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Abstract

This work aims to highlight gravity segmental retaining walls with their varied advantages. The paper investigates the dynamic behavior analysis of segmental retaining walls. The stability analysis is conducted on the basis of a pseudo-static Mononobe-Okabe theory that provides safety factors against sliding and overturning failure. The results demonstrate that the crucial safety factor of internal stability is the safety factor against overturning. Moreover, the positive wall inclination angle contributes to an improvement in the stability of the segmental retaining walls and the effect of the vertical seismic coefficient on the stability can be disregarding. Finally, a new equation is proposed for the elementary design of the segmental retaining walls.

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Abstract  

Mössbauer measurements were performed at different temperatures in order to examine the dynamic behavior of iron in the glass system: 42.5% P2O5, 42.5% Na2O, 15% Fe2O3. Variation of the dynamic behavior was traced by substituting B2O3 for P2O5 [30 P2O5, 12.5 B2O3, 42.5 Na2O, 15 Fe2O3] and by increasing the amount of iron at the expense of Na2O [42.5 P2O3, 15 Na2O, 42.5 Fe2O3]. The Mössbauer measurements gave the values of Debye temperature ( D), mean square displacement < 2>, mean square velocity <v 2 > of oscillation, the lattice time () and the strength parameter (B) for each glass. These values were discussed with the results of DTA, density, hardness and D. C. conductivity.

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they concluded that the effectiveness of separation systems for tanks increases, due to the increase in system flexibility enhancement. Livaoglu [ 3 ] have studied the dynamic behavior of the rectangular liquid reservoir and they claimed that the

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of 40 kPa was used to evaluate the ability of the material models to predict the dynamic behavior of the soil. An irregular load history was scaled to obtain a maximum value of shear stress of 40 kPa for this stress-controlled TOSS test, and the

Open access
Pollack Periodica
Authors:
Hasnae Boubel
,
Oumnia Elmrabet
,
Elmehdi Echebba
, and
Mohamed Rougui

propagates from the base of the mass, which dampens the transmission of power to the floor and to the superstructure. The three-dimensional analysis of the dynamic behavior of the structure of the soil-foundation machine showed that the dynamic reaction of

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presented developed with the Markov-chain approach using the same dataset. Finally, the two approaches are being compared based on the root mean square error and the Speed-Acceleration Probability Distribution (SAPD), which precisely reflects the dynamic

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The glass transition temperatures of sorbitol and fructose were characterized by four points determined on DSC heating thermograms (onset, mid-point, peak and end-point), plus the limit fictive temperature. The variations of these temperature values, observed as functions of cooling and heating rates, were used to determine the fragility parameter, as defined by Angell [1] to characterize the temperature dependence of the dynamic behavior of glass-forming liquids in the temperature range above the glass transition.

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Abstract  

The conservation equations for particulate systems were utilized to investigate the fluid-dynamic behavior of a gas-solid mixture flowing along a vertical tube (riser) in a simplified model of a pilot catalytic cracking unit. Nuclear techniques were utilized for the determination of the flow parameters along the riser. The results show a satisfactory agreement between the theoretical data and those obtained by experimental tests.

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The rubbing, as an undesired non-linear dynamical behavior of rotors, is a widely studied topic in the field of rotor-dynamics. Standard models usually use the classic Jeffcott rotor system with several rolling and journal (bearings without rolling elements, usually filled with oil) bearings, or with magnetic ones. The present paper investigates a model that takes into consideration also the gyroscopic effect and its influence on the rubbing phenomenon.

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Based on a nonlinear model, this article realizes an investigation of dynamic behaviour of a batch fermentation process using direct sensitivity analysis (DSA). The used nonlinear mathematical model has a good qualitative and quantitative description of the alcoholic fermentation process. This model has been discussed and validated by authors in other studies. The DSA of dynamic model was used to calculate the matrix of the sensitivity functions in order to determine the influence of the small deviations of initial state, control inputs, and parameters from the ideal nominal values on the state trajectory and system output in time. Process optimization and advanced control strategies can be developed based on this work.

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