bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of environmental parameters on the shrimp catch in Banyuasin Coastal Water, South Sumatra, Indonesia
Authors: Fauziyah  , Agustriani F , Purwiyanto A I S , Putri W A E , Suteja Y 
Published: August 2019

Abstract
Shrimps are species with short life cycle and particularly sensitive to environmental conditions since both marine and coastal habitat. However, changes in some environmental parameters were thought to be the most important which can affect the shrimp catch. This research aimed to determine the environmental parameters that most influence the shrimp catch in the Banyuasin Coastal Waters. Sampling for shrimp catch was conducted at 11 stations in Banyuasin Coastal Water used a trammel net. In situ environmental parameters such as water temperature, salinity, pH, current velocity, chlorophyll-a concentration, depth, substrate types, phosphates and nitrates concentrations were recorded during each sampling time. The influence of environmental parameters on the shrimp relative-abundance was analyzed by stepwise multiple regression and the significance level adopted was p < 0.05. The analysis results indicated that approximately 64.5% of the variation in the relative abundance of shrimp was explained by pH and substrate types. There were a strong correlation between the relative abundance of shrimp and in situ environmental parameters (0.50 < adjusted R2 = 0.645 ≤ 0.75), particularly pH and substrate types. The shrimp relative-abundance was positively correlated with pH, but negatively with substrate types. Thus, pH and the substrate types were determinant factors to the shrimp relative-abundance in the study area.
Distribution of phytoplankton diversity and abundance in Maspari island waters, South Sumatera, Indonesia
Authors: Rozirwan  , Iskandar I , Hendri M , Apri R , Supardi  , Azhar N , Mardiansyah W 
Published: August 2019

Abstract
Phytoplankton diversity is one of eutrophication indicator in Maspari island, south Sumatra, but its existence is strongly influenced by the physical-chemical parameters of the waters. This study aims to determine the distribution of phytoplankton diversity and their relationship with physical-chemical parameters in the waters of Maspari island. The methodology of research carried out was the physical-chemical parameter data collection, and phytoplankton samples were taken randomly on the surface of the water of 20 stations. Samples were identified types, analysed diversity, dominance and abundance calculations. For the relationship between diversity and abundance of phytoplankton with physical-chemical parameters of water carried out by principal component analysis (PCA). The results obtained that some of the physical-chemical parameters of Maspari Island waters have high variations such as turbidity ranging from 17,313 to 89,313 FTU. Current speed about 0.0-1,418 m.s−1. Dissolved oxygen about 3.78±0.18-6.18±0.15 mg.1−1. Nutrient concentrations such as NO3 about 0-0.28 mg.l−1 and PO4 about 0-0.2 mg.1−1, while the other parameters were smaller variations. Phytoplankton types found in four classes, namely Coscinodiscophyceae (7 species) with an abundance of 121,910.82 cell.m−3 (49%), Dinophyceae (4 species) with an abundance of 54,649.68 cell.m−3 (26%), Bacillariophyceae (3 species) with an abundance of 56,050.95 cell.m−3 (23%), and Fragilariophyceae (1 species) with an abundance of 5,605.09 cell.m−3 (2%). Diversity index shows low to moderate categories, while dominance in categories tends to dominate. PCA results showed that the physical-chemical parameters of the Maspari island waters of the identifier is the temperature, density, nitrate, salinity, DO and phosphate.
Identification of surface macro debrisin river flow and estuary of Musi River, South Sumatera Province, Indonesia
Authors: Maherlsa R , Purwiyanto A IS , Agustriani F , Putri W AE , Fauziyah  , Ferdiansyah  
Published: August 2019

