bluuebunny/crossref_metadata_2025_split huggingface dataset:
Numerical investigation of active control of tearing mode by magnetic coils and the role of Δ′
Authors: He Yuling , Liu Yueqiang , Li Li , Yang Xu , Xia Guoliang 
Published: May 2021

Abstract
Magnetic feedback stabilization of the tearing mode (TM) is numerically investigated, utilizing the MARS-F code (Liu et al 2000 Phys. Plasmas
7 3681) for toroidal tokamak equilibria. With control coil configurations assumed in this study, magnetic feedback partially or fully stabilizes the TM, with either vanishing or finite equilibrium pressure. The best control is achieved by the combination of internal active coils and internal poloidal sensors. The internal and external tearing indices are evaluated for the close-loop system, based on the MARS-F computed mode eigenvalue and eigenfunction, respectively. In the absence of the favorable curvature effect, these two indices are real-valued and quantitatively agree well with each other. For the equilibrium with finite pressure gradient at the mode rational surface, the favorable average curvature effect becomes important and the close-loop tearing index also becomes complex-valued, partly due to interaction of the feedback system with the dissipative wall eddy current response. Isolating the inner layer and outer region response to magnetic feedback, with either proportional or proportional-derivative actions, allows to establish that feedback stabilization of the TM occurs mainly due to modification of the behavior of the external ideal solution, further confirming the analytic result reported in He et al 2021 Phys. Plasmas
28 012504.
3D printed self-propelled composite floaters
Authors: Shabaniverki Soheila , Alvarez-Valdivia Antonio , Juárez Jaime J. 
Published: May 2021

Abstract
This article presents a method for fabricating millimeter scale self-propelled floaters that move under their own power in random trajectories. The floaters are fabricated using fused deposition modeling of ABS scaffolds that are encapsulated in, and subsequently dissolved from, polydimethylsiloxane. The evacuated millifluidic channels left by dissolving acrylonitrile butadiene styrene (ABS) scaffolds are filled in with an ethanol-infused polyethylene glycol diacrylate hydrogel that serves as the fuel to drive propulsion in a fluid. We examine the motion of four different shapes, finding that shapes with two open ends exhibited pulsation in their trajectory, while shapes with a single open end featured trajectories that directed it to move in circles. The mean square displacement (MSD) was constructed from these trajectories to measure the mean position variance and average velocity. The floater design with a single open end was measured to have a higher mean variance per unit time (2.9 mm2 s−1) and average velocity (4.4 mm s−1). These parameters were nearly twice as high in comparison to the slowest floater design, which had an mean variance per unit time and average velocity of 1.7 mm2 s−1 and 1.5 mm s−1, respectively. In order to show that the motion behaved in a manner that is similar to Brownian motion, we simulated the trajectories using a Langevin dynamic simulation. The result of these simulations showed excellent agreement between the measured and simulation MSD. To show the utility of these structures for mixing applications, we designed a floating spinner that completely mixes a mixture of dye and water within 12 s. Ultimately, the design process illustrated here may find use in variety of platforms that require sample mixing, cargo transport and sensing.
Contribution of joule heating and viscous dissipation on three dimensional flow of Casson model comprising temperature dependent conductance utilizing shooting method
Authors: Sohail Muhammad , Chu Yu-Ming , El-Zahar Essam R , Nazir Umar , Naseem Tahir 
Published: May 2021

