scholarly journals A Straight-Line Method for Analyzing Residual Drawdowns at an Observation Well

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Mesut Çimen
Keyword(s):  
Groundwater Resources ◽  
Dimensionless Time ◽  
Observation Well ◽  
Recovery Method ◽  
Straight Line ◽  
Well Function ◽  
And Storage ◽  
Straight Line Method

Determination of the hydraulic parameters (transmissivity and storage coefficients) of a confined aquifer is important for effective groundwater resources. For this purpose, the residual drawdowns have been in use to estimate the aquifer parameters by the classical Theis recovery method. The proposed method of this paper depends on a straight-line through the field data and it helps to calculate the parameters quickly without any need for long-term pumping data. It is based on the expansion series of the Theis well function by consideration of three terms, and this approach is valid for the dimensionless time factoru′=S′r2/4Tt′≤0.2. The method can be applied reliably to extensive and homogeneous confined aquifers resulting in different storage coefficients during the pumping and recovery periodsS≠S′. It presents a strength methodology for the parameters decision making from the residual data in the groundwater field of civil engineering.

The determination of the stoichiometry and stability constant of weak complexes in solution: a restatement of the "straight-line" method

1983 ◽  
Vol 61 (6) ◽  
pp. 1100-1102 ◽  
Author(s):  
Aurelio Beltrán-Porter ◽  
José A. Ramírez
Keyword(s):  
Stability Constant ◽  
Stoichiometric Ratio ◽  
Complex Species ◽  
Line Method ◽  
Straight Line ◽  
Weak Complexes ◽  
The Stability ◽  
Degree Of Condensation ◽  
Straight Line Method

Usually, to establish the degree of condensation of a complex species in solution, primarily when it is a weak complex, is more cumbersome than to determine the stoichiometric ratio itself. The present work describes a modification of the Asmus method in order to render it suitable for the determination of the actual stoichiometric coefficients and the stability constant of weak complexes whatever the degree of condensation may be.

scholarly journals QUESTIONS OF RECOGNITION AND DEPRECIATION OF OBJECTS OF ACCOUNTING IN THE FIELD OF LAND RELATIONS

2018 ◽  
Vol 8 (39) ◽  
pp. 35-49
Author(s):  
Alexander Petruk ◽  
Sergey Legenchuk ◽  
Tetyana Ostapchuk ◽  
Oksana Novak
Keyword(s):  
Production Method ◽  
Capital Expenditures ◽  
Residual Value ◽  
Line Method ◽  
Straight Line ◽  
Land Relations ◽  
The Right ◽  
Land Improvement ◽  
Straight Line Method

Recognition of criteria for all assets of an enterprise based on the study of normative and methodological documents were investigated and summarized in this article. The approaches to the criteria for recognition and depreciation of such objects of long-term assets as capital expenditures on land improvement and land use rights are explored. The depreciation charge for capital expenditures on land improvement should be carried out using the straight-line method, the method of reducing the residual value or cumulative, since the tax law does not use the method of accelerated reduction of residual value, and it is inappropriate to apply the production method of depreciation. Using the method of reducing the residual value or cumulative, will allow in the shortest possible time to accumulate depreciation deductions, keeping them from inflation depreciation. The straight-line method should be applied for the right to use a land plot because it is possible for use for the objects that were recognized as intangible assets. In accounting for monitoring the formation and use of depreciation deductions for reproduction of the above-mentioned objects of long-term assets, it is recommended for the calculation of the amounts to collect the required settlement information on accounts using the MS Excel table processor. The practical application of this table processor will simplify the calculation and promptness of providing information to investors, shareholders and others, and it will enable them to strategically approach the formation of depreciation policy of the enterprise.

scholarly journals Plasma L-[18F]6-Fluorodopa Input Function: A Simplified Method

1992 ◽  
Vol 12 (5) ◽  
pp. 881-884 ◽  
Author(s):  
Grace L.-Y. Chan ◽  
K. Scott Morrison ◽  
James E. Holden ◽  
Thomas J. Ruth
Keyword(s):  
Time Course ◽  
Input Function ◽  
Blood Analysis ◽  
Arterial Blood ◽  
Positron Emission ◽  
Straight Line ◽  
Simplified Method ◽  
Straight Line Method ◽  
Single Plasma

This article describes a simplified method for the determination of the l-[18F]6-fluorodopa (FDOPA) fraction time course that takes advantage of the strong correlation between the radioactivity ratio (metabolites/FDOPA) and time. Serial arterial blood samples are collected for assay of plasma total radioactivities following an intravenous injection of FDOPA into carbidopa-pretreated subjects. In addition, a single plasma sample, collected late in the study and analyzed for FDOPA fraction, is sufficient to determine accurately the time course of the FDOPA concentration in plasma. The validated straight-line method greatly simplifies blood analysis for routine positron emission tomography FDOPA studies.

scholarly journals Extraction-Atomic-Absorption Determination of Germanium with 2Hydroxy-5-T-Butylphenol-4-Methoxy-Azobenzene

2016 ◽  
Vol 12 (6) ◽  
pp. 4112-4116
Author(s):  
A.M. Pashajanov
Keyword(s):  
Atomic Absorption ◽  
Atomic Absorption Determination ◽  
Straight Line ◽  
Absorption Determination ◽  
Benzene Toluene ◽  
Complex Ratio ◽  
Light Absorbance ◽  
Ratio Of Components ◽  
Straight Line Method

The interaction of germanium with 2-hydroxy-5-T-butylphenol-4-methoxy-azobenzene (HR) was studied. Optimum values of pH of solution are 3.5÷4.0. Maximum light absorbance of the complex in n-butanol is in the range of 470÷480 nm. Chloroform, dichloroethane, carbon tetrachloride, benzene, toluene, xylene, hexane and n-butanol were tested for extraction of the complex. The most effective extractant was found to be n-butanol used in further studies. Absorption spectrum indicates the formation of one complex.  Ratio of components in the complex under optimum conditions were found by method of equilibrium shift and straight-line method of Asmus, they are equal to Ge:HR = 1:2. Selectivity of extraction-atomic absorption determination of germanium was studied by using HR. Molar absorption coefficient equals to (4.0±4.2)·104. Beer’s law was observed at concentrations of germanium 1÷10 mkg/ml. Stability constant of germanium in n-butanol was found to be βк=3.4·106. Calibration curve was linear at concentrations of germanium 1÷10 mkg/ml. Selective and sensitive techniques of extraction-atomic absorption determination of germanium in different regions were developed.

Unsteady Flow to a Non-Penetrating Well in Extensive Aquifers

1985 ◽  
Vol 16 (4) ◽  
pp. 213-220 ◽  
Author(s):  
Zekâi Şen
Keyword(s):  
Hydraulic Conductivity ◽  
Dimensionless Time ◽  
Confined Aquifer ◽  
Specific Storage ◽  
Type Curve ◽  
Type Curves ◽  
Basic Parameters ◽  
Matching Procedure ◽  
Well Function

The unsteady drawdown distribution around a non-penetrating well discharging from an extensively thick confined aquifer has been obtained. The solution is expressed in terms of dimensionless time factor and well function similar to the Theis method. However, the basic parameters are the hydraulic conductivity and specific storage coefficient. It is found that the type curves for non-penetrating wells is identical to the Theis type curve. Classical matching procedure leads to the determination of the specific storage and hydraulic conductivity coefficients.

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