UNDERGROUND AND SURFACE GRAVITY SURVEY, LEADWOOD, MISSOURI

Geophysics ◽  
1961 ◽  
Vol 26 (2) ◽  
pp. 158-168 ◽  
Author(s):  
S. T. Algermissen
Keyword(s):  
Surface Gravity ◽  
Gravity Survey ◽  
The North ◽  
Anomalous Density ◽  
Principal Factors ◽  
Mine Workings ◽  
Four Square

A surface gravity survey consisting of 214 stations covering approximately four square miles was conducted over and adjacent to the North Leadwood Mines at Leadwood, Missouri. A corresponding survey of 278 stations was carried out in the mine workings. A method of reducing underground gravity observations is outlined. The principal factors limiting the accuracy of the underground observations are given. Methods for determining rock densities are described. A comparison of the surface and underground gravity maps shows that major Precambrian knobs were revealed by both surveys. Smaller structures not shown on the surface map were revealed by the underground survey. Anomalous density areas between the level of the two surveys were easily located.

scholarly journals Evaluation of two earth–air heat exchangers efficiency of different pipe materials within a warm temperate climate

2020 ◽  
Vol 307 ◽  
pp. 01028
Author(s):  
Mohammed Cherif LEKHAL ◽  
Abderahmane Mejedoub MOKHTARI ◽  
Rafik BELARBI
Keyword(s):  
Energy Performance ◽  
Temperate Climate ◽  
Airflow Rate ◽  
Outlet Temperature ◽  
Pipe Material ◽  
Cooling Mode ◽  
The North ◽  
Heating And Cooling ◽  
Principal Factors ◽  
Warm Temperate

The Earth-Air Heat Exchanger (EAHE) system was used for many years for both primary heating and cooling applications, especially in the building sector. Its energy performance can be influenced by three principal factors: the EAHE pipe material, the airflow rate, the soil characteristics and the moisture content. The state of the art shows a divergence about the effect of the pipe material on the performance of the EAHE. The aim of this study is to provide an adequate response to this problematic based on experimental analysis. In this regard, we tested two EAHEX of different materials: PVC and Zinc. The comparative study was conducted under a warm temperate climate in the north of Algeria. The data analyses showed that the pipe material can significantly affect the EAHE performance during periods when the EAHE passes from heating to cooling mode. Furthermore, the air outlet temperature differences provided by EAHE Zinc and those of PVC up to about 7.5°C.

X.—A Gravity Survey in Ayrshire and its Geological Interpretation

1966 ◽  
Vol 66 (10) ◽  
pp. 239-265 ◽  
Author(s):  
Adam C. McLean
Keyword(s):  
Gravity Field ◽  
Bouguer Anomaly ◽  
Gravity Survey ◽  
Normal Faults ◽  
Red Sandstone ◽  
Geological Interpretation ◽  
The North ◽  
Close Relationship ◽  
Lower Palaeozoic ◽  
Western Limb

SynopsisBouguer anomaly maps covering most of Ayrshire at a density of about one station per sq. km., show a close relationship between anomalies and the distribution of the Upper Palæozoic rocks in the area south of the Inch-gotrick Fault, but are less clearly interpreted to the north, where thick dense igneous masses are present.In central and south Ayrshire the gravity field may be largely interpreted in terms of the known density-contrasts at the interfaces separating Upper and Lower Old Red Sandstone, and Lower Old Red Sandstone and Lower Palæozoic rocks. The major structure, the Mauchline Basin, is reflected clearly in the largest anomaly, and there is evidence of a culmination of its south-western limb near Kirkoswald. The important N.E.–S.W. faults also give rise to large anomalies, which may be connected with the known geology. It is inferred that they moved as normal faults in Carboniferous times, and that the adjacent synclines are essentially sags associated with the fault displacements. There is geophysical evidence that both the Southern Upland and Kerse Loch Faults existed in Middle O.R.S. (proto-Armorican) times. It is concluded that a hypothesis of N.–S. Armorican stress is not valid in south Ayrshire.In north Ayrshire, many of the anomalies are best explained by changes of thickness of the Millstone Grit lavas and of the Clyde Plateau lavas, and by the presence of thick dolerite intrusions. Additional evidence is needed, however, before final conclusions may be drawn.