AbstractThe Musi River is one of the largest and densest rivers in South Sumatra Province, Indonesia. Various activities are found along the river flow, in the upstream to the estuary, causing the river to be vulnerable for input of macro debris. This research aims to identify the type of material and the size of macro debris found along the river flow to the estuary of the Musi River. The research was carried out by performing macro debris sampling using a net operated with a manta system. This research used 10 stations that represent activities along the flow with tracking lengths as far as 87 km to the estuary. The results showed that the highest numbers of macro debris were found at Station 2 (fisherman settlement) which was is 33 items. The material of macro debris was is dominated by plastic material in all stations, with litter codes food packaging and had have medium size (2.5-10 cm).
Big Bang Nucleosynthesis and the Lithium Problem
Authors: Bertulani C.A. 
Published: August 2019

Abstract
I briefly describe the cosmological lithium problems followed by a summary of our recent theoretical work on the magnitude of the effects of electron screening, the possible existence of dark matter parallel universes and the use of non-extensive (Tsallis) statistics during big bang nucleosynthesis. Solutions within nuclear physics are also discussed and recent measurements of cross-sections based on indirect experimental techniques are summarized.
The role of nucleon knockout in pre-equilibrium reactions
Authors: Chimanski E V , Carlson B V , Capote R , Koning A J 
Published: August 2019

Abstract
Nucleon-induced pre-equilibrium reactions are predominantly direct reactions. At low incident energies, excitation of all but the lowest energy collective states can be well described in terms of one-step reactions that produce particle-hole pairs. As the incident energy increases, the probability of exciting a nucleon to the continuum rather than to a bound particle state also increases. These knockout nucleons can escape the nucleus or induce secondary collisions that create still other continuum or bound particle-hole pairs. We discuss their role in pre-compound nuclear reactions here, first in a semiclassical Monte Carlo description of the reaction and then in a quantum one-step calculation.
Searching signature of neutrino-nucleus coherent scattering with Mössbauer Spectroscopy
Authors: Marques C , Dias G S , Chavez Sanchez H H , Duarte S B 
Published: August 2019

Abstract
The Mössbauer spectroscopy is proposed as an alternative experimental technique to be pursued in the detection of Coherent Elastic ν-Nucleus Scattering (CENNS). The neutrino transferred energy in the neutrino-nucleus interaction causes a perturbation at the nuclear level structure of the Mössbauer isotope, leading to a displacement of the isomeric peak of the electromagnetic resonance. We calculate this isomeric shift correction due to the occurrence of CENNS and show that this quantity can be measured with enough precision in a typical Mössbauer spectroscopic experiment. We also shown that a reasonable number of events is expected and allow to extract the correction in the isomeric shift in a typical neutrino reactor flux. This isomeric shift correction is pointed out as a figure of merit for signature of CENNS in our proposal.
Ionizing radiation effects in a rectifier circuit
Authors: Bôas A C V , Guazzelli M A , Giacomini R C , Medina N H 
Published: August 2019

Abstract
This work aims to study the effects of ionizing radiation on a half-wave rectifier circuit. The diodes of the circuit, rectifier and Zener, were exposed to X-rays of 10 keV of effective energy. The characteristic curves of both diodes were evaluated before and after being subjected to cumulative total ionizing dose (TID) effects. The accumulation of charges in the dielectric structures of the diodes alter their individual functionalities, but the changes verified in the rectification were irrelevant. In this study, three irradiation methods were used to correlate the physical mechanisms responsible for the effects caused by radiation with variations in the electrical parameters of the devices and the efficiency of the rectifier circuit.
Ions concentration in blood samples of SJL/J dystrophic mice strains using X-ray fluorescence spectrometry
Authors: Giovanni D N S , Almeida M R , Zamboni C B , Metairon S , Balduino K N , Suzuki M F , Bueno C R 
Published: August 2019

Abstract
Star This study proposes an investigation of ions in whole blood of the dystrophic animal model SJL/J (mice strain with dysferlin protein deficiency) and in the control group (C57BL/6J) using the Energy Dispersive X-ray Fluorescence (EDXRF) spectrometry technique. The comparison between control and dystrophic mice results shown an increase in blood for P, S, K and Fe (p < 0.05) while a decrease in Ca (p < 0.05). This elemental analysis will contribute to evaluate the best diagnostic, care and treatment procedures, for the Progressive Muscular Dystrophy.
Study of induced activity of 167Ho from different neutron capture paths
Authors: Morais T S L , Dias M S 
Published: August 2019

