The aggregate modulus and hydraulic permeability of compressed bovine nucleus pulposus tissue under single-step and multiple-step loading conditions

2003 ◽

Vol 5 (3) ◽

pp. 363 ◽

Cited By ~ 1

Author(s):

Slamet Sugiri

Keyword(s):

Linear Regression ◽

Regression Models ◽

Stock Exchange ◽

Manufacturing Firms ◽

Single Step ◽

Model Parameters ◽

Linear Regression Models ◽

Operating Income ◽

Predictive Content ◽

Multiple Step

The main objective of this study is to examine a hypothesis that the predictive content of normal income disaggregated into operating income and nonoperating income outperforms that of aggregated normal income in predicting future cash flow. To test the hypothesis, linear regression models are developed. The model parameters are estimated based on fifty-five manufacturing firms listed in the Jakarta Stock Exchange (JSX) up to the end of 1997.This study finds that empirical evidence supports the hypothesis. This evidence supports arguments that, in reporting income from continuing operations, multiple-step approach is preferred to single-step one.

Download Full-text

The effect of decationation of hydroxylated HNaY zeolites on their interaction with ethylene and propylene. hydrogen complexes, oligomeration and isotope exchange

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19803101 ◽

1980 ◽

Vol 45 (11) ◽

pp. 3101-3115 ◽

Cited By ~ 10

Author(s):

Ludmila Kubelková ◽

Jana Nováková ◽

Zdeněk Dolejšek ◽

Pavel Jírů

Keyword(s):

Isotope Exchange ◽

Decisive Role ◽

Single Step ◽

Hydroxyl Groups ◽

Isotope Exchange Reaction ◽

Factors Affecting ◽

Step Mechanism ◽

Formed Hydrogen ◽

Lower Basicity ◽

Multiple Step

The effect of decationation on the interaction of propylene and ethylene with the hydroxylated forms of HNaY zeolites has been studied. The compounds formed in the zeolite cavities were studied using their infrared spectra, the composition of the gaseous phase was followed by mass spectrometry. The results showed that among factors affecting the interaction with propylene properties of hydroxyl groups play the decisive role. With the increasing decationation of the zeolite the strength of the OH bond in the hydrogen complex of the large-cavity hydroxyls with propylene decreased and the rate of propylene oligomeration at 310 K as well as the isotope exchange rate of propylene-d6 with the zeolite hydroxyls at 570 K increased. The propylene isotope exchange reaction proceeded by the multiple-step mechanism. In the case of ethylene only the physical sorption with a non-specific character was observed at 310 K. The adsorbed amount increased with the increasing content of Na+ ions in the zeolite (with the decreasing decationation). A part of the adsorbed molecules formed hydrogen complexes with hydroxyls of large cavities. The observed lower weakening of the OH bond was in agreement with the lower basicity of ethylene if compared with propylene. The isotope exchange of ethylene-d4 with the zeolite hydroxyls proceeded by a single-step mechanism, it had an autocatalytic character and its rate was 70 times lower than that of the isotope exchange of propylene-d6 with OH.

Download Full-text