文章基于5C理论,提出了浮动利率住房抵押贷款提前偿付率1(prepayment rat e of house mortgage wi t h f l oat i ng i nt er est r at e)影响因素的理论框架。基于该理论框架,文章选择相应的指标测度了提前偿付率与其影响因素。在比较...文章基于5C理论,提出了浮动利率住房抵押贷款提前偿付率1(prepayment rat e of house mortgage wi t h f l oat i ng i nt er est r at e)影响因素的理论框架。基于该理论框架,文章选择相应的指标测度了提前偿付率与其影响因素。在比较已有实证方法优劣的基础上,文章选择了偏最小二乘方法来检验各个因素对提前偿付率的影响方向和影响程度,并运用多元回归分析进行了稳健性检验。展开更多
This study was performed in two phases of work.In the first stage,four conventional first-order flotation kinetics models were fitted to the measured recoveries data and the best model were selected.In the second stag...This study was performed in two phases of work.In the first stage,four conventional first-order flotation kinetics models were fitted to the measured recoveries data and the best model were selected.In the second stage,influence of pH,solid concentration,water chemistry and the amount of collector dosage were investigated on kinetics parameters including flotation rate constant and ultimate recovery.The results indicated that that perfectly mixed reactor model and Kelsall model gave the best and the weakest fit to the experimental data,respectively.It was observed that flotation rate constant and ultimate recovery were strongly affected by chemical factors investigated especially water quality.The flotation rate constant decreased with increasing the solids content,while ultimate recovery increased to certain value and thereafter reduced.It was also found that the most values of flotation rate constant and ultimate recovery obtained in dosage of collector are 30 and 40 g/t,respectively.展开更多
Polyester mooring has become increasing popular to serve as permanent station-keeping system for deepwater floating system during recent years. Comparing to the traditional steel wire mooring,polyester mooring provide...Polyester mooring has become increasing popular to serve as permanent station-keeping system for deepwater floating system during recent years. Comparing to the traditional steel wire mooring,polyester mooring provides significant benefits in deepwater,such as reduced installed capital expenditure (CAPEX) and smaller vertical loads on host platform. Polyester rope is a visco-elastic material,and its stiffness is nonlinear and affected by mean load,load range,loading period and loading history. There is a perception that the polyester stiffness model has significant impact on the floating system's performance. This paper presents a detailed description and comparison of two stiffness models and three analytic approaches,and provides a systematic study of the impact of polyester mooring stiffness modeling on the deepwater floating system performance.展开更多
The paper analyzes the financing activity, investing activity and operating activity of Target Corporation by comparing with other companies in the same industry. The analysis shows that Target overall is better at me...The paper analyzes the financing activity, investing activity and operating activity of Target Corporation by comparing with other companies in the same industry. The analysis shows that Target overall is better at meeting it in short-term obligations as well as earning money for its investors. Target is a safe and consistent investment. The company should pay attention to interest rate changes because the company＇s majority of financing charges are based on floating-rate debt obligations.展开更多
The effects of acid surface dissolution on the flotation kinetics of ilmenite(IL)and its common accompanied gangue minerals including olivine-pyroxene(Ol-Px),tremolite-clinochlore(Tr-Cch)and quartz were investigated.T...The effects of acid surface dissolution on the flotation kinetics of ilmenite(IL)and its common accompanied gangue minerals including olivine-pyroxene(Ol-Px),tremolite-clinochlore(Tr-Cch)and quartz were investigated.The results show that through the surface dissolution the adsorption rate constant for ilmenite increases from 5.272 to 8.441 mol/(g·min)while it decreases for Ol-Px,Tr-Cch and quartz from 6.332,7.309 and 7.774 mol/(g·min)to 5.034,6.223 and 7.371 mol/(g·min),respectively.Also,the flotation experiments on a binary mixture of minerals indicate that after surface dissolution the values of modified rate constant for ilmenite flotation from Ol-Px,Tr-Cch and quartz are enhanced from 36.15,36.52 and 47.86 min-1 to 41.72,45.78 and 56.24 min-1,respectively.This results in the improvement of kinetic selectivity index(SI)in the separation of treated ilmenite from gangue minerals.As evidenced by ICP-MS analysis,the decrease of kinetic parameters for gangue minerals can be due to the removal of Fe^2+,Ca^2+and Mg^2+ions from their surfaces,which results in the lack of enough active sites to interact with collector species.As confirmed by contact angle measurements,this prevents the formation of a stable hydrophobic layer on the minerals surfaces for creating stable attachments between minerals and bubbles.Generally,the improvement of ilmenite flotation kinetics has a negative correlation with the iron content in its accompanied gangue minerals.展开更多
