Covalent adaptable network (CAN) polymers doped with conductive nanoparticles are an ideal candidate to create reshapeable, rehealable, and fully recyclable electronics. On the other hand, 3D printing as a deterministic manufacturing method has a significant potential to fabricate electronics with low cost and high design freedom. In this paper, we incorporate a conductive composite consisting of polyimine CAN and multi-wall carbon nanotubes into direct-ink-writing 3D printing to create polymeric sensors with outstanding reshaping, repairing, and recycling capabilities. The developed printable ink exhibits good printability, conductivity, and recyclability. The conductivity of printed polyimine composites is investigated at different temperatures and deformation strain levels. Their shape-reforming and Joule heating-induced interfacial welding effects are demonstrated and characterized. Finally, a temperature sensor is 3D printed with defined patterns of conductive pathways, which can be easily mounted onto 3D surfaces, repaired after damage, and recycled using solvents. The sensing capability of printed sensors is maintained after the repairing and recycling. Overall, the 3D printed reshapeable, rehealable, and recyclable sensors possess complex geometry and extend service life, which assist in the development of polymer-based electronics toward broad and sustainable applications.

光场成像拓展了经典光学成像的信息维度,为成像技术的提升和突破提供了更多的可能性,是计算成像领域的重要研究内容。光场携带了目标和场景的三维信息,通过对光场数据进行合理的建模和处理可以实现三维成像。光场三维成像技术可概括为光场深度估计和光场三维重建两大类。对于光场深度估计,根据深度计算的不同机理分为基于多视点立体的方法与基于极平面图的方法;对于光场三维重建,根据是否采用结构光照明分为主动和被动光场三维重建。简要介绍了光场的基本理论并回顾了常见的光场采集系统,分类介绍了光场三维成像的关键技术和典型工作并进行了技术展望。

针对栅极绝缘层和栅极引线接触处形成过孔倒角造成的一种垂直线不良进行分析和改善。研究气相沉积、干法刻蚀和磁控溅射对过孔倒角的影响, 通过扫描电子显微镜对过孔形貌进行表征, 并用成盒检测设备检测不良发生情况。实验结果表明: 通过过孔刻蚀功率、气压、气体流量的变更可以消除倒角现象, 垂直线不良由1.4%降为0.7%。

通过理论模拟CMOS工艺兼容的SiGe/Si 单光子雪崩二极管, 研究并讨论了掺杂条件对于电场分布、频宽特性、以及器件量子效率的影响。设计出具有浅结结构、可在盖革模式下工作、低击穿电压(30 V)的1.06 μm单光子技术雪崩光电二极管。 器件采用分离吸收倍增区结构, 其中Si材料作为倍增区、SiGe材料作为吸收区, 这充分利用了硅材料较高的载流子离化比差异, 降低了器件噪声;在1.06 μm波长下, SiGe探测器的量子效率为4.2%, 相比于Si探测器的效率提高了4 倍。仿真表明优化掺杂条件可以优化电场分布, 从而在APD击穿电压处获得更好的带宽特性。

车载扫描凝视系统在扫描成像时由于转台转动而引起的像移必然造成图像质量下降, 进而导致虚警率升高, 要消除像移必须进行像移补偿。基于像移产生原因以及双光楔对光束的导向模型, 推解出因转台旋转而需补偿的光楔的初始位置及旋转速度, 来补偿曝光阶段引起的像移。提出了基于双光楔的像移补偿的新方法。

In this paper, a hybrid electronic noses’ system (HENS) based on MOS-SAW detection units intended for lung cancer diagnosis is proposed. The MOS gas sensors are used to detect the VOC molecules with low molecular weight (LMW), and the SAW sensors are adopted for the detection of VOC with high molecular weight (HMW). Thus, the novel combination of these two kinds of gas sensors provides higher sensitivities to more of VOC species in breath than that of using only a single kind of sensor. The signals from MOS-SAW detection units are then recognized by a multi-model diagnosis method. Applying four algorithms, six models were established for diagnosis and tested by leave-one-out cross-validation method. The model by artificial neural network (ANN) was selected as the best model to analyze breath samples. 89 clinical samples were tested with MOS-SAW ANN diagnostic model, which takes the features derived from both the MOS and SAW sensors. It shows the highest sensitivity of 93.62%, and the highest selectivity of 83.37%. The study shows that, promisingly, our HENS is effective during screening of lung cancer patients, especially among the people of high risk.

Road pavement reflectance is usually assumed to be invariant in short periods of time in some quantitative remote sensing applications. To examine its variability, reflectance sequences of concrete and asphalt pavement are measured in field for half a day in visible and near-infarecd (VNIR) spectral range using dual-beam method. As much as 20.7% and 3.52% of relative changes are found in asphalt and concrete reflectance data at 550 nm, and all VNIR bands demonstrate similar variations found to correlate with both illumination geometry and the relative portion of diffuse irradiance. In this letter, this effect is interpreted from a mathematic view. Further studies are needed to model the dynamics of reflectance physically.

恒星－背景对比度是星敏感器白天探测恒星的一个重要参数，它决定了星敏感器可探测星等的极限值。叙述了恒星－背景对比度的计算方法，分析了星敏感器在3°×3°视场角和0°与40°两个观测角下，6等K和M型恒星的对比度随观测高度、太阳天顶角、波段和恒星光谱类型的变化特征。结果表明：对比度随观测高度的增加按指数增加，40 km高度上的对比度是10 km上对比度的100倍左右；随太阳天顶角的增加按线性增加，长波波段上80°太阳天顶角的对比度是20°时的6倍左右；经过滤波片(B+W090)滤光的全波段(0．4～1．0 μm)上的对比度和0．6～0．7 μm分波段的对比度较接近；全波段上的对比度随恒星光谱类型几乎不变化。这些结果可用于星敏感器在大气层内白天观测恒星的星等极限估计。