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FLUKTUASI BEDA TEKANAN DARI POLA ALIRAN SLUG AIR-UDARA PADA ALIRAN DUA FASE SEARAH PIPA HORIZONTAL

ROTASI "JURNAL TEKNIK MESIN" VOLUME 14, NOMOR 2, APRIL 2012
Publisher : ROTASI "JURNAL TEKNIK MESIN"

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Abstract

Karakteristik fluktuasi beda tekanan aliran slug dua fase udara-air diselidiki dalam pipa horisontal dengan panjang 10 m dan diameter dalam 24 mm. Tujuan penelitian ini adalah mengidentifikasi karakteristik dari fluktuasi beda tekanan pola aliran slug menggunakan analisis statistik, probability density function (pdf), autokorelasi dan power spectral density (psd). Sebuah sensor Differential Pressure Tansducer (DPT) dipasang untuk merekam fluktuasi beda tekanan aliran slug. Sinyal beda tekanan dikondisikan oleh pressure amplifier/signal conditioning dan diubah menjadi sinyal digital menggunakan peralatan Analog to Digital Converter (ADC). Karakteristik dari fluktuasi beda tekanan aliran slug sangat dipengaruhi oleh kecepatan superfisial fluida. Perubahan kecepatan superfisial udara dan kecepatan superfisial air dapat dibedakan dengan jelas menggunakan analisis statistik, PDF, autokorelasi dan PSD.

PEMISAHAN ALIRAN KEROSEN-AIR (Pada Variasi Sudut Kemiringan Side Arm vertikal keatas)

ROTASI "JURNAL TEKNIK MESIN" VOLUME 14, NOMOR 2, APRIL 2012
Publisher : ROTASI "JURNAL TEKNIK MESIN"

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Abstract

Penelitian mengenai pemisahan fase air-kerosen yang melewati T-junction telah dilakukan. Hasil pemisahan fase akan diamati dengan mengubah sudut kemiringan side arm (branch) dimulai dari posisi vertical keatas 90o, ,60o dan 30o dengan radius belokan 15 mm.Untuk mengamati pengaruh sudut kemiringan side arm terhadap pemisahan fase yang dihasilkan maka dibuatlah seksi uji T-junction dengan diameter pipa horisontal 36 mm, diameter side arm 26 mm (rasio diameter 0,7), bahan pipa adalah acrylic dengan variasi water cut 49% - 70%, kecepatan superfisial air 0,20 ~ 0,39 m/s, kecepatan superfisial kerosene 0,15 ~ 0,25 m/s pada tiga variasi hambatan downstream. Berdasarkan data hasil eksperimen dan visualisasi aliran pada seksi uji, hasil pemisahan fase terbaik dicapai pada sudut kemiringan branch 90o dengan tekanan downstream 107843,5 Pa, watercut 49% yang menghasilkan fraksi kerosene di branch Fk = 94,7% dan fraksi air di branch Fw = 3,4% dengan efisiensi pemisahan fase sebesar η = 95%. Kondisi terbaik diatas diperoleh pada Jw = 0,20 m/s, Jk = 0,22 m/s pada pola aliran Three Layer (3L-2).

KARAKTERISTIK DAN PENDEKATAN KINETIKA GLOBAL PADA PIROLISIS LAMBAT SAMPAH KOTA TERSELEKSI

REAKTOR Volume 13, Nomor 3, Juni 2011
Publisher : Dept. of Chemical Engineering, Diponegoro University

