Enhanced reaction kinetics enabled by a bi-element co-doping strategy for high-performance ternary Si-based anodes of Li-ion batteries

( Wenwu Li ),민동현,박호석 한국공업화학회 2023 한국공업화학회 연구논문 초록집 Vol.2023 No.1

Citrus Genetic Transformation with Interest Target Genes for Cultivar Improvement

Wenwu Guo,Yanxin Duan,Dingli Li,Xin Liu,Bin Tan,Xiaodong Cai,Xiuxin Deng 한국원예학회 2006 한국원예학회 기타간행물 Vol.- No.-

Cloud Computing Environments Parallel Data Mining Policy Research

Wenwu Lian,Xiaoshu Zhu,Jie Zhang,Shangfang Li 보안공학연구지원센터 2015 International Journal of Grid and Distributed Comp Vol.8 No.4

Causal analysis of natural gas station pipelines vibration and reduction measures

Wenwu Yang,Xin Li,Yuhan Tao,Kang Cen,Yunqiao Wen 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.9

The existing studies on the strong vibration problem of the outbound process pipeline of a natural gas transfer station focus on the pipeline process with a compressor. This work proposes a structural innovation to eliminate the pipeline vibration without compressor by experiment and numerical simulation. A simulation model was established based on the physical dimensions. Hammer test and finite element method validated the proposed model for natural gas stations pipelines. It was found that in branch 1 and 2 occur the first two coupled modes. In addition, three kinds of vibration reduction schemes, such as increasing sleeve and increasing pipe diameter, are proposed to increase the pipe rigidity and reduce the excitation force to control the vibration. It is revealed that adding sleeves to the branch pipes 1 and 2 can better suppress pipe vibration by referring to related evaluation standards. This case shows that performing variable-condition vibration testing and spectrum characteristics analysis of pipelines can easily reveal the main vibration sources and provide solutions for pipeline vibration reduction treatment.

An Efficient and Secure Authentication Scheme with Session Key Negotiation for Timely Application of WSNs

Jiping Li,Yuanyuan Zhang,Lixiang Shen,Jing Cao,Wenwu Xie,Yizheng,Shouyin Liu 한국인터넷정보학회 2024 KSII Transactions on Internet and Information Syst Vol.18 No.3

For Internet of Things, it is more preferred to have immediate access to environment information from sensor nodes (SNs) rather than from gateway nodes (GWNs). To fulfill the goal, mutual authentication scheme between user and SNs with session key (SK) negotiation is more suitable. However, this is a challenging task due to the constrained power, computation, communication and storage resources of SNs. Though lots of authentication schemes with SK negotiation have been designed to deal with it, they are still insufficiently secure and/or efficient, and some even have serious vulnerabilities. Therefore, we design an efficient secure authentication scheme with session key negotiation (eSAS2KN) for wireless sensor networks (WSNs) utilizing fuzzy extractor technique, hash function and bitwise exclusive-or lightweight operations. In the eSAS2KN, user and SNs are mutually authenticated with anonymity, and an SK is negotiated for their direct and instant communications subsequently. To prove the security of eSAS2KN, we give detailed informal security analysis, carry out logical verification by applying BAN logic, present formal security proof by employing Real-Or-Random (ROR) model, and implement formal security verification by using AVISPA tool. Finally, computation and communication costs comparison show the eSAS2kN is more efficient and secure for practical application.

Multi-objective optimization design of a centrifugal impeller by positioning splitters using GMDH, NSGA-Ⅲ and entropy weight-TOPSIS

Xing Xie,Zhenlin Li,Baoshan Zhu,Hong Wang,Wenwu Zhang 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.5

A centrifugal impeller with splitters was designed by three-dimensional (3D) inverse design method, and its efficiency, velocity non-uniformity at impeller exit and maximum equivalent stress of blades were optimized by providing the suitable blade stacking angle, work ratio and circumferential location of the splitter. First, 80 samples were generated by optimal Latin hypercube technique and the corresponding impellers were designed by 3D inverse design. Using computational fluid dynamics (CFD) and fluid structure interaction (FSI), the optimization objectives were obtained. Then, the group method of data handling (GMDH) artificial neural networks was established to link the design parameters and objectives by the specific formulas. The reference-point-based non-dominated sorting genetic algorithm (NSGA-Ⅲ) was applied to search the Pareto front. Finally, the preferred impeller was selected by adopting entropy weight and the method of technique for order preference by similarity to an ideal solution (TOPSIS). The results showed that the splitter of the preferred impeller had a circumferential location of 0.58, blade stacking angle of 28° and work ratio of 0.48. The nonuniformity at impeller exit and maximum equivalent stress of blades of preferred impeller obtained by NSGA-Ⅲ were decreased, while the efficiency was improved.

