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

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

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

Developing Low-Conductance Window Frames: Capabilities and Limitations of Current Window Heat Transfer Design Tools

While window frames typically represent 20-30% of the overall window area, their impact on the total window heat transfer rates may be much larger. This effect is even greater in low-conductance (highly insulating) windows that incorporate very low-conductance glazing. Developing low-conductance window frames requires accurate simulation tools for product research and development. Based on a literature review and an evaluation of current methods of modeling heat transfer through window frames, we conclude that current procedures specified in ISO standards are not sufficiently adequate for accurately evaluating heat transfer through the low-conductance frames. We conclude that the near-term priorities for improving the modeling of heat transfer through low-conductance frames are: (1) Add 2D view-factor radiation to standard modeling and examine the current practice of averaging surface emissivity based on area weighting and the process of making an equivalent rectangular frame cavity. (2) Asses 3D radiation effects in frame cavities and develop recommendation for inclusion into the design fenestration tools. (3) Assess existing correlations for convection in vertical cavities using CFD. (4) Study 2D and 3D natural convection heat transfer in frame cavities for cavities that are proven to be deficient from item 3 above. Recommend improved correlations or full CFD modeling into ISO standards and design fenestration tools, if appropriate. (5) Study 3D hardware short-circuits and propose methods to ensure that these effects are incorporated into ratings. (6) Study the heat transfer effects of ventilated frame cavities and propose updated correlations

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

Predicted and in situ performance of a solar air collector incorporating a translucent granular aerogel cover

This is the post-print version of the Article. The official published version can be accessed from the link below - Copyright @ 2012 ElsevierThere is an opportunity to improve the efficiency of flat plate solar air collectors by replacing their conventional glass covers with lightweight polycarbonate panels filled with high performance aerogel insulation. The in situ performance of a 5.4m2 solar air collector containing granular aerogel is simulated and tested. The collector is incorporated into the external insulation of a mechanically ventilated end terrace house, recently refurbished in London, UK. During the 7 day test period, peak outlet temperatures up to 45 °C are observed. Resultant supply and internal air temperatures peak at 25–30 and 21–22 °C respectively. Peak efficiencies of 22–36% are calculated based on the proposed design across a range of cover types. Measured outlet temperatures are validated to within 5% of their predicted values. Estimated outputs range from 118 to 166 kWh/m2/year for collectors with different thickness granular aerogel covers, compared to 110 kWh/m2/year for a single glazed collector, 140 k h/m2/year for a double glazed collector and 202 kWh/m2/year for a collector incorporating high performance monolithic aerogel. Payback periods of 9–16 years are calculated across all cover types. An efficiency up to 60% and a payback period as low as 4.5 years is possible with an optimised collector incorporating a 10 mm thick granular aerogel cover.This work is supported by the EPSRC, Brunel University, Buro Happold Ltd. and the Technology Strategy Board