To adapt to the change in the demand of the oil refining market,two hydrocracking catalysts,RHC-1 and RHC-5,were developed to improve the quality of tail oil.The catalysts were designed based on the theory of selectiv...To adapt to the change in the demand of the oil refining market,two hydrocracking catalysts,RHC-1 and RHC-5,were developed to improve the quality of tail oil.The catalysts were designed based on the theory of selective ring-opening.By selecting more acidic molecular sieves,the problem of poor selectivity of conventional materials can be solved to properly match up to the hydrogenation performance of catalysts.Compared with the performance of previous catalysts,the quality of the tail oil achieved by the said catalysts is better,and the BMCI is reduced by 1—2 units.In the long cycle operation of the petroleum industry,the good quality of the tail oil has been verified and the adaptability of the process conditions is good.When the RHC-1 catalyst is used to process heavy feed under medium pressure,a BMCI value of about12 can be obtained along with a nearly 60%yield of tail oil.The total yield of chemical raw material(steaming cracking feed+catalytic reforming feed)can exceed 80%,and the hydrogen consumption has dropped by nearly 50%as compared to the conventional hydrocracking conversion rate.When processing a mixed CGO and VGO feed with the full conversion mode under a hydrogen pressure of 13.0 MPa,the RHC-5 catalyst can yield about 68.4%of heavy naphtha with a potential aromatic content of up to 50.6,while the total yield of chemical raw materials can reach more than 98%.The results of industrial application of these catalysts show that more than 30%of high quality tail oil can be obtained via processing of inferior quality feed,and its BMCI value can reach 10.7.The total yield of chemical raw materials can reach more than65%.The industrial operation process has implemented two operating cycles totaling 8 years.展开更多
An accounting professional is called a ＂Certified Public Accountant Financial Advisor （CPAFA）＂ in Turkey and the profession has a notable status in the country. Individuals choosing this profession have to complet...An accounting professional is called a ＂Certified Public Accountant Financial Advisor （CPAFA）＂ in Turkey and the profession has a notable status in the country. Individuals choosing this profession have to complete a minimum 3-year internship program before becoming members of this profession. They have to pass an exam both to start and finish the internship program. The profession and the reasons for choosing it are highly significant issues. Therefore, the present study was conducted to investigate the factors directing the professional choices of prospective individuals who wish to be CPAFAs and the significance of such factors. Along with these objectives, a nation-wide study was conducted on candidates who took the CPAFA internship exam in periods of 2012-3, 2013-1, and 2013-2 （three periods）. The factors affecting candidates＇ choices to be an accountant professional were gathered under five groups. The factors ＂influence of immediate surroundings＂, ＂prestigious social status of the profession＂, ＂high life-long income potential＂, ＂flexible working hours＂, and ＂future guarantee of the profession＂ had higher factor loadings than other factors.展开更多
This article uses the age-structure/life-cycle method to analyze the impact of migrant workers’ employment on their urbanization. Since enterprises tend to employ younger workers and unemployed migrant workers tend t...This article uses the age-structure/life-cycle method to analyze the impact of migrant workers’ employment on their urbanization. Since enterprises tend to employ younger workers and unemployed migrant workers tend to be middle-aged, we first apply the age structure/life cycle model to carry out our estimations, pointing out that in order to complete the urbanization of their families, migrant worker couples usually have to work for thirty years consecutively after marriage. On this basis, the article constructs a working life table for migrant workers and uses it to estimate the total quantity of Chinese migrant workers who have the minimum economic capacity required for urbanization. Taking into consideration future changes in the age structure of enterprise employment, we estimate that over the sixty-nine million migrant workers who were under thirty years old in 2006, together with their families, would already be in possession of the minimum economic conditions for settling in urban areas.展开更多
基金the financial support from the SINOPEC(No.114016)
文摘To adapt to the change in the demand of the oil refining market,two hydrocracking catalysts,RHC-1 and RHC-5,were developed to improve the quality of tail oil.The catalysts were designed based on the theory of selective ring-opening.By selecting more acidic molecular sieves,the problem of poor selectivity of conventional materials can be solved to properly match up to the hydrogenation performance of catalysts.Compared with the performance of previous catalysts,the quality of the tail oil achieved by the said catalysts is better,and the BMCI is reduced by 1—2 units.In the long cycle operation of the petroleum industry,the good quality of the tail oil has been verified and the adaptability of the process conditions is good.When the RHC-1 catalyst is used to process heavy feed under medium pressure,a BMCI value of about12 can be obtained along with a nearly 60%yield of tail oil.The total yield of chemical raw material(steaming cracking feed+catalytic reforming feed)can exceed 80%,and the hydrogen consumption has dropped by nearly 50%as compared to the conventional hydrocracking conversion rate.When processing a mixed CGO and VGO feed with the full conversion mode under a hydrogen pressure of 13.0 MPa,the RHC-5 catalyst can yield about 68.4%of heavy naphtha with a potential aromatic content of up to 50.6,while the total yield of chemical raw materials can reach more than 98%.The results of industrial application of these catalysts show that more than 30%of high quality tail oil can be obtained via processing of inferior quality feed,and its BMCI value can reach 10.7.The total yield of chemical raw materials can reach more than65%.The industrial operation process has implemented two operating cycles totaling 8 years.
文摘An accounting professional is called a ＂Certified Public Accountant Financial Advisor （CPAFA）＂ in Turkey and the profession has a notable status in the country. Individuals choosing this profession have to complete a minimum 3-year internship program before becoming members of this profession. They have to pass an exam both to start and finish the internship program. The profession and the reasons for choosing it are highly significant issues. Therefore, the present study was conducted to investigate the factors directing the professional choices of prospective individuals who wish to be CPAFAs and the significance of such factors. Along with these objectives, a nation-wide study was conducted on candidates who took the CPAFA internship exam in periods of 2012-3, 2013-1, and 2013-2 （three periods）. The factors affecting candidates＇ choices to be an accountant professional were gathered under five groups. The factors ＂influence of immediate surroundings＂, ＂prestigious social status of the profession＂, ＂high life-long income potential＂, ＂flexible working hours＂, and ＂future guarantee of the profession＂ had higher factor loadings than other factors.
文摘This article uses the age-structure/life-cycle method to analyze the impact of migrant workers’ employment on their urbanization. Since enterprises tend to employ younger workers and unemployed migrant workers tend to be middle-aged, we first apply the age structure/life cycle model to carry out our estimations, pointing out that in order to complete the urbanization of their families, migrant worker couples usually have to work for thirty years consecutively after marriage. On this basis, the article constructs a working life table for migrant workers and uses it to estimate the total quantity of Chinese migrant workers who have the minimum economic capacity required for urbanization. Taking into consideration future changes in the age structure of enterprise employment, we estimate that over the sixty-nine million migrant workers who were under thirty years old in 2006, together with their families, would already be in possession of the minimum economic conditions for settling in urban areas.
