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INDONESIA
Jurnal Matematika & Sains
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
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Articles 339 Documents
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Inklinasi Optimal Panel Surya Sumbu Tetap di Indonesia Priyatikanto, Rhorom
Jurnal Matematika dan Sains Vol 21 No 1 (2016)
Publisher : Institut Teknologi Bandung

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Indonesia possesses a significant potential solar energy. According to in-situ measurements, solar irradiation overwestern part of Indonesia is about 4.5 kWh/m2, while the higher value of ~5.1 kWh/m2 is obtained at the easternpart. Installation of fixed-axis solar panel oriented to certain optimum inclination becomes an effective way togather the solar energy. Optimum inclination angle for every location needs to be determined by considering thegeographical latitude, topography and local climate. In this work, the optimum inclination angle of fixed axis solarpanel is calculated by employing ESRA (European Solar Radiation Atlas) model that invokes cloud cover maps fromfive-years visual observation of MTSAT Himawari 6 and Himawari 7 from 2008 to 2012. Topographical map fromUSGS-EROS Data Center and Linke turbidity maps from SoDa (Solar Radiation Data) are used for the calculation.The result is optimum inclination map for Indonesia with medium resolution of 0.25º × 0.25º. The optimum valuesdo not only depend on the latitude of the location but also the variation of the weather, especially cloud cover overthe year. It is found that the optimum inclinations deviate from the latitude by small angle between -1º in the northeast parts of Indonesia and 2º in the south west regions. This pattern is in agreement with the spatial variation ofprecipitation in Indonesia as reported by researchers in the past.
Fabrikasi Transparant Conducting Film Berbahan Dasar Grafit pada Substrat Plastik dengan Proses Mekanik Rahman, Dui Yanto; Sustini, Euis; Abdullah, Mikrajuddin
Jurnal Matematika dan Sains Vol 22 No 1 (2017)
Publisher : Institut Teknologi Bandung

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Transparent Conducting Film (TCF) employing graphite powder as conducting material has been successfully fabricated by using extremely cheap and simple method.  This method doesn’t use heating and transfer process which is commonly used in fabrication of Transparent Conducting Film. Graphite powder was directly deposited on the surface of plastic using circle motion of tube shaped-metal which its surface was covered with thick tissue. The film thickness was varied to investigate the influence of it to the transmittance and resistance of the film. The transmittance and resistance measurement was carried out under UV-Vis electrometer and I-V El-Kahfi equipment assistance, and finally the transmittance of 60% and resistance of 24,4 kΩ was gained for one time of coating, While 9 times of coating produced 13% of transmittance and 773 Ω of resistance.
Sintesis Nanokomposit -Fe2O3/SiO2 dengan Metode Salt-Assisted Spray Pyrolysis untuk Menurunkan Viskositas Minyak Berat Anrokhi, Mohamad Samsul; Nuryadin, Bebeh Wahid; Abdullah, Mikrajuddin; Khairurrijal, Khairurrijal; Iskandar, Ferry
Jurnal Matematika dan Sains Vol 22 No 1 (2017)
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A α-Fe2O3/SiO2 nanocomposite as aquathermolisys catalyst material at heavy oil has been synthesized and optimized by using  Salt-Assisted Spray Pyrolysis method. The α-Fe2O3/SiO2 nanocomposite is obtained by thermal decomposition from the precursor.  The precursor is made of FeCl3, SiO2 and NaCl and water as a solvent. Concentration of FeCl3, SiO2, and NaCl are 1:1:5 in order. the composition of SiO2 in the composite is 0%, 25% and 50% of total mass, respectively. the droplets were transported to the furnace reactor using air as a carrier gas with a fixed flow rate at 5 liter/min and the furnace’s temperature is 800 °C in order to get the pyrolysis reaction. The resulted powder is then characterized by using XRD, SEM and Chatalytic aquathermolysis test. The result of XRD characterization shows that crystal peaks of α-Fe2O3 has been formed. SEM result shows nanocomposite morphology of α-Fe2O3/SiO2 with circle particle form with average particle diametre of α-Fe2O3, SiO2 25% and SiO2 50% of total mass are 765 nm, 850 nm, and 746 nm, respectively. Catalytic Aquathermolysis test showed catalyst α-Fe2O3/SiO2 50%  has catalytic properties better than catalytic properties of α-Fe2O3/SiO2 and α-Fe2O3/SiO2 25%.
