A Simplified Numerical Model for Post-tensioned Steel Connections with Bolted Angles

Zhi-Hua Chen,Hongxing Li,Zhongwei Zhao,Haiqing Liu 한국강구조학회 2017 International Journal of Steel Structures Vol.17 No.4

Post-tensioned (PT) self-centering beam–column connections has been developed for its good seismic performance. Many researchers have investigated its mechanical behavior by numerical or experimental method. Prior researches have indicated that the analysis by elaborate FE models is very time consuming. To overcome this disadvantage, a simplified numerical model was established in this paper. The accuracy of results derived by this model was validated against prior investigations on interior PT connections with top-and-seat angles. Influence of initial PT force on mechanical behavior of PT connection was investigated. The Geometric and material nonlinearities, and strands can be considered in the modeling. A planar steel frame structure was established and hysteretic analysis was conducted. Results indicated that the computational cost can be greatly reduced by this model.

An Efficient Multi-PCA Based On-line Monitoring Scheme for Multi-Stages Imperial Smelting Process

Zhi-kun Hu,Zhi-wen Chen,Wei-Hua Gui,Chun-hua Yang,Lin-zi Yin,Xiao-qi Peng 제어·로봇·시스템학회 2013 International Journal of Control, Automation, and Vol.11 No.2

Imperial Smelting Process (ISP) is one of the main methods for Zinc and Lead smelting. In this paper, we firstly focus on its unique characteristics that ISP consists of many feeding cycles repeated in a similar way, and the normal process changes and multiple operating conditions would be frequently found in the process which would always lead to false alarms. To this end, we classify each feeding cycles of ISP into initial stage, transition stage, and steady stage, and use standard PCA, first order perturbation (FOP) based recursive dynamic PCA and multi-mode approach to deal with them respectively. The monitoring results using real data show that the proposed scheme can be able to eliminate false alarms and detect faults efficiently.

Colorimetric Probe Coupled to Dispersive Liquid–Liquid Microextraction for Determination of Dopamine in Serum

Zhi-gang Tai,Yi-ren Zhu,Yi-bo Yuan,Jin Liu,Zhen-jie Li,Zhi-hua Liu,Kun-miao Wang 대한화학회 2020 Bulletin of the Korean Chemical Society Vol.41 No.3

In this work, a highly sensitive method using a colorimetric probe coupled to dispersive liquid?liquid microextraction (DLLME) was developed for the quantitative determination of dopamine (DA) in serum. The DA in serum was concentrated by DLLME to increase the detection sensitivity and reduce the matrix effects. After the DLLME process, a colorimetric probe of silver triangular nanoparticles (AgTNPs) was used to detect DA, which was based on the plasma transformation of AgTNPs caused by strong interactions with melamine (MA). The results showed that DA could inhibit the aggregation of AgTNPs induced by MA, resulting in the recovery of the surface plasmon resonance (SPR) peak of AgTNPs. Thus, the DLLME method followed by colorimetric probe detection of DA can be achieved. The parameters affecting the proposed method were optimized, under the optimal conditions, a linear calibration curve was obtained over a concentration range of 5 to 250?nM with a recovery from 94.4 to 101.3%. The detection limit was 1.6 nM (at an S/N ratio of 3). The present method was successfully applied to determine DA in human serum.

Bayesian forecasting approach for structure response prediction and load effect separation of a revolving auditorium

Zhi Ma,Chung-Bang Yun,Yan-Bin Shen,Feng Yu,Hua-Ping Wan,Yao-Zhi Luo 국제구조공학회 2019 Smart Structures and Systems, An International Jou Vol.24 No.4

A Bayesian dynamic linear model (BDLM) is presented for a data-driven analysis for response prediction and load effect separation of a revolving auditorium structure, where the main loads are self-weight and dead loads, temperature load, and audience load. Analyses are carried out based on the long-term monitoring data for static strains on several key members of the structure. Three improvements are introduced to the ordinary regression BDLM, which are a classificatory regression term to address the temporary audience load effect, improved inference for the variance of observation noise to be updated continuously, and component discount factors for effective load effect separation. The effects of those improvements are evaluated regarding the root mean square errors, standard deviations, and 95% confidence intervals of the predictions. Bayes factors are used for evaluating the probability distributions of the predictions, which are essential to structural condition assessments, such as outlier identification and reliability analysis. The performance of the present BDLM has been successfully verified based on the simulated data and the real data obtained from the structural health monitoring system installed on the revolving structure.

Fault Classification Method for Inverter Based on Hybrid Support Vector Machines and Wavelet Analysis

Zhi-kun Hu,Wei-hua Gui,Chun-hua Yang,Peng-cheng Deng,Steven X. Ding 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.4

A new classification method for fault waveform is proposed based on discrete orthogonal wavelet transform (DOWT) and hybrid support vector machine (hybrid SVM) for fault type of a three-phase voltage inverter. The waveforms of output voltage obtained from the faulty inverter are decomposed by DOWT into wavelet coefficient matrices, through which we can obtain singular value vectors acted as features of time-series periodic waveforms. And then a multi-classes classification method based on a new Huffman Tree structure is presented to realize 1-v-r SVM strategy. The extracted features are applied to hybrid SVM for determining fault type. Compared to employing the structure based on ordinary binary tree, the superiority of the proposed SVM method is shown in the success of fault diagnosis because the average Loo-correctness of the SVM based on Huffman tree structure exceed the general SVM 3.65%, and the correctness reaches 99.6%.

