Association between Mental Health Literacy and Workplace Well-Being of Chinese Grassroots Civil Servants:The Chain Mediating Effects of Regulatory Emotional Self-Efficacy and Resilience

This study aimed to investigate the relationship between mental health literacy(MHL)and workplace well-being(WWB)of Chinese grassroots civil servants,with regulatory emotional self-efficacy(RESE)and resilience as mediating variables.A questionnaire survey was conducted among Chinese grassroots civil servants,with a valid sample size of 2673 after excluding missing values and conducting relevant data processing.The PROCESS was used to examine the relationship between MHL,RESE,resilience,and WWB.The study found that MHL among grassroots civil servants was positively and significantly correlated with WWB(r=0.73,p<0.01).RESE partially mediated the relationship between MHL and WWB(β=0.25,95%CI[0.22,0.28]).Resilience partially mediated the relationship between MHL and WWB(β=0.22,95%CI[0.19,0.26]).MHL had a positive effect on WWB through the chain mediating effect of RESE and resilience(β=0.05,95%CI[0.03,0.07]).There is a close relationship between MHL and WWB,where Chinese grassroots civil servants with higher levels of MHL can develop stronger RESE and resilience,leading to higher WWB.The results of this study remind organizational institutions of Chinese grassroots civil servants that enhancing MHL,RESE,and resilience is an important pathway to promoting their WWB.

基于质和量测度视角的云南省州市城市化水平研究

为了科学的测度云南省州市城市化水平,在国内已有的“城市化质量”理论和研究的基础上,结合云南省山地多平地少的自然地理状况,从“质”和“量”测度的视角完善土地城市化率指标,构建新的城市化测度体系,并用纵横向拉开档次法赋权。基于每个研究区12年的城市化水平数据,进行各个研究区城市化水平灰色系统预测模型构建,得出12个时间响应式,并对时间响应式进行了检验。用各地区的时间响应式预测出各地区2025年的城市化水平。进行三个时间节点的云南省州市城市化水平分析、城市化水平时间序列分析和城市化水平空间分析,结论为:(1)2006年、2017年和2025年云南省城市化水平总体偏低,但2025年有提升趋势;(2)2006年至2017年,大部分研究区的城市化水平都呈现降—升—降的变化特点;(3)滇中城市群为城市化水平高—高集聚区;(4)昭通市、文山州和普洱市为城市化水平低—高集聚区;(5)迪庆州、保山市、临沧市、西双版纳州为城市化水平低—低集聚区。

多孔泡沫铜和硫脲协同作用构筑无枝晶锂负极

锂金属作为下一代储能电池的理想负极材料一直受到极大的关注,然而锂枝晶的不可控生长和负极副反应带来的低库伦效率问题严重限制了锂金属电池的发展。这里,我们提出了一种多孔泡沫铜和硫脲协同作用的策略,利用硫脲分子的超填充作用实现锂金属在多孔泡沫铜表面的均匀沉积。在电解液中添加0.02 mol·L^(-1)硫脲作为电解质添加剂,采用多孔泡沫铜的Li||Cu半电池在循环300圈以后,库伦效率仍保持在98%以上。此外,在5C的高倍率条件下,Li||Li FePO4全电池循环300圈以后仍有94%的容量保持率。本工作为锂金属负极保护提供了一种新的策略并且该策略也可以扩展到其他金属负极保护中,非常有利于下一代高能量密度储能电池的开发。

Codebook Design and Beam Training for Extremely Large-Scale RIS:Far-Field or Near-Field?

Reconfigurable intelligent surface(RIS)is more likely to develop into extremely large-scale RIS(XL-RIS)to efficiently boost the system capacity for future 6 G communications.Beam training is an effective way to acquire channel state information(CSI)for XL-RIS.Existing beam training schemes rely on the far-field codebook.However,due to the large aperture of XL-RIS,the scatters are more likely to be in the near-field region of XL-RIS.The far-field codebook mismatches the near-field channel model.Thus,the existing far-field beam training scheme will cause severe performance loss in the XL-RIS assisted nearfield communications.To solve this problem,we propose the efficient near-field beam training schemes by designing the near-field codebook to match the nearfield channel model.Specifically,we firstly design the near-field codebook by considering the near-field cascaded array steering vector of XL-RIS.Then,the optimal codeword for XL-RIS is obtained by the exhausted training procedure.To reduce the beam training overhead,we further design a hierarchical nearfield codebook and propose the corresponding hierarchical near-field beam training scheme,where different levels of sub-codebooks are searched in turn with reduced codebook size.Simulation results show the proposed near-field beam training schemes outperform the existing far-field beam training scheme.