Pembuatan Material Komposit Polietilen dengan Bahan Pengisi Zeolit Alam Siregar, Tiurlina; Wahjoedi, Bambang Ari
Jurnal Matematika dan Sains Vol 20 No 1 (2015)
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Komposit polietilen dengan bahan pengisi zeolit alam, mempunyai kekerasan yang tinggi sehingga dapat digunakan untuk kemasan plastik yang kaku dan keras. Zeolit yang digunakan untuk pembuatan komposit ini berasal dari Sentani Kabupaten Jayapura, Papua. Zeolit alam dikarakterisasi dengan menggunakan teknik difraksi sinar-X (XRD) menunjukkan sebagian besar jenis mineralnya tersusun dari mordenit (CaNa2K2)Al2Si10O24. Pembuatan material komposit dilakukan dengan cara mencampurkan polietilen dengan bahan pengisi zeolit alam yang dipanaskan pada suhu 190 oC selama 8 menit dengan variasi berat 1 - 65%, dan ukuran butir -150 + 200 mesh. Karakterisasi komposit dengan inframerah (IM) menunjukkan spektrum IM 3684cm-1 (gugus OH pada SiO4 dan AlO4), 1008,7 cm-1 (gugus SiO-). Komposit hasil penelitian mempunyai kekuatan saat putus lebih besar dari 16,890 MPa, kekuatan tarik lebih besar dari 26,372 MPa dan pemuluran putus lebih kecil dari 1,335%. Kekerasan komposit semakin meningkat sesuai dengan bertambahnya berat zeolit. Bahan ini tahan terhadap cuaca selama 16 minggu dan baik digunakan untuk pembuatan material struktur seperti pipa dan exsterior blind. Kata Kunci : Material, Komposit polietilen, Zeolit alam, Bahan pengisi. Preparation of Polyethylene Composite Using Natural Zeolite Functioned As Filler  Abstract Polyethylene composites with natural zeolite as fillers, have a high hardness, such that can be utilized as rigid and hard plastic packaging. Natural zolite used for current composite manufacturing was obtained from Sentani Jayapura, Papua. Structural charaterization of the natural zeolite which was conducted by XRD indicated that it mostly consists of mordenite (CaNa2K2)Al2Si10O24. Polyethylene composite material preparation had been carried out by blending the polyethylene metrix with natural zeolite as a Filler. Zeolite composition was varied with in the range of 1 - 65% (w/w). Zeolite grain size of - 150 + 200 mesh. was blended at the temperature of 190oC for 8 minutes. Infrared (IR) characterization showed that the spectrum of 3684 cm-1 (OH cluster at SiO4 and AlO4) 3400 -2500 cm-1 (CH Cluster), 1469,7 - 1452,3 cm-1 (C=C cluster), 135,2 cm-1 (AlO-cluster) 1008,7 cm-1 (SiO- cluster). The composites obtained have yield strengh ≥ 16.890 MPa, tensile strength ≥ 26.372 Pa and elongation at break ≤ 1.335%. The Hardness of the composite increases by increasing zeolite content. The composite resisted on weathering for 16 weeks of exposure. Keywords: Material, Polyethylene composite, Natural zeolite filler.
