cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.7743662
title: Offshore Energy Harvesting of a Marine Floating Pendulum Platform Model

description: Abstract This work presents an analysis of an ocean wave energy harvesting system. This system is composed of a direct current (DC) power generator attached at the middle-top of a floating platform. A pendulum is connected to the generator’s shaft. It is considered that the ocean waves motion swings the platform in the vertical direction, which transfers energy to the pendulum, making possible to convert mechanical energy, induced by the ocean wave, into a rotational motion due the pendulum and after in electric energy due the generator. With the objective to optimize the harvested power, several analyses of the pendulum parameters, ocean wave amplitude and frequency were carried out. This work was based on the Brazilian’s coast characteristics. Numerical and experimental results were performed which shows the efficiency of the conversion of mechanical energy provided by the pendulum into electric power.
DOI: 10.7284/127494
title: CTD (Conductivity, Temperature, Depth) data collected during research cruise AE1627 using a Sea-Bird SBE-911+ instrument system onboard the platform RV Atlantic Explorer

description: Original (unprocessed) data collected during a Field_expedition
DOI: 10.6084/m9.figshare.7743653
title: Vibration analysis of laminated functionally graded shallow shells with clamped cutout of the complex form by the Ritz method and the R-functions theory

description: Abstract The R-functions theory and Ritz approach are applied for analysis of free vibrations of laminated functionally graded shallow shells with different types of curvatures and complex planforms. Shallow shells are considered as sandwich shells of different types: a) face sheets of the shallow shells are made of a functionally graded material (FGM) and their cores are made of an isotropic material; b) face sheets of the shallow shells are isotropic, but the core is made of FGM. It is assumed that FGM layers are made of a mixture of metal and ceramics and effective material properties of layers are varied accordingly to Voigt’s rule. Formulation of the problem is carried out using the first-order (Timoshenko’s type) refined theory of shallow shells. Different types of boundary conditions, including clamped, simply supported, free edge and their combinations, are studied. The proposed method and the created computer code have been examined on test problems for shallow shells with rectangular planforms. In order to demonstrate the possibility of the developed approach, novel results for laminated FGM shallow shells with cut of the complex form are presented. Effects of different material distributions, mechanical properties of the constituent materials, lamination scheme, boundary conditions and geometrical parameters on natural frequencies are shown and analyzed.
DOI: 10.6084/m9.figshare.7743656
title: Calculation of reflectance and transmittance of optical birefringent networks based on cholesteric liquid crystals

description: Abstract In this paper we calculated reflectance and transmittance of different optical birefringent networks sandwiched between two isotropic media. To model optical phenomena in the considered systems, we applied the 4×4 matrix method. Some interesting reflectance and transmittance spectra and polar plots for different system parameters and arbitrary incident monochromatic light were reported. The illustrated and discussed results can be useful for understanding optical phenomena in numerous birefringent media. Especially, the reflectance and transmittance spectra computed in this article can be suitable for analysis of more advanced contemporary optical systems, i.e. photonic band gap materials based on cholesteric liquid crystals.
DOI: 10.6084/m9.figshare.7743662.v1
title: Offshore Energy Harvesting of a Marine Floating Pendulum Platform Model

description: Abstract This work presents an analysis of an ocean wave energy harvesting system. This system is composed of a direct current (DC) power generator attached at the middle-top of a floating platform. A pendulum is connected to the generator’s shaft. It is considered that the ocean waves motion swings the platform in the vertical direction, which transfers energy to the pendulum, making possible to convert mechanical energy, induced by the ocean wave, into a rotational motion due the pendulum and after in electric energy due the generator. With the objective to optimize the harvested power, several analyses of the pendulum parameters, ocean wave amplitude and frequency were carried out. This work was based on the Brazilian’s coast characteristics. Numerical and experimental results were performed which shows the efficiency of the conversion of mechanical energy provided by the pendulum into electric power.
DOI: 10.6084/m9.figshare.7743653.v1
title: Vibration analysis of laminated functionally graded shallow shells with clamped cutout of the complex form by the Ritz method and the R-functions theory

