Nico F. Declercq

Nico F. Declercq
Declercq in 2023
Born (1975-12-27) December 27, 1975
Kortrijk, Belgium
Other namesErnesto de Montisalbi,[1] Declercq de Patin,[2] Desclergue[3]
CitizenshipBelgium
Alma mater
Known forstudy of diffraction of acoustic waves and ultrasound waves
SpouseShirani Olupathage de Silva[4][5][6][7]
ChildrenBenjamin J. H. Declercq, Anna-Laura F. M. Declercq,[8][9] Lambert L. B. Declercq
Awards
Scientific career
Fields
InstitutionsGeorgia Institute of Technology
Patrons
ThesisThe interaction of complex harmonic elastic waves with periodically corrugated surfaces and with anisotropic viscoelastic and/or piezoelectric layered media (2005)
Oswald Leroy
Other academic advisors
Mack A. Breazeale
Websitedeclercq.gatech.edu

Nico Felicien Declercq (born 27 December 1975) is a Belgian physicist, mechanical engineer, poet, historian and philosopher. He is a professor[10] at the Georgia Institute of Technology in Atlanta and Georgia Tech Europe in France. He specializes in ultrasonic nondestructive evaluation of materials, propagation of ultrasonic waves in highly complex materials, in acoustics, in theoretical and experimental linear and nonlinear ultrasonics, acousto-optics, medical physics and acoustic microscopy. He has investigated the acoustics of Chichen Itza and Epidaurus.[11] He is also the author of a series of works on cosmology,[12][13] general relativity,[14], the foundations of physics[15] and, particularly, quantum mechanics,[16][17][18][19] developing Trembling Spacetime Relativity Theory (TSRT).[14][20][21] As a Ph.D. student,[22] Declercq published 30 peer-reviewed articles in reputed scientific journals, including Annalen der Physik, and made 42 presentations (with papers in proceedings) at international congresses in his field. His work has been covered in Nature News,[23][24] New Scientist,[25] USA Today,[26] The Economist,[27] The Washington Post,[28] Die Zeit,[29] and Acoustics Today.[30]

Education, career and awards

Declercq received his BSc and MSc in physics (with a major in astrophysics) from the Katholieke Universiteit Leuven in 1996 and 2000, respectively, and received a PhD in engineering physics from Ghent University in 2005. He worked as a Belgian National Science Foundation (FWO Vlaanderen) postdoctoral fellow with Ghent University and has been a visiting scientist, supported by NATO, at the National Center for Physical Acoustics at the University of Mississippi, before joining Georgia Tech in 2006.

Declercq received the International Dennis Gabor Award from the NOVOFER Foundation of the Hungarian Academy of Sciences on December 21, 2006. He received the ICA Early Career Award "For outstanding contributions to ultrasonics, particularly for studies of propagation and diffraction of acoustic waves" from the International Commission for Acoustics in 2007.[31] In 2024, he received the Raman-Charpak Award from the Indo-French Centre for the Promotion of Advanced Research, alongside collaborators from the University of Allahabad.[32][33]

Declercq served as president (2013–2015) of the steering board of the International Congress on Ultrasonics,[34] as well as president of their 2015 congress.[35] He is an associate editor of the journal Acta Acustica united with Acustica,[36] associate editor of the Journal of Nondestructive Evaluation,[37] and founding editor-in-chief of Elsevier's Physics in Medicine.[38] He serves on technical committees of the French Acoustical Society and is the Chair of the Ultrasonics Technical Committee of the European Acoustics Association.[39] Declercq has received several Teaching Excellence Awards.[40] In addition to his tenure as a full professor at Georgia Tech, he serves in a courtesy role as a full professor in the Doctoral School of the University of Lorraine in France.[41]

Professional Connections with France

Declercq is a Full Professor at the Georgia Institute of Technology in Atlanta and serves on doctoral committees worldwide,[42] including France.[43] Beyond his primary academic responsibilities, he advises PhD students at the Doctoral Schools of École Nationale Supérieure des Arts et Métiers[44] and Université de Lorraine in France.[45] Moreover, in France, Declercq has mentored PhD students even in cases where administrative constraints prevented his formal recognition as primary advisor.[46] His academic involvement in France includes serving on Habilitation and Doctoral Committees at prestigious institutions such as Sorbonne Université,[47] the Université de Lille,[48] the Université de Franche-Comté, the Université du Maine,[49] and the Université Polytechnique Hauts-de-France.[50] He has also held various positions at multiple levels within the Société Française d'Acoustique.[51] In addition, Declercq leads an ultrasonics laboratory[52] at Georgia Tech Europe, which operates within the French National Centre for Scientific Research (CNRS).

Scientific Discoveries

Declercq's research delves into the fundamental physics of wave interactions with various materials, specifically within engineering. His work explores these interactions and their applications in technological advancements.

Acoustics in Archaeology

His research in archaeoacoustics has contributed to new insights into how ancient civilizations engineered architectural spaces to manipulate sound for religious and ceremonial purposes. His interdisciplinary approach, merging acoustics and archaeology, provides a fresh perspective on acoustics in ancient societies. Declercq's investigations revised earlier understandings about the Greek theater of Epidaurus, renowned for its exceptional acoustics. He demonstrated that the limestone seats act as an acoustic filter, enhancing high-frequency sounds, such as speech, while suppressing low-frequency noise. His findings, published in Nature, revealed that the theater's design amplifies critical sound frequencies, enabling clear audibility even at distant seating. This research improved our understanding of Ancient Greek acoustic engineering, showing how seat curvature and arrangement optimized sound reflection and focus. [53] [54] His investigations at Epidaurus were followed by further studies on ancient stepped architecture, including Indian step wells exhibiting analogous acoustic properties. The retroreflective acoustics of these structures have become a key focus, with methodologies directly derived from Declercq's work. [55]

