抽水蓄能作为电力系统中最为成熟的新能源储能技术,凭借其能调节电网负荷、平衡电力波动及提升系统稳定性的独特优势,已成为实现中国“双碳”目标的重要路径之一。因此,对抽水蓄能电站综合效益进行科学评估,是项目决策及政策制定中至关...抽水蓄能作为电力系统中最为成熟的新能源储能技术,凭借其能调节电网负荷、平衡电力波动及提升系统稳定性的独特优势,已成为实现中国“双碳”目标的重要路径之一。因此,对抽水蓄能电站综合效益进行科学评估,是项目决策及政策制定中至关重要的一环。为此,本文提出一种基于博弈论组合赋权‒云模型的综合效益评价模型。首先,运用社会网络分析法(SNA)筛选关键评价指标,构建包含财务评价、国民经济评价、技术效益、动态效益、静态效益、电网效益、综合可持续性效益和社会效益8个1级指标及其下属30个2级指标的评价指标体系。其次,采用序关系分析(G1)法和CRITIC(criteria importance through intercriteria correlation)法相结合的方式,对各评价指标进行主观与客观权重赋值。通过引入博弈论组合赋权方法,进一步优化各指标的权重分配。最终,基于云模型构建综合效益评价模型。利用博弈论组合赋权‒云模型对紫云山抽水蓄能电站进行实例分析,结果表明,该电站的综合效益评估等级为“好”,与实际情况相符,充分验证了所构建模型的有效性与准确性。该研究不仅为抽水蓄能电站的综合效益评估提供了科学的评估框架,并为类似项目的决策和实施提供了理论支持和实践依据。展开更多
背景:近期研究表明,肠道菌群可能会影响肌萎缩侧索硬化症的发展进程,然而两者之间的因果关系尚不清楚。目的:利用孟德尔随机化方法探索肠道菌群与肌萎缩侧索硬化症之间的因果关系。方法:从IEU Open GWAS数据库(由英国布里斯托尔大学的...背景:近期研究表明,肠道菌群可能会影响肌萎缩侧索硬化症的发展进程,然而两者之间的因果关系尚不清楚。目的:利用孟德尔随机化方法探索肠道菌群与肌萎缩侧索硬化症之间的因果关系。方法:从IEU Open GWAS数据库(由英国布里斯托尔大学的英国医学研究委员会和遗传流行病学研究所开发,旨在提供与多种疾病相关的全基因组关联研究数据,为开放数据库)中分别获取肠道菌群和肌萎缩侧索硬化症的GWAS数据,以肠道菌群为暴露因素、肌萎缩侧索硬化症为结局变量,使用逆方差加权法、MR-Egger回归法、加权中位数法、加权模型法和简单模型法来探究两者之间的因果关系。使用敏感性分析检验孟德尔随机化结果的可靠性,使用反向孟德尔随机化分析进一步验证两者间的因果关系。结果与结论:(1)正向孟德尔随机化分析结果表明,6种肠道菌群与肌萎缩侧索硬化症之间存在因果关系,其中嗜胆菌属(β=0.206,OR=1.229)、毛螺菌属(β=0.288,OR=1.333)、马文-布莱恩特氏菌属(β=0.196,OR=1.216)、瘤胃球菌UCG010属(β=0.254,OR=1.289)和泰泽氏菌属3型(β=0.128,OR=1.136)可能是肌萎缩侧索硬化症的潜在危险因素,肠杆菌属(β=-0.203,OR=0.816)可能是肌萎缩侧索硬化症的保护因素;(2)在敏感性分析中,未发现显著的异质性和水平多效性(P均> 0.05),反向孟德尔随机化分析亦未揭示肠道菌群与肌萎缩侧索硬化症之间存在反向因果关系;(3)该研究结果不仅为肌萎缩侧索硬化症治疗提供了潜在的生物标志物,还为开发基于肠道菌群的新的干预治疗方案提供了理论依据,对中国基础医学研究具有一定的启示意义。展开更多
Based on drilling, logging, test production and dynamic monitoring data, the control effects of low-amplitude structure on hydrocarbon accumulation and development performance of ultra-low permeability reservoirs were...Based on drilling, logging, test production and dynamic monitoring data, the control effects of low-amplitude structure on hydrocarbon accumulation and development performance of ultra-low permeability reservoirs were discussed by using the methods of dense well pattern, multi-factor geological modeling, macro and micro analysis and static and dynamic analysis. The results show that the low-amplitude structure always had a significant control and influence on the distribution and accumulation of original hydrocarbon and water and the evolution trend of water flooding performance in ultra-low permeability reservoirs, and it was not only the direction of oil and gas migration, but also a favorable place for relative accumulation of oil and gas. The controlling effect of low-amplitude structure on ultra-low permeability reservoir mainly depended on its tectonic amplitude and scale;the larger the tectonic amplitude and scale, and the higher the tectonic position of the low