Determination of soil permeability in situ.

1955 ◽  
Vol 3 (2) ◽  
pp. 119-126
Author(s):  
H.J. Timmers
Keyword(s):  
Fourier Analysis ◽  
Stationary Flow ◽  
Water Levels ◽  
Average Thickness ◽  
Soil Permeability ◽  
Storage Coefficient ◽  
Western Side ◽  
River Ijssel

The theory of non-stationary flow has, been applied to the movement of water in the upper layers of the Pleistocene terrace on the western side of the river IJssel. A Fourier analysis of the movement of the water levels in the river and in several wells permitted calculation of the ratio of permeability to the storage coefficient of the soil. Assuming that the storage coefficient was o. I0 and the average thickness of the aquifer was I5 m, the average permeability was calculated to be 53 m/day. The discharge of water from the soil (0.8 cu m/day) can be calculated without knowing the thickness of the aquifer. The method can be used to calculate the amount of water needed for irrigation and the amount of water percolating from the hinterland to the river. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Determination of radon index on the test site “Botanical Garden − BAS”, Sofia

2020 ◽  
Vol 81 (3) ◽  
pp. 209-211
Author(s):  
Dimitar Antonov ◽  
Kremena Ivanova ◽  
Bistra Kunovska ◽  
Sava Kolev ◽  
Monika Mutovska ◽  
...  
Keyword(s):  
Fault Zone ◽  
Test Site ◽  
Botanical Garden ◽  
In Situ Measurements ◽  
Soil Permeability ◽  
Radon Activity ◽  
Radon Content

The study deals with pilot investigations of the radon index in Bulgaria. In situ measurements of the radon activity and soil permeability at 3 sites one over and two – close to fault zone have been performed. The results show that higher radon content is detected in the fault zone.

INDIREKTE PAPIERCHROMATOGRAPHISCHE METHODE ZUR BESTIMMUNG DER HARNOESTROGENE

1961 ◽  
Vol 38 (4) ◽  
pp. 545-562 ◽  
Author(s):  
L. Kecskés ◽  
F. Mutschler ◽  
I. Glós ◽  
E. Thán ◽  
I. Farkas ◽  
...  
Keyword(s):  
Pregnant Women ◽  
Granulosa Cell ◽  
Iron Content ◽  
List Type ◽  
Granulosa Cell Tumour ◽  
Hydrolysis Of ◽  
Phenol Fraction ◽  
Qualitative Determination

ABSTRACT 1. An indirect paperchromatographic method is described for separating urinary oestrogens; this consists of the following steps: acidic hydrolysis, extraction with ether, dissociation of phenol-fractions with partition between the solvents. Previous purification of phenol fraction with the aid of paperchromatography. The elution of oestrogen containing fractions is followed by acetylation. Oestrogen acetate is isolated by re-chromatography. The chromatogram was developed after hydrolysis of the oestrogens 'in situ' on the paper. The quantity of oestrogens was determined indirectly, by means of an iron-reaction, after the elution of the iron content of the oestrogen spot, which was developed by the Jellinek-reaction. 2. The method described above is satisfactory for determining urinary oestrogen, 17β-oestradiol and oestriol, but could include 16-epioestriol and other oestrogenic metabolites. 3. The sensitivity of the method is 1.3–1.6 μg/24 hours. 4. The quantitative and qualitative determination of urinary oestrogens with the above mentioned method was performed in 50 pregnant and 9 non pregnant women, and also in 2 patients with granulosa cell tumour.

Single Crystal Growth of High-Pressure Phases of Ice and Salt Hydrate Far Below the Original Melting Point by Mixing Alcohol: Crystal Structure Determination of Magnesium Chloride Heptahydrate

2020 ◽  
Author(s):  
Keishiro Yamashita ◽  
Kazuki Komatsu ◽  
Hiroyuki Kagi
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Crystal Growth ◽  
Single Crystal ◽  
Room Temperature ◽  
Growth Technique ◽  
Salt Hydrate ◽  
X Ray

An crystal-growth technique for single crystal x-ray structure analysis of high-pressure forms of hydrogen-bonded crystals is proposed. We used alcohol mixture (methanol: ethanol = 4:1 in volumetric ratio), which is a widely used pressure transmitting medium, inhibiting the nucleation and growth of unwanted crystals. In this paper, two kinds of single crystals which have not been obtained using a conventional experimental technique were obtained using this technique: ice VI at 1.99 GPa and MgCl<sub>2</sub>·7H<sub>2</sub>O at 2.50 GPa at room temperature. Here we first report the crystal structure of MgCl2·7H2O. This technique simultaneously meets the requirement of hydrostaticity for high-pressure experiments and has feasibility for further in-situ measurements.

Determination of Internal Stresses During Pearlite Transformation of 0.8c–1.5Mn Steel Through In-Situ Neutron Diffraction

2020 ◽  
Author(s):  
Satoshi Morooka ◽  
Nobuo Nakada ◽  
Yuhki Tsukada ◽  
Wu Gong ◽  
Takuro Kawasaki ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Internal Stresses

A Graphical Method for Storage Coefficient Determination from Quasi-Steady State Flow Data

1996 ◽  
Vol 27 (4) ◽  
pp. 247-254 ◽  
Author(s):  
Zekâi Şen
Keyword(s):  
Steady State ◽  
Graphical Method ◽  
Pumping Test ◽  
Quasi Steady State ◽  
Flow Data ◽  
Steady State Flow ◽  
Storage Coefficient ◽  
State Flow ◽  
Aquifer Test

A simple, approximate but practical graphical method is proposed for estimating the storage coefficient independently from the transmissivity value, provided that quasi-steady state flow data are available from a pumping test. In the past, quasi-steady state flow distance-drawdown data have been used for the determination of transmissivity only. The method is applicable to confined and leaky aquifers. The application of the method has been performed for various aquifer test data available in the groundwater literature. The results are within the practical limits of approximation compared with the unsteady state flow solutions.

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