bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effects of Coil Pitch Spacing on Heat Transfer Performance of Nanofluid Turbulent Flow through Helical Microtube Heat Exchanger
Authors: H. Rasheed A. , Alias H. , D. Salman S. 
Published: March 2021

This article provides Numerical simulation on forced convective heat transfer performance of Nanofluid flowing through copper helical microtube of inner diameter of 1.5 mm with different pitch using ANSYS-FLUENT 18.0. The simulation was performed for water, CuO/water, Al2O3/water Nanofluid with 1-2% volume concentration and different pitch of microtube (10, 14 and 18 mm) for turbulent flow regime of Reynolds number varied 5000 to 20000 and governing equations of mass, momentum and heat transfer were solved simultaneously, using the k-e two equations turbulence model. Based on the obtained results, regardless of the concentrations used, the nanofluids exhibited a higher transfer rate than water. This is mainly attributed to the nanoparticles that are in the used nanofluids. The friction factor and the heat transfer rate were enhanced considerably due to the shape and size of the tube, which in this case is a helical microtube. Moreover, the maximum heat transfer performance has been conducted by Al2O3/water Nanofluid with 2% volume concentration and microtube pitch of 18 mm.Â Â Â Â
Measuring the Level of Defect Condition in the Museum Building
Authors: N.F. Zuraidi S. , A. Abdul Rahman M. , A. Akasah Z. 
Published: March 2021

Assessment of buildings is one of the main components that are essential to assess the condition of the building. Without evaluation, it is difficult to determine the current condition of a heritage building, so failure to check can contribute to future assets. The objective of this study is to assess the level of defect condition in a heritage building. This study has selected nine buildings of the museum as a place of study. The location of the museum building is located in three states of Kelantan, Terengganu, and Pahang. All of the museum buildings have been implemented by using Building Defect Assessment (BDA) and used as a survey tool to assess the level of disability at museum building. Defects of each element in the building of the museum have been recorded.Â As a result of the BDA suggests that score full points used to provide the level of evaluating the overall condition of the museum building is good, and the need for action to maintenance requirements such as monitoring, repair, a replacement for preventing defects or serious damage.Â
Low Cost Solar Powered Telecenters for Malaysian Rural Areas: Case Study in Pos Sinderut, Pahang, Malaysia
Authors: D. Ibrahim M. , Zainal S. , K. Othman A. 
Published: March 2021

The main objective of this project is to design and analyze the cost benefits solar PV system for rural telecenter. The project focused on designing the main solar system and solar panel energy performance based on translucency. The task that was carried out in this project was the selection of the suitable system that will suit the operation well while keeping the design cost as low as possible. In this project, the design of the solar panel system was focused on the electric loads and its cost benefit. Homer software was used to evaluate the solar panel system. Meant for ways of communications for indigenous people, the Solar Photovoltaic system is one of the popular solution for off-grid rural community power supply. The optimized combination for a particular rural site can be predicted based on NASAâ€™s data of Solar Global Horizontal Irradiance (GHI). In this project, Pos Sinderut was chosen as the site, and the data load was measured. In our preliminary findings, it was found that the model on site was not suitably designed and maintained. The data parameters that was used for the on-site installed model was also not possible to be calculated when the model was simulated using Homer Software. As a result, we proposed a new model design by optimizing the load of VSAT and charging station based on the amount of solar PV and batteries that was supplied. This paper shows the significance of preliminary designs based on the irradiance and the usage load of the specific site before any installation should be commenced. It also showed how the site should be maintained properly in order to ensure a chosen site is sustainable for the rural community, post-installation.Â Â
Effect of Varying Solvents on Structural Properties of Annealed PVDF-Trfe Thin Films
Authors: N. Arshad A. , N. Sarip M. , N. Sarip M. , Z. Engku Zaharah E. , D. Rozana M. 
Published: March 2021

