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Yona Istifarna Pasi - One of the best experts on this subject based on the ideXlab platform.
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PENENTUAN DISTRIBUSI KETEBALAN LAPISAN SEDIMEN MENGGUNAKAN MIKROTREMOR DENGAN MEtoDE QUASI TRANSFER SPECTRAL (QTS) DI KAWASAN MEUREUDU KABUPATEN PIDIE JAYA
'Fakultas Teknik Elektronika dan Komputer Universitas Kristen Satya Wacana', 2019Co-Authors: Yona Istifarna PasiAbstract:ABSTRAKAceh merupakan salah satu daerah yang dilalui oleh dua lempeng aktif yaitu Lempeng Indo-Australia dan Lempeng Eurasia. Kondisi itu menjadi penyebab sering terjadi bencana alam khususnya gempa bumi di Aceh. Pada tanggal 7 Desember 2016, terjadi gempa bumi di Kabupaten Pidie Jaya dengan kekuatan 6,5 Mw dan pada kedalaman 15 km. Kerusakan struktur bangunan akibat gempa bumi dipengaruhi oleh kondisi geologi dan kondisi tanah daerah tersebut. Daerah dengan lapisan sedimen yang tebal dapat memperkuat guncangan pada saat gempa bumi terjadi. Penelitian ini bertujuan untuk mengetahui distribusi ketebalan lapisan kawasan Kecamatan Meureudu Kabupaten Pidie Jaya berdasarkan nilai frekuensi dominan (f?) dan nilai amplifikasi (A) menggunakan mikrotremor dengan metode Quasi Transfer Spectral (QTS). Hasil penelitian menunjukkan bahwa kawasan Kecamatan Meureudu memiliki nilai frekuensi dominan 0,5-14 Hz dan nilai amplifikasi 0,6-5 kali. Nilai frekuensi dominan 0,5 sampai 4,5 Hz berada di daerah yang dekat dengan pantai dan nilai frekuensi dominan 10 sampai 14 Hz berada di daerah yang jauh dari pantai. Sedangkan nilai amplifikasi 0,6 sampai 1,8 berada di daerah yang jauh dari pantai dan nilai amplifikasi 3 sampai 4 berada di daerah yang dekat dengan pantai. Sehingga dapat dikatakan bahwa daerah yang dekat dengan pantai memiliki potensi kerusakan struktur bangunan yang lebih parah dibanding daerah yang jauh dari pantai apabila gempa bumi yang besar terjadi. Kata Kunci : Gempa bumi, mikrotremor, Quasi Transfer Spectral (QTS), frekuensi dominan, amplifikasiABSTRACTAceh is located between two active plates namely the Indo-Australian Plate and the Eurasian Plate. This is the reason why earthquake frequently happen in Aceh. An earthquake occurred in Pidie Jaya Regency with strength of 6.5 Mw and at depth of 15 km on December 7, 2016. Damage to Building structures is influenced by geological conditions and soil conditions. Areas with thick sedimentary layers can strengthen shocks during earthquake. This study aims to determine the distribution thickness of the Meureudu district of Pidie Jaya district based on the value of the dominant frequency (f?) and the amplification value (A) using a microtremor with the Quasi Transfer Spectral (QTS) method. The results showed the fact that the Meureudu District area has a dominant frequency value of 0.5-14 Hz and an amplification value of 0.6-5 times. A dominant frequency value of 0.5 to 4.5 Hz is in an area close to the coast and a dominant frequency value of 10 to 14 Hz is in an area far from the coast. While the amplification value of 0.6 to 1.8 is in an area far from the coast and the amplification value of 3 to 4 is in an area close to the coast. In conclusion, the area close the coast has the potential for Damage to Building structures which is more severe than areas far from the coast if an a large earthquake occured.Keywords: Earthquake, microtremor, Quasi Transfer Spectral (QTS), dominant frequency, amplificationBanda Ace
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PENENTUAN DISTRIBUSI KETEBALAN LPISAN SEDIMEN MENGGUNAKAN MIKROTREMOR MENGGUNAKAN MIKROTREMOR DENGAN MEtoDE QUASI TRANSFER SPECTRAL (QTS) DI KAWASAN MEUREUDU KABUPATEN PIDIE JAYA
