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Relevant bibliographies by topics / GPR

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Academic literature on the topic 'GPR'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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Journal articles on the topic "GPR"

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Kaur, Rajinder, and Abhinav Saxena. "Efficacy of bee pollen and beebread against Salmonella typhimurium in BALB/c mice." ENTOMON 49, no. 3 (2024): 417–24. http://dx.doi.org/10.33307/entomon.v49i3.1260.

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The present work evaluate the antibacterial and antioxidant potential of bee pollen and beebread against the toxic changes induced by Salmonella typhimurium in BALB/c mice. The experiment was divided into six groups as; Gp1 was normal, Gp2 was infected with Salmonella enterica serovar Typhimurium at 2×104 CFU, Gp3 and Gp5 were administrated with bee pollen and beebread of Helianthus annus crop alone at 250mg kg-1 bw respectively; Gp4 and Gp6 were with S. typhimurium and bee pollen and beebread H. annus at 250mg kg-1 bw respectively. Different hematological and oxidative stress parameters were

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El-Naggar, Sabry Ali, Karim Samy El-Said, Mona Elwan, et al. "Toxicity of bean cooking media containing EDTA in mice." Toxicology and Industrial Health 36, no. 6 (2020): 436–45. http://dx.doi.org/10.1177/0748233719893178.

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The possible renal and hepatic toxicities of ethylenediaminetetraacetic acid (EDTA) in bean cooking media were studied using 100 male albino mice. Two sublethal doses of EDTA were used to explore their toxic effects; 20 mg/kg and 200 mg/kg, which corresponded to 1/100th and 1/10th of LD50, respectively. Accordingly, the toxicity study was performed using 50 mice, divided into five groups ( n = 10/group) as follows: group 1 (Gp1) served as a negative control and was orally administered normal saline; group 2 (Gp2) was administered the bean cooking medium; group 3 (Gp3) was administered EDTA (20

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Davis, Melissa A., Leticia E. Camacho, Alexander L. Pendleton, et al. "Augmented glucose production is not contingent on high catecholamines in fetal sheep with IUGR." Journal of Endocrinology 249, no. 3 (2021): 195–207. http://dx.doi.org/10.1530/joe-21-0071.

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Fetuses with intrauterine growth restriction (IUGR) have high concentrations of catecholamines, which lowers the insulin secretion and glucose uptake. Here, we studied the effect of hypercatecholaminemia on glucose metabolism in sheep fetuses with placental insufficiency-induced IUGR. Norepinephrine concentrations are elevated throughout late gestation in IUGR fetuses but not in IUGR fetuses with a bilateral adrenal demedullation (IAD) at 0.65 of gestation. Euglycemic (EC) and hyperinsulinemic–euglycemic (HEC) clamps were performed in control, intact-IUGR, and IAD fetuses at 0.87 of gestation.

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Badawi, Rehab, Hanan Soliman, Dina Ziada, et al. "Serum Markers as a Predictor of Hepatic Fibrosis Compared to Fibroscan in chronic hepatitis B Infected Egyptian patients: A Cross-sectional Study." Open Biomarkers Journal 10, no. 1 (2020): 69–75. http://dx.doi.org/10.2174/1875318302010010069.

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Background & Aims: The gamma-glutamyl transpeptidase (GGT) to platelet ratio (GPR), the gamma-glutamyl transpeptidase to albumin (GAR) and S-index are novel biomarkers suggested to assess liver fibrosis. The aim of the work was to assess the correlation between GGT and other related markers as GAR and GPR among other previous documented markers and the degree of fibrosis and steatosis in chronic HBV Egyptian patients as measured by fibroscan. Materials And Methods: After ethical approval of the protocol, a total of 170 chronic HBV patients were recruited from tropical medicine department,

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Li, Chunjian, Chenguang Yang, Junyan Zhu, et al. "Predictive Value of Globulin to Prealbumin Ratio for 3-Month Functional Outcomes in Acute Ischemic Stroke Patients." Disease Markers 2022 (March 17, 2022): 1–8. http://dx.doi.org/10.1155/2022/1120192.

