正仲氢催化转化性能低温测试装置设计

液氢在新能源、工业生产等领域有重要的用途.结合液氢生产中正仲氢转化的特点,提出了一种可实现多种转化方式的正仲氢催化转化性能低温测试装置设计.通过液氮预冷和G-M制冷机实现正仲氢转化温度可控、通过设置正仲氢预反应实现入口原料仲氢组分可控,并采用更换可拆卸转化器和热沉方式实现多种正仲氢转化方式.实现不同工况下(等温绝热、连...     

参数未知神经元模型的全阶与降阶最优同步

基于Lyapunov稳定性理论、最优控制原理以及分步设计方法, 为神经元系统设计了非线性反馈控制器和最优控制器. 其中非线性反馈控制器能使得两个神经元系统之间的轨道误差趋于零, 最优控制器使得在同步过程中所花费的能量达到最低. 本文以Cable模型为例, 实现了两个神经元模型的全阶最优同步; 以Cable 模型和Hindmarsh-Rose (HR)模型为例, 实现了两个神经元模型的降阶最优同步; 同时, 均能有效地辨识出系统参数. 最后通过数值模拟进一步验证了本方案的有效性.     

铯原子气室中相干布居俘获的参数依赖关系研究

基于铯原子基态6S_1/2的两个超精细能级（F=3与F=4）与激发态6P_3/2的超精细能级（F′=4）构成的Λ型三能级系统,采用室温下的未充缓冲气体和充有分压为266.6 Pa的氖气作为缓冲气体的铯原子气室对于相干布居俘获（CPT）的参数依赖关系进行了实验研究和理论分析.主要研究了CPT信号的半高全宽和幅度对于频率差为铯原子基态6S_1/2的超精细分裂（9.19263177 GHz）且位相锁定的两激光束的功率、光强比值、光斑直径、磁屏蔽之后的剩余磁场以及是否充缓冲气体等实验参数的依赖关系.在优化的实验参数条件下获得了约340 Hz的CPT信号半高全宽.     

Widely and continuously tunable optical parametric generator infrared laser

The experimental results of a high efficiency infrared laser are demonstrated on a quasi phase matched optical parametric generator in PPMgLN (5% MgO doping) pumped by a 1064 nm Nd:YAG laser. A broad continuous signal spectrum 1.56?C1.67 ??m are obtained by tuning the crystal temperature from 20°C to 200°C. When the average pump power is 1.82 W with about 70 ns pulse duration operating at a repetition rate of 10 kHz, the maximum total output power of the PPMgLN OPG is about 323.58 mW consisting of 210 mW of 1.639 ??m signal radiation and 113.58 mW of 3.02 ??m idler radiation.     

7075铝合金扭转复合微动磨损研究

基于低速往复回转系统,通过改变回转系统旋转轴的倾斜角α,成功实现了球/平面接触状态下扭动微动和转动微动的复合,并研究了7075铝合金/GCr15钢球在倾斜角10°和40°及不同角位移幅值下的扭转复合微动行为.在动力学分析基础上,结合光学显微镜(OM)、扫描电子显微镜(SEM)、X射线能谱仪(EDX)、表面轮廓仪等手段分析了扭转复合微动运行行为及损伤机理.结果表明:7075铝合金的扭转复合微动的运行和损伤行为强烈依赖于倾斜角和角位移幅值;随着倾斜角的增加,扭动微动分量减少,转动微动分量增加,复合微动的混合区和滑移区向小角位移方向移动,损伤形貌的非对称性增加,同时磨损机制从剥层和氧化磨损逐渐转变为磨粒磨损和氧化磨损.     

原位制备SrSb2O6/g-C3N4新型二维异质结用于可见光催化降解四环素的研究

本文采用高温固相原位制备新型二维SrSb2O6/g-C3N4异质结光催化复合材料,并将其用于可见光催化降解四环素.通过XRD和FT-IR谱对其结构进行表征.光催化降解实验表明,异质结复合材料较母体g-C3N4和SrSb2O6而言,光催化效率均得到了提升.其中,异质结样品SSO-CN-2对四环素溶液具有最优的光催化降解效...     

ZnF2-Riched Inorganic/Organic Hybrid SEI: in situ-Chemical Construction and Performance-Improving Mechanism for Aqueous Zinc-ion Batteries

Uncontrolled dendrites growth and serious parasitic reactions in aqueous electrolytes, greatly hinder the practical application of aqueous zinc-ion battery. On the basis of in situ-chemical construction and performance-improving mechanism, multifunctional fluoroethylene carbonate (FEC) is introduced into aqueous electrolyte to construct a high-quality and ZnF₂-riched inorganic/organic hybrid SEI (ZHS) layer on Zn metal anode (ZMA) surface. Notably, FEC additive can regulate the solvated structure of Zn²⁺ to reduce H₂O molecules reactivity. Additionally, the ZHS layer with strong Zn²⁺ affinity can avoid dendrites formation and hinder the direct contact between the electrolyte and anode. Therefore, the dendrites growth, Zn corrosion, and H₂ evolution reaction on ZMA in FEC-included ZnSO₄ electrolyte are highly suppressed. Thus, ZMA in such electrolyte realize a long cycle life over 1000 h and deliver a stable coulombic efficiency of 99.1 % after 500 cycles.     

Detachable Porous Organic Polymers Responsive to Light and Heat

Stimuli-responsive porous materials have captured much attention due to the on-demand tunable properties. Most reported stimuli-responsive porous materials are based on molecule isomerism or host-guest interaction, and it is highly desired to develop new types based on different responsive mechanism. Herein, inspired by natural cells which have the ability to fuse and divide induced by external stimulation, we report a new type of stimuli-responsive porous material based on detachment mechanism. A detachable porous organic polymer, namely DT-POP-1, is fabricated from the polymerization of anthracene-containing monomer (AnMon) when irradiated by 365 nm UV light. DT-POP-1 can detach into the monomer AnMon when irradiated with 275 nm UV light or heat. Such polymerization/detachment is reversible. The detachment results in a big difference in porosity and adsorption capacity, making the present detachable porous polymer highly promising in adsorptive separation and drug delivery.