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杆件体系稳定性调整的快速解析研究 被引量:1
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作者 李彤 李银山 +1 位作者 霍树浩 官云龙 《起重运输机械》 2015年第9期36-42,共7页
结构稳定性临界力的计算,通常需要求解非线性超越方程组,常用的方法无法求得解析解。文中提出了一种计算压杆稳定临界力的连续分段独立一体化积分法。首先采用杆-梁比拟法建立具有四阶导数的挠度微分方程,独立积分4次,得到挠度的通解,... 结构稳定性临界力的计算,通常需要求解非线性超越方程组,常用的方法无法求得解析解。文中提出了一种计算压杆稳定临界力的连续分段独立一体化积分法。首先采用杆-梁比拟法建立具有四阶导数的挠度微分方程,独立积分4次,得到挠度的通解,再根据边界条件和连续性条件确定积分常数,得到挠度的解析表达式;然后根据最小能量原理得到临界力的一次近似解析解,再根据渐近法求解精确的压杆稳定微分方程得到更精确的挠度解析函数表达式,根据最小能量原理求得临界力的精确表达式。工程实例表明,连续分段独立一体化积分法编程程式化,可以得到压杆稳定临界力的最优解析解。 展开更多
关键词 定性调整 快速解析法 最小能量原理 渐近法 定性判断法
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基于行业维度的银行组合限额管理研究
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作者 张晓艳 《现代管理》 2020年第5期762-768,共7页
实现组合限额管理对银行贯彻风险偏好和战略意图,平衡风险、收益和资本以及健全全面风险管理体系具有重要意义。本文对如何开展行业组合限额管理进行了分析,即将行业维度的风险、收益与资本管理的要求作为目标条件,构建组合限额计量模型... 实现组合限额管理对银行贯彻风险偏好和战略意图,平衡风险、收益和资本以及健全全面风险管理体系具有重要意义。本文对如何开展行业组合限额管理进行了分析,即将行业维度的风险、收益与资本管理的要求作为目标条件,构建组合限额计量模型,根据各行业组合不同的风险、收益和资本占用特点选择最合适的授信额度配比,并进一步结合战略发展、银行资产质量、管理经验、历史限额占比等模型外因素,对组合限额设置结果进行修正。组合限额控制措施主要包括政策调整和资产组合再平衡两种,在日常的限额执行过程中,通过评估组合限额调整必要性后开展定期或不定期调整,保障满足授信需求的同时信贷资产得到充分有效的使用。 展开更多
关键词 组合限额管理 行业 计量模型 定性调整
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浅析中国童装市场的特点 被引量:1
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作者 李丰 《商场现代化》 北大核心 2008年第12期163-163,共1页
中国童装市场正步入飞速发展的阶段,市场的走向存在许多不确定因素;特别是中国加入WTO后,中国的童装业更加面临一个重新洗牌的格局;如何找准自己的定位,扩大自身的市场份额,是每个童装企业面临的问题。
关键词 童装市场 多元性 不穗定性调整 定位
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Research of Sail Height Adjustment on Sail-Assisted Ship in Different Loading and Wind Conditions
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作者 HE Jianhai HU Yihuai +1 位作者 TANG Juanjuan ZHANG Jianxia 《Journal of Shipping and Ocean Engineering》 2016年第6期313-322,共10页
The relationship between ship stability and sail area is firstly investigated based on the sail-assisted ship's stability in this paper. Then a height-adjustable sail structure is proposed that could be automatically... The relationship between ship stability and sail area is firstly investigated based on the sail-assisted ship's stability in this paper. Then a height-adjustable sail structure is proposed that could be automatically adjusted according to the wind conditions, ship loading and other requirements. The influences on the sail height in different ship load conditions, different wind apparent velocity and wind direction are analyzed of a sail-assisted bulk carrier. Finally a control procedure of sail height adjustment in real time is proposed according to the actual load conditions, wind conditions, ship velocity and other parameters to make the best use of wind energy, which is significant for the practical application of sail-assisting technology in the future. 展开更多
关键词 Sail height height adjustable wind influential factor control procedure.
