bluuebunny/crossref_metadata_2025_split huggingface dataset:
Finite element analysis on the quartz plate due to the placement of quartz crystal microbalance on printed circuit board
Authors: Kusuma F J , Zafirah T N , Abdurrouf  , Sakti S P 
Published: March 2021

Abstract
Quartz Crystal Microbalance (QCM) is a high sensitivity piezoelectric sensor that enables it to detect loads in the nanogram order. QCM usually consists of a thin quartz plate with an AT-cut orientation. The sensor resonance frequency and its stability are affected by the sensor parameter and its placement in the reaction cell. Previous studies have shown that the physical parameters and geometric shapes of the QCM sensor greatly affected the sensitivity and stability of the sensor. As the sensor is thin, only in the order of hundredths micrometer, pressure, or force on top of the sensor surface also affects the sensor resonance frequency. In this study, we conducted a deformation analysis due to the placement of QCM on the Printed Circuit Board (PCB). The simulation is done by Finite Element Method using ANSYS 19.2. Variations in the shape of the electrodes on the PCB and O-ring elastic modulus that used in the QCM system has been investigated O-rings that have a smaller elastic modulus that will cause greater deformation. From the two types of PCB electrodes, electrodes in the form of ¾ circular arcs give smaller deformations than electrodes in the form of ½ circular arcs. The deformation occurs in the order of 10−6 m.
A design of short distance PM2.5 monitoring system using a bluetooth module
Authors: Wardoyo A Y P , Pratama C K , Dharmawan H A , Nurhuda M , Adi E T P 
Published: March 2021

Abstract
This paper presents a design of a PM2 5 monitoring system based on the Samyoung sensor type DSM501A with the HC-05 Bluetooth data communication module. The sensor is integrated into an Arduino Nano. The measured data are not only displayed on an LCD but also are sent to a computer using a Bluetooth module for the storage. The data are stored in the excel data format and viewed by using the PLX-DAQ add-on. The system was calibrated by using a standard PM25 measurement device (Kanomax dust monitor type 3443). The calibration procedure was conducted by measuring the PM2 5 concentration of the sources. The performance of the system is presented in the optimum communication distance, the concentration range, and the system sensitivity. The result shows that the system works well. The optimum distance between the system and the computer is in the range up to 16 m. The sensitivity of the system is found of 600 μg/m3/minute with the range of the concentration measurement up to 1400 μg/m3 at the room temperature and humidity.
Analyses of Concentration and Wavelength Dependent Refractive Index of Sugar Solution Using Sellmeier Equation
Authors: Misto  , Purwandari Endhah , Supriyadi  , Arkundato Artoto , Rohman Lutfi , Eko Cahyono Bowo 
Published: March 2021

Abstract
The concentration and wavelength-dependent refractive index of sugar solution have been determined using Sellmeier Equation. The equations describe the refractive index as a function of wavelength parameter. They could be generalized as a function of material concentration by investigating the characteristic of their Sellmeier constants A and B. The three wavelengths used to identify the refractive index of sugar solutions were 455 nm, 525 nm, and 633 nm, while the concentration of the sugar solution ranged from 0 to 40%. This paper reported in this research performed the empirical expression of concentration-dependent of the sugar solution. The A and B Sellmeier constants were the main subjects to be concerned. A constant has a linear relationship with the sugar solution at 15% concentration to 40%. Under a concentration of 15%, the refractive index is quadratic towards engagement. The sellmeier B constant has a quadratic relation characteristic below the attention of 15%. Above 15%, the constant B and concentration of sugar solution were associated with the 4th order polynomial equation.
Effects of Co-60 gamma irradiation on the surface morphology and magnetic properties in thin film permalloy Ni80Fe20 for magnetic sensor
Authors: Ismail  , Priyantoro D , Oktaria V , Purnama B 
Published: March 2021

Abstract
The thin film of permalloy Ni80Fe20 were synthesized by electro-deposition method on PCB substrate. Then the sample irradiated by using Co-60 gamma for 20 Gy and 30 Gy. The sample were investigated by scanning electron microscopy and vibrating sample magnetometer, before and after gamma irradiation process by Co-60 gamma irradiation. The decrease in grain size with the increase of radiation dose is observed. The hysteresis curve also showed an increase in saturation magnetization with the increase of radiation dose from 708 emu/cc to 920 emu/cc. The investigation results indicate that the modification of the surface-microstructure samples by gamma irradiation change a magnetic properties in thin film permalloy Ni80Fe20.
Study of doxorubicin release on apoferritin-magnetic-doxorubicin nanoparticle
Authors: Prasetya A D , Sulungbudi G T , Wildan Z L , Mujamilah  
Published: March 2021

