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Mechanical Response of Barricade to Coupled THMC Behavior of Cemented Paste Backfill
Di Wu,Wentao Hou,Shuai Liu,Huaibin Liu 한국콘크리트학회 2020 International Journal of Concrete Structures and M Vol.14 No.5
Cemented paste backfill (CPB), which is prepared by mixing tailings, binder and water, is widely used in underground mines for waste management and ground control. Since the CPB is delivered into mined-out areas in the form of fluid, a barricade needs to be constructed for retaining it during the process of its filling and hardening. Therefore, the barricade should have enough mechanical stability to ensure the safety of the backfill operation. The behavior of CPB, which is influenced by the thermal, hydraulic, mechanical and chemical (THMC) coupled processes, acts on the barricade and thus affects its mechanical response. In the present study, a numerical model is developed to predict and analyze the barricade mechanical performance in response to the coupled THMC behavior of CPB. The validity of the proposed model is then verified against two field case studies. Acceptable agreement between the model prediction results and in situ monitoring data proves the capability of the developed model in simulating the barricade pressure and displacement. Then, the validated model is used to investigate the effect of filling strategy on the barricade displacement. The obtained results can contribute to a better understanding of the barricade performance under various backfill conditions.
Gong-Yu Hou,Zi-Xiang Li,Kai-Di Wang,Jin-Xin Hu 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.11
Structural deformation monitoring is vital to the safety of concrete structures. However, the distributed deformation of structures cannot be easily obtained using existing monitoring methods in civil engineering. To this end, this paper proposes a method to estimate the continuous deformation of concrete beams by utilizing the distributed optical fiber monitoring technology. In this method, optical fibers and a total station are used to obtain the strain and deformation distribution curves of a concrete beam, respectively. Subsequently, these curves are inputted to a back propagation network as training samples to learn their relationships. The results show that the deformation value of trained neural network is very close to that of the total station, with a maximum error of only 2.7% (0.3 mm). The linear regression analysis shows a goodness of fit R2 greater than 0.98, which confirms the reliability of the simulations results.
Li-Jun Tang,Di Wu,Shuhua Hou,Xin Wen,Xin Dai 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.8
A carbazole-based Schiff base CB2 was synthesized and applied as a highly selective and sensitive fluorescent probe for Cu2+ in H2O-DMSO (8/2, v/v, pH = 7.4) solution. CB2 exhibits an excellent selectivity to Cu2+ over other examined metal ions with a prominent fluorescence “turn-on” at 475 nm. CB2 and Cu2+ forms a 1:2 binding ratio complex with detection limit of 9.5 μM. In addition, the Cu2+ recognition process is hardly interfered by other examined metal ions.
An Itelligent System for Diagnosis of Coronary Artery Disease with BP Neural Networks
Yanping Ba,Liya Hou,Shuicai Wu,Di Zhang 대한의료정보학회 2007 Healthcare Informatics Research Vol.13 No.2
Objective: In this paper, an intelligent system using BP neural networks (BPNN) is presented for early detection coronary artery disease (CAD). Methods: Based on the four features of ECG signals and six basic parameters of patients, BPNN was built and trained. Especially the method which combined feature extraction and classification was discussed. Results: The performance of the intelligent system has been evaluated in 20 samples. The test results showed that this system was effective in detecting CAD. The correct classification rate was about 90% for normal subjects and 100% for abnormal subjects. Conclusion: BPNN could quite accurately detect abnormal subjects. Because it is not expensive and noninvasive, it is fit to examine health of the elderly and has good application foreground. (Journal of Korean Society of Medical Informatics 13-2, 147-151, 2007)
Prediction of rolling bearing performance degradation based on sae and TCNattention models
Yaping Wang,Dekang Hou,Di Xu,Sheng Zhang,Chaonan Yang 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.4
A single feature cannot show the operational state of a bearing during its entire life cycle. Therefore, a rolling bearing performance deterioration prediction method based on an SAE and the TCN-attention model is proposed. The SAE method is used to fuse the timedomain indicator and the frequency-domain indicator to construct the performance degradation characteristic indicator. The evaluation indices are used to comprehensively evaluate multiple performance degradation indices, and the fused feature indices together, to filter out the features that have a good overall performance. Attention is added to the TCN model, and the output state weight of the TCN model is calculated through a scoring function to increase the important information weight and the prediction accuracy. The appropriate network structure and parameter configuration are determined, and the rolling bearing performance degradation prediction model is established. A validation is performed using publicly available datasets from the University of Cincinnati and XJTU-SY. The results show that the method is more sensitive to the critical information part of the long time series than the other models. At the same time, the average absolute error and the root mean square error are minimized, the accuracy of the rolling bearing performance degradation prediction is high, and the model has a strong robustness and generalization abilities. Additionally, the model has practical engineering value for predicting the health status of equipment.
