scholarly journals Sensitivity of the Groundwater Mound Model for Predicting Mire Topography

1987 ◽  
Vol 18 (4-5) ◽  
pp. 193-202 ◽  
Author(s):  
Pauline E. Kneale
Keyword(s):  
Hydraulic Conductivity ◽  
Limited Data ◽  
Average Value ◽  
Error Band ◽  
Order Of Magnitude ◽  
Equilibrium Profile ◽  
Using Data ◽  
Sensitive Parameters ◽  
Objective Determination

The Dupuit-Forcheimer model for groundwater mounds has been proposed to explain the morphology of raised peat mires. This paper discusses the sensitivity of the model as a predictor for mire profiles using data from a raised Irish mire where an attempt was made to reconstruct the equilibrium profile. The most sensitive parameters are shown to be hydraulic counductivity and net recharge. Detailed measurements of saturated hydraulic conductivity show significant spatial variability, which is correlated with mire stratigraphy. Objective determination of an average value for modelling would have an error band of an order of magnitude which is unsatisfactory for prediction. Net recharge is calculated from the water balance but parameters like overlandflow must be estimated, usually from limited data, making the proposed value suspect. This model may be helpful for mire description but its variables cannot be specified accurately enough for predictive purposes.

Validation of the framycetin sulfate determination technique by HPLC in a Framidex medicinal preparation

2020 ◽  
Vol 86 (6) ◽  
pp. 73-78
Author(s):  
D. D. Gapparov ◽  
Z. A. Smanova ◽  
Y. V. Timchenko ◽  
A. V. Pirogov
Keyword(s):  
Medicinal Preparation ◽  
Good Manufacturing Practice ◽  
Variation Coefficient ◽  
Intermediate Precision ◽  
Average Value ◽  
Limit Of Determination ◽  
Validation Criteria ◽  
Derivatizing Agent ◽  
Order Of Magnitude

A method for determination of framycetin sulfate in a Framidex preparation (eye and ear drops) by HPLC-UV (λ = 365 nm) using 2, 4-dinitrofluorobenzene as a derivatizing agent has been developed The characteristics of analytical methods determined for the purpose of their validation and relevant criteria for the validity of validated methods with the goal of the quality control of drugs (pharmaceutical substances and drugs) are presented. According to the results of an intralaboratory experiment on the validation assessment of the method by the parameters of the specificity, limit of determination (LOD), linearity, precision and laboratory accuracy, it is shown that the LOD decreases by an order of magnitude, the correlation coefficient is not less than 0.99 correctness (average value — 97.5 – 102.5%; variation coefficient — not more than 2.0%; the confidence range should include 100% of values), convergence (variation coefficient — not more than 1.5%), intermediate precision (variation coefficient — not more than 1.5%). It is shown that the obtained values of metrological characteristics do not exceed the validation criteria and the developed method matches all the well-known requirements of GMP (Good Manufacturing Practice).

Determination of Planck Mean Absorption Coefficients for HBr, HCl, and HF

2001 ◽  
Vol 124 (1) ◽  
pp. 26-29 ◽  
Author(s):  
S. P. Fuss ◽  
A. Hamins
Keyword(s):  
Absorption Coefficient ◽  
Narrow Band ◽  
Band Model ◽  
Absorption Coefficients ◽  
Temperature Range ◽  
Average Value ◽  
Integrated Intensity ◽  
Using Data ◽  
Narrow Band Model

The Planck mean absorption coefficient, ap, has been calculated for HBr, HCl, and HF over a temperature range from 300 K–2300 K using data from the 1996 edition of the HITRAN molecular database. Plots of ap versus temperature showed monotonically decreasing behavior over this temperature range, with peak values at 300 K of 45.9 (atm-m)−1, 5.3 (atm-m)−1, and 1.95 (atm-m)−1 for HF, HCl, and HBr, respectively. The magnitude of these values suggests that HBr, HCl, and HF can significantly impact calculations of radiative transfer in flames containing these species. Two sets of additional calculations were performed for CO to validate the methodology used for calculation of ap for HBr, HF, and HCl. In the first approach, which employed the narrow band model RADCAL, the calculation procedure was similar to that of the present calculations. The second approach utilized tabulated values of the integrated intensity for each CO band and an average value of the Planck function within each band. Results from the three methods showed general agreement. Polynomial expressions are provided as fits to ap as a function of temperature for HBr, HCl, HF, and CO.

scholarly journals DETERMINATION OF HYDRAULIC CONDUCTIVITY BY THE AUGER HOLE METHOD

