bluuebunny/crossref_metadata_2025_split huggingface dataset:
KARAKTERISTIK DAN PROSES PENGENDAPAN SEDIMEN DASAR LAUT DI PERAIRAN GOSONG BUNGA, KUALANAMU KAB. SERDANG BEDAGEI, PROV. SUMATERA UTARA
Authors: Usman Ediar , Kusnida Dida 
Published: October 2018

Daerah penelitian terletak di perairan Gosong Bunga, lepas pantai Kualanamu dengan kedalaman antara 10 â€“ 20 meter dan di bagian tengah hanya 2 - 3 meter pada saat air laut surut. Hasil analisis besar butir di daerah penelitian diperoleh beberapa jenis satuan tekstur sedimen dasar laut, yaitu: pasir lanauan, pasir, pasir lumpuran sedikit krikilan, lumpur pasiran, lanau pasiran, krikil pasiran, lumpur pasiran sedikit krikilan dan pasir sedikit krikilan. Berdasarkan hubungan antara besar butir dan persentase jumlah/frekuensi butiran; pengendapan sedimen dipengaruhi oleh arus sungai dan arus pantai dengan pola pergerakan butiran adalah saltasi, rolling (gulungan) dan sliding (dorongan) serta suspensi, dan secara umum membentuk pola saltasi. Sedangkan hasil analisis kimia pada beberapa contoh sedimen terpilih menunjukkan kandungan kuarsa (SiO2) berkisar antara 66,33 - 74,21% dan kandungan rata-rata sebesar 69,88%. Analisis fotomikro memperlihatkan komposisi utama adalah butiran kuarsa hampir 85%, mineral berat (magnetit, ilmenit, hematit dan limonit) 10% dan cangkang foram dalam keadaan utuh 5%. Hasil interpretasi rekaman seismik menujukkan ketebalan sedimen Kuarter di daerah penelitian antara 7 â€“ 15 meter, di bagian tengah mencapai 20 meter. Kata kunci: sedimen dasar laut, proses pengendapan, pola pergerakan, lepas pantai Kualanamu The survey area is located on the Gosong Bunga waters, offshore of Kualanamu coast with waters depth between 10 â€“ 20 meters, and part of central area only 2 â€“ 3 meters depth on low sea level. Grain size analysis result from the survey area is several types of seafloor sediment textures silty sand, sand, slightly gravelly muddy sand, sandy mud, sandy silt, sandy gravel, slightly gravelly sandy mud and slightly gravelly sand. Based on relation between size, and cumulative and frequency percent of grains; depositional process of sediment influenced by river and coastal current with movement pattern are saltation, rolling, sliding and suspension, and generally to form a saltation pattern. While, result of chemical analysis on some the samples indicates that the quartz content (SiO2) content are between 66,73 â€“ 74,21%, and the average content is 69,88%. Microphoto analysis indicates that the main content are quartz approximately 85%, 10% heavy minerals (magnetite, ilmenite, hematite and limonite) and good condition foram shell 5%. Seismic interpretation shows that the thickness of Quaternary sediments are about 7 to 15 meters except in the centre of the study area which is 20 meters. Keywords: seafloor sediment, depositional process, movement pattern, offshore of Kualanamu
IDENTIFIKASI ABRASI PANTAI PERAIRAN TELUK LASOLO KENDARI SULAWESI TENGGARA
Authors: Rachmat Beben , Noviadi Yogi 
Published: October 2018

