A5047253632- Calibration and Measurement Techniques
- Scientific Measurement and Uncertainty Evaluation
- Advanced Sensor Technologies Research
- Geomagnetism and Paleomagnetism Studies
- Minerals Flotation and Separation Techniques
- Characterization and Applications of Magnetic Nanoparticles
- Thermal Regulation in Medicine
- Advanced Thermodynamic Systems and Engines
- Force Microscopy Techniques and Applications
- Advanced Measurement and Metrology Techniques
- thermodynamics and calorimetric analyses
- Metabolomics and Mass Spectrometry Studies
- Isotope Analysis in Ecology
- Field-Flow Fractionation Techniques
- Advanced Chemical Sensor Technologies
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced Surface Polishing Techniques
- Phase Equilibria and Thermodynamics
- Climate Change and Health Impacts
- Chemical Thermodynamics and Molecular Structure
- Atmospheric Ozone and Climate
- Infrared Thermography in Medicine
- Radiative Heat Transfer Studies
- Distributed and Parallel Computing Systems
- nanoparticles nucleation surface interactions
Instituto Nacional de Metrologia, Qualidade e Tecnologia
2007-2023
National Institute of Standards and Technology
2018
Universidade Federal do Rio de Janeiro
2014
Main text This is a report to the Consultative Committee for Thermometry (CCT) on key comparison 9 of Standard Platinum Resistance Thermometer (SPRT) calibration International Temperature Scale 1990 (ITS-90) [1] from 83.8058 K (the Ar triple point) 692.677 Zn freezing point). The followed collapsed star protocol, with each fourteen participating laboratories shipping two standard platinum resistance thermometers (SPRTs) as transfer standards pilot laboratory (National Institute Standards and...
Main text This is the final report of CCT-K7.2021 key comparison water-triple-point (TPW) cells. The primary objective was a participant national realizations TPW temperature. Each laboratory selected one its cells for use as transfer cell, directly compared it against reference and delivered to pilot (NRC). then all two NRC and, finally, each retrieved cell re-compared reference. initial measurements at laboratories were started in April 2021. participants' completed September 2022....
The Minamata Convention on Mercury has created a near-term need to develop alternative fixed points replace the mercury triple point (Hg TP) for calibration of standard platinum resistance thermometers (SPRTs) International Temperature Scale 1990 (ITS-90). sulfur hexafluoride (SF6) TP is good candidate provide adequate "drop-in compatible" replacements lowest costs. We report our first results SF6 realizations performed at National Institute Standards and Technology (NIST) using new series...
Main text This report shows the results of a bilateral comparison temperature standards between Instituto Nacional de Metrologia, Qualidade e Tecnologia (Inmetro, Brazil), and Trinidad Tobago Bureau Standards (TTBS, Tobago), carried out January July 2020. The measurands this were W(t 90 ) ratios two Standard Platinum Resistance Thermometers (SPRTs), used as transfer standards, measured at zinc freezing point (Zn FP, 419.527 °C), tin (Sn 231.928 gallium melting (Ga MP, 29.7646 triple water...
Abstract Objective . Image reconstruction is a fundamental step in magnetic particle imaging (MPI). One of the main challenges fact that reconstructions are computationally intensive and time-consuming, so choosing an algorithm presents compromise between accuracy execution time, which depends on application. This work proposes method provides both fast accurate image reconstructions. Approach algorithms were implemented to be executed parallel graphics processing units (GPUs) using CUDA...
Magnetic particle imaging (MPI) is an emerging technique with many applications and a very active field of research. This app provides users the opportunity to develop some intuition about inner workings MPI as it being researched through NIST's Thermal MagIC project in interactive fun way. Users can vary different experimental post-processing parameters see how image quality reconstruction changes for measurement conditions.
In recent years, there has been increasing interest in the understanding and application of nanoparticle assemblies driven by external fields. Although these systems can exhibit marked transitions behavior compared to non-interacting counterparts, it often proven challenging connect their dynamics with underlying physical mechanisms or even verifiably establish structure under realistic experimental conditions. We have studied colloidal iron oxide nanoparticles that assemble into ordered,...
Type K thermocouples are one of the most commonly used temperature sensors in industry. The skills, personnel, and facilities necessary for calibrating type also applicable to calibration other base metal thermocouples, and, a lesser extent, platinum?rhodium alloy thermocouples. Under auspices Inter-american Metrology System (SIM), National Institute Standards Technology (NIST) initiated regional comparison from 100 ?C 1100 ?C, with 11 participating countries. use material above...
The Atomic Force Microscopy (AFM) is a scanning probe technique widely used to produce nanometric scaled images of virtually any kind non-conductive or biological surface. Depending on the dimensions an expected AFM image structure subjected be modified by great amounts external noise (low Signal/Noise ratios) - electrical mechanical and/or blurring due geometry measuring probe. In order minimize such effects, restoration techniques can employed. one based minimization Tikhonov's...
Some relevant components of uncertainty in interferometric measurements are associated with temperature material standards. This paper proposes a traceability transfer chain through high accuracy contact measurement system towards other systems. Those traced to the best national metrological references appropriate configurations for gauge-block length calibrations, allowing that way investigations effects and linked those blocks as further reductions these uncertainties. As an application...
Abstract Despite being classified today as a secondary reference point of temperature, the ice (0.0 °C) is still very important in many thermometry applications due to its simplicity, effectiveness, reproducibility and low cost. Uncertainties some hundreds microkelvin can be achieved, but it depends on level care experimental procedure practiced by laboratory. The Thermometry Laboratory Inmetro (Later) has adopted for long time conservative value available literature uncertainty point. In...
Main text A collapsed star type S thermocouple intercomparison was performed over the International Temperature Scale of 1990 (ITS-90) temperature range from 0 °C to 1100 °C. This an Inter-American Metrology System (SIM) regional piloted by National Institute Standards and Technology (NIST). Eleven laboratories (including NIST) participated in intercomparison. Twenty-one thermocouples were constructed calibrated at NIST, which ten served as transfer standards. The identified Cut 1 through...