Construction personnel dress code detection based on YOLO framework

It is important for construction personnel to observe the dress code,such as the correct wearing of safety helmets and reflective vests is conducive to protecting the workers'lives and safety of construction.A YOLO network-based detection algorithm is proposed for the construction personnel dress code(YOLO-CPDC).Firstly,Multi-Head Self-Attention(MHSA)is introduced into the backbone network to build a hybrid back-bone,called Convolution MHSA Network(CMNet).The CMNet gives the model a global field of view and enhances the detection capability of the model for small and obscured targets.Secondly,an efficient and lightweight convolution module is designed.It is named Ghost Shuffle Attention-Conv-BN-SiLU(GSA-CBS)and is used in the neck network.The GSANeck network reduces the model size without affecting the perfor-mance.Finally,the SIoU is used in the loss function and Soft NMS is used for post-processing.Experimental results on the self-constructed dataset show that YOLO-CPDC algorithm has higher detection accuracy than current methods.YOLO-CPDC achieves a mAP50 of 93.6%.Compared with the YOLOv5s,the number of parame-ters of our model is reduced by 18%and the mAP50 is improved by 1.1%.Overall,this research effectively meets the actual demand of dress code detection in construction scenes.

Novel Co_3O_4 Nanoparticles/Nitrogen-Doped Carbon Composites with Extraordinary Catalytic Activity for Oxygen Evolution Reaction(OER)

Herein, Co_3O_4 nanoparticles/nitrogen-doped carbon(Co_3O_4/NPC) composites with different structures were prepared via a facile method. Structure control was achieved by the rational morphology design of ZIF-67 precursors, which were then pyrolyzed in air to obtain Co_3O_4/NPC composites. When applied as catalysts for the oxygen evolution reaction(OER), the M-Co_3O_4/NPC composites derived from the flower-like ZIF-67 showedsuperior catalytic activities than those derived from the rhombic dodecahedron and hollow spherical ZIF-67. The former M-Co_3O_4/NPC composite displayed a small overpotential of 0.3 V, low onset potential of 1.41 V, small Tafel slope of 83 m V dec^(-1), and a desirable stability.(94.7% OER activity was retained after 10 h.) The excellent performance of the flower-like M-Co_3O_4/NPC composite in the OER was attributed to its favorable structure.

Analysis on Immune Tolerance and Resistance Mechanism of <i>Cryptococcus albidus</i>of AIDS Patients with Opportunistic Cryptococci Infection

Objective: To explore more about the immune tolerance and drug resistance of white Cryptococci albidus in AIDS patients with opportunistic Cryptococcus infection. Methods: To analyze drug resistance of the samples of white Cryptococcus albidus extracted from opportunistic infection AIDS patients in the certain infection area from October 2011 to December 2014. Results: After analyzing two samples of Cryptococcus albidus from 885 cases with opportunistic infection, we found that one of the samples do resist to ten common antibiotics. They were fluconazole, flu-cytosine, fluconazole, caspofungin, amphotericin B, MI miconazole, terbinafine, ketoconazole and itraconazole. The other one was sensitive to voriconazole, but resistant to the rest of the drug. Two strains of bacteria were inoculated into the animals in vivo and their DNA was extracted to carry out the genotyping analysis. The results showed that different degrees of resistance gene amplification bands were found in the 10 kinds of antibiotics. Conclusion: Although there were few opportunistic infection Cryptococcus albidus in AIDS patients, it was easy to show its resistance to drugs. Therefore, great attention should be paid to it for the medical workers.

Design and Implementation of Multi-element Integration Platform Based on Tianqing Data

In order to better carry out meteorological service and improve service efficiency,based on Tianqing data multi-factor integration platform,using Tianqing intensive data source of big data cloud platform,daily and hourly precipitation,temperature and wind data can be acquired,and C#language can be used to realize data analysis,text template nesting,meteorological material generation and archive management functions.The application shows that the platform can quickly complete the production of rain information within 2 min,and the material filing management has zero errors,which is superior to the traditional methods in terms of framework design and data processing material management.

Contribution of Meteorological Disaster Prevention and Reduction Services to Rural Revitalization

In the context of rural revitalization and development,meteorological services for agricultural disaster prevention and reduction are facing new opportunities and challenges.It is needed to fully understand the importance of strengthening meteorological disaster prevention and reduction services,accurately grasp the strategy of rural revitalization,recognize the shortcomings in work,adhere to modern capacity building,improve the meteorological monitoring network,build a meteorological service system for agriculture and meteorological disaster prevention mechanism in line with rural revitalization,enhance the research and development capability of meteorological service products,expand the coverage of meteorological services,and effectively make greater contributions to rural revitalization.

Preliminary Study on Forest Fire Prevention and Extinguishing in Townships in the Southern Mountainous Areas of Zhejiang Province:A Case Study of Lishui

Forest fires seriously threaten forestry resources and the life and property safety of people in mountainous areas of Lishui City. In this paper, a fire prevention concept with refined forecast and early warning of forest fire danger weather ratings in townships as the starting point, satellite real-time observation of fire spots, monitoring of the Internet of Things and other high-tech products as an implementation means, and strengthening forest fire prevention equipment and personnel in townships as a guarantee was established. The command system for rapid emergency response by cities, counties and townships should be improved. During the forest fire prevention period, fire sources should be strictly controlled, and the basic principles of forest fire fighting in townships should be implemented into the actual fire prevention and fire fighting work to eliminate forest fires in time at the initial stage and before the disaster.

Cofactor manipulation to drive biosynthesis of natural products

Microbial production of value-added products is a promising alternative to plant-and chemical-based routes[1].However,only few of interested chemicals are producing at bulk scale with microbial cell factories(eg.artemisinic acid)while most are staying at bench level.To enable the microbes toward efficient bioproduction,extensive endeavors have been expended on enzyme exploration and pathway decoration,leaving the role of cofactors,especially the rare cofactors like SAM,FMN(H_(2))and FAD(H_(2)),largely unconsidered[2,3].

Visible light-promoted aerobic oxidative cleavage and cyclization of olefins to access 3-hydroxyisoindolinones

A convenient and environmentally friendly synthetic route from 2-vinylbenzimide to 3-hydroxy-isoindolinones through visible light-promoted transformations via iron/disulfide catalysis and molecular oxygen oxidation has been developed.A range of 3-hydroxy-isoindolinones was obtained in moderate to good yields,which exhibit excellent functional group compatibility and broad substrate scope.Further mechanistic investigations proved that dioxetane might be a key intermediate being involved in the reaction.