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Objective. We aimed to evaluate and compare the association between globulin to albumin ratio (GAR) and globulin to prealbumin ratio (GPR) and 3-month functional prognosis of acute ischemic stroke (AIS) patients receiving intravenous thrombolysis therapy. Methods.234 AIS patients undergoing intravenous thrombolysis were retrospectively enrolled with acute ischemic stroke from February 2016 to October 2019. Blood sample was collected within 24 h after admission. Poor outcome was defined as the modified Rankin Scale mRS ≥ 3 and a favorable outcome as mRS < 3 . Severe stroke was defined as the

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Karie, Svetlana, Vincent Launay-Vacher, and Gilbert Deray. "GPR-Antibactériens." Le Pharmacien Hospitalier 43, no. 174 (2008): 176. http://dx.doi.org/10.1016/s0768-9179(08)74210-x.

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Siragusi, Rafael Henrique De Souza, Valeska Tallia Mendes de Barros, Emiliana Andrade Fiorini, et al. "Measurement of serum lactate values in domestic cats (Felis catus) submitted to physical and chemical restraint." Brazilian Journal of Veterinary Research and Animal Science 54, no. 4 (2017): 383. http://dx.doi.org/10.11606/issn.1678-4456.bjvras.2017.132024.

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A utilização do lactato sérico é cada vez mais comum na Medicina Veterinária, por ser um excelente marcador de oxigenação tecidual, elevando-se em situações de hipóxia tecidual e realizando a glicólise anaeróbica como fonte de energia. Pesquisas científicas em cães o apontam como fator prognóstico em diversas afecções, sendo pouco utilizado em felinos domésticos devido ao elevado limiar de estresse da espécie, podendo interferir em seus valores. Assim, este trabalho avaliou os valores de lactato sérico em felinos domésticos durante contenção física e após contenção química, utilizando a associ

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TRUBITSINA, Olga P., and Vladimir N. BASHKIN. "Geopolitical Risks of Hydrocarbon Development in the Russian Arctic." Arctic and North, no. 43 (June 24, 2021): 109–27. http://dx.doi.org/10.37482/issn2221-2698.2021.43.109.

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The article is devoted to the issues of geopolitical risks (GPR) in the hydrocarbon development of the Russian Arctic. The authors pay special attention to the analysis of modern geopolitical and geostrategic challenges of the Arctic region development. The article identifies the key geopolitical factors that affect the sustainable development of the Arctic and analyzes the similarities and differences in the geostrategic positions of the Arctic Five. One of the most important factors of the XXI century that determines the alignment and interaction of various geopolitical forces is the struggl

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Zabel, Brian A., William W. Agace, James J. Campbell, et al. "Human G Protein–Coupled Receptor Gpr-9-6/Cc Chemokine Receptor 9 Is Selectively Expressed on Intestinal Homing T Lymphocytes, Mucosal Lymphocytes, and Thymocytes and Is Required for Thymus-Expressed Chemokine–Mediated Chemotaxis." Journal of Experimental Medicine 190, no. 9 (1999): 1241–56. http://dx.doi.org/10.1084/jem.190.9.1241.

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TECK (thymus-expressed chemokine), a recently described CC chemokine expressed in thymus and small intestine, was found to mediate chemotaxis of human G protein–coupled receptor GPR-9-6/L1.2 transfectants. This activity was blocked by anti–GPR-9-6 monoclonal antibody (mAb) 3C3. GPR-9-6 is expressed on a subset of memory α4β7high intestinal trafficking CD4 and CD8 lymphocytes. In addition, all intestinal lamina propria and intraepithelial lymphocytes express GPR-9-6. In contrast, GPR-9-6 is not displayed on cutaneous lymphocyte antigen–positive (CLA+) memory CD4 and CD8 lymphocytes, which traff

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P. Gnanachandra. "Remarks on rg-compact, gpr-compact and gpr-connected spaces." Malaya Journal of Matematik 3, no. 02 (2015): 207–10. http://dx.doi.org/10.26637/mjm302/011.

