Relevant bibliographies by topics / Resistività

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Academic literature on the topic 'Resistività'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 March 2023

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Journal articles on the topic "Resistività"

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Carlucci, Claudia, Maria Anna De Lucia Brolli, Simon Keay, Martin Millett, and Kristian Strutt. "An archaeological survey of the Faliscan settlement at Vignale, Falerii Veteres (province of Viterbo)." Papers of the British School at Rome 75 (November 2007): 39–121. http://dx.doi.org/10.1017/s0068246200003524.

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UNA RICOGNIZIONE ARCHEOLOGICA DELL'INSEDIAMENTO FALISCO A VIGNALE, FALERII VETERES (PROVINCIA DI VITERBO)L'articolo presenta i risultati di una ricognizione geofisica condotta a Vignale nel 2001–2 come parte del ‘Progetto città romane nella media e bassa valle del Tevere’. Il sito costituisce una parte importante dell'insediamento topograficamente complesso di Falerii Veteres (moderna Civita Castellana) nella provincia di Viterbo. Il sito ebbe una lunga e complessa occupazione che si estese dall'età del bronzo al basso medioevo, benché il suo principale periodo di vita sia stato l'età del ferro.Le caratteristiche di questo sito particolare necessitavano di una ricognizione topografica dettagliata, associata all'uso della magnetometria, della resistività e di un programma di campionatura geochimica. I risultati di simili approcci hanno gettato nuova luce sull'organizzazione spaziale del pianoro di Vignale. Inoltre, i dati sono stati integrati con quelli raccolti in passato sulla stessa Vignale da Raniero Mengarelli tra il 1895 e il gennaio del 1896. Le evidenze emerse, insieme al riesame delle terrecotte raccolte sul sito, suggeriscono che a Vignale si trovasse uno dei santuari falisci principali di Falerii Veteres e che esso si sia sviluppato tra il V e il III secolo a.C.
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Nengga, Leonardus, Hery L. Sianturi, and Redi K. Pingak. "PENDUGAAN JENIS PERLAPISAN BATUAN DENGAN METODE GEOLISTRIK RESISTIVITAS PADA WILAYAH LONGSORAN DESA TOLNAKU KABUPATEN KUPANG." Jurnal Fisika : Fisika Sains dan Aplikasinya 3, no. 2 (December 17, 2018): 91–96. http://dx.doi.org/10.35508/fisa.v3i2.607.

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Abstrak Telah dilakukan penelitian tentang pendugaan jenis perlapisan batuan pada wilayah longsoran Desa Tolnaku, Kecamatan Fatuleu, Kabupaten Kupang. Penelitian ini bertujuan untuk mengidentifikasi jenis perlapisan batuan dan memperkirakan kedalaman setiap perlapisan batuan bawah permukaan di sekitar wilayah longsoran tersebut. Pengambilan data dilakukan menggunakan metode geolistrik resistivitas konfigurasi Schlumberger dan analisis data penelitian menggunakan software Res2Dinv untuk mendapatkan nilai resistivitas sebenarnya. Berdasarkan hasil penelitian, jenis batuan di lokasi penelitian terdiri atas batuan lempung (clay) dengan nilai resistivitas 1,1 – 27,60 pada kedalaman 5 – 105 m, batuan alluvium dengan nilai resistivitas 10,0 – 79,4 pada kedalaman 5 – 105 m, dan gamping (limestone) dengan nilai resistivitas 50,0 – 1.817 pada kedalaman 27 – 105 m. Kata Kunci: Geolistrik Resistivitas, Schlumberger, Res2Dinv Abstract A study on the estimation of underground rock petterns in Tolnaku village Kupang Regency has been conducted. The study aims to identify types of rock layers and to estimate the deph of each layer. Data was taken using geoelectricity method with Schlumberger configurasi while the data analysis was performed using Res2Dinv to obtain the real resistivity value. From the results, rocks foud in the research location are clay with resistivity being 1.1 – 27.6 (between 5 – 105 m), alluvium with resistivity being 10.0 – 79.4 (between 5 – 105 m), and limestone with resistivity being 50.0 - 1.817 (between 25–105 m). Key words: Geoelectric resistivity, Schlimberger, Res2Dinv.
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Amir, Amir, Jahidin Jahidin, and Al Rubaiyn. "APLIKASI METODE RESISTIVITAS KONFIGURASI WENNER SCHLUMBERGER UNTUK ANALISA KETERDAPATAN BATU GAMPING DI BAWAH PERMUKAAN PADA BLOK A AREA PENAMBANGAN PT. ANSAF INTI RESOURCES DESA TONDOWATU, KABUPATEN KONAWE UTARA." Jurnal Rekayasa Geofisika Indonesia 4, no. 02 (August 30, 2022): 105. http://dx.doi.org/10.56099/jrgi.v4i02.27517.

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Penelitian geolistrik resistivitas untuk menentukan sebaran keterdapatan batu gamping di bawah permukaan pada blok A di area penambangan PT. Ansaf inti Resources Desa Tondowatu Kabupaten Konawe Utara telah dilakukan menggunakan konfigurasi Wenner – Schlumberger (WS). Pengambilan data dilakukan sebanyak enam lintasan dengan Panjang masing-masing lintasan berbeda beda. Lintasan pertama 300 m, lintasan kedua, ketiga, keempat 310 m dan lintasan kelima 250 serta lintasan ke enam 200 m. Data yang telah diperoleh di lapangan selanjutnya diolah dengan menggunakan software Res2dinv dan menghasilkan berupa penampang Dua dimensi (2D) yang mempresentasikan sebaran keterdapatan batugamping di bawah permukaan. Nilai resistivitas diarea penelitian yaitu 7,08 – 6819 Ωm dengan struktur lapisan bawah permukaan terdiri dari 3 zona lapisan yaitu lapisan dengan nilai resistivitas rendah terdiri dari lapisan soil, lapisan dengan nilai resistivitas sedang terdiri dari lapisan batu pasir dan lapisan dengan nilai resisitivitas tinggi terdiri dari lapisan batu gamping. Sebaran keterdapatan batu gamping diarea penelitian pada lintasan 1, 2, dan 3 cenderung menyebar ke arah barat laut dengan ketebalan 10 meter dan kedalaman mencapai 1,25 - 50 m dari atas menuju bawah permukaan dengan nilai resistivitas pada lintasan 1 yaitu sebesar 14,2 – 6819 Ωm, lintasan 2 dengan nilai resistivitas 17,1- 2214 Ωm untuk lintasan 3 dengan nilai resistivitas yaitu 11,3 – 660 Ωm sedangkan untuk lintasan 4, 5, dan 6 cenderung menyebar kearah timur laut dengan ketebalan 10 meter dan kedalaman 1,25 – 50 meter dari atas menuju bawah permukaan, dengan nilai resistivitas untuk lintasan 4 yaitu 8,66 – 786 Ωm, lintasan 5 dengan nilai resistivitas sebesar 7,08 – 863 Ωm dan nilai resistivitas untuk lintasan 6 yaitu 7,51- 8,11 Ωm Kata Kunci: Analisa, keterdapatan, Batugamping, Resistivitas 2D, Wenner Schlumberger, Tondowatu. Abstract Geoelectric resistivity research to determine the distribution of subsurface limestone in block A in the mining area of PT. Ansaf core Resources Tondowatu Village, North Konawe Regency has been carried out using the Wenner – Schlumberger (WS) configuration. Data retrieval was carried out as many as six paths with the length of each path being different. The first track is 300 m, the second, third, fourth track is 310 m and the fifth track is 250 and the sixth track is 200 m. The data that has been obtained in the field is then processed using the Res2dinv software and produces a two-dimensional (2D) cross-section that represents the distribution of limestones below the surface. The resistivity value in the research area is 7.08 – 6819 Ωm with a subsurface structure consisting of 3 layer zones, namely a layer with a low resistivity value consisting of a soil layer, a layer with a medium resistivity value consisting of a sandstone layer and a layer with a high resistivity value consisting of limestone layers. The distribution of limestone in the study area on paths 1, 2, and 3 tends to spread to the northwest with a thickness of 10 meters and a depth of 1.25 – 50 Ωm from above to below the surface with a resistivity value on track 1 which is 14.2 - 6819 Ωm, track 2 with a resistivity value of 17.1-2214 Ωm for track 3 with a resistivity value of 11.3 – 660 Ωm while for lines 4, 5, and 6 tend to spread towards the northeast with a thickness of 10 meters and a depth of 1.25 – 50 meters from above to below the surface, with a resistivity value for track 4 which is 8.66 – 786 Ωm, line 5 with a resistivity value of 7.08 – 863 Ωm and the resistivity value for track 6 is 7.51-8.11 Ωm Keywords: Analysis, presence, Limestone, 2D Resistivity, Wenner Schlumberger, Tondowatu
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Husain, Mirna, As’ari _, and Seni H. J. Tongkukut. "Pemetaan Aair Tanah Menggunakan Metode Geolistrik Tahanan Jenis Konfigurasi Dipol-dipol Di Universitas Sam Ratulangi." Jurnal MIPA 6, no. 1 (June 19, 2017): 78. http://dx.doi.org/10.35799/jm.6.1.2017.16175.