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Abstract

CHARACTERISTICS AND GLOBAL KINETIC APPROACH ON THE SLOW PYROLYSIS OF SELECTED MUNICIPAL WASTE. Municipal Solid Wastes (MSW) has a great potential as a clean renewable feedstock for producing modern energy carriers through thermochemical conversion processes called pyrolysis. However, despite their enormous potential as energy sources, their thermal characteristics are still not well known. In the present study, the pyrolysis characteristics and pyrolysis kinetics of MSW single components (i.e bamboo wastes, banana leaves wastes, wrapping wastes, and styrofoam wastes) and their mixture were investigated. The 20 grams sample were heated in a furnace under nitrogen environment from ambient temperature to 400°C at a heating rate of 10°C/min and held for 30 min. The results of the research showed that bamboo wastes and banana leaves wastes could be catogorized as low stability organics, while wrapping wastes could be catagorized as polymer mixture materials, while styrofoam wastes could be catagorized as plastic materials. The research also revealed that the global kinetic method  could be used to predict the MSW single component activation energy. Sampah kota mempunyai potensi untuk dikembangkan menjadi sumber energi alternatif terbarukan melalui proses pirolisis. Namun demikian, pemahaman mengenai karakteristik termal proses pirolisis dari sampah kota masih belum banyak diketahui. Dalam penelitian ini, dilakukan analisa thermogravimetry dari komponen-komponen tunggal sampah kota yang meliputi sampah bambu, sampah daun, sampah bahan pengemas, dan sampah styrofoam maupun campuran antara komponen-komponen tersebut. Penelitian ini dilakukan untuk mendapatkan karakteristik pirolisis komponen-komponen yang diteliti, meliputi profil proses devolatilisasi dan energi kinetik. Penelitian dilakukan dengan menempatkan sampel seberat 20 gram dalam sebuah tungku dan menaikkan temperatur tungku dengan laju pemanasan 10°C/min. Temperatur akhir sampel dipertahankan pada 400°C  selama 30 menit. Untuk menjamin terjadinya proses pirolisis, maka dialirkan nitrogen dengan laju 100 ml/menit ke dalam reaktor. Hasil penelitian menunjukkan bahwa sampah bambu dan sampah daun pisang dapat dikategorikan kedalam bahan organik dengan kestabila rendah. Sampah bahan pengemas cenderung masuk dalam katagori bahan campuran polimer, sedangkan sampah styrofoam dapat dikategorikan ke dalam material plastik. Hasil penelitian juga menunjukkan bahwa metode kinetika global dapat digunakan untuk memprediksi nilai energi aktivasi dari komponen tunggal sampah kota.

Uji keandlan model sacramento pada DAS Bedadung dan DAS Kloposawit

Jurnal AGROTEKNOLOGI Vol 4, No 1 (2010)
Publisher : Jurnal AGROTEKNOLOGI

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Abstract

Sacramento model is once of rainfall runoff library (RRL) model which used to measure the flo component that include rainfall, evaporation and discharge.

IDENTIFIKASI DAN KLASIFIKASI PERUNTUKAN LAHAN MENGGUNAKAN CITRA ASTER (Landuse Identification and Classification Using ASTER Multispectral Data)

Media Teknik Sipil Vol 9, No 1 (2009): JANUARI 2009
Publisher : Media Teknik Sipil

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Abstract

ASTER (Advanced Space borne Thermal Emission and Reflection Radiometer) is classified as new sensor based on the TERRA satellite developed in the recent years. ASTER has been developed to provide image for monitoring environmental phenomenon. ASTER data offer more option for spatial resolution (60m, 30m and 15m) and more spectral resolution that suppose sufficient to capture main nomenclature of land use than usual imagery (e.g.: Landsat TM). This article shows the process of image treatment, classification, and interpretation of ASTER data to classify land use at Sampean Watershed. Two method of classification (supervised and unsupervised) are then compared to obtain the best classification. Methodology comprise of: pre-processing, survey, classification and interpretation. Classification is conducted using un-supervised and supervised methods. The classification results of these two methods are then compared to digital map (peta RBI). Supervised classification identified 7 main features of land use, while un-supervised classification only identified 3 main class of land use. The works show that supervised classification enhances the number of land use features identified and classified.

