Relevant bibliographies by topics / Low-density anomalies

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Low-density anomalies'

Author: Grafiati
Published: 2 June 2025
Last updated: 31 July 2025

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Journal articles on the topic "Low-density anomalies"

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Szwillus, Wolfgang, Jörg Ebbing, and Bernhard Steinberger. "Increased density of large low-velocity provinces recovered by seismologically constrained gravity inversion." Solid Earth 11, no. 4 (2020): 1551–69. http://dx.doi.org/10.5194/se-11-1551-2020.

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Abstract. The nature and origin of the two large low-velocity provinces (LLVPs) in the lowest part of the mantle remain controversial. These structures have been interpreted as a purely thermal feature, accumulation of subducted oceanic lithosphere or a primordial zone of iron enrichment. Information regarding the density of the LLVPs would help to constrain a possible explanation. In this work, we perform a density inversion for the entire mantle, by constraining the geometry of potential density anomalies using tomographic vote maps. Vote maps describe the geometry of potential density anoma
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Moroi, T., A. Kitoh, and H. Koide. "Antarctic Circumpolar Wave in a coupled ocean-atmosphere model." Annals of Glaciology 27 (1998): 483–87. http://dx.doi.org/10.3189/1998aog27-1-483-487.

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An Antarctic Circumpolar Wave (ACW) is simulated by a global coupled ocean-atmosphere model. Time-longitude diagrams of anomalies in sea-surface temperature (SST) and sea-surface salinity (SSS) show that anomalies propágale eastward, taking 20-30 years to encircle the pole. The time taken is 2-3 times longer than indicated by observations, due to the relatively slow speed of the modelled Antarctic Circumpolar Current (ACC). High-SSS anomalies correspond to high-SST anomalies and high-density anomalies, and thus to low sea-surface height anomalies, indicating that salinity IS a dominant factor
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Liu, Boyang, Pang-Ning Tan, and Jiayu Zhou. "Unsupervised Anomaly Detection by Robust Density Estimation." Proceedings of the AAAI Conference on Artificial Intelligence 36, no. 4 (2022): 4101–8. http://dx.doi.org/10.1609/aaai.v36i4.20328.

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Density estimation is a widely used method to perform unsupervised anomaly detection. By learning the density function, data points with relatively low densities are classified as anomalies. Unfortunately, the presence of anomalies in training data may significantly impact the density estimation process, thereby imposing significant challenges to the use of more sophisticated density estimation methods such as those based on deep neural networks. In this work, we propose RobustRealNVP, a deep density estimation framework that enhances the robustness of flow-based density estimation methods, en
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Laurian, Audine, Alban Lazar, and Gilles Reverdin. "Generation Mechanism of Spiciness Anomalies: An OGCM Analysis in the North Atlantic Subtropical Gyre." Journal of Physical Oceanography 39, no. 4 (2009): 1003–18. http://dx.doi.org/10.1175/2008jpo3896.1.

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Abstract Oceanic teleconnections between the low and midlatitudes are a key mechanism to understanding the climate variability. Spiciness anomalies (density-compensated anomalies) have been shown to transport temperature and salinity signals when propagating along current streamlines in the subtropical gyres of the Atlantic and Pacific Oceans. The generation mechanism of spiciness anomalies in the North Atlantic subtropical gyre is investigated using an analytical model based on the late-winter subduction of salinity and temperature anomalies along isopycnal surfaces. The keystone of this appr
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Lai, W. K. M., J. I. Robson, L. J. Wilcox, and N. Dunstone. "Mechanisms of Internal Atlantic Multidecadal Variability in HadGEM3-GC3.1 at Two Different Resolutions." Journal of Climate 35, no. 4 (2022): 1365–83. http://dx.doi.org/10.1175/jcli-d-21-0281.1.

