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All Journal Aquacoastmarine Acta Aquatica: Aquatic Sciences Journal Abdimas Talenta : Jurnal Pengabdian Kepada Masyarakat Electrices : Jurnal Otomasi Kelistrikan dan Energi Terbarukan Depik Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan AQUACOASTMARINE: Journal of Aquatic & Fisheries Sciences Depik Jurnal Ilmu-Ilmu Perairan, Pesisir, dan Perikanan
Desrita Desrita
Department Of Aquatic Resources Management, Agriculture Faculty University Of Sumatera Utara
Agriculture, Biological Sciences & Forestry Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Social Sciences Other

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APLIKASI BERBAGAI JENIS FUNGI UNTUK MENINGKATKAN PERTUMBUHAN BIBIT Rhizophora mucronata DI DESA PULAU SEMBILAN KECAMATAN PANGKALAN SUSU KABUPATEN LANGKAT Yunasfi; Patana, Pindi; Desrita
ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat Vol. 3 No. 2 (2018): ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (764.666 KB) | DOI: 10.32734/abdimastalenta.v3i2.4131

Abstract

Desa Pulau Sembilan merupakan desa yang terletak di wilayah pesisir pantai timur Sumatera Utara yang kondisi hutan mangrovenya telah rusak sebagai akibat aktivitas pembuatan tambak udang. Tanpa upaya peningkatan kesadaran dan ilmu pengetahuan pada masyarakat kondisi ini akan semakin berlarut-larut yang berdampak pada meningkatnya kerusakan lingkungan. Kegiatan pengabdian ini bertujuan untuk meningkatkan kesadaran masyarakat dan penerapan ilmu pengetahuan dan teknologi dalam rangka rehabilitasi dan meningkatkan minat masyarakat untuk menanam mangrove. Dalam kegiatan penerapan Ipteks ini digunakan berbagai jenis fungi yang sudah didapat pada kegiatan penelitian terdahulu. Fungi-fungi tersebut diperkirakan berperan dalam mempercepat proses dekomposisi serasah, sehingga unsur-unsur hara yang dibutuhkan oleh bibit mangrove lebih cepat tersedia. Jenis-jenis fungi yang diaplikasikan pada kegiatan penerapan ipteks ini adalah Aspergillus sp. 1, Aspergillus sp. 2 dan Curvularia lunata. Propagul mangrove yang digunakan dalam kegiatan berasal dari mangrove Rhizophora mucronata. Kegiatan penerapan Ipteks dapat berjalan lancar, masyarakat sangat antusias menerima sosialisasi yang disampaikan dan antusias dalam mengikuti seluruh kegiatan mulai dari pembibitan sampai kegiatan penanaman. Aplikasi fungi C. lunata memberikan dampak pertambahan tinggi yang lebih besar yaitu, rata-rata 1.88 cm setelah 7 minggu aplikasi. Adapun bibit R. mucronata yang diberi aplikasi fungi Aspergillus sp. 1 dan Aspergillus sp. 2 setelah 7 minggu perlakuan menunjukkan pertambahan tinggi yang lebih kecil, yaitu ratarata 1.63 cm dan 1.65 cm. Pertambahan tinggi bibit yang diberi perlakuan lebih besar dibanding kontrol. Diameter batang bibit R. styl R. mucronata osa yang diberi aplikasi fungi C. lunata, yaitu rata-rata 0.4 cm. Adapun diameter bibit R. stylosa yang diberi aplikasi fungi Aspergillus sp. 1 dan Aspergillus sp. 2, yaitu masing-masingnya 0.38 cm dan 0.35 cm. Diameter batang bibit R. mucronata kontrol lebih kecil dibanding diameter batang bibit R. mucronata yang diberi perlakuan dengan berbagai jenis fungi, yaitu 0.25 cm.
Penetrasi PV dan Ketidakseimbangan Beban Pada Feeder 1 Gardu Induk Wirobrajan DESRITA PARDI
Electrices Vol 3 No 1 (2021): Volume 3 Nomor 1 Tahun 2021
Publisher : Jurusan Teknik Elektro, Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/ees.v3i1.3818

