bluuebunny/crossref_metadata_2025 huggingface dataset:
Diagnosing Middle Ear Pathology in 6- to 9-Month-Old Infants Using Wideband Absorbance: A Risk Prediction Model
Authors: Myers Joshua , Kei Joseph , Aithal Sreedevi , Aithal Venkatesh , Driscoll Carlie , Khan Asaduzzaman , Manuel Alehandrea , Joseph Anjali , Malicka Alicja N.
Published: September 2018

Purpose

The aim of this study was to develop a risk prediction model for detecting middle ear pathology in 6- to 9-month-old infants using wideband absorbance measures.

Method

Two hundred forty-nine infants aged 23–39 weeks (
Mdn
= 28 weeks) participated in the study. Distortion product otoacoustic emissions and high-frequency tympanometry were tested in both ears of each infant to assess middle ear function. Wideband absorbance was measured at ambient pressure in each participant from 226 to 8000 Hz. Absorbance results from 1 ear of each infant were used to predict middle ear dysfunction, using logistic regression. To develop a model likely to generalize to new infants, the number of variables was reduced using principal component analysis, and a penalty was applied when fitting the model. The model was validated using the opposite ears and with bootstrap resampling. Model performance was evaluated through measures of discrimination and calibration. Discrimination was assessed with the area under the receiver operating characteristic curve (AUC); and calibration, with calibration curves, which plotted actual against predicted probabilities.

Results

AUC of the fitted model was 0.887. The model validated adequately when applied to the opposite ears (AUC = 0.852) and with bootstrap resampling (AUC = 0.874). Calibration was satisfactory, with high agreement between predictions and observed results.

Conclusions

The risk prediction model had accurate discrimination and satisfactory calibration. Validation results indicate that it may generalize well to new infants. The model could potentially be used in diagnostic and screening settings. In the context of screening, probabilities provide an intuitive and flexible mechanism for setting the referral threshold that is sensitive to the costs associated with true and false-positive outcomes. In a diagnostic setting, predictions could be used to supplement visual inspection of absorbance for individualized diagnoses. Further research assessing the performance and impact of the model in these contexts is warranted.
Facing the Challenges of Primary Progressive Aphasia: The Spousal Perspective
Authors: Pozzebon Margaret , Douglas Jacinta , Ames David
Published: September 2018

Purpose

Primary progressive aphasia (PPA) is a cognitive–neurodegenerative disorder. Little is known about the personal impact PPA has on those living with this condition, particularly from a spousal perspective. The aim of this qualitative study was to gain an understanding of the personal experiences of spouses living with a partner diagnosed with variant forms of PPA

Method

Thirteen spouses whose partners were diagnosed with PPA participated in 1:1 semistructured, in-depth interviews to explore their lived experiences of this illness. Using a constructivist grounded theory approach, analysis moved through a process of data-driven open and focused coding for the identification of emergent categories, themes, and subthemes that captured the challenges faced by spouses while supporting their partners.

Results

A constructivist grounded theory analysis of the interview data revealed an overarching theme of “facing the challenges of PPA” that captured the experience spouses encountered when living with a partner diagnosed with PPA. Four interdependent and overlapping themes that sat within this overarching theme included acknowledging disconnect in the spousal relationship, living the decline, readjusting sense of self, and getting on with living. Each of these core themes revealed how spouses dealt with the ongoing and evolving challenges of PPA, particularly concerning changing relational dynamics with their partner and adjusting their own self-conceptualization.

Conclusions

Greater understanding of the spousal experiences of PPA is crucial to the development of intervention to help sustain spouses' emotional and relational connections with their partner.
A Phonetic Complexity-Based Approach for Intelligibility and Articulatory Precision Testing: A Preliminary Study on Talkers With Amyotrophic Lateral Sclerosis
Authors: Kuruvilla-Dugdale Mili , Custer Claire , Heidrick Lindsey , Barohn Richard , Govindarajan Raghav
Published: September 2018

Purpose

This study describes a phonetic complexity-based approach for speech intelligibility and articulatory precision testing using preliminary data from talkers with amyotrophic lateral sclerosis.

Method

Eight talkers with amyotrophic lateral sclerosis and 8 healthy controls produced a list of 16 low and high complexity words. Sixty-four listeners judged the samples for intelligibility, and 2 trained listeners completed phoneme-level analysis to determine articulatory precision. To estimate percent intelligibility, listeners orthographically transcribed each word, and the transcriptions were scored as being either accurate or inaccurate. Percent articulatory precision was calculated based on the experienced listeners' judgments of phoneme distortions, deletions, additions, and/or substitutions for each word. Articulation errors were weighted based on the perceived impact on intelligibility to determine word-level precision.

Results

Between-groups differences in word intelligibility and articulatory precision were significant at lower levels of phonetic complexity as dysarthria severity increased. Specifically, more severely impaired talkers showed significant reductions in word intelligibility and precision at both complexity levels, whereas those with milder speech impairments displayed intelligibility reductions only for more complex words. Articulatory precision was less sensitive to mild dysarthria compared to speech intelligibility for the proposed complexity-based approach.

