Reinforced quantum-behaved particle swarm-optimized neural network for cross-sectional distortion prediction of novel variable-diameter-die-formed metal bent tubes

Wang Caicheng,Wang Zili,Zhang Shuyou,Liu Xiaojian,Tan Jianrong 한국CDE학회 2023 Journal of computational design and engineering Vol.10 No.3

With light weight, high strength, and high performance, metal bent tubes have attracted increasing applications in aeronautics. However, the growing demand for customized tubular parts has led to a significant increase in the cost of conventional tube-bending processes, as they can only process tubes of a specific diameter. To this end, this paper proposes a variable diameter die (VDD) scheme which can bend tubes with a specific range of diameters. To investigate the formability of VDD-processed tubes for practical VDD applications, an accurate and reliable prediction method of cross-sectional distortion is imperative. Hence, we pioneer a novel intelligent model based on quantum-behaved particle swarm optimization (QPSO)-optimized back-propagation neural network (BPNN) to predict a rational cross-sectional distortion characterization index: average distortion rate. The adaptive adjustment of coefficients and the Gaussian distributed random vector are introduced to QPSO, which balance the search and enhance the diversity of the population, respectively. For further improvement in optimization performance, the informed initialization strategy is applied to QPSO. The efficiency of the proposed reinforced QPSO (RQPSO)-optimized BPNN model is evaluated by comparing the results with those of the BPNN, BPNN with Xavier initialization, several different particle swarm optimization variants-optimized BPNN models, and variants of popular machine learning models. The results indicated the superiority of RQPSO over other methods in terms of the coefficient of determination (${R}^2$), variance account for, root mean square error (MSE), mean absolute error, and standard deviation of MSE. Thus, the proposed novel algorithm could be employed as a reliable and accurate technique to predict the cross-sectional distortion of VDD-processed tubes.

Filamin A is required for spindle migration and asymmetric division in mouse oocytes

Wang, HaiYang,Guo, Jing,Lin, ZiLi,Namgoong, Suk,Oh, Jeong Su,Kim, Nam-Hyung The Federation of American Societies for Experimen 2017 The FASEB Journal Vol.31 No.8

<P>Dynamic changes in the actin network are crucial for the cortical migration of spindles and establishment of polarity, to ensure asymmetric division during meiotic maturation. In this study, filamin A (FLNA) was found to be an essential actin regulator that controlled spindle migration and asymmetric division during oocyte meiosis. FLNA was localized in the cytoplasm and enriched at the cortex and near the chromosomes. Knockdown of FLNA impaired meiotic asymmetric division and spindle migration with a decrease in the amount of cytoplasmic actin mesh and cortical actin levels. Moreover, FLNA knockdown reduced the phosphorylation of cofilin and Rho kinase (ROCK) near the spindle. Similar phenotypes, such as decreased filament actin levels, impaired spindle migration and polar body extrusion, were observed when active cofilin (S3A) was overexpressed or ROCK was inhibited. Notably, we found that FLNA and ROCK interacted directly in mouse oocytes. Taken together, our results show that FLNA plays crucial roles in asymmetric division during meiotic maturation by regulating ROCK-cofilin-mediated actin reorganization.</P>

Modeling poroelastic effect on borehole stability for under-balanced and over-balanced drilling conditions

Zili Qi,Pawel A. Nawrocki,Dong Wang 한국자원공학회 2013 Geosystem engineering Vol.16 No.1

Since rock formations are always saturated by fluids, the coupled poroelastic models were developed to conduct wellbore stability analysis. The analysis based on this theory allows us to consider phenomena such as well communication with rock formation, change of pore pressure profile, pore pressure dissipation, etc. This article presents the analytical solution of one coupled poroelastic model and then departs to consider two common drilling scenarios, which are under-balanced drilling (UBD) and over-balanced drilling (OBD). Obtained results show that the phenomena of time-dependent delayed failure and failure initiation taking place not only at the wellbore wall but also inside the formation can be predicted by virtue of the coupled model. Moreover, these two phenomena are different for the two drilling scenarios mentioned above. Regarding the (UBD), the borehole stability status will get enhanced with time due to the poroelastic effect in the formation. On the contrary, the borehole stability status will get worse, and time-delayed failure may happen for the OBD.

