Possible molecular states from interactions of charmed baryons

In this work, we perform a systematic study of possible molecular states composed of two charmed baryons including hidden-charm systems $\Lambda_c\bar{\Lambda}_c$, $\Sigma_c^{(*)}\bar{\Sigma}_c^{(*)}$, and $\Lambda_c\bar{\Sigma}_c^{(*)}$, and corresponding double-charm systems $\Lambda_c\Lambda_c$, $\Sigma_c^{(*)}\Sigma_c^{(*)}$, and $\Lambda_c\Sigma_c^{(*)}$. With the help of the heavy quark chiral effective Lagrangians, the interactions are described with $\pi$, $\rho$, $\eta$, $\omega$, $\phi$, and $\sigma$ exchanges. The potential kernels are constructed, and inserted into the quasipotential Bethe-Salpeter equation. The bound states from the interactions considered is studied by searching for the poles of the scattering amplitude. The results suggest that strong attractions exist in both hidden-charm and double-charm systems considered in the current work, and bound states can be produced in most of the systems. More experiment studies about these molecular states are suggested though the nucleon-nucleon collison at LHC and nucleon-antinucleon collison at $\rm \bar{P}ANDA$.Comment: 7 pages, 5 figure

Guidance Law Design for a Class of Dual-Spin Mortars

To minimize the cost and maximize the ease of use, a class of dual-spin mortars is designed which only rely on GPS receiver and geomagnetic measurements. However, there are some problems to be solved when the range is small, such as low correction authority and trajectory bending. Guidance law design for this mortar is detailed. Different guidance laws were designed for the ascending and descending segments, respectively. By taking variable parameter guidance law in the vertical plane and using compensation in the lateral plane, the problems mentioned above were resolved. Roll angle resolving algorithms with geomagnetic measurements were demonstrated and the experiment results proved to be effective. In order to verify the effectiveness, Seven-Degrees-of-Freedom (7-DOF) rigid ballistic model were established and hardware in the loop simulation was introduced. After the transform function of the actuator was obtained, the control model of the shell was improved. The results of the Monte Carlo simulation demonstrate that the guidance law is suitable and the mortar can be effectively controlled

Therapeutic effect of He-Wei-Tong-Xie decoction on acute pancreatitis complicated with gastrointestinal dysfunction

Purpose: To study the therapeutic effect of He-Wei-Tong-Xie (HWXT) decoction on acute pancreatitis (AP) complicated with gastrointestinal dysfunction.Methods: AP patients (50) were recruited from the Teaching Hospital of Chengdu University of Traditional Chinese Medicine and randomly divided into treatment and control groups (25 per group). All patients were evaluated at baseline, and thereafter subjected to standard therapeutic protocols, including, fasting, gastrointestinal decompression, administration of somatostatin and omeprazole. The patients in the treatment group also received 100 mL of HWTX by nasal route with high enema (three times/day). Gastrointestinal function scores (stomach ache, abdominal distension, borborygmus and defecation), and hospitalization time were evaluated on days 3 and 7 of treatment.Results: No significant baseline differences were observed between the treatment and control groups with respect to etiological agents and AP syndrome scores (p > 0.05). However, after 3 and 7 days of treatment, all AP syndromes in treatment group showed significant improvement compared with the control patients (p < 0.01). There were no significant differences in hospitalization time and rate of recovery between the treatment and control groups (p < 0.01).Conclusion: HWTX treatment appears to be a safe and potentially useful approach for treating AP complicated with gastrointestinal dysfunction.Keywords: He-Wei-Tong-Xie decoction, Acute pancreatitis, Gastrointestinal dysfunction, Somatostatin, Omeprazol

Shearing and Mixing Performance of Ultrahigh-Molecular-Weight Hydrolyzed Polyacrylamide (HPAM) Solution in a Helixes Static Mixer

Static mixers have been widely used to dilute high viscosity, high-molecular-weight polymer mother liquor for polymer flooding, in which the mixing performance plays a critical role. In this work, a novel mixing configuration, named as Helixes static mixer, was proposed to reduce high viscosity degradation rate of polyacrylamide solution resulting from mechanical shear during mixing process. Computational fluid dynamics simulations along with experiments were performed to investigate the mixing process. Several criteria such as the intensity of segregation, mixing distance, pressure loss, and shear strain rate were used to evaluate the mixing and shear performance of static mixers. Compared to the SMX and Kenics static mixer, a longer mixing distance is needed for the Helixes static mixer to achieve an ideal mixture. A lower shear strain rate along with less viscosity degradation rate is obtained in flow field of Helixes static mixer. The spiral-lead and helical directions of mixing elements were optimized to improve mixing performance. Experimental results are in good agreement with the numerical simulations on the intensity of segregation. The viscosity degradation rate of HPAM solution which flows through Helixes static mixer is lower than that of SMX and Kenics static mixers