Abstract
This report examines the flow of non-Newtonian fluids down a bilateral surface under the influence of a magneto-hydrodynamic effect that is applied in many fields seen in the applied sciences and has received the attention of researchers because of its vast usage. It is assumed that the movement of particles generated fluid due to the movement of walls in the light of horizontal and vertical directions. Thermal study is carried out by employing the contribution of Joule heating, viscous dissipation and radiation. The phenomena of variable thermal conductivity and mass diffusion coefficient are also used in the modeling of the law of conservation of energy transport and species. The contribution of Brownian thermocouple and diffusion is captured by using the Buongrino model. The impact of various impact parameters was sketched. The involvement of the various parameters is measured in terms of dimensional stress, heat rate and mass. The limitation case of the current investigation is compared with the case of the published publications and an excellent arrangement is noted. The rate of transfer of thermal energy at wall of hot surface has gained using large values of Prandtl number because of large values of Prandtl number results reduction in thermal boundary layer while ratio between momentum and thermal boundary layers called Prandtl number. Hence, reduction in thermal boundary layer (TBL) results maximum production in rate of transfer of thermal energy.
Precise and accurate cosmology with CMB×LSS power spectra and bispectra
Authors: Chen Shu-Fan , Lee Hayden , Dvorkin Cora 
Published: May 2021

Abstract
With the advent of a new generation of cosmological experiments that will provide high-precision measurements of the cosmic microwave background (CMB) and galaxies in the large-scale structure, it is pertinent to examine the potential of performing a joint analysis of multiple cosmological probes.
In this paper, we study the cosmological information content contained in the one-loop power spectra and tree bispectra of galaxies cross-correlated with CMB lensing.
We use the FFTLog method to compute angular correlations in spherical harmonic space, applicable for wide angles that can be accessed by forthcoming galaxy surveys.
We find that adding the bispectra and cross-correlations with CMB lensing offers a significant improvement in parameter constraints, including those on the total neutrino mass, Mν, and local non-Gaussianity amplitude, .
In particular, our results suggest that the combination of the Vera C. Rubin Observatory's Legacy Survey of Space and Time (LSST) and CMB-S4 will be able to achieve σ(Mν)=42 meV from galaxy and CMB lensing correlations, and σ(Mν)=12 meV when further combined with the CMB temperature and polarization data, without any prior on the optical depth.
The stringy origins of Galileons and their novel limit
Authors: Easson Damien , Manton Tucker , Parikh Maulik , Svesko Andrew 
Published: May 2021

Abstract
We show generalized Galileons — a particular subclass of
Horndeski gravity — arise from a consistent Kaluza-Klein reduction
of the low-energy effective action of heterotic string theory to
first order in α'. This suggests Horndeski theories of
gravity have a string-theoretic origin. The form of the Galileonic
terms is precisely fixed by parameters of the embedding spacetime,
so that only a specific subset of Horndeski theories is permitted by
string theory. A novel limit of the model is considered by
performing a dimensionfulrescaling of α'.
Neutrino signal dependence on gamma-ray burst emission mechanism
Authors: Pitik Tetyana , Tamborra Irene , Petropoulou Maria 
Published: May 2021

Abstract
Long duration gamma-ray bursts (GRBs) are among the least
understood astrophysical transients powering the high-energy
universe. To date, various mechanisms have been proposed to explain
the observed electromagnetic GRB emission. In this work, we show
that, although different jet models may be equally successful in
fitting the observed electromagnetic spectral energy distributions,
the neutrino production strongly depends on the adopted emission and
dissipation model. To this purpose, we compute the neutrino
production for a benchmark high-luminosity GRB in the internal shock
model, including a dissipative photosphere as well as three emission
components, in the jet model invoking internal-collision-induced
magnetic reconnection and turbulence (ICMART), in the case of a
magnetic jet with gradual dissipation, and in a jet with dominant
proton synchrotron radiation. We find that the expected neutrino
fluence can vary up to three orders of magnitude in amplitude and
peak at energies ranging from 104 to 108 GeV. For our
benchmark input parameters, none of the explored GRB models is
excluded by the targeted searches carried out by the IceCube and
ANTARES Collaborations. However, our work highlights the potential
of high-energy neutrinos of pinpointing the underlying GRB emission
mechanism and the importance of relying on different jet models for
unbiased stacking searches.
Calculation of double-β decay half-lives using an improved Primakoff-Rosen formula *
Authors: Zhi Qi-Jun , Zhang Xiao-Ping , You Ji-Lin , Zheng Qiang , Ren Zhong-Zhou 
Published: May 2021

