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通过4根传统风格建筑方钢管混凝土(concrete filled steel tube,CFST)-圆钢筋混凝土(reinforced concrete,RC)混合柱的低周往复加载试验,分析了传统风格建筑CFST-RC混合柱的破坏形态及侧向变形分布,根据CFST-RC混合柱的简化力学模型,给出了试件的弹性侧移刚度计算公式,计算结果与试验结果吻合较好。通过Abaqus有限元参数分析,得到了钢管屈服强度、混凝土强度、纵筋配筋率、上下柱线刚度比及轴压比对CFST-RC混合柱延性的影响规律。结果表明:随着钢管屈服强度、混凝土强度、纵筋配筋率的提高,传统风格建筑CFST-RC混合柱的水平承载力提高,延性降低;在一定范围内,增大上、下柱线刚度比能够提高CFSTRC混合柱的延性,但上、下柱线刚度比过大,CFST-RC混合柱的延性反而降低;随着轴压比的增大,CFSTRC混合柱的水平承载力及延性降低。

针对无人机组网通信的需求,利用MIMO（多输入多输出）技术可以获得分集增益、提高通信质量的优势,构建了一个无人机协作通信系统模型。提出了一种解决MIMO协作传输的组簇算法,对通信传输过程的信干噪比情况进行了理论分析,得知协作传输相比单节点传输可以有效提高信干噪比。在构建的模型下进行了仿真,验证了分析结果的正确性。同时对组簇算法中嵌入的同步技术进行了仿真,可以有效地解决码间串扰问题。

针对Ad Hoc网络中的节点位置估计和路由控制问题,在基于OLSR（最优链路状态路由）协议的基础上提出了一种能够同时实现路由和定位的综合协议OLSR-P（最优链路状态路由和定位）。该协议对OLSR协议进行了改进,能够将路由开销和定位有效结合,并对数据包结构进行改良,利用原协议的路由开销实现定位。仿真实验结果表明:OLSR-P协议不仅能够同时实现路由和定位,还能有效地控制开销。

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The clay-alginate composites showed relatively excellent drug sustained-release properties. In order to enhance the sustained-release property of bentonite-alginate composite gels, the alachlor loaded chitosan quaternary modified bentonite-alginate composite gel was prepared. The underlying effect and mechanism of the structure of modified bentonite-alginate composite gels on the release behavior of alachlor were explored by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TG). The results showed that the release of alachlor from the composite gel was dominated by Fickian diffusion and closely related to the adsorption capacity and permeability of the matrix. The chitosan quaternary combined with the negative charge sites on the surface of bentonite nanoplatelets, which significantly enhanced the adsorption capacity of bentonite for alachlor, and the adsorption equilibrium constant (Ka ) of alachlor on bentonite and modified bentonite were 0.13 and 0.40, respectively. Also, the stacking aggregation of bentonite nanoplatelets and the permeability of the gel network were effectively reduced through the electrostatic interaction between chitosan quaternary and alginate, and the permeability of modified bentonite-alginate composite gel is 9.6 times that of pure alginate gel. The release kinetics of alachlor from the composites revealed that the release rate of alachlor from the composite gel first decreased and then increased as the content of clay gradually increased. The best-sustained release property of composite gel was obtained when the mass fractions of alginate, chitosan quaternary modified bentonite, alachlor, and deionized water were 1.6%, 0.2%, 0.2%, and 97.8%, respectively, under which the release time of alachlor from bentonite-alginate and modified bentonite-alginate composite gels was 4.4 and 8.3 times longer than the release from pure alginate gel, respectively. [ABSTRACT FROM AUTHOR]

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At present, the state has issued a series of policies to encourage and support migrant workers to return to their hometowns to find jobs or start businesses. The situation of migrant workers returning to their hometowns for employment and entrepreneurship is improving, but there are still many problems. Based on 56 questionnaires collected from 9 cities in Hebei Province in July 2021, this paper analyzes the basic situation and employment situation of returnees, and explores their employment choices and influencing factors after returning to their hometowns. The study finds that the returnees are mostly engaged in agriculture, service industry and manufacturing, and their employment and entrepreneurship choices are mostly influenced by migrant work experience. Their human capital, family factors, capital constraints, and policy support for entrepreneurship and employment also affect their choice of entrepreneurship and employment. According to the research results, this paper puts forward some policy suggestions to promote the employment and entrepreneurship of returnees, such as increasing skills training, developing rural industries, lowering the financing threshold and increasing policy support. [ABSTRACT FROM AUTHOR]