Conclusions

Considering phonetic complexity for dysarthria tests could result in more sensitive assessments for detecting and monitoring dysarthria progression.
New traction motor sizing strategy for an HEV/EV based on an overcurrent‐tolerant prediction model
Authors: Cash Scott , Zhou Quan , Olatunbosun Oluremi , Xu Hongming , Davis Sean , Shaw Robin
Published: September 2018

This study presents a new hybrid and electric vehicle (HEV/EV) traction motor sizing strategy, an overcurrent‐tolerant prediction model is used to estimate the dynamic and thermal characteristics of a motor operating in the overcurrent region. This can be used to determine if a prospective traction motor and powertrain configuration is able to fulfil the HEV/EVs target dynamic objectives. Since the prediction model only requires minimal motor torque–speed characteristics, it can be a useful tool during the early development stages of an HEV/EV when the detailed motor parameters used in analytical models cannot be obtained. Allowing the motor to operate in the overcurrent region could downsize the traction motor used in the final HEV/EV design to one that is smaller, easier to package and likely to run in a higher efficiency region. A case study is explored where this sizing strategy is used to convert an aeroplane pushback vehicle into a series HEV and tasked with following a rigorous duty cycle. The feasibility of two HEV configurations is then analysed further. The final HEV design reduces the fuel consumption and engine emissions by up to 52% from the original internal combustion engine powered vehicle.
Optical linear polarization measurements of quasars obtained with the Very Large Telescope at Paranal Observatory
Authors: Hutsemékers D. , Borguet B. , Sluse D. , Pelgrims V.
Published: September 2018

We report 87 previously unpublished optical linear polarization measurements of 86 quasars obtained in May and October 2008, and from April to July 2015 with the FOcal Reducer and low-dispersion Spectrographs FORS1 and FORS2 attached to the Very Large Telescope at the Paranal Observatory. Of the 86 quasars, 37 have p ≥ 0.6%, 9 have p ≥ 2%, and 1 has p ≥ 10%.
GRB 171205A/SN 2017iuk: A local low-luminosity gamma-ray burst
Authors: D’Elia V. , Campana S. , D’Aì A. , De Pasquale M. , Emery S. W. K. , Frederiks D. D. , Lien A. , Melandri A. , Page K. L. , Starling R. L. C. , Burrows D. N. , Breeveld A. A. , Oates S. R. , O’Brien P. T. , Osborne J. P. , Siegel M. H. , Tagliaferri G. , Brown P. J. , Cenko S. B. , Svinkin D. S. , Tohuvavohu A. , Tsvetkova A. E.
Published: September 2018

Context. Gamma-ray bursts (GRBs) occurring in the local Universe constitute an interesting sub-class of the GRB family, since their luminosity is on average lower than that of their cosmological analogs. Attempts to understand in a global way this peculiar behaviour is still not possible, since the sample of low redshift GRBs is small, and the properties of individual objects are too different from each other. In addition, their closeness (and consequently high fluxes) make these sources ideal targets for extensive follow-up even with small telescopes, considering also that these GRBs are conclusively associated with supernova (SN) explosions.

Aims. We aim to contribute to the study of local bursts by reporting the case of GRB 171205A. This source was discovered by Swift Burst Alert Telescope (BAT) on 2017, December 5 and soon associated with a low redshift host galaxy (z = 0.037), and an emerging SN (SN 2017iuk).

Methods. We analyzed the full Swift dataset, comprising the UV-Optical Telescope (UVOT), X-ray Telescope (XRT) and BAT data. In addition, we employed the Konus-Wind high energy data as a valuable extension at γ-ray energies.

Results. The photometric SN signature is clearly visible in the UVOT u, b and ν filters. The maximum emission is reached at ∼13 (rest frame) days, and the whole bump resembles that of SN 2006aj, but lower in magnitude and with a shift in time of +2 d. A prebump in the ν-band is also clearly visible, and this is the first time that such a feature is not observed achromatically in GRB–SNe. Its physical origin cannot be easily explained. The X-ray spectrum shows an intrinsic Hydrogen column density NH,int = 7.4+4.1−3.6 × 1020 cm−2, which is at the low end of the N
H, int, even considering just low redshift GRBs. The spectrum also features a thermal component, which is quite common in GRBs associated with SNe, but whose origin is still a matter of debate. Finally, the isotropic energy in the γ-ray band, Eiso = 2.18+0.63−5.0 × 1049 erg, is lower than those of cosmological GRBs. Combining this value with the peak energy in the same band, Ep = 125+141−37 keV, implies that GRB 171205A is an outlier of the Amati relation, as are some other low redshift GRBs, and its emission mechanism should be different from that of canonical, farther away GRBs.
Geo-thermochronology of the Saint Antonin basin, south-eastern France
Authors: Jourdan Sébastien , Bernet Matthias , Hardwick Elizabeth , Paquette Jean-Louis , Tricart Pierre , Senebier François , Coeur Francis
Published: September 2018