Abstract
A systematic analysis on experimental data of the half-lives of nuclear double-

decays with two neutrinos (

) is performed based on the analytical formula proposed by Primakoff and Rosen. We improve the formula by considering the shell effects and refining the energy dependence of the phase-space factor. This improved formula can closely describe all available experimental half-lives of

decays, both for ground-state transitions and transitions from ground states of parent nuclei to the first

excited states of daughter nuclei. The calculated half-lives agree with the experimental data of ground-state transitions of all known eleven nuclei with an average factor of 2.3. Further predictions are provided for

-decay candidates with decay energies above 0.5 MeV. We compare different theoretical predictions and emphasize the importance of experimental measurements on the half-lives of double-

transitions between the ground state of

Ca,

Ge, and

Xe and the first

excited states of their corresponding daughter nuclei, which will be very useful for understanding the underlying mechanisms of double-

decays and for further studying the shell effects on nuclear transition matrix elements.
Grey Wolf Optimizer algorithm for solving the multi depot vehicle routing problem and its implementation
Authors: Diastivena D , Wahyuningsih S , Satyananda D 
Published: May 2021

Abstract
Multi Depot Vehicle Routing Problem (MDVRP) is one of Vehicle Routing Problem (VRP) variants. MDVRP is a VRP that uses more than one depot for the distribution process. In this paper, the MDVRP will be solved using the Grey Wolf Optimizer (GWO). This algorithm is inspired by hunting technique and hierarchy of grey wolves. The completion of MDVRP consists of two stages, they are grouping and routing. In the grouping stage, customers are grouped to nearest depot. In the routing stage, the route is determined at each depot using “route-first, cluster-second”. In the route-first phase a giant tour is formed by forming population array. In the cluster-second phase, a split will be conducted on the giant tour, so that a number of routes are formed with the total demand for each route does not exceed the vehicle capacity. The implementation of GWO algorithm for MDVRP was designed in Borland Delphi 7.0 programming language. The algorithm was tested using 2 depots and 9 customers formed 2 routes at each depot with a total distance of 833 km. Another test was carried out by comparing the GWO with the ACO using the Cordeau dataset. GWO gives the best result (shortest distance) than ACO.
Study of variable neighborhood descent and tabu search algorithm in VRPSDP
Authors: Christopher Y , Wahyuningsih S , Satyananda D 
Published: May 2021

Abstract
The application of graph theory can be used to solve distribution optimization problems, especially the Vehicle Routing Problems (VRP). One variant of VRP is the Vehicle Routing Problem with Simultaneous Delivery and Pickup (VRPSDP), which has particular constraints, namely requests, and returns, which are done simultaneously. The VRPSDP problems can be solved by a variety of algorithms, such as the tabu search algorithm and the Variable Neighborhood Descent (VND) algorithm. The basic principle of the VND algorithm is to determine the initial solution and repair the solution using the neighborhood operator. In this article, the initial solution is determined by the insertion heuristic algorithm and makes improvements using six neighborhood operators. The optimum condition of the VND algorithm is reached if there is the most optimal solution for all operators, and the solution has converged to a minimum value. The application of the VND algorithm on VRPSDP was made using Borland Delphi 7 software. The VND algorithm application program was tested using standardized data sets with 100 and 200 customers, then compared multiple routes, solutions, and gaps (%). For many customers, 100 and 200 on the two types of data sets, there are many more VND algorithm routes than the tabu search algorithm. The results of the distance solution for the four data sets show that the tabu search algorithm is smaller than the VND algorithm. The type c data set has a smaller gap compared to the type r data set for both 100 and 200 customers to test tabu search algorithms and VND algorithms.
Determination of the tourist route in Malang Raya by using ant colony optimization
Authors: Rozidi A , Anam S , Habibah U 
Published: May 2021

