bluuebunny/crossref_metadata_2025 huggingface dataset:
Measuring critical thinking skills of 11th grade students on temperature and heat
Authors: Aminudin A H , Rusdiana D , Samsudin A , Hasanah L , Maknun J
Published: November 2019

Critical thinking is one of the essential skills of 21st century learning. Therefore, students are required to have these skills to be applied in physics learning. The study aims to measure students critical thinking skills on Temperature and Heat. Participants in this study are 29 of 11th grade students (10 males and 19 females) in the city of Bandung. The instruments used are five essay questions with five different indicators. The results show that the average value obtained is 31 with less categories. The conclusion, students’ critical thinking skills on Temperature and Heat are still less. Thus, there is a need for development in the learning process to improve the critical thinking skills of 11th grade students on Temperature and Heat.
Effectiveness of learning support of asset (assessment simulation test) for reconstruction physics conception
Authors: Darman D R , Suherman  , Anriani N , Wibowo F C , Faizin M N , Samsudin A , Suhandi A , Supriyatman  , Suherman A , Nurhaji S , Nurtanto M , Ramdani S D , Abizar H , Fawaid M , Nulhakim L , Siswanto
Published: November 2019

This researech to aims the effectiveness of ASSET (Assessment Simulation Test) to reconstruction physics conception and identification of student misconception. The study focused on the results of the concept of Optic concept and the quantity of misconceptions of students on the use of ASSET of one of University in Serang City, Banten, Indonesia. The data collected of research of the provision of understanding of the concept of using Four Tier test conducted after the implementation of learning. The method of research to Quasi Experiment. The subject of this research involves one group’s experimental group using “ASSET”. The highest level of comprehension is 76,67% Understanding Part 15,56% Understanding 5,56% Understanding level 2.22% and the lowest level of understanding at the No Answer level of 0%. It can be concluded that the significant effect uses of ASSET for reconstruction conception data from both groups indicate the improvement of the quantity of misconception of reconstruction physics conception.
Scaffolding learning model to improve habits of mind students
Authors: Susilowati E , Mayasari T , Winarno N , Rusdiana D , Kaniawati I
Published: November 2019

Habits of Mind (HoM) consisting of critical thinking, creative thinking, and self-regulation to build the character of students. The course syntax of scaffolding learning model consisting of orientation phase, training, task support, conceptual and procedural scaffolding, and metacognition and strategy scaffolding was discovered. This study aims to improve habits of mind students through scaffolding learning model. The research design used qualitative and quantitative data as mixed methods analysis. This research involves 92 participants of Physics Education Students taking Waves and Optic course, 46 students in the experimental class and 50 students in the control class. The result of this research, it can be concluded that the scaffolding lecture program is effective to improve students’ habits of mind.
Eleventh-grade student’s conceptions about temperature and heat
Authors: Nabilah F N , Maknun J , Muslim M , Samsudin A , Hasanah L , Suhandi A
Published: November 2019

The aim of case study is to identify student misconceptions of temperature and heat in senior high school. The learning process cannot be separated from the learning difficulties while students are learning Physics. Participants in this study are eleventh-grade senior high school students (14 male’s students and 16 female students) in Bandung. The instruments used were 12 multiple-choices questions on temperature and heat, embedded by the level of confidence of students answering questions. Six misconceptions about definition of heat and temperature,thermal expantion, substance phase, category transition in the form phase of objects, principle of conservation of energy and heat transfers are 73.35%, 38.35%, 20.0%, 95.0%, 58.35% and 45.6%.
Development of web based massive open online course on fundamental physics subject to increase students’ higher order thinking skill
Authors: Serevina V , Raihanati  , Sunaryo  , Andriana W
Published: November 2019

This study aims to develop massive open online course web vinnarrai.com as E-learning on fundamental physics subject and to increase higher order thinking skill of students. This research method used research and development by the ADDIE (Analyse-Design-Development-Implementation-Evaluation) model. The object of this study was 30 students in the physics education program of State University of Jakarta. The validation in this research used material expert validation sheet, media expert validation sheet, learning validation sheet, multiple choice questions, and higher order thinking skill questionnaire. Material expert validation results show 86.5 % (very good). Media expert validation results show 88.0 % (very good). Learning validation results show 89.0 % (very good). Based on the results of the investigation on the effectiveness of vinnarrai.com web on fundamental physics subject, obtained N-gain equal to score of 0.72 in high category. This shows the increased score of higher order thinking skill participants. Based on data above, this study showed that the development of Massive Open Online Course on fundamental physics subject can increase high order thinking Skill of Students.
Analyze of conceptions and misconceptions on pre-service teacher about light
Authors: Wahyuni A S A , Rustaman N , Rusdiana D , Muslim
Published: November 2019