At Chichen Itza, Declercq's research revealed the chirped echo phenomenon at the Kukulkan Pyramid. A clap at its base produces an echo resembling the quetzal bird's call, sacred to the Maya, due to acoustic diffraction from the stepped architecture. Declercq's theoretical models, published in the Journal of the Acoustical Society of America and Nature, discuss the pyramid's design suggested a potential influence on cognition.[56][57] This discovery contributed to the field of archaeoacoustics and influenced interpretations of ancient acoustical design. Bilsen (2006) expanded on Declercq's findings, proposing new theoretical frameworks for acoustic phenomena in ancient monuments, suggesting intentional sound manipulation in Mesoamerican and Mediterranean structures. [58] Valenzuela et al. (2020), for instance, applied Declercq's principles to study how sacred spaces may have been acoustically engineered to influence cognition during rituals. [59] Pentcheva's (2018) study on Byzantine aural architecture integrates Declercq's acoustics research to demonstrate how sacred Byzantine spaces were acoustically engineered to amplify religious experiences through sound. [60] Declercq's research on ancient acoustics has also contributed to understanding of architectural acoustics and its application to modern architectural design, contemporary soundscapes, and urban design. For instance, Wang et al. (2018) applied acoustic modeling techniques inspired by Declercq's methods to investigate how sound scattering from periodically corrugated surfaces could control noise in modern environments, optimizing sound distribution and enhancing desired acoustics in urban spaces. [61] Declercq's investigation of the acoustic raindrop effect, reported in New Scientist, revealed similarities between audible acoustics and SAW devices used in microelectronics. [62][63]

Wave Propagation in Anisotropic and Piezoelectric Materials

His investigations in wave propagation in anisotropic and piezoelectric materials have contributed to understanding of electric field and mechanical stress effects on inhomogeneous waves. His focus on piezoelectric crystals, which generate electric charges under mechanical deformation, has broad applications in acousto-optic devices, non-destructive evaluation (NDE), and sonar systems. His studies, published in Annalen der Physik and Ultrasonics, revealed that inhomogeneous waves in piezoelectric materials are far more sensitive to electric fields and mechanical stress than homogeneous waves. These waves, with complex wave vectors and exponential decay, show altered velocities and polarization due to piezoelectric stiffening, a critical insight for improving acousto-optic technology, such as Bragg cells for laser modulation. Prior to Declercq's work, studies on sound in stressed piezoelectric materials were limited. [64][65] An essential application of this research is in sonar technology under high hydrostatic pressures, where pressure amplifies piezoelectric effects, ensuring accurate performance in deep-sea military operations or extreme environments, such as subsurface ocean exploration on icy moons.[66][67]

His research on piezoelectric materials has advanced Surface Acoustic Wave (SAW) sensor development across applications such as torque measurement, mass sensitivity, and biosensing, including optimizing biomolecule detection in biological applications. [68] [69] His research extends beyond SAW sensors, influencing acousto-optic devices and phononic crystals. His models have optimized acousto-optic modulators, improving frequency stability and stress performance. His work on anisotropic and piezoelectric materials has been significant in advancing phononic crystals for sound wave control in periodic structures, with applications in signal processing, wave filtering, and next-generation metamaterials. [70] His work on inhomogeneous waves obliquely incident on periodic structures has advanced our understanding of wave propagation in phononic crystals and metamaterials. His theoretical and experimental contributions have enabled more precise control of sound waves, with significant applications in structural health monitoring and advanced signal processing. [71]

Backward Beam Displacement in Ultrasonic Waves

Declercq is recognized for providing a theoretical explanation for the backward beam displacement of ultrasonic waves reflected from periodically corrugated surfaces, a phenomenon observed experimentally by Mack A. Breazeale in 1976 but lacking a clear theoretical basis for nearly three decades. [72] His research elucidated the role of Scholte-Stoneley and leaky Rayleigh waves in producing this lateral shift of reflected ultrasonic beams, contributing to the understanding of wave interactions with structured surfaces. His work, published in Applied Physics Letters and the Journal of Applied Physics, extended classical diffraction theory and inhomogeneous wave theory to reveal that the effect arises under specific angles and beam configurations, addressing the gaps left by earlier studies. His contributions have had implications for acoustics and related fields. [73][74] His findings are now integral to non-destructive testing (NDT), particularly in detecting defects on corrugated surfaces and assessing material integrity. [75] His work on backward beam displacement has contributed to advances in acoustics and influenced fields like optics, quantum mechanics, and metamaterials. His findings have drawn parallels with lateral optical beam shifts, notably the Goos–Hänchen effect. These insights have prompted renewed studies in optics, particularly on surface plasmon resonance and wave reflection in quantum mechanics. [76][77] Studies by Chen et al. have further demonstrated the applicability of his theories in wave localization and beam displacement within phononic crystals. [78] He was the first to observe backward displacement in transmission[79] and in pulsed ultrasonic applications.[80]

Non-Destructive Evaluation (NDE) Techniques

He has made advancements in non-destructive evaluation (NDE) techniques, particularly for detecting internal damage in fiber-reinforced polymers (FRPs) and composites used in the aerospace and automotive industries. These lightweight, high-strength materials are prone to delamination, micro-cracking, and fiber breakage, which traditional methods often fail to detect. His research in Lamb waves and terahertz-based NDE has bridged this gap. His work has enhanced detection capabilities, identifying internal defects in polyamide-based composites susceptible to fatigue and impact damage. He has enabled real-time damage detection by employing techniques like Lamb waves, infrared thermography, and X-ray tomography, offering solutions for operational monitoring in industries reliant on these materials. [81][82] His ultrasonic-guided wave techniques have demonstrated efficient in detecting delamination, of importance in aerospace engineering, where real-time, noninvasive integrity monitoring of components under extreme stress is essential. [83]

