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PENGARUH PENGETAHUAN PETANI TENTANG MULTIFUNGSI LAHAN SAWAH TERHADAP KEINGINAN PETANI MEMPERTAHANKAN KEPEMILIKAN LAHAN SAWAH DI KORIDOR YOGYAKARTA-MAGELANG Iskandar, Yusuf; Sudrajat, Sudrajat
Jurnal Bumi Indonesia VOLUME 3, NOMOR 3, TAHUN 2014
Publisher : Fakultas Geografi UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (141.557 KB)

Abstract

Tujuan penelitian ini adalah mengetahui tingkat pengetahuan petani tentang multifungsi lahan sawah, mengetahui keinginan untuk mempertahankan kepemilikan lahan sawah, mengidentifikasi faktor – faktor yang memengaruhi pengetahuan petani dan keinginan petani mempertahankan lahan sawah serta mengetahui pengaruh pengetahuan petani terhadap keinginan mempertahankan kepemilikan lahan sawah. Metode dasar adalah survei. Pengambilan jumlah sampel dilakukan secara insidental. Analisis yang digunakan adalah analisis tabel frekuensi, analisis regresi ordinal, serta analisis regresi linear sederhana. Tingkat pengetahuan petani tentang multifungsi lahan sawah adalah sedang (51,8%). Tingkat keinginan mempertahankan kepemilikan lahan sawah adalah sedang (50%). Faktor-faktor yang memengaruhi tingkat pengetahuan petani adalah pendapatan, frekuensi mengikuti penyuluhan, pendidikan, alasan utama bertani, serta keikutsertaan dalam kelompok tani. Faktor-faktor yang memengaruhi keinginan mempertahankan lahan sawah adalah umur, pendidikan, jarak lahan sawah dari Kota Yogyakarta dan Kota Magelang, frekuensi mengikuti penyuluhan, serta keikutsertaan pada kelompok tani. Pengaruh pengetahuan petani tentang multifungsi lahan sawah terhadap keinginan mempertahankan kepemilikan lahan sawah adalah rendah (29.6%).
Lanthanum and Nickel Recovery from Spent Catalyst using Citric Acid: Quantitative Performance Assessment using Response Surface Method Petrus, Himawan Tri Bayu Murti; Wijaya, Ardyanto; Iskandar, Yusuf; Bratakusuma, Danu; Setiawan, Hendrik; Wiratni, Wiratni; Astuti, Widi
Metalurgi Vol 33, No 2 (2018): Metalurgi Vol. 33 No. 2 Agustus 2018
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (523.642 KB) | DOI: 10.14203/metalurgi.v33i2.437

Abstract

Heavy metals and Rare earth elements (REEs) are nowadays being used widely in many industries from electronics to petroleum industries as catalysts. However, their disposal caused serious problems to the environment. With the sharp growth in its usage, there is a better way to use and utilize valuable metals from secondary sources such as their disposal rather than using new raw materials. The aim of this work is to study the potential of citric acid as a leaching agent to extract lanthanum and nickel in various acid concentration and leaching temperature. The raw material used in this work is spent catalyst from Pertamina Refinery Unit VI, Balongan, Indonesia. The spent catalyst is decarbonized with a heat treatment at 725°C for 10 minutes before the leaching process. The leaching process used 0.1; 1; and 2 M of citric acid with a varied temperature of 30, 60, and 80°C. The lanthanum recovery was calculated by comparing the mass percentage of lanthanum before leaching process and after leaching process using Energy Dispersive X-Ray Spectroscopy (EDX). The results were analyzed by response surface methodology (RSM) and are proved to be a reliable method to depict and analyze the leaching characteristics. The molarity of the citric acid is the most significant independent variables used in the research for lanthanum recovery response. However, based on the Pareto analysis result there are no significant variables that affect the recovery of nickel. The second order polynomial fitting model is also proved to be compatible with the response of lanthanum recovery but is less compatible with nickel recovery.
THE EFFECT OF NON PERFORMING LOANS, OPERATING EXPENSE TO OPERATING INCOME, AND LOAN TO DEPOSIT RATIO ON STOCK RETURN AT CONVENTIONAL BANKS Iskandar, Yusuf
Jurnal Entrepreneur dan Entrepreneurship Vol 6, No 1 (2017)
Publisher : Universitas Ciputra

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Abstract

This research is conducted to determine the effect of NPL, BOPO, and LDR on Stock Return of private banks and government banks as conventional banks in Indonesia. This research uses multiple linear regression analysis with three predictors. The results show that NPL and LDR have no significant effect on Stock Return, while BOPO has significant effect on Stock Return.