'Fakultas Teknik Elektronika dan Komputer Universitas Kristen Satya Wacana', 2019Co-Authors: Yona Istifarna PasiAbstract:ABSTRAKAceh merupakan salah satu daerah yang dilalui oleh dua lempeng aktif yaitu Lempeng Indo-Australia dan Lempeng Eurasia. Kondisi itu menjadi penyebab sering terjadi bencana alam khususnya gempa bumi di Aceh. Pada tanggal 7 Desember 2016, terjadi gempa bumi di Kabupaten Pidie Jaya dengan kekuatan 6,5 Mw dan pada kedalaman 15 km. Kerusakan struktur bangunan akibat gempa bumi dipengaruhi oleh kondisi geologi dan kondisi tanah daerah tersebut. Daerah dengan lapisan sedimen yang tebal dapat memperkuat guncangan pada saat gempa bumi terjadi. Penelitian ini bertujuan untuk mengetahui distribusi ketebalan lapisan kawasan Kecamatan Meureudu Kabupaten Pidie Jaya berdasarkan nilai frekuensi dominan (f?) dan nilai amplifikasi (A) menggunakan mikrotremor dengan metode Quasi Transfer Spectral (QTS). Hasil penelitian menunjukkan bahwa kawasan Kecamatan Meureudu memiliki nilai frekuensi dominan 0,5-14 Hz dan nilai amplifikasi 0,6-5 kali. Nilai frekuensi dominan 0,5 sampai 4,5 Hz berada di daerah yang dekat dengan pantai dan nilai frekuensi dominan 10 sampai 14 Hz berada di daerah yang jauh dari pantai. Sedangkan nilai amplifikasi 0,6 sampai 1,8 berada di daerah yang jauh dari pantai dan nilai amplifikasi 3 sampai 4 berada di daerah yang dekat dengan pantai. Sehingga dapat dikatakan bahwa daerah yang dekat dengan pantai memiliki potensi kerusakan struktur bangunan yang lebih parah dibanding daerah yang jauh dari pantai apabila gempa bumi yang besar terjadi. Kata Kunci : Gempa bumi, mikrotremor, Quasi Transfer Spectral (QTS), frekuensi dominan, amplifikasiABSTRACTAceh is located between two active plates namely the Indo-Australian Plate and the Eurasian Plate. This is the reason why earthquake frequently happen in Aceh. An earthquake occurred in Pidie Jaya Regency with strength of 6.5 Mw and at depth of 15 km on December 7, 2016. Damage to Building structures is influenced by geological conditions and soil conditions. Areas with thick sedimentary layers can strengthen shocks during earthquake. This study aims to determine the distribution thickness of the Meureudu district of Pidie Jaya district based on the value of the dominant frequency (f?) and the amplification value (A) using a microtremor with the Quasi Transfer Spectral (QTS) method. The results showed the fact that the Meureudu District area has a dominant frequency value of 0.5-14 Hz and an amplification value of 0.6-5 times. A dominant frequency value of 0.5 to 4.5 Hz is in an area close to the coast and a dominant frequency value of 10 to 14 Hz is in an area far from the coast. While the amplification value of 0.6 to 1.8 is in an area far from the coast and the amplification value of 3 to 4 is in an area close to the coast. In conclusion, the area close the coast has the potential for Damage to Building structures which is more severe than areas far from the coast if an a large earthquake occured.Keywords: Earthquake, microtremor, Quasi Transfer Spectral (QTS), dominant frequency, amplificationBanda Ace
Carlos Rodrigueznavarro - One of the best experts on this subject based on the ideXlab platform.
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Damage mechanisms of porous materials due to in pore salt crystallization
Physical Review Letters, 2012Co-Authors: Mara Schiro, Encarnacion Ruizagudo, Carlos RodrigueznavarroAbstract:Pressure exerted by crystallization of salts within porous materials contributes to Damage in historic and modern construction. By unequivocally identifying the precipitating phase(s) while simultaneously determining solution supersaturation and associated crystallization pressure in subsurface pores, we show that the formation of a thermodynamically metastable salt phase (heptahydrate; Na2SO4·7H2O) and the resulting transition to a less soluble stable phase (mirabilite; Na2SO4·10H2O) is largely responsible for the high supersaturation and crystallization pressure developed during evaporative crystallization of sodium sulfate, the most damaging salt known. These results help to explain why salts with various (stable and metastable) hydrated phases are the most damaging. We also show that Damage associated with metastable-stable phase transitions can be suppressed by the use of crystallization promoters. These results open new ways for the prevention of salt Damage to Building materials.
Mara Schiro - One of the best experts on this subject based on the ideXlab platform.
