http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Long, Zhi,Gao, Liqin,Li, Yankai,Kang, Baotao,Lee, Jin Yong,Ge, Junjie,Liu, Changpeng,Ma, Shuhua,Jin, Zhao,Ai, Hongqi American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.44
<P>The self-assembly powder (SAP) with varying Nafion content was synthesized and characterized by XRD, XPS, HRTEM, and mapping. It is observed that the oxygen from oxygen functional groups transfers to the surface of Pt and generate PtO during the process of self-assembly with the mechanism of micro galvanic cell, where Pt, carbon black, and Nafion act as the anode, cathode and electrolyte, respectively. The appearance of PtO on the surface of Pt leads to a turnover of Nafion structure, and therefore more hydrophilic sulfonic groups directly contact with Pt, and thus the triple-phase boundary (TPB) has been expanded.</P>
Yong Hu,Fei Liu,Longzhi Zhao,Yanchuan Tang,Haitao Jiao 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.5
Al15Mg45Li39Ca0.5Si0.5 LW-HEAs with a density of 1.45 g/cm3 was designed and fabricated by magnetic suspension furnace. The non-dendritic globular microstructures of Al15Mg45Li39Ca0.5Si0.5LW-HEAs were prepared by isothermal heat treatment,and the effects of isothermal temperatures and holding times on the microstructures of semi-solid Al15Mg45Li39Ca0.5Si0.5LW-HEAs were investigated by optical microscope and scanning electron microscope. The results indicate that the phasesof Al15Mg45Li39Ca0.5Si0.5LW-HEAs consist of HCP phases and intermetallic compounds. With the increase of isothermaltemperature, the average grain size increases and the shape factor increases first and then decreases. With the prolongationof holding time, the average grain size increases first, then decreases and then increases again, and the shape factor alsoincreases first and then decreases. The semi-solid Al15Mg45Li39Ca0.5Si0.5LW-HEAs have a low coarsening coefficient. Compared with the as-cast Al15Mg45Li39Ca0.5Si0.5LW-HEAs, the ultimate strength, plasicity and hardness of smei-solidAl15Mg45Li39Ca0.5Si0.5LW-HEAs are improved by 25.7%, 18.5% and 89.7%, respectively.
Yongli Qiao,Wenzhu Jiang,Md Lutfor Rahman,추상호,Rihua Piao,Longzhi Han,고희종 한국분자세포생물학회 2008 Molecules and cells Vol.25 No.3
Comparison of maps and QTLs between populations may provide us with a better understanding of molecular maps and the inheritance of traits. We developed and used two reciprocal BC1F1 populations, IP/DS//IP and IP/DS//DS, for QTL analysis. DS (Dasanbyeo) is a Korean tongil-type cultivar (derived from an indica x japonica cross and similar to indica in its genetic makeup) and IP (Ilpumbyeo) is a Korean japonica cultivar. We constructed two molecular linkage maps corresponding to each backcross population using 196 markers for each map. The length of each chromosome was longer in the IP/DS//IP population than in the IP/DS//DS population, indicating that more recombinants were produced in the IP/DS//IP population. Distorted segregation was observed for 44 and 19 marker loci for the IP/DS//IP and IP/DS//DS populations, respectively; these were mostly skewed in favor of the indica alleles. A total of 36 main effect QTLs (M-QTLs) and 15 digenic epistatic interactions (E-QTLs) were detected for the seven traits investigated. The phenotypic variation explained (PVE) by M-QTLs ranged from 3.4% to 88.2%. Total PVE of the M-QTLs for each trait was significantly higher than that of the E-QTLs. The total number of M-QTLs identified in the IP/DS//IP population was higher than in the IP/DS//DS population. However, the total PVE by the M-QTLs and E-QTLs together for each trait was similar in the two populations, suggesting that the two BC1F1 populations are equally useful for QTL analysis. Maps and QTLs in the two populations were compared. Eleven new QTLs were identified for SN, SF, GL, and GW in this study, and they will be valuable in marker-assisted selection, particularly for improving grain traits in tongil-type varieties.
진중현,김정희,Wenzhu Jiang,Sang-Ho Chu,우미옥,Longzhi Han,Darshan Brar,고희종 한국작물학회 2007 Journal of crop science and biotechnology Vol.10 No.3
Two subspecies, japonica and indica, have been reported in rice, which differ in several ecotypic traits. However, reproductive barriers in hybrid progenies between subspecies have been major obstacles in breeding programs using inter-subspecific hybridization. As the first step to elucidate the reproductive barriers, we developed subspecies-specific (SS) STS markers in this study. A total of 765 STS primers were designed through comparing DNA sequences at every 2~3cM interval between japonica and indica rices, which are available at Web DBs such as IRGSP, NCBI, TIGR, and GRAMENE, and tested for subspecies-specificity using 15 indica and 15 japonica varieties of diverse origin. Of them, 67 STS markers were identified as SS STS markers and their subspecies-specificity scores were estimated. The SS markers were dispersed throughout the genome along chromosomes. Of them, 64 SS markers were mapped on an RIL population derived from a Dasanbyeo (indica) / TR22183 (japonica) cross. Genomic inclination of RILs was evaluated based on the genotyping with different types of markers. Association test between markers and segregation distortion revealed that segregation distortion might not be the cause of generating SS markers. The SS markers will be applicable to estimate the genomic inclination of varieties or lines and to study the differentiation of indica and japonica, and ultimately to breed true hybrid rice varieties in which desirable characters from both subspecies are recombined.