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Telah dilakukan penelitian untuk mendeteksi keberadaan air tanah di area Universitas Sam Ratulangi. Penelitian ini menggunakan metode geolistrik resistivitas tahanan jenis konfigurasi Dipol-dipol. Akuisisi data menggunakan Multichannel and Multielectrode resistivity an IP meter 48 simultaneous channel merek MAE X 612-EM. Pengukuran dilakukan pada 11 lintasan dengan panjang masing-masing lintasan 480 meter. Pengolahan data dilakukan dengan menggunakan perangkat lunak Res2Dinv dengan hasil berupa gambar tampang lintang resistivitas model bawah permukaan 2D yang digunakan untuk menentukan posisi akuifer air tanah.Hasil menunujukkan bahwa adanya lapisan batuan dengan nilai resistivitas rendah yaitu 280 Ωm. Nilai resistivitas yang merupakan lapisan pembawa air adalah 25,93 Ωm. Posisi akuifer diperoleh pada lintasan 1, 3, 5, 7, 8 dan 9.of Sam Ratulangi area.The research used the dipole-dipole configuration resistivity geoelectic method. Data acquisitions is using Multichannel and Multielectrode resistivity an IP meter 48 simultaneous channel of MAE X 612-EM types. The measurement is done on 11 lines with length of each line is 480 meters. Data processing has been done by using Res2Dinv software and resulted of 2D resistivity subsurface model which used to determine the groundwater aquifer position.The results show that the existence of rock layer with low resistivity is 280 Ωm. The resistivity of rock layer of the water aquifer is 25,93 Ωm. Position of aquifer are obtained in the 1,3,5,7,8, and 9 lines.
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Kadri, Muhammad, and Teguh Febri Sudarma. "Penentuan Struktur Bawah Permukaan Daerah Geothermal Menggunakan Metode Geolistrik di Desa Penen Kecamatan Biru Biru Kabupaten Deli Serdang." Tunas Geografi 8, no. 1 (November 29, 2019): 1. http://dx.doi.org/10.24114/tgeo.v8i1.13914.

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Abtract This study aimed to study the distribution of fluids, anomaly sightings and subsurface models from geothermal areas discussed in Penen village. Blue Biru District Deli Serdang Regency. The measurement of the geoelectric method is done by making the electrode path that injects current through the electrode. The potential difference that arises in the resistivity ABEM gauge can be measured by the apparent resistivity value obtained from the geoelectric device. Then the data is processed using Res2Div to get a 2D cross-section of the resistivity value of the rock layer. The analysis shows that the resistivity value (0.00-100) ohm-m and the throw layer model. Resistivity value (150-200) ohm-m model of the siltstone layer. The resistivity value (350-500) model of the sand layer ohm-m, and the resistivity value> 2250 ohm-m which identifies the limestone layer. From the results of this study, it can be concluded that Penen Village, Biru Biru Sub-District, Deli Serdang Regency supports having geothermal energy.Keywords: Geoelectric, GPS, Susceptibility, Resistivity, Geothermal AbstrakTujuan dari penelitian ini adalah untuk mengetahui penyebaran fluida, penampang anomali dan model lapisan bawah permukaan dari daerah berpotensi geothermal tepatnya di desa Penen. Kecamatan Biru Biru Kabupaten Deli Serdang. Pengukuran metode geolistrik dilakukan dengan membuat lintasan elektroda yang menginjeksi arus melalui elektroda. Beda potensial yang muncul pada alat pengukur ABEM resistivity dapat terukur sehingga didapat harga resistivitas semu yang diperoleh dari alat geolistrik. Kemudian data diolah menggunakan Res2Div untuk mendapatkan penampang kontur 2D dari nilai resistivitas lapisan batuan. Hasil analisis menunjukkan bahwa nilai resistivitas (0,00-100) ohm-m dan model lapisan batuan lempung. Nilai resistivitas (150-200) ohm-m model lapisan batuan lanau. Nilai restivitas (350 - 500) ohm-m model lapisan pasir, dan nilai restivitas >2250 ohm-m yang mengidentifikasikan lapisan batu gamping. Dari hasil penelitian ini dapat disimpulkan bahwa daerah Desa Penen Kecamatan Biru Biru Kabupaten Deli Serdang berpotensi memiliki energi panas bumi. Kata kunci: Geolistrik, GPS, Suseptibilitas, Resistivity, Geothermal
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Marwanta, Bambang. "ANALISIS DATA RESISTIVITY UNTUK MENENTUKAN POTENSI BENCANA TANAH LONGSOR DI KAMPUNG LEGOK HAYAM DESA GIRIMEKAR KECAMATAN CILENGKRANG KABUPATEN BANDUNG." Jurnal Alami : Jurnal Teknologi Reduksi Risiko Bencana 1, no. 1 (February 1, 2017): 11. http://dx.doi.org/10.29122/alami.v1i1.121.

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ABSTRAKDesa Girimekar Kecamatan Cilengkrang kabupaten Bandung merupakan wilayah yang rawan longsor. Wilayah ini mempunyai ketinggian 800 mdpl ini merupakan morfologi perbukitan dengan kelerengan 10º hingga 40º. Longsor di daerah tersebut sering terjadi pada waktu musim hujan. Untuk mengetahui diketahui profil bawah permukaan yang menjadi penyebab terjadinya gerakan tanah di wilayah tersebut, dilakukan investigasi dengan menggunakan pengukuran dengan resistivitymeter. Data resistivitas diolah dengan menggunakan RES2DINV (2D Resistivity Inversion) dan dimodelkan dalam profil bawah permukaan yang menggambarkan 2D lapisan permukaan tanah atau batuan dengan nilai resistivitas yang berbeda. Pengukuran resistivity dilakukan pada 7 line pada lokasi yang mana sudah terjadi gerakan tanah. Dari hasil interpretasi data pemodelan maka diketahui pola perlapisan batuan di daerah telitian, dengan arah gerakan tanah menuju ke arah barat. Batas lapisan lapuk dengan bidang gelincir relatif dalam, yaitu sekitar 20 meter. Lapisan lapuk diinterpretasikan dengan batuan pasir tufaan dan endapan gunung api terlapukkan, dengan resistivitas 10 – 20 ohm meter. Sedangkan bidang gelincirnya merupakan lempungan dengan resistivitas 100 – 200 ohm meter. Untuk memastikan jenis batuan yang tergambar dalam profil resistivity tersebut perlu dilakukan data pemboran atau interpretasi dari data geologi yang tersingkap di sekitar lokasi telitian. Kata kunci: Potensi Longsor, Girimekar, Resistivity, 2D
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Boimau, Yanti, and Anastasia Kadek Dety Lestari. "Identifikasi Air Tanah di Daerah Pesisir Pantai Kolbano." Jurnal Fisika Unand 10, no. 2 (April 6, 2021): 262–66. http://dx.doi.org/10.25077/jfu.10.2.262-266.2021.