Berdasarkan hasil pengamatan, abrasi pantai yang terjadi di perairan Teluk Lasolo disebabkan oleh aksi gelombang laut yang menjalar dari laut dalam disebelah timur daerah telitian ke arah perairan teluk. Aktifitas gelombang ini menyebabkan terangkutnya sedimen/batuan dari pantai ke arah laut melalui gerakan arus sejajar pantai dan arus tegak lurus pantai. Sedimen yang terangkut akan terbawa terus ke arah laut dalam oleh pergerakan arus laut yang dominan berarah tenggara. Kondisi ini menyebabkan pantai di sekitar perairan Teluk Lasolo mengalami defisit material/sedimen sehingga pantai mengalami abrasi secara kontinyu. Cara yang paling efektif untuk penanganan abrasi pantai di sekitar perairan Teluk Lasolo adalah dengan cara membuat tipe bangunan penahan pantai yang berbentuk groin sejajar dan disesuaikan dengan kondisi hidrooseanografi, morfologi dasar laut dan garis pantainya. Kata kunci : abrasi, pantai, arus, gelombang, sedimen Based on observation result, coastal abration that happened in waters of Teluk Lasolo due to action of sea wave propagating from deep sea in eastside the research area into the waters bay. This wave activity causes transporting of sedimen from coast to the sea by the longshore and rip currents movement. Transported sedimen will be brought to the deep sea by the movement of dominan south-eastern. This condition causes coastal waters around Teluk Lasolo of deficit sedimen will affected the coastal abration in continue. The most effective way to handle coastal abration around territorial waters of Teluk Lasolo is build the breakwater in form of parallel groin and according to the hydrooceanography, morphology of sea floor and coastline conditions. Keyword : abration, coastal, current, wave, sediment
VERIFIKASI LITOLOGI TERHADAP NILAI KERENTANAN MAGNETIK DI PERAIRAN BANGKA BELITUNG
Authors: Naibaho Tommy , Arifin Lukman 
Published: October 2018

Peta anomali magnetik menunjukkan bahwa perairan Bangka Belitung dicirikan oleh pasangan tinggian dan rendahan panjang gelombang anomali dengan amplitudo -200 nTâ€”500nT. Sedangkan dari peta distribusi kerentanan magnetik, tinggian magnetik Belitung dibatasi oleh nilai kerentanan magnetik antara 0,001 cgs unit dan 0,003 cgs unit. Anomali positip rendah dicirikan oleh nilai kerentanan magnetik batuan antara 0,001-0,003 cgs unit merupakan benda intrusif bawah laut yang diduga berupa pluton granitik jenis granit-biotit yang berasosiasi dengan mineral kasiterit. Pluton granitik tersebut sama seperti granit yang berafiliasi dengan endapan timah di daratan Pulau Belitung. Misalnya singkapan granit yang terdapat di sekitar pantai Gembira yang menunjukkan tipe granit biotit porfiritik dengan fenokris ortoklas. Kata Kunci: anomali magnetik, kerentanan magnetik, granit, Bangka Belitung Magnetic anomaly map shows that the Bangka Belitung waters are characterized by a pair of hight and low long-wave amplitude anomalies values of -200 nTâ€”500 nT. While the distribution map of magnetic susceptibility magnetic high of Belitung is limited magnetic susceptibility values of 0.001 cgs units and 0.003 cgs units. Positive anomaly of low magnetic is characterized susceptibility values between 0.001 to 0.003 cgs units suggested as a body of submerged intrusive rock body granitic plutons of granite biotite type associated with casiterite mineral. Granitic plutons are the same as granite affiliated with tin deposits in the mainland island of Belitung. For example there are granite outcrops around the Gembira coast that shows the type of porphyritic biotite granite with phenocrysts ortoclas. Keywords: Magnetic anomaly, magnetic susceptibility, granite, Bangka Belitung
IDENTIFIKASI PROSES TOMBOLO TANJUNG GONDOL DENGAN PERHITUNGAN ENERGI FLUX GELOMBANG DI PANTAI SINGARAJA, BALI UTARA
Authors: Astawa Nyoman , Panjaitan Saultan 
Published: October 2018