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Abstract This study broadly characterizes and compares the key processes governing internal Atlantic multidecadal variability (AMV) in two resolutions of HadGEM3-GC3.1: N216ORCA025, corresponding to ∼60 km in the atmosphere and 0.25° in the ocean, and N96ORCA1 (∼135 km in the atmosphere and 1° in the ocean). Both models simulate AMV with a time scale of 60–80 years, which is related to low-frequency ocean and atmosphere circulation changes. In both models, ocean heat transport convergence dominates polar and subpolar AMV, whereas surface heat fluxes associated with cloud changes drive subtropi
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hah, Se, Urip Nurwijayanto Prabowo, Sukmaji Anom Raharjo, and Resti Kurniati. "UTILIZATION OF SATELLITE GRAVITY ANOMALY DATA FOR TWO-DIMENSIONAL MODELING OF SUBSURFACE STRUCTURE OF SLAMET VOLCANO, CENTRAL JAVA, INDONESIA." Malaysian Journal of Geosciences 7, no. 1 (2023): 01–07. http://dx.doi.org/10.26480/mjg.01.2023.01.07.

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Study using the satellite gravity method has been carried out in the Slamet Volcano area, Central Java, Indonesia. The gravimetric satellite has produced gravity anomalies data which have been corrected up to free air correction. This study purposes to determine the subsurface structure of Slamet Volcano by modeling residual gravity anomalies data. Data processing which has been conducted includes bouguer correction, terrain correction, data reduction to a horizontal surface, separation of regional and residual anomalies data, modeling, and interpretation. The residual gravity anomalies data o
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Raymond, Ndumba Don, Manwana Mfumukani Eli-Achille, Mulongo Mandela Bigman, et al. "Contribution of Satellite Gravity Data in the Geological Study of the Territories of Punia and Lubutu in the Province of Maniema (Democratic Republic of Congo)." Contribution of Satellite Gravity Data in the Geological Study of the Territories of Punia and Lubutu in the Province of Maniema (Democratic Republic of Congo) 9, no. 2 (2024): 10. https://doi.org/10.5281/zenodo.10677738.

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This paper presents the use of satellite gravity measurements as a tool for the study of the subsurface structure of the province of Maniema, more precisely in the territories of Punia and Lubutu. To do this, we downloaded the satellite gravity data from the WGM2012 model measured by the GRACE (Gravity Recovery and Climate Experiment) satellites on the International Gravimetric Bureau (BGI) platform. Then, we applied the Bouguer correction which allowed us to transform the free-air anomalies that we had into Bouguer anomalies. Thanks to the Magmap extension of the Oasis Montaj software, we wer
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Naufal, Muhammad Z., Juan Pandu Gya Nur Rochman, Agnis Triahadini, et al. "A Study of Lineament Density and Correlation Residual Gravity Anomalies to Identify Pacul Fault in Mount Pandan, East Java." IOP Conference Series: Earth and Environmental Science 1418, no. 1 (2024): 012064. https://doi.org/10.1088/1755-1315/1418/1/012064.

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Abstract This study analyzes the identified Pacul Fault using lineament density and residual gravity anomalies in Mount Pandan, East Java. The study utilizes DEMNAS data, geological data, and gravity satellites. The research process includes creating hill shades from DEM data, extracting lineaments using PCI Geomatica software, and interpolating data to create a lineament density map. Further analysis correlates lineament density and residual anomaly with the fault zone around the Pacul Fault. The results show that fault zones are located in areas with moderate to high lineament density and at
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Ivolga, E. G., V. G. Gurovich, and Yu F. Manilov. "PETROPHYSICAL CHARACTERISTICS OF TECTONIC STRUCTURES IN WESTERN PRIOKHOTYE." Tikhookeanskaya Geologiya 41, no. 4 (2022): 75–96. http://dx.doi.org/10.30911/0207-4028-2022-41-4-75-96.

