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Constitutive model coupled with damage for carbon manganese steel in low cycle fatigue
Zhiyong Huang,Qingyuan Wang,Danièle Wagner,Claude Bathias 국제구조공학회 2014 Steel and Composite Structures, An International J Vol.17 No.2
Carbon-manganese steel A42 (French standards) is used in steam generator pipes of nuclear center and subject to low cycle fatigue (LCF) loads. In order to obtain the material LCF behavior, the tests are implemented in a hydraulic fatigue machine. The LCF plastic deformation and cyclic stress in macroscope have been influenced by the accumulated low cycle fatigue damage. The constitutive kinematic and isotropic hardening modeling is modified with coupling fatigue damage to describe the fatigue behavior. The improved model seems to be good agreement with the test results.
Efficient Random Saliency Map Detection
Zhiyong Huang,Fazhi He,Xiantao Cai (사)한국CDE학회 2010 한국CAD/CAM학회 국제학술발표 논문집 Vol.2010 No.8
Most image retargeting algorithm rely heavily on valid saliency map detection to proceed. But the inefficiency of high quality saliency map detection severely restricts applications of these image retargeting methods. In this paper, we describe a random algorithm for efficient context-aware saliency map detection. Our method is a multiple level saliency map detection algorithm which integrates multiple level coarse saliency maps into result saliency map and selectively updates unreliable regions of saliency map to refine detection results. With the virtue of randomized search, our method just needs very little extra memory beyond the input image and result, map, and does not need build auxiliary data structures to accelerate saliency map detection. We implemented our algorithm on GPU, the performance of the proposed algorithm was demonstrated on a variety of images and video sequences, and was compared with the state of the art in image processing.
ZhiYong Wu,Zhiheng Huang,Yucheng Ma,Hua Xiong,Paul P. Conway 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.1
Through-silicon vias (TSVs) have been investigated extensively in recent years. However, the physical mechanisms behind some of the common problems associated with TSVs, such as the protrusion of Cu vias, are still unknown. In addition, since the dimensions of TSVs have been shrunk to microscopic levels, the sizes of the microstructural features of TSVs are no longer small compared to the dimensions of the vias. Therefore, the role and importance of the microstructural features of TSVs need to be studied to enable more accurate reliability predictions. This study focused on the effects the microstructural features of TSVs, i.e., the Cu grains and their [111] texture, grain size distribution, and morphology, have on the thermally induced linear elastic behavior of the vias. The results of the study indicate that stress distribution in the model that takes into account the Cu grains, whose Young’s moduli and Poisson’s ratios are set according to their crystallographic orientations, is more heterogeneous than that in a reference model in which the bulk properties of Cu are used. Stresses as high as 250 MPa are observed in the via of the model that takes into consideration the Cu grains, while stresses in the via of the reference model are all lower than 150 MPa. In addition, smaller Cu grains in the vias result in higher stresses; however, the variation in stress owning to changes in the grain size is within 20 MPa. The frequency of the stresses ranging from 80 MPa to 100 MPa was the highest in the stress distribution of the vias, depending on boundary conditions. The stress level in the vias decreases with the decrease in the number of grains with the [111] texture. Finally, the stress level is lower in the model in which the grain structure is generated using a phase field model and is closer to that of the microstructures present in real materials.
Zhiyong Zheng,Jun Peng,Kunyuan Deng,Kai Gao,Heng Li,Bin Chen,Yingze Yang,Zhiwu Huang 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Lithium-ion battery remaining useful life (RUL) is a key parameter on battery management system. Many machine learning methods are applied to RUL predictions, but they generally suffer from two limitations: (i) the extracted features fail to reflect the information hidden in the historical degradation status, and (ii) the accuracy cannot be guaranteed in the evaluation of battery degradation due to the non-linearity. In this paper, a new prediction method is proposed combining the time window (TW) and Gradient Boosting Decision Trees (GBDT). First, the energy (VCE) and the fluctuation index (VFI) of voltage signal are verified and selected as features. Then, a TW based feature extraction method is designed to extract features from the historical discharge process. After that, GBDT is adopted to model the relation of features and RUL. The proposed method is implemented on a recognized battery degradation dataset, and the advantages in accuracy are proven.