2018 ◽  
Vol 3 (1) ◽  
pp. 91
Author(s):  
Oswaldo Palma Lopes Sobrinho ◽  
Stephanie Soares Arriero ◽  
Gerlange Soares da Silva ◽  
Aline Bezerra de Sousa ◽  
Álvaro Itaúna Schalcher Pereira
Keyword(s):  
Hydraulic Conductivity ◽  
Water Table ◽  
Main Parameter ◽  
Saturated Hydraulic Conductivity ◽  
Agricultural Drainage ◽  
Empirical Formulas ◽  
Drainage Systems ◽  
Average Value ◽  
Drainage Capacity

The hydraulic conductivity of a soil is the main parameter that determines its drainage capacity. However, its determination is of great importance for sizing in agricultural drainage systems. To determine the hydraulic conductivity of the soil in the presence of water table through the Auger-Hole. The experiment was carried out at Embrapa Manioc and Fruticulture (EMBRAPA), located in the municipality of Cruz das Almas-BA. In order to estimate the hydraulic conductivity, several empirical formulas have been proposed, such as Ernst's, which is the model that most closely approximates the soil situation studied. The hydraulic conductivity values for the studied soil obtained by the Auger-Hole method ranged from 0.24821 to 0.28544 m day-1. With an average value for hydraulic conductivity of 0.266835 m day-¹, being considered slow. The soil under analysis is classified in slow saturated hydraulic conductivity. The Auger-Hole method proved to be practical, fast, safe and easy to handle.

scholarly journals RESEARCH OF PHYSIOMETRIC INDICATORS OF FEMALE STUDENTS FROM TRAKIA UNIVERSITY

2020 ◽  
Vol 18 (Suppl.1) ◽  
pp. 695-698
Author(s):  
P. Angelova ◽  
P. Petkov
Keyword(s):  
Motor Skills ◽  
Vital Capacity ◽  
Female Students ◽  
The Body ◽  
Average Value ◽  
Right Hand ◽  
Hand Dynamometer ◽  
Left And Right ◽  
Objective Determination

Reliable data on physical fitness and determination of the functional state of the body reflect the level of physical capabilities and the level of development of motor skills. Objective: Determination of individual physiometric indicators in students. Contingent: 130 female students of Trakia University. The average value of the vital capacity in the studied students is 3, 60, and vital indicator 61,61. With the left and right hand dynamometer, mean right hand values ​​of 15,46 kg were found, and left - 12,76 kg. Force strength is set at 63,42kg. Conclusion: The relative share of students with low values ​​of the vital capacity is high, the values ​​for dynamometry force are also low; there is a disproportion between good physical development due to acceleration factors and recorded retention or deterioration of physical capacity.

Estimation of Q in eastern Canada using coda waves

1990 ◽  
Vol 80 (2) ◽  
pp. 411-429
Author(s):  
Catherine R. D. Woodgold
Keyword(s):  
The United States ◽  
Single Scattering ◽  
Adirondack Mountains ◽  
Large Area ◽  
Eastern Canada ◽  
Average Value ◽  
Seismic Coda ◽  
Geographical Regions ◽  
Using Data

Abstract The determination of Q0 and η (where Q = Q0fη) from seismic coda over the United States by Singh and Herrmann (1983) has been extended to cover a large area of southeastern Canada (south of 50°N, east of 80°W). The model used assumes, like that of Singh and Herrmann (1983), that the coda is generated by isotropic single scattering of surface waves, but also takes into account nonzero source-receiver distances. An average value of 0.43 is found for η for the whole region. Assuming this value of η, and using data in the 1 to 10 Hz range, Q0 has been estimated independently in nine different subregions, so that the variation of Q0 within the area of study can be seen. Q0 varies from 480 in New Brunswick to 770 near Ottawa. Q0 is also high (760) in the Adirondack Mountains and near Val-d'Or, Quebec (730), but lower along the St. Lawrence River (620). The results agree well with those of other studies in which Q for the same geographical regions is determined by other methods. Above 10 Hz and below 1 Hz, Q is more strongly dependent on frequency than in the 1 to 10 Hz range. The same result has been obtained by Shin and Herrmann (1987) by a different method.

Determination of Myocardial FFA Elimination Rates by Functional Images of Uncorrected Half-Time Values

1984 ◽  
Vol 23 (06) ◽  
pp. 277-282 ◽  
Author(s):  
A. Van Lingen ◽  
G. Westera ◽  
M. van ◽  
W. Den Hollander ◽  
E. E. Van der Wall ◽  
...  
Keyword(s):  
Coronary Artery ◽  
Regions Of Interest ◽  
Heptadecanoic Acid ◽  
Half Time ◽  
Alternative Method ◽  
Functional Images ◽  
Functional Image ◽  
Back Ground ◽  
Objective Determination

SummaryThis paper presents an alternative method of demarcating regions of in terest over the myocardium after ad ministration of 123I-heptadecanoic acid to patients with coronary artery disea se. In a matrix of 32 × 32 pixels the elimination rates of the radioactivity, which are not corrected for back ground activity, are visualized per pixel in a functional image. The func tional image showed areas in the myocardium with high values of uncorrected elimination rates. These areas corresponded with the tracer defects on the scintigram. Corrected elimination rates obtained from re gions of interest of functional images were comparable with those of scinti grams. Thus based on functional im ages of uncorrected elimination rates a reliable, objective determination of regions of interest over normal and abnormal myocardium can be made.

