We have constructed an optical clock with a fractional frequency inaccuracy of 8.6x10{-18}, based on quantum logic spectroscopy of an Al+ ion. A simultaneously trapped Mg+ ion serves to sympathetically laser cool the Al+ ion and detect its quantum state. The frequency of the {1}S{0}<-->{3}P{0} clock transition is compared to that of a previously constructed Al+ optical clock with a statistical measurement uncertainty of 7.0x10{-18}. The two clocks exhibit a relative stability of 2.8x10{-15}tau{-1/2}, and a fractional frequency difference of -1.8x10{-17}, consistent with the accuracy limit of the older clock.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1103/PhysRevLett.104.070802 | DOI Listing |
Nanoscale Adv
January 2025
Energy Masteries Laboratory, Physics Department, School of Sciences and Engineering, The American University in Cairo New Cairo 11835 Egypt
Laser surface alloying of Fe, Si, and C on aluminium is demonstrated using a Q-switched Nd:YAG laser as the source of energy. The fundamental wavelength of the laser beam was 1064 nm with an output energy of 100 mJ and a pulse duration of 10 ns. The exposure was conducted in repetitive mode with a frequency rate of 1 Hz.
View Article and Find Full Text PDFNanoscale Adv
January 2025
Department of Production Engineering, Faculty of Mechanical Engineering, University of Aleppo Aleppo Syria
Adverse reactions caused by waterborne contaminants constitute a major hazard to the environment. Controlling the pollutants released into aquatic systems through water degradation has been one of the major concerns of recent research. Bismuth-based perovskites have exhibited outstanding properties in the field of photocatalysis.
View Article and Find Full Text PDFJ Cataract Refract Surg
January 2025
Aros Private Hospital, Aarhus, Denmark (Olsen).
Purpose: We analyzed intraocular lens (IOL) power calculation in a series of patients with a zero diopter power implant. The idea was to bypass the Estimated Lens Plane (ELP), an important variable in normal IOL calculation.
Setting: Large multi-center group practice.
Sci Rep
January 2025
Department of Communications and Electronics, School of Electrical and Computer Engineering, Shiraz University, Shiraz, Iran.
This paper presents an all-optical 4 × 2 encoder based on graphene-plasmonic waveguides for operation in the wavelength range of 8-12 μm. The basic plasmonic waveguide consists of a silicon (Si) strip and a graphene sheet supported by two dielectric ridges. Surface plasmon polaritons (SPPs) are stimulated in the spatial gap between the graphene sheet and the Si strip.
View Article and Find Full Text PDFChem Biol Interact
January 2025
Safety Assessment, Syngene International Limited, Biocon Park, Bommasandra IV Phase, Jigani Link Road, Bangalore, 560099, Karnataka, India.
Acovenoside A, a cardenolide glycoside from Acokanthera oppositifolia, demonstrates significant therapeutic potential in cardioprotection and oncology, particularly against non-small cell lung cancer (NSCLC). However, its toxicological profile requires thorough evaluation for safe pharmaceutical application. For this purpose a comprehensive in silico methods were applied, including ACD/Labs Percepta, STopTox, admetSAR 3.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!