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Investigation and modeling of land use effects on water quality in two NYC water supply streams.
J Environ Manage
January 2025
71 Smith Ave., Bureau of Water Supply, New York City Department of Environmental Protection, Kingston, NY, 12401, USA.
The paired watershed monitoring approach is widely used to investigate hydrologic processes and water quality, providing streamflow and water quality records for long-term trend analysis, as well as data for developing and testing hydrologic models. In this study we use 20 years of streamflow and water quality data, along with a watershed model, to examine sources of stream nutrients and their changes over time in two small streams within the New York City water supply system. We compare sources and trends in stream nitrate and dissolved phosphorus in the urbanized Amawalk watershed with those of the predominantly forested Boyd Corners watershed in the Croton system of reservoirs.
View Article and Find Full Text PDFPrediction and observation of topological modes in fractal nonlinear optics.
Light Sci Appl
January 2025
Department of Physical Electronics, School of Electrical Engineering, Faculty of Engineering, and Center for Light-Matter Interaction, Tel Aviv University, Tel Aviv, Israel.
This item from the News and Views (N&V) category aims to provide a summary of theoretical and experimental results recently published in ref. , which demonstrates the creation of corner modes in nonlinear optical waveguides of the higher-order topological insulator (HOTI) type. Actually, these are second-order HOTIs, in which the transverse dimension of the topologically protected edge modes is smaller than the bulk dimension (it is 2, in the case of optical waveguide) by 2, implying zero dimension of the protected modes, which are actually realized as corner or defect ones.
View Article and Find Full Text PDFWith an estimated incidence of 0.02% to 0.2%, multiligamentous knee injuries are rare, often devastating injuries that can occur with concomitant vascular or neurologic involvement.
View Article and Find Full Text PDFLow-Dose Ionizing Radiation Exposure and Its Impact on Skin Aging Among Healthcare Workers.
Clin Exp Dermatol
December 2024
Dinar State Hospital, Department of Dermatology, Afyonkarahisar, Turkey.
Background: Ionizing radiation (IR) is a occupational risk for healthcare professionals, which can result in a range of health issues.
Objectives: This study aims to assess the relationship between low-dose IR exposure and the development of early aging-related skin wrinkles in healthcare workers.
Methods: In the current cross-sectional study, 70 health workers exposed to low-dose ionizing radiation for at least five years were compared with 70 non-exposed health workers.
Topological edge and corner states in coupled wave lattices in nonlinear polariton condensates.
Nanophotonics
February 2024
Department of Physics and Center for Optoelectronics and Photonics Paderborn (CeOPP), Paderborn University, 33098 Paderborn, Germany.
Article Synopsis
- Researchers studied topological edge states in double-wave chains using a modified Aubry-André-Harper model.
- They discovered that different edge states can form in a driven-dissipative exciton polariton system due to optical nonlinearity, leading to multistability.
- By stacking DW chains vertically, they created 2D multi-wave lattices that give rise to higher-order topological insulator corner states, which also demonstrate multistability in the nonlinear regime.
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