Plasmon-Assisted Self-Encrypted All-Optical Memory

All-optical responsive nanomaterials, which can rapidly switch between two stable states, have been regarded as the next-generation memories due to their potential to realize binary information storage and implement on-chip, integrated photonic neuromorphic systems. Rare earth oxides are preeminent candidates owing to their extraordinary luminescent stability and narrow optical transitions. However, due to the lack of simple and effective optical switches, it is difficult to realize all-optical data storage, encoding, and retrieval by pure rare earth-doped luminescent nanoparticles. Here, a rapid and high-contrast of 10⁴ luminescent switching of Y₂O₃:Eu³⁺ nanoparticle between the enhancement and quenching states is achieved by employing the strong light confinement and ultrafast thermal response of localized surface plasmon resonance. A self-encrypted all-optical memory is presented with optical information writing, encryption, reading, and re-writing, and a high-sensitivity synaptic response of emitters to frequency and light intensity flux, which can be harnessed to encrypt information flows and promote convenient and high-security information encryption. Such a convenient and secure plasmonic thermally assisted self-encrypting luminescent switch paves the way for constructing high-performance stimuli-responsive rare earth oxide crystals on demand and expanding their applications in various data encryption, anti-counterfeiting, and rewritable colouration devices.     

淬火速率对汽车用高强铝合金性能的影响

采用力学性能测试、电导率测试和透射电子显微镜研究了淬火速率对汽车用高强铝合金性能的影响。结果表明：淬火速率从960℃/s降低到1.8℃/s,电导率提高了5.7% IACS,硬度的下降率为40%,抗拉强度和屈服强度的下降率分别为24.2%和56.9%,硬度和强度与淬火速率的对数呈线性关系。随着淬火速率的降低,淬火析出相的尺寸和面积分数显著增大,导致性能下降。淬火速率为1.8℃/s时,淬火析出相的平均尺寸为465.6 nm×158.2 nm,析出相的面积分数为42.1%。     

竹红菌乙素对人红细胞膜蛋白荧光猝灭机理的研究

本文利用人红细胞膜蛋白内源荧光(主要指色氨酸),经加入不同的竹红菌乙素之后,引起了荧光猝灭现象,根据荧光猝灭原理分别从吸收光谱,荧光光谱,稳态变温实验和瞬态荧光等技术分析了上述的猝灭过程,实验证明:该猝灭是以动态碰撞过程为主要作用机理,据此作者提出了乙素可以用于生物膜体系的蛋白质荧光猝灭剂的理由。     

大型塑料模具钢模块淬火工艺的有限元分析

采用有限元软件MSC Marc模拟大型P20钢模块在复杂淬火工艺下的冷却过程,通过分析淬火过程中的温度变化历程及最终组织分布,为厂方生产的P20钢模块制定合理的淬火工艺.     

稀土系贮氢合金的快淬及退火研究进展

快淬及退火对贮氢合金的组织和电化学性能影响很大.详细综述了近年来稀土系贮氢合金的各种快淬和退火工艺,以及不同工艺对合金电化学性能和组织的影响,旨在为提高贮氢合金的电化学性能提供思路和依据.     

利用铽与钙调素的荧光熄灭作用测定精锌中镉

研究了Cd2+对铽离子与钙调素(CaM)所形成的配合物(Tb43+.CaM)的荧光熄灭作用,考察了常见金属离子的干扰情况,在pH=5.0的六次亚甲基四胺缓冲溶液中,不断通入N2作保护气体可防止O2对Tb43+.CaM荧光的熄灭作用。由此建立了测定Cd2+的新方法,Cd2+浓度在0.0723~15.80μg/mL范围内与荧光熄灭值ΔIF具有良好的线性关系,检测下限为0.044μg/mL,相对标准偏差为5.1%。用该方法测定了精锌中镉的含量,平均回收率为96.1%。     

Quenching of self-excited vibrations

Stable normal-mode vibrations in engineering can be undesirable and one of the possibilities for quenching these is by embedding the oscillator in an autoparametric system by coupling to a damped oscillator. There exists the possibility of destabilizing the undesirable vibrations by a suitable tuning and choice of nonlinear coupling parameters. An additional feature is that, to make the quenching effective in the case of relaxation oscillations, one also has to deform the slow manifold by choosing appropriate coupling; this is illustrated for Rayleigh and van der Pol relaxation.     

A novel red long lasting phosphorescent (LLP) material β-Zn3(PO4)2:Mn, Sm

A novel red long lasting phosphorescent materials β-Zn₃(PO₄)₂:Mn²⁺,Sm³⁺ is firstly synthesized by high-temperature solid-state reaction. The influence of Sm³⁺ ions on luminescence and long lasting phosphorescence properties of Mn²⁺ in phosphor β-Zn₃(PO₄)₂:Mn²⁺,Sm³⁺ are systematically investigated. It is found that the red phosphorescence (λ = 616 nm) performance of Mn²⁺ ion such as brightness and duration is largely improved when Sm³⁺ ion is co-doped into the matrix in which Mn²⁺ ion acts as luminescent center and Sm³⁺ ion plays an important role of electron trap. Thermoluminescence spectrums show that there exists one peak in β-Zn₃(PO₄)₂:Mn²⁺,Sm³⁺, the depth of which is 0.33 eV, and that there are three peaks in β-Zn₃(PO₄)₂:Mn²⁺, among which the depth of the lowest temperature peak in β-Zn₃(PO₄)₂:Mn²⁺ is 0.37 eV. Such differences in the trap depth result in the improvement of red long lasting phosphorescence of Mn²⁺ in present matrix.