Where results make sense

About us   |   Why use us?   |   Reviews   |   PR   |   Contact us

Temperature Patterns Temperatures on the Earth are largely dependent upon how much energy is received from the Sun, which varies both with latitude on the Earth and the time of year. This latitudinal temperature gradient however, generates a global transfer of heat from equator to poles via the general circulation of winds, such that the equator is kept cooler and the poles warmer than they would be if the Earth had no atmosphere. Differences between wintertime and summertime temperatures tend to be greatest in higher latitudes, and particularly in the interior of large landmasses such as North America and Asia far from the moderating influence of the oceans. www.ace.mmu.ac.uk /eae/Climate/Older/Temperature_Patterns.html   (367 words)

Temperature Gradient Temperature gradient is a very important in the snowpack because when temperature changes more than about 1 degree centigrade per 10 centimeters, the snow metamorphoses into weak, sugary, faceted crystals, which cause the lion’s share of avalanche accidents. Large temperature gradients usually occur when cold, clear weather causes the snow surface to become very cold, or if the snow is especially shallow—or both. (See faceted snow.) Luckily, temperature gradient metamorphism is completely reversible; when you take away the temperature gradient, the crystals start to metamorphose back into rounded, well-bonded grains. www.avalanche.org /~uac/encyclopedia/temperature_gradient.htm   (104 words)

Temperature gradient - Wikipedia, the free encyclopedia The temperature gradient in a given direction from a given spatial starting point is the rate at which temperature changes relative to distance in that direction from that point. The world temperature gradient is the rate at which temperature changes between the Earth's poles and the equator. In each hemisphere the temperature gradient from pole to equator is steeper in that hemisphere's winter than in its summer. en.wikipedia.org /wiki/Temperature_gradient   (113 words)

World temperature gradient World temperature gradient refers to the change in temperature that exists in the atmosphere from the equator to the poles. The change in temperature or temperature differential, which causes atmospheric circulation can be compared to the temperature differences produced in a pan of water placed over a gas burner. The weak temperature gradient in the sub-tropical areas and the steeper gradient poleward can be seen in figures 3-1-2A and 3-1-2B. www.tpub.com /weather2/3-2.htm   (556 words)

temperature - Definitions from Dictionary.com The temperature of a substance is closely related to the average kinetic energy of its molecules. When any two substances of different temperatures are in thermal contact, the laws of thermodynamics state that heat flows from the higher-temperature substance into the lower-temperature substance, raising the temperature of the heated body and lowering the temperature of the body releasing heat until thermal equilibrium is reached, and the temperatures are the same. Temperature can be related to the average kinetic energy of the molecules of gases, though this relation breaks down in most real cases involving liquids, solids, substances with larger molecules, and radiation with no mass, such as light. dictionary.reference.com /browse/temperature   (816 words)

LAKE-EFFECT SNOW FORECASTING The temperature difference between the lake and the 850 millibar level is usually greater than 13° C for significant lake-effect snow to occur. This profile depends on the temperature of the air and lake water, the wind speed, and the thickness of the cold air mass. The temperature gradient between the cold air and the warmer water is important. www.theweatherprediction.com /winterwx/lesnow   (1606 words)

BridgeTalk (tm) Discussion Forum - "temperature gradient loading acc to AASHTO LRFD "   (Site not responding. Last check: 2007-09-08) That is why LRFD reduce the moments due to temperature gradient, i.e, to enlarge the effects of live load moments. Thermal gradients shall be applied only at service load combinations, and when combined with live load plus impact (LL+I), a beta factor of 0.5 will be applied to the gradient load as per. Temperature gradient for zone 1 in accordance with shall be applied. www.bridgesite.com /dcforum/DCForumID1/72.html   (888 words)

Minimum Film Formation Temperature Tester (MFFT) By heating and cooling the measuring plate any variable temperature gradient within the range of -30°C to +250°C can be produced and kept constant for any given period. The temperature can be controlled by the integrated electronic temperature measuring instrument with a digital display and measuring-point selector over the entire range. To determine the minimum film forming temperature "MFT" the specimens are applied to the measuring plate by a film coating appliance and protected from ambient air by a covering cap. www.qualitest-inc.com /mfft.htm   (329 words)

Temperature Gradient Maps For example, an area of Eastern temperature gradients (temperature increases from east to west) on the eastern side of some large hills may not be manifested in observed winds because those winds may be blocked by those hills. Strong gradients near the ocean are not physically significant because the temperatures at the ocean were not treated properly in the calculations. The larger gradients are observed in an area in the center of the highlands which is incised by passes which are low enough for the cool Red Sea air to pass through. www.punchdown.org /rvb/meteo/tgradexp.html   (1236 words)

