环氧聚酯美术型粉末涂料及其防腐性能试验研究

通过多年来的批量生产实践,阐述了环氧聚酯美术粉末涂料的组成及其对原材料的要求和在电子测量仪器表面装饰的应用;并介绍其涂覆层经人工加速试验耐盐雾试验和耐湿热试验的结果,以及在各种气候条件下,经一年的天然暴露试验结果。     

Microstrip dual-band bandstop filter of defected ground structure and stepped impedance resonators

This article presents a compact microstrip dual-band bandstop filter (BSF), in which one λ_g/4 defected ground structure (DGS) pair is utilised to realise one stopband while two stepped impedance resonators (SIRs) help obtain another stopband and suppress the spurious harmonics. The design strategies and the equivalent circuits are introduced in detail. The measured results indicate 43.8% and 18.7% fractional bandwidth in the two stopbands (2.4 GHZ and 5.2 GHz) respectively, and the return loss is greater than 15 dB in the whole passband. In addition, size reduction can be conveniently achieved by adjusting the length of the SIRs and DGS.     

基于PLZT开关的全光纤单模调Q掺Yb3+光纤激光器

PLZT电光陶瓷具有良好的透明性、高电光系数等特性,用来实现全光纤调Q开关具有很大的优势.分析了PLZT全光纤调Q开关的原理,测量了调Q开关的时间波形,研究了基于PLZT开关的全光纤单模环形调Q掺Yb3 光纤激光器.抽运光功率为180 mW,莆复频率为1 kHz时,得到峰值功率25.6 W,脉冲宽度80 ns,光谱宽度1 nm,脉冲能量2.0 μJ的调Q脉冲.此外,分别研究了抽运功率和重复频率对脉冲峰值功率和脉冲宽度的影响,结果表明,同一重复频率情形下,随着抽运功率的升高,峰值功率增大,脉冲宽度降低;同一抽运功率水平下,随着重复频率的增大,脉冲的峰值功率减小,脉冲宽度增大.     

一种应急管理信息系统在海油企业中的应用

本文主要介绍一套适合海油企业实际业务应用的应急管理信息系统,系统通过模块化、组件化模式实现灵活应用配置,并可根据用户实际应用需求进行模块组合、拆解,为不同领域的企业和厂区搭建适用的定制化应用系统,满足企业日常安全应急管理需求,为应急指挥工作提供辅助决策支持。     

LS-DSP中串行分布式数字滤波器的功耗优化设计

采用一种优化阶符的二进制数据表示方法,达到了减小LS-DSP内串行分布式计算滤波器的动态功耗的目的.实验结果表明,该方法可有效减小LS-DSP内串行分布式计算滤波器10%的动态功耗.     

Direct View on the Origin of High Li+ Transfer Impedance in All-Solid-State Battery

Large interfacial resistance plays a dominant role in the performance of all-solid-state lithium-ion batteries. However, the mechanism of interfacial resistance has been under debate. Here, the Li⁺ transport at the interfacial region is investigated to reveal the origin of the high Li⁺ transfer impedance in a LiCoO₂(LCO)/LiPON/Pt all-solid-state battery. Both an unexpected nanocrystalline layer and a structurally disordered transition layer are discovered to be inherent to the LCO/LiPON interface. Under electrochemical conditions, the nanocrystalline layer with insufficient electrochemical stability leads to the introduction of voids during electrochemical cycles, which is the origin of the high Li⁺ transfer impedance at solid electrolyte-electrode interfaces. In addition, at relatively low temperatures, the oxygen vacancies migration in the transition layer results in the formation of Co₃O₄ nanocrystalline layer with nanovoids, which contributes to the high Li⁺ transfer impedance. This work sheds light on the mechanism for the high interfacial resistance and promotes overcoming the interfacial issues in all-solid-state batteries.     

Finite-Sized Atom Reconstruction Enhanced High-Frequency Multi-Domain Magnetic Response

The technological advances in wearable electronics and military stealth have spawned extensive research into electromagnetic wave absorbents. Despite the rapid progress in the geometrical modulation of magnetic absorbents, the engineering strategy of microwave-responsive magnetic domains is underdeveloped and the response dynamics remain unclear. Herein, a surface finite-sized atom reconstruction procedure is proposed to accurately modulate the local magnetic topological domains, dramatically enhancing the magnetic loss capacity. Due to the selectivity of atom reconstruction, vortex and stripe domains are controllably hybridized around the porous surface to broaden the interactive domain region, significantly intensifying energy absorption of the microwave field. Meanwhile, the amorphous/crystalline interfaces around atom reconstruction regions can induce interfacial polarization, enabling the optimization of dielectric loss capacity. Therefore, a satisfactory magnetic–dielectric synergy is realized to demonstrate the strong absorption intensity of −31.2 dB and the broad absorption bandwidth of 5.9 GHz. Furthermore, the surface-based magnetic domain transformation and microwave energy attenuation mechanisms are thoroughly revealed to break the black box of structure–function through electron holography and micromagnetic simulation. These achievements demonstrate a promising solution to improve high-frequency magnetic properties and provide a feasible route to interpret the structure-relevant magnetic loss capacity.     

976 nm高效率半导体激光器

976 nm高效率半导体激光器是这几年研究的热点,在固体激光器泵浦领域有广阔的应用。通过优化半导体激光器材料外延结构中包覆层和波导层的铝组分,降低了工作电压;通过采用微通道水冷系统,并进行优化降低了热阻,从而提高了室温下的电光转换效率。25℃室温连续测试条件下,1 cm的线阵列(巴条),2 mm腔长,50%填充因子,在110 A下,出光功率为114.2 W,电压为1.46 V,电光转换效率为71%。15条微通道封装成的垂直叠阵,进行光束整形后,获得了室温976 nm连续输出功率1 500 W,电光转换效率大于70%。     

基于数字温度传感器TMP100的超低功耗射弹药温计设计

结合射弹发射药温度测量的实际需求,设计了超低功耗射弹药温计,给出了系统结构框图和软件流程,介绍了数字温度传感器TMP100和8引脚微控器PIC12F629,给出PIC12F629对TMP100的控制和数据读取过程,并介绍了系统的硬软件超低功耗设计.