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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences BULETIN OSEANOGRAFI MARINA Jurnal Geodesi Undip Jurnal Desiminasi Teknologi Jurnal Teknik Sipil Seminar Nasional Lahan Suboptimal Journal Multicultural of Islamic Education Jurnal Riset Inossa : Media Hasil Riset Pemerintahan, Ekonomi dan Sumber Daya Alam JURNAL HUTAN TROPIS JOURNAL OF WETLANDS ENVIRONMENTAL MANAGEMENT El-Mal: Jurnal Kajian Ekonomi & Bisnis Islam Jurnal Hukum Islam Reflection: Islamic Education Journal Journal of Ekonomics, Finance, and Management Studies Mutiara Pendidikan dan Olahraga
Muhammad Helmi
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Religion Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Social Sciences Other

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Aplikasi Teknologi Geomatika untuk Pemetaan Penurunan Tanah (Land Subsidence) di Pesisir Kota Semarang Agus Hartoko; Anindya Wirasatria; Muhammad Helmi; Bhaskoro Rochaddi
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 13, No 1 (2008): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (20.795 KB) | DOI: 10.14710/ik.ijms.13.1.13-18

Abstract

Beberapa fenomena alam di kawasan pesisir dan kemudian menjadi bencana alam yang terjadi dalam kehidupan sehari hari diantaranya banjir, rob, longsor, gunung meletus, tsunami dan yang terjadi di Kota Semarang khususnya, adalah penurunan tanah (land-subsidence). Penelitian diiakukan dengan melakukan pengukuran perubahan ketinggian tanah berdasarkan 60 Titik Tinggi Geodesi (TTG-Bakosurtanal) maupun Bench Mark (BM) yang ada dikota Semarang dan data posisi koordinat masing-masing dengan GPS (Global Positioning System). Data geodetik yang diperoleh di transformasi menjadi data numerik, dan proses analisa geo-statistik diiakukan dengan metoda Kriging memakai perangkat lunak ER_Mapper 6.4 (Licensed user) dan Arc_GIS. Di samping data hasil pengukuran dilapangan, digunakan juga data Spaceshuttle Radar for Terrain Model (SRTM) untuk membentuk citra kontur 3 dimensi, juga menggunakan data citra Landsat_ETM. Berdasarkan data pengukuran yang diiakukan di lapangan dan rangkaian analisis spasial maka dapat dibuat plot laju penurunan tanah dan diketahui bahwa laju penurunan tanah Kota Semarang berkisar antara 1-9 cm/tahun, sehingga memerlukan pemetaan ulang, evaluasi tata ruang dan peraturan daerahKata kunci: penurunan tanah, kawasan pesisir, geo-statistik
Analisis Respon Spektral dan Ekstraksi Nilai Spektral Terumbu Karang Pada Citra Digital Multispektral Satelit ALOS-AVNIR di Perairan Gugus Pulau Pari, Kepulauan Seribu, Jakarta. Muhammad Helmi; Agus Hartoko; Herkiki S; Munasik Munasik; S Wouthuyzen
Buletin Oseanografi Marina Vol 1, No 1 (2011): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (374.576 KB) | DOI: 10.14710/buloma.v1i1.2989

Abstract

Abstract Coral reef and other coastal ecosystem map are very important spatial data to provide for many coastal management and planning purposes in Indonesia. Pari Islets of Thousand Islands in the northern coast of Jakarta has great variation on complex coastal ecosystem, such as beach forest, mangrove, coral reefs and seagrass. These rather large shallow and clear water islets could be ideal for satellite image spectral-respond study. The study aimed to asses spectral respond and spectral value of coral reef extraction on ALOS-AVNIR multispectral-satellite image in Pari Islets of Thousand Islands, Jakarta. THSI 4-band multispectral satellite image dated 30 April 2008 (JAXA, 2008) with 10 m spatial resolution. Ground survey was conducted in 85 sampling points between June-July 2009. A set of image processing method including geometric correction, atmospheric calibration (enhanced dark pixel correction), water column correction, Lyzenga transform, Hue Saturation Intensity (HSI) transform, Principle Component 1, scattergram analysis, spectral comparison, was applied for the multispectral image analysis, accompanied by   a Line Intercept Transect (LIT) and Manta-taw field survey for the coral reef study. The result showed that coral reef covers area in Pari islets were 249.9 ha (26.5%), seagrass 313.6 ha (33.3%) and shallow water sand 378.9 ha (40.2%).  Spectral characteristic of green and red band were much better on differentiating between coral reef and other shallow water substrate compared to the other bands. Visually coral reef identification on HSI transformed image much easier compared to on Lyzenga transformed image. The map accuracy on HSI (88.1%) also higher than Lyzenga (77.3%). Spectral values of coral reef on scattergram were clumped only on specific location and easily differentiated from other shallow water substrates, and so coral reef patch on ALOS-AVNIR satellite image could be extracted directly from the scattergram.   Key Word: Spectral respond, Coral reef, ALOS-AVNIR, Multispectral      
ANALISA SPASIAL DINAMIKA MORFOMETRI WADUK MENGGUNAKAN DATA SATELIT MULTI TEMPORAL DI WADUK RAWA PENING PROVINSI JAWA TENGAH Adiasti Rizqi Hardini; Muhammad Helmi; Bandi Sasmito
Jurnal Geodesi UNDIP Volume 1, Nomor 1, Tahun 2012
Publisher : Departement Teknik Geodesi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1056.478 KB)