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Telah dilakukan penelitian identifikasi air tanah di wilayah pesisir Kolbano yang bertujuan untuk mengetahui dan menentukan kedalaman air tanah di lokasi penelitian. Metode yang digunakan adalah metode geolistrik dengan konfigurasi Schlumberger. Data yang diperoleh di lokasi penelitian diolah menggunakan software Res2dinv untuk mendapatkan nilai resistivitas batuan di lapangan. Hasil inversi menunjukkan nilai resistivitas batuan terukur pada 3 lintasan yaitu 17,1-27,626 Ωm. Berdasarkan nilai resistivitas yang diperoleh, diasumsikan terdapat 3 jenis lapisan batuan di lapangan, yaitu lempung dengan resistivitas (10-100) Ωm dan aluvium dengan resistivitas (101–800 Ωm) dan batugamping (101–27.626 Ωm). Potensi batuan sebagai batuan akuifer adalah alluvium. Air tanah yang tersimpan di batuan aluvium terletak pada kedalaman (12-20 m). Research on groundwater identification in the coastal area of Kolbano has been carried out, which aims to determine and determine the depth of groundwater at the research location. The method used is the geoelectric method with a Schlumberger configuration. The data obtained at the research location were processed using res2dinv software to obtain the rock resistivity value in the field. The inversion results show the measured rock resistivity value on 3 measurement line, namely 17.1-27.626 Ωm Based on the resistivity value obtained, it is assumed that there are 3 types of rock layers in the field, consisting of clay with resistivity (10-100 Ωm) and alluvium with resistivity (101-800 Ωm) and limestone (101-27.626Ωm). Rocks Potential as aquifer rocks is alluvium. Groundwater stored in alluvium rocks lies at a depth (12-20 m).
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Rahayu, Debby, Agung Hasan, Nurita Dwi Puspitasari, and Muhammad Fawzy Ismullah Massinai. "PENDUGAAN BAWAH PERMUKAAN FORMASI WALANNAE MENGGUNAKAN METODE RESISTIVITAS." JURNAL GEOCELEBES 3, no. 2 (October 31, 2019): 83. http://dx.doi.org/10.20956/geocelebes.v3i2.7490.

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Penyelidikan mengenai bawah permukaan semakin digalakkan demi menjamin pembangunan yang berkelanjutan di permukaan tanah. Pembangunan intensif dilaksanakan di Desa Bira, Kecamatan Bontobahari, Kabupaten Bulukumba, yang merupakan salah satu daerah andalan pariwisata di Sulawesi Selatan. Oleh karena itu, studi identifikasi kondisi bawah permukaan semestinya sedini mungkin dilaksanakan. Penyelidikan ini bertujuan untuk menentukan jenis dan sebaran lapisan bawah permukaan menggunakan metode geolistrik resistivitas secara sederhana sebagai data awal penyelidikan berikutnya yang lebih terperinci. Metoda ini menggunakan prinsip aliran arus listrik yang mengalir di dalam tanah melalui batuan–batuan. Pada penelitian geolistrik resistivitas ini menggunakan konfigurasi Wenner - Schlumberger. Pada penelitian ini terdapat sebuah lintasan pengukuran resistivitas mapping dengan jumlah elektroda sebanyak 30 dan spasi tiap elektroda 5 m. Hasil yang didapatkan berupa penampang resistivitas yang memperlihatkan adanya 3 lapisan yaitu low resistivity (< 6,44 Ωm), medium resistivity (16,6 – 285 Ωm) dan high resistivity 285 – 1892 Ωm. Lapisan ini berturut turut diduga merupakan lapisan lempung-pasir yang memungkinkan mengandung air tanah/ Ground water, lapisan alluvium dan lapisan batugamping terumbu.
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Simamora, Selvy Tiurma, Sri Cahyo Wahyono, and Simon Sadok Siregar. "Identifikasi Batuan Andesit Menggunakan Metode Geolistrik 2D di Daerah Pengaron, Kalimantan Selatan." Jurnal Fisika Unand 9, no. 4 (January 25, 2021): 487–94. http://dx.doi.org/10.25077/jfu.9.4.487-494.2020.

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Telah dilakukan penelitian untuk mengidentifikasi lapisan batuan andesit menggunakan metode geolistrik 2D dengan konfigurasi Schlumberger di daerah Pengaron, Kalimantan Selatan. Pengukuran dilakukan untuk lima lintasan dengan panjang tiap lintasan 270 m. Tujuan dari penelitian ini adalah memodelkan penampang lintang nilai resistivitas 2D, menentukan jenis litologi, kedalaman dan ketebalan batuan andesit di daerah penelitian. Berdasarkan hasil pengolahan data diperoleh tiga lapis jenis batuan. Lapisan pertama merupakan lapisan top soil dengan nilai resistivitas 39–116 Ωm, lapisan kedua adalah lempung dengan nilai resistivitas 143–298 Ωm dan lapisan ketiga merupakan batuan andesit dengan nilai resistivitas 320–1.000 Ωm. Hasil interpretasi 2D menunjukkan bahwa batuan andesit memiliki nilai resistivitas 382–1.000 Ωm pada kedalaman 10-77 m dan ketebalan 10–55 m. Research has been carried out to identify andesite rock layers using 2D geo-electrical method with Schlumberger configuration in the Pengaron area, South Kalimantan. Measurements were made for five tracks with a length of each track being 270 m. The purpose of this research is to model the cross section of 2D resistivity values, determine the type of lithology, depth and thickness of andesite rocks in the study area. Based on the results of data processing, three layers of rock types were obtained. The first layer is the top soil layer with a resistivity value of 39–116 Ωm, the second layer is clay with a resistivity value of 143–298 Ωm and the third layer is andesite rock with a resistivity value of 320–1,000 Ωm. The 2D interpretation results show that andesite rocks have a resistivity value of 382–1,000 Ωm at a depth of 10-77 m and a thickness of 10–55 m.
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Dien, Ilham Nur, Sulistyani Sulistyani, Anas Handaru, Dewi Sri Sayudi, and Agus Budi Santoso. "Interpretasi Bawah Permukaan Gunung Merapi dengan Metode Magnetotellurik." Jurnal Lingkungan dan Bencana Geologi 11, no. 3 (December 24, 2020): 143. http://dx.doi.org/10.34126/jlbg.v11i3.225.