Abstract
The main purpose of this study is to predict the induced activity of 167Ho produced by 165Ho(n,γ)166mHo(n,γ)167Ho, 165Ho(n,γ)166Ho(n,γ)167Ho and 166mHo(n,γ)167Ho reactions to choose the best path to measure the cross section with lowest uncertainty. The activation and decay scheme was established starting from the 165Ho target and considering single, double and triple neutron capture reactions. The activity results were deduced from differential activation equations and decay rates for all reaction products. The calculations were performed considering samples which were taken from a stock solution supplied by the Electrotechnical Laboratory (Japan) for purposes of an international comparison.
Neutrino emission from neutron star crusts
Authors: Ramalho S V C , Vicente G S , Duarte S B 
Published: August 2019

Abstract
Neutrino production is the dominant cooling process in neutron stars. After the rapid cooling during the protoneutron star stage, the neutron star crust is formed. Neutrinos continue to be produced in the crust, which can escape from the surface. This neutrino production is an important process to the final cooling phase of the star. They are produced in the crystalline lattice formed by nuclei permeated by an electronic gas. Quantum oscillations of the electron density with respect to the lattice of nuclei generates plasmons, which decay in a pair of neutrinos. Many works have studied the plasma of the nucleus in the star, however, without incorporating the effect of the lattice in the crust of the neutron star. The objective of this work is to include the lattice in the calculation of the plasmon decay rate using quantum field theory at finite temperature. It is not common to find studies on the crystalline lattice of the star using quantum field theory and the calculations generally used for neutrino emissivity consider a homogeneous and isotropic medium, which can not be directly applied in the context of neutron star crust.
The gluonic halo of the nucleons
Authors: Trevisan L A , Mirez C , da Silva D I 
Published: August 2019

Abstract
On the scope of the nonextensive statistical model for the nucleon’s structure function, we propose that gluons may occupy a bigger volume than the quarks, in nucleons. This correction is needed to fit the carry out momentum of each kind of particle. At the end of the work, we notice that the radius was not the only variable to be changed to get the goal of momentum adjustment and the another constraints.
A Monte Carlo model of deuteron emission in pre-equilibrium nuclear reactions
Authors: Teixeira E A , Carlson B V 
Published: August 2019

Abstract
Nucleon-induced pre-equilibrium reactions are important in many applications of nuclear physics. About 20% of the particles emitted in such reactions are composites, such as deuterons and alpha particles. Deuterons are produced through emission from the compound nucleus, as well as through two important direct reaction mechanisms - “pick-up” and coalescence. Iwamoto and Harada developed a semi-classical pre-equilibrium model that describes both direct mechanisms as a generalization of coalescence. We have implemented the Iwamato and Harada unified model of deuteron emission in Blann and Chadwick’s hybrid Monte Carlo model. This implementation was made in order to analyse data of reactions of the type (p,d), that is, proton induced reactions having deuterons as emitted particles, but our previous results were not satisfactory. In order to find a new approach for the deuteron emission, we are investigating an eikonal approximation to the phase space of Iwamoto and Harada model. We are also comparing our angular distributions with the experimental ones using DWUCK4. Nevertheless, our results are not satisfactory yet and our work is under development.
Consistent Skyrme parametrization and its critical parameter values
Authors: Dutra M , Lourenço O , Delfino A 
Published: August 2019

Abstract
A new Skyrme parametrization was developed based on a shortlist of Skyrme forces. These selected parameterizations, 16 in total, were found in a comprehensive study involving 240 parametrizations submitted to constraints related to nuclear matter properties. The critical parameters associated with the liquid-gas phase transition, critical density, critical pressure, and critical temperature are calculated for this new parametrization as well as its flash point.
Consistent relativistic mean-field models: symmetry energy parameter
Authors: Lourenço O , Dutra M , Hen O , Piasetzky E , Menezes D P 
Published: August 2019