Abstract

Waduk Rawa Pening berada di antara jalan negara Semarang – Salatiga - Surakarta dan jalan Kabupaten antara Salatiga – Ambarawa yang terletak diantara jalan negara Semarang – Magelang – Yogyakarta, 32 km ke arah selatan dari kota Semarang dan 10 km ke arah utara dari kota Salatiga. Waduk Rawa Pening mempunyai peranan yang cukup penting sebagai pembangkit listrik tenaga air, bertani eceng gondok dan beternak ikan. Pertumbuhan eceng gondok yang semakin meningkat dari tahun ke tahun mengakibatkan perubahan morfometri waduk dan perubahan tutupan lahan disekitar Waduk Rawa Pening. Penelitian ini menggunakan Peta Topografi skala 1:50.000 lembar Ambarawa no helai 47/XL-D, data citra satelit landsat TM 5 tahun 1990, landsat 7 ETM+ tahun 2000, ALOS AVNIR-2 tahun 2009 dan dilakukan dengan metode penginderaan jauh yaitu interpretasi manual untuk memperoleh peta tutupan lahan. Tujuan penelitian ini adalah mengkaji dinamika morfometri Waduk Rawa Pening Provinsi Jawa Tengah dalam periode ±10 tahun dimulai dari tahun 1982 sampai dengan tahun 2009 dan mengkaji dinamika perubahan pola tutupan lahan di area sekitar Waduk Rawa Pening Provinsi Jawa Tengah. Hasil penelitian menunjukan bahwa tahun 1982-1990 perubahan luas waduk sebesar 1051,85 Ha dan pola perubahn tutupan lahan yang terjadi yaitu perubahan sawah irigasi menjadi sawah dan permukiman menjadi air, pada tahun 1990-2000 perubahan luas waduk sebesar 305,24 Ha dan pola perubahan tutupan lahan yang terjadi yaitu perubahan air waduk menjadi sawah irigasi.serta tahun 2000-2009 perubahan luas waduk sebesar 392,97 Ha dan pola perubahan tutupan lahan yang terjadi yaitu perubahan air waduk menjadi sawah irigasi.
PEMODELAN SPASIAL ALIRAN PERMUKAAN MENGGUNAKAN DATA SATELIT TERRA ASTER-GDEM DI DAERAH TANGKAPAN HUJAN WADUK RAWA PENING PROVINSI JAWA TENGAH Tika Murni Asih; Muhammad Helmi; Bandi Sasmito
Jurnal Geodesi UNDIP Volume 1, Nomor 1, Tahun 2012
Publisher : Departement Teknik Geodesi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (405.191 KB)