amplitude structure, the better the reservoir characteristic parameters, oil and gas enrichment degree and development effect, and the larger the spatial scope it controlled and influenced;water cut and oil well output always fluctuated orderly with the height of the low-amplitude structure;the dynamic response of waterflooding was closely related to the relative structural position of the injection and production wells;the injected water always advanced to the low-lying area of the structure first and then moved up to the high-lying area of the structure gradually;with the continuous expansion of the flooded area, part of the oil and gas in the low-lying part of the structure was forced to be distributed to the high part of the structure, resulting in a new oil and gas enrichment, so that the dynamic reserves of oil wells in the high part increased, and the production capacity remained stable.展开更多
光学电流互感器具有测量精度高、结构简单、安全性高等特点,其关键组件光纤复合绝缘子承担着通信和电气绝缘的双重作用。然而,现有不同光纤植入型式的光纤复合绝缘子芯体存在相应材料、结构或工艺等缺陷,光纤与绝缘材料之间易产生界面隐...光学电流互感器具有测量精度高、结构简单、安全性高等特点,其关键组件光纤复合绝缘子承担着通信和电气绝缘的双重作用。然而,现有不同光纤植入型式的光纤复合绝缘子芯体存在相应材料、结构或工艺等缺陷,光纤与绝缘材料之间易产生界面隐患,威胁电气设备安全运行。该文提出采用低密度环氧基复合泡沫作为光纤芯体基体,植入聚乙烯型低烟无卤(low smoke zero halogen polyethylene,LSZHPE)、聚乙烯-四氟乙烯(ethylene-tetrafluoroethylene copolymer,ETFE)及裸纤3种光纤,对比分析不同类型光纤芯体物理、界面、电气等关键性能。结果表明:LSZHPE光纤体系芯体具有较优的综合性能,150 h水扩散泄漏电流低于100μA,界面击穿强度达到13.34 k V/mm,同时光纤植入后光导通损耗满足实际应用要求;ETFE光纤及裸纤体系芯体电气性能良好,但受限于材料自身特性,界面剪切强度较低,界面可靠性相对较差。该研究为光纤复合绝缘子材料选型、界面评估及结构优化提供了新思路。展开更多
文摘抽水蓄能作为电力系统中最为成熟的新能源储能技术,凭借其能调节电网负荷、平衡电力波动及提升系统稳定性的独特优势,已成为实现中国“双碳”目标的重要路径之一。因此,对抽水蓄能电站综合效益进行科学评估,是项目决策及政策制定中至关重要的一环。为此,本文提出一种基于博弈论组合赋权‒云模型的综合效益评价模型。首先,运用社会网络分析法(SNA)筛选关键评价指标,构建包含财务评价、国民经济评价、技术效益、动态效益、静态效益、电网效益、综合可持续性效益和社会效益8个1级指标及其下属30个2级指标的评价指标体系。其次,采用序关系分析(G1)法和CRITIC(criteria importance through intercriteria correlation)法相结合的方式,对各评价指标进行主观与客观权重赋值。通过引入博弈论组合赋权方法,进一步优化各指标的权重分配。最终,基于云模型构建综合效益评价模型。利用博弈论组合赋权‒云模型对紫云山抽水蓄能电站进行实例分析,结果表明,该电站的综合效益评估等级为“好”,与实际情况相符,充分验证了所构建模型的有效性与准确性。该研究不仅为抽水蓄能电站的综合效益评估提供了科学的评估框架,并为类似项目的决策和实施提供了理论支持和实践依据。
文摘背景:近期研究表明,肠道菌群可能会影响肌萎缩侧索硬化症的发展进程,然而两者之间的因果关系尚不清楚。目的:利用孟德尔随机化方法探索肠道菌群与肌萎缩侧索硬化症之间的因果关系。方法:从IEU Open GWAS数据库(由英国布里斯托尔大学的英国医学研究委员会和遗传流行病学研究所开发,旨在提供与多种疾病相关的全基因组关联研究数据,为开放数据库)中分别获取肠道菌群和肌萎缩侧索硬化症的GWAS数据,以肠道菌群为暴露因素、肌萎缩侧索硬化症为结局变量,使用逆方差加权法、MR-Egger回归法、加权中位数法、加权模型法和简单模型法来探究两者之间的因果关系。使用敏感性分析检验孟德尔随机化结果的可靠性,使用反向孟德尔随机化分析进一步验证两者间的因果关系。结果与结论:(1)正向孟德尔随机化分析结果表明,6种肠道菌群与肌萎缩侧索硬化症之间存在因果关系,其中嗜胆菌属(β=0.206,OR=1.229)、毛螺菌属(β=0.288,OR=1.333)、马文-布莱恩特氏菌属(β=0.196,OR=1.216)、瘤胃球菌UCG010属(β=0.254,OR=1.289)和泰泽氏菌属3型(β=0.128,OR=1.136)可能是肌萎缩侧索硬化症的潜在危险因素,肠杆菌属(β=-0.203,OR=0.816)可能是肌萎缩侧索硬化症的保护因素;(2)在敏感性分析中,未发现显著的异质性和水平多效性(P均> 0.05),反向孟德尔随机化分析亦未揭示肠道菌群与肌萎缩侧索硬化症之间存在反向因果关系;(3)该研究结果不仅为肌萎缩侧索硬化症治疗提供了潜在的生物标志物,还为开发基于肠道菌群的新的干预治疗方案提供了理论依据,对中国基础医学研究具有一定的启示意义。
