Based on the meteorological data of 24 automatic stations in Xinfeng County,combined with the climatic conditions for the growth of Morinda officinalis F.C.How and Sarcandra glabra(Thunb.)Nakai,the climate suitability...Based on the meteorological data of 24 automatic stations in Xinfeng County,combined with the climatic conditions for the growth of Morinda officinalis F.C.How and Sarcandra glabra(Thunb.)Nakai,the climate suitability zoning indicators of M.officinalis and S.glabra in Xinfeng County were constructed by relevant statistical methods,and the climate suitability zoning indicators were divided into four grades:most suitable,suitable,sub-suitable and unsuitable.According to the results of expert scores,the relevant growth impact factors were assigned weight values.Based on geographic information system(GIS),the climate suitability zoning of M.officinalis and S.glabra planting in Xinfeng County was carried out.The results show that most areas of Xinfeng County were suitable for planting M.officinalis and S.glabra.Among them,the most suitable planting areas of M.officinalis were mainly distributed in most of Huilong Town,from Jiangnan Community of Fengcheng Street to Yuntianhai area of Meikeng Town,Matouwantian Village and areas to the south,and areas to the south of Zhutong Village,Fengcheng Street.The most suitable areas for S.glabra planting were mainly distributed in Puchang Village of Huilong Town,the northeast of Huangzhai Town,the south of Fengcheng Street,and the central-southern part of Matou Town.The zoning results provide a scientific basis for the rational layout of M.officinalis and S.glabra planting in Xinfeng County.展开更多
为探究濒危植物海南紫荆木(Madhuca hainanensis Chun et F.C.How)的种群结构与动态特征,以海南岛尖峰岭林区内天然分布的海南紫荆木种群为研究对象,在充分野外调查的基础上,基于胸径(DBH)分析了种群的年龄结构,并分析了种群的动态指数...为探究濒危植物海南紫荆木(Madhuca hainanensis Chun et F.C.How)的种群结构与动态特征,以海南岛尖峰岭林区内天然分布的海南紫荆木种群为研究对象,在充分野外调查的基础上,基于胸径(DBH)分析了种群的年龄结构,并分析了种群的动态指数、静态生命表、存活曲线、死亡率曲线、消失率曲线、生存力和空间分布格局。结果表明:Ⅱ级(2.5 cm≤DBH<7.5 cm)和Ⅲ级(7.5 cm≤DBH<12.5 cm)个体数明显多于其他径级,Ⅴ级(17.5 cm≤DBH<22.5 cm)和Ⅵ级(22.5 cm≤DBH<27.5 cm)个体数较多。从种群动态指数看,该海南紫荆木种群呈现“衰退—增长—衰退”的动态变化趋势;忽略外界干扰时的种群动态指数(V_(pi))和考虑外界干扰时的种群动态指数(V_(pi)′)分别为17.86%和0.44%,种群对外界随机干扰所承担的最大风险概率(P_(max))为2.78%,说明该种群呈增长趋势,且对外界随机干扰的敏感性强。该种群的生命期望随着径级增大而降低,且存活曲线趋近于Deevey-Ⅱ型。种群的死亡率和消失率整体上随径级增大而升高,而存活个体数量则随着径级增大而减少。生存力分析结果显示:该种群在幼龄期易受到外界的影响,并在生长中后期面临较高的死亡风险,种群生存力较低。另外,从空间分布格局看,该种群呈聚集分布。综上所述,海南岛尖峰岭林区的海南紫荆木种群缺少幼苗个体,种群稳定性较差,易受外界干扰,建议通过原地保护、扩繁及人工补植幼苗等方式实现种群更新和恢复。展开更多
In this short review,we highlight instances where interstitials have been shown to substantially increase the yield strength and work-hardening rate(WHR)of f.c.c.alloys,particularly high entropy alloys,medium entropy ...In this short review,we highlight instances where interstitials have been shown to substantially increase the yield strength and work-hardening rate(WHR)of f.c.c.alloys,particularly high entropy alloys,medium entropy alloys,TWIP steels and stainless steels.However,the common practice of describing interstitial strengthening in f.c.c.alloys using models that are used to explain substitutional strengthening appears to be neither appropriate nor accurate.Here we suggest,based on the literature,that the yield strength increase due to interstitials in f.c.c.alloys is more appropriately described by a linear dependence on the concentration:due to a paucity of experimental studies,the dependence of the yield strength and WHR on misfit parameters is currently unclear.Thus,the source of the strengthening remains unclear.A feature that has been observed in several f.c.c.alloys is that interstitial additions lead to a change from wavy to planar slip although the origin of this change,which may be related to changes in stacking fault energy as well as other factors,remains unclear.The paper concludes by outlining areas of future research,including the need to develop a new model for interstitial strengthening in f.c.c.alloys.展开更多
Let R ＊θ G be the skew group ring with a F.C group G and the group homomrphism 8 from G to Aut（R）, the group of automorphisms of the ring R. In this paper,the necessary and sufficient condition such that R ＊θ G ...Let R ＊θ G be the skew group ring with a F.C group G and the group homomrphism 8 from G to Aut（R）, the group of automorphisms of the ring R. In this paper,the necessary and sufficient condition such that R ＊θ G will be Noetherian is given, which generalizes the results of LG. connel.展开更多
In this paper we establish sharp H/51der estimates of harmonic functions on a class of connected post critically finite （p.c.f.） self-similar sets, and show that functions in the domain of Laplacian enjoy the same p...In this paper we establish sharp H/51der estimates of harmonic functions on a class of connected post critically finite （p.c.f.） self-similar sets, and show that functions in the domain of Laplacian enjoy the same property. Some weU-known examples, such as the Sierpinski gasket, the unit interval, the level 3 Sierpinski gasket, the hexagasket, the 3-dimensional Sierpinski gasket, and the Vicsek set are also considered.展开更多
In this paper we establish the oscillation inequality of harmonic functions and HOlder estimate of the functions in the domain of the Laplacian on connected post critically finite （p.c.f.） self-similar sets.
