Sentences with phrase «of uncertainty in measurement»

There actually exists an international guideline on expression of uncertainty — Guide to the expression of uncertainty in measurement.

The Joint Committee for Guides in Metrology (JCGM), is an organization that prepared the «Guide to the expression of uncertainty in measurement» (GUM) and the «International vocabulary of metrology — basic and general concepts and associated terms» (VIM).

ISO / IEC Guide 98 - 3:2008 is a reissue of the 1995 version of the Guide to the Expression of Uncertainty in Measurement (GUM), with minor corrections.

Study BIPM's GUM: Guide to the Expression of Uncertainty in Measurement; and NIST's Uncertainty of Measurement Results

3.3.2 In practice, there are many possible sources of uncertainty in a measurement, including: a) incomplete definition of the measurand; b) imperfect reaIization of the definition of the measurand; c) nonrepresentative sampling — the sample measured may not represent the defined measurand; d) inadequate knowledge of the effects of environmental conditions on the measurement or imperfect measurement of environmental conditions; e) personal bias in reading analogue instruments; f) finite instrument resolution or discrimination threshold; g) inexact values of measurement standards and reference materials; h) inexact values of constants and other parameters obtained from external

I can determine the standard uncertainty for all the measured variables from statistics It is falsifiable — i can move a body at a certain velocity for a certain time and measure the traveled distance If the traveled distance does not fit with calculated distance within the uncertainty calculated by using the international standard Guide to the expression of Uncertainty in Measurement the model might be wrong.

Regardless, recent changes have been too small to even notice and are often less than the government's estimates of uncertainty in the measurements.

Not exact matches

The degree of auditor judgment related to areas in the financial statements that involved the application of significant judgment or estimation by management, including estimates with significant measurement uncertainty;

Further complicating the picture is the possibility that the five youngish stars could be red giants after all, thanks to uncertainties in the measurements of their sizes, says astronomer Evan Kirby of Caltech.

Although the calculated mass for that pulsar, called J1614 - 2230, is lower than that of the black widow pulsar, the uncertainty in the measurement is smaller: + / - 0.04 solar masses vs 0.12 solar masses for the black widow pulsar.

Uncertainties in the measurement of mass make it hard to classify borderline objects this way.

«Which means that if you want to protect your biological specimen on a trip to Mars to a set conservative limit, you will probably be carrying six times too much shielding, just because the uncertainty is a factor of six — a 600 percent uncertainty in the measurement.»

The measured uncertainty in location capability was 16 meters, much higher than the target of 3 meters, but this metric can be improved through future noise suppression techniques, increased sensor bandwidth, and improved digital algorithms that can accurately extract distance measurements, Howe explained.

The new measurement is 1.380 651 56 (98) × 10 − 23 J K − 1, where the (98) shows the uncertainty in the last two digits, which amounts to an uncertainty of 0.7 parts per million — almost half the previous lowest uncertainty.

However, because each of these measurements must be calibrated to account for natural variation in the environment over time, individual dates have large amounts of error and uncertainty, making them difficult to aggregate or interpret in groups.

Like earlier efforts, the scheme, designed by Paul Townsend of the British Telephone Laboratories in Ipswich, U.K., relies on Heisenberg's uncertainty principle — the German physicist's famous insistence that any measurement of a system changes its state.

The uncertainty in the latest measurement is 150 parts per million, or 0.015 % — only slightly larger than that of the conventional method of determining G, which is to quantify the mutual pull of two macroscopic masses.

A separate experiment measuring the atoms in a silicon sphere has calculated Planck's constant down to an uncertainty of 20 parts per billion, while the best watt measurement has achieved an uncertainty of just 19 parts per billion.

Already the uncertainties in measurements using the best of these clocks are smaller than those in measurements using the very best cesium standards.

Measurements by Leo Hollberg's group at NIST, as well as by other groups elsewhere, suggest that the intrinsic limit of the optical comb is still a couple of orders of magnitude better than the uncertainty in current optical frequency mMeasurements by Leo Hollberg's group at NIST, as well as by other groups elsewhere, suggest that the intrinsic limit of the optical comb is still a couple of orders of magnitude better than the uncertainty in current optical frequency measurementsmeasurements.

The simplicity of optical combs has not only increased how often scientists around the world make these extremely precise frequency measurements but also greatly decreased the uncertainty in those measurements.

This allows high - precision measurements in a short time and considerably facilitates the future reduction of the total measurement uncertainty down to a few parts in 1018.

The team's new measurement is 13 times more precise than previous efforts, with an uncertainty of just 0.03 parts per billion, the researchers report online today in Nature.

She says uncertainty in these new measurements means the orbits of these dwarf galaxies may not be as nicely aligned as they seem.

In all, Endres and Wingreen's strategy halves the uncertainty in the concentration measurements and therefore allows cells to make measurements of a given certainty more quicklIn all, Endres and Wingreen's strategy halves the uncertainty in the concentration measurements and therefore allows cells to make measurements of a given certainty more quicklin the concentration measurements and therefore allows cells to make measurements of a given certainty more quickly.

