Perbandingan Hasil Belajar Fisika Antara Model Gi Dengan Stad Melalui Metode Eksperimen

This study has a purpose to know: 1) The differences in physics learning outcomes of students’ through cooperative learning GI (Group Investigation) and STAD (Student Teams Achievement of Division) with experimental method. 2) The higher average study result between cooperative learning GI and STAD with experimental method. This study used a quasi experimental design. The instrument to collect data was a test, which consists of 10 questions for 70 students. The results showed: a) There are differences in the study result of students through cooperative learning GI and STAD with experimental method, b)The average study result, which uses cooperative learning GI is more higher than STAD.Penelitian ini bertujuan untuk mengetahui: 1) perbedaan hasil belajar fisika siswa melalui model pembelajaran kooperatif tipe GI (Group Investigation) dan STAD (Students Teams Achievement Of Division) dengan metode eksperimen. 2) rata-rata hasil belajar yang lebih baik melalui model pembelajaran kooperatif tipe GI dan STAD dengan metode eksperimen. Penelitian ini menggunakan Quasi eksperimental design. Alat pengumpul data berupa tes soal sebanyak 10 soal kepada 70 siswa. Hasil penelitian menunjukkan; a) ada perbedaan hasil belajar siswa melalui model pembelajaran kooperatif tipe GI dan STAD dengan metode eksperimen, b) rata-rata hasil belajar yang menggunakan model pembelajaran kooperatif tipe GI lebih tinggi dibandingkan STAD

Penerapan Metode Pembelajaran Lesson Study untuk Meningkatkan Hasil Belajar Geografi Siswa SMA Negeri Sawang Kabupaten Aceh Selatan

Model pembelajaran Lesson Study merupakan suatu proses dalam pengembangan profesionalitas guru dengan jalan menyelidiki atau menguji praktik mengajar mereka agar menjadi lebih efektif. Tujuan penelitian untuk mengetahui (1) Peningkatan hasil belajar; (2) Aktivitas guru dan siswa dalam kegiatan pembelajaran; (3) Keterampilan guru dalam mengelola pembelajaran; dan (4) Respon siswa setelah mengikuti proses pembelajaran menggunakan model pembelajaran lesson study di SMAN Sawang Aceh Selatan. Subjek penelitian adalah siswa kelas XI SMAN Sawang Aceh Selatan yang berjumlah 33 siswa. Pengumpulan data dilakukan dengan menggunakan tes hasil belajar, lembar pengamatan aktivitas guru dan siswa, lembar pengamatan keterampilan guru dan pengamatan respon siswa terhadap model pembelajaran lesson study. Analisis data menggunakan statistik deskriptif persentase. Hasil penelitian menunjukkan bahwa (1) Persentase ketuntasan secara individual meningkat pada siklus I terdapat 28 siswa tuntas dan pada siklus II terdapat 33 siswa tuntas sedangkan persentase ketuntasan klasikal juga meningkat dari 70% pada siklus I menjadi 90% pada siklus II; (2) Aktivitas guru dan siswa dari siklus I sampai siklus II telah mencerminkan penerapan menggunakan metode pembelajaran; (3) Keterampilan guru dalam mengelola pembelajaran dengan menggunakan model pembelajaran lesson study meningkat, hal ini terlihat pada siklus I diperoleh skor 2,36 dan pada siklus II diperoleh 2,7 dengan katagori baik; dan (4) Respon siswa setelah mengikuti pembelajaran antara lain 84,8 persen siswa menjawab metode yang diajarkan masih baru dan suasana kelas menyenangkan, 93,9 persen siswa menjawab dapat memahami pembelajaran dan materi yang dipelajari menarik, 87,8 persen siswa menjawab model pembelajaran menarik.75,7 persen siswa mengatakan penampilan guru menarik, 96,9 persen siswa menjawab dapat memotivasi siswa, suasana kelas menarik dan berminat mengikuti pembelajaran menggunakan model pembelajaran lesson stud

Pengaruh Laju Aliran Air Sistem Evaporative Cooling terhadap Temperatur Sistem Mesin Pengkondisian Udara

Evaporative Cooling is an air conditioning system that uses water to cool and add moisture or humidity in the air flow, so ball temperature is dry become cooler before experiencesublimate process. Media temperature change influence coolant to water debit change whichis if water temperature the greater, therefore resulting water debit will get little conversely if water temperature gets little, therefore resulting water debit will be even greater. Media temperature change influence water cooler to its air humidity if coolant media temperature the greater therefore resulting air humidity also the greater too. On this research streaming debit that result effectiveness at the best which is in a row 1,2, 1,04, and 0,8 liters / minutes. Besides with marks sense purpose increase evaporative cooling can make kompresor'scharges gets demulcent

Kaji Eksperimental Standby Mode Beban 1000 WATT pada Residential Air Conditioning Hibrida sebagai Penyejuk Udara Ruangan dan Pemanas Air/Pengering