description: Abstract The R-functions theory and Ritz approach are applied for analysis of free vibrations of laminated functionally graded shallow shells with different types of curvatures and complex planforms. Shallow shells are considered as sandwich shells of different types: a) face sheets of the shallow shells are made of a functionally graded material (FGM) and their cores are made of an isotropic material; b) face sheets of the shallow shells are isotropic, but the core is made of FGM. It is assumed that FGM layers are made of a mixture of metal and ceramics and effective material properties of layers are varied accordingly to Voigt’s rule. Formulation of the problem is carried out using the first-order (Timoshenko’s type) refined theory of shallow shells. Different types of boundary conditions, including clamped, simply supported, free edge and their combinations, are studied. The proposed method and the created computer code have been examined on test problems for shallow shells with rectangular planforms. In order to demonstrate the possibility of the developed approach, novel results for laminated FGM shallow shells with cut of the complex form are presented. Effects of different material distributions, mechanical properties of the constituent materials, lamination scheme, boundary conditions and geometrical parameters on natural frequencies are shown and analyzed.
DOI: 10.6084/m9.figshare.7743656.v1
title: Calculation of reflectance and transmittance of optical birefringent networks based on cholesteric liquid crystals

description: Abstract In this paper we calculated reflectance and transmittance of different optical birefringent networks sandwiched between two isotropic media. To model optical phenomena in the considered systems, we applied the 4×4 matrix method. Some interesting reflectance and transmittance spectra and polar plots for different system parameters and arbitrary incident monochromatic light were reported. The illustrated and discussed results can be useful for understanding optical phenomena in numerous birefringent media. Especially, the reflectance and transmittance spectra computed in this article can be suitable for analysis of more advanced contemporary optical systems, i.e. photonic band gap materials based on cholesteric liquid crystals.
DOI: 10.7284/127493
title: GNSS (Global Navigation Satellite System) data collected during research cruise AE1627 using a Furuno GP-90 instrument system onboard the platform RV Atlantic Explorer

description: Original (unprocessed) data collected during a Field_expedition
DOI: 10.6084/m9.figshare.7743644
title: Low frequency radiation and possible harmful influence on biological systems

description: Abstract In this paper we present a theoretical study that shows the influence of low frequency radiation, mainly from mobile devices or Smartphones, and the possible damages associated with diseases caused by these kind of radiation. We indicate that the rise of reactive oxygen species, caused by non-ionizing radiation, can generate biological influence on the bioactivity. We argue that this type of radiation can, occasionally, be harmful and thus a potentially danger external agent.
DOI: 10.6084/m9.figshare.7743647
title: Equipartition of energy, Avogadro law and ratio of specific heats

description: Abstract The equipartition of energy in its simplest form, which is related to the translational motion of the molecules of a gas, was announced independently by Waterston in 1845 and by Clausius in 1857. In its more general form, it was formulated by Maxwell in 1860. Together with the relation between pressure and translational motion, given by the kinetic theory of gases, one can derive the equation of state of an ideal gas. One can also derive the Avogadro law, a fundamental law of physical chemistry as stated by Meyer and Mendeleev. From the equipartition of energy Boltzmann could explain the experimental ratio γ of the specific heats of diatomic gases, an explanation that was countered by Maxwell. We discuss these two conflicting explanation, and present an account and a critical analysis of the emergence of the law of equipartition of energy and other laws that preceded it but are understood as consequences or related to it. Our account includes also the Laplace relation between the speed of sound and γ, and the Clément and Desormes experiment to determine γ.
DOI: 10.6084/m9.figshare.7743650
title: Temperature influence on mobility and charge density model of photovoltaic cells

