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针对中国第一个海上风电柔性直流送出工程—江苏如东工程，从系统拓扑方案构建、过电压与绝缘配合、系统功率盈余问题与交流故障穿越技术以及控制保护技术等方面开展了深入研究，构建了轻型紧凑化的海上风电柔性直流系统拓扑方案，取消了海上换流站的启动回路与接地回路等；提出了海陆换流站的避雷器配置方案与参考电压的选取原则，形成了海陆换流站的绝缘配合方案的典型范式；提出了集中式、分布式、混合式直流侧有功功率动态平衡装置的典型拓扑方式，解决了陆上换流站交流侧故障穿越难题；提出了工程的整体控制保护方案，并研究了一种基于电压前馈环节比例谐振控制的有源谐振抑制方法，显著降低了工程的振荡风险。通过工程实际运行，全面验证了所提技术的有效性。

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张北柔性直流电网试验示范工程（简称张北工程）将建成世界上首个直流电网，该工程4个换流站采用手拉手环网结构，具有多回路冗余特性，可以实现新能源孤岛接入、多电源供电、多能互补，形成了真正意义上的直流电网。针对张北工程直流电网特点，确定了控制保护系统的难点与主要设计原则，提出了针对直流电网的多换流站协调控制、换流器自适应控制等关键控制策略以及直流保护配置，最后通过硬件闭环实时仿真验证了控制保护系统设计的合理性。

A new maize variety Tianrun 189 was selected as experimental material, and a two-factor split plot design was adopted. Three treat- ments of density level were set up(Al treatment 42 000 plants/hm²; A2 treatment 48 000 plants/hm²; A3 treatment, 54 000 plants/hm²). 4 fertilizer application level treatments were as follows: B1 was treated with conventional fertilizer, 750 kg/hm² compound fertilizer and 150 kg/hm² urea; B2, B3 and B4 treatments were treated with slow-release fertilizer 600,750 and 900 kg/hm², respectively. The main agro- nomic characters, yield and economic benefit of maize variety Tianrun 189 under 3 densities and 4 fertilization levels were studied. Results showed that planting density, fertilizer amount and interaction between fertilizer amount and planting density had significant or extremely signifi- cant effects on plant characters, ear traits and yield. Under different planting densities, A3 had the highest yield of Tianrun 189, was significant or extremely significant higher than treatment Al, but showed no significant differences with A2 treatment. Under different fertilization amount, B4 treatment had the highest yield of Tianrun 189, was extremely higher than B2 treatment, but had no significant differences with B3 and B1. Under the interaction between fertilizer amount and planting density, A3B1 treatment had the highest yield in spring sowing, which reached 8 494.50 kg/hm and was significantly higher than A3B2 treatment. But A3B4 and A3B3 treatments had no significant differences. In autumn sowing, A3B4 treatment had the highest yield (8276.50 kg/hm²) but had no significant differences with A3B1 and A3B3 treatments. Accord- ing to the economic benefits, benefits of B2, B3 and B4 treatments were all higher than normal application treatment B1, and B3 treatment had the highest benefit, reaching 12 353.59 Yuan/hm², was 10.77% higher than B1 treatment. In general, proper density of Tianrun 189 was 48 000-54 000 plants/hm². Under this density, applying 750-900 kg/hm² slow release compound fertilizer (N-P2O5-K2O=24-6-10) could obtain better yield and economic benefit. [ABSTRACT FROM AUTHOR]

In order to optimize the formula of kiwi fruit pulp beverage based on ultra-high pressure treatment, the forced stratification rate was used as an indicator in this study, single factor tests and response surface experiments were performed to optimiz the formula. The results showed that the amount of kiwi fruit puree was 47%, the addition of sucrose was 12%, and the thickener was 0. 14%. After ultra-high-tech treatment, the forced delamination rate can reach to a good ratio of 47%. The color and particle size of the optimized products indicated that L value was 38 and ΔE was less than 2, the color of the product was bright and uniform. The particle size of volume average D[4, 3] was 214 μm. The product showed good stability. [ABSTRACT FROM AUTHOR]

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The complex internal characteristics and external environment of the sustainable supply chain of water transfer projects have increased the difficulty of governing sudden water pollution. A reasonable collaborative management model can improve the effectiveness of handling sudden water pollution incidents. Based on the integration of synergetic theory and actor network theory, by analyzing the composition of participants and multi-dimensional interest demands of collaborative management of sustainable supply chain for water transfer projects in sudden water pollution incidents, determined the mandatory passage point of “collaborative management”, and explored the operating environment and the interest coordination system structure of the participants. And based on the translation process of problem presentation, benefit collaboration and recruitment, it built a model for collaborative management of the sustainable supply chain of multi-subject participation in the coordination of multi-dimensional benefits for sudden water pollution incidents of water transfer projects. Through the collaborative management model, the collaborative management value recognition of the public, enterprises and other subjects under sudden water pollution can be activated, the collaborative value of each subject can be brought into play, the collaborative management ability of sudden water pollution incidents of water transfer projects can be enhanced, and the sustainable benefits of water transfer projects can be promoted stably. [ABSTRACT FROM AUTHOR]

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【目的】 探讨白内障超声乳化及后房型人工晶状体植入术的临床效果? 【方法】 对613例年龄在45 ～ 98岁老年性白内障进行超声乳化联合人工晶状体植入术,术后随诊2周至3月,观察视力,术中,术后并发症? 【结果】 术后1天,1周,3个月视力≥0.5者分别为25%,58%,87.3%(除外眼底病者)?术中,术后并发症为角膜水肿,后发性白内障,后囊破裂及虹膜脱出,玻璃体脱出,并随着经验的积累而明显减少?【结论】 白内障超声乳化联合人工晶状体植入术,具有术后早期反应轻及视力恢复快的优点,其成功的关键在于手术技巧和手术的熟练程度?

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The ecological footprint model of water resources was used to study the environmental carrying capacity of water resources in 115 cities in nine provinces and regions of the Yellow River Basin from 2010 to 2018 and the spatial and temporal characteristics of water resources in nine provinces and regions of the Yellow River Basin were discussed. The results show that the per capita ecological footprint of water resources in the nine provinces and regions of the Yellow River Basin is generally higher in the west and lower in the south. Only 28.7% of the cities in nine provinces and regions of the Yellow River Basin are in the state of ecological surplus of water resources. The water resources carrying capacity in the south of nine provinces and regions of the Yellow River Basin is high and the water resources carrying capacity in the east of Hu Huanyong line is similar to that in the west of Hu Huanyong line. The utilization rate of water resources in each city in nine provinces and regions of the Yellow River Basin has been increasing over the years. The average water resources pressure in the nine provinces and regions of the Yellow River Basin is increasing year by year. In general, the serious shortage of water resources and the uneven spatial and temporal distribution of water resources are the important factors restricting the high-quality development of the nine provinces and regions of the Yellow River Basin. [ABSTRACT FROM AUTHOR]

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