As an important source of income for elderly people, pensions have a great impact on their wellbeing. There are three different pension systems in China (the Old-age Insurance System for Government Agencies and Institutions (OISGAI), the Basic Old-age Insurance System for Urban Employees (BOISUE) and the Social Insurance of the Old-age Pension for Urban and Rural Residents (SIOPURR)). This study empirically analyses the impact of various pension types on the happiness of elderly people in China and further explores the potential impact mechanism using the 2014 China Family Panel Studies data. The study suggests that first, receiving pensions from OISGAI, BOISUE and SIOPURR is positively correlated with the happiness level of elderly people. Second, the sense of happiness of elderly people who receive BOISUE is higher than that of those receiving SIOPURR, which is mainly caused by the difference in the level of pension benefits. When the level of benefits is controlled for, there is no significant difference between these two groups. Third, when they have the same level of pension benefits, the happiness of elderly people who receive OISGAI is significantly higher than that of those who receive pensions from the other two systems, which is possibly related to the hidden ‘special’ government guarantee and the difference of the growth rate of the benefit level.

Wind forcing injects energy into mesoscale eddies and near-inertial waves (NIWs) in the ocean, and the NIWs are believed to solve the puzzle of mesoscale energy budget by absorbing energy from mesoscale eddies. This work studies the turbulent energy transfer in the NIW–quasigeostrophic mean mesoscale eddy coupled system based on a previously derived two-dimensional model which inherits conserved quantities in Boussinesq equations (Xie & Vanneste, J. Fluid Mech., vol. 774, 2015, pp. 147–169). The conservation of energy, potential enstrophy and wave action implies the existence of phase transition with a change of the relative strength between NIW and mean-flow, quantified by a parameter $R$ . By running forced-dissipative numerical simulations, we justify the existence of second-order phase transition around a critical value $R_c$ . When $0<R<R_c$ , energy transfers bidirectionally, wave action transfers downscale and vorticity forms strong cyclones. When $R>R_c$ , energy transfers downscale, wave action transfers bidirectionally and vortex filaments are dominant. We find the catalytic wave induction mechanism where the NIW induces a downscale energy flux of the mean flow, which differs from the stimulated loss of balance mechanism observed in inertial value problems. In the parameter regime $0<R<R_c$ , catalytic wave induction is similar to the stimulated loss of balance as the downscale energy transfer is proportional to the NIW energy injection, however, catalytic wave induction has a distinct feature of the absence of energy conversion from mesoscale eddies to NIWs. The new mechanism is effective in the toy-model study, making it potentially important for ocean energetics.

A k-uniform tight cycle $C_s^k$ is a hypergraph on s > k vertices with a cyclic ordering such that every k consecutive vertices under this ordering form an edge. The pair (k, s) is admissible if gcd (k, s) = 1 or k / gcd (k,s) is even. We prove that if $s \ge 2{k^2}$ and H is a k-uniform hypergraph with minimum codegree at least (1/2 + o(1))|V(H)|, then every vertex is covered by a copy of $C_s^k$ . The bound is asymptotically sharp if (k, s) is admissible. Our main tool allows us to arbitrarily rearrange the order in which a tight path wraps around a complete k-partite k-uniform hypergraph, which may be of independent interest.

For hypergraphs F and H, a perfect F-tiling in H is a spanning collection of vertex-disjoint copies of F. For $k \ge 3$ , there are currently only a handful of known F-tiling results when F is k-uniform but not k-partite. If s ≢ 0 mod k, then $C_s^k$ is not k-partite. Here we prove an F-tiling result for a family of non-k-partite k-uniform hypergraphs F. Namely, for $s \ge 5{k^2}$ , every k-uniform hypergraph H with minimum codegree at least (1/2 + 1/(2s) + o(1))|V(H)| has a perfect $C_s^k$ -tiling. Moreover, the bound is asymptotically sharp if k is even and (k, s) is admissible.