Ice surface gravity survey in river and lake areas and its applications

2018 ◽  
Author(s):  
Yang Zhanjun ◽  
Li Dechun ◽  
Li keyi ◽  
Li Zhao
Keyword(s):  
Surface Gravity ◽  
Gravity Survey ◽  
Ice Surface

Phytoplankton Succession and Primary Production in Babine Lake, British Columbia

1975 ◽  
Vol 32 (12) ◽  
pp. 2413-2427 ◽  
Author(s):  
John G. Stockner ◽  
K. R. S. Shortreed
Keyword(s):  
Primary Production ◽  
Sockeye Salmon ◽  
Mixed Layer Depth ◽  
Carbon Assimilation ◽  
Annual Production ◽  
Phosphate Limitation ◽  
The South ◽  
South Basin ◽  
The North ◽  
Principal Factors

Ten stations located in six zones (subbasins) were sampled biweekly from May to October 1973 to detect possible regional differences in production in this large, 155 km long, dystrophic lake. The spring bloom occurred in all zones while a fall bloom occurred only in Zones 5 and 6. Carbon assimilation showed two peaks in south basin zones, but only one (spring) at zones north of Topley Landing. Seasonal variation in phytoplankton numbers and volume, seston, and chlorophyll a followed a pattern similar to that noted for primary production. Mean production was 100 mg C∙m−2∙day−1 in Zones 1–4, but was 145 in Zones 5 and 6. Annual production was estimated at 25 g C∙m−2 in the north basin and 40 in the south basin. Reasons for the regional disparities are discussed, with greatest significance given to regional variations in mixed layer depth, surface inflows (loading), and basin mean depth. The development and sustainment of the autumnal bloom of Tabellaria fenestrata is thought to be one of the principal factors responsible for greater production in the south basin.An estimated 0.05 g TP∙m−2 enters the lake yearly. This can vary depending on the return of adult sockeye salmon (Oncorhynchus nerka), whose carcasses contribute up to 20% of the total. An estimated 30% is lost via the Babine River, and it is speculated that of the remaining 70%, most is lost to the sediments. Phosphate limitation is implied as a chief factor limiting primary production in the north basin stations, but not in the south basin. On the basis of total phosphorus load the lake is classed as oligotrophic, but in terms of annual production and its humic stained waters it is more correctly considered mixotrophic.

Performing a High Resolution surface Gravity Survey to Monitor the Gas Cap Water Injection Project, Prudhoe Bay, Alaska

2002 ◽  
Author(s):  
Jerry L. Brady ◽  
John F. Ferguson ◽  
Carlos V.L. Aiken ◽  
John E. Seibert ◽  
Tianyou Chen ◽  
...  
Keyword(s):  
High Resolution ◽  
Water Injection ◽  
Surface Gravity ◽  
Gravity Survey ◽  
Prudhoe Bay

“Guns Plus Interest”

2019 ◽  
pp. 64-96
Author(s):  
Yelena Biberman
Keyword(s):  
Balance Of Power ◽  
The State ◽  
Local Power ◽  
Kashmir Valley ◽  
The South ◽  
Jammu And Kashmir ◽  
Security Forces ◽  
The North ◽  
Principal Factors ◽  
Defense Committees

This chapter shows that the principal factors driving the state-nonstate alliances in Kashmir (1989–2003) were the local balance of power and actors’ interests. It was only when the Indian army demonstrated force employment prowess through a string of military victories that it was able to attract opportunists. These were former rebels seeking local power, profit, and security. The proxies—most notably the Ikhwan-ul-Muslimoon in the north, as well as the Jammu and Kashmir Ikhwan and Muslim Mujahideen in the south of the Kashmir Valley—helped to shift the balance of power in India’s favor. This prompted the insurgency to move to the mountainous Jammu region. There, the security forces turned to local activists. These, mostly Hindu, villagers formed the so-called Village Defense Committees.

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