6,891 research outputs found
Phase diagram of asymmetric Fermi gas across Feshbach resonance
We study the phase diagram of the dilute two-component Fermi gas at zero
temperature as a function of the polarization and coupling strength. We map out
the detailed phase separations between superfluid and normal states near the
Feshbach resonance. We show that there are three different coexistence of
superfluid and normal phases corresponding to phase separated states between:
(I) the partially polarized superfluid and the fully polarized normal phases,
(II) the unpolarized superfluid and the fully polarized normal phases and (III)
the unpolarized superfluid and the partially polarized normal phases from
strong-coupling BEC side to weak-coupling BCS side. For pairing between two
species, we found this phase separation regime gets wider and moves toward the
BEC side for the majority species are heavier but shifts to BCS side and
becomes narrow if they are lighter.Comment: 4 pages, 3 figures. Submitted to LT25 on June 200
Fracture Energy Measurement in Different Concrete Grades
Fracture energy is regarded as an intrinsic (material) property to dominate crack mechanisms and associated crack growth to concrete damage under applied stress. More recently, huge evolution in computing technology leading to finite element analysis (FEA) approaches to require incorporation of constitutive model, such as traction-separation relationship derived from state-of-the-art fracture mechanics fundamental. A physically-based models requires fracture energy values; therefore, properly measured fracture energy value is essential to exhibit better structures response within FEA models. Large arrays of parameters involved during concrete mixture such as beam size effect, aggregate size and concrete grade to affect the flexural resistance in concrete. The fracture and failure in concrete ahead of crack tip is represented by fracture energy values where micro-damage events occurred such as interfacial failure, fiber-bridging and matrix cracking. This study aims to investigate the fracture energy of concrete specimens with combination of notch depth ao at mid-span, design concrete strength as specified in the testing series. Independent compression strength, fc and measured load-displacement profiles under three-points bending test were used to determine fracture energy by incorporating three available fracture energy expressions such as Bazant, Hillerborg and CEB-FIP models
Fracture Energy Measurement in Different Concrete Grades
Fracture energy is regarded as an intrinsic (material) property to dominate crack mechanisms and associated crack growth to concrete damage under applied stress. More recently, huge evolution in computing technology leading to finite element analysis (FEA) approaches to require incorporation of constitutive model, such as traction-separation relationship derived from state-of-the-art fracture mechanics fundamental. A physically-based models requires fracture energy values; therefore, properly measured fracture energy value is essential to exhibit better structures response within FEA models. Large arrays of parameters involved during concrete mixture such as beam size effect, aggregate size and concrete grade to affect the flexural resistance in concrete. The fracture and failure in concrete ahead of crack tip is represented by fracture energy values where micro-damage events occurred such as interfacial failure, fiber-bridging and matrix cracking. This study aims to investigate the fracture energy of concrete specimens with combination of notch depth ao at mid-span, design concrete strength as specified in the testing series. Independent compression strength, fc and measured load-displacement profiles under three-points bending test were used to determine fracture energy by incorporating three available fracture energy expressions such as Bazant, Hillerborg and CEB-FIP models
Josephson Current between Triplet and Singlet Superconductors
The Josephson effect between triplet and singlet superconductors is studied.
Josephson current can flow between triplet and singlet superconductors due to
the spin-orbit coupling in the spin-triplet superconductor but it is finite
only when triplet superconductor has , where and
are the perpendicular components of orbital angular momentum and spin angular
momentum of the triplet Cooper pairs, respectively. The recently observed
temperature and orientational dependence of the critical current through a
Josephson junction between UPt and Nb is investigated by considering a
non-unitary triplet state.Comment: 4 pages, no figure
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