His advancements in Scanning Acoustic Microscopy (SAM) have enabled subsurface analysis of composite and biological materials, extending its utility to evaluating microscale periodic structures, notably in semiconductors and microelectronics. SAM's precision in measuring surface and subsurface properties is now pivotal in determining the viscoelastic characteristics of materials, a key aspect for both scientific inquiry and industrial applications. [84] In the biomedical domain, his study utilizes Scanning Acoustic Microscopy (SAM) to investigate the elastic properties of biological tissues. A key study on Descemet's membrane in the human eye demonstrated SAM's ability to noninvasively detect elasticity changes due to Fuchs' endothelial dystrophy, highlighting its potential for early disease detection and monitoring. [85]

His work in Structural Health Monitoring (SHM) has advanced high-pressure environments like hydrogen storage systems for automotive and aerospace applications. He used embedded piezoelectric sensors in composite pressure vessels, utilizing ultrasonic guided waves for early-stage damage detection, useful for enhancing the safety and reliability of hydrogen-powered vehicles, where timely damage detection mitigates catastrophic failure risks. [86] His incorporation of machine learning with ultrasonic NDE techniques improves damage detection in noisy environments, important for industries like aerospace, where real-time accuracy is essential. [87] Declercq has worked on terahertz (THz) technology for non-destructive evaluation, integrating polarization-resolved THz imaging with ultrasonic techniques to detect subsurface damage in fiber-reinforced composites. His work on THz wave interactions with carbon fiber orientation enables precise differentiation between intra-laminar and inter-laminar damage, an essential advancement for aerospace applications. [88] Building on his expertise with polarized ultrasound in non-destructive testing (NDT), he successfully extended these principles to terahertz (THz) technology.[89] Its integration with advanced imaging methods improves the precision and efficacy of non-destructive testing in complex material systems. [90]

Biomedical Research

He has contributed to the biological field, enhancing our understanding of blood storage, the Descemet's membrane in corneal disease diagnostics, and ultrasonic wave interactions with biological tissues. In transfusion medicine, his research on ultrasound-based evaluation of stored blood addresses the storage lesion phenomenon, where red blood cells deteriorate during storage, affecting transfusion efficacy. He has demonstrated that ultrasound can noninvasively monitor blood quality in real-time without compromising the storage environment. This method enables clinicians to detect when blood begins to degrade, optimizing storage, minimizing waste, and enhancing transfusion safety. [91] His research has made strides in ophthalmology, employing GHz Scanning Acoustic Microscopy (GHz-SAM) to examine the biomechanical properties of corneal tissues, particularly the Descemet's membrane. His contributions are important for advancing the diagnosis of Fuchs' Endothelial Dystrophy (FECD), which leads to membrane thickening, corneal edema, and vision impairment. By leveraging GHz-SAM for high-resolution, noninvasive imaging, He has enabled early detection of corneal diseases through precise elasticity mapping at the microscopic level. [85] [92]

Solar Panel Inspection and Lightweight Automotive Solutions for a Sustainable Economy

Declercq's research in the renewable energy sector, particularly in the ultrasonic inspection of solar photovoltaic modules, has been instrumental in detecting cracks and defects in thin-film solar panels' front glass. He has enabled faster, more efficient damage detection by utilizing high-order Lamb waves, for ensuring long-term solar system reliability. Published in several influential journals, his contributions support the widespread adoption of solar energy by addressing critical challenges in maintaining solar infrastructure. [93] His contributions to the automotive industry, particularly in ultrasonic damage detection for composites, have played a pivotal role in reducing vehicle mass and CO2 emissions. His collaboration with Fodil Meraghni from ENSAM Metz, funded by Peugeot-PSA, led to the development of a novel acoustic damage indicator for fiber-reinforced composites. This indicator offers reliable damage estimation that aligns with X-ray analysis, providing essential non-destructive evaluation (NDE) techniques applicable in both production and maintenance phases. The importance of this work is highlighted in the 2020 report by the French Committee of Automobile Constructors (CCFA), which cites the successful reduction of 100 kg in average car mass as one of the developments contributing to reduced carbon dioxide emissions in France. [94] Prior to his contributions to the automotive sector, his work involved the development of Polar Scan systems for the inspection of lightweight composite structures composed of carbon fibers embedded in polypropylene thermoplastic (PPT), as seen in applications such as the Airbus A380. He developed a comprehensive simulation model for multilayered anisotropic media with triclinic symmetry.[95][96]

Phononic Crystals and Metamaterials

His research in phononic crystals and acoustic metamaterials has contributed to understanding of wave propagation in periodic structures, mainly through his pioneering work on acoustic bandgaps—regions where sound cannot propagate. Prior to his research, the effects caused by acoustic or ultrasonic evanescent waves or the finite dimensions of phononic crystals were not investigated. His findings have implications for noise reduction, sonar systems, and signal processing applications. An essential contribution is his demonstration of how phononic crystals can be engineered to control sound waves at specific frequencies, analogous to photonic crystals for light. By fine-tuning these structures, materials can be designed to redirect, focus, or block sound, benefiting industries like automotive noise control and defense stealth technologies. [97] His research has contributed to innovations in next-generation sensors and acoustic lenses, providing enhanced control over sound wave propagation and focusing. His studies on the Goos-Hänchen effect in acoustic waves have informed the design of metamaterials for sonar and ultrasound imaging, enabling more precise sound control in these technologies. [76] His theoretical insights have informed underwater communication systems and seafloor mapping technologies, where precise control of surface waves is essential. For instance, research on Scholte wave excitation at sinusoidal seafloor interfaces builds on Declercq's work, modeling wave interactions with periodic underwater structures to enhance signal clarity. [98]

