineering & computing

2024

Abstract: Functional magnetic resonance imaging (fMRI) studies on migraine with aura are challenging due to the rarity of patients with triggered cases. This study optimized methodologies to explore differences in ictal and interictal spatiotemporal activation ... ...

Abstract	Functional magnetic resonance imaging (fMRI) studies on migraine with aura are challenging due to the rarity of patients with triggered cases. This study optimized methodologies to explore differences in ictal and interictal spatiotemporal activation patterns based on visual stimuli using fMRI in two patients with unique aura triggers. Both patients underwent separate fMRI sessions during the ictal and interictal periods. The Gaussian Process Classifier (GPC) was used to differentiate these periods by employing a machine learning temporal embedding approach and spatiotemporal activation patterns based on visual stimuli. When restricted to visual and occipital regions, GPC had an improved performance, with accuracy rates for patients A and B of roughly 86-90% and 77-81%, respectively (p < 0.01). The algorithm effectively differentiated visual stimulation and rest periods and identified times when aura symptoms manifested, as evident from the varying predicted probabilities in the GPC models. These findings contribute to our understanding of the role of visual processing and brain activity patterns in migraine with aura and the significance of temporal embedding techniques in examining aura phenomena. This finding has implications for diagnostic tools and therapeutic techniques, especially for patients suffering from aura symptoms.
Language	English
Publishing date	2024-04-19
Publishing country	United States
Document type	Journal Article
ZDB-ID	282327-5
ISSN	1741-0444 ; 0025-696X ; 0140-0118
ISSN (online)	1741-0444
ISSN	0025-696X ; 0140-0118
DOI	10.1007/s11517-024-03080-5
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Article ; Online: Forms of land access in the sugarcane agroindustry

de Almeida Patrícia José / Salinas Carlos T. / Ramos Lucas / de Carvalho Celso Albano

Open Agriculture, Vol 7, Iss 1, Pp 765-

A comparison of Brazilian and Peruvian cases

2022 Volume 781

Abstract: Currently, many sugarcane mills face the challenge of obtaining sufficient raw material. This work analyzes and compares the land access forms to cane production in Brazil (big producer) and Peru (small producer). Data from Agricultural Censuses of the ... ...

Abstract	Currently, many sugarcane mills face the challenge of obtaining sufficient raw material. This work analyzes and compares the land access forms to cane production in Brazil (big producer) and Peru (small producer). Data from Agricultural Censuses of the two countries are used. In the analyzed period, there was an increase in sugarcane production in both countries. It is observed that in Brazil, the tendency is for sugar mills to use land leasing or sharecropping contracts. In Peru, new sugarcane mills mainly use their own land. The access to land through agrarian contracts can be a factor of sustainability of the sugarcane agribusiness.
Keywords	land access ; leasing ; sharecropping ; sugarcane agroindustry ; Agriculture ; S ; Agriculture (General) ; S1-972
Language	English
Publishing date	2022-10-01T00:00:00Z
Publisher	De Gruyter
Document type	Article ; Online
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Article ; Online: Online hemodiafiltration without calcium replacement using citrate as an anticoagulant and dialysis fluid with 3.5 mEq of post dilutional calcium in patients with heparin-induced thrombocytopenia: Report of 2 cases.

Ramos, Lucas / Luxardo, Rosario / Crucelegui, María Soledad / Satera, Nadia / Jordán Ordoñez, Yuliana / Rosa-Diez, Guillermo

Nefrologia

2024 Volume 44, Issue 2, Page(s) 299–301

MeSH term(s)	Humans ; Hemodiafiltration/methods ; Anticoagulants/adverse effects ; Thrombocytopenia/chemically induced ; Heparin/adverse effects ; Citric Acid/adverse effects ; Citric Acid/therapeutic use ; Male ; Female ; Calcium/blood ; Aged ; Middle Aged ; Dialysis Solutions/adverse effects
Chemical Substances	Anticoagulants ; Heparin (9005-49-6) ; Citric Acid (2968PHW8QP) ; Calcium (SY7Q814VUP) ; Dialysis Solutions
Language	English
Publishing date	2024-03-27
Publishing country	Spain
Document type	Case Reports ; Letter
ZDB-ID	2837917-2
ISSN	2013-2514 ; 2013-2514
ISSN (online)	2013-2514
ISSN	2013-2514
DOI	10.1016/j.nefroe.2024.03.001
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Article ; Online: Syndesmosis dislocation and ankle ligament stress in the posterior malleolus fracture fixated - "in vitro analysis".