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Physical properties of rocks from western Priokhotye were studied and petrophysical maps revealing large-scale heterogeneities of tectonic elements of the territory were constructed. Petrophysical heterogeneities and anomalies of respective geophysical fields were compared. A relationship between magnetic anomalies and near-surface rock assemblages is established only for the Mesozoic volcano-plutonic structures of the Okhotsk-Chukotka volcanic belt and partially for the Yudoma-Maya tectono-stratigraphic area. In the ancient blocks of the Aldan-Stanovoy shield and the Uchur-Maya plate, magneti
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Rosu-Finsen, Alexander, Michael B. Davies, Alfred Amon, et al. "Medium-density amorphous ice." Science 379, no. 6631 (2023): 474–78. http://dx.doi.org/10.1126/science.abq2105.

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Amorphous ices govern a range of cosmological processes and are potentially key materials for explaining the anomalies of liquid water. A substantial density gap between low-density and high-density amorphous ice with liquid water in the middle is a cornerstone of our current understanding of water. However, we show that ball milling “ordinary” ice I h at low temperature gives a structurally distinct medium-density amorphous ice (MDA) within this density gap. These results raise the possibility that MDA is the true glassy state of liquid water or alternatively a heavily sheared crystalline sta
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Dissertations / Theses on the topic "Low-density anomalies"

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Agner, Mary Alexandra. "The effect of a low density residuum on geoid anomalies and topography." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/57762.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1998.<br>Includes bibliographical references (p. 27-28).<br>Recent seismological measurements of the Pacific oceanic structure have detected a positive correspondence between surface topography, seismic wave speed, and the geoid (gravitational potential). High seismic wave speed indicates cold material sinking, which pulls the surface downward. Thus, topographic lows are expected to correlate with seismic wave speed highs, contrary to the new seismic measurements. We propose models which
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Koran, François. "Anomalous wall slip behavior of linear low density polyethylenes." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=26394.

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It is becoming generally accepted that wall slip, the loss of adhesion of a polymer to a solid substrate, occurs when the shear stress exceeds a critical value. Wall slip probably plays a much more important role in plastics processing than has been previously thought. For example, the extrudate distortion called sharkskin is thought to involve slip. Recent experiments have shown that this phenomenon is highly material dependant. The surface chemistry of both the molten polymer and the bounding surface interface play important roles in both the occurrence and magnitude of wall slip. The initia
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Books on the topic "Low-density anomalies"

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Landis, Gary P. Anomalous low-density wolframite and fluid inclusion control of density, evidence from fluid inclusion content of water and carbon dioxide. Dept. of the Interior, U.S. Geological Survey, 1990.

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Landis, Gary P. Anomalous low-density wolframite and fluid inclusion control of density, evidence from fluid inclusion content of water and carbon dioxide. Dept. of the Interior, U.S. Geological Survey, 1990.

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Landis, Gary P. Anomalous low-density wolframite and fluid inclusion control of density, evidence from fluid inclusion content of water and carbon dioxide. Dept. of the Interior, U.S. Geological Survey, 1990.

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Landis, Gary P. Anomalous low-density wolframite and fluid inclusion control of density, evidence from fluid inclusion content of water and carbon dioxide. Dept. of the Interior, U.S. Geological Survey, 1990.

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Fletcher, Roland, Brendan M. Buckley, Christophe Pottier, and Shi-Yu Simon Wang. Fourteenth to Sixteenth Centuries AD. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780199329199.003.0010.

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Angkor, the capital of the Khmer Empire in Southeast Asia, was the most extensive low-density agrarian-based urban complex in the world. The demise of this great city between the late 13th and the start of the 17th centuries AD has been a topic of ongoing debate, with explanations that range from the burden of excessive construction work to disease, geo-political change, and the development of new trade routes. In the 1970s Bernard-Phillipe Groslier argued for the adverse effects of land clearance and deteriorating rice yields. What can now be added to this ensemble of explanations is the role
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Book chapters on the topic "Low-density anomalies"

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Korchin, Valery. "ANOMALIES OF LOW DENSITY IN THE CRYSTALLINE CRUST OF THERMOBARIC ORIGIN." In Oil and Gas Exploration. John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781119227519.ch15.

