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Journal articles on the topic 'Photo acoustic analysis'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Burbelo, R. "Photo-thermo-acoustic analysis of heterogeneous semiconductor structures under pulse laser irradiation." Semiconductor Physics Quantum Electronics and Optoelectronics 14, no. 2 (2011): 167–69. http://dx.doi.org/10.15407/spqeo14.02.167.

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Votintsev, Alexey P., Alexey V. Borisov, Didar R. Makashev, Mariya Y. Stoyanova, and Yury V. Kistenev. "Quartz-Enhanced Photoacoustic Spectroscopy in the Terahertz Spectral Range." Photonics 10, no. 7 (2023): 835. http://dx.doi.org/10.3390/photonics10070835.

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Infrared laser photo-acoustic spectroscopy provides very high sensitivity of a gas sample analysis when high-power tunable laser radiation sources and resonant photo-acoustic detectors (PADs) are used. In the resonant PAD, the acoustic signal generated by absorbed laser radiation in a measurement chamber is amplified proportionally to a Q-factor of the acoustic resonator. But, compact tunable high-power lasers (with power above 100 mW) still are not widely spread in the terahertz spectral range. One of the ways to achieve an acceptable sensitivity of terahertz photo-acoustic spectroscopy is us

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Nikolic, M. V., D. Lukovic, S. Savic, V. Blagojevic, and Pantelija Nikolic. "Investigation of sintering kinetics of NiO using photo acoustic spectroscopy." Science of Sintering 36, no. 3 (2004): 165–70. http://dx.doi.org/10.2298/sos0403165n.

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Sintering kinetics of NiO was investigated using photo acoustic spectroscopy This method was used to follow the change of phase and amplitude of the photo acoustic signal of nickel-oxide samples sintered at 1373 K for 15-240 min. as a function of modulation frequency of the laser beam. Fitting of experimental data enabled determination of photo acoustic properties including thermal diffusivity of sintered nickel-oxide. Analysis of the change of sample density during sintering showed that the sintering process of this material can be observed from the viewpoint of activated volume and the chang

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Stepanov, A. A. "ON THE DISCRETE LINEAR ILL‐POSED PROBLEMS." Mathematical Modelling and Analysis 4, no. 1 (1999): 147–52. http://dx.doi.org/10.3846/13926292.1999.9637119.

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An inverse problem of photo‐acoustic spectroscopy of semiconductors is investigated. The main problem is formulated as the integral equation of the first kind. Two different regularization methods are applied, the algorithms for defining regularization parameters are given.

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Ghandriche, Ahcene, and Mourad Sini. "Photo-acoustic inversion using plasmonic contrast agents: The full Maxwell model." Journal of Differential Equations 341 (December 2022): 1–78. http://dx.doi.org/10.1016/j.jde.2022.09.008.

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Chen, Kejun, Muyu Yi, Fan Gao, Xiang Zhang, and Xiao Yuan. "Laser-Induced Damage on Fused Silica With Photo-Acoustic Spectrum Analysis." IEEE Photonics Technology Letters 31, no. 10 (2019): 787–90. http://dx.doi.org/10.1109/lpt.2019.2908004.

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Baddour, Natalie. "A multi-dimensional transfer function approach to photo-acoustic signal analysis." Journal of the Franklin Institute 345, no. 7 (2008): 792–818. http://dx.doi.org/10.1016/j.jfranklin.2008.04.010.

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Bayrakli, Ismail, Hatice Akman, and Filiz Sari. "Sensor using a photo-acoustic absorption cell with two perpendicular acoustic resonators to analyze multiple molecules." Applied Optics 62, no. 25 (2023): 6689. http://dx.doi.org/10.1364/ao.495411.

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An ultra-high sensitivity multi-molecule sensor based on a photo-acoustic cell with two perpendicular acoustic resonators and a common microphone has been reported. In this work, a 4.5 µm distributed-feedback quantum cascade laser and a 1.5 µm external cavity diode laser (EC-DL) were used as optical excitation sources. Considering the spectral ranges of the lasers used, it is possible to analyze eight molecules (QCL:N2O and CO2, EC-DL: H2O, H2S, NH3, CO, CH4, and C2H2). The N2O molecule was used to evaluate the performance of the photo-acoustic spectroscopy (PAS)-based sensor. A sensitivity of

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Чинь, Куанг, Quang rinh, Хоай Нгуен, and Hoai Nguyen. "A numerical simulation of multi-spectral photo-acoustic imaging toward hematological analysis." Международный журнал "Программные продукты и системы" 32 (August 22, 2016): 90–95. http://dx.doi.org/10.15827/0236-235x.115.090-095.

