Upaya Meningkatkan Hasil Belajar Sains dengan Metode Diskusi pada Siswa Kelas V SD Negeri 011 Bukit Kapur

This research was motivated by the low result of learning science class V students of SDNegeri 011 Bukit Kapur. This study aims to improve learning outcomes science class Vstudents of SD Negeri 011 Bukit Kapur by using the method of discussion. Subjects in thisstudy were students of class V SD Negeri 011 Bukit Kapur, totaling 35 students. This researchis a class act, carried out by two cycles. Parameter research is student learning outcomesconsisting of absorption, mastery learning, student learning activities and teaching activitiesof teachers. The results showed that in the first cycle the average value of daily tests is69.71% (Enough) and the second cycle of the average value of daily tests was 78% (Good).Mastery learning increased in the first cycle was 82.86% and the second cycle is 94.28%.Activities of students in the learning process increased from 73.98% (Enough) in the firstcycle to 73.09% (Enough) in the second cycle. Activities teachers in the learning process is92.5% (Very Good) in the first cycle and 96% (Very Good) in the second cycle. From theseresults it can be concluded that the discussion method can improve learning outcomes scienceclass V students of SD Negeri 011 Bukit Kapur

3D Visualization of CPU Components : A Desktop VR Application

There has been a steady increase in the potential for virtual reality techniques such as Dekstop VR and three dimensional (3D) visualization for many education applications. With the development of computer-aided design systems, it has become possible to supplement or replace physical models with digital models. Currently, it is difficult to provide hands-on practical that are important for many of the technical-based subjects. The objective of this project is to introduce the concept of Desktop VR and to investigate the potential of using AutoCAD2000, 3DStudio MAX R3 and Cortona 3D Studio Max in three dimensional visualisation effects. This project will develop a Desktop VR application. A three dimensional modeling of Central Processing Unit (CPU) components is developed as a mean to educate people on CPU components. The methodology used in developing the three dimensional visualization model is System Development Life Cycle (SDLC). From this project, it is found that the three dimensional visualization of CPU can stimulate a person’s curiosity. The features of the software(s) that are being used in this project are identified. The three dimensional visualization which been. modeled and drawn will allow students to understand the technical method of CPU assembly. It is hoped form this project, VR technology can be associated with education field in future

Motives and barriers to physical activity participation among women civil servant of the supporting group in Putrajaya / Roayaah Zambri

Physical activity has been proven to have a significant impact on individuals’ physical, psychological, physiological and social life. Despite all of these advantages, physical activity remains to be narrowed and dropped out from time to time. This scenario has been mostly occurred among women who are found to lead sedentary lifestyles compared to men. The necessity .to identify their motives and barriers to participating in physical activity is crucial since little is known about physical activity pattern particularly into demographic profiles, motives, barriers and physical activity levels among women civil servant in Malaysia. Hence, this study was conducted to examine the differences and the relationships on motives, as well as barriers to physical activity participation across physical activity levels. A total of 447 women civil servant completed a set of questionnaire on physical activity levels, motives and barriers to physical activity participation. The results found that 68% (N=143) of the women civil servants were classified into pre-contemplation, contemplation, and preparation stages which indicate they were not being physically active enough. Fitness and health, and appearance motives were found to be the most important motives, while personal well-being and cultures and religiosity were became the most barriers for them to participate in physical activity. The results showed that the motives among these women civil servants were significantly different (f (2, 438) = 2.12, p =.003; Wilks’ Lambda = .91) and were significantly correlated (r = .20, n =447, p < .01) with their physical activity levels. In addition, the results have showed that the barriers to physical activity participation and physical activity levels were also significantly different ( f (4, 436) = 4.86, p =.00; Wilks’ Lambda = .74) and correlated (r = .41, n =447, p < .01) It can be concluded that women in different level perceived different motives and barriers in order to participate in physical activity, while motives and barriers does influence and initiate the movement of physical activity levels among these women from non-active to active women. Therefore, any physical activity intervention attempts should emphasized more on the motives, while reducing barriers in order to enhance these women to be physically active. The findings also recommended an investigation on extensive sample on multiple setting as a future research

Application of charge-coupled devices for astronomical spectroscopy

It has been found, using a charge coupled device detector and a novel on chip pre-binning technique, that qualitative high dispersion spectroscopy is possible with a small telescope and poor seeing. Using the 30 inch Coude telescope at the Royal Greenwich Observatory, an atlas of an M3 giant, HR 5490 has been obtained in a new region of the spectrum i.e. λ 9748Å - λl0153Å. However, more work is needed on the identification of the lines in order to verify this work and to extend the atlas. The readout noise of the charge coupled device camera system was found experimentally during the early stages of system development to be at most 55 electrons. Later work suggests the true figure to be closer to half this and although this is probably still greater than optimum for the device, the charge coupled device camera system has, nonetheless, demonstrated great potential as a detector for astronomical spectroscopic work particularly in the red and near infrared

Dynamic modeling of a stand-alone pem fuel cell connected to adjustable speed drive

Fuel cell has a good potential as a stand-alone generation system and as energy supplied to Adjustable Speed Drive (ASD) model. This is because of its low operation temperature (70ºC until 90ºC) and also it has a good dynamic response. In this project, Proton Exchange Membrane (PEM) fuel cell is used as energy source. Dynamic modeling of a stand-alone PEM fuel cell which connected to several types of ASD system had been modeled by using Matlab/Simulink software. The PEM fuel system has several important sections, namely, fuel cell controller, fuel cell and power conditioning unit. Integrated and proportional controllers are used to control the fuel cell or the hydrogen flow rate that enters the PEM fuel cell. Simulation results show that fuel cell output power can fulfill the load demand in a short duration. Single-phase ASD and three-phase ASD are reviewed as loads in this project and their individual harmonics are investigated based on simulation results. Results also show that ASD generates harmonics to the line voltage and current. A method to reduce harmonics distortion in a network of ASD is proposed in this project. As a result, by combining different types of ASD as network, significant reduction on total harmonics distortion can be obtained