Development of a method for multielemental determination in water by EDXRF with radioisotopic source of 238Pu.

2019 ◽  
Vol 7 (2A) ◽  
Author(s):  
Camilo Fuentes Serrano ◽  
Juan Reinaldo Estevez Alvares ◽  
Alfredo Montero Alvarez ◽  
Ivan Pupo Gonzales ◽  
Zahily Herrero Fernandez ◽  
...  
Keyword(s):  
Thin Layer ◽  
Expanded Uncertainty ◽  
Considerable Decrease ◽  
X Ray ◽  
Precipitation Efficiency ◽  
Method Of Determination ◽  
Sensitivity Curves ◽  
Order Of Magnitude ◽  
Metrological Parameters

A method for determination of Cr, Fe, Co, Ni, Cu, Zn, Hg and Pb in waters by Energy Dispersive X Ray Fluorescence (EDXRF) was implemented, using a radioisotopic source of 238Pu. For previous concentration was employed a procedure including a coprecipitation step with ammonium pyrrolidinedithiocarbamate (APDC) as quelant agent, the separation of the phases by filtration, the measurement of filter by EDXRF and quantification by a thin layer absolute method. Sensitivity curves for K and L lines were obtained respectively. The sensitivity for most elements was greater by an order of magnitude in the case of measurement with a source of 238Pu instead of 109Cd, which means a considerable decrease in measurement times. The influence of the concentration in the precipitation efficiency was evaluated for each element. In all cases the recoveries are close to 100%, for this reason it can be affirmed that the method of determination of the studied elements is quantitative. Metrological parameters of the method such as trueness, precision, detection limit and uncertainty were calculated. A procedure to calculate the uncertainty of the method was elaborated; the most significant source of uncertainty for the thin layer EDXRF method is associated with the determination of instrumental sensitivities. The error associated with the determination, expressed as expanded uncertainty (in %), varied from 15.4% for low element concentrations (2.5-5 μg/L) to 5.4% for the higher concentration range (20-25 μg/L).

Efficacy of CO2 laser for the objective determination of caries

1986 ◽  
Author(s):  
Marcus D. Benedetto ◽  
Donald E. Antonson ◽  
Lawrence M. Elson ◽  
Londa D. Reid-Sanders ◽  
Jacquelyn I. Williams
Keyword(s):  
Co2 Laser ◽  
Objective Determination

Diagnostics of metal samples using the results of experimental and theoretical study of positively charged microparticles formed upon sample destruction

2018 ◽  
Vol 84 (10) ◽  
pp. 23-28
Author(s):  
D. A. Golentsov ◽  
A. G. Gulin ◽  
Vladimir A. Likhter ◽  
K. E. Ulybyshev
Keyword(s):  
Experimental Data ◽  
Early Stage ◽  
Experimental Studies ◽  
Material Model ◽  
Total Charge ◽  
Cross Sectional ◽  
Practical Applications ◽  
Mechanical And Electrical Properties ◽  
Order Of Magnitude ◽  
Using Data

Destruction of bodies is accompanied by formation of both large and microscopic fragments. Numerous experiments on the rupture of different samples show that those fragments carry a positive electric charge. his phenomenon is of interest from the viewpoint of its potential application to contactless diagnostics of the early stage of destruction of the elements in various technical devices. However, the lack of understanding the nature of this phenomenon restricts the possibility of its practical applications. Experimental studies were carried out using an apparatus that allowed direct measurements of the total charge of the microparticles formed upon sample rupture and determination of their size and quantity. The results of rupture tests of duralumin and electrical steel showed that the size of microparticles is several tens of microns, the particle charge per particle is on the order of 10–14 C, and their amount can be estimated as the ratio of the cross-sectional area of the sample at the point of discontinuity to the square of the microparticle size. A model of charge formation on the microparticles is developed proceeding from the experimental data and current concept of the electron gas in metals. The model makes it possible to determine the charge of the microparticle using data on the particle size and mechanical and electrical properties of the material. Model estimates of the total charge of particles show order-of-magnitude agreement with the experimental data.

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