Articles

KECENDERUNGAN DAN PERUBAHAN HUJAN EKSTREM HARIAN DI PULAU MADURA Fura, Ahmad Nur Akma Juangga; Wiyono, Retno Utami Agung; Indarto, Indarto
Jurnal Ilmu Lingkungan Vol 18, No 1 (2020): April 2020
Publisher : Program Studi Ilmu Lingkungan,Program Pascasarjana, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jil.18.1.89-96

Abstract

Madura is prone to high level of flood hazard. One of the main causes of floods is the extreme rainfall. Global warming allows changes in the amount of extreme rainfall. This research was conducted to identify and analyze trends, changes, and randomness of the maximum period of 24-hour extreme rainfall data on Madura Island. The method used was a non-parametric method which includes the Median Crossing test, the Mann-Kendall test, and the Rank-Sum test at the significance level of ? =0.05. There were 31 rain gauge stations that were selected out of 66 rain gauge stations which has 20 consecutive years period rainfall data. The period of rainfall observation data was between 1991-2015. The highest extreme daily rainfall data was observed at Ketapang station (430 mm) while the lowest extreme daily rainfall data was observed at Saronggi Station (25 mm). It was found that the west side of  Madura Island and the mountain area show higher value of extreme daily rainfall than other area. High intensity of rainfall (> 100 mm) was occurred in Arosbaya, Ketapang and Ambunten stations while other three stations showed lower intensity of rainfall (Tragah, Larangan and Saronggi). The results of the analysis showed that based on the Median Crossing test, most rain stations have data originating from random processes. A small part of the rain stations was analyzed based on the Mann-Kendal test and the Rank-Sum test. The result showed that the maximum 24-hour extreme rain trend was significantly decreased in a few locations  (Kamal, Ketapang, dan Ganding), while most stations (26 stations) have no experience a significant trend.
The Visualization Study on the Slug Flow Mechanisms of the Air-Water Two-Phase in a 50 mm Horizontal Pipe Dinaryanto, Okto; Hudaya, Akhmad Zidni; Deendarlianto, Deendarlianto; Indarto, Indarto
SENATIK STT Adisutjipto Vol 4 (2018): Transformasi Teknologi untuk Mendukung Ketahanan Nasional [ ISBN 978-602-52742-0-6 ]
Publisher : Sekolah Tinggi Teknologi Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (560.273 KB) | DOI: 10.28989/senatik.v4i0.171

Abstract

The slug flow phenomena are often encountered in various industrial applications such as petroleum, process, and power plant. The presence of slug flow should be avoided as it causes structural damage due to resonance, corrosion and pipes blast. From the view point of multiphase flow, the understanding of the slug initiation mechanism is very important in pipeline design. This research is conducted using horizontal transparent acrylic pipes with diameters of 50 mm with a variation on the superficial velocity of water between 0,1 m/s and 0,77 m/s and superficial velocity of air between 0,31 m/s and 6,2 m/s. In the present experimental study, the slug initiation mechanisms was explained by visual observation by using high speed video cameras. As the results, the slug flow initiation mechanism were clarified. Furthermore, the proposed of flow initiation map was introduced.
PEMISAHAN ALIRAN KEROSEN-AIR (PADA VARIASI SUDUT KEMIRINGAN SIDE ARM VERTIKAL KEATAS) Puspitasari, Dewi; Indarto, Indarto; Purnomo, Purnomo; Khasani, Khasani
ROTASI VOLUME 14, NOMOR 2, APRIL 2012
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1340.945 KB) | DOI: 10.14710/rotasi.14.2.11-16

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 ? = 95%. Kondisi terbaik diatas diperoleh pada Jw = 0,20 m/s, Jk = 0,22 m/s pada pola aliran Three Layer (3L-2).
MENINGKATKAN KINERJA PEGAWAI NEGERI SIPIL (PNS) MELALUI PENGELOLAAN KECERDASAN DAN SIKAP ETIS Adhinurwanto, Dicky; Indarto, Indarto
Jurnal Riset Ekonomi dan Bisnis Vol 10, No 2 (2017): Agustus 2017
Publisher : Pascasarjana Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/jreb.v10i2.1135

