bluuebunny/crossref_metadata_2025_split huggingface dataset:
Using pulsar’s braking indices to estimate changes in their moments of inertia with age-related considerations
Authors: Oliveira H O , Magalhaes N S , Marinho R M , Carvalho G A , Frajuca C 
Published: August 2019

Abstract
Pulsars are modeled as neutron stars originated from the collapse of a progenitor one. In the canonical model they are described by spherical magnetized dipoles that rotate with the magnetic axis usually misaligned relative to the rotation axis, and such misalignment would explain the observation of radiation emitted in pulses in a certain direction rendering the typical observational characteristic of this kind of star. The frequency of such pulses decays with time and it can be quantified by the braking index (n). In the canonical model n = 3 for all pulsars but observational data show that n
[negationslash] = 3. In this work we present a model for the understanding of the frequency decay of the rotation of a pulsar adapting the canonical one. We consider the pulsar a star that rotates in vacuum and has a strong magnetic field but, in contrast to the canonical model, we assume that its moment of inertia changes in time due to a uniform variation of a displacement parameter in time. We found that the old pulsars that present high values of the braking index tend to present smaller internal displacements of mass, in particular the superfluid neutron matter in the core. We relate this trend to neutron vortices’ creep in rotating superfluids, indicating a possible reason for this coincidence.
Effect of the nucleon-nucleon interaction on the fusion cross-section within the relativistic mean field formalism
Authors: Bhuyan M , Kumar Raj , Carlson B V 
Published: August 2019

Abstract
We establish a relationship between the nucleon-nucleon interaction potential and the nuclear fusion reaction cross-sections at low energies. The axially deformed self-consistent relativistic mean field is used with the non-linear NL3* interaction parameter set. The Wong formula is used to estimate the fusion cross-section for 58Ni + 58Ni and 48Ca + 238U systems, which are known to display fusion hindrance phenomena. The results of the application of the nucleus-nucleus optical potential for the fusion cross-section from the recently developed effective relativistic NN-interaction (R3Y) potential is compared with the well-known, phenomenological M3Y potential. The results obtained from our present calculation for the R3Y interaction are reasonable good as compared to the M3Y potential concerning the available experimental at barrier energies. The present analysis pursues a full microscopic studies of fusion process at low energies by taking the R3Y potential along with the relativistic mean field density instead of taking the M3Y interaction within the double folding approach.
Sodium analysis in sweeteners by neutron activation analyses technique
Authors: Medeiros I M M A , Zamboni C B , Giovanni D N S , Medeiros J A G 
Published: August 2019

Abstract
Evaluation of Sodium in sweeteners is important in nutritional investigations and for consumers: excessive sodium consumption is one of the major risk factors, responsible for hypertension and cardiovascular diseases. In this study, twelve brands acquired in markets of São Paulo city were analysed by Instrumental Neutron Activation Analyses technique (INAA). The aim was to verify compliance with ANVISA recommendation in relation to sodium level. The results were compared with the amounts recommended and with the tolerable intake limit (< 0.4 g/kg). The sodium concentration in sweeteners samples showed low content for most of the brands. The results shown that for the general population, it is not risk.
Study of the elemental composition of plants and extracts of medicinal plants through X-ray fluorescence
Authors: Estanagel T H P , Oliveira J M , Bonventi W , Aranha N , Chaud M V , Vila M M D C , Balcão V M , Yoshida V M H 
Published: August 2019