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ABSTRAKSurvei magnetotellurik (MT) telah dilakukan di Gunung Merapi dengan menggunakan alat Phoenix Geophysics MTU5 pada Oktober 2016 dan Mei 2017. Pengukuran dilakukan dengan jarak tiap titik sekitar 1 km, durasi pengukuran untuk satu titik ±12 jam, dan lebar dipole 50 s/d 80 meter utara-selatan dan timur barat. Sebanyak 8 titik sounding digunakan untuk menyusun profil resistivitas 2-D di lereng utara dan selatan. Hasil menunjukkan bahwa resistivitas bawah permukaan Merapi terdiri dari 2 (dua) karakteristik nilai resistivitas yaitu zona resistivitas tinggi dengan nilai 183-50.000 ohm.m dan zona resistivitas rendah dengan nilai 20-175 ohm.m. Zona resistivitas tinggi dapat diinterpretasikan sebagai zona produk erupsi sebelumnya yaitu aliran lava dan material piroklastik lainnya. Sedangkan zona resistivitas rendah diinterpretasikan sebagai kantong magma terbagi menjadi dua bagian, bagian atas berada pada kedalaman 0 s/d 2.000 meter dengan diameter mencapai 1.000 meter yang mengindikasikan sebuah kantong magma dangkal, sedangkan bagian bawah terlihat menerus dari kedalaman 3.000 s/d 11.000 meter sebagai kenampakan dapur magma yang cukup besar dengan diameter rata-rata sekitar 2.000 meter yang diindikasikan sebagai kantong magma dalam. Hasil zonasi ini senada dengan posisi hiposenter dari kejadian gempa vulkanik periode tahun 2010. Selain itu, terlihat adanya struktur yang diindikasikan sebagai sesar yang memotong lintasan di sekitar puncak.Kata kunci: Gunung Merapi, kantong magma, magnetotellurik, resistivitasABSTRACTMagnetotelluric (MT) survey has been carried out on Phoenix Geophysics MTU-5 in October 2016 and May 2017. The measurement has been done with the distance between them approximately 1 km, its duration of each sounding was 12 hours, and dipole length varied from 50-80 meters on North-South and East-West direction. Here we use the result from 8 MT sounding to construct a 2-D electrical resistivity image of the northern and southern flank of Merapi. The results show that the subsurface resistivity in Merapi consists of two types of resistivity features, i.e. the high resistivity zone which having resistivity value 183-50.000 ohm.m and the low one which varied from 20-175 ohm.m. The high resistivity zone are the lava flow and another pyroclastic material, while the low resistivity zone interpreted as magma chamber divided into two parts: upper part, at a depth of 0-2,000 meters with 1,000 meters diameter which is indicated as a shallow magma chamber, lower part, continuously from the depth of 3,000-11,000 meters as the large magma chamber with an average diameter of about 2,000 meters. The zone can be correlated to the hypocenter position taken from the volcanic earthquake event of 2010 period. In addition, there is a structure which indicated as a fault that cuts the trajectory around the summit. Keywords: Merapi Volcano, magma chamber, magnetotelluric, resistivity
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Dissertations / Theses on the topic "Resistività"

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Stenghel, Alessandro. "Simulazioni numeriche di onde di Alfvén in presenza di resistività." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21065/.

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In questo lavoro di tesi studieremo, con l’ausilio di simulazioni numeriche, le proprietà delle così dette onde di Alfvén in un magnetofluido ideale (ossia con resistività nulla) e non ideale (ossia in presenza di resistività). Dopo aver introdotto il lettore alle principali equazioni della magnetoidrodinamica, elaborando queste equazioni vedremo come in condizioni ideali (ossia senza resistività) in un plasma nel quale il campo magnetico è uniforme si possano generare delle onde trasversali che si propagano lungo la direzione del campo, le onde di Alfvén. Analizzeremo poi la stessa configurazione in presenza di resistività, la quale avrà come effetto principale uno smorzamento esponenziale dell'ampiezza dell'onda. Infine, effettueremo delle simulazioni numeriche di entrambe queste configurazioni con il codice magnetoidrodinamico Arepo e confronteremo i risultati ottenuti con le previsioni analitiche mostrando il buon accordo tra le simulazioni eseguite e la teoria.
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BOTTACCHI, Marta Caterina. "Studio dell’efficacia dell’OhmMapper (Geometrics Inc.) per indagini geoelettriche in contesti archeologici." Doctoral thesis, Università degli studi di Ferrara, 2010. http://hdl.handle.net/11392/2389294.

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The research project carried out during the PhD work aims to study the effectiveness of the OhmMapper (Geometrics Inc.) capacitive-coupled resistivity system in archaeological contexts. In order to verify the effectiveness of this resistivity-meter to identify archaeological features, we realized a systematic surveys in the Geophysical Test Site of Rovereto (TN - Italy). In particular we compared both resistance and resistivity profiles realized by OhmMapper capacitively coupled resistivity-meter and by the Terrameter SAS 1000 (ABEM) galvanic resistivity meter. We realized these surveys walking along the same acquisition line to intercept a target compatible with an archaeological feature. The comparison between the profile realized by the two different instruments allowed us to establish the reliability of the OhmMapper to detect targets characterized by vertical pattern and resistivity values grater than the context. After this analysis, we realized several resistivity surveys in archaeological sites using the OhmMapper. In particular the surveys carried out in five archaeological sites are the most appropriate to demonstrate the effectiveness of the instrument, because the resistivity results are comparable with other archaeological or geophysical data. Two of these sites are located in modern urban contexts (Sacred Area of Medma Greek colony and the roman Aqueduct of Florence); the other three sites are located in suburban areas (Late-ancient villa near Siena, Accademia of Villa Adriana and Sentinum roman town).
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3