The purpose of this study is to define a description of the various conceptions and misconceptions of pre-service teacher about the concept of light in basic physics courses. This research was conducted on 96 students of basic physics teacher candidate in one of state universities (PTN) in Makassar. The mixed method was used in this study. Data collection in this research is through observation, test, analysis of test results, limited interviews, and analysis of data by quantitative and qualitative. The result of this research is found the misconception of physics pre-service teacher about the physics concepts, especially about the light concept. This shows that the low understanding of the concept of pre-service teacher to the basic concepts of physics, causing misconception. Therefore, that misconceptions are define an information to develop a continuous research that can contribute to improving the quality of teachers’ candidates, especially physics teachers who will give a positive impact on improving the quality of education, especially in Indonesia by developing a programming of basic physics course oriented conceptual change to eliminate a misconception on physics teacher candidates.
Textbook design based on multiple intelligences with the theme of earth protector
Authors: Liliawati W , Utama J A , Ramalis T R , Waslaluddin  , Rahmansyah M A , Rochman A A
Published: November 2019

This study aims to describe the design of teaching materials of earth and space science subject on theme of Earth protector-based on multiple intelligence for high school students. The whole process consist of three steps, namely Define, Design and Develop. Our work will focus on design stage that consists of four tiers: constructing criterion-referenced, media selection, format selection and initial design. Our teaching material product is accommodating two integrated models, which are webbed and threated model. The webbed model is built based on twenty-eight Basic Competencies in the 2013 curriculum with theme on Earth Protector. Meanwhile, threated model underlies the meta-cognitive arrangement of book with that accommodate multiple intelligences. This teaching material integrates five subjects, namely Natural Sciences, Social Sciences, Mathematics, Islamic Education and Bahasa.
The implementation of problem based learning model with the science writing heuristic approach to increase mastery of concept and critical thinking skill at junior high school student on simple machine
Authors: Muslim  , Hakim M I , Meidawati R
Published: November 2019

This research aims to know the increase mastery of concept and critical thinking skill through problem based learning model with a science writing heuristic approach on simple machine. Methods of this research using pre-experimental with one group pre-test - post-test design. The subject of this research is student grade VIII at one of Junior High School in Bandung. Instrument that used for this research is a test form of mastery of concept and critical thinking skill. Improvement mastery of the concept and critical thinking skill is measured by the normalized gain. The result shows an average gain of N-gain the mastery of concept is 0.59 with fair category. And the critical thinking skill is 0.63 with fair category. The response of students to the implementation of problem-based learning models with the Science Writing Heuristic approach shows that almost all students gave positive responses. Thus, the increase of mastery of concept and critical thinking skill and at students on the simple machine through the implementation of problem based learning model with the approach science writing heuristic has improved. Student responses to the learning model that is implemented positively.
Development of basic physics experiments based on science process skills (SPS) to enhance mastery concepts of physics pre-service teachers in Melde’s law
Authors: Nugraha M G , Utari S , Saepuzaman D , Solihat F N , Kirana K H
Published: November 2019

This study aims to develop basic physics experiment (BPE) to improve the mastery concept in the Melde’s law. Research and development (R&D) was conducted by involving physics pre-service teacher as many as 18 students in the first year and 15 students in the second year as the research sample. Experiment were developed through the development of Science Process Skill (SPS)-based student worksheets which has been reviewed and judgment by expert, which included observing, communicating, classifying, measuring, inferring, predicting, identifying variables, constructing hypotheses, operationally defining variables, designing experiment, acquiring and processing data comes to a conclusion. The results of the first-year study showed that student’s SPS had not been trained optimally, students were still having difficulty in observing, determining experiment variables, inferring and hypotheses. This results in a low mastery of the concept in the Melde law material with a mean class score of 55.56. In the second year, the development of experiment activities was carried out by emphasizing the basic practice of SPS in the beginning of the lecture through simple experimental topics to a more complex. Based on the data processing of the second-year research showed an increase in student process science skills (SPS) and there was an increase in mastery of concept with a mean grade of 73.22. Based on the results of the study, it can be said that the development of basic physics experiment based on SPS that have been carried out can improve the mastery of the concept of in Melde’s law.
Voltage Harmonic and Interharmonic Detection Method for DC Microgrid based on Hanning Window Interpolation
Authors: Hanlin ZHU , Lijun TIAN , Dayong QI , Hui GAO
Published: November 2019

With the development of power electronics technology and the increasing DC sensitive load, DC microgrid is an important direction for future power distribution. At present, there are few studies on the power quality of DC microgrids. This paper introduces a DC voltage harmonic and interharmonic detection method suitable for DC microgrid. The voltage of the DC microgrid is divided into DC voltage and harmonics and interharmonics, and they are studied separately. For the DC voltage, use the regression equation to represent and restore it. For harmonics and interharmonics, the method of windowed Fourier transform is used for analysis, and the quadratic interpolation method is used for correction.Through simulation, the detection and reduction of DC voltage harmonics and interharmonics under various operating conditions are analyzed. Finally, the feasibility and accuracy of this algorithm are verified.
Preparation of Flower-Like Zn-Al Layered Double Hydroxides as Anode Materials with Improved Electrochemical Performance
Authors: Yan Xinyu , Chen Zexiang , Wang Yan , Zhang Jijun , Zhou Zhiyu , Lv Huifang
Published: November 2019