Sonar Applications and NDT in the Naval Sector

Throughout his research career, he has maintained strong affiliations with the maritime industry, particularly through his contributions to sonar technologies and the nondestructive testing of ship hulls. His theoretical and experimental work on detecting navigable mud depths via bounded ultrasonic beams emitted by sonars marked innovation in the field. Prior to his research, this approach had not been considered within the scope of sonar applications, representing important advancement for both military and civilian maritime operations.[99] His research on autonomous inspection systems using ultrasonic guided waves (UGWs) has improved industrial inspections, particularly for large metallic structures like ship hulls and storage tanks. His work integrates Lamb waves-based sensors into robotic platforms in collaboration with other teams, enabling long-range, non-destructive evaluations (NDE) with minimal human intervention, improving safety and efficiency in hazardous or labor-intensive environments. [100] An essential contribution is his integration of SLAM (Simultaneous Localization and Mapping) algorithms into robotic inspection systems, enabling autonomous navigation in complex, noisy, or visually obstructed environments like underwater or industrial settings. His research has strengthened SLAM algorithms by improving their robustness against heavy-tailed noise distributions, common in industrial conditions where signal interference or environmental noise can distort sensor data. [101] His enhancements in SLAM systems enable autonomous inspection robots to more effectively navigate and map large-scale metal structures, even in traditionally challenging environments. His integration of multi-order ultrasonic echoes with advanced mapping techniques has further expanded robotic inspection capabilities. By advancing pose-graph SLAM models, his work allows for more accurate mapping, even in the structural complexities of ship hulls and natural gas storage tanks. [102]

Philosophical Works

Declercq, who publishes as Ernesto de Montisalbi, is a philosopher whose work explores the profound intersections of human existence, ethics, and the natural world. He often blends scientific insights with poetic reflections on morality and society. His philosophy characterizes inquiry into the ethical implications of technological and societal advancements.

  • Demitasse Chastity (2023, 454 pages) focuses on the concept of haecquidessence, the personal essence transformed through actions. The book delves into themes of identity, authenticity, and morality, encouraging readers to reflect on the human condition through a mix of narrative and philosophical exploration.[103]
  • Grievous Reminiscence (2024, 493 pages) blends autobiographical fiction with historical reflection, addressing the ethical and existential challenges faced by individuals during societal conflicts. The book offers philosophical inquiries into themes of authority, responsibility, and the long-lasting effects of historical events on personal identity.[104]

Poetry

Declercq has published three volumes of poetry, collections written under the pseudonym Ernesto de Montisalbi.[105]

  • Heart Embers, 97 poems.[106]
  • Light Whispers, 94 poems.[107]
  • Soul Sparks, 93 poems.[108]

Historical Studies

Declercq has published several books exploring history through the lens of his ancestors' lives, with the collection compiled in an Omnibus Edition.[109]

Declercq applied scientific methods, such as ultraviolet fluorescence and infrared spectroscopy, in his historical research to analyze artifacts and materials.[110]