PVDF-TrFE (70:30 mol%) powders were dissolved individually in three polar solvents of Diethyl Carbonate (DEC), Methyl Ethyl Ketone (MEK) and N-, N-, Dimethylformamide (DMF). The solution was spin coated and formed PVDF-TrFE films of 250 nm thickness; UN DEC, UN MEK and UN DMF films. Â PVDF-TrFE powders were found to readily dissolve in DMF solvent as indicated by Hansen solubility parameters (Î´t). Hansen parameter showed small difference in reading (Î´t = 1.7) forÂ PVDF-TrFE and DMF, and low relative energy difference (RED) value. All films were annealed at 120Â°C (AN DEC, AN MEK, AN DMF). The AN DMF film showed high presence of polar Î²-phase crystals as evident from the ATR-FTIR spectrum. This is given by the significant peaks at 848, 1190, and 1290 cm-1. The trend is consistent with XRD pattern, where relative increment of cps value (53%) at 19.2Â° (2Î¸) is observed. This further supports the high degree of Î²-phase crystals observed in AN DMF film.Â Â
Silver Metallization Characterization and Resistivity Performance Potential toward Chemical Sensor Application
Authors: A. Bakar Amnani , H. Hashim Nor , A.Tajuddin Hairul , Z. Sahdan Mohd , A. Saparudin Faiz 
Published: March 2021

Performance of limiting resistive and capacitive signal delays increases gradually depends on the complexity degree of multilayer metallization. Electrodes sensor for electrical applications requires low surface roughness and low resistivity metal layers. Amongst conductive metal series, silver (Ag) has the lowest resistivity. On the other hand, compared to aluminum and copper, this metal also has higher oxidation resistance. This study aims to characterize Ag thin film on the glass substrate and the resistivity performance by using a physical deposition technique for chemical sensor application. A series of Ag thin film with different thickness were prepared from thermal vacuum evaporator at 3.45 x 10-5 Pa with applied current at 28 Ampere in 21 minutes. Four-point resistivity probing instrument was used for resistivity testing of the thin films with different thickness. The prepared Ag thin film shows a low average roughness at 1.89 nm. A smooth and homogeneous of Ag thin film is an advantage to provide a sensitive surface for element recognition in the development of chemical sensor and an adsorbate can be justified whereas it schematically assembled with the arrangement onto smooth and perfectly flat thin film surface. Ag thin film has shown a crystallite size with respect to 50.84 nm. The low rough surfaces have fewer nucleation sites, therefore fewer grains (crystallites) will appear. The optimum thickness was determined at 107 nm and the resistivity of Ag thin film was an average at 1.988 x10-8 Ohm m.Â Â Â
Sizing a 3 kWp Retrofitted Grid-Connected Photovoltaic System: a Case Study in Tropical Malaysia
Authors: Zainuddin Hedzlin , Liyana Muhammad Khir Farah , Baharudin NA , Rahman ZAbd 
Published: March 2021

The work presents a tropical case study of sizing 3 kWp retrofittedÂ grid-connected photovoltaic system (GCPV) installed in Klang, Malaysia. The sizing was based on customerâ€™s budget requirement of RM 22, 500 and conducted through a designated mathematical approach. The mathematical approach involved technical aspects which aligns the voltage and current specifications of both PV array and inverter. Besides, this approach includes possible severe climatic condition of solar irradiance and ambient temperature variations. By implementing the sizing mathematical approach in this study, the final PV array configuration is 1 x 9 (1 parallel x 9 series). This study was also conducted to compare between the actual and the predicted energy yield to reflect customer satisfaction. Based on the result, the percentage differences are acceptable for February and March 2018. Interestingly, the percentage difference for January 2018 was over-predicted and the abnormality was suggested to be resulted from the inaccuracy of the Peak Sun Hour (PSH) estimation. In conclusion, this study is significant as an overview on the sizing and performance reliability of GCPV system in tropical Malaysia to meet up the customer satisfaction.Â
Oxygen Reduction Reaction of Carbon Nanotubes Supported Polypyrrole Doped Toluene Sulfonic Acid in Alkaline Medium
Authors: Sri Utami Rika , Yin Wong Wai , Herianto Majlan Edy , Shyuan Loh Kee 
Published: March 2021

