Results 251 to 260 of about 1,420,872 (289)

Effects of Measurement Error on Horizontal Hydraulic Gradient Estimates

Groundwater, 2006
Abstract During the design of a natural gradient tracer experiment, it was noticed that the hydraulic gradient was too small to measure reliably on an ∼500‐m 2 site. Additional wells were installed to increase the monitored area to 26,500 m 2
J F, Devlin, C D, McElwee
openaire   +2 more sources

Generation of vertical–horizontal and horizontal–horizontal gravity gradients using stochastically modified integral estimators

Advances in Space Research, 2011
The Earth’s gravity field modelling is an ill-posed problem having a sensitive solution to the error of data. Satellite gravity gradiometry (SGG) is a space technique to measure the second-order derivatives of geopotential for modelling this field, but the measurements should be validated prior to use.
Mehdi Eshagh, Mohsen Romeshkani
openaire   +1 more source

Horizontal gradient freeze growth of AgGaGeS4 and AgGaGe5Se12

Journal of Crystal Growth, 2006
Abstract AgGaGeS 4 and AgGaGe 5 Se 12 are promising new nonlinear optical crystals for frequency-shifting 1-μm solid state lasers into the mid-infrared (2–12 μm) spectral range. The quaternary compounds were synthesized by vapor transport in sealed ampoules from high purity elemental starting materials, and crystals were grown by the horizontal ...
Peter G. Schunemann, Kevin T. Zawilski, Thomas M. Pollak   +2 more
openaire   +1 more source

Thermal Instability of Flows with a Horizontal Temperature Gradient

Physical Review Letters, 1997
The effect of horizontal heat advection on the thermal instability is studied for a general class of horizontal flows comprising forced and temperature-induced flow components as well as a possible net heat transport. The instability is usually triggered by an unstable layer of height ${h}_{u}$, which is caused by the nonlinear vertical temperature ...
Olaf Stiller, Wolfgang Schöpf
openaire   +1 more source

Double-diffusive interleaving on horizontal gradients

Journal of Fluid Mechanics, 2006
Results are presented from laboratory experiments on lateral intrusive flows driven by horizontal gradients of properties in double-diffusive systems. These are variations on the classical experiments in which salt stratified fluid was separated from a sugar stratified fluid by a removable barrier.
openaire   +1 more source

The Response of a Uniform Horizontal Temperature Gradient to Heating

Journal of the Atmospheric Sciences, 2007
Abstract The response of a uniform horizontal temperature gradient to prescribed fixed heating is calculated in the context of an extended version of surface quasigeostrophic dynamics. It is found that for zero mean surface flow and weak cross-gradient structure the prescribed heating induces a mean temperature anomaly proportional to ...
Panos J. Athanasiadis, Maarten H. P. Ambaum   +1 more
openaire   +1 more source

Horizontal wind fields and pressure gradient

Quarterly Journal of the Royal Meteorological Society, 1948
AbstractThe method adopted in deriving the geostrophic and gradient wind relations, that of specifying a wind field and deriving the pressure field from it, is extended to find pressure fields for other flow patterns. The motion is referred to contours of isobaric surfaces and the analysis is limited to motion in terms of Cartesian co‐ordinates. Simple
openaire   +1 more source

The Horizontal Temperature Gradient and the Increase of Wind with Height

Nature, 1917
IT has been known for some time past that from heights of about 1 to 9 km. the temperature is higher in the high pressure than in the low pressure area, and also that in general the wird, and especially the west wind, increases with height. The following simple proof shows that these two observational facts are not independent of each other, but that ...
openaire   +2 more sources

Horizontal Salinity Gradient Effects in Apalachicola Bay

Journal of Waterway, Port, Coastal, and Ocean Engineering, 1991
This research demonstrates that horizontal density gradients approximated by salinity gradient represent an additional forcing term in the equations of motion, which have a significant effect in certain portions of a well-mixed estuary. The horizontal density gradient terms have been added to a two-dimensional depth-averaged hydrodynamic and salinity ...
Kang‐Ren Jin, Donald C. Raney
openaire   +1 more source

Bifurcation of Dynamic Soaring at Horizontal Wind Gradient

2019 Chinese Control Conference (CCC), 2019
Dynamic soaring is a technique that seabirds like albatrosses use uneven natural winds in the atmosphere to extend the range without flapping the wings. To reveal the dynamic soaring mechanics, the equilibrium curve composed of equilibrium points are found in the model at the horizontal wind gradient.
Shangqiu Shan, Senlin Wang, Renwu Sun, Kun Hou   +3 more
openaire   +1 more source