Abstract

Faktual problem yang saat ini sedang dihadapi oleh PNS adalah sorotan negatif akibat kemerosotan mental dan moral yang ditunjukkan dalam melaksanakan tugas pelayanan, mengemukanya praktek KKN (Kolusi, Korupsi dan Nepotisme), menguaknya issue amoral yang telah melibatkan penyelenggara negara, juga terungkap perilaku kekerasan dalam rumah tangga yang dilakukan oleh anggota PNS adalah fakta yang tidak dapat dipungkiri. Mengacu pada temuan faktual problem yang ada maka masalah penelitian yang dirumuskan adalah “Bagaimana meningkatkan sikap etis dan kinerja PNS di lingkungan kantor Setda Provinsi Jawa Tengah?”.Dengan menggunakan data yang diperoleh melalui kuesioner yang disebarkan kepada responden pegawai Biro Umum di Kantor Setda Provinsi Jawa Tengah, penelitian ini menguji pengaruh kecerdasan emosional, kecerdasan intelektual, dan kecerdasan spiritual terhadap sikap etis dan kinerja. Pengujian pengaruh antar variabel dilakukan dengan menggunakan Uji Regresi Berganda.Hasil pengujian regresi berganda menunjukkan bahwa kecerdasan emosional, kecerdasan intelektual, dan kecerdasan spiritual terbukti berpengaruh positif signifikan terhadap sikap etis. Hasil penelitian ini juga menunjukkan bahwa kecerdasan emosional, kecerdasan intelektual, kecerdasan spiritual serta sikap etis terbukti memiliki pengaruh signifikan terhadap kinerja pegawai. Factual problems currently being faced by civil servants is negative spotlight due to mental deterioration and moral demonstrated in carrying out the ministry, collusion, corruption and nepotism, to reveal issue amoral that has involved state officials, also revealed violent behavior in the home the stairs were made by members of civil servants is a fact that can not be denied. Referring to the factual findings of the problems formulated the research problem is "How to improve ethical attitudes and performance of civil servants in the Central Java Provincial Secretariat office?".By using the data obtained through a questionnaire distributed to respondents employee in the Office of General Bureau Secretariat of Central Java province, this study examines the effect of emotional intelligence, intellectual, and spiritual intelligence of the ethical attitude and performance. Testing the influence between variables is done by using multiple regression test.The test results of multiple regression showed that emotional intelligence, intellectual, and spiritual intelligence proved significant positive effect on the ethical attitudes. The results also indicate that emotional intelligence, intellectual, spiritual intelligence and ethical attitude shown to have a significant influence on employee performance.
ANALISIS PENGARUH PROFITABILITAS LIKUIDITAS DAN PERTUMBUHAN PERUSAHAAN TERHADAP KEBIJAKAN UTANG SERTA DAMPAKNYA TERHADAP TARIF PAJAK EFEKTIF Sarwoasih, Sri; Indarto, Indarto
Jurnal Riset Ekonomi dan Bisnis Vol 11, No 1 (2018): April 2018
Publisher : Pascasarjana Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/jreb.v11i1.1075

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh profitabilitas yang diproksikan dengan return on asset, pengaruh likuiditas yang diproksikan dengan current ratio serta pengaruh pertumbuhan perusahaan yang diproksikan dengan asset growth dan sales growth terhadap effective tax rate dengan debt to equity ratio sebagai variable intervening dan untuk mengetahui pengaruh return on asset dan sales growth secara langsung terhadap effective tax rate. Jenis data yang digunakan berupa data kuantitatif dengan metode purposive sampling, sampel penelitian adalah perusahaan manufaktur yang terdaftar di Bursa Efek Indonesia tahun 2014–2016 sejumlah 108 sampel. Hasil uji hipotesis menyatakan return on asset dan current ratio berpengaruh signifikan terhadap debt to equity ratio, asset growth dan sales growth tidak berpengaruh signifikan terhadap debt to equity ratio, debt to equity ratio, return on asset,  dan  sales growth berpengaruh signifikan terhadap effective tax rate. Hasil sobel test model 1 : debt to equity ratio berhasil memediasi return on asset dan effective tax rate, Model 2 : debt to equity ratio tidak berhasil memediasi sales growth dan effective tax rate.This research aims to determine the effect of profitability proxies by return on assets, the influence of liquidity proxies by current ratio and the influence of the company’s growth proxies by asset growth and sales growth to the effective tax rate to the debt to equity ratio as intervening variable and to know the effect of return on asset and sales growth directly to effective tax rate. The types of data used in the form of quantitative data with using purposive sampling method, the sample research is a manufacturing company listed on the Indonesia Stock Exchange in 2014-2016 with number of samples are 108.             Hypothesis test result : return on asset and current ratio has significant effect to debt to equity ratio, asset growth and sales growth has not significant effect on debt to equity ratio, debt to equity ratio, return on asset and sales growth has a significant effect on effective tax rate. The results of the sobel test model 1: debt to equity ratio succeed in mediating return on assets and effective tax rate, Model 2: debt to equity ratio did not succeed in mediating sales growth and effective tax rate.
POLA PENINGKATAN KINERJA BISNIS UKM MELALUI MODAL SOSIAL DAN MODAL MANUSIA DENGAN KEBIJAKAN PEMERINTAH SEBAGAI MODERATING Santoso, Djoko; Indarto, Indarto; Sadewisasi, Wyati
Jurnal Dinamika Sosial Budaya Vol 21, No 2 (2019): Desember
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/jdsb.v21i2.1764

