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Based on the Markov model, a fault warning system for power grid operation is proposed. Its main objective is to improve the execution effect of alarm commands. Firstly, the power grid operation reliability evaluation model based on the Markov model is established. According to the set critical value to judge the change of power grid operation state. Develop abnormal alarm commands for power grid operation. Strange events are described in detail using natural language technology, and corresponding instructions are completed in the system. After the comparative test, the new alarm improved more remarkably than the traditional intelligent alarm mode.

This paper introduces a communication network health monitoring technology and integrated operation management platform based on a power switching network. Firstly, network characteristics are described from technology, structure and service function. Separate regular communication networks. This paper studies a new condition-monitoring technology based on a power-switching network. This paper studies the topology of the AC power network. The condition of the network is carried out through the neural network. According to the perception results, an integrated operation management system is constructed to provide users with relevant data. This section describes the network fault status, fault diagnosis, and features of fiber hopping services. This paper offers some suggestions for operating and maintaining a power-switched network.

In view of poor timeliness， low accuracy and insufficient visualization of existing methods of mountain fire prevention inspection and monitoring in transmission channels， the paper proposes a method based on relaying cooperative operation of two UAVs to carry out mountain fire inspection in transmission channels in combination with the characteristics of UAVs such as high efficiency and flexibility. The cooperative inspection mode of UAV can maintain the UAV data link through relaying technology and transmit back the video data collected by the UAV in real time， which facilitates to timely carry out disaster prevention decision and deployment and solves the problems of complex terrain-blocked data link signal and real-time monitoring of fire in transmission channels. The practical results show that the high-frequency UAV relaying cooperative fire prevention inspection operation for important transmission channels during the period of a high incidence of mountain fires is effective in discovering the fire hazards at the initial stage and provides a new technical means for the differentiated fire prevention inspection of transmission channels.

This study focuses on three different regions of moso bamboo (Phyllostachys edulis): an inner layer (IB), middle layer (MB), and outer layer (OB), to comprehensively characterize the structural features, chemical composition (ash, extractives and lignin contents), and the lignin monomeric composition as determined by analytical pyrolysis. The results show that bamboo presents a gradient structure. From the IB to OB, the vascular bundle density and fiber sheath ratio increase, the porosity decreases (from 45.92% to 18.14%), and the vascular bundle diameter–chord ratio increases (from 0.85 to 1.48). In terms of chemical composition, the ash, extractives, and acid-soluble lignin content gradually decrease from IB to OB. The holocellulose content follows the trend: MB (66.3%) > OB (65.9%) > IB (62.8%), while the acid-insoluble lignin content exhibits the opposite trend: IB (22.6%) > OB (17.8%) > MB (17.7%). Pyrolysis products reveal the diversity of carbohydrates and lignin derivatives, with a lignin monomeric composition rich in syringyl and guaiacyl units and lower amounts of H-units: the IB has an H:G:S relation of 18:26:55, while 15:27:58 is the ratio for the MB and 15:40:45 for the OB; S/G ratio values were, respectively, 1.22, 1.46, and 0.99. A comprehensive analysis highlights significant gradient variations in the structure and chemistry of bamboo, providing robust support for the classification and refinement methods of bamboo residues for potential applications. [ABSTRACT FROM AUTHOR]

It is important to improve the overall quality of rice grown in northeastern China, which is famous for its high yield. Therefore, it is necessary to study the quality of japonica rice resources in the region. This study analyzed 71 rice samples from the Liaoning, Heilongjiang, and Jilin Provinces, focusing on grain shape, endosperm composition, and taste. Significant regional differences were observed in taste and edibility, with the samples from Heilongjiang and Jilin generally scoring higher taste value, which was significantly higher than the Liaoning variety. However, the Liaoning varieties were more stable in terms of the sensory evaluation of taste. Obvious differences in grain length were detected among the samples, with the varieties from Jilin and Heilongjiang Provinces predominantly having short and medium-to-long grains, respectively, and those from Liaoning Province having diverse grain shapes. However, there was no correlation between grain shape and taste. This indicated that the taste of rice is not affected solely by its external morphology but also by multiple interacting factors. There were significant differences in endosperm composition among the three provinces, but the amylose content of the tested varieties was generally less than 18%, and the protein content was about 6%. Additionally, the Jilin Province varieties had the lowest apparent amylose content and long chain of amylopectin (Fb3), the Heilongjiang Province varieties had the lowest protein content, and there were more medium chains of amylopectin. Notably, protein content was negatively correlated with taste but positively correlated with pasting properties. It can be seen that the premise of varieties in different provinces showing good taste characteristics is to ensure the content of amylose and protein is low, and adjust the proportion of amylopectin chain length. [ABSTRACT FROM AUTHOR]

In this study, 3 haplotypes were found in populations of Phellodendron amurense based on two combined cpDNA regions (psbA-trnH and trnT-trnL). Nucleotide diversity and haplotype diversity were 0.43×10-3 and 0.41, respectively at the level of species. The AMOVA revealed that only 8.53% of the variation was explained by differences among geographical groups, whereas inter-population and intrapopulation differences explained 18.32% and 71.35% of the variation, respectively. Phylogeographical relationships showed that all haplotypes were clustered into two lineages. Haplotype H1 and H2 cluster together, and Haplotype H3 composed a group. TCS network of haplotypes showed that haplotype H1 located in the center of the lineage, and it appears to be an ancestral haplotype. So we hypothesized that Northeast China populations and North China populations had a common origin. The mismatch distribution of this species suggested that all populations and populations in North China had not undergone recent expansion, but populations in Northeast China had undergone recent expansion. The results were consistent with the results of Tajima’s D and Fu’s and Li’s D test.

Using bamboo residue and high-density polyethylene (HDPE) as the main raw materials, core–shell structured wood plastic composites (WPCs) with nano-CaCO3 filling shell were prepared by coextruded technology. The effect of nano-CaCO3 contents on the flexural properties, impact strength and dynamic thermo-mechanical properties of the core–shell structured WPCs were investigated. And the value of core–shell interface interaction parameter was calculated by dynamic thermodynamic parameters. The results showed that the flexural strength increased by 48.1% and 40.3% when it was loaded with 10%–15% nano-CaCO3, compared to the HDPE shell composites, respectively. While nano-CaCO3-filled HDPE shell had lower impact strength in comparison with HDPE shell, the field emission scanning electron microscope revealed proper interfacial adhesion between the core and shell layers. The storage modulus of core–shell structured WPCs increased as nano-CaCO3 contents increased, but the values were lower than that of the HDPE shell. Addition of nano-CaCO3 caused an increase in the glass transition temperature (Tg) of the core–shell structured WPCs, loss factor (tanδ) of the core–shell structured WPCs decreased. The value of the core–shell interface interaction parameter of the core–shell structured WPCs increased significantly after the nano-CaCO3 loading reached 15%, which was consistent with the bending test results. These findings demonstrate that the core–shell structured WPCs have excellent properties filling with nano-CaCO3 in the shell layer, and bamboo residue is added to the core layer. [ABSTRACT FROM AUTHOR]

A study was conducted of electroluminescence from a new class of conjugated polymers based on poly(bithiazole)'s. The emission spectra of these polymers range from blue-green to red. These polymers also exhibit high thermal and oxidative stabilities. The findings indicate that the light-emitting diode (LED) characteristics change and bubble formation was due to the adhesion loss at the top contact/polymer interface. Furthermore, the roughness of back contact and uniformity of polymer active layer were essential to LED electrical stability.