PENGARUH PENGUNAAN MODEL PEMBELAJARAN JOGYUKENYU (LESSON STUDY) TERHADAP PRESTASI BELAJAR MATEMATIKA PADA SEGIEMPAT DITINJAU DARI MINAT BELAJAR (Eksperiment Pembelajaran Pada Siwa Kelas VII Semester 1 SMP N 2 Gatak )

Penelitian ini bertujuan untuk : 1) Menganalisis dan menguji pengaruh model pembelajaran jogyukenyu (lesson study) terhadap prestasi belajar. 2) Menganalisis dan menguji pengaruh minat belajar siswa terhadap prestasi belajar siswa. 3) Menganalisis dan menguji interaksi antara pendekatan pembelajaran dengan minat belajar siswa terhadap prestasi belajar matematika. Populasi penelitian adalah semua kelas VII yang terdidri dari delapan kelas dan sampel sebanyak dua kelas yaitu kelompok eksperimen siswa kelas VII G dengan jumlah 38 siswa, sedangkan kelompok kontrol siswa kelas VIIH dengan jumlah 38 siswa teknik sampling menggunakan cluster random. Metode pengumpulan data adalah metode tes, dokumentasi dan observasi. Teknik analisis data yang digunakan analisis variansi dua jalan dengan frekuensi sel tak sama yang sebelumya dilakukan uji prasyarat yaitu uji normalitas dan uji homogenitas. Hasil pengujian hipotesis menggunakan α = 5 % menunjukan : (1) FA = 7,15 berarti ada pengaruh yang signifikan antara model pembelajaran terhadap prestasi belajar matematika, (ii) FB = 90, 75 berarti ada pengaruh yang signifikan antara minat belajar terhadap prestasi belajar matematika, dan (iii) FAB = 0,14 berarti tidak terdapat interaksi yang signifikan antara model pembelajaran dan minat belajar siswa terhadap prestasi belajar. Penelitian ini menyimpulkan bahwa prestasi belajar menggunakan model pembelajaran jogyukenyu lebih baik dari pada prestasi belajar mengunakan model pembelajaran konvesional. Demikian pula jika ditinjau dari minat belajar siswa, bahwa minat belajar yang lebih tinggi memberikan prestasi belajar lebih baik dari prestasi belajar dari minat sedang maupun rendah

GT2004-53650 A COMPARATIVE AERODYNAMIC AND PERFORMANCE STUDY OF A THREE-STAGE HIGH PRESSURE TURBINE WITH 3-D BOWED BLADES AND CYLINDRICAL BLADES

ABSTRACT To investigate the effect of the blade geometry on blade total pressure loss coefficient, efficiency, and performance, a comparative study is presented that deals with the aerodynamic and performance behavior of a three-stage high pressure research turbine utilizing two different blade types. Keeping the initial conditions and the pressure ratio the same, two different rotors with the same hub and tip diameters are experimentally investigated. The first rotor incorporates 3-D convexly bowed blades, where as the second one utilizes a set of fully cylindrical blades. Using shrouded rotors and stators, the stator rings are correspondingly configured. The research turbine incorporates six rows beginning with a stator row. Interstage aerodynamic measurements are performed at design speeds at three stations, namely downstream of the first rotor row, the second stator row, and the second rotor row. For both rotors, the interstage radial and circumferential traversing present detailed flow pictures of the middle stage. Aerodynamic measurements were carried out at the turbine design speed. The experimental investigations have been carried out on a HP 3-stage gas turbine research facility at the Turbomachinery Performance and Flow Research Laboratory of Texas A&M University

GT2004-53054 THE USE OF ACOUSTIC EMISSION TECHNOLOGY IN COATING DUCTILITY TESTING AT VARIOUS TEMPERATURES

ABSTRACT In this study, tests of ductility and ductile to brittle transition temperature DBTT of both PtAl RT22 and MCrAlY Amdry 997 coatings on both single crystal and polycrystalline substrates (CMSX-4, SCB, and In792) have been carried out. An acoustic emission detection technique that makes the detection of coating failures (micro cracking and delamination) possible has been employed during the tensile tests. The acoustic emission AE detection has been calibrated on the uncoated substrates and on some coated specimens at various testing temperatures and at different strain rate, together with metallurgical examination. A correlation between AE signals and failure types is established. It has been found that the substrate materials generate also some AE signals during plastic deformation. The amplitude of the AE signals depends strongly on the type of substrate material and the testing temperature but slightly on the strain rate. The substrate emissions may disturb the detection of coating failure. However, except for the disturbance from the substrate materials, the AE is still a sensitive, reliable, and useful technique to detect coating failures at various temperatures. The ductility results determined in this study have shown that the overlay coating Amdry 997 has a lower DBTT~550˚C and higher ductilities than the diffusion coating RT22. Both of these differences indicate that Amdry 997 is much more ductile than RT22

GT2004-53529 HEAT TRANSFER CHARACTERISTICS INSIDE TWO-PASS VARIABLE CROSS- SECTION CHANNELS WITH RIBS AND BLEED HOLES

ABSTRACT Heat transfer characteristics were experimentally studied for two-pass channels with variable cross-section with and without ribs. Rectangular ribs were placed symmetrically on two opposite walls with attack angles of 90° and 60° to the main flow. The bleed holes were only distributed on the rib roughened surface along the second pass. The cross-section area of the channel varied in the way that it increased along the first pass and decreased along the second. The relative roughness heights were 0.092 and 0.123; the relative roughness pitches were 10 and 20. The experiments were carried out at Reynolds numbers from 7100 to 60000. Analysis of the experimental results may lead to the following conclusions: (1) The heat transfer was enhanced by the presence of variable cross section. (2) The 60° ribs was not necessarily the optimistic option as published in the literature, test showed that 90° ribs produced a hither heat transfer for the relative roughness height of 0.092. (3) For up to 30% of bleeding were outlet, the existence of bleed holes enhanced the heat transfer process

AN EVALUATION OF THE EFFECT OF AMBIENT CONDITIONS ON THE INTEGRATION OF INLET CONDITIONING SYSTEMS WITH INDUSTRIAL GAS TURBINE ENGINES

ABSTRACT All industrial power systems are influenced by ambient parameters, and power plant output fluctuate