Yaoguo Huang,Guangyi Liu,Jun Liu,Xianglin Yang,Zhiyong Zhang 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.67 No.-
In this paper, novel thiadiazole-thione surfactants including 5-heptyl-1,3,4-thiadiazole-2-thione (HpSDT), 5-phenyl-1,3,4-thiadiazole-2-thione (PSDT) and 5-(2-hydroxyphenyl)-1,3,4-thiadiazole-2-thione (HPhSDT) were synthesized and originally introduced as collectors in froth flotation. Micro-flotation tests showed that HpSDT exhibited better flotation response to malachite than PSDT and HPhSDT, as well as excellent flotation selectivity against quartz. The contact angle results inferred that the hydrophobization intensity of these collectors toward malachite was in the order as HpSDT > PSDT > HPhSDT. ζ-potential recommended a chemisorption of HpSDT on malachite surfaces. FTIR deduced that cupric or cuprous atoms might bond with the S and N atoms of HpSDT to form a conjugated ring. XPS further gave an additional evidence that HpSDT-Cu(I) complexes were produced on malachite surfaces via combining surface Cu atoms with HpSDT’s N and S atoms, with reducing surface Cu(II) to Cu(I). The tighter orientation arrangement on malachite and stronger hydrophobicity rendered HpSDT to possess better flotation affinity toward malachite than PSDT and HPhSDT.
Leader-following Cluster Consensus in Multi-agent Systems with Intermittence
Da Huang,Haijun Jiang,Zhiyong Yu,Chengjun Kang,Cheng Hu 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.2
In this paper, the cluster consensus problem of first-order nonlinear multi-agent systems with aperiodic intermittent communication is studied through pinning leader-following approach. The pinning consensus algorithm based on the relative local intermittent information is designed according to the varies linking ways of clustered network structure. New notions of leading intermittence and inter-cluster intermittence which related to the intermittent linking ways of leader-following clustered structure are developed, and several new systems with intermittence are established due to the new notions. Besides, dynamics with inherent delay are also considered to extend our results to a more general framework. The original communication graph without intermittent pattern is supposed to be directed and weakly connected. Some consensus criteria are derived to guarantee that the cluster consensus problem for the systems with intermittent communication can be solved. Finally, numerical simulations are given to illustrate the effectiveness of the theoretical results.
Xiaodan Huang,Caihua Liu,Zhiyong Zhang,V. Vasanthakumar,Huiying Ai,Lei Xu,Ming-Lai Fu,Baoling Yuan 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-
Carbon-based metallic catalysts (CMCs) have emerged as efficient materials for removing water contaminants,but preparing CMCs with high efficiency and stability remains a great challenge. In this study, weprepared a bimetallic composite of Cu-Co/C catalyst via a gelation and calcination method to degradeOrange II by activating peroxymonosulfate (PMS). The characterization results demonstrated that thespecific surface area and pore size of Cu-Co/C catalysts were 1.675 m2/g and 6.313 nm, respectively,which can provide larger catalytic active sites for boosting PMS activation. Moreover, the effects of differentfactors on Orange II degradation efficiency, cyclic experiments, and possible application in realwater bodies were investigated. The Cu-Co/C catalyst can effectively activate PMS, and 50 mg/L ofOrange II was almost completely removed within 15 min. Additionally, the Cu-Co/C catalyst exhibitedhigh degradation efficiency for other organic dye pollutants. The radical quenching experiments indicatedthat the main active species for Cu-Co/C catalyzed degradation of Orange II were SO4and singlet oxygen(1O2). The catalyst demonstrated good stability and performance in real water bodies. We believe thatthis study will promote the application of carbon-based bimetallic catalysts in the environmental remediationprocess that utilize SO4based advanced oxidation.
Xiao, Huapeng,Wang, Jun,Huang, Hongtao,Lu, Linfeng,Lin, Qingfeng,Fan, Zhiyong,Chen, Xiaoyuan,Jeong, Chaehwan,Zhu, Xufei,Li, Dongdong Elsevier 2015 Nano energy Vol.11 No.-
<P><B>Abstract</B></P> <P>Plasmonic thin film solar cells deposited on periodically textured photonic crystal substrates have been extensively studied since the substantially enhanced light absorption. The reduction of parasitic absorption losses in the metal and spacer layers becomes one of the key issues to achieve high efficiency solar cells. Herein, plasmonic amorphous silicon (a-Si:H) flexible thin film solar cells with different thickness of oxide spacer layers are systematically investigated. An increase of the spacer layer thickness leads to an evolution in surface morphology of AZO and final devices. More intriguingly, the increase of spacer layer thickness reduces the absorption in Ag layer while induces more absorption in spacer layer. The highest light absorption in silicon layer is observed as applying 100nm spacer layer, which is further verified by electrical measurements. Our observations demonstrate a versatile and convenient route towards rational design of light harvesting nanostructure for high performance plasmonic solar cells based on a broad range of materials.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Amorphous silicon thin film solar cells are constructed on patterned substrates. </LI> <LI> The devices properties are studied as a function of spacer layer thickness. </LI> <LI> An increase of spacer layer thickness reduces the absorption loss of Ag layer. </LI> <LI> The device with 100nm spacer layer confines more incident light in silicon layer. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>