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In order to improve the efficiency of water and fertilizer, and guide the scientific watering and fertilization of the poplar, using Populus deltoides Bartr. Huashi 2 as the material, the growth and photosynthetic characteristics were compared and analyzed in different water gradient and fertilizer amount. The two-factor analysis of variance of water and fertilization showed significant difference in seedling height and ground diameter between different soil water (P<0.05), significant difference in ground diameter between different fertilizer amount (P<0.05), but no significant difference in seedling height. The growth of A4B4 was the worst, and the growth of A2B2 was the best. No matter different fertilizer amount or soil water, the numbers of leaves were significantly different (P<0.05), the numbers of leaves in A4B1 were the least, the mean value was 17.67, while the numbers of leaves in A1B2 were the largest, with an average value of 39.00. It was found that the treatments with lower chlorophyll content were mainly those with less fertilizer amount (B4), while the treatments with higher chlorophyll content were mainly those with higher fertilizer amount (B1,B2). The maximum light saturation point (PLS) was A1B1(1961.59 μmol·m-2·s-1), and the maximum net photosynthetic rate (Pnmax) of A2B1 was the highest (24.75 μmol·m-2·s-1). There was no significant difference and regularity about the light compensation point (PLC) and dark respiration rate (Rd). To improve the quality of poplar seedlings, water and fertilizer were not the more the better. Keeping soil water as 80%-85% of field water holding capacity and applying compound fertilizer 15 g with one plant from May to July could effectively increase the number of leaves, enhance the ability of leaf to adapt to strong light and photosynthetic potential, and enhance the growth advantage. [ABSTRACT FROM AUTHOR]

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Urbanization is the carrier of urban informal economy development and one of the important factors affecting informal employment. This paper adopts the inter-provincial panel data from 2006 to 2017, and uses the adjacent-matrix and geographical distance matrix to con‐ struct the Spatial Durbin Model (SDM), and empirically analyzes the impact of urbanization de‐ velopment on informal employment and its mechanism. It is found that urbanization can signifi‐ cantly promote informal employment through direct effect and spatial spillover effect. Among them, the direct effect mainly through agglomeration effect, space effect and investment effect to directly promote the informal employment in the region. At the same time, the urbanization development of synergies between neighborhood, which makes the regional urbanization devel‐ opment of informal employment has a significant positive spillover effects. Compared with the border region, the spillover effect of geographically close regions is stronger. Further research shows that government competition between provinces plays a strong mediating role in the spa‐ tial spillover effect of urbanization development on informal employment and is an important factor that produces such spatial spillover effect. [ABSTRACT FROM AUTHOR]

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摘要:目的分析重症新型冠状病毒感染并发急性肾损伤(AKI)的危险因素及其预测效能。方法128例新型 冠状病毒感染患者根据是否并发AKI分为AKI组(50例)和非AKI组(78例),采用单因素分析法和多因素 Logistic回 归分析法分析重症新型冠状冠感染并发AKI的影响因素和危险因素,采用ROC曲线评估相关危险因素对重症新型 冠状病毒感染并发AKI的预测效能。结果 AKI组和非AKI组年龄、男性比例、合并症(高血压、糖尿病、冠心病)、 NLR、PCT、NGAL､D-D､APACHEII评分比较,P均<0.05;多因素 Logistic回归分析结果显示,PCT、NGAL､APACHE II 评分是重症新型冠状病毒感染并发AKI的独立危险因素。PCT预测临界值为9.16ng/mL,其预测重症新型冠状病 毒感染并发AKI的灵敏度为82%,特异度为100%;NGAL预测临界值为387.00ng/mL,其预测重症新型冠状病毒感 染并发AKI的灵敏度为90.0%,特异度为97.4%;APACHEII评分预测临界值为23.00分,其预测重症新型冠状病毒 感染并发AKI的灵敏度为58.0%,特异度为89.74%;PCTNGAL、APACHEII评分联合预测临界值为0.38,其预测 重症新型冠状病毒感染并发AKI的灵敏度为92.0%,特异度为98.72%。结论 PCT、NGAL、APACHE II评分是重症 新型冠状病毒感染并发AKI的危险因素,各指标对于重症新型冠状病毒感染并发AKI的发生有良好的预测效能,三 者联合具有更准确的预测价值。 [ABSTRACT FROM AUTHOR]