A5089535352- Advanced Frequency and Time Standards
- Scientific Measurement and Uncertainty Evaluation
- Intravenous Infusion Technology and Safety
- Flow Measurement and Analysis
- Cosmology and Gravitation Theories
- Microfluidic and Capillary Electrophoresis Applications
- Black Holes and Theoretical Physics
- Geophysics and Gravity Measurements
- Atmospheric chemistry and aerosols
- Geophysics and Sensor Technology
- Cold Atom Physics and Bose-Einstein Condensates
- Education, Psychology, and Social Research
- Wind and Air Flow Studies
- Advanced Sensor Technologies Research
- Gas Sensing Nanomaterials and Sensors
- Spectroscopy and Laser Applications
- Pulsars and Gravitational Waves Research
- Electrostatic Discharge in Electronics
- Vehicle emissions and performance
- Atomic and Subatomic Physics Research
- Relativity and Gravitational Theory
- Calibration and Measurement Techniques
- Water Systems and Optimization
- Noncommutative and Quantum Gravity Theories
- Hemodynamic Monitoring and Therapy
Český Metrologický Institut
2014-2024
Systèmes de Référence Temps-Espace
2015
Masaryk University
2004-2009
We derive relativistic corrections for one-way and two-way time frequency transfer over optical fibres neglecting no terms that exceed 1 ps in 10−18 fractional frequency, estimate their magnitude typical fibre links. also provide estimates of the uncertainties evaluation due to imperfect knowledge parameters like coordinates stations, Earth rotation, or thermal effects index length. The links between Teddington(UK) Paris(F) as well Braunschweig(D) Paris(F), are currently under construction,...
A new collaborative European project "International timescales with optical clocks" (ITOC) aims to tackle the key challenges that must be addressed prior a redefinition of SI second. coordinated programme comparisons will carried out between clocks developed in five different laboratories, enabling their performance levels validated at an unprecedented level accuracy. Supporting work evaluate relativistic effects influence comparisons, including gravitational redshift clock transition...
Abstract An increasing number of microfluidic systems operate at flow rates below 1 μl/min. Applications include (implanted) micropumps for drug delivery, liquid chromatography, and microreactors. For the applications where absolute accuracy is important, a proper calibration required. However, with standard facilities, rate calibrations ~1 μl/min are not feasible because too large uncertainty. In current research, traceable using certain temperature increase proposed. When fluid properties,...
Microflow measurement devices are used in several science and health applications, mainly drug delivery. In the last decade, new methods based on optical technology were developed, namely front tracking interferometric method, which knowledge of inner diameter syringe or capillary is critical. Only a few National Metrology Institutes (NMIs) can perform measurements below 1 mm, requires expensive technology. Therefore, IPQ, cooperation with CETIAT, CMI UNIDEMI, under EMPIR project 18HLT08...
An extensive review of past work on relativistic gravimetry, gradiometry and chronometric geodesy is given. Then, general theoretical tools are presented applied for the case a stationary parameterized post-Newtonian metric. The special clock surface Earth studied.
In this paper we show that velocity indication of vane anemometers with a propeller placed at the end mounting rod installed perpendicularly to air flow can vary by several percent (up 9% in our tests) if length exposed (insertion depth) is changed. Four different dimensions were tested for velocities (2–20) m/s and insertion depths (7.5–37.5) cm. Interlaboratory comparison was conducted showing how effect influences calibration results five wind tunnels test section diameters/widths from...
In this paper1 we derive formulas for relativistic corrections one-way and two-way time frequency transfer in optical fibres with accuracy of 1 ps relative 10-18 transfer. The can be used e.g. comparisons distant clocks connected by fibres.
Monitoring industrial pollutant emissions to air ensure compliance with EU directives and national legislation is the key enforcing emission limits thereby enabling their reduction control. Industry needs measure report for regulatory purposes including assessing stack against concentration limit values, reporting annual mass emissions, determining of GHGs from area sources. regulators require a robust metrology infrastructure underpin monitoring framework. The EMRP project IMPRESS [1] will...