Aging Precipitation Behavior and Its Influence on Mechanical Properties of Mn18Cr18N Austenitic Stainless Steel

Fengming Qin,Yajie Li,Wenwu He,Xiaodong Zhao,Huiqin Chen 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.6

The aging precipitation behavior in Mn18Cr18N austenitic stainless steel was investigated at temperatures from600 °C to 900 °C. During isothermal aging treatment, the primary precipitate was Cr2N with a = 0.478 nm and c =0.444 nm, and it preferentially nucleates along initial grain boundaries and gradually grows towards the interior ofgrains in discontinuous cellular way. Meanwhile, a small amount of granular face-centred cubic M23C6 with a =1.066 nm also were observed, which mainly form along grain boundaries. The effect of these precipitates onmechanical properties of the alloy was studied. It was found that precipitates result in degeneration of the matrixhardness. Meanwhile, the SEM morphologies of aged tensile sample show that the brittle fracture predominatesduring deformation, i.e. the fracture mode transforms from intergranular fracture to transgranular fracture with theincreasing of aging time. Compared with the solution-treated sample, the strength of the aged tensile samplesslightly decreases and plasticity remarkably deteriorates.

Parameter Sensitivity Study on Static and Dynamic Mechanical Properties of the Spatial Y-shaped Tied Arch Bridge

Jianpeng Sun,Zihan Tan,Jiaju Zhang,Wenwu Sun,Li Zhu 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.2

The spatial Y-shaped tied arch bridge is a rare form of innovative bridge on arch bridges around the world. It has important reference significance for the design and construction of bridge engineering worldwide. This arch bridge is novel in design and adopts single and double arch ribs combined structure. However, as a novel bridge type, its force situation is indetermination, so it is very important to study its mechanical properties and parameter sensitivity. In order to study the mechanical properties of the spatial Y-shaped tied arch bridge and the influence of structural parameters, this paper takes a spatial Y-shaped tied arch bridge under construction in China as the research object. The finite element software MIDAS Civil is used to establish the bridge model. The finite element model is used to analyze the static and dynamic performance of the spatial Y-shaped tied arch bridge under the use stage and the mechanical change trend under the influence of different rise-span ratios and double arch bifurcation angles. The results of single arch rib and double arch rib under constant load and live load are compared under different structural parameters in this paper, and the parameter sensitivity analysis of statics and dynamics is carried out. These analyses provide the adjustment basis and design reference for the design of the special-shaped arch bridge in the future.

Effects of quercetin and coated sodium butyrate dietary supplementation in diquat-challenged pullets

Zhou Ning,Tian Yong,Liu Wenchao,Tu Bingjiang,Gu Tiantian,Xu Wenwu,Zou Kang,Lu Li Zhi 아세아·태평양축산학회 2022 Animal Bioscience Vol.35 No.9