Abstract

Pembangkitan listrik dengan menggunakan bahan bakar fosil dapat meningkatkan pemanasan global. Untuk mengurangi penggunaan bahan bakar fosil tersebut dapat diatasi dengan pengembangan dan pemanfaatan Energi Baru Terbarukan (EBT). Salah satu contoh dari EBT tersebut adalah Photovoltaic (PV). Penambahan  PV dengan penetrasi dan penempatan yang bervariasi memiliki pengaruh yang berbeda-beda terhadap aliran daya. Disisi lain, ketidakseimbangan beban mengakibatkan munculnya arus di netral trafo. Arus yang mengalir di netral trafo ini menyebabkan terjadinya losses (rugi-rugi), yaitu losses akibat adanya arus netral pada penghantar netral trafo dan losses akibat arus netral yang mengalir ke tanah. Tujuan penelitian ini adalah untuk melihat pengaruh masuknya PV ke sistem dengan penetrasi yang berbeda-beda. Penambahan PV di ujung dekat beban dengan penetrasi 10 %, 20% dan 30 % pada tegangan 0,38 kV menyebabkan losses naik sebesar 3,5 kW, 30,8 kW dan 101,6 kW, sedangkan Penambahan PV di tengah saluran dengan penetrasi 10 %, 20% dan 30 % pada tegangan 20 kV membantu mengurangi losses sebesar 9,4 kW, 11,4 kW dan 13 kW. Selain itu, untuk melihat load flow sistem saat terjadi ketidakseimbangan beban pada Wirobrajan substation feeder 1 yang terdiri dari 4 area penyaluran yaitu Ngestiharjo-pakuncen, Tegalrejo, Bumijo A dan Bumijo B dengan menggunakan ETAP (Electrical Transient Analyzer Program) 12.6.0.
Analisis Load Flow dan Short Circuit serta Pengaruh Peletakan photovoltaic (PV) pada GI Kentungan Feeder KTN07 DESRITA PARDI
Electrices Vol 4 No 1 (2022): Volume 4 Nomor 1 Tahun 2022
Publisher : Jurusan Teknik Elektro, Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/ees.v4i1.4434

Abstract

Pada pengoperasian sistem tenaga listrik diperlukan kualitas dan tingkat keandalan yang baik, salah satunya adalah tegangan yang sampai ke pelanggan tidak mengalami drop tegangan. Salah satu cara agar perencanaan dan pengoperasian tenaga listrik tersebut baik adalah dengan analisis load flow. Analisis load flow bertujuan untuk mengetahui karakteristik aliran daya yang berupa pengaruh dari variasi beban dan rugi-rugi pada aliran daya dan juga mempelajari adanya tegangan jatuh di sisi beban. Tujuan penulisan paper ini adalah untuk melihat dan menganalisa load flow sistem saat kondisi eksisting, hubung singkat (Short Circuit) dan pada saat adanya penambahan DG (Distributed Generation) yang mana pada penelitian ini DG yang dipakai adalah PV (photovoltaic). Analisa dilakukan pada GI (Gardu Induk) Kentungan feeder 3 (KTN07)  yang terdiri dari 23 area (KTN07-A sampai KTN07-W) dengan total 106 busbar. Penelitian menggunakan ETAP (Electrical Transient Analyser Program) 12.6.0.
Potensi, Tingkat Pemanfaatan dan Keberlanjutan Ikan Tembang (Sardinella spp.) di Perairan Selat Malaka, Kabupaten Serdang Bedagai, Sumatera Utara Rina Sari Lubis; Miswar Budi Mulya; Desrita Desrita
AQUACOASTMARINE Vol 1, No 1 (2013): JURNAL AQUACOASTMARINE VOLUME 1, NO 1, DESEMBER 2013
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (452.256 KB)

