Explore the vast range of titles available.

Stimulated by the recent experimental results on the fully-charm tetraquark states, we systematically calculate the mass spectra of the fully-charm tetraquark states in 8 [ c c ¯ ] ⊗ 8 [ c c ¯ ] color configuration via QCD sum rules. By constructing nine 8 [ c c ¯ ] ⊗ 8 [ c c ¯ ] type currents with quantum numbers J PC = 0 - + , 0 - - , 1 - + , 1 + - , 1 - - and 2 + + , we perform analytic calculation up to dimension six in the operator product expansion (OPE). We find the fully-charm tetraquark states with J PC = 1 + - , 2 + + lie around 6.48 ∼ 6.62 GeV while the fully-charm tetraquark states with J PC = 0 - + , 0 - - , 1 - - , 1 - + are about 6.85 ∼ 7.02 GeV. Notably, the mass predictions for the c c ¯ c c ¯ tetraquarks, specifically those with J PC = 2 + + , align with the broad structure identified by LHCb. Moreover, the masses of fully-charm tetraquarks with J PC = 0 - + and 1 - + are anticipated to match closely with the mass of X(6900), considering the margin of error. Such findings hint at the presence of some 8 [ c c ¯ ] ⊗ 8 [ c c ¯ ] components within the di- J / ψ structures observed by LHCb. The predictions for tetraquark states with J PC = 0 - - , 1 + - , 1 - - may be accessible in the future BelleII, Super-B, PANDA, and LHCb experiments.

This paper proposes an optimal fuzzy proportional–integral–derivative (PID) controller design based on conventional PID control and nonlinear factors. With the equivalence between fuzzy logic controllers (FLCs) and conventional PID controllers, a conventional PID controller design can be rapidly transformed into an equivalent FLC by defining the operating ranges of the input/output of the controller. The proposed nonlinear factors can further tune the nonlinearity of the membership functions (MFs) distributed in the operating ranges. In this manner, a fuzzy PID controller can be developed with less parameters and optimized by using the genetic algorithm (GA). In addition, the aforementioned equivalent FLC can act as one individual in the initial population of GA, and significantly enhances the GA efficiency. Simulation results demonstrate the feasibility of this technique. This resulted in an optimal fuzzy PID controller design with only eight parameters with a concise controller structure, and most importantly, the optimal fuzzy PID controller design is now more systematic.

Inspired by the experimental measurement of the charmed hadronic state X(6900), we calculate the mass spectra of tetraquark hybrid states with configuration of [ 8 c ] Q Q ¯ ⊗ [ 8 c ] G ⊗ [ 8 c ] Q Q ¯ in color, by virtue of QCD sum rules. The two feasible types of currents with quantum numbers J PC = 0 + + and 0 - + are investigated, in which the contributions from operators up to dimension six are taken into account in operator product expansion (OPE). In the end, we find that, in charm sector, the tetracharm hybrid states with quantum number 0 + + has a mass of about 6 . 98 - 0.14 + 0.16 GeV , while 0 - + state mass is about 7 . 26 - 0.15 + 0.16 GeV . The results overlap with the experimental observations, suggesting potential tetracharm hybrid interpretations. In bottom sector, calculation shows that the masses of tetrabottom hybrid states with quantum numbers 0 + + and 0 - + are 19 . 30 - 0.17 + 0.16 GeV and 19 . 50 - 0.17 + 0.17 GeV , respectively, which are left for future experimental confirmation.

PurposeThis paper aims to examine whether employee subjective well-being acts as a mediator in the relationship between perceived supervisor support and turnover intention within the context of select-service hotels.Design/methodology/approachThe sample included hourly employees in select-service hotels in the Midwest USA. The significance of the relationships was assessed using regression, and both the Sobel test and bootstrapping methods were performed to test the mediating effect of subjective well-being on the relationship between perceived supervisor support and turnover intention.FindingsThe results confirm subjective well-being acted as a partial mediator in the relationship between supervisor support and turnover intention. Employees who perceive higher levels of support from their supervisors are less likely to leave their organizations. At the same time, supervisor support also positively affects subjective well-being, which reduces turnover intention.Practical implicationsActions by supervisors’ impact the well-being of their employees, which in turn may influence whether an employee stays with the organization. Organizations could use management training and employee feedback on supervisor support to improve employee support mechanisms. Organizations should also pay attention to improving employee subjective well-being beyond the work place. Improving the well-being of employees and supporting employees can help reduce turnover and may increase employee satisfaction, guest satisfaction and profits.Originality/valueThis study is the first to show that subjective well-being mediates the relationship between supervisor support and turnover intention; and one of the few within the hospitality context to examine the constructs of subjective well-being, supervisor support and turnover together.

