A5000462682- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Scientific Measurement and Uncertainty Evaluation
- Avian ecology and behavior
- Aquaculture Nutrition and Growth
- Physiological and biochemical adaptations
- Hemodynamic Monitoring and Therapy
- Cardiovascular Syncope and Autonomic Disorders
- Meat and Animal Product Quality
- Quantum optics and atomic interactions
- Smart Agriculture and AI
- Reproductive biology and impacts on aquatic species
- Viral Infections and Vectors
- Time Series Analysis and Forecasting
- Geotechnical and Geomechanical Engineering
- Advanced Fiber Laser Technologies
- Muscle Physiology and Disorders
- Leptospirosis research and findings
- Marine Bivalve and Aquaculture Studies
- Geology and Paleoclimatology Research
- Adipose Tissue and Metabolism
- Dark Matter and Cosmic Phenomena
- Aquaculture disease management and microbiota
- Bird parasitology and diseases
National Physical Laboratory
2022-2024
Binus University
2022
University of Strathclyde
2017
The University of Melbourne
1978
Abstract We present a new framework to study the time variation of fundamental constants in model-independent way. Model independence implies more free parameters than assumed previous studies. Using data from atomic clocks based on 87 Sr, 171 Yb + and 133 Cs, we set bounds controlling fine-structure constant, α , electron-to-proton mass ratio, µ . consider variations timescales ranging minute almost day. In addition, use our results derive some tightest limits date parameter space models...
Abstract The detection of variations fundamental constants the Standard Model would provide us with compelling evidence new physics, and could lift veil on nature dark matter energy. In this work, we discuss how a network atomic molecular clocks can be used to look for such unprecedented sensitivity over wide range time scales. This is precisely goal recently launched QSNET project: A measuring stability constants. will include state-of-the-art clocks, but also develop next-generation highly...
Optical atomic clocks demonstrate a better stability and lower systematic uncertainty than the highest performance microwave clocks. However, best performing optical have large footprint in laboratory environment require specialist skills to maintain continuous operation. Growing evolving needs across several sectors are increasing demand for compact robust portable devices at this capability level. In paper we discuss design of physics package laser-cooled 88 Sr + clock that would, with...
The influence of freshwater environment on muscle growth in seawater was investigated an inbred population farmed Atlantic salmon (Salmo salar L.). offspring from a minimum 64 families per group were incubated at either ambient temperature (ambient treatment) or heated water (heated treatment). Growth using mixed-effect statistical model with repeated measures, which included terms for treatment effect and random fish effects individual rate (alpha) the instantaneous unit change (gamma)....
Abstract A full evaluation of the uncertainty budget for ytterbium ion optical clock at National Physical Laboratory (NPL) was performed on electric octupole (E3) <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:msup> <mml:mrow/> <mml:mn>2</mml:mn> </mml:msup> <mml:msub> <mml:mtext>S</mml:mtext> <mml:mn>1</mml:mn> <mml:mo>/</mml:mo> </mml:mrow> </mml:msub> <mml:mo>→</mml:mo> <mml:mtext>F</mml:mtext> <mml:mn>7</mml:mn> </mml:math> transition. The...
SUMMARYSmith, A. J., and B. I. Robertson. 1978. Social organization of Bell Miners. Emu 78: 169–178.A preliminary account is given a continuing study an isolated sedentary population colour-banded Miners Manorina melanophrys at Bundoora, Victoria, started in March 1974. The consisted loose aggregation discrete mobile groups based on the family unit. Groups held separate territories but combined with other defence whole area. All avian intruders between canopy top understorey are attacked....
Abstract The recently concluded collaborative European project “Robust optical clocks for international timescales” (ROCIT) tackled some of the key challenges on roadmap towards a redefinition SI second. This paper gives an overview progress made improving robustness and automation verifying their uncertainty budgets through coordinated comparison campaigns. It also presents work incorporation into time scales, covering both use to steer local physical scales evaluations hydrogen masers...