Abstract

Tembang fish (Sardinella spp.) is a small pelagic fish, which live inschooling. This fish can be caught using drift gill net gear, purse seine, handlinesand payang. The purpose of this study was to determine the potential ofsustainability with optimum fishing effort, utilization rates and insistence,sustainability and management of fish resources in Malacca Strait. The analysisof secondary data from 2008 to 2012 obtained from the Department of Marineand Fisheries Serdang Bedagai regency, and primary data obtained by performeda questionnaire related to the sustainability of tembang fish.The potential prediction performed with Fox model. The result shown thatMSY was 5.930,582 tons/year and optimum effort was 22.466 trips/year. Averageutilization rate of 44,95%, with an average rate of 77,26% insistence, whileallowable catch 4.744,465 tons/year. The sustainability of tembang fish,dimensional the ecological, technologies and institutions into unsustainablecategory. While economic and social dimensions included the category ofsustainable. The management efforts was by setting fishing season, the selectivityof fishing gear, prohibition of fishing gear and quota restrictions arrest.Keywords: Malacca Strait, Potential, Utilization, Sustainability, Sardinella spp.
STUDI ASPEK REPRODUKSI IKAN BAUNG (Mystus nemurus Cuvier Valenciennes) DI SUNGAI BINGAI KOTA BINJAI PROVINSI SUMATERA UTARA Vindy Rilani Manurung; Yunasfi Djayus; Desrita Desrita
AQUACOASTMARINE Vol 1, No 1 (2013): JURNAL AQUACOASTMARINE VOLUME 1, NO 1, DESEMBER 2013
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

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Abstract

Baung fish (Mystus nemurus CV) is a fish of high economic value. Thepurpose of research to reproductive aspects (sex ratio, gonad maturity level (TKG),gonad maturity index (IKG), first time size mature gonad, fecundity and eggdiameter). The study was conducted from March to May 2013 at three locations . Themethod used descriptive analytic .Sex ratio of Baung fish with unbalanced sex ratio with a value of 4.5>3.8.Gonad maturity level (TKG) found I- IV, while the male fish only I- III. gonadmaturity index (IKG) female fish 0.01-7.33% and 0.01-0.26% for male fish . The firstgonad size mature female fish is 268 mm . Fecundity of Baung fish is 18229-44 392eggs . Distribution diameter on the distribution of fish eggs female 0.38 to 2.05 mm.Keyword : Baung fish, Bingai river, Fish reproduction, Mystus nemurus CV.
Aktivitas Antimikroba Biji Teratai (Nymphaea pubescens L.) Terhadap Bakteri Aeromonas hydrophila, Streptococcus agalactiae dan Jamur Saprolegnia sp. Dewi Roma Widya; Dwi Suryanto; Desrita Desrita
AQUACOASTMARINE Vol 2, No 1 (2014): JURNAL AQUACOASTMARINE VOLUME 2, NO 1, AGUSTUS 2014
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

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Abstract

Disease prevention in fish using chemicals or antibiotics leads to microbial resistance. One alternative to control the fish disease is to use plant extract. The aim of this study was to investigate the antimicrobial activity of lotus seeds (Nymphaea pubescens L.) on pathogenic bacteria and fungi in fish. The lotus seed was extracted with several solvent, such as n-hexsane, ethyl-acetate, and methanol. Antimicrobial activity assay was carried out using disc diffusion method. Phytochemical preliminary test was done to determine seed chemical compounds. The brine shrimp lethality test was utilised to determine the extract toxicity. The result showed that all extracts inhibited Aeromonas hydrophila, Streptococcus agalactiae, and Saprolegnia sp. growth to some extent. The extract was to inhibit more to S. agalactiae with inhibition zone of 10.72 mm. In general extract of n-heksana was to inhibit more to the test microbes. Cytotoxic activity (LC50) was <1000 μg/ml. Preliminary test of phytochemical compound showed that extracts of lotus seed contains alkaloid, fenolic, glicoside, saponin and steroid/terpenoid.Keywords: Antimicrobial activity, microbial pathogenic, Nymphaea pubescens L.
Bivalvia di Perairan Pantai Cermin, Kabupaten Serdang Bedagai Nanda Mutia Hardianti; Yunasfi Djayus; Desrita Desrita
AQUACOASTMARINE Vol 2, No 1 (2014): JURNAL AQUACOASTMARINE VOLUME 2, NO 1, AGUSTUS 2014
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