In the Air Conditioning engine, the resulting cooling effect is used to cool the room and the heat effect that is simply thrown into the environment. While, the Hybrid Residential Air Conditioning machine is utilizes the cooling effect and the simultaneous heating effect of the refrigeration machine. Chiller is a cooling system that uses cooling media (water or brine) and HCR-22 as a working fluid. The purpose of this study is to determine the consumption of electrical energy, by using standby mode method with 1000 Watt cooling load in this research got the average value Coefficient Of Performance (COP) of 2.471, average value Performance of Factor(PF) of 3.43, average value Total of Performance (TP) of 5.90. For the average temperature in the cooling chamber is 28.20 0C, the average temperature in the heating chamber is 44.64 0C, with an average compressor power of 1.2680 kW and electricity consumption in 2 hours of working of 2.5359 kWh

Global stability analysis of birhythmicity in a self-sustained oscillator

We analyze global stability properties of birhythmicity in a self-sustained system with random excitations. The model is a multi-limit cycles variation of the van der Pol oscillatorintroduced to analyze enzymatic substrate reactions in brain waves. We show that the two frequencies are strongly influenced by the nonlinear coefficients $\alpha$ and $\beta$. With a random excitation, such as a Gaussian white noise, the attractor's global stability is measured by the mean escape time $\tau$ from one limit-cycle. An effective activation energy barrier is obtained by the slope of the linear part of the variation of the escape time $\tau$ versus the inverse noise-intensity 1/D. We find that the trapping barriers of the two frequencies can be very different, thus leaving the system on the same attractor for an overwhelming time. However, we also find that the system is nearly symmetric in a narrow range of the parameters.Comment: 17 pages, 8 figures, to appear on Choas, 201

Perception des paysans sur la contrainte de la mineuse de l'épi Heliocheilus albipunctella De Joannis, ravageur important du mil en zone sahélienne

Heliocheilus albipunctella De Joannis est un important ravageur des épis du mil en zone sahélienne. Pour documenter la perception des paysans par rapport à ce ravageur, une enquête a été réalisée en avril 2016 avec un échantillon de 732 producteurs dans cinq principales régions agricoles du Niger. Les résultats obtenus ont montré que: 1) 17 % des répondants ont pu décrire le cycle biologique de H. albipunctella; 2) le ravageur cause en moyenne 43 à 82 % de perte de production, une moyenne obtenue depuis 28 ans selon les régions; 3) 37 à 78 % des producteurs savent que les infestations des épis du mil sont favorisées par les semis précoces, les sécheresses et la nature sableuse du sol; 4) d'après la moitié des répondants le plus de dégâts sont observés au stade grenaison du mil; 5) plus de 80 % des producteurs ne connaissent aucune méthode de lutte contre ce ravageur. Ces informations interpellent sur l'incidence négative de H. albipunctella sur le rendement du mil dans ces zones précaires. La nécessité de développer un programme participatif de gestion intégrée de ce ravageur est recommandée

The structure of the atomic helium trimers: Halos and Efimov states

The Faddeev equations for the atomic helium-trimer systems are solved numerically with high accuracy both for the most sophisticated realistic potentials available and for simple phenomenological potentials. An efficient numerical procedure is described. The large-distance asymptotic behavior, crucial for weakly bound three-body systems, is described almost analytically for arbitrary potentials. The Efimov effect is especially considered. The geometric structures of the bound states are quantitatively investigated. The accuracy of the schematic models and previous computations is comparable, i.e. within 20% for the spatially extended states and within 40% for the smaller ^4He-trimer ground state.Comment: 32 pages containing 7 figures and 6 table

Stability of Solid State Reaction Fronts

We analyze the stability of a planar solid-solid interface at which a chemical reaction occurs. Examples include oxidation, nitridation, or silicide formation. Using a continuum model, including a general formula for the stress-dependence of the reaction rate, we show that stress effects can render a planar interface dynamically unstable with respect to perturbations of intermediate wavelength

QuantUM: Quantitative Safety Analysis of UML Models

When developing a safety-critical system it is essential to obtain an assessment of different design alternatives. In particular, an early safety assessment of the architectural design of a system is desirable. In spite of the plethora of available formal quantitative analysis methods it is still difficult for software and system architects to integrate these techniques into their every day work. This is mainly due to the lack of methods that can be directly applied to architecture level models, for instance given as UML diagrams. Also, it is necessary that the description methods used do not require a profound knowledge of formal methods. Our approach bridges this gap and improves the integration of quantitative safety analysis methods into the development process. All inputs of the analysis are specified at the level of a UML model. This model is then automatically translated into the analysis model, and the results of the analysis are consequently represented on the level of the UML model. Thus the analysis model and the formal methods used during the analysis are hidden from the user. We illustrate the usefulness of our approach using an industrial strength case study.Comment: In Proceedings QAPL 2011, arXiv:1107.074