Sentences with phrase «temperature coefficient»

This is because each cell has an internal positive temperature coefficient (PTC) current limiting device.

Last time it was building a reactor with a positive temperature coefficient, using combustible moderator — now that won't happen again, count on it.

Check solar panel ratings and reviews carefully for the temperature coefficient, particularly if you live in hotter parts of the country.

This course evaluates self - regulating polymer technology and the performance benefits of using PTC (positive temperature coefficient) heaters for energy efficient floor warming, primary heating, snow melting, and roof de-icing.

At higher power levels, the moderator temperature coefficient was only mildly negative, and, thus, was not able to turn the significant power rise resulting from the temperature spike at the time of incident initiation.

The Chernobyl design had a positive moderator temperature coefficient at low powers.

Normally, it is a very controlled process defendant on specific feedbacks, such as a negative moderator temperature coefficient.

In the diesel models and the four - cylinder models with direct petrol injection, a heat exchanger with six integral PTC heating elements (PTC = Positive Temperature Coefficient) is also activated when the outside temperature falls below a certain level in order to supplement the heater heat exchanger with an electrical output of around 1200 watts.

On extremely cold days, a Positive Temperature Coefficient heater warms air instantly by passing it over an electrically heated ceramic element.

But here's the thing — the car has a small Positive Temperature Coefficient (PTC) heater for some cabin heat in mild conditions.

In electric mode the car uses a PTC (Positive Temperature Coefficient) air heater.

Unlike reactors of the Chernobyl type, the VHTR has a negative temperature coefficient, meaning that as the core temperature rises, nuclear reactions inside naturally begin to slow down.

However, due to recent technology improvements, First Solar's CdTe thin film solar is roughly as efficient as standard multicrystalline silicon, and with the low - light and better temperature coefficient advantages, will likely produce more power under most conditions.

Panels with less sensitive temperature coefficients will perform better over the long term.

Not exact matches

According to Glenn Daehn, a professor of materials science at the university, the composite is stronger and stiffer than aluminium, especially at temperatures above 600 oC, has a low coefficient of thermal expansion, and is much easier to machine than any ceramic.

This fluctuation, also known as Kondo resonance, increases the Seebeck coefficient with keeping metal - like high electrical conductivity at low temperature, and therefore the power factor.

Through an oil - temperature sensor, the SH - AWD ® Control Unit monitors the rear differential's clutch - plate coefficient of friction (that changes with temperature) in each clutch pack and then adjusts the voltage to each electromagnetic coil to compensate.

With nearly all variables I've ever used, including ice extent and temperatures, the lagged dependent variables have large negative coefficients, since changes one period tend to lead to «movement to the mean» in the next period.

Such effects are able to make to vary, in the course of many centuries, the average degree of heat; because the analytic expressions contain coefficients relating to the state of the surface and which greatly influence the temperature.

In that case it does not matter how the water is heated but simply the temperature of the layer of surface water down to a few multiples of the inverse of the IR absorption coefficient which is I think varies from around a few cm to less than 1 mm with increasing wavelength.

Together, a basic Pearson correlation coefficient yields statistically significant results, indicating that CO2 emissions are having a real statistical association with the increase in global temperatures.

Perhaps I should spell it out more emphatically, this time regressing the 11 - year moving averages of rainfall on temperature, which show that more heat implies more rain, with R2 at.24, the X coefficient at 2.85, standard error 0.547, and t at 5.2.

There are important implications in this observation not least the possibility of biased regression coefficients in attempts to reconstruct past low - frequency temperature change based on long density series calibrated against recent temperatures.

At Mauna Loa, the correlation coefficient was 0.62, with negligible probability that the coefficient is zero, at Macquarie Island, Southern Ocean, correlation 0.73, negligible probability that the coefficient is zero, at Izanz, Tenerife, correlation 0.54, negligible probability that the coefficient is zero, at Ascension Island, correlation 0.48, negligible probability that the coefficient is zero, at Cape Ferguson, NE Australia, correlation 0.29, minute probability that the coefficient is zero but metal smelters operating in the vicinity, at Barrow, Alaska, correlation 0.54, small probability that the coefficient is zero, at Cape Kumukahi, Hawaii, correlation 0.67, minute probability that the coefficient is zero, at Cape Grim, NW Tasmania, correlation 0.64, negligible probability that the coefficient is zero, at Casey Base, Antarctica, correlation 0.19, 2 % probability that the coefficient is zero, temperature too cold for microbial activity?

The mix of these diffusion coefficients gives rise to a dispersive rise in temperature that has subtle differences from the rise expected with a single - valued diffusion coefficient.

The variation in subsurface and / or groundwater temperatures remains constant across seasons — typically around 55 °F, which allows ground - source heat pump systems to reach coefficients of performance of between 3 to 6.

at South Pole Base, Antarctica, correlation 0.10, 6 % probability that the coefficient is zero, temperature too cold for microbial activity?

