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THE EFFECT OF PH AND CALCINATION TEMPERATURE ON THE ZrO2 PHASE FORMATION FROM NATURAL ZIRCON SAND OF KERENG PANGI Abdullah, Mohammad; Triwikantoro, Triwikantoro; Umamah, Chairatul; Andi, Herman Jufri
Jurnal Neutrino Vol 13, No 2 (2021): APRIL
Publisher : Department of Physics, Maulana Malik Ibrahim State Islamic University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18860/neu.v13i2.10507

In this research ZrO2 has been synthesized from Kereng Pangi zircon sand in Central Kalimantan through alkali fusion-coprecipitation method. Firstly, zircon sand (ZrSiO4) was purified to reduce impurities by magnetic separation, cleaned using an ultrasonic cleaner, soaked/leached with HCl 2 M for 12 hours and leached with HCl at 60 ÂºC for 3 hours. Secondly, alkali fusion was done with KOH as an alkali. This product was then washed by water and dried before leached with HCl 30% at 90 ÂºC for 30 minutes to precipitate and seperate Silica from Zircon. ZrO2 filtrate (ZrOCl2) precipitated with NH4OH at pH 4, pH 7, and pH 10 forms Zr(OH)4 gel. Zr(OH)4 gel was dried and characterized by DTA-TGA, which was then followed by calcination based on DTA TGA results at temperature ranges of 550 ÂºC - 700 ÂºC to produce ZrO2. XRD results show that single tetragonal phase of ZrO2 is formed in all variations of pH precipitation and calcination temperature. An analysis using MAUD software show that crystal size reduces as the increase in precipitation of pH. The crystal size results are 110 nm, 66 nm and 48 nm at pH 4, pH 7 dan pH 10 at 700 ÂºC, respectively. Moreover, XRF results show that ZrO2Â with purity is at around 95.8 % at pH 4 and 96.3 % at pH 7 and pH 10.

Pengaruh Komposisi Katalis pada Pembuatan Komposit Sebagai Aplikasi untuk Body Kontes Mobil Hemat Energi (KMHE) Hamid, Abdul; Ali Zainal Abidin, Muhammad; Annafiyah, Annafiyah; Dayi Febriana, Ike; Miftahatul Ilmah, Aurista; Abdullah, Mohammad
Journal of Applied Mechanical Engineering and Renewable Energy Vol 4 No 2: August 2024
Publisher : Indonesian Society of Applied Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52158/jamere.v4i2.816

A strong and light body shape is an important factor in the Energy Saving Car Contest. The shape and material of the body used affects the speed of the car. Composite materials are often chosen as material for making Energy Saving Car Contest bodies, because they are strong, light and have a fiber structure that binds each other. So this research aims to determine the effect of variations in catalyst composition on composite materials using fiberglass, woven roving and resin to obtain optimum composite results. Variations in the composition of the catalyst used are 1; 1.5; 2 and 2.5 %. Based on the results of the tests that have been carried out, tensile test results were obtained with the highest results, namely for 2.5% catalyst composition variation of 72.23 MPa and the lowest value was 27.1 MPa for a 1% catalyst composition. The greater the catalyst composition causes the tensile strength value to increase. The highest max force and modulus of elasticity test results were obtained with a 2% variation in catalyst composition, namely 7217 MPa and 16.30 MPa. Meanwhile, the highest impact test results obtained were 10.65 Joules with a catalyst variation of 1.5%..

EVOLUTION IN WAQF JURISPRUDENCE AND ISLAMIC FINANCIAL INNOVATION Abdullah, Mohammad
Journal of Islamic Monetary Economics and Finance Vol 4 No 1 (2018)
Publisher : Bank Indonesia

