bluuebunny/crossref_metadata_2025_split huggingface dataset:
The effect of adhesive concentration variation on the characteristics of briquettes
Authors: Dewi R P , Kholik M 
Published: May 2020

Abstract
The depletion of fossil fuel reserves is increasingly encouraging people to see other renewable energy sources. Strategic steps can be taken is applying the concept of energy diversification. One of the simplest and easiest ways to diversify energy is through biomass energy utilization. Indonesia has abundant biomass energy sources, which can come from waste. Potential wastes that can be used as raw material for briquettes are sawdust and coconut shell waste. The purpose of this study was to determine the effect of variations in the adhesive concentration of starch on the characteristics of charcoal briquettes which include caloric value, moisture content, and ash content. The research is done with variating of adhesive concentration 4%, 6%, and 8% with sawdust and coconut shell composition 75%:25%. The research result shows that briquettes with 4% of adhesive concentration have caloric value 6974.022 Cal/g, moisture content 4.518%, and ash content 1.364%. Briquettes with 6% of adhesive concentration have caloric value 7561.582 Cal/g, moisture content 4.232%, and ash content 1.762%. Briquettes with 8% of adhesive concentration have caloric value 6996.102 Cal/g, moisture content 4.455%, and ash content 1.623%. The characteristics of briquette have fulfilled the value of briquette quality standard SNI 01-6235-2000. The most optimum of adhesive concentration in briquette production from the research was 6%.
Effect of virtual reality usage on postural stability
Authors: Pujiartati D A , Ananta M F , Muslim K , Setiawati N L P L S , Iridiastadi H 
Published: May 2020

Abstract
Virtual reality (VR) is a technology that has been widely used for various industrial purposes in recent days. Despite the potential benefits, VR usage may impose adverse effects that can prevent users from reaching their goals of using VR safely and comfortably. One potential adverse effect is the disruption of postural stability during VR usage. This study aimed to evaluate the effect of using VR on postural stability. Fourteen participants involved in the experimental set up playing a simulated game with Samsung Gear 3 Head Mounted Display (HMD) for 30 minutes with standing posture. During the experiment, the center of pressure data was obtained every 10 minutes using a force plate to calculate postural stability using three parameters including mean distance (MD), mean velocity (MV), and sway area (SA). The results showed that a longer duration of VR usage significantly increased MD and SA. Meanwhile, MV remained constant throughout the experiment. It means the use of VR may worsen users’ postural stability. Thus, caution should be used to develop a future guideline to increase VR safety.
The mineral content and vitamin d on bone flour fish yellowfin tuna
Authors: Talib A , Hariati A M , Nurhidayati F 
Published: May 2020

Abstract
Vitamin D is in charge of regulating the amount of calcium in the blood, bones, and intestines, besides this vitamin is also useful for increasing the number of cells of phosphate in the bones. Vitamin D is the only vitamin that is produced naturally by the human body, while under the light of the Sun. The purpose of this study is to conduct an analysis of the mineral content and vitamin D on bone flour fish yellowfin tuna. The results of mineral content of flour of the highest fish bones found on calcium and phosphorus (222.54; 107.08 mg/kg), while vitamin D with the best value found in the NaOH treatment (0.119 g/ml), whereas citric acid treatment is (0.173 g/ml) and treatment the control value (0.069 g/ml).
Effects of reading dhikr Asmaul Husna Ya Rahman and Ya Rahim against changes in the level of anxiety in the elderly
Authors: Agustina N W , Handayani S , Nurjanah L 
Published: May 2020

AbstractMany elderly experience anxiety because of something that is not clear. Anxiety can be overcome by dhikr therapy Asmaul Husna Ya Rahman and Ya Rahim. The research design is quasi-experimental. A population of 59 elderly with a sampling technique using purposive sampling. The research sample of 30 elderly. The research instrument was the GAI questionnaire. Data analysis using a paired t-test and Mann Whitney test. The result is a difference in the level of anxiety before and after the intervention in the intervention group with an average decrease of -4.067 (pValue = 0.000). In the control group with an average decrease of -1.333 (pValue = 0.001). Also, there was a difference in the level of anxiety reduction between the intervention group and the control group (pValue = 0,000). The conclusion is there is the effect of reading the dhikr of Asmaul Husna Ya Rahman and Ya Rahim to reduce the level of anxiety in the elderly.
Application of wavelet decomposition in volcanic seismic data
Authors: Dairoh  , Suryanto W 
Published: May 2020

