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All Journal JURNAL ILMIAH PLATAX Jurnal Kelautan Tropis Journal of Applied Geospatial Information Omni-Akuatika Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Biologi Tropis EDUKATIF : JURNAL ILMU PENDIDIKAN Best Journal (Biology Education, Sains and Technology) Jurnal Laot Ilmu Kelautan Bubungan Tinggi: Jurnal Pengabdian Masyarakat International Journal Of Science, Technology & Management (IJSTM) Nusantara Hasana Journal ABDI SABHA (Jurnal Pengabdian kepada Masyarakat) JOMPA ABDI: Jurnal Pengabdian Masyarakat Jurnal Bangun Abdimas Jurnal Pengabdian Masyarakat Bhinneka Abdi Jurnal Publikasi Journal of Research and Publication Innovation Jurnal Medika: Medika Journal of Marine Studies

Welmar Olfan Barat, Welmar Olfan

Universitas HKBP Nomensen Pematangsiantar

Author-ID : 636151

Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Transportation Other

Published : 37 Documents Claim Missing Document

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Correlation Between Paddle Wheel Operation Time with Microalgae (Nannochloropsis sp.) Growth Rate and Lipid Contents in Open Raceway Ponds Welmar Olfan Barat; Mujizat Kawaroe; Dietriech G Bengen
Journal Omni-Akuatika Vol 13, No 1 (2017): Omni-Akuatika May
Publisher : Fisheries and Marine Science Faculty - Jenderal Soedirman University

Nannochloropsis sp. is one of microalgaes species with high lipid content, so it has great potential to be used as the source of biofuel. One of the microalgae cultivation system in mass scale is open raceway ponds. Problems faced in microalgae cultivation with open raceway ponds system are low productivity and the high production cost, especially high electrical energy for operating paddle wheel machine. This research studies about efficiency and effectiveness level of the cultivation system with open raceway ponds through the analysis of correlation between operational duration of the paddle wheel with growth rate and lipid content from Nannochloropsis sp.. The highest density is 530x106 cell/ml found in treatment of 45min/h. The highest growth rate is 0,45/days Which also found in the treatment of 45min/h but the treatment 45min/h is only able to survive until 12 days. The highest productivity of dry biomass is 0,25 g/L/day found in treatment of 45min/h. Meanwhile, the highest lipid content contained on treatment 15min/h is 5,19%DCW. Dominant fatty acids for all treatments are palmitic acids. The best treatment related to the use of the paddle wheel machine is 15min/h.

Potret Model Pembelajaran Daring Online terhadap Perkuliahan Praktikum Masa Pandemi Covid-19 Srinatalia Silaen; Welmar Olfan Basten Barat
EDUKATIF : JURNAL ILMU PENDIDIKAN Vol 3, No 6 (2021): December Pages 3500-5500
Publisher : Universitas Pahlawan Tuanku Tambusai

Dalam kurun waktu setahun belakangan, kita semua menghadapi wabah pandemi dari virus yang membuat seluruh manusia dan mobilitasnya terganggu, termasuk aspek pendidikan, kesehatan, ekonomi, industri bahkan sosial – budaya. Terlebih kita selaku tenaga pendidik dan menyentuh langsung dengan dunia pembelajaran bagi mahasiswa, turut terkena dampak dalam pengajaran yang awalnya tatap muka beralih ke sistem pembelajaran daring, oleh karena itu tujuan dari dilakukannya penelitian ini mengarah untuk proses perkuliahan secara virtual dan sistem secara online. Pada prosesnya, metode yang digunakan bagi para pengajar khususnya dosen adalah virtual dan online yang bisa membantu proses pengajaran terutama mata kuliah praktikum di Program studi Biologi. Adapun hasil dari dilakukannya korespondensi dari tahap wawancara antara dosen dan mahasiswa di semester VI, terlebih di pembelajaran praktikum yang sebelumnya dilakukan di laboratorium dan dimasa pandemi menjadi virtual. Pembelajaran daring menjadi pilihan efektif bagi para dosen dan mahasiswa dalam membantu program pemerintah belajar dari rumah (Daring) dan mengurangi mobilitas seperti sedia kala, dan kita berharap agar pandemi segera berlalu dan covid-19 menjadi masalah kita bersama demi mengurangi dampak dari wabah Covid-19 ini

