Microscopic phase-field method was used to simulate the site occupation of a series of alloys with a stoichiometric composition of Ni75Al25?xFex (x=0, 5?10) aged at 1273 K. With the change of Fe content, quantitative ...Microscopic phase-field method was used to simulate the site occupation of a series of alloys with a stoichiometric composition of Ni75Al25?xFex (x=0, 5?10) aged at 1273 K. With the change of Fe content, quantitative calculations were made on each atomic site occupation probability (SOP) in L12-Ni3 (Al1?xFex), so as to find out the dynamic response law. The result of the study shows that, with the increase of Fe content, the Fe atom preferentially occupies the B sites (corner sites of FCC) with its SOP value being increased gradually, and the SOP of the Al atom on the B sites is greatly decreased. Meanwhile, AlNi and FeNi anti-sites form in the precipitation of L12 phase. Moreover, with the increase of Fe content, the formation of AlNi and FeNi anti-sites becomes much easier. In addition, it has been found that the instantaneous dynamic evolution of the atomic SOP is completed at the early stage of the growth of L12 phases.展开更多
During surveys for wild felids in Nangunhe Nature Reserve, Yunnan province, China, we conducted a wider mammal survey of the core nature reserve area, using camera trapping techniques. Forty motion-triggered digital c...During surveys for wild felids in Nangunhe Nature Reserve, Yunnan province, China, we conducted a wider mammal survey of the core nature reserve area, using camera trapping techniques. Forty motion-triggered digital camera traps had been set in oldest forest tract of protected area to conduct a species inventory. The total camera trapping effort of 2460 camera trap nights yielded 232 digital photographs of mammals represented by 17 species in ifve orders. The species photographed include rare and elusive species and those that are of high conservation value, such as IUCN endangered species Asiatic elephant （Elephas maximus）, and Phayre’s leaf monkey （Trachypit hecus phayrei）. In addition, IUCN vulnerable species including Asiatic black bear （Ursus thibetanus）, sambar （Rusa unicolor）, northern pig-tailed macaque （Macaca leonine）, and marbled cat （Pardofelis marmorata）, and more common species were found. Al mammals were also listed as key protected wild animals by the State Forestry Administration of China. Of particular importance were the carnivores, with 7 different species recorded. Ungulates and other taxa forming a prey base for these predators,such as rhesus macaque （Macaca mulatta）, red muntjac （Muntiacus muntjac）, sambar, wild boar （Sus scrofa）, and Chinese serow （Capricornis milneedwardsi）, were found to be the most frequently photographed and most widespread species. Opportunities for local people to develop standardized monitoring designs for targeted species were identiifed by these initial assessment results. Local nature reserve staff lacked technical ability to produce standardized survey designs, yet a by product of this type of non-standardized data collection can be very informative and produce inventory information that gives a species richness analysis, as well as initial estimates for occupancy and detection probability for abundant species to drive future standardized survey designs and efforts.展开更多
Camera traps serve as an important tool for monitoring species diversity. We used data from camera traps set for capturing snow leopards（Panthera uncia） in the Yanchiwan National Nature Reserve,Gansu Province,China,...Camera traps serve as an important tool for monitoring species diversity. We used data from camera traps set for capturing snow leopards（Panthera uncia） in the Yanchiwan National Nature Reserve,Gansu Province,China,to assess species richness with respect to mammal and birds species. We also assessed survey efficiency for species detection,and conducted an initial analysis of species interactions. The survey effort of 10,171 camera workdays yielded 2,868 suitable animal image events involving 17 mammal and 20 bird species. Among these,the dhole（Cuon alpinus） is considered to be Endangered,the snow leopard and white-lipped deer（Cervus albirostris） Vulnerable,and the Pallas＇ s cat（Feli smanul）,mountain weasel（Mustela altaica）,Himalayan griffon（Gyps himalayensis） and cinereous vulture（Aegypius monachus） Near Threatened under the IUCN red list. Fourteen species were also listed as key protected wild animals according to China national standards. Both the rarefaction curves and richness estimators suggested our sampling for mammal and pheasant species is sufficient,while more survey efforts are still needed to detect other bird species. With a focus on the dominant species Eurasian lynx（Lynx lynx）,occupancy models were used to estimate site use and detection probability for selected species,and to investigate predator-prey relationships between lynx on the one hand and woolly hare（Lepus oiostolus）,pika（Ochotona spp.）and Tibetan partridge（Perdix hodgsoniae） on the other. We give recommendations on how to increase efficiency in camera-based species inventory and biodiversity monitoring.展开更多
基金Project(2013011014-1)supported by the Natural Science Funds of Shanxi Province,ChinaProject(2009021028)supported by Science and Technique Foundation for Young Scholars of Shanxi Province,China
文摘Microscopic phase-field method was used to simulate the site occupation of a series of alloys with a stoichiometric composition of Ni75Al25?xFex (x=0, 5?10) aged at 1273 K. With the change of Fe content, quantitative calculations were made on each atomic site occupation probability (SOP) in L12-Ni3 (Al1?xFex), so as to find out the dynamic response law. The result of the study shows that, with the increase of Fe content, the Fe atom preferentially occupies the B sites (corner sites of FCC) with its SOP value being increased gradually, and the SOP of the Al atom on the B sites is greatly decreased. Meanwhile, AlNi and FeNi anti-sites form in the precipitation of L12 phase. Moreover, with the increase of Fe content, the formation of AlNi and FeNi anti-sites becomes much easier. In addition, it has been found that the instantaneous dynamic evolution of the atomic SOP is completed at the early stage of the growth of L12 phases.
