bluuebunny/crossref_metadata_2025_split huggingface dataset:
Model identification for prediction of dengue fever disease spreading using Bat Algorithm and backpropagation
Authors: Damayanti A , Hidayati N L , Pratiwi A B 
Published: May 2020

Abstract
Dengue fever disease is one of the public health problems in Indonesia growing rapidly and spreading widely. Dengue fever disease is caused by the dengue virus. The virus is spread by species mosquito Aides Aegypti and Aedes Alboctipus as primer vector as well as Aedes polynesiensis, Aedes scutellaris and AE (Finlaya) niveus as secondary vector. According to data from WHO, Pacific Asean bore 75 percent from dengue burden in the world during 2004 and 2010, while Indonesia is reported as the biggest second country with dengue fever disease cases between 30 endemic countries. One way to have a better understanding of the problem is by identifying the model based on the known data and do prediction. It is expected that the government would take action based on the prediction result. To solve this problem, the researcher using Bat Algorithm and artificial neural network backpropagation. In order to solve this problem. This paper purposes Bat Algorithm and Artificial Neural Network – Backpropagation to identify the spreading model. The purpose of the identification system using neural network backpropagation is to identify the ODE model of spreading dengue fever disease based on actual data. The first process is the estimation of parameters model using bat algorithm, with inquiring for a numeric solution from the ODE model spread of dengue fever disease as an objective function. The second process is model identification using artificial neural networks and the last, prediction of dengue fever spreading. T Based on the simulation result using dengue fever disease data start from January 2013 until December 2017 the MSE is 0.008 for identification process and 0,1728 for prediction process whereas The MSE value in validation process result is 0.1089 for identification process and 0.1617 for prediction process.
The proof of properties of dihedral group and its commutative elements
Authors: Muhammad H , Susilowati L , Fatmawati  
Published: May 2020

Abstract
In the field of abstract algebra, there is an important branch for the foundations of mathematics, namely group. The group is a non-empty set with some certain axioms. In the group, there is an interesting part, that is finite group. For the finite group has been defined the commutativity degree as the comparasion between the number of commutative elements of group and its order. If the finite group is commutative, then its commutativity degree is one. If the finite group is not commutative, then its commutativity degree is less than one. One example of a non-commutative finite group is a dihedral group. A dihedral group is a group which elements are the result of a composition of two permutations with predetermined properties. Keith Conrad in his article entitled “dihedral group” specifically discussed about the special properties of the group. Keith Conrad defined dihedral groups as a result of reflection and rotation operations. All the properties of dihedral groups are proven by geometry approach as the reflection and rotation. The purpose of this study is to prove the properties of dihedral group using functions, furthermore this research will examine which elements are commutative in dihedral group.
Adsorption of Gold(III), Copper(II), Nickel(II) on Amino Silica Hybrid Coated Magnetite
Authors: Thahir M T , Nuryono N , Santosa S J 
Published: May 2020

Abstract
Selective adsorption of Au(III) in multimetal systems Au3+/Cu2+/Ni2+ on Amino-Silica Hybrid coated Magnetite (ASHM) has been studied. ASHM was synthesized via a sol-gel process using magnetite that was obtained through coprecipitation of Fe2+/Fe3+ salts mixture with NH4OH as precipitating solution, sodium silicate solution of rice husk ash as a precursor and 3-aminopropyltrimethoxysilane (APTMS) as a source of amino. Adsorption kinetics was determined by pseudo-first-order and pseudo-second-order model, while the adsorption isotherm was analyzed studied by the Langmuir and Freundlich models. FTIR characterizations showed that ASHM has been successfully synthesized, indicated by the appearance of characteristic frequency at 570 cm−1 was stretching vibrations of Fe-O-Si, and the frequency at 3424 cm−1 was stretching vibrations of N-H. Adsorption kinetics studies showed that the adsorption of Au(III) on ASHM fit to pseudo-second-order model with adsorption rate constant was 1.21x10−3 g.mg−1min−1. ASHM adsorbent showed a linear plot of the Langmuir isotherm model with the adsorption capacity of Au(III) was 102,04 mg/g. Adsorption on multimetal showed that Au(III), Cu(II), Ni(II) were adsorbed with chemical interaction on the ASHM with capacity adsorption of Au(III) was higher than that of Cu(II) and Ni(II). ASHM has high enough selectivity for Au(III) toward Cu(II) and Ni(II) ions.
Kinetics Adsorption of Strontium(II) by Silica Xerogel from Fly Ash
Authors: Kundari N A , Megasari K , Yusephin C 
Published: May 2020