TSS Analysis (Total Suspended Soil) Using GEE (Google Earth Engine) Cloud Technology in Belawan Waters Mardame Pangihutan Sinaga; Jono Barita Sianipar; Ady Frenly Simanullang; Goldberd Harmuda Duva Sinaga; Ewin Handoco S; Welmar Olfan Basten Barat
Journal of Applied Geospatial Information Vol 6 No 2 (2022): Journal of Applied Geospatial Information (JAGI)
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jagi.v6i2.4317

The TSS research using GEE Cloud Technology in Belawan Waters was carried out from January to May 2021. The analysis was carried out using the Sentinel-2 Satellite. TSS results obtained that the amount is 0,011010879-53,74369064 mg/liter. The content of TSS is spread evenly around the outskirts of Belawan Waters to the Middle of Belawan Waters and has passed the quality standard limit according to the Minister of Environment of Republic Indonesia that means the Harbour area is polluted and improper for drinking water as well as for fish cultivation.

Penyuluhan Dampak Bakteri Coliform Fecal bagi Kehidupan Biota Air bagi Warga Simalungun Herna Febrianty Sianipar; Apriani Sijabat; Christa Voni Rouhlina Sinaga; Mardame Pangihutan Sinaga; Tambos Sianturi; Welmar Olfan Basten Barat
Bubungan Tinggi: Jurnal Pengabdian Masyarakat Vol 4, No 4 (2022)
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/btjpm.v4i4.6650

Masyarakat simalungun belum memiliki pengetahuan tentang dampak bakteri coliform fecal bagi lingkungan perairan terkhusus bagi biota air karena kualitas air di simalungun terus menerus menurun sehingga pengabdian ini bertujuan untuk memberikan penyuluhan tentang dampak bakteri coliform fecal bagi biota air. Pengabdian ini telah dilakukan pada bulan September-Oktober 2022 di simalungun dengan metode penyuluhan dan angket yang diikuti oleh peserta sebanyak 20 orang. Hasil penyuluhan menunjukan bahwa masyarakat paham 100% tentang dampak bakteri coliform fecal yang dapat membunuh biota air yang lain karena terjadi kompetisi memperebutkan oksigen dan jika terus menerus terjadi maka akan merusak lingkungan dan ekosistem perairan. Dari penyuluhan ini terlihat animo masyarakat sangat tinggi, dan mereka menjadi lebih paham tentang upaya memperbaiki kualitas air dengan mengurangi pembuangan limbah organik ke perairan di simalungun.Simalungun people have yet to learn the impact of faecal coliform bacteria on the aquatic environment, especially for water biota because the water quality in Simalungun continues to decline, so this service aims to provide education about the impact of faecal coliform bacteria on water. This service was carried out in September-October 2022 in Simalungun with the counselling and questionnaire methods that 20 participants attended. The counselling results show that the community understands 100% about the impact of faecal coliform bacteria, which can kill other aquatic biota due to competition for oxygen. If this continues, it will damage the environment and aquatic ecosystems. From this counselling, the community's enthusiasm is very high. They have become more aware of efforts to improve water quality by reducing the discharge of organic waste into waters in Simalungun.

STRUKTUR KOMUNITAS POHON MANGROVE DI KAWASAN DESA BAGAN ASAHAN KECAMATAN TANJUNG BALAI KABUPATEN ASAHAN Vaisal Raju Siahaan; Ewin Handoko; Welmar Olfan Basten Barat
BEST Journal (Biology Education, Sains and Technology) Vol 5, No 2 (2022): September 2022
Publisher : Program Studi Pendidikan Biologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/best.v5i2.6065

Mangrove forest is a plant that grows in coastal areas or in coastal areas, and estuarine areas that have an ecological function, namely as the last protector from the waves of sea water after coral reef ecosystems and seagrass ecosystems, as sediment catchers, foraging for fish, as fish spawning grounds and as fish breeding grounds. Research on the Community Structure of Mangrove Plants in the Bagan Asahan Village Area, Tanjung Balai District, Asahan Regency was conducted in August 2020 with the aim of knowing the structure of the mangrove community and environmental factors that affect the existence of mangrove plants in Bagan Asahan Village. The method used in observing the structure of the mangrove plant community is using the quadrant transect method by analyzing species density, relative density, species frequency, relative frequency, species dominance, relative dominance, and important value index at the tree level. Based on the results of the study, it was found that Avicennia marina, Bruguiera gymnorrhiza and Rhizopora apiculata had the highest INP at the tree level. Further research is needed on the structure of the mangrove community in the same place and with different stations so that the mangrove data can represent the entire area of Bagan Asahan Village. The author suggests to further preserve mangroves.

