PENGARUH MODEL PEMBELAJARAN KOOPERATIF TIPE STAD DENGAN BERBASIS MEDIA INTERAKTIF TERHADAP KEMAMPUAN PEMAHAMAN KONSEP

Penelitian ini bertujuan untuk mengetahui pengaruh model pembelajaran kooperatif tipe STAD berbasis media interaktif terhadap kemampuan pemahaman konsep siswa SD. Penelitian ini menggunakan metode Quasi Experiment Nonequivalent Control Group Design. Subjek penelitian adalah siswa SDN 2 Pangkalan Baru Kabupaten Bangka Tengah Provinsi Bangka Belitung. Kelompok eksperimen diberikan perlakuan pembelajaran kooperatif tipe STAD berbasis media interaktif, kelompok kontrol diberikan pembelajaran konvensional. Hasil penelitian menunjukkan pemahaman konsep kelas eksperimen nilai rata-rata 75,6 menjadi 83,6 (meningkat 8,0); kelas kontrol 73,4 menjadi 80,6 (meningkat 7,2). Disimpulkan, penggunaan model pembelajaran kooperatif tipe STAD berbasis media interaktif terhadap kemampuan pemahaman konsep lebih efektif dari pada model konvensional. ; The aim of study is to know influence of cooperative teaching model STAD type based on interactive media to conceptual comprehension skill of elementary school student. It used Quasi Experiment Nonequivalent Control Group Design. Subject is student of SDN 2 Pangkalan Baru Kabupaten Bangka Tengah Provinsi Bangka Belitung. Experiment group given by treatment of cooperative teaching model STAD type based on interactive media, control group given by conventional model. Result of study show the average value of experiment group 75,6 become 83,6 (increase 8,0); class control 73,4 become 80,6 (increase 7,2). Concluded, usage of cooperative teaching model STAD type based on interactive media to conceptual comprehension skill is more effective than conventional model

Pengaruh Penerapan Media Audio Visual Terhadap Penguasaan Keterampilan Dasar Push Dalam Pembelajaran Hoki di SMA Negeri 26 Bandung

Permasalahan yang diteliti dalam penelitian ini dilatarbelakangi oleh pengamatan penulis mengenai pembelajaran hoki khususnya push karena keterampilan push sering dilakukan dalam permainan hoki dan push harus dikuasai agar permainan hoki dapat dimainkan. Rumusan masalah dalam penelitian ini apakah media audio visual berpengaruh terhadap penguasaan keterampilan dasar push dalam pembelajaran hoki di SMA Negeri 26 Bandung?. Tujuan dalam penelitian ini untuk mengetahui pengaruh penerapan media audio visual terhadap penguasaan keterampilan dasar push. Metode penelitian yang digunakan adalah metode eksperimen, dengan desain penelitian pretest posttest control group design. Populasi dalam penelitian ini adalah semua siswa yang mengikuti kegiatan ekstrakurikuler hoki di SMA Negeri 26 Bandung. Teknik pengambilan sampel menggunakan sampling jenuh. Instrumen penelitian yang digunakan adalah tes keterampilan push FPOK UPI. Hasil dari nilai rata-rata tes awal kelompok eksperimen sebesar 12,50 dan nilai rata-rata tes akhir sebesar 22,00. Sedangkan hasil kelompok kontrol sebesar 12,00 dan tes akhir sebesar 12,30. Berdasarkan Hasil uji hipotesis satu pihak nilai t hitung adalah sebesar 13.510 dengan sig 0.00. Karena sig <0.05 maka dapat disimpulkan bahwa Ho ditolak, artinya media audio visual berpengaruh secara signifikan terhadap penguasaan keterampilan dasar push dalam pembelajaran hoki di SMA Negeri 26 Bandung. --- Problems studied in this research is motivated by the writer's observation about learning hockey particular push because of skill push frequently done in the game hockey and push should be controlled by so that the game hockey can played. The problems of this study whether audio-visual media influence the motion control of the Push in learning hockey at SMA Negeri 26 Bandung?. The goal in the study to find out of the influence of the implementation of the media audio visual against matery push basic skills. The method used is the experimental method, the pretest-posttest control group design. Objects in this study were all students who take hockey extracurricular activities in SMA Negeri 26 Bandung. The sampling technique using saturated sampling. The research instrument used was a test skill push FPOK UPI. The results of the value of the average test the beginning of the group experiments of 12,50 and the value of an average of the end of 22,00. While the results of a control group of 12,00 and the end of 12,30. According to the test hypothesis one the value t is 13,510 with sig 0.00. because sig <0.05 then can be conclude that Ho rejected, it means that significant effect on the motion basic skills push in learning hockey at SMA Negeri 26 Bandung