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Putra, Giar Pramanda, Ratna Ratna, and Agus Arip Munawar. "Uji Performansi Instrument Berbasis Teknologi Laser Photo-Accoustics Untuk Deferensiasi Kopi." Jurnal Ilmiah Mahasiswa Pertanian 4, no. 1 (2019): 618–27. http://dx.doi.org/10.17969/jimfp.v4i1.10282.

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Abstrak. Penelitian ini bertujuan untuk memanfaatkan instrument berbasis teknologi Laser Photo Acoustics untuk membedakan biji kopi berdasarkan perbedaan daerah dan jenis kopi. Penelitian ini menggunakan softwere The Unscrambler X 10.5 Parameter penelitian meliputi penggunaan metode PCA (partial component analysis( dengan mengguanakan pretreatment baseline correction dan klasifikasi biji kopi beserta perbedaan daerah penghasil kopi dengan total 40 sampel tembakan laser antara lain 20 sampel biji kopi arabika dan 20 sampel biji kopi robusta. Hasil penelitian menunjukkan bahwa uji performansi al

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Viola, Roberto, Nicola Liberatore, and Sandro Mengali. "Additively Manufactured Detection Module with Integrated Tuning Fork for Enhanced Photo-Acoustic Spectroscopy." Sensors 22, no. 19 (2022): 7193. http://dx.doi.org/10.3390/s22197193.

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Starting from Quartz-Enhanced Photo-Acoustic Spectroscopy (QEPAS), we have explored the potential of a tightly linked method of gas/vapor sensing, from now on referred to as Tuning-Fork-Enhanced Photo-Acoustic Spectroscopy (TFEPAS). TFEPAS utilizes a non-piezoelectric metal or dielectric tuning fork to transduce the photoacoustic excitation and an optical interferometric readout to measure the amplitude of the tuning fork vibration. In particular, we have devised a solution based on Additive Manufacturing (AM) for the Absorption Detection Module (ADM). The novelty of our solution is that the A

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Chen, Lung-Hui. "An inverse spectral analysis of transmission problem in thermo- and photo-acoustic tomography." Waves in Random and Complex Media 29, no. 2 (2018): 204–14. http://dx.doi.org/10.1080/17455030.2017.1422605.

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13

Sumie, Shingo, Hiroyuki Takamatsu, Tsutomu Morimoto, et al. "Analysis of lattice defects induced by ion implantation with photo‐acoustic displacement measurements." Journal of Applied Physics 76, no. 10 (1994): 5681–89. http://dx.doi.org/10.1063/1.357074.

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Wang, Jinchao, Junfeng Huang, Hui Min, Feng Wang, Yiteng Wang, and Zengqiang Han. "Study on the Weak Interlayer Identification Method Based on Borehole Photo-Acoustic Combined Measurement: Application to a Landslide Case Study." Applied Sciences 12, no. 20 (2022): 10545. http://dx.doi.org/10.3390/app122010545.

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A weak interlayer is the key factor in controlling slope stability. It is of great significance to effectively identify the weak interlayer in the study of spatial and temporal distribution law and the internal structure characteristics of a landslide. Considering the limitations of traditional optical imaging and wave speed test methods, this paper presents a weak interlayer identification method based on borehole photo-acoustic combination measurement. By using the combination of optical imaging and acoustic wave scanning, the multi-source data collection of borehole rock wall and borehole s

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Scudieri, F., M. Marinelli, U. Zammit, and S. Martellucci. "Photo-acoustic analysis of first- and higher-order phase transitions in 8CB liquid crystal." Journal of Physics D: Applied Physics 20, no. 8 (1987): 1045–48. http://dx.doi.org/10.1088/0022-3727/20/8/009.

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Arndt, Christoph, Anna-Lena Sahlberg, Anil Patnaik, et al. "Laser Applications to Chemical, Security, and Environmental Analysis: introduction to the feature issue." Applied Optics 62, no. 6 (2023): LAC1. http://dx.doi.org/10.1364/ao.487814.

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The eighteenth topical meeting on Laser Applications to Chemical, Security, and Environmental Analysis (LACSEA) was held in Vancouver, Canada from 11–15 July 2022, as part of the Optica Optical Sensors and Sensing Congress in a hybrid format allowing on-site and online attendance. The meeting featured a broad range of distinguished papers focusing on recent advances in laser and optical spectroscopy. A total of 52 contributed and invited papers were presented during the meeting, including topics such as photo-acoustic spectroscopy, imaging, non-linear technologies, frequency combs, remote sens

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Calderan, SV, A. Black, TA Branch, et al. "South Georgia blue whales five decades after the end of whaling." Endangered Species Research 43 (November 19, 2020): 359–73. http://dx.doi.org/10.3354/esr01077.