Abstract
A study of liquid waste adsorption containing strontium was carried out using the adsorption method using silica xerogel adsorbent. Silica xerogel synthesized from coal fly ash using the sol-gel method, produces a specific surface area of 84.8884 m2/g. This study was intended to determine the appropriate kinetics law. Data were obtained by following changes in Sr concentration to the time of adsorption at temperature of 25 ºC and 35 ºC. The data obtained was matched with 5 kinetic models, namely zeroth order kinetics, first order, second order, pseudo first order, and pseudo second order. Based on data analysis by means of linear regression and the number of minimum sum squared of errors, the adsorption kinetics model that is suitable for the adsorption of strontium by silica xerogel is a pseudo second order. The reaction rate constant at 298 K and 308 K were 0.1023 g/mg/min and 0.0716 g/mg/min respectively. The value of the activation energy is negative so the higher the temperature, the lower the adsorption rate. It is indicate that the adsorption is reversible.
Magnetic and microwave absorption properties of Mn4+ doped barium-natural ferrites prepared by the modified solid-state reaction method
Authors: Luthfianti H. R. , Widanarto W. , Ghoshal S. K. , Effendi M. , Cahyanto W. T. 
Published: May 2020

Abstract
Microwave wide-spread results in electromagnetic interference, environmental pollution, and hazards for health, thus microwave absorber is immediately needed. Mn4+doped barium natural ferrites were synthesized using the modified solid-state reaction method, which is a combination of the sol-gel method and the solid-state reaction. Commercial Ba(NO3)2, MnO2 and natural Fe3O4 were used as raw materials. Structural, magnetic properties and microwave absorption of the barium ferrites were characterized using XRD, VSM, and VNA, respectively. The results reveal that phase of BaFe2.37Mn9.63O19 dominates the diffraction peaks with the average size of crystallite 23.74 nm after adding Mn4+ ions in the barium ferrites. Ms value of the barium ferrite decreases with increasing concentrations of Mn4+ due to the surface effect of the nanoparticle. The MBF3 exhibited excellent performance that absorbs all given microwave frequencies with RL
below -10 dB and bandwidth of 4 GHz compared to the other samples.
Prospect of dark matter searches in split SUSY models
Authors: Okada Nobuchika , Minh Tran Hieu 
Published: May 2020

Abstract
The results from the XENON1T/Panda-X and IceCube experiments have set severe upper limits on spin-independent (SI) and spin-dependent (SD) scattering cross section of weakly interacting massive particles on nuclei. In the framework of split supersymmetry scenario supported by the LHC constraints, we investigate the prospect of dark matter (DM) direct and indirect detection experiments. Assuming a relation among gaugino masses at the grand unification scale, we have specified the parameter regions that predict the right DM relic abundance as well as satisfy the constraints on SI and SD scattering cross sections of DM. In the case of universal gaugino masses, the XENON1T/Panda-X results have ruled out completely the well-tempered neutralino region. We have found that 200 times smaller than the current IceCube bound is the sensitivity limit that a future DM indirect detection experiment should have at least in order to have a certain impact beyond the current XENON1T/Panda-X results. The future results from XENON1T will be able to test a signification portion of the Higgsino-like region. Although there are points in the Higgsino-like region that cannot be reached by future DM detection experiments, direct production channels of neutralino/chargino can be used to test the model at the LHC/HL-HLC. In the case of non-universal gaugino masses, beside showing the allowed parameter space, we have specified the regions that can be tested at both future DM direct and indirect detection experiments. One of them are Higgsino-like region, while the others two predict a well mixed bino-wino DM. The DM properties in each region have been examined and demonstrated with a benchmark of-ino spectrum. Interestingly, points in the mixed bino-wino region with rather light chargino can be tested the LHC 14 TeV.
Decay of neutron with participation of the light vector boson X17
Authors: Tien Du Pham , Ai Viet Nguyen , Van Dat Nguyen 
Published: May 2020