Giammaria, Tommaso. "Realization of a four-probe electrical resistivity apparatus and its noise-reduced data acquisition interface to characterize superconducting materials." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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L’elaborato si basa sulla realizzazione di un sistema di rilevazione sincrona per misure di resistenza elettrica con metodo a quattro terminali. L’obbiettivo, utile alla caratterizzazione di materiali superconduttivi, è quello di misurare la dipendenza tra resistività elettrica e temperatura del campione. L’apparato si suddivide in un sistema di controllo della temperatura e un sistema di acquisizione dotato di amplificatore lock-in digitale. Gli amplificatori lock-in sono strumenti usati per il recupero di segnali laddove il contributo del rumore di fondo risulta essere preponderante rispetto al segnale d’interesse. L’acquisizione e conversione del segnale analogico viene svolta da una scheda Digilent Analog Discovery 2, il segnale digitalizzato viene elaborato da un amplificatore lock-in digitale. Quest’ultimo è stato sviluppato ad hoc in ambiente labVIEW, ricoprendo un ruolo fondamentale nel lavoro presentato. Il sistema di controllo della temperatura comprende un impianto criogenico e un sistema di riscaldamento (con circuito di retroazione PID). I test svolti per definire le performance del sistema di acquisizione hanno rivelato una riserva dinamica stimata di 82 dB ed un segnale minimo misurabile di 200 nV (con un errore del 5%). Successivamente l’apparato è stato utilizzato per caratterizzare due campioni superconduttori appartenenti rispettivamente alla famiglia dei cuprati e a quella dei ferro-pnictidi. L’apparato è in grado di misurare valori di resistenza con una sensibilità di 200 nV/I (dipende dalla corrente fornita al campione e misurata in Ampere), realizzando un grafico di dipendenza R vs T con 0,05 K di risoluzione. Le temperature critiche misurate per i due campioni sono in accordo con i valori trovati in letteratura. Il lock-in illustrato in questa tesi presenta possibili applicazioni a scopo educativo o di ricerca, qualora le performance richieste per la misura rientrino in quelle descritte precedentemente.
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Spinoso, Melissa. "Studio dei processi di dissoluzione nei reattori agitati con alta concentrazione di solido." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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In questo lavoro di tesi si focalizza l’attenzione sullo studio dei fenomeni di dissoluzione nei reattori operanti con miscele bifase solido-liquido meccanicamente agitati, in quanto, queste operazioni sono di largo interesse in campo industriale. La necessità di garantire un’adeguata miscelazione all’interno dei reattori, in cui avvengono reazioni chimiche o dove si verificano scambi di calore e materia, deriva non solo da ragioni economiche, ma anche da aspetti relativi alla sicurezza negli impianti, dato che risulta difficile conoscere il comportamento delle miscele bifase in ogni zona del reattore. Per seguire dunque l’evoluzione dinamica dei processi ci si è serviti della tomografia elettrica di resistività (ERT) che consente di ricostruire la distribuzione spaziale delle proprietà elettriche del sistema che si sta studiando. Questa apparecchiatura, in maniera non invasiva, consente di valutare, tramite misure di conducibilità elettrica, la concentrazione del prodotto solubile nel tempo all’interno di un reattore agitato. Sono state, inoltre, effettuate misure di distribuzione di solido al variare della velocità di rotazione della girante, per le due differenti classi granulometriche delle particelle utilizzate, in quanto la presenza del solido inerte svolge un’azione di disturbo nei confronti dei fenomeni di dissoluzione. Premesso ciò, sono state dunque condotte numerose prove sperimentali di dissoluzione di cloruro di sodio di tre tagli granulometrici diversi al variare del numero di giri di ciascuna delle due giranti prescelte, ovvero una PBT e una A310. Le prove sono state finalizzate alla valutazione dei tempi di dissoluzione del sale. La ricerca condotta ha permesso di caratterizzare i fenomeni di scambio di materia nei reattori bifase operanti con miscele solido-liquido, in cui è presente un’elevata concentrazione di solido, proponendo un’interpretazione fenomenologica semplificata del processo di dissoluzione.
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Amaini, Chiara. "Indagini di tomografia geoelettrica sulle dune costiere della Provincia di Ravenna." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8440/.

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Questa tesi Magistrale è frutto di un'attività di ricerca, che consiste nella realizzazione di un'indagine geofisica di tipo geoelettrico (ERT Electrical Resistivity Tomography). Lo scopo è quello di caratterizzare l'idrogeologia di una porzione limitata dell'acquifero freatico costiero ravennate, situato nella Pineta Ramazzotti di Lido di Dante, cercando di apportare nuove conoscenze sulle dinamiche che favoriscono l'ingressione marina (problema di forte attualità)che potrebbero contribuire a migliorare la gestione e la tutela delle risorse idriche. In questo contesto la tesi si pone come obiettivo quello di valutare l'applicabilità del metodo geoelettrico verificando se questo è in grado d'individuare efficacemente l'interfaccia acqua dolce-salata e le strutture presenti nel sottosuolo, in due tipologie di ambiente, con e senza un sistema di dune. I risultati dimostrano che dal punto di vista scientifico, il metodo geoelettrico ha verificato il principio di Ghyben-Herzberg, il quale suppone che vi sia una relazione inversa tra quota topografica e limite superiore della zona satura con acqua salata, inoltre si è riscontrata una certa stagionalità tra i profili acquisiti in momenti diversi (influenzati dalla piovosità). Mentre dal punto di vista tecnologico, il metodo, è di difficile utilizzo negli ambienti di transizione tanto ché chi si occupa professionalmente di questi rilievi preferisce non eseguirli. Questo è dovuto alla mancanza di un protocollo per le operazioni di acquisizione e a causa dell'elevato rumore di fondo che si riscontra nelle misurazioni. Con questo studio è stato possibile calibrare e sviluppare un protocollo, utilizzabile con diverse spaziature tra gli elettrodi, che è valido per l'area di studio indagata. Si è riscontrato anche che l'utilizzo congiunto delle informazioni delle prospezioni e quelle dei rilievi classici (monitoraggio della superficie freatica, parametri chimico-fisici delle acque sotterranee, rilievo topografico e sondaggi geognostici), generino un prodotto finale di semplice interpretazione e di facile comprensione per le dinamiche in atto.
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Signora, Alessandro. "Monitoraggio geoelettrico time lapse di lungo periodo come strumento di indagine e di incremento del rendimento energetico di una discarica." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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Nel lavoro in oggetto si presenta lo studio dell’evoluzione di una discarica RSU, sita in provincia di Trento, attraverso tecniche di prospezione geoelettrica in continuo. Lo scopo dello studio è di comprendere se i risultati del monitoraggio geoelettrico in continuo siano effettivamente utili nella pratica della gestione delle discariche, la quale è alla costante ricerca di soluzioni in equilibrio fra qualità ed economia. Nel dettaglio sono state eseguite misure geoelettriche passive (PS) ed attive (ERT) senza interruzioni per 5 anni (2015-2020), attraverso una matrice permanente di 72 elettrodi gestita da una centralina programmata per acquisire giornalmente due rilievi completi di potenziale e otto misure di resistività. Questo lungo monitoraggio ad alta frequenza combinato con la decisione di mantenere fissa la posizione degli elettrodi sono gli elementi originalità che verranno valutati maggiormente nel corso di questo studio. Nel corso del lavoro ci concentreremo anche sulla variazione dei parametri chimico-fisici che può essere associata all’azione delle comunità batteriche produttrici dei biogas. Tenteremo di monitorare l’attività di queste ultime e di correlarla con l’evoluzione della discarica a tre scale temporali molto diverse fra loro: i cambiamenti strutturali di lungo periodo, le variazioni stagionali e gli eventi “istantanei”. Le tecniche di acquisizione passive ed attive utilizzate si sono rivelate complementari ed il loro impiego congiunto ha permesso di definire sia le dinamiche temporali (PS) che quelle fisico-chimiche (resistività) degli eventi studiati. Grazie all’elevata frequenza di misura è stato possibile caratterizzare con buona accuratezza l’evoluzione della discarica a tutte le scale temporali proposte, consentendo interpretazioni potenzialmente utili per la gestione dell’impianto.
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Vanella, Daniela. "Monitoring and modeling fluxes transfer processes in soil-plant-atmosphere continuum across scales." Doctoral thesis, Università di Catania, 2017. http://hdl.handle.net/10761/4084.