Abstract
Volcanic data is in the form of broadband data that a wide range of frequencies and contains a high level of noise. So that the noise decomposition process must be chosen correctly, it is intended that the volcanic seismic recording data containing event information contained there is not decomposed. For This reason, noise decomposition has been carried out by applying the wavelet process, namely by using wavelet decomposition on the recording data at the Wanagama station during the Merapi volcano eruption 2010. This Decomposition of noise uses Daubechies db 5 level 5 detail 1 wavelet decomposition. Level 5 detail 1 is able to decompose noise well a volcanic event are obtained during the eruption. One of them is the event of deep volcanic event (VT-A), shallow volcanic earthquake (VT-B) and pyroclastic flows that occurred during Merapi eruption on October 26, 2010 and November 3, 2010.
The influence of mathematical basic concept of materials based on internalization of Islamic values against religious attitude
Authors: Ulia N , Sari Y , Yustiana S , Hariyono M 
Published: May 2020

Abstract
This study aims to find out the characteristics of basic mathematics concept teaching materials based on internalization of Islamic values, and to improve students’ religious attitudes through lectures using basic mathematics concept teaching materials based on internalizing Islamic values. The research method used is research development. Data collection techniques used were non-test techniques in the form of questionnaires. Analysis of the data used includes the validity of teaching materials analysis, practicality analysis of teaching materials, effectiveness analysis of teaching materials, descriptive statistics, and Gain normalization test. Learning using basic mathematics concept teaching materials based on internalizing Islamic values can improve students’ religious attitudes shown from the results of the initial questionnaire given an average score of 70.22% while the final questionnaire provided an average score of 87, 32%. An increase of 0.58 in the medium category based on the normalized gain test. From the results of the study, it is expected that the existing religious attitudes are more explored through learning and habituation. Because the lecturer is only a facilitator, certainly in improving religious attitudes the teacher is not centered, but it must be student centered.
Fuzzy-PI algorithm application to controlling servo motor position using microcontroller AVR
Authors: Rahmat  , Wiyono  
Published: May 2020

Abstract
Understanding implementation of control process in real application is not easy for common student that their study of control application. This research purpose to describe how algorithm Fuzzy-PI implementation in control position servo motor. Realisation of this research using circuit of microcontroller with before programmed with algorithm fuzzy-pi and then implemented to control rotation position servo motor. Method and step of process the research start with make module circuit microcontroller as circuit controlling servo motor position, and then make script program for to upload to circuit microcontroller. After that do experiment for get data with entry several parameters Fuzzy and PI and analysed result experiment. From result of experiment using microcontroller as controlling servo motor with fuzzy algorithm result controlling to arise very fast to state of stability. With using fuzzy algorithm parameter of Kp and Ki with autotune at optimum value. Result from this research a prototype device for experiment facility students for understanding algorithm Fuzzy PI in the real device and make easier for learning and understanding concept control system application in a device electronic.
Using 3D animation combined with augmented reality for promotion media: Case study of STMIK Bina Patria
Authors: Priyoatmoko W , Arifah F N 
Published: May 2020