Pengembangan Komoditas Unggulan di Kabupaten Tanah Laut Kalimantan Selatan Raden, Rizki Amalia
Jurnal Matematika dan Sains Vol 21 No 1 (2016)
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Sektor pertanian merupakan agroindustri yang memiliki peran strategis dalam pembangunan daerah, baik sebagaipenyedia bahan pangan ataupun sebagai sumber pendapatan dan lapangan pekerjaan. Kabupaten Tanah Lautmemiliki beragam komoditas di sektor pertanian yang belum diketahui sebagai komoditas unggulan. Penelitian inibertujuan untuk menentukan komoditas unggulan, mengidentifikasi faktor-faktor yang mempengaruhipengembangan komoditas unggulan berdasarkan kriteria dan indikator yang sesuai, dan merumuskan strategi yangsesuai untuk mengembangkan komoditas unggulan di Kabupaten Tanah Laut. Metode penelitian penentuankomoditas unggulan dengan pendekatan Location Quotient (LQ), identifikasi faktor-faktor menggunakan PKIV(Prinsip, Kriteria, Indikator dan Verifier) dan strategi pengembangan komoditas menggunakan SWOT AHP Hybrid.Disimpulkan komoditas unggulan di Kabupaten Tanah Laut adalah komoditas karet, jagung dan sapi. Faktor-faktoryang paling mempengaruhi setiap komoditas: a) karet: ketersediaan lahan, kualitas bokar, permintaan pasar dankeberadaan lembaga pengawas mutu, b) jagung: keterampilan petani, keberadaan koperasi, permintaan pasar dankonversi komoditas, c) sapi: ketersediaan pakan, populasi ternak, pengusahaan sapi di tingkat petani, keberadaanpasar hewan. Strategi untuk pengembangan komoditas; a) karet: strategi WT yaitu pengembangan produk dimanaPemerintah Daerah memberikan pembinaan dan pengawasan mutu karet untuk meningkatkan nilai jual bokar, b)jagung: strategi SO yaitu penetrasi pasar dengan meningkatkan produksi jagung baik dari segi kualitas dankuantitas disertai dengan pengenalan dan penggunaan teknologi baru, c) sapi: strategi WT yaitu integrasihorisontal dengan memperbaiki prasarana kandang agar bersih dan aman dari pencurian serta dapat menjalinkemitraan dengan industri hilir.
Pengembangan Material Sorben Berbasis Zeolite dan Clay Alam se-bagai Media Desalinasi Air Laut Wibowo, Edy; Rokhmat, Mamat; Sutisna, Sutisna; Khairurrijal, Khairurrijal; Abdullah, Mikrajuddin
Jurnal Matematika dan Sains Vol 22 No 1 (2017)
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We have developed a sorbent based natural materials for seawater desalination application. We used clays, soil, rock and zeolite as raw materials. We conducted a thermal activation process to improve the sorption ability of the materials. The sorption ability of materials were tested to reduce the salinity of seawater and it is expressed by the reduction efficiency. The highest reduction efficiency (4%) was obtained from the activation of the soil at temperature of 600 ° C and the zeolite at a temperature of 200 ° C. It can be seen that the reduction efficiency was linearly increased with the increase of the doses of sorbent. We observed that the sorption ability of zeolite can be enhanced through thermal activation at a relatively low temperature so that it was potentially used as a low-cost sorbent material for seawater desalination.
Pengaruh Penambahan SiO2 dan PTFE Terhadap Respon Termolumi-nesensi TLD CaSO4:Dy Nuraeni, Nunung; Kartikasari, Dewi; Iskandar, Ferry; Haryanto, Freddy; Waris, Abdul; Hiswara, Eri
Jurnal Matematika dan Sains Vol 22 No 1 (2017)
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Thermoluminescence response of TLD CaSO4: Dy with a variation of the addition of SiO2 and PTFE materials has been observed. TLD CaSO4:Dy derived through co-precipitation method and then added by SiO2 and PTFE. Thermoluminescence intensity for CaSO4:Dy added by SiO2 obtained 9.41, 5.32; and 13.93 nC for the temperature at 400 °C, 600 °C and 700 °C. As for CaSO4:Dy with the addition of PTFE obtained 33.10;  336.89; and 1191.11 nC for the temperature at 400 oC temperature, 600 °C and 700 °C. Thermoluminscence intensity for CaSO4:Dy without the addition of SiO2 and PTFE at a temperature of 700 °C is 75.15 nC. There’s a significant increasing in the thermoluminescence intensity on CaSO4:Dy added by PTFE.
