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Journal articles on the topic 'Low-density anomalies'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

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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2

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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3

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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7

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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SOYJAUDAH, K. M. S., and P. C. CATHERINE. "EFFICIENT RECOVERY TECHNIQUE FOR LOW-DENSITY PARITY-CHECK CODES USING REDUCED-SET DECODING." Journal of Circuits, Systems and Computers 17, no. 02 (2008): 333–51. http://dx.doi.org/10.1142/s0218126608004289.

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We introduce a recovery algorithm for low-density parity-check codes that provides substantial coding gain over the conventional method. Concisely, it consists of an inference procedure based on successive decoding rounds using different subsets of bit nodes from the bipartite graph representing the code. The technique also sheds light on certain characteristics of the sum–product algorithm and effectively copes with the problems of trapping sets, cycles, and other anomalies that adversely affect the performance LDPC codes.

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12

Ahmad, Suhail Sayyid, Wiktor W. Weibull, R. James Brown, and Alejandro Escalona. "Observations and suggested mechanisms for generation of low-frequency seismic anomalies: Examples from the Johan Sverdrup field, central North Sea Norwegian sector." GEOPHYSICS 84, no. 1 (2019): B1—B14. http://dx.doi.org/10.1190/geo2018-0144.1.

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Using 3D broadband seismic data, we have investigated low-frequency seismic amplitude anomalies associated with and below various geologic formations in the Johan Sverdrup oil field situated in the central North Sea. Low-frequency anomalies are observed below the Intra-Draupne and the Heather and Hugin reservoirs, at the Svarte and Tor Fms, and below shallow channels. The Intra-Draupne Fm is the main oil reservoir of interest in the field, and it is relatively homogeneous, with observed low [Formula: see text] values of approximately 25–30. The Heather and Hugin reservoirs, which underlie the

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13

Danabasoglu, Gokhan, Steve G. Yeager, Young-Oh Kwon, Joseph J. Tribbia, Adam S. Phillips, and James W. Hurrell. "Variability of the Atlantic Meridional Overturning Circulation in CCSM4." Journal of Climate 25, no. 15 (2012): 5153–72. http://dx.doi.org/10.1175/jcli-d-11-00463.1.

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Abstract Atlantic meridional overturning circulation (AMOC) variability is documented in the Community Climate System Model, version 4 (CCSM4) preindustrial control simulation that uses nominal 1° horizontal resolution in all its components. AMOC shows a broad spectrum of low-frequency variability covering the 50–200-yr range, contrasting sharply with the multidecadal variability seen in the T85 × 1 resolution CCSM3 present-day control simulation. Furthermore, the amplitude of variability is much reduced in CCSM4 compared to that of CCSM3. Similarities as well as differences in AMOC variabilit

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14

Lammers, Caleb, and Joshua N. Winn. "Slow Rotation for the Super-puff Planet Kepler-51d." Astrophysical Journal Letters 977, no. 1 (2024): L1. https://doi.org/10.3847/2041-8213/ad91ae.

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Abstract Super-puffs are low-density planets of unknown origin and composition. If they form by accreting nebular gas through a circumplanetary disk, one might expect super-puffs to be spinning quickly. Here, we derive upper limits on the rotational oblateness of the super-puff Kepler-51d, based on precise transit observations with the NIRSpec instrument on board the James Webb Space Telescope. The absence of detectable oblateness-related anomalies in the light curve leads to an upper limit of about 0.15 on the planet's sky-projected oblateness. Assuming the sky-projected oblateness to be repr

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15

Dellacqua, Zachary, Claudia Di Biagio, Corrado Costa, et al. "Distinguishing the Effects of Water Volumes versus Stocking Densities on the Skeletal Quality during the Pre-Ongrowing Phase of Gilthead Seabream (Sparus aurata)." Animals 13, no. 4 (2023): 557. http://dx.doi.org/10.3390/ani13040557.