This paper aims to analyse the evolutionary process in the jurisprudential structure of modern waqf (Islamic endowment) and underlines the scope of Islamic financial innovation through the mechanism of waqf. The paper proposes the innovative models of parallel waqf, waqf-based social and financial instruments, waqf-based ṣukūk, micro-takāful, and waqf-based commodity bank. The research adopts the qualitative approach and employs socio-legal research methodology for the analysis. The paper relies on desk-based research. Compared to the classical structure of waqf which was confined within the domain of a perpetual charitable institution, this paper finds that modern waqf has ushered in several new dimensions into its fold. Modern waqf is in the process of re-evolution. Waqf, in the current scenario, has evolved into a financial product, a property-conveyance tool, an instrument of contract, an investment tool, a risk mitigation mechanism and an incorporated entity. The scope of this paper is limited to analysing the jurisprudential evolution of waqf and its impact on the Islamic finance industry. It does not seek to discuss the overall role or impact of waqf on the society as a whole. This paper also does not endeavor to compare and contrast the mechanism and modalities of other philanthropic institutions vis-ā-vis waqf. This paper examines the jurisprudential underpinnings of waqf and their implications and applicability to the Islamic finance industry. The paper draws on the process of how the mechanism of waqf has already been employed to develop various innovative Islamic financial products and how this process can be a catalyst for further innovation in the Islamic finance industry. The main contribution of the paper is encapsulated in the analysis of how the jurisprudential structure of the modern waqf has been evolving in the last few decades to accommodate the modern needs of Islamic finance. It further enumerates a few innovative Islamic financial products which can be developed by exploiting the available flexibility in the evolved version of modern waqf.

STUDI KOMPARATIF HADIS-HADIS TENTANG JUMLAH RAKAAT SALAT SUNAH RAWATIB MUAKKAD MENURUT IMAM AL-BUKHARI DAN IMAM MUSLIM Abdullah, Mohammad
Al-Mazaahib: Jurnal Perbandingan Hukum Vol. 8 No. 2 (2020): Al-Mazaahib
Publisher : UIN Sunan Kalijaga Yogyakarta

Dalam praktik masyarakat umat Islam, salat sunah rawatib sangat tidak asing didengar dikarenakan begitu banyak manfaat yang didapatkan juga amal ibadah untuk melengkapi kekurangan dari amal-amal ibadah yang wajib. Dalam salat sunah rawatib sendiri terbagi menjadi dua yakni muakkad dan ghairu muakkad, namun dalam salat sunah rawatib muakkad terdapat perbedaan pendapat dalam hal jumlah rakaat. pendapat pro kontra terjadi antara ulama masalah kedua hadis yang bertentangan tentang jumlah rakaat yang dikemukakan oleh Imam al-Bukhari dan Imam Muslim. Menurut Imam al-Bukhari dalam hadisnya menyebutkan bahwa jumlah rakaatnya adalah 10 rakaat, berbeda dengan Imam Muslim yang menyebutkan 12 rakaat. Terdapat nuansa perbedaan atau pertentangan dalam kedua hadis tersebut, yang mana kedua hadis sama-sama kuat dan bersumber dari Rasulullah Saw. Maka pembahasan dalam tulisan ini menjelaskan hukum melaksanakannya salat rawatib muakkad. Dalam menyelesaikan permasalahan tersebut terdapat dua keilmuan. Dalam ilmu usul fiqh, pertentangan tersebut dikenal dengan istilah ta’arudh al-Adillah sedangkan dalam ilmu kaidah fiqhiyyah ulama biasa menggunakan kaidah fiqhiyah al-I’malu Khoiru Min al-Ihmali. Adapun penyelesaiannya menggunakan al-Jam’u wa al-Taufiq atau menggumpulkan dan menggabungkan kedua dalil dan juga Tarjih atau memilih salah satu diantara kedua hadis tersebut.

PENGEMBANGAN MESIN DOWEL 3 IN 1 PEMBUAT PASAK KAYU UNTUK PEMBANGUNAN PERAHU NELAYAN DI WILAYAH PESISIR MADURA Iswidodo, Windra; Fikri, Mohammad Anas; Permata, Tristiandinda; Abdullah, Mohammad
Injection: Indonesian Journal of Vocational Mechanical Engineering Vol 2 No 2 (2022)
Publisher : Pengelola Jurnal Politeknik Negeri Ketapang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58466/injection.v2i2.1481