Abstract
Conjugation of nanoparticle with some substance can be a solution to a theragnostic of cancer cells. The release of doxorubicin from conjugated apoferritin-magnetic-doxorubicin (APO-NPM-DOX) was studied in different pH conditions and incubation time. The preparation of magnetic nanoparticle (Fe3O4) was done through the co-precipitation method using FeCl3 and FeCl2 (mol ratio 1:1) as the precursor. The encapsulation process was started by conjugation of magnetic nanoparticle with doxorubicin, then followed by incubation of the mixture in apoferritin solution for 2 hours in pH 3. The mixture was then set to pH 8 using NaOH and dialyzed in Tris-HCl. The doxorubicin release from APO-NPM-DOX was studied by incubation at 36.5 °C in different time variations in pH 5 and different pH conditions (4, 5, 6, 7) for a week. The doxorubicin release trend becomes steady after three days of incubation in pH 5 with 4.6% of the doxorubicin had been released. The highest percentage of doxorubicin release was found in pH 4, which is more than 1.2 times higher than in pH 5.
Effect of pH condition during sol-gel synthesis on the volume fraction of hydroxyapatite from sea coral
Authors: Siswanto  , Sormin D P , Hikmawati D , Aminatun  , Apsari R 
Published: March 2021

Abstract
A research Hydroxyapatite synthesis has been carried out using the sol-gel method with variations in acidity (pH). Hydroxyapatite sources are obtained from marine corals from Banyuwangi. Hydroxyapatite synthesis is carried out by reacting calcium hydroxide Ca(OH)2 obtained from the powder coral with phosphoric acid (H3PO4) using the sol-gel method. synthesis is carried out with a pH variation from values 5 to 13 at intervals of 2 and is characterized using XRD (X-Ray Diffractometer). The XRD results show that for hydroxyapatite synthesis using the sol gel method the most optimal pH value is 11 with a volume fraction of 92.7% and the impurities are Lime CaO and Portlandite Ca(OH)2.
Improving of shaft steel materials properties using ion nitriding
Authors: Sujitno T , Suprapto  , Mulyani E , Andriyanti W 
Published: March 2021

Abstract
During operation, shaft steel always contacts with other components, so this material will erode gradually and will be accelerated if this component used in corrosive environment. Finally, the performance of the components to be worse. To improve the quality of the surface components, an ion nitriding technique can be applied. In this research, ion nitriding process was carried out at 300°C, 350°C, 400°C, 450°C and 1.6 mbar for 4 hours. It can be concluded that generally by increasing the temperature, the hardness increases and at 450°C reached the highest value in order of 297.86 VHN, while the hardness of raw materials is 98.66 VHN or increases by factors 3, the wear decreases from 60.3 × 10−9 mm2/kg to 26.8 × 10−9 mm2/kg or there is an increasing in wear resistance by factor 2.25, and corrosion rate decreases from 4.2465 mpy to 0.6748 mpy.From XRD analysis, it is observed the formed phase are Fe2N and Fe3N. The formation of new phase contributes in improving of hardness, wear, and corrosion resistance.
The dynamics of polarization and magnetization: Susceptibilities of magnetoelectric multiferroic heterostructure
Authors: Gunawan V , Subagio A , Umiati N A K 
Published: March 2021

Abstract
The dynamic susceptibility is the crucial parameter of a material, especially when the material is needed to be applied in the electromagnetic applications. In this report, we discuss the magnetic and the electric susceptibilities of a magnetoelectric (ME) multiferroic heterostructure comprised of ferromagnetic (FM) and ferroelectric (FE) materials. Since the magnetoelectric couplings in multiferroic heterostructure have only existed at the interface between FM and FE, then the equation of motions in each lattice in every layer of FM and FE should be considered. The equations of motion in each lattice are solved simultaneously by employing entire-cell effective medium approximation. In numerical calculation, the parameters appropriate for Fe and BaTiO3 are used. We found that interfacial ME couplings shift down the resonance frequency for both FM and FE susceptibilities. We also noticed that the addition of the number of FE or FM layer, which raises the number of interface between FE and FM affects the susceptibility curves.
Bovine serum albumin refolding at acid solution by small angle neutron scattering
Authors: Patriati A , Suparno N , Putra E G R 
Published: March 2021