Abstract
In this work, we revisit the study published in [Dutra et al., Chinese Physics C 42, 064105 (2018)] where 34 consistent relativistic mean-field models were analyze at the nuclear matter constraints in relation to the role of short-range correlations in the calculation of the symmetry energy and its consequence on the value of the gamma parameter.
Single-event effects: experimental setup for power MOSFETs and diffusion model for cross section calculations in low-voltage MOSFETs
Authors: Alberton S G , Medina N H , Added N , Aguiar V A P , Menegasso R , Macchione E L A , Silveira M A G 
Published: August 2019

Abstract
MOSFETs are subject to different types of Single-Event Effects (SEEs) induced by heavy ions, with low-voltage MOSFETs being more susceptible to non-destructive effects, such as Single-Event Transients, than high-voltage MOSFETs which may also be susceptible to destructive effects. In this paper an experimental setup used to study SEEs in power MOSFETs at the São Paulo 8UD Pelletron accelerator and computational simulations for SEE cross section calculations in low-voltage MOSFETs are presented.
Damping Measurements on a Multi-Blade Cascade with Multiple Degrees of Freedom: A Francis-99 Test Case
Authors: Bergan C W , Tengs E O , Solemslie B W , Østby P , Dahlhaug O G 
Published: August 2019

Abstract
Due to thinner blades and higher demands for flexibility, the high-head Francis runners designed today face considerable challenges that severely affect the runners’ expected lifetime. For many high-head Francis runners, the leading cause of fatigue is blade cracking due to Rotor-Stator Interaction, which cause vibrations in the runner blades.
Accurate prediction of the vibration magnitudes in a turbine is paramount in designing a reliable Francis runner. The understanding of the interaction between the hydrodynamic forces and the internal stresses in the runner is not yet sufficient to make this prediction. Previous investigations have identified some key parameters that affect dynamic behaviour in water, such as added mass, as well as added stiffness and damping from moving water. These parameters affect the natural frequency and damping of a structure, which in the end will affect what vibrations magnitudes the runner will be subjected to for a given frequency of excitation. The behavior of these parameters have recently been investigated by several researchers, but the effect of neighboring blades is yet not understood.
A multi-blade cascade has been tested for four of its different modes of vibration. The results indicate that the slope of the damping with respect to the inverse Strouhal number is constant. This slope was found to be the same as for several single-blade tested performed, both in the same rig and in other works. The implication is that the product of added mass and mode shape does not change significantly.
Francis-99: Coupled simulation of the resonance effects in runner channels
Authors: Tengs Erik , Salvesen Fevåg Live , Storli Pål-Tore 
Published: August 2019

Abstract
A resonance phenomenon is observed experimentally in the runner channels of the Francis-99 model turbine runner. An incompressible CFD simulation is unable to simulate this. Two different coupled physics schemes are therefore presented to investigate if such effects can be replicated through simulations. The first procedure is a fully coupled acoustic-structural simulation, where the surrounding fluid is modelled using acoustic theory. This includes added mass effects and pressure propagation, but not advective and viscous effects. The second procedure is a quasi two-way coupled Fluid-Structure approach based on modal decomposition of the structural domain. In this procedure, the incompressible Navier-Stokes equations are solved along with the structural deformation.
The fully coupled acoustic-structural approach does successfully exhibit a magnification of the pressure through the runner channels, indicating a resonance effect. The exact values of the acoustic pressure amplitudes are highly sensitive to the damping, the blade connection to the shroud close to the trailing edge, and more.
The second procedure manages to simulate the structural deformation with the correct nodal diameters excited by the Rotor Stator Interaction, all inside the fluid solver. The pressure amplitudes however, does not exhibit the desired resonance effect, likely due to the assumption of incompressible fluid.
Influence of the guide vanes design on stress parameters of Francis-99 turbine
Authors: Lazarevikj M , Stojkovski F , Iliev I , Markov Z 
Published: August 2019