AIRIS:Artificial Intelligence Enhanced Signal Processing in Reconfigurable Intelligent Surface Communications

Reconfigurable intelligent surface(RIS)is an emerging meta-surface that can provide additional communications links through reflecting the signals,and has been recognized as a strong candidate of 6G mobile communications systems.Meanwhile,it has been recently admitted that implementing artificial intelligence(AI)into RIS communications will extensively benefit the reconfiguration capacity and enhance the robustness to complicated transmission environments.Besides the conventional model-driven approaches,AI can also deal with the existing signal processing problems in a data-driven manner via digging the inherent characteristic from the real data.Hence,AI is particularly suitable for the signal processing problems over RIS networks under unideal scenarios like modeling mismatching,insufficient resource,hardware impairment,as well as dynamical transmissions.As one of the earliest survey papers,we will introduce the merging of AI and RIS,called AIRIS,over various signal processing topics,including environmental sensing,channel acquisition,beamforming design,and resource scheduling,etc.We will also discuss the challenges of AIRIS and present some interesting future directions.

Stem cell microencapsulation maintains stemness in inflammatory microenvironment

Maintaining the stemness of the transplanted stem cell spheroids in an inflammatory microenvironment is challenging but important in regenerative medicine. Direct delivery of stem cells to repair periodontal defects may yield suboptimal effects due to the complexity of the periodontal inflammatory environment. Herein, stem cell spheroid is encapsulated by interfacial assembly of metal-phenolic network(MPN) nanofilm to form a stem cell microsphere capsule. Specifically, periodontal ligament stem cells(PDLSCs) spheroid was coated with FeⅢ/tannic acid coordination network to obtain spheroid@[FeⅢ-TA] microcapsules. The formed biodegradable MPN biointerface acted as a cytoprotective barrier and exhibited antioxidative, antibacterial and anti-inflammatory activities, effectively remodeling the inflammatory microenvironment and maintaining the stemness of PDLSCs. The stem cell microencapsulation proposed in this study can be applied to multiple stem cells with various functional metal ion/polyphenol coordination, providing a simple yet efficient delivery strategy for stem cell stemness maintenance in an inflammatory environment toward a better therapeutic outcome.

Iridic oxide nanoparticles grown in situ on BCN nanotubes as highly efficient dual electrocatalyst for rechargeable lithium-O2 batteries

Oxygen cathode catalysts can significantly address the issues faced by Li-O2 battery.In this research,a composite of IrO2 nanoparticles grown in situ on BCN nanotubes(IrO2@BCNNTs)has been synthesized by facile hydrothermal method,which is initially fabricated as cathode catalyst for Li-O2 battery.The results indicate that IrO2@BCNNTs nanocomposite has a better effect on improving the actual discharge capacity,voltage gap and cyclability of Li-O2 battery.In addition,it is also demonstrated that the Ir O2@BCNNTs composite exhibits bifunctional characteristics for both the oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)through rotating disk electrode(RDE)measurements.The excellent performances of the synthesized catalyst may be attributed to the unique interconnected tubular structure and strong synergistic effect,which can provide more charged sites and defect sites and then facilitate reversible Li2 O2 formation and decomposition.Therefore,it is promising for applying the rational design of the bifunctional catalyst to Li-O2 battery.