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Damage mechanisms of porous materials due to in pore salt crystallization
Physical Review Letters, 2012Co-Authors: Mara Schiro, Encarnacion Ruizagudo, Carlos RodrigueznavarroAbstract:Pressure exerted by crystallization of salts within porous materials contributes to Damage in historic and modern construction. By unequivocally identifying the precipitating phase(s) while simultaneously determining solution supersaturation and associated crystallization pressure in subsurface pores, we show that the formation of a thermodynamically metastable salt phase (heptahydrate; Na2SO4·7H2O) and the resulting transition to a less soluble stable phase (mirabilite; Na2SO4·10H2O) is largely responsible for the high supersaturation and crystallization pressure developed during evaporative crystallization of sodium sulfate, the most damaging salt known. These results help to explain why salts with various (stable and metastable) hydrated phases are the most damaging. We also show that Damage associated with metastable-stable phase transitions can be suppressed by the use of crystallization promoters. These results open new ways for the prevention of salt Damage to Building materials.
Encarnacion Ruizagudo - One of the best experts on this subject based on the ideXlab platform.
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Damage mechanisms of porous materials due to in pore salt crystallization
Physical Review Letters, 2012Co-Authors: Mara Schiro, Encarnacion Ruizagudo, Carlos RodrigueznavarroAbstract:Pressure exerted by crystallization of salts within porous materials contributes to Damage in historic and modern construction. By unequivocally identifying the precipitating phase(s) while simultaneously determining solution supersaturation and associated crystallization pressure in subsurface pores, we show that the formation of a thermodynamically metastable salt phase (heptahydrate; Na2SO4·7H2O) and the resulting transition to a less soluble stable phase (mirabilite; Na2SO4·10H2O) is largely responsible for the high supersaturation and crystallization pressure developed during evaporative crystallization of sodium sulfate, the most damaging salt known. These results help to explain why salts with various (stable and metastable) hydrated phases are the most damaging. We also show that Damage associated with metastable-stable phase transitions can be suppressed by the use of crystallization promoters. These results open new ways for the prevention of salt Damage to Building materials.
Peter Brimblecombe - One of the best experts on this subject based on the ideXlab platform.
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Potential Damage to modern Building materials from 21st century air pollution.
TheScientificWorldJournal, 2010Co-Authors: Peter Brimblecombe, Carlota Maria GrossiAbstract:The evolution of Damage to Building materials has been estimated for the 21st century, with a particular focus on aluminum, zinc, copper, plastic, paint, and rubber in urban areas. We set idealized air pollution and climates to represent London and Prague across the period 1950-2100. Environmental parameters were used to estimate future recession, corrosion, and loss of properties through published Damage or dose-response functions. The 21st century seems to provide a less aggressive environment for stone and metals than recent times. Improvements in air quality are the most relevant drivers for this amelioration. Changes in climate predicted for the 21st century do not alter this picture. On the other hand, polymeric materials, plastic, paint, and rubber might show slightly increased rates of degradation, to some extent the result of enhanced oxidant concentrations, but also the possibility of contributions from more solar radiation.
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millennium long Damage to Building materials in london
Science of The Total Environment, 2009Co-Authors: Peter Brimblecombe, Carlota M GrossiAbstract:Damage functions from a range of sources are used to estimate deterioration of carbonate stone, iron and copper, in addition to the rate of blackening of stone surfaces in London across the period 1100-2100 CE. Meteorological and pollution input is available for only a relatively short part of this span, so non-instrumental weather records and modelled pollution are utilised for historic values, while future climate is adapted from the HadCM3A2 model output and pollution assessed from likely regulatory trends. The results from the different Damage functions compare reasonably well showing comparable changes in Damage rates with time. A potential square-root dependence of change in deposition velocity of SO2 to limestone suggests a possible overestimate of Damage when pollution is high. Deterioration is especially intense from the 1700s. It is difficult to be certain whether the corrosion of copper accelerated as early as this or it developed in the 20th century. Nevertheless all the functions predict a decline in copper corrosion from the end of the 20th century. A blackening function was developed to relate elemental carbon concentration and the colour of deposited particulate matter to blackening rate, which suggests that soiling was particularly rapid in the late 19th century. The increase and subsequent decrease in Damage to Building materials is interpreted in terms of a Kuznets curve. The centuries where pollution controlled Damage to durable Building material seems to be over. Weathering, in a changing climate may have the greatest impact in the future.
