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Jianmin Peng,Letian Qi,Guihua Yang,Ming He,Yu Xue,Jiuachuan Chen 한국펄프·종이공학회 2019 펄프.종이기술 Vol.51 No.2
In this work, the application of ionic liquid (IL) and ultrasonic (Ul) treatment on the bleachability and properties of eucalyptus kraft pulp were investigated. The results showed that ILs protected fibers from depolymerization by improving the pulp viscosity. The combination of Ul and IL treatment notably reduced the kappa number and improved tensile index, burst index, tear strength index and folding endurance of pulp. Ul and IL treatment reduced the fines content, decrease the water retention value (WRV) and cause the formation of crosslinks between fibers, especially in Ul+[TEA][HSO4] treatment. The XRD and FT-IR analysis illustrated the combination of Ul and IL treatment disturbed the amorphous region of pulp fiber by increasing of crystallinity and no chemical change appeared in the treatment process. The Ul assisted IL treatment technology will have a promising application due to its high efficiency and environmental protection character.
An Improved Subdomain Model for Magnetic Field Calculation of SPMSM Considering No-load Leakage Flux
Zhanyang Yu,Yanli Qi,Yongteng Jing,Jianmin Du,Jin Wang 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.6
Due to big leakage fl ux, the performance of permanent magnet (PM) motor will be much reduced. Especially for surfacemounted permanent magnet synchronous motor (SPMSM) with similar number of poles and slots, because the zigzag leakage fl ux is big and varies with the relative positions between stator and rotor, selecting no-load leakage fl ux coeffi cient with experience may cause a big calculation error to electromagnetic parameters by equivalent magnetic circuit model. Finiteelement method (FEM) can directly calculate the coeffi cient, but entire process is time-consuming. Focusing on this problem, an analytical model of no-load leakage fl ux coeffi cient is proposed including air-gap leakage fl ux model and zigzag leakage fl ux model. Then, an improved subdomain model for magnetic fi eld calculation of SPMSM is established, and the air-gap magnetic fl ux density, inducing fl ux linkage and line no-load back electromotive force (EMF) are calculated considering no-load leakage fl ux. To verify the improved model, an external rotor type SPMSM with 20-poles and 24-slots for bridge crane is designed and manufactured. Finally, the validity of improved model is verifi ed by experimental test.
Li Maoteng,Xiang Jun,Liu Jianmin,Yu Longjiang,Li Dianrong 한국유전학회 2008 Genes & Genomics Vol.30 No.2
The Brassica napus-B genome monosomic addition lines (MALs) (AACC + B’, 2n = 39) were developed from self-pollination of pentaploid hybrids (AABCC) that were derived from hybridization between hexaploid hybrids (AABBCC) and B. napus (AACC). The alien chromosomes of the B genome in MALs were identified by the GISH technique, by observation of the meiotic behavior of pollen mother cells (PMCs), and by B-genome-specific molecular marker analysis. Studies of the meiotic behavior of B. napus-B genome chromosome MALs at diakinesis revealed that the majority of the chromosome configuration was 19²+1¹, which indicated that the alien B genome chromosome remained univalent in most cases. The laggard-free PMCs also appeared at a lower ratio, which indicated that the B genome chromosome could be transmitted into gametes. The chromosome configurations of 20² and 19²+2¹ that appeared in double MALs (AACC+ 2 chromosomes of the B genome) indicated different homoeology between different B genome chromosomes. The paired B genome bivalent in double MALs can be normally segregated at anaphase in most cases. PMCs with multivalents were observed in all the double MAL combinations, which indicated homology of the B genome chromosomes with the A or C genome chromosomes. The Brassica napus-B genome monosomic addition lines (MALs) (AACC + B’, 2n = 39) were developed from self-pollination of pentaploid hybrids (AABCC) that were derived from hybridization between hexaploid hybrids (AABBCC) and B. napus (AACC). The alien chromosomes of the B genome in MALs were identified by the GISH technique, by observation of the meiotic behavior of pollen mother cells (PMCs), and by B-genome-specific molecular marker analysis. Studies of the meiotic behavior of B. napus-B genome chromosome MALs at diakinesis revealed that the majority of the chromosome configuration was 19²+1¹, which indicated that the alien B genome chromosome remained univalent in most cases. The laggard-free PMCs also appeared at a lower ratio, which indicated that the B genome chromosome could be transmitted into gametes. The chromosome configurations of 20² and 19²+2¹ that appeared in double MALs (AACC+ 2 chromosomes of the B genome) indicated different homoeology between different B genome chromosomes. The paired B genome bivalent in double MALs can be normally segregated at anaphase in most cases. PMCs with multivalents were observed in all the double MAL combinations, which indicated homology of the B genome chromosomes with the A or C genome chromosomes.
Zhaocan Li,Guoqin Wu,Yunfang Liu,Jianmin Yu 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.11
The grain refinement and second phases evolution of Mg-13Gd-4Y-2Zn-0.4Zr sheet during the rotary forward extrusion(RFE) process were investigated. The microstructures were observed by using optical microscopy, scanning electron microscopy,electron backscatter diffraction, X-ray diffractometer, and transmission electron microscope. The result shows, the modifiedcellular automata model fully considers the influence of long-period stacking ordered phase on the dislocation density,which can predict the grain size evolution of Mg-Gd-Y-Zn-Zr alloy during the RFE process, and the relative error can becontrolled within 10%. With the increase of RFE revolutions, the average grain size firstly decreases quickly (RFE1–RFE25),and then increased gradually (RFE25–RFE100). The decreased grain size is related to the enhanced dynamic recrystallizationprocess as the c-axis of most grains is rotated continuously to a transverse direction and more random texture types areformed. The increase in grain size is linked with the solid solution of the second phase, and the limitation on grain growthdue to the pinning effect of the second phase almost disappears. In the early stage (RFE1–RFE25), the contribution percentageof grain refinement and solid solution strengthening to microhardness improvement is 180.6% and 61.7%, respectively. In the subsequent stage (RFE25–RFE100), the dislocation density strengthening and solid solution strengthening accountsfor 60% and 440% of the increase in microhardness, respectively.