Laju Pertumbuhan dan Kandungan Lemak Nannocloropsis sp. dengan Penambahan Mangnesium (Mg) dan Besi (Fe) Herlina Adelina Meria Uli Sagala; Setya Indra Padma Putri; Welmar Olfan Basten Barat
Jurnal Laot Ilmu Kelautan Vol 4, No 2 (2022): Jurnal Laot Ilmu Kelautan
Publisher : Universitas Teuku Umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jlik.v4i2.6040

Nutrien seperti magnesium dan besi dan kondisi lingkungan optimum berperan untuk pertumbuhan dan lemak yang dihasilkan oleh Nannochloropsis sp. Laju pertumbuhan dan lemak Nannochloropsis sp diamati untuk mengetahui pengaruh penambahan konsentrasi magnesium dan besi dalam media kultivasi. Kultivasi Nannochloropsis sp menggunakan skala semi massal secara outdoor dengan 3 perlakuan yaitu kontrol, magnesium dan besi. Magnesium dan besi ditambahkan dalam media dengan 3 tingkat konsentrasi yaitu 1x, 3x dan 5x dan. Laju pertumbuhan Nannochloropsis sp diamati setiap hari dan kandungan lemak diuji dengan metode Mojonnier. Hasil penelitian menunjukkan laju pertumbuhan Nannochloropsis sp dengan penambahan magnesium 0.319/hari dan penambahan besi 0.256/hari lebih tinggi dibandingkan kontrol. Sehingga lemak yang dihasilkan menjadi lebih tinggi sebesar 4.16% dan 2.27%. Hal ini menunjukkan bahwa penambahan konsentrasi magnesium dan besi pada kultivasi Nannochloropsis sp meningkatkan laju pertumbuhan sehingga lemak yang dihasilkan menjadi lebih tinggi.

Analysis Of Variation Of Paddle Wheel Photovoltaic Wheel Form In Microalgae Cultivation On Electricity Consumption Winfrontstein Naibaho; Welmar Olfan Basten Barat; Romson Hiras Naibaho
International Journal of Science, Technology & Management Vol. 3 No. 6 (2022): November 2022
Publisher : Publisher Cv. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46729/ijstm.v3i6.669

The main problem that is often found in the failure of microalgae production is poor water quality during the maintenance period. One of the causes of deteriorating water quality is the lack of oxygen which endangers microalgae which can inhibit cell growth so that it can reduce its productivity. On this basis, efforts are needed to refresh the water or aeration to help increase the dissolved oxygen (DO) level in the microalgae growth container using a paddle wheel. The development of an aerator blade design that has optimum efficiency is needed to reduce high electricity consumption and see more effective cell growth. For these problems, in this study, variations of the paddle wheel will be analyzed. Variations in the shape of the wheel used, namely straight and curved with the available aerators, are expected to have an optimum speed, area coverage and increase the amount of dissolved oxygen (DO). The method used is the experimental method . Based on this research, it was found that an increase in the value of cell growth occurred in variations in the shape of a straight paddle wheel of 122 cells/ml .

Gastropoda Laut dan Chiton di Mikrohabitat Bangunan Pelindung Pantai Pelabuhan Krueng Geukueh Provinsi Aceh Cut M. N. ‘Akla; Fitra Wira Hadinata; Nur Ikhsan; Welmar Olfan Basten Barat; Hendrik V. Ayhuan; Muhammad Hatta; Riri Ezraneti; Syahrial Syahrial
Jurnal Kelautan Tropis Vol 25, No 3 (2022): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v25i3.14950