«The tide gauge measurements are essential for determining the uncertainty in the GMSL (global mean sea level) acceleration estimate,» said co-author Gary Mitchum, USF College of Marine Science.

The interval doesn't reflect an uncertainty in measurement precision but rather a real variation of atomic weight from substance to substance.

As our measurements become more and more precise in this field, we are finding that most of our uncertainty comes from our lack of understanding of the stars that the planets orbit.

Rose, D., S.S. Gunthe, E. Mikhailov, G.P. Frank, U. Dusek, M.O. Andreae and U. Pöschl, Calibration and measurement uncertainties of a continuous - flow cloud condensation nuclei counter (DMTCCNC): CCN activation of ammonium sulfate and sodium chloride aerosol particles in theory and experiment, Atmospheric Chemistry and Physics, 8, 1153 - 1179, 2008.

These involved calculating weights for the velocity time series from the measurement uncertainties and adjusting them in order to minimize the noise level of the combined data.

I can certainly tell you that it would not be acceptable to report such a narrow combined uncertainty in a physics measurement (where uncertainties are much more under control) if the result of two measurements showed such discrepancies.

In metrology, measuring sticks must be traceably calibrated against standard tools of measurement, which must further be traced to primary standards based on physical constants, such as units of wavelength of light that have low measures of uncertainty.

And since we don't have good ocean heat content data, nor any satellite observations, or any measurements of stratospheric temperatures to help distinguish potential errors in the forcing from internal variability, it is inevitable that there will be more uncertainty in the attribution for that period than for more recently.

They also completely miss out any of the interesting uncertainty discussed here about the measurements and multi-decadal oscillations in the Ocean.

- > [# 3] Comparing two measurements with a possible uncertainty of + / - 6Sv each should result in a total uncertainty of + / -12 Sv (ossibly more considering less sophisticated equipment in 1957).

Of course, on a timescale of one decade the noise in the temperature signal from internal variability and measurement uncertainty is quite large, so this might be hard to determine, though tamino showed that five year means show a monotonic increase over recent decades, and one might not unreasonably expect this to cease for a decade in a grand solar minimum scenariOf course, on a timescale of one decade the noise in the temperature signal from internal variability and measurement uncertainty is quite large, so this might be hard to determine, though tamino showed that five year means show a monotonic increase over recent decades, and one might not unreasonably expect this to cease for a decade in a grand solar minimum scenariof one decade the noise in the temperature signal from internal variability and measurement uncertainty is quite large, so this might be hard to determine, though tamino showed that five year means show a monotonic increase over recent decades, and one might not unreasonably expect this to cease for a decade in a grand solar minimum scenario.

There are uncertainties in parts of the general circulation models used to forecast future climate, but thousands of scientists have made meticulous efforts to make sure that the processes are based on observations of basic physics, laboratory measurements, and sound theoretical calculations.

These measurements become sparser as we go further back in time, hence trend estimates become more uncertain; of course we fully accounted for this uncertainty in our analysis.

Sensor measurement uncertainty has never been fully considered in prior appraisals of global average surface air temperature.

we use global - scale atmospheric CO2 measurements, CO2 emission inventories and their full range of uncertainties to calculate changes in global CO2 sources and sinks during the past 50 years.

This work is partly needed because of people like you, who will never acknowledge the truth of measurement and data, or that uncertainty is a given in life and we still put one foot in front of another.

As scientists, it is in our nature to bristle at the thought of a zero uncertainty measurement, but as I have mentioned above though, the agreement in tree ring chronologies are really very good, and do lead to precisely dated events.

There are uncertainties in connecting the 14C production rate to recent instrumental measurements of solar magnetic modulation (see figure).

Those uncertainties are based on issues of interpolation, homogenization (for non-climatic changes in location / measurements) etc. and have been evaluated multiple ways — including totally independent homogenization schemes, non-overlapping data subsets etc..

For the slope to be significant, it has to be greater than the uncertainty (which in cases of observational measurement, is the variance around the determination of the mean).

Standard error involves both natural variability (including that not well understood because it operates on long time scales, and therefore has not been observed during the period of modern technology) as well as measurement error (or error / uncertainty in the proxies).

What ARM meant: To unravel the uncertainties in cloud feedbacks it was necessary to obtain simultaneous measurements of a broad range of parameters relative to clouds and their impact on the radiative energy balance.

Jane Burston, Head of the Centre for Carbon Measurement at the National Physical Laboratory, spoke to Climate Action about how the NPL is reducing uncertainty in climate data and helping to develop low carbon technologies.

The measurement environment is hardly static, yet we are looking for small variations in the climate in the midst of all this noise and uncertainty.

Rob — I'm not sure why you think the human origin of post-industrial CO2 increases is a subject of much uncertainty, since the conclusion resides in the convergence of multiple lines of evidence that include measurements of C14, C13, C12, atmospheric oxygen, volcanic activity, and records of industrial emissions.