Abstract
Medicinal plant extracts are mostly used in different kinds of products in different areas, such as pharmaceutical, cosmetic, food and veterinary, being employed in different dosages and applications. It is known that the metabolism of the human body is regulated by the presence or absence of certain chemical elements. Some elements enter vital functions, such as potassium and calcium. Potassium helps in muscle contractions, especially of the heart muscle, and calcium enters as an specific element in the bone composition. Some other elements like heavy metals (As, Hg, Cd, and Pb) are highly toxic to the human body, even at quite low concentrations. Therefore, there is the need to investigate the chemical composition of plants and medicinal extracts, because the presence of some elements in levels concentrations, as well as the deficiency of others, can lead to a series of metabolic disorders in the human body. The main objective of this study was to evaluate the chemical composition of plants and extracts of medicinal plants, using the Energy Dispersive X-Ray Fluoresce (EDXRF) technique, to assessing the chemical composition of plants and extracts. The qualitative and quantitative chemical elements investigated in the plants and extracts were: As, Cr, Cu, Fe, Ni, Zn, Si, P, S, Cl, K, Ca, Ti, V, Mn, Co, Rb, Zr, Cd, Sn, Ba, Hg, Pb, Bi, Mo, Pd, and Pt.
Confinement effects from a PNJL model at zero temperature regime
Authors: Mattos O A , Lourenço O , Frederico T 
Published: August 2019

Abstract
The Polyakov-Nambu-Jona-Lasinio (PNJL) model is a model that incorporates confinement effects in the Nambu-Jona-Lasinio (NJL) model through the addition of the Polyakov loop (Φ). These effects are studied at finite temperature regime. However, at zero temperature its modified Fermi-Dirac distributions become step functions and Φ disappears from the equations of state (EOS), as well as the Polyakov potential, leading the model to the conventional form of the NJL model. In this work we propose a variation of the PNJL model where all the couplings depend on Φ with the constraint that the interactions vanish at the deconfinement phase where Φ reaches its maximum value and the quarks behave as free particles. In this approach, coupling constants of original PNJL model become now dependent on Φ. As a consequence, all equations of state present a dependence even at zero temperature regime. The thermodynamics of this new model is discussed.
Geometry and multiplicity in high energy collisions of d-Au
Authors: Gonçalves K J C , Torrieri D G , de Souza R A 
Published: August 2019

Abstract
In characterizing the strongly coupled QCD system produced in nuclear collisions an important uncertainity is the initial state, in particular the role of nuclear and subnuclear scale fluctuations in small systems. In this regard, the d-Au collision is a potentially unique probe since the deuterium nucleus contains only two nuclei, allowing potentially to separate nucleonic and sub-nucleonic dynamics from multiplicity cuts. We investigate this possibility via the PHOBOS Glauber Monte Carlo program. We calculate geometric quantities of the initial state of an ultra-relativistic collision between a deuterium and a gold nucleus, and systematically examine the relationship between geometry and experimental observables.
α-cluster structure in 62,64Ge described by the local potential approach
Authors: Souza M A , Miyake H , Borello-Lewin T , da Rocha C A , Frajuca C 
Published: August 2019

Abstract
The unstable nuclei 62Ge and 64Ge are analyzed in terms of the α + core structure applying a nuclear potential with (1 + Gaussian)×(W.S. + W.S.3) shape. The ground state bands of 62Ge and 64Ge and first negative parity band of 64Ge are calculated and compared with experimental data. The calculated 64Ge ground state band gives a good account of the experimental energies from 0+ to 8+ state. The rms intercluster separations and B(E2) transition rates are obtained for the 64Ge ground state band and a discussion is presented.
Predictions on the α-cluster structure in 104Te
Authors: Souza M A , Miyake H , Borello-Lewin T , da Rocha C A , Frajuca C 
Published: August 2019

Abstract
The present work analyzes the α + core structure in 104Te using the local potential model. The α + core interaction is described by a nuclear potential of (1 + Gaussian)×(W.S. + W.S.3) shape. The energy levels, total α widths and rms intercluster separations are determined for the ground state band and compared with a previous calculation which uses a double-folding potential. The two potential forms produce similar spectra between the 0+ and 14+ states. The antistretching effect is predicted for the 104Te ground state band, as is observed in previous α + core calculations in intermediate mass nuclei. An α-decay half-life T1/2,α
≈ 3 ns is predicted for 104Te in the α-decay energy Qα ≈ 5.36 MeV using an α preformation factor P = 1. The calculated T1/2,α
value is compatible with the recently reported experimental result on α-decay of 104Te.
AnalisaCAEN, a simple software suite to reduce and analyze coincidence data collected using CAEN v1724 digitizer
Authors: Zahn G S , Genezini F A , Ribeiro I 
Published: August 2019

