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Linear Low-Density Polyethylene (LLDPE) is a form of blended Low-Density Polyethylene (LDPE) with numerous short side chains. LLDPE has gradually gained popularity in recent decades, and its demand has increased, especially in the packaging and construction industries due to its lower manufacturing cost. This fabrication process of geotube containers using this material is investigated. This paper reports the comparison result of sealing performance between stitching and heat-sealing method for the fabrication process of geotube containers. Two types of LLDPE bags with different fabrication methods (stitching and heat-sealing) were prepared for the test. Once the bag was filled with water, it was left in an open space. The weight of the bag was measured for 60 days at different intervals (days and weeks). Results show that there was a decrease in LLDPE bag using stitching method from 1.4 kg to 1.32 kg for 3 days whereas the LLDPE bag using heat-sealing method did not show any weight changes and remained 1.42 kg for 60 days the data were taken. From the observation, it can be concluded that the fabrication process of using the heat-sealing method will not degrade the weight of the bag and has high potential to be applied in the fabrication process of geotube using the LLDPE material. [ABSTRACT FROM AUTHOR]

Lubrication is one of the crucial elements affecting the engine performance of motor vehicles. It carries numerous functions, such as lowering friction, heat disposal, critical areas sealing, and other essential functions. Lubricant with thermophysical properties is reported to present better performance than conventional lubricant and is mostly used to produce superior lubricant performance. Nanolubricant represents the addition of nanomaterial into the lubricant to enhance its lubrication or thermophysical features. The nanoparticle suspension shows the agglomeration tendency induced by high surface activities. Accordingly, we used Oleic Acid to disperse the nanoparticle, forming a more stable suspension. The nanolubricant was synthesized using SAE 5W-30 lubricant, added with 0.5% of Al2O3, TiO2, and hybrid Al2O3/TiO2 nanoparticle, along with 10% of Oleic Acid. The research procedure was begun with the characterization of Al2O3 and TiO2 using SEM-EDX, XRD, and FTIR. The nanolubricant synthesis was carried out through four hours stirring process at 1000 rpm speed. Further, the thermophysical feature analysis covering the density, dynamic viscosity, and thermal conductivity was completed to identify the effects of nanoparticle addition on SAE 5W-30 lubricant. Meanwhile, the analysis of nanolubricant effects on the Honda Beat motorcycle performance covering the torque and power was completed using a dynamometer test. The results of data analysis showed an increasing nanolubricant's thermophysical properties to 751.7 kg/m3, at 0.06863 Pa.s density and 0.145 W/m.Ka dynamic viscosity in the thermal conductivity value. Meanwhile, the motor vehicle performance test showed an increasing torque of 8.24 N.m and 11.05 HP power. The nanolubricant added with TiO2/Al2O3, and oleic acid surfactant was observed to generate the highest performance of the motorcycle. [ABSTRACT FROM AUTHOR]

The efficiency and effectiveness of motor vehicle engine performance in the automotive industry is strongly influenced by the condition of the lubricating oil used. Nanotechnology applied in lubrication has become a topic of research in the field of metal machining and manufacturing. Nanolubricant is useful for increasing the efficiency of lubrication because it has a rolling effect so that it can reduce friction that occurs. This research used SAE 5W-30 lubricant and added 0.5% Al2O3 and TiO2 nanomaterials. The initial step is to test the material characterization using SEM-EDX, XRD, and FTIR. Calculations and testing of thermophysical properties (density, viscosity, and thermal conductivity) were carried out to determine the effect of adding nanomaterials to the thermophysical properties of nanolubricant. Motorcycle performance testing uses a dyno test to determine the effect of nanolubricant on engine torque and power. The results of this study showed an increase in the thermophysical properties of the hybrid nanolubricant at a density of up to 806 kg/m3, an increase in the viscosity value of 0.06816 Pa.s, and a decrease in the thermal conductivity up to 0.101 W/m.K. The addition of nanoparticles to the hybrid nanolubricant also provides an increase in torque of 8.24 Nm and an increase in power up to 11Hp. [ABSTRACT FROM AUTHOR]

An Ultra-wideband (UWB) rectangular corrugated edges antipodal Vivaldi antenna (RCE-AVA) designed for through wall imaging applications is demonstrated. In this study, two distinct designs for antipodal Vivaldi antennas are reported: a conventional AVA and a rectangular corrugated edges AVA. In this study, a parametric-based analysis of both antennas is presented. At first, a conventional AVA with an elliptical shaped antenna is designed using FR4 substrate. Additionally, the antenna is modified with Rogers-5880 material by implementing same size rectangular corrugations on the edges of the antenna. Furthermore, the modified antenna provides stable gain and high directivity throughout the UWB band. The proposed antenna worked in the frequency rangefrom 3.1 GHz to 10.6 GHz with improved radiation properties. A maximum gain of around 11.8 dB is achieved with a return loss value of less than -10. Computer Simulation Technology (CST) simulation software was used to verify the design, parametric evaluation, and optimization of RCE-AVA. [ABSTRACT FROM AUTHOR]

