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Jie Li,Weiqiang Wang,Chengqing Wu,Zhongxian Liu,Pengtao Wu 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.42 No.3
This paper studies the lateral impact behavior of ultra-high performance fiber-reinforced concrete (UHPFRC) filled double-skin steel tubular (UHPFRCFDST) columns. The impact force, midspan deflection, and strain histories were recorded. Based on the test results, the influences of drop height, axial load, concrete type, and steel tube wall thickness on the impact resistance of UHPFRCFDST members were analyzed. LS-DYNA software was used to establish a finite element (FE) model of UHPFRC filled steel tubular members. The failure modes and histories of impact force and midspan deflection of specimens were obtained. The simulation results were compared to the test results, which demonstrated the accuracy of the finite element analysis (FEA) model. Finally, the effects of the steel tube thickness, impact energy, type of concrete and impact indenter shape, and void ratio on the lateral impact performances of the UHPFRCFDST columns were analyzed.
Extraction of chitin from white shrimp (Penaeus vannamei) shells using binary ionic liquid mixtures
Qiqi Dong,Weiqiang Qiu,Li Li,Ningping Tao,Ashley Liang Wang,Shanggui Deng,Yinzhe Jin 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.120 No.-
Binary ionic liquid mixtures (IL) were used for the first time to extract chitin from shrimp shells. Twoionic liquids, 1-ethyl-3-methylimidazole acetate ([EMIM][Ac]) and 1-butyl-3-methylimidazole bromidesalt ([BMIM][Br]), were mixed at ratios of 0:1, 1:1, 3:2, 4:1, and 1:0 and the properties of the IL andthe characteristics of extracted chitin were investigated. With an increase in proportion of [EMIM][Ac],the viscosity, dielectric constant, and dielectric loss of IL gradually decreased (p < 0.05), whereas the conductivity,radius of gyration increased (p < 0.05). The best quality of chitin using IL (3:2) was achievedwhen the viscosity, conductivity, and radius of gyration were 0.16 ± 0.00 Pa s, 0.30 ± 0.01 S/m, and 0.10 ± 0.00 nm, respectively. The yield of chitin extraction using IL was 35.72 ± 0.31 %, and this was approximately2.04 times higher than that using the acid-base method (17.50 ± 0.16 %). The Whiteness index(WI) of chitin extracted using IL (3:2) (94.93 ± 0.09) was better than commercial chitin (93.31 ± 0.11),and the secondary structure, surface morphology and thermal stability were similar to commercial chitin. Therefore, the binary ionic liquid mixture can be used as an effective green solvent to extract chitin fromshrimp shells.
Character Formulae for Queer Lie Superalgebras and Canonical Bases of Types A/C
Cheng, Shun-Jen,Kwon, Jae-Hoon,Wang, Weiqiang Springer-Verlag 2017 Communications in mathematical physics Vol. No.
<P>For the BGG category of -modules of half-integer weights, a Kazhdan-Lusztig conjecture A la Brundan is formulated in terms of categorical canonical basis of the nth tensor power of the natural representation of the quantum group of type C. For the BGG category of -modules of congruent non-integral weights, a Kazhdan-Lusztig conjecture is formulated in terms of canonical basis of a mixed tensor of the natural representation and its dual of the quantum group of type A. We also establish a character formula for the finite-dimensional irreducible -modules of half-integer weights in terms of type C canonical basis of the corresponding q-wedge space.</P>
Zhaotao Gao,Dehao Qu,Yanpeng Qu,Weiqiang Wang,Shurui Cui,Hongxiao Guo,Fei Li,Fayu Sun 한국섬유공학회 2022 Fibers and polymers Vol.23 No.3
In this work, a novel jig dyeing apparatus for dyeing polyester with supercritical carbon dioxide was designed andsuccessfully constructed. The built-in dye boxes set inside and guide roller to increase the exposure area of single layer fabricwere the two most attractive features of the equipment. Polyester was dyed at a temperature of 130 oC, the pressure of27 MPa. The colorfastness was analyzed as a function of polyester running speed. Under the condition that the polyester'srunning speed was 4 m/s, the fastness to staining, the fastness to fading, and the fastness to rubbing were rated at a grade of 3-4, 4-5, and 4, respectively. Dyeing properties complied with the expected requirements.
Irreducible characters of Kac–Moody Lie superalgebras
Cheng, Shun-Jen,Kwon, Jae-Hoon,Wang, Weiqiang Oxford University Press 2015 Proceedings of the London Mathematical Society Vol.110 No.1
<P>Generalizing the super duality formalism for finite-dimensional Lie superalgebras of type ABCD, we establish an equivalence between parabolic Bernstein-Gelfand-Gelfand (BGG) categories of a Kac-Moody Lie superalgebra and a Kac-Moody Lie algebra. The characters for a large family of irreducible highest weight modules over a symmetrizable Kac-Moody Lie superalgebra are then given in terms of Kazhdan-Lusztig polynomials for the first time. We formulate a notion of integrable modules over a symmetrizable Kac-Moody Lie superalgebra via super duality, and show that these integrable modules form a semisimple tensor subcategory, whose Littlewood-Richardson tensor product multiplicities coincide with those in the Kac-Moody Lie algebra setting.</P>
A new hybrid model for MR elastomer device and parameter identification based on improved FOA
Yang Yu,Amir M. Yousefi,Kefu Yi,Jianchun Li,Weiqiang Wang,Xinxiu Zhou 국제구조공학회 2021 Smart Structures and Systems, An International Jou Vol.28 No.5
A new hysteresis model based on curve fitting method is presented in this work to portray the greatly nonlinear and hysteretic relationships between shear force and displacement responses of the magnetorheological (MR) elastomer base isolator. Compared with classical hysteresis models such as Bouc-Wen or LuGre friction model, the proposed model combines the hyperbolic sine function and Gaussian function to model the hysteretic loops of the device responses, contributing to a great decline of model parameters. Then, an improved fruit fly optimization algorithm (FOA) is proposed to optimize the model parameters, in which a self-adaptive step is employed rather than the fixed step to balance the global and local optimum search abilities of algorithm. Finally, the experimental results of the device under both harmonic and random excitations are used to verify the performance of the proposed hybrid model and parameter identification algorithm with the satisfactory results.