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Effect of Al on the Microstructure and Mechanical Properties of Mg–Sn–Ca–Mn Wrought Alloy
Yun Feng,Yuanyuan Yang,Zongqi Xiao,Xianglong Meng,Guorong Zhou,Jinfeng Leng,Xinying Teng 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.6
Mg–Sn–Ca–Mn–xAl (x = 0,1.5 wt%) alloys with ultra-fine recrystallized grains were prepared by conventional extrusion(400 °C, 0.5 mm/s). Effects of aluminum (Al) on mechanical properties and microstructure of the Mg–1Sn–1Ca–0.5Mn(wt%) alloy were systematically investigated. By the addition of 1.5 wt% Al, the yield strength of the as-extruded alloysignificantly increased from 183 to 237 MPa. The as-cast alloys show a dendritic structure consists of α-Mg, (Mg, Al)2Ca,and CaMgSn phases. The as-extruded Mg–1Sn–1Ca–0.5Mn–1.5Al alloys exhibit a bimodal grain structure composed ofdynamic recrystallized (DRXed) fine grains and coarse unDRXed grains. Compared with Al free alloy, a lot of nano-scaleplanar Al2Caand rectangle shape Al8Mn5precipitated in the as-extruded alloy with 1.5 wt% Al. Meanwhile, the addition ofAl significantly strengthened alloys’ fiber texture with < 10–10 >//ED.
Xiaoping Lu,Jinfeng Yun,Shuyan Wang 한국초지조사료학회 2009 한국초지조사료학회 학술대회논문집 Vol.2009 No.08
Sorghum-Sudan grass which is an annual forage grass in Gramineae have been bred for biomass promotion. The recombinant inbred line (RIL) populations were derived from the F2:3 genetic mapping population of Sorghum 314A×zongke Sudan grass. The breeding selection based on agronomic characters and DNA molecular marker statistical analysis was carried among the progenies of the RIL populations, and 9 recombinant breeding progenies were determined as heterobeltiosis with high yield. According to DNA diversity analysis of simple sequence of repeats(SSR) marker, the genetic varieties were abundant among the families, and the recombinant breeds of high yield were distributed among the different RIL populations.2 family lines, which have similar agronomic characters and yield, and whose genetic distance nearly equal to zero, showed difference on arid tolerance. 4 breeding lines were selected on agronomic characters and resistance in the field trials, and 2 breed lines were qualified for the regional testing.
Mingna Huang,Yun Hu,Jinfeng Yu,Jicheng Sun,Ye Ming,Leilei Zheng 대한치과교정학회 2017 대한치과교정학회지 Vol.47 No.5
Objective: Treating Class II subdivision malocclusion with asymmetry has been a challenge for orthodontists because of the complicated characteristics of asymmetry. This study aimed to explore the characteristics of dental and skeletal asymmetry in Class II subdivision malocclusion, and to assess the relationship between the condyle-glenoid fossa and first molar. Methods: Conebeam computed tomographic images of 32 patients with Class II subdivision malocclusion were three-dimensionally reconstructed using the Mimics software. Forty-five anatomic landmarks on the reconstructed structures were selected and 27 linear and angular measurements were performed. Paired-samples t -tests were used to compare the average differences between the Class I and Class II sides; Pearson correlation coefficient (r) was used for analyzing the linear association. Results: The faciolingual crown angulation of the mandibular first molar (p < 0.05), sagittal position of the maxillary and mandibular first molars (p < 0.01), condylar head height (p < 0.01), condylar process height (p < 0.05), and angle of the posterior wall of the articular tubercle and coronal position of the glenoid fossa (p < 0.01) were significantly different between the two sides. The morphology and position of the condyle-glenoid fossa significantly correlated with the three-dimensional changes in the first molar. Conclusions: Asymmetry in the sagittal position of the maxillary and mandibular first molars between the two sides and significant lingual inclination of the mandibular first molar on the Class II side were the dental characteristics of Class II subdivision malocclusion. Condylar morphology and glenoid fossa position asymmetries were the major components of skeletal asymmetry and were well correlated with the three-dimensional position of the first molar.
Wang Junjie,Yun Jinfeng,Lv Shijie,Wang Hongmei 한국초지조사료학회 2009 한국초지조사료학회 학술대회논문집 Vol.2009 No.08
39 accessions of sickle alfalfa (Medicago falcata L.) collected from different regions of China were evaluated for their tolerance to drought. Differences were observed among accessions in their reactions to drought and 8 good tolerant accessions at populations level and 18 excellent tolerant accessions at individual level were identified based on drought response index (DRI).