Erratum for “Determination of c and φ from IDT and Unconfined Compression Testing and Numerical Analysis” by J. Piratheepan, C. T. Gnanendran, and A. Arulrajah

2013 ◽  
Vol 25 (3) ◽  
pp. 428-428
Author(s):  
J. Piratheepan ◽  
C. T. Gnanendran ◽  
A. Arulrajah
Keyword(s):  
Numerical Analysis ◽  
Compression Testing ◽  
Unconfined Compression

Acceptable Dislocation of Bearings of the Turbine Set Considering Permissible Vibration and Load of the Bearings

2005 ◽  
Vol 293-294 ◽  
pp. 433-440 ◽  
Author(s):  
Jozef Rybczynski
Keyword(s):  
Numerical Analysis ◽  
Vertical Direction ◽  
Large Power ◽  
Power Turbine ◽  
Bearing Load ◽  
Bearing Vibration

The paper presents the procedure and the results of determination of acceptable dislocation for particular bearings of the large power turbine set. The ranges have been evaluated by numerical analysis of the turbine set model. Acceptable dislocations of the bearings were calculated in horizontal and vertical direction separately in regard to criterion of permissible bearing vibration and in regard to permissible bearing load. The results have been presented graphically in the form of areas of acceptable dislocations, which allow the comparison considering both criteria. The paper contains exemplary trajectory graphs for all bearings corresponding to maximum acceptable dislocations. The investigations revealed asymmetry of areas of acceptable dislocations, which suggests that the constructional kinetostatic line of rotors is not optimal.

Numerical Analysis of Cavitation Inception and Desinence Behind Orifices

2020 ◽  
Vol 143 (3) ◽  
Author(s):  
E. L. Amromin
Keyword(s):  
Experimental Data ◽  
Numerical Analysis ◽  
Separated Flow ◽  
Computational Procedure ◽  
Cavitation Number ◽  
Laminar Flows ◽  
Cavity Pressure ◽  
Cavitation Inception ◽  
Separation Zones

Abstract Experimental results and trends for cavitation inception and desinence behind orifices in microchannels are quite different from the data obtained during previous experiments in much larger facilities. The objective of this paper is to explain these differences via a numerical analysis. The employed computational procedure is divided into two parts. The first part is computation of an axisymmetric separated flow around the orifice. The second part is determination of characteristics of cavities appearing within separation zones. The provided analysis of the experimental data of other researchers pointed out two sources of the above-mentioned differences. First, for larger orifices, the cavities appear in the cores of drifting vortices. For such a situation, cavitation inception and desinence number increases with the inflow speed due to an impact of turbulence, but there is no such an increase for microbubbles with laminar flows. Second, because of the difficulty to measure the cavity pressure in microbubbles, cavitation number is usually defined with employment of the vapor pressure, and this leads to misinterpretation of the measurements and their trends.

scholarly journals RUNNING MASS OF THE b-QUARK IN QCD AND SUSY QCD

2007 ◽  
Vol 22 (29) ◽  
pp. 5245-5277 ◽  
Author(s):  
A. V. BEDNYAKOV
Keyword(s):  
Numerical Analysis ◽  
Degrees Of Freedom ◽  
Effective Theory ◽  
Supersymmetric Extension ◽  
Heavy Particles ◽  
Advantages And Disadvantages ◽  
The Difference ◽  
B Quark

The running mass of the b-quark defined in [Formula: see text]-scheme is one of the important parameters of SUSY QCD. To find its value, it should be related to some known experimental input. In this paper, the b-quark running mass defined in nonsupersymmetric QCD is chosen for determination of the corresponding parameter in SUSY QCD. The relation between these two quantities is found by considering five-flavor QCD as an effective theory obtained from its supersymmetric extension. A numerical analysis of the calculated two-loop relation and its impact on the MSSM spectrum is discussed. Since for nonsupersymmetric models [Formula: see text]-scheme is more natural than [Formula: see text], we also propose a new procedure that allows one to calculate relations between [Formula: see text]- and [Formula: see text]-parameters. Unphysical ε-scalars that give rise to the difference between the above-mentioned schemes are assumed to be heavy and decoupled in the same way as physical degrees of freedom. By means of this method it is possible to "catch two rabbits," i.e. decouple heavy particles and turn from [Formula: see text] to [Formula: see text], at the same time. An explicit two-loop example of [Formula: see text] transition is given in the context of QCD. The advantages and disadvantages of the method are briefly discussed.

Program PKAS: a novel algorithm for the computation of successive protonation constants

1982 ◽  
Vol 60 (2) ◽  
pp. 168-173 ◽  
Author(s):  
Ramunas J. Motekaitis ◽  
Arthur E. Martell
Keyword(s):  
Numerical Analysis ◽  
Computer Program ◽  
Simultaneous Determination ◽  
Protonation Constants ◽  
Multidentate Ligands ◽  
Equilibrium Data ◽  
Unique Approach ◽  
Novel Algorithm

A new algorithm for the simultaneous determination of any number of protonation constants from potentiometric equilibrium data is described. This algorithm is characterized by a unique approach to the internal refinement of the constants and by the analytical nature of the numerical analysis whereby minimization is sought and achieved on the residuals between calculated and observed pH. The FORTRAN IV computer program PKAS utilizing this generalized algorithm has been written and developed and tested on 30 multidentate ligands. The details of the algorithm and the program are described and samples of its recorded usage are provided, indicating its versatility in application.

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