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Compaction techniques and construction parameters of loess as filling material
Hu, Chang-Ming,Wang, Xue-Yan,Mei, Yuan,Yuan, Yi-Li,Zhang, Shan-Shan Techno-Press 2018 Geomechanics & engineering Vol.15 No.6
Loess often causes problems when used as a filling material in the construction of foundations. Therefore, the compaction technique, shear behavior, and bearing capacity of a filled foundation should be carefully considered. A series of tests was performed in this study to obtain effective compaction techniques and construction parameters. The results indicated that loess is strongly sensitive to water. Thus, the soil moisture content should be kept within 12%-14% when it is used as a filling material. The vibrating-dynamic combination compaction technique is effective and has fewer limitations than other methods. In addition, the shear strength of the compacted loess was found to increase linearly with the degree of compaction, and the soil's compressibility decreased rapidly with an increase in the degree of compaction when the degree of compaction was less than 95%. Finally, the characteristic value of the bearing capacity increased with an increase in the degree of compaction in a ladder-type way when the degree of compaction was within 92%-95%. Based on the test data, this paper could be used as a reference in the selection of construction designs in similar engineering projects.
Research on bearing characteristics of socket-spigot template supporting system
Chang-Ming Hu,Yan Guo,Ming Lian 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.20 No.4
The socket-spigot template supporting system is widely used in engineering applications in China. As a newer type of support structure, there has been growing research interest in its bearing capacity. In this paper, four vertical bearing capacity tests were carried out on the basic mechanical unit frame of a socket-spigot template supporting system. The first goal was to explore the influence of the node semi-rigid degree and the longitudinal spacing of the upright tube on the vertical bearing capacity. The second objective was to analyze the displacement trend and the failure mode during the loading process. This paper presents numerical analysis of the vertical bearing capacity of the unit frames using the finite element software ANSYS. It revealed the relationship between the node semi-rigid degree and the vertical bearing capacity, that the two-linear reinforcement model of elastic-plastic material can be used to analyze the socket-spigot template supporting system, and, through node entity model analysis, that the load transfer direction greatly influences the node bearing area. Finally, this paper indicates the results of on-site application performance experiments, shows that the supporting system has adequate bearing capacity and stability, and comments on the common work performance of a socket and fastener scaffold.
A Novel Active Image AuthenticationSchemefor Block Truncation Coding
Chang-Ming Wu,Yu-Chen Hu,Kuo-Yu Liu,Jun-Chou Chuang 보안공학연구지원센터 2014 International Journal of Signal Processing, Image Vol.7 No.5
In this paper, a simple active image authentication scheme for the compressed images of block truncation coding (BTC) is proposed. In this scheme, the authentication codes of the compressed blocks are generated from the random value induced by the random seed. The authentication code of each compressed block is embedded into the bit map. The bit length of each authentication code can be chosen according to the user’s requirement. The experimental results indicate that the proposed scheme detects the tampered areas clearly and keeps good image qualities of the embedded images. Meanwhile, a low computational cost is required in the proposed scheme.
Shiwei Hu,Ying-Ying Tian,Yao-Guang Chang,Zhao-Jie Li,Chang-Hu Xue,Yu-Ming Wang 한국식품영양과학회 2014 Journal of medicinal food Vol.17 No.7
This study investigated the effects of fucosylated chondroitin sulfate (CHS) isolated from sea cucumber on glucose metabolism and insulin signaling in the liver of insulin-resistant C57BL/6 mice fed a high-fat, high-sucrose diet (HFSD). Male C57BL/6J mice were randomly assigned into six groups: control; HFSD; 1mg RSG/kg$body weight (RSG); 80 mg CHS/kg$body weight (CHS); 20 mg CHS + 1mg RSG/kg$body weight (20 CHS + RSG); and 80 mg CHS + 1mg RSG/kg$body weight (80 CHS + RSG). Blood glucose, insulin parameters, glucose metabolism-related enzymes activities and insulin-signaling transducers in the liver were analyzed at 19 weeks. Results showed that CHS significantly decreased body weight gain, adipose tissue weight, and fasting blood glucose and serum insulin levels in insulin-resistant mice. Rosiglitazone (RSG) is an effective thiazolidinedione hypoglycemic agent, and CHS synergistically enhanced the effect of RSG. CHS feeding normalized the activities of hexokinase, pyruvate kinase, glycogen phosphorylase, glucose-6-phosphatase, and increased glycogen reserves in the liver. Quantitative real-time polymerase chain reaction (qRT-PCR) analysis showed that CHS promoted the mRNA expression of insulin receptors (IR), insulin receptor substrate 2 (IRS-2), phosphatidylinositol 3 kinase (PI3K), protein kinase B (PKB), and glycogen synthase (GS) in the liver of insulin resistant mice, and inhibited glycogen synthase kinase-3 (GSK-3b) mRNA expression. The results suggested that CHS treatment improved glucose metabolism by modulating metabolic enzymes and promoting the PI3K/PKB/GSK-3b signaling pathway mediated by insulin at the transcriptional level. These results provided strong justification for the development of CHS as a functional food.