Morfologi Tanjung Gondol terdiri atas perbukitan yang cukup kontras terhadap morfologi di sekitarnya berupa pedataran. Batuan penyusun Tanjung Gondol terdiri atas batuan volkanik berupa lava, dan breksi vulkanik, yang mempunyai resistensi cukup tinggi terhadap energi gelombang laut. Daerah pedataran disusun oleh endapan aluvium yang sebagian besar berupa endapan pasir yang sangat mudah tergerus oleh energi gelombang. Tanjung Gondol adalah sebuah pulau dekat pantai yang dipisahkan dari Pulau Bali oleh sebuah selat yang sempit dengan lautnya yang dangkal. Penelitian ini bertujuan untuk mengidentifikasi proses pembentukan tombolo Tanjung Gondol berdasarkan analisis data geologi dan oseanografi. Hasil penelitian menunjukkan bahwa Tanjung Gondol sebelumnya berupa sebuah pulau kecil yang terpisah dari Pulau Bali, dan dibatasi oleh laut dangkal. Karena proses pendangkalan pada laut tersebut akibat arus sejajar pantai, maka pulau kecil ini secara berangsur bersatu dengan Pulau Bali membentuk Tombolo Tanjung Gondol. kunci : geologi, oseanografi, tombolo, Tanjung Gondol The morphology Tanjung Gondol consists of hills that fairly contrast to the surrounding morphology of plain. The lithology of Tanjung Gondol consist of volcanic rocks such plain as lava, and volcanic breccia, which has a high resistans to the sea wave energy. The plain area consist of alluvial deposits mostly of sand which are easily eroded by the sea waves. Tanjung Gondol is an island near the coast which is separated from Bali Island by the narrow strait with shallow sea. The aim of study is to identify the forming process of tombolo Tanjung Gondol based on the analyses of geological and oceanographical data. The result shows that the previous Tanjung Gondol was a small island separated from the Bali Island by a shallow sea. Due to the shallowing process in the area caused by longshore currents, this small island is then gradually connected to Bali Island forming the tombolo of Tanjung Gondol. Keywords : geology, oceanography, tombolo, Tanjung Gondol.
PROSES SEDIMENTASI DAN EROSI PENGARUHNYA TERHADAP PELABUHAN, SEPANJANG PANTAI BAGIAN BARAT DAN BAGIAN TIMUR, SELAT BALI
Authors: Setiady Deny , Gerhanae Nineu Yayu 
Published: October 2018

Pemetaan karakteristik pantai merupakan kegiatan awal untuk mengetahui daerah potensi erosi dan sedimentasi di pesisir barat dan timur Selat Bali. Faktor-faktor yang berperan dalam menganalisis proses sedimentasi dan erosi pantai, yaitu faktor litologi, gelombang dan arus. Pelabuhan di pesisir barat Selat Bali yaitu Pelabuhan Barang, Pelabuhan Pertamina (Meneng), serta Pelabuhan Fery (Ketapang), merupakan daerah sedimentasi, sedangkan pelabuhan di pesisir timur adalah Pelabuhan Penyeberangan Gilimanuk. (Bali). Kawasan pesisir Selat Bali di sisi barat batuan penyusunnya berupa batuan gunungapi muda, (lava, breksi dan tuf). Kawasan pesisir Selat Bali di sisi timur, Pulau Bali terdiri dari batugamping, konglomerat, batupasir, lava, breksi, tufa dan aluvium Pantai sebelah timur Selat Bali sebagian besar merupakan pantai berpasir (kemiringan 0o - 15o). Pantai di daerah ini merupakan daerah sedimentasi dengan lebar pantai antara 10 sampai 20 meter. Pantai barat Selat Bali dicirikan oleh pantai yang memiliki kemiringan yang landai (kemiringan 0Â° - 10Â°) dengan lebar pantai antara 3 meter sampai 15 meter merupakan daerah sedimentasi. Kata Kunci: Selat Bali, karakteristik pantai, sedimentasi, erosi Coastal characteristics mapping is an early step to know erosion and sedimentation potencies in west and east Bali Strait. Analysis factors in erosion and sedimentation potencies are lithology, current, and wave. The harbour western Bali Strait consist of Commodity Harbour, Pertamina Harbour (Meneng), and Ferry Harbour (Ketapang), was is sedimentation area, while eastern Bali Strait is Ferry Harbor (Gilimanuk). The lithology in eastern Bali Strait consists of young volcanic (lava, breccia and tuff). The lithologi in western Bali strait consists of limestone, conglomerate, sandstone, lava, breccia and tuff. In eastern Bali Strait coastal area is dominated by sandy beach (slope 5o - 20o). Coastal in this area has 10 to 20 meters wide. It is a sedimentation process area. Eastern Bali Strait area is characterized by a lower beach (slope 0o - 10o). Coastal in this area has 3 to 15 meters wide, It is a sedimentation process area. Keywords: Bali Strait, coastal characteristic, sedimentation, abration
STUDI AWAL POLA STRUKTUR BUSUR MUKA ACEH, SUMATRA BAGIAN UTARA (INDONESIA): Penafsiran dan Analisis Peta Batimetri
Authors: Permana Haryadi , Handayani L. 
Published: October 2018