Abstract
A series of study of the conformational change of bovine serum albumin (BSA) induced by pH and additive has been conducted by small angle scattering (SANS) technique. The unfolding process occur by increasing the solvent acidity of the buffer. The previous work from SANS scattering profile shows that BSA unfolded into a cylinder-like structure at pH 2. In this work, the role of sorbitol in refolding process of BSA in acid solution was studied. Sorbitol, at concentrations from 0 to 3 M, led to the progressive restoration of BSA globular structure. The SANS scattering data show the conformational change from cylinder-like structure of pure BSA at pH 2 undergo to ellipsoid-like structure in the addition of 3M sorbitol. In the absence, 1M and 2M sorbitol, the SANS scattering profile of BSA fitted to flexible cylinder model. Meanwhile in the present of 3M sorbitol, it fitted to triaxial ellipsoid model. These results are confirmed with ab initio low-resolution shape calculation model analysis using GNOM and DAMMIN obtaining the three-dimensional structure model.
Concentration effect on optical properties of CDots composite film from sugar (sucrose)
Authors: Rahmawati F , Isnaeni  , Lewa I W L , Iriani Y 
Published: March 2021

Abstract
Carbon dots (CDots) are one of the fascinated carbon-based nanomaterials which have broad applications. One fields that rarely been explored is using Cdots as a composite luminescence film with addition of polyvinyl alcohol (PVA). The luminescence properties of Cdots is a great potential that can be used to make luminescence PVA/CDots films since CDots are known as materials that have strong luminescence. This study aims to determine the effect of CDots concentration on the optical properties of Cdots/PVA composite. We also observed the effect of excitation wavelengths to emission of CDots/PVA composite. The carbon dots was synthesized from commercial sugar using microwave technique. UV-Vis spectroscopy characterization showed that the concentration of CDots affect to surface state of CDots. Surface energy bands from individual CDots may overlap one to another creating new energy level, so that the absorbance peak experiences red shift. Photoluminescence spectra results showed that the excitation wavelength caused a difference in the emission wavelength in the sample. Excitation with a blue laser produces green emissions while excitation with a green laser produces red emissions. The results show that the synthesized Cdots have potential to be used as luminescence films. The as-synthesized Cdots shows great luminescence properties and can be varied with several controlled parameters.
Synthesis of fluorescent composite films PVA/CDots from orange concentrate with microwave technique
Authors: Jannah R , Isnaeni  , Lewa I W L , Iriani Y 
Published: March 2021

Abstract
Carbon dots (CDots) is one of the fluorescent materials that can be made of organic materials. CDots materials can be obtained easily using organic materials that have carbon chain. Synthesis of CDots with orange concentrate as a PVA/CDots composite film using microwave was carried out and the optical properties of synthesized CDots with various concentrations of orange concentrate were observed using excitation wavelength variations by observing emissions of CDots. The successful synthesis of CDots could be recognized by simply irradiating a 405 nm UV laser into a sample and then further characterization using a UV-Vis spectrophotometer and photoluminescence were conducted. The results of UV-Vis characterization showed the effect of concentration variation on the the absorbance peak wavelength. For high concentration, the absorbance peak wavelength is longer than that of low concentration. This is due to the surface state CDots. The characterization of photoluminescence shows CDots emissions. Excitation using a blue laser (1=420 run) produces emission peaks that is in the range of green wavelengths, whereas excitation using green laser (1=532 nm) produces emission peaks that are in the range of yellow-red wavelengths. The results of the synthesized PVA/CDots films from orange concentrates have good potential to be applied as glowing packaging.
XRD study of ceria stabilized zirconia (CSZ) microsphere synthesized by external gelation
Authors: Insani A , Mujamilah  , Rifai M , Prasetya A D , Sarjono  
Published: March 2021

