Experimental and theoretical studies of bearing capacity and deformation of reinforced soil foundations under cyclic loading

2014 ◽  
pp. 737-742 ◽  
Author(s):  
Ilizar Mirsayapov ◽  
Irina Koroleva
Keyword(s):  
Cyclic Loading ◽  
Bearing Capacity ◽  
Reinforced Soil ◽  
Theoretical Studies ◽  
Experimental And Theoretical Studies

scholarly journals To the issue of monitoring of metal-bearing bridges supporting fiber optic sensors

2018 ◽  
Vol 5 (3) ◽  
Author(s):  
Mikhail Fedotov ◽  
Maxim Loskutov ◽  
Ivan Shelemba ◽  
Alexey Kolesnikov ◽  
Igor Ovchinnikov
Keyword(s):  
Composite Materials ◽  
Bearing Capacity ◽  
Fiber Optic ◽  
Experimental Studies ◽  
Fiber Bragg Gratings ◽  
Fiber Optic Sensors ◽  
Theoretical Studies ◽  
Metal Structures ◽  
Before And After ◽  
Experimental And Theoretical Studies

This article describes results of studies on the monitoring of deformations of load-bearing metal structures of a span structure of a bridge using fiber-optic sensors based on fiber Bragg gratings before and after reinforcement by polymer composite materials. It is received, that as a result of strengthening the deflection of the bridge has decreased in 2 times. The results of the experimental studies were compared with the computational justification carried out in PC LIRA 10.8. As a result of experimental and theoretical studies it was confirmed that the installed reinforcement system using composite spigots can be effectively used to restore the bearing capacity of artificial structures.

The Stabilizing Effect of Pre-Equilibria: A Trifluoromethyl Complex as CF2 Reservoir in Catalytic Olefin Difluorocarbenation

2020 ◽  
Author(s):  
Thomas Louis-Goff ◽  
Huu Vinh Trinh ◽  
Eileen Chen ◽  
Arnold L. Rheingold ◽  
Christian Ehm ◽  
...  
Keyword(s):  
High Selectivity ◽  
Side Reactions ◽  
Theoretical Studies ◽  
Attractive Feature ◽  
Catalyst Recovery ◽  
Wide Range ◽  
Stabilizing Effect ◽  
Experimental And Theoretical Studies

A new, efficient, catalytic difluorocarbenation of olefins to give 1,1-difluorocyclopropanes is presented. The catalyst, an organobismuth complex, uses TMSCF<sub>3</sub> as a stoichiometric difluorocarbene source. We demonstrate both the viability and robustness of this reaction over a wide range of alkenes and alkynes, including electron-poor alkenes, to generate the corresponding 1,1-difluorocyclopropanes and 1,1-difluorocyclopropenes. Ease of catalyst recovery from the reaction mixture is another attractive feature of this method. In depth experimental and theoretical studies showed that the key difluorocarbene-generating step proceeds through a bismuth non-redox synchronous mechanism generating a highly reactive free CF<sub>2</sub> in an endergonic pre-equilibrium. It is the reversibility when generating the difluorocarbene that accounts for the high selectivity, while minimizing CF<sub>2</sub>-recombination side-reactions.

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