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Boriack, M. L., and A. W. Overhauser. "Ultra-Low-Temperature Anomalies in Heat Capacities of Metals Caused by Charge-Density Waves." In Anomalous Effects in Simple Metals. Wiley-VCH Verlag GmbH & Co. KGaA, 2010. http://dx.doi.org/10.1002/9783527631469.ch35.

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Alhassan, Ahmad, and Auwal Aliyu. "The Principle of Interpretation of Gravity Data Using Second Vertical Derivative Method." In Gravitational Field - Concepts and Applications. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.100443.

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This chapter is aimed at demonstrating how the second vertical derivative method is been applied to gravity data for subsurface delineation. Satellite gravity data of some part of Northern Nigeria that lie between latitude 11°–13°E and longitude 8°–14°N obtained from Bureau Gravimetrique International (BGI) were used for demonstration. The Bouguer graph was plotted using surfer software. The second vertical derivative graph was also plotted. Very low gravity anomalies are observed on the Bouguer map, which recommends the presence of sedimentary rocks which have low density. The result of the s
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Boudriki Semlali, Badr-Eddine, Carlos Molina, Mireia Carvajal Librado, Hyuk Park, and Adriano Camps. "Potential Earthquake Proxies from Remote Sensing Data." In New Insights on Disaster Risk Reduction [Working Title]. IntechOpen, 2024. http://dx.doi.org/10.5772/intechopen.1005382.

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At present, there is no clear scientific evidence of reliable earthquake precursors that can be used as an early warning system. However, many studies have also reported the existence of faint signatures that appear to be coupled to the occurrence of earthquakes. These anomalies have traditionally been detected using data from in-situ sensors near high-seismicity regions. On the other hand, remote sensors offer the potential of large spatial coverage and frequent revisit time, allowing the observation of remote areas such as deserts, mountains, polar caps, or the ocean. This chapter revises th
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Phethean, Jordan J. J., Martha Papadopoulou, and Alexander L. Peace. "Dense melt residues drive mid-ocean-ridge “hotspots”." In In the Footsteps of Warren B. Hamilton: New Ideas in Earth Science. Geological Society of America, 2022. http://dx.doi.org/10.1130/2021.2553(30).

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ABSTRACT The geodynamic origin of melting anomalies found at the surface, often referred to as “hotspots,” is classically attributed to a mantle plume process. The distribution of hotspots along mid-ocean-ridge spreading systems around the globe, however, questions the universal validity of this concept. Here, the preferential association of hotspots with slow- to intermediate-spreading centers and not fast-spreading centers, an observation contrary to the expected effect of ridge suction forces on upwelling mantle plumes, is explained by a new mechanism for producing melting anomalies at shal
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Ivezi, Željko, Andrew J. Connolly, Jacob T. VanderPlas, et al. "Searching for Structure in Point Data." In Statistics, Data Mining, and Machine Learning in Astronomy. Princeton University Press, 2014. http://dx.doi.org/10.23943/princeton/9780691151687.003.0006.

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Inferring the probability density function (pdf) from a sample of data is known as density estimation. The same methodology is often called data smoothing. Density estimation in the one-dimensional case has been discussed in the previous chapters. This chapter extends it to multidimensional cases. Density estimation is one of the most critical components of extracting knowledge from data. For example, given a pdf estimated from point data, we can generate simulated distributions of data and compare them against observations. If we can identify regions of low probability within the pdf, we have
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Conference papers on the topic "Low-density anomalies"

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Onuoha, C., S. McDonnell, E. Pozniak, and M. Krywko. "Pipeline Integrity Assessment, In-Line Inspection and Direct Assessment Anomaly Density." In CORROSION 2016. NACE International, 2016. https://doi.org/10.5006/c2016-07713.