Abstract
The recently discovered light vector boson X17 at ATOMKI can trigger new decay channels of neutron, which can be used to explain the neutron lifetime puzzle. In this article, we calculate all the possible decay widths and discuss the physical implications.
Thermal expansion of metals Cu, Au and Ag at higher temperature and under pressure.
Authors: Duy Tan Pham , Dinh Tam Pham , Duc Tinh Bui 
Published: May 2020

Abstract
The thermodynamic properties of metals are studied using the moment method in the statistical dynamics, which allows us to take into account the anharmonicity of thermal lattice vibrations, going beyond the quasi-harmonic approximation. Within the fourth-order moment approximation, the free energy, equation of state and thermal expansion of the metals with fcc structure are given explicitly in terms of the effective pair potentials and the second-and fourth-order vibrational coefficients. Applying to Cu, Au and Ag metals, we calculate these properties at higher temperature and under pressure in simple analytic form. Numerical results for the lattice spacing, linear thermal expansion coefficient, pressure-volume dependence of these metals in different temperatures and pressures agree with the experiments and got better calculations than other authors.
New analysis characterizing the dynamics heterogeneity and microstructure in liquid silicates
Authors: Thu Nhan Nguyen , Khac Hung Pham 
Published: May 2020

Abstract
We use molecular dynamics simulation to study liquid silicates at ambient pressure and temperature of 3500 K. New analysis on structure and dynamics is carried out using such characteristics as the rate of bond-breaking events, link-cluster function and different subnet types. We found that the structural heterogeneity exists in short and medium length scales. Namely, the local environments of cations are quite different. The parking of SiOx
in the silicate systems is also very different. Further, the simulation shows that during a moderate long time the melt has a two-domain structure consisting of separate immobile domains and a mobile domain. These domain types differ strongly in the atomic mobility and chemical composition. The simulation also gives clear evidences for dynamics heterogeneity (DH) in the melt and that the non-uniform spatial distribution of bond-breaking events is responsible for the DH.
Molecular dynamics simulation of microstructure and atom-level mechanism of crystallization pathway in iron nanoparticle
Authors: Trang G T T , Kien P H , Hung P K , Ha N T T 
Published: May 2020

AbstractWe use the molecular dynamics simulation to study iron nanoparticles (NP) which consist of 5000 atoms at temperatures of 450 and 850 K. The crystallization and structure evolution was analyzed through pair radial distribution function, transition to different x-types, with x is the bcc, fcc and hcp, ico, 14, 12, and dynamical structure parameters. Simulation results that at 450 K, NP contains a large number of ico-type atoms which play a role in preventing of crystallization. The crystallization happened when NP was annealed at 850 K for 40 ns. Transitions to bcc-type do not happen arbitrarily at any location in NP, but instead they are focused in a non-equilibrium region. We showed that the crystallization pathway includes intermediate states between amorphous and crystalline phases. Firstly, a large cluster of cryst-atom is formed in a middle layer of NP. Next, this cluster grows up and the parameter for this cluster increases rapidly. Finally, the cluster of cryst-atom is located in a well-equilibrium region covered a major part of NP. The structure of crystalline NP is strongly heterogeneous and consists of separate local structure regions.
Seasonal divergence between soil water availability and atmospheric moisture recorded in intra-annual tree-ring δ18O extremes
Authors: Xu Guobao , Liu Xiaohong , Sun Weizhen , Szejner Paul , Zeng Xiaomin , Yoshimura Kei , Trouet Valerie 
Published: May 2020

