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In this paper, we first study the implementation process of the AdaBoost model, initialize the weight distribution of training samples so that each sample weight is equal, then generate weak classifiers and calculate the minimum weighted error rate corresponding to each weak classifier, and then linearly combine the basic classifiers into strong classifiers by using weighted summation. Then the basic classifier weighting parameter calculation formula is improved by combining the characteristics of the logistics distribution function. Finally, the algorithm is used to analyze the rural governance willingness of river country residents, as well as to analyze the rural governance needs of rural residents at three levels: living conditions, public health and service facilities, to identify the types of rural governance, and to explore the rural governance patterns of different types of farm households. At the level of living conditions, farmers who wish to improve cooking fuel in 54 households, heating conditions in 61 households, bathing conditions in 40 households and family toilets in 53 households account for 43%, 49%, 32% and 42%, respectively. A total of 80 farming households, accounting for 29.41% of the research farming households, were optimized and upgraded, including 66 households in the key development area and 14 households in the production and living security area, accounting for 82.5% and 17.5% of the optimized and upgraded type, respectively. The research method of this paper has important references and reference significance for the construction of rural governance.

In this study, we conducted a single-factor experiment where fine aggregates in each mixture were replaced with coal-fired slag at replacement rates in the range of 0–100%. We investigated the effect of slag substitution rate on the cubic compressive strength, splitting tensile strength, axial compressive strength, and static modulus of elasticity of slag concrete. Based on the experimental data, the stress–strain curve of the coal-fired slag concrete was divided into four phases: elastic, elasto-plastic, peak, and decline phases. A stress–strain constitutive equation was established to describe the coal-fired slag concrete. A replacement rate of 50% of the formulated coal-fired slag concrete meets the strength requirements of C60 structural applications, and the cubic compressive strength is the same as that of ordinary concrete. Coal-fired slag can be utilized in large quantities, improving the economic value of coal-fired slag and expanding the scope of application of slag concrete. [ABSTRACT FROM AUTHOR]

Objective To evaluate the effects of three antidepressants with different mechanisms on connexin expression and channel function of hippocampal astrocytes. Methods The cytotoxicity of antidepressants with different mechanisms on hippocampal astrocytes was assessed by CCK-8 assay. The effects of three antidepressants with different mechanisms on gap junction function and the expression level of connexin 43 protein （Cx43） were determined by cell inoculation fluorescence tracing and western blot. Results CCK-8 assay showed that 25.00 µmol/L fluoxetine, 0.10 µmol/L amitriptyline and 0.20 nmol/L venlafaxine had no cytotoxicity on hippocampal astrocytes （all P > 0.05）. In addition, 25.00 µmol/L fluoxetine, 0.10 µmol/L amitriptyline and 0.20 nmol/L venlafaxine could significantly inhibit the fluorescence transfer function of gap junction in hippocampal astrocytes （all P < 0.05）, whereas three antidepressants exerted on effects upon the expression of Cx43 in hippocampal astrocytes （all P > 0.05）. Conclusion Antidepressants can significantly reduce the gap junction function composed of Cx43 in hippocampal astrocytes.

[Objective] To meet the application requirements of miniaturized and multifunctional dielectric resonator antennas (DRA) in wireless communication systems, such as the Internet of Vehicles (IoV). [Method] A wideband filtering dielectric resonator antenna based on a microstrip-dual mode slotline resonator feeding structure is proposed. In the antenna design process, the traditional slotline of the microstrip-slotline coupled feeding structure was replaced by a dual mode slotline resonator, forming a novel microstrip-dual mode slotline resonator coupling feeding network. This dual mode slotline resonator served as an energy coupler in the feeding network, which effectively excited the TE111 resonant mode of the DRA; At the same time, two slotline resonant modes could also be generated to participate in antenna resonance, broadening the antenna bandwidth. Additionally, by introducing a spur line on the microstrip feedline and combining the intrinsic resonance characteristics of the slotline resonator, a radiation null can be produced on both sides of the antenna passband, showing a quasi-elliptical filter response on the gain curve. [Result] To further verify the performance of the antenna design, a pro totype FDRA was fabricated and measured, and the measurement and simulation results were generally consistent. The central frequency of the antenna is 4.12 GHz, the impedance bandwidth is 53.40 % (3.02~5.22 GHz), and the in-band flat gain is 5.7 dBi. [Conclusion] The antenna meets the application requirements of wireless communication systems, such as 5G and telematics. [ABSTRACT FROM AUTHOR]

Aim: Climate is widely understood to determine elevational patterns of soil microbial communities, whereas the effects of parental material are uncertain. Changes in the composition of parental materials along elevational transects could also affect soil microbial communities by influencing soil pH and nutrient availability. Here, we aim to illustrate the combined effects of climate and parental material on the biomass and composition of soil microbial communities along an elevational transect. Location: A subtropical forest on a karst mountain (Mt. Jinfo), China. Taxon: Bacteria and Fungi. Methods: We use phospholipid fatty acid analysis (PLFA) and DNA amplicon high‐throughput sequencing to determine biomass and diversity patterns of soil microbial communities along a subtropical elevational gradient with contrasting parental materials (limestone and clasolite). Results: We observed that the microbial communities were more diverse (α‐diversity) and productive (biomass) on limestone than on clasolite. Additionally, we found that parental material played a role in shaping the composition (β‐diversity) of soil microbial communities along the elevational gradient. The impact of climate on soil microbial communities was found to be significant, albeit relatively weak. Structural equation models provided evidence for both direct and indirect effects of climate and parental material on microbial biomass and α‐diversity along the elevational gradient. Notably, the changes in soil pH, influenced by both parental material and climate, were identified as a key factor driving these effects. Main Conclusions: Our results underline the importance of both climate and parental material variations in space‐for‐time studies investigating soil microbial communities along elevational gradients. [ABSTRACT FROM AUTHOR]