A new species of the coral snake genus Sinomicrurus is described based on four specimens from southern Hainan Island （three specimens from Tianchi, Jianfengling National Nature Reserve, one specimen from Diaoluoshan ...A new species of the coral snake genus Sinomicrurus is described based on four specimens from southern Hainan Island （three specimens from Tianchi, Jianfengling National Nature Reserve, one specimen from Diaoluoshan National Nature Reserve）, Hainan Province, China. Morphologically, the new species is rather similar to Sinomicrurus kelloggi. However, it is distinct from S. kelloggi by the pattern on the head, the head length, head length/width, the number of infralabial scales, number of bands on dorsal body, and number of blotches on the belly.展开更多
In this paper we discuss the existence of at least three solutions for a class of gradient mixed boundary value systems. The approach is fully based on a recent three critical points theorem of B. Ricceri [A three cri...In this paper we discuss the existence of at least three solutions for a class of gradient mixed boundary value systems. The approach is fully based on a recent three critical points theorem of B. Ricceri [A three critical points theorem revisited, Nonlinear Anal., 70：9（2009）,3084-3089].展开更多
This paper explores the impacts of the universal two-child policy on Beijing’s population in the long term.It gives a detail estimation of Beijing population considering the latest fertility and immigration policy an...This paper explores the impacts of the universal two-child policy on Beijing’s population in the long term.It gives a detail estimation of Beijing population considering the latest fertility and immigration policy and can help related government department management population.The cohortcomponent method based on a net migration was applied to project population by age for Beijing from2020 to 2050 in four fertility scenarios.The innovation is the estimation method of the mortality rate with the life table linked with life expectancy.The results show that,though the basic development trend of Beijing’s population will not change essentially under the universal two-child policy,low birth rate and aging problems will be improved.Compared with the partial policy relaxation,the total population will be 876,478 persons more than that in 2050,the share of population aged 0–14 will increase 1.1 percentage points,and the aged dependency ratio will decrease 1.96 percentage points.Some measures should be taken to encourage more couples to have a second child and introduce more young talents to promote Beijing’s prosperity.展开更多
基金funded by the National Natural Science Foundation of China (31471968)Key Discipline of Ecology and Research Platform of Bioresource Institution, Huangshan University
文摘A new species of the coral snake genus Sinomicrurus is described based on four specimens from southern Hainan Island （three specimens from Tianchi, Jianfengling National Nature Reserve, one specimen from Diaoluoshan National Nature Reserve）, Hainan Province, China. Morphologically, the new species is rather similar to Sinomicrurus kelloggi. However, it is distinct from S. kelloggi by the pattern on the head, the head length, head length/width, the number of infralabial scales, number of bands on dorsal body, and number of blotches on the belly.
文摘In this paper we discuss the existence of at least three solutions for a class of gradient mixed boundary value systems. The approach is fully based on a recent three critical points theorem of B. Ricceri [A three critical points theorem revisited, Nonlinear Anal., 70：9（2009）,3084-3089].
基金supported by the National Natural Science Foundation of China under Grant Nos.71874184,71642006Key Deployment Project of the Chinese Academy of Sciences named‘National Nutrition and Food Security(2017–2018)’
文摘This paper explores the impacts of the universal two-child policy on Beijing’s population in the long term.It gives a detail estimation of Beijing population considering the latest fertility and immigration policy and can help related government department management population.The cohortcomponent method based on a net migration was applied to project population by age for Beijing from2020 to 2050 in four fertility scenarios.The innovation is the estimation method of the mortality rate with the life table linked with life expectancy.The results show that,though the basic development trend of Beijing’s population will not change essentially under the universal two-child policy,low birth rate and aging problems will be improved.Compared with the partial policy relaxation,the total population will be 876,478 persons more than that in 2050,the share of population aged 0–14 will increase 1.1 percentage points,and the aged dependency ratio will decrease 1.96 percentage points.Some measures should be taken to encourage more couples to have a second child and introduce more young talents to promote Beijing’s prosperity.