Abstract
Intra-annual variability of tree-ring oxygen stable isotopes (δ18O) can record seasonal climate variability and a tree’s ecophysiological response to it. Variability of sub-annual tree-ring δ18O maxima and minima, which usually occur in different parts of the growing season, may exhibit different climatic signals and can help in understanding past seasonal moisture conditions, especially in Asian monsoon areas. We developed minimum and maximum tree-ring δ18O series based on sub-annual tree-ring δ18O measurements of Pinus massoniana at a humid site in southeastern China. We found that interannual variability in minimum tree-ring δ18O is primarily controlled by the July–September soil water supply and source water δ18O, whereas the maximum latewood tree-ring δ18O is primarily controlled by the relative humidity (RH) in October. The maximum of variability of earlywood tree-ring δ18O records the RH of October of the previous year. We used minimum and maximum tree-ring δ18O to develop two reconstructions (1900–2014) of seasonal moisture availability. The summer soil water supply (July–September self-calibrated Palmer drought severity index) and the RH in fall show contrasting trends, which may be related to late-growing seasonal warming leading to a high vapor capacity and high atmospheric moisture. Our findings are valuable for research that aims to explore seasonal moisture changes under anthropogenic climate change and the ecological implications of such contrasting trends.
Functional role of pectin in the bakery technology
Authors: Donchenko L V , Sokol N V , Sanzharovskaya N S , Khrapko O P , Mikhaylova T A 
Published: May 2020

Abstract
Current problems of the quality of wheat flour bread were analyzed. Here we studied whether apple pectin can be used in production of bakery goods. The significance of such properties of pectin as solubility, swelling, viscosity, susceptibility to acid and enzymatic hydrolysis for technological process were determined. Pectin radioresistance and detoxifying properties are equally important. Results of investigation of the apple pectin effect on dough fermentation process and quality and sorption properties of wheat bread are presented. Experimental substantiation of the most rational way of introducing pectin into dough is provided. The effect of pectic substances on the process of acid accumulation during dough fermentation is confirmed. Investigations were performed using methods of testing baking quality. We confirmed that addition of apple pectin leads to intensification of biotechnological processes and provides high quality and sorption properties of finished products.
Study of drum mixer operation during feed mixture preparation
Authors: Fudin K , Teruchcov V , Savinykh P , Konovalov V , Cupschev A 
Published: May 2020

Abstract
The purpose of the studies was to check the applicability of the drum mixer for the preparation of concentrated feed mixtures and to identify the dependencies of the change of mixture quality and energy consumption for mixing in the drum mixer with bent flat blades with holes on the following parameters: drum inclination angle, the fraction of control component and mixing cycle. Adequate representative regression nonuniformity models of mixture and energy consumption for mixing are obtained depending on the drum axis inclination angle in the range of 15-35 degrees, mixing time up to 20 min and the fraction of control component from 1 to 20%. Extreme values are not present. The reduction of the drum inclination angle and increase of the mixing time improves the quality of the mixture, as well as significantly increases the energy consumption of mixing. As the fraction of the control component increases from 1% to 10%, the quality of the mixture improves. Further increase in the fraction of the control component has little effect on the quality of the mixture. The variation coefficient of the control component content is reduced to 19% with the fraction of the control component equal 10% or more. As the fraction of the component decreases, the quality of the mixture decreases to 21%. As the quality of the mixture improves, the energy consumption increases. Such drum mixer may be used to prepare pre-mixtures only regardless of the fraction of the control component. In order to prepare high-quality feed mixtures, it is necessary to modernize the blades and their setting parameters.
Modular aggregation functions performed by static inverters in autonomous power supply systems
Authors: Grigorash O V , Popov A Y , Uskov A E , Denisenko E A , Kvitko A V 
Published: May 2020