Cubic Metric Reduction for Repetitive CAZAC Sequences in Frequency Domain

To meet the requirements of Occupied Channel Bandwidth(OCB)of unlicensed spectrum,in NR-based Access to Unlicensed Spectrum(NR-U)of 5G New Radio(NR)system,the channels of PRACH and PUCCH have to employ some frequency domain sequence repetition schemes.These repeti-tion schemes cause serious Cubic Metric(CM)prob-lems for these channels,although these two types of channels are composed of Constant Amplitude Zero Auto-correlation(CAZAC)sequences.Considering the properties of CAZAC sequences,which are used for PRACH and PUCCH(refer to PUCCH format 0 and format 1)in 5G NR system,in this paper,we pro-pose some new schemes of CM reduction for these two channels taking into account the design princi-ples to ensure the sequence performance of the auto-correlation and cross-correlation.Then the recom-mended CM reduction schemes are evaluated and the optimized parameters are further provided considering both CM performance and the complexity.

Perovskite oxides La_(0.4)Sr_(0.6)Co_xMn_(1-x)O_3(x=0,0.2,0.4) as an effective electrocatalyst for lithium-air batteries

Co-doped perovskite oxide La_(0.4)Sr_(0.6)Co_xMn_(1-x)O_3(x=0, 0.2, 0.4) composites are prepared by sol-gel method utilizing citric acid as chelating agent. These composites show good catalytic activities when tested as catalysts rechargeable lithium-air batteries. In particular, the La_(0.4)Sr_(0.6)Co_(0.4)Mn_(0.6)O_3 shows a lower potential gap. When these samples are tested as catalysts for Li-air batteries at a current density of100 mA g^(-1), the discharge capacities with different La_(0.4)Sr_(0.6)Co_xMn_(1-x)O_3(x=0,0.2, 0.4) catalysts are 5819, 6420, and 7227 mA h g^(-1),respectively. In addition, under a capacity limitation of 1000 mA h g^(-1), the cell using La_(0.4)Sr_(0.6)Co_(0.4)Mn_(0.6)O_3 as catalyst shows good cycling stability up to 46 cycles. The good electrochemical performance suggests that suitable doping of Co in Mn site of La_(0.4)Sr_(0.6)MnO_3 could be a promising route to improve the catalytic activity.

Cascaded channel decoupling based solution for RIS regulation matrix

This article presents a pioneering solution to address the challenges of reconfigurable intelligent surface(RIS),employing a cascaded channel decoupling strategy.This novel method streamlines the RIS regulation matrix by dividing the process of electromagnetic wave modulation into two separate sub-processes:virtual receiving response and virtual regular transmission,resulting in the decoupling of the RIS cascaded channel.Furthermore,the paper explores the practical implementation of this channel decoupling method in two typical scenarios,including single-user and multi-user access,offering detailed insights into its application.Through numerical simulations,the article demonstrates the effectiveness and reduced complexity of the proposed scheme in enhancing the efficiency of the RIS regulation matrix.

稳定性冠心病患者发生冠状动脉三支血管病变的相关因素分析

目的分析稳定性冠心病(SCAD)患者发生三支血管病变的相关因素。方法该研究为横断面研究。收集2019年5月至2020年4月复旦大学附属中山医院诊断为SCAD的447例患者的临床资料,其中冠状动脉单支血管病变组108例,二支血管病变组136例,三支血管病变组203例。以单支和三支血管病变组为研究对象,采用单因素分析比较两组患者一般资料和生化指标的差异,并采用多因素logistic回归分析SCAD患者发生三支血管病变的相关因素。结果311例患者中,男性244例(78.5%),女性67例(21.5%);年龄57(64,69)岁。单支血管病变组与三支血管病变组SCAD患者的糖尿病史(χ^(2)=7.75,P=0.005)以及尿酸(Z=-2.10,P=0.036)、糖化血红蛋白(Z=-2.77,P=0.006)、高密度脂蛋白胆固醇(HDL-C)(Z=-2.99,P=0.003)水平差异有统计学意义。多因素分析结果显示,血尿酸(OR=1.01,95%CI:1.00~1.01,P<0.05)水平较高,HDL-C水平较低(OR=3.29,95%CI:1.23~8.85,P<0.05)是SCAD患者发生三支血管病变的相关因素。结论高血尿酸水平和低HDL-C水平是SCAD患者发生三支血管病变的相关因素。

