Monitoring Well Construction: The Differences     

Ed Hillman 《Ground Water Monitoring & Remediation》1990,10(4):78-78

  相似文献   

Book review     

W. E. Sharp  Michael Ed. Hohn  W. B. Hempkins 《Mathematical Geosciences》1988,20(1):63-68

  相似文献   

Dammed and diversionary: The multi‐dimensional framing of Brazil's Belo Monte dam          下载免费PDF全文

Ed Atkins 《Singapore journal of tropical geography》2017,38(3):276-292

Belo Monte is one of the most divisive dams in Brazilian history, becoming entangled in a thirty‐year struggle between pro‐ and anti‐dam interests over the role of the facility within a complex web of Brazilian development and the future of the Brazilian Amazon. This research explores how the proponents of Belo Monte have adopted a number of policy frames as a means of deflection, to divide the opposition and legitimize the project. It investigates this claim by analyzing speeches given within the Brazilian Câmara dos Deputados and the public speeches of high‐level politicians. These sources, organized around a framework previously identified by Ahlers et al. ( 2014 ), show that the government and individual politicians have used a variety of framing devices to legitimize the hydroelectric facility. Principal methods of framing used also demonstrate how contemporary narratives (e.g. sustainability) have been employed to deflect opposition criticism and widen the scheme's perceived beneficiaries. In doing so, this paper demonstrates how the transformation represented by Belo Monte encompassed not only a process of engineering but also a re‐articulation of the complex and its role in modern Brazil.  相似文献   

Spaceborne ultraviolet 251–384 nm spectroscopy of a meteor during the 1997 Leonid shower     

Peter Jenniskens  Ed Tedesco  Jayant Murthy  Christophe O. Laux  Stephen Price 《Meteoritics & planetary science》2002,37(8):1071-1078

Abstract— We used the ultraviolet to visible spectrometers onboard the midcourse space experiment to obtain the first ultraviolet spectral measurements of a bright meteor during the 1997 Leonid shower. The meteor was most likely a Leonid with a brightness of about‐2 magnitude at 100 km altitude. In the region between 251 and 310 nm, the two strongest emission lines are from neutral and ionized magnesium. Ionized Ca lines, indicative of a hot T ? 10 000 K plasma, are not detected. The Mg and Mg+ line intensity ratio alone does not yield the ionization temperature, which can be determined only by assuming the electron density. A typical air plasma temperature of T = 4400 K would imply a very high electron density: n_e = 2.2 times 10¹⁸ m‐³, but at chondritic abundances of Fe/Mg and Si/Mg ? 1. For a more reasonable local‐thermodynamic‐equilibrium (LTE) air plasma electron density, the Mg and Mg+ line ratio implies a less than chondritic Fe/Mg = 0.06 abundance ratio and a cool non‐LTE T = 2830 K ionization temperature for the ablation vapor plasma. The present observations do not permit a choice between these alternatives. The new data provide also the first spectral confirmation of the presence of molecular OH and NO emission in meteor spectra.  相似文献   

The 2dF Galaxy Redshift Survey: the nature of the relative bias between galaxies of different spectral type     

Edward Conway  Steve Maddox  Vivienne Wild  John A. Peacock  Ed Hawkins  Peder Norberg  Darren S. Madgwick  Ivan K. Baldry  Carlton M. Baugh  Joss Bland-Hawthorn  Terry Bridges  Russell Cannon  Shaun Cole  Matthew Colless  Chris Collins  Warrick Couch  Gavin Dalton  Roberto De Propris  Simon P. Driver  George Efstathiou  Richard S. Ellis  Carlos S. Frenk  Karl Glazebrook  Carole Jackson  Bryn Jones  Ofer Lahav  Ian Lewis  Stuart Lumsden  Will Percival  Bruce A. Peterson  Will Sutherland  Keith Taylor 《Monthly notices of the Royal Astronomical Society》2005,356(2):456-474

We present an analysis of the relative bias between early- and late-type galaxies in the Two-degree Field Galaxy Redshift Survey (2dFGRS) – as defined by the η parameter of Madgwick et al., which quantifies the spectral type of galaxies in the survey. We calculate counts in cells for flux-limited samples of early- and late-type galaxies, using approximately cubical cells with sides ranging from 7 to  42 h ⁻¹ Mpc  . We measure the variance of the counts in cells using the method of Efstathiou et al., which we find requires a correction for a finite volume effect equivalent to the integral constraint bias of the autocorrelation function. Using a maximum-likelihood technique we fit lognormal models to the one-point density distribution, and develop methods of dealing with biases in the recovered variances resulting from this technique. We then examine the joint density distribution function,   f (δ_E, δ_L)  , and directly fit deterministic bias models to the joint counts in cells. We measure a linear relative bias of ≈1.3, which does not vary significantly with ℓ. A deterministic linear bias model is, however, a poor approximation to the data, especially on small scales  (ℓ≤ 28  h ⁻¹ Mpc)  where deterministic linear bias is excluded at high significance. A power-law bias model with index   b ₁≈ 0.75  is a significantly better fit to the data on all scales, although linear bias becomes consistent with the data for  ℓ≳ 40  h ⁻¹ Mpc  .  相似文献   