文摘文章基于5C理论,提出了浮动利率住房抵押贷款提前偿付率1(prepayment rat e of house mortgage wi t h f l oat i ng i nt er est r at e)影响因素的理论框架。基于该理论框架,文章选择相应的指标测度了提前偿付率与其影响因素。在比较已有实证方法优劣的基础上,文章选择了偏最小二乘方法来检验各个因素对提前偿付率的影响方向和影响程度,并运用多元回归分析进行了稳健性检验。
文摘This study was performed in two phases of work.In the first stage,four conventional first-order flotation kinetics models were fitted to the measured recoveries data and the best model were selected.In the second stage,influence of pH,solid concentration,water chemistry and the amount of collector dosage were investigated on kinetics parameters including flotation rate constant and ultimate recovery.The results indicated that that perfectly mixed reactor model and Kelsall model gave the best and the weakest fit to the experimental data,respectively.It was observed that flotation rate constant and ultimate recovery were strongly affected by chemical factors investigated especially water quality.The flotation rate constant decreased with increasing the solids content,while ultimate recovery increased to certain value and thereafter reduced.It was also found that the most values of flotation rate constant and ultimate recovery obtained in dosage of collector are 30 and 40 g/t,respectively.
文摘Polyester mooring has become increasing popular to serve as permanent station-keeping system for deepwater floating system during recent years. Comparing to the traditional steel wire mooring,polyester mooring provides significant benefits in deepwater,such as reduced installed capital expenditure (CAPEX) and smaller vertical loads on host platform. Polyester rope is a visco-elastic material,and its stiffness is nonlinear and affected by mean load,load range,loading period and loading history. There is a perception that the polyester stiffness model has significant impact on the floating system's performance. This paper presents a detailed description and comparison of two stiffness models and three analytic approaches,and provides a systematic study of the impact of polyester mooring stiffness modeling on the deepwater floating system performance.
文摘The paper analyzes the financing activity, investing activity and operating activity of Target Corporation by comparing with other companies in the same industry. The analysis shows that Target overall is better at meeting it in short-term obligations as well as earning money for its investors. Target is a safe and consistent investment. The company should pay attention to interest rate changes because the company＇s majority of financing charges are based on floating-rate debt obligations.
文摘The effects of acid surface dissolution on the flotation kinetics of ilmenite(IL)and its common accompanied gangue minerals including olivine-pyroxene(Ol-Px),tremolite-clinochlore(Tr-Cch)and quartz were investigated.The results show that through the surface dissolution the adsorption rate constant for ilmenite increases from 5.272 to 8.441 mol/(g·min)while it decreases for Ol-Px,Tr-Cch and quartz from 6.332,7.309 and 7.774 mol/(g·min)to 5.034,6.223 and 7.371 mol/(g·min),respectively.Also,the flotation experiments on a binary mixture of minerals indicate that after surface dissolution the values of modified rate constant for ilmenite flotation from Ol-Px,Tr-Cch and quartz are enhanced from 36.15,36.52 and 47.86 min-1 to 41.72,45.78 and 56.24 min-1,respectively.This results in the improvement of kinetic selectivity index(SI)in the separation of treated ilmenite from gangue minerals.As evidenced by ICP-MS analysis,the decrease of kinetic parameters for gangue minerals can be due to the removal of Fe^2+,Ca^2+and Mg^2+ions from their surfaces,which results in the lack of enough active sites to interact with collector species.As confirmed by contact angle measurements,this prevents the formation of a stable hydrophobic layer on the minerals surfaces for creating stable attachments between minerals and bubbles.Generally,the improvement of ilmenite flotation kinetics has a negative correlation with the iron content in its accompanied gangue minerals.