Hu, Ming-Dong,Xu, Jian-Cheng,Fan, Ye,Xie, Qi-Chao,Li, Qi,Zhou, Chang-Xi,Mao, Mei,Yang, Yu Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.5
The presence of lung cancer cells in anoxic zones is a key cause od chemotherapeutic resistance. Thus, it is necessary to enhance the sensitivity of such lung cancer cells. However, loss of efficient gene therapeutic targeting and inefficient objective gene expression in the anoxic zone in lung cancer are dilemmas. In the present study, a eukaryotic expression plasmid pUC57-HRE-JAB1 driven by a hypoxia response elements promoter was constructed and introduced into lung cancer cell line A549. The cells were then exposed to a chemotherapeutic drug cis-diamminedichloroplatinum (C-DDP). qRT-PCR and western blotting were used to determine the mRNA and protein level and flow cytometry to examine the cell cycle and apoptosis of A549 transfected pUC57-HRE-JAB1. The results showed that JAB1 gene in the A549 was overexpressed after the transfection, cell proliferation being arrested in G1 phase and the apoptosis ratio significantly increased. Importantly, introduction of pUC57-HRE-JAB1 significantly increased the chemotherapeutic sensitivity of A549 in an anoxic environment. In conclusion, JAB1 overexpression might provide a novel strategy to overcome chemotherapeutic resistance in lung cancer.
Hu, Chin-Ping,Chou, Yi,Wu, Ming-Chya,Yang, Ting-Chang,Su, Yi-Hao 한국우주과학회 2013 Journal of Astronomy and Space Sciences Vol.30 No.2
We present the Hilbert-Huang transform (HHT) analysis on the quasi-periodic modulation of SMC X-1. SMC X-1, consistingof a neutron star and a massive companion, exhibits superorbital modulation with a period varying between ~40 d and ~65 d.We applied the HHT on the light curve observed by the All-Sky Monitor onboard Rossi X-ray Timing Explorer (RXTE) to obtainthe instantaneous frequency of the superorbital modulation of SMC X-1. The resultant Hilbert spectrum is consistent with thedynamic power spectrum while it shows more detailed information in both the time and frequency domains. According to theinstantaneous frequency, we found a correlation between the superorbital period and the modulation amplitude. Combiningthe spectral observation made by the Proportional Counter Array onboard RXTE and the superorbital phase derived in theHHT, we performed a superorbital phase-resolved spectral analysis of SMC X-1. An analysis of the spectral parameters versusthe orbital phase for different superorbital states revealed that the diversity of nH has an orbital dependence. Furthermore,we obtained the variation in the eclipse profiles by folding the All Sky Monitor light curve with orbital period for differentsuperorbital states. A dip feature, similar to the pre-eclipse dip of Her X-1, can be observed only in the superorbital ascendingand descending states, while the width is anti-correlated with the X-ray flux.
Transverse vibration of flexible hoisting rope with time-varying length
Ji-hu Bao,Peng Zhang,Chang-Ming Zhu,Wei Sun 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.2
The nonlinear vibration of a flexible hoisting rope with time-varying length is investigated. The governing equations of the flexible hoistingrope are developed based on Hamilton’s principle. Experiments performed evaluated the theoretical model and found that the experimentaldata agree well with the theoretical prediction, which validates the mathematical model of the flexible hoisting system. The resultsof the simulations and experiments show that the flexible hoisting system dissipates energy during downward movement (thus is stabilized)and gains energy during upward movement (thus is unstabilized). In addition, a passage through resonance in the hoisting system withperiodic external excitation is analyzed. Due to the time-varying length of the hoisting rope the natural frequencies of the system varyslowly, and transient resonance may occur when one of the frequencies coincides with the frequency of an external excitation.
Song, Ming-Xia,Deng, Xian-Qing,Wei, Zhi-Yu,Zheng, Chang-Ji,Wu, Yan,An, Chang-Shan,Piao, Hu-Ri Shaheed Beheshti University of Medical Sciences 2015 Iranian journal of pharmaceutical research Vol.14 No.1
<P>The microbial resistance has become a global hazard with the irrational use of antibiotics. Infection of drug-resistant bacteria seriously threatens human health. Currently, there is an urgent need for the development of novel antimicrobial agents with new mechanisms and lower levels of toxicity. In this paper, a series of (<I>