The clastic sedimentary formations of the Saint Antonin basin in the French Maritime Alps contain the record of the Early Oligocene erosional history of the Maures-Esterel massif, Sardinia and Corsica. Detrital apatite fission-track dating and zircon fission-track/U-Pb double dating of samples collected from the Saint Antonin basin confirm sediment provenance and allow obtaining first-order estimates of drainage basin maximum and long-term average exhumation rates. Whereas average exhumation rates were on the order of 0.1–0.2 km/Myr during the Early Oligocene, small parts of the Saint Antonin basin source areas may have experienced maximum exhumation rates on the order of 0.4–0.7 km/Myr. Although zircons and apatites with Early Oligocene fission-track cooling ages make up between 11–15% of the dated grains, a possible volcanic contribution is negligible, as only one single volcanic zircon grain was identified by fission-track/U-Pb double dating. Regional geodynamic processes with convergence in the Western Alps to the east and the end of the Pyreneo-Provençal compression phase by the early Oligocene controlled the differences in basin fill history and sediment provenance between the Saint Antonin basin and the largely contemporaneous Barrême basin in south-eastern France.
The behaviour of measles transmission in three different populations
Authors: Prawoto Budi Priyo , Maulana Dimas Avian , Astuti Yuliani Puji
Published: September 2018

SIR Model can be employed to model the transmission of either fatal or non-fatal disease within a closed population based on certain assumptions. In this paper, the behaviour of non-fatal diseases transmission model is observed from three types of population, that is (i) increasing population, (ii) constant population, (iii) decreasing population. This paper acquired two equilibria, i.e, the disease-free equilibrium point [see formula in PDF] and the endemic equilibrium point [see formula in PDF]. At the disease-free equilibrium, the behaviour of the model is stable when [see formula in PDF], while at the endemic equilibrium, its behaviour is stable for any positive parameters α, β, μ, μS, μI, and μR.
Synthesis of La1-xCaxMnO3 (x = 0 and 0.2) through ultrasonic mixing and its characterisation
Authors: A M Mangasi , Sugihartono Iwan , B P Teguh , Saptari Sitti Ahmiatri , Handoko Erfan
Published: September 2018

In order to investigate the crystal structure and morphology of perovskite manganite materials, we have been successfully synthesized LaMnO3 and La0,8Ca0,2MnO3 systems through ultrasonic mixing method. The application of these materials is the alternative cooler technology beside freon gas using with residual emission gas. Stoichiometric mixture of La2O3, MnCO3, and CaO with more than 95 % purity were be prepared by ultrasonic mixing 40 kHz 60 watts for 30 minutes to result homogen mixtures. The samples were calcinated at 800°C for 1 h and sintered at 1100°C for 3 h. The structure of the samples was examined by X-ray diffractometer (XRD) Phillips and result as single phase of perovskite manganite materials. Morphology was studied using a 5310LV Jeol scanning electron microscope (SEM) that show the same grains of perovskite manganite material. While Ca substituted for La in the sample, the grain size decreases with decreasing the volume of cell units and finally the particle size of La0.8Ca0.2MnO3 phase decreases.
Spatial pattern analysis and identification type of open green space in Yogyakarta city
Authors: Dimyati Muhammad , Fauzy Akhmad , Putra Anggara Setyabawana
Published: September 2018

Open green Space is a spatial plan model aiming to maintain the quality of the environment. Nowadays, the number and distribution of Open green Space have decreased, particularly in urban areas. Such decline is due to many reasons, one of which is land conversion caused by social activities. This research aimed to analyse the distribution pattern and identify the type of Open green Space in Yogyakarta City. The method in this study using moran's I Index approach, GIS and direct field review. The results showed that the Open green Space was clustered with Moran's Index of 0,074594. Validation with field check indicated that there was an absence of even, thorough, and most recent Open green Space identification. Visual detection using high-resolution satellite images and aerial photos affirmed that many open green spaces had not been inventoried, justifying the need for data update in Yogyakarta City. The identification process resulted in different types of Open green Space, but the most widely distributed ones in Yogyakarta City were in the forms of Private yard, Office park, Green belt, and City Parks.
Pseudo-prime number simulation and its application for security purpose
Authors: Rahim Robbi , Kurniasih Nuning , Pohan Nurmaliana , Sriadhi S , Listyorini Tri , Nanuru Ricardo Freedom , Manurung Rosida Tiurma , Najmurrokhman Asep , Hasibuan Abdurrozzaq , Abdullah Dahlan , Napitupulu Darmawan
Published: September 2018

Many public cryptography schemes rely on the use of prime numbers like for encryption and decryption. A prime number is one number that is widely used and large and consists of hundreds of digits, so it takes time to test whether the numbers are prime or not. Miller-Rabin is one algorithm that could be used to test prime number. Simulation to show how to test non-prime number elimination process can be used to determine the workings of the Miller-Rabin algorithm and also could be used as a media learning for students and lecturers to know how prime number test and generation.
Prototyping AR EduGame for children: learning Indonesian culture
Authors: Sudarmilah Endah , Supriyono Heru , Fadlilah Umi , Yasin Al Irsyadi Fatah , Fatmawati Azizah
Published: September 2018

