An optical fiber sensor based on a hole-assisted dual-core fiber (HADCF) has been proposed and experimentally demonstrated for dual-parameter measurements. The dual-mode interferometer created uses the LP mode and LP mode in the suspended core of a specialist optical fiber, combined with a directional coupler formed by using the suspended core and the center core in a 16 mm long HADCF. Using this, the simultaneous measurement of salinity (due to the presence of NaCl) and temperature has been achieved through monitoring the interference dip and resonance dip. The sensitivities of the measurement of salinity and temperature are 190.7 pm/‰ and -188.2 pm/°C, respectively. The sensor developed has the advantages of simplicity of fabrication, a high level of integration and the potential for measurement of dual parameters, supporting its potential applications in marine environment measurements.
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http://dx.doi.org/10.1364/OE.500576 | DOI Listing |
Nano Lett
January 2025
CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology, Beijing 100190, People's Republic of China.
Exciton emitters in two-dimensional monolayer transition-metal dichalcogenides (TMDs) provide a boulevard for the emerging optoelectronic field, ranging from miniaturized light-emitting diodes to quantum emitters and optical communications. However, the low quantum efficiency from limited light-matter interactions and harmful substrate effects seriously hinders their applications. In this work, we achieve a ∼438-fold exciton photoluminescence enhancement by constructing a Fabry-Pérot cavity consisting of monolayer WS and a micron-scale hole on the SiO/Si substrate.
View Article and Find Full Text PDFJ Coll Physicians Surg Pak
January 2025
Department of Anaesthesiology, Chongqing University Central Hospital, Chongqing Emergency Medical Centre, Chongqing, China.
The study assessed the effectiveness and safety of nerve block combined with low-dose general anaesthesia in elderly hip arthroplasty patients, conducted by a meta-analysis of RCTs. Six trials involving 403 patients were identified from databases such as Cochrane, MEDLINE, and PubMed. The results demonstrated a statistically significant difference in pain scores at postoperative 12hours (95% CI, -2.
View Article and Find Full Text PDFJ Biophotonics
January 2025
Laser Biomedical Applications Division, Raja Ramanna Centre for Advanced Technology, Indore, India.
Availability of a suitable tool for carrying out non-invasive measurement of Raman signatures in situ, from biological tissues having low Raman cross section is a clinically unmet need faced with manifold challenges. A Raman probe can prove to be an invaluable component of clinical Raman diagnostic systems. We present development of a Raman probe capable of measuring artefact free Raman spectra of biological tissues in situ.
View Article and Find Full Text PDFBMC Public Health
January 2025
School of Public Health, North Sichuan Medical College, No. 234 Fujiang Road, Nanchong, 637000, Sichuan, China.
Background: Childhood obesity is associated with obesity in adulthood, but the consistency between the geographic distributions of obesity among children and adults in China is not fully understood. We aimed to examine the consistency of the geographic distributions of overweight and obesity between adults and children in China.
Methods: This was a cross-sectional study including 11,940 adults.
Sci Data
January 2025
ESA-ESRIN, Frascati, Rome, Italy.
Sea ice thickness is an essential variable to understand and forecast the dynamic ice cover and can be estimated by satellite altimetry. Nevertheless, it is affected by uncertainties especially from snow depth, a key parameter to derive it from ice freeboard. We developed a snow depth product based on the differences between CryoSat-2 SAR Ku and IceSat-2 laser altimeters which have different snow penetration capabilities.
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