Abstract
STMIK Bina Patria as the first computer academy in Magelang, prepares students to have competitive advantages and improving added value in the field of Science and Technology. Since the establishment of STMIK Bina Patria in 1999, this institution has experienced significant progress, seen from the increasing number of students and improvement of the infrastructure to support teaching and learning activities. Brochures and billboards are used for promoting the campus. But the impact is far from its expectation. Seeing these conditions, improvement is needed to intensify media promotion functions at STMIK Bina Patria. Therefore, the researcher constructs Augmented Reality 3D animation of STMIK Bina Patria. Augmented reality (AR) is constructed using Multimedia Development Life Cycle (MDLC) research method consisting of Concept, Design, Material Collecting, Assembly, Testing and Distribution. Constructing begins by taking pictures, followed by designing STMIK Bina Patria building using Blender software. Unity and Vuforia Library software are used to design the AR application. The results of this study are Augmented Reality introduction media Application of S TIMIK Bina Patria Magelang which can be run on an Android. By using this media, it is expected that people are more interested in studying at STMIK Bina Patria.
Three-phase electric motor isolation diagnosis modelling caused unbalance voltage using radial basis function network
Authors: Sahrin A , Purnomo M H 
Published: May 2020

Abstract
One of the Diagnoses of three-phase electric motor isolation is caused by unbalanced voltage. The National Electrical Manufacturers Association (NEMA) standard for unbalanced voltage is 1%. The diagnosis of electric motor isolation is too complex to be modelled in mathematical form. Therefore, this paper proposes to model the electric motor isolation caused by unbalanced voltage using the Radial Basis Function Network (RBFN). RBFN is implemented for training and testing data with input variations number of unbalanced voltages, running hours, voltage, current, temperature, rotation speed, and output variations number of insulation resistance. The modelling process is comparing the number of neurons and the learning rate to get accuracy and speed of time. The results of modelling using RBFN obtained Mean Square Error (MSE) of 7.86E-14 and this method is very well applied for diagnosis of three-phase electric motor isolation modelling caused unbalance voltage.
Enhancement of solar photovoltaic using maximum power point tracking based on hill climbing optimization algorithm
Authors: Ulinuha A , Zulfikri A 
Published: May 2020

Abstract
The voltage generated by solar photovoltaic depends on sunlight intensity. Since the direction of sunlight changes during a day, it causes changing of sunlight intensity leading to voltage reduction. To maintain the voltage, the panel must be directed so that it stays facing toward the sun to get maximum light intensity. The algorithm of Hill Climbing is employed to search the most optimal panel position that enables providing maximum voltage. This algorithm explores and saves the most optimal condition and updates it if new situation takes place. The algorithm is implemented in a Maximum Power Point Tracking (MPPT) system that continuously directs the panel to generate maximum voltage. An Arduino microcontroller is employed to interpret the algorithm that instructs DC Motor to set the most optimal panel position. A set of current and voltage sensors is used to measure and provide feedbacks to the controller. The system is implemented on a 50 WP solar panel that enables providing higher power compared with that without MPPT. Since the microcontroller and actuator also consume power, this should also be taken into account. Inclusion of this additional power still makes the system provide net power higher compared with that without MPPT.
Implementation of AES cryptography and twofish hybrid algorithms for cloud
Authors: Santoso K I , Muin M A , Mahmudi M A 
Published: May 2020

Abstract
Data exchange is an inevitable issue in this digital age. Especially data in a cloud system. The data must be secured so as not to be abused by people who are not entitled to. Algorithms to secure data is already widely known. It would be more secure if data security combines at least two algorithms for Cryptography. The goal is to strengthen the results of the data encryption in the case will be hacked, unauthorized people. This research will incorporate two Cryptographic Algorithms, namely AES (Advanced Encryption Standard) and Twofish with 256 bits key generated by the HASH function SHA 256. This new algorithm will give more security to the data uploaded or downloaded in the Cloud system.
Microwave heating as an alternative lifting method for the heavy oil deposits
Authors: Indriani E , Purnomosidi  
Published: May 2020