Abstract

Waduk Rawa Pening merupakan salah satu kawasan prioritas di Jawa Tengah dan memiliki keunggulan komparatif yang tidak dimiliki oleh kawasan lainnya,sehingga perlu didayagunakan secara optimal dan berkelanjutan. Kondisi Waduk Rawa Pening saat ini mengalami penurunan dalam hal daya dukung dan fungsi utama sebagai akibat sedimentasi dan pendangkalan. Penelitian ini bertujuan untuk mengetahui pola aliran permukaan dan pengaruh penggunaan lahan di daerah tangkapan hujan yang aliran airnya masuk ke dalam Waduk Rawa Pening. Penelitian ini dilakukan dengan metode penginderaan jauh yaitu dengan interpretasi citra satelit ALOS AVNIR-2 dan citra satelit Landsat 7 ETM+  untuk memperoleh peta penggunaan lahan tahun 2009. Pemetaan daerah tangkapan hujan dalam penelitian ini diperoleh dari hasil pengolahan data ASTER-GDEM produk satelit Terra. Berdasarkan daerah tangkapan hujan tersebut kemudian dilakukan analisa komposisi penggunaan lahan yang ada di dalamnya. Hasil penelitian menunjukkan bahwa pola aliran yang terbentuk di daerah tangkapan hujan Waduk Rawa Pening adalah pola aliran yang menyerupai percabangan pohon (dendritic). Berdasarkan analisa penggunaan lahan yang telah dilakukan pada 25 daerah tangkapan hujan, ada 4 daerah tangkapan hujan yang mengalami kerusakan, yaitu Gajahbarang, Panjang Timur, Parat Kidul dan Tranah. Empat daerah tangkapan hujan ini memiliki persentase hutan kurang dari 30%, sehingga dikatakan kondisi lahannya sangat buruk. Kata kunci : ASTER-GDEM, Aliran Permukaan, Daerah Tangkapan Hujan
ANALISIS FAKTOR YANG MEMPENGARUHI KINERJA CIRCUIT BREAKER AKIBAT DISTORSI HARMONIK DAN NON HARMONIK Muhammad Helmi
JURNAL DESIMINASI TEKNOLOGI Volume 4 No. 1 Januari 2016
Publisher : UNIVERSITAS TRIDINANTI PALEMBANG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52333/destek.v4i1.261

Abstract

Abstrak: Penyebab harmonik menurut standard IEEE 519-1992 terdiri dari beban elektronika daya, seperti converter, inverter, rectifier, transformator dan motor-motor listrik. Total Harmonic Distortion (THD) merupakan nilai prosentase antara total komponen harmonisa dengan komponen fundamentalnya. Semakin besar prosentase THD menyebabkan semakin besarnya resiko kerusakan peralatan akibat harmonisa yang terjadi pada arus maupun tegangan. Berdasarkan karakteristik circuit breaker tidak akan trip pada batas arus nominalnya, melainkan melebihi batas yang telah ditentukan sebesar In (rated current) ke ind(no tripping current) yang merupakan proses bimetalnya bekerja (mulai panas) sampai dengan id (tripping current) pada waktu yang telah ditentukan. Dari hasil pengukuran dan perhitungan didapatkan dari arus beban 2 A : VTHD tertinggi 1,71% ; serta daya hilang akibat distorsi rata-rata 2,35 VA (0,52%). Arus beban 4 A : VTHD tertinggi 1,6% serta daya yang hilang 2,47 VA (0,28%). Arus beban 6 A : VTHD tertinggi 1,6%, daya yang hilang akibat distorsi rata-rata 3,32 VA (0,25%). Kualitas jenis produk juga akan berpengaruh kinerja circuit breaker, dari hasil pengujian circuit breaker 6 A diberi beban linier 7,5 A waktu trip produk I (31,5 menit), II (57,35 menit), III (53,75 menit). Saat diberi beban non linier 7,5 A waktu trip lebih cepat dimana produk I (25,38 menit) produk II (43,72 menit) dan produk III (43,53 menit).Kata kunci: Listrik, Linier, Harmonik, Karakteristik, Circuit breaker.
Sebaran Residu Insektisida Parathion pada Lahan Pertanian Bawang Merah di Kecamatan Wanasari Kabupaten Brebes Indratin Indratin; Mochamad Arief Budihardjo; Muhammad Helmi
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Publisher : Pusat Unggulan Riset Pengembangan Lahan Suboptimal (PUR-PLSO) Universitas Sriwijaya

