A Polymer Defect Passivator for Efficient Hole-Conductor-Free Printable Mesoscopic Perovskite Solar Cells

Due to the low cost and excellent potential for mass production, printable mesoscopic perovskite solar cells (p-MPSCs) have drawn a lot of attention among other device structures. However, the low open-circuit voltage (V_OC) of such devices restricts their power conversion efficiency (PCE). This limitation is brought by the high defect density at perovskite grain boundaries in the mesoporous scaffold, which results in severe nonradiative recombination and is detrimental to the V_OC. To improve the perovskite crystallization process, passivate the perovskite defects, and enhance the PCE, additive engineering is an effective way. Herein, a polymeric Lewis base polysuccinimide (PSI) is added to the perovskite precursor solution as an additive. It improves the perovskite crystallinity and its carbonyl groups strongly coordinate with Pb²⁺, which can effectively passivate defects. Additionally, compared with its monomer, succinimide (SI), PSI serves as a better defect passivator because the long-chained macromolecule can be firmly anchored on those defect sites and form a stronger interaction with perovskite grains. As a result, the champion device has a PCE of 18.84%, and the V_OC rises from 973 to 1030 mV. This study offers a new strategy for fabricating efficient p-MPSCs.     

A Hybrid Strategy-Based Ultra-Narrow Stretchable Microelectrodes with Cell-Level Resolution

Stretchable ultra-narrow (e.g., 10 µm in width) microelectrodes are crucial for the electrophysiological monitoring of single cells providing the fundamental understanding to the working mechanism of neuro network or other electrically functional cells. Current fabrication strategies either focus on the preparation of normal stretchable electrodes with hundreds of micrometers or millimeters in width by using inorganic conductive materials or develop conductive organic polymer gel for ultra-narrow electrodes which suffer from low stretchability and instability for long-term implantation, therefore, it is still highly desirable to explore bio-interfacial ultra-narrow stretchable inorganic electrodes. Herein, a hybrid strategy is reported to prepare ultra-narrow multi-channel stretchable microelectrodes without using photolithography or laser-assisting etching. A 10 µm × 10 µm monitoring window is fabricated with enhanced interfacial impedance by the special rough surface. The stretchability achieves to 120% for this 10 µm-width stretchable electrode. Supported by these superior properties, it is demonstrated that the stretchable microelectrodes can detect electrophysiological signals of single cells in vitro and collect electrophysiological signals more precisely in vivo. The reported strategy will open up the accessible preparation of the fine-size stretchable microelectrode. It will significantly improve the resolution of monitoring and stimulation of inorganic stretchable electrodes.     

基于历史数据和多目标优化的测试用例排序方法

针对如何提高测试用例序列的揭错效率和回归测试效益问题,提出一种基于历史数据和多目标优化的测试用例排序方法。首先,根据测试用例的文本主题相似性和代码覆盖相似性对测试用例集进行聚类,并根据历史执行信息对测试用例间的执行失败关系进行关联规则挖掘,从而为后续过程做准备;然后,利用多目标优化算法对每个类簇内的测试用例进行排序,在此之后生成最终排序序列,使相似的测试用例分隔开;最后,利用测试用例间的关联规则,动态调整测试用例执行次序,从而使可能失败的测试用例优先执行,以进一步提高缺陷检测效率。与随机排序方法、基于聚类的排序方法、基于主题模型的排序方法、基于关联规则和多目标优化的排序方法相比,所提方法的平均故障检测率（APFD）平均值分别提高了12.59%、5.98%、3.01%和2.95%,基于成本的平均故障检测率（APFDc）平均值分别提高了17.17%、5.04%、5.08%和8.21%。实验结果表明,所提方法能有效提高回归测试效益。     

基于改进YOLOX-s的安全帽检测

在施工现场中, 发生过许多高空坠落事故, 因此在施工现场佩戴安全帽是十分有必要的. 针对安全帽佩戴状况检测中遇到的小目标样本缺检、漏检的情况, 提出一种基于YOLOX-s的改进算法. 首先, 在Neck层引入主干特征提取网络中的160×160特征层进行特征融合, 并且增加了一个针对小目标的检测头; 其次, 采用SIoU损失函数计算损失值, 使得网络在训练过程中考虑的损失项更加全面; 并且采用varifocal loss函数来计算置信度损失值, 进一步改善训练过程中存在的正样本与困难样本不均衡的问题, 最后, 采用CA (coordinate attention)注意力机制来增强模型的特征表达能力. 实验结果表明, 通过对Neck层与检测层、损失函数的优化以及引入CA注意力机制, 使得网络在训练过程中收敛与回归性能更佳. 改进后的算法的mAP值为95.57%, 相较于YOLOv3及原YOLOX-s算法在mAP值上分别提高了17.11%、3.59%. 改进后的算法检测速度为54.73帧/s, 符合实时检测速度要求.     

智慧水文应用数字孪生5G专网用户自运营管理实践研究--以曲靖市5G智慧水文面店示范站项目为例

中国移动助力云南省曲靖市落地5G智慧水文面店示范站项目实践,融合5G、北斗、云计算、物联网、数字孪生等新技术,基于中国移动OneLink平台和OneNET平台定制开发了曲靖水文5G数字孪生运用管理云平台,提供软硬件总集成服务成功打造曲靖市5G+智慧水文面店示范站。该实践树立了5G专网用户自运营管理的成功标杆,为水文行业以及对5G专网用户自运营管理有需求的政府及企事业单位起到成功案例借鉴复制作用。     

A Metal–Polyphenol Network Coated Nanotheranostic System for Metastatic Tumor Treatments

As a characteristic trait of most tumor types, metastasis is the major cause of the death of patients. In this study, a photothermal agent based on gold nanorod is coated with metal (Gd³⁺)‐organic (polyphenol) network to realize combination therapy for metastatic tumors. This nanotheranostic system significantly enhances antitumor therapeutic effects in vitro and in vivo with the combination of photothermal therapy (PTT) and chemotherapy, also can remarkably prevent the invasion and metastasis due to the presence of polyphenol. After the treatment, an 81% decrease in primary tumor volumes and a 58% decrease in lung metastasis are observed. In addition, the good performance in magnetic resonance imaging, computerized tomography, and photothermal imaging of the nanotheranostic system can realize image‐guided therapy. The multifunctional nanotheranostic system will find a great potential in diagnosis and treatment integration in tumor treatments, and broaden the applications of PTT treatment.     

CMSs/PET微胶囊阻燃PET纤维制备与表征

将采用原位聚合法自制的核-壳型碳微球(CMSs)/聚对苯二甲酸乙二醇酯(PET)微胶囊(PCMSs)作为阻燃剂,采用熔融纺丝法制备阻燃PCMSs/PET功能纤维。通过扫描电镜、声速仪、强伸仪、极限氧指数仪等测试设备对添加不同质量分数的阻燃剂的阻燃功能纤维的结构及性能进行测试和表征。结果表明:当阻燃剂PCMSs的质量分数为0.6%时,PCMSs在PET纤维基体中的分散性和相容性良好,此时纤维表面较为光滑,同时具有优良的吸湿性能和阻燃性能,但其力学性能稍低于PCMSs质量分数为0.2%时的PCMSs/PET纤维。