In this account, a facile approach for preparation of 3D self-assembled flower-like Zn-Al layered double hydroxides (Zn-Al LDHs) through a one-step hydrothermal method is demonstrated, and the resulting material is successfully utilized as negative electrodes of next-generation Zn secondary batteries. The flower-like Zn-Al LDHs possess larger specific surface area and better ion diffusion channel. Due to the unique flower-like nanostructure, the resulting flower-like Zn-Al LDHs exhibit higher charging efficiency and better cycle performance. This is concluded from the combined data of serial electrochemical tests based on galvanostatic charge-discharge tests and cyclic voltammetry (CV) tests. The galvanostatic charge-discharge tests reveals that flower-like Zn-Al LDHs maintained 95.7% of the initial specific capacity after 600 cycles.
Study on Characteristics of Different Internal UHF Sensors in GIS
Authors: Duan Y B , Zhang H , Yong J , Yang B , Hu X L , Sun X B , Meng H L , Feng X Y , Xu Y P
Published: November 2019

The crucial point of the UHF detection is the UHF sensor, which affects the sensitivity and anti-interference ability of the UHF detection. In this paper. the introduction of 5 different kinds of internal sensors of the Ultra High frequency (UHF) technology used to monitor the PD in the GIS was made in detail. With comparion of the external sensors, the anti-interference ability of internal sensors is much better. In order to evaluate the property of different sensors more precisely, several indicators are introduced in this paper. Furthermore, some unsolved issues about the sensot inside the GIS are presented for researchers to solve.
Study of Voltage Distribution and Radial Electric Field under Different Pollution Conditions of 500kV MOA
Authors: Wang Hui , Song Simeng , Yao Weijia , Zang Yiming , Qian Yong , Jiang Xiuchen
Published: November 2019

The surface of the porcelain sleeve will be polluted by local environmental pollution and weather factors such as frost, rain and snow, because of the 500kV MOA is generally arranged outdoors. The surface flashover problem of the porcelain sleeve surface caused by contamination is similar to that of the insulator surface. It is a resistor column with three sections connected in series inside the arrester. The influence of surface contamination on the voltage distribution of the internal resistor and the radial electric field between the resistor and the porcelain sleeve remains to be studied. In this paper, ANSYS is used to establish a two-dimensional axisymmetric simulation model for the surface contamination of 500kV zinc oxide arrester. The electric field distribution of the surface of the arrester is cleaned, evenly polluted and the local drying zone appears. The results show that the uniform contamination is inside the arrester. The electric field has little influence, and the local drying zone will form a locally excessively high radial electric field between the resistor and the porcelain sleeve. Under the reference voltage, the radial electric field exceeds the corona starting field and causes corona discharge, and the acceleration resistor Deterioration of the sheet and the dielectric; the voltage of the resistor piece near the local drying zone is increased to a certain extent, which also accelerates the aging of the resistor chip and jeopardizes the safe and stable operation of the arrester
UPIoT Intellisense Laboratory Scenarios
Authors: WANG S. J. , FU X. F. , XU P. , He T , SONG H.
Published: November 2019

To improve the quality of intellisense facilities, UPIoT intellisense laboratory, the very first lab of UPIoT field, is found. The principles of laboratory including standard test, defined procedure, transparent process, shared information, open construction and international practice. Based on the principles, five main research directions are confirmed. The omnibearing performance verification of intellisense facility and performance criterion and verification of new facility are the cores of laboratory. The laboratory is the quality control basis of UPIoT.
Development of an experimental setup for studying heat removal by a dispersed flow
Authors: Zakharenkov A V , Demidov A S , Tupotilov I A , Shteling V S
Published: November 2019

The work provides description of a new test bench for the cooling efficiency of a working area with a high energy density using a two-component dispersed coolant flow. The pneumatic atomizer design and a scheme of the working area, cooled by a two-component dispersed flow are described. A measurement method of the working area wall temperature is proposed. Arrays of primary test data are obtained for coolant operating parameters p
water = 2, 0·105 Pa, p
air = 1, 6·105 Pa, G
water = 0, 042 kg/c; G
air = 1, 6·10−3 kg/c.
Development of the experimental stand for research heat removal with a high power density by a dispersed heat carrier flow
Authors: Komov A T , Sherbakov P P , Ilyin V V , Smorchkova Yu V , Shteling V S
Published: November 2019

A schematic and measuring diagram of an experimental stand has been developed for research heat removal with a high power density by a dispersed heat carrier flow. Methods for measuring thermophysical and electrical parameters are determined. The design of the experimental chamber is developed. The scheme and design of the induction heating system and steam condenser have been developed. An experimental setup for research the evaporation time of a droplet has been created. An experimental study of the droplet evaporation time was carried out. The experimental data were processed and compared with the theoretical dependence.
Acoustic impact on electric discharge parameters during sterilization of freeze-dried products
Authors: Ya Asadullin T , Galeev I G , Sofronitskiy A O , Gizeev M M
Published: November 2019

The possibility of using a gas discharge plasma for sterilization of freeze-drying products directly in the process of their vacuum packaging for long-term storage is considered. An alternating current electrical discharge was used as a source of sterilizing action. In order to increase the homogeneity of the processing of the products, sound waves were applied to the electrical discharge. The effect of acoustic effects was investigated in the pressure range from 10 to 100 Torr, and the sound frequency from 50 to 400 Hz. A noticeable effect of sound waves on the discharge behavior was identified and optimal conditions were determined for increasing the uniformity of the sterilizing effect on the processed products.
Determination of the recovery heat flux at superfluid helium film boiling in different conditions
Authors: Puzina Yu Yu , Kryukov A P
Published: November 2019