The study was carried out in March 2022 at 8 observation stations in the Krueng Geukueh Harbor coastal protection facility in Aceh Province, using the visual encounter method for 120 minutes. The Shannon-Weaver diversity index, Simpson dominance, and Shannon-Weaver uniformity were used to generate the gastropod ecology index, while PCA was used to examine dominance by specific species and CA was used to analyze similarities in species composition. The study's findings included 20 species, 7 families, and a group of chitons. Gastropods Littorina angulifera, Echinolittorina puncatata, Nerita chamaeleon, Mauritia arabica, Thais mancinella, Morula musiva and Herba corticata are classified as rare (relative frequency < 20%); Littorina undulata, Nerita planospira, Cypraea mauritiana and Chiton sp. classified as occasional (relative frequency 21 – 40%); Littorina brevicula and Echinolittorina placida are relatively common (relative frequency 41 – 60%); Nerita albicilla, Nerita costata, Tylothais virgata and Tenguella granulata are relatively common (relative frequency 61 – 80%); and Thais (Thalesa) aculeata, Trochus radiatus and Cellana radiata were found to be relatively abundant (relative frequency > 80%). The gastropod diversity and uniformity indices were both low (1.49 and 0.48, respectively), where as the dominance index was moderate (0.52). The PCA analysis revealed that the dominant gastropod species were C. mauritiana, M. arabica, and M. musiva, and the CA analysis revealed the establishment of three groups based on the species composition discovered as a result of human activities near the study site. Kajian dilakukan pada bulan Maret 2022 di 8 stasiun pengamatan pada bangunan pelindung pantai Pelabuhan Krueng Geukueh Provinsi Aceh menggunakan metode visual encounter selama 120 menit. Indeks ekologi gastropoda dihitung dengan indeks keanekaragaman Shannon-Weaver, dominansi Simpson dan keseragaman Shannon-Weaver, sedangkan dominansi oleh spesies tertentu dianalisis menggunakan PCA dan kesamaan komposisi spesiesnya dianalisis menggunakan CA. Hasil kajian mendapatkan 20 spesies dan 7 famili serta ditemukan juga kelompok chiton. Gastropoda Littorina angulifera, Echinolittorina puncatata, Nerita chamaeleon, Mauritia arabica, Thais mancinella, Morula musiva dan Herba corticata tergolong langka ditemukan (frekuensi relatif < 20%); Littorina undulata, Nerita planospira, Cypraea mauritiana dan Chiton sp. tergolong sesekali ditemukan (frekuensi relatif 21–40%); Littorina brevicula dan Echinolittorina placida tergolong sering ditemukan (frekuensi relatif 41–60%); Nerita albicilla, Nerita costata, Tylothais virgata dan Tenguella granulata tergolong umum ditemukan (frekuensi relatif 61–80%); serta Thais (Thalessa) aculeata, Trochus radiatus dan Cellana radiata tergolong melimpah ditemukan (frekuensi relatif >80%). Indeks keanekaragaman dan keseragaman gastropodanya tergolong rendah (1.49 dan 0.48), sedangkan indeks dominansinya tergolong sedang (0.52). Dari analisis PCA didapatkan spesies gastropoda yang mendominasi adalah C. mauritiana, M. arabica dan M. Musiva, kemudian hasil analisis CA memperlihatkan adanya pembentukan tiga kelompok berdasarkan

Sosialisasi Pengaruh Variasi Sudut Sambungan Terhadap Loses Aliran Pipa Di Sidikalang Winfrontstein Naibaho; Welmar Olfan Basten Barat; Ewin Handoco Saragih
ABDI SABHA (Jurnal Pengabdian kepada Masyarakat) Vol. 3 No. 1 (2022): Februari
Publisher : CERED Indonesia Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53695/jas.v3i1.780

Pengetahuan masyarakat akan diperkenalkan mengenai pengaruh variasi sudut sambungan terhadap loses aliran pipa di Sidikalang, tepatnya di Kelurahan Pegagan Hilir, yang mana merupakan salah satu kecamatan di Kota Sidikalang.. Metode yang digunakan pada program ini adalah pengenalan materi melalui ceramah dan diskusi. Materi yang disampaikan adalah Pengaruh sambungan pada pipa terhadap laju aliran. Pemberdayaan warga melalui kegiatan penyuluhan, edukasi, pelatihan (interaksi dan komunikasi), serta dialog dengan warga di komunitas. Selain itu diperlukan dukungan kemitraan dengan membangun jejaring dan mekanisme kerja sama kelembagaan antara warga . Secara keseluruhan, pelaksanaan berjalan lancar, seluruh masyarakat sangat antusias dalam mengikuti penyuluhan tersebut. Berdasarkan evaluasi tingkat pemahaman masyarakat, program ini dinilai berhasil, terbukti dengan adanya peningkatan pemahaman masyarakat terhadap penerapan prinsip-prinsip mekanika fluida dan mengetahui kerugian energi pada suatu system seperti gesekan dengan dinding, perubahan luas penampang, sambungan, katub dampak variasi sudut sambungan terhadap loses aliran pipa.

