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Zhongzheng Pei,Renbo Song,Yifan Feng,Jie Xu 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.11
Here we utilized two cooling methods, forced air cooling and furnace cooling, to obtain two different triplex microstructureswhich were martensite-based and bainite-based, respectively. Compared with furnace cooled samples, the forced air cooledsamples presented about 5% higher ultimate tensile strength, 10% higher hardness and 43% lower Charpy impact energyvalue. Nano-indentation test was conducted to reveal the local mechanical properties. The nano-hardness of martensite,bainite and the mixture microstructure is 5.633 GPa, 4.200 GPa and 5.082 GPa, respectively. Mn, S, C and Si segregationat the grain boundaries in martensite are severely detrimental to the toughness. High rotation angle grain boundaries andprecipitates of rare earth element enhanced the toughness of bainite. Martensite with high density dislocations in fine lathsexhibited higher nano-hardness than bainite with lower density dislocations in wider sized laths. The interaction of the twophases with martensite twinning sub structure between bainite laths showed intermediate nano-hardness.
Jiawei Liu,Lin Li,Zhongzheng Xu,Yongpeng Sun,Yining Wu,Caili Dai 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.106 No.-
Fracture conformance control in reservoir can effectively improve water channel to increase crude oil displacementefficiency of subsequent waterflooding. Inspired by the remarkable underwater wet adhesionof mussel byssus, hydrogel particles which can adhere stably on the fracture rock surface in reservoir conditionscould achieve long-lasting reservoir control effect. In this work, the size-controllable biomimeticfunctional hydrogel particles were prepared by mechanical shearing after bulk hydrogel was constructedby catechol-functionalized polyacrylamide and phenolic resin crosslinking agent. The influence of solutionsalinity on the aggregation and adhesion of hydrogel particles was investigated via scanning electronmicroscope (SEM), colloidal probe atomic force microscope (AFM) and quartz crystal microbalance withdissipation (QCM-D). The results showed that hydrogel particles maintained well-dispersed state in lowsalinitywater, while exhibited significant adhesion and adsorption capacity to the silica surface in simulatedreservoir salinity water. This is of great importance to the practical applications that the hydrogelparticles would not show enhanced adhesion to rock surfaces until the reservoir salinity water was met,which was beneficial to the in-depth migration of hydrogel particles to achieve effective deep reservoirprofile control. Furthermore, the visible micro-model was designed and applied to evaluate profile controleffect of hydrogel particles, and the results showed that hydrogel particles could withstand waterflushing and adhere stably to the fracture surface. The waterflooding sweep efficiency was increasedremarkably from 20.3% ± 2.0% to 38.8% ± 2.0%. This work would help better understand the functionmechanism of hydrogel particles in reservoir control and provide novel and efficient method for the practicalapplication in enhanced oil recovery.
PCR-Based Detection of Densovirus Infection in Silkworm (Bombyx mori L.)
Hou Chengxiang,Li Muwang,Gui Zhongzheng,Xu Anying,Guo Xijie Korean Society of Sericultural Science 2005 International Journal of Industrial Entomology Vol.11 No.2
Two pairs of DNA primers were designed for the detection of the Zhenjiang (China) strain of Bombyx mori densonucleosis virus (BmDNV-Z). These primers were designed from the nucleotide sequence of major structural protein gene (putative VD1-ORF2). PCR amplification was attempted from different issues (including silk gland, blood, skin and midgut) and feces of the silkworm which infected wit BmDNV-Z were amplified by PCR. Both of the primers gave expected size of in the DNA bands from midgut and feces, but not in the DNA of silk gland, blood and skin. The two bands were sequenced, and their sequence were same as the sequence designed for. BmDNV-Z could be successfully detected in single silkworm after it was infected for 12 hrs, and could not be detected before 9 hrs after infected.