Multistimuli‐Responsive Display Materials to Encrypt Differentiated Information in Bright and Dark Fields

Visually readable codes play a crucial role in anticounterfeiting measures. However, current coding approaches do not enable time‐dependent codes to be visually read, adjusted, and differentiated in bright and dark fields. Here, using a combined strategy of piezoelectric lattice selection, oxygen vacancy engineering, and activator doping, a lanthanide ion‐doped titanate is developed that integrates mechano‐, thermo‐, and photo‐responsive color change (>18 h for bright field), persistent luminescence (>6 h for dark field), and stimulus‐triggered multimodal luminescence. The feasibility of optical encoding, visual displaying, and stimulus‐responsive encrypting of time‐dependent, dual‐field information by using the developed material is demonstrated. In particular, the differentiated display of dual‐field modes is achieved by combining mechanostimulated abolition of only the persistent luminescence and thermo‐ and photostimulated reversal of both the color change and persistent luminescence. The results provide new insights for designing advanced materials and encryption technologies for photonic displays, information security, and intelligent anticounterfeiting.     

主成分分析法在火药燃烧规律分析中的应用

本文用多元统计的主成分分析法分析了火药的静态燃烧规律,证实了火药的静态燃烧参量主成分与动态弹道性能p_m、v_0、yv_0的密切相关性,利用主成分与弹道性能建立的回归公式对p_m、v_0、yv_0进行模拟,p_m模拟误差<3%,v_0模拟误差小于1%,yv_0与实测结果有较好的一致性.     

大载荷水下滑翔器运动性能研究

在大载荷水下滑翔器的平面运动数学模型基础上,通过线性化模型初步设计了LQR控制器,建立了整体Matlab/Simulink仿真模型,研究了系统的动态性能。研究结果表明,系统在初始状态向目标状态的转化过程中,在仿真初始振荡较为剧烈,随着反馈信号的对输入信号的补偿,很快趋于稳定。仿真结果有待进一步实验验证。     

Linear Study of a Large-orbit Coaxial-waveguide Cyclotron Autoresonance Maser Amplifier

A linear theory based on Maxwell-Vlasov equations and the Laplace transform is presented to describe the large-orbit coaxial-waveguide cyclotron autoresonance maser (CARM) amplifier. A 35-GHz, TE_5,1-mode large-orbit coaxial-waveguide CARM amplifier is specifically analyzed. Good agreement between the linear theory and the nonlinear simulations is found in the exponentially growing region of the wave. Results show that the operating magnetic field and the electron-beam energy and average radius substantially affect the power, and especially, a small beam current may be unsuitable to a large-orbit CARM amplifier operation.     

分离用无机膜及其在食品中的应用

概述了无机膜的种类、特点,同时介绍了无机膜在食品分离中的研究应用情况及今后的发展前景。     

基于电磁感应的钢筋定位及埋深检测新方法研究

钢筋混凝土结构广泛运用于电力基础设施中,对其内部钢筋参数进行检测能够有效判断其结构耐久性,对保障电力系统安全稳定运行有重要的意义。针对传统钢筋混凝土检测方法无法判断混凝土内钢筋走向及埋深测量不够精确的问题,通过对钢筋测量原理分析和霍尔传感器布局设计,提出了一种基于电磁感应的钢筋定位及埋深检测方法。该方法用于判断钢筋的中心位置并测量其偏转角度,同时利用拟合得到的函数反应检测值与钢筋埋深之间的关系。实验表明,埋深检测值受到相邻钢筋的影响而存在较大误差,间距越小误差越大,因此通过BP（Back propagation）神经网络对不同间距下的检测值进行了数据修正,有效地提高了混凝土中钢筋埋深的检测精度。     

Electrolyte/Structure?Dependent Cocktail Mediation Enabling High?Rate/Low?Plateau Metal Sulfide Anodes for Sodium Storage

As promising anodes for sodium-ion batteries, metal sulfides ubiquitously suffer from low-rate and high-plateau issues, greatly hindering their application in f...     

Supply Hub in Industrial Park (SHIP): The value of freight consolidation

Industrial parks, characterized as a cluster of enterprises situated in one location to share common resources, have played an indispensible role in boosting regional economic and industrial development. However, further development has been impeded by the shortage of land space, especially for the construction of warehouses. This paper proposes the concept of Supply Hub in Industrial Park (SHIP) as a promising approach addressing this challenge. SHIP is defined as a public provider of warehousing and logistics services for manufacturing enterprises located within an industrial park. The research reported in this paper focuses on evaluating the value of freight consolidation, one of the typical benefits of applying the SHIP approach. Two mathematical models of the supply chain in a typical industrial park are formulated: with and without SHIP. Genetic Algorithm (GA) is applied for solving the two models, and sensitivity experiments are conducted for comparative analysis between the two scenarios. The computational results show that through consolidating shipments, SHIP brings benefits to the whole industrial park. Total cost savings resulted from the application of SHIP would increase with the size of the supply chain, the vehicle capacity, and the rates of fixed transportation costs and holding costs of finished products at manufacturers.     

基于最优乘子潮流估计的故障筛选与排序

提出了一种用于电压稳定安全评估的快速故障筛选和排序方法。该方法从故障前的临界点出发,通过最优乘子潮流法计算得到的故障后边界点来估计故障后临界点,当初始点接近临界点,通过一次迭代即可满足所需的计算精度,从而快速地识别出非严重故障。对于严重故障和某些特殊情况的故障进行了分析并提出了解决办法,保证了对严重故障的估计精度。通过某一实际703节点系统算例验证了该方法的有效性。     

Development of High Deformability Pipeline Steel

Based on strain-based design, high deformability X70 high strength pipeline steel with dual-phase microstructure has been developed, which can be laid in the seismic, the cold or the deepwater region. The results illustrated that the developed X70 steel has the stress-strain curve like round house and it shows good anti-transformation characteristic, high uniform deformation(≥10%), enhanced n-value(≥0.10), and the low yield-tensile ratio Y/T(≤0.85). The dual-phase microstructure of ferrite and bainite conta...