Pelatihan Kultivasi Mikroalga Skala Open Raceway Ponds Welmar Olfan Basten Barat; Winfrontstein Naibaho
ABDI SABHA (Jurnal Pengabdian kepada Masyarakat) Vol. 3 No. 1 (2022): Februari
Publisher : CERED Indonesia Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53695/jas.v3i1.781

The high cultivation activity in Indonesia presents its own challenges, namely the high production costs which result in the burden of using feed (pellets). Therefore it is necessary to make a new breakthrough to overcome this problem, namely by utilizing microalgae as natural food for fish, especially in the seed phase. Besides being able to reduce production costs, it is also able to produce superior seeds. Microalgae are aquatic plants that have a very important role in waters because they are at the bottom of the food chain system (primary producers). Microalgae are a type of aquatic plant that can grow in a relatively short time. During its life, microalgae go through 5 phases namely the lag phase, logarithmic phase, decreased growth phase, stationary phase and death phase. Microalgae biomass contains important materials that are very useful, such as proteins, carbohydrates, fats and nucleic acids. The microalgae content can be used as a basis for making quality natural food. The aim of this training is to improve community skills in conducting mass-scale microalgae cultivation using the Open raceway ponds method independently. The results of the training showed that the level of understanding and technical ability of the participants was good based on the results of the material exam and the results of the practical tests measuring air quality and measuring the density of microalgae cells.

Co-Authors Ady Frenly Simanullang Ananda Yuli Fazilah Tanjung Andry Agasi Hasiholan Purba Apriani Sijabat Cut Meurah Nurul ‘Akla Deo Kartiko Ambarita Dietriech Geoffrey Bengen Elina Lulu Rumapea Elprinawati Purba Erlangga Erlangga Ewil Wiranda Sitorus Ewin Handoko Fitra Wira Hadinata Gokma Nababan Goldbert Harmuda Duva Sinaga Hadinata, Fitra Wira Handoco S, Ewin Handoco, Ewin Hendrik V. Ayhuan Heppy Theresia Sitompul Herlina Adelina Meria Uli Sagala Herman Herman Herna Febrianty Sianipar Herna Febrianty Sianipar Ivan Gultom Jono Barita Sianipar Leni, Yusyam manik, ria retno Manik, Riau Wanshi Mardame Sinaga Mardiah, Nur Ainun Muhammad Hatta Mujizat Kawaroe NAIBAHO, RONALD NAIBAHO, TOGAR Naibaho, Winfronstein Naibaho, Winfrontstein Natalia Murni Br Situmorang Novita Simanjuntak Nur Ikhsan Nur Jannah Ginting Pakpahan, Dany Alberto Purba, Ricky Tommy Fransiskus Putri Winda Sidabutar Reaful Samuel Reaful Samuel Sitorus Retno, Ria Riau Wanshi Manik Riri Ezraneti Romson Hiras Naibaho Ronita Haulian Simamora S, Ewin Handoco Saragih, Ewin Handoco Sarah Aufah Athiya Setya Indra Padma Putri SIANTURI, TAMBOS AUGUST Siburian, Daniel Tony E Silaen, Srinatalia Simamora, Ronita Haulian Sinaga, Christa Voni Roulina Sinaga, Mardame P Sinaga, Mardame Pangihutan Sitio, Lista Celsi Wilda Sitorus, Reaful Samuel Sri Maneni Manurung Srinatalia Silaen Srinatalia Silaen Srinatalia Silaen Syahrial Syahrial SYAHRIAL SYAHRIAL Vaisal Raju Siahaan Wendy Sudito Pakpahan

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