In this study, polypyrrole/toluene sulfonic acid-based nitrogen doped carbon nanotube (NCNT) is synthesized via chemical oxidative polymerization followed by high-temperature heat treatment under N2 atmosphere. The structure, morphology and composition of the NCNT catalyst are investigated with X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman spectroscopy. Different N species including pyridinic, pyrrolic, graphitic, and oxidized-N are quantitatively determined by X-ray photoelectron spectroscopy (XPS). The electrocatalytic activity of NCNT towards oxygen reduction reaction (ORR) in alkaline condition is evaluated with cyclic voltammetry (CV) and rotating disk electrode (RDE). The globular and tubular structure of NCNT can be clearly seen from SEM images. The typical Raman spectrum for NCNT showed two prominent bands around 1348 cm-1 (D band) and 1568 cm-1 (G band). High-resolution XPS spectrum of N 1s for NCNT showed that graphitic-N has the highest percentage (39.36%), whereas the pyridinic-N (26.54%), pyrrolic-N (18.88%) and oxidized-N (15.22%). The ORR electrocatalytic activity of the NCNT in 0.1 M KOH has the onset potential of -0.154 V vs. Ag/AgCl, the current density 0.455 mA/cm2, and electron transfer number of n â‰ˆ 4.Â Â
Correlation of Pseudoelastic NiTi Egineering and True Stress-Strain Curves on the Effects of Nickel Titanium Composition
Authors: Abd Hamid Nubailah , Adnan Azlan , Hussain Ismail Muhammad , Ibrahim Azmi 
Published: March 2021

This research highlights the novel properties of pseudo-elastic Ni-Ti bar owing to their ability to reverse macroscopicallyÂ inelastic deformation during earthquake known as recentering capability and large elastic strain capacity whichÂ originated from the reversible austenite to martensite phase transformation.Â Hence, this paper presents and evaluatesÂ the cyclicÂ properties of pseudo elastic Niâ€“Ti shape memory alloys to assess their prospective use for seismic applications to be exploited as seismic resistant design and retrofit. In addition,Â the correlation of hysteretic behavior of Ni-Ti alloy in terms of cyclic loading number and history, mechanical properties at ambient temperature, equivalent damping, energy dissipation andÂ recovery stress were evaluated. The NiTi barÂ used is with weight percentage ofÂ Ti-43.98 at. % Ni 56.02 and diameter of 12 mm. The tensile cyclic test obtained demonstrated a rounded loading curve based on a 0.2 % offset. The as received bar exhibited superior pseudo-elastic behaviour and recentering through repeated cycling without significant degradation or permanent deformation but low energy dissipation due to narrow hysteresis while the steel rebar showed vice versa. Experimental results show potential for the use of SMAs in seismic applications and provide areas for continued research. It was concluded that the as-received pseudo elastic Ni-Ti bar is suitable for use in seismic mitigation despite of their ability to undergo cyclical strains at 6 % which is greater than 5 %, with minimal residual strain of 0.15% which is less than 1%.Â Â Â Â
Synthesis and Characterization of a Silver Nanoparticles-Reduced Graphene Oxide Nanohybrid by using â€˜Zingiber Officinaleâ€™ Extract as a Reducing and Stabilizing Agent
Authors: Izrini Ikhsan Nurul , Farahah Jaffar Nur 
Published: March 2021

An eco-friendly solution-based chemical approach has been used to prepare silver nanoparticles-reduced graphene oxide (AgNPs-rGO) nanohybrid using Zingiber officinale extract as a reducing and stabilizing agent. The products form a stable aqueous solution without any surfactant stabilizers and hence makes it possible to produce AgNPs-rGO nanohybrid on a large scale using low-cost solution processing technique. The nanohybrid was monitored at different concentration of GO solution (0.1 mg/ml, 0.5 mg/ml and 1.0 mg/ml) and characterized using UV- visible (UV-Vis) absorption spectrum, transmission electron microscopy (TEM), X-ray diffraction (XRD), and Raman spectroscopy analyses. From the UV-Vis analysis, the formation of silver nanoparticles (AgNPs) was confirmed and showed a surface plasmon resonance (SPR) absorption band at 420 nm for nanohybrids with GO concentration of 0.5 mg/ml. Raman spectra shows an increase in ID/IG ratio for rGO with values of 1.007 corresponding to the concentration of GO (0.5mg/ml) as compared to GO (0.88). Completely spherical Ag nanoparticles (NPs) were found at a nanohybrid with 0.5 mg/ml of GO with an average particle size of 20 nm. The AgNPs-rGO(0.5) nanohybrid exhibit fast electron-transfer kinetics for electrochemical reaction of Fe (CN)63-/4- redox couple, suggesting the potential applications for electrocatalysis and electrochemical sensor.Â Â
Conductivity Performance of Biopolymer Membrane based on Kappa-Carrageenan
Authors: Zakaria Rosnah , Mohd Nor Asiah , Kartini Jaafar Nor , Malik Marwan Ali Ab 
Published: March 2021

