Universiti Putra Malaysia
Download Latest Complete Journal - JST Vol. 25 (S) Nov. 2017
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(Downloads: 177)
Abstract (Viewed: 15)The development of Ultra-wideband (UWB) directional microstrip antenna is to offer solutions for problems related to bandwidth, cost, power consumption, and size generation electronic communication equipment. The UWB allows for high-speed wireless connection through a variety of electronic devices and computer within a certain area. It can be used for Internet access and multimedia services with data up to 1 Gbps as well as for radar applications, tracking, determining an object's position. With the development of UWB, the accuracy of the position of an object can be increased either indoors or outdoors. The antenna has an important role in UWB, such as integrated circuit, getting transient characteristics (short impulse response) and the UWB antenna microstrip is design with monopole or dipole antenna. The decline in antenna performance can be prevented using UWB directional microstrip antenna. This research was based on experimental method using a Vivaldi microstrip antenna. It used software 3D electromagnetic simulator. The development of UWB directional Microstrip antenna radiation characteristics of designs that meet the specifications which have VSWR < 2 for the frequency range of 3.1 to 10.6 GHz. 3D electromagnetic simulator, directional, microstrip antenna, ultra-wideband
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(Downloads: 76)
Abstract (Viewed: 4)Ciplukan (Physalis angulata) is a medicinal plant in Indonesia, belonging to the family of Solanaceae. Based on molecular phylogenetic analysis, this plant is relative to Ashwaganda (Withania somnifera), the famed South Asia medicinal plant touted to kill cancer cells. A study was conducted on genetic variation of Ciplukan using Random Amplified Polymorphic DNA (RAPD) marker. A total of 23 plants from Northern, Southern, Central, Eastern, and Western part of Bandung were examined The RAPD analyses were performed using three selected random primers (OPA1, OPB17, and OPB10). Clustering analysis was conducted based on Unweighted Pair-Group Method with Arithmetic Average (UPGMA) using MEGA 4. Dendrogram showed that the sample plants were not grouped by their geographic localities, suggesting that a genetic interaction occurs among plants from five different locations. This result was also supported by the high level of estimated gene flow (Nm= 1.0919). It is likely due to the nature of self-incompatibility in Ciplukan which requires cross-pollination, creating a higher exchange of genes and leads to homogenization of genetic composition. Overall, these results indicated no genetic differentiation, meaning that all individuals remain taxonomically under the same species. Ashwaganda, Ciplukan, Polymorphism, RAPD fingerprinting
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(Downloads: 56)
Abstract (Viewed: 6)This study analysed physical properties of landslides at Cililin using a Lumped Mass Model. It used analytical and numerical methods. The results show that landslide happens at a slope of about 32.74° angle. It usually occurs at the base of the slope, around 700 m in the horizontal direction relative to the initial position and the predicted landslides after landslides for 26 seconds. About 26 seconds after the landslide, the run-out is 800 m with a total travel time of about 33 second. The length of the initial landslides is 200 m experienced as fragmentation effect until the base of the incline before it shrinks after passing basic tilt and stops at the end of 500 m length. The areas affected by the landslide are determined by analysing the centre of mass velocity and the front of the landslides. Prediction run-out for the three locations around the location of landslides Cililin, showed that the magnitude of the tangent slope angle is smaller than the value of the coefficient of friction, and hence it is not prone to landslides. Landslides, Landslide parameters, Lumped Mass Model
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(Downloads: 63)
Abstract (Viewed: 12)The aim of this study is to improve the mastery of the concept of students' logical thinking, especially in learning algorithm, applied to a new learning model. It is named the "cyberblog" model, which is a web-based learning model that combines web and blog functions in one weblog concept in the form of text, audio, and video developed with sources from the internet and researchers themselves. Therefore, this research proposes the Cyberblog model and describes its implementation. Some experiments on the concept of logical thinking are conducted. The sample of this study is students of the Department of Computer Science in Bandung city. Data were collected by using a test mastery of the concept of logical thinking and field notes and will grow to a computer network-based media (internet) specialized in the learning algorithm that is considered difficult. The results showed a medium of learning that can improve students' logical thinking skills. Cyberblog, Logical thinking, Model, Research and development, Web based learning, Weblog
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(Downloads: 46)
Abstract (Viewed: 4)Rockfall is a type of landslide that involves a single rock movement. The impact of rockfall hazard can be reduced by predicting rockfall's motion and mitigate any negative outcome based on the predicted results. Gunung Batu Lembang is a rockfall prone area due to its steep contours compounded by weathering of andesite rocks. Gunung Batu is located in the active fault Lembang. Rockfall runout can be predicted using Colorado Rockfall Simulation Program 3 Dimension (CRSP - 3D) software. Results of modelling and simulation using the CRSP - 3D show that potential rockfall at between 73,124 meters and 86,565 metre, and all the rockfall at the toe of slope can be potentially hazardous. Based on predicted result, the first rockfall prone area is along the road and which necessitates the building of protective levee along the road. CRSP-3D, Rockfall, Run-out