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We give some characterizations of rg-compact, gpr-compact and gpr-connected spaces by utilizing rg-open, gpr-open and gpr-closed sets. The paper is closely related to [A.M.Al-Shibani, rg-compact spaces and rg-connected spaces, Mathematica Pannonica, 17/1 (2006), 61-68], [Y.Gnanambal and K.Balachandran, On gpr-continuous functions in topological spaces,Indian .J.Pure appl.Math., 30(6) (1999),581-593] and [P.Gnanachandra et. al., Ultra Scientist, 24(1) A (2012), 185-191]

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Dissertations / Theses on the topic "GPR"

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Chong, Aaron A. "Complementary GPR antennas and watertank testing /." St. Lucia, Qld, 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16096.pdf.

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Sjödin, Rickard. "Interpolation and visualization of sparse GPR data." Thesis, Umeå universitet, Institutionen för fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-170946.

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Ground Penetrating Radar is a tool for mapping the subsurface in a noninvasive way. The radar instrument transmits electromagnetic waves and records the resulting scattered field. Unfortunately, the data from a survey can be hard to interpret, and this holds extra true for non-experts in the field. The data are also usually in 2.5D, or pseudo 3D, meaning that the vast majority of the scanned volume is missing data. Interpolation algorithms can, however, approximate the missing data, and the result can be visualized in an application and in this way ease the interpretation. This report has focu

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Wei, Xiangmin. "GPR data processing for reinforced concrete bridge decks." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53066.

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In this thesis, several aspects of GPR data processing for RC bridge decks are studied. First, autofocusing techniques are proposed to replace the previous expensive and unreliable human visual inspections during the iterative migration process for the estimation of the velocity/dielectric permittivity distribution from GPR data. Second, F-K filtering with dip relaxation is proposed for interference removal that is important for both imaging and the performance of post-processing techniques including autofocusing techniques and CS-based migration studied in this thesis. The targeted interferes

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Evans, Robert D. "Optimising ground penetrating radar (GPR) to assess pavements." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/20465.

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Ground penetrating radar (GPR) technology has existed for many decades, but it has only been in the last 20 to 30 years that it has undergone great development for use in near surface ground investigations. The early 1980's saw the first major developments in the application of GPR for pavements (i.e. engineered structures designed to carry traffic loads), and it is now an established investigation technique, with generic information included in several national standard guidance documents. Analysis of GPR data can provide information on layer depths, material condition, moisture, voiding, rei

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Jonason, Christofer. "Automatic velocity estimation in GPR data and migration." Thesis, Umeå universitet, Institutionen för fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-172024.

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Ground Penetrating Radar is a widely used technique for detecting objects in the subsurface. However, the objects typically appear as hyperbolic curves in the raw data's time domain. Therefore, the size and the location of the objects are hard to interpret from the raw data. Migration is a helpful technique to determine the subsurface velocity and to transform the raw data into an image where the object's size and location are easier to interpret. In this thesis, we discuss a strategy for automatic migration. We apply the automatic strategy with a few standard migration methods, Kirchhoff, Pha

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Roberts, Roger Lee. "Analysis and theoretical modeling of GPR polarization data." The Ohio State University, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=osu1273148767.

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Desai, Amresh S. "Array-based GPR SAR simulation and image reconstruction." Master's thesis, University of Cape Town, 2002. http://hdl.handle.net/11427/7397.

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Bibliography: leaves 53-55.<br>Subsurface object detection has mainly been carried out using conventional ground penetrating radar (OPR) techniques, which use a single receiving antenna from which a number of range profiles (known as ""A Scope"" images) are assembled to form a two-dimensional data field (known as a ""B Scope"" image). These OPR systems have difficulties with high clutter level, surface reflections, limited ground penetration and the required fine resolution. The resolution in the across track and along track directions is limited by the physical aperture in these directions.

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Chen, Tai-Lin Greg. "GPR propagation simulation and fat dipole antenna design." Master's thesis, University of Cape Town, 2006. http://hdl.handle.net/11427/5262.