The calculation of the recovery heat flux density is considered for different conditions to investigate heat mass transfer processes. System of equations is based on the methods of continuum mechanics and molecular kinetic theory. Pressure distribution in the liquid is determined by the hydrostatic difference. At the vapor-liquid interface the Laplace formula is used. The vapor pressure in the film is determined by the non-equilibrium effects in the vapor near the interface. Heat transfer in a liquid is described by the Gorter-Mellink semi-empirical theory. Experimental data on the boiling of superfluid helium under various conditions are interpreted based on the formulated mathematical model. For all cases in the considered range of parameters, the qualitative and in some cases quantitative agreement between the calculated and experimental values of the recovery heat flux were obtained.
The application of RF inductively coupled plasma torch for the enrichment of natural quartz
Authors: Grishin Yu M , Miao L
Published: November 2019

Numerical simulations of the dynamics of the heating of polydisperse quartz flow in the plasma and the thermal stresses arising in quartz particles are performed. As a plasma source, an RF inductively coupled plasma torch with axial supplies of plasma and sheath gases is considered. The RF inductively coupled plasma torch with 3-turns works at a generator frequency of 3 MHz and an electrical power up to 10 kW. Polydisperse quartz flows (carrier gas and quartz particles) are introduced into the plasma after discharge zone through the azimuthally symmetrical annular channel at an angle of 60° to the axis of the plasma torch. Pure argon and its mixtures with hydrogen (with a volume fraction of up to 5%) are considered as working gas.
Probe characteristics of probes from different materials in glow discharge in helium
Authors: Prokhorova E I , Platonov A A , Ignakhin V S , Nazarov A I
Published: November 2019

Dust plasma is of particular interest due to the wide technological application and extraordinary properties. Probe method is often used for plasma diagnostics [1, 2]. At the same time, a probe is similar to a dust particle and there are emission streams on its surface, which make corrections to determination of plasma parameters. Despite essential development of the probe theory, when calculating plasma parameters for experimentally received volt-ampere characteristics emission of electrons is not considered, in many respects because of serious complication of the mathematical apparatus. The authors present the probe characteristics of probes from different materials in glow discharge in helium. The analysis of the chemical composition of the probe material is made. It has been shown experimentally that the material of the probes and the state of their surface (degree of roughness) have practically no effect on the results of probe measurements.
Method and device for applying protective coatings to heat exchange tubes of system heaters
Authors: Chugunkov D V , Seyfelmlyukova G A , Skurikhina A D
Published: November 2019

During exploitation of heat exchange equipment, the inner surface of tubes is exposed to the working environment negative effects, that leads to corrosion, abrasion and destruction. Currently, an urgent task is to develop a technology for recovery and protection of heat exchange tubes without complete replacement of the tube bundle, that will allow to reduce repair costs and improve the heaters’ efficiency. Existing devices for applying protective coatings have a number of flaws: bulkiness, low mobility, the need to use a 380 V network, the inability to use photopolymers. All these factors limit possibility to use these methods and devices. In order to eliminate such drawbacks, the present work developed a special device, allowing to protect and restore damaged surfaces of heat exchange tubes.
Model of sputtering of binary homogeneous targets by light ions bombardment
Authors: Manukhin V V
Published: November 2019

An analytical model of the sputtering of binary homogeneous targets by light ions bombardment has been developed, an analytical formula has been obtained, which makes it possible to calculate the total and partial sputtering coefficients of a binary (multicomponent) target by light ions bombardment. The calculation results are in good agreement with the experimental data. The patterns of preferential sputtering of two-component materials at low energies of bombarding ions are revealed.
Experiments with tin liquid-metal capillary porous system in the PLM device
Authors: Budaev V P , Fedorovich S D , Lyublinsky I E , Vertkov A V , Van Oost G , Martynenko Y V , Lukashevsky M V , Karpov A V , Lazukin A V , Yu Marchenkov A , Gerasimov D N , Gubkin M K , Shestakov E A , Voinkova I V , Gvozdevskaya D S , Rogozin K A , Zakletsky Z A
Published: November 2019

Plasma tests of a tin capillary-porous system (CPS) were carried out on the PLM plasma device. This CPS is made similar to the lithium CPS used in experiments in tokamaks T-10, T-11M. The CPS system was immersed in the PLM plasma device and tested for 3 hours in a stationary helium discharge with plasma load of 1 MW / m2. The tin CPS has not damaged after such plasma load suggesting it as plasma facing component in fusion reactors and plasma engines.
The influence of the working fluid type on the parameters of the ion engine
Authors: Laharev D A , Lukyantsev D S , Tupotilov I A , Yamaev A M
Published: November 2019