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(Downloads: 39)
Abstract (Viewed: 1)The magnetic properties of Co: TiO2 thin film with low cobalt concentration was investigated. The Co: TiO2 thin films were grown on n-type Si (100) substrate using metal organic chemical vapour deposition technique. The cobalt concentration in the Co: TiO2 thin film was determined using energy dispersive X-ray spectrometer and the magnetic properties of the film was determined using a vibrating sample magnetometer. The energy dispersive X-ray spectrometer results show that the cobalt concentration in Co: TiO2 thin films (denoted by x) are x = 0, x = 0.2%, x = 0.3%, x = 0.7%, and x = 1.1%. The vibrating sample magnetometer results indicate that each (exclude x = 0) after film exhibits ferromagnetic properties at room temperature. Saturation magnetisation of Co: TiO2 thin film varies from 1,0 emu/cm³ to 4,4 emu/cm³ and increases as the cobalt concentration in Co: TiO2 thin film increases. On the other hand, magnetic coercivity of Co: TiO2 thin films varies from 4 mT to 12 mT and decreases as the concentration of cobalt in Co: TiO2 thin film increases. Co: TiO2, magnetic properties, metal organic chemical vapour deposition, thin film
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(Downloads: 40)
Abstract (Viewed: 6)Many studies have reported on the antitumor, antioxidant, antiarthritic and anti-inflammatory properties of curcumin. The present examined effects of curcumin together with exercise to increase VO2max, and lactate threshold in human. In a study on animals, 10 -week-old male Wistar rats were divided into non-eTR and eTR groups. We used low (50 mg/kg-BW/day) and high doses (100 mg/kg-BW/day) of curcumin dissolved in dimethyl sulfoxide (DMSO). These doses were injected intraperitoneally into all animals for two hours before swimming exercise using Western blot (WB) analysis. In the study on humans, the sample was divided into two groups and the duration who were asked to consume two capsules (@ 550 mg) per day for 6 weeks. Aerobic exercise (jogging) was scheduled 4 times a week during the period, at vigorous intensity (60-90% maximum heart rate). The level of VO2max, and lactate threshold was examined pretest and posttest. Results showed that low doses and high doses curcumin treatment significantly increased COX-IV protein expression. Furthermore, 1.1-gram curcumin/day for 6 weeks significantly increased VO2max, and lactate threshold on human. The results showed that curcumin treatment can optimise human performance through its ability to increase VO2max, and lactate threshold. Aerobic exercise, curcumin, lactate threshold, VO2max,
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(Downloads: 49)
Abstract (Viewed: 7)Smart home is a system that controls electrical equipment remotely via WLAN and Internet. The Smart Home system was created using Raspberry Pi as a data processor, Android Smartphone as a user interface, the relay module as electronic appliance controller, Wi-Fi dongle as a communication medium and a router for port forwarding. In addition, the system is equipped with a security system that can be used to monitor the situation around the home via a webcam as IP Camera, PIR sensor for motion detection and GSM modem for sending SMS and telephone. The test results showed that the Smart Home system can work properly to control four loads at once via the internet or through the media WLAN. The features of the security system works well to monitor the situation through the application interface based on Android and warnings in the form of SMS and telephone numbers sent to the user when the PIR sensor detects movement. Therefore, the smart home system is stable, safe, reliable, easy to use, thus, contributing to efficient energy usage in order to conserve precious natural resources by reducing electrical energy consumption. Energy Saving, Raspberry Pi, Smart Home
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(Downloads: 39)
Abstract (Viewed: 2)Auto technology is a new breakthrough in developing devices related to sports enhancement. Therefore, the purpose of this study was to develop a device based on ultrasonic sensor using a liquid crystal display to maximise leg power. The components of the new device are a microcontroller ATMEGA-328, liquid crystal display and HC-SR04 ultrasonic sensor. The study was conducted in the laboratory of sport science, faculty of sport and health education, Indonesia University of Education. Ten students from Sport Science study program were recruited as samples. A prototype of maximal leg power measurement device was invented and results showed that there were no significant differences between auto and manual testing. However, the device can be used to determine maximal leg power more accurately, easily and effectively. Leg power, liquid crystal display, Microcontroller, Ultrasonic sensor, Vertical jump
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(Downloads: 31)
Abstract (Viewed: 1)This study examines Latent Semantic indexing (LSI) using Singular Value Decomposition (SVD) in the knowledge retrieval process, namely indexing Indonesian text. There are three stages in this process: (1) text processing, which consists of tokenisation, filtering, and stemming process, (2) developing LSI using SVD and (3) evaluating and measuring performance. The result showed Mean Average Precision around 77.90% on scenario matrix dimension 120 and average precision for first retrieval around 83.33% on scenario matrix dimension 90. Knowledge Retrieval, LSI, SVD