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Abstract

The Cermin Beach has a higher natural value such as biodiversity, one of them is bivalve. The objective this research is to study the community structure of bivalve and waters condition in Pantai Cermin of Serdang Bedagai Regency. This research was conducted since June - August 2013 using transec method at 3 station and 4 time interval of sampling. The observed physical and chemical parameter are temperature, salinity, pH, DO, TSS, and type of basic substrate.Bivalve are found in Cermin Beach of Serdang Bedagai Regency consists 15 species, i.e. The species with most value on each station is Donax cuneatus with the abudance in station I that is 150 ind/m2, the abudance in station II that is 331 ind/m2 and abudance in station III is 247 ind/m2. The species diversity index of bivalve range from 0,85 – 1,22, uniformity index of bivalve range from 0,18 – 0,30, domination index of bivalve range from 0,35 – 0,57 and pollution index range from 1,23 – 1,61 is lightly polluted.Keywords: Bivalvia,Cermin Beach, Community Structure
PETA SEBARAN SALINITAS PADA SUMUR BOR DI KELURAHAN BELAWAN II KECAMATAN MEDAN BELAWAN Intan Iksaura Ginting; Yunus Afifuddin; Desrita Desrita
AQUACOASTMARINE Vol 2, No 1 (2014): JURNAL AQUACOASTMARINE VOLUME 2, NO 1, AGUSTUS 2014
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

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Abstract

People activity in sub district Medan Belawan II require very large. The purpose of this research was to analyze of salinity values and the type of water well drilling in the area of research, analyze the effect of depth of the well to salinity value, analyze salinity distribution map and figuring out how to manage water resources in Belawan II village. This research was conducted on june-july 2013 in village Belawan II, Subdistrict Medan Belawan, Medan. This research used ArcGIS 10 to got a map of the distribution of salinity. The result showed that number of wellbore included in good classification (333mg/l) was 4%, permitted (666-1333 mg/l) was 27%, doubting (1666-2000 mg/l) was 46% and dangerous (2333-3000 mg/l) was 24%. Freshwater was 4%, between fresh water and brackish water was 27% and brackish water was 69%. at a depth of 65-100m, were included in dangerous category was 24%, suspect 18%, allowed 1% and good category not found. At a depth > 100 meters the waters were included in the hazardous category not found, suspect 9%, allowed 44%, and good category was 4%. The most dominating salinity distribution was 1666 mg/l-2000 mg/l were included in suspect category. The most dominating salinity distribution was 1666 mg/l-2000 mg/l were included in suspect category. This result showed that intrusion has occurred in the wellbore, and the water quality wasn’t good to serve as drinking water.Keyword : Intrusion, Salinity, Wellbore
STUDI KLOROFIL-a DI KAWASAN PERAIRAN BELAWAN SUMATERA UTARA Study of chlorophyll-a around sea of Belawan, North Sumatera Amanda Paramitha; Budi Utomo; Desrita Desrita
AQUACOASTMARINE Vol 2, No 2 (2014): JURNAL AQUACOASTMARINE VOLUME 2, NO 2, DESEMBER 2014
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

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Abstract

There many activities around marine Belawan alters the marine water quality of Belawan. The information and understanding of environmental change are indispensable in ecosystem monitoring efforts. This research aims for knowing the study of chlorophyl-a, and the relationship between physical and chemical factors was done on Desember 2013 – February 2014 in sea of Belawan, North Sumatera. The sampling was determined based on four location which is in various activities. There are 4 sampling in 3 months. The analysis of other factor, such as water temperature, pH, brightness, salinity, DO, nitrate, phosphate, and chlorophyll. The result of research showed there was a relation of physical chemical factors in sea of Belawan, North Sumatera. The range of the chlorophyll-a is 1,93 – 5,96 mg/ m3. The highest concentration of chlorophyll-a was located in floating net cages in the range of 4,06 – 5,96 mg/m3. The lowest concentration of chlorophyll-a was located in offshore in the range of 1,93 – 2,53 mg/m3. The average value chlorophyll top are on the location 4 and the lowest in the location.Keywords : Chlorophyll-a, sea of Belawan
Analisis Kualitas Air Akibat Keramba Jaring Apung Di Danau Toba Dusun Sualan Desa Sibaganding Kabupaten Simalungun Sumatera Utara Sudoyo Lumban Tobing; Ternala Alexander Barus; Desrita Desrita
AQUACOASTMARINE Vol 2, No 4 (2014): JURNAL AQUACOASTMARINE VOLUME 2, NO 4, DESEMBER 2014
Publisher : Program Studi Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Sumatera Utara