基金Second National Survey of Terrestrial Wildlife in China,State Forestry Administration of China
文摘During surveys for wild felids in Nangunhe Nature Reserve, Yunnan province, China, we conducted a wider mammal survey of the core nature reserve area, using camera trapping techniques. Forty motion-triggered digital camera traps had been set in oldest forest tract of protected area to conduct a species inventory. The total camera trapping effort of 2460 camera trap nights yielded 232 digital photographs of mammals represented by 17 species in ifve orders. The species photographed include rare and elusive species and those that are of high conservation value, such as IUCN endangered species Asiatic elephant （Elephas maximus）, and Phayre’s leaf monkey （Trachypit hecus phayrei）. In addition, IUCN vulnerable species including Asiatic black bear （Ursus thibetanus）, sambar （Rusa unicolor）, northern pig-tailed macaque （Macaca leonine）, and marbled cat （Pardofelis marmorata）, and more common species were found. Al mammals were also listed as key protected wild animals by the State Forestry Administration of China. Of particular importance were the carnivores, with 7 different species recorded. Ungulates and other taxa forming a prey base for these predators,such as rhesus macaque （Macaca mulatta）, red muntjac （Muntiacus muntjac）, sambar, wild boar （Sus scrofa）, and Chinese serow （Capricornis milneedwardsi）, were found to be the most frequently photographed and most widespread species. Opportunities for local people to develop standardized monitoring designs for targeted species were identiifed by these initial assessment results. Local nature reserve staff lacked technical ability to produce standardized survey designs, yet a by product of this type of non-standardized data collection can be very informative and produce inventory information that gives a species richness analysis, as well as initial estimates for occupancy and detection probability for abundant species to drive future standardized survey designs and efforts.
基金National Natural Science Foundation of China(31470567)
文摘Camera traps serve as an important tool for monitoring species diversity. We used data from camera traps set for capturing snow leopards（Panthera uncia） in the Yanchiwan National Nature Reserve,Gansu Province,China,to assess species richness with respect to mammal and birds species. We also assessed survey efficiency for species detection,and conducted an initial analysis of species interactions. The survey effort of 10,171 camera workdays yielded 2,868 suitable animal image events involving 17 mammal and 20 bird species. Among these,the dhole（Cuon alpinus） is considered to be Endangered,the snow leopard and white-lipped deer（Cervus albirostris） Vulnerable,and the Pallas＇ s cat（Feli smanul）,mountain weasel（Mustela altaica）,Himalayan griffon（Gyps himalayensis） and cinereous vulture（Aegypius monachus） Near Threatened under the IUCN red list. Fourteen species were also listed as key protected wild animals according to China national standards. Both the rarefaction curves and richness estimators suggested our sampling for mammal and pheasant species is sufficient,while more survey efforts are still needed to detect other bird species. With a focus on the dominant species Eurasian lynx（Lynx lynx）,occupancy models were used to estimate site use and detection probability for selected species,and to investigate predator-prey relationships between lynx on the one hand and woolly hare（Lepus oiostolus）,pika（Ochotona spp.）and Tibetan partridge（Perdix hodgsoniae） on the other. We give recommendations on how to increase efficiency in camera-based species inventory and biodiversity monitoring.