The Euramet comparison No. 1046 is a supplementary of European national water flow laboratories. started in May 2008 and the measurements were finished June 2009. Eleven laboratories took part comparison—namely: Austria (BEV), Bosnia Herzegovina (IMBH), Czech Republic (CMI – pilot laboratory), France (CETIAT), Greece (EIM), Hungary (MKEH), Lithuania (VMT/LEI), Macedonia (BoM), Norway (Justervesenet), Slovakia (SMU) Switzerland (METAS). Two electromagnetic flow-meters used as transfer...
Almost every medical department in hospitals around the world uses infusion devices to administer fluids, nutrition, and medications patients treat many different diseases ailments. There have been several reports on adverse incidents caused by medication errors associated with equipment. Such can result from malfunction or improper use, even inaccuracy of equipment, cause harm patients' health. Depending intended use e.g. if it is used for anaesthesia adults treatment premature infants,...
We explicitly derive a vortex inspired solution for the metric perturbation within linearized Einstein general theory of relativity in arbitrary dimensions $D\ensuremath{\ge}4$. focus on $D=4$ where our is gravitational analog well-known electromagnetic (or electron) Bessel beams. Next we visualize perturbed spacetime via tidal tendexes and frame-drag vortexes. display analyze mostly two-dimensional sections vortexes different values an angular momentum wave solution. Corresponding geodesic...
Main text Supplementary interlaboratory comparison between European low air speed calibration facilities. Two thermal anemometers have been used as transfer standards and circulated five participants. The selection was based on stable behaviour sensitivity at very speeds. first anemometer calibrated by the participants nominal velocities from 0.05 m/s to 1.0 m/s. second 0.15 1 To reach main of this paper, click Final Report . Note that is which appears in Appendix B BIPM key database...
Several space missions that will use atomic clocks on board of an Earth-orbiting satellite are planned for the near future, such as Atomic Clock Ensemble in Space (ACES) or Optical ISS (I-SOC). The increasing accuracies developed and links connecting them with ground stations impose corresponding accuracy requirements theoretical models electromagnetic signal propagation through atmosphere Earth related time frequency transfer corrections. We develop a relativistic model one- two-way...
Hydrodynamic resistance is a critical parameter in microfluidics, affecting device functionality and performance. However, quantifying hydrodynamic microfluidics challenge due to many influencing factors the difficulties associated with precise measurements of low flow rates (< 10 L/min) pressure drops 5 kPa). This article presents simple experimental test method for assessing resistance, correlating theoretical numerical calculations. The results demonstrate good agreement between...
Monitoring industrial pollutant emissions to air ensure compliance with EU directives and national legislation is the key enforcing emission limits thereby enabling their reduction control. Industry needs measure report for regulatory purposes including assessing stack against concentration limit values, reporting annual mass emissions, determining of GHGs from area sources. regulators require a robust metrology infrastructure underpin monitoring framework. The EMRP project IMPRESS [1] will...
European legislation continues to drive down emission limit values, making the measurement of narrow stacks increasing importance. However, applicable standards (EN ISO 16911-1 and EN 15259) are poorly validated for stacks, effect flow disturbances on described methods largely unknown. In this article, errors investigated in with swirl, both experimentally through computational fluid dynamics (CFD) simulations. The results indicate that due misalignment typical measuring probes (pitot tubes)...
The Bousso entropy bound is investigated for static, spherically symmetric configurations of an ideal gas with a Bose–Einstein or Fermi–Dirac distribution function. Gas massive particles considered. This paper continuation the previous work concerning massless case. Special attention devoted to light sheets generated by spheres. Conditions under which can be violated are discussed and it shown that possible violating region cannot arbitrarily large contained inside sphere unit Planck radius...