Abstract
Malang Raya is one of the most popular tourist destinations in Indonesia and has many interesting tourist attractions. Tourists need much time to visit all the tourist attractions. It is not possible to visit all the tourist attractions since vacation time is limited. Therefore, the method for determining the tourist route with the minimum time and satisfy the constraint is needed. The problem is Vehicle Routing Problem (VRP) and can be solved by meta-heuristic. There are several meta-heuristics that can be used to solve VRP, for example Genetic Algorithm (GA), Particle Swarm Optimization (PSO), and Ant Colony Optimization (ACO). ACO has the advantage of a good positive feedback mechanism when compared to GA and PSO. For this reasons, this paper presents the determination of tourist route in Malang Raya by using ACO. However, ACO tends to solution stagnation. In this paper, the solution stagnation of ACO will be solved by applying the dual pheromone tables. The results show that ACO with dual pheromone tables can solve the problem of determining tourist routes in Malang Raya well in terms of quality of solution because ACO with dual pheromone tables can obtain better results in the time cost of the route than standard ACO.
Construction of multiplicative groups in modular arithmetic
Authors: Purwanto  
Published: May 2021

Abstract
There are multiplicative groups in modular arithmetic. It is known that when n is a positive integer, the set of all positive integers less than and relative prime to n is a group under multiplication modulo n. Some authors have studied multiplicative groups in modular arithmetic, and many of these groups have been constructed. In this paper we review some of the constructions, including constructions using elements of a geometric sequence and elements of an arithmetic sequence. Some of the constructions are extensions of the existing groups, and some others are new constructions. We also show that it is possible to find other new constructions.
Automorphism of complete 2,3,4- ary trees
Authors: Rahmadani D , Sulandra I M , Damiatun  
Published: May 2021

Abstract
Let G be a simple graph with vertex set V(G) and edge set E(G). Automorphism of G is an isomorphism from G to itself. In other words, an automorphism of G is a permutation φ of V(G), which has the property that uv ∈ E(G) if and only if φ(u)φ(v) ∈ E(G), for every u, v ∈ V(G) that is φ preserves adjacency. The complete n-ary tree is a rooted-tree where its every internal vertex has exactly n children. The height of a rooted tree is the number of edges on longest path connecting the root to a leaf (a vertex of degree one). In this paper, we determine the number of automorphism of complete 2,3,4-ary trees with height h, for any positive integer h. We also conjecture the general formula to determine the number of automorphism of complete n-ary trees, for any n ≥ 5.
On square roots of matrices over the max-time semiring ℝ+
Authors: Sulandra I M , Isnia A N 
Published: May 2021

Abstract
The set of all nonnegative real numbers ℝ+ with respect to two operations ⊕ : (a, b) → max{a, b} and ⊙ : (a, b) → ab forms a semiring that is called a max-times semiring. A square matrix A over the semiring has a max-times square root if there is a matrix B over the semiring such that B ⊙ B = A. Whereas, a square matrix A over the semiring ℝ+ with respect to the tow usualy addition and multipliacation operation has a conventional square root if there is a matrix B over the semiring such that B × B = A. We begin this study by giving an example of an 3×3 upper triangular matrix over ℝ+ that has both conventional and max-times square roots. In this paper, we do research on necessary and sufficient conditions of matrix having max-times square roots and compare it to the conventional one. Furthermore, we determine necessary and sufficient conditions of such matrix having either one, both, or neither one. Finally, we investigate the numbers of square roots, if any, in each case under all conditions.
Spatial spillover model: a moment method approach
Authors: Atikah N , Rahardjo S 
Published: May 2021

Abstract
. The spatial effect can be in the form of a global overflow over time, which is called a spatial spillover. Spillover occurs when changes in one area cause changes in another. Spatial Durbin Model (SDM) is the development of the spatial autoregressive model (SAR), where the dependent variable and the independent variable both contain spatial effects. In this study, we will determine the estimation of the Spatial Durbin Model (SDM) parameters using the Method of Moment (MM). The results show that the parameter estimation using the Method of Moment in the Spatial Durbin Model (SDM) is unbiased and consistent.
Stability analysis of SIRS epidemic model on measles disease spreading with vaccination and migration
Authors: Kusmawati I S , Chandra T D 
Published: May 2021