Objective: This study was designed to investigate the hypothesis that dietary quercetin (QUE) and coated sodium butyrate (SB) supplementation alleviate oxidative stress in the small intestine of diquat (DIQ)-challenged pullets. Methods: A total of 200 13-week-old pullets were divided into four groups: the control group (CON), the DIQ group, the QUE group, and the coated SB group, and injected intraperitoneally with either saline (CON) or diquat (DIQ, QUE, and SB) to induce oxidative stress on day 0. Results: On the first day, the malondialdehyde and superoxide dismutase (SOD) concentrations in the SB group were significantly different from those in the DIQ and QUE groups (p<0.05), and dietary supplementation with SB increased serum glutathione peroxidase (GSH-PX) levels compared with the DIQ group (p<0.05). Quercetin and SB increased the levels of CLAUDIN-1 and zonula occludens-1 (ZO-1) in the jejunum. On the tenth day of treatment, QUE attenuated the decrease in GSH-PX levels compared to those of the CON group (p<0.05), while SB increased SOD, GSH-PX, and total antioxidant capacity levels compared to those of the DIQ group. Nuclear factor erythroid 2-related factor 2 (NRF2) and heme oxygenase-1 (HO-1) mRNA levels in the QUE and SB groups increased (p<0.05) and CLAUDIN-1 mRNA levels in the QUE and SB groups were upregulated compared to those in the DIQ group ileum tissue. Conclusion: Supplementation of QUE and SB demonstrated the ability to relieve oxidative stress in pullets post DIQ-injection with a time-dependent manner and QUE and SB may be potential antioxidant additives for relieving oxidative stress and protecting the intestinal barrier of pullets. Objective: This study was designed to investigate the hypothesis that dietary quercetin (QUE) and coated sodium butyrate (SB) supplementation alleviate oxidative stress in the small intestine of diquat (DIQ)-challenged pullets.Methods: A total of 200 13-week-old pullets were divided into four groups: the control group (CON), the DIQ group, the QUE group, and the coated SB group, and injected intraperitoneally with either saline (CON) or diquat (DIQ, QUE, and SB) to induce oxidative stress on day 0.Results: On the first day, the malondialdehyde and superoxide dismutase (SOD) concentrations in the SB group were significantly different from those in the DIQ and QUE groups (p<0.05), and dietary supplementation with SB increased serum glutathione peroxidase (GSH-PX) levels compared with the DIQ group (p<0.05). Quercetin and SB increased the levels of CLAUDIN-1 and zonula occludens-1 (ZO-1) in the jejunum. On the tenth day of treatment, QUE attenuated the decrease in GSH-PX levels compared to those of the CON group (p<0.05), while SB increased SOD, GSH-PX, and total antioxidant capacity levels compared to those of the DIQ group. Nuclear factor erythroid 2-related factor 2 (NRF2) and heme oxygenase-1 (HO-1) mRNA levels in the QUE and SB groups increased (p<0.05) and CLAUDIN-1 mRNA levels in the QUE and SB groups were upregulated compared to those in the DIQ group ileum tissue.Conclusion: Supplementation of QUE and SB demonstrated the ability to relieve oxidative stress in pullets post DIQ-injection with a time-dependent manner and QUE and SB may be potential antioxidant additives for relieving oxidative stress and protecting the intestinal barrier of pullets.

Comparative analysis of liver transcriptome reveals adaptive responses to hypoxia environmental condition in Tibetan chicken

Yongqing Cao,Tao Zeng,Wei Han,Xueying Ma,Tiantian Gu,Li Chen,Yong Tian,Wenwu Xu,Jianmei Yin,Guohui Li,Lizhi Lu,Shuangbao Gun Asian Australasian Association of Animal Productio 2024 Animal Bioscience Vol.37 No.1

Objective: Tibetan chickens, which have unique adaptations to extreme high-altitude environments, exhibit phenotypic and physiological characteristics that are distinct from those of lowland chickens. However, the mechanisms underlying hypoxic adaptation in the liver of chickens remain unknown. Methods: RNA-sequencing (RNA-Seq) technology was used to assess the differentially expressed genes (DEGs) involved in hypoxia adaptation in highland chickens (native Tibetan chicken [HT]) and lowland chickens (Langshan chicken [LS], Beijing You chicken [BJ], Qingyuan Partridge chicken [QY], and Chahua chicken [CH]). Results: A total of 352 co-DEGs were specifically screened between HT and four native lowland chicken breeds. Gene ontology and Kyoto encyclopedia of genes and genomes enrichment analyses indicated that these co-DEGs were widely involved in lipid metabolism processes, such as the peroxisome proliferator-activated receptors (PPAR) signaling pathway, fatty acid degradation, fatty acid metabolism and fatty acid biosynthesis. To further determine the relationship from the 352 co-DEGs, protein-protein interaction network was carried out and identified eight genes (ACSL1, CPT1A, ACOX1, PPARC1A, SCD, ACSBG2, ACACA, and FASN) as the potential regulating genes that are responsible for the altitude difference between the HT and other four lowland chicken breeds. Conclusion: This study provides novel insights into the molecular mechanisms regulating hypoxia adaptation via lipid metabolism in Tibetan chickens and other highland animals.