Tang, Lijun,Wu, Di,Hou, Shuhua,Wen, Xin,Dai, Xin Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.8
A carbazole-based Schiff base CB2 was synthesized and applied as a highly selective and sensitive fluorescent probe for $Cu^{2+}$ in $H_2O$-DMSO (8/2, v/v, pH = 7.4) solution. CB2 exhibits an excellent selectivity to $Cu^{2+}$ over other examined metal ions with a prominent fluorescence "turn-on" at 475 nm. CB2 and $Cu^{2+}$ forms a 1:2 binding ratio complex with detection limit of $9.5{\mu}M$. In addition, the $Cu^{2+}$ recognition process is hardly interfered by other examined metal ions.
Yong-Qiang Zhao,Guo-Di Liu,Cong-Cong Hou,Ying-Li Han,Jun-Quan Zhu,Jun-Quan Zhu 대한독성 유전단백체 학회 2016 Molecular & cellular toxicology Vol.12 No.3
Catalase (CAT) is an essential antioxidant in organisms, its can eliminate hydrogen peroxides produced in the cellular environment. Previous studies have focused mainly on the functions of CAT by pathogen challenge, but the functions of CAT by metals stress remain unclear. In order to investigate the function of CAT in Acrossocheilus fasciatus (AfCat), we cloned CAT complete cDNA sequences and analyzed its functions by cadmium (Cd) stress. qPCR analysis illustrated that the expression of CAT changed rapidly and dynamically in response to Cd from 0.05 mg L-1 to 1.25 mg L-1. Enzyme activity assay result showed that CAT activity was up-regulated significantly in response to Cd from 0.05 mg L-1 to 1.25 mg L-1. Histochemistry analysis showed that the structure of liver, testis and kidney were severely damaged by exposed to Cd of 1.25 mg L-1. Collectively, the results of our study indicate that AfCat may play an indispensable role in maintaining redox balance under Cd exposure, but AfCat expression will be inhibited when Cd accumulation reaches to the critical concentration. This study will illuminate the potential functions of AfCat in the defense mechanisms of reproductive and metabolic systems under Cd exposure in A. fasciatus.
Liu, Fei,Pu, Xiao-Yun,Huang, Shao-Guang,Xiang, Gui-Ming,Jiang, Dong-Neng,Hou, Gou,Huang, Di-Nan Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.11
To investigate the expression of hPOT1 in the HeLa cell line and screen point mutations of hpot1 in different tumor tissues a two step osmotic method was used to extract nuclear proteins. EMSA was performed to determine the expression of hPOT1 in the HeLa cell line. PCR was also employed to amplify the exon14 sequence of the hpot1 gene in various of cancer tissues. A SV gel and PCR clean-up system was performed to enrich PCR products. DNAStar was used to analyse the exon14 sequence of the hpot1 gene. hPOT1 was expressed in the HeLa cell line and the signal was gradually enhanced as the amount of extracted nuclear proteins increased. The DNA fragment of exon14 of hpot1 was successfully amplified in the HeLa cell line and all cancer tissues, point mutations being observed in 2 out of 3 cases of endometrial cancer (66.7%) despite the hpot1 sequence being highly conserved. However, the sequence of hpot1 exon14 do not demonstrate point mutations in most cancer tissues. Since hPOT1 was expressed in HeLa cell and the probability of gene point variants was obviously higher in endometrial cancer than other cancers, it may be involved in the pathogenesis of gynecological cancers, especially in cervix and endometrium.
Synthesis of N-Azaaryl Anilines: An Efficient Protocol via Smiles Rearrangement
Shuai Xia,Li-Ying Wang,Heng-Zhi Sun,Huan Yue,Xiu-Hua Wang,Jia-Lian Tan,Yin Wang,Di Hou,Xiao-Yan He,Ki-Cheol Mun,B. Prem kumar,Hua Zuo,신동수 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.2
An efficient process for the synthesis of N-azaaryl anilines via Smiles rearrangement as a tool. A variety of Nazaaryl anilines were generated by the reaction of substituted phenols, substituted anilines, aminopyridines and chloroacetyl chloride or pyridols, under base condition in good to excellent yields.
Synthesis of N-Azaaryl Anilines: An Efficient Protocol via Smiles Rearrangement
Xia, Shuai,Wang, Li-Ying,Sun, Heng-Zhi,Yue, Huan,Wang, Xiu-Hua,Tan, Jia-Lian,Wang, Yin,Hou, Di,He, Xiao-Yan,Mun, Ki-Cheol,Kumar, B. Prem,Zuo, Hua,Shin, Dong-Soo Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.2
An efficient process for the synthesis of N-azaaryl anilines via Smiles rearrangement as a tool. A variety of N-azaaryl anilines were generated by the reaction of substituted phenols, substituted anilines, aminopyridines and chloroacetyl chloride or pyridols, under base condition in good to excellent yields.