Dynamical Effect of the Turbulence of IGM on the Baryon Fraction Distribution

We investigate the dynamical effect of the turbulence in baryonic intergalactic medium (IGM) on the baryon fraction distribution. In the fully developed nonlinear regime, the IGM will evolve into the state of turbulence, containing strong and curved shocks, vorticity and complex structures. Turbulence would lead to the density and velocity fields of the IGM to be different from those of underlying collisionless dark matter. Consequently, the baryon fraction f_b will deviate from its cosmic mean . We study these phenomena with simulation samples produced by the weighted essentially non-oscillatory (WENO) hybrid cosmological hydrodynamic/N-body code, which is effective of capturing shocks and complex structures. We find that the distribution of baryon fraction is highly nonuniform on scales from hundreds kpc to a few of Mpc, and f_b varies from as low as 1% to a few times of the cosmic mean. We further show that the turbulence pressure in the IGM is weakly scale-dependent and comparable to the gravitational energy density of halos with mass around 10^11 h-1 M\odot . The baryon fraction in halos with mass equal to or smaller than 10^11 h^-1 M\odot should be substantially lower than f_b^cosmic. Numerical results show that f_b is decreasing from 0.8 f_b^cosmic at halo mass scales around 10^12 h^-1 M\odot to 0.3f_b^cosmic at 10^11 h^-1 M\odot and shows further decrease when halo mass is less than 10^11 h^-1 M\odot. The strong mass dependence of f_b is similar to the observed results. Although the simulated f_b in halos are higher than the observed value by a factor of 2, the turbulence of the IGM should be an important dynamical reason leading to the remarkable missing of baryonic matter in halos with mass \leq 10^12 h^-1 M\odot.Comment: Accepted for publication in MNRAS, 12 pages, 10 figure

Research on the relationship between challenging-hindrance stress and employee health based on cross-sectional data by structural equation modeling

Innovations in economic development have highlighted the role of talent, and focusing on employees’ work stress and its impact on employees’ health contributes to the continued development of employees and companies. This article aims to propose the work stress-employee health model and hypotheses under the moderation of perceived organizational support (POS) and self-efficacy. We select appropriate scales; collected 428 responses from questionnaire survey and explored the different effects of challenging/hindrance stress (CS/HS) on the employee’s physical/mental health, and the mechanism of POS and self-efficacy. The results indicated that: (1) CS has a significant positive impact on employees’ mental health; (2) HS has a significant negative impact on employees’ physical and mental health; (3) POS and selfefficacy have moderating effect on the relationship between CS and employees’ mental health, HS and employees’ physical and mental health

Three-Point Bending Behaviour of a Fabricated Concrete Connection with Steel Plate Hoop and Bolts

As the development of building industrialization and housing industrialization is speeding up in China, the application of precast concrete structure has been the research focus. The connection of prefabricated components is one of the key technologies in prefabricated concrete structure. So, a new type of column–column connection with steel plate hoop and bolts is proposed in this paper to promote the application of precast concrete structure. In order to reveal the flexural behavior and force transfer mechanism about this new type connection, six precast concrete beams and one integral casting beam were tested by the three-point bending under loading and unloading cycle. The comparative analysis is made between the new type connection and traditional integral cast-in-place member from the aspects of test phenomenon, failure mode, and load-deflection relationship. The analysis results show that the new type connection has the same bending bearing capacity as the integral casting member. Based on the analysis of the load-strain relationship of longitudinal reinforcement, bolts, and steel plate hoop, the moment transmission mechanism and theoretical calculation formula of the new type connection are proposed, and the theoretical calculation results are consistent with the experimental results

Research on the relationship between social network sites use and employee well-being based on cross-sectional data by structural equation modeling

With the rapid rise of social network sites, people’s life and work are influenced to varying degrees. And this paper aims to explore how does social network sites use(SNSU) affect employee well-being(EWB) and the mediating effects of body image disturbance(BID) and self-esteem(SE). Social network sites use, employee well-being, body image disturbance and self-esteem scales were used to obtain data of 435 employees. Results showed that social network sites use positively predicted employee well-being; Self-esteem played a mediating role in the relationship between social network sites use and employee well-being, but the mediation of body image disturbance and the chain mediation of body image disturbance and self-esteem weren’t significant. So social network sites use can lead to body image disturbance to some extent but overall, its impact was positive, which was contributing to employee well-being

Konjac Glucomannan Oligosaccharides Prevent Intestinal Inflammation Through SIGNR1-Mediated Regulation of Alternatively Activated Macrophages

SCOPE: Konjac glucomannan oligosaccharides (KMOS) are prebiotics and may improve intestinal immunity through modulation of macrophage function. However, the underlying molecular mechanisms were unclear. METHODS AND RESULTS: Using a mouse model of dextran sulfated sodium (DSS)-induced acute colitis, the study demonstrates here that KMOS (400 mg kg d ) can ameliorate intestinal inflammation in a macrophage dependent manner. Oral exposure to KMOS prevents DSS-induced intestinal pathology, improves epithelial integrity, and decreases accumulation of colonic inflammatory leukocytes and cytokines. The therapeutic effects of KMOS are dependent on the function of macrophages, as depletion of macrophages abolished the effects. In colonic lamina propria of DSS-treated mice, as well as in vitro culture of bone marrow derived macrophages (BMDMs), KMOS skews reprogramming of classically activated macrophages (CAM/M1) into alternatively activated macrophages (AAM/M2). The study further determines that the activation of SIGNR1/phospho-c-Raf (S338)/phospho-p65 (S276)/acetyl-p65 (K310) pathway is responsible for KMOS-induced AAM/M2 polarization. Blockage of SIGNR1 abolishes KMOS-induced AAM/M2 polarization of activated macrophages, expression of phospho-p65 (S276) in colonic macrophages, and alleviation of DSS-induced colitis in mice, suggesting that SIGNR1 is critical for macrophage responses to KMOS. CONCLUSIONS: This study reveals a SIGNR1-mediated macrophage-dependent pathway that supports regulatory function of KMOS in host immunity and intestinal homeostasis