Buildings in Malaysia consume 14.3% of total energy and 53% of electrical energy. One of the major contributors to overall building energy consumption is the air conditioning mechanical and ventilation system (ACMV). Therefore, optimizing the building's energy efficiency for the ACMV system is essential to improving the environment and reduce energy consumption, especially for the office building. As beginning, the usage of a cost-effective energy monitoring and control system has become important for tracking and tracing energy flows, especially for ACMV system. This system is essential parts in order to optimize energy usage for this study, a 27-years-old office building in Terengganu has been installed with this system. Methods: The system consists of Web-Based Supervisory Control and Data Acquisition (SCADA) system, Mobile IoT Applications, local monitoring device that are connected to electricity power meter and controller, which capable of regulating room temperature as well as controlling operation of the ACMV system. The Main Switch Control Panel (MSCP) is equipped with a Remote Terminal Unit (RTU) responsible for causing the automatic operation of the Water-Cooled Packaged Units (WCPUs). The RTU receives commands from and send the information to the SCADA Server through LAN network. Result: The development of an Internet of Things (IoT)-enabled device that uses the Modbus remote control unit (RTU) protocol to interface with multi-digital energy meters. The monitored data include the energy consumption, room temperature and other related data such as average current, total power and average voltage. Besides, the system allows to be controlled include daily operating hours including start and stop timing of the WCPUs and compressors can be set in advance. The IoT application can be accessed either through web browser or by installing a dedicated android apps, developed specifically for this system. Conclusion: The prototype was successfully installed in 27-year-old office building at Terengganu. With the development of this system, it is provided useful information such as energy consumption, hourly running, and other related data. This data is important for building energy management and the ability to detect mechanical or electrical breakdowns early. [ABSTRACT FROM AUTHOR]

This paper presents a bibliometric analysis on house price determination based on articles in Scopus database. The objective of this paper is to analyse scientific research on house price by using bibliometric approach. This paper analysed 408 articles from Scopus database. VOSviewer software was used for data visualization, while Microsoft Excel was used for data analysis. This paper presents year of publications, most active journals, keywords analysis and most influential country. The analysis reveals that the highest number of reported publications is in 2008 and most articles were published in Journal of Urban Economics. Of the 612 keywords, 25 were brought into visualization and United States is the most influential countries. [ABSTRACT FROM AUTHOR]

Thermoforming process has now become the most suitable and conventional method for manufacturing 3D circuits with complex geometries. The mold of commercially available automobile lighting LED is developed using CNC machine. The stretchable circuit is printed on a thermoplastic substrate through screen printing technique before undergoing thermoforming process. The factors that affect a thermoformed product are the stretch level and thickness reductions of the substrate. This paper aims to study the effect of the variation in dimensions of the thermoformed product without the printed stretchable circuit on the substrate. Finite element methods (FEM) analysis is also carried out in order to visualize the behavior of the substrate in terms of area stretch ratios (ASR) and thickness reductions of different wall surfaces after deformation according to the geometry of the mold. The ASR and thickness values obtained by experiment and simulation are compared. As a result, the simulated values are bit higher than the experimental ones but they are acceptable, therefore, the behavior of thermoforming product like large stretch areas and less thickness, can be determined prior to the actual thermoforming process of the product with printed stretchable circuit. [ABSTRACT FROM AUTHOR]

Since the Covid19 epidemic in early 2020, online learning has become the practice for students of all ages in schools, whether in kindergarten, primary, secondary, or even higher education. The transition from classroom activities to digital learning such as quizzes, debates, brainstorming and more tools, have open many opportunities for researchers to analyze, design or develop the application. This research is to regard the gamification in learning which was used by researcher since 2010 in the classroom activities. A literature review was done on the gamification in a learning process before and after the epidemic and how it gives impact on student's affective elements in learning. Besides the literature review, we conducted a preliminary inquiry after students have had experienced the gamification in their learning before the epidemic. We conducted two forms of methods: a focus group conducted prior to the pandemic and an internet survey conducted after the outbreak. Aside from the investigation, we were able to determine students' motivation in online classes by pulling real data from their class access time in the morning class via Blackboard Learn online platform. Aligning traditional teaching and activities in the classroom requires work and ingenuity in terms of how to design it on an online platform while maintaining the same level of participation. We are currently transformed our usual classroom activity such as SUDOKU quiz game into a mobile educational game prototype. Due to the short duration of our project grant, the game prototype will be developed using prototype method. Some planned gaming aspects are suggested in the game, which will be discussed later. [ABSTRACT FROM AUTHOR]

