bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study behavior of Geneva mechanism using 3D printing technology
Authors: Rizescu D , Besnea D , Rizescu C I , Moraru E 
Published: June 2019

Abstract
The authors developed a study for behaviour of Geneva mechanism considering different materials and technologies. Generally, there are three basic types of Geneva motion mechanisms named external, internal and spherical. In this paper the authors considered external Geneva mechanism. The design and machining of a conventional Geneva mechanism are generally well known, but there are some particularities, if we consider 3D printing technologies. Conventional, Geneva mechanisms are used to low-speed applications, or to those in which noise and vibration are of no importance. Using PLA+Copper or ABS materials noise and vibrations are reduced considerably. Also, the entire mechanism has a reduced weight. There were considered different fill factors for 3D printed parts. The experimental setup allows fast changing of mechanism parts. This research aims the study of behaviour of 3D Printed machine elements like: springs, bearings, clutches gears, bellows, diaphragms, bushes, brakes, sliders, etc developed by authors.
Research concerning the achievement of eco-innovation virtual hub tools to increase Romanian economic environment competitiveness
Authors: Radulescu I 
Published: June 2019

Abstract
The paper presents the virtual hub experimental model achievement consisting of an innovative tools series in order to facilitate innovation, knowledge transfer and waste recycling efficiency of electrical and electronic equipment.
The Hub includes a tools set to increase recycling efficiency: the passport for electrical and electronic products recycling, the multi-criteria analysis method for the product, pointing relevant features for recycling, the implementation model of eco-innovative technologies at company level, the recyclability evaluation method based on idealism. It also includes an eco-innovation library, an eco-innovation and training laboratory, a Forum, as well as User Guides for each tool and a cost-benefit analysis guide for e-waste recycling.
The obtained tools, in their form, are an absolute novelty in the field of WEEE recycling and they address a new way of thinking and a new philosophy about material recovery and recycling and resource economy.
The components and vectors of excellence
Authors: Puiu C , Puiu V 
Published: June 2019

Abstract
This work aims at identifying the components of excellence (market, products / service, development) through a new contextual approach. An interdisciplinary scientific instrumentation is utilized, by placing, into the space of the vector theory in physics, the economical sizes that, by summing, can provide a real quantification (concrete, precise) of the excellence in business. The work proposes a new quantification modality of the excellence level through the method of vectorial composition, taken over from physics (mechanics). After the components of excellence (market, product / service, development) have been established and represented as vectors, the calculation of the resulting vector (excellence) can be done, through the classical vectorial composition, into a system of axes, determined by the excellence components.
Assisted quality inspection for hip prostheses components
Authors: Braun B C 
Published: June 2019

Abstract
In the paper is presented a new method for quality analysis of some hip prosthetic elements, surface quality standpoint. First of all it is about the head, as spherical joint for the hip prosthesis. For best bio-compatibility is absolutely necessary that its surface to be well processed standpoint roughness, for lowest friction forces, as much as possible those in the case of the natural hip joint. For this reason, within our current research activities, we have developed a virtual instrument, as software interface for efficient assisted roughness deviations for spherical joints of the hip prostheses, reported to a reference hip prosthesis. This application could be very practical and useful for the stage of adjustment and grinding prostheses heads, increasing the productivity and reducing the number of scraps cases in production
Method to model the spinal column shape
Authors: Vutan A M , Gruescu C M , Lovasz E C , Ciupe V 
Published: June 2019

Abstract
Correct evaluation of the spine is important in detecting the deficiencies that may occur at this level, especially in case of scoliosis. It is proposed a new method of acquiring the coordinates of the column in order to generate a model of it. A number of eight coordinates has been chosen to use, a big enough number to assure a true model of the spine and a wide area of possible mathematical approaches. The acquiring system consists of eight accelerometers, from which is collected the pitch angle. This angle, as the angle of inclination in the frontal plan is used to compute the pairs (x, y), considering known the distance between the sensors. The accuracy of the model is validated by comparison with images taken during the measurement.
Printed Low-Cost Microfluidic Paper-based Analytical Devices for Quantitative Detection of Vitamin C in Fruits
Authors: Andini  , Andayani Ulfa , Anneke  , Sari Meiria Istiana , Sabarudin Akhmad 
Published: June 2019