Field Test on Uplift Bearing Capacity of Rock-Socketed Belled Piles

Qinke Wang,Jianlin Ma,Zili Xiao,Wenlong Chen,Yukun Ji 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.8

The thick sandstone with an upper layer of clay (2 m to 3 m) was identified at the transmission line projects in western China. Tower foundations are affected by extreme weather such as strong wind and snow all the year round, so the research of foundation uplift is very significant. Belled piles are widely used in the area due to its high uplift bearing capacity, however, further research studies regarding the uplift bearing capacity of the belled piles in this special scenario still need to be conducted. The uplift bearing characteristics of five rock-socketed belled piles were studied by field testing method. The load-displacement curves, fitting analysis of load-displacement curves, change rate of pullout stiffness, distribution of axial force alone the pile, and pile side friction were analyzed. Observation results show that the load-displacement curves of rock-socketed belled piles are steeply changed. Moreover, we find that the hyperbolic model can provide a good fitting result for load-displacement curves, and the ultimate uplift bearing capacity is suggested to be predicted by using a reduction parameter of 0.64 − 0.85. Both uplift bearing capacity coefficient Nu and utilization ratio of pile material ηincrease with the increase of L/d under a same diameter, while the growth rate decreases. In this paper, the significant size effect is observed with increasing of pile diameter. The change rate of pullout stiffness-displacement curves are consistent with the trend of the safety factor-displacement curves, and can be fitted by power function model. Additionally, the change rate of pullout stiffness at the limit state will decrease to around 154 in this study, which can be used as the instability threshold for the rock-socketed belled piles in a similar soil foundation.

Strong Cube Texture Formation in Heavily Cold-Rolled Ni8W/Ni12W/Ni8W Composite Alloy Substrates Used in YBCO Coated Conductors

Yaotang Ji,Hongli Suo,ZiLi Zhang,Lin Ma,Jiazhi Li,Chengxi Zhang,Xingyu Wu,Shaheen Kausar,Jin Cui,Min Liu,Yi Wang,Qiuliang Wang 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5

Three types of Ni8W/Ni12W/Ni8W composite substrates with strong cube texture, high yield strength, and low magnetizationwere produced by heavy cold rolling and annealing processes. The three types of composite substrates have the same thickness,but the ratios of thickness between Ni–8 at%W and Ni–12 at%W layer are different. The contents of tungsten exceed9.3 at%, 10 at%, and 10.3 at% in the three types of obtained substrates. The presence of Ni alloys with higher W content inthe Ni–12 at%W of the three composite substrates strongly enhanced the mechanical properties with about 290, 300 and315 MPa respectively, and decreased the ferromagnetic behavior of the whole substrates. Additionally, it was found that anarea that enhances cubic nucleation and growth in the Ni8W layer of composite substrates.

Promotion or Prevention? The Moderating Effect of Embedded External Reviews on Consumer Evaluations

Ziqiong Zhang,Le Wang,Shuchen Qiao,Zili Zhang Smart Tourism Research Center 2023 Journal of smart tourism Vol.3 No.3

Given the increasing information overload among users of online review websites, understanding the manner in which cognitive costs are reduced and efficient information is made reliable has become increasingly important. This study targets a unique consumer review design and explores how reviews from an external peer-to-peer site embedded in an online travel agency (OTA) website influence subsequent evaluation behaviors. The empirical results indicate that (1) embedded external reviews with a high average valence tend to strengthen the influence of the positive evaluation ratio while diminishing the effect of the review volume, and (2) embedded external reviews with a large variance strengthen the positive effect of the review volume while weakening the effect of the positive evaluation ratio on subsequent positive evaluations. The findings provide practical insights for consumers and online platforms.

Customized product design information feedback technology based on tentative design chain reconstruction

Lemiao Qiu,Huifang Zhou,Zili Wang,Yiming Zhang,Shuyou Zhang,Longwu Pan 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.12

The design process of customized products involves dynamic feedback on customer requirements, design alterations, design knowledge, and other information. Current technologies for designing customized products focus on implementing product functions, but are short of effective support for design information feedback. The paper introduces a feedback technology of customized product design information based on tentative design chain reconstruction, whereby a tentative design chain and a corresponding design assignment matrix (DAM) are built in accordance with the logical relationship between the design assignments of the customized product. The tentative design chain is reconstructed through matrix decomposition to optimize the implementation path of the design assignments. Based on the reciprocal relationship between information transfer and feedback path for the design of a customized product, the feedback path of the customized product design information is extracted. The implementation method for feedback are put forward so that the design strategy of the customized product can be adjusted promptly with the feedback information between assignments. The feedback technology of the customized product design information based on the tentative design chain reconstruction is verified by application in the design of the elevator traction sheave. The results show that it helps to reduce the degree of the cross correlation between design assignments, and simplifies the design process of the elevator traction wheel.