Contact Temperature Sensors-A brief summary of the different kinds of contact temperature sensors organized by ... One infers the temperature of the object to which the sensor is in contact by assuming or knowing that the two are in thermal equilibrium, that is, there is no heat flow between them. Temperatures of surfaces are especially tricky to measure by contact means and very difficult if the surface is moving. Surface temperature measurent problem can be solved in many cases through the use of non-contact sensors; they are almost ideal for those types of applications and are in use in many industrial plants worldwide in great numbers. www.temperatures.com /csensors.html   (641 words)

Temperature Air temperature is a measure of the heat content of the air. The temperature of our atmosphere is controlled by a complex set of interactions between the biosphere, lithosphere and atmosphere. The annual variation in temperature increases away from the equator and a noticeable double maximum of temperatures occurs. www.uwsp.edu /geo/faculty/ritter/geog101/uwsp_lectures/lecture_atmospheric_temperature.html   (347 words)

THE LOW LEVEL JET The reverse in the temperature gradient is caused by warming of surface air. Temperatures are cold over the western Great Plains while they are much warmer in the warm sector across the eastern Great Plains. The strong pressure gradient force is caused by large temperature gradient between the cold air behind the cold front and warm air ahead of the cold front. theweatherprediction.com /severe/llj   (668 words)

Electrocube - Support Fundamentally, prior to the generation of heat energy, the capacitor is in a state of temperature equilibrium with the surrounding environment. During the process, some heat energy will be dissipated by conduction through the lead connections, some energy is used in the process of establishing the temperature gradient, while the remainder of the energy is conducted to the outside surfaces of the capacitor. The extent or level of this steady-state temperature gradient will depend on the speed and ability of the capacitor and its environment to dissipate the heat energy as it is generated. www.electrocube.com /support/bullet8.asp   (2787 words)

The weak temperature gradient approximation   (Site not responding. Last check: 2007-09-08) One thing we know with great certainty is that on the average, horizontal virtual temperature gradients and time tendencies are small in the free atmosphere of the deep tropics. Second, the strong differential heating tendencies that occur as a consequence of, say, land-sea contrasts or strong sea surface temperature (SST) gradients, result in corresponding horizontal temperature gradients in the atmospheric boundary layer. The weak virtual temperature gradients mean that free tropospheric temperature soundings are quite similar throughout the tropics. www.physics.nmt.edu /~raymond/papers/tropfcst/node2.html   (304 words)

Temperature Gradient: Information on Temperature This work was motivated by trying to better understand the infinitesimal gradient ascent algorithm, and the techniques developed were applied to that problem to establish an extension to infinitesimal gradient ascent that is universally consistent. The gradient is not the same as the axis of a font, but is obviously affected by the degree of contrast. There is a strong social gradient in the metabolic syndrome, which is not caused by differences in psychosocial or lifestyle factors... temperaturegradient.mouetemperature.com   (1266 words)

EarthStorm a chart containing isopleths (contours) of pressure, temperature, moisture, and potential temperature, all drawn relative to each other such that basic thermodynamic laws are satisfied (e.g., conservation of energy). an instrument for measuring temperature consisting typically of a glass bulb attached to a fine tube of glass with a numbered scale and containing a liquid that is sealed in and rises and falls with changes of temperature The thin line is caused by backscattering of the radar's pulse off of a gradient in the index of refraction of air (i.e, a sharp contrast in air density across a short distance). earthstorm.ocs.ou.edu /materials/t.php   (896 words)

ipedia.com: Thermal conductivity Article   (Site not responding. Last check: 2007-09-08) The thermal conductivity of a material is equivalent to the quantity of heat that passes in unit time through unit area of a plate, when its opposite faces are subject to unit temperature gradient (e.g. Since diamond has such a high thermal conductivity, natural blue diamond much higher still, one may test gems to determine if they are genuine diamonds using a thermal conductance tester, one of the instruments of gemology. For general scientific use [2]class="external" target="_blank">[1, thermal conductance is the quantity of heat that passes in unit time through a plate of particular area and thickness when its opposite faces differ in temperature by one degree. www.ipedia.com /thermal_conductivity.html   (557 words)

Happy Turtle Site - Online Pet Turtle Information Site In their natural habitats a wide range of temperature zones are available, in a gradient between dry, warm, sunny places and moist, cooler, shady nooks. While it is difficult to provide the wide range of temperature and humidity zones in a captive habitat we can definitely try and provide a temperature gradient so that the turtles can manage their body temperature requirements themselves. A moderate temperature gradient can be created from the land area side end the tank to the other quite easily. happyturtle.ms11.net /temperature.html   (558 words)

microscope stage temperature gradient heating and cooling system With this peltier based temperature gradient stage it is possible to program extremely accurate gradients across the sample. Linksys software enables the precision stepper motor to control the position and the speed of sample movement between the two elements and can be used to determine speed of crystal growth and allow the crystallisation front to remain in the field of view. Circulating water is all that is needed for the thermoelectric reduction in temperature. www.linkam.co.uk /specificapps/temperature_gradient_system.html   (247 words)