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Word processed copy.<br>Includes bibliographical references (leaves 67-69).<br>Two applications of FEKO are reported. The first application is investigating how antennas propagate. reflect, and the difference in transmit and receive signals in various ground media. Results of the ground penetration simulations done in FEKO (MoM- Method of Moment) is compared to Finite Difference Time Domain (FDTD) results simulated by Mukhopadhyay with the same physical model. The second application is to model and fabricate an ultra wide-band antenna with implementation of the fat dipole design. The design co

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VASCONCELOS, Gracieli Louise Monteiro Brito. "Caracterização hidrogeofísica de sedimentos típicos do leito seco do rio Capibaribe: Experimentação e modelagem." Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/18306.

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Submitted by Fabio Sobreira Campos da Costa (fabio.sobreira@ufpe.br) on 2017-02-13T15:55:49Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Tese_Versão_Atualizada.pdf: 11780717 bytes, checksum: ebae4c73ebda2a950ff52becb084b253 (MD5)<br>Made available in DSpace on 2017-02-13T15:55:49Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Tese_Versão_Atualizada.pdf: 11780717 bytes, checksum: ebae4c73ebda2a950ff52becb084b253 (MD5) Previous issue date: 2015-02-27<br>FACEPE<br>As formações geológicas d

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Al-Nuaimy, Waleed. "Automatic feature detection and interpretation in ground-penetrating radar data." Thesis, University of Liverpool, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343705.

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Books on the topic "GPR"

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S, Baker Gregory, and Jol H. M, eds. Stratigraphic analyses using GPR. Geological Society of America, 2007.

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Goodman, Dean, and Salvatore Piro. GPR Remote Sensing in Archaeology. Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-31857-3.

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Goodman, Dean. GPR Remote Sensing in Archaeology. Springer Berlin Heidelberg, 2013.

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1971-, Crocco Lorenzo, Orlando Luciana, Persico Raffaele 1969-, Pieraccini Massimiliano, and Curran Associates, eds. 2010 13th International Conference on Ground Penetrating Radar, (GPR 2010): Lecce, Italy, 21-25 June 2010. IEEE, 2010.

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K, Koppenjan Steven, Lee Hua 1952-, University of California, Santa Barbara., Bechtel Nevada/Special Technologies Laboratory, GroundProbe (Australia), and Society of Photo-optical Instrumentation Engineers., eds. GPR 2002: Ninth International Conference on Ground Penetrating Radar : [April 29-May 2, 2002, Santa Barbara, Calif.]. SPIE, 2002.

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Radar, International Conference on Ground Penetrating. GPR '94: Proceedings of the fifth International Conference on Ground Penetrating Radar, June 12-16, 1994, Kitchener, Ontario, Canada. Waterloo Centre for Groundwater Research, 1994.

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Roth, Michelle L. Sample analysis and modeling to determine GPR capability for mapping fluvial mine tailings in the Coeur d'Alene River channel. U.S. Geological Survey, 1996.

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International Conference on Ground Penetrating Radar. GPR 2000: Proceedings of the 8th International Conference on Ground Penetrating Radar : [Gold Coast, Australia, 23-26 May, 2000]. Edited by Noon David A, Stickley Glen F, Longstaff Dennis, et al. SPIE, 2000.

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Geological Survey (U.S.), ed. Sample analysis and modeling to determine GPR capability for mapping fluvial mine tailings in the Coeur d'Alene River channel. U.S. Dept. of the Interior, U.S. Geological Survey, 1996.

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C, Slob Evert, Yarovoy Alex G, and Rhebergen Jan B, eds. Proceedings of the Tenth International Conference on Ground Penetrating Radar, GPR 2004: 21-24 June 2004, Delft University of Technology, Delft, The Netherlands. IEEE, 2004.

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Book chapters on the topic "GPR"

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Goodman, Dean, and Salvatore Piro. "Multi-channel GPR." In GPR Remote Sensing in Archaeology. Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-31857-3_9.