Analisis morfostruktur daerah penelitian menunjukan tiga unit struktur geologi yang berbeda, antara lain zona penunjaman, zona deformasi aktif dan busur muka termasuk didalamnya tinggian busur muka dan cekungan busur muka. Struktur geologi zona penunjaman lempeng teramati sepanjang Palung Sunda paralel dengan zona deformasi aktif. Struktur geologi pada Tinggian Busur Muka membentuk sistim prisma akresi yang disusun oleh sesar anjak, sesar geser, perlipatan dan perlipatan naik. Pola kelurusan struktur umumnya berarah berarah utara baratlaut-selatan tenggara di sebelah utara lintang 5Â°U, arah baratlaut-tenggara pada posisi 3Â°-5Â°U, kelurusan kemudian berbelok hampir barat-timur di sekitar 2Â°-3Â°U. Perubahan arah pola kelurusan struktur tersebut ditafsirkan sebagai jawaban terhadap naiknya tingkat kemiringan penunjaman lempeng dari daerah Simeulue ke arah Lintang 5Â°U -7Â°U atau secara umum dari selatan Sumatra ke arah utara Sumatra. Di bagian tengah daerah telitian berkembang kelurusan patahan berarah utara-selatan yang memotong kelurusan berarah baratlaut-tenggara. Kelurusan tersebut ditafsirkan sebagai patahan geser dekstral dan kemungkinan masih aktif. Kata Kunci: Analisis morfostruktur, zona penunjaman, zona deformasi aktif, busur muka, kelurusan, sesar anjak, sesar geser, perlipatan, perlipatan naik, kemiringan penunjaman lempeng Morphostructure analyses of study area demonstrate three different units of geological structures: subduction zone, active deformation zone and fore-arc region, which include Fore Arc High and Fore Arc Basin. The plate subduction zone observes along Sunda Trench parallel with active deformation zone. Structure geology in Fore Arc High builds an accretionary prism system. It was composed by thrust fault, strike slip fault, folding and thrust fold. General trend of structural pattern is NNE-SSE at the north of 5Â°N, NW-SE direction at around 3Â°-5Â°N and changed in direction relative to E-W at about 2Â°-3Â°N. This direction variation of structural pattern trend was interpreted as a response to increase of obliquity degree of subducted plate from Simeulue area to 5Â° -7Â°N, or in general, from southern of Sumatra to north of Sumatra. NS trend lineament has developed in the middle part of study area that also sliced the NW-SE main structural direction. These structural lineaments interpreted as dextral strike slip fault and it is possibly still active. Keywords: morphostructure analyses, subduction zone, active deformation zone, fore-arc lineament, thrust fault, strike slip, folding, thrust fold, plat, plate subduction obliquity
PEMBENTUKAN UNDAK BATUGAMPING DAN HUBUNGANNYA DENGAN STRUKTUR DIAPIR DI PERAIRAN TANJUNG AWAR-AWAR PACIRAN JAWA TIMUR
Authors: Sarmili Lili , Hermansyah GM. 
Published: October 2018