References

  1. ^ Nico F. Declercq, in his capacity as an author of works unrelated to his professional expertise, utilizes the pseudonym 'Ernesto de Montisalbi' for the publication of his literary compositions, particularly in the fields of poetry and philosophy.
  2. ^ Declercq de Patin, Nico Felicien (2017). "Editorial Introduction on Proceedings of the 2015 International Congress on Ultrasonics, 2015 ICU Metz". Physics Procedia. 70 (Proceedings of the 2015 International Congress on Ultrasonics, Metz, France): 1–5. doi:10.1016/j.phpro.2015.08.001.
  3. ^ Contijoch, Eduard; Declercq, Nico (2018). "La Història Belga de la Família Desclergue de Montblanc [The Belgian story of the Desclergue family of Montblanc] (in Catalan)". El Foradot-Revista Bimestral de Montblanc. 108: 23–28. doi:10.1016/j.phpro.2015.08.001.
  4. ^ Biography of Declercq Nico Felicien in Marquis Who's Who in America
  5. ^ "Genealogy & Heraldry". declercq.gatech.edu.
  6. ^ de Salazar y Castro, Luis (1685). Historia genealogica de la Casa de Silva (English: Genealogical history of the House of de Silva) (1st ed.). Retrieved September 17, 2014.
  7. ^ a review of the battle led by Dom Diogo de Silva at Horana and Uduwara (birthplace of Declercq's spouse) and the consequent construction of a Portuguese fortress there; in P. E. Pieris, Litt. D., "Ceylon and the Portuguese 1505-1658", Chapter VII, pp. 132-133, American Ceylon Mission Press, Tellippalai, Ceylon, 1920.
  8. ^ Zonta International (May 2022). "Young Women in Public Affairs Award". Zonta International. Retrieved 2023-05-16.
  9. ^ KW, Redatie (November 26, 2020). "Rhizo Campus Lyceum OLV-Vlaanderen-Kortrijk zet verdienstelijke leerlingen in de bloemetjes". Krant van West-Vlaanderen. Retrieved 2023-05-16.
  10. ^ "Five Woodruff School Faculty Awarded Promotions". Georgia Tech News. Retrieved 2022-04-05.
  11. ^ Chao, Tom (5 April 2007). "Mystery of Greek Amphitheater's Amazing Sound Finally Solved". LiveScience. Retrieved 2007-04-05.
  12. ^ Declercq, Nico F. (2025). "Emergence of 4D Spacetime and Cosmic Expansion from Causal Geometry". Zenodo. doi:10.5281/zenodo.16656746.
  13. ^ Declercq, Nico F. (2025). "The Geometric Origin and Finite Classification of Fundamental Particles in Trembling Spacetime". Zenodo. doi:10.5281/zenodo.15830692.
  14. ^ a b Declercq, Nico F. (2025). "A Unified Geometric Theory of Trembling Spacetime Relativity". Zenodo. doi:10.5281/zenodo.15360946.
  15. ^ Declercq, Nico F. (2025). "Derived Dynamics in Trembling Spacetime Relativity : A Unified Geometric Basis for the Principles of Inertia, Equivalence, Action, and Energy–Mass Relations". Zenodo. doi:10.5281/zenodo.18050230.
  16. ^ Declercq, Nico F. (2025). "Corpuscular Light in Trembling Spacetime: A Geometric Foundation for Planck's Radiation Law and the Limits of Temperature". Zenodo. doi:10.5281/zenodo.15586864.
  17. ^ Declercq, Nico F. (2025). "Causal Entanglement from Deterministic Geodesic Correlation in Trembling Spacetime". Zenodo. doi:10.5281/zenodo.15490040.
  18. ^ Declercq, Nico F. (2025). "Beyond Superposition and Collapse: Double-Slit Interference from Trembling Spacetime Geodesics". Zenodo. doi:10.5281/zenodo.15425854.
  19. ^ Declercq, Nico F. (2025). "A Geometric Theory of Atomic Structure Without Quantum Postulates". Zenodo. doi:10.5281/zenodo.15682930.
  20. ^ Troha, Tracie (16 December 2025). "New Theory Proposes a Unified Way to Understand the Universe — From Atoms to Galaxies : Georgia Tech professor develops geometric framework that connects quantum physics, relativity and nuclear science". G.W. Woodruff School of Mechanical Engineering News.
  21. ^ Declercq, Nico F. (January 4, 2026). Trembling Spacetime: A Conceptual Introduction to Geometry, Motion, and Matter Beyond Quantum Postulates. ISBN 9798242522565. Retrieved January 21, 2026.
  22. ^ September 5, 2001 - May 12, 2005
  23. ^ "Mystery of 'chirping' pyramid decodedAcoustic analysis shows how temple transforms echoes into sounds of nature". Nature. 14 December 2004. doi:10.1038/news041213-5.
  24. ^ Ball, Philip (23 March 2007). "Why the Greeks could hear plays from the back row". Nature. doi:10.1038/news070319-16.
  25. ^ Linda Geddes, Mayans 'played' pyramids to make music for rain god, New Scientist, magazine issue 2726, page 12, 2009 (16 September 2009).
  26. ^ Dan Vergano, Maya pyramids pose acoustic riddle, USA Today, Posted 11/14/2010.
  27. ^ "No need to shout, Why the acoustics of ancient Greek theatres are so good". The Economist. 29 March 2007. Retrieved 2007-04-14.
  28. ^ Vedantam, Shankar (9 April 2007). "Seating in Ancient Greek Theater Found to Help the Acoustics". Washington Post. Retrieved 2007-04-14.
  29. ^ "Tschirp, tschirp, Wenn die Treppe singt". Die Zeit. 5 January 2005. Retrieved 2023-07-13.
  30. ^ Declercq, Nico Felicien (January 2013). "On the Fascinating Phenomenon of Diffraction by Periodic Structures". Acoustics Today. 9: 8. doi:10.1121/1.4802078.
  31. ^ "ICA - Early Career Award - Past Recipients". International Commission for Acoustics. Archived from the original on 2016-03-03. Retrieved 2014-05-28.