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Blue whales Balaenoptera musculus at South Georgia were heavily exploited during 20th century industrial whaling, to the point of local near-extirpation. Although legal whaling for blue whales ceased in the 1960s, and there were indications of blue whale recovery across the wider Southern Ocean area, blue whales were seldom seen in South Georgia waters in subsequent years. We collated 30 yr of data comprising opportunistic sightings, systematic visual and acoustic surveys and photo-identification to assess the current distribution of blue whales in the waters surrounding South Georgia. Over 34

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Maurin, Nicolas, Roman Rousseau, Wioletta Trzpil, et al. "First clinical evaluation of a quartz enhanced photo-acoustic CO sensor for human breath analysis." Sensors and Actuators B: Chemical 319 (September 2020): 128247. http://dx.doi.org/10.1016/j.snb.2020.128247.

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Paola, Agata Irene Di, Michelle Gelippi, and Monica Francesca Blasi. "First Photo-Identification Study of the Sperm Whale (Physeter macrocephalus) in the Aeolian Archipelago and the Northern Coast of Sicily (Southern Tyrrhenian Sea, Italy)." Diversity 17, no. 3 (2025): 147. https://doi.org/10.3390/d17030147.

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(1) While photo-identification has been used to study sperm whales worldwide, no long-term photo-id studies are available from the Southern Tyrrhenian Sea for the Mediterranean endangered population. (2) Here, sperm whale occurrence, group size, and the type of encounters were investigated around the Aeolian archipelago (Southern Italy) by photo-ID data collected between 2013 and 2024. Data were obtained through dedicated boat surveys and recreational sailors’ reports. (3) During 58 sighting events, 125 sperm whales were encountered, 60 of whom were photo-identified and cataloged. Of these, tw

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L., Jayanthi1 &. N. Prabavathi*2. "NONLINEAR OPTICAL PROPERTIES OF METHANE SULPHONYL MORPHOLINE (MSM) SINGLE CRYSTALS GROWN BY CONVENTIONAL AND SANAKARANARAYANAN-RAMASAMY METHOD." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 6, no. 10 (2017): 191–207. https://doi.org/10.5281/zenodo.1002707.

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The growth and properties of Methane Sulphonyl Morpholine (MSM) organic single crystal, is reported. MSM crystals were grown by Conventional and Sankaranarayanan-Ramasamy (SR) method. The grown crystals have been characterized for their structural, optical, mechanical, dielectric, laser damage threshold, Photo acoustic, thermal and NLO properties. The results of Conventional and SR method have been compared. It has been observed that the SR method grown crystal have enhanced properties throughout the studies and this observation revealed improved quality of the crystals that give a positive ap

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Brown, Steven D., Ava Kanyeredzi, Laura McGrath, Paula Reavey, and Ian Tucker. "Organizing the sensory: Ear-work, panauralism and sonic agency on a forensic psychiatric unit." Human Relations 73, no. 11 (2019): 1537–62. http://dx.doi.org/10.1177/0018726719874850.

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How are relations of care and security between hospital staff and patients organized through sound? This article argues that a shifting distinction between meaningful sound and noise is fundamental to the lived experience of immersion in an organizational acoustic environment. Based around a qualitative study of listening practices and ‘ear-work’ at a medium-secure forensic psychiatric hospital, using interview and photo-production methods, the article positions the organizing of the sensory as central to formal organization. Analysis of empirical material demonstrates how the refinement of ke

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22

Domenighini, P., A. M. Gambelli, F. Rossi, and F. Cotana. "Hydrogen production by water photo-sonolysis: a modal approach to enhance the ultrasonic acoustic field in the solution." Journal of Physics: Conference Series 2648, no. 1 (2023): 012059. http://dx.doi.org/10.1088/1742-6596/2648/1/012059.

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Abstract Water photo-sonolysis is considered one of the most innovative ways of hydrogen production. Cited by the Italian strategy on hydrogen research as a promising field for innovation research, it consists of the coupling work of solar-light electromagnetic waves and mechanical ultrasonic waves to induce water splitting. Water photolysis requires catalysts to be performed and optimized, whereas ultrasound sonolysis acts independently. In the state of the art, it was experimentally demonstrated that the rates of hydrogen production by sonolysis rise according to resonance peaks of the solut

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Saidov, B. B., and V. F. Telezhkin. "OPTO-ULTRASONIC COMMUNICATION CHANNELS." Bulletin of the South Ural State University. Ser. Computer Technologies, Automatic Control & Radioelectronics 20, no. 4 (2020): 55–62. http://dx.doi.org/10.14529/ctcr200406.