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Gilthead seabream (Sparus aurata) production is a highly valued aquaculture industry in Europe. The presence of skeletal deformities in farmed gilthead seabream represents a major bottleneck for the industry leading to economic losses, negative impacts on the consumers’ perception of aquaculture, and animal welfare issues for the fish. Although past work has primarily focused on the hatchery phase to reduce the incidence of skeletal anomalies, this work targets the successive pre-ongrowing phase in which more severe anomalies affecting the external shape often arise. This work aimed to test th

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Li, J., Z. Li, R. Han, et al. "Investigation of structures in tunnel overburdens by means of muon radiography." Journal of Instrumentation 17, no. 05 (2022): P05029. http://dx.doi.org/10.1088/1748-0221/17/05/p05029.

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Abstract Cosmic ray muon radiography is a new imaging technique that is being used to investigate the density structure of large objects and the shallow crust. For example, it has been used to investigate magma conduits of active volcanoes, cavities above tunnels and hidden chambers inside pyramids, and has proven to be effective and accurate. However, low cosmic muon flux has limited the development of muon radiography in many engineering applications. In this paper, the potential application of muon radiography to investigate density anomalies in tunnel overburden is discussed. Results show

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Xu, Chuang, Shiquan Su, Haopeng Chen, et al. "The 3D Density Structure of the South China Sea Based on Wavelet Multi-Scale Analysis of Gravity Data and Its Tectonic Implications." Remote Sensing 16, no. 19 (2024): 3675. http://dx.doi.org/10.3390/rs16193675.

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Due to its unique geographical location and complex geological evolution processes, the South China Sea has been a focus of extensive research. Previous studies on the density structure of the South China Sea mostly focused on 2D density structures, with relatively limited research on 3D density structures. A comprehensive study is still needed to refine the expansion mechanism and tectonic evolution of the South China Sea. In this study, we utilized wavelet multi-scale analysis of gravity data to obtain a 3D density model of the South China Sea and discussed its tectonic evolution from the pa

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Ma, Shu Hua, Jin Kuan Wang, Zhi Gang Liu, and Hou Yan Jiang. "Density-Based Distributed Elliptical Anomaly Detection in Wireless Sensor Networks." Applied Mechanics and Materials 249-250 (December 2012): 226–30. http://dx.doi.org/10.4028/www.scientific.net/amm.249-250.226.

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Data measured and collected by WSNs is often unreliable and a big amount of anomaly data exist. Detecting these anomaly in energy-constrained situations is an important challenge in managing these types of networks. To detect anomalies induced by the decrease of battery power, we use HyCARCE algorithm but it has the problem of low detection rate and high false positive rate when the input space consists of a mixture of dense and sparse regions which make the anomalies form clusters. The paper presents a density-based algorithm to separate the normal cluster from all clusters. The performance o

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19

d’Orgeville, Marc, and W. Richard Peltier. "Implications of Both Statistical Equilibrium and Global Warming Simulations with CCSM3. Part II: On the Multidecadal Variability in the North Atlantic Basin." Journal of Climate 22, no. 20 (2009): 5298–318. http://dx.doi.org/10.1175/2009jcli2775.1.

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Abstract The nature of the multidecadal variability in the North Atlantic basin is investigated through detailed analysis of multicentury integrations performed using the low-resolution version of the Community Climate System Model, version 3 (CCSM3), a modern atmosphere–ocean coupled general circulation model. Specifically, the results of control simulations under both preindustrial and present-day perpetual seasonal cycle conditions are compared to each other and also to the results of five simulations with increasing CO2 concentration scenarios. In the absence of greenhouse gas–induced warm

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Clark, Matthew R. "On the variability of near-surface screen temperature anomalies in the 20 March 2015 solar eclipse." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374, no. 2077 (2016): 20150213. http://dx.doi.org/10.1098/rsta.2015.0213.