In this article, we study the mass spectrum of the low-lying triply heavy hybrid baryon, which consists of three valence heavy quarks in a color octet and one valence gluon, with spin-parity J P = ( 1 2 ) + via QCD sum rules. This is the first study on the triply heavy hybrid baryons in the framework of QCD sum rules. After performing the QCD sum rule analysis, we find that the mass of cccg hybrid baryon lies in M cccg = 5.91–6.13 GeV. As a byproduct, the mass of the triply bottom hybrid baryon state is extracted to be around M bbbg = 14.62–14.82 GeV. The contributions up to dimension eight at the leading order of α s (LO) in the operator product expansion are taken into account in the calculation. The triply charmed hybrid baryon predicted in this work can decay into one doubly charmed baryon and one charmed meson. Especially, we propose to search for cccg hybrid baryon with J P = ( 1 / 2 ) + in the P-wave decay channels Ξ cc + + D 0 , Ξ cc + D + , and Ξ ccs + D s + , which may be accessible in future BelleII, Super-B, PANDA, and LHCb experiments.

To slow the spread of infectious disease, it is crucial to understand the engagement of protective behavior among individuals. The purpose of this study was to systematically examine individuals’ protective behaviors and the associated factors across countries during COVID - 19. This causal-comparative study used a self-developed online survey to assess individuals’ level of engagement with six protective behaviors. Analysis of variance and McNemar’s test were employed for data analysis. Three hundred and eighty-four responses were analyzed. The majority of participants lived in three areas: Taiwan, Japan, and North America. Overall, the participants reported a high level of engagement in protective behaviors. However, engagement levels varied according to several demographic variables. Hand hygiene and cleaning/ventilation are two independent behaviors that differ from almost all other protective behaviors. There is a need to target the population at risk, which demonstrates low compliance. Different strategies are needed to promote specific protective behaviors.

Acute kidney injury (AKI), as a common oxidative stress‐related renal disease, causes high mortality in clinics annually, and many other clinical diseases, including the pandemic COVID‐19, have a high potential to cause AKI, yet only rehydration, renal dialysis, and other supportive therapies are available for AKI in the clinics. Nanotechnology‐mediated antioxidant therapy represents a promising therapeutic strategy for AKI treatment. However, current enzyme‐mimicking nanoantioxidants show poor biocompatibility and biodegradability, as well as non‐specific ROS level regulation, further potentially causing deleterious adverse effects. Herein, the authors report a novel non‐enzymatic antioxidant strategy based on ultrathin Ti3C2‐PVP nanosheets (TPNS) with excellent biocompatibility and great chemical reactivity toward multiple ROS for AKI treatment. These TPNS nanosheets exhibit enzyme/ROS‐triggered biodegradability and broad‐spectrum ROS scavenging ability through the readily occurring redox reaction between Ti3C2 and various ROS, as verified by theoretical calculations. Furthermore, both in vivo and in vitro experiments demonstrate that TPNS can serve as efficient antioxidant platforms to scavenge the overexpressed ROS and subsequently suppress oxidative stress‐induced inflammatory response through inhibition of NF‐κB signal pathway for AKI treatment. This study highlights a new type of therapeutic agent, that is, the redox‐mediated non‐enzymatic antioxidant MXene nanoplatforms in treatment of AKI and other ROS‐associated diseases. A novel non‐enzymatic antioxidant MXene nanoplatform with excellent biocompatibility and great chemical reactivity toward multiple ROS is developed to potentially scavenge the overexpressed ROS and subsequently suppress oxidative stress‐induced inflammatory response through the inhibition of NF‐κB signaling pathway in the prevention and treatment of AKI and other ROS‐related diseases.

