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Zhentao Shang,Cheng Xu,Guizhi Xie,Jun Yi,Han Huang 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.7
Tungsten carbide cobalt coatings are widely employed for fabricating the parts used in corrosive and abrasive environments. The coatings are often deposited on substrates via high velocity oxygen fuel spraying, which are relatively hard and brittle and difficult to machine. This work systematically investigated the effect of high speed grinding conditions on the removal characteristics and machinability of WC-10Co-4Cr coatings. The wheel speed was found to have significant effect on grinding force and temperature. The subsurface damage could be considerably reduced when the grinding conditions were judiciously selected. The high speed grinding process being developed produced a satisfactory subsurface damage layer of smaller than 15 mm without spalling and large cracking that were usually observed in conventional grinding, suggesting its suitability for post-processing of the coating/substrate system.
Identification and Function Prediction of Novel MicroRNAs in Laoshan Dairy Goats
Ji, Zhibin,Wang, Guizhi,Zhang, Chunlan,Xie, Zhijing,Liu, Zhaohua,Wang, Jianmin Asian Australasian Association of Animal Productio 2013 Animal Bioscience Vol.26 No.3
MicroRNAs are a class of endogenous small RNAs that play important roles in post-transcriptional gene regulation by directing degradation of mRNAs or facilitating repression of target gene translation. In this study, three small RNA cDNA libraries from the mammary gland tissues of Laoshan dairy goats (Capra hircus) were constructed and sequenced, individually. Through Solexa high-throughput sequencing and bioinformatics analysis, we obtained 50 presumptive novel miRNAs candidates, and 55,448 putative target genes were predicted. GO annotations and KEGG pathway analyses showed the majority of target genes were involved in various biological processes and metabolic pathways. Our results discovered more information about the regulation network between miRNAs and mRNAs and paved a foundation for the molecular genetics of mammary gland development in goats.
Keli Peng,Pan Lu,Feihong Lin,Tan Jin,Wencheng Bao,Guizhi Xie,Zhentao Shang 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.6
The level and variation of energy partition ratio to grinding chips in high speed grinding of a nickel based alloy has been investigated. The ratio to grinding chips is evaluated by relating the heat partitioning at the chip formation area with the whole thermal system, which is used to evaluate the convection heat transfer coefficient (CHTC) of water based grinding fluid. High level of CHTCs of the grinding fluid have been identified at high grinding speeds, beneficial heat transfer conditions of low ratios to the workpiece can be achieved. As the burnout happens with the CHTC dropping down to zero level, the ratio to the workpiece and grinding chips would become much higher, around 30-40 % of the grinding heat can be taken away by grinding chips. For nickel based superalloys, it is possible to achieve high material removal rates with the effective cooling of the grinding zone.