Stamina of a non-gasketed flange joint under combined internal pressure, axial and bending loading : an experimental study

The performance of a bolted flange joint is characterized mainly by its 'strength' and 'sealing capability'. A number of numerical and experimental studies have been conducted to study these characteristics under internal pressure loading conditions alone. However, limited work is found in the literature under conditions of combined internal pressure and axial loading. The effect of external, axial loading pressure being unknown, the optimal performance of the bolted flange joint cannot be achieved. Current design codes do not address the effects of axial loading on structural integrity and sealing ability. To study joint strength and sealing capability under combined loading conditions, an extensive experimental and numerical study of a non¬gasketed flange joint was carried out. Actual joint load capacity was determined at both design and test stages with the maximum external axial loading that can be applied for safe joint performance. Experimental and numerical results have been compared and overall joint performance and behaviour is discussed in detail

Exploring EFL Teacher Educators’ Goals in Teaching English Oral Communication Skill

The study reported in this article sought to explore teacher educators’ (TEs) perceived goals in teaching English oral communication in an English Education Program in Indonesia. Using a case study method, data for the present study were collected from all TEs teaching English speaking and listening subjects. A semi-structured interview protocols were carried out in English and Indonesian languages. All interview transcripts were transcribed verbatim and analysed using a thematic analysis method. The findings indicate that many of the TEs stress production when teaching oral communication. When asking about the purposes of teaching speaking or listening, they rarely mentioned any expectations that their PSTs would be independent and knowledgeable when dealing with oral communication breakdowns.  Yet, this does not necessarily suggest any problems with TEs’ teaching practices and may instead indicate limited opportunities for PSTs to learn how to deal with oral communication breakdowns in the classroom. The findings of this study, thus, shed lights into current understanding of how teacher educators in Indonesia engage in the preparation of school English teachers’ candidates in the domain of oral communication skills

Pengaruh Prestasi Belajar, Pengembangan Karir dan Aktualisasi Diri Terhadap Minat Melanjutkan Pendidikan ke Perguruan Tinggi Siswa SMK di Kota Yogyakarta

Penelitian ini bertujuan untuk mengetahui pengaruh prestasi belajar, pengembangan karir, dan aktualisasi diri terhadap minat siswa SMK di kota Yogyakarta untuk melanjutkan pendidikan ke Perguruan Tinggi baik secara parsial maupun secara simultan. Penelitian ini termasuk jenis penelitian expost facto, dan merupakan penelitian asosiatif bila dilihat dari tingkat kejelasannya (level of explanation). Data yang diperoleh berupa data interval dan rasio, sehingga teknik statistik yang digunakan adalah teknik statistik inferensial parametris. Penelitian ini menggunakan dua macam variabel, 1) Variabel Bebas, yaitu: Prestasi Belajar (X1), Pengembangan Karir (X2), Aktualisasi Diri (X3); 2) Minat Melanjutkan Pendidikan ke Perguruan Tinggi Siswa SMK di kota Yogyakarta (Y) sebagai variabel terikatnya. Teknik pengambilan datanya menggunakan kuesioner untuk mengumpulkan data dari variabel X2, X3, dan Y. sedangkan untuk variabel X1 pengumpulan datanya menggunakan teknik dokumentasi data prestasi belajar siswa (responden). Sampel dalam penelitian ini adalah siswa kelas 3 di SMKN2 Yogyakarta, SMKN3 Yogyakarta, SMK Muhammadiyah 3 Yogyakarta dan SMK PIRI 1 Yogyakarta yang seluruhnya berjumlah 97 responden. Teknik analisis data yang digunakan adalah teknik analisis korelasi product moment dan analisis regresi ganda dengan tiga prediktor. Pengujian hipotesis dengan tingkat signifikansi (α) sebesar 0,05, dengan dk = 95 dan uji dilakukan dengan satu sisi, menunjukan bahwa ; 1) Terdapat pengaruh yang signifikan antara prestasi belajar terhadap minat melanjutkan pendidikan ke perguruan tinggi, dengan kontribusi sebesar 23,43% dan sisanya 76,57% ditentukan oleh variabel lain ; 2) Terdapat pengaruh yang signifikan antara pengembangan karir terhadap minat melanjutkan pendidikan ke perguruan tinggi, dengan kontribusi sebesar 15,92% dan sisanya 84,08% ditentukan oleh variabel lain ; 3) Terdapat pengaruh yang signifikan antara aktualisasi diri terhadap minat melanjutkan pendidikan ke perguruan tinggi, dengan kontribusi 30,8% dan sisanya 69,12% ditentukan oleh variabel lain ; 4) F hitung lebih besar dari pada F tabel atau 17,990 > 2,707 yeng berarti terdapat pengaruh yang signifikan antara variabel prestasi belajar, pengembangan karir dan aktualisasi diri secara simultan terhadap minat melanjutkan pendidikan ke Perguruan Tinggi siswa SMK di kota Yogyakarta, dengan kontribusi sebesar 36,7% sedangkan sisanya atau sebasar 63,3% dipengaruhi oleh Variabel lain

Determination of load capacity of a nongasketed flange joint under combined internal pressure, axial and bending loading for safe strength and sealing

Performance of a bolted flange joint is characterized mainly due to its ‘strength’ and ‘sealing capability’. A number of analytical and experimental studies have been conducted to study these characteristics only under internal pressure loading. A very limited work is found in literature under combined internal pressure and bending loading. Due to the ignorance of external loads i.e. bending and axial in addition to the internal pressure loading, an optimized performance of the bolted flange joint can not be achieved. The present design codes do not address the effects of combined loading on the structural integrity and sealing ability. To investigate joint strength and sealing capability under combined loading, an extensive comparative experimental and numerical study of a non-gasketed flange joint with two different taper angles on the flange surface and with different load combinations is carried out and overall joint performance and behavior is discussed. Actual joint load capacity is determined under both the design and proof test pressures with maximum additional external loading (axial and bending) that can be applied for safe joint performance