Hydrodynamic characteristics of a rotating spiral fluid-phase contactor

Rotating spiral channels enable any two immiscible fluid phases to flow counter-currently in parallel layers allowing independent control of phase flow rates and layer thicknesses. This opens the possibility of application over the full range of fluid contacting operations, including distillation, absorption, extraction and multiphase reaction with separation. A device has been developed that enables wide-ranging experimental studies to support model refinement and design of first-generation applied devices. In this first work with the new device hydrodynamic characteristics are studied for gas–liquid systems as functions of phase flow rates, rotation rate and liquid viscosity. Measurement of the heavy phase layer thickness, using image analysis based on the Young–Laplace theory for interface shape, and measurement of volume flow rate of each phase and pressure and temperature in the spiral channel allows rigorous comparisons with an existing ‘wide-channel’ model relating flow rates and layer thicknesses to phase properties, geometry and rotation rate. The measured thickness of the heavy-phase layer is predicted well by the wide-channel model at high rotation and phase flow rates, where the deviation from a uniform layer thickness due to menisci at the channel end walls and interface tilt from gravity are small. At low rotation rates, where significant meniscus height and tilt develop, the layer thickness is over-predicted by the wide channel model. The sub 20 µm heavy-phase layer thicknesses measured suggest operation at optimum thickness is possible with the rotating spiral over a wide range of phase and solute systems

Development of Terrain Analysis Database Using Military Geographic Information System

The Information and Communication Technology (ICT) that includes military geospatial information will play a key role in the Revolution of Military Affair (RMA) for future warfare. The Terrain Analysis (TA) database is one of the military geospatial information that needs to be established in the Malaysian Armed Forces (MAF) in order to enable various Military Geographic Information System (MGIS) to perform analyses and produce Tactical Decision Aids (TDA) products. This study focused on the establishment of TA database structure that consisted of several layers namely Surface Configuration - Slope, Vegetation, Surface Material - Soils, Surface Drainage, Transportation and Obstacle Layers. A prototype T A database was established in order to evaluate the effectiveness of the database in generating Cross Country Movement (CCM) map. Results revealed that the topographic data from Department of Survey and Mapping Malaysia in Topologized Topographic Mapping (TTM) database, soil data from Department of Agriculture and the analyses of IKONOS imagery and ground data collection using GPS Geo Explorer 3 have contributed significantly to the development of prototype TA database. GIS technology was thoroughly utilized in implementing a user interface menu and CCM map from prototype TA database. Results showed that GIS technology has provided a powerful tool in successfully generating both products

Automatic Generation Control System: The Impact of Battery Energy Storage in Multi Area Network

Renewable energy sources (RES) are currently experiencing significant expansion, and the integration of these sources into power systems necessitates more complex auxiliary facilities. Battery energy storage systems (BESS) have been widely recognized in recent literature as an effective means of enhancing control capabilities. This study focuses on the implementation of an Automatic Generation Control (AGC) system with the integration of BESS in a multi-area network. Maintaining system frequency, especially during peak loads, poses challenges for AGC systems. The objective of this study is to investigate the utilization of BESS to enhance AGC for frequency control in power system networks. Additionally, the effectiveness of BESS in improving frequency control in multi-area networks is demonstrated through several case studies. The AGC and BESS simulations were conducted using MATLAB Simulink to evaluate the proposed frequency control method's effectiveness. &nbsp

Automatic Generation Control System: The Impact of Battery Energy Storage in Multi Area Network

Renewable energy sources (RES) are currently experiencing significant expansion, and the integration of these sources into power systems necessitates more complex auxiliary facilities. Battery energy storage systems (BESS) have been widely recognized in recent literature as an effective means of enhancing control capabilities. This study focuses on the implementation of an Automatic Generation Control (AGC) system with the integration of BESS in a multi-area network. Maintaining system frequency, especially during peak loads, poses challenges for AGC systems. The objective of this study is to investigate the utilization of BESS to enhance AGC for frequency control in power system networks. Additionally, the effectiveness of BESS in improving frequency control in multi-area networks is demonstrated through several case studies. The AGC and BESS simulations were conducted using MATLAB Simulink to evaluate the proposed frequency control method's effectiveness. &nbsp

Generation, Evolution, and Characterization of Turbulence Coherent Structures

Turbulence stands as one of the most complicated and attractive physical phenomena. The accumulated knowledge has shown turbulent flow to be composed of islands of vortices and uniform-momentum regions, which are coherent in both time and space. Research has been concentrated on these structures, their generation, evolution, and interaction with the mean flow. Different theories and conceptual models were proposed with the aim of controlling the boundary layer flow and improving numerical simulations. Here, we review the different classes of turbulence coherent structures and the presumable generation mechanisms for each. The conceptual models describing the generation of turbulence coherent structures are generally classified under two categories, namely, the bottom-up mechanisms and the top-down mechanisms. The first assumes turbulence to be generated near the surface by some sort of instabilities, whereas the second assigns an active role to the large outer layer structures, perhaps the turbulent bulges. Both categories of models coexist in the flow with the first dominating turbulence generation at low Reynolds number and the second at high Reynolds number, such as the case in the atmospheric boundary layer