Real-Time Detection and Instance Segmentation of Strawberry in Unstructured Environment

The real-time detection and instance segmentation of strawberries constitute fundamental components in the development of strawberry harvesting robots.Real-time identification of strawberries in an unstructured envi-ronment is a challenging task.Current instance segmentation algorithms for strawberries suffer from issues such as poor real-time performance and low accuracy.To this end,the present study proposes an Efficient YOLACT(E-YOLACT)algorithm for strawberry detection and segmentation based on the YOLACT framework.The key enhancements of the E-YOLACT encompass the development of a lightweight attention mechanism,pyramid squeeze shuffle attention(PSSA),for efficient feature extraction.Additionally,an attention-guided context-feature pyramid network(AC-FPN)is employed instead of FPN to optimize the architecture’s performance.Furthermore,a feature-enhanced model(FEM)is introduced to enhance the prediction head’s capabilities,while efficient fast non-maximum suppression(EF-NMS)is devised to improve non-maximum suppression.The experimental results demonstrate that the E-YOLACT achieves a Box-mAP and Mask-mAP of 77.9 and 76.6,respectively,on the custom dataset.Moreover,it exhibits an impressive category accuracy of 93.5%.Notably,the E-YOLACT also demonstrates a remarkable real-time detection capability with a speed of 34.8 FPS.The method proposed in this article presents an efficient approach for the vision system of a strawberry-picking robot.

微生物教学实验室中不同有效成分洗手/消毒液对手卫生效果的比较分析

目的评估不同手部抑菌消毒产品对微生物实验室操作人员手部清洁的效果。方法微生物实验室工作人员分别使用含有不同主要抑菌成分的洗手液/消毒液对手部进行消毒处理,对消毒前后培养出的菌落样本进行菌落种类计数、革兰染色和生化、药敏鉴定,并对检验结果进行整合、对比和分析。结果在所研究的实验条件下,主要成分为63%-75%(V/V)乙醇和0.45%-0.55%(W/N)醋酸氯己定的品牌8对大多数细菌有着良好的消毒效果;主要抑菌成分为0.18%-0.22%(W/W)对氯间二甲苯酚的品牌6和0.18%-0.22%(W/W)吡罗克酮乙醇胺盐的品牌7的消毒效果相对较差。含0.27%-0.33%(W/W)水杨酸的品牌5和含0.32%-0.38%(W/W)水杨酸的品牌1对特定菌种有较好的消毒效果;含0.000126%-0.000154%(W/W)银离子的品牌2效果较一般,而无抑菌成分的洗手液对大多数菌种皆无明显抑制作用。结论在所研究的微生物实验室条件下,主要成分为63%-75%(V/V)乙醇和0.45%-0.55%(W/N)醋酸氯己定的免洗消毒液抑菌效果最好,不同品牌洗手液的效果均不如免洗消毒液,且洗手/消毒程序不影响免洗消毒液的抑菌效果。

ICIs联合治疗应用于EGFR突变靶向治疗耐药后非小细胞肺癌的研究进展

随着肺癌精准医学的发展,靶向治疗极大地改善了晚期非小细胞肺癌(non-small cell lung cancer,NSCLC)患者的生存和预后,但获得性耐药的发生使患者最终面临无靶向药可用的局面,对于这部分患者后续没有标准的治疗选择。免疫检查点抑制剂(immune checkpoint inhibitors,ICIs)的出现使晚期NSCLC治疗发生革命性的改变,但由于表皮生长因子受体(epidermal growth factor receptor,EGFR)突变的NSCLC具有免疫抑制的肿瘤微环境(tumor microenvironment,TME)等独特之处,使得单一的ICIs治疗在EGFR突变的NSCLC患者中临床获益有限,将ICIs与化疗和/或靶向等治疗相结合是大势所趋。该篇综述中进一步讨论了可能从ICIs治疗中受益的具有EGFR突变的潜在亚群,还分析了在联合免疫治疗时代下如何决策可使ICIs治疗应用于EGFR突变靶向治疗耐药后NSCLC患者获得疗效最大化,以期实现个体化治疗。

Research of Pure Electric Ferry System and Its Short-Circuit Protection and Calculation

System control and safety reliability are important links of the marine DC (Direct Current) power system. The simulationmodel is built by Matlab/Simulink, the battery and super-capacitor are supplied to the system through a three-phase interleaved DC/DCconverter, the fuse and disconnector switch combination are used as the protection device, and the short-circuit point is set betweeneach branch and the DC distribution board, performing short-circuit simulation. This paper also proposes a short-circuit calculationmethod for super-capacitors based on the simplified model of series RC (Resistors & Capacitors), and verifies its correctness throughsimulation data. The results show that the introduction of a three-phase interleaved DC/DC converter reduces the current ripple andmakes the system control more convenient;short-circuit calculation and simulation have determined the short-circuit withstandcapability of the DC distribution board, and verified the feasibility of the fuse selection method and the short-circuit calculation methodof the super-capacitor. This provides reliable verification for the application and calculation of the actual project.

An overview of metal hydroxyfluoride-A novel semiconductor material

Semiconductors have been widely used in many high-tech fields such as photo-and electro-catalysis,ion bat-teries,and solar cells.In addition to the earliest discovered elemental and compound semiconductors,such as monocrystalline silicon and metal oxides,new types of compound semiconductors have been discovered.Among them,metal hydroxyfluorides(MOHF)are an emerging type of semiconductor that are easy to synthesize and inexpensive.However,many of their properties and applications are not well understood.Nevertheless,some MOHF materials,such as ZnOHF and CoOHF,have been sufficiently developed,and their applications have been extensively explored.This review focuses on a new compound semiconductor,MOHF,with ZnOHF and CoOHF as the typical.After a short introduction to their physical and chemical properties,their common applications are illustrated with several examples.Subsequently,other less-researched MOHF and MOHF-like materials,as well as their applications,are discussed.Moreover,the expectations and development directions of MOHFs are briefly summarized.

One-pot solvothermal synthesis of hierarchical Co-doped NiO microspheres with enhanced hydrogen sulfide sensing performances

In this study we report,for the first time,the synthesis of Co-doped NiO microspheres assembled by two-dimension nanosheets using a facile solvothermal method.The H 2 S gas-sensing performance of the as-prepared samples was systematically investigated.The result demonstrates that the Co–NiO sensor with Co/Ni molar ratio of 1%(1%Co–NiO)exhibits high response(12.9)and rapid response speed(110 s)to 20×10^(−6) H_(2)S at 200℃ in comparison with the pure NiO sensor.Moreover,excellent selectivity,repeatability,and stability were achieved.The sensing mechanism illustrates that the superior gas-sensing properties can be attributed to two factors.(1)The hierarchical microspherical construction with an ultrahigh specific surface area of 163.1 m^(2)g^(−1) provides adequate active sites for H_(2)S gas adsorption,porous structures,and an interlayer gap that accelerates the diffusion of H_(2)S gas,resulting in improved sensitivity and response speed of the sensor.(2)Co-doping results in a decrease in the particle sizes(ca.4 nm)and increase in the number of adsorbed ionized oxygen species,which improves sensitivity and selectivity.Therefore,this study provides a facile approach for the synthesis of hierarchical Co–NiO microspheres with enhanced H_(2)S gas-sensing performance.