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PCL2 regulates p53 stability and functions as a tumor suppressor in breast cancer 被引量:4
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作者 Yiran Liang Yang Yang +6 位作者 Renbo Guo Shuang Gao Xinghong Guo Danyang Li Meng Wang Haruhiko Koseki Xiangzhi Li 《Science Bulletin》 SCIE EI CSCD 2018年第10期629-639,共11页
Polycomblike2(PCL2) is a well-known component of polycomb repressive complex 2(PRC2) and plays important roles in H3 K27 methylation and homeotic gene silencing.However,the involvement of PCL2 in breast cancer develop... Polycomblike2(PCL2) is a well-known component of polycomb repressive complex 2(PRC2) and plays important roles in H3 K27 methylation and homeotic gene silencing.However,the involvement of PCL2 in breast cancer development remains unclear.Here,we established PCL2 as a tumor suppressor gene in breast cancer.Expression level of PCL2 was significantly downregulated in breast cancer tissue samples observed at different TNM stages.Ectopic expression of PCL2 could significantly inhibit cell proliferation and promoted apoptosis.PCL2 also remarkably elevated levels of p53 and its targets by increasing p53 stability.Mechanistically,PCL2 protected p53 proteins from MDM2-mediated ubiquitination and degradation by sequestering MDM2 into the nucleolus.Overexpression of PCL2 also suppressed migration and invasion by inhibiting epithelial-mesenchymal transition.PCL2 expression was correlated with Ecadherin expression and was inversely correlated with vimentin expression.Furthermore,PCL2 knockdown could attenuate anti-tumor effect of MLN4924.Taken together,our findings indicated that PCL2 played a tumor suppressor role in development and progression of breast cancer and may be a prognostic and predictive marker for breast cancer. 展开更多
关键词 Polycomb repressive complexes PCL2 p53 MDM2 Breast cancer
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Parametric sensitivity analysis of precipitation and temperature based on multi-uncertainty quantification methods in the Weather Research and Forecasting model 被引量:3
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作者 DI ZhenHua 《Science China Earth Sciences》 SCIE EI CAS CSCD 2017年第5期876-898,共23页
Sensitivity analysis(SA) has been widely used to screen out a small number of sensitive parameters for model outputs from all adjustable parameters in weather and climate models, helping to improve model predictions b... Sensitivity analysis(SA) has been widely used to screen out a small number of sensitive parameters for model outputs from all adjustable parameters in weather and climate models, helping to improve model predictions by tuning the parameters. However, most parametric SA studies have focused on a single SA method and a single model output evaluation function, which makes the screened sensitive parameters less comprehensive. In addition, qualitative SA methods are often used because simulations using complex weather and climate models are time-consuming. Unlike previous SA studies, this research has systematically evaluated the sensitivity of parameters that affect precipitation and temperature simulations in the Weather Research and Forecasting(WRF) model using both qualitative and quantitative global SA methods. In the SA studies, multiple model output evaluation functions were used to conduct various SA experiments for precipitation and temperature. The results showed that five parameters(P3, P5, P7, P10, and P16) had the greatest effect on precipitation simulation results and that two parameters(P7 and P10) had the greatest effect for temperature. Using quantitative SA, the two-way interactive effect between P7 and P10 was also found to be important, especially for precipitation. The microphysics scheme had more sensitive parameters for precipitation, and P10(the multiplier for saturated soil water content) was the most sensitive parameter for both precipitation and temperature. From the ensemble simulations, preliminary results indicated that the precipitation and temperature simulation accuracies could be improved by tuning the respective sensitive parameter values, especially for simulations of moderate and heavy rain. 展开更多
关键词 Multi-uncertainty quantification methods Qualitative parameters screening Quantitative sensitivity analysis Weather Research and Forecasting model
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