Reconfigurable intelligent surfaces for 6G:applications,challenges,and solutions

Scholars are expected to continue enhancing the depth and breadth of theoretical research on reconfigurable intelligent surface(RIS)to provide a higher theoretical limit for RIS engineering applications.Notably,significant advancements have been achieved through both academic research breakthroughs and the promotion of engineering applications and industrialization.We provide an overview of RIS engineering applications,focusing primarily on their typical features,classifications,and deployment scenarios.Furthermore,we systematically and comprehensively analyze the challenges faced by RIS and propose potential solutions including addressing the beamforming issues through cascade channel decoupling,tackling the effects and resolutions of regulatory constraints on RIS,exploring the network-controlled mode for RIS system architecture,examining integrated channel regulation and information modulation,and investigating the use of the true time delay(TTD)mechanism for RIS.In addition,two key technical points,RIS-assisted non-orthogonal multiple access(NOMA)and RIS-based transmitter,are reviewed from the perspective of completeness.Finally,we discuss future trends and challenges in this field.

Composition optimization of inconel 718 via cluster formula and experimental verification

Superalloys feature multi-elements and complex elemental ranges,which makes the proper composition selection difficult.In fact,more strict composition standards generally apply in practical productions.The objective of this paper is to understand and eventually to renew the composition standard via example of the most common grade Inconel 718.We have recently shown that t he alloy chemistry originates from a nearest-neighbor cluster[center-shell]plus a few next-neighbor glue atoms,or expressed in cluster for-mula[center-shell](glue atoms).By grouping the elements into Ni=(Ni,Co,Cu,Fe),Cr=(Cr,Mn,Si,Mo),and Nb=(Nb,Al,Ti),it is found that the reported alloys fall within a narrow composition zone Ni_(11.0-13.0)-Cr_(3.5-4.5)-Nb_(1) confined by cluster formulas of 16 and 18 atoms.This composition zone is also expressed in terms of 288-atom supercluster formulas,Ni_(198-208)-Cr_(63-72)-Nb_(16-18),which leads to coordi-nated elemental variations in wt.%:69.0≤Ni+Co+Cu+Fe≤72.7;19.8≤Cr+Mn+1.7 Si+0.6 Mo≤22.8;8.7≤Nb+3.2 Al+1.9 Ti≤9.8.Within this composition zone,Ni_(206)-Cr_(65.5)-Nb_(16.5) is further pinpointed and validated by our own experiments to possess the optimal match of strength and plasticity both at room and at 923 K.

Mo doping provokes two electron reaction in MnO_(2)with ultrahigh capacity for aqueous zinc ion batteries

Rechargeable aqueous zinc ion batteries(AZIBs)based on manganese dioxide(MnO_(2))have received much attention for large-scale energy storage applications,however,their energy density is mainly limited by the one-electron reaction of Mn4+/Mn3+redox.Herein,Mo dopedδ-MnO_(2)(Mo-MnO_(2))is prepared and used as a high-performance cathode for AZIBs,which delivers an⇌⇌ultrahigh specific capacity of 652 mAh·g^(−1)at 0.2 A·g^(−1)based on the two-step two-electron redox reaction of Mn^(4+)Mn^(3+)Mn^(2+).Ex-situ structural analysis and density functional theory calculation reveal that the Mo^(5+)dopant plays an important role in enhancing the electronic conductivity of Mo-MnO_(2)and promoting Jahn–Teller distortion of octahedral[MnO_(6)]in ZnMn_(2)O_(4),which facilitates the second step redox reaction of Mn^(3+)/Mn_(2+).This work provides a novel cathode materials design with multi-electron redox chemistry to achieve high energy density in AZIBs.

