We address the question of thermodynamics of regular cosmological spherically symmetric black holes with the de Sitter center. Space-time is asymptotically de Sitter as r → 0 and as r → ∞. A source term in the Einstein equations connects smoothly two de Sitter vacua with different values of cosmological constant: 8πGT μ ν = Λδ ν as r → 0, 8πGT μ ν = λδ μ ν as r → ∞ with λ < Λ. It represents an ...

The concept of 2-D row-column (RC) addressed arrays for 3-D imaging have shown to be an interesting alternative to 2-D matrix array, due to the reduced channel count. However, the properties for RC arrays to estimate blood velocities have never been reported, which is of great importance for a clinical implementation of this type of array. The aim of this study is, thus, to develop a technique ...

We present a first experimental demonstration of a new method to extract a wellcollimated beam of ultra-cold neutrons (UCN) from a storage vessel. Neutrons with too large divergence are not removed from the beam by an absorbing collimation, but a diffuse or semidiffuse channel with high Fermi potential reflects them back into the vessel. This avoids unnecessary losses and keeps the storage time...

Column strengthening is a very common practice for improving the seismic performance of reinforced concrete frame structures or repairing damage after event. Several methods are employed column strengthening, which can improve strength by preventing its shear, bending compression failure. However, not all allow connections between adjacent floors, thus beam-column joint could be limited column-...

Many RC frames built without seismic provisions between the ’50’s and ’70’s need structural upgrade in order to match the minimum requirements of new building codes. Generally, the critical region of the strengthening design is represented by the beam-column connection. The strength hierarchy governs the upgrade requiring to protect the column and the panel so that the formation of a plastic hi...

In order to explore the influence of length and width CFRP as well anchor spacing on reinforcement effectiveness plates concrete beams (RC beams) under secondary load, 7 anchored damaged FRP reinforced are used test beams, 1 unanchored beam is a control beam, structural indicators such ultimate load bending strength analyzed in result. The conclusion that composite plate can effectively prevent...

Currently, the seismic collapse risk of modern code-conforming reinforced concrete (RC) frame structures is often evaluated without considering behavior beam-column (BC) joints since designed to meet design codes are assumed be sufficiently rigid. BC in RC ductile moment frames may undergo a significant amount inclined cracking during strong earthquakes. Consequently, stiffness, strength, and d...

In this research, steel plate-fiber concrete composite jackets (SPFCJ) was used to strengthen the RC beams. The accuracy of analysis method evaluated by modeling beams fabricated in laboratory, and a good agreement observed. Variables finite element (FEM) include strength class main beam (15, 20, 25 MPa), length (1.4 2.8 m), type (RC jacket, SPFCJ, CFRP sheet), jacket thickness (40, 60 80 mm). ...