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Alle interazioni tra le diverse componenti del sistema suolo-pianta-atmosfera (SPA) è attribuito un ruolo critico nel ciclo idrologico e della biosfera terrestre. La comunità scientifica specializzata è sempre più consapevole della necessità di portare avanti studi a carattere interdisciplinare per la comprensione delle interazioni funzionali tra le risorse naturali ed i relativi problemi di sostenibilità del sistema SPA. All interno di tali studi interdisciplinari, l analisi delle interazioni suolo-radice risulta rilevante anche per la gestione ottimale dell'irrigazione, in particolare nelle zone caratterizzate da scarsa disponibilità idrica, come le aree mediterranee. A tal fine nasce l esigenza di valutare, ad alta risoluzione sia spaziale che temporale, le dinamiche idrologiche del sistema SPA, sino alla scala dell apparato radicale. Il contributo della tesi di dottorato consiste nell applicazione di tecniche di monitoraggio avanzate e minimamente invasive, per valutare gli scambi di massa ed energia all'interno del sistema SPA. L aspetto innovativo del lavoro di tesi consiste nell integrazione di tecniche geofisiche con misure micrometeorologiche e dati di traspirazione, al fine di interpretare alcuni dei principali processi di trasferimento di flussi nel sistema SPA (evapotraspirazione ed assorbimento radicale) in ambiente semi-arido. Tale approccio, è stato applicato a due Casi studio con l obiettivo di monitorare le complesse interazioni del sistema suolo-pianta, con particolare riferimento al processo di assorbimento radicale di alberi di agrume. Nel primo Caso studio, la tecnica della tomografia di resistività elettrica (ERT) tridimensionale è stata integrata con dati di traspirazione, misure micrometeorologiche e modellistica idrologica al fine di delineare la porzione di suolo non satura interessata dalle radici attive di un aranceto adulto. Nel secondo Caso studio, il monitoraggio ERT è stato integrato con misure di traspirazione al fine di delineare i pattern di RWU di alberi di arancio irrigati in regime di deficit. I risultati del lavoro di tesi dimostrano l abilità della tecnica di monitoraggio geofisico ERT nello spiegare le dinamiche idriche del suolo e la risposta fisiologica della pianta, in termini di attività delle radici nel processo di uptake, contribuendo, in tal senso, a migliorare la conoscenza dei processi di assorbimento radicale.
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Garipova, Yulia V. "Borehold resistivity inversion." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/53031.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1997.
Includes bibliographical references (leaves 110-111).
by Yulia V. Garipova.
M.S.
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Morelli, Roberto. "Resistivity testing of concrete." Thesis, University of Edinburgh, 1985. http://hdl.handle.net/1842/15425.

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Marklund, Per. "A 2D Electrical Resistivity Survey of Palsas in Tavvavuoma, sub-arctic Sweden." Thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-219932.

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Electrical resistivity tomography (ERT) is a commonly used geophysical method to investigate permafrost in the mountain environment, but few studies have employed this method in a permafrost affected peatland. For this thesis, 5 ERT profiles were measured over 17 palsas and peat-plateaus in a palsa peatland environment in Tavvavuoma, northern Sweden, where the primary aim was to investigate the depth to the base of permafrost under the mounds. These depths are also used to estimate the excess ice fraction (EIF), which is indicative of the proportion of segregation ice in the frozen core under the mounds. The internal structure of palsas and the spatial distribution of permafrost was also investigated from the inverted resistivity models. Permafrost thickness was found to range from 5 – 17 m, with the thickest permafrost in the west end of the study area. EIF values range between 0,04 to 0,58, with the lowest values in the same end as the deepest permafrost, where also low mound elevations are found. The deep permafrost combined with low mound elevations are suggested to be attributed to the presence of coarse grained (glaciofluvial) sediments where ice segregation formation is limited, thus small amounts of frost heave. Deep permafrost is possibly underlying at least two thermokarst depressions/fens in the area, which is suggested to obstruct their drainage. The height of the mounds was surprisingly found to decrease with permafrost thickness, a relationship that is likely to be an effect of the varied underlying sediment cover. This thesis demonstrates the applicability of ERT in peatland permafrost research, but also considers the limitations of the method.
Elektrisk resistivitetstomografi (ERT) är en geofysisk metod som har använts flitigt vid undersökningar av alpin permafrost, men få studier har hittills tillämpat denna teknik vid undersökningar av permafrost i myrmarker. Under detta examensarbete på masternivå mättes 5 ERT-profiler över 17 palsar samt torvplatåer i ett palsmyrkomplex med sporadisk permafrost i Tavvavuoma, norra Sverige, med det primära målet att undersöka permafrostens mäktighet under dessa. De beräknade permafrostdjupen används även för att uppskatta isöverskottsfraktionen (EIF), vilket ger en indikation på andelen segregationsis i den frusna kärnan under respektive pals/torvplatå. Palsarnas interna struktur och den rumsliga utbredningen av permafrost i myren diskuteras också kvalitativt utifrån resistivitetsmodellerna. Permafrostmäktigheten under palsar och torvplatåer bestämdes till mellan 5 – 17 meter, med den djupaste permafrosten i den västra delen av studieområdet. Isöverskottsfraktionen varierar mellan 0,04 – 0,58, med de lägsta värdena i samma del av studieområdet som den djupaste permafrosten fanns, här är även palshöjderna låga. Den djupa permafrosten i kombination med låga palshöjder föreslås tillskrivas förekomst av grovkorniga (glaciofluviala) sediment i denna del av studieområdet, där bildningen av segregationsis begränsas. I och med detta begränsas mängden frosthävning, med låga palshöjder som resultat. Djup permafrost kan finnas under minst två thermokarstsänkor i området, vilket kan hindra dränering av dessa. Ett oväntat resultat var att palshöjd minskar med ökat permafrostdjup bland de studerade objekten, vilket bäst kan förklaras med det varierade sedimentunderlaget, som ger mycket olika förutsättningar för segregationsisbildning. Denna masteruppsats visar på tillämpligheten av ERT i myrmarker med permafrost, men beaktar även metodens begränsningar för denna tillämpning.
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Books on the topic "Resistività"

1

Zeid, Nasser Abu. Guardare all'interno delle murature: La tomografia della resistività elettrica per la caratterizzazione di murature storiche. Saonara (PD): Il prato, 2012.

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Chin, Wilson C. Resistivity Modeling. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781118926031.

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Canada, Geological Survey of. Airborne Resistivity Mapping. S.l: s.n, 1986.

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J, Palacky George, ed. Airborne resistivity mapping. Ottawa, Canada: Energy, Mines and Resources Canada, 1986.

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T, Dyos G., and Farrell T, eds. Electrical resistivity handbook. London, U.K: Peter Peregrinus on behalf of the Institution of Electrical Engineers, 1992.

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Hossain, Sahadat, Golam Kibria, and Sadik Khan. Site Investigation using Resistivity Imaging. Leiden : CRC Press/Balkema, [2018] | “CRC Press/Balkema is an imprint of the Taylor & Francis Group, an informa business.”: CRC Press, 2018. http://dx.doi.org/10.1201/9781351047609.

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Best, M. E. Resistivity mapping and electromagnetic imaging. St. John's, Nfld: Geological Association of Canada, 1992.

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Thompson, Steve. Geophysical survey - resistivity: Dunster Castle, Somerset. Poole: Dorset Institute, Archaeology Unit, 1990.

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Hans-Ulrich, Finzel, ed. Electrical resistivity of thin metal films. Berlin: Springer, 2007.

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Lovell, John Richard. Finite element methods in resistivity logging. Ridgefield, CT: Schlumberger Technology, 1993.

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Book chapters on the topic "Resistività"

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Gooch, Jan W. "Resistivity." In Encyclopedic Dictionary of Polymers, 625–26. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_9966.

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Fernandes da Silva, E. C. "GaAs: resistivity." In New Data and Updates for I-VII, III-V, III-VI and IV-VI Compounds, 219. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-48529-2_96.

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Bekkers, John. "Resistivity, Axial." In Encyclopedia of Computational Neuroscience, 2617–19. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-6675-8_35.

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Gooch, Jan W. "Surface Resistivity." In Encyclopedic Dictionary of Polymers, 717. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_11443.

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Salam, Md Abdus, and Quazi M. Rahman. "Soil Resistivity." In Power Systems, 203–50. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0446-9_5.

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Bekkers, John. "Resistivity, Axial." In Encyclopedia of Computational Neuroscience, 1–2. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4614-7320-6_35-2.

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Pala, Nezih, Ahmad Nabil Abbas, Carsten Rockstuhl, Christoph Menzel, Stefan Mühlig, Falk Lederer, Joseph J. Brown, et al. "Thermal Resistivity." In Encyclopedia of Nanotechnology, 2711. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-90-481-9751-4_100836.