基金Supported by Open Fund(PLC20190203)of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(Chengdu University of Technology)the Natural Science Foundation of Shaanxi Province,China(2006Z07,2010JM5003)Youth Science and Technology Innovation Fund Project of Xi’an Petroleum University(2012BS010)
文摘Based on drilling, logging, test production and dynamic monitoring data, the control effects of low-amplitude structure on hydrocarbon accumulation and development performance of ultra-low permeability reservoirs were discussed by using the methods of dense well pattern, multi-factor geological modeling, macro and micro analysis and static and dynamic analysis. The results show that the low-amplitude structure always had a significant control and influence on the distribution and accumulation of original hydrocarbon and water and the evolution trend of water flooding performance in ultra-low permeability reservoirs, and it was not only the direction of oil and gas migration, but also a favorable place for relative accumulation of oil and gas. The controlling effect of low-amplitude structure on ultra-low permeability reservoir mainly depended on its tectonic amplitude and scale;the larger the tectonic amplitude and scale, and the higher the tectonic position of the low amplitude structure, the better the reservoir characteristic parameters, oil and gas enrichment degree and development effect, and the larger the spatial scope it controlled and influenced;water cut and oil well output always fluctuated orderly with the height of the low-amplitude structure;the dynamic response of waterflooding was closely related to the relative structural position of the injection and production wells;the injected water always advanced to the low-lying area of the structure first and then moved up to the high-lying area of the structure gradually;with the continuous expansion of the flooded area, part of the oil and gas in the low-lying part of the structure was forced to be distributed to the high part of the structure, resulting in a new oil and gas enrichment, so that the dynamic reserves of oil wells in the high part increased, and the production capacity remained stable.
文摘光学电流互感器具有测量精度高、结构简单、安全性高等特点,其关键组件光纤复合绝缘子承担着通信和电气绝缘的双重作用。然而,现有不同光纤植入型式的光纤复合绝缘子芯体存在相应材料、结构或工艺等缺陷,光纤与绝缘材料之间易产生界面隐患,威胁电气设备安全运行。该文提出采用低密度环氧基复合泡沫作为光纤芯体基体,植入聚乙烯型低烟无卤(low smoke zero halogen polyethylene,LSZHPE)、聚乙烯-四氟乙烯(ethylene-tetrafluoroethylene copolymer,ETFE)及裸纤3种光纤,对比分析不同类型光纤芯体物理、界面、电气等关键性能。结果表明:LSZHPE光纤体系芯体具有较优的综合性能,150 h水扩散泄漏电流低于100μA,界面击穿强度达到13.34 k V/mm,同时光纤植入后光导通损耗满足实际应用要求;ETFE光纤及裸纤体系芯体电气性能良好,但受限于材料自身特性,界面剪切强度较低,界面可靠性相对较差。该研究为光纤复合绝缘子材料选型、界面评估及结构优化提供了新思路。
