Publications by authors named "U E Vincent"
Double vibrational resonance is reported for a driven oscillator in a periodic structure of the Josephson junction type with high-frequency phase modulation. We identify two distinct phase modulation effects, namely, resonant induction and resonant amplification, leading to the appearance of a double resonance. We analyze these vibrational resonance phenomena theoretically and numerically, and we show that the origin of the induced resonance is traceable to a transition from periodicity to quasiperiodicity associated with an attractor-merging crisis.
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- The study investigates the phenomenon of vibrational resonance (VR) in bichromatically excited diatomic molecules using a specific molecular potential, emphasizing the role of saddle-node (SN) bifurcation in the occurrence of VR.
- Eight diatomic molecules, including H₂, N₂, and CO, were analyzed, revealing that each molecule has its own vibrational frequency distribution, with high-frequency amplitudes aligning with the SN bifurcation point.
- The findings, supported by numerical simulations, suggest that homonuclear halogens exhibit weak responses to bichromatic fields, potentially due to their lack of SN bifurcation.
Background: Wastewater surveillance (WWS) acts as a vigilant sentinel system for communities, analysing sewage to protect public health by detecting outbreaks and monitoring trends in pathogens and contaminants. To achieve a thorough comprehension of present and upcoming practices and to identify challenges and opportunities for standardisation and improvement in WWS methodologies, two EU surveys were conducted targeting over 750 WWS laboratories across Europe and other regions. The first survey explored a diverse range of activities currently undertaken or planned by laboratories.
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- - Combating antimicrobial resistance is a global priority that involves coordinated efforts from various health organizations and campaigns targeting different stakeholders like health professionals, the agricultural industry, and the general public.
- - The Regulation (EU) 2019/4 aims to limit the contamination of animal feed with specific antimicrobials, highlighting the need for effective detection methods for antibiotics in feed.
- - A new method was developed and validated for accurately detecting aminoglycoside antibiotics and spectinomycin in animal feed, showing high recovery rates and precision, which can help enhance regulatory control of antibiotic residues.
Determination of urea in pet feed: assessing the suitability of different analytical techniques using proficiency test data.
Food Addit Contam Part A Chem Anal Control Expo Risk Assess
March 2024
The determination of urea in pet feed at contaminant levels using the spectrophotometric method described in Commission Regulation (EC) No 152/2009 has been reported by several EU laboratories to lack the required selectivity. Whilst urea is not authorised as an additive in pet feed, the control of urea in pet feed is of economic importance, because the addition of urea may unlawfully increase the apparent protein content. To investigate the capabilities of different analytical techniques, a proficiency test was organised where the participants (EU official control laboratories, laboratories from the academia and private laboratories) were free to use their method of choice for analysing three dog feed test materials, two samples of which were spiked with urea.
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