Mansur, Henrique / Ramos, Lucas Sacramento / Lucas, Phelipe Pinheiro Alves / Battaglion, Leonardo Rigobello / Freitas, Anderson

Injury

2023 Volume 54 Suppl 6, Page(s) 110782

Abstract: Purpose: The objectives of this study were to compare syndesmosis dislocation and ankle ligament stress after the fixation of the posterior malleolus fracture (PMF) with four different techniques by Finite Element Analysis (FEM).: Methods: Four ... ...

Abstract	Purpose: The objectives of this study were to compare syndesmosis dislocation and ankle ligament stress after the fixation of the posterior malleolus fracture (PMF) with four different techniques by Finite Element Analysis (FEM). Methods: Four internal fixation techniques used for fixation of PMF were assessed by FEM: posterior one-third tubular 3.5 mm buttress plate (PP) with one screw (PP 1 screw), PP with two screws (PP 2 screws), two cannulated 3.5 mm lag screws in the anteroposterior (AP) direction (AP lag screws), and two posteroanterior (PA) cannulated 3.5 mm lag screws (PA lag screws). PMF with 30% fragment size was simulated through computational processing reconstructed from computed tomography (CT). The simulated loads of 700 N and 1200 N were applied to the proximal tibial end. The FEM evaluated the syndesmosis dislocation (mm) and stress values of the posterior tibiofibular ligament (PTFL) (in Kpa) and deltoid ligament (in Kpa) in the four mentioned subgroups. Results: We found that with a load of 700 N, syndesmosis dislocation varied from 6.5 to 7.9 mm, being the lowest and greatest for PA lag screw and PP 1 screw, respectively. In all groups was observed a greater dislocation in the syndesmosis at 1200 N of load. We observed that the stress values on the PTFL were lower for AP lag screws and PP 2 screws with 700 N and 1200 N, respectively. For both loads, PP 1 screw presented the greatest stress. Regarding the stress in the deltoid ligament, the AP lag screws presented the lowest stress for 700 N and PP 1 screw for 1200 N. For all fixation techniques, the syndesmosis displacement and ligament stresses were higher when 1200 N were imposed. Conclusion: This study demonstrated that PMF fixed with lag screws presents greater stability in the distal tibiofibular syndesmosis and higher joint loadings promoted greater displacement and ligaments stress, regardless of the fixation technique. Besides, lower stress in the syndesmosis is accompanied by a greater load on the deltoid ligament.
MeSH term(s)	Humans ; Ankle Fractures/diagnostic imaging ; Ankle Fractures/surgery ; Ankle Joint/diagnostic imaging ; Ankle Joint/surgery ; Ankle ; Ligaments, Articular/diagnostic imaging ; Ligaments, Articular/surgery ; Tibia ; Joint Dislocations/diagnostic imaging ; Joint Dislocations/surgery ; Fracture Fixation, Internal/methods
Language	English
Publishing date	2023-04-19
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	218778-4
ISSN	1879-0267 ; 0020-1383
ISSN (online)	1879-0267
ISSN	0020-1383
DOI	10.1016/j.injury.2023.05.013
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Zs.A 778: Show issues			Location: Je nach Verfügbarkeit (siehe Angabe bei Bestand) bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular Jg. 1995 - 2021: Lesesall (1.OG) ab Jg. 2022: Lesesaal (EG)
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Article: Assessment of Machine Learning Techniques for Oil Rig Classification in C-Band SAR Images

da Silva, Fabiano G. / Ramos, Lucas P. / Palm, Bruna G. / Machado, Renato

Remote Sensing. 2022 June 21, v. 14, no. 13

2022

Abstract: This article aims at performing maritime target classification in SAR images using machine learning (ML) and deep learning (DL) techniques. In particular, the targets of interest are oil platforms and ships located in the Campos Basin, Brazil. Two ... ...

