scholarly journals Determination of formation specific NMR calibrations for water well evaluation in a semi-consolidated aquifer

2016 ◽  
Vol 2016 (1) ◽  
pp. 1-5
Author(s):  
P.J. Hawke ◽  
A. Harrild ◽  
E. Grunewald
Keyword(s):  
Water Well ◽  
Formation Specific

scholarly journals Determination of Filtration and Purification System for Flood Water Filter

2018 ◽  
Vol 7 (2.15) ◽  
pp. 8
Author(s):  
Nurul Aini Kamarudin ◽  
Mohd Khairul Amri Kamarudin ◽  
Rosalan Umar ◽  
Abdul Rahman Hassan ◽  
Fathurrahman Lananan ◽  
...  
Keyword(s):  
Contaminated Water ◽  
Clean Water ◽  
Pathogenic Microorganism ◽  
Flood Water ◽  
Water Filter ◽  
Dirty Water ◽  
Water Problem ◽  
Purification System ◽  
Water Well

Water is one of the basic needs which essential to life but cannot take it easy, it becomes more concern when a flood, there is plenty of dirty water than clean water, and the sources of the water are not approved to use. There are many kinds of waterborne pathogens which can donate diseases also death if not treating the water well before use. The treatment can be utilized based on the size of the microorganism. By identifying the size of the smallest bacteria will make easier to find the filtration based on the size of filter pores and other processes to ensure all the bacteria is removed and the water safe to use. Even there are many kinds of bacteria or microorganisms in the contaminated water, but the pathogens need to deal. The water will become clean and safe to use when the colour is clear and there is any pathogenic microorganism in there. This study is to ensure water is clean from pathogen after the flood water is filtered by know for sure the organism’s size and to overcome the lack of clean water problem during the flood and others purpose. 

scholarly journals Favorabilidade de aquíferos fraturados: Bacia Hidrográfica do Rio São Domingos - estado do Rio de Janeiro

2009 ◽  
Vol 32 (2) ◽  
pp. 51-61
Author(s):  
Luana Alves de Lima ◽  
Gerson Cardoso da Silva Jr ◽  
Juliana Magalhães Menezes ◽  
Vinícius Da Silva Seabra
Keyword(s):  
Information Systems ◽  
Geographic Information Systems ◽  
Water Resources ◽  
Rio De Janeiro ◽  
Well Location ◽  
Fractured Aquifers ◽  
Water Well ◽  
Northwestern Region ◽  
Janeiro State

Studies of aquifer favorability have been developed to reduce uncertainty in water well location and to define the hydrogeological potential of crystalline aquifers. The use of geoprocessing tools and Geographic Information Systems (GIS) proved efficient in determination of areas with a higher hydrogeological potential. The area of study is the São Domingos River Basin (SDRB), located in the Northwestern Region of Rio de Janeiro State, Brazil, including the entire São José de Ubá and a small part of Itaperuna municipalities. The main objective is to determine the hydrogeological favorability of the SDRB as a contribution to the management of the region's water resources, as well as elaborate a methodology to produce a cartography of hydrogeological favorability. As a result, hydrogeological favorability maps of SDRB were elaborated, comprising five classes of favorability, with two great domains: the central portion presenting classes of higher favorability and the upper basin with classes of lower favorability. The conclusions are: 1) favorability of the SDRB is strongly conditioned by the basin's geologic-structural settings; 2) the method used proved efficient in the evaluation of the fractured aquifers favorability.

scholarly journals NEW VOLTAMMETRIC METHOD FOR DETERMINATION OF PHENANTHRENE IN GROUNDWATER

2019 ◽  
Vol 16 (33) ◽  
pp. 169-177
Author(s):  
A. P. M. FERREIRA ◽  
E. J. N. TEIXEIRA ◽  
I. M. de OLIVEIRA ◽  
H. de A. PINHEIRO ◽  
A. L. B. MARQUES
Keyword(s):  
Differential Pulse ◽  
Good Alternative ◽  
Pulse Mode ◽  
Average Concentration ◽  
Good Precision ◽  
Average Value ◽  
Analytical Curve ◽  
Water Well ◽  
Optimized Conditions