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Near-surface air temperature (NSAT) anomalies during the 20 March 2015 solar eclipse are investigated at 266 UK sites, using operational data. The high density of observing sites, together with the wide range of ambient meteorological conditions, provided an unprecedented opportunity for analysis of the spatial variability of NSAT anomalies under relatively uniform eclipse conditions. Anomalies ranged from −0.03°C to −4.23°C (median −1.02°C). The maximum (negative) anomaly lagged the maximum obscuration by 15 min on average. Cloud cover impacted strongly on NSAT anomalies, with larger anomalie

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Barrows, Larry, and John D. Fett. "A high‐precision gravity survey in the Delaware Basin of southeastern New Mexico." GEOPHYSICS 50, no. 5 (1985): 825–33. http://dx.doi.org/10.1190/1.1441957.

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Since 1974, the Department of Energy has been studying bedded salt deposits in southeastern New Mexico as a possible location for disposing of defense‐generated transuranic and low‐level radioactive wastes. The program, known as the Waste Isolation Pilot Plant, includes intensive geologic characterization of about [Formula: see text] and construction of an underground test facility. The gravity survey reported here is part of the geologic site characterization. The gravity survey was conducted to delineate structural features near and at the proposed site. However, during the survey the gravit

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Lynn, C. Elissa, Frederick A. Cook, and Kevin W. Hall. "Tectonic significance of potential-field anomalies in western Canada: results from the Lithoprobe SNORCLE transect." Canadian Journal of Earth Sciences 42, no. 6 (2005): 1239–55. http://dx.doi.org/10.1139/e05-037.

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Potential-field anomalies within the Lithoprobe SNORCLE (Slave Northern Cordillera Lithospheric Evolution) transect area provide geometrical constraints for regional crustal and lithospheric structures, as well as for local anomalies when coupled with subsurface geometry visible on nearly 2500 km of deep seismic reflection and refraction profiles. Areal distribution of gravity and magnetic anomalies permit structures to be projected away from seismic cross sections, and forward modelling provides tests of different interpretations of deep (crustal and upper mantle) density structures. In a k

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23

Roy, Régis, Antonio Benedicto, Alexis Grare, Mickaël Béhaegel, Yoann Richard, and Grant Harrison. "Three-dimensional gravity modelling applied to the exploration of uranium unconformity-related basement-hosted deposits: the Contact prospect case study, Kiggavik, northeast Thelon region (Nunavut, Canada)." Canadian Journal of Earth Sciences 54, no. 8 (2017): 869–82. http://dx.doi.org/10.1139/cjes-2016-0225.

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In unconformity-related uranium deposits, mineralization is associated with hydrothermal clay-rich alteration haloes that decrease the density of the host rock. In the Kiggavik uranium project, located in the eastern Thelon Basin, Nunavut (Canada), basement-hosted shallow deposits were discovered by drilling geophysical anomalies in the 1970s. In 2014, gravity data were inverted for the first time using the Geosoft VOXI Earth ModellingTM system to generate three-dimensional (3D) models to assist exploration in the Contact prospect, the most recent discovery at Kiggavik. A 3D unconstrained inve

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Saleh, Salah, Oya Pamukçu, and Ladislav Brimich. "The major tectonic boundaries of the Northern Red Sea rift, Egypt derived from geophysical data analysis." Contributions to Geophysics and Geodesy 47, no. 3 (2017): 149–99. http://dx.doi.org/10.1515/congeo-2017-0010.

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AbstractIn the present study, we have attempted to map the plate boundary between Arabia and Africa at the Northern Red Sea rift region including the Suez rift, Gulf of Aqaba-Dead Sea transform and southeastern Mediterranean region by using gravity data analysis. In the boundary analysis method which was used; low-pass filtered gravity anomalies of the Northern Red Sea rift region were computed. Different crustal types and thicknesses, sediment thicknesses and different heat flow anomalies were evaluated. According to the results, there are six subzones (crustal blocks) separated from each oth

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Liu, Liu, Shaojun Li, Zhenming Shi, Ming Peng, and Yao Wang. "Weighted Adjoint-state Crosshole Traveltime Tomography." Journal of Physics: Conference Series 2651, no. 1 (2023): 012139. http://dx.doi.org/10.1088/1742-6596/2651/1/012139.

