The penetration parameter λ of the anomalousM1-conversion of the 482 keV transition in181Ta

1977 ◽  
Vol 282 (1) ◽  
pp. 39-48 ◽  
Author(s):  
K. Freitag ◽  
K. Krien ◽  
J. C. Soares ◽  
P. Herzog ◽  
W. D. Schneider ◽  
...  
Keyword(s):  
Penetration Parameter

Penetration Parameter for an Adsorbed Layer of Polarizable Ions

1966 ◽  
Vol 37 (9) ◽  
pp. 3471-3482 ◽  
Author(s):  
J. Ross MacDonald ◽  
C. A. Barlow
Keyword(s):  
Adsorbed Layer ◽  
Penetration Parameter

scholarly journals The K-conversion Coefficient of the Retarded 482 keV Transition in 181Ta

1973 ◽  
Vol 28 (12) ◽  
pp. 1954-1958
Author(s):  
M. S. El-Nesr ◽  
E. Bashandy
Keyword(s):  
Internal Conversion ◽  
Conversion Coefficient ◽  
Finite Size ◽  
Conversion Process ◽  
Coincidence Method ◽  
Penetration Parameter

The K-conversion coefficient of the 482 keV transition in 181Ta has been measured by means of an electron-electron coincidence method. The result obtained is αK = 0.0240 ± 0.0012. It is noticed that the Ml conversion process of the 482 keV transition is strongly affected by the penetration terms. The Ml conversion coefficient is about 10 times larger than the normal finite size corrected value.The internal conversion penetration parameter λ, is found to be: λ = 175 ± 8 in accordance with what is expected on theoretical grounds.

Straightforward inversion of MT data using a normalized impedance function

Geophysics ◽  
2007 ◽  
Vol 72 (1) ◽  
pp. F19-F24 ◽  
Author(s):  
Sri Niwas ◽  
P. K. Gupta ◽  
V. K. Gaur
Keyword(s):  
Power Series ◽  
Layer Thickness ◽  
Recurrence Relation ◽  
Response Function ◽  
Linear Problem ◽  
Data Sets ◽  
Impedance Function ◽  
Data Inversion ◽  
Impedance Response ◽  
Penetration Parameter

We present a new algorithm for 1D magnetotelluric (MT) data inversion. It inverts a normalized impedance response function derived from the classical Cagniard impedance function. The scheme transforms the nonlinear problem of estimating layer resistivities and thicknesses into a linear problem of estimating the coefficients of power series of the new response function. This is achieved by working with a model where each layer has a thickness of constant penetration. The first coefficient of the series provides top-layer resistivity, which, in conjunction with the constant penetration parameter, then provides the layer thickness. The scheme employs a recurrence relation developed between the coefficients of the power series of two successive layers. This relation is used to continue downward and estimate the remaining layer resistivities and thicknesses. The scheme has been tested on a synthetic model and on three well-studied data sets relating to deep, intermediate, and shallow exploration.

scholarly journals Research on building the formula to determine the rate of penetration for polycrystalline diamond compact bits

2021 ◽  
Vol 62 (3a) ◽  
pp. 57-64
Author(s):  
Tu Van Truong ◽  
Hung Tien Nguyen ◽  
Duong Hong Vu ◽  
Keyword(s):  
Impact Force ◽  
Polycrystalline Diamond ◽  
Oil Field ◽  
Force Model ◽  
Rock Destruction ◽  
Rate Of Penetration ◽  
Pdc Bit ◽  
Polycrystalline Diamond Compact ◽  
The Impact ◽  
Penetration Parameter

Nowadays, polycrystalline diamond compact (PDC) drill bits are widely used in the oil and gas industry when drilling in soft rocks. However, parameters used for the PDC bit are usually based on the instructions of the drill manufacturer with a very wide adjustment range. Therefore, it is necessary to have a specific formula in order to determine the rate of penetration parameter (ROP) for the PDC bit in evaluating the influence of the parameters, rock mechanical properties and other parameters on the rate of penetration parameter (ROP). From there, it gives reasonable parameters and improves the design of the PDC bit to improve drilling efficiency. The article applies theoretical analysis method and Dalamber's principle to illuminate and build up the impact force model for PDC bits in the rock destruction process. From the impact force model, a formula to determine ROP for PDC bits was proposed. Finally, the authors applied the research results to the actual data obtained from the Nam Rong - Doi Moi oil field. The formula for determining the rate of penetration parameter (ROP) for the PDC bit that the authors have built has high accuracy and can be applied to many different rock.

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