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Abstract

Sualan hamlet of Sibaganding Village is one of the territorial waters Lake Toba which used for floating nets activity. Floating nets aquaculture activities can affect the water quality Lake Toba in the hamlet of Sualan. This research aims to know the water quality based on physical and chemical parameters. Physical and chemical parameters the water analyzed by the storet method. The Research was starting from April up to May 2014. The research method used was Purposive Random Sampling. There are station I (Keramba), station II (Transition), and Station III (control). The value of physical and chemical parameters such as temperature 26,00 ºC – 28,00 ºC, turbidity (TSS) 0,89 – 5,21 mg/l, DO 5,41 – 8, 24 mg/l, pH 6,40 − 7,30, BOD 7,30 – 6,40 0,59 – 1,27 mg/l, nitrate 0,69 – 2,10 mg/l, phosphate 0,11 – 0,28 mg/l. According to physical and chemical parameters of water quality for the first station refers to third class. While on the second and the third station are refers to first class.Keywords: Water quality, Floating nets, Lake Toba
Co-Authors Abdillah Parinduri Adriana Tarigan Ahmad Muhtadi Ahmad Muhtadi Ainul Mardiah Amanda Paramitha Anggi Abdur Rohim Anita Rahman Ayu Syahfitri Daulae Bill Maulana Bidawi Bill Maulana Bidawi BUDI UTOMO Camelina Simbolon Charo Lina Kaban Darma Bakti Darma Bakti Darma Bakti Darma Bakti David Putra P Situmorang Dean Amunike Dewi Roma Widya Dewinta, Astrid Fauzia Dian Puspitasari Dian Puspitasari Dian Puspitasari Dian Puspitasari DWI SURYANTO Eka Tri Rahayu Eryana Dhalia Drajad Ginting Eryana Dhalia Drajad Ginting, Eryana Dhalia Drajad Eunike Saron Meliala Fadhilah, Amanatul Fatimah Murni Febrina Rahmadanti Putri Fina Fitriyani Ginting, Sara Silva Beru Hasan Sitorus Hesti Wahyuningsih Huria Marnis Indah L. M Tambunan Intan Iksaura Ginting Ipanna Enggar Susetya Ipanna Enggar Susetya Ipanna Enggar Susetya, Ipanna Enggar Isten Sweno Tamba Jeni Ariyanti Julia Syahriani Hasibuan Kartika Dewi Khairunnisa M Mahrozi Sagala Mars Sella Sinurat Mikha Febryana Samosir Miswar Budi Mulya Mohammad Basyuni Muammar Muammar Muhammad Mukhlis Kamal Muhammad Mukhlis Kamal, Muhammad Mukhlis Mujtahidah, Tholibah Nanda Mutia Hardianti Orbita R. Dhuha Pindi Patana Putri Permata Sari Sirait Putri Widyawati RIDWAN AFFANDI Rina D’Rita Sibagariang Rina Sari Lubis Rusdi Leidonald Ruth Aprilyanti Napitupulu Sara Silva Beru Ginting Sari Marina Saragi Sinaga, Jessica Siregar, Rizky Febriansyah Siti Aisyah Siti Aisyah Siti Aisyah Sudoyo Lumban Tobing Syammaun Usman Tarigan, Adriana Ternala Alexander Barus Toibullah Siregar Vinces Agriani Lase Vindy Rilani Manurung Yenni Ningsih Siringoringo Yenni Ningsih Siringoringo Yenni Ningsih Siringoringo, Yenni Ningsih Yessy Christanty Yuli Wulandari Yunasfi Yunasfi Djayus Yunasfi Yunasfi yunasfi yunasfi Yunasfi, Yunasfi Yunus Afifuddin Zulham Apandy Harahap