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Abstract

Indratin I, Budihardjo MA, Helmi M. 2020. Distribution of parathion insecticide residue in shallot agriculture land in wanasari sub-district, Brebes regency. In: Herlinda S et al. (Eds.), Prosiding Seminar Nasional Lahan Suboptimal ke-8 Tahun 2020, Palembang  20 Oktober 2020. pp. xx.  Palembang: Penerbit & Percetakan Universitas Sriwijaya (UNSRI).The use of pesticides in agricultural land tends to be excessive because farmers think that pesticides can increase yields. It can also pollute the environment. Many farmers often use organophosphate insecticides as the efforts in controlling the pests of shallot plant organisms, one of which is Parathion. The use of Parathion has been banned by the Indonesian government since 2015 for agriculture. This research aims to determine the distribution of Parathion residue in the lower red agricultural land in Wanasari sub-district, Brebes Regency. The research was carried out in March - July 2020 in Wanasari sub-district. Soil samples were taken to the Integrated Laboratory of the Indonesian Agricultural Environment Research Institute to be analyzed the residual content of Parathion by using the QueCheRS method. The mapping of the residue distribution method used ArcGIS 10.4 with the Spline interpolation method. The results of laboratory analysis identified the residual content of Parathion between <LoD : 0.0025 mg kg-1 to 0.0956 mg kg-1. The residual content of the Parathion which was identified to exceed the LoD value was spread over 17 soil sampling points, all identified below the MRLs  value. The identified land area in the very low category was 806.08 ha and identified as low was 1,563.81 ha. The distribution of parathion residues in shallot agricultural land in Wanasari sub-district was identified in the very low and low categories, this needs to be watched out for because it is possible for the farmers to still use parathion type insecticides in shallot cultivation.
ANALISIS SALURAN PEMASARAN KULIT KAYU MANIS (Cinnamomum burmannii) DI KECAMATAN LOKSADO KALIMANTAN SELATAN Arfa Agustina Rezekiah; Muhammad Helmi; Lolyta Lolyta
Jurnal Hutan Tropis Vol 1, No 3 (2013): Jurnal Hutan Tropis Volume 1 Nomer 3 Edisi November 2013
Publisher : Lambung Mangkurat University-Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jht.v1i3.1547

Abstract

Tujuan penelitian ini adalah menganalisis saluran tataniaga kayu manis, menghitung biaya tataniaga pada saluran kayu manis, menganalisis distribusi margin pemasaran kayu manis, menganalisis efisiensi sistem tataniaga kayu manis. Penelitian dilaksanakan di Kecamatan Loksado.  Objek penelitian adalah petani dan pengumpul kayu manis serta para pelaku ekonomi pemasaran yang terkait dalam saluran pemasaran.  Data-data yang telah diperoleh kemudian dianalisa berdasarkan margin pemasaran (Mp = Pr – Pf     atau     Mp = ∑ Bi + ∑ Ki), , bagian petani (Sp = Pf/Pr  x 100%), margin keuntungan (Mki = Harga Jual – (Harga Beli + Biaya)) dan mark up on selling (Mark up on selling (Efisiensi operasional) = (Margin pemasaran / Harga jual) x 100%).  Hasil penelitian menunjukkan bahwa saluran pemasaran untuk kayu manis di Kecamatan Loksado ada 4 pola yaitu: (1) Petani-Konsumen (2) Petani-Pengumpul-Pedagang-Konsumen (3) Petani-Pengumpul-Pedagang Besar-Konsumen (4) Petani-Pengumpul-Pedagang Besar-Pedagang Kecil-Konsumen.  Secara keseluruhan saluran pemasaran kayu manis adalah efisien. Jika ditinjau dari sudut pandang petani maka pola 1 (Petani – Konsumen) adalah yang lebih efisien karena petani mendapatkan keuntungan yang lebih banyak, dan jika ditinjau dari sudut pandang lembaga pemasaran maka pola 2 (Petani – Pengumpul – Pedagang (Kandangan) – Konsumen) yang lebih efisien. Kata kunci: kulit kayu manis, saluran pemasaran
PRO-BEBAYA EFFECTIVENESS AS A LEADING PROGRAM FOR THE GOVERNMENT OF SAMARINDA CITY Muhammad helmi
Jurnal Riset Inossa Vol. 4 No. 1 (2022): Juni
Publisher : Badan Penelitian dan Pengembangan Daerah Kota Samarinda

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54902/jri.v4i1.59

Abstract

Pro-Bebaya is the flagship program of the Mayor of Samarinda in 2022. However, as a pilot project, in 2021, one Neighborhood Association is appointed for each sub-district. Because the program is new, it is necessary to assess the effectiveness of its implementation with a progressive legal approach, namely the operation of law in society. After analyzing several problems. First, the regulations have been revised while the program has not been implemented. Second, the Pro-Bebaya changes/revisions did not have a significant impact. Initially, Pokmas were formed through Urban village meetings, then formed through community meetings. Deliberation in the field is more effective in the Urban village than in the community. Third, in the Pro-Bebaya provisions some assistants assist from the beginning of planning to report, however, during the 2021 Pilot Project, Gunung Panjang Village there was no assistance, and also during the planning and preparation of the RAB proposed by each Neighborhood Association for 2022 they were not accompanied by assistants. Fourth, in 2022 all of the neighborhoods made RAB not check the standard book. Fifth, based on the experience of the Gunung Panjang Pokmas in 2020 and 2021, they experienced difficulties in making reports and taxes. Because reporting does not have standards such as receipts, goods orders (SPB), and Work Received Minutes (BAPPHP), and the tax value is confusing. Sixth, the lack of clarity on the Pro-Bebaya regulations, who will occupy the self-management team among the planning team, implementing team, and supervisory team
Sebaran Residu Endosulfan dan DDT di Lahan Pertanian Kecamatan Wanasari, Kabupaten Brebes Poniman Poniman; Tri Retnaningsih Soeprobowati; Muhammad Helmi
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Publisher : Pusat Unggulan Riset Pengembangan Lahan Suboptimal (PUR-PLSO) Universitas Sriwijaya

