Influence Of Geometric Factors Research Articles

The influence of geometric factors on crack depth measurement using the potential drop technique

The electric potential (potential drop or potential difference) technique is used for the measurement of crack depth in metallic components. The geometric shape of the sample must be considered in order to minimize the error. A three-dimensional finite element method is also used to calculate the electric field. The accuracy is shown to be satisfactory by comparing the calculations with the experimental results. From the results of the computation, the influence of the geometric factors is discussed in detail.

The influence of geometric factors on crack depth measurement using the potential drop technique

The influence of geometric factors on crack depth measurement using the potential drop technique

An investigation of the electronic factors that influence structural differences between cis-(CpMoCl) 2(μ,η 4-Ar 4C 4) (Ar = p-tolyl or phenyl) and trans-(CpNbCO) 2(Ph 2C 2) 2

The influence of geometric factors, such as cis/trans isomerism, and electronic factors, such as π donor vs π acceptor ligands and coupled and uncoupled acetylene ligands, on the stability of cis-(CpMoCl) 2(μ,η 4-Ar 4C 4) and trans-(CpNbCO) 2(Ph 2C 2) 2 is investigated through patterns in molecular orbital diagrams, size of HOMO/LUMO gap and total energies. The comparison between the two dimers involves rationalization of why the observed structures appear so different, when in fact both clusters have the same number of valence electrons. In the course of the investigation, other stable niobium chlorine complexes are discussed and the kinetic vs thermodynamic stability of trans-(CpNbCO) 2 (Ph 2C 2) 2 is analysed.

About the Influence of Geometrical Factors on Liquid Crystalline Properties—The Methylene Group as a Central Spacer Unit

Abstract The preparation and liquid crystalline properties of four classes of substance with a central methylene spacer unit are described. As a result of our investigations, it is shown that a “one-atomic” central spacer, such as a methylene group, combined with a 1,4-cyclohexylene ring, contributes to the stabilization of the liquid crystalline state in the same way as a—(CH2)5—moiety. Compounds with this new “crooked” central spacer of course exhibit lower clearing temperatures than compounds with ethylene (CH2CH2) spacers etc., but they demonstrate a new quality in relation to the influence of geometrical factors on liquid crystalline properties.

The influence of geometrical factors and feedstock on gasification in a high temperature fluidised bed

AbstractResults are presented for gasification of coal and char by means of air or air‐steam mixtures in fluidised bed reactors of three different volumes. Two sizes of coal feedstock particles, 0.5‐1.0 mm and 1.0‐1.5 mm, and one size of char particles, 0.5‐1.5 mm, were used. The calorific value of generated gas and the carbon conversion are presented as a function of particle residence time. For coal gasification higher carbon conversion has been obtained at the same particle residence time than for char gasification. For the steam gasification, a lower gas heating value of about 4 MJ/m3 (S.T.P.) was obtained.

Supersonic flow over a sphere in the wake of a blunt cylinder

The authors use numerical solutions of the Navier-Stokes equations to investigate the influence of geometric factors on the flow structure ahead of a sphere and the surface distributions of pressure and heat transfer.

Shell-side heat transfer coefficients in cylindrical heat exchangers. The influence of geometrical factors. I - the non-leakage case

A mass transfer analogue technique has been used to obtain heat transfer coefficients for an individual baffle compartment in a small cylindrical heat exchanger model, for two baffle spacings and three baffle cuts under non-leakage conditions. Various forms of correlation were applied to the data and found to be inadequate. Development of any improved correlation will require further experimental work.

The influence of geometrical factors in 131I-Hippuran renography

Using a particular collimated NaI scintillation detector and a kidney phantom containing 131I, the dependence of the resulting count rates on collimator-kidney geometry has been determined. These results have been used to calculate the geometrical contribution to the error in the measurement of relative effective renal plasma flow (RFP) by 131I-Hippuran renography. Combination of this error with that from natural movement and statistical fluctuations, as observed using a dose of 10 mu Ci 131I-Hippuran, has led to the estimation of a corresponding potential error of 11%. Values of the potential error which is defined as the 99% probability range, have been calculated covering the range of RFP.

Der einfluss geometrischer faktoren auf probleme der messung in strahlungsfeldern

The influence of geometric factors on problems in the measurement of radiation fields is considered. Field sources and probes are often assumed to be point-shaped in problems of field physics. The probes correspond to certain measurable quantities. In many situations in which field source or/and probe (test object) are not point-shaped, we may assume that deviation of the measurements from the idealized case mentioned above depends exclusively upon geometric factors. In this paper approximate solutions are discussed and explicitly presented for several geometric configurations under said assumption.

On the energy and pulse spectra of a fast ionization chamber

An analytical investigation is carried out on the influence of geometrical factors of a pulse ionization chamber on the correspondence between energy and pulse spectra. General formulas are given for plane, cylindrical and spherical chambers. The method is suitable to be handled in practical cases and examples are given.