Nine targets which stand both for the static characteristic of produced formations and the dynamic parameter of wells including the average permeability,variation coefficient of permeability,moving capability,remainin...Nine targets which stand both for the static characteristic of produced formations and the dynamic parameter of wells including the average permeability,variation coefficient of permeability,moving capability,remaining recoverable reserves,coefficient of flooding,daily oil production,increasing rate of water cut,cumulative liquid production per unit meter and efficiency index of oil production are selected as the evaluation indexes,a novel model to evaluate the porous formations in long-term waterflooding sand reservoir was established by using the support vector machine and clustering analysis. Data of 57 wells from Shentuo 21 block Shengli oilfield was analyzed by using the model. Four kinds of formation groups were gained. According to the analysis result,different adjustment solutions were put forward to develop the relevant formations. The Monthly oil production increased 7.6 % and the water cut decreased 8.9 % after the adjusted solutions. Good results indicate that the learning from this method gained will be valuable adding to other long-term waterflooding sand reservoirs in Shengli oilfield and other similar reservoirs worldwide.展开更多
With the accelerating process of population aging in our country, the physical function of the elderly will decline, the possibility of suffering from acute and chronic diseases will increase, and the occurrence of di...With the accelerating process of population aging in our country, the physical function of the elderly will decline, the possibility of suffering from acute and chronic diseases will increase, and the occurrence of disability will become more common and normal. The potential demand for elderly care is rapidly increasing. With the growth, the care of the disabled elderly has become increasingly acute. At the same time, due to the intensification of family miniaturization and population migration, the traditional family-based long-term care has been difficult to sustain. How to incorporate long-term care into our social security system as soon as possible has become the focus of the whole society. The thesis through the combination of public policy simulation methods and the research data, the long-term care insurance system implemented at the beginning of 2018 in Shanghai is a policy blueprint. It uses statistical software SPSS, MATLAB, etc. to achieve data collation, analysis and prediction, and at the same time integrates the pilot of the long-term care insurance system. The implementation of policies in cities such as Qingdao and Nantong has been simulated. Finally, on the basis of simulation results, suggestions have been made for the future development of China＇s long-term care insurance system.展开更多
This paper mainly studies how investors invest in funds to obtain high returns while avoiding risks.Firstly,from the perspective of portfolio investment,this paper introduces the traditional Markowitz mean-variance mo...This paper mainly studies how investors invest in funds to obtain high returns while avoiding risks.Firstly,from the perspective of portfolio investment,this paper introduces the traditional Markowitz mean-variance model and capital asset pricing model(CAPM),then selects four funds from different industries by MATLAB program in Sina Finance and Economics Network for application analysis from which the optimal portfolio point can be obtained under the combination of efficient frontier and capital allocation line.Subsequently,by analyzing the returns of long-term holdings and short-term operations of Noan Growth Hybrid Fund,it is confirmed that long-term holding funds can better cope with the changing market so as to obtain more stable returns.Finally,this paper discusses the dynamic adjustments of asset portfolio.Resident investors are supposed to take into account the market situation and the changes of the fund itself to adjust the holding fund portfolio.Based on the research in this paper,resident investors ought to combine investment funds to diversify risk allocation and make long-term holding plans according to their risk tolerance.At the same time,they should also make appropriate dynamic adjustments when the external environment changes to ensure long-term benefits.展开更多
基金supported by funds from the Key Pro-ject of Chinese National Programs for Fundamental Research and Development (863 Program) under thenumber 2007AA090701the Young and Mid-dle-aged Researchers Innovation and Technology Foun-dation of CNPC under the number 04E7029
文摘Nine targets which stand both for the static characteristic of produced formations and the dynamic parameter of wells including the average permeability,variation coefficient of permeability,moving capability,remaining recoverable reserves,coefficient of flooding,daily oil production,increasing rate of water cut,cumulative liquid production per unit meter and efficiency index of oil production are selected as the evaluation indexes,a novel model to evaluate the porous formations in long-term waterflooding sand reservoir was established by using the support vector machine and clustering analysis. Data of 57 wells from Shentuo 21 block Shengli oilfield was analyzed by using the model. Four kinds of formation groups were gained. According to the analysis result,different adjustment solutions were put forward to develop the relevant formations. The Monthly oil production increased 7.6 % and the water cut decreased 8.9 % after the adjusted solutions. Good results indicate that the learning from this method gained will be valuable adding to other long-term waterflooding sand reservoirs in Shengli oilfield and other similar reservoirs worldwide.
文摘With the accelerating process of population aging in our country, the physical function of the elderly will decline, the possibility of suffering from acute and chronic diseases will increase, and the occurrence of disability will become more common and normal. The potential demand for elderly care is rapidly increasing. With the growth, the care of the disabled elderly has become increasingly acute. At the same time, due to the intensification of family miniaturization and population migration, the traditional family-based long-term care has been difficult to sustain. How to incorporate long-term care into our social security system as soon as possible has become the focus of the whole society. The thesis through the combination of public policy simulation methods and the research data, the long-term care insurance system implemented at the beginning of 2018 in Shanghai is a policy blueprint. It uses statistical software SPSS, MATLAB, etc. to achieve data collation, analysis and prediction, and at the same time integrates the pilot of the long-term care insurance system. The implementation of policies in cities such as Qingdao and Nantong has been simulated. Finally, on the basis of simulation results, suggestions have been made for the future development of China＇s long-term care insurance system.
基金Supported by the Ministry of Education Humanities and Social Sciences Research Youth Fund Project(No.17YJC790172)Yunnan Province Philosophy and Social Sciences Project(No.QN2017006).
文摘This paper mainly studies how investors invest in funds to obtain high returns while avoiding risks.Firstly,from the perspective of portfolio investment,this paper introduces the traditional Markowitz mean-variance model and capital asset pricing model(CAPM),then selects four funds from different industries by MATLAB program in Sina Finance and Economics Network for application analysis from which the optimal portfolio point can be obtained under the combination of efficient frontier and capital allocation line.Subsequently,by analyzing the returns of long-term holdings and short-term operations of Noan Growth Hybrid Fund,it is confirmed that long-term holding funds can better cope with the changing market so as to obtain more stable returns.Finally,this paper discusses the dynamic adjustments of asset portfolio.Resident investors are supposed to take into account the market situation and the changes of the fund itself to adjust the holding fund portfolio.Based on the research in this paper,resident investors ought to combine investment funds to diversify risk allocation and make long-term holding plans according to their risk tolerance.At the same time,they should also make appropriate dynamic adjustments when the external environment changes to ensure long-term benefits.