Abstract	This article aims at performing maritime target classification in SAR images using machine learning (ML) and deep learning (DL) techniques. In particular, the targets of interest are oil platforms and ships located in the Campos Basin, Brazil. Two convolutional neural networks (CNNs), VGG-16 and VGG-19, were used for attribute extraction. The logistic regression (LR), random forest (RF), support vector machine (SVM), k-nearest neighbours (kNN), decision tree (DT), naive Bayes (NB), neural networks (NET), and AdaBoost (ADBST) schemes were considered for classification. The target classification methods were evaluated using polarimetric images obtained from the C-band synthetic aperture radar (SAR) system Sentinel-1. Classifiers are assessed by the accuracy indicator. The LR, SVM, NET, and stacking results indicate better performance, with accuracy ranging from 84.1% to 85.5%. The Kruskal–Wallis test shows a significant difference with the tested classifier, indicating that some classifiers present different accuracy results. The optimizations provide results with more significant accuracy gains, making them competitive with those shown in the literature. There is no exact combination of methods for SAR image classification that will always guarantee the best accuracy. The optimizations performed in this article were for the specific data set of the Campos Basin, and results may change depending on the data set format and the number of images.
Keywords	basins ; data collection ; decision support systems ; image analysis ; oils ; polarimetry ; regression analysis ; support vector machines ; synthetic aperture radar ; Brazil
Language	English
Dates of publication	2022-0621
Publishing place	Multidisciplinary Digital Publishing Institute
Document type	Article
ZDB-ID	2513863-7
ISSN	2072-4292
ISSN	2072-4292
DOI	10.3390/rs14132966
Database	NAL-Catalogue (AGRICOLA)

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Article: Scale-up and energy estimations of single- and two-stage vinasse anaerobic digestion systems for hydrogen and methane production

Ramos, Lucas Rodrigues / Lovato, Giovanna / Rodrigues, José Alberto Domingues / Silva, Edson Luiz

Journal of cleaner production. 2022 May 15, v. 349

2022

Abstract: This study evaluated the full-scale vinasse anaerobic digestion for industrial application. Twelve scenarios were simulated, considering single (methanogenic reactor) and two-stage systems (acidogenic + methanogenic reactors), raw and concentrated ... ...

Abstract	This study evaluated the full-scale vinasse anaerobic digestion for industrial application. Twelve scenarios were simulated, considering single (methanogenic reactor) and two-stage systems (acidogenic + methanogenic reactors), raw and concentrated vinasse, thermophilic and mesophilic conditions for methanogenesis and usage of acidogenic or methanogenic reactor effluent to dilute vinasse. A single-stage anaerobic digestion system of 17,433 m³ necessary to treat all the raw vinasse produced by a mill with a grinding capacity of 3.3 million tons of sugarcane per season can generate a power of 11.1 MW with an energy yield of 4.6 MJ/kg CODᵣₑₘₒᵥₑd. Two-stage system scenarios where vinasse was diluted with acidogenic reactor effluent had worse energetic recoveries than the single-stage system. Nonetheless, the usage of the methanogenic reactor effluent to dilute vinasse and its own influent in a two-stage system achieved an energetic recovery at least 34% higher than that of the single-stage system. In the best two-stage scenario, the total working volume was 19,666 m³, combining thermophilic acidogenic reactors and mesophilic methanogenic reactors, with an energy yield of 7.0 MJ/kg CODᵣₑₘₒᵥₑd. The different combinations of temperatures allow for a safer and more economic operation. The proposed novel industrial configuration can be divided into two parallel acidogenic reactors of 1,800 m³ each, and those reactors are in series with eight parallel methanogenic reactors of 2,828 m³ each. The electricity produced by the full-scale system can supply an energy demand of 24 thousand inhabitants per harvest season (9.7 kWh per ton of sugarcane). This study presents a novel discussion for sugarcane industry decision makers, such as plant managers, process and project engineers, providing a trade-off between highest energy production, optimal COD removal and lowest reactor volume (CAPEX investment) that better fits their needs.
Keywords	anaerobic digestion ; chemical oxygen demand ; electricity ; energy ; harvest date ; hydrogen ; industrial applications ; methane production ; methanogens ; sugar industry ; sugarcane ; vinasse
Language	English
Dates of publication	2022-0515
Publishing place	Elsevier Ltd
Document type	Article
ISSN	0959-6526
DOI	10.1016/j.jclepro.2022.131459
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Flame temperature and alkali emission in combustion of sugarcane bagasse and straw