Abstract
The frequencies with predominant amplitudes in low specific speed Francis turbines are related to rotor-stator interaction and they are calculated on the basis of the runner rotational speed and the number of guide vanes and runner blades. Pressure pulsations in the blade channels can be a reason for noise and vibration in the turbine above allowed level. High pressure pulsations can be caused by certain combination of runner blades and guide vanes number and/or resonance with one of the runner’s natural frequencies. The stress parameters of the Francis-99 turbine guide vanes and their modifications are analysed in this paper. The main aim is to determine the impact of the geometry modification (thinner for increased efficiency) of the guide vanes on the Francis turbine stresses by performing numerical simulations. The original Francis-99 turbine guide vane geometry and three modifications consisting of new guide vane shapes are being considered. The numerical investigation of the flow field is based on the k-ω SST turbulence model with ‘frozen rotor’ approach selected, constituting a quasi-steady state analysis, without taking into account the physical rotation of the runner to obtain Rotor-Stator Interaction (RSI). Pressure distribution on one guide vane determined by a Computational Fluid Dynamics (CFD) simulation of the turbine is coupled to a Finite Element Method (FEM) simulation in order to analyse the stresses. The results from the one-way fluid-structure interaction analysis give the stresses distribution and deformations of the guide vanes. Moreover, modal-acoustics analysis is conducted to obtain the natural frequencies of the guide vanes in water and comparison is made with the calculated vortex shedding frequencies to estimate the risk of resonance.
Numerical investigation of hydroacoustic pressure pulsations due to rotor-stator interaction in the Francis-99 turbine
Authors: Platonov D , Minakov A , Sentyabov A 
Published: August 2019

Abstract
The paper deals with the numerical simulation of the flow in the Francis-99 hydraulic turbine at three different problem formulations, namely, the application of the method of rotating coordinate system, sliding mesh model, and consideration of a compressible fluid. The pulsations intensity and pressure pulsation spectra obtained by numerical simulation and experimentally are compared. It is shown that the simulation of a problem considering compressible fluid, and that conducted by the sliding mesh method gives significantly greater pressure amplitudes. It is also shown that the precessing vortex core is a source of pressure waves in the entire turbine flow path.
Identification and correlation analysis for performance shaping factors in flight crew operation
Authors: Wang Lijing , Wang Yanlong , Chen Yingchun , Dong Dayong 
Published: August 2019

Abstract
The dependency between PSFs (performance shaping factors) is gaining increasing attention in HRA (human reliability analysis). In this paper, 79 PSFs were identified through literature review and discussion of focus group, which is composed of human factors/HRA specialists and civil pilots. These PSFs were classified into 10 categories as cognitive characteristics, physiological and psychological characteristics, personal and social characteristics, procedures, task characteristics, human-machine interface, system state, phenomenology characteristics, physical working conditions team and organizational factors. Then a survey of 299 pilots was conducted. A self-rate scale was used to investigate how the pilots were influenced by these PSFs. Correlation analysis shows that the correlations between PSF subsets are moderate to strong. The result suggests further research on the dependency between PSFs and PSF interactions need to be included in future HRA efforts.
Runtime Contracts Checker: Increasing Robustness of Component-Based Software Systems
Authors: Illarramendi M , Etxeberria L , Elkorobarrutia X , Sagardui G 
Published: August 2019

Abstract
Software Systems are becoming increasingly complex leading to new Validation &Verification challenges. Model checking and testing techniques are used at development time while runtime verification aims to verify that a system satisfies a given property at runtime. This second technique complements the first one. This paper presents a runtime contract checker (RCC) which checks a component-based software system’s contracts defined at design phase. We address embedded systems whose software components are designed by Unified Modelling Language-State Machines (UML-SM) and their internal information can be observable in terms of model elements at runtime. Our previous research work, CRESCO (C++ REflective State-Machines based observable software COmponents) framework, generates software components that provide this observability. The checker uses software components’ internal status information to check system level safety contracts. The checker detects when a system contract is violated and starts a safeStop process to prevent the hazardous scenario. Thus, the robustness of the system is increased.