Effects of heat treatment and SOC on fire behaviors of lithium-ion batteries pack

Journal of Thermal Analysis and Calorimetry - Numerous lithium-ion battery fire accidents raise comprehensive safety concerns in modern society. In this paper, an experimental study was conducted...     

A High-Yield and Cost-Effective Synthesis of Spirotetramat

Russian Journal of Organic Chemistry - cis-8-Methoxy-1,3-diazaspiro[4.5]decane-2,4-dione, the key intermediate in the synthesis of spirotetramat, was synthesized by catalytic hydrogenation,...     

From β-Na2B6O10 to Na3AlB8O15 and Na3Al2B7O15: Structural Tuning of Anionic-Group Architectures by Substitution of [BO4] by [AlO4] Covalent Tetrahedra

Two new sodium aluminum borates, Na₃AlB₈O₁₅ and Na₃Al₂B₇O₁₅, have been successfully synthesized by the high-temperature solution method. They crystallize in the different space groups, P2₁/c and P2/c, respectively. The B−O configurations of β-Na₂B₆O₁₀, Na₃AlB₈O₁₅ and Na₃Al₂B₇O₁₅ are compared to feature complicated different dimensional open-framework structures caused by the substitution of [BO₄] by [AlO₄] covalent tetrahedra. Moreover, the experimental results indicate that Na₃AlB₈O₁₅ and Na₃Al₂B₇O₁₅ have short ultraviolet (UV) cutoff edges (<187 nm). The first-principles calculations show that Na₃AlB₈O₁₅ and Na₃Al₂B₇O₁₅ have moderate birefringence (0.075 and 0.041@1064 nm, respectively).     

Experimental study of reduced pressure effect on radiation feedback to the fuel surface of pool fires

Journal of Thermal Analysis and Calorimetry - To investigate low air pressure effect on the flame radiative feedback to the fuel surface, pool fires with stable liquid surface were performed by...     

二氟甲基自由基反应及其在18F标记中的应用

随着正电子发射断层扫描(PET)技术的进步, 高效¹⁸F标记反应显现出重大的研究价值. 同时, 在有机氟化学的快速发展下, 研究人员已开发出一系列产生二氟甲基自由基(·CHF₂)的一碳合成子, 得以被引入到¹⁸F标记反应中. 本文从化学原理出发, 总结了近年来·CHF₂合成子、 碳氢键活化反应及¹⁸F标记的研究, 并展望了未来的研究趋势.     

Nonlinear switching and solitons in PT‐symmetric photonic systems

One of the challenges of the modern photonics is to develop all‐optical devices enabling increased speed and energy efficiency for transmitting and processing information on an optical chip. It is believed that the recently suggested Parity‐Time (PT) symmetric photonic systems with alternating regions of gain and loss can bring novel functionalities. In such systems, losses are as important as gain and, depending on the structural parameters, gain compensates losses. Generally, PT systems demonstrate nontrivial non‐conservative wave interactions and phase transitions, which can be employed for signal filtering and switching, opening new prospects for active control of light. In this review, we discuss a broad range of problems involving nonlinear PT‐symmetric photonic systems with an intensity‐dependent refractive index. Nonlinearity in such PT symmetric systems provides a basis for many effects such as the formation of localized modes, nonlinearly‐induced PT‐symmetry breaking, and all‐optical switching. Nonlinear PT‐symmetric systems can serve as powerful building blocks for the development of novel photonic devices targeting an active light control.

     

聚{11-[(4'-正庚氧基-4-联苯基)羰基]氧-1-十一炔}的相结构与相转变

采用示差扫描量热法(DSC)、一维(1D)、二维(2D)广角X-射线衍射(WAXD)和偏光显微镜(PLM)等研究手段对聚{11-[(4'-正庚氧基-4-联苯基)羰基]氧-1-十一炔}(PA-9,7)的本体相转变和相结构进行研究,并采用分子动力学方法对相结构进行模拟.结果表明,样品的相转变为近晶B相(SmB)(→)近晶A相(SmA)(→)各向同性态(Iso).在近晶B相中,侧链在层状结构中排列成具有六次对称性的准长程有序结构.     

Highly active electrocatalytic CO2 reduction with manganese N-heterocyclic carbene pincer by para electronic tuning

Electronic tuning by para substitutions was explored to achieve a highly active manganese N-heterocyclic carbene pincer complex for the selective electrocatalytic reduction of CO₂ to CO. [MnCNC^OMe]BF₄（L2-Mn） bearing an electron-donating group（–OMe） showed high activity with 63 × catalytic current enhancement, average Faradaic efficiency of 104%, and a TOF_max value of 26,127 s^-1, which is 127 times higher than that of unsubstituted [MnCNC     

半潜式海上浮式风机气动阻尼特性研究

由于海上漂浮式风机具有较大的支撑平台运动,气动阻尼效应对海上漂浮式风机的运动响应带来了重要的影响, 日渐受到相关国内外学者的关注. 为了研究海上浮式风机的气动阻尼特性,本文推导了海上浮式风机气动阻尼力的数学模型,并借助模型实验和数值计算的方法,研究了半潜式海上浮式风机的气动阻尼特性及其作用规律. 结果表明,浮式风机的风轮旋转时的气动阻尼比风轮非旋转状态时更加明显;在作业工况下,气动阻尼对半潜式浮式风机平台的纵荡、纵摇、机舱的运动有明显的抑制作用,且主要体现为对半潜式浮式风机的平台运动固有频率响应的抑制作用,对波频范围的平台运动作用甚微. 其变化规律与风速大小、波浪载荷等有关,在风机的额定工况之前,气动阻尼通常与风速呈正相关关系,但是增长率有逐渐减小的趋势;在控制系统作用下,当入流风速接近或超过风机额定风速时,容易出现气动负阻尼现象,反而进一步强化浮式风机的运动响应,此时通过降低变桨距控制器的比例系数,即降低变桨距控制器的灵敏度,有助于增加海上浮式风机的气动阻尼效果,并且在一定程度上减缓负的气动阻尼的发生,改善海上浮式风机的运动响应.      

含硒表界面化学

硒是人体必需的一种微量元素, 本课题组近年的研究表明含硒化学键具有诸多独特的化学性质. 二硒键具有氧化还原双重响应性, 同时是一类光响应的动态共价键, 能够在可见光辐照下发生可逆的交换反应. 将含硒化学键这些独特的性质与表界面化学相结合可以赋予体系独特的响应行为. 本文综合评述了本课题组近年来在含硒表界面化学领域的研究进展: 采用单分子力谱揭示了含硒化学键相互作用的力学规律; 通过表界面化学实现了二硒键动态平衡的调控; 基于二硒键氧化还原及可见光响应性实现了表界面可逆修饰、 二维材料功能化及层层组装膜材料的制备, 在生物医用、 液体输运等领域具有潜在应用价值.