The coastal area of Madura has many fishing boats or fishing vessels of various types and sizes. The construction of traditional ships is carried out by groups of workers or traditional shipyards which are not permanent, technological readiness is still minimal, and the workforce is very limited. Especially in traditional shipyards in the coastal area of Madura or throughout Indonesia's coastal areas, which still rely on skills from generation to generation, so it is difficult to achieve the ship size desired by the customer, even the deviation of the size in tons can reach 25 percent. This situation shows the weakness of the technology applied in the traditional shipbuilding industry. Therefore, the technology of dowel making machine for making wooden dowels is carried out 3 in 1 with the function of shaving wood, cutting wood as desired and sharpening pegs or wood. All work is done in one machine which can be done automatically by setting the desired peg size and running with a microcontroller system. Tests have been carried out on a 3 in 1 dowel machine using 2 motors, the average time is equal to or more than 1 minute/1 piece of peg. Testing the tool using 1 motor obtained an average time of less than 30 seconds to produce 1 wooden peg.

Water Quality Model in Jambi Province using Geographically Weighted Regression Yuinanda, Sherli; Multahadah, Cut; Marisa, Hasnaul; Abdullah, Mohammad
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 24 No. 03 (2023): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol23-iss03/378

PDAM (Regional Water Supply Company) functions to serve the needs of many people's lives by providing quality water for the community. Based on Permenkes no. 492/menkes/per/iv/2010 clean water quality parameters, namely the feasibility of water used in daily life related to physical, chemical and microbiological parameters including Biological Oxygen Demand (BOD), Total Dissolved Solid (TDS), Cloride (Cl), and Nitrates (NO3). The aim of this research is to test the water quality of PDAMs in Jambi Province based on minimum quality standards for clean water Using Geographically Weighted Regression (GWR) with the assumption. The method can be used to model the relationship between the dependent variable and the independent variable has regional influence. The results showed that the BOD values of all regions in Jambi province met except for Merangin, which was 2.1 mg/l with a threshold value of 2.0 mg/l. For other parameters, namely TDS, Cl and NO3, they meet the threshold values. Based on the results of the GWR model, the coefficient ofÂ is 0.669 , this means that there is a relationship between TDS, Cl and NO3 to BOD and is positive.

EVOLUTION IN WAQF JURISPRUDENCE AND ISLAMIC FINANCIAL INNOVATION Abdullah, Mohammad
Journal of Islamic Monetary Economics and Finance Vol. 4 No. 1 (2018)
Publisher : Bank Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21098/jimf.v4i1.920

This paper aims to analyse the evolutionary process in the jurisprudential structure of modern waqf (Islamic endowment) and underlines the scope of Islamic financial innovation through the mechanism of waqf. The paper proposes the innovative models of parallel waqf, waqf-based social and financial instruments, waqf-based ṣukūk, micro-takāful, and waqf-based commodity bank. The research adopts the qualitative approach and employs socio-legal research methodology for the analysis. The paper relies on desk-based research. Compared to the classical structure of waqf which was confined within the domain of a perpetual charitable institution, this paper finds that modern waqf has ushered in several new dimensions into its fold. Modern waqf is in the process of re-evolution. Waqf, in the current scenario, has evolved into a financial product, a property-conveyance tool, an instrument of contract, an investment tool, a risk mitigation mechanism and an incorporated entity. The scope of this paper is limited to analysing the jurisprudential evolution of waqf and its impact on the Islamic finance industry. It does not seek to discuss the overall role or impact of waqf on the society as a whole. This paper also does not endeavor to compare and contrast the mechanism and modalities of other philanthropic institutions vis-ā-vis waqf. This paper examines the jurisprudential underpinnings of waqf and their implications and applicability to the Islamic finance industry. The paper draws on the process of how the mechanism of waqf has already been employed to develop various innovative Islamic financial products and how this process can be a catalyst for further innovation in the Islamic finance industry. The main contribution of the paper is encapsulated in the analysis of how the jurisprudential structure of the modern waqf has been evolving in the last few decades to accommodate the modern needs of Islamic finance. It further enumerates a few innovative Islamic financial products which can be developed by exploiting the available flexibility in the evolved version of modern waqf.

