Deuteron-like states composed of two doubly charmed baryons

We present a systematic investigation of the possible molecular states composed of a pair of doubly charmed baryons ($\Xi_{cc}\Xi_{cc}$) or one doubly charmed baryon and one doubly charmed antibaryon $(\Xi_{cc}\bar{\Xi}_{cc})$ within the framework of the one-boson-exchange-potential model. For the spin-triplet systems, we take into account the mixing between the ${}^3S_1$ and ${}^3D_1$ channels. For the baryon-baryon system $\Xi_{cc}\Xi_{cc}$ with $(R,I) = (\bar{3}, 1/2)$ and $(\bar{3}, 0)$, where $R$ and $I$ represent the group representation and the isospin of the system, respectively, there exist loosely bound molecular states. For the baryon-antibaryon system $\Xi_{cc}\bar{\Xi}_{cc}$ with $(R,I) = (8, 1)$, $(8, 1/2)$ and $(8,0)$, there also exist deuteron-like molecules. The $B_{cc}\bar{B}_{cc}$ molecular states may be produced at LHC. The proximity of their masses to the threshold of two doubly charmed baryons provides a clean clue to identify them.Comment: 18 pages, 8 figure

Possible hadronic molecules composed of the doubly charmed baryon and nucleon

We perform a systematical investigation of the possible deuteron-like bound states with configuration $\Xi_{cc}N (\bar{N})$, where $N(\bar{N})$ denotes the nucleon (anti-nucleon), in the framework of the one-boson-exchange-potential model. In the spin-triplet sector we take into account both the ${}^3S_1$ and ${}^3D_1$ channels due to non-vanishing tensor force. There exist several candidates of the loosely bound molecular states for the $\Xi_{cc}N$ and $\Xi_{cc}\bar{N}$ systems, which lie below the threshold of $\Lambda_c\Lambda_c$ or $\Lambda_c{\bar\Lambda}_c$. We also investigate the possible loosely bound states with configurations $\Lambda_cN(\bar{N})$ and $\Sigma_cN(\bar{N})$. These molecular candidates may be searched for at Belle II and LHC in the near future.Comment: 14 pages, 5 figure

Large eddy simulation of turbulent flows with property variations, rotation and complex geometry

A compressible finite volume formulation for large eddy simulation has been extended to solve a variety of flows by using dynamic subgrid-scale stress model and dynamic Prandtl number model. The basic features of this finite volume formulation include a dual time stepping approach with time derivative preconditioning, an implicit low-upper symmetric Gauss-Seidel scheme, multiblock framework, and parallelization using message passing interface;Implementation of the dynamic model is validated by simulating a plane channel flow with constant heat flux. Good agreement between the present results and benchmark results in the literature is observed. Rotating channel flows with heat transfer are studied by adding a rotation source term. The effects of system rotation on the turbulent heat transfer are investigated. Finally, a rib-roughened channel flow is simulated both with and without heat transfer;The large eddy formulation with a dynamic model generally provided excellent agreement with direct numerical simulation results and experimental results for turbulent flows with heat transfer. For the constant heat flux channel flows, high heating tends to reduce the velocity fluctuations, while high cooling tends to enhance the fluctuations. The mean and fluctuation velocity profiles approach the incompressible results when normalized by local properties, as opposed to wall values. Spanwise system rotation is found to suppress turbulent velocity fluctuations and shear stresses near the stable side of the channel, but enhance the fluctuations and shear stresses near the unstable side. Turbulent temperature fluctuations and turbulent heat flux decreased near the stable side of the channel, but increased near the unstable side of the channel. In the case of the rib-roughened channel flow, a small recirculation zone before the rib and a larger recirculation zone after the rib are observed. Increased turbulent fluctuations and heat transfer are found around the rib

Surface diffuseness correction in global mass formula

By taking into account the surface diffuseness correction for unstable nuclei, the accuracy of the macroscopic-microscopic mass formula is further improved. The rms deviation with respect to essentially all the available mass data falls to 298 keV, crossing the 0.3 MeV accuracy threshold for the first time within the mean-field framework. Considering the surface effect of the symmetry potential which plays an important role in the evolution of the "neutron skin" toward the "neutron halo" of nuclei approaching the neutron drip line, we obtain an optimal value of the symmetry energy coefficient J=30.16 MeV. With an accuracy of 258 keV for all the available neutron separation energies and of 237 keV for the alpha-decay Q-values of super-heavy nuclei, the proposed mass formula is particularly important not only for the reliable description of the r-process of nucleosynthesis but also for the study of the synthesis of super-heavy nuclei.Comment: 2 figures, 2 tables, to appear in Phys. Lett.

Lesbians and Their Mothers: A Taiwanese Experience

Many studies, both in the United States and in Taiwan, have explored how the coming-out experience influenced LGBT individuals and their families, and some studies have also addressed how their familial relationships have been shaped because of the experience. As a Taiwanese who has studied family therapy in the United States, my personal experience as well as research and professional interest brought me to conduct this qualitative study focusing on the experience of coming out in mother-daughter relationships in Taiwan. Nine dyads of mothers and daughters were interviewed and provided their retrospective accounts of their experience of disclosure and how they made meaning of this particular experience. Both parties shared their perspectives on the process of coming out, and mothers addressed their process of acceptance as well as other family members\u27 reactions. Results indicated that disclosure could be seen as a special event that was embedded and then processed in the mother-daughter relationship; therefore the nature of the parent-child relationship was very influential in how the disclosure was treated. In addition, Confucianism beliefs address the importance of the role of each family member, and these beliefs appear to influence how mothers and daughters interact and shape their relationship. Also, family dynamics had a great impact on these dyads\u27 experience of coming out and mothers\u27 levels of acceptance, which resonated with previous findings that family values are crucial to people from Asian cultural heritage. Rather than focusing on preparing a perfect disclosure event, it seems as if therapists should pay more attention to disclosure and acceptance as an ongoing process

Soft-Defined Heterogeneous Vehicular Network: Architecture and Challenges

Heterogeneous Vehicular NETworks (HetVNETs) can meet various quality-of-service (QoS) requirements for intelligent transport system (ITS) services by integrating different access networks coherently. However, the current network architecture for HetVNET cannot efficiently deal with the increasing demands of rapidly changing network landscape. Thanks to the centralization and flexibility of the cloud radio access network (Cloud-RAN), soft-defined networking (SDN) can conveniently be applied to support the dynamic nature of future HetVNET functions and various applications while reducing the operating costs. In this paper, we first propose the multi-layer Cloud RAN architecture for implementing the new network, where the multi-domain resources can be exploited as needed for vehicle users. Then, the high-level design of soft-defined HetVNET is presented in detail. Finally, we briefly discuss key challenges and solutions for this new network, corroborating its feasibility in the emerging fifth-generation (5G) era