In order to study the profile control characteristics of emulsions in porous medium, the heterogeneous experimental model was established, by which the experimental scheme was designed with different permeabilities, m...In order to study the profile control characteristics of emulsions in porous medium, the heterogeneous experimental model was established, by which the experimental scheme was designed with different permeabilities, matching degree of particle size and concentration of emulsions. Based on experimental results of physical simulation, the concept of distributing rate and changing coefficient was introduced to quantitatively evaluate the profile control characteristics of emulsions. The results of the study show that, as the permeability ratio and emulsion concentration increase, the profile control characteristics of emulsions will enhance. The profile control characteristics of emulsions will be the best. The profile control scheme with emulsions was implemented in Bohai X oil field, The research results can be used for reference to design the profile control scheme in Bohai heterogeneous reservoir.展开更多
We determined a suitable amount of fertilizer for konara oak（Quercus serrata） and Japanese zelkova（Zelkova serrata） planted in a harvested pitch pine（Pinus rigida） plantation. Two-year-old bare-root seedlings of...We determined a suitable amount of fertilizer for konara oak（Quercus serrata） and Japanese zelkova（Zelkova serrata） planted in a harvested pitch pine（Pinus rigida） plantation. Two-year-old bare-root seedlings of konara oak and one-year-old containerized seedlings of Japanese zelkova were planted in April 2011. Three plots were established for each tree species to evaluate each of three fertilization applications. Solid compound fertilizer（N：P：K = 3：4：1） was applied yearly in three amounts（control： no fertilization, F1： 180 kg ha-1, and F2：360 kg ha-1）, every May from 2011 to 2013. We measured the root collar diameter and height, and analyzed the compartmental N and P concentrations. Compartmental N concentrations of konara oak and Japanese zelkova were not consistent based on amount of fertilization. However,the compartmental P concentrations of konara oak and Japanese zelkova were significantly different in the order of F2, F1, and control. Although the differences in growth of konara oak appeared after 3 years of fertilization,Japanese zelkova showed differences after only 2 years of fertilization owing to differences in seedling type. Growth of konara oak was affected by fertilization at F1 and F2 in2013. However, growth of Japanese zelkova was affected only at F2. Nutrient demand of Japanese zelkova appeard to be higher than that of konara oak, at least during the early growing period. Results from this study could be practically used in harvested pitch pine plantations to determine appropriate fertilization regimes.展开更多
目的探讨老年脑梗死患者跌倒预防知识-信念-行为(knowledge,attitude and practice,KAP)的潜在类别及其影响因素。方法选取2022年1月-2023年6月滨州医学院附属医院神经内科收治的老年脑梗死患者231例作为调查对象,采用基本情况问卷、领...目的探讨老年脑梗死患者跌倒预防知识-信念-行为(knowledge,attitude and practice,KAP)的潜在类别及其影响因素。方法选取2022年1月-2023年6月滨州医学院附属医院神经内科收治的老年脑梗死患者231例作为调查对象,采用基本情况问卷、领悟社会支持量表、医院焦虑抑郁量表、中国版日常生活活动能力量表、老年病人参与跌倒预防知信行量表对其进行调查,采用Mplus 8.3软件对其跌倒预防KAP进行潜在剖面分析,并分析不同类别的老年脑梗死患者KAP的影响因素。结果老年脑梗死患者跌倒预防KAP得分为(96.48±23.15)分。通过潜在剖面分析,将老年脑梗死患者依据跌倒预防KAP水平分为低KAP型(9.96%)、低知识KAP型(13.85%)、中KAP型(67.97%)和高KAP型(8.22%)。无序多分类Logistic回归结果显示,年龄、文化程度、领悟社会支持、焦虑、抑郁和失能程度是老年脑梗死患者跌倒预防KAP的独立影响因素。结论老年脑梗死患者跌倒预防KAP水平较低,受到年龄、文化程度、领悟社会支持、焦虑、抑郁和失能程度影响,应结合不同跌倒预防KAP类别的老年脑梗死患者进行相应健康教育。展开更多
This work is an improvement of the theory proposed by Qin Guogang and C. T. Sah for determination of deep level profiles in the multi-level ease. The previous theory cannot be applied to the ease when a level whose de...This work is an improvement of the theory proposed by Qin Guogang and C. T. Sah for determination of deep level profiles in the multi-level ease. The previous theory cannot be applied to the ease when a level whose density is comparable to the carrier density exists between the Fermi level and the deep level under study or when the deep level under study locates near the middle of the forbidden gap. The present work has overcome those restrictions so that it is applicable to more general cases. For the proton-implanted CZ-Si sample, the density profile of E(0.22), second acceptor level of divacancies, has been calculated in the presence of highly concentrated oxygen-vacancy level E(0.15) and has been compared with the profile of the same level E(0.22) calculated without considering the existence of E(0.15).展开更多
文摘In order to study the profile control characteristics of emulsions in porous medium, the heterogeneous experimental model was established, by which the experimental scheme was designed with different permeabilities, matching degree of particle size and concentration of emulsions. Based on experimental results of physical simulation, the concept of distributing rate and changing coefficient was introduced to quantitatively evaluate the profile control characteristics of emulsions. The results of the study show that, as the permeability ratio and emulsion concentration increase, the profile control characteristics of emulsions will enhance. The profile control characteristics of emulsions will be the best. The profile control scheme with emulsions was implemented in Bohai X oil field, The research results can be used for reference to design the profile control scheme in Bohai heterogeneous reservoir.
