Reversible Deposition of Lithium Particles Enabled by Ultraconformal and Stretchable Graphene Film for Lithium Metal Batteries

Originating from inhomogeneous Li deposition and dissolution, the formation of dendritic and/or dead Li lies as a fundamental barrier to the practical implementation of Li metal anodes for high-energy Li-ion batteries. Here, an ultraconformal and stretchable solid-electrolyte interphase (SEI) composed of parallelly stacked few-layer defect-free graphene nanosheets, which can deform to remain ultraconformal during the expansion and shrinkage of micro-sized Li metal particles is reported. The shape-adaptive graphene protective skin is prepared via a facile mechanical method followed by Li stripping, which enables fast Li-ion diffusion, and inhibits Li dendrites and Li pulverization. The interlayer slips and wrinkles of the graphene film endow the robust protective skin with high stretchability. This work represents a unique strategy of building ultraconformal and stretchable 2D-materials-based protective skins on the surface of Li metal toward high-energy, long-life, and safe Li metal batteries.     

低秩约束的非线性属性选择算法

针对高维的数据中往往存在非线性、低秩形式和属性冗余等问题,提出一种基于核函数的属性自表达无监督属性选择算法——低秩约束的非线性属性选择算法（LRNFS）。首先,将每一维的属性映射到高维的核空间上,通过核空间上的线性属性选择去实现低维空间上的非线性属性选择;然后,对自表达形式引入偏差项并对系数矩阵进行低秩与稀疏处理;最后,引入核矩阵的系数向量的稀疏正则化因子来实现属性选择。所提算法中用核矩阵来体现其非线性关系,低秩考虑数据的全局信息进行子空间学习,自表达形式确定属性的重要程度。实验结果表明,相比于基于重新调整的线性平方回归（RLSR）半监督特征选择算法,所提算法进行属性选择之后作分类的准确率提升了2.34%。所提算法解决了数据在低维特征空间上线性不可分的问题,提升了属性选择的准确率。     

影响真空永磁过滤机过滤效果的主要因素

以ＴＣＷ １２ 型真空永磁过滤机为例,分析指出磁滤机筒体表面的磁场强度、磁系位置及筒体转速对生产能力有很大影响;真空度和滤布性能对滤饼水分有较大影响,而在一定范围内筒体转速对滤饼水分的影响较小。     

海安凹陷古近系沉积层序及对油气藏的控制

通过岩心、测井、地震以及分析化验等资料,本文对苏北盆地海安凹陷古近系进行了层序地层分析以及沉积相识别,进而研究了层序沉积体系的分布配置关系,揭示了主要油气藏分布规律。研究认为,从古近系泰州组到三垛组的盆地断陷阶段,海安凹陷经历了仪征、吴堡、真武和三垛等四次较大的构造抬升运动,形成了3个二级层序,在二级层序格架内可分为7个三级层序、17个体系域,其中主要的含油体系域包括SQ1-1低位体系域、SQ1-2低位体系域、SQ1-3高位体系域、SQ2-1湖侵体系域及SQ3-1低位体系域等;主要含油体系域发育的沉积相类型主要有扇三角洲、河流三角洲、辫状河三角洲以及湖相等;层序地层格架内体系域的沉积特征及空间位置的差异形成了不同的有利生储盖配置:SQ1-1低位体系域生储盖组合、SQ1-2低位体系域生储盖组合、SQ1-3高位体系域生储盖组合、SQ2-1湖侵体系域生储盖组合、SQ3-1低位体系域生储盖组合等。     

虚拟企业—21世纪最具竞争力的企业模式

虚拟企业是随着信息技术和市场竞争的发展而产生的,它是企业间为提高市场竞争力获得更多利润而采取的一种有效组合方式,这种组合经营方式给我国的企业改革和发展提供了很好的借鉴意义。     

椭圆球面波信号Wigner-Ville分布显式渐近求解方法

针对现有的椭圆球面波函数(PSWFs)信号时频分析无显式表达式、数值仿真误差不可控、时频分布结果对称性缺失等问题,该文引入Legendre多项式以及Wigner-Ville分布(WVD),提出一种PSWFs信号WVD显式渐近求解方法。该方法根据误差要求,生成所需阶数的Legendre多项式WVD自项、交叉项,进而与对应的WVDLegendre系数相乘后线性叠加,获取PSWFs信号WVD显式渐近表达式。理论及数值仿真结果表明,所提方法能够产生满足误差要求的PSWFs信号WVD显式渐近表达式,且能够有效保持信号原有的时域、频域对称性。此外,在相同采样点数情况下,相对于基于数值解的PSWFs信号WVD,所提方法获得的PSWFs信号WVD频域分辨率更高。     

A hybrid nested partitions algorithm for scheduling flexible resource in flow shop problem

Production scheduling with flexible resources is critical and challenging in many modern manufacturing firms. This paper applies the nested partitions (NP) framework to solve the flexible resource flow shop scheduling (FRFS) problem using an efficient hybrid NP algorithm. By considering the domain knowledge, the ordinal optimisation principle and the NEH heuristics are integrated into the partitioning scheme to search the feasible region. An efficient resource-allocation procedure is built into the sampling scheme for the FRFS problem. A large number of benchmark examples with flexible resources are tested. The test results show that the hybrid NP algorithm is more efficient than either generic NP or heuristics alone. The algorithm developed in this study is capable of selecting the most promising region for a manufacturing system with a high degree of accuracy. The algorithm is efficient and scalable for large-scale problems.     

Efficient Solar Energy Harvesting and Storage through a Robust Photocatalyst Driving Reversible Redox Reactions

Simultaneous solar energy conversion and storage is receiving increasing interest for better utilization of the abundant yet intermittently available sunlight. Photoelectrodes driving nonspontaneous reversible redox reactions in solar‐powered redox cells (SPRCs), which can deliver energy via the corresponding reverse reactions, present a cost‐effective and promising approach for direct solar energy harvesting and storage. However, the lack of photoelectrodes having both high conversion efficiency and high durability becomes a bottleneck that hampers practical applications of SPRCs. Here, it is shown that a WO₃‐decorated BiVO₄ photoanode, without the need of extra electrocatalysts, can enable a single‐photocatalyst‐driven SPRC with a solar‐to‐output energy conversion efficiency as high as 1.25%. This SPRC presents stable performance over 20 solar energy storage/delivery cycles. The high efficiency and stability are attributed to the rapid redox reactions, the well‐matched energy level, and the efficient light harvesting and charge separation of the prepared BiVO₄. This demonstrated device system represents a potential alternative toward the development of low‐cost, durable, and easy‐to‐implement solar energy technologies.