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Ultrasound is widely used in various applications, such as monitoring the state of structures, biomed-ical ultrasound imaging, and information (data) transmission. Ultrasonic transceivers are one of the modern communication systems, both for short-range and remote access. Indeed, the technology of the process of transmitting information using communication channels based on ultrasonic (US) vi-brations and the physical implementation of transmission using optical fiber are widely used in con-ditions of confidentiality of data processing. At the same time, the needs of wireless and wired communi

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Gao, Guodong, and Yongming Xing. "Synergetics and Acoustic Emission Approach for Crazing Nonlinear Dynamical Systems." International Journal of Bifurcation and Chaos 30, no. 03 (2020): 2050043. http://dx.doi.org/10.1142/s0218127420500431.

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This paper reports that synergetics are used to analyze the crazing evolution. On this basis, chaotic effect is explored. The chaos equation is established and verified. The theoretical derivation are consistent with the experimental results. We design a special specimen with a special loading mode, the transient monitoring function of acoustic emission (AE) technology is used to track and detect the crazing inside the PMMA in real time, and the experiments show that synergetics can explain the crazing properties of polymer. Importantly, the mathematical explanation is also given. The AE analy

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Joshi, Kunal, Spandan Mishra, Chris Campbell, Tarik Dickens, and Arda Vanli. "Light emitting composite beams during matrix cracking." Journal of Composite Materials 51, no. 30 (2017): 4251–60. http://dx.doi.org/10.1177/0021998317701556.

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Defects in fiber-reinforced composite structures tend to initiate unpredictably and unalarmed due to local stress concentrations within a composite structure; this has given rise to active monitoring techniques that can quantify the mechanical stress within composites in order to evaluate the structural health. In this paper, triboluminescent mechanisms are used for damage monitoring of composite matrix under flexural loading. Vinyl ester resin is doped with ZnS:Mn phosphors and reinforced with glass fiber whiskers, were subjected to flexural loading while observing both the triboluminescent a

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Barr, William. "Identification of the Franklin expedition wreck." Polar Record 51, no. 2 (2014): 218. http://dx.doi.org/10.1017/s0032247414000904.

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The wreck discovered by the Victoria Strait expedition in early September (Barr 2014) has now been positively identified as that of HMS Erebus. This identification was based on a thorough analysis of the acoustic imagery (side-scan and multi-beam sonar),comparison with the plans for both Erebus and Terror from the National Maritime Museum, Greenwich, visual measurements made during inspection dives by Parks Canada personnel on the site (particularly with regard to the 1845 modifications to the stern), as well as certain telling details which were captured with photo and video. The fact that Er

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MILOCH, W. J., V. L. REKAA, H. L. PÉCSELI, and J. TRULSEN. "Ion acoustic double layers forming behind irradiated solid objects in streaming plasmas." Journal of Plasma Physics 76, no. 3-4 (2010): 429–39. http://dx.doi.org/10.1017/s002237780999064x.

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AbstractSmall solid metallic objects in relative motion to thermal plasmas are studied by numerical simulations. We analyze supersonic motions, where a distinctive ion wake is formed behind obstacles. At these plasma drift velocities, ions enter the wake predominantly due to deflections by the electric field in the sheath around the obstacle. By irradiating the back side of the object by ultraviolet (UV) light, we can induce also an enhanced photo-electron population there. The resulting charge distribution gives rise to a pronounced local potential and plasma density well behind the object. T

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Mihelič, Miha, and Miha Krofel. "New records of the golden jackal (Canis aureus L.) in the upper Soča valley, Slovenia." Natura Sloveniae 14, no. 2 (2012): 51–63. http://dx.doi.org/10.14720/ns.14.2.51-63.

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Golden jackals (Canis aureus) have been recorded in the Slovenian Julian pre-Alps for more than 50 years. In recent years, however, a substantial increase in sightings of golden jackalshas been recorded in the area around the town of Bovec. During the present study we gathered information through interviews with local hunters and other residents and conducted a basic questionnaire on their opinion about this expanding carnivore. In addition, we performed monitoring of jackals with the use of acoustic playback method, photo-traps and searching for footprints and other signs of jackal presence.