Characterizing Atmospheric Aerosols off the Atlantic Canadian Coast During C-FOG     

Chisholm  Nicole  Nagare  Baban  Wainwright  Charlotte  Creegan  Ed  Salehpoor  Leyla  VandenBoer  Trevor C.  Bullock  Terry  Croft  Betty  Lesins  Glen  Osthoff  Hans  Fernando  H. J. S.  Chang  Rachel Y.-W. 《Boundary-Layer Meteorology》2021,181(2-3):345-364

Boundary-Layer Meteorology - Marine aerosols play an important role in the Earth’s climate, but their effects remain highly uncertain due to a poor understanding of their sources, properties,...  相似文献   

Circular plumes in Lake Pontchartrain estuary under wind straining     

Chunyan Li  Nan Walker  Aixin Hou  Ioannis Georgiou  Harry Roberts  Ed Laws  J. Alex McCorquodale  Eddie Weeks  Xiaofeng Li  Jessica Crochet 《Estuarine, Coastal and Shelf Science》2008

Circular shaped density plumes of low turbidity, low fecal indicator (Escherichia coli and enterococci) concentrations, and high salinity have been observed near the Industrial Canal in Lake Pontchartrain, north of the City of New Orleans. A conceptual model in polar coordinates and a numerical model are developed, together with data analysis, to illustrate the dense plume. It is demonstrated that the northward expansion of the plume occurs under northerly winds. The northward expansion of the plume occurs under northerly winds that drive downwind flow at the surface and upwind radial flow at the bottom. Northerly wind-induced straining, similar to tidal straining, promotes vertical stratification. As a result, the water becomes stratified near a thin bottom layer (<1 m), within which density currents are facilitated. The stability of the stratified plume suppresses wind-induced turbulent mixing inside the plume. The bottom water outside of the plume is more effectively stirred by the wind, the result being that the suspended sediment concentration outside of the plume area is much higher than inside. This contrast in mixing makes the plume visible from the surface by satellites even though the stratification is at the bottom. Laterally, wind stress produces a torque (vorticity) in areas of non-uniform depth such that upwind flow is developed in deep water and downwind flow in shallow water. The continuity requirement produces an upwind flow along the axis of the Industrial Canal (IC). The upwind flow is balanced by the downwind flow over the shallower peripheral areas along the coast.  相似文献   

An experimental investigation of geochromatography during secondary migration of petroleum performed under subsurface conditions with a real rock     

Steve Larter  Berni Bowler  Ed Clarke  Colin Wilson  Brian Moffatt  Barry Bennett  Gareth Yardley  Dan Carruthers 《Geochemical transactions》2000,1(1):54-7

  相似文献   

Die Windverhältnisse am Bodensee     

Ed. Huss  D. Stranz 《Pure and Applied Geophysics》1970,81(1):323-356

Summary Within the programme sponsored by the Deutsche Forschungsgemeinschaft (Bad Godesberg) in which different branches of scientific disciplines cooperated in order to investigate Lake Constance in Southern Germany, meteorology was mainly dealing with the wind situation round the Lake.Investigations by the Aerological Observatory of Friedrichshafen which was destroyed during the last war, yielded fundamental contributions to the problem of air currents on the Lake and in the outer regions of the Alps in its vicinity. With regard to the various problems in the common achievements of the Lake Constance Project of the Deutsche Forschungsgemeinschaft it proved necessary to extend the investigations across the whole region of the Lake in order to elaborate the synoptic situations of the daily and annual periodical wind systems.The vertical structure of the air currents could not be inferred but by an indirect manner, whilst its confirmation by direct aerological means is going to be studied in an additional research programme. The results of the comprehensive observational material of several years will be published in a final report by the Deutsche Forschungsgemeinschaft.Here some special results of the wind observations are presented.  相似文献   

Les végétaux (Macrofossiles) du crétacé moyen de l'Europe occidentale et du Sahara. Végétations et paléoclimats     

C. Alvarez-Ramis  Ed. Biondi  D. Desplats  N. F. Hughes  J. C. Koeniguer  D. Pons  M. Rioult 《Cretaceous Research》1981,2(3-4)

Cette note expose un ensemble de synthèses régionales sur les thèmes suivants: les macrofossiles de l'Angleterre; les bois de l'Albien du Boulonnais; les végétaux de Normandie du Crétacé moyen; les milieux forestiers littoraux du Cénomanien inférieur de l'Anjou et des Charentes; les macroflores du Crétacé moyen continental de l'Espagne; les gisements de l'Italie et du Sahara.L'esquisse d'une évolution possible de quelques végétations de ces contrées est proposée, ainsi que les arguments paléoclimatiques que l'on peut en déduire.This paper presents a regional synthesis concerning mid-Cretaceous plant megafossils from England, Normandy, Northern and Western France, Spain, Italy, and the Sahara. A possible evolution pattern is offered for these floras during mid-Cretaceous time; some climatic arguments are presented.  相似文献