Determination of the coefficients of linear expansion of fiberglas by the unsteady-state method

1967 ◽  
Vol 13 (1) ◽  
pp. 22-25
Author(s):  
N. N. Medvedev
Keyword(s):  
Linear Expansion ◽  
Unsteady State ◽  
State Method

scholarly journals Determination of physical and thermophysical characteristics of red peppers (Capsicum annum) using unsteady-state method

2018 ◽  
Author(s):  
Siti Asmaniyah Mardiyani ◽  
Soemardi Hadi Sumarlan ◽  
Bambang Dwi Argo ◽  
Amin Setyo Laksono
Keyword(s):  
Unsteady State ◽  
Thermophysical Characteristics ◽  
Capsicum Annum ◽  
State Method ◽  
Red Peppers

An unsteady state method for measuring the permeability of small tubular membranes

AIChE Journal ◽  
1975 ◽  
Vol 21 (6) ◽  
pp. 1192-1199 ◽  
Author(s):  
James F. Stevenson ◽  
Michael A. Von Deak ◽  
Mark Weinberg ◽  
R. Wade Schuette
Keyword(s):  
Unsteady State ◽  
State Method ◽  
Tubular Membranes

Determination of effective oxygen diffusivity in biofilms grown in a completely mixed biodrum reactor

1994 ◽  
Vol 29 (10-11) ◽  
pp. 455-462 ◽  
Author(s):  
Y.-C. Fu ◽  
T. C. Zhang ◽  
P. L. Bishop
Keyword(s):  
Finite Difference ◽  
Finite Difference Method ◽  
Unsteady State ◽  
The Past ◽  
Oxygen Diffusivity ◽  
Oxygen Microelectrodes ◽  
State Variation ◽  
Explicit Finite Difference ◽  
Explicit Finite Difference Method

Direct measurement of unsteady-state variation of oxygen concentrations inside deactivated biofilm at intervals of 100 μm was conducted with oxygen microelectrodes. The diffusivity of each layer was estimated using an explicit finite-difference method. The results show that the distribution of the biofilm effective oxygen diffusivity varies from 25% Dw at the substratum of the biofilm to 90% Dw at the surface of the biofilm. This information provides experimental evidence necessary for biofilm modelling that could not be approached in the past, and will create a new dimension for evaluation of biofilm processes.

scholarly journals Assessment of enclosing structure moisture regime using moisture potential theory

2018 ◽  
Vol 193 ◽  
pp. 03053 ◽  
Author(s):  
Vladimir Gagarin ◽  
Vadim Akhmetov ◽  
Kirill Zubarev
Keyword(s):  
Mathematical Models ◽  
Potential Theory ◽  
Single Layer ◽  
Moisture Distribution ◽  
Moisture Regime ◽  
Continuous Control ◽  
Unsteady State ◽  
Steady State Method ◽  
State Method ◽  
Moisture Potential

The paper describes principal development directions of mathematical models of enclosing structure moisture regime. Benefits of mathematical models based on moisture potential theory are demonstrated. Moisture regime calculation by means of moisture potential, taking liquid and vapor moisture transfer into consideration, and using discrete-continual approach is proposed. New formulas for single-layer and multi-layer enclosing structures allowing for numerical analytic determination of moisture potential value in any enclosing structure section, at any moment of time, under continuous control of temperature distribution, have been derived. Moisture distribution has been studied for a number of enclosing structures using different methods of moisture potential theory: unsteady-state method, quasi-stationary method, the proposed discrete-continual method. Moisture regime has been determined for single-layer enclosing structure with ceramic brick basement and lime brick cladding in Moscow. It is shown that the greatest moisture value is achieved in enclosing structure calculation by means of steady-state method. Unsteady-state method gives more accurate moisture distribution. The proposed discrete-continual method gives quantitative and qualitative result of moisture distribution similar to results obtained by unsteady-state method. The benefit of discrete-continual method is a distribution obtained analytically, which allows to use solution results without numerical method application.

Sign in / Sign up

Export Citation Format

Share Document