Abstract
Ceria stabilized zirconia microsphere has been synthesized by external gelation. XRD investigations were carried out at each thermal treatment to study the process of zirconia oxide formation. The diffraction patterns at thermal treatment 60°C, 120°C and 200°C still appeared to be broadening because there were still amorphous hydrocarbon compounds. The peak of diffraction started to look at 400°C although it was always broadening, this was because the oxide has begun to form but has not crystallized. Perfect crystallization appears on heat treatment at 1200°C as the tetragonal ZrO2 phase.
OH Radical Intensity of Dielectric Barrier Discharge (DBD) Plasma Measured by Optical Emission Spectroscopy (OES)
Authors: Qusnudin A. , Kusumandari K. , Saraswati T.E. 
Published: March 2021

Abstract
This study aims to identify the intensity of the OH radical emission spectrum of dielectric barrier discharge (DBD) plasma. The OH radical emission spectrum was measured using Optical Emission Spectroscopy (OES) Ocean Optic Maya Pro 2000. Characterization of current as voltage function is done by providing a high-voltage AC source to the DBD reactor with variations of 1-10 kV. The results of the characterization show that the current increase with voltage. The OES measurement of DBD plasma was carried out at a voltage of 10 kV. As a result, the OH radical emission in DBD plasma was observed at a wavelength of 313.54 nm. The smallest intensity was 4678.5 counts obtained at 2.4 s. While the greatest intensity was 13644.67 counts obtained at 44.6 s.
Verdet constant of various types of honey and sugar solution analyzed at different concentration
Authors: Purwandari E , Misto  , Hidayat R , Supriyadi  , Cahyono B E 
Published: March 2021

Abstract
The optical activity effect of material on the polarization of a light beam due to the external magnetic field has observed through Faraday rotation. The use of the Verdet constant represents the behaviour characteristic of the material. This paper had reported the Verdet constant of some honey types compared with a sugar solution that was analyzed at different concentrations. Laser He-Ne had been used to observe the change of its polarization angle (Faraday rotation) when the external magnetic field applied at 50 gauss, 100 gauss, and 150 gauss. They were produced by a solenoid wrapped around the sample container, connected to the DC power supply. The Verdet constants of Kaliandra honey, Randhu honey, and Pahit honey, respectively, indicate their dependence on concentration. The profile of concentration dependence of the Verdet constant for all three types of honey is the same as that of the sugar solution. However, the highest Verdet constant is achieved by Kaliandra honey when analysed at a concentration of 30%.
Fluorescence polarization method for detection of lard mixed with olive oil
Authors: Salsabila A , Azam M , Sugito H , Soesanto Q M B , Firdausi K S 
Published: March 2021

Abstract
This study is based on fluorescence polarization as a potential alternative method for an investigation of contamination of lard in food. The purpose of this study was to obtain the characteristic of fluorescence polarization in olive oil samples mixed with lard. The characteristics of fluorescence polarization were obtained by measuring changes in the polarization of light using a linearly polarized green laser pointer and observed in the direction of the scattering angle of 90˚ for various direction of electric field of the laser. The results showed that the critical angle of direction of electric field of the laser and the average polarization change increase as the concentration of lard is raised. It could be due by additional asymmetric triglycerides and molecular orientation that play an important role in the sample. This result shows that additional mixture of lard in olive oil can be detected, and this method seems to be developed for the detection of low concentrations of lard contamination.
Estimations of fluorine-18 production yields from 13-MeV proton bombardment of enriched water target
Authors: Kambali I 
Published: March 2021

Abstract
Fluorine-18 (18F) is a positron emitter frequently used in Positron Emission Tomography (PET) to assist in the staging of primary tumors, Recent research suggests that the positron emitting radionuclide can also be applied for pneumonia imaging caused by Covid-19 infection. In this work, a 13-MeV proton beam was theoretically bombarded to 99.5% enriched water (H2
18O) target to produce 18F radionuclide via (p, n) nuclear reaction. The CalcuYield code was used in the predictions of the F-18 production yields. Using the CalcuYield code, the 18F radioactivity yields were calculated at the end of bombardment (EOB) at various proton beam currents, irradiation time and proton beam doses. Based on the CalcuYield calculated results, the maximum EOB yield of 18F at 13 MeV proton energy was 60.073 mCi/µAh. At a proton dose of 60 µAh, the EOB yield could be achieved as high as 3784.393 mCi, which could be used to diagnose more than 500 patients. The calculations also found that for the same proton dose, increasing proton beam current would result in greater 18F radioactivity yield than increasing irradiation time. In addition, radionuclide impurities which could predictably be present in the target were mostly due to nuclear reactions between proton beam and havar window. The predicted radionuclide impurities include 96Tc, 55Fe, 59Ni, 56Co, 52Mn, 186Re and 58Cu which were due to (p, n) nuclear reactions. The total radionuclide impurity yield was found to be 0.793 mCi/µAh. Among the other impurities, 58Cu was expected to have the highest radioactivity yield at all irradiation parameters. These predicted results could be used as a reference for future 18F radionuclide production should a 13-MeV proton beam is employed.
Conceptual design of magnetic field mapping in polar coordinate for DECY 13 cyclotron
Authors: Kudus I A , Wibowo K , Wahyono P I , Diah F I , Mulyani E , Taufik  
Published: March 2021