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Korves, Bernd. "Rüsselsheim: GPR Klinikum." In Geschichte der Akademischen Lehrstätten, Lehrer, Lehrerinnen und Kliniken der Hals-Nasen-Ohren-Heilkunde, Kopf- und Hals-Chirurgie in Deutschland. Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/978-3-662-64687-8_171.

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Fores, Benjamin, Guillaume Hulin, François-Xavier Simon, Laurent Paez-Rezende, and Fréderic Devevey. "GPR on city roadways: two case studies with feedback from trial trenching." In Advances in On- and Offshore Archaeological Prospection. Universitätsverlag Kiel | Kiel University Publishing, 2023. http://dx.doi.org/10.38072/978-3-928794-83-1/p22.

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GPR surveys were performed in dense urban areas in France. Underground utilities and the narrow width of the streets can make GPR really challenging for archaeological features detection. The relevance of GPR compared to trial trenching is discussed.

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Economou, Nikos, Antonis Vafidis, Francesco Benedetto, and Amir M. Alani. "GPR Data Processing Techniques." In Civil Engineering Applications of Ground Penetrating Radar. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-04813-0_11.

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Pajewski, Lara, Fabio Tosti, and Wolfgang Kusayanagi. "Antennas for GPR Systems." In Civil Engineering Applications of Ground Penetrating Radar. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-04813-0_2.

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Barouk, Louis Samuel. "Gastrocnemius Proximal Release (GPR)." In Forefoot Reconstruction. Springer Paris, 2005. http://dx.doi.org/10.1007/2-287-28937-2_5.

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Goodman, Dean, and Salvatore Piro. "Basic GPR Signal Processing." In GPR Remote Sensing in Archaeology. Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-31857-3_3.

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Novo, Alexandre. "Ground-Penetrating Radar (GPR)." In Natural Science in Archaeology. Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01784-6_9.

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Nau, Erich, Jostein Sandvik, Ole Svendgård, Knut Paasche, and Immo Trinks. "A semi-autonomous driverless geophysical survey system for efficient large-scale high-resolution archaeological prospection." In Advances in On- and Offshore Archaeological Prospection. Universitätsverlag Kiel | Kiel University Publishing, 2023. http://dx.doi.org/10.38072/978-3-928794-83-1/p75.

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This research and development project aims to evaluate the feasibility of conducting large-scale autonomous ground penetrating radar (GPR) surveys. An electric autonomous implement carrier was used to integrate a 22-channel GPR array. This innovative approach shows promise for advancing GPR survey capabilities in the future.

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Newton, Peter W., Peter W. G. Newman, Stephen Glackin, and Giles Thomson. "The Global Greyfields Transition: Why Urban Redevelopment in Low-Density, Car-Based Middle Suburbs Needs a New Model." In Greening the Greyfields. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-6238-6_1.

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AbstractThis chapter provides the framework and rationale for Greening the Greyfields and its two new models for greyfield precinct regeneration (GPR): place-activated and transit-activated GPR. They provide a basis for regenerative urban redevelopment in the middle-ring greyfield suburbs of fast-growing, low-density cities. Place-activated GPR advances a new development model for the ‘missing middle’ in cities: new medium-density housing at precinct scale. Transit-activated GPR extends new sustainable modes of mobility into car-dependent suburbs. Both processes are required for retrofitting s

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Conference papers on the topic "GPR"

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Liška, David, Marian Rybanský, Jiří Veselý, Jana Olivová, Miroslav Popela, and Stanislav Vaněk. "Riverbed Analysis using GPR." In 2025 International Conference on Military Technologies (ICMT). IEEE, 2025. https://doi.org/10.1109/icmt65201.2025.11061336.

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Tang, Qingtao, Li Niu, Yisen Wang, et al. "Student-t Process Regression with Student-t Likelihood." In Twenty-Sixth International Joint Conference on Artificial Intelligence. International Joint Conferences on Artificial Intelligence Organization, 2017. http://dx.doi.org/10.24963/ijcai.2017/393.