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Abstract As identified during a public meeting on January 27, 2015, the National Transportation Safety Board (NTSB)(1) performed a study to evaluate the need for improvements to gas transmission integrity management (IM) programs and requirements for gas transmission pipelines. This study has concluded that while PHMSA's (2) gas IM requirements have kept the rate of corrosion failures and material failures of pipe or welds low, there is no evidence that the overall occurrence of gas transmission pipeline incidents in HCA pipelines has declined. Furthermore, the study suggests that of the four
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Bolaño, V., C. Calvo, A. Muñoz Martín, and A. Carbó. "Geophysical Study for the Detection of Voids and Low Density Anomalies in Urban Areas." In 67th EAGE Conference & Exhibition. European Association of Geoscientists & Engineers, 2005. http://dx.doi.org/10.3997/2214-4609-pdb.1.g008.

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Tian, Bowen, Qinliang Su, and Jian Yin. "Anomaly Detection by Leveraging Incomplete Anomalous Knowledge with Anomaly-Aware Bidirectional GANs." In Thirty-First International Joint Conference on Artificial Intelligence {IJCAI-22}. International Joint Conferences on Artificial Intelligence Organization, 2022. http://dx.doi.org/10.24963/ijcai.2022/313.

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The goal of anomaly detection is to identify anomalous samples from normal ones. In this paper, a small number of anomalies are assumed to be available at the training stage, but they are assumed to be collected only from several anomaly types, leaving the majority of anomaly types not represented in the collected anomaly dataset at all. To effectively leverage this kind of incomplete anomalous knowledge represented by the collected anomalies, we propose to learn a probability distribution that can not only model the normal samples, but also guarantee to assign low density values for the colle
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Nadirkhanlou, Alireza, and Fabio Concina. "Detecting Low-Quality Intervals in Surface Logging Data Using AI-Based Anomaly Detection." In SPE Europe Energy Conference and Exhibition. SPE, 2025. https://doi.org/10.2118/225579-ms.

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Abstract Anomaly detection in surface logging data is crucial for improving efficiency and reliability, particularly in industries like oil and gas exploration. This paper introduces an advanced pipeline designed specifically for detecting low-quality intervals characterized by high anomaly densities in multivariate sensor data streams. The proposed methodology integrates traditional univariate anomaly detection checks with advanced deep learning techniques, employing autoencoders to effectively capture intricate interdependencies among sensors and temporal dynamics within data streams. Our st
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ILIE, Vlad-Alexandru, Adina-Eliza CROITORU, and Titus-Cristian MAN. "MEDITERRANEAN CYCLONES TRACKS IN EUROPE WITH SPECIAL VIEW OVER ROMANIA (1985-2015)." In SCIENTIFIC RESEARCH AND EDUCATION IN THE AIR FORCE. Publishing House of “Henri Coanda” Air Force Academy, 2022. http://dx.doi.org/10.19062/2247-3173.2021.22.14.

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Mediterranean cyclones (MCs) affect not only the countries neighboring the Mediterranean basin, but also the weather conditions in regions that are not in direct contact with the Mediterranean basin such as Central, Eastern and South-Eastern Europe, including Romania. They are associated, in general, with extreme weather events. This study considered data over a 30-yr. period (December 1, 1986 – November 30, 2015). For MCs identification and their track tracing, the mean sea level pressure, 500 hPa geopotential heights, 500-1000 hPa relative topography and 850 hPa pseudo-equivalent potential t
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Davies, Mike, Robert Clark, and Ian Adsley. "High-Density Gamma Radiation Spectrometry Surveys of Contaminated Land." In ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2011. http://dx.doi.org/10.1115/icem2011-59076.

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The design of gamma radiation surveys of contaminated land has always had to compromise between the density of sampling and the accuracy of measurement. Large-area contamination is readily detected by a variety of measurement techniques, while the detection of small areas or ‘particles’ requires a high density of measurement, generally one measurement per square metre. High Resolution Gamma-radiation Spectrometry (HRGS) can provide accurate qualitative (radionuclide identification) and quantitative (Bq.g−1 of the radionuclide for a stated scenario) assessment of the state of the land, but are
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Enright, Michael P., Jonathan P. Moody, Yasin Zaman, James C. Sobotka, and R. Craig McClung. "A Probabilistic Framework for Minimum Low Cycle Fatigue Life Prediction." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-80220.

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Abstract The traditional approach to low-cycle fatigue (LCF) life prediction involves statistical characterization of total LCF life based on extensive testing of smooth fatigue specimens under multiple stress and temperature conditions. Total LCF life is modeled as a single random variable with a unimodal probability density function (PDF) from which a minimum (e.g., B0.1) life is derived. Recent studies have shown that LCF lives for some materials consist of a short-life group that initiates cracks near the first cycle of loading and a long-life group that forms cracks later in life. The com
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Yanis, Muhammad, Zaini Nasrullah, Muhammad Isa, Ananda Riski, Muzakir Zainal, and Andri Yadi Paembonan. "Optimizing the Gravity Data and Geological Observation for Mapping the Local Fault around the Jaboi Volcano." In The 5th International Conference on Science and Technology Applications. Trans Tech Publications Ltd, 2024. http://dx.doi.org/10.4028/p-mezta6.

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Geothermal is a very expensive investment industry. Therefore, it is necessary to map a geological structure in the sub-surface, i.e., faults, and rock formations that control volcanic hydrothermal systems to reduce investment risk in the exploitation of geothermal. On the other hand, the hydrothermal system aims for flow paths connecting reservoir wells for fluid production. The Jaboi Volcano, with an estimated 80 MWe located on Weh Island, Indonesia, has been planned by the government to develop electrical energy, where the excess energy will be exported to Banda Aceh via undersea cables. We
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Cowart, Jim, Terrence Dickerson, and Dianne Luning Prak. "Predicting Diesel Engine Cetane Number and Similarity for Newer Commercial Sustainable Aviation Fuels." In ASME 2023 ICE Forward Conference. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/icef2023-109879.

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Abstract A database of physical and chemical properties from one-hundred different jet fuels was used to create supervised Machine Learning (ML) models that predict Derived Cetane Number (DCN) as well as an unsupervised Self Organizing Map (SOM) of these conventional fuels. The best supervised ML models predict jet fuel DCN with just over one CN average error. The two dominant physical properties in the determination of DCN are fuel density and T50. The various models agree with increases in n-alkanes leading to higher DCN values, while increases in cyclo-aromatic content leading to decreases
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Alkaabi, Ahmed Saeed, Stephane Yves Anthoine, Muhammad Waqas, et al. "4D Seismic Monitoring With Non-Repeated OBC Geometries in Late Jurassic Carbonate Reservoir From Offshore Abu Dhabi." In SPE Reservoir Characterisation and Simulation Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/212708-ms.

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Abstract One of the proven technologies for reservoir monitoring is 4D (time-lapse) seismic. It allows tracking the fluid front for water &amp; gas and detecting pressure &amp; density changes. Although 4D seismic monitoring is challenging in the Middle Eastern carbonate reservoirs, dealing with non-repeated acquisition geometries pose additional challenges. This paper will present how the 4D seismic processing methods and techniques were applied to overcome the following challenges from an offshore Jurassic carbonate oil and gas field: Seismic acquisition geometry differences between the two
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Reports on the topic "Low-density anomalies"

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Knight, R. D., and B. A. Kjarsgaard. Comparative pXRF and Lab ICP-ES/MS methods for mineral resource assessment, Northwest Territories. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/331239.

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The Geological Survey of Canada undertook a mineral resource assessment for a proposed national park in northern Canada (~ 33,500 km2) spanning the transition from boreal forest to barren lands tundra. Bedrock geology of this region is complex and includes the Archean Slave Craton, the Archean and Paleoproterozoic Rae domain of the Churchill Province, the Paleoproterozoic Thelon and Taltson magmatic-tectonic zones, and the Paleoproterozoic East Arm sedimentary basin. The area has variable mineral potential for lode gold, kimberlite-hosted diamonds, VMS, vein uranium and copper, SEDEX, as well
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