New ANCF solid-beam element: relationship with Bézier volume and application on leaf spring modeling

Acta Mechanica Sinica - An eight-node solid-beam element based on absolute nodal coordinate formulation (ANCF) which uses cubic interpolation at the longitudinal direction and linear at the...     

Resilient dissipative dynamic output feedback control for uncertain Markov jump Lur’e systems with time-varying delays

The resilient dissipative dynamic output feedback control problem for a class of uncertain Markov jump Lur’e systems with piecewise homogeneous transition probabilities and time-varying delays in the discrete-time domain are examined in this study. The designed controller can tolerate additive uncertainties in the controller gain matrix, which result from controller implementations. The time-varying delays are also supposed to be mode-dependent with lower and upper bounds known a priori. By constructing a Lyapunov–Krasovskii functional candidate, the sufficient conditions regarding the existence of desired resilient dissipative controllers are obtained in terms of linear matrix inequalities, thereby ensuring that the resulting closed-loop system is stochastically stable and strictly dissipative. Two numerical examples were established to illustrate the effectiveness of the proposed theoretical results.     

In-situ growth of hybrid NaTi8O13/NaTiO2 nanoribbons on layered MXene Ti3C2 as a competitive anode for high-performance sodium-ion batteries

In the work, we successfully explore a two-step hydrothermal method for scalable synthesis of the hybrid sodium titanate (NaTi₈O₁₃/NaTiO₂) nanoribbons well in-situ formed on the multi-layered MXene Ti₃C₂ (designed as NTO/Ti₃C₂). Benefiting from the inherent structural and componential superiorities, the resulted NTO/Ti₃C₂ composite exhibits long-duration cycling stability and superior rate behaviors when evaluated as a hybrid anode for advanced SIBs, which delivers a reversible and stable capacity of ∼82 mAh/g even after 1900 cycles at 2000 mA/g for SIBs.     

LBM伪势MRT三维模型GPU并行计算的性能优化

格子Boltzmann方法伪势模型算法中的格点间计算未完全局部化，因此在并行计算时需要更多次的全局内存读写、使用更多数量的寄存器和线程同步操作，从而导致GPU并行计算效率下降.本文针对伪势模型并行计算的局限性，基于三维十五速格子结构的多松弛时间伪势模型，以气液相分离为算例，通过合并访问的方式提高全局内存的读写效率；并提出一种"定向转移"算法，提高格子边界格点获取邻居格点数据的效率；最后探索不同资源分配中各种因素对计算效率的影响，总结最优资源分配的方法.     

纳米流体辐射特性理论分析与实验研究

随着人类社会的飞速发展，能源紧缺、环境污染问题日益严重。当下，开发新能源、发展新能源技术已成为全球各国首要能源策略。作为一种清洁能源，太阳能蕴藏着巨大能量，太阳能利用和相关技术在世界范围内也引起了广泛关注。基于纳米流体的太阳能直接吸收式集热装置能够耦合光伏与光热技术，有利于提高太阳能综合利用的效率。由于纳米流体辐射理论对于开发新的光伏热实验平台具有重要的作用，而纳米流体辐射特性研究仍处于起步阶段，所以对于纳米流体辐射规律及机理的研究具有重要的意义。首先综述了纳米流体辐射特性的研究现状，并对纳米流体的辐射特性进行了理论研究，进而采用瑞利散射模型和Mie(米氏)模型对纳米流体最重要的辐射特性之一的透射率进行了理论分析；而后运用实验进行对比验证，分析不同理论模型与实验数据间的吻合性。结果表明：Mie模型比瑞利散射模型更加准确，在光伏热实验平台开发利用中具有更好的适用性。该研究旨在利用纳米颗粒改变流体对太阳能的辐射特性，探索一种实际设计时纳米流体辐射特性简易高效的计算准则，并得到影响纳米流体辐射特性的重要因素之一的体积分数的变化规律，从而提高太阳能直接吸收式集热装置的太阳能利用率。纳米流体辐射特性理论的分析与研究，有利于促进纳米技术在太阳能领域的应用，提高太阳能的综合利用效率。     

Solubility Calculations of Methane and Ethane in Aqueous Electrolyte Solutions

Journal of Solution Chemistry - Accurate calculation of light hydrocarbon solubilities in aqueous electrolyte solutions is critical for petroleum and geochemical applications. However, very few...     

螺旋管内高压汽水两相流动沸腾干涸点的研究

在较宽的实验参数范围内(系统压力P=8～15 MPa,质量流速G=800～1800 kg·m~(-2)·s~(-1),壁面热流密度q_w=200～950 kW·m~(-2))对一立式螺旋管内(管内径为10 mm,螺旋直径为300 mm,节距为50 mm)汽水两相流动沸腾干涸特性进行了实验研究。通过研究,获得了干涸发生时螺旋管圈壁温的分布特征以及压力、质量流速和壁面热流密度这三个参数对临界干度的影响规律。同时在实验数据的基础上,提出了一个适用于计算螺旋管内高压高含汽率工况下汽水两相流临界干度的经验关系式。