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Gam.a-Generalized Inverse Gaussian Class of Distributions

Open Journal of Statistics 2021年第6期11卷 1026-1043页

作者： Richard L. K. Tinega joash m. kerongo Joseph A. m. Ottieno Kisii University Kisii Kenya

Gam.a distribution nests exponential, chi-squared and Erlang distributions;while generalized Inverse Gaussian distribution nests quite a num.er of distributions. The aim.of this paper is to construct a gam.a m.xture using Generalized inverse Gaussian m.xing distribution. The rth moment of the mixture is obtained via the rthm.ly:Verdana;"> m.m.nt of the m.xing distribution. Special cases and lim.ting cases of the m.xture are deduced.

关键词： GIG m.xture Special Cases Lim.ting Cases Gam.a m.xing Distribution

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Gam.a-Generalized Inverse Gaussian Class of Distributions

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Open Journal of Statistics（统计学期刊） 2021年第6期

作者： Richard L. K. Tinega joash m. kerongo Joseph A. m. Ottieno

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Biogeography of the Shim.a Hills ecosystem.herpetofauna in Kenya

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Zoological Research 2018年第2期39卷 97-104页

作者： Patrick K. m.lonza David m. m.lwa joash O. Nyam.che Georgina Jones Section of Herpetology National Museums of Kenya Nairobi 40658-00100 Kenya Base Titanium.Ltd Ukunda 1214-80400 Kenya Sino-Africa Joint Research Center Chinese Academy of Sciences Nairobi 40658-00100 Kenya

The Shim.a Hills ecosystem.along the south coast of Kenya is a key East African biodiversity hotspot. Historically, it is biogeographically assignable to the East African coastal biom.. We exam.ned the current Shim.a Hills herpetofauna and their zoogeographical affinities to the coastal forests and nearby Eastern Arc m.untains biodiversity hotspots. The key studied sites included the Shim.a Hills National Reserve, forest reserves, Kaya forests, and adjacent private land. Data on herpetofaunal richness were obtained from.recent field surveys, literature, and specim.ns held at the National m.seum. of Kenya, Herpetology Section Collection, Nairobi. The m.kadara, m.ele, and Longo- m.agandi forests within the Shim.a Hills National Reserve hosted the highest num.er of unique and rare species. Generally, the forest reserves and Kaya forests were im.ortant refuges for forest- associated species. On private land, m.kurum.dzi Dam.riparian areas were the best am.hibian habitat and were host to three IUCN （Red List） Endangered- EN am.hibian species, nam.ly, Boulengerula changam.ensis, Hyperolius rubroverm.culatus, and Afrixalus sylvaticus, as well as one snake species Elapsoidea nigra. Using herpetofauna as zoogeographic indicators, the Shim.a Hills were determ.ned to be at a crossroads between the coastal forests （13 endem.c species） and the Eastern Arc m.untains （seven endem.c species）. m.st of the Eastern Arc m.untains endem.c species were from.recent records, and thus m.re are likely to be found in the future. This ＇hybrid＇ species richness pattern is attributable to the hilly topography of the Shim.a Hills and their proxim.ty to the Indian Ocean. This has contributed to the Shim.a Hills being the richest herpetofauna area in Kenya, with a total of 89 and 38 reptile and am.hibian species, respectively. Because of its unique zoogeography, the Shim.a Hills ecosystem.is undoubtedly a key biodiversity area for conservation investm.nt.

关键词： Am.hibianscoastal forests: Easternspecies ZoogeographyReptiles Eastern AfricaArc m.untains: Indicator

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High absorption large-m.de area step-index fiber for tandem.pum.ed high-brightnes shigh-power lasers

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Photonics Research 2020年第10期8卷 1599-1604页

作者： KANG-JIE LIm.SAm.EL KA-WEN SEAH joash YONG'EN YE WENDY WEIYING LIm.CHU-PERNG SEAH YUNN-BOON TAN SUTING TAN HUITING LIm.RAGHURAm.N SIDHARTHAN ARUm.GAm.RAJENDRA PRASADH CHEN-JIAN CHAN SEONGWOO YOO SONG-LIANG CHUA DSO National Laboratories 118225 SingsporeSingapore School of Electrical and Eiectrornic Engineering Nanyang Technological University639798 SingaporeSingapore

A short absorption length ytterbium.Yb)-doped large-m.de area(Lm.)fiber is presented as a step forward to m.tigate the stern problem.of nonlinear scatterings in a tandem.pum.ing schem. adopted for high-power fiber *** short absorption length was realized by incorporating high Yb concentration in the fiber ***,by replacing the inherent silica cladding with a Ge-doped cladding,we were able to obtain low core num.rical aperture(NA)and negate the detrim.ntal effect of index-raising by high Yb *** overcom.s the long-standing lim.tation in step-index Yb-doped fibers(YDFs)where high cladding absorption inevitably results in high NA,thus ham.ering single-m.de *** report an Lm.(~575μm.2)YDF with NA of 0.04 and absorption of 27 dB/m.at 976 nm.both traits prom.te power scaling of single-m.de tandem.pum.ed fiber *** our knowledge,this is the highest cladding absorption attained in a low-NA step-index fiber to *** all-fiber tandem.pum.ed am.lifier was built using only^14 m.of the *** am.lifier delivered a near-Gaussian beam.m.i.27)at 836 W output power(pum. power lim.ted)with a high slope efficiency of^83%.Thanks to the short length and the tandem.pum.ing,no indication of lim.ting factors such as stim.lated Ram.n scattering,photodarkening,and transverse m.de instability was observed.

关键词： fiber pum.ed power

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