Results 1 to 10 of about 21,013,688 (300)

Comprehensive Comparison of TF-IDF and Word2Vec in Product Sentiment Classification Using Machine Learning Models

Journal of Applied Informatics and Computing
Sentiment analysis supports data-driven decisions by turning product reviews into reliable polarity labels. We compare four text representations, TF-IDF, TF-IDF reduced via SVD, Word2Vec (trained from scratch), and a hybrid TF-IDF(SVD-300). Word2Vec, for
Asra Gretya Sinaga, Robet Robet, Octara Pribadi   +2 more
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Quantitative Measurements of Codeine and Fentanyl on a Surface-Enhanced Raman-Active Pad

Molecules, 2019
The USA is in the midst of an opioid crisis that included over 60,000 overdose fatalities in 2017, mostly unintentional. This is due to excessive use of prescription opioids and the use of very strong synthetic opioids, such as fentanyl, mixed with ...
Chetan Shende, Amelia Farquharson, Carl Brouillette, Wayne Smith, Stuart Farquharson   +4 more
doaj   +1 more source

Pump-Enhanced Idler-Resonant 1626 nm Optical Parametric Oscillator

Photonics
The 1626 nm laser is an essential component for conducting superlattice research on the strontium atomic clock platform. The superlattice constructed with the 1626 nm and 813 nm lasers will facilitate cutting-edge quantum information research focused on ...
Yanyan Liu, Chaozhe Hu, Guodong Zhao, Chihua Zhou, Jian Xia, Jie Ren, Wei Tan, Hong Chang   +7 more
doaj   +1 more source

Determining the Magic Wavelength Without Modulation of the Trap Depth

Optics
In this paper, the magic wavelength of the 87Sr optical lattice clock is determined by a method that bypasses the need for lattice trap depth modulation.
Jingjing Xia, Feng Guo, Yanhua Zhou, Xiaotong Lu, Hong Chang   +4 more
doaj   +1 more source

Spatially Resolved Precision Measurement of Magnetic Field Using Ultracold Cesium Atoms as Sensors

Atoms
Sub-Doppler laser-cooled cesium-133 atoms are utilized as quantum sensors to achieve precise mapping of magnetic fields across a region in ultra-high vacuum (UHV), with a spatial resolution of 1 cm and a sensitivity of approximately 550 pT/√Hz, enabling ...
Anjali Bisht, Manoj Das, Poonam Arora
doaj   +1 more source

Noise Differentiation and Atom Number Measurement in Optical Lattice Clocks by Analyzing Clock Stabilities with Various Parameters

Applied Sciences
We propose a method that enables the precise determination of the number of atoms in a Dick-noise-free optical lattice clock, by effectively addressing quantum projection noise.
Guodong Zhao, Feng Guo, Xiaotong Lu, Hong Chang   +3 more
doaj   +1 more source

Publisher Correction: Chip-scale atomic diffractive optical elements

Nature Communications, 2019
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Liron Stern, Douglas G. Bopp, Susan A. Schima, Vincent N. Maurice, John E. Kitching   +4 more
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Drug Stability Analysis by Raman Spectroscopy

Pharmaceutics, 2014
Pharmaceutical drugs are available to astronauts to help them overcome the deleterious effects of weightlessness, sickness and injuries. Unfortunately, recent studies have shown that some of the drugs currently used may degrade more rapidly in space ...
Chetan Shende, Wayne Smith, Carl Brouillette, Stuart Farquharson   +3 more
doaj   +1 more source

Experimental analysis of time difference of arrival estimates based on inexactly reconstructed signals

Scientific Reports
Abstract: Time Difference of Arrival (TDOA) estimation is a pivotal technique with extensive applications across various domains, including passive detection and indoor positioning.
Shanhe Wang, Changjiang Huang, Yu Xiang, Yuanyuan Gao, Xian Zhao, Yu Hua   +5 more
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Styrking av helseberedskap og krisehåndtering – «mismatch» mellom samarbeidet i EU og EØS?

Internasjonal Politikk
I EU er helsepolitikk, helseberedskap og krisehåndtering primært et nasjonalt anliggende. Over tid har likevel medlemslandene styrket samarbeidet på disse områdene.
Frode Veggeland, Martin Stangborli Time
doaj   +1 more source