Nowadays, the level of technological progress, the foundations of which were laid in previous decades, has made it possible to practically master the use of near-earth orbits and conduct separate research trips beyond them. Further steps, including expanding the functionality of space vehicles in near-Earth orbits, the creation and regular operation of a lunar space base, large-scale planetary and other bodies of the solar system exploration, and sounding of deep space, requires, first of all, a sharp increase in the capabilities and efficiency of space transport systems. A further increase in the flow rate of the working fluid requires an increase in its specific energy content, that is, conversion to a plasma state, which is implemented in ion engines. In ion engines, ion beams are accelerated in an electric field organized by electrodes. The volume charge in the accelerating gap is not compensated; this serves as one of the restrictions on the current density in such a beam. In the present work, we took hydrogen, deuterium, helium, nitrogen, argon, krypton, xenon as the working fluid, for which the dependences of the optimal ion emission current density on the distance and voltage between the electrodes of the accelerating gap, breakdown voltage of distance between the electrodes, specific thrust of the specific impulse, specific impulse of the mass number of ions and others were calculated, and the most promising and effective working fluid was determined.
Influence of True Diffusion Coefficient on Hydrogen Diffusion in Tungsten in the Field of Defects
Authors: Pisarev A , Giniyatullin B
Published: November 2019

Numerical calculations of thermal desorption spectra, permeation, and accumulation of hydrogen in radiation damaged tungsten have been made using two approximations for the diffusion coefficient: the commonly used approximation of Fraunfelder and that of Heinola, which he proposed to describe only the most high temperature data of Fraunfelder.
Investigation on gas plasma and liquid plasma treatment for polyether ether ketone (PEEK) surface for wettability enhancement
Authors: Vira Theng Saw , Zaaba Siti Khadijah , Mustaffa Mohammad Taufiq
Published: November 2019

The results of liquid and gas plasma treatment on polyether ether ketone PEEK surfaces are reported. The experiments were conducted by using variation of treatment time (5 s to 60 s) using Helium as its working gas. The results were obtained by measuring the water contact angle (WCA) and the studying the surface morphology of the PEEK surface. Comparisons of WCA and Scanning Electron Microscopy (SEM) analysis were conducted for samples which undergone gas plasma treatment and liquid plasma treatment. After gas plasma treatment, WCA of the PEEK surface decreased from 65° to 21°. Results of WCA for liquid plasma treatment showed decrement from 65° to 45°. Images from SEM showed PEEK surface area after gas and liquid plasma showed surface area increment of 40% for gas plasma and 20% for liquid plasma. The decrement of WCA and increment of surface area showed that PEEK surface properties changed from hydrophobic to hydrophilic via wettability enhancement.
Development of an Affordable, Accessible, and Available (3As) IoT-Enabled Motion Analysis System for Stroke Recovery Monitoring – An Introductory Approach
Authors: Chong Yu Zheng , Ng Peng Yee
Published: November 2019

According to the United Nations Sustainable Development Goals (SDGs) formulated in 2015, there are seventeen (17) identified goals aimed to be achieved by 2030. This project was focussed on SDG 3, SDG 10, and SDG 11 [1]. The developed motion analysis system adopted principles of Affordability, Accessibility, and Availability of this system for monitoring of stroke patients who are undergoing physical therapy (PT). Such system will enable stakeholders involved in rehabilitation of these communities to monitor the progress of PT regime that will be vital in determining efficacy of the regime. Furthermore, the proposed system has the capabilities of remote monitoring, and data acquisition via the IoT platform. The cost of developing this modular system was less than RM 1,000 (approximately USD 243) [2]. Hence, it is anticipated that this project will be a stepping stone towards 3As of motion analysis for stroke patients.
The Characterization Of Bario Rice Starch-nanoHA Scaffolds using SEM and Dielectric Measurement
Authors: Roslan M.Riza , Nasir N.F.Mohd , Khalid M.F.Abdul , Cheng E.M , Amin N.A.M. , Mohammad N. , Beh C.Y. , Majid M.S.A.
Published: November 2019

Bone tissue scaffold had been ventured for over the decades as a solution for bone failure and trauma. Starch is the most common natural polymer that has been used as a biomaterials and a good candidate for scaffold fabrication as there are many resources of starch in Malaysia. Native starches may contribute differently in their structure in terms of the amylose content, interactions between granules, swelling ability and solubility in which those differences can be mainly due to the botanical origin. In Malaysia, there are various resources of rice starches. Here, the Bario rice starch from Sarawak was used to fabricate the scaffold via solvent casting and salt leaching technique. Bario rice is usually collected from various sources and variety which may contribute to different physical affect in comparison of using other type of rice. From the study, the morphologies and microstructures of the scaffold were evaluated using Scanning Electron Microscopic (SEM) and this showed no trend of pore size increment when starch percentage varied. Then, the dielectric properties were obtained via the values of dielectric constant and dielectric loss which are another type of indirect measurement to study the porosity of the scaffolds. The porosity has the value of the dielectric constant and the loss air matrix whereby this air matrix is represented by the pore in the scaffold. Here, the results were consistent with the observation made through SEM. Thus, the relationship between the porosity and the dielectric properties of the Bario Rice Starch-nHA tissue scaffolds had been established and there were no particular pattern could be concluded by using Bario rice for this scaffold.
Computer Aided Diagnosis of Eye Disease for Diabetic Retinopathy
Authors: Ng Wei Sheng , Mahmud Wan Mahani Hafizah Wan , Huong Audrey Kah Ching , Kairuddin Wan Nur Hafsha Wan , Gan Hong Seng , Izaham Raja Mohd Aizat Raja
Published: November 2019