Abstract

Penelitian ini untuk menjawabbagaimana meningkatkan kinerja bisnis UKM handy crab kota Semarangmelalui modal social dan modal manusia dengan moderating kebijakan pemerintah.Populasi penelitian adalah para pengusaha UKM handy krab di kota Semarang. Dengan sampel 79 pengusaha yang tersebar di kota Semarang.. Analisis Moderating Regration dengan menggunakan moderating variable kebijakan pemerintah sebagai variable independen yang akan memperkuat atau memperlemah pengaruh antara modal social dan modal manusia  terhadap kinerja bisnis UKM handy crab.Hasil penelitian menunjukkan bahwa modal social dan modal manusia berpengaruh positif dan signifikan dengan kinerja bisnis UKM handy crab. Kebijakan pemerintah mampu moderasi terhadap pengaruh modal social dan modal manusia terhadap kinerja bisnis UKM handy crab kota Semarang.
Study on The Physical Characteristics and Hydrology of 15 Watershed in East Java Indarto, Indarto
Forum Geografi Vol 27, No 2 (2013): December 2013
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v27i2.2374

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.
PERAN TEAMWORK DAN TIME PRESSURE TERHADAP KINERJA DENGAN AFFECTIVE COMMITMENT SEBAGAI VARIABEL INTERVENING Auromiqo, Candra; Indarto, Indarto; Santoso, Djoko
Jurnal Riset Ekonomi dan Bisnis Vol 12, No 3 (2019): DESEMBER
Publisher : Pascasarjana Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/jreb.v12i3.1799

Abstract

Tujuan penelitian untuk mengetahui pengaruh teamwork dan time pressure terhadap affective commitment yang berdampak pada kinerja auditor BPK Perwakilan Provinsi Jawa Tengah. Variabel yang digunakan adalah teamwork dan time pressure sebagai variabel independen, kinerja sebagai variabel dependen serta affective commitment sebagai variabel intervening. Sampel yang digunakan adalah auditor BPK Perwakilan Provinsi Jawa Tengah yang berjumlah 100 responden, pengambilan sampel menggunakan purposive sampling. Metode pengumpulan data yang digunakan adalah kuesioner (angket). Pengolahan data menggunakan PLS. Analisis yang digunakan meliputi outer model, uji validitas, uji reliabilitas, inner model, dan uji hipotesis. Berdasarkan hasil analisis dapat diketahui bahwa teamwork dan time pressure berpengaruh terhadap affective commitment, time pressure berpengaruh terhadap kinerja tetapi teamwork tidak berpengaruh terhadap kinerja, dan affective commitment bukan sebagai variabel intervening hubungan antara variabel teamwork dan time pressure terhadap kinerja auditor BPK Perwakilan Provinsi Jawa Tengah.The aim of the study was to determine the effect of teamwork and time pressure on affective commitment which had an impact on the performance of the auditors in BPK Representative Office of Central Java. Variables used are teamwork and time pressure as independent variables, performance as dependent variable and affective commitment as intervening variables. The sample used was the auditor in BPK Representative Office of Central Java, amounting to 100 respondents, sampling using purposive sampling. Data collection method used is questionnaire. The analysis used includes outer model, validity test, reliability test, inner model, and hypothesis test. Based on the results of the analysis it can be seen that teamwork and time pressure have an influence on affective commitment, time pressure have an influence on performance but teamwork has no effect on their performance, and affective commitment is not an intervening variable of the relationship between teamwork and time pressure variable on the performance of the BPK Representative Office of Central Java Auditors.
APLIKASI METODE AMBANG BERTINGKAT UNTUK ANALISIS POTENSI BANJIR: STUDI PENDAHULUAN PADA 15 DAS DI JAWA TIMUR Indarto, Indarto; Wahyuningsih, Sri; Pudjojono, Muhardjo; Ahmad, Hamid; Bachtiar, Tino
JURNAL AGROTEKNOLOGI Vol 9 No 01 (2015)
Publisher : Faculty of Agricultural Technology, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (791.758 KB)