Smart energy systems are well-known among researchers who wish to introduce new technology. Biopolymer is an environmentally friendly material. Kappa-Carrageenan is one type of biopolymer with high proton conductivity and durability which has been studied for almost 10 years. The membrane based on kappa-carrageenan was prepared using solution cast technique incoorperated with ammonium thiocyanate (NH4SCN). The solution was poured into glass petri dishes and left to dry at room temperature before further dying in an oven at 60Â°C to obtain thin films. The highest conductivity was obtained for 40 wt. % NH4SCN added kappa-carrageenan. The conductivity dropped when the amount of kappa-carrageenan is equal to the amount of NH4SCN. The maximum conductivity of kappa-carrageenan incorporated with NH4SCN obtained is 1.64E-03 S cm-1. FTIR studies show peak at 1638 cm-1 in pure kappa-carrageenan which slowly disappeared at 60 wt. % kappa-carrageenan. It is however characterized by a peak attributed to NH4SCN at 1600 cm-1 which appeared for 50 wt. % of kappa-carrageenan and below.Â Â
Ion Transport Mechanism in Flexible PMMAIL/LiTf Films
Authors: Akemal Muhd Zailani Nabilah , Abdul Latif Famiza , Malik Marwan Ali Ab , Azri Ab Rani Mohd A , Zu Azhan Yahya Muhd 
Published: March 2021

Acrylates such as poly (methyl methacrylate) (PMMA) has been widely studied as polymer electrolyte film due to its good mechanical stability towards lithium electrode.Â However, commercial PMMAs even at high molecular weight are not able to produce flexible films due to their polar nature that prone to form interchain crosslinking via hydrogen bonding. Therefore, the formation of hydrogen bonding was hindered by incarcerating ionic liquid (IL) of 1-methyl-3-pentamethyldisiloxymethylimidazolium bis(trifluoromethylsulfonyl)imide, [(SiOSi)C1C1im] [NTf2] during free radical polymerization of MMA. Interestingly, the synthesized PMMA containing IL (PMMAIL) produced flexible and free standing films with ionic conductivity of ~10-7 S cm-1. Though the ionic conductivity obtained is comparable with other doped PMMA film electrolytes that had been studied, it is still considered as low for application in energy storage devices. As an alternative, in this study, lithium triflate (LiTf) salt was added into the PMMAIL system and the highest ionic conductivity obtained was 2.65 Ã—10-4 S cm-1 with addition of 30 wt.% LiTf at ambient temperature. The temperature dependence conductivity and AC conductivity behaviour of PMMAIL/LiTf were further investigated in order to fully understand the ion transport mechanism that occurred in the system. It was found that the PMMAIL/LiTf system fits the Arrhenius behaviour and Correlated Barrier Hopping (CBH) model.Â Â
Electrically Conductive Polyester Fabrics Embedded Polyaniline
Authors: Nurzatul Ikma Omar Siti , Zainal Ariffin Zaidah , Mad Akhir Rabiatuladawiyah , Izzharif Abd Halim Mohamed , Ramli Rosmamuhamadani , Muzamir Mahat Mohd 
Published: March 2021

Recently, conductive fabric has attracted massive attention among researchers due to their unique conductive properties with a wide range of possible applications. This study explores the fabrication of poly aniline (PANI) conductive fabric through an immersion technique of polyester fabric in PANI solution. Two types of acids (sulphuric acid (H2SO4) and p-toulene sulfonic acid (pTSA) have been employed as the doping agent to induce the conductivity in various weight percentages (0.3, 0.6 and 0.9 wt%) with immersion time of 5, 10 and 15 minutes. The fabricated conducting fabrics were then characterized by Fourier Transform Infrared Spectroscopy with attenuated total reflection (FTIR-ATR) and X-ray Diffraction (XRD) for analyses of chemical structure and phase identification respectively. Their morphologies were observed by Scanning Electron Microscope (SEM) which revealed the various fibrous structure. The finding is in line with the electrical conductivity properties of the fabrics observed using Four-point probe technique. Optimum conductivity of the conductive fabrics were found to be at 0.6 wt. % for both types of acid which are 1.30 x 10-2 S/cm (H2SO4) and 1.39 x10-3 S/cm (pTSA). Meanwhile, the varied immersion time showed no significant changes on this property, due to the short time laps. For FTIR results, the peaks confirmed the presence of PANI-EB together with the introduced acid within the PANI backbone. Collectively, H2SO4 is found to be a good candidate as doping agent, deduced from obtained conductivity values and structural properties.Â Â
Understanding Technology Literacy: The Characteristics of ICT Literacy Vocational Teachers
Authors: S Saripudin , Sumarto S , A Juanda E , Ghafar Abdullah Ade , A Ana 
Published: March 2021

