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RISS 인기검색어
- 검색키워드
- 저자 : Xiangming Xiao (검색결과 2 건)
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Experimental study on white layers in high-speed grinding of AISI52100 hardened steel
Xiangming Huang,Yinghui Ren,Zhixiong Zhou,Hang Xiao 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.3
Ground white layer structure is an untempered martensitic due to grinding heat and plastic deformation. Many researchers have studiedthe formation of white layers at low grinding speed. However, few studies were found on white layer at high grinding speed. Therefore,to minimize white layer, it would be very useful to know the formation of white layer in the high-speed grinding. We performed grindingexperiments using hardened AISI52100 steel with cubic boron nitride (CBN). Grinding force and grinding temperature were onlinemeasured during grinding process. Surface roughness, residual stress and white layer were also examined, respectively. The influence ofgrinding wheel speed on grinding force and surface integrity was analyzed. Formation of white layer was also studied. Experimentalresults show that grinding force and plastic deformation decrease significantly at higher grinding speed. Meanwhile, white layer depthand residual stress value increase with the grinding wheel speed, and residual stress is well correlated with ground white layer depth. White layer during high-speed grinding process results from phase transformation due to grinding heat and rapid cooling, while the plasticdeformation may be ignored for the ground white layer.
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Chewing Lice of Swan Geese (Anser cygnoides)
Chang-Yong Choi,John Y. Takekawa,Diann J. Prosser,Lacy M. Smith,Craig R. Ely,Anthony D. Fox,Lei Cao,Xin Wang,Nyambayar Batbayar,Tseveenmayadag Natsagdorj,Xiangming Xiao 대한기생충학열대의학회 2016 The Korean Journal of Parasitology Vol.54 No.5
Chewing lice (Phthiraptera) that parasitize the globally threatened swan goose Anser cygnoides have been long recognized since the early 19th century, but those records were probably biased towards sampling of captive or domestic geese due to the small population size and limited distribution of its wild hosts. To better understand the lice species parasitizing swan geese that are endemic to East Asia, we collected chewing lice from 14 wild geese caught at 3 lakes in northeastern Mongolia. The lice were morphologically identified as 16 Trinoton anserinum (Fabricius, 1805), 11 Ornithobius domesticus Arnold, 2005, and 1 Anaticola anseris (Linnaeus, 1758). These species are known from other geese and swans, but all of them were new to the swan goose. This result also indicates no overlap in lice species between older records and our findings from wild birds. Thus, ectoparasites collected from domestic or captive animals may provide biased information on the occurrence, prevalence, host selection, and host-ectoparasite interactions from those on wild hosts.
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