Abstract

This research deals with identification of potential flood discharge from 15 watersheds located in Eastern Part of East Java Province. Recorded times series of daily discharges data are used as main input for the analysis. The discharge data for each watershed are rangked from lowest to high value. Then, the value of discharge correspond to quantile 90% (Q90) is calculated and determined as the threshold level for each watershed. In this case, discharge data more than > Q90 value is categorized as flood events. Then, the frequency of flood events are calculated based on monthly or annual time interval. Furthermore, spatial distribution of flood events are visualized by comparing the frekuency of flood events amongs the watersheds. Finally, thematics maps corresponde to waterheds properties, frequency of flood events, and rainfall event are presented.Keywords: Threslod level method, waterheds, flood indice, East Java
OPTIMASI PENGGUNAAN KOAGULAN ALAMI BIJI KELOR (MORINGA OLEIFERA) PADA PENGOLAHAN LIMBAH CAIR MOCAF Novita, Elida; Indarto, Indarto; Hasanah, Tris Lailatul
JURNAL AGROTEKNOLOGI Vol 8 No 02 (2014)
Publisher : Faculty of Agricultural Technology, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (373.44 KB)

Abstract

The use of moringa plant seeds as a natural coagulant has economic value and environmental friendly. They also can be used to purify water, so that the seeds were able to decrease the pollution concentration of mocaf wastewater. The aim of this research was to study the ability of moringa seeds, as a natural coagulant to overcome mocaf wastewater pollution. The method was used coagulation-flocculation with coagulant dosage range of 650 mg/l untill 1050 mg/l. The variables observed were turbidity, TSS, TDS and COD. The results showed that the optimum coagulant dose and the optimum pH is 850 mg/l and pH 8 with 59,79% decreased levels of turbidity, 75,46% TSS reduction rate and 32,55% COD reduction rate level. However the TDS values after treatment was greater than the TDS value before. It can be conclude that the use of Moringa seed powder was effective sufficiently as a coagulant for mocaf wastewater.Keywords: kelor seeds, liquid waste mocaf, turbidity, TSS, TDS and COD
Co-Authors Adhinurwanto, Dicky Afina, Afina Afisna, Lathifa Putri Agung Priyo Subakti Agus Kirwanto Ahmad Yusron, Ahmad Ajeng Yuanitasari 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 Ash-Shiddiq, Dimas Ghufron Askin, Askin Askin, Askin Askin, M. Aulia Novitasari Auromiqo, Candra Bambang Sri Anggoro Boedi Susanto Budi Santoso Budiman, Rio Budiyono Budiyono Catrawedarma, I Gusti Ngurah Bagus Catrawedarma, IGN Bagus Deendarlianto Deendarlianto Dewi Puspitasari Djoko Santoso Elida Novita Entin Hidayah Ernanda, Heru Fauzi, Fiqy Fura, Ahmad Nur Akma Juangga Ginanjar, Muhammad Syukron Hamid Ahmad Herlambang Saputra Herlinda, Nur Defitri Hidayah, Pradita Dewi Hidayat, M. Dian Nurul Idah Andriyani IGN. Bagus Catrawedarma Ika Kartika Ismu Handoyo Kaliwantoro, Nur Khasani Khasani Kiswanta Kiswanta, Kiswanta Lestari, Riski Meirdiani Mahendrapati , Alexander Nawangseto Mahmuddin, M Malyan, Ahmad Bahri Joni Mandala, Marga Mardyasari, Lucia Hartiningtyas Marsetyawan HNE Soesatyo Mohammad Juffrie, Mohammad Muhardjo Pudjojono, Muhardjo Mulya Juarsa Mustakim Mustakim Narulita, Windy Ninin Ismulayati, Ninin Nugroho, Fellando Martino Nurfalitasari, Iftika Nurfalitasari, Iftika Okto Dinaryanto Prabowo, Oxy Mahendra Pradusuara, Franes Pudjojono, Muharyo Purnomo Purnomo Purnomo, P Rini Dharmastiti Rohman, Isfi roni Saddewisasi, Wyati Sadewisasi, Wyati Sahat, Afro Aransa Samsul Kamal Sarwoasih, Sri Setiawan, Erwan Bagus SETYOWATI, N. Sri Wahyuningsih Sriatun Sriatun Suhardjo Widodo Sukamta Sukamta Sukmana, Damar Tedja Sumarno Sumarno Sumarsono, Agus Supani, Ahyar Suprihatin Suprihatin Taslim, Rhoshandhayani Koesiyanto Tasliman, Tasliman Teguh Wibowo Thomas S. W. Tino Bachtiar, Tino Tri Agung Rohmat Tri Agung Rokhmat, Tri Agung Tris Lailatul Hasanah, Tris Lailatul Triyono, David Wardoyo, Paulus Wibawa Endra Juwana, Wibawa Endra Widowati, Sri Yuni Wiratni Wiratni, Wiratni Wiyono, Retno Utami Agung Yusuf Kurniawan