Diabetic retinopathy (DR) is one of diabetes complication that could cause the vision loss, where it is caused by the damage of the blood vessels at the back of the eye. Due to this, regular eye check-up and timely treatment is needed. However, the lack of specialized ophthalmologists together with associated higher medical costs makes regular check-up costly. Therefore, any application of the technologies such as Computer Aided Diagnosis (CAD) system that could help in analysing DR efficiently in its early stage may help this current situation. Although CAD systems were developed before, but the graphic user interface for user is not developed for the ease of uses for everyone and not just limited to professional. So, in this study, a system is created in order to help the doctor to reduce their burden on the job daily and the false negative rate for the benefit of the patient. The input of the system is the Retinal fundus images (RFI) from STARE database, and the system was built with the ability to enhance and process the image for confirmation of DR. In addition, the system will help to extract out the important features based on Grey Level Co-Occurrence Matrix (GLCM) and classify it using artificial neural network (ANN) whether the patient is associated with the characteristics of DR. Also, the system will be easy to use to everyone as it will have its own graphic user interface to make it clear to everyone not just professionals so that the image from the RFI can be inserted and the result will come out in a short duration of time. The developed system able to achieve as high as 88% sensitivity, 80% specificity and 84% accuracy.
Number of Screws Affecting the Stability and Stress Distributions of Conventional and Locking Compression Plate: A Finite Element Study
Authors: Tuminoh Herman , Afandi Mohamad Hafiz Mohamad , Gan Hong Seng , Kadir Mohammad Rafiq Abdul , Ramlee Muhammad Hanif
Published: November 2019

The effectiveness of malleolar fracture fixation is still questionable. Internal fixator is the one of the treatment for treating this fracture. However, the analysis of various type of internal fixator is still lacking in the literature in terms of biomechanical characteristics and behaviour. Thus, the aim of the study was to compare the stability of locking compression plate (LCP) and one third tubular plate (OTT) in different configuration of screws. Computed Tomography (CT) images of bone was used to develop 3D model of fibula bone. The plate was constructed in Solidworks software and number of screws used were 3 and 5. Further, finite element study was conducted for both model. For LCP, the highest von Mises stress (VMS) observed at the plate for 3 screws was 484 MPa, whereas for 5 screws plate was 667 MPa. Besides, for OTT, the highest VMS at plate observed for 3 screws was 300.5 MPa, whereas for 5 screws plate was 127.5 MPa. Based on the results, it can be noted that the usage of 3 screws can causes a low VMS at plate compare to 5 screws. However, the relation is valid for LCP. For OTT, 5 screws constructs gave a low VMS than 3 screws constructs.
Classification of Acute Leukemia Based on Multilayer Perceptron
Authors: Halim Nurul Hazwani Abd , Mashor Mohd Yusoff , Hassan Rosline
Published: November 2019

In general, various artificial neural network have been applied in many areas such as modelling, pattern recognition, signal processing, diagnostic and prognostic. In this paper, artificial neural network are used to detect and classify the white blood cell (WBC) inside the acute leukemia blood samples. There are 25 features have been extracted from segmented WBC, which consist of shape, color and texture based features. Then, it have been fed up as the neural network inputs for the classification process in order to classify the segmented regions into two classes either B or T. The training algorithm for MLP network is Levenberg-Marquardt (LM). The MLP network achieves the highest testing accuracy of 96.99% for 4 hidden nodes at state of 5 by using the overall 25 input features. Thus, MLP network trained by using LM algorithm is suitable for acute leukemia cells detection in blood sample.
Optimization of Irrelevant Features for Brain-Computer Interface (BCI) System
Authors: Ying Ong Zhi , Awang Saidatul Ardeenawatie binti , Vijean Vikneswaran A/L
Published: November 2019

The brain is the most important body part for human. The brain controls all activities of the body such as movement, imagine, and response. Therefore, it is believed that the signals which collected from human scalp contain a lot of useful information. This useful information known as features can be extracted by applying advanced signal processing. Then, the features used for a brain-computer interface (BCI) system. However, the most suitable and relevant features for the BCI system still not investigate. In this paper, ten healthy subjects were involved in data collection. Threshold method, notch filter and wavelet decomposition were applied during pre-processing. Then, the signals were normalised. Hilbert-Huang Transform (HHT) and Power Spectral Density (PSD) were implemented. The features such as statistical-based features, approximate entropy (ApEn), sample entropy (SampEn), fuzzy entropy (FuzEn), permutation entropy (PermEn), distribution entropy (DistEn), Hjorth parameter, and Hurst exponent (HE) were extracted from PSD and HHT separately. Genetic algorithm (GA) and reliefF were carried out to select the most suitable and relevant features for the BCI system. The prediction rate before and after feature selection were compared. The performance after feature selection is improved in term of prediction rate and training time. The best classifier, in this case, is the bagged tree which can achieve 99.30%.
Energy saving mechanism in fog assisted IoT enabled health monitoring framework
Authors: Pani Luina , Misra Chinmaya , Abdullah Azian Azamimi , Dash Satya Ranjan
Published: November 2019