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Ramli, Ichwana, Agus Arip Munawar, and Khairul Abdi Ruslana. "PREDIKSI CEPAT KUALITAS AIR MENGGUNAKAN LPAS (LASER PHOTO-ACOUSTIC SPECTROSCOPY) DENGAN MENERAPKAN METODE KOREKSI CUTTING EDGE FILTERING." Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) 10, no. 2 (2021): 220. http://dx.doi.org/10.23960/jtep-l.v10i2.220-227.

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A tool that can predict water quality by capturing sound vibrations generated by collisions between water samples and light is LPAS (Laser Photo-Acoustic Spectroscopy). To process the data acquired by LPAS, spectrum correction is needed to eliminate data errors when making acquisitions on water samples. The correction method used in this research is the cutting edge filtering correction method. The regression model that can be used is the PLSR (Partial Least Square Regression) regression model. This research was conducted in the Instrumentation and Energy Laboratory, Agricultural Engineering S

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Marini, Leonardo, Susanna Marini, James Cutlan, and Irena Hreljac. "Q-S laser micro-drilling and multipass full-beam Q-S laser for tattoo removal — a case series." Lasers in Medical Science 37, no. 3 (2021): 1763–71. http://dx.doi.org/10.1007/s10103-021-03431-w.

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Abstract The purpose of this study was to evaluate the safety and efficacy of a new combined method of Q-S laser-assisted tattoo removal. Ten patients with 13 professional, mostly mono-chromatic black tattoos were recruited. All tattoos received the same Q-S laser treatment sequence. An objective evaluation of tattoo clearing was assessed by careful analysis of a standardized collection of digital images taken from each tattoo, 2 months after each laser session, with the help of a custom-made pigment-fading percentage photographic ruler. The percentages of pigment clearance and side effects we

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GOLD, Martin, Gary SIEBEIN, and Keely SIEBEIN. "Soundscape Architecture: conceptual proposals for improving the urban soundscape through building in Fort Lauderdale, FL." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 270, no. 9 (2024): 2451–62. http://dx.doi.org/10.3397/in_2024_3185.

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Architecture students from the University of Florida School of Architecture developing architectural and planning strategies in response to citizen generated initiative to improve the soundscape at multiple locations in Fort Lauderdale Florida. Site analysis including citizen participation in sound walks, personal observations, photo documentation, precedent studies, acoustic measurements, geographical measurements, and municipal code studies was conducted. This information informed conceptual and schematic design proposals for urban architecture (buildings), at critical locations in the urban

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Kasireddy, Nithya, Elizabeth M. Cummins, Huy Q. Pham, Amina Rafique, and Damir B. Khismatullin. "Small-Volume Noncontact Assessment of Blood Coagulation Via Acoustic Tweezing Coagulometry." Blood 138, Supplement 1 (2021): 3178. http://dx.doi.org/10.1182/blood-2021-153819.

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Abstract Introduction: Blood coagulation analysis is routinely performed to assess bleeding and thrombotic risks in surgical and critical care patients as well as in patients with diseases that cause coagulation abnormalities (e.g., hemophilia, thrombophilia and sickle cell disease). Majority of coagulation assays are based on photo-optical measurement of coagulation onset in blood plasma such as prothrombin time (PT), international normalized ratio (INR), and activated partial thromboplastin time (aPTT) and viscoelastic measurement of coagulating whole blood, often referred to as "global coag

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Romeo, Saverio, Antonio Cosentino, Francesco Giani, Giandomenico Mastrantoni, and Paolo Mazzanti. "Combining Ground Based Remote Sensing Tools for Rockfalls Assessment and Monitoring: The Poggio Baldi Landslide Natural Laboratory." Sensors 21, no. 8 (2021): 2632. http://dx.doi.org/10.3390/s21082632.

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Nowadays the use of remote monitoring sensors is a standard practice in landslide characterization and monitoring. In the last decades, technologies such as LiDAR, terrestrial and satellite SAR interferometry (InSAR) and photogrammetry demonstrated a great potential for rock slope assessment while limited studies and applications are still available for ArcSAR Interferometry, Gigapixel imaging and Acoustic sensing. Taking advantage of the facilities located at the Poggio Baldi Landslide Natural Laboratory, an intensive monitoring campaign was carried out on May 2019 using simultaneously the HY

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Ryan, John P., William K. Oestreich, Kelly J. Benoit-Bird, et al. "Audible changes in marine trophic ecology: Baleen whale song tracks foraging conditions in the eastern North Pacific." PLOS ONE 20, no. 2 (2025): e0318624. https://doi.org/10.1371/journal.pone.0318624.