  32. ^ Ajit Kumar Maddheshiya (PhD student who benefitted from the Fellowship, enabling him to conduct research in Declercq's lab), Phool Singh Yadav, and Raja Ram Yadav, Physics Department, University of Allahabad. The award (2023-RCF-IN-0067) is named after Nobel laureates C.V. Raman and Georges Charpak and is a joint initiative by the Government of India, the French Embassy in India, and CEFIPRA.
  33. ^ "Raman-Charpak fellowship". Daily Excelsior. 17 February 2024. Retrieved 2024-08-21.
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  40. ^ "Website of the Student recognition excellence in teaching, Class 1934 Honor Roll". Retrieved 2023-02-26.
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  47. ^ Slah Yaacoubi, "Process and Structural Health Monitoring: Development of Tailored Solutions Based on Artificial Intelligence," Habilitation à diriger des recherches (HDR), Sorbonne University, 12 May 2023. Jury members: Didem Ozevin, Nazih Mechbal, Babak Nahidmobarakeh, Alain Bernard, Yoshinori Hirata, Quentin Grimal, Nico F. Declercq.
  48. ^ Benaissa, Hichem (19 December 2008). "Lille, Open Archive". Retrieved 2024-09-01.
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  52. ^ Laboratory for Ultrasonic Nondestructive Evaluation, International Research Laboratory IRL 2958 Georgia Tech – CNRS
  53. ^ Ball, Philip (2007). "Why the Greeks could hear plays from the back row". Nature. doi:10.1038/news070319-16.
  54. ^ Declercq, Nico F.; Dekeyser, Cindy S. A. (2007). "Acoustic diffraction effects at the Hellenistic amphitheater of Epidaurus: seat rows responsible for the marvelous acoustics". Journal of the Acoustical Society of America. 121 (4): 2011–2022. Bibcode:2007ASAJ..121.2011D. doi:10.1121/1.2709842. PMID 17471718.
  55. ^ Cabrera, Densil; Lu, Shuai (2022). "Sound Reflections in Indian Stepwells: Modelling Acoustically Retroreflective Architecture". Acoustics. 4 (1): 227–247. doi:10.3390/acoustics4010014. hdl:2123/27570.
  56. ^ Declercq, Nico F.; Degrieck, Joris; Leroy, Oswald (2004). "A theoretical study of special acoustic effects caused by the staircase of the El Castillo pyramid at the Maya ruins of Chichen-Itza in Mexico". The Journal of the Acoustical Society of America. 116 (6): 3328–3335. Bibcode:2004ASAJ..116.3328D. doi:10.1121/1.1764833. PMID 15658685.
  57. ^ Ball, Philip (2004). "Mystery of 'chirping' pyramid decoded". Nature. doi:10.1038/news041213-5.
  58. ^ Bilsen, Frans A. (August 2006). "Repetition Pitch Glide from the Step Pyramid at Chichen Itza". Journal of the Acoustical Society of America. 120 (2): 594–596. Bibcode:2006ASAJ..120..594B. doi:10.1121/1.2213570. PMID 16938945.
  59. ^ Valenzuela, Jose; Díaz-Andreu, Margarita; Escera, Carles (2020). "Psychology Meets Archaeology: Psychoarchaeoacoustics for Understanding Ancient Minds and Their Relationship to the Sacred". Frontiers in Psychology. 11 550794. doi:10.3389/fpsyg.2020.550794. PMC 7775382. PMID 33391069.
  60. ^ Pentcheva, Bissera V. (2018). Aural Architecture in Byzantium: Music, Acoustics, and Ritual. Stanford University Press.
  61. ^ Wang, Shuping; Tao, Jiancheng; Qiu, Xiaojun; Cheng, Jianchun (December 2018). "Effects of periodically corrugated surfaces on sound scattering". Journal of Sound and Vibration. 436: 1–14. Bibcode:2018JSV...436....1W. doi:10.1016/j.jsv.2018.08.012. hdl:10453/129856.
  62. ^ Geddes, Linda (2009). "Mayans 'played' pyramids to make music for rain god". Nature.
  63. ^ Cruz Calleja, Jorge Antonio; Declercq, Nico F. (2009). "The acoustic raindrop effect at Mexican Pyramids: the architects' homage to the rain god Chac?". Acta Acustica United with Acustica. 95 (5): 849–856. doi:10.3813/AAA.918216.
  64. ^ Declercq, Nico F.; Degrieck, Joris; Leroy, Oswald (2005). "Sound in Biased Piezoelectric Materials of General Anisotropy". Annalen der Physik. 14 (11–12): 705–722. Bibcode:2005AnP...517..705D. doi:10.1002/andp.200551711-1202.
  65. ^ Declercq, Nico F.; Polikarpova, Nataliya V.; Voloshinov, Vitaly B.; Leroy, Oswald; Degrieck, Joris (2006). "Enhanced anisotropy in Paratellurite for inhomogeneous waves and its possible importance in the future development of acousto-optic devices". Ultrasonics. 44 (Supplement 1): 833–837. doi:10.1016/j.ultras.2006.05.113. PMID 16793089.
  66. ^ Aguzzi, Jacopo; Flögel, Sascha; Marini, Simone; Thomsen, Laurenz; Albiez, Jan; Weiss, Peter; Picardi, Giacomo; Calisti, Marcello; Stefanni, Sergio; Mirimin, Luca; Vecchi, Fabrizio; Laschi, Cecilia; Branch, Andrew; Clark, Evan B.; Foing, Bernard; Wedler, Armin; Chatzievangelou, Damianos; Tangherlini, Michael; Purser, Autun; Dartnell, Lewis; Danovaro, Roberto (February 8, 2022). "Developing technological synergies between deep-sea and space research". Elementa: Science of the Anthropocene. 10 (1): 00064. Bibcode:2022EleSA..10...64A. doi:10.1525/elementa.2021.00064. hdl:10261/262473.
  67. ^ Voloshinov, Vitaly B.; Polikarpova, Nataliya V.; Declercq, Nico F. (2009). "Reflection of Plane Elastic Waves in Tetragonal Crystals with Strong Anisotropy". Journal of the Acoustical Society of America. 125 (2): 772–779. Bibcode:2009ASAJ..125..772V. doi:10.1121/1.3050307. PMID 19206854.