Information and Communication Technology (ICT) Literacy is the ability to use digital technology, communication tools and/or networks to define, access, manage, integrate, evaluate, create and communicate information well and legally toward a knowledgeable society. This literature study looks at the level of ICT literacy of vocational high school (SMK) teachers. The purpose is to determine the ICT literacy skills of vocational teachers in integrating and assessing ICT learning. The method used is literature review by searching and selecting articles / journals with suitable topics which then are proceed to analysis. The results of this literature study are to look the ICT literacy of vocational school teachers in using technology to conduct learning in the classroom.Â Â
Pipe Stress and Turbine Nozzle Load Analysis for HP Steam Inlet and MP Steam Extraction on Turbine Generator 51G201T Capacity 10MW
Authors: Komarudin Udin , Philo, Nia Nuraeni Iftika , Syifa Puspani Nissa 
Published: March 2021

Thermal pipe expansion on the turbine greatly affects the performance of the turbine, mainly produces misalignment in turbines. The stress analysis on the pipe and the load on the nozzle is very important to ensure that the stress that occurs is still safe and the load that occurs on the nozzle is still below the allowable load. Field information is known, Steam type of 51-G-201-T, capacity 10 MW, total weighs 58 tons, weight casing 37 tons, which has been operating since July 1989, has been occur misalignment on turbines. Stress pipe and load analysis of turbine nozzles on the turbine using software (Autopipe V8i Select Series 3 Edition by Bentley). In this perspective, calculation methodologies were developed in order to do quick analysis of the most common configurations, according to the codes ASME B31.1 (Piping Power). The results of the pipe stress analysis showed that the maximum sustained stress ratio occurred at point A39 (0.32), maximum displacement stress ratio at point A39 (0.97) and maximum hoop stress ratio at point A09 (0.44), all values below 1. This shows that the stress is still safe. The result of load analysis on the turbine casing is the direction x = -880 kg, y = 6246.4kg, z = -3697.7kg, smaller than the weight of the 37 tones turbine casing, so misalignment is not caused by shifting the turbine casing.Â Â
Design Model of Digital Dashboard Human Resources Information System based on Competence (Case Study at PT. Daya Adicipta Mustika)
Authors: Hamdani Dani , Purno Wahyu Arry , Sanihardjo Rosalin 
Published: March 2021

CBHRM is one of the patterns of human resource management is being grown in Indonesia. In this approach, the vocabulary of competence to be a key element. Each employee will be assessed on its competence. In order results can be more optimally achieved, it would require a model of presentation of the good report/well output. One of the solutions the authors propose is to use a digital model of the dashboard. The model was built using the dashboard frame of mind which has been adapted to the life cycle model. Case studies conducted at PT. Daya Adicipta Mustika, and digital dashboards built CBHRM consist of Talent Dashboard, Dashboard Gap Competencies, and Comparison Dashboard interrelated with each other.Â Â
Implementation of Learning Effect Scheduling on SMEâ€™s Injection Moulding Machine
Authors: Damur Rochman Didit , Anwar Asep , Nugraha Ucu , Putri Usi 
Published: March 2021

This study conducted on SME company in Bandung which have problem on machine scheduling. Current method that company use to schedule job and machine using simple FCFS method which resulting increase inventory and tardiness cost. We proposed machine scheduling with learning effect that developed in the previous research. Using repeat order data, we obtain 20 job that company regularly produce, we calculate scheduling with proposed method and result are 1.71% and 1.81% improvement that FCFS method that company use. Implementation step we proposed to company owner and future work to include quality and time deterioration.Â Â
Semiotics at Discursive Texts and Images in Online News
Authors: Heryono Heri , Faisal Helmy , . . 
Published: March 2021

The paper established an inappropriate relationship of text and image that should interact in one whole package of online news. It applied Semiotics analysis to go under the problems occurred. The analysis was developed to respond the question: why should be the text and image in online news associated? Do they match? Developed in three levels of analysis processes-analysis of relevant engagement in text and image; extended analysis of discursive relationship involved in news that turned to hoax; the intention of attaching the misplaced image to the text. This paper used qualitative Semiotics analysis to illustrate malfunction of text and image in online news. It is wished to be able to enhance the accuracy of a news.Â Â