Abstract
Microfluidic paper-based analytical device has been fabricated and subsequently applied to determine the Vitamin C level of the non-seasonal fruit i.e pineapples, oranges, guavas, and apples in Indonesia. µPAD was prepared by creating a hydrophobic barrier on Whatman Chromatography paper No. 1 in a certain pattern printed using Xerox Colorcube 8580 DN-2. 0.05 µl of 2,6-Dichlorophenolindophenol was dispersed into a detection area on the µPAD devices prior to the addition of 0.2 µl of fruits juice samples. The barrier allowed the fruits juice to flow and alter the color of the reagents through a redox reaction. Vitamin C in fruit juice altered the color of 2.6-Dichlorophenolindophenol reagent into a pinkish color. The changing of the reagent color was then processed using Image J software to determine the RGB intensity level. The results showed that the average amounts of Vitamin C in pineapples, oranges, guavas, and apples are 0.05%, 0.05%, 0.08%, and 0.04% respectively.
Comparing between mGCV and aGCV Methods to Choose The Optimal Knot Points in Semiparametric Regression with Spline Truncated Using Longitudinal Data
Authors: Damaliana Aviolla Terza , Nyoman Budiantara I , Ratnasari Vita 
Published: June 2019

AbstractSemiparametric regression is a combination of parametric and nonparametric components. The estimation of the semiparametric regression function uses a parametric approach and a nonparametric approach. This study uses longitudinal data. The estimation technique in this study uses Spline truncated which has very special, excellent statistical interpretation and visual interpretation. The estimation technique in longitudinal semiparametric regression uses the weighted least square (WLS). The choice of knots in semiparametric spline truncated regression is very important because the number of knot points and locations of each knot will affect the regression estimation form. The method of selecting knots in this study uses a Modification of Generalized Cross-Validation (mGCV) and aGCV. This study uses cases of life expectancy in East Java Province 2001-2015. Comparison of the two methods based on the R-square value and the value of Mean Square Error (MSE). The results show that the R-square value of mGCV is greater than aGCV and the MSE value of mGCV is smaller than aGCV. So, it can be concluded that the mGCV method is better than the aGCV method for optimal selection of knot points in the case of life expectancy in East Java Province.
Fuzzy Logic Application as A Tool for Classifying Water Quality Status in Gajahwong River, Yogyakarta, Indonesia
Authors: Dewanti Novita Ayu , Abadi Agus Maman 
Published: June 2019

Abstract
The growth of manufacturing and waste disposal in the Gajahwong River watershed has resulted in decreasing river water quality. Therefore this study aims to develop a fuzzy logic system in classifying water quality status in Gajahwong River. There are 11 parameters used for classifying water quality status, namely temperature, potential hydrogen (pH), dissolved oxygen (DO), biological oxygen demand (BOD), chemical oxygen demand (COD), free chlorine, nitrate, nitrite, oil and fat, lead and Escherichia coli (E. Coli). These parameters are used to assess the Gajahwong River water quality at three different stations during the period of 2007 to 2017. The application process of fuzzy logic begins with the use of 11 parameters consisting of physical, chemical and biological parameters as input, with the Mamdani method as the fuzzy inference system. The output of this application is in the form of water quality status which is categorized as normal (N), lightly polluted (LP), moderately polluted (MP) and heavily polluted (HP). The classification is expected to facilitate the public in reading information about the quality of river water from the environmental agencies D.I. Yogyakarta, thus, the public can be aware of maintaining watersheds.
Acquisition of Voltage and Current Signals using A Single Board Computer for Online Monitoring of Powers
Authors: Dharmawan Hari Arief , Wardoyo Arinto Yudi P. , Widodo Chomsin S. 
Published: June 2019

Abstract
During this time, Single Board Computers (SBCs) are widely used in monitoring and control applications. Many relatively low-cost SBCs are available. This paper explains the implementation of an SBC LattePanda for online monitoring of powers through Local Area Networks (LANs). The SBC was used as the main part of the monitoring system that mainly performed acquisition of voltage and current signals sent by some sensors. A program for the microcontroller on the SBC was written for the acquisition processes. Furthermore, a client/server application was developed using Delphi to perform online monitoring of the signals. Some experimentation was performed to mainly ensure that the microcontroller could capture the voltage and current signals with precise and constant sampling timing as well as send the data to the client/server application successfully. A PicoScope was utilized during the experimentation to gain the timing information performed by the microcontroller. For calibration of the voltage and current, a 4.5-digit digital multimeter was implemented. The final stage of the experimentation revealed that the intended signals could be sampled with a constant timing and in this case 128 samples per channel was chosen. The developed application could also show the expected parameters including the signal of powers using an additional remote computers connected to the LAN.
Theoretical study on the corrosion inhibition performance of dibenzo-18-crown-6 and its derivatives
Authors: Hadisaputra Saprizal , Purwoko Agus Abhi , Rahmawati  , Hamdiani Saprini , Prananto Yuniar Ponco , Nuryono  
Published: June 2019

