Experimental study of interband and intraband crosstalk in WDM networks

The impacts of interband and intraband erosstalk are studied and compared experimentally. Results show that interband crosstalk can be removed with narrow-band filters and has no influence on signal. Intraband crosstalk will result in signal eye diagram close and BER increasing. When the polarization states of signal and crosstalk align, intraband crosstalk seriously decreases signal quality. But when they misalign, it has little influence. Coherent and incoherent crosstalk are studied experimentally. Results show that coherent crosstalk is less harmful to system performance than incoherent crosstalk.     

下一代光传送网的保护和恢复策略研究

随着网状网(Mesh)拓扑结构在下一代光传送网中的应用,基于Mesh的光传送网的生存性将成为研究热点。文章从光层生存性入手,首先分析Mesh生存性的主要特征,接着对Mesh网的保护与恢复策略进行归纳和总结,并介绍不同保护机制的应用特点,最后对Mesh网中的多层联合保护策略作了较为深入的探讨。     

Mechanochromic Photonic Vitrimer Thermal Management Device Based on Dynamic Covalent Bond

Flexible self-healing thermal management devices are increasingly in demand due to their high flexibility, low driving voltage, and excellent stability of thermal property. In this paper, the design of mechanochromic self-healing thermal management devices is reported based on photonic vitrimer through self-healing dynamic covalent bond. A series of new photonic vitrimers i first prepared by dynamic disulfide covalent bond and PS@SiO₂ photonic crystals. The resulting photonic vitrimer exhibits bright structural colors, large tensile strain (>1000%), high mechanical strength (>10 MPa) and self-healing ability (>95% efficiency). More importantly, the structural color remains constant after 10000 stretching/releasing cycles, demonstrating excellent mechanical stability, creep-resistance, and durability. Taking advantage of the above features, a novel mechanochromic flexible wireless thermal management (MFW) device is developed by semi-embedding the photonic vitrimer in a thermally conductive carbon nanotube film and then integrating it with a Bluetooth module and a control chip. Interestingly, the MFW device exhibits mechanochromic property, fast thermal response, low driving voltage (103 °C, at 3 V), and precise temperature control. Notably, the device even remains electrothermal performance (105 °C) after self-healing. This work provides new insight into the self-healing photonic materials, and the device shows promising applications in wearable electronics, vitro physiotherapy, and personal heating.     

适于自动绕簧机的床用钢丝生产工艺

选用优质盘条,按含碳量分组投料,经铅浴处理后拉制成所需的床用弹簧钢丝,通条性能均匀,线盘平整度好。这样的钢丝在自动绕簧机上绕制性能好,材料消耗低,生产效率高,绕制弹簧的质量好     

近场MVDR聚焦波束形成被动定位方法

该文系统地研究了最小方差信号无畸变响应（MVDR）聚焦波束形成方法的定位性能,特别是对该方法定位性能受某个参数的影响情况进行了较详细的研究。首先分析了近场情况下线列阵接收信号的模型,然后分别推导了常规聚焦波束形成和MVDR聚焦波束形成的定位原理。仿真比较了这两种定位方法的定位性能,以及MVDR聚焦波束形成被动定位方法在不同的阵元间距和不同的目标距离情况下的定位性能。仿真结果表明,与常规聚焦波束形成相比,MVDR近场聚焦波束形成在提高分辨率的同时,减小了＂混叠＂影响,具有更为平滑的背景和更低的旁瓣级,同时认为,为了得到比较好的定位效果,目标应处于相对于＂近场＂的位置,从而为目标精确定位提供依据。     

导弹仿真系统可信度评估的层次分析法

利用层次分析法对导弹仿真系统进行了可信度评估，不仅给出了可信度评估的方法，而且得到客观、量化的可信度结果．为仿真用户提供了科学的决策依据，也进一步完善了导弹武器仿真系统VV＆A工作。     

导弹改进、改型中的飞行力学问题

讨论了导弹飞行性能与作战效能的关系; 介绍了国内外导弹改装、改进、改型中可能遇到的10个方面的飞行力学问题, 即发射动力学问题, 弹道问题, 增加射程(增程)问题, 末端攻击问题, 子弹头抛撒问题, 航迹规划问题, 改变飞行高度(变高)问题, 改变飞行速度(变速)问题, 改变导弹外形(变形)问题, 协同作战问题, 并进行了简短的讨论.     

对引进离子注入机损坏部件进行国产化替换的尝试

国内引进了不少离子注入机,维修问题日渐重要。对其损坏部件,用国产配件进行替换,不乏为又快又省的维修方法。本文叙述了八年多来,我们在维修IM—200M型离子注入机的实践中,对损坏的吸极电源、氟里昂热交换器和化学机械泵等重要部件,用自制的或改制的国内配件进行替换,从而保证了设备安全运行二万五千多小时,注入八万五千多块硅及GaAs靶片,完成了集成电路研制和开发任务。     

Deep learning based physical layer wireless communication techniques:opportunities and challenges

The development of the fifth-generation wireless communications (5G) system is promoted by the high requirements of the high reliability and super-high network capacity.However,existing communication techniques are hard to achieve the high requirements due to the more and more complexity design in 5G system.Currently,deep learning is considered one of effective tools to handle the physical layer wireless communications.Several potential applications based on deep learning were reviewed,and their effectiveness were confirmed.Finally,several potential techniques in deep learning based physical layer wireless communications were pointed out.