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Hot Deformation Behavior and Recrystallization Mechanism in an As-Cast CoNi-Based Superalloy
Yong Guan,Yongchang Liu,Zongqing Ma,Huijun Li,Hongyao Yu 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.6
The hot deformation behavior of as-cast CoNi-based superalloy was investigated by means of hot compression tests. Thecorresponding microstructure evolution after hot deformation was examined by optical microscope, as well as the TEMtechnique. The constitutive equation and processing map as a function of deformation temperature and strain rate were developed. Results show that the efficiency peak of the processing map is 0.38 at the temperature of 1130 °C and the strain rate of0.01 s−1. The discontinuous dynamic recrystallization (DDRX) related to the strain-induced grain boundary migration (SIBM)is the dominant recrystallization mechanism during hot working. Meanwhile, the DRX also occurs by forming sub-grainsaround MC carbides and shear band. In addition, the existence of fine γ′ precipitates are found to retard the recrystallization.
RO 및 NF막에서의 부식질에 의한 Fouling 및 미량오염물질의 제거
왕창근,차준철,이용현,김수동,류주환 대한상하수도학회 2004 상하수도학회지 Vol.18 No.1
This study investigated the phenomena of membrane fouling by NOM and the effect of the fouling on removal of micro-pollutants. NOM has a great effect on decline of permeate flux. Permeate flow rate was reduced by 88% in RO and 34.8% in NF for 323hr operation period. Removal rate of UV_(254), is 87.4% in RO and 78.5% in NF and removal rate of DOC is 42.7% in RO and 32.9% in NF for 2㎎/l humic acid. Removal efficiency of the micmpollutants by the RO and NF membranes fouled by humic acid was mostly lower than that by the new membrane. The concentration polarization which affects the flux and the rejection was thought to occur in the active layer of the membrane, as the membrane was getting fouled.
$FSI$-ideals and $FSC$-ideals of BCI-algebras
Yong Lin Liu,San Yang Liu,Jie Meng 대한수학회 2004 대한수학회보 Vol.41 No.1
The notions of FSI-ideals and FSC-ideals in BCI-algebras areintroduced. The characterization properties of FSI-ideals andFSC-ideals are obtained. We investigate the relations betweenFSI-ideals (resp. FSC-ideals) and other fuzzy ideals, betweenFSI-ideals (resp. FSC-ideals) and BCI-algebras, and show thata fuzzy subset of a BCI-algebra is an FSI-ideal if and only ifit is both an FSC-ideal and a fuzzy BCI-positive implicativeideal.
Incremental fuzzy clustering based on a fuzzy scatter matrix
Yongli Liu,Hengda Wang,Tianyi Duan,Jingli Chen,Hao Chao 한국정보처리학회 2019 Journal of information processing systems Vol.15 No.2
For clustering large-scale data, which cannot be loaded into memory entirely, incremental clustering algorithmsare very popular. Usually, these algorithms only concern the within-cluster compactness and ignore thebetween-cluster separation. In this paper, we propose two incremental fuzzy compactness and separation (FCS)clustering algorithms, Single-Pass FCS (SPFCS) and Online FCS (OFCS), based on a fuzzy scatter matrix. Firstly, we introduce two incremental clustering methods called single-pass and online fuzzy C-meansalgorithms. Then, we combine these two methods separately with the weighted fuzzy C-means algorithm, sothat they can be applied to the FCS algorithm. Afterwards, we optimize the within-cluster matrix and betweenclustermatrix simultaneously to obtain the minimum within-cluster distance and maximum between-clusterdistance. Finally, large-scale datasets can be well clustered within limited memory. We implemented experimentson some artificial datasets and real datasets separately. And experimental results show that, compared withSPFCM and OFCM, our SPFCS and OFCS are more robust to the value of fuzzy index m and noise.
Incremental Fuzzy Clustering Based on a Fuzzy Scatter Matrix
Liu, Yongli,Wang, Hengda,Duan, Tianyi,Chen, Jingli,Chao, Hao Korea Information Processing Society 2019 Journal of information processing systems Vol.15 No.2
For clustering large-scale data, which cannot be loaded into memory entirely, incremental clustering algorithms are very popular. Usually, these algorithms only concern the within-cluster compactness and ignore the between-cluster separation. In this paper, we propose two incremental fuzzy compactness and separation (FCS) clustering algorithms, Single-Pass FCS (SPFCS) and Online FCS (OFCS), based on a fuzzy scatter matrix. Firstly, we introduce two incremental clustering methods called single-pass and online fuzzy C-means algorithms. Then, we combine these two methods separately with the weighted fuzzy C-means algorithm, so that they can be applied to the FCS algorithm. Afterwards, we optimize the within-cluster matrix and betweencluster matrix simultaneously to obtain the minimum within-cluster distance and maximum between-cluster distance. Finally, large-scale datasets can be well clustered within limited memory. We implemented experiments on some artificial datasets and real datasets separately. And experimental results show that, compared with SPFCM and OFCM, our SPFCS and OFCS are more robust to the value of fuzzy index m and noise.
Optimization of preparation and properties of Gardenia yellow pigment-loaded alginate beads
Yong Liu,Qing Zhou,Yan-Mei He,Xiu-Yun Ma,Lin-Na Liu,Yong-Jian Ke 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.8
Gardenia yellow pigment (GYP) loaded alginate beads were prepared by the ionic gelation technique, and the preparation parameters were optimized by response surface methodology for high encapsulation efficiency. The optimized parameters were alginate concentration of 3.3%, CaCl2 concentration of 2.4%, and GYP concentration of 3.2mg/mL, under which the encapsulation efficiency was 73.61%. The surface morphology and bead size analysis showed that the GYP-loaded alginate beads had a roughly spherical morphology with a wrinkled surface, and their average diameter was 0.87 mm. In vitro release test revealed that the GYP release had a pH-dependent release profile and a two-step release process. The Rigter-Peppas model was the most proper model to assess the GYP release from alginate beads. The release mechanism of GYP at pH 1.2 and 7.4 was non-Fickian transport and case-II transport, respectively. The 2,2-diphenyl-1-picrylhydrazyl assay indicated that the encapsulated GYP had effectively maintained 82.56% of the antioxidant activity.
FSI-IDEALS AND FSC-IDEALS OF BCI-ALGEBRAS
Liu, Yong-Lin,Liu, San-Yang,Meng, Jie Korean Mathematical Society 2004 대한수학회보 Vol.41 No.1
The notions of FSI-ideals and FSC-ideals in BCI-algebras are introduced. The characterization properties of FSI-ideals and FSC-ideals are obtained. We investigate the relations between FSI-ideals (resp. FSC-ideals) and other fuzzy ideals, between FSI-ideals (resp. FSC-ideals) and BCI-algebras, and show that a fuzzy subset of a BCI-algebra is an FSI-ideal if and only if it is both an FSC-ideal and a fuzzy BCI-positive implicative ideal.