Abstract
Theoretical studies on the performance of corrosion inhibition of dibenzo-18-crown-6 compounds and its derivatives have been carried out using the B3LYP/631G(d) theory level. The effect of electron donor groups (NH2, OCH3, OH, CH3, CHCH2) and electron withdrawing groups (COOCH3, COOH, CHO, F, NO2) was also studied in the gas and aqueous medium. Electron donor groups increase the value of corrosion inhibition efficiencies; in contrast electron withdrawing groups have the opposite effects. The theoretical calculation indicated that NH2 gave the highest efficiency value, whereas the NO2 group gave the lowest corrosion inhibitor efficiency value. The positive correlation was shown between the corrosion inhibition efficiency and the quantum parameters. The Fukui function showed that the delocalisation of electrons around the benzene ring was the area that most contributes to the bond formed between the metal and the crown ether.
Identification of Bioactive Compounds in Ginger Based on Molecularly Imprinted Polymer Quartz Crystal Microbalance Gas Sensor
Authors: Hardoyono Fajar , Windhani Kikin , Sambodo Herman , Pudjianto Hary 
Published: June 2019

Abstract
Borneol, citral, and geraniol have been investigated as the major bioactive compound commonly found in ginger. In this work, a molecularly imprinted polymer (MIP) coated quartz crystal microbalance (QCM) sensor array has been employed for selective recognition of bioactive compounds in the ginger essential oil. In the experiment, the concentration of these bioactive compounds previously was measured using solid phase micro extraction gas chromatography-mass spectroscopy (SPME-GC/MS). Design of MIPs as the template of target molecules was created using polyacrylic acid (PAA) polymer matrix and three molecular targets (borneol, citral, and geraniol). An array of QCM sensor was prepared using four 9-Mhz AT-cut quartz crystal embedded between vacuum-deposited Au electrodes. For data recording, the headspace system flew the odorant of three varieties of ginger essential oil as positive control odorant and wild ginger essential oil as negative control odorant into the QCM sensor chamber. Then, mass loading in the MIP films caused frequency change of QCM sensor array due to odorant adsorption in a thin layer of MIP. Principal component analysis (PCA) and linear discriminant analysis (LDA) were applied to analyse the QCM response sensor. PCA score plot showed segregation of feature response of ginger essential oil with and without the molecular target in the coordinate of principal components. Meanwhile, LDA was able to discriminate training datasets of 80 ginger samples containing borneol, citral, and borneol with accuracy more than 92.50%.
Parameter estimation for porang (Amorphophallus muelleri Blume) chips milling by using a batch type of ball mills
Authors: Hermanto M B , Widjanarko S B , Suprapto Wahyono , Suryanto Agus 
Published: June 2019

Abstract
Porang bulbs (Amorphophallus muelleri Blume) are native Indonesian bulbs which have high glucomannan content. It is almost similar to konjac bulbs (Amorphophallus konjac) which also glucomannan source. Porang flour is made from dried porang chips with about 10 % wet based water content. Unfortunately, there are no studies which were focused on the underlying mechanism of porang chip milling by using a batch type of ball mills. The objective of this research is to determine optimal milling rotational velocity and milling parameters of the kinetic model of porang chip milling by using ball mills. A batch type of ball mills was occupied in this research for milling 1.5 kg of dried porang chips. Optimal rotational velocity was calculated in order to have an optimal performance of milling. Kinetic model form of the back-calculation algorithm was chosen to describe the milling process. There were five estimated parameters of the validated kinetic model of the porang chip milling process.
Modelling Radiation Dose Distribution within Thorax using Monte Carlo Package Codes
Authors: Herwiningsih Sri , Fielding Andrew 
Published: June 2019