Abstract
In this work a small software suite for the reduction and analysis of coincidence data collected using CAEN’s proprietary software was developed. These software check the output files for coincidences, generate a single list mode file with the coincident events, build histograms for each input, plus a time difference histogram and a 2-detector data matrix, perform time gates and allows for the subtraction of accidental coincidences, and perform energy gating on the final data matrices, generating histograms with the gated spectra. Moreover, the suite has an integrator that guides the user through all the required steps.
Francis-99 Workshop 3: Fluid structure interaction
Authors: Trivedi Chirag , Gunnar Dahlhaug Ole , Selbo Storli Pål-Tore , Kristian Nielsen Torbjørn 
Published: August 2019

Abstract
Francis-99 is a series of three workshops, which provides an open platform to the hydropower researchers. It gives the possibility to explore capabilities/skills on futuristic turbine design and development. Under the Francis-99 test cases, complete design and data of a Francis turbine are provided. The measurements are conducted on state-of-the-art facility at the Waterpower Laboratory, NTNU. The first workshop was organized during 15-16 December 2014, which focused on the steady state operating condition of the Francis turbine, i.e., best efficiency point, part load and high load. The second workshop was organized during 14-15 December 2016, which focused on the transient operating conditions, i.e., load variation and start-stop. The third workshop was organized during 28-29 May 2019, which focused on fluid structure interactions. In the third workshop, two test cases were provided: (1) Hydrofoil and (2) Francis turbine. The hydrofoil test case aimed to investigate fundamental research, and the turbine test case aimed to investigate applied research.
https://www.ntnu.edu/nvks/f99-third-workshop
FSI analysis of francis-99 hydrofoil employing SBES model to adequately predict vortex shedding
Authors: Čupr P , Štefan D , Habán V , Rudolf P 
Published: August 2019

Abstract
The added effects from the fluid on a structure submerged in water significantly affect its dynamic response. Since the hydraulic turbine runner is geometrically complex and involves complicated flow phenomena, the research on simple hydrofoil offers a unique opportunity to investigate added effects and mutual interaction of the elastic structure and vortical flow. For this purpose, the fluid structure interaction of Francis-99 hydrofoil was analysed using the Stress Blended Eddy Simulation (SBES). Advantage of this hybrid RANS-LES turbulence model over RANS models is shown by its enhanced ability to represent vortex shedding. The results of modal sensitivity analysis showed, that fillets of the fixed hydrofoil have negligible influence on the natural frequencies of the hydrofoil and therefore the simplified geometry was used. The modal analysis of fully fixed hydrofoil both in the air and submerged in water were carried out to investigate the added mass effect. Moreover, the hydrodynamic damping for various flow velocities was also investigated for the first bending mode. Overall results are complemented by sensitivity analysis of time step size and mesh for both structural and fluid domains. The results showed that the computed damping ratio above the lock-in and vortex shedding frequency at lock-in are largely underestimated. Therefore, the geometry with blunt trailing edge was additionally tested.
A Design Method of Two DOF Joint at the Base of Heavy-load Manipulator Based on Linear Driving
Authors: Dai Zongmiao , Wu Peizhang , Wang Qingyuan 
Published: August 2019

Abstract
In this paper, we propose a two DOF joint mechanical design scheme for heavy-load manipulator based on linear driving, the key structural parameters that directly influencing on the linear driving force is determined. Based on the multi-body kinematics and the principle of virtual work, we derive the relationship between the torque of joint space at the base of the heavy-load manipulator and the force of linear driving, then by analyzing the relationship, we obtain the design method of key structural parameters. Finally, using simulation analysis we validate this design method.
Improving the Absolute Accuracy by Online Interpolation Technique of Industrial Robots
Authors: Patel Darpan , Lienenlüke Lars , Storms Simon , Brecher Christian , Wied Johannes 
Published: August 2019