Abstract
Center for Accelerator Science and Technology (CAST) BATAN conducting a project on design and construction of 13 MeV proton cyclotron (DECY-13), which eventually will be used for radioisotope production. This cyclotron has several main components, one of them is a magnetic system that has been installed at the end of 2014. In the initial stage, magnetic field mapping was carried out with a mechanical structure in the x and y directions (Cartesian coordinate) using 2 hall probes. However, the results achieved have not been able to show the distribution of magnetic fields in accordance with the design specifications because the energy of beam path less than 3 MeV. The new mapping system was proposed for the DECY-13 magnet, using a hall probe that mechanically moves in angular and radial steps which are 1 degree and 5 mm, respectively. Based on the calculation, the mapping process required about 9 hours for 34,560 data, this number of data is 17% higher than the previous mapping system. Instrumentation of this system has 0.1 Gauss of error and 0.01 Gauss of resolution. The radial mapping provides better accuracy and more compatible with a further magnetic field analysis than the Cartesian.
Application of liquid organic fertilizers from market waste on the growth and nitrogen uptake of oil palm seedlings
Authors: Hastuti P B 
Published: March 2021

Abstract
The purpose of this study was to determine the effect of various concentrations of liquid organic fertilizer from market waste on the growth and N uptake of oil palm leaves seedlings in pre-nursery. This experiment used a completely randomized design with ten replications. There were eight treatments namely 15%, 25%, 35%, 45%, 55%, 65%, chemical fertilizer (NPKMg and urea) as control and solid compost. The results showed that the application of liquid organic fertilizer at concentrations of 35% to 45% and solid compost gave the highest stem diameter and N uptake of oil palm leaves. The application of liquid organic fertilizer from a concentration of 25% to 45% and solid compost gives the highest dry weight and leaves of oil palm seedlings. Application of liquid organic fertilizer with a concentration of 45% to 65%, solid compost, or chemical fertilizer produces the highest amount of chlorophyll.
Theoretical analysis of the optimization of power transfer from half loop source in a simple cavity
Authors: Shali A H 
Published: March 2021

Abstract
A model that illustrate the optimal placement of coupler inside an RF cavity is proposed. The chosen geometry of the cavity are rectangular and cylindrical cavity. A small half loop of localized current source which acts as a coupler is placed on the side of the cavity. The half loop is then rotated along an axis perpendicular to the side of the cavity. An angle which gives maximum transferred power for both cavities is then sought. The result is then compared between cavities, which is then used to estimate the optimized configuration of a half loop coupler inside an RF cavity.
Modeling of x-ray attenuation on SS316 metal foam shielding using MCNPX
Authors: Hidayanto E , Budi W S , Arianto F 
Published: March 2021

Abstract
The use of lead plates as shielding to X-ray radiation has the disadvantages of being heavier and not environmentally friendly when compared to other materials. Currently, metal foam technology is developed that is expected to be close to the ability of lead plate as a radiation shielding that is lighter and environmentally friendly. This research was conducted by modeling SS316 stainless steel plates and foams for the thickness of 5-40 mm, the diameter of 2, 3, and 4 mm at an energy of 0.1, 0.662, and 1 MeV. The metal plate and foam modeling were carried out using the program of Monte Carlo N-Particle eXtended (MCNPX). Calculation of X-ray attenuation from the modeling results shows that SS316 stainless steel performance both in the form of plates and metal foams is almost equivalent to pure lead. From these results, it can be concluded that metal foam technology is expected to be a lighter and environmentally friendly lead-in radiation retaining material.