Experimental Study on the Effect of Initial Temperature on CHF in a Vertical Annulus Narrow Channel with Bilateral Heated

Atom Indonesia Vol 37, No 2 (2011): August 2011
Publisher : PPIKSN-BATAN

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Abstract

Study on understanding of the complexities of boiling in the narrow channel which was occured in a severe accident on nuclear power plant has been carried out in experimentally using simulation apparatus in order to achieve the safety management capability. Critical Heat Flux (CHF) is one important parameter to control heat during transient accident. The methodology of research is an experiment using experiment apparatus called HeaTiNG-01 test section with modifications in the outside pipe using stainless steel material as the reactor vessel wall simulation. Experiments were conducted by heating the heated rod as a simulation of debris until the desired initial temperature by bilateral heated. Then water with a saturation temperature in atmospheric was poured gravitationally into the narrow channel. Data acquisition system recorded temperature changes in transient during the cooling process. The transient temperature profile in double heating surface and rewetting point (rewet fronts) was characterized. Experiment was conducted at three initial temperature variations i.e. 650oC, 750oC and 850oC and using channel width 1 mm. Experiment data was used to calculate heat flux then to fitting CHF form boiling curve. The results showed that CHF in outer pipe is higher than heated rod, these conditions explain that more heat is released through the outer pipe, so that the heat control can be done from outside the system to reduce the temperature quickly. The average value of CHF for each vertical position 100 mm and 400 mm at outer pipe are 380 kW/m2 and 733 kW/m2, and then at the heated rod are 250 kW/m2 and 497 kW/m2. Received: 20 November 2010; Revised: 25 July 2011; Accepted: 08 August 2011

Impact of Stakeholder Psychological Empowerment on Project Success

IPTEK The Journal for Technology and Science Vol 22, No 2 (2011)
Publisher : Institut Teknologi Sepuluh Nopember

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Abstract

The relationship between psychological empowerment of stakeholders and project success is an important thing that must be known by project manager. This research developed and tested the model to predict how well the impact of stakeholder psychological empowerment on project success. Stakeholder psychological empowerment was defined to have five indicator variables covering intrinsic motivation, opportunity to perform, ability to perform, task behaviors, and contextual behaviors. Meanwhile, project success can be measured by cost performance, time performance, quality performance, profitability, and customer satisfaction. In this study, it was hypothesized that stakeholder psychological empowerment influenced project success. Based on the data obtained from a questionnaire survey carried out to 204 respondents, structural equation modeling (SEM) was used for predicting the performance of project success. It was found that stakeholder psychological empowerment influenced project success, especially on the ability to perform of stakeholders.

Study on The Physical Characteristics and Hydrology of 15 Watershed in East Java

Forum Geografi Vol 27, No 2 (2013): December 2013
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

The study demonstrated the application of statistical method to describe physical and hydro-meteorological characteristics by means of time series analysis.  Fifteen(15) watersheds in East Java were selected for this study. Data input for the analysis include: physical data, rainfall and discharge. Physical data of the watershed (topography, river network, land use, and soil type) are extracted from existing database and treated using GIS Software. Daily rainfall data were collected from existing pluviometers around the region. Daily discharge data were obtained from measurement station located at the outlet of each watershed. Areal Rainfall for each watershed was determined using average value of existing pluviometers around the watershed and determined using simple arithmetic method. These time series data are then imported to RAP (River Analysis Package).  Analysis on the RAP, include: general statistical, flow duration curve (FDC), and baseflow analysis. The result then presented in graphic and tables. Research shows that among the watersheds have different physical and hydrological characteristics.

Analysis of Rewetting Time and Temperature Distributions During Cooling Process in Vertical Rectangular Narrow

Jurnal Energi Dan Manufaktur Vol 6, No 2 (2013): Oktober 2013
Publisher : Jurnal Energi Dan Manufaktur

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Abstract

AbstractCooling process to analyze effect of gap size to rewetting time and temperature distributionswere studied from transient temperature of surface plate. It as result of experiment using twovertical plate with the initial temperature about 600°C. Debit and temperature of cooling waterare 0,09 L/s and saturated temperature. The gap sizes were changed from 1 mm, 2 mm, and 3mm. As the results showed that the smaller the gap size, the longer the rewetting time. Patternof temperature distribution is similar at initial condition for all of gap sizes and the smaller thegap sizes, the longer the time of decreasing temperature.Keywords: Cooling process, rewetting time, temperature distribution.AbstrakProses pendinginan untuk menganalisa pengaruh ukuran celah terhadap waktu pembasahandan distribusi temperatur diamati dari transient temperatur permukaan plat. Penelitiandilakukan menggunakan dua plat vertikal dengan temperatur awal 6000C. Debit dan temperaturair pendingin adalah 0,09 L/s dan temperatur jenuh. Ukuran celah divariasikan dari 1 mm, 2mm dan 3 mm. Hasil penelitian menunjukkan bahwa semakin kecil ukuran celah semakinpanjang waktu rewetting. Pola distribusi temperaursama pada kondisi awal untuk semuaukuran celah, semakin kecil ukuran celah semakin panjang waktu untuk penurunantemperatur.Kata kunci: Proses pendinginan, rewetting time, distribusi temperatur

