边坡的稳定性常常受到诸多因素的影响,在这些因素的影响下容易出现坡体向下滑动或碎石掉落等现象,极大影响安全生产。运用灰靶模型对边坡的稳定性进行研究,在综合考虑内外因素的影响下,选取黏聚力(c)、内摩擦角(?)、边坡角(α)、边坡高...边坡的稳定性常常受到诸多因素的影响,在这些因素的影响下容易出现坡体向下滑动或碎石掉落等现象,极大影响安全生产。运用灰靶模型对边坡的稳定性进行研究,在综合考虑内外因素的影响下,选取黏聚力(c)、内摩擦角(?)、边坡角(α)、边坡高度(h)、天然容重(γ)作为样本数据的评价指标,运用Criteria Importance Through Intercriteria Correlation(CRITIC)法计算样本数据的客观权重,利用序关系分析(G1)法计算样本数据的主观权重,最后,使用博弈组合赋权法对CRITIC法和G1法计算的样本数据权重进行组合赋权,找出样本数据的综合最优权重。结合灰靶理论,建立了不同边坡等级的靶心距范围集,为了验证所建立的组合赋权-灰靶模型的可靠性,将该模型应用到某露天矿的边坡稳定性分析评价中。研究结果表明:基于组合赋权-灰靶模型的边坡稳定性评价结果与实际边坡稳定性等级基本一致,证明该边坡等级评价模型具有较好的实用性和可靠性。展开更多
战场抢修是一线部队战时有效保持与快速恢复装备战术状态以确保战斗力的重要手段。不同作战阶段,抢修分队的具体部署位置不仅直接影响自身安全,还直接影响抢修任务的完成时效。通过分析装备抢修分队选址的影响因素,构建了选址决策评估...战场抢修是一线部队战时有效保持与快速恢复装备战术状态以确保战斗力的重要手段。不同作战阶段,抢修分队的具体部署位置不仅直接影响自身安全,还直接影响抢修任务的完成时效。通过分析装备抢修分队选址的影响因素,构建了选址决策评估指标体系;利用序关系分析法(G1法)和CRITIC法(Criteria Importance Through Intercriteria Correlation)的组合赋权法确定指标权重;采用云模型确定各参训人员的选址决策等级,并分析其优劣性。以相同仿真条件下的三组选址方案为例,对各参训人员的选址决策能力进行科学评估。该方法为战时装备抢修阶段性能力评估提供了新思路。展开更多
Pollen development is a,pre-requisite for sexual reproduction of angiosperms, during which various cellular activities are involved. Pollen development accompanies dynamic remodeling of vacuoles through fission and fu...Pollen development is a,pre-requisite for sexual reproduction of angiosperms, during which various cellular activities are involved. Pollen development accompanies dynamic remodeling of vacuoles through fission and fusion, disruption of which often compromises pollen viability. We previously reported that the Y subunit of adaptor protein 1 （AP1G） mediates synergid degeneration during pollen tube reception. Here, we demonstrate that AP1G is essential for pollen development. AP1G loss-of-function resulted in male gametophytic lethality due to defective pollen development. By ultrastructural analysis and fluorescence labeling, we demonstrate that AP1G loss-of-function compromised dynamic vacuolar remodeling during pollen development and impaired vacuolar acidification of pollen. Results presented here support a key role of vacuoles in gametophytic pollen development.展开更多
文摘边坡的稳定性常常受到诸多因素的影响,在这些因素的影响下容易出现坡体向下滑动或碎石掉落等现象,极大影响安全生产。运用灰靶模型对边坡的稳定性进行研究,在综合考虑内外因素的影响下,选取黏聚力(c)、内摩擦角(?)、边坡角(α)、边坡高度(h)、天然容重(γ)作为样本数据的评价指标,运用Criteria Importance Through Intercriteria Correlation(CRITIC)法计算样本数据的客观权重,利用序关系分析(G1)法计算样本数据的主观权重,最后,使用博弈组合赋权法对CRITIC法和G1法计算的样本数据权重进行组合赋权,找出样本数据的综合最优权重。结合灰靶理论,建立了不同边坡等级的靶心距范围集,为了验证所建立的组合赋权-灰靶模型的可靠性,将该模型应用到某露天矿的边坡稳定性分析评价中。研究结果表明:基于组合赋权-灰靶模型的边坡稳定性评价结果与实际边坡稳定性等级基本一致,证明该边坡等级评价模型具有较好的实用性和可靠性。
文摘战场抢修是一线部队战时有效保持与快速恢复装备战术状态以确保战斗力的重要手段。不同作战阶段,抢修分队的具体部署位置不仅直接影响自身安全,还直接影响抢修任务的完成时效。通过分析装备抢修分队选址的影响因素,构建了选址决策评估指标体系;利用序关系分析法(G1法)和CRITIC法(Criteria Importance Through Intercriteria Correlation)的组合赋权法确定指标权重;采用云模型确定各参训人员的选址决策等级,并分析其优劣性。以相同仿真条件下的三组选址方案为例,对各参训人员的选址决策能力进行科学评估。该方法为战时装备抢修阶段性能力评估提供了新思路。
基金supported by Major Research Plan(2013CB945102)from the Ministry of Science,Technology of ChinaNational Natural Science Foundation of China(31625003 and 31471304 to Y.Z.)partially supported by Tai-Shan Scholar Program by Shandong Provincial Government
文摘Pollen development is a,pre-requisite for sexual reproduction of angiosperms, during which various cellular activities are involved. Pollen development accompanies dynamic remodeling of vacuoles through fission and fusion, disruption of which often compromises pollen viability. We previously reported that the Y subunit of adaptor protein 1 （AP1G） mediates synergid degeneration during pollen tube reception. Here, we demonstrate that AP1G is essential for pollen development. AP1G loss-of-function resulted in male gametophytic lethality due to defective pollen development. By ultrastructural analysis and fluorescence labeling, we demonstrate that AP1G loss-of-function compromised dynamic vacuolar remodeling during pollen development and impaired vacuolar acidification of pollen. Results presented here support a key role of vacuoles in gametophytic pollen development.