Temperature Gradient Focusing   (Site not responding. Last check: 2007-09-08) Temperature gradient focusing (TGF) involves application of a temperature gradient across a microchannel or capillary. With an appropriate buffer, the temperature gradient creates a gradient in both the electric field and the electrophoretic velocity. This is accomplished by balancing the electrophoretic velocity against the bulk flow of a temperature dependent buffer. www.nist.gov /sigmaxi/Posters04/balss.html   (246 words)

Homogeneous isotropic flow with/without mean temperature gradient -- DNS by Iida and Kasagi The numerical databases to be analysed are of decaying homogeneous anisotropic turbulence with a mean temperature gradient. With the same flow field, a constant mean temperature gradient, which would create a turbulent heat flux, was imposed in two different directions. The mean temperature gradient was assumed in the y- and z-directions in Cases 1 and 2, respectively. cfd.me.umist.ac.uk /ercofold/database/test47/test47.html   (307 words)

Physics4Kids.com: Thermodynamics & Heat: Energy Transfer The area where the temperature is lower is the heat sink. The gradient is the change in temperature divided by the distance. When the transfer of energy happens by radiation, a temperature gradient exists and there is no conductive medium. www.physics4kids.com /files/thermo_transfer.html   (519 words)

2.4 Air temperature gradient This gives the effect of the particles rising as if they were only affected by the temperature and convection currents, without any regard for the wind or other effects. It is hoped that these visualisations will exhibit differences since they are from different temperature conditions -- the midday case should be the warmest (at least at ground level), followed by the evening and then the early morning. This is attributed to the fact that the earth is spinning underneath, and the temperature is the temperature of the air at these points -- hence, this may drift slightly with respect to the earth below. oldsite.vislab.usyd.edu.au /education/sv3/1999/kevin/node9.html   (339 words)

THE TEMPERATURE GRADIENT AND PRESSURE GRADIENT   (Site not responding. Last check: 2007-09-08) The temperature gradient is defined as the change in temperature over the change in distance, dT/dx. The pressure gradient is defined as the change is pressure over the change in distance, dP/dx. a) The temperature at point A is 10 C, the temperature at point B is 20 C, and point A is 100 km from point B. What is the temperature gradient? www.theweatherprediction.com /habyhints/199   (155 words)

Temperature: Geothermal Gradient vs. Tectonic Setting The average geothermal gradient of the earth is about 25°C/km. Temperature increases quickly with depth, due to rising hot magma beneath. Temperature increases slowly with depth, ie: cool rocks are found deeper in the earth. www.eos.ubc.ca /courses/eosc221/meta/gradient.html   (138 words)

The Temperature Gradient in Coronal Holes The goal is to measure the temperature of the upper corona as a function of height above the solar limb, especially in open--field (coronal hole) regions. Thus the determination of the temperature gradient in the 1 R The temperature gradient can be determined by measuring the Doppler widths of several spectral lines at various positions above the limb. www.cfa.harvard.edu /uvcs/yb/node65.html   (520 words)

The Temperature Gradient in Coronal Holes The goal is to measure the temperature of the upper corona as a function of height above the solar limb, especially in open--field (coronal hole) regions. Thus the determination of the temperature gradient in the 1 R The temperature gradient can be determined by measuring the Doppler widths of several spectral lines at various positions above the limb. cfa-www.harvard.edu /uvcs/yb/node65.html   (520 words)

Thermocouple Temperature Sensors, how they work, color codes, recommended limits, limits of accuracy, calibration ... Thermocouples are among the easiest temperature sensors to use and obtain and are widely used in science and industry. Thermocouples can err in reading their own temperature, especially after being used for a while, or if the insulation between the wires loses its resistance due to moisture or thermal conditions, or there are chemical, nuclear radiation or mechanical effects with the immediate surroundings. Thermocouples are pairs of dissimilar metal wires joined at least at one end, which generate a net thermoelectric voltage between the the open pair according to the size of the temperature difference between the ends, the relative Seebeck coefficient of the wire pair and the uniformity of the wire-pair relative Seebeck coefficient. www.temperatures.com /tcs.html   (1044 words)

ECS EPrints Service - Space Charge Measurements in XLPE Cable with a Temperature Gradient To reflect the normal operating conditions of dc cables, space charge measurements were carried out at elevated temperature with a temperature gradient of 13 oC across its insulation. Space charge measurements at room temperature on as-received XLPE cable and degassed cable revealed that the former showed a very slow charge accumulation but with a high stability, whilst the degassed sample showed little space charge formation in the bulk of the insulation. Further investigation into the effects of voltage polarity reversal on space charge at room temperature and elevated temperature indicated that the polarity change in dc transmission could pose a major thread to the cable insulation in the presence of space charge. eprints.ecs.soton.ac.uk /8527   (502 words)

Try your search on: Qwika (all wikis)

About us   |   Why use us?   |   Reviews   |   Press   |   Contact us   Copyright © 2005-2007 www.factbites.com Usage implies agreement with terms.