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Gaussian Process Regression (GPR) is a powerful Bayesian method. However, the performance of GPR can be significantly degraded when the training data are contaminated by outliers, including target outliers and input outliers. Although there are some variants of GPR (e.g., GPR with Student-t likelihood (GPRT)) aiming to handle outliers, most of the variants focus on handling the target outliers while little effort has been done to deal with the input outliers. In contrast, in this work, we aim to handle both the target outliers and the input outliers at the same time. Specifically, we replace t

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Parrini, F., R. Persico, M. Pieraccini, et al. "A reconfigurable stepped frequency GPR (GPR-R)." In IGARSS 2011 - 2011 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2011. http://dx.doi.org/10.1109/igarss.2011.6048899.

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"GPR, radars." In 2008 4th International Conference on Ultrawideband and Ultrashort Impulse Signals. IEEE, 2008. http://dx.doi.org/10.1109/uwbus.2008.4669392.

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Scherbaum, R., C. L. Hennig, I. M. Schüler, R. Buschek, M. Scheithauer, and H. J. Mentzel. "Häufigkeit und Dosis extraoraler Röntgenaufnahmen bei Kindern und Jugendlichen." In 60. GPR Jahrestagung. Georg Thieme Verlag, 2023. http://dx.doi.org/10.1055/s-0043-1771421.

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Parczyk, N., M. Parczyk, J. L. Hoh, and T. von Kalle. "Is vertebra plana in children more frequent in Langerhans cell histiocytosis or in nonbacterial osteomyelitis/chronic recurrent multifocal osteomyelitis? A single-center retrospective study." In 60. GPR Jahrestagung. Georg Thieme Verlag, 2023. http://dx.doi.org/10.1055/s-0043-1771413.

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Eckstein, J., G. Pöhler, N. Babazade, et al. "Multiparametrische MRT-Untersuchung des Herzens bei Kindern mit einem Post-COVID-Syndrom: Vergleich mit einem alters- und geschlechtsangepassten Normalkollektiv." In 60. GPR Jahrestagung. Georg Thieme Verlag, 2023. http://dx.doi.org/10.1055/s-0043-1774369.

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Hadamek, Y., P. C. Krüger, M. Waginger, and H. J. Mentzel. "Beurteilung der Clavicula im Früh-, Neugeborenen-, Säuglings- und Kleinkindalter anhand von Röntgenaufnahmen des Thorax." In 60. GPR Jahrestagung. Georg Thieme Verlag, 2023. http://dx.doi.org/10.1055/s-0043-1771411.

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Weis, M., L. Angermann, S. Schönberg, and G. Thater. "Auf fetalem MRT basierender mediastinaler Verlagerungswinkel (Mediastinal Shift Angle, MSA) als Prognoseparameter bei angeborener Zwerchfellhernie." In 60. GPR Jahrestagung. Georg Thieme Verlag, 2023. http://dx.doi.org/10.1055/s-0043-1771414.

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Gronau, J., and G. Federico Torsello. "Darstellung lymphorenaler Fisteln mittels transnodaler MR Lymphangiographie." In 60. GPR Jahrestagung. Georg Thieme Verlag, 2023. http://dx.doi.org/10.1055/s-0043-1771438.

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Reports on the topic "GPR"

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Cook, Samantha, Marissa Torres, Nathan Lamie, Lee Perren, Scott Slone, and Bonnie Jones. Automated ground-penetrating-radar post-processing software in R programming. Engineer Research and Development Center (U.S.), 2022. http://dx.doi.org/10.21079/11681/45621.

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Ground-penetrating radar (GPR) is a nondestructive geophysical technique used to create images of the subsurface. A major limitation of GPR is that a subject matter expert (SME) needs to post-process and interpret the data, limiting the technique’s use. Post-processing is time-intensive and, for detailed processing, requires proprietary software. The goal of this study is to develop automated GPR post-processing software, compatible with Geophysical Survey Systems, Inc. (GSSI) data, in open-source R programming. This would eliminate the need for an SME to process GPR data, remove proprietary s

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Alonso-Alvarez, Irma, Marina Diakonova, and Javier J. Pérez. Rethinking GPR: The sources of geopolitical risk. Banco de España, 2025. https://doi.org/10.53479/39685.