Batuan yang mendominasi di daerah penyelidikan adalah batugamping koral Formasi Paciran zona Rembang. Batugamping koral inilah membentuk undak pantai di Tanjung Awar-awar dan di pantai Tuban dan sekitarnya. Terdapatnya undak batugamping ini, menandakan adanya pengangkatan secara vertikal pada satuan batuan ini. Batimetri daerah penyelidikan secara umum merupakan dataran dimana bagian yang dangkal terdapat di bagian baratdaya (ke arah pantai) dengan kedalaman 2 meter dan terdalam ke arah timurlaut dengan kedalaman 9 meter. Sebanyak 7 lintasan seismik berarah timurlaut-baratdaya dan 15 lintasan berarah barat laut â€“ tenggara telah dilakukan dan beberapa titik bor untuk memperkuat penafsiran jenis batuan di setiap lapisan penampang seismik. Struktur geologi yang ditafsirkan dari seismik pantul ini adalah adanya suatu blok batuan yang seperti tersesarkan dan terdorong ke atas sebagai struktur diapir. Struktur diapir ini berkembang sangat baik di penampang seismik ke arah barat daya atau ke arah daratan dimana di sekitar pantainya batugamping ini membentuk undak batugamping. Munculnya struktur diapir ini kemungkinannya dikarenakan bagian selatan dari zona Rembang ini terdapat suatu zona yang mempunyai anomali gaya berat negatif dan karena batugampingnya banyak terpatahkan sehingga sangat mudah diintrusi oleh sedimen yang mempunyai berat jenis kecil. Kata kunci : undak pantai, batugamping koral, struktur diapir, Tanjung Awar-Awar Jawa Timur The study area is dominated by coral reef limestone of Paciran Formation of Rembang Zone. This coral reef limestone is responsible to form the beach terraces along the Tanjung Awar-Awar and Tuban beach and its surrounded. The formation of this coral reef limestone terraces closely related to vertical movement of these rocks units. The study area is bathymetrically flat where the shallow part is on southwest (towards the beach) with 2 meters depth and the deeper part is to northeast part with 9 meters depth. There are 7 seismic reflection lines of NE-SW and 15 lines of NW-SE have been done and some rocks drilling to emphasize the seismic sequences. The interpretation of geological structure from seismic reflection shows a feature of rocks unit was faulted and intruded as diapiric structures. These features are well developed towards the beach where the terrace of coral reef limestone can be found on the beaches. The formation of these diapiric structures are interpreted where on southward of the Rembang Zone there is a gravity negative anomalies and also due to the limestone were faulted and it seems to be easy intruded by a sediment with low density. Keywords : beach terraces, coral reef limestone, diapiric structure, Tanjung Awar- Awar East Java
PENGGUNAAN METODE ANALISIS SINYAL DALAM INTERPRETASI DATA MAGNET DI PERAIRAN SELAT SUNDA UNTUK MENENTUKAN ARAH DAN POSISI PIPA BAWAH LAUT
Authors: Subarsyah Subarsyah , Nhirwana Budi 
Published: October 2018

Penentuan arah dan posisi pipa bawah laut dengan menggunakan data magnetik seringkali mengalami kesulitan dikarenakan data yang didapat tidak selalu ideal seperti yang diharapkan. Oleh karenanya diperlukan metoda yang dapat memberikan informasi posisi dan arah pipa. Analisis sinyal merupakan metoda yang akan diterapkan untuk membantu penentuan posisi dan arah pipa bawah laut. Informasi yang digunakan dalam metoda ini adalah horizontal dan vertical derivative yang erat kaitannya dengan nilai gradien anomali magnetik, sehingga data yang memiliki nilai anomali magnetik akan terlihat lebih jelas dibandingkan dengan area sekitarnya. Kata kunci : analisis sinyal, derivative. Determination of direction and position of the underwater pipeline by using magnetic data often have difficulty because the data obtained are not always ideal as expected. Therefore it is needed a method that can provide the position and also direction of underwater pipeline. Signal analysis is the method to be applied to determine the position and direction of the underwater pipeline. Information used in this methods are horizontal and vertical derivatives that closely related to the gradient of the magnetic anomalies, so that the data has a value of magnetic anomalies will be seen more clearly expose than the surrounding area. Keywords : signal analysis, derivative.
TINJAUAN ASPEK-ASPEK PEMBANGUNAN YANG MEMPENGARUHI DAMPAK LINGKUNGAN KAWASAN PESISIR DAN LAUT
Authors: Astjario Prijantono , Kusnida Dida 
Published: October 2018