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Among tremendous biodiversity within the California Current Ecosystem (CCE) are gigantic mysticetes (baleen whales) that produce structured sequences of sound described as song. From six years of passive acoustic monitoring within the central CCE we measured seasonal and interannual variations in the occurrence of blue (Balaenoptera musculus), fin (Balaenoptera physalus), and humpback (Megaptera novaeangliae) whale song. Song detection during 11 months of the year defines its prevalence in this foraging habitat and its potential use in behavioral ecology research. Large interannual changes in

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NARRETO, M. A. B., K. WEI, R. ABD-SHUKOR, and H. A. ALWI. "THERMAL DIFFUSIVITY OF Bi2Sr2CaCu2O8 CERAMICS WITH NANO Ag ADDITION MEASURED USING OPEN-CELL PHOTOACOUSTIC TECHNIQUE." Modern Physics Letters B 22, no. 30 (2008): 3015–23. http://dx.doi.org/10.1142/s0217984908017473.

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This paper reports the results of thermal diffusivity measurement on nano Ag added Bi 2 Sr 2 CaCu 2 O 8- Ag x (with x = 0–1.0) ceramics using an open-cell photoacoustic instrument. The thermal diffusivities were obtained by analyzing the phase of the photo-acoustic signal of thermally thick samples using Calderon's method as well as the analysis of the phase in thermally thick region. We found that the thermal diffusivity increases with the amounts of nano Ag . The values of thermal diffusivity obtained were between 0.01250 ± 0.00128 to 0.01606 ± 0.00230 cm 2/ s for Ag 0 to Ag 1.0. The electri

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Puchkova, A. N., O. N. Tkachenko, I. P. Trapeznikov, et al. "Assessment of potential capabilities of Dreem: An ambulatory device for EEG phase-locked acoustic stimulation during sleep." SOCIALNO-ECOLOGICHESKIE TECHNOLOGII 9, no. 1 (2019): 96–112. http://dx.doi.org/10.31862/2500-2961-2019-9-1-96-112.

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Sleep disorders are one of the significant problems in the modern society. Current research is on the lookout for the nonpharmacological ways to improve sleep quality and slow wave brain activity that plays a crucial role in homeostasis and cognitive functions. One of the promising approaches is acoustic stimulation that is phase-locked to deep sleep EEG rhythms. It was already shown that such stimulation improves slow wave brain activity. This article describes Dreem: a wireless consumer device that performs acoustic sleep stimulation in home conditions. The device has dry EEG electrodes, pho

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Rousseau, Roman, Nicolas Maurin, Wioletta Trzpil, Michael Bahriz, and Aurore Vicet. "Quartz Tuning Fork Resonance Tracking and application in Quartz Enhanced Photoacoustics Spectroscopy." Sensors 19, no. 24 (2019): 5565. http://dx.doi.org/10.3390/s19245565.

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The quartz tuning fork (QTF) is a piezoelectric transducer with a high quality factor that was successfully employed in sensitive applications such as atomic force microscopy or Quartz-Enhanced Photo-Acoustic Spectroscopy (QEPAS). The variability of the environment (temperature, humidity) can lead to a drift of the QTF resonance. In most applications, regular QTF calibration is absolutely essential. Because the requirements vary greatly depending on the field of application, different characterization methods can be found in the literature. We present a review of these methods and compare them

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Walther, Andreas, Lars Rippe, Lihong V. Wang, Stefan Andersson-Engels, and Stefan Kröll. "Analysis of the potential for non-invasive imaging of oxygenation at heart depth, using ultrasound optical tomography (UOT) or photo-acoustic tomography (PAT)." Biomedical Optics Express 8, no. 10 (2017): 4523. http://dx.doi.org/10.1364/boe.8.004523.

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Shupov, Vitalii, Mykola Zhukov, Andrii Pyrozhenko, Vitalii Tsvitnov та Ruslan Shaida. "Застосування ультразвуку для винаходження небезпечних заколов і відшланень у покрівлі і стінках підземних гірничих виробок". Economics and technical engineering 1, № 2 (2023): 143–52. http://dx.doi.org/10.62911/ete.2023.01.02.11.

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It has been shown that there is a high incidence of injuries to mountain workers due to falling pieces of rock in underground mining pits. From the published materials it is clear that in deep ore mines, on average, 40% of all injuries on mining robots are mainly caused by falls from invisible pins and scrapes in the walls and walls of mining machines. Increasing productivity works under the influence of a stronger environment. The main way to identify potential stains is by tapping the surface of the oil mass, as the frill is called, which is associated with a forceful infusion onto the mass

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Li, Zhiyi, Ihtesham Ur Rehman, Rebecca Shepherd, and Timothy E. L. Douglas. "Generation of Pearl/Calcium Phosphate Composite Particles and Their Integration into Porous Chitosan Scaffolds for Bone Regeneration." Journal of Functional Biomaterials 15, no. 3 (2024): 55. http://dx.doi.org/10.3390/jfb15030055.