description: abstract Photovoltaic (PV) devices that capture the energy provided by the sun have great potential as renewable energy sources. However, the input parameters such as the luminous intensity and temperature of the solar cells tend to influence the operating characteristics in the solar panels. The inherent physical processes that cannot be altered limit the efficiency of photovoltaic cells, as well as temperatures above the ideal value of operation. We propose a diode model to represent a PV cell, presenting good approximation for a commercial silicon cell. In this work we report the model with the aid of Coughey Thoma's equation to obtain the results, which indicate decrease in the mobility of loads and subsequently evaluation in terms of the load carrier diffusion lengths in regions with ideal temperatures between 293.15 K to 301.15 K (20 °C and 28 °C). Results were compared with local temperature between 298.15 K at 308.15 K (25 °C and 35 °C), in a region with a PV plant in operation in the West of Bahia.
DOI: 10.6084/m9.figshare.7743650.v1
title: Temperature influence on mobility and charge density model of photovoltaic cells

description: abstract Photovoltaic (PV) devices that capture the energy provided by the sun have great potential as renewable energy sources. However, the input parameters such as the luminous intensity and temperature of the solar cells tend to influence the operating characteristics in the solar panels. The inherent physical processes that cannot be altered limit the efficiency of photovoltaic cells, as well as temperatures above the ideal value of operation. We propose a diode model to represent a PV cell, presenting good approximation for a commercial silicon cell. In this work we report the model with the aid of Coughey Thoma's equation to obtain the results, which indicate decrease in the mobility of loads and subsequently evaluation in terms of the load carrier diffusion lengths in regions with ideal temperatures between 293.15 K to 301.15 K (20 °C and 28 °C). Results were compared with local temperature between 298.15 K at 308.15 K (25 °C and 35 °C), in a region with a PV plant in operation in the West of Bahia.
DOI: 10.6084/m9.figshare.7743641
title: Wheel-surface model parameters estimation: sand humidity influence on traction effort of all-terrain unmanned vehicle

description: Abstract The aim of the paper is to present the experimental results for material model of the sand, case of wet and dry probe. Since traction and side forces derivation methodology and tire-round interaction models for on-road vehicles are widely described, there is a lack of methods for off-road vehicles. The methodology, presented in this work, includes test in various ground conditions and different driving direction. Test results, presented in the paper were acquired for dry and humid sand, for various tire tilt angle. Traction and side forces were acquired and then will be used for black-box model parameters identification of the wheel-ground interaction.
DOI: 10.6084/m9.figshare.7743644.v1
title: Low frequency radiation and possible harmful influence on biological systems

description: Abstract In this paper we present a theoretical study that shows the influence of low frequency radiation, mainly from mobile devices or Smartphones, and the possible damages associated with diseases caused by these kind of radiation. We indicate that the rise of reactive oxygen species, caused by non-ionizing radiation, can generate biological influence on the bioactivity. We argue that this type of radiation can, occasionally, be harmful and thus a potentially danger external agent.
DOI: 10.6084/m9.figshare.7743647.v1
title: Equipartition of energy, Avogadro law and ratio of specific heats

description: Abstract The equipartition of energy in its simplest form, which is related to the translational motion of the molecules of a gas, was announced independently by Waterston in 1845 and by Clausius in 1857. In its more general form, it was formulated by Maxwell in 1860. Together with the relation between pressure and translational motion, given by the kinetic theory of gases, one can derive the equation of state of an ideal gas. One can also derive the Avogadro law, a fundamental law of physical chemistry as stated by Meyer and Mendeleev. From the equipartition of energy Boltzmann could explain the experimental ratio γ of the specific heats of diatomic gases, an explanation that was countered by Maxwell. We discuss these two conflicting explanation, and present an account and a critical analysis of the emergence of the law of equipartition of energy and other laws that preceded it but are understood as consequences or related to it. Our account includes also the Laplace relation between the speed of sound and γ, and the Clément and Desormes experiment to determine γ.
DOI: 10.7284/127495
title: Winch data collected during research cruise AE1627 using a Markey DUSH-5 instrument system onboard the platform RV Atlantic Explorer

description: Original (unprocessed) data collected during a Field_expedition
DOI: 10.6084/m9.figshare.7743632
title: Association between Smoking and Alcohol Consumption and the Severity of Coronary Artery Injuries in Patients with AMI