Learning Indonesian culture is a part of the curriculum for elementary school students. However, it faces a challenge of the decreased interest of reading textbooks. It can be solved by using a 3D animation that is loved by the children. Therefore, this study aimed to design a prototype of augmented reality (AR) EduGame (Educational Game) as a learning media of Indonesian culture for the children. This study used research and development method for an AR application, and then its system was tested on black box testing. The AR EduGame prototype and its testing results are run appropriately, system testing show that every button and transition for both AR EduGame applications, traditional dance and gamelan. Morover, it can be implemented by elementary school children.
Design of personnel information systems using rapid application development method
Authors: Fatimah Dini Destiani Siti , Supriatna Asep Deddy , Kurniawati Rina
Published: September 2018

Information system is a system that is interconnected and integrated with each other and aims to provide personnel information to support operations, management and decision-making functions within an organization. The purpose of this research is to build personnel information system with Rapid Application Development (RAD) method. The methodology used in this design is the RAD method which consists of identifying the objectives and information requirements, designing the system, building the system, and introducing the new system. This study is limited to the design stage only. The design result is a more effective and efficient employee information system design. The conclusion of this research is that the information system built with RAD method takes shorter time, but required good coordination between system designer with user.
δ aminolevulinic acid dehydratase (ALAD) gene polymorphism of marine taskforce personnel whit routine exposure of lead suspended in air
Authors: Puspitaningrum Rini , Adhiyanto Chris , Sartono Nurmasari , Palgunadi Palgunadi , Solihin Solihin , Yamashiro Yasuhiro , Hattori Yukio
Published: September 2018

The pollutant lead (Pb-plumbum-black lead) is toxic. Organisms in nature cannot naturally suppres its concentration. Special Capital Region of Jakarta is a metropolitan city with densest highway traffic in the world, especially in and around the Marunda area, which is the location 24-hour non-stop loading and unloading activities of various businesses. With that environmental condition, in the Marunda area of Jakarta lies the Naval base where the Marine Taskforce Personnel are stationed. The environmental condition allows the personnel to be quite frequently exposed to lead. This research aims to detect the ALAD gen mutation in the Marine Taskforce personnel as a mapping of the level of ALAD gene mutation frequency in the Marines of the Jakarta area. The research was conducted in a period of [insert data]. The sampling applied the purposive sampling method with a sample size of 100 Marines. The research results show that there was no ALAD gene mutation in the 100 Marines. This could depict a good energy status of the 100 Marines stationed in the Marunda area. With no mutation found in the ALAD gene, that means the process of oxygen binding with hemoglobin has no disruption in energy synthesis.
Antihyperglycemic and diabetic wound healing activity of smallanthus sonchifolius leaves extract
Authors: Herowati Rina , Saputri Alip D.S. , Wijayanti Tri , Widodo Gunawan P.
Published: September 2018

Diabetic patient tend to suffer from lower extremity complication that contribute to the occurence of diabetic foot ulcer. Smallanthus sonchifolius or yacon leaves extract has been used as an alternative medicine for diabetes and also showed antibacterial activity. This research aims to obtain the antihyperglycemic and diabetic wound healing activity of yacon leaves extract. Diabetic condition of rat was induced by streptozotocin (45 mg/kg bw) and nicotinamide (110 mg/kg bw). Rats were then allowed to develop diabetes for 21 days. A biopsy punch then was used to create a wound. Yacon leaves extract were administered by oral and topical for 14 day. The serum glucose level and diameter of the wound were measured every week, and histopatology study of the skin was conducted at the end of the study. Oral administration of yacon leaves extract (150 mg/kg bw) together with topical administration showed antihyperglycemic as well as diabetic wound healing activities comparable to the reference drugs (glibenclamide oral and nebacetin cream).
Adverse event of antiepileptic drugs: a cross sectional study
Authors: Permatananda P A N K , Kristin E , Endharti D , Pinzon R T , Sumada I K
Published: September 2018

Epilepsy is a major non-communicable disorder. Choice between switching to another drug and combining is still debatable when the first antiepileptic drug is ineffective in controlling seizure. Polytherapy usually related with the appearance of adverse effect. This cross sectional study was conducted in Neurology Policlinic with 83 epilepsy patients, consisting of 37 patients used monotherapy and 46 patients used polytherapy. The most common adverse effect was fatigue. Statistical analysis using chi square test showed statistically significant between monotherapy and polytherapy patients against fatigue (p value >0.05). In conclusion, polytherapy is related with the appearance of adverse effect in epilepsy patients.
Experimental investigation on the performance of residential air conditioning system using water condensate for subcooling
Authors: Sumeru Kasni , Pramudantoro Triaji Pangripto , Setyawan Andriyanto
Published: September 2018

The experimental investigation of subcooling effects on system COP was carried out on a residential air conditioning using R410A as working fluid, with a compressor capacity of about 0.75 kW. In the experiment, the indoor and outdoor temperatures were controlled at 24°C and 32°C. The results showed that the use of condensate water lowers the refrigerant temperature in the condenser outlet by 2.7°C. By lowering the refrigerant temperature, the cooling capacity of the air conditioning can be enhanced. The decrease in of refrigerant temperature results in COP improvement 16.4%. Besides increasing the COP, the condensate water also decreases the discharge compressor temperature by 7.6°C. The decrease in of the discharge compressor temperature resulted in the decrease in power consumption of the air conditioning system by 5.9%.
Numerical study of effect of cooling channel configuration and size on the product cooling effectiveness in the plastic injection molding
Authors: Prasetiyo Angger Bagus , Fauzun Fauzun
Published: September 2018