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Bone tissue engineering using osteoconductive scaffolds holds promise for regeneration, with pearl powder gaining interest for its bioactive qualities. This study used freeze drying to create chitosan (CS) scaffolds with pearl/calcium phosphate (p/CaP) powders, mimicking bone tissue structurally and compositionally. Characterization included scanning electron microscopy (SEM) and mechanical testing. X-ray diffraction (XRD) Fourier-transform infrared–photoacoustic photo-acoustic sampling (FTIR−PAS), and FTIR- attenuated total reflectance (FTIR-ATR) were used to characterize p/CaP. In vitro test

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D’Urso, Provvidenza Rita, Claudia Arcidiacono, and Giovanni Cascone. "Analysis of the Horizontal Distribution of Sampling Points for Gas Concentrations Monitoring in an Open-Sided Dairy Barn." Animals 12, no. 23 (2022): 3258. http://dx.doi.org/10.3390/ani12233258.

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In the livestock sector, the monitoring of gas concentrations plays a relevant role in the implementation of mitigation strategies, as well as the improvement in the indoor air quality for both workers and animals in barns. In the present study, measurements of gas concentrations (NH3, CH4, and CO2) at different locations were carried out in an open dairy barn using a commercial photo-acoustic spectroscopy system. Measurement variability for different datasets was computed to contribute to the evaluation of the sampling strategy in the measurement campaign. The results showed that the position

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Ichwana, Ichwana, Zulkifli Nasution, and Agus Arip Munawar. "The Application of Fourier Transform Infrared Photoacoustics Spectroscopy (FTIR-PAS) for Rapid Soil Quality Evaluation." Rona Teknik Pertanian 10, no. 1 (2017): 1–10. http://dx.doi.org/10.17969/rtp.v10i1.6984.

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Abstrak. Tanah merupakan media tumbuh tanaman dan berperan dalam menjaga keseimbangan alam. Evaluasi kualitas dan kesuburan tanah menjadi hal penting dan merupakan pekerjaan rutin pada crop management system. Untuk memonitor dan menentukan kualitas tanah, beberapa metode telah diterapkan. Akan tetapi, metode tersebut berbasis pengukuran laboratorium yang melibatkan bahan kimia, memerlukan waktu yang lama dan kurang efektif pada aplikasinya. Infrared spectroscopy muncul sebagai salah satu teknologi yang cepat, simultan dan ramah lingkungan untuk digunakan dalam evaluasi kualitas dan kesuburan t

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Sarode, A. P., and O. H. Mahajan. "Displacement fields of a Cuboid crystal in a Photoacoustic Cell: Mathematical aspects." Bulletin of the Karaganda University. "Physics" Series 101, no. 1 (2021): 6–11. http://dx.doi.org/10.31489/2021ph1/6-11.

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Photo acoustic effect is popular due to a minimal sample preparation during execution, the ability to examine scattering and opaque sample along with the capability to access depth profile. These features enable Photoacoustic spectroscopy to be used in depth-resolved characterization of solids. Thermal interaction is a basic perspective in solid state physics research regarding industrial devices and components. It is a key factor of fabrication and performance of such devices and components. Today, crystalline solids are widely studied due to their wide scientific and industrial applications.

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Kundrotaitė, Aušra. "Spatiality of the City in Literature: Possibilities and Limits of the Semiotic Approach." Respectus Philologicus, no. 37(42) (April 20, 2020): 170–82. http://dx.doi.org/10.15388/respectus.2020.37.42.48.

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The article attempts to delineate adequate ways of thinking about the spatiality of the city in literature. It examines two semiotic approaches to the problematic of the city, namely Jurij Lotman’s semiotics of culture and Algirdas Julius Greimas’ urban semiotics, and their applicability to the analysis of its literary representation. Lotman’s concept of semiosphere is invoked to outline the complex, two-way relationship between consciousness and the city. Highlighting the communicative and autocommunication processes of culture helps to establish a link with Greimas’ interpretive and generati

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García-Cegarra, Ana M. "Evidence of Type A-Like Killer Whales (Orcinus orca) Predating on Marine Mammals Along the Atacama Desert Coast, Chile." Aquatic Mammals 48, no. 5 (2022): 436–48. http://dx.doi.org/10.1578/am.48.5.2022.436.

