11,044 research outputs found
The Role of Tensor Force in Heavy-Ion Fusion Dynamics
The tensor force is implemented into the time-dependent Hartree-Fock (TDHF)
theory so that both exotic and stable collision partners, as well as their
dynamics in heavy-ion fusion, can be described microscopically. The role of
tensor force on fusion dynamics is systematically investigated for
, ,
, , and
reactions which vary by the total number of
spin-unsaturated magic numbers in target and projectile. A notable effect on
fusion barriers and cross sections is observed by the inclusion of tensor
force. The origin of this effect is analyzed. The influence of isoscalar and
isovector tensor terms is investigated with the T forces. These effects of
tensor force in fusion dynamics are essentially attributed to the shift of
low-lying vibration states of colliding partners and nucleon transfer in the
asymmetric reactions. Our calculations of above-barrier fusion cross sections
also show that tensor force does not significantly affect the dynamical
dissipation at near-barrier energies
Quantum metrology enhanced by the spin interaction in a generalized Tavis-Cummings model
Quantum metrology is recognized for its capability to offer high-precision
estimation by utilizing quantum resources, such as quantum entanglement. Here,
we propose a generalized Tavis-Cummings model by introducing the spin
interaction to explore the impact of the many-body effect on estimation
precision, quantified by the quantum Fisher information (QFI). By deriving the
effective description of our model, we establish a closed relationship between
the QFI and the spin fluctuation induced by the spin interaction. Based on
this exact relation, we emphasize the indispensable role of the spin anisotropy
in achieving the Heisenberg-scaling precision for estimating a weak magnetic
field. Furthermore, we observe that the estimation precision can be enhanced by
increasing the strength of the spin anisotropy. We also reveal a clear scaling
transition of the QFI in the Tavis-Cummings model with the reduced Ising
interaction. Our results contribute to the enrichment of metrology theory by
considering many-body effects, and they also present an alternative approach to
improving the estimation precision by harnessing the power provided by
many-body quantum phases
Role of Phosphatidylinositol-3-Kinase Pathway in Head and Neck Squamous Cell Carcinoma
Activation of the phosphatidylinositol-3-kinase (PI3K) pathway is one of the most frequently observed molecular alterations in many human malignancies, including head and neck squamous cell carcinoma (HNSCC). A growing body of evidence demonstrates the prime importance of the PI3K pathway at each stage of tumorigenesis, that is, tumor initiation, progression, recurrence, and metastasis. Expectedly, targeting the PI3K pathway yields some promising results in both preclinical studies and clinical trials for certain cancer patients. However, there are still many questions that need to be answered, given the complexity of this pathway and the existence of its multiple feedback loops and interactions with other signaling pathways. In this paper, we will summarize recent advances in the understanding of the PI3K pathway role in human malignancies, with an emphasis on HNSCC, and discuss the clinical applications and future direction of this field
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