Abstract
In radiotherapy practice, it is difficult to measure radiation dose within patient anatomy. Although it is possible to do so, the technique would cause discomfort and pain to the patient due to the insertion of the radiation detector inside the patient’s body. Monte Carlo simulation offer a non-invasive technique to estimate radiation dose distribution within the patient’s body. This paper presents a work on modelling the radiation dose distribution within the thorax region in lung cancer treatment cases. EGSnrc/DOSXYZnrc Monte Carlo codes were employed in this study. Patient anatomy was modelled by converting the images data obtained from Computed Tomography (CT) scan to EGSPHANT files. Three CT images set from three lung cancer patients were used in this study. The simulated data were compared with the treatment planning data by using a gamma analysis with selection criteria of 3% dose difference and 3 mm distance-to-agreement. The results show that a good agreement was obtained between the simulated data and the treatment planning data which is indicated by the gamma analysis results of > 95%.
Development of Flow Injection-Spectrophotometry Method for Hydroquinone Determination Based on The Formation of Blue Starch-Iodine Complex
Authors: Trenggamayunelgi Fahrana Salas , Sulistyarti Hermin , Retnowati Rurini 
Published: June 2019

Abstract
Hydroquinone (1,4-dihydroxybenzene) is an aromatic organic phenolic compound used in drug and should not be used as cosmetic products. Although the use of hydroquinone has been banned in cosmetics, it is still found at low concentration for skin whitening. The effect for excess use of hydroquinone can cause irritation and changes in skin color become blackish permanently. The determination of hydroquinone can be performed by a flow injection system with spectrophotometric detection based on the redox reaction between hydroquinone and iodine. Under this method, hydroquinone can be determined based on the decreasing intensity of the blue color of the starch-iodine complex when hydroquinone was added to the solution. Hydroquinone will react with the excess iodine, thus iodine is reduced to iodide. The rest of iodine which does not react with hydroquinone, will form a blue complex with starch in an acidic condition (pH = 1). The blue color of the starch-iodine complex was analyzed by visible spectrophotometry at a wavelength of 628 nm. The optimum conditions for determination of hydroquinone using the flow injection system provide at 0.05 % starch and 40 mg/L iodine by the length of mixing coil of 50 cm on the flow rate of 5.8 mL/min, and a sample volume of 100 µL. Under these optimum conditions, the flow injection method showed the linearity from 0 to 15 mg/L with a correlation (R2) of 0.9941.
The Effect of Stirring Time on The Characteristics of Carbonated Hydroxyapatite from Pearl Shells (Pinctada maxima)
Authors: Anggraini R M , Yusuf Yusril 
Published: June 2019

Abstract
Carbonated hydroxyapatite (CHAp) is hydroxyapatite (HAp) substituted by carbonate ions that has bioactivity because of their similarities to the natural bone. Pearl shells (Pinctada maxima) have been used as natural ingredients for the synthesis of B type CHAp using precipitation method with different stirring time (0 h, 2 h, and 4 h). The CHAp was characterized by using X-Ray Diffractometer (XRD), Fourier Transform Infrared (FTIR), and Scanning Electron Microscopy (SEM). The XRD results show the characteristics of B type CHAp from the position of the main peak and some diffraction plane, as well as from lattice constants a and c. The position of the main peak and plane (300) is above the position of pure HAp, plane (002) is below the position of pure HAp, and the lattice constants a are smaller than 9.418 Ǻ and c higher than 6.884. FTIR results showed that the main peak B type CHAp found at wavenumbers 874, 1450 and 1420 cm−1. According to the FTIR data, it can be concluded that stirring time variations was affecting the intensity of the functional group peaks. The smallest crystal deffect found in 2 h stirring sample based on the calculation of microstrain. SEM results indicated that CHAp morphology was affecting by stirring time. The morphology of CHAp tends to agglomerate for sample with 4 h stirring time.
Effects of Ni and Annealing Temperature on Crystal Structure and Magnetic Properties of MnNi-Fe2O4 Nanoparticles
Authors: Herdiman  , Saputra A I , Suharyadi E , Kato T , Iwata S 
Published: June 2019