Injection molding is most frequently used manufacturing processes in the plastics industry. In the plastic injection molding process the cooling channel has an important role for the cooling process of the product. The good cooling channel is indicated by the ability to absorb heat from the product quickly and uniformly on the each side of the product. This study compared straight and conformal cooling channels with diameters 8 mm to know it is effects on pattern of temperature distribution in the mold and cooling effectiveness of the product inside mold using Fluent software. Analysis of virtual model images shown that those with conformal cooling channels can predict significant heat absorption compared with straight cooling channel.
Identification of fresh and expired ground roasted robusta coffee using UV-visible spectroscopy and chemometrics
Authors: Yulia Meinilwita , Suhandy Diding
Published: September 2018

The freshness of ground roasted coffee escapes extremely fast. For this reason, the evaluation of conservation state of ground roasted coffee must be taken into account for acceptability of coffee. Unfortunately, it is difficult to discriminate the fresh and expired ground roasted coffee physically by our naked eyes. Thus, it is desired to develop an analytical method to evaluate the fresh and expired ground roasted coffee using reliable methods. The objective of this research was to evaluate the potential of UV-visible spectroscopy and chemometrics method for classification of fresh and expired ground roasted robusta coffee. A number of 200 samples of robusta fresh coffee and 200 samples of robusta expired coffee was used. The spectral data were pre-treated using standard normal variate (SNV), moving average smoothing (window: 9) and Savitzky-Golay 2nd derivative (order: 2; window: 11). The analysis data was done statistically using multivariate chemometric techniques, including principal component analysis (PCA) and soft independent modeling of class analogy (SIMCA) in the spectral range of 230-400 nm. PCA with PC1 = 94% and PC2 = 4% showed clear clustering of samples (p ≤ 0.05). UV-visible spectroscopy with SIMCA analysis allowed to classify between fresh and expired ground roasted robusta coffee with a correct classification rate of 100%.
The influences of polydopamine immersion time on characteristics and performance of polyvinylidene fluoride ultrafiltration membrane
Authors: Syawaliah Syawaliah , Arahman Nasrul , Riza Medyan , Mulyati Sri
Published: September 2018

The Polyvinylidene Fluoride (PVDF) membrane has been prepared by phase inversion method using N,N-dimethylacetamide (DMAc) as solvent and Poly Ethylene Glycol (PEG) as additive. The fabricated membrane was modified by Polydopamine (PDA) coating in concentration of 0.5 mg/ml and immersion times of 2 hours, 6 hours, and 24 hours. The characteristics and performance of the PVDF membranes before and after the modification are studied in this paper. The result of the water flux experiment showed that the PDA-coated PVDF membranes showcased a higher flux than that of pure PVDF membrane. Scanning Electron Microscopy (SEM) analysis confirmed that the membrane had an asymmetric structure consisting of two layers. There was no significant influence on the addition of PDA to the morphology of the pore matrix because the modification was done by surface coating. Fourier Transform Infrared Spectroscopy (FTIR) analysis showed that PDA was successfully introduced on the surface of PVDF membrane with the appearance of O-H from cathecol and N-H peaks at wavenumber range of 3300-3600 cm-1. Modification with PDA increased the mechanical strength of the membrane which affirmed by the results of the tensile and elongation at break evaluation.
Synthesis of silica of rice husk modification (3-aminopropyl) trietoxysilane for adsorption methylene blue
Authors: Yusmaniar Yusmaniar , Darwis Darsef , Afrizal Afrizal , Annisa Annisa
Published: September 2018

In this study, modified silica (3-Amynopropyl) triethoxysilane (APTES) synthesis and adsorption test of MB dye were performed. Silica is synthesized by sol-gel method and modified with APTES. APTES modified silica is characterized using several instruments, scanning electron microscopy (SEM), fourier transform infrared (FTIR), surface area analyzer (SAA) and UV-Vis spectrophotometer. The composite has a large surface area and has a mesoporous shape. At alkaline pH, MB dye can adsorb well. In addition, MB absorption is also maximized with the longer time of adsorption. The APTES modified silica adsorption process follows the Langmuir isotherm pattern. Thus, APTES modified silica can be used as an alternative to environmentally friendly and low-cost adsorbents.
A low cost 3D-printed robot joint torque sensor
Authors: Siradjuddin Indrazno , Wicaksono Rendi Pambudi , Murdani Anggit , Dewatama Denda , Ronilaya Ferdian , Rohadi Erfan , Asmara Rosa Andrie
Published: September 2018