Abstract
In providing solution for lifting the viscous oil which is immensely concerned in mature field, thermal recovery is commonly applied to recover the oil with API gravities approximately 20 0API by using steam injection and in situ combustion. It had been the way out to lower enough the viscosity so that the oil would flow toward more effortless than the viscous one for the recent times. Applying electromagnetic microwave to heat up the reservoir can overcome the depth limitation which is often found in conventional thermal recovery methods. This method uses the Nano-ferro fluid as a stimulant that conveniently radiate heat in a reservoir. It is important to analyse the brine formation in affecting the optimization of thermal period while the Nano-ferro fluid being directly introduced to formation fluid. Therefore, NaCl solution becomes variable which was used to represent brine formation in investigating the heating time of saturated artificial cores. Meanwhile optimal concentration of Nano-ferro had been recognized. The microwave was also varied in sequence of power, 378-Watt, 468-Watt, 657-Watt, 792 Watt, and 900 Watt. For example, applying 50,000 ppm, 100,000 ppm, and 350,000 ppm in performing investigation that would give significant performance while thermal process. When 657 Watt was set to heat up the compartment contained artificial core, the temperature could reach up to 90 °C in 110 seconds, 82 seconds, and 54 seconds consecutively from low to high NaCl solution. In that way, the sensitivity of this variable was proved that NaCl solution greatly affect the temperature increment in times. Furthermore, this research can be considerable study in finding out the behaviour of formation fluid which contribute in optimizing for Nano-ferro fluid thermal recovery.
Dynamics of fluctuations in the Gaussian model with dissipative Langevin Dynamics
Authors: Corberi F , Mazzarisi O , Gambassi A 
Published: May 2020

Abstract
We study the dynamics of the fluctuations of the variance s of the order parameter of the Gaussian model, following a temperature quench of the thermal bath. At each time t, there is a critical value s

c
(t) of s such that fluctuations with s > sc

(t) are realized by condensed configurations of the systems, i.e., a single degree of freedom contributes macroscopically to s. This phenomenon, which is closely related to the usual condensation occurring on average quantities, is usually referred to as condensation of fluctuations. We show that the probability of fluctuations with s < inft[sc

(t)], associated to configurations that never condense, after the quench converges rapidly and in an adiabatic way towards the new equilibrium value. The probability of fluctuations with s > inft[sc

(t)], instead, displays a slow and more complex behavior, because the macroscopic population of the condensing degree of freedom is involved.

A post-publication change was made to this article on 4 Jun 2020 to correct the title on the webpage.
Opto-Electronic properties of BN-ring insertions in Circumacenes: the case of Coronene and Ovalene
Authors: Mocci P , Cardia R , Bosin A , Cappellini G 
Published: May 2020

Abstract
We report a comparative computational analysis on the electronic and optical properties of some emblematic carbonaceous planar molecules after BN substitutions. In particular, we focused on Coronene (C24H12) and Ovalene (C32H14) molecules (belonging to the Circumacenes family) after different hexagonal-Boron-Nitride-ring insertions. We have performed all-electrons Density Functional Theory and Time Dependent DFT calculations using a localized Gaussian basis-set combined with the hybrid exchange-correlation functional B3LYP. For all the systems, we calculate the main molecular electronic and optical properties and we discuss if the mixed C-BN-ring-substituted clusters could be a potential attractive alternative or integration with respect to their C-made compounds, for both fundamental and application research.
Analysis in reciprocal space of the band-pass filter effect in uniform and non-uniform grating couplers
Authors: Zagaglia L , Floris F , Brien P O’ 
Published: May 2020

Abstract
A detailed study on the origin of the bandwidth reduction in the Coupling- Efficiency (CE) spectrum for non-uniform grating couplers (nu-GCs) due to a band-pass filter effect is reported. This effect is deeply investigated through Finite Difference Time Domain simulations (FDTD) in order to look at the spatial Fourier Transform (sFT) of the nu-GC’s emission, which gives the energies and the wavevectors sustained by the overall structure. We show: how to evaluate the bandwidth from the sFT and how the band-pass filter effect arises from the sFT affecting the CE spectrum giving a physical insight on the bandwidth’s reduction. Moreover, we also point out how the concept of photonic crystal bandstructure can be applied for such nu-GCs and used as a powerful tool to describe the dispersion of the light inside these non periodic structures. Finally, both the sFT and the bandstructure approaches are shown to give the same outcomes in terms of the bandwidth evaluation and to be in agreement with the CE spectra’s behaviours. The entire analysis is proposed also for uniform-GC in order to directly compare the two different types of structures.
The poor man’s magnetohydrodynamic (PMMHD) equations
Authors: Alberti T , Consolini G , Carbone V 
Published: May 2020