The Influence of Icephobic Nanomaterial Coatings on Solar Cell Panels at High Latitudes

Solar energy’s penetration at high latitudes has been boosted during recent years, but snow deposits during the winter still limit its exploitation. Therefore, various solutions for snow removal, such as icephobic coatings, increasing panels’ tilt angle, and using wind flows, are being attempted to reduce snow and ice accumulation. The novelty of this study is that it presents insights into the snow-related issues of photovoltaic plants in Norway and proposes a preliminary approach to modelling these issues’ influences at high latitudes using a co-simulation approach. The workflow is based on a combination of PVsyst and Marion’s algorithm, and moves from the assessment of snow deposits on photovoltaic panels and the consequent reduction of plane of array (POA) irradiance (snow losses) to evaluating the influence of icephobic nanomaterials on snow losses. Solar analyses are performed on a photovoltaic plant located in Trondheim, Norway, and then reiterated considering the climate of the Norwegian cities of Bergen and Oslo. The snow losses between November and April, when the snow depth is greater than zero, are 32.75 kWh/m2 in Oslo, 25.05 kWh/m2 in Trondheim, and 5.85 kWh/m2 in Bergen. The application of icephobic coatings currently available on the market will reduce such snow losses to 12.05 kWh/m2 (65% efficiency) in Oslo, 10.00 kWh/m2 (60% efficiency) in Trondheim, and 3.35 kWh/m2 (45% efficiency) in Bergen. In conclusion, the application of icephobic coatings should be more greatly boosted in a continental climate (Oslo and Trondheim) than in an oceanic climate (Bergen) to maximize photovoltaic power output.publishedVersio

THE USE OF SMARTPHONE AND STUDENTS’ LEARNING STRATEGIES IN LEARNING ENGLISH

The purpose of this research was to investigate whether or not the smartphone use influence students’ learning strategies. The students of Islamic Economy Department that currently enrolled in English class were taken as the sample of this research. Correlational study was applied with further regression analysis conducted on the collected data. The instruments used in this research were questionnaires and interview. The findings revealed that the use of smartphone influence students’ learning strategies. Furthermore, cognitive and social/affective strategies are the strategies that were influenced the most and metacognitive strategies were influenced the least by the use of smartphone in learning English. The cognitive and social/affective were influenced the most since the students mostly use smartphone in learning English for specific task or direct answers, and also use smartphone to post or chat in English using social media. Keywords: Smartphone use, learning strategie

Impacts of Operating Hardware on Window Thermal Performance

ABSTRACT Windows are responsible for about 40 percent of the heat loss through typical building envelopes so lowering window frame and glazing unit U-factors will reduce the impact of windows on the energy use in buildings. The thermal effects of operating hardware are currently ignored in the relatively low performing double pane windows common today, but may become significant in high performance windows. This paper describes simulation studies analyzing thermal-bridging effects of non-continuous operating (and non-operating) hardware in common casement style window frame designs. We use finite volume computational fluid dynamics modeling to demonstrate the change in frame sill profile U-factor for configurations using typical hardware systems. Some conclusions can be drawn regarding the impacts of operating hardware on the thermal performance based on the individual frames profiles, although few general trends can be observed due to the large design differences between each frame section modeled in this study. Two of the three out-opening casement profiles modeled show reduced performance greater than 0.05 W/(m 2 K), which may be significant when carried to whole windows in National Fenestration Rating Council (NFRC) and International Organization for Standardization (ISO) rating systems. Fastener types, hardware location within the frame, and other factors related to the method of hardware implementation may significantly impact the effect of hardware on the frame. Neither the base performance level nor the primary frame material appears to determine the thermal effect of hardware based on those metrics alone. INTRODUCTION Minimizing thermal transmittance (U-factor) of building envelopes through the optimization of materials and components is a key energy-efficiency strategy. Windows are responsible for about 40 percent of the heat loss through typical building envelopes so lowering window frame and glazing unit U-factors will reduce the impact of windows on the energy use in buildings