PERILAKU PEKERJA SEKS KOMERSIAL TERHADAP PENCEGAHAN PENYAKIT MENULAR SEKSUAL DI LOKALISASI KALINYAMAT BANDUNGAN

JURNAL KEBIDANAN DAN KESEHATAN TRADISIONAL Vol 1, No 1 (2016): JURNAL KEBIDANAN DAN KESEHATAN TRADISIONAL
Publisher : JURNAL KEBIDANAN DAN KESEHATAN TRADISIONAL

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Abstract

Abstract: Behavior, Commercial sex workers, Sexually transmitted diseases. This study aims to reveal the phenomenon of Conduct Against Commercial Sex Workers Sexually Transmitted Disease Prevention at Localization Kalinyamat, Bandungan. This study used a qualitative design with sample collection technique is purposive sampling with maximum sampling type of sampling variation. The collection of data by using a technique Focus Group Discussion (FGD) and In-depth Interviews (WM). In this study, researchers used informants DKT 6 and 8 informants WM. Test the validity of the data was done by using triangulation. The results showed that the behavior of prostitutes on the prevention of STDs seen from most of the knowledge already know about the definition, causes, types, signs and symptoms of STD prevention, of attitudes that are divided into several categories there who agree and disagree, on the activities on the prevention largely meet health standards.

Co-Authors Adhinurwanto, Dicky Afisna, Lathifa Putri Agung Priyo Subakti Agus Kirwanto Ahmad Yusron, Ahmad Akhmad Zidni Hudaya Alva Edy Tontowi Anggita Gigih Wahyu Iriawan, Anggita Gigih Wahyu Aprih Santoso, Aprih Ardian Nur Fakrudin Arif Faisol Ash-Shiddiq, Dimas Ghufron Askin, Askin Askin, Askin Askin, M. Boedi Susanto Budi Santoso Catrawedarma, I Gusti Ngurah Bagus Deendarlianto Deendarlianto Dewi Puspitasari Djoko Santoso Dwi Aries Himawanto Elida Novita Ernanda, Heru Hamid Ahmad Harwin Saptoadi Herry Pintardi Chandra Hidayah, Pradita Dewi Hidayat, M. Dian Nurul I Putu Artama Wiguna Idah Andriyani IGN. Bagus Catrawedarma Ika Kartika Kaliwantoro, Nur Khasani Khasani M. Juarsa Mahmuddin Mahmuddin Mardyasari, Lucia Hartiningtyas Marsetyawan HNE Soesatyo Mohammad Juffrie, Mohammad Muhardjo Pudjojono, Muhardjo Mulya Juarsa Mustakim Mustakim N. Putra Ninin Ismulayati, Ninin Nugroho, Fellando Martino Nurfalitasari, Iftika Okto Dinaryanto Peter F Kaming Prabowo, Oxy Mahendra Pradusuara, Franes Pudjojono, Muharyo Purnomo Purnomo Putri Ratnasari R. DHIMAS DHEWANGGA P, R. DHIMAS RA. Koestoer Rini Dharmastiti S. Habsari Samsul Kamal Sarwoasih, Sri Sri Wahyuningsih Sriatun Sriatun Suhardjo Widodo Sukamta Sukamta Sukmana, Damar Tedja Suprihatin Suprihatin Tasliman, Tasliman Thomas S. W. Tino Bachtiar, Tino Tri Agung Rohmat Tri Agung Rokhmat, Tri Agung Tris Lailatul Hasanah, Tris Lailatul Triwik Sri Mulati Triyono, David Wibawa Endra Juwana, Wibawa Endra Widowati, Sri Yuni Wiratni Wiratni, Wiratni