The evaluation of the mechanical properties of micro electronic and mechanical systems (MEMS) of micropillar resonators with part of highly sensitive emerging powerful sensors and small compact size is indispensable for designing MEMS devices. Micropillar resonators are applied with elastic metamaterials act as components, digital controllers and analog electronic circuits that are capable of active multi-resonant. Micro mechanical resonator shows dynamics in their elastic behaviour depending on size and accuracy of material properties to obtain optimum performances sensing. In this paper we investigate properties of micropillar resonator based on high aspect ratio (HAR) for three different kind of material, Aurum, Aluminum and Nickel. The simulation analysis of surface displacement and resonant frequency were carried out using COMSOL Multiphysics through eigenfrequency evaluation system of the supporting continuum with the range within sweep parameter. All of these three materials were sets to obtain mechanically covered micropillar with height scale range between 1-10µm and radius scale range between 2-4µm, Aluminum metal with geometry of 4µm radius and 10µm height can be identify as the highest resonance frequency value with 744.72MHz. [ABSTRACT FROM AUTHOR]

The existence of Batik in Indonesia was related to the development of kingdoms in the archipelago to the spread of Islamic teachings in Java. Batik in the Mataram kingdom, the Kasunanan period, and the Islamic sultanate period had distinctive patterns and colors. After the end of the 18th and 19th centuries, the development of Batik in Java was rapid with the existence of cotton production. In the 20th century, the development of the Batik industry increased with the presence of home Batik production. The purpose of this paper was to reveal the spatial potential of the house for home industry activities carried out by coastal women in community empowerment in Mojo Village, Pemalang. The method of community empowerment initiated by the Department of Marine Affairs and Fisheries of Central Java Province, the formation of two coastal women's groups, comparative studies for two Batik groups in Gemawang, Bawen, Semarang district, and historical studies of Batik activities in Java in the past. From these activities and studies of old literature on Batik activities, the researchers found that the process of Batik activities in the yard of the house had the opportunity to be developed as a home industry activity. [ABSTRACT FROM AUTHOR]

This research investigates the factors that influence high numbers of road fatalities and accidents among motorcycle riders. This study proposes a conceptual framework that illustrates how high-risk road users, such as motorcycle riders, can prevent road accidents by fostering high-impact preventive countermeasures for sustainable traffic safety. Several critical variables on road user behavior related to road accident involvement are presented in a conceptual framework. The proposed conceptual framework suggested that behavioral factors such as anger, attitude, and sensation seeking affect the motorcycle riders' involvement in a road accident. Additionally, mindfulness plays an important mediating role between behavioral factors and road accident involvement. The proposed framework considers a comprehensive set of reviews rarely discussed in the existing literature. Partial least squares structural equation modeling (PLS-SEM) was proposed to evaluate the proposition of the latent variables and their influence on road accident involvement. The proposed path model indicated that mindfulness has a strategic role in reducing road accident involvement, having an indirect effect through riding anger, attitude and sensation seeking. The study could benefit transportation authorities and agencies in Malaysia to execute high-impact countermeasures to reduce road accident involvement among motorcyclists in Malaysia. [ABSTRACT FROM AUTHOR]

The manufacturing business activities, operations and decisions are highly influenced by the current trend on green technology practices, which emerged from the sustainability concept. In the interest of enhancing sustainability development, the need to adopt green technology practices (GTP) is crucial for firms to considered. Prominent scholars in the sustainability studies had found a positive relationship between sustainability practices and firm performance. The aims of this paper is to analyse GTP's effects toward firm performance and the mediation effects of GTP through green technology drivers. Data were collected from 280 Malaysian manufacturing firms to empirically examine the relationships that existed among green technology drivers, GTP and firm performance. Utilizing the SEM-AMOS procedures, the study revealed that two green technology drivers (resource availability and market dynamics) have positive effect on GTP and it fully mediated the link between GTP and performance. Thus, the empirical results confirmed the effects of green technology drivers and GTP in enhancing firm performance. Hence, this research urged that firms should strengthen the practices related to green initiatives internally rather than focusing on external environment to improve firm performance. Furthermore, firms should clearly define the types of GTP that fit to their long term strategic goal with concurrent enhancement to the firm's green sustainable competitive advantage. [ABSTRACT FROM AUTHOR]