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Abstract The adjoint-state method of first arrival traveltime tomography, featured with implicit ray tracing calculation, was used to compute the gradient of the misfit function without introducing Fréchet derivatives. However, the majority of velocity gradients in the adjoint-state method focus on the high velocity area due to high raypath density. Thus, the current adjoint-state method faces challenges of imaging low velocity anomalies in the near-surface by crosshole seismic acquisition. In this paper, we proposed a weighted adjoint-state Eikonal equation-based crosshole traveltime tomograp

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Bernard, Gabriel, Sofiane Achiche, Sébastien Girard, and René Mayer. "Condition Monitoring of Manufacturing Processes under Low Sampling Rate." Journal of Manufacturing and Materials Processing 5, no. 1 (2021): 26. http://dx.doi.org/10.3390/jmmp5010026.

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Manufacturing processes can be monitored for anomalies and failures just like machines, in condition monitoring and prognostic and health management. This research takes inspiration from condition monitoring and prognostic and health management techniques to develop a method for part production process monitoring. The contribution brought by this paper is an automated technique for process monitoring that works with low sampling rates of 1/3Hz, a limitation that comes from using data provided by an industrial partner and acquired from industrial manufacturing processes. The technique uses kern

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Li, Huo, Goldberg, Chu, Yin, and Hammond. "Embracing Crowdsensing: An Enhanced Mobile Sensing Solution for Road Anomaly Detection." ISPRS International Journal of Geo-Information 8, no. 9 (2019): 412. http://dx.doi.org/10.3390/ijgi8090412.

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Road anomaly detection is essential in road maintenance and management; however, continuously monitoring road anomalies (such as bumps and potholes) with a low-cost and high-efficiency solution remains a challenging research question. In this study, we put forward an enhanced mobile sensing solution to detect road anomalies using mobile sensed data. We first create a smartphone app to detect irregular vehicle vibrations that usually imply road anomalies. Then, the mobile sensed signals are analyzed through continuous wavelet transform to identify road anomalies and estimate their sizes. Next,

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Kovaleva, V. N., V. A. Moskalenko, V. D. Natsik, S. N. Smirnov, V. T. Zagoskin та Yu G. Litvinenko. "Elasticity, strength, and fracture of HTS YBa2Cu3O7–δ ceramics with varying density in the temperature range 4.2-293 K". Soviet Journal of Low Temperature Physics 17, № 1 (1991): 24–27. https://doi.org/10.1063/10.0032759.

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Systematic measurements of the ultimate strength and static Young’s modulus of superconducting yttrium ceramics with varying density (3.6–5.9 g/cm3) are carried out in experiments on quasistatic compression in the temperature interval 4.2-293 K. The effect of porosity as the main structural factor of ceramic materials on mechanical properties and type of fracture is investigated. For ceramics with a low density, a peculiarity in the temperature dependence of strength correlating with anomalies in their acoustic parameters is detected in the temperature range 60–200 K. Physical mechanisms of lo

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Anggraini, Delfira, Ratni Sirait, Lailatul Husna Lubis, and Christofel Haposan Great Sibuea. "IDENTIFICATION OF ELECTROMAGNETIC ULTRA LOW FREQUENCY (ULF) SIGNAL ANOMALIES AS PRECURSORS OF A MAGNITUDE 5 EARTHQUAKE IN THE SULAWESI REGION." Jurnal Neutrino:Jurnal Fisika dan Aplikasinya 16, no. 2 (2024): 71–84. http://dx.doi.org/10.18860/neu.v16i2.26296.