This work proposes a new method for the determination of phenanthrene (FEN) in aqueous medium with a cobalt phthalocyanine modified glassy carbon electrode (ECV / CoPc), using Differential Pulse Voltammetry (VPD), whose oxidation of FEN occurs between 1,3 and 1,4 V. The electrode was modified with a 1x10-3 mol∙L-1 CoPc methanolic solution containing 10% Nafion. For voltammetric measurements in Differential Pulse mode, an amplitude of 0.7V and a scan rate of 0.04V s-1 were used. Experimental parameters were optimized for the purpose of determination of FEN in groundwater collected in a water well of a São Luis-MA fuel station. Under these optimized conditions, an analytical curve was obtained in the 0.49 to 2,4 μM concentration range, with a detection limit of 1,2 x 10-10 mol∙L-1. The method was applied to a real groundwater sample from a water well located at a fuel station, and an average concentration of 0.037 μM FEN was found (n = 5), presenting a variation coefficient of 0.88, indicating good precision. Accuracy was assessed by the recovery test, whose average value was 99.9%. These results indicate that the proposed procedure is a good alternative for the analysis of FEN in natural water.

ELECTRIC LOGGING APPLIED TO GROUND‐WATER EXPLORATION

Geophysics ◽  
1951 ◽  
Vol 16 (1) ◽  
pp. 115-139 ◽  
Author(s):  
P. H. Jones ◽  
T. B. Buford
Keyword(s):  
Ground Water ◽  
Gulf Coast ◽  
Salt Water ◽  
Drill Stem ◽  
Quality Of Water ◽  
Water Well ◽  
Open Hole ◽  
Log Interpretation

A method is described for the determination of the quality of ground water in granular aquifers penetrated by rotary‐drilled holes electrically logged. Conventional techniques of electric‐log interpretation, to determine true bed resistivity from apparent resistivity values, are briefly described; and a method for converting water‐resistivity values into hypothetical chemical analyses is explained. The objective of the method is to narrow the limits of error in quality‐of‐water estimates based upon electric logs. Water‐well contractors are fully aware of the risks attendant in making drill‐stem tests in open hole, which is the method now employed to obtain representative samples of formation water. Packer failure results in contaminated samples; hole collapse may mean loss of drill stem, screen, and the hole. In the Gulf Coast where water‐well tests range in depth from 100 to 3,000 feet, methods that will eliminate at least a part of the need for drill‐stem tests deserve consideration. The paper deals also with methods of determining formation porosity in situ, which is an important factor in salt‐water‐encroachment problems.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

International determination of the total motion of the pole

1961 ◽  
Vol 13 ◽  
pp. 29-41
Author(s):  
Wm. Markowitz
Keyword(s):  
Secular Motion ◽  
The Future

A symposium on the future of the International Latitude Service (I. L. S.) is to be held in Helsinki in July 1960. My report for the symposium consists of two parts. Part I, denoded (Mk I) was published [1] earlier in 1960 under the title “Latitude and Longitude, and the Secular Motion of the Pole”. Part II is the present paper, denoded (Mk II).

Time and Latitude in South Africa

1972 ◽  
Vol 1 ◽  
pp. 27-38
Author(s):  
J. Hers
Keyword(s):  
South Africa ◽  
Cape Town ◽  
Astronomical Observations ◽  
Royal Observatory ◽  
The Republic ◽  
Astronomical Determination ◽  
Limited Accuracy ◽  
Better Than

In South Africa the modern outlook towards time may be said to have started in 1948. Both the two major observatories, The Royal Observatory in Cape Town and the Union Observatory (now known as the Republic Observatory) in Johannesburg had, of course, been involved in the astronomical determination of time almost from their inception, and the Johannesburg Observatory has been responsible for the official time of South Africa since 1908. However the pendulum clocks then in use could not be relied on to provide an accuracy better than about 1/10 second, which was of the same order as that of the astronomical observations. It is doubtful if much use was made of even this limited accuracy outside the two observatories, and although there may – occasionally have been a demand for more accurate time, it was certainly not voiced.

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