Abstract
This paper describes a novel method to improve the accuracy of industrial robot by calibration technique. Robot calibration is broadly classified into model-based and modeless techniques. In this paper, a modeless technique capable of interpolating the deviation along the Z-axis is defined which doesn’t consider any kinematic model, instead adapts interpolation method to compensate errors. The robot’s deviation is measured with a laser tracker and the deviation controlling parameters are calculated. The controlling parameters interpolate the deviation and with an online compensation program this deviation is compensated in real time scenario. This modeless technique is experimentally tested and it demonstrates a substantial improvement in the accuracy of the robot.
Fault Detection and Diagnosis for a Nonlinear Hydraulic Actuator
Authors: Ortiz Juan Felipe , Borrás Carlos , Sepulveda Diego 
Published: August 2019

Abstract
In this work a nonlinear dynamic and mathematic model for the position control of a hydraulic actuator with internal leakage was developed, simulations were made and a basic PID control in order to check the actuator behaviour. An internal leakage emulator was installed bypassing the two chambers of the hydraulic cylinder. Time and position data were acquired via Quanser Q8-USB and saved for modelling and validation purposes, sinusoidal and square signals and both for four fault conditions. Data were classified through MATLAB Simulink algorithm having in consideration parity equations and residual generation, obtaining a high level of validation for the proposed model and the desired responses and fault detection, diagnosis and classification.
Research on Condition Monitoring of Key Components in wind Turbine based on Cointegration Analysis
Authors: Sun Xide , Xue Dong , Li Runfei , Li Xiaogang , Cui Liye , Zhang Xishan , Wu Wei 
Published: August 2019

Abstract
Traditional models based on temperature trend can not comprehensively monitor the condition of wind turbine, besides, the threshold obtained from model can cause fluctuation when wind turbine operates under different conditions. In view of this, this paper presents a novel methodology based on cointegration analysis for continuously monitoring the operating conditions of wind turbine. The first step is to determine the optimal combination of parameters from normal SCADA sample data, by using the cointegration test. Then, perform the method of cointegration analysis to calculate the cointegration residuals and stationary threshold line under normal working space. When wind turbine component is operating out of the normal track, the data sample in cointegration residuals will exceed the stationary threshold line, and send the alert signals. The method is tested using SCADA data of wind turbine with known faults, the results demonstrate the proposed method can effectively monitor the abnormal state of generator and gear box, and provide the function of early warning.
A Low Cost Robotic Medical Simulator for CPR Training
Authors: Freire Fiallos A A , Rosero Plúa F M , Rea Minango S N 
Published: August 2019

Abstract
Medical simulators have become an important tool for teaching and developing skills in health personnel. The present work describes the design and construction of a simulator for cardiopulmonary resuscitation in adults, of intermediate fidelity, equipped with monitoring software. This device has an adult-size torso, with sensors and actuators controlled and monitored wirelessly through the user’s computer. The prototype aims to assist in the training of paramedics and first responders, due to its ability to show real-time data on the execution of the cardiopulmonary resuscitation maneuver. The simulator has been designed in a modular way so that it allows an easy assembly and change of pieces if necessary. The graphical interface gives feedback in real time on the effectiveness of the maneuver. Based on surveys carried out in trained personnel, it was confirmed that the simulator is very useful to carry out practices for which it was designed, as well as to reduce the cost of implementation by being built with materials available in the local market.
Study on a Real Time Scheduling Optimization Model for Multi-source Heterogeneous Distribution Network
Authors: Huang Hongyang , Huang Xiaoming , Lou Boliang , Ma Junchao , Lu Haiqing , Lv Wentao 
Published: August 2019

Abstract
Real-time scheduling for distributed power consumption can be heterogeneous distribution network problems, in this paper, an optimization model based on real-time scheduling based on the day before the scheduling model, the power supply capacity of the model based on load forecasting to make full use of distributed power and energy storage equipment, reduces in the peak period of the main power supply rely on, and the imperialist competitive algorithm based on the optimization model was solved. Through the simulation test, the power supply capacity of the real-time scheduling model can effectively utilize the distributed power and energy storage devices to reduce the peak power grid based on the running cost of distribution network is reduced by 2.59%.
Microstructure and Property of Fe-based Wear-resistant Alloy Coating Prepared by Laser Cladding on the Surface of Super High-speed Elevator Parts
Authors: Zhang Wei , Feng Qiuhong , Wang Eryi , Zheng Luyu 
Published: August 2019