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Abstract

Poniman P, Soeprobowati TR, Helmi M. 2020. Distributions residue of  endosulfan and DDT in  lands agricultural wanasari sub-district, Brebes regency. In: Herlinda S et al. (Eds.), Prosiding Seminar Nasional Lahan Suboptimal ke-8 Tahun 2020, Palembang 20 Oktober 2020. pp. xx. Palembang: Penerbit & Percetakan Universitas Sriwijaya (UNSRI).As the result of pesticide use by exaggerated on farming sector can causing land degradation. The movement of some shallot farmers agriculture from Brebes Regency to neighboring districts, such as Cirebon, Majalengka, and Kendal is evidence of the degradation of shallot land in Brebes. The pesticides of Endosulfan and DDT were many and often used to control pests during the green revolution. The research aimed to determine the distribution residues of endosulfan and DDT  in the upstream area of Wanasari sub-District. The research was carried out by taking soil samples in the field, analyzing pesticide residues in laboratory, and mapping the distribution of residues. A total of 45 soil sample points were collected from the upstream part rice fields of Wanasari sub-District, Brebes Regency. Residue analysis was carried out at the Integrated Laboratory of the Agricultural Environment Research Institute, using the QuEChERS method. Meanwhile, the residue distribution mapping used the Spline interpolation method. From the identified land of 4,688,825 ha, it was detected that the endosulfan residue in the high-very high category was 1,605,576 ha (34.2%) and the high-very high category of DDT residue was 752.2028 ha (16.0%).
Rendement and Characteristics of Wood Vinegar Produced from Ironwood Delinquent Waste through Clay Kiln Charcoaling Furnace Muhammad Faisal Mahdie; Violet Violet; Muhammad Helmi
Journal of Wetlands Environmental Management Vol 8, No 2 (2020): July - December
Publisher : Center for Journal Management and Publication

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (681.108 KB) | DOI: 10.20527/jwem.v8i2.231

Abstract

The study aimed to determine the rendement of charcoal and wood vinegar and to identify wood vinegar chemical compounds made from ironwood deliquent waste. The study was carried out by using charcoaling facilities at the charcoaling center in the village of Asam – Asam. The charcoal and wood vinegar rendements  were determined after ironwood delinquent waste was heated for 21 days with a temperature of approximately 400 - 600 ºC. The results showed that the rendement of the charcoal and wood vinegar were 14.02% and 0.05%, respectively. The research with wood vinegar characteristic before purification was pungent, however after purification, the results did not sting; color pH before purification was blackish-brown, however after purification it was pale brown yellow; the specific gravity before purification was 1.012 and after purification, it was 0.97; the pH before purification is 3.63 and after purification 3.41; and acid content before purification was 3.73% and after purification it was 3.66%. As a whole, the physics test of wood vinegar is categorized in Japan standard, however, the color only before purification is not standard. There are five chemical compounds identified in wood vinegar both before and after purification.
Co-Authors ABDULLOH Adhyaksa Saktika Drestanto Adiasti Rizqi Hardini Afirman Karyono Agus Hartoko Agus Indarjo Ainur Rofiq Sofa Anindya Wirasatria Arfa Agustina Rezekiah Bandi Sasmito Bhaskoro Rochaddi Didi Muhtarom Dwi Puspa Arini Hawinuti, Riska Herkiki S Himavan Prathista Nugraha Indratin Indratin Lintang Kurniawati Lolyta Lolyta M. Taufan Qoriadi Mochamad Arief Budihardjo Muhammad Faisal Mahdie Nurwijayanti Petrus Subardjo Poniman Poniman Rifanie Gazalie Rudhi Pribadi S Wouthuyzen Tika Murni Asih Tri Retnaningsih Soeprobowati Violet Violet