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A high-sensitivity hot-wire anemometer is proposed for use with a cobalt-doped fiber (CDF) based long-period grating (LPG) heated optically by a 1480 nm laser. The CDF-LPG absorbs laser power and generates heat inherently, thereby eliminating the need for both metal coating and mode coupling devices that are usually required in optical fiber grating anemometers. The dip wavelength of the CDF-LPG shifts with airflow velocity due to the cooling effect of the airflow.
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ACS Appl Mater Interfaces
January 2025
School of Artificial Intelligence Science and Technology, University of Shanghai for Science and Technology, Shanghai 200093, China.
Passive radiative cooling has recently gained significant attention as a highly promising technology that offers a zero-energy and electricity-free solution to tackle the pressing issue of global warming. Nevertheless, research efforts have predominantly focused on enhancing daytime and hot-day radiative cooling efficacy, often neglecting the potential downsides associated with excessive cooling and the consequent increased heating expenses during cold nights and winter days. Herein, we demonstrate a micro-nanostructured engineered composite film that synergistically integrates room-temperature adaptive silica-shell/oil-core phase change microcapsules (S-PCMs) with commercially available cellulose fibers.
View Article and Find Full Text PDFHeat Stroke in the Era of Global Warming: A Call for Urgent Action.
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Dow University of Health Sciences, Karachi, Pakistan.
Heat stroke (HS) represents a life‑endangering condition that is due to an imbalance between heat generation and dissipation, owing to exposure to hot environments or strenuous exercise. HS is a medical condition that is gaining increased prevalence throughout the world due to a steady rise in temperature, and massive mortalities have been recorded among vulnerable populations. In 2024, extreme heat waves led to increased cases of HS and related fatalities globally, particularly in Karachi, Pakistan.
View Article and Find Full Text PDFComprehensive Study on the Thermoelectric Properties and Influencing Factors of Wearable Spiral Bracelets Enhanced by Radiation Cooling.
ACS Omega
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Key Laboratory of High Performance Ship Technology, Wuhan University of Technology, Ministry of Education, Wuhan 430063, China.
Wearable thermoelectric generator (TEG) can collect human body heat and convert it into electrical energy, achieving self-powering of the device and thus becoming a hot research topic at present. By utilization of three-dimensional spiral thin-film thermoelectric structures and passive radiation cooling methods, the heat transfer area can be increased and power generation can be enhanced. In order to study the effect of outdoor radiation cooling on the thermoelectric performance of spiral heating, as well as the TEG performance output under different external environments and circuit loads, this paper proposes a new three-dimensional coupled numerical model of the spiral thermoelectric wristband system with multiple physical fields.
View Article and Find Full Text PDFDynamic Brush Surface Inducing Mobile Crystallization for Sustainable Spray Cooling Using Saline.
Nano Lett
January 2025
School of Nanoscience and Materials Engineering, Henan University, Zhengzhou, Henan 450046, China.
Spray cooling, which dissipates heat through droplet evaporation, is an efficient cooling method. Using seawater instead of freshwater in spraying is appealing given the intensifying global water crisis. However, seawater-based cooling suffers from salt accumulation on hot surfaces.
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