Kajian Karakter Bunga Coffea arabica L. Terkait Dengan Kemungkinan Aplikasi Lebah Madu Lokal Sebagai Agen Penyerbuk Sari, Dian Anggria; Putra, Ramadhani Eka
Jurnal Matematika dan Sains Vol 20 No 1 (2015)
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Kopi arabika merupakan salah satu tanaman bernilai ekonomi penting di dunia, dimana Indonesia memegang peranan dalam produksi kopi dunia. Salah satu usaha yang dapat dilakukan untuk meningkatkan kualitas produksi kopi adalah meningkatkan polinasi dengan bantuan serangga polinator yang telah didomestikasi, seperti lebah madu. Dalam proses aplikasi serangga penyerbuk ini diperlukan pengetahuan dasar mengenai karakteristik dari bunga kopi terutama berkaitan dengan kemampuan bereproduksi dan menarik kunjungan lebah madu. Karakteristik yang diamati pada penelitian ini adalah beberapa karakter bunga yang berkaitan dengan sindrom penyerbukan seperti warna, bentuk, dan panjang tabung bunga serta karakter yang menjadi "reward" bagi lebah madu dalam bentuk ketersediaan nektar dan polen serta kualitas dari nektar. Uji viabilitas polen menggunakan aceto-orcein 2% menunjukkan bahwa polen yang dihasilkan oleh kopi arabika lokal memiliki viabilitas sangat tinggi (96,92% ± 4,38). Hasil penelitian menunjukkan peningkatan aktivitas penyerbuk dapat meningkatkan efisiensi polinasi serta produksi biji kopi. Kata kunci: Kopi arabika, Viabilitas polen, Polinasi. Study of Flower Characteristics of Coffea arabica L. Related to Insect pollinators Visits in Pollination Efficiency Improvement Abstract Arabica coffee is one of the most important economic crop in the world and Indonesia could contribute more to total world production. One of efforts that could improve  qu  ality and quantity of coffee production is increasing pollination efficiency through application of domesticated insect pollinator, such as honey bees. Prior application, it is necessary to understand basic knowledge of  characteristics of coffee's flowers related to its reproductive potential and ability attract the honey bees. The main characters observed in this study  were color, scent, shape and length of the flower tube, availability and quality of nectar and pollen. Pollen viability test of local Arabica Coffee by aceto-orcein 2% showed high score (96.92% ± 4.38) while other flower's characteristics highly related to preference of honey bees to visit flowersOur study also shows that increasing the pollinator activity could increase pollination efficiency and coffee bean production. Keywords: Coffea arabica, Pollen viability, Pollination.
Penerapan Metode Simulated Annealing pada Penentuan Dana Tabarru dalam Model Profit and Loss Sharing pada Investasi Syariah Lazulfa, Indana
Jurnal Matematika dan Sains Vol 21 No 1 (2016)
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Industri jasa keuangan saat ini didominasi oleh perbankan konvensional dan individual yang banyak menerapkankelebihan atau bunga dari pinjaman yang diberikan, atau biasa dianggap sebagairiba. Pada kenyataannya,keadaan peminjam dapat menjadi semakin miskin karena pinjamannya ditambah dengan bunga berbunga yangsangat memberatkan. Makalah ini membahas penelitian tentang model matematika pada investasi syariah berupapemberian pinjaman usaha untuk ekonomi mikro dengan menerapkan sistem bagi hasil (musyarakah/profit and losssharing).Model investasi dengan penambahan Dana Tabarru dikembangkan dari model sebelumnya(Sumartidkk,2014,2015). Dana Tabarru merupakan himpunan dana yang berperan sebagai asuransi dan berasaldari kontribusi para peserta (pedagang) yang digunakan untuk menanggulangi kondisi kerugian dalam periodetertentu. Dalam model ini Dana Tabarru sebagai premi yang wajib dibayarkan apabila pedagang dalam kondisimasih mempunyai laba setelah melunasi angsuran pokok. Di dalam model syariah dengan Dana Tabarru terdapatoptimisasi premi, yang melibatkan masalah meminimumkan sisa Dana Tabarru dalam satu periode tertentu.Masalah optimisasi Dana Tabarru ini akan diselesaikan dengan menggunakan algoritma Simulated Annealing (SA).Hasil simulasi dengan data pedagang yang dibangkitkan menunjukkan bahwa model syariah dengan DanaTabarru memberi nilai lebih besar pada return investor dan porsi pedagang, daripada model syariahtanpa Dana Tabarru.
Aktivitas Fotokatalitik TiO2 yang Dilapiskan pada Polipropilena Berbentuk Lembaran dan Butiran Sutisna, Sutisna; Rokhmat, Mamat; Wibowo, Edy; Rahmayanti, Handika Dany; Khairurrijal, Khairurrijal; Abdullah, Mikrajuddin
Jurnal Matematika dan Sains Vol 22 No 1 (2017)
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The sheet and granule of polypropylene (PP) have been used as the support material for TiO2 catalyst. The TiO2 powder was coated to the polymer surface using a combination of electrostatic and heating methods (for the PP sheet) and thermal milling method (for PP granule). The photocatalytic testing of catalysts conducted on a 300 ml solution of Methylene Blue (MB) with initial concentration of 25 ppm. Under solar ilumination, the catalyst sheets have a higher photocatalytic activity than the catalyst granules.

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