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Gutowski, J., K. Sebald, and T. Voss. "CdS: resistivity." In New Data and Updates for III-V, II-VI and I-VII Compounds, 299. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-92140-0_218.

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Gutowski, J., K. Sebald, and T. Voss. "CdTe: resistivity." In New Data and Updates for III-V, II-VI and I-VII Compounds, 323. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-92140-0_240.

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Chu, J. "HgS: resistivity." In New Data and Updates for III-V, II-VI and I-VII Compounds, 395. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-92140-0_290.

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Conference papers on the topic "Resistività"

1

Candansayar, M. E., and I. Demirci. "A New 2D Finite Element Forward Solution Algorithm for dc Resistiviy Method for Large Scale Resistivity Survey." In 24th European Meeting of Environmental and Engineering Geophysics. Netherlands: EAGE Publications BV, 2018. http://dx.doi.org/10.3997/2214-4609.201802605.

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Imamura, Sugio, and Hiromasa Shima. "Near‐borehole resistivity imaging using normal resistivity logs." In SEG Technical Program Expanded Abstracts 1991. Society of Exploration Geophysicists, 1991. http://dx.doi.org/10.1190/1.1889020.

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Hermawan Manuaba, Ida Bagus Gede, Mohammad Aljishi, Marie Van Steene, and James Dolan. "LWD Laterolog vs. Electromagnetic Propagation Measurements: Which is Telling the True Resistivity?" In International Petroleum Technology Conference. IPTC, 2023. http://dx.doi.org/10.2523/iptc-23063-ms.

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Abstract The electromagnetic propagation (EMP) measurement frequently acquired with logging-while-drilling (LWD) tools in high-angle wells is sensitive to geometrical effects that can mask the true formation resistivity. Less commonly used, the LWD laterolog measurement is sometimes perceived as providing data too shallow to give a true formation resistivity (Rt). This paper presents modeling and actual examples to demonstrate that the laterolog can provide a superior resistivity measurement for formation evaluation than the does the EMP LWD tool. We examine the laterolog and EMP resistivities in several high-angle wells crossing carbonate formations in 8.5-in. and 6 1/8-in. hole sizes. In the 8.5-in. sections, producers and water injectors (high and low resistivity ranges) were evaluated. In the 6 1/8-in. sections, one reservoir sandwiched between two very high-resistivity layers and another borehole in a highly fractured reservoir were examined. The laterolog data were corrected for invasion using a 1D inversion of the memory data. Structure-based forward modeling was used to examine and explain the differences between the resistivity methods. In the first example, the laterolog data showed a clear conductive invasion profile. While the deepest laterolog real-time resistivity data indicated lower resistivity than the EMP resistivity, the true resistivity, Rt, from the 1D inversion matched the EMP resistivity. This result validated both measurements and emphasized that those differences were due to invasion. In the second example, a reservoir zone was initially drilled with resistivity measurements made only by the EMP tool. The LWD laterolog was run several days later, and the resistivity data were much lower in the relogged section compared with the EMP resistivity. The laterolog 1D inversion was unable to resolve Rt because of the excessively deep invasion that occurred over the course of several days. These two examples demonstrated that when acquired in normal drilling conditions, the laterolog measurements can provide the uninvaded formation resistivity even in the presence of invasion. A reservoir in another example was sandwiched between resistive layers that caused difficult-to-explain elevated EMP resistivity readings. Structural modeling reproduced the elevated behavior of the EMP data and explained the differences between resistivity measurements. This result showed that the laterolog is better suited to evaluate resistivity in thin reservoirs where there is a high-resistivity contrast to the adjacent layer. Finally, fractured reservoir examples are presented, which show that both the laterolog and EMP can be affected by the presence of fracture swarms. The examples presented in this paper demonstrate that in high-angle wells, under normal drilling conditions, invasion-corrected laterolog resistivity is nearer to Rt than is the EMP resistivity. Furthermore, the laterolog measurement provides data that are better input to water saturation calculations.
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Schöen, J. H., Liming Yu, D. T. Georgi, and O. Fanini. "Aspects of Multicomponent Resistivity Data and Macroscopic Resistivity Anisotropy." In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 2000. http://dx.doi.org/10.2118/62909-ms.

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Hagiwara, Teruhiko. "ML-Based Deconvolution Method Provides High Resolution Fast Inversion of Induction Log Data." In 2022 SPWLA 63rd Annual Symposium. Society of Petrophysicists and Well Log Analysts, 2022. http://dx.doi.org/10.30632/spwla-2022-0038.

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Resistivity log is used to measure the formation resistivity from which the water saturation is estimated. Because of the spatial resolution, the log resistivity Rapp (the apparent resistivity) is not the true formation resistivity when the bed is thin and/or the bed is neighbored with conductive beds. Iterative forward modeling inversion is applied to estimate the formation resistivity from the log resistivity. The inversion has to assume an earth model. Iterative forward modeling inversion is time consuming by nature. The inversion is empirical as the regularization coefficient has to be fixed empirically. We developed a deconvolution method using Machine Learning technique to invert the resistivity log accurately and fast while the bed boundaries are automatically inverted accurately within 0.5-ft that is the sampling interval of the log data. We used Machine Learning regressors to minimize errors in the true resistivity at depth z, R(z), from 2N+1 sets of log data {Rapp(z  k) , k=0, 1, …,N} where  is the sampling interval of log data, 0.5 ft. For training dataset, an earth model extending over 7,500 ft was created where the bed thickness and the bed resistivity were randomly selected in log-uniform distribution. There were more than 15,000 data points. For testing datasets three earth models extending over 1,200 ~ 1,500 ft were similarly created. The 2C40 induction log was considered for the resistivity log and the deconvolution window size N was varied from 3 to 60. Several ML regressors were used for comparison and for consistency. We found the deconvolution method to invert the resistivity log accurately and fast. Furthermore, the bed boundaries were automatically inverted very accurately within 0.5 ft, the sampling interval of log data. For 2C40 induction log, the 21-point (N=10) window over 10ft around the center of the tool worked satisfactorily for the log data in vertical wells. We used different training datasets and testing datasets, and reached the same conclusion. The Machine Learning technique has not been applied to deconvolution method. This empirical deconvolution method can invert the resistivity log accurately and fast. Most remarkably, the bed boundaries are automatically inverted very accurately within 0.5 ft. The method is not limited to resistivity logs.
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Sagisaka, Mitsuyuki, Yoshihiro Isobe, Frank Garner, Satoshi Fujita, and Taira Okita. "Development of Electrical Resistivity Measurement Systems for Inspecting Void Swelling in Irradiated Microscopy Discs." In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-29893.

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Results are presented of resistivity change measurements made on a model Fe-Cr-Ni-Ti-C austenitic alloy irradiated in the Fast Flux Test Facility to doses ranging from 1.87 to 67.8 dpa. Two different electrical resistivity measurement systems were developed to overcome problems associated with examination of small microscopy specimens in order to investigate small changes in resistivity arising from voids and other radiation-induced microstructural features. A correlation is shown between resistivity changes arising primarily from void swelling. However, contributions arising probably from radiation-induced redistribution and perhaps precipitation of carbon and titanium can dominate the resistivity at low dpa levels.
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Jackson, P., M. A. Lovell, and P. Harvey. "Electrical Resistivity Imaging." In 3rd International Congress of the Brazilian Geophysical Society. European Association of Geoscientists & Engineers, 1993. http://dx.doi.org/10.3997/2214-4609-pdb.324.1363.