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Sulawesi is situated at the intersection of three tectonic plates the Indo-Australian, Eurasian, and Philippine plates. The Palu Koro fault is one of the primary causes of seismic activity in the Sulawesi region, making it vulnerable to earthquakes on this Island. As an initial step in disaster mitigation, the information provided is useful in determining the initial signs before the occurrence of an earthquake, it is necessary to identify Ultra Low Frequency (ULF) Signal Anomalies as earthquake precursors. The methods employed are those of power spectrum density (PSD) and single-station trans

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Borselli, Diletta, Tommaso Beni, Lorenzo Bonechi, et al. "The Transmission Muography Technique for Locating Potential Radon Gas Conduits at the Temperino Mine (Tuscany, Italy)." Particles 8, no. 1 (2025): 3. https://doi.org/10.3390/particles8010003.

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Transmission muography is an imaging technique that allows us to obtain two-dimensional and three-dimensional average-target density images by measuring the transmission of atmospheric muons. Through this technique, it is possible to observe density anomalies inside a target volume and locate them three-dimensionally. In this work, the potential of the technique will be illustrated through the description of the results of two measurements carried out in the tourist path of the Temperino mine (Livorno, Italy) in an area where a higher concentration of Radon gas is measured. This section of the

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Zheng, Ying, and Jafar Arkani-Hamed. "Joint inversion of gravity and magnetic anomalies of eastern Canada." Canadian Journal of Earth Sciences 35, no. 7 (1998): 832–53. http://dx.doi.org/10.1139/e98-035.

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The power spectra and degree correlation of the surface topography and free-air gravity anomalies of eastern Canada show that the gravity anomalies are subdivided into three parts. The short-wavelength components (30-170 km, shorter than 30 km are not well resolved) largely arise from density perturbations in the crust and to a lesser extent from the surface topography and Moho undulation, whereas the contribution of intracrustal sources to the intermediate-wavelength components (170-385 km) is comparable with that of the topography. The long-wavelength components (385-1536 km) are overcompens

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Szlawska, Maria, Daniel Gnida, Piotr Ruszała, et al. "Antiferromagnetic Ordering and Transport Anomalies in Single-Crystalline CeAgAs2." Materials 13, no. 17 (2020): 3865. http://dx.doi.org/10.3390/ma13173865.

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Single crystals of the ternary cerium arsenide CeAgAs2 were grown by chemical vapor transport. They were studied by means of x-ray diffraction, magnetization, heat capacity and electrical transport measurements. The experimental research was supplemented with electronic band structure calculations. The compound was confirmed to order antiferromagnetically at the Néel temperature of 4.9 K and to undergo metamagnetic transition in a field of 0.5 T at 1.72 K. The electrical resistivity shows distinct increase at low temperatures, which origin is discussed in terms of pseudo-gap formation in the d

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Pashitskiĭ, È. A. "Low-frequency charge density excitations and high T c superconductivity in cuprate metal-oxide compounds. II. The HTS problem after discovery of high-temperature superconductors: achievements and outlooks (A review)." Low Temperature Physics 21, no. 11 (1995): 837–72. https://doi.org/10.1063/10.0033900.

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In the second part of the review, the theoretical concept concerning the leading role of low-frequency collective charge density excitations in the HTS mechanism and in manifestations of various anomalies in physical properties of metal-oxide compounds (MOC) both in the superconducting and in the normal (metallic) state is developed, proceeding from an analysis of a large body of experimental data.

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Marchetti, Dedalo, Angelo De Santis, Saioa A. Campuzano, et al. "Worldwide Statistical Correlation of Eight Years of Swarm Satellite Data with M5.5+ Earthquakes: New Hints about the Preseismic Phenomena from Space." Remote Sensing 14, no. 11 (2022): 2649. http://dx.doi.org/10.3390/rs14112649.

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Nowadays, the possibility that medium-large earthquakes could produce some electromagnetic ionospheric disturbances during their preparatory phase is controversial in the scientific community. Some previous works using satellite data from DEMETER, Swarm and, recently, CSES provided several pieces of evidence supporting the existence of such precursory phenomena in terms of single case studies and statical analyses. In this work, we applied a Worldwide Statistical Correlation approach to M5.5+ shallow earthquakes using the first 8 years of Swarm (i.e., from November 2013 to November 2021) magne

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Mutia, Rara, Mardani Mardani, Suci Fathia, and Tri Kusmita. "Identifikasi Sesar dengan Menggunakan Metode Gaya Berat (Studi Kasus: Sulawesi Tengah)." Jurnal Riset Fisika Indonesia 3, no. 2 (2023): 1–6. http://dx.doi.org/10.33019/jrfi.v3i2.3552.