Multiple guidelines recommend discontinuation of prophylactic antibiotics <24 hours after surgery. In a multicenter, retrospective cohort of 2,954 mastectomy patients ± immediate breast reconstruction, we found that utilization of prophylactic postdischarge antibiotics varied dramatically at the surgeon level among general surgeons and was virtually universal among plastic surgeons.

A 67-year-old male presents to the emergency department (ED) in respiratory distress secondary to pneumonia. His oxygen saturation is 86% on a nonrebreather, respiratory rate is 32 respirations/minute, blood pressure 147/72 mmHg, heart rate 121 beats/minute, and temperature is 38.7° Celsius. The decision is made to intubate the patient. Fentanyl and propofol are used for analgesia and sedation, and rocuronium is used for paralysis. Using video laryngoscopy, the patient is successfully intubated, and now the ED team is awaiting your orders for the postintubation sedation care of this patient.

The effects of CaTiO3 (CT) and BaZrO3 (BZ) modification upon the crystal structure and electromechanical properties of lead-free Bi0.5Na0.5TiO3–SrTiO3 piezoelectric ceramics were compared within a doping range of 0–4 mol%. The different effects of CT and BZ modification upon the phase transition are clearly observed in the polarization and strain hysteresis loops. The CT-modified specimens maintain strong ferroelectricity without any abnormal enhancement in the electric field-induced strain. However, the addition of as little as 1 mol% BZ induces a transition from a nonergodic relaxor phase to an ergodic relaxor phase, thus resulting in disruption of the ferroelectric order and the generation of a high field-induced strain. The present authors believe that the substitution of large ions (such as Zr4+) into the B-sites, rather than the A-sites, of the Bi0.5Na0.5TiO3-based ceramics plays a significant role in the phase transition behavior.

In her position article, Lee (2019) compellingly argues for focused written corrective feedback (FWCF) and offers clear guidelines for teachers to shift their feedback approach. As English language teaching practitioners in Chinese universities, we share Lee's view against any unthinking adherence to comprehensive written corrective feedback (CWCF) and advocate principled feedback practice. Our response begins by presenting the common ground between Lee's and our stance, followed by problematizing her ‘less-is-more’ argument. Finally, following Lee's guidelines, we propose a few context-specific suggestions to help university teachers in mainland China and other contexts better implement FWCF.

For $n\geq 3$ , let $Q_n\subset \mathbb {C}$ be an arbitrary regular n-sided polygon. We prove that the Cauchy transform $F_{Q_n}$ of the normalised two-dimensional Lebesgue measure on $Q_n$ is univalent and starlike but not convex in $\widehat {\mathbb {C}}\setminus Q_n$ .

Postemergence goosegrass and other grassy weed control in bermudagrass is problematic. Herbicides that can control goosegrass continue to decline due to regulatory pressure and herbicide resistance. Alternative herbicide options that offer effective control are needed. Previous research demonstrates that topramezone controls goosegrass, crabgrass, and other weed species; however, injury to bermudagrass may be unacceptable. The objective of this research was to evaluate safening potential of topramezone combinations with different additives on bermudagrass. Field trials were conducted at Auburn University during summer and fall from 2015 to 2018 and 2017 to 2018, respectively. Treatments included topramezone mixtures and methylated seed oil applied in combination with five different additives including triclopyr, green turf pigment, green turf paint, ammonium sulfate, and chelated iron. Bermudagrass bleaching and necrosis symptoms were visually rated. Normalized difference vegetative index measurements and clipping yield were also collected. Results showed that topramezone plus chelated iron, as well as topramezone plus triclopyr, reduced bleaching potential the best; however, the combination of topramezone plus triclopyr resulted in necrosis that outweighed reductions in bleaching. Masking agents such as green turf paint and green turf pigment were ineffective in reducing injury when applied with topramezone. The combination of topramezone plus ammonium sulfate should be avoided due to the high level of necrosis. Topramezone-associated bleaching symptoms were transient and lasted 7 to 14 days on average. Findings from this research suggest that chelated iron added to topramezone and MSO mixtures acted as a safener on bermudagrass.