Interior insulation retrofit of a historical brick wall using vacuum insulation panels: Hygrothermal numerical simulations and laboratory investigations

Old listed buildings need to be retrofitted to reduce the energy use for heating. The possible thickness of the insulation layer is limited by the existing construction. Vacuum insulation panels (VIPs) require less thickness than conventional insulation materials to reach the same thermal resistance. Therefore, it could be more appropriate to use VIPs than conventional insulation materials when retrofitting the building envelope of listed buildings. The aim of this study is to investigate the hygrothermal performance of a brick wall with wooden beam ends after it was insulated on the interior with VIPs. One- and two-dimensional hygrothermal numerical simulations were used to design a laboratory study in a large-scale building envelope climate simulator. The wall was exposed to driving rain on the exterior surface and a temperature gradient. The relative humidity in the wall increased substantially when exposed to driving rain. The moisture content in the wooden beams also increased. There was no significant difference between the relative humidity in the wooden beam ends for the cases with and without VIPs. However, it was found that the reduced temperature in the brick after the VIPs were added led to a higher relative humidity in the wooden beams. It was also clear that when VIPs were added to the interior, the drying capacity to that side of the wall was substantially reduced. Finally, calculations of the U-value showed a large potential to reduce the energy use using VIPs on the interior of brick walls

Accelerated Climate Ageing of Building Materials, Components and Structures in the Laboratory

Building materials, components and structures have to fulfil many functional demands during the lifetime of a building. Therefore, it is important to require satisfactory durability of these materials, components and structures. In fact, one single material failure may jeopardize whole components as well as structures. Unfortunately, experience shows that building products too often do not satisfy the various requirements after a relatively short period of use, i.e. the expected service life is considerably shorter than foreseen. This results in increased and large costs due to increased maintenance, extensive replacements of the specific building products and any possible consequential building damages. In addition, health hazards with respect to both risk and consequence may also become an issue. To avoid this, the solution is to apply building products which have properly documented adequate and satisfactory long-term durability. That is, building products which have been subjected to long-term natural outdoor climate exposure or appropriate accelerated climate ageing in the laboratory. This study examines the main climate exposures and how these may be reproduced in the laboratory in various ways. Thus, crucial properties of building products and their durability towards climate strains may be investigated within a relatively short time frame compared with natural outdoor climate ageing. Examples of miscellaneous climate ageing laboratory apparatuses, ageing methods and building product properties to be tested before, during and after ageing are given. A calculation method for estimating acceleration factors is also discussed. Various ageing examples are shown and discussed. A special note is made towards accelerated climate ageing of new and advanced materials being developed. Hence, this study addresses durability and the versatile and powerful application of accelerated climate ageing which is an all too overlooked field within materials science and engineeringsubmittedVersionThis is the authors' accepted and refereed manuscript to the article. The final publication is available at http://www.dx.doi.org/10.1007%2Fs10853-012-6349-

Building integrated photovoltaics: A concise description of the current state of the art and possible research pathways

Nanofluids are considered a promising choice for several heat transfer applications. With the increasing awareness for energy saving and efficiency improvement in various thermal systems, including refrigeration systems, there is a growing interest in the refrigerant-based nanofluids owing to their superior thermo-physical properties. Nanorefrigerants are a class of nanofluid, which consist of suspended nanoparticles in a base refrigerant. In this paper, it is intended to include many articles on refrigeration systems that use nanorefrigerants, published in the period from 2005 to 2015. Although this is an extensive review, it could not include all the papers, and only some major research works were selected. It is believed that the dependency of thermal conductivity and other properties on temperature will make the thermal systems more efficient while operating at a high temperature. The literature reviews associated with the performance characteristics of nanorefrigerants in refrigeration systems for the last 10 years have been compiled and presented in this paper. Furthermore, recent studies related to thermo-physical properties of nanorefrigerants and nanolubricants have also been summarized and reviewed in this paperAcknowledgments: This work has been supported by the Research Council of Norway and several partners through the research project “Building Integrated Photovoltaics for Norway” (BIPV Norway).publishedVersio