description: Abstract Background: Smoking is the most important risk factor for coronary heart disease (CHD) and ischemic events; alcohol consumption, on the other hand, appears to have a protective role. Objective: Assess the association between smoking and alcohol consumption with the severity of coronary artery injuries in patients with acute myocardial infarction (AMI). Methods: Cross-sectional study, performed in Santa Catarina. Variables were evaluated using the Chi-squared T/Fisher’s exact test, Kendall’s correlation coefficient, Student’s t test or Mann-Whitney U test. Values of p &lt; 0.05 were considered significant. Results: Between August 2016 to June 2017, 226 patients were evaluated with first episode of AMI. There was a difference in sex distribution, showing that 59.7% of men and 85.4% of women were not alcoholic (p &lt; 0.001). There was a higher prevalence of non-hypertensive patients who consumed alcohol than hypertensive ones (40.7% vs. 24.4% and p = 0.010) and patients without diabetes who had drinking habits than those diabetic (36.4% vs. 12.0% and p = 0.001). There was also a higher prevalence of non-diabetic patients who smoked than diabetic ones (38.1% vs. 22.0% and p = 0.035). A weak and negative correlation was found between the number of cigarettes per day and the pack-year with the TIMI frame count (r = -0.174 and p = 0.041 and r = -0.192 and p = 0.027, respectively). The other associations did not show statistical significance. Conclusion: The study showed that the number of cigarettes consumed per day and the pack-year is related to a smaller TIMI frame count, i.e., to a better coronary flow, which may be related to the Smoker’s Paradox. There was no correlation between the beverage type and quantity with the SYNTAX score, Ejection fraction and TIMI frame count.
DOI: 10.6084/m9.figshare.7743635
title: Energy harvesting through pendulum motion and DC generators

description: Abstract In this paper a mathematical model was found, and numerical results obtained for the pendulum behavior when coupled to a DC generator. A simple pendulum is vertically excited on its support and consequently exhibiting oscillations and rotations. The motion of the pendulum spins the axis of a DC generator and inducing a current. The dynamic model involving the generator and the pendulum dynamics is developed and analyzed in this article. Bifurcation diagrams demonstrate doubling-period and saddle-node bifurcations with the chaos. The presence of chaos is verified by the Lyapunov exponents applied on the time series of the pendulum speed and position. Nonideal interactions of a DC motor with a pendulum by a crank-shaft-slider mechanism is analyzed and compared with an ideal excitation of the pendulum.
DOI: 10.6084/m9.figshare.7743638
title: Ten Years-Snapshot of the Occurrence of Emerging Contaminants in Drinking, Surface and Ground Waters and Wastewaters from São Paulo State, Brazil

description: Emerging contaminants have been considered one of the main concerns for ensuring the quality of water around the world. This work presents the results of 10 years of analyses carried out in the state of São Paulo (Brazil) that has the high population density and intense agricultural and industrial activities. In this work 58 compounds (9 hormones, 14 pharmaceuticals and personal care products, 8 industrial compounds, 17 pesticides and 10 illicit drugs) were determined from 2006 to 2015 in 708 samples including raw and treated sewage, surface and ground and drinking waters. A preliminary risk assessment for aquatic life protection identified potential risks for caffeine, paracetamol, diclofenac, 17α-ethynylestradiol, 17β-estradiol, estriol, estrone, testosterone, triclosan, 4-n-nonylphenol, bisphenol A, atrazine, azoxystrobin, carbendazim, fipronil, imidacloprid, malathion and tebuconazole. Drinking water criteria were available only for 22 compounds and for them no adverse effects were expected at the concentrations found, except for 17β-estradiol.
DOI: 10.6084/m9.figshare.7743641.v1
title: Wheel-surface model parameters estimation: sand humidity influence on traction effort of all-terrain unmanned vehicle

description: Abstract The aim of the paper is to present the experimental results for material model of the sand, case of wet and dry probe. Since traction and side forces derivation methodology and tire-round interaction models for on-road vehicles are widely described, there is a lack of methods for off-road vehicles. The methodology, presented in this work, includes test in various ground conditions and different driving direction. Test results, presented in the paper were acquired for dry and humid sand, for various tire tilt angle. Traction and side forces were acquired and then will be used for black-box model parameters identification of the wheel-ground interaction.
DOI: 10.6084/m9.figshare.7743635.v1
title: Energy harvesting through pendulum motion and DC generators