We used measurements of brood patch and moult status to estimate the breeding phenology New Zealand Storm-Petrel, using birds caught at sea within Hauraki Gulf Marine Park near Auckland, Zealand. Birds October–January had completely downy patches, whereas February–April bare patches with an observed male bias in February sex-ratio, consistent a female pre-laying exodus typical petrels existence unknown colony region. No captured exhibited primary moult, which is known occur storm-petrels...
Optical atomic clocks demonstrate a better stability and lower systematic uncertainty than the highest performance microwave clocks. However, best performing optical have large footprint in laboratory environment require specialist skills to maintain continuous operation. Growing evolving needs across several sectors are increasing demand for compact robust portable devices at this capability level. In paper we discuss design of physics package laser-cooled 88Sr+ clock that would, with...
A full evaluation of the uncertainty budget for ytterbium ion optical clock at National Physical Laboratory (NPL) was performed on electric octupole (E3) $^2\mathrm{S}_{1/2}\,\rightarrow\, ^2\mathrm{F}_{7/2}$ transition. The total systematic frequency shift measured with a fractional standard $2.2\times 10^{-18}$. Furthermore, absolute E3 transition $^{171}$Yb$^+$ between 2019 and 2023 via link to International Atomic Time (TAI) against local caesium fountain NPL-CsF2. frequencies were...
Abstract In this paper, we present real-time optically steered time scales generated simultaneously at the Observatoire de Paris (OP) and National Physical Laboratory (NPL). Throughout one month, experimental UTCx( k ) were concurrently in two laboratories alongside local operational UTC( scales. The based on hydrogen masers whose frequencies calibrated by optical frequency standards using combs, with algorithms being developed for outlier filtering steering estimations laboratories....
Abstract Ensuring robust operation of optical clock systems requires increasingly complex automation experimental protocols. This includes real-time monitoring system output for data validation and high accuracy assessment systematic frequency shifts. We report here on recent advances in the control 171 Yb + ion at NPL (National Physical Laboratory, UK) describe how this has led to improvements shift metrology reduced overall uncertainty budget clock. Additionally we present an rf trap...
An atom interferometer using a Bose--Einstein condensate of $^{87}\mathrm{Rb}$ atoms is utilized for the measurement magnetic-field gradients. Composite optical pulses are used to construct spatially symmetric Mach--Zehnder geometry. By biased we demonstrate ability measure small residual forces in our system and discriminate between magnetic inertial effects. These ambient gradient $15\ifmmode\pm\else\textpm\fi{}2$ mG/cm an acceleration $0.08\ifmmode\pm\else\textpm\fi{}0.02$...
The purpose of this study is to propose an agrotechnology system using internet things.It Called Mobile IoT Farming Systems.Its can help the productivity crop planting.The research methodology consists several stages such as: requirement analysis, systems design, and development.First stage was conducted by collecting requirements data through interviews.Second implementing UML design system.Third develop mobile technology.The results are features systems, implementation.It be used for urban...
Optical clocks can now achieve a higher stability and lower systematic uncertainty than the highest performance microwave atomic clocks. For Trapped Ion Space Clock (TISOC) project funded by European Agency (ESA) we are developing an optical clock based on trapped laser-cooled strontium ion for future deployment in space. In laboratory setting, <sup>88</sup>Sr<sup>+</sup> system has been shown to provide excellent crucially reduced size, mass, laser power complexity compared alternatives...
We present a new framework to study the time variation of fundamental constants in model-independent way. Model independence implies more free parameters than assumed previous studies. Using data from atomic clocks based on $^{87}$Sr, $^{171}$Yb$^+$ and $^{133}$Cs, we set bounds controlling fine-structure constant, $α$, electron-to-proton mass ratio, $μ$. consider variations timescales ranging minute almost day. In addition, use our results derive some tightest limits date parameter space...
Excel data corresponding to the figures in paper titled 'Detection of Residual Inertial Forces with A Matterwave Magnetic-Gradiometer'
Technology is developing rapidly coupled with globalization and the industrial era 4.0 makes everything turn digital, one of which in field urban agriculture (urban farming). In this study, we collect data using interview observation. We used UML approach for analyze design system. Then, proposed system architecture. After that, create user interface develop prototype also. that can be integrate between mobile application web application. The results study are architecture, It to make easier...