Abstract
We present a mathematical derivation of a discrete dynamical system by following a Fourier-Galerkin approximation of the 3-D incompressible magnetohydrodynamic (MHD) equations. In this way, a 6-D map, depending on 12 bifurcation parameters, is derived as a truncated set of nonlinear ordinary differential equations (ODEs) to characterize incompressible plasma dynamical behaviors, also conserving total energy and cross-helicity in the ideal MHD approximation. Moreover, three different subspaces, associated with long-living non-trivial solutions (e.g., fixed point solutions), have been found like the fluid, magnetic, and the Alfvenic fixed points. Our set can be seen as a Lorenz-like model to investigate MHD phenomena.
Spin-orbit interaction near the neutron drip line and shell effects at N = 82 near the r-process path
Authors: Alabbar A. N. , Sharma M. M. 
Published: May 2020

Abstract
We have studied the behavior of charge and neutron radii across the shell-closure at N = 82 near the neutron dripline in a comparative approach which includes Relativistic Mean Field (RMF) Theory and the nonrelativistic Skyrme-Hartree-Fock (SHF) Theory. We have investigated the extent and the effects of the spin-orbit interaction on the ground state properties of neutron-rich nuclei in the extreme region. RMF and SHF calculations have been performed for nuclei in the isotopic chains from Kr (Z = 36) to Sn (Z = 50) near the neutron dripline across the magic number N = 82. We present the results of shell-effects on charge radii, neutron radii, and the neutron skin thickness. We have examined the single particle energies (SPE) in the context of the kinks in the radii. It is shown that RMF theory produces a kink in charge radii, similar to what was seen experimentally for Pb (Z = 82) isotopic chains. This is in contrast to the Skyrme forces, which do not produce such a kink.
Consistent analysis of deuteron interactions at low and medium energies
Authors: Avrigeanu M. , Avrigeanu V. 
Published: May 2020

Abstract
An extended discussion of the deuteron-induced reactions concerning full parametrization procedure as well as consideration of the theoretical models associated to the deuteron interaction process is carried out. The key role of direct interactions, i.e., breakup, stripping and pick-up processes is stressed out by comparison of the available experimental data with theoretical and evaluation predictions.
Triaxiality-related nuclear phenomena in the A ≈ 100 mass region
Authors: Timár J. , Kruzsicz B. , Kuti I. , Sohler D. , Molnár J. , Nyakó B. M. , Chen Q.B. , Zhang S.Q. , Meng J. , Joshi P. , Wadsworth R. , Starosta K. , Koike T. 
Published: May 2020

Abstract
Solid experimental evidence for triaxial nuclear shape is difficult to obtain and is quite rare. Such evidence can be provided by the phenomena of chiral rotation and wobbling motion, as these can occur only in triaxially deformed nuclei. Although nuclear chirality is well documented in different mass regions, experimental evidence for multiple chiral bands as well as for wobbling motion has been reported so far only in a few nuclei. Pd and Rh nuclei in the A ≈ 100 mass region have been recently studied, and transverse wobbling motion as well as multiple chiral band structures were identified for the first time in this region. These observations provide experimental evidence for the predicted triaxial shape in this mass region, and new data which enable a better understanding of the studied phenomena.
Neutron transfer in reaction 18O + 181Ta with formation of neutron-rich oxygen isotopes
Authors: Penionzhkevich Yu E , Lukyanov S M , Azhibekov A K , Naumenko M A , Issatayev T , Kolesov I V , Maslov V A , Mendibayev K , Zernyshkin V A , Kuterbekov K A , Mukhambetzhan A M 
Published: May 2020

Abstract
Differential cross sections for the formation of oxygen isotopes in the reaction 18O + 181Ta have been measured at projectile nucleus energy 10 A⋅MeV on the high-resolution magnetic spectrometer MAVR. Theoretical analysis of product yields has been performed in the finite-range distorted-wave Born approximation formalism using the FRESCO code under the assumption of sequential neutron transfer mechanism. The results of calculations are in good agreement with experimental data.