Perancangan Sistem Pompa dan Perpipaan pada Sistem Seawater Reverse Osmosis Maulidi, Akh.; Santoso, A.D; Irmiyana, Triyanti; Abdullah, Mohammad; Maulina, Iqlima; Faudya, A.B
Techno Bahari Vol 12 No 1 (2025): Maret
Publisher : Politeknik Negeri Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52234/tb.v12i1.395

Politeknik Negeri Madura (POLTERA) yang terletak di Kabupaten Sampang, Jawa Timur, berdiri sejak tahun 2012. Letaknya yang berada diluar kota Sampang dan berada tepat di pesisir pantai, maka sumber mata air tanah di POLTERA adalah payau. Sedangkan saluran air dari PDAM belum menjangkau sampai ke daerah pesisir, sehingga selama ini POLTERA dalam memenuhi kebutuhan air bernya dengan cara membeli air bersih 3 tangki dalam sehari. Sementara pemenuhan air ini tidak untuk memenuhi kebutuhan consumable. Dalam penelitian ini, akan melakukan analisa kebutuhan air bersih di POLTERA setiap harinya, danmerancang pompa dan pipeline alat sea water reverse osmosis (SWRO). Luaran penelitian ini berupa perencanaan pompa dan piping lines SWRO berbasis studi kasus di kampus POLTERA. Hasil penelitian ini diketahui kebutuhan air bersih di POLTERA setiap harinya sebesar 170,33 m3. Sistem pompa dan perpipaan pada SWRO bekerja dengan mengalirkan air payau dari sumur ke tangki pretreatment, kemudian disaring bertahap melalui sediment filter 5 mikron, sediment 1 mikron, dan Granular Active Carbon (GAC) untuk membuang partikel dan zat berbahaya, serta dipompa dengan tekanan 10–15 bar agar sesuai syarat proses RO. Selanjutnya air masuk ke membran RO untuk menghasilkan air tawar yang ditampung di storage tank, lalu melewati post carbon filter agar bau dan rasa lebih baik sebelum akhirnya siap dikonsumsi.Kata Kunci: Pompa ; Skema Perpipaan ; SWRO ; Tangki.

Optimization of Biodiesel Production from Sunflower Oil Using Sodalite-Based Catalyst via Taguchi Method Hamid, Abdul; Jakfar, Amin; Rahmawati, Zeni; Armansyah, Muhammad Doni; Wahyuni, Tri; Purbaningtias, Tri Esti; Febriana, Ike Dayi; Abdullah, Mohammad; Ilmah, Aurista Miftahatul; Rohmah, Faizatur
Jurnal Teknik Kimia dan Lingkungan Vol. 9 No. 2 (2025): October 2025
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v9i2.7345

The growing demand for alternative fuels has highlighted biodiesel as sustainable substitute for fossil diesel. In this study, biodiesel was produced from sunflower seed oil using heterogeneous catalyst synthesized from natural kaolin into sodalite via hydrothermal process. The synthesized catalyst was characterized using XRD, FTIR and SEM-EDS, confirming the transformation of kaolinite to sodalite. The transesterification reaction was conducted under varying methanol-to-oil molar ratios (1:12, 1:18, and 1:24) and temperatures (60, 65, and 70°C). A Taguchi orthogonal array (L9) was employed to statistically evaluate the effects of these parameters on methyl ester yield. Experimental results showed that both methanol ratio and reaction temperature significantly influenced biodiesel yield, with the highest yield of 90.44% obtained at 70°C and 1:18 molar ratio. Signal-to-noise ratio and ANOVA analysis indicated that the methanol-to-oil ratio was the most dominant factor (46.05%) compared to temperature (40.55%). The resulting biodiesel exhibited a flash point of 158°C, acid value of 0.06 mg-KOH/g, and iodine value of 84.06 g-I₂/100g, satisfying most ASTM D6751 and SNI 7182:2015 standards, though viscosity and density exceeded standard limits. Emission testing showed 16% reduction in CO emissions with increasing biodiesel blends, while NO and NOx emissions slightly increased.

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