This proposed research work discusses fog assisted IoT enabled health monitoring system performance. This system support local processing nearer the client machine for faster service and removing redundant data. This architecture is suitable for heavy traffic health data monitoring system like old or child monitoring or fitness care monitoring system. After processing huge data, only filtering data will be forwarded to cloud for processing. To transfer the huge amount of health monitoring data form IoT layer to Data Management and Processing Layer (DMPL) consume lots of energy. To minimize the energy requirement in the fog assisted DMPL layer, we adopt sleep mode operation and batch transferring data packet transfer technology. This paper studies the effect of sleeping mode on mean delay, number of data packets in the buffer and probability of blocking. The results show that proposed approach saves energy and effective framework for fog assisted health monitoring framework.
Characteristics of the Extreme Rainfall over Indonesian Equatorial Region based on the Madden-Julian Oscillation Index Data Analysis
Authors: Hermawan Eddy , Norfahmi Siti Hairunnisa , Suryantoro Arief , Harjana Teguh , Trismidianto  , Purwaningsih Anis , Setyawati Wiwiek , Azizah Siti
Published: November 2019

Indonesia Maritime Continent (IMC) is one the most important region at the equator which affected by many atmospheric phenomena, especially Madden-Julian Oscillation and Monsoon. Asian Winter Monsoon causes the increasing of rainfall in several places in Indonesia in December-January-February (DJF), and since MJO related to a propagation of convective cloud, somehow it affects the rainfall variability in equator, especially over Indonesia. Interaction of both phenomena simultaneously bring rainfall is increasing in Indonesia, especially in Western Part of Indonesia. Therefore, a research about the impact of MJO in rainfall especially in Bandung and other cities over Indonesia is important. This study aims to investigate impacts of MJO events on the rainfall variability in Bandung and other cities focusing when Asian Winter Monsoon (December-January-February/DJF) for period of DJF 2002/03 – DJF 2012/13 passing over Indonesia. The results show that from 10 MJO events in period DJF 2002/03 – DJF 2012/13, the event increased the rainfall continuously in phase 3, phase 4, and phase 5. In phase 3, the increasing happened in every station except Supadio in Pontianak with the total precipitation > 30 mm/day. The condition of rainfall in phase 4 fluctuates in every station, but with the dominant increasing in Equator. In phase 5, the decreasing of rainfall happened in North of the Equator and Equator, while in South of Equator, the rainfall in Cengkareng Station in Jakarta increased about 20% but decreased about -42% in Bandung Station.
Kinetics of Reducing Sugar Formation from Coconut Husk by Subcritical Water Hydrolysis
Authors: Alimny Alfain Noerdin , Muharja Maktum , Widjaja Arief
Published: November 2019

Coconut husk hydrolysis using subcritical water (SCW) with N2 as pressurizing gas was carried out in a batch reactor at temperature of 150 °C-190 °C, at pressure of 60-100 bar and the reaction time from 20-60 min. The effect of SCW pretreatment could reduce lignin and produced reducing sugars. The highest TRS (total reducing sugar) yield was 0,4904 at 170 °C, 80 bar, and the reaction time of 20 min. Reducing sugars concentration increased when temperatures rised from 150 to 170 °C. However, reducing sugar concentration decreased at temperature above 170 °C. The decrease of reducing sugar was due to degradation of reducing sugars into its degradation products. A first-order reaction model was determined to describe the reaction rate constant of the formation of reducing sugar and its degradation products. Kinetic parameters were obtained by fitting the proposed equation with the experimental data. The reaction rate constant increased when temperature increased from 150 to 170 °C, but then decreased when the temperature increased above 170 °C. Activation energy was also determined based on the Arrhenius equation.
Experimental Test of the Effect Wet Ethanol on Decreasing Emissions Exhaust in EFI Gasoline Engine with EGR System
Authors: Arief Alfi Ardian M , Ardian Alfi , Sinaga dan Nazarudin
Published: November 2019