  68. ^ Sun, Cong; Chen, Zhi-jun; Tong, Rui; Xu, Hai-lin; Han, Chao (2015). "Theoretical modeling and experimental testing for SAW torque sensing". 2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA). pp. 120–124. doi:10.1109/SPAWDA.2015.7364454. ISBN 978-1-4799-8807-5.
  69. ^ Yang, Jiashi; Chen, Ziguang; Hu, Yuantai (2007). "Mass Sensitivity of Thickness-Twist Modes in a Rectangular Piezoelectric Plate of Hexagonal Crystals". IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. 54 (4): 882–887. Bibcode:2007ITUFF..54..882Y. doi:10.1109/TUFFC.2007.323. PMID 17441599.
  70. ^ Moiseyenko, R.P.; Herbison, S.; Declercq, Nico F.; Laude, V. (2012). "Phononic Crystal Diffraction Gratings". Journal of Applied Physics. 111 (3): 034907–034907–6. Bibcode:2012JAP...111c4907M. doi:10.1063/1.3682113.
  71. ^ Woods, Daniel C.; Bolton, J. Stuart; Rhoads, Jeffrey F. (2017). "Bounded inhomogeneous wave profiles for increased surface wave excitation efficiency at fluid-solid interfaces". Journal of the Acoustical Society of America. 141 (4): 2779–2787. Bibcode:2017ASAJ..141.2779W. doi:10.1121/1.4979595. PMID 28464622.
  72. ^ Physical Acoustics Best Paper Award, 144th Meeting of the Acoustical Society of America, Cancun, Mexico.
  73. ^ Declercq, Nico F.; Degrieck, Joris; Briers, Rudy; Leroy, Oswald (2003). "Theoretical verification of the backward displacement of waves reflected from an interface having superimposed periodicity". Applied Physics Letters. 82 (15): 2533–2534. Bibcode:2003ApPhL..82.2533D. doi:10.1063/1.1567043. hdl:1854/LU-348613.
  74. ^ Teklu, A.; Breazeale, M. A.; Declercq, Nico F. (2005). "Backward displacement of ultrasonic waves reflected from a periodically corrugated interface". Journal of Applied Physics. 97 (8): 084904–084904–4. Bibcode:2005JAP....97h4904T. doi:10.1063/1.1858880.
  75. ^ Herbison, Sarah W.; Declercq, Nico F.; Breazeale, Mack A. (2009). "Angular and frequency spectral analysis of the ultrasonic backward beam displacement on a periodically grooved solid". Journal of the Acoustical Society of America. 126 (6): 2939–2948. Bibcode:2009ASAJ..126.2939H. doi:10.1121/1.3243467. PMID 20000906.
  76. ^ a b Yin, XB; Hesselink, L; Liu, ZW; Fang, N; Zhang, X (2004). "Large positive and negative lateral optical beam displacements due to surface plasmon resonance". Applied Physics Letters. 85 (3): 372–374. Bibcode:2004ApPhL..85..372Y. doi:10.1063/1.1775294.
  77. ^ Bushuev, VA; Frank, AI (2018). "Goos-Hänchen effect in neutron optics and the reflection time of neutron waves". Physics-Uspekhi. 61 (10): 952–964. Bibcode:2018PhyU...61..952B. doi:10.3367/UFNe.2017.11.038235.
  78. ^ Chen, ZW; Yao, YW; Wu, FG; Zhang, X (2017). "The Schoch effect mechanism analysis and its regulation of two dimensional three components phononic crystal". Scientia Sinica-Physica Mechanica & Astronomica. 47 (6): 064301. Bibcode:2017SSPMA..47f4301C. doi:10.1360/SSPMA2016-00475.
  79. ^ Herbison, Sarah W.; Vander Weide, John M.; Declercq, Nico F. (2010). "Observation of ultrasonic backward beam displacement in transmission through a solid having superimposed periodicity". Applied Physics Letters. 97 (4): 041908. Bibcode:2010ApPhL..97d1908H. doi:10.1063/1.3469998.
  80. ^ Herbison, Sarah; Declercq, Nico F.; Breazeale, Mack A. (2009). "Angular and frequency spectral analysis of the ultrasonic backward beam displacement on a periodically grooved solid". Journal of the Acoustical Society of America. 126 (6): 2939–2948. Bibcode:2009ASAJ..126.2939H. doi:10.1121/1.3243467. PMID 20000906.
  81. ^ Miqoi, Nada (2023). Operando detection and quantification of damage in the automotive components made of polyamide-based composite reinforced with continuous fibers submitted to the fatigue-pre and/or post-impact by advanced ultrasonic techniques. HESAM University.
  82. ^ Pomarede, Pascal (2018). Investigation of PA66/6 composites subjected to low-velocity impact and fatigue loading. HESAM University.
  83. ^ de Castro D.S.V. Matvieieva N. Grosso M. Camerini C.G. Kotik H.G. Heuer H. (2021). "Evaluation of Mode II Delamination Area by Non-destructive Techniques: Accuracy and Influence on Fracture Toughness Calculation". Journal of Non-destructive Evaluation. 40 (3).
  84. ^ Shaw, Anurupa; Liu, Jingfei; Yoon, Suk Wang; Declercq, Nico F. (2016). "Characterization of the geometry of microscale periodic structures using acoustic microscopy". Ultrasonics. 70: 258–265. doi:10.1016/j.ultras.2016.05.015. PMID 27259118.
  85. ^ a b Mohamed, Esam T. Ahmed; Perone, Jean-Marc; Brand, Sebastian; Koegel, Michael; Declercq, Nico F. (2018). "Scanning acoustic microscopy comparison of Descemet's membrane normal tissue and tissue with Fuchs endothelial dystrophy (FECD)". Investigative Ophthalmology & Visual Science. 59 (13): 5627–5632. doi:10.1167/iovs.18-25516. PMID 30481279.
  86. ^ Jiang, WL; Liang, MX; Schiebel, M; Zaremba, S; Drechsler, K (2024). "Development of machine learning based classifier for the pressure test result prediction of type IV composite overwrapped pressure vessels". International Journal of Hydrogen Energy. 58: 380–388. Bibcode:2024IJHE...58..380J. doi:10.1016/j.ijhydene.2024.01.182.