Developing efficient water-splitting electrocatalysts, particularly for the anodic oxygen evolution reaction （OER）, is an important challenge in energy conversion technologies. In this study, we report the development of iron-doped nickel disulfide nanoarray on Ti mesh （Fe0.1-NiS2 NA/Ti） via the sulfidation of its nickel-iron-layered double hydroxide precursor （NiFe-LDH NAFFi）. As a three-dimensional OER anode, Fe0.1NiS2 NA/Ti exhibits remarkable activity and stability in 1.0 M KOH, with the requirement of a low overpotential of 231 mV to achieve 100 mA·cm^-2. In addition, it exhibits excellent activity and durability in 30 wt.% KOH. Notably, this electrode is also efficient for the cathodic hydrogen evolution reaction under alkaline conditions.

The structure of the METTL3–METTL14 complex, which mediates N 6 -adenosine methylation of RNA, suggests that the METTL3 subunit is the catalytic core while METTL14 serves to bind RNA. A window on m 6 A epitranscriptomics The various base modifications now known to occur in messenger RNA and long non-coding RNA are reversible, and are utilized to dynamically modify the function of the RNA. The N 6 -methyladenosine modification is removed by an enzyme complex comprising METTL3 and METTL14. Ping Yin and colleagues have solved structures of the methyltransferase domains of this heterodimeric complex with and without ligand. Surprisingly, the S -adenosyl methionine ligand was found only the METTL3 pocket, not in METTL14. This suggests a model in which there is a single catalytic subunit, with METTL3 functioning as an RNA binding platform. The reported structures provide unprecedented mechanistic insight into m 6 A RNA methylation and suggest new opportunities for the development of therapeutic agents. Chemical modifications of RNA have essential roles in a vast range of cellular processes 1 , 2 , 3 . N 6 -methyladenosine (m 6 A) is an abundant internal modification in messenger RNA and long non-coding RNA that can be dynamically added and removed by RNA methyltransferases (MTases) and demethylases, respectively 2 , 3 , 4 , 5 . An MTase complex comprising methyltransferase-like 3 (METTL3) and methyltransferase-like 14 (METTL14) efficiently catalyses methyl group transfer 6 , 7 . In contrast to the well-studied DNA MTase 8 , the exact roles of these two RNA MTases in the complex remain to be elucidated. Here we report the crystal structures of the METTL3–METTL14 heterodimer with MTase domains in the ligand-free, S -adenosyl methionine (AdoMet)-bound and S -adenosyl homocysteine (AdoHcy)-bound states, with resolutions of 1.9, 1.71 and 1.61 Å, respectively. Both METTL3 and METTL14 adopt a class I MTase fold and they interact with each other via an extensive hydrogen bonding network, generating a positively charged groove. Notably, AdoMet was observed in only the METTL3 pocket and not in METTL14. Combined with biochemical analysis, these results suggest that in the m 6 A MTase complex, METTL3 primarily functions as the catalytic core, while METTL14 serves as an RNA-binding platform, reminiscent of the target recognition domain of DNA N 6 -adenine MTase 9 , 10 . This structural information provides an important framework for the functional investigation of m 6 A.

Solar interfacial vapor generation based on low evaporation energy requirements is an effective technology to speed up water purification under natural sunlight, offering great potential to alleviate the current global water crisis. The external electric field and hydrogel are two independent methods enabling low‐energy water evaporation. However, the complicated external equipment for generating an electric field and the restricted activation area of hydrogels significantly limit their practical application in steam generation. Thus, a piezoelectric fiber membrane is embedded into a highly hydratable light‐absorbing poly(vinyl alcohol) (PVA) hydrogel for synergistic water activation. The integrated evaporator is capable of continuously converting the wave energy reserved in the ocean into electrical energy, activating the water in the hydrogel. It is found that the activation effect leads to an improvement of over 23% compared to a non‐piezoelectric hydrogel evaporator. This work provides an evaporation prototype based on the synergistic water activation of wave‐triggered electricity and highly hydratable hydrogel. A self‐powered solar water purification technique containing an all‐in‐one composite film evaporator composed of light‐absorbing hydrogel and piezoelectric fiber membrane, which triggers water activation in the hydrogel to synergistically combat the intrinsically high energy demand for water vaporization, thus delivering a high steam generation rate of 2.702 kg m−2 h−1 with an improvement of ≈23% compared to the non‐piezoelectric evaporator under one sun, is presented.