Technological advances allow researchers to develop advanced arm robots and can safely work side by side with humans Therefore, a robot arm controller can be designed in such way that the robot arm can move along the desired trajectories and act upon external influences, in this last case, the torque sensor plays an important rule. Currently torque sensors are available in the market has a high price. In this work, an inexpensive robot joint torque sensor is presented. Most parts of this sensor are made using 3D printers. While the other components are easily can be found in the market and with a relatively low-costs. The development of this sensor is intended to facilitate the prototyping of the robot arm for educational and research purposes. The basic idea of the sensor mechanism is to convert torque into a force absorbed by a spring. Then, the encoder senses the direction and the value of the input torque. This torque sensor can be easily too customized. Thus this sensor can be tailored to the needs by replacing some parts such as encoder and spring. The mechanism of this sensor can also be adjusted with the actuator to be paired. Experiments have been conducted to verify the accuracy and the performance of the proposed torque sensor.
Stabilising a cart inverted pendulum with an augmented PID control scheme
Authors: Siradjuddin Indrazno , Amalia Zakiyah , Setiawan Budhy , Ronilaya Ferdian , Rohadi Erfan , Setiawan Awan , Rahmad Cahya , Adhisuwignjo Supriatna
Published: September 2018

A cart inverted pendulum is an under actuated system that highly unstable and nonlinear. Therefore, it makes a good problem example which attracts control engineers to validate the developed control algorithms. In this paper, an augmented PID control algorithm is proposed to stabilise a cart inverted pendulum at the desired state. The derivation of a mathematical model of the cart inverted pendulum using Lagrange's equation is discussed in detail. The system dynamics is illustrated to understand better the behaviour of the system. A simulation program has been developed to verify the performance of the proposed control algorithm. The system dynamic behaviours with respect to the variation of the controller parameters are analysed and discussed. Controllers parameters are expressed into two PID gain sets which associated with 2 dynamic states: the cart position (ϰ) and the pendulum angle (θ). It can be concluded from the simulation result that the proposed control algorithm can perform well where acceptable steady errors can be achieved. The best response from the cart inverted pendulum system has been obtained with the value of kPX 190, kDX 50, kIX 5, kPθ 140, kDθ 5, and kIθ 25.
Green energy harvesting from human footsteps
Authors: Abadi Putri Berlian , Darlis Denny , Suraatmadja Mas Sarwoko
Published: September 2018

The need for a sustainable green energy is increasing, while the availability of energy itself is not comparable to the needs. One of the most rapid activities in human life is footstepping. The large amounts of kinetic energy in term of pressure force are generated in every footstep activities at the crosswalk space, lecture building, office, shopping centre or market area. As an alternative energy that still has not been exploited, these human steps can be used to power some low voltage loads. In this study, a tile constructed with some piezoelectric transducers are designed and implemented to generate electrical pulses and harvesting human feet step energies. The piezoelectric transducers used in this study is Lead Zirconate Titanate type. From the pizoelectric floor energy harvester system, a tile consists of 20 pieces parallel connected piezoelectric transducer can produce AC voltage up to 71.20 V. While the average generated voltage is 63.98 V. So the average power is 0.0604 watt/10 footsteps. We conclude that this piezoelectric generator can be generated more power when arranged with some tiles arrangement, so we can harvest this energy efficiently.
Efficient energy consumption for indoor mobile robot prototype under illumination
Authors: Angelina Seilla , Afifah Shofuro , Susamti Paramadina , Ardianto Priramadhi Rizki , Darlis Denny
Published: September 2018

In the next 20 years, energy consumption is expected to increase up to 30% and it will affect energy crisis. Energy crisis can be resolved by energy efficiency. The context of this paper is about the energy efficiency of a mobile robot in the industrial warehouse. Communications media which commonly used in mobile robot navigation such as Laser need large power consumption. In order to reduce power consumption, the system of this paper is designed to use visible light communication (VLC) for mobile robot navigation because VLC only utilize lights as the transmitter. Method of this paper is sending the data contained navigation coordinates which modulated on the lighting system, then data will be received by the photodetector and processed as mobile robot's navigation. From above system, by using 5,68-watt power on lighting system can be used to transmit navigation data with the range up to 2 meters. In the receiver side, a photodetector which uses as receiver generate maximum power 4,14 watt at 10 cm of height between transmitter and receiver while minimum generated power is 3,21 watt at 250 cm of height. The conclusion of this paper is generated power by a photodetector in navigation process mobile robot is affected by angle and distance between transmitter and receiver.
Validation of CO dispersion model due to the road position on the dominant wind direction on transport sector
Authors: Bachtiar Vera Surtia , Purnawan  , Afrianita Reri , Anugerah Randa
Published: September 2018

This study aims to validate CO dispersion model due to the position of the road toward the dominant wind direction on the transport sector. Sampling for modelling was done on the road with the road angle to wind direction is 0 degree (Jend. A. Yani Road), 30 degree (Andalas Road) and 60 degree (Prof. Dr. Hamka Road). CO dispersion model was obtained from the relations between CO concentration with traffic volume, traffic speed, wind speed and dominant wind direction. Sampling for validation was done at three location points, i.e. Jend. Ahmad Yani Road, By Pass Road and Dr. Wahidin Road, each of which has a position of 0, 45 and 90 degrees toward dominant wind direction. Sampling for CO was done using impinger. Measurement of traffic characteristics and meteorological conditions was performed in conjunction with CO sampling. Validation test was done by using Pearson Product Moment formula and Test of Two Variance. Results of the Two-Variance Test showed no significant difference between two concentrations of CO model and CO measurement. It showed the Test Ratio (RUf) smaller than the Critical Point. Validation test using Pearson Product Moment showed that the CO model can be used for predicting CO dispersion.
Starch producing in microalga biomass as a raw material for bioethanol
Authors: Putri Fiona , Silalahi Mawar DS , Rinanti Astri
Published: September 2018

