Results 51 to 60 of about 1,664 (168)

External Modulation Optical Coherent Domain Reflectometry with Long Measurement Range

Sensors, 2021
Optical coherent domain reflectometry (OCDR) can achieve a high spatial resolution that is independent of the bandwidth of the receiver, but the measurement range is usually very limited.
Yinghong Xue, Yueping Niu, Shangqing Gong   +2 more
doaj   +1 more source

Piezoelectric Materials in Medical Ultrasound: A Comprehensive Review From Fundamentals to Translational Prospects

Information &Functional Materials, EarlyView.
Piezoelectric materials are reviewed as active platforms for medical ultrasound, bridging electromechanical fundamentals, transducer architectures, and biomedical applications. Material–device co‐design is emphasized as the key to high‐performance diagnosis, therapy, monitoring, wearable ultrasound, and emerging ultrasound‐responsive functions ...
Jianan Li, Qing Wan
wiley   +1 more source

Characterization of Rayleigh backscattering arising in various two-mode fibers

Optics Express, 2016
We experimentally characterize the mode dependent characteristics of Rayleigh backscattering (RB) arising in various two-mode fibers (TMFs). With the help of an all-fiber photonic lantern, we are able to measure the RB power at individual modes. Consequently, mode dependent power distribution of RB light caused by arbitrary forward propagation mode ...
Yu, Dawei, Fu, Songnian, Cao, Zizheng, Tang, Ming, Deng, Lei, Liu, Deming, Giles, I., Koonen, T., Okonkwo, C.   +8 more
openaire   +2 more sources

Transmission Raman Spectroscopy (TRS) for Accurate Authentication of API in Coated Hydroxychloroquine (HCQ) Tablets

Journal of Raman Spectroscopy, EarlyView.
We report the development and use of a transmission Raman spectroscopy (TRS) system for a more accurate but nonintrusive way of authentication of API in coated HCQ tablets which otherwise is not possible using the backscattered (BS) configuration of Raman spectroscopy. The coating interference is found to be almost zero in case of the TRS and a greater
Vijay Kumar, Khan Mohammad Khan, Hemant Krishna, Khageswar Sahu, Srinibas Satapathy, Shovan Kumar Majumder   +5 more
wiley   +1 more source

Monitoring shallow geothermal aquifers with active‐source distributed acoustic sensing: A prognostic feasibility study on the University of Leeds Geothermal Campus

Near Surface Geophysics, EarlyView.
Abstract The United Kingdom's shallow aquifers offer significant but underdeveloped geothermal energy resource. Seismic methods can help address this by improving the understanding of aquifer heterogeneity and potentially allowing long‐term monitoring of thermal plumes.
Adam D. Booth, Roger A. Clark, Andy Nowacki, Ravi Myanger, Joseph Kelly, Sjoerd de Ridder, Arka Dyuti Sarkar, Fleur Loveridge, Richard Collier, Emma Bramham, David Healy   +10 more
wiley   +1 more source

Increased backscattering from rough surface at the Rayleigh angle. [PDF]

The Journal of the Acoustical Society of America, 1991
The increased backscattering from liquid–solid interface at the Rayleigh angle is a well-known indication of leaky Rayleigh wave generation. A comprehensive experimental study [de Billy etal., J. Acoust. Soc. Am. 72, 1018 (1982)] showed much stronger backscattering signals than predicted later by theoretical work based on back reflection.
Claudio Pecorari, Peter B. Nagy, Laszlo Adler   +2 more
openaire   +1 more source

New insights into convection‐permitting model simulations from a ZDR$$ {\boldsymbol{Z}}_{\mathbf{DR}} $$ diagnostic for raindrops

Quarterly Journal of the Royal Meteorological Society, EarlyView.
A polarimetric radar forward operator to simulate differential reflectivity (ZDR$$ {Z}_{\mathrm{DR}} $$) from rain was developed to evaluate simulated storms in the Met Office Unified Model (MetUM) for two case days of the Wessex Convection Experiment (WesCon) field campaign. Vertical columns of ZDR$$ {Z}_{\mathrm{DR}} $$, indicative of strong updrafts,
Chun Hay Brian Lo, Thorwald H. M. Stein, Christopher D. Westbrook, Paul R. Field, Kalli Furtado, Robert W. Scovell, Jonathan M. Wilkinson, Timothy Darlington, Humphrey W. Lean, Ryan R. Neely III, Christopher J. Walden   +10 more
wiley   +1 more source

1310 nm Narrow Linewidth Laser Assisted by the Feedback of Double-FBGs

IEEE Photonics Journal, 2020
Narrow linewidth lasers with kHz or Hz have attracted tremendous attention due to their versatile applications in optical fiber sensing and optical fiber communication fields.
Paul Ikechukwu Iroegbu, Min Liu, Tianyi Lan, Dan Wang, Haonan Han, Yujia Li, Yulong Cao, Fuhui Li, Udochukwu Frank Iroegbu, Ligang Huang, Guolu Yin, Tao Zhu   +11 more
doaj   +1 more source

Characterization of coesite‐bearing impact melt glass from the Hapcheon crater, Korea: Trimodal phase architecture, shock metamorphism, and implications for 40Ar/39Ar geochronology

Meteoritics &Planetary Science, EarlyView.
Abstract We present the first micrometer‐scale, phase‐resolved compositional characterization of impact melt glass from the Hapcheon crater (~1.4 km apparent diameter), the first confirmed impact structure on the Korean Peninsula, integrating EPMA‐WDS (5 μm spot), confocal Raman spectroscopy (<1 μm spot), XRD, and 40Ar/39Ar step‐heating geochronology ...
Jin‐Young Lee, Jeongmin Kim, Sei‐Sun Hong   +2 more
wiley   +1 more source

High‐Resolution LiDAR Observations for Coupled Effects of Dry‐Air Entrainment and Haze‐Cloud Interactions on Cloud Vertical Structure

Geophysical Research Letters, Volume 53, Issue 15, 16 August 2026.
Abstract This study demonstrates the high‐resolution profiling of cloud microphysics in a laboratory chamber using Time‐Correlated Single Photon Counting (TCSPC) LiDAR. We present a novel retrieval method to derive vertical extinction (σ) $(\sigma )$ profiles, constrained by in situ measurements, to diagnose responses to dry‐air entrainment.
Jae Min Yeom, Suryadev Pratap Singh, Fan Yang, Hamed Fahandezh Sadi, Jesse C. Anderson, Yong Meng Sua, Manikandan Rajagopal, Steven K. Krueger, Will Cantrell, Raymond A. Shaw   +9 more
wiley   +1 more source