Salinas Carlos T. / Gonzales Leonardo / Bellido Luis Felipe / Ramos Lucas / Marcelo-Aldana Daniel

E3S Web of Conferences, Vol 323, p

2021 Volume 00035

Abstract: This work presents a numerical and experimental study in a laboratorial rig to measure local flame temperature and alkali emission during the combustion of sugarcane bagasse and straw. Tubular combustion chamber to simulate combustion in grate is used. A ...

Abstract	This work presents a numerical and experimental study in a laboratorial rig to measure local flame temperature and alkali emission during the combustion of sugarcane bagasse and straw. Tubular combustion chamber to simulate combustion in grate is used. A spectral analysis method in the visible spectrum was used for measurement of local temperatures in a sugarcane bagasse flame and sugarcane straw flame. The two-color method is used to calculate flame temperature. In flame reactive zone, the bagasse and straw flame temperatures in the range of 1420 to 1510 K and in the range of 1450 to 1550 K respectively are calculated. The intensity of alkali emission during the sugarcane bagasse and straw combustion is calculated using data of the spectrum in visible range. It was found that potassium emission is correlated with the instantaneous bagasse flame temperature in the reactive combustion zone. Emission of potassium and sodium during straw combustion is higher than in bagasse combustion. Temperature and alkali emissions along the flame height are measured.
Keywords	Environmental sciences ; GE1-350
Subject code	660
Language	English
Publishing date	2021-01-01T00:00:00Z
Publisher	EDP Sciences
Document type	Article ; Online
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Article ; Online: Relationship between agrarian contracts and renewable energy production in sugarcane agroindustry

de Almeida Patrícia J. / Salinas Carlos T. / Ramos Lucas / Marceço-Aldana Daniel

E3S Web of Conferences, Vol 323, p

2021 Volume 00002

Abstract: Many agroindustries that process sugarcane raw to produce sugar and ethanol, and for energy cogeneration have difficulties to obtain all the necessary raw material. The agrarian contract practice can allow access to land in order to increase the ... ...

Abstract	Many agroindustries that process sugarcane raw to produce sugar and ethanol, and for energy cogeneration have difficulties to obtain all the necessary raw material. The agrarian contract practice can allow access to land in order to increase the production of sugarcane, without immobilizing resources in terms of the purchase of land, reducing the idle capacity of industrial plant, and increasing the cogeneration of energy by burning bagasse and sugarcane straw. It appears that the form of production of sugarcane (i.e., through land leasing, sharecropping, independent producers, etc.) can significantly affect the total costs of the industrial process. This work looks to find an empirical relation between the type of sugarcane producers and the energy produced by the mill based on data of the Agricultural Census of Brazil and monitoring data of power plant operation parameters of a typical mill in Brazil. It was found that the sugarcane raw coming from lands worked for tenants and sharecroppers increased his participation 112% and 469% respectively in the energy generation in the period 2006 to 2017.
Keywords	Environmental sciences ; GE1-350
Subject code	670
Language	English
Publishing date	2021-01-01T00:00:00Z
Publisher	EDP Sciences
Document type	Article ; Online
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Article ; Online: Emotion regulation effects of Ayahuasca in experienced subjects during implicit aversive stimulation: An fMRI study.