Urbanisasi yang terjadi di hampir seluruh kota besar di Indonesia menambah beban daerah perkotaan menjadi lebih berat. Peningkatan jumlah penduduk selalu diikuti dengan peningkatan infrastruktur perkotaan seperti perumahan, sarana transportasi, air bersih, prasarana pendidikan, dan lain-lain. Hal tersebut di atas akan menyebabkan dorongan luar biasa terhadap pengalihfungsian lahan-lahan pertanian di kawasan pesisir, di tempat mana akan terjadi suatu situasi kritis terhadap masalah limbah. Kebutuhan akan lahan untuk permukiman maupun kegiatan perekonomian akan semakin meningkat sehingga terjadi perubahan tataguna lahan yang mengakibatkan peningkatan aliran permukaan dan limbah. Pengendalian pencemaran dan pembuangan limbah, merupakan masalah krusial dalam kawasan ini dan tindakan langsung maupun tidak langsung diperlukan untuk menciptakan pengendalian terhadap kegiatan-kegiatan yang dapat merusak lingkungan. Kata kunci : urbanisasi, infrastruktur, aliran permukaan, pencemaran dan limbah. Urbanizations that occured in nearly all of the big cities in Indonesia had burdened city areas lately. The increasing of population always comes up with the improvement of infrastructures like residential area, transportation, clean water, educational facility etc. These things may cause a stimulus and change the function of coastal farming lands and will reach a critical situation concerning the waste problem. The need of lands for settlement area and economical activity will increase and cause the change on land use and will increase the drainage and wastes. The pollution and waste dumping control are crucial problems in this area and the direct and indirect action is needed to create controls on activities that could damage the environment. Key word : urbanization, infrastructure, drainage, pollution and waste.
Exact Solution for a Black Hole Embedded in a Nonstatic Dust-filled Universe
Authors: Kopteva E. , Jalůvková P. , Bormotova I. , Stuchlík Z. 
Published: October 2018

Abstract
An exact solution of the Lemaître–Tolman–Bondi class is investigated as a possible model of the Schwarzschild-like black hole embedded in a nonstatic dust-filled universe for the three types of spatial curvature. The solution is obtained in comoving coordinates by means of the mass function method. It is shown that the central part of space contains a Schwarzschild-like black hole. The R–T structure of the resulting spacetime is built. It is shown that the solution includes both the Schwarzschild and Friedmann solutions as its natural limits. The geodesic equations for test particles are analyzed. The particle observable velocities are found. The trajectories of the test particles are built from the point of view of both comoving and distant observers. For the distant observer, the results coincide with the Schwarzschild picture within a second-order accuracy near the symmetry center.
Formation and Eruption of an Active Region Sigmoid. II. Magnetohydrodynamic Simulation of a Multistage Eruption
Authors: Jiang Chaowei , Feng Xueshang , Hu Qiang 
Published: October 2018

Abstract
Solar eruptions, mainly eruptive flares with coronal mass ejections, represent the most powerful drivers of space weather. Due to the low plasma-β nature of the solar corona, solar eruption has its roots in the evolution of the coronal magnetic field. Although various theoretical models of the eruptive magnetic evolution have been proposed, they still oversimplify the realistic process in observation, which shows a much more complex process due to the invisible complex magnetic environment. In this paper, we continue our study of a complex sigmoid eruption in solar active region 11283, which is characterized by a multipolar configuration embedding a null-point topology and a sigmoidal magnetic flux rope. Based on extreme ultraviolet observations, it has been suggested that a three-stage magnetic reconnection scenario might explain the complex flare process. Here we reproduce the complex magnetic evolution during the eruption using a data-constrained high-resolution magnetohydrodynamic (MHD) simulation. The simulation clearly demonstrates three reconnection episodes, which occurred in sequence in different locations in the corona. Through these reconnections, the initial sigmoidal flux rope breaks one of its legs, and quickly gives birth to a new tornado-like magnetic structure that is highly twisted and has multiple connections to the Sun due to the complex magnetic topology. The simulated magnetic field configuration and evolution are found to be consistent with observations of the corona loops, filaments, and flare ribbons. Our study demonstrates that significant insight into a realistic, complex eruption event can be gained by a numerical MHD simulation that is constrained or driven by observed data.