Yet the correlation between temperature and log CO2 concentration since 1850 shows the expected straight line with a correlation coefficient of R + 0.91 of a maximum of 1.

That coefficient depends primarily on temperature, secondarily on salinity, and perhaps to some degree lost in the noise on isotopic weight.

i.e. sigma Ts ^ 4 = S (1 - a) / (1 - lambda / 2) where lambda is the atmospheric emissivity, a is the albedo (0.7), S the incident solar flux (340 W / m ^ 2), sigma is the SB coefficient and Ts is the surface temperature (288K).

For most cool - termperate climates, this means a heat transfer coefficient (U-value) of 0.15 W / (m ² K) at the most, i.e. a maximum of 0.15 watts per degree of temperature difference and per square metre of exterior surface are lost.

It is computed as the coefficient of proportionality between cumulative fossil fuel emissions and temperature.

The correlation coefficient for CO2 vs Temperature is either almost two or almost three times higher than the graph you posted.

Based on the estimated coefficients of mean temperatures in four regimes, we separate 78 cities into five areas with latitudes below 30 °, 31 ° -40 °, 41 ° -50 °, and 61 ° -70 °, and predict the impacts of future climate change on mortality for 2021 - 2040, 2041 - 2060, and 2061 - 2100.

Furthermore the AGW coefficients I use in place of Mike's sine waves are part of a formula based on the Arrhenius logarithm law for dependence of surface temperature on CO2, the exponential rise in CO2 observable in both the CDIAC data, and the Keeling curve.

From the paper: «In this model, it is assumed that the total radiative feedback can be described by a constant feedback coefficient λ multiplied by the globally averaged surface temperature anomaly.»

Jul 14, 2014 — Analysis: Solar activity & ocean cycles are the 2 primary drivers of climate, not CO2... The correlation of CO2 alone to global temperature is poor at only 44 %, not... The coefficients of determination are a measure of how accurately the....

I have removed all the temperature data where the transmission coefficient measured at Mauna Loa Observatory is outside of normal variation.

This would be because it's occuring at low temperatures and the coefficient of expansion gets smaller as it approaches 0 deg C.

A simple linear fit to the UAH temperature series gives a correlation coefficient of 0.53, while your fourth order polynomial gives 0.59.

This new product available at CERSAT consists of weekly and monthly gridded fields of CO2 exchange coefficients derived from scatterometer ocean surface winds and sea surface temperature, using severa...

When solving the quadratic the two exponential coefficients can be combined as ln (w) = ln (C0 / C1) then the quasi-equilibrium temperature is approximated by T = α ln (w)-- E / (k * ln (w)-RRB-

1) The differential form of Henry's Law says that the diffusion rate of a gas from water into the air is a function only of the concentration of the gas in the water (given the diffustion coefficient, which is constant for a constant temperature).

The global average temperature is just the coefficient of the (0,0) spherical harmonic, and the regression will give its standard error.

OD is basically the integral of the absorption coefficient (which depends on the quantum structure of the molecule, and the effects of temperature, and density) over distance.

The reason is that the Planck function change with height (temperature) is very strong in reducing the intensity of those relatively few lines with large absorption coefficients.

Figure 3, from Hansen & Lebedeff 1987 (apologies for the poor quality, this is an older paper) plots the correlation coefficients versus separation for the annual mean temperature changes between randomly selected pairs of stations with at least 50 common years in their records.

What of course Tamino doesn't reveal is if you do fit a ARIMA model and show the model fits over this period, what the temperature «trend» coefficient reduces to.

Despite the similar performance between the Brewer and Dobson stations, small differences within ± 0.6 % are introduced due to the use of different wavelengths and different temperature dependence for the ozone absorption coefficients [Staehelin et al., 2003].

The corresponding working quasilinear wave equation for the barotropic azonal stream function Ψm ′ of the forced waves with m = 6, 7, and 8 (m waves) with nonzero right - hand side (forcing + eddy friction) yields (34) u˜ ∂ ∂ x (∂ 2Ψm ′ ∂ x2 + ∂ 2Ψm ′ ∂ y2) + β˜ ∂ Ψm ′ ∂ x = 2Ω sin ϕ cos2 ϕT˜u˜ ∂ Tm ′ ∂ x − 2Ω sin ϕcos2 ϕHκu˜ ∂ hor, m ∂ x − (kha2 + kzH2)(∂ 2Ψm ′ ∂ x2 + ∂ 2Ψm ′ ∂ y2), [S3] where x = aλ and y = a ln -LSB-(1 + sin ϕ) / cos ϕ] are the coordinates of the Mercator projection of Earth's sphere, with λ as the longitude, H is the characteristic value of the atmospheric density vertical scale, T˜ is a constant reference temperature at the EBL, Tm ′ is the m component of azonal temperature at this level, u˜ = u ¯ / cos ϕ, κ is the ratio of the zonally averaged module of the geostrophic wind at the top of the PBL to that at the EBL (53), hor, m is the m component of the large - scale orography height, and kh and kz are the horizontal and vertical eddy diffusion coefficients.