  87. ^ Hu, CJ; Yang, B; Yang, LL; Wang, ZJ; Hu, WL (2023). "Anti-interference damage localization in composite overwrapped pressure vessels using machine learning and ultrasonic guided waves". NDT & E International. 140 102961. doi:10.1016/j.ndteint.2023.102961.
  88. ^ Dong, Junliang; Locquet, Alexandre; Declercq, Nico F.; Citrin, D.S. (2016). "Polarization-resolved terahertz imaging of intra- and inter-laminar damages in hybrid fiber-reinforced composite laminate subject to low-velocity impact". Composites Part B. 92: 167–174. doi:10.1016/j.compositesb.2016.02.016.
  89. ^ Dong, Junliang; Pomarède, Pascal; Chehami, Lynda; Locquet, Alexandre; Meraghni, Fodil; Declercq, Nico F.; Citrin, D. S. (2018). "Visualization of subsurface damage in woven carbon fiber-reinforced composites using polarization-sensitive terahertz imaging" (PDF). NDT & E International. 99: 72–79. doi:10.1016/j.ndteint.2018.07.001.
  90. ^ Dong, J.; Kim, Byungchil; Locquet, Alexandre; McKeon, Peter; Declercq, Nico F.; Citrin, D.S. (2015). "Nondestructive evaluation of forced delamination in glass fiber-reinforced composites by terahertz and ultrasonic waves" (PDF). Composites Part B. 79: 667–675. doi:10.1016/j.compositesb.2015.05.028.
  91. ^ Mohamed, Esam T. Ahmed; Pomarède, Pascal; Mangin, Pierre; Declercq, Nico F. (2023). "Ultrasonic testing of the biomechanical properties of donation blood". Biomedical Physics & Engineering Express. 9 (3): 035019. doi:10.1088/2057-1976/acc33b. PMID 36898150.
  92. ^ Mohamed, Esam T. Ahmed; Declercq, N. F. (2020). "Giga-Hertz ultrasonic microscopy: Getting over the obscurity: A review on the biomedical applications". Physics in Medicine. 9 100025. doi:10.1016/j.phmed.2020.100025.
  93. ^ Silitonga, Dicky; Declercq, Nico F. (2024). "Front glass crack inspection of thin-film solar photovoltaic modules using high-order ultrasonic Lamb waves". Solar Energy. 274 112578. Bibcode:2024SoEn..27412578S. doi:10.1016/j.solener.2024.112578. hdl:10985/25346.
  94. ^ "Reduction of CO2 Emissions: Major Progress in the Automotive Industry" (PDF). French Committee of Automobile Constructors (CCFA). April 2023. Retrieved 11 October 2024.
  95. ^ Declercq, Nico F.; Degrieck, Joris; Leroy, Oswald (2006). "Ultrasonic polar scans: numerical simulation on generally anisotropic media". Ultrasonics. 45 (1–4): 32–39. doi:10.1016/j.ultras.2006.05.219. PMID 16831454.
  96. ^ Declercq, Nico F.; Degrieck, Joris; Leroy, Oswald (2006). "Simulations of Harmonic and Pulsed Ultrasonic Polar Scans". NDT & E International. 39 (3): 205–216. doi:10.1016/j.ndteint.2005.07.004.
  97. ^ Chen, ZW; Yao, YW; Wu, FG; Zhang, X (2017). "The Schoch effect mechanism analysis and its regulation of two-dimensional three-component phononic crystals". Scientia Sinica-Physica Mechanica & Astronomica. 47 (6): 064301. Bibcode:2017SSPMA..47f4301C. doi:10.1360/SSPMA2016-00475.
  98. ^ Liang, MS; Yu, GK; Wang, L; Peng, LH (2023). "Excitation of Scholte Waves at a Sinusoidal Interface of Seafloor". Journal of Theoretical and Computational Acoustics. 31 (2): 2350005. doi:10.1142/S2591728523500056.
  99. ^ Declercq, Nico F.; Leroy, Oswald; Degrieck, Joris; Vandeputte, Jeroen (2004). "The interaction of inhomogeneous waves and Gaussian beams with mud in between a hard solid and an ideal liquid". Acta Acustica United with Acustica. 90: 819–829.
  100. ^ Schaal, C; Granados, R; Barrett, M (2024). "Automated transducer deployment for Lamb wave-based nondestructive evaluation of plates". In Rizzo, Piervincenzo; Su, Zhongqing; Ricci, Fabrizio; Peters, Kara J. (eds.). Health Monitoring of Structural and Biological Systems XVIII. Vol. 12951. p. 1295117. Bibcode:2024SPIE12951E..17S. doi:10.1117/12.3009829. ISBN 978-1-5106-7208-6.
  101. ^ Zou, H; Wu, SY; Xue, QT; Sun, XY (2024). "VB-T PHD-SLAM: efficient SLAM under heavy-tailed noise". Advanced Robotics. 38 (15): 1093–1105. doi:10.1080/01691864.2024.2384425.
  102. ^ Ouabi, OL; Zeghidour, N; Declercq, NF (2023). "Pose-graph SLAM Using Multi-order Ultrasonic Echoes and Beamforming for Long-range Inspection Robots". 2023 IEEE International Conference on Robotics and Automation (ICRA). pp. 10623–10629. doi:10.1109/ICRA48891.2023.10161265. ISBN 979-8-3503-2365-8.
  103. ^ de Montisalbi, Ernesto (2023). Demitasse Chastity. Amazon. ISBN 979-8-3724-1031-2.
  104. ^ de Montisalbi, Ernesto (2024). Grievous Reminiscence. Amazon. ISBN 979-8-8775-2337-1.
  105. ^ On the final page of his poetry collections, Ernesto de Montisalbi revealed that his real name is Nico F. Declercq.
  106. ^ de Montisalbi, Ernesto (2024). Heart Embers. Amazon. ISBN 979-8-3412-5525-8.
  107. ^ de Montisalbi, Ernesto (2024). Light Whispers. Amazon. ISBN 979-8-3412-5778-8.
  108. ^ de Montisalbi, Ernesto (2024). Soul Sparks. Amazon. ISBN 979-8-3412-5696-5.
  109. ^ Declercq, Nico F. (2024). The Desclergues of la Villa Ducal de Montblanc, Second Edition Omnibus. Nico F. Declercq. ISBN 978-90-831769-4-9.
  110. ^ Nico F. Declercq, "Ultraviolet light used in a historical case study of 1639," 6th International Workshop on Ultraviolet Materials and Devices, IWUMD VI, Metz, France, June 5–7, 2023.
  • Media related to Nico Declercq at Wikimedia Commons
  • Official website
  • Publications by Nico F. Declercq at ResearchGate
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