6G移动通信网络:愿景、挑战与关键技术

随着5G网络开启规模商业部署,越来越多的研究机构及相关人员开始对下一代移动通信系统进行研究.本文将探讨10年后(2030年~)的6G概念.本文首先用4个关键词概括未来6G愿景:'智慧连接'、'深度连接'、'全息连接'和'泛在连接',而这4个关键词共同构成'一念天地,万物随心'的6G总体愿景.接着分析了实现6G愿景面临的技术需求与挑战,包括峰值吞吐量、更高能效、随时随地的连接、全新理论与技术,以及一些非技术挑战.然后分类给出了6G潜在关键技术:新频谱通信技术,包括太赫兹通信和可见光通信;基础性技术,包括稀疏理论(压缩感知)、全新信道编码、大规模天线、灵活频谱使用,以及基于AI的无线通信技术;专有技术特性,包括空天地海一体化网络和无线触觉网络.本文通过探讨6G愿景、需求与挑战,以及潜在关键技术,尝试勾勒出6G的整体框架,以期为后续展开6G研究提供方向性指引.

Laser Machined Fiber‑Based Microprobe: Application in Microscale Electroporation

Microscale electroporation devices are mostly restricted to in vitro experiments(i.e.,microchannel and microcapillary).Novel fiber-based microprobes enable in vivo microscale electroporation and arbitrarily select the cell groups of interest to electroporate.We developed a flexible,fiber-based microscale electroporation device through a thermal drawing process and femtosecond laser micromachining techniques.The fiber consists of four copper electrodes(80μm),one microfluidic channel(30μm),and has an overall diameter of 400μm.The dimensions of the exposed electrodes and channel were customizable through a delicate femtosecond laser setup.The feasibility of the fiber probe was validated through numerical simulations and in vitro experiments.Successful reversible and irreversible microscale electroporation was observed in a 3D collagen scaffold(seeded with U251 human glioma cells)using fluorescent staining.The ablation regions were estimated by performing the covariance error ellipse method and compared with the numerical simulations.The computational and experimental results of the working fiber-based microprobe suggest the feasibility of in vivo microscale electroporation in space-sensitive areas,such as the deep brain.

Multi-dimensional morphology of hydride diffusion layer and associated sequential twinning in commercial pure titanium

The dominant hydride precipitates have been well demonstrated to follow two types of orientation relationships(ORs)with Ti matrix:OR1 with{0001}//{001},<1210>//<110>and OR2 with{0001}//{111},<1210>//<110>.Within the grains with special orientations,the complicated interactions of different hydride variants inside Ti-hydride diffusion layer are characterized in this work.For OR1 hydride layer,the orientations of{1010}plane parallel to the sample surface and a-axis parallel to the normal direction prefer multiple OR1 variants.The orientations favorable for OR2 hydride layer are:{1013}plane parallel to sample surface corresponding to the layer with one OR2 variant dominated and c-axis parallel to the surface normal with multiple OR2 variant layer preferred.Furthermore,{1012}extension twins and{1122}contraction twins are activated to accommodate the OR2 hydride-induced surface expansion and local misfit strain.The stimulation of these two twins is also orientation-dependent:{1012}and{1122}twins are observed in the grains with c-axis parallel to and deviated from the surface normal,respectively.The further variant selection for each twin mode is performed through shear accommodation of hydride-twin pairs.

Aluminum Porphyrin Complex Mediated Auto-Tandem Catalysis for One-Pot Synthesis of Block Copolymers

Auto-tandem catalysis that uses a single catalyst to bridge and discriminate different catalytic cycles in a one-pot process is highly desirable for obtaining a high degree of structural complexity;however,it is a great challenge to develop auto-tandem catalytic systems in polymer chemistry.Herein,we report the auto-tandem catalysis by rationally designed aluminum porphyrin complexes,wherein well-controlled photoinduced electron/energy transfer–reversible addition-fragmentation chain transfer(PET-RAFT)polymerization of vinyl monomers and completely alternating ring-opening copolymerization(ROCOP)of epoxides/anhydrides can occur in a concurrent or sequential manner.With a carboxylic group incorporated trithiocarbonate compound bearing a carboxylic acid group(TTC-COOH)as the bifunctional chain transfer agent(CTA),the auto-tandem catalysis provides one-pot access to diblock copolymers with predictable molecular weights and narrow distributions.Notably,the efficient electron/energy transfer from 5,10,15,20-tetrakis(2-chlorophenyl)porphyrin aluminum(III)chloride[(TPP^(2-Cl))Al^(III)-Cl]to TTC-COOH and their axial group exchange reactions completely circumvent the formations of undesirable homopolymers.