文摘Based on the meteorological data of 24 automatic stations in Xinfeng County,combined with the climatic conditions for the growth of Morinda officinalis F.C.How and Sarcandra glabra(Thunb.)Nakai,the climate suitability zoning indicators of M.officinalis and S.glabra in Xinfeng County were constructed by relevant statistical methods,and the climate suitability zoning indicators were divided into four grades:most suitable,suitable,sub-suitable and unsuitable.According to the results of expert scores,the relevant growth impact factors were assigned weight values.Based on geographic information system(GIS),the climate suitability zoning of M.officinalis and S.glabra planting in Xinfeng County was carried out.The results show that most areas of Xinfeng County were suitable for planting M.officinalis and S.glabra.Among them,the most suitable planting areas of M.officinalis were mainly distributed in most of Huilong Town,from Jiangnan Community of Fengcheng Street to Yuntianhai area of Meikeng Town,Matouwantian Village and areas to the south,and areas to the south of Zhutong Village,Fengcheng Street.The most suitable areas for S.glabra planting were mainly distributed in Puchang Village of Huilong Town,the northeast of Huangzhai Town,the south of Fengcheng Street,and the central-southern part of Matou Town.The zoning results provide a scientific basis for the rational layout of M.officinalis and S.glabra planting in Xinfeng County.
基金supported by the U.S.Department of Energy,Office of Science,Basic Energy Sciences,under Award#DE-SC0018962.
文摘In this short review,we highlight instances where interstitials have been shown to substantially increase the yield strength and work-hardening rate(WHR)of f.c.c.alloys,particularly high entropy alloys,medium entropy alloys,TWIP steels and stainless steels.However,the common practice of describing interstitial strengthening in f.c.c.alloys using models that are used to explain substitutional strengthening appears to be neither appropriate nor accurate.Here we suggest,based on the literature,that the yield strength increase due to interstitials in f.c.c.alloys is more appropriately described by a linear dependence on the concentration:due to a paucity of experimental studies,the dependence of the yield strength and WHR on misfit parameters is currently unclear.Thus,the source of the strengthening remains unclear.A feature that has been observed in several f.c.c.alloys is that interstitial additions lead to a change from wavy to planar slip although the origin of this change,which may be related to changes in stacking fault energy as well as other factors,remains unclear.The paper concludes by outlining areas of future research,including the need to develop a new model for interstitial strengthening in f.c.c.alloys.
基金Supported by the NSF of Educational Department of Henan Province(20025100003)
文摘Let R ＊θ G be the skew group ring with a F.C group G and the group homomrphism 8 from G to Aut（R）, the group of automorphisms of the ring R. In this paper,the necessary and sufficient condition such that R ＊θ G will be Noetherian is given, which generalizes the results of LG. connel.
基金supported by the grants NSFC11201232, 12KJB110008Qing Lan Project, 13KJB110015, 12YJAZH096the Project-sponsored by SRF for ROCS, SEM
文摘In this paper we establish sharp H/51der estimates of harmonic functions on a class of connected post critically finite （p.c.f.） self-similar sets, and show that functions in the domain of Laplacian enjoy the same property. Some weU-known examples, such as the Sierpinski gasket, the unit interval, the level 3 Sierpinski gasket, the hexagasket, the 3-dimensional Sierpinski gasket, and the Vicsek set are also considered.
基金supported by the National Natural Science Foundation of China(No.11201232)Qing Lan Project of Jiangsu Province
文摘In this paper we establish the oscillation inequality of harmonic functions and HOlder estimate of the functions in the domain of the Laplacian on connected post critically finite （p.c.f.） self-similar sets.