Genetic Linkage of Genes for a Thermo-sensitive Genic Male Sterility in Maize: The genetic analysis of an TGMS Line Qiong-6ms in maize

Zhi Yuan Fu,Hui Ling Xie,Jian Sheng Li,Yan Min Hu,Zong Hua Liu,Zhong You He,Ji Hua Tang 한국유전학회 2008 Genes & Genomics Vol.30 No.6

Thermo-sensitive genic male sterile (TGMS) lines can provide new options for hybrid seed production using "two-line" system. A set of F2 and BC1 populations derived from the cross between Qiong-6ms and Dan958 were employed to analyze the inheritance of a TGMS line Qiong-6ms and map the TGMS genes in maize. The results demonstrated that the sterility of Qiong-6ms was governed by two duplicative recessive genes, named tms1 and tms2. The gene tms1 was mapped to chromosome 5 linked with the SSR markers umc1355, umc2302 and umc1784 at a distance of 3.0 cM, 1.3 cM and 0.9 cM respectively; while tms2 was localized on chromosome 3, linked with SSR markers bnlg1605 (0.5 cM) and umc2050 (4.2 cM). These markers, which are tightly linked with the tms1 and tms2 genes, will be helpful for marker assisted selection of TGMS lines in maize.

The horizontal stability of an FLNG with different turret locations

Zhi-Tian Xie,Jian-Min Yang,Zhi-Qiang Hu,Wen-Hua Zhao,Jing-Rui Zhao 대한조선학회 2015 International Journal of Naval Architecture and Oc Vol.7 No.2

The horizontal stability of a Single-Point Moored (SPM) Floating Liquefied Natural Gas (FLNG) facility is investigated. Both numerical and experimental studies have been conducted for this SPM FLNG. The numerical simulations feature well the experimental data. The effects of the turret locations are studied based on the validated numerical model. Statistic results of the vessel’s motions with different turret locations are conducted and compared. The results show that the longitudinal location of the turret has a significant influence on the horizontal stability, which has a strong relationship with the yaw and roll motions. The calculated top tensions on the hawsers also develop a regular change as changing the turret’s location. The investigation will provide a brief of principles with more details for the design of the ongoing project.

β3GnT8 Regulates Laryngeal Carcinoma Cell Proliferation Via Targeting MMPs/TIMPs and TGF-β1

Hua, Dong,Qin, Fang,Shen, Li,Jiang, Zhi,Zou, Shi-Tao,Xu, Lan,Cheng, Zhi-Hong,Wu, Shi-Liang Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.5

Previous evidence showed ${\beta}1$, 3-N-acetylglucosaminyltransferase 8 (${\beta}3GnT8$), which can extend polylactosamine on N-glycans, to be highly expressed in some cancer cell lines and tissues, indicating roles in tumorigenesis. However, so far, the function of ${\beta}3GnT8$ in laryngeal carcinoma has not been characterized. To test any contribution, Hep-2 cells were stably transfected with sense or interference vectors to establish cell lines that overexpressed or were deficient in ${\beta}3GnT8$. Here we showed that cell proliferation was increased in ${\beta}3GnT8$ overexpressed cells but decreased in ${\beta}3GnT8$ knockdown cells using MTT. Furthermore, we demonstrated that change in ${\beta}3GnT8$ expression had significant effects on tumor growth in nude mice.We further provided data suggesting that overexpression of ${\beta}3GnT8$ enhanced the expression of matrix metalloproteinase-2 (MMP-2) and matrix metalloproteinase-9 (MMP-9) at both the mRNA and protein levels, associated with shedding of tissue inhibitors of metalloproteinase TIMP-2. In addition, it caused increased production of transforming growth factor beta 1 (TGF-${\beta}1$), whereas ${\beta}3GnT8$ gene knockdown caused the reverse effect. The results may indicate a novel mechanism by which effects of ${\beta}3GnT8$ in regulating cellular proliferation are mediated, at least in partvia targeting MMPs/TIMPs and TGF-${\beta}1$ in laryngeal carcinoma Hep-2 cells. The finding may lay a foundation for further investigations into the ${\beta}3GnT8$ as a potential target for therapy of laryngeal carcinoma.

Unusual Features in an Adult Pancreatic Hemangioma: CT and MRI Demonstration

Zhi-hua Lu,Mei Wu 대한영상의학회 2013 Korean Journal of Radiology Vol.14 No.5

Hemangiomas in the pancreas are very rare and only a few cases in adulthood have been reported in the literature. We describe a case of pancreatic hemangiomas in an adult with unique imaging findings. A 23-year-old woman visited the hospital for an incidentally detected pancreatic mass. CT and MRI revealed a multilocular cyst with fluid-fluid levels and no obvious enhancement. The patient underwent surgery and the mass was confirmed as a pancreatic hemangioma. The radiological features and differential diagnosis of this rare lesion are discussed.

Analytical and Design Method for the Global Stability of Modular Steel Buildings

Zhi-Hua Chen,Xu Zhong,Yang Liu,Jiadi Liu 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.5

Modular steel buildings (MSBs) are an innovative form of prefabricated buildings with many advantages related to the factory-manufactured construction process. However, technical issues in the global stability design remain ambiguous and induce either unsuitable or uneconomical results without understanding the eff ect of intermodule connections appropriately. In this study, one practical theoretical equation to determine the buckling length factor for the sway-permitted MSB was derived from a sub-assembly considering pinned or rigid inter-module connections. A large number of fi nite element models were then used to numerically validate the eff ectiveness of the theoretical equation and explore the main infl uencing factors including both intermodule connections and height-to-width ratios. Results indicated that the intermodule connections should be carefully considered when the fl oor beams are obviously larger than ceiling beams, and theoretical results can be accurate enough when the height-to-width ratios remain within 3.0. Moreover, the second-order analysis method for MSB was also performed by using nonlinear buckling analyses and then compared with the buckling length method to verify the previous fi ndings. Finally, the criterion in selecting the proper stability design procedure for MSB was discussed in depth.