Arruda Sanchez, Tiago / Ramos, Lucas Rego / Araujo, Felipe / Schenberg, Eduardo Ekman / Yonamine, Mauricio / Lobo, Isabela / de Araujo, Draulio Barros / Luna, Luis Eduardo

Journal of ethnopharmacology

2023 Volume 320, Page(s) 117430

Abstract: Ethnopharmacological relevance: Ayahuasca is a beverage used in Amazonian traditional medicine and it has been part of the human experience for millennia as well as other different psychoactive plants. Although Ayahuasca has been proposed as potentially ...

Abstract	Ethnopharmacological relevance: Ayahuasca is a beverage used in Amazonian traditional medicine and it has been part of the human experience for millennia as well as other different psychoactive plants. Although Ayahuasca has been proposed as potentially therapeutic as an anxiolytic and antidepressant, whilst no studies have been carried out so far investigating their direct effect on brain emotional processing. Aim of the study: This study aimed to measure the emotional acute effect of Ayahuasca on brain response to implicit aversive stimulation using a face recognition task in functional magnetic resonance imaging (fMRI). Materials and methods: Nineteen male experienced Ayahuasca users participated in this study in two fMRI sessions before and after 50 min of the Ayahuasca ingestion. Subjects were presented with pictures of neutral (A) and aversive (B) (fearful or disgusted) faces from the Pictures of Facial Affect Series. Subjects were instructed to identify the gender of the faces (gender discrimination task) while the emotional content was implicit. Subjective mood states were also evaluated before Ayahuasca intake and after the second fMRI session, using a visual analogue mood scale (VAMS). Results: During the aversive stimuli, the activity in the bilateral amygdala was attenuated by Ayahuasca (qFDR<0.05). Furthermore, in an exploratory analysis of the effects after intake, Ayahuasca enhances the activation in the insular cortex bilaterally, as well as in the right dorsolateral prefrontal cortex (qFDR<0.05). In the psychometric VAMS scale, subjects reported attenuation of both anxiety and mental sedation (p < 0.01) during acute effects. Conclusions: Together, all reported results including neuroimaging, behavioral data and psychometric self-report suggest that Ayahuasca can promote an emotion regulation mechanism in response to aversive stimuli with corresponding improved cognition including reduced anxiety and mental sedation.
MeSH term(s)	Humans ; Magnetic Resonance Imaging ; Banisteriopsis ; Emotional Regulation ; Brain ; Emotions
Language	English
Publishing date	2023-11-17
Publishing country	Ireland
Document type	Journal Article
ZDB-ID	134511-4
ISSN	1872-7573 ; 0378-8741
ISSN (online)	1872-7573
ISSN	0378-8741
DOI	10.1016/j.jep.2023.117430
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Article ; Online: Continuous Hydrogen Production from Agricultural Wastewaters at Thermophilic and Hyperthermophilic Temperatures.

Ramos, Lucas Rodrigues / Silva, Edson Luiz

Applied biochemistry and biotechnology

2017 Volume 182, Issue 2, Page(s) 846–869

Abstract: The objective of this study was to investigate the effects of hydraulic retention time (HRT) (8 to 0.5 h) and temperature (55 to 75 °C) in two anaerobic fluidized bed reactors (AFBR) using cheese whey (AFBR-CW = 10,000 mg sugars ... ...

Abstract	The objective of this study was to investigate the effects of hydraulic retention time (HRT) (8 to 0.5 h) and temperature (55 to 75 °C) in two anaerobic fluidized bed reactors (AFBR) using cheese whey (AFBR-CW = 10,000 mg sugars L
MeSH term(s)	Agriculture ; Bioreactors/microbiology ; Hot Temperature ; Hydrogen/metabolism ; Waste Water/microbiology
Chemical Substances	Waste Water ; Hydrogen (7YNJ3PO35Z)
Language	English
Publishing date	2017-06
Publishing country	United States
Document type	Journal Article
ZDB-ID	392344-7
ISSN	1559-0291 ; 0273-2289
ISSN (online)	1559-0291
ISSN	0273-2289
DOI	10.1007/s12010-016-2366-3
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