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(Downloads: 35)
Abstract (Viewed: 5)This paper discusses the application of software design to display graph plots of Digital Signal Processing (DSP) results. This design uses MATLAB programming language by utilising the MATLAB GUI. This application was built using MATLAB R2012a for the 32-bit version and MATLAB R2014a for the 64-bit version. The application can plot graphs of digital signal processing results such as sampling, convolution, deconvolution, Discrete Time Fourier Transform, Z Transform, FIR Digital Filters, IIR Digital Filters and many others. The software can be installed on all windows operating system and function as a stand-alone program with all supporting files integrated in one package installer and therefore, easily distributed. By using this application, we can resolve many cases on DSP simply and interactively. Application software, Digital Signal Processing, Graph Plot, MATLAB, Stand-alone
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(Downloads: 27)
Abstract (Viewed: 2)This paper discusses the design and realisation of an 8-slotted waveguide antenna with a cross slot design for Long Term Evolution (LTE) applications. The method used in this paper is simulation, fabrication, and measurement. The simulation was carried out using 3D Electromagnetic Simulator. The designed antenna was made of brass plate with thickness of 0.8 mm. The overall dimension of this antenna is 113 mm x 59 mm x 813 mm with the slot dimension of 57.22 mm x 7.85 mm. The result of simulation confirmed that the antenna has the bandwidth of 133.9 MHz at the frequency of 2.28 to 2.41 GHz with -10dB return loss. The result confirmed that the antenna has 164.3 MHz bandwidth from 2.28 to 2.44 GHz with a similar return loss. Antenna, cross slot, LTE, waveguide
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(Downloads: 20)
Abstract (Viewed: 2)Aircraft noise and fog still become the problem at many airports affecting the comfort of passengers and those living at its vicinity. Further, it causes many accidents or crashes due to decreased of the visibility. The purpose of this research is to analyse how noise and smog can be managed for the safety and comfort of passengers and residents living near the airports. The case study is International Airport Sultan Mahmud Badaruddin II Palembang and 90 passengers were interviewed through a questionnaire in order to understand how the airport manages smog and noise pollution. Airport Noise, Airport Service Quality, Smog, Sound Pollution
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(Downloads: 32)
Abstract (Viewed: 3)This study aims to determine the rate of corrosion of a condensing unit. Condensing unit is the main component of a split air conditioner which is installed outside a building (outdoor) and is always exposed to the elements as well humidity. Such conditions make the condensing unit vulnerable to corrosion. Further, the corrosion affects the performance of the air conditioner. Temperature and humidity (air velocity, hot and cold temperature) greatly affect the corrosion rate. This is an experimental study and data was based on observation and analysed using the formula corrosion rate. The results indicate that FeFe2O4 and FeO compounds affect corrosion rate. Specifically, the rate of corrosion on the metal plate of condensing units is 0.054 millimetres per year (mpy) at an ambient temperature of 30°C and 85% humidity. Atmospheric, condensing, corrosion, humidity, metal
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(Downloads: 36)
Abstract (Viewed: 3)Consumer demand for composite flour-based biscuit has increased. 'Healthy biscuits' containing fibre as functional food has become a trend. This study examined the properties of biscuits made from modified potato flour. Resistant starch in modified potato flour may serve as dietary fibre and hence, the purpose of this study was to determine the chemical characteristics and sensory properties of these biscuits. Therefore, the modified potato flour was subjected to two different treatments in order to examine its properties: a) three heat treatment: boiling, steaming, and baking, b) substituting it at10, 20, 30, and 40% levels respectively. Results showed that biscuit substituted with modified potato flour was acceptable to consumers based on sensory assessment. Different heat treatment did not have an effect on biscuit taste. Biscuits made from 40% modified potato flour contains a good source of 6.49% dietary fibre, and fat, protein, ash and moisture contents of 28.5%, 9.90%, 0.02%, and 4.04% respectively. Biscuit, chemical characteristics, modified potato flour, sensory properties
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(Downloads: 69)
Abstract (Viewed: 7)This study is aimed at developing a suitable media for improving learning of Japanese kanji using an android application. The authors also examined the effectiveness of current application to learning basic Japanese. Utilising Information and Communication Technology (ICT) is not common. The media proposed in this study is also suitable for students who are learning independently. Further, this media is based on spacing effect theory, which has a huge impact in helping and improving long-term memory. Since the media uses an Android application, there is no age, grade, and level constraints. Further, the student is able to use the application wherever they are and whenever they have the time to learn. The media is also attractive, easy-to-use, and helps students to easily memorise Kanji. Android software, Kanji, Japanese character, media

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