Abstract
Static power inverters (SPI) are important functional elements to provide efficiency and reliability for autonomous power supply systems (APSS). The paper proposes to improve technical and economic characteristics of APSS through modular aggregation functions and reduced number of power electronic devices constituting SPIs. The paper provides a generalized SPC topology and insights into its performance. It deals with some electric schematic diagrams for a controlled rectifier and a three-phase modular inverter, a three-phase voltage inverter based on two single-phase inverters and a single-phase-three-phase rotating-field transformer, as well as a chain diagram for a universal modular static power inverter. It is shown that modular aggregation functions of APSS static power inverters will improve reliability through back-up operations performed by the main functional units and assemblies, and reduce time intervals for their maintenance and repair. The efficiency of autonomous systems will be advanced due to a decrease in the total number of power electronic devices constituting SPIs. In addition, the level of electromagnetic interference generated by these devices will decrease. A significant technical and economic effect will be achieved by using universal modular static inverters in the APS systems, capable of passing energy flows back and forth in both directions and operating in various modes.
Analysis of multivariate assessment methods for effective location of renewable energy facilities
Authors: Kirichenko A S , Kirichenko E V 
Published: May 2020

Abstract
The article emphasizes the importance of a method for assessing the efficiency of power plants based on renewable energy sources. The key criteria of the main multivariate models were analyzed and prioritized. The main current methods including those using fuzzy logic were studied. The technical, economic and legal characteristics that maximize the choice of the optimal methodology for assessing the effectiveness were identified. The method was selected on the example of Krasnodar Territory.
Technology of sunflower cake preparation
Authors: Priporov I E , Kurasov V S , Samurganov E E 
Published: May 2020

Abstract
For the production of sunflower cake, various technologies, which need to be improved, are used; it will increase the nutritional value of the feed which is a topical problem. To make possible the quality assessment of the protein feed, when it is prepared with components from piles of sunflower seeds in real time, the process is carried out by using multimedia devices at the stage of clearing the pile of sunflower seeds, as well as milling the prepared feed. The uniform-pitch screw value of a serial extruder is directly proportional to the first winding pitch and inversely proportional to the number of winds. By increasing the flight screw constant number, the winding pitch decreases and the processed material becomes compact. Reduction of the winding pitch aliquot to the screw is carried out exponentially. The compression ratio of sunflower seed components to obtain protein feed of a cake form with a winding pitch decrease aliquot depends on the design parameters of the extruder screw, which enables to regulate the technological process of its preparation in crumbly and granular forms. It depends on the screw winding pitch with its number, and by increasing the screw winding pitch the compression ratio is decreased, and contrariwise, with decreasing screw winding pitch the compression ratio of the processed material (sunflower cake) is increased.
Improvement of the efficiency of sunflower cake grinding
Authors: Priporov I E , Kurasov V S , Samurganov E E 
Published: May 2020

Abstract
The provision of animals and poultry with complete feed balanced in nutrition according to productivity is one of the key conditions for additional production and improvement of livestock quality and increase of protein. An improved sunflower cake grinder was proposed based on the given grinding techniques, which eliminates a number of disadvantages typical for serial products. Taking into account huge volumes of ground fodders, the problem of improving these grinders in terms of reducing their energy consumption is quite relevant. Besides, all known grinders are not suitable for sunflower cake grinding due to its physical and mechanical properties compared to other fodders. The paper describes the motion of the prepared sunflower cake along the surface of the cutting edge of knives in the form of a curved triangle of Archimedes arbelos with saw teeth in order to obtain it in a granular form. The Russian Patent 2648392 was obtained for the proposed design of the grinder, which allows expanding functional capabilities, reducing energy consumption of the process and improving the quality of grinding sunflower cake, which cannot be made by similar technical facilities. The knives in the grinder can be adapted for different fodder, both in granulated and dispersed form due to adjustment of distance between them depending on dimensions of processed material, which perform sliding cutting thus improving the efficiency of technological process. The obtained efficiency formula of the improved grinder allows increasing it depending on its design parameters and physical and mechanical properties of the material.