基金supported by the Research Fellowship of the Korea Forest Research Institute in 2013
文摘We determined a suitable amount of fertilizer for konara oak（Quercus serrata） and Japanese zelkova（Zelkova serrata） planted in a harvested pitch pine（Pinus rigida） plantation. Two-year-old bare-root seedlings of konara oak and one-year-old containerized seedlings of Japanese zelkova were planted in April 2011. Three plots were established for each tree species to evaluate each of three fertilization applications. Solid compound fertilizer（N：P：K = 3：4：1） was applied yearly in three amounts（control： no fertilization, F1： 180 kg ha-1, and F2：360 kg ha-1）, every May from 2011 to 2013. We measured the root collar diameter and height, and analyzed the compartmental N and P concentrations. Compartmental N concentrations of konara oak and Japanese zelkova were not consistent based on amount of fertilization. However,the compartmental P concentrations of konara oak and Japanese zelkova were significantly different in the order of F2, F1, and control. Although the differences in growth of konara oak appeared after 3 years of fertilization,Japanese zelkova showed differences after only 2 years of fertilization owing to differences in seedling type. Growth of konara oak was affected by fertilization at F1 and F2 in2013. However, growth of Japanese zelkova was affected only at F2. Nutrient demand of Japanese zelkova appeard to be higher than that of konara oak, at least during the early growing period. Results from this study could be practically used in harvested pitch pine plantations to determine appropriate fertilization regimes.
文摘目的探讨老年脑梗死患者跌倒预防知识-信念-行为(knowledge,attitude and practice,KAP)的潜在类别及其影响因素。方法选取2022年1月-2023年6月滨州医学院附属医院神经内科收治的老年脑梗死患者231例作为调查对象,采用基本情况问卷、领悟社会支持量表、医院焦虑抑郁量表、中国版日常生活活动能力量表、老年病人参与跌倒预防知信行量表对其进行调查,采用Mplus 8.3软件对其跌倒预防KAP进行潜在剖面分析,并分析不同类别的老年脑梗死患者KAP的影响因素。结果老年脑梗死患者跌倒预防KAP得分为(96.48±23.15)分。通过潜在剖面分析,将老年脑梗死患者依据跌倒预防KAP水平分为低KAP型(9.96%)、低知识KAP型(13.85%)、中KAP型(67.97%)和高KAP型(8.22%)。无序多分类Logistic回归结果显示,年龄、文化程度、领悟社会支持、焦虑、抑郁和失能程度是老年脑梗死患者跌倒预防KAP的独立影响因素。结论老年脑梗死患者跌倒预防KAP水平较低,受到年龄、文化程度、领悟社会支持、焦虑、抑郁和失能程度影响,应结合不同跌倒预防KAP类别的老年脑梗死患者进行相应健康教育。
基金The project supported by the National Natural Science Foundation of China.
文摘This work is an improvement of the theory proposed by Qin Guogang and C. T. Sah for determination of deep level profiles in the multi-level ease. The previous theory cannot be applied to the ease when a level whose density is comparable to the carrier density exists between the Fermi level and the deep level under study or when the deep level under study locates near the middle of the forbidden gap. The present work has overcome those restrictions so that it is applicable to more general cases. For the proton-implanted CZ-Si sample, the density profile of E(0.22), second acceptor level of divacancies, has been calculated in the presence of highly concentrated oxygen-vacancy level E(0.15) and has been compared with the profile of the same level E(0.22) calculated without considering the existence of E(0.15).