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Killer whales (Orcinus orca) are marine apex predators distributed across the world’s oceans. In the last 40 years, researchers have increasingly differentiated killer whales into ecotypes based on genetics, morphology, behaviour, acoustic repertoire, habitat, and trophic ecology. While killer whale ecotypes in the Northern Hemisphere are well studied, the recognition of distinct killer whale forms in the Southern Hemisphere is mainly limited to Antarctic waters. Although present in less studied regions, such as along the Atacama Desert coast in the Southeast Pacific Ocean, limited information

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Ootake, Yoshisato, and Serge Kokot. "Discrimination between Glutinous and Non-Glutinous Rice by Vibrational Spectroscopy. I: Comparison of FT-NIR DRIFT, PAS and Raman Spectroscopy." Journal of Near Infrared Spectroscopy 6, no. 1 (1998): 241–49. http://dx.doi.org/10.1255/jnirs.143.

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Rice is a major cereal crop in Japan and in Asia. Its taste is determined by such factors as protein and water content as well as stickiness. It has been well established that protein and water content can be estimated by near infrared spectroscopic measurements. However, the measurement of amylose content, which is closely related to rice stickiness, at present, must be carried out by wet chemical methods. Vibrational spectroscopic techniques are possible alternative approaches for the determination of amylose content in rice and, in this paper, we report on the initial steps for the developm

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Burnham, Rianna E., and David A. Duffus. "A Multi-Dimensional Examination of Foraging Habitat Use by Gray Whales Using Long Time-Series and Acoustics Data." Animals 12, no. 20 (2022): 2735. http://dx.doi.org/10.3390/ani12202735.

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Gray whales (Eschrichtius robustus) show high site fidelity to feeding and breeding areas. The whales’ annual cycle could be learned or be driven by factors such as prey abundance or ocean conditions. Long-term line transect and photo-identification data were analyzed to consider intra- and inter- annual patterns of habitat use and the underlying drivers for foraging areas in Clayoquot Sound, British Columbia. Time series, autocorrelation and weighted means analysis were used on the 20-years of data (1997–2016). A generalized additive model showed that whale use of the area was most strongly i

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Franklin, Wally, Trish Franklin, Sal Cerchio, et al. "Photo-identification comparison of humpback whale (Megaptera novaeangliae) flukes from Antarctic Area IV with fluke catalogues from East Africa, Western Australia and Eastern Australia." J. Cetacean Res. Manage. 17, no. 1 (2023): 1–7. http://dx.doi.org/10.47536/jcrm.v17i1.425.

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Early ‘Discovery mark’ data together with recent photo-identification, acoustic, genetic and satellite-radio tag data revealed linkages between humpback whales migrating from breeding grounds (C) off East Africa and the Area III feeding area, from Western Australian breeding grounds (D) and the Antarctic Area IV feeding area and the East Australian breeding grounds (E1) and Antarctic Area V feeding area. These data also revealed low levels of intermingling between (E1) and (D) humpback whales in the Antarctic Area IV feeding area consistent with these being separate populations. Greenpeace pho

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Mielcarek-Bocheńska, Paulina, and Wojciech Rzeźnik. "The Impact of Microclimate Parameters on Odour Emissions from Pig Production in Spring." Ecological Chemistry and Engineering S 26, no. 4 (2019): 697–707. http://dx.doi.org/10.1515/eces-2019-0050.

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Abstract The aim of this study was to examine the impact of inside temperature and relative humidity, ventilation rate and gas concentrations (NH3, N2O, CO2) on odour emissions from deep-litter piggery. The studied facility had temperature-controlled mechanical ventilation. The measurements were conducted from March to June 2014. During the research, selected microclimate parameters, as well as number and mass of animals were monitored and air samples were collected (two samples of air in each series of measurements). Temperature and relative humidity were measured using Testo 435-4 multifunct

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Naldrett, D. L., Andre Lachaine, and S. N. Naldrett. "Rare-earth elements, thermal history, and the colour of natural fluorites." Canadian Journal of Earth Sciences 24, no. 10 (1987): 2082–88. http://dx.doi.org/10.1139/e87-197.

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The contents of La and of all 13 naturally occurring rare-earth elements (REEs) in samples of natural fluorites were determined by neutron activation analysis. The samples were chosen to test the relation of REE content to colour. Total REE contents of the samples ranged from 3.46 to 97.2 ppm; the range of the least abundant REE, Lu, was 0.031–0.57 ppm and the range of the most abundant REE, Ce, was 0.94–33.3 ppm. No relation was found between the absolute amounts nor the enrichment or depletion of a particular REE and colour. The absorption spectra from 400 to 700 nm were determined by photo-

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