KWH METER DIGITAL PRABAYAR UNTUK SKALA RUMAH TANGGA DENGAN MENGGUNAKAN SISTEM VOUCHER Sub Judul : PENGAMANAN SISTEM M-VOUCHER

Pada umumnya KWH meter yang digunakan oleh PLN adalah KWH meter analog. Tetapi KWH ini mempunyai kelemahan, salah satunya adalah dengan sistem pembayaran paskabayar, dapat memungkinkan pelanggan menunggak tagihan listrik. Untuk mengatasi hal tersebut maka dibuat sebuah KWH meter digital dengan sistem prabayar. Sehingga pelanggan harus membeli voucher khusus untuk dapat menggunakan listrik dari PLN. Nilai voucher ini akan terus berkurang seiring dengan pemakaian listrik. Apabila nilai voucher hampir habis akan diberi indikator pemberitahuan dan sistem akan memutus daya apabila nilai voucher habis. Agar dapat menggunakan kembali listrik, maka pelanggan harus membeli voucher khusus lagi. Pembayaran dengan sistem prabayar membuat KWH ini berbeda dengan KWH meter pada umumnya. KWH meter ini akan berfungsi setelah membeli sebuah voucher khusus yang berisi besaran digital (berfungsi sebagai pulsa) sebagai pembanding besaran energi yang digunakan. Sistem secara otomatis akan memutuskan tegangan rumah apabila bila besaran tersebut mencapai nol. Cara pembelian pulsa adalah dengan membeli di dealer-dealer penjual pulsa KWH. Dealer tersebut mengirim sms ke server PLN untuk mendapatkan kode voucher yang sudah terenkripsi. Kemudian dealer tersebut memberikan kode tersebut kepada konsumen. Metode enkripsi yang digunakan akan mengacu pada mesin enigma, teknologi enkripsi yang berupa simulasi penyambungan antara karakter yang satu dengan karakter yang lain mengunakan beberapa komponen yaitu, plugboard, stator, 3 buah rotor dan reflektor. Dalam metode ini dibuat beberapa modifikasi salah satunya yaitu apabila pada umumnya mesin enigma mengolah karakter huruf dan angka, disini metode enigma hanya digunakan untuk mengolah angka

Accelerated micropolar fluid--flow past an uniformly rotating circular cylinder

In this paper, we formulated the non-steady flow due to the uniformly accelerated and rotating circular cylinder from rest in a stationary, viscous, incompressible and micropolar fluid. This flow problem is examined numerically by adopting a special scheme comprising the Adams-Bashforth Temporal Fourier Series method and the Runge-Kutta Temporal Special Finite-Difference method. This numerical scheme transforms the governing equation for micropolar fluids for this problem into system of finite-difference equations. This system was further solved numerically by point SOR-method. These results were also further extrapolated by the Richardson extrapolation method. This scheme is valid for all values of the flow and fluid-parameters and for all time. Moreover the boundary conditions of the vorticity and the spin at points far from the cylinder are being imposed and encountered too. The results are compared with existing results (for non-rotating circular cylinder in Newtonian fluids). The comparison is good. The enhancement of lift and reduction in drag was observed if the micropolarity effects are intensified. Same is happened if the rotation of a cylinder increases. Furthermore, the vortex-pair in the wake is delayed to successively higher times as rotation parameter increases. In addition, the rotation helps not only in dissolving vortices adjacent to the cylinder and adverse pressure region but also in dissolving the boundary layer separation. Furthermore, the rotation reduces the micropolar spin boundary layer also

The stamina of non-gasketed, flanged pipe connections

Stress variations showing flange yielding, flange rotation, effects of joint tightening sequence, identification of the mode of response to loading (static or dynamic) is discussed. In addition the effects of re-tightening, importance of high quality bolting with proper surface treatment and use of proper tooling are also discussed

Tachometer Based Mikrokontroller Atmega16 With Electromagnetic Induction Method On Spark Plug Wires As Ancillary Equipment Service Light On Motorcycle

The final project was created with the aim of building the hardware, software, and know the performance of the Tachometer Based Mikrokontroller Atmega16 By Electromagnetic induction Method In spark plug Wires As Ancillary Service Light Fixtures on the motorcycle as a tool that can measure the rotation of the engine shaft perminuits. Methods used in constructing mikrokontroller based atmega16 Tachometer with electromagnetic induction method in spark plug wires as ancillary service light fixtures on the motorcycle is made up of: 1) the identification of needs, (2) analysis of needs, (3) Design Method, (4) and (5) Test. This tool works is controlled by a system of mikrokontroller ATmega16 and programmed using software CodeVision AVR based language c. supporting Hardware consists of a power supply circuit based on Regulator 78xx ICS, using seven segment display 2.3 inches, BC547 transistor-IC ULN2803 BC557 as well as a series of drivers, FCS9013 transistor that is used to capture induction and processor as ATmega16 mikrocontroller. After testing, be aware that Hardware can be run well by using the minimum system mikrokotroller ATmega16 combined with other support instruments. While the software is created using software CodeVision AVR also runs very well. However performance Tachometer Based Mikrokontroller Atmega16 By Electromagnetic induction Method In spark plug Wires As Ancillary Equipment Service Light On Motorcycles in general are still not running at maximum because fault reading on high RPM still with an average error of reach 8.24%. Keywords: Tachometer, electromagnetic induction, spark plug Wires, ATMega1