The increase in the number of vehicles results in increased fuel consumption and air pollution. This also affects the more depletion of fossil fuel availability. An increasing number of these vehicles contribute to air pollution in urban areas. Hazardous substances such as NOx (Nitrogen Oxide), CO (Carbon Monoxide), and HC (Hydrocarbon) are harmful to health. In order to reduce the emissions of CO and HC, wet ethanol is one of the solutions to overcome these problems. Besides ethanol can be obtained from materials that are renewable. In fact, wet ethanol has a value of higher octane and higher oxygen content than gasoline. Blending both the fuel is expected to reduce air pollution. The purpose of this research is to obtain the best premium and wet ethanol percentage for lowering emissions of CO and HC. The fuel used is gasoline (88 octane number) and the wet ethanol (109 octane number). The percentage of wet ethanol blended into the fuel is in the range of 5% to 15%. Experiments conducted an engine speed of 2500 to 4000 rpm with an interval of 500 rpm. This study investigates the effects of wet ethanol and premium blends and the use of EGR (Exhaust Gas Recirculation) against exhaust emissions on a gasoline engine with EFI systems (Electronic Fuel Injection). From the results of this study is found that the exhaust gas temperature increases in the increase of engine speed. The addition of EGR reduces the exhaust gas temperature. The increase in BSFC (brake specific fuel consumption) without the largest EGR at we15 is 3.36% at 0.38 kg/kw. Hour, while the decrease in BSFC with the largest EGR at we5 is 17.61% at 0.30 kg/kw. Hour. Wet ethanol and gasoline blends cause a decrease in emissions of CO and HC. With a 15% wet ethanol blend, CO and HC emissions can be reduced to 60.23% and 44.30%, respectively. However, adding 15% wet ethanol into gasoline fuel increases 34.66% of CO2.
Maximizing Power Tracking of an Offshore Wind Turbine Using Perturb and Observe Method
Authors: Ardiles R , Hasan S , Pane Z , Suherman S
Published: November 2019

As fossil energy sources have been limited, renewable energy sources are now being explored. The wind energy is potential in the coastal area of Indonesia such as Nias island. There is only 0.5% of the potential energy sources in this area has been used. This article studies the wind energy prospect and simulates the implementation of maximum power point tracking based on perturb and observe method for permanent magnet synchronous generator of wind energy converter. Study shows that the method is able to enhance output power of wind energy generator about 7.22 % in average with shorter tracking time of 0.67 s.
Comparison of Hi-Art Tomotherapy Machine Outputs Using AAPM TG-148 and IAEA TRS 483 Codes of Practice
Authors: Firmansyah O A , Firmansyah A F , Sunaryati S I , Wibowo W E
Published: November 2019

Comparison of Hi-Art Tomotherapy Machine Outputs using AAPM TG-148 and IAEA TRS 483 Codes of Practice. This paper describes a short history and technological aspect from a Hi-Art tomotherapy machine. The comparison between the tomotherapy machine and conventional linear accelerator machine in the technological aspect and therapy features was also described. There are two codes of practice to determinate the absorbed dose to water from the Hi-Art tomotherapy machine, The AAPM TG-148 and IAEA Technical Report Series No. 483. Determination of the absorbed dose to water was carried out at the machine specific reference condition by using the ionization chamber type of PTW TW 30013 SN 6367 volume 0.6 cc, and electrometer PTW Webline T10022/268. The results obtained show that the value of absorbed dose to water using the AAPM TG-148 was 8507 ± 2.4 mGy/minute and while using the IAEA TRS 483 the value of absorbed dose to water was 8485 ± 2.4 mGy/minute. The comparison result of the determination of the absorbed dose to water using AAPM TG-148 and IAEA TRS 483 protocol has a deviation of 0.2%.
Effect of Temperature in Ionic Liquids Pretreatment on Structure of Lignocellulose from Corncob
Authors: Rofiqah Umi , Kurniawan Aditya , Nugroho Aji Ridwan Widi
Published: November 2019

Biomass is a potential source of cellulose contained in nature in abundant amounts of either agricultural waste or plant. Corncob is one of biomass derived from waste of agricultural. High content of cellulose from corn cobs have the potential to be processed into glucose which is then fermented to produce bioethanol. Lignin contained in the corn cobs must be removed to produce high glucose levels, through choline acetate as ionic liquid in pretreatment process. Pretreatment process was done by adding choline acetate (ChoAc) as ionic liquid (IL) with a certain ratio between biomass to IL. The pretreatment was carried out at 90°C, 120°C and 150°C of temperature with a reaction time of 20 hours. The highest lignin reduction and index of crystallinity (CrI) is 36.05% and 25.74% respectively, obtained in a pretreatment that uses 0.3 of biomass to IL ratio and 150°C of temperature. This reduction of lignin was aimed to obtain high yield bioethanol in the fermentation process due to high yield of of glucose. And the greater the crystallinity index, the easier the enzymes or microorganisms will degrade glucose into bioethanol.
Experimental and computational study on heat transfer of a 150 kW air-cooled eddy current dynamometer
Authors: Sinaga Nazaruddin , Syaiful  , Yunianto B , Rifal M
Published: November 2019

The air-cooled eddy current dynamometer is widely used in the measurement of engine performance. However, the load capacity of this device will significantly decrease when operated continuously as a result of temperature rise. To resolve this issue, it needs a high rate air cooling system. Since the heat transfer mechanism is real complicated and has several parameters affecting the cooling rate, it is advantageous to examine the phenomena theoretically, before designing a dynamometer. The primary objective of this study was to validate the numerical simulation modeling against experimental measurement results. The study was conducted with an existing 150 kW eddy current dynamometer that operates at several rotating speeds. Numerical calculation was validated with experimental results by varying turbulence models and dynamometer load. The finite volume method, facilitated by ANSYS FLUENT® software, was used to solve the problem. It has been found that the Spalart-Allmaras model is in good agreement compared to the experimental results. Hence, it is concluded that the computational model might be used as the reference to calculate the effect of dynamometer geometry parameters, and other operational variables, for getting the optimum design of cooling part of the dynamometer.