Abstract
Aiming at the problem of poor wear-resistance of wear-resistant parts used in super high-speed elevator, the experiments of laser cladding to prepare composite coating were made. Fe-Cr-Ti-V-Mo-C powder was used as cladding material. The microstructure and property of composite coating were tested by relevant equipment. The research results show that the composite coating is made up of Cr3C2, TiC, VC, WC, Fe3C, Fe-based solid solution. The carbides present as network-like and distribute in solid solution. The average hardness of composite coating is 743 HV0.2, which is 91% higher than that of matrix. Using this technology to the surface strengthening of elevator parts, the wear resistance and service life can be greatly improved.
Structural S235 and S355 Steels – Numerical Analysis of Selected Rods Connection
Authors: Major M , Nawrot J , Major I 
Published: August 2019

Abstract
The paper discusses two structural steels: S235 and S355, commonly used for making steel rod structures. The numerical analysis of a selected rod connection with static load and butt connected using high strength bolts was made. Two material criteria were adopted, assuming for the first analysis S235 steel for the column and S355 for the beams, and for the second analysis, the S355 steel for both beams and the column. The numerical model prepared in this way covers the real work of the connection and is the basis for assessing the correctness of its work, i.e. maintaining safety during exploitation.
Preparation and Experimental Study of Three Element Mixed Molten Salt
Authors: Yan Quanying , Wang Chenyu , Jing Zhang , Liu Chao , Fan Qingzhu 
Published: August 2019

Abstract
36 kinds of mixed salts made of KCl, Na2CO3 and K2CO3 were prepared in this paper. The melting point and solidification point of the sample were studied by DSC, and the stability of the selected samples is also tested. The experimental results show that the smaller component of KCl, the smaller melting point of molten salt. The melting point of the samples which melted together was 570-580°C, and the freezing point is mainly between 550 and 570 C. The test ratio of the samples were selected from experiments was 2: 3: 5 (KCl: Na2CO3: K2CO3). The sample has a low melting point at 568.9°C and a low freezing point at 545.3°C, which can effectively avoid the blockage of piping system. The research results in this paper will provide reference and basis for the application of ternary mixed molten salt in solar energy field.
Kinetics Parameters Determination in Non-isothermal Conditions for the Decomposition Reaction of Calcium Carbonate by the True Activation Energy
Authors: Tan Guanglei , Mu Tao , Tang Dan , Wang Xiaomin 
Published: August 2019

Abstract
The true activation energy has been obtained by the trend extrapolation under the differential condition. The frequency factor and the reaction model can be uniquely determined by comparing the result of the model-fitting method with the true activation energy. The result is shown that, the true activation energy can be used to determine the kinetics parameters for the decomposition reaction of calcium carbonate under non-isothermal conditions.
Passivation Mechanisms of Atomic Layer-deposited AlOxFilms and AlOx/SiOxStack
Authors: Gong Lei , Zhou Chunlan , Zhu Junjie , Wang Wenjing , Ji Fangxu 
Published: August 2019

AbstractA new passivation layer of AlOx/SiOxwere prepared, in which 80 nm SiOxwas prepared by spin-coating perhydropolysilazane (PHPS) and annealed at 450°C. In order to compare the passivation effect of single AlOxlayers and the SiOx/AlOxstack on silicon surface, the fixed charge (Qf) in the passivated layers and chemical passivation effect were obtained by corona charge method. Fourier transform infrared spectroscopy (FTIR) and Time-of-flight secondary ion mass spectrometry (TOF-SIMS) was used to investigate the Si-H, Si-O bonds and the hydrogen profile in the passivation layer, respectively. The result reveals that the single layer of AlOxprovides good field effect with a large amount of negative Qf. Furthermore, SiOxcapping on AlOxhave more excellent chemical passivation because of amount of H saturate the dangling bonds on the silicon surface.