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Manuaba, Ida Bagus Gede Hermawan, Rayan Adil Ghanim, Eduard Bikchandaev, and Ahmed Taher. "Far Field Petrophysics for Saturation Mapping Beyond the Wellbore." In International Petroleum Technology Conference. IPTC, 2022. http://dx.doi.org/10.2523/iptc-22638-ms.

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Abstract Most conventional logging-while-drilling (LWD) tools acquire real-time measurements from a few inches to a few feet away from the wellbore for lithology, porosity, and saturation evaluation. Deep and ultra-deep resistivity tools were developed primarily for well placement and geomapping applications and can detect resistivity variations further away, in all directions around the wellbore. This article describes integration of deep and ultra-deep resistivity measurements for saturation mapping beyond the wellbore. Deep and ultra-deep resistivity tools can map multiple formation layers and determine the resistivity of those layers far from the wellbore. Since saturation is dependent on porosity and resistivity, a workflow has been developed to combine real-time shallow measurements with inverted LWD resistivity measurements and logging data from offset wells. The geological model is updated based on deep resistivity measurements, and petrophysical parameters for each layer, combined with inverted resistivity values, are used to derive saturation. Uncertainty is defined based on weighted uncertainty in porosity from offset wells and variation in resistivity across the mapped layers. Azimuthal resistivity measurements were also used to validate the inverted values and reduce uncertainties in cases of boundaries close to the wellbore. The workflow has been tested on several wells and different reservoirs. Several wells were presented in this study utilizing a combination of shallow and deep azimuthal data along with offset logs. Different layers of different formation characteristics and saturation profiles have been crossed and the data was utilized to validate the mapped saturation values compared to the nearby measurements. The resulting saturation profile provided critical information that enhanced understanding of the reservoir and gave better insight into variation in the far field. Such information is critical for completion-design and well-placement decisions and aligns with the industry's direction toward increased data analytics combining offset wells with real-time data. A continuous improvement of the model is expected as more wells are drilled and the database increases.
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Nemuschenko, Danil, Alexandra Zaputlyaeva, Mikhail Sviridov, and Igor Kuvaev. "Vendor-Independent Stochastic Inversion Models of Azimuthal Resistivity LWD Data, Case Studies From the Norwegian Continental Shelf." In 2022 SPWLA 63rd Annual Symposium. Society of Petrophysicists and Well Log Analysts, 2022. http://dx.doi.org/10.30632/spwla-2022-0111.

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Drilling horizontal wells in complex formations is always a challenging task. The development of deep and ultra-deep azimuthal resistivity tools has largely improved the accuracy of the wellbore placement in the target zone. The enhanced imaging provided by the stochastic inversion of the azimuthal resistivity data can be applied for mapping both the internal reservoir structure and fluid contacts in the field. Major oil and gas service companies provide the operator with azimuthal resistivity tools and develop their own algorithms for resistivity data processing. Commonly services companies process azimuthal resistivity data internally. We have developed a vendor-independent stochastic inversion method that is applicable to almost any deep-azimuthal resistivity tools. This module allows operators to carry out real-time geosteering, as well as pre-job and post-job data analyses independently from the service company. This paper demonstrates the examples of the azimuthal resistivity data interpretation using synthetic data and actual data from the well offshore Norway. Calculated inversion models, based on actual data, allowed mapping of the oil-water contact and discontinuities in the reservoir that take place at the resistivity contrast boundaries. The application of this technology can increase the percentage of the horizontal well in the pay zone while letting the operator cut drilling costs through optimizing bottom hole assembly and use more advanced interpretation practices.
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Shima, Hiromasa, and Toshihiko Sakayama. "Resistivity tomography: An approach to 2‐D resistivity inverse problems." In SEG Technical Program Expanded Abstracts 1987. Society of Exploration Geophysicists, 1987. http://dx.doi.org/10.1190/1.1892038.

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Reports on the topic "Resistività"

1

Maxwell, M. Resistivity methods. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2012. http://dx.doi.org/10.4095/291771.

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2

Weiss, W. Jason, Chunyu Qiao, Burkan Isgor, and Jan Olek. Implementing Rapid Durability Measure for Concrete Using Resistivity and Formation Factor. Purdue University, 2020. http://dx.doi.org/10.5703/1288284317120.

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The durability of in-place concrete is a high priority issue for concrete pavements and bridges. Several studies have been conducted by INDOT to use electrical resistivity as a measure of fluid transport properties. Resistivity is dependent on the chemistry of the cement and supplementary cementitious system used, as such it has been recommended that rather than specifying resistivity it may be more general to specify the formation factor. Samples were tested to establish the current levels of performance for concrete pavements in the state of Indiana. Temperature and moisture corrections are presented and acceptable accelerated aging procedure is presented. A standardized testing procedure was developed (AASHTO TP 119–Option A) resulting in part from this study that provides specific sample conditioning approaches to address pore solution composition, moisture conditioning, and testing procedures. An accelerated aging procedure is discussed to obtain later age properties (91 days) after only 28 days.
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Ansari, S. M., E. M. Schetselaar, and J. A. Craven. Three-dimensional magnetotelluric modelling of the Lalor volcanogenic massive-sulfide deposit, Manitoba. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/328003.

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Unconstrained magnetotelluric inversion commonly produces insufficient inherent resolution to image ore-system fluid pathways that were structurally thinned during post-emplacement tectonic activity. To improve the resolution in these complex environments, we synthesized the 3-D magnetotelluric (MT) response for geologically realistic models using a finite-element-based forward-modelling tool with unstructured meshes and applied it to the Lalor volcanogenic massive-sulfide deposit in the Snow Lake mining camp, Manitoba. This new tool is based on mapping interpolated or simulated resistivity values from wireline logs onto unstructured tetrahedral meshes to reflect, with the help of 3-D models obtained from lithostratigraphic and lithofacies drillhole logs, the complexity of the host-rock geological structure. The resulting stochastic model provides a more realistic representation of the heterogeneous spatial distribution of the electric resistivity values around the massive, stringer, and disseminated sulfide ore zones. Both models were combined into one seamless tetrahedral mesh of the resistivity field. To capture the complex resistivity distribution in the geophysical forward model, a finite-element code was developed. Comparative analyses of the forward models with MT data acquired at the Earth's surface show a reasonable agreement that explains the regional variations associated with the host rock geological structure and detects the local anomalies associated with the MT response of the ore zones.
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Palacky, G. J. Airborne Resistivity Mapping. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/122339.

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Reid, J. S., M. A. Nicolet, M. S. Angyal, D. Lilienfeld, Y. Shacham-Diamand, and P. M. Smith. Barrier/Cu contact resistivity. Office of Scientific and Technical Information (OSTI), October 1995. http://dx.doi.org/10.2172/119996.

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Palacky, G. J. Geological Background To Resistivity Mapping. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/122343.

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Krause, B. R. Borehole induced polarization and resistivity. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/123638.

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Ohnuma, S. Heat loss by wall resistivity. Office of Scientific and Technical Information (OSTI), July 1994. http://dx.doi.org/10.2172/1155890.

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Garcia, L., P. H. Diamond, B. A. Carreras, and J. D. Callen. Theory of resistivity-gradient-driven turbulence. Office of Scientific and Technical Information (OSTI), July 1985. http://dx.doi.org/10.2172/5510493.

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10

Gold, Phillip I. Electrical Resistivity of Carbon-Carbon Composites,. Fort Belvoir, VA: Defense Technical Information Center, February 1988. http://dx.doi.org/10.21236/ada193006.

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