Chapter 10

The Review of Physical Chemistry of Japan, 1980

INTERPRETATION OF THE VOLUME Of ACTIVATION INORGANIC REACTIONS IN SOLUTION By Rudi \-an Eldik and Hartwig Kelm OP Contents: 1. 1 nt roduct ion 2. Volume quantities of chemical reactions in solution-Jefinitioos and determinations 3. Interpretation of the volume of activation 4. Volume of activation of inorganic reactions 4-1. Substitution reactions 4-?. Isomerization reactions 4-3. Redoz reactions 4-4. Phomchemical substitution reactions i. Concluding remarks of Physical Chemistry of Japan

Chemical Engineering Science, 1966

A single diffusion coefficient, D' applicable to steady-state processes in both equilibrium and non-equilibrium, multicomponent reacting systems is presented. This diffusion coefficient can be used to define the frozen Lewis number in its conventional form. An explicit expression for D' can be obtained in a multicomponent system only in the special case of a single-reaction, multicomponent system with identical binary diffusion coefficients. By analyzing an equilibrium reaction 2ABz z 2AB + Ba (of the type: 2NOa e 2N0 + 02 but with unequal diffusion coefficients) it is shown that D' is insensitive to the thermodynamic state of the system.

2019

Most developing countries have been faced problem of increasing tax revenue as they need to cover expenditure. Since Ethiopian is one part of developing country, pattern of tax revenues and economic growth across countries has become a significant concern to it. This study so investigated the determinants of tax revenue performance in Ethiopian federal government by using time series data from 1992-2013.The variable used were Foreign direct investment, public debt, openness ,foreign aid ,inflation and gross domestic product. The study has employed both descriptive and time series regression method as well as Eviews software for analysis purpose. Also post positivism research approach has been used. The trend of tax collection in Ethiopia is inconsistent, changing upward and downward depending upon economic conditions. However, in recent years it shows an incremental in total tax collection but performance of tax collection is decreasing from year to year. As an example, tax revenue was increased staring from 2003, because tax base was added as the form of VAT and also GDP was the main contributor since it has been rapidly increased. The study made diagnostic tests to assess the fitness of the model. The study reveals that growth domestic product, public debt foreign direct investment, and openness, have significant positive relationship with tax revenue performance. But, foreign aid is negatively related to tax revenue performance. The study also provides recommendations that will be solve this problem and added tax revenue performance. Policy implication has been stated in this study for example government should adjust its fiscal policy and investment area should be selected based on their benefit for country.

My attempt on solving structure analysis using cross method.

Procedia Structural Integrity, 2018

During their operation, modern aircraft engine components are subjected to increasingly demanding operating conditions, especially the high pressure turbine (HPT) blades. Such conditions cause these parts to undergo different types of time-dependent degradation, one of which is creep. A model using the finite element method (FEM) was developed, in order to be able to predict the creep behaviour of HPT blades. Flight data records (FDR) for a specific aircraft, provided by a commercial aviation company, were used to obtain thermal and mechanical data for three different flight cycles. In order to create the 3D model needed for the FEM analysis, a HPT blade scrap was scanned, and its chemical composition and material properties were obtained. The data that was gathered was fed into the FEM model and different simulations were run, first with a simplified 3D rectangular block shape, in order to better establish the model, and then with the real 3D mesh obtained from the blade scrap. The overall expected behaviour in terms of displacement was observed, in particular at the trailing edge of the blade. Therefore such a model can be useful in the goal of predicting turbine blade life, given a set of FDR data.