Abstract
Manganese nickel ferrite (MnNi-Fe2O4) nanoparticles have been synthesized by co-precipitation method. In this research, the effects of Ni concentration (0.2-0.8M) and annealing temperature (400-1000°C) on the structural and magnetic properties of nanoparticles were studied. Ferrite samples were characterized by X-ray Diffractometer (XRD), Transmission Electron Microscope (TEM) and Fourier Transform Infrared (FTIR) spectroscope. The XRD patterns showed that nanoparticles possess cubic spinel structure that indicated by peaks of (220), (311), (400), (511) and (440). The crystallite size decreased with the increase of Ni concentration (23.5-4.5 nm) and increased with the increase of annealing temperature (14.8-49.3 nm). Stretching vibration on octahedral and tetrahedral of metal-oxygen from FTIR spectra was observed at 354.9 - 462.9 cm−1 and 586.3 - 601.7 cm−1, respectively. Magnetic properties of ferrite sample were analyzed by Vibrating Sample Magnetometer (VSM). The saturation magnetization (Ms) lay in the range of 11.07 – 20.7 emu/g and the Coercivity (Hc) decreases with the increase of annealing temperature (217.0 – 167.0 Oe).
Structure, Morphology, Electrical Transport, and Magnetoresistance Properties of La0.7Ba0.1Sr0.2Mn0.9Cu0.1O3
Authors: Kurniawan Budhy , Imaddudin Agung , Komala Tesya , Faruq Umar , Nur Alfin Naufal , Bisma Bathara , Razaq Dhawud Sabilur , Munazat Dicky Rezky 
Published: June 2019

Abstract
The structure, morphology, electrical transport and magnetoresistance properties of La0.7Ba0.1Sr0.2Mn0.9Cu0.1O3 has been investigated. The sample has been successfully prepared using sol-gel method. Structural investigation using X-ray diffraction (XRD) shows that the sample crystallizes in rhombohedral structure with R3c space group. The surface morphology of the sample shows that the sample consists of irregular polygonal grain. Furthermore, resistivity measurement shows that the sample undergoes a transition from metal to semiconductor behaviour upon heating. The electrical properties of the sample follow the electron-phonon-magnon scattering theory. Under the influence of the external magnetic field, the sample shows that up to 8% of the resistivity decreased at 200 K.
Effect of Calcium Carbonate on The Tensile and Density Properties of Kenaf/Polyester Hybrid Composite
Authors: Wicaksono S T , Laksana A H , Ardhyananta Hosta 
Published: June 2019

Abstract
Kenaf (Hibiscus cannabinus L.) was a plant belonging to the Malvaceae family. Kenaf was a natural fiber that has attracted researchers to explore its properties as reinforcement materials in composites. In addition, calcium carbonate (CC) particle can also improve the mechanical properties of composite. The aim of this study was to describe the fabrication of calcium carbonate particle reinforced kenaf/polyester hybrid composite. The hybrid composites were prepared using hand lay-up process with different particle loading (2.5%, 5%, 7.5%, 10% and 20% by weight). The hybrid composites were tested for tensile strenght using ASTM D368 standard. The highest tensile strength were showed for 5% wt calcium carbonate reinforced kenaf/polyester hybrid composite in this investigation. It was also observed that the density for hybrid composite decreased as the particle content increased.
Fabrication of Mixed Matrix Membrane Polysulfone - Zeolite Carbon Composites (ZCC) For Gas Separation
Authors: Larasati Z S , Wijiyanti R , Karim Z A , Ismail A F , Widiastuti N 
Published: June 2019

Abstract
Mixed matrix membrane polysulfone (PSF) - zeolite carbon composite (ZCC) was successfully fabricated in this study. The composition of ZCC as a filler in this membrane was 1%. Mixed matrix membrane PSF-ZCC 1 wt% was compared by neat polysulfone membrane. The prepared membranes were characterized using XRD to determine the membrane structure and FTIR to determine the functional groups in the membrane. The results of gas permeation for membrane permeability of O2 were 4.011 and 7.193 GPU for neat PSF and PSF-ZCC 1 wt% membrane, respectively. In addition, the permeability value of N2 was 5.603 and 7.862 GPU for neat PSF and PSF-ZCC 1 wt% membrane, respectively. Selectivities of O2/N2 for neat PSF and PSF-ZCC 1 wt% membrane were 0.715 and 0.914, respectively. The increasing permeability along with the addition of ZCC filler indicated that the membrane in this study is potentially applied for O2 and N2 separation.