Jinxin Wang,Rongsheng Jiang,Zhanwen Wu,Zhaolong Zhu,Longzhi Yang,Pingxiang Cao 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.3
Metal oxide reinforced composite, as a new kind of engineering material, was an essential research topic to industry. Magnesium oxide as particle-reinforced phase, were mixed with wood fiber-matrix to enhance the mechanical properties of composite. However, the research on the surface quality of this composite is still desirable for expanding its application. In order to investigate the surface integrity of this kind particle-reinforced wood-based composite, spiral up-milling experiments were performed with different cutting depth and cutting speed. The effect of cutting speed and cutting depth on surface integrity was investigated. According to the calculation results of black pixels proportion of binary image of machined surface, surface defects were greatly affected by cutting depth rather than cutting speed. Defects, such as pile-up and debonding of particles, were usually observed under 0.5 mm cutting depth, meanwhile, extensive damage of flacking and fracture of wood fiber-matrix were usually observed under 1.5 mm cutting depth. In all, the machined surface formation mechanism of this composite can be different by changing cutting depth.
Wenzhu Jiang,Yong-Mei Jin,이주현,Kang-Ie Lee,Rihua Piao,Longzhi Han,Jin-Chul Shin,Rong-De Jin,Tiehua Cao,Hong-Yu Pan,Xinglin Du,고희종 한국분자세포생물학회 2011 Molecules and cells Vol.32 No.6
Low temperature is one of the major environmental stress-es in rice cultivation in high-altitude and high-latitude regions. In this study, we cultivated a set of re-combinant inbred lines (RIL) derived from Dasanbyeo (indica) / TR22183 (japonica) crosses in Yanji (high-latitude area), Kunming (high-altitude area), Chuncheon (cold water irrigation) and Suwon (normal) to evaluate the main effects of quantitative trait loci (QTL) and epistatic QTL (E-QTL) with regard to their interactions with environments for cold-related traits. Six QTLs for spikelet fertility (SF) were identified in three cold treatment locations. Among them, four QTLs on chromosomes 2, 7, 8, and 10 were validated by several near isogenic lines (NILs) under cold treatment in Chuncheon. A total of 57 QTLs and 76 E-QTLs for nine cold-related traits were identified as distributing on all 12 chromosomes; among them, 19 QTLs and E-QTLs showed significant interactions of QTLs and envi-ronments (QEIs). The total phenotypic variation explained by each trait ranged from 13.2 to 29.1% in QTLs, 10.6 to 29.0% in E-QTLs, 2.2 to 8.8% in QEIs and 1.0% to 7.7% in E-QTL environment interactions (E-QEIs). These results demonstrate that epistatic effects and QEIs are important properties of QTL parameters for cold tolerance at the reproductive stage. In order to develop cold tolerant varieties adaptable to wide-ranges of cold stress, a strategy facilitating marker-assisted selection (MAS) is being adopted to accumulate QTLs identified from different environments.
Dejia Liu,Mingxue Shen,Yanchuan Tang,Yong Hu,Longzhi Zhao 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.5
Multipass friction stir processing (FSP) can result in a homogeneous microstructure and significant improvement in mechanicalproperties of magnesium alloys. Few studies have concentrated on the surface properties of Mg–Zn–Zr alloy duringmultipass FSP. The aim of this study was to investigate the microstructure evolutions as well as the effects on the surfacecorrosion and wear resistance of ZK60 plates during multipass FSP. An interesting finding is that FSP can significantly refinethe grains and improve the surface properties of ZK60 alloy. However, subsequent passes of FSP cannot further reduce thegrain size in the stir zone, but they cause an increase in the grain size in the ZK60 alloy. In addition, the subsequent passesof FSP are not beneficial, but rather are, harmful to the corrosion resistance of ZK60 alloy. There is little positive effect onthe improvement in the wear resistance of ZK60 plates.
Dejia Liu,Rui Guo,Yong Hu,Mingxue Shen,Yanchuan Tang,Longzhi Zhao,Deying Li,Xiangjie Wang 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.6
High-entropy alloys having excellent properties are particularly suitable for the application as the filler metals in welding. In the present study, multi-component mixed powders of FeCoCrNiMn and CrFeNi2.4Al0.6,based on a high-entropy design,as well as the comparative 316L stainless steel powders, were used as the filler metals, to achieve the dissimilar weldingbetween 304 stainless steel and SMA490BW steel by laser deposition welding. By comparative analysis of the microstructureand mechanical properties of three types of joints, the feasibility and weld-ability of the filler metal powders based on ahigh-entropy design were studied. It was found that the melting of base metal (BM) and weld metal dilution had an impacton the set high-entropy component in the weld zone. And high-entropy structures were achieved in the weld zone by usingthe powders of CrFeNi2.4Al0.6. Compared to the BM of SMA490BW steel, three types of joints presented a higher notchedtensile strength and had a better corrosion resistance. The joint welded using the powders of CrFeNi2.4Al0.6had the lowesthardness value in the weld zone, in which the joint was fractured during the notched tensile tests. The other two jointsfractured near the notch in the SMA490BW steel side. Transgranular fracture and a typical dimple fracture were observedin the fractured joints.