Study on three-dimensional numerical simulation of shell and tube heat exchanger of the surface ship under marine conditions

Liao Yi,Cai Qi,He Shaopeng,Wang Mingjun,Xiao Hongguang,Gong Zili,Wang Cong,Jia Zhen,Feng Tangtao,Qiu Suizheng 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.4

Shell-and-tube heat exchanger (STHX) is widely used by virtue of its simple structure and high reliability, especially in a space-constrained surface ship. For the STHX of the surface ship, roll, pitch and other motion of the ship will affect the heat transfer performance, resistance characteristics and structural strength of the heat exchanger. Therefore, it is urgent to carry out numerical simulation research on three-dimensional thermal hydraulic characteristics of surface ship STHX under the marine conditions. In this paper, the numerical simulation of marine shell and tube heat exchanger of surface ship was carried out using the porous media model. Firstly, the mathematical physical model and numerical method are validated based on the experimental data of a marine engine cooling water shell and tube heat exchanger. The simulation results are in good agreement with the experimental results. The prediction errors of pressure drop and heat transfer are less than 10% and 1% respectively. The effect of marine conditions on the heat transfer characteristics of the heat exchanger is investigated by introducing the additional force model of marine condition to evaluate the effect of different motion parameters on the heat transfer performance of the heat exchanger. This study could provide a reference for the optimization of marine heat exchanger design.

Innovative Surface Merging Method for Generating Point-Based Skin Model Shapes Considering Processing Features

Ci He,Shuyou Zhang,Lemiao Qiu,Zili Wang,Xiaojian Liu 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.11

Virtual prototypes have been appealing in the early design stage of computer aided tolerancing, because it is less expensive to evaluate and modify tolerances numerically. Derived from the machining processes, form uncertainties are simulated, controlled and analyzed in virtual prototypes using parametric and intuitive surface patches. The generation of a complete virtual prototype often involves combining surface patches with different patterns to one complete model. To overcome possible geometric defects in this process, a surface merging method is proposed in this paper. Skin Model Shapes is first introduced as the geometric foundation. The whole part surface is segmented based on the geometric shape and machining type. Then point-based patches are generated accordingly. Interpolation implicit surfaces based on radial basis function networks are constructed in patch boundaries based on spatial-constrained homogeneous transformation matrices. A feature augmentation process is then introduced to preserve processing features after resampling the blend patch. The proposed method is proved to be efficient in feature retaining as well as surface smoothing, through numerical experiments and analysis on an example mechanical part. The results show that the generated virtual prototype would become 62.5% more smooth while retaining a 91.6% feature similarity after using the proposed method. Moreover, the proposed method could preserve 174% more features at a cost of 9.0% smoothness than using a conventional modified trimmed filtering method.

The inflammation regulation effects of Enterococcus faecium HDRsEf1 on human enterocyte-like HT-29 cells

Zhongyuan Tian,Lu Yang,Penghui Li,Yuncai Xiao,Jian Peng,Xiliang Wang,Zili Li,Mei Liu,Dingren Bi,Deshi Shi 한국통합생물학회 2016 Animal cells and systems Vol.20 No.2

Enterococcus faecium HDRsEf1 strain used as a probiotic to inhibit intestine inflammation and improve animal growth performance has been proved by our research team; however, it remains unclear how HDRsEf1 was recognized by intestine cells and how it activates the downstream pathway which benefit intestine health. In this study, HDRsEf1 was used to stimulate HT-29 cell line to partially uncover the intestine benefit mechanism of HDRsEf1. The results of cell viability assays showed that HDRsEf1 had no toxicity on HT-29 at concentrations up to 1 × 108 CFU/mL, HDRsEf1 could upregulate the TLR1, TLR2, and TLR6 mRNA level, especially TLR2, and significantly downregulate the mRNA level of TLR4, TLR5, TLR7, TLR8, but did not significantly affect the mRNA or protein level of MyD88, which suggests that HDRsEf1 activates the TLR2 pathway in an MyD88-independent pattern. HDRsEf1 could significantly downregulate the mRNA level of pro-inflammatory factors IL-1β, IL-6, IL-8, IL-12p35, IL-17, and TNF-α and did not affect the anti-inflammatory factors IL-10, PPAR-γ, and TSLP; besides HDRsEf1 did not upregulate the degradation of IκB in HT-29 cells. By contrast, enterohemorrhagic E. coli (EHEC) O157:H7 strongly up-regulated the mRNA level of pro-inflammatory factors IL-1β, IL-6, IL-8, IL-23, and TNF-α, downregulated obviously anti-inflammatory factor PPAR-ɣ, and obviously upregulated the degradation of IκB, which suggested that HDRsEf1 may act as an antagonist to regulate intestine inflammation response to intestine pathogen. These findings shed a light on the intestine benefit mechanism of HDRsEf1.