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Geopolitical risks and tensions are nowadays regularly presented by policymakers and analysts as key conditioning factors of economic activity in both the short and the medium-run. Widely accepted operational measures of geopolitical risks tend to be based on counting the number of newspaper articles related to adverse geopolitical events, in particular following the ground-breaking paper of Caldara and Iacoviello (2022) in which they build their Geopolitical Risk (GPR) indexes. In this paper we propose one avenue to make further progress in the measurement of such risks. We provide a decompos

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Campos, D. Ground penetrating radar (GPR) methods. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2012. http://dx.doi.org/10.4095/291772.

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Lever, James, Allan Delaney, Laura Ray, E. Trautman, Lynette Barna, and Amy Burzynski. Autonomous GPR surveys using the polar rover Yeti. Engineer Research and Development Center (U.S.), 2022. http://dx.doi.org/10.21079/11681/43600.

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The National Science Foundation operates stations on the ice sheets of Antarctica and Greenland to investigate Earth’s climate history, life in extreme environments, and the evolution of the cosmos. Understandably, logistics costs predominate budgets due to the remote locations and harsh environments involved. Currently, manual ground-penetrating radar (GPR) surveys must preceed vehicle travel across polar ice sheets to detect subsurface crevasses or other voids. This exposes the crew to the risks of undetected hazards. We have developed an autonomous rover, Yeti, specifically to conduct GPR s

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Ray, Laura, Madeleine Jordan, Steven Arcone, et al. Velocity field in the McMurdo shear zone from annual ground penetrating radar imaging and crevasse matching. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/42623.

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The McMurdo shear zone (MSZ) is strip of heavily crevassed ice oriented in the south-north direction and moving northward. Previous airborne surveys revealed a chaotic crevasse structure superimposed on a set of expected crevasse orientations at 45 degrees to the south-north flow (due to shear stress mechanisms). The dynamics that produced this chaotic structure are poorly understood. Our purpose is to present our field methodology and provide field data that will enable validation of models of the MSZ evolution, and here, we present a method for deriving a local velocity field from ground pen

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Kositsky, Joel, and Peyman Milanfar. A Forward-Looking High-Resolution GPR System. Defense Technical Information Center, 1999. http://dx.doi.org/10.21236/ada461034.

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Morey, Rexford M., Susanne M. Conklin, P. E. Stephen P Farrington, and James D. Shinn II, P.E. TOMOGRAPHIC SITE CHARACTERIZATION USING CPT, ERT, AND GPR. Office of Scientific and Technical Information (OSTI), 1999. http://dx.doi.org/10.2172/773811.

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Rexford M. Morey. Tomographic Site Characterization Using CPT, ERT, and GPR. Office of Scientific and Technical Information (OSTI), 1997. http://dx.doi.org/10.2172/1672.

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Walizer, Laura, Robert Haehnel, Luke Allen, and Yonghu Wenren. Application of multi-fidelity methods to rotorcraft performance assessment. Engineer Research and Development Center (U.S.), 2024. http://dx.doi.org/10.21079/11681/48474.

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We present a Python-based multi-fidelity tool to estimate rotorcraft performance metrics. We use Gaussian-Process regression (GPR) methods to adaptively build a surrogate model using a small number of high-fidelity CFD points to improve estimates of performance metrics from a medium-fidelity comprehensive analysis model. To include GPR methods in our framework, we used the EmuKit Python package. Our framework adaptively chooses new high-fidelity points to run in regions where the model variance is high. These high-fidelity points are used to update the GPR model; convergence is reached when mo

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David Cist and Alan Schutz. A LOW-COST GPR GAS PIPE & LEAK DETECTOR. Office of Scientific and Technical Information (OSTI), 2005. http://dx.doi.org/10.2172/841082.

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