A preliminary research in the field of environmental biotechnology to the production of biofuel from the tropical microalga consortium consisting ofChlorella vulgarisandClosteriumsp have been done. Microalga cultivation in batch culture are controlled at temperature of 25°C, PH 6, aeration of 1 ml/sec, and lights of 4000 lux. Nutrient sources utilize artificial Provasoli Heamatococcus Media which consist of micro and macro nutrients. Analysis of bioethanol from microalga start with finding the maximum starch production from wet weight of biomass, dried weight of biomass, and at hydrolysis. Hydrolysis is proceeded by adding HCL 1 Molar as much as 0.04 grams of dried weight of biomass. The analysis of starch is proceeded by nelson samogy method by adding alkali and pre reaction arsenomolibdat. Absorbent is measured through the wave length 540 nm by spectrofotometre. The average of dried weight biomass is 0,8 grams/liter. Research reveal that the highest starch production is occured in microalga consortium at hydrolysis process and produces starch of 88.31% (v/v). The two types of tropical microalgae have a potential as solid compound of bioethanol.
Supply chain management of coffee commodities
Authors: Ikhwana Andri
Published: September 2018

This study is aimed at describing the supply chain management of coffee commodity and the role of each of its elements. This study based on the ineffectiveness and inefficiency of coffee commodity business management which involves some elements that caused supply chain for the commodity has not been formed according to the expectation which in turn required a supply chain management able to fix the problem. The supply chain management is described qualitatively using supply chain basic model supported by integrated concepts of supply chain relationship, supply chain configuration, and supply chain coordination. The result of the study reveals that the supply chain management in coffee commodities includes suppliers, gatherers/manufacturers, exporters, and consumers. The distributors play the main role in determining product standards. The relationships between each of supply chain elements have been well established, utilized to distribute the products, and used as a feedback medium if there is a change in quality standards required in accordance with the needs of consumers. To ensure the sustainability of business activities in the supply chain, mutual commitment among the supply chain elements is required especially when it comes to determining the product quality standards and quantity.
A shortest route metaheuristic method for oil palm Fresh Fruit Bunch (FFB) transportation based on genetic algorithm: A case study in PTPN III Indonesia
Authors: Sembiring Meilita Tryana , Hadi M Zaky , Tanuwijaya Jessica , Budiman Irwan
Published: September 2018

Transportation plays a vital role in palm oil industry supply process because it provides the opportunity to continuously create supply operational efficiency and improve supply chain performance. The objective of this paper is to optimize route transportation process to represent a capacitated shortest route problem in palm oil FFB. A metaheuristic method based on genetic algorithm is designed as a model solution for the mathematical model. A case study in PTPN III Indonesia is presented to test the model effectivity and efficiency. The results indicate that the proposed metaheuristic method can find a better route rather than random method used by the company.
Design control system of auto air remaining machine based on programmable logic controller in the automotive manufacturing industry
Authors: Ardi Syahril , Cascarine Laurentia Tricilya
Published: September 2018

This research was conducted in one of automotive manufacturing industry of shock absorber. Air remaining is the process of preparing Shock Absorber to achieve ideal conditions i.e. ready to test the quality of its damping power. The trick is to remove the gas fluid contained in the cylinder so that the fluid remaining in the cylinder is just the oil fluid. If there is still a gas fluid left in the cylinder at the moment of the damping test, the Shock Absorber will experience momentary loss of power and this will greatly affect the quality of the Shock Absorber. The high frequency of repetition in the process of testing the quality of the damping power Shock Absorber on the Damping Force Tester machine due to not ideally Shock Absorber condition. This condition is one of them caused by the error of method in previous process that is air remaining process. Based on the above problems, then we research and design of new methods of operation of auto air remaining machine and design the control system. The method used is to utilize the gravity and the density of the two types of fluid, namely oil and gas to optimize the elimination process in Auto Air Remaining machine. The gas fluid can be perfectly eliminated. Control system design using Programmable Logic Controller (PLC). The Input and Output of PLC has used are 19 of inputs and 19 outputs. This method ensures the removal of the remaining air process.
Decision Support System for Islamic Couple Selection Using Fuzzy-AHP and WSM Method Based Web
Authors: Findawati Yulian , Qomariyah Nadifatul , Fitroni Arif Senja , Abdullah Dahlan
Published: September 2018