Abstract
Measles or also called Rubeola 9 days measles is an infectious disease caused by the Paramyxovirus virus and is transmitted through coughing and sneezing characterized by fever, cough, runny nose, and reddish rashes on the skin. Measles is included in the endemic category in developing countries, one of which is Indonesia. In this paper, we analyze the stability of the SIRS epidemic model with vaccination and migration and simulate the model based on data obtained from the Indonesian Ministry of Health in 2015 and migration data from the SUPAS (Survei Penduduk Antar Sensus) in 2015. Based on the results of the analysis that has been done, we obtained two equilibrium points, namely disease-free equilibrium point and endemic equilibrium point. If the value of R
0 <1, then the disease-free equilibrium point is said to be locally asymptotically stable, and if the value of R
0 > 1, then the endemic equilibrium point is locally asymptotically stable. In the case of the spread of measles based on data in East Java Province in 2015, a basic reproduction number is obtained R
0 = 4,48609.10−5 <1 which means that measles is no longer epidemic in a certain time provided that vaccination must be carried out continously and evenly.
Dynamical Analysis Predator-Prey Population with Holling Type II Functional Response
Authors: Pusawidjayanti K , Asmianto  , Kusumasari V 
Published: May 2021

Abstract
In this article, we investigate the dynamical analysis of predator prey model. Interaction among preys and predators use Holling type II functional response, and assuming prey refuge as well as harvesting in both populations. This study aims to study the predator prey model and to determine the effect of overharvesting which consequently will affect the ecosystem. In the model found three equilibrium points, i.e., E
1(0,0) is the extinction of predator and prey equilibrium, E
2(x
2, 0) is the equilibrium with predatory populations extinct and the last equilibrium points E
3 (x
3, y
3) is the coexist equilibrium. All equilibrium points are asymptotically stable (locally) under certain conditions. These analytical findings were confirmed by several numerical simulations.
Kinetic energy of M2 tide in the Makassar Strait
Authors: Pelawi E S B S , Ikhwan M , Haditiar Y , Wafdan R , Muhammad M , Rizal S 
Published: May 2021

Abstract
The Makassar Strait (MS) is the main passage through the Pacific to Indonesian waters, which divides the islands of Kalimantan and Sulawesi. These waters are rich with natural resources. The research objective was to determine the energy produced by the M2 tides in the Makassar Strait. Ocean currents and energy are analyzed from the output of a two-dimensional numerical model. The results showed that the tidal flow velocity in the Makassar Strait was above 1 m/s, especially in Balikpapan (1.1975 m/s,) Mamuju (1.3379 m/s), and Pantoloan/Palu (1.2728 m/s). While the power or tidal current energy in Balikpapan is 3, 6238 × 104 kWatt, Mamuju is 2, 0215 × 105 kWatt, and Pantoloan/Palu is 7, 4006 × 105 kWatt. The tidal energy is intense in Pantoloan/Palu compared to other stations.
Facies probability application for gas reservoir characterization
Authors: Arifiani P A A , Haris A 
Published: May 2021

Abstract
Reservoir characterization through seismic inversion is the principle method in hydrocarbon exploration. Facies probability is an advance method of reservoir characterization which integrates model-based seismic inversion and facies classification to construct a better reservoir modelling. The reservoir modelling is produced from four main steps. First is crossplot analysis to define the relation between acoustic parameter and petrophysics parameter. Second, model-based seismic inversion to produce acoustic impedance volume from seismic data. Third, facies classification which is defined from porosity effective, shale volume and water saturation. Final step is Bayesian Inference Framework to model probability density function (pdf) of each facies. The result of crossplot analysis shows that there is a linear relationship between acoustic impedance and porosity hence the porosity volume can be derived from the model-based inversion result. Facies classification is divided into two categorical zone, pay and non-pay. Pay zone is categorized as a high porosity layer filled with gas. Its parameters fit with Vshale > 0.6, Sw < 0.7 and porosity effective > 0.22. Then estimation is run using Bayesian probability into acoustic impedance volume and porosity volume resulting probability volume of each facies.