description: Abstract In this paper a mathematical model was found, and numerical results obtained for the pendulum behavior when coupled to a DC generator. A simple pendulum is vertically excited on its support and consequently exhibiting oscillations and rotations. The motion of the pendulum spins the axis of a DC generator and inducing a current. The dynamic model involving the generator and the pendulum dynamics is developed and analyzed in this article. Bifurcation diagrams demonstrate doubling-period and saddle-node bifurcations with the chaos. The presence of chaos is verified by the Lyapunov exponents applied on the time series of the pendulum speed and position. Nonideal interactions of a DC motor with a pendulum by a crank-shaft-slider mechanism is analyzed and compared with an ideal excitation of the pendulum.
DOI: 10.6084/m9.figshare.7743638.v1
title: Ten Years-Snapshot of the Occurrence of Emerging Contaminants in Drinking, Surface and Ground Waters and Wastewaters from São Paulo State, Brazil

description: Emerging contaminants have been considered one of the main concerns for ensuring the quality of water around the world. This work presents the results of 10 years of analyses carried out in the state of São Paulo (Brazil) that has the high population density and intense agricultural and industrial activities. In this work 58 compounds (9 hormones, 14 pharmaceuticals and personal care products, 8 industrial compounds, 17 pesticides and 10 illicit drugs) were determined from 2006 to 2015 in 708 samples including raw and treated sewage, surface and ground and drinking waters. A preliminary risk assessment for aquatic life protection identified potential risks for caffeine, paracetamol, diclofenac, 17α-ethynylestradiol, 17β-estradiol, estriol, estrone, testosterone, triclosan, 4-n-nonylphenol, bisphenol A, atrazine, azoxystrobin, carbendazim, fipronil, imidacloprid, malathion and tebuconazole. Drinking water criteria were available only for 22 compounds and for them no adverse effects were expected at the concentrations found, except for 17β-estradiol.
DOI: 10.7284/127497
title: CTD (Conductivity, Temperature, Depth) data collected during research cruise AE1628 using a Sea-Bird SBE-911+ instrument system onboard the platform RV Atlantic Explorer

description: Original (unprocessed) data collected during a Field_expedition
DOI: 10.6084/m9.figshare.7743632.v1
title: Association between Smoking and Alcohol Consumption and the Severity of Coronary Artery Injuries in Patients with AMI

description: Abstract Background: Smoking is the most important risk factor for coronary heart disease (CHD) and ischemic events; alcohol consumption, on the other hand, appears to have a protective role. Objective: Assess the association between smoking and alcohol consumption with the severity of coronary artery injuries in patients with acute myocardial infarction (AMI). Methods: Cross-sectional study, performed in Santa Catarina. Variables were evaluated using the Chi-squared T/Fisher’s exact test, Kendall’s correlation coefficient, Student’s t test or Mann-Whitney U test. Values of p &lt; 0.05 were considered significant. Results: Between August 2016 to June 2017, 226 patients were evaluated with first episode of AMI. There was a difference in sex distribution, showing that 59.7% of men and 85.4% of women were not alcoholic (p &lt; 0.001). There was a higher prevalence of non-hypertensive patients who consumed alcohol than hypertensive ones (40.7% vs. 24.4% and p = 0.010) and patients without diabetes who had drinking habits than those diabetic (36.4% vs. 12.0% and p = 0.001). There was also a higher prevalence of non-diabetic patients who smoked than diabetic ones (38.1% vs. 22.0% and p = 0.035). A weak and negative correlation was found between the number of cigarettes per day and the pack-year with the TIMI frame count (r = -0.174 and p = 0.041 and r = -0.192 and p = 0.027, respectively). The other associations did not show statistical significance. Conclusion: The study showed that the number of cigarettes consumed per day and the pack-year is related to a smaller TIMI frame count, i.e., to a better coronary flow, which may be related to the Smoker’s Paradox. There was no correlation between the beverage type and quantity with the SYNTAX score, Ejection fraction and TIMI frame count.