So far in Islamic marriage done by ta'aruf process which is the initial process of introduction in marriage. Therefore, the election system of Islamic couple is chosen to make it easier for couples to get the best partner for themselves. This system aims to provide partner recommendations with multiple options. Measurement in matchmaking using Fuzzy-Analytical Hierarchy Process (Fuzzy-AHP) and Weighted Sum Model (WSM) method because the basic concept of F-AHP method is a method used to know the action performed by comparison between several factors and some alternatives. FAHP is used in criteria weighting and WSM is used in sub criteria weighting. The results of weighting of each alternative in accordance with many criteria established, namely religion, property, heredity, physical, education, organization, marital status, expertise, and rank. The study compared the use of FAHP and WSM methods compared with AHP and WSM methods. And the result is Using AHP, found that Religion has the highest priority that is 0.4073 while using FAHP has the highest priority that is religion, organization, expertise, status, and rank with weight 0.172848. As for the results of alternative rankings, the use of fuzzy-AHP method is closer to the recommendation given by AHP.
Designing user interface on monopoly game application for learning fraction in elementary school by using goal directed design method
Authors: Istiqomah Ariningtyas Priyahita , Junaedi Danang , Kaburuan Emil Robert
Published: September 2018

Learning achievement is a measure of success after following the learning process. While the mathematics learning achievement of 5th grade elementary school students is low, as evidenced by the daily recapitulation data value of students who still score below the Minimum Exhaustiveness Criteria. According to the teacher the cause is the number of students who have not mastered the fraction material as the basis of mathematics material taught in class 5. So that required handling to achieve optimal results. According to research by Elvi Mailani, the Monopoly game used as a fractional math learning tool for elementary school children can have a positive impact by training children to hone their skills. But in this study, the media used less effective because it requires special handling to achieve goals and more optimal results. Based on these problems, a model of user interface for prototype application of fractional math monopoly game for elementary school students was designed. The goal directed design method is used as a design method that focuses on user goals. Based on the result of usability evaluation for the user interface model using QUIM obtained a percentage of 91.56%. So that the user interface model has fulfilled the usability element as a learning fraction media in Elementary school.
Experimental Study on Grinding Force of Zirconia Ceramics in Dry/Wet Grinding Environment
Authors: Zhang Junping , Wang Weidong , Li Songhua , Tao Han
Published: September 2018

The impacts of different linear speed of grinding wheel, grinding depth and workpiece feed speed with or without grinding fluid on grinding force were studied by plane grinding machining of zirconia ceramics. The impacts of different machining environment and grinding parameter on normal and tangential grinding forceswere studied by testing the grinding force during grinding with a force measuring device. The studies showed that the normal and tangential grinding forces decrease with the increase of the linear speed of grinding wheel and increase with the improvement of grinding depth and workpiece feed speed. The grinding depth has the greatest impacts on the normal and tangential grinding forces in dry grinding environment; while in wet grinding environment, the grinding depth exerts the greatest impacts on the normal grinding force and the linear speed of grinding wheel imposes the greatest impacts on the tangential grinding force. In addition, it was found that the normal grinding force in dry grinding is minor than that in wet grinding, that the tangential grinding force in dry grinding is greater than that in wet grinding, and that the grinding force ratio in dry grinding is lower than that in wet grinding.
Simulation of flow field in steam ejector and analysis of shock wave characteristics
Authors: Cui Yi
Published: September 2018

Fluent software is used to simulate the two-dimensional flow field in the steam ejector. The generation, development and end of shock in the flow field are analyzed. The influence of the shock wave characteristics on the ejector performance is discussed. The results show that the working back pressure in the steam ejector and the throat diameter of the nozzle all affect the position and intensity of the shock wave. When the shock wave ends prematurely or belatedly , it all affect the performance of the injector.
The Application of System identification method to characterize the performance of NiMH batteries in hybrid vehicles
Authors: Kandananond Karin
Published: September 2018

Nickel-metal hydride (Ni-MH) battery is one of the electric sources which is widely used in hybrid electric vehicles. As a result, it is important to understand the characteristics of Ni-MH battery which is connected to direct current machine in the vehicle. However, the crucial problem is the complexity of the vehicle system which deals with the charging and discharging process of battery in order to maintain the designated speed. The system is considered as a black box and the system identification method is utilized in to characterize the dynamic behavior of the system. The system inputs are battery voltage, armature current and state of charge (SOC) while the output is the speed of DC machine. However, the system identification method will not work properly if the available data available has played an importable role on the determination of the model. As a result, the data regarding all parameters were collected and transmitted to the data logger and used to construct different models. The results from the system identification method indicate that the autoregressive model with exogenous input (ARX) is the most appropriate model to explain the relationship between inputs and output. Therefore, the performance of hybrid vehicle related to the characteristics of Ni-MH batteries is elaborately characterized and this study leads to the effective maneuver.
Topological Optimization of Aircraft Frame Structures with the Variable Density Method
Authors: Li ying-lei , Cao zong-jie , Wang Zi-li
Published: September 2018

In this paper, a variable density topological optimization method is derived on the basis of Lagrange function, and the RAMP interpolation model is selected to optimize the frame structure of aircrafts with variable density method. For an example, the ordinary frame structure of the domestic planes is taken to illustrate validity of the presented method. The numerical model of the aircraft frames is obtained. The optimal design analysis of the model structural distribution and the weight loss requirement of the aircraft frame structures are realized. In conclusion, the structural distribution law of the topology optimization is summarized according to the topology optimization structures.