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The study of the geological structure of Sulawesi Island, especially the Central Sulawesi region, is very interesting because it has high complexity as a result of the dynamic interactions of the world's three main plates. Indications of high seismic activity and deformation processes in the Central Sulawesi region can be found from the morphological appearance and activity of several existing faults such as the Palu-Koro fault, the Lawanopo fault, and the Matano fault. The data used in this study are secondary data measuring the distribution of gravitational field anomalies (FAA) and topograp

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Zimbovskaya, N. A. "On the effect of local anomalies of the Fermi surface curvature on quantum oscillatory phenomena in normal metals." Low Temperature Physics 21, no. 3 (1995): 221–23. https://doi.org/10.1063/10.0033785.

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The influence of local curvature anomalies of extremal cross sections of the Fermi surface on the shape and amplitude of quantum oscillations of the density of states of the electron liquid in a metal is considered. It is shown that the vanishing of the curvature of an extremal cross section creates more favorable conditions for observing the features of low-temperature quantum oscillations in metals.

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Baba, Katsuhisa, Rieko Sugawara, Hisashi Nitta, Kiyoshi Endou, and Akira Miyazono. "Relationship between spat density, food availability, and growth of spawners in cultured Mizuhopecten yessoensis in Funka Bay: concurrence with El Niño Southern Oscillation." Canadian Journal of Fisheries and Aquatic Sciences 66, no. 1 (2009): 6–17. http://dx.doi.org/10.1139/f08-183.

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To elucidate the factors that influence the interannual variation in the density of cultured Japanese scallop ( Mizuhopecten yessoensis ) spat, we analyzed the relationship between spat density (Ds), monthly chlorophyll a (chl a) concentration, water temperature, and adductor muscle weight of spawners over 15 years (1992–2006) in Funka Bay (Japan) on the western North Pacific Ocean. The interannual variation of spat density was best explained by a campaniform model that used chl a concentration in February ([chl]Feb) and a categorical variable that indicates whether growth of spawners in a yea

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Rehman, Mujeeb Ur, Muhammad Waseem, Abdul Sattar, and Muti Ullah. "Anomaly Detection Algorithms for Low-Dimensional and High-Dimensional Data: A Critical Study." Pakistan Journal of Engineering and Technology 6, no. 4 (2024): 42–49. http://dx.doi.org/10.51846/vol6iss4pp42-49.

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Suspicious events or objects that differ from the norm in data can be discovered using anomaly identification. Identifying anomalies is critical for many applicable domains of life, e.g., preventing credit card theft and spotting intrusions into networks. It is possible to detect anomalies on a global scale as well as at the local level. A global outlier is a data point beyond the norm for the entire dataset, while a local outlier may be inside the norm for the entire dataset but outside the surrounding data points. Data outlier identification methods that are performed locally are inadequate.

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Liu, Wenjie, Pengfei Lei, Dong Xu, and Xiaorong Zhu. "Anomaly Recognition, Diagnosis and Prediction of Massive Data Flow Based on Time-GAN and DBSCAN for Power Dispatching Automation System." Processes 11, no. 9 (2023): 2782. http://dx.doi.org/10.3390/pr11092782.

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Existing power anomaly detection is mainly based on analyzing static offline data. But this method takes a long time and has low identification accuracy when detecting timing and frequency anomalies, since this method requires offline screening, classification and preprocessing of the collected data, which is very laborious. Anomaly detection with supervised learning requires a large amount of abnormal data and cannot detect unknown anomalies. So, this paper innovatively proposes the idea of applying Time-series Generative Adversarial Networks (Time-GAN) in a dispatching automation system for

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Giraldi, F., and F. Petruccione. "Anomalies in Strongly Coupled Harmonic Quantum Brownian Motion II." Open Systems & Information Dynamics 20, no. 04 (2013): 1350015. http://dx.doi.org/10.1142/s1230161213500157.

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The analysis of a strongly coupled harmonic quantum Brownian motion has been performed in [1] for a special class of spectral densities obtained as a generalization of the Drude model. In the present scenario, we extend the study of the strongly coupled harmonic quantum Brownian motion to regular spectral densities that are structured as sub-Ohmic at low frequencies and arbitrarily shaped at high frequencies. The bosonic environment is initially in the vacuum state unentangled from the coherent state of the main oscillator. As a generalization of the previous results, we obtain that the long t

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Monarkha, Yu P. "Quantum galvanomagnetic effects in a nondegenerate two-dimensional electron gas at liquid helium surface." Soviet Journal of Low Temperature Physics 17, no. 2 (1991): 76–79. https://doi.org/10.1063/10.0032776.

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The longitudinal conductivity of a two-dimensional electron layer at the helium surface is investigated theoretically in the presence of a quantizing magnetic field normal to the liquid-vapor interface. It is shown by using Kubo’s expression for σxx and a semielliptical shape for the density of states that the electron-ripplon scattering in the low-temperature region may cause a peak on the temperature dependence of longitudinal conductivity and magnetoresistance. The obtained results help in explaining the experimentally observed low-temperature anomalies in the magnetoresistance of surface e

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Zorn, Reiner, Huajie Yin, Wiebke Lohstroh, et al. "Anomalies in the low frequency vibrational density of states for a polymer with intrinsic microporosity – the Boson peak of PIM-1." Physical Chemistry Chemical Physics 20, no. 3 (2018): 1355–63. http://dx.doi.org/10.1039/c7cp07141h.

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Nagasawa, M., K. Kawabata, T. Sambongi, P. Monceau, and T. Otsubo. "Electronic properties of (DMTSA)BF4 at ambient pressure." Journal de Physique IV 12, no. 9 (2002): 317. http://dx.doi.org/10.1051/jp4:20020425.

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Organic conductor (DMTSA)BF4 [DMTSA: 2,3dimethyl-tetra-sleno-antracene] is a compound composed of an electron donor DMTSA and a monovalent acceptor BF$_4^-$. In the salt, the electronic system is expected to be the Mott-Hubbard insulator. However, its conductivity at room temperature is 200~400$\Omega^{-1}$cm-1 and behaves metallic above ∼2OOK. At ambient pressure, we found anomalies both in the DC conductivity components and in the permittivity at ~80K, similar to those in (TMTTF)2X associated with charge ordering at ~100K. In the insulating state under low pressure, we found that the sample

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Burazer, Milenko, Milinko Grbović, and Vicko Žitko. "Magnetic data processing for hydrocarbon exploration in the Pannonian Basin, Yugoslavia." GEOPHYSICS 66, no. 6 (2001): 1669–79. http://dx.doi.org/10.1190/1.1486769.

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Because magnetic minerals may directly indicate the presence of oil and gas deposits, magnetic methods are applied to hydrocarbon exploration in oil‐bearing sedimentary basins. The basic problem in applying these methods is the isolation of weak magnetic anomalies sourced by low concentrations of the magnetic minerals present. These weak anomalies are often masked by much stronger magnetic anomalies caused by underlying magnetic rocks and/or by rocks in the basin sediments. Weak local anomalies can efficiently be isolated by applying selective 1‐D digital frequency filters. The method of filte

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VYZHVA, Serhii, Serhii POPOV, Kseniia BONDAR та ін. "IMPROVED METHODОLOGY OF DETAILED MAGNETOMETRIC SURVEY TO SOLVE THE PROBLEMS OF OIL AND GAS GEOLOGY". Visnyk of Taras Shevchenko National University of Kyiv. Geology, № 2 (105) (2024): 29–36. http://dx.doi.org/10.17721/1728-2713.105.04.

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Background. Nowadays, interest in studying the local anomalous magnetic field to solve the problems of oil and gas geology is growing, and the capabilities of the equipment can significantly increase the speed, accuracy and detail of work. Accordingly, the development and testing of an improved method of detailed magnetic recording in motion becomes relevant. Methods. For areas with low gradient magnetic field, we assessed the accuracy of the survey by comparing the maps obtained from repeated surveys of the site. Results. The survey of the magnetic field was conducted in the movement. The tot

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Febriani, F., P. Han, C. Yoshino, et al. "Ultra low frequency (ULF) electromagnetic anomalies associated with large earthquakes in Java Island, Indonesia by using wavelet transform and detrended fluctuation analysis." Natural Hazards and Earth System Sciences 14, no. 4 (2014): 789–98. http://dx.doi.org/10.5194/nhess-14-789-2014.

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Abstract. Indonesia is one of the most seismically active regions in the world and mitigation of seismic hazard is important. It is reported that Ultra low frequency (ULF) geomagnetic anomalies are one of the most convincing phenomena preceding large earthquakes (EQs). In this paper we have analyzed geomagnetic data at Pelabuhan Ratu (PLR) (7.01° S, 106.56° E), Sukabumi, West Java, Indonesia, from 1 September 2008 to 31 October 2010. There are twelve moderate–large EQs (M ≥ 5) within 160 km from the station during the analyzed period. The largest one is the M =7.5 EQ (depth = 57 km, epicentral

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Boland, A. V., and R. M. Ellis. "A geophysical model for the Kapuskasing uplift from seismic and gravity studies." Canadian Journal of Earth Sciences 28, no. 3 (1991): 342–54. http://dx.doi.org/10.1139/e91-031.

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The Kapuskasing uplift is an oblique cross section of Archean crust exposed by a major thrusting event in Early Proterozoic times. Previous results from the traveltime and amplitude analysis of compressional-wave (P-wave) arrivals from a seismic-refraction experiment have been used to constrain the modelling of shear-wave (S-wave) arrivals and gravity anomalies along the seismic profiles. S-wave and P-wave velocity information have been combined to obtain the variations of Poisson's ratio within the crust. High and low Poisson's ratio values have been linked to the mafic and felsic content, re

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Rovira-Esteva, M., N. Arul Murugan, L. C. Pardo, et al. "Differences in first neighbor orientation behind the anomalies in the low and high density trans-1,2-dichloroethene liquid." Journal of Chemical Physics 136, no. 12 (2012): 124514. http://dx.doi.org/10.1063/1.3697849.

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Kuang, Ye, Dandan Li, Xiaohong Huang, and Mo Zhou. "On the Modeling of RTT Time Series for Network Anomaly Detection." Security and Communication Networks 2022 (May 6, 2022): 1–13. http://dx.doi.org/10.1155/2022/5499080.

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Network anomalies can seriously influence the performance of networks and cause huge financial losses. Existing studies modeled the round-trip time (RTT) time series of each link and identified their abnormal patterns independently to detect the network anomalies. However, they rarely investigated the correlation among links, and they rarely considered the goodness of fit and complexity in model selection, which led to low timeliness and accuracy of detection. They failed to understand the impact of network anomalies. In this work, we propose the RTS detection approach to address these challen

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Hammer, P. T. C., J. A. Hildebrand, and R. L. Parker. "Gravity inversion using seminorm minimization: Density modeling of Jasper Seamount." GEOPHYSICS 56, no. 1 (1991): 68–79. http://dx.doi.org/10.1190/1.1442959.

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A gravity inversion algorithm for modeling discrete bodies with nonuniform density distributions is presented. The algorithm selects the maximally uniform model from the family of models which fit the data, ensuring a conservative and unprejudiced estimate of the density variation within the body. The only inputs required by the inversion are the gravity anomaly field and the body shape. Tests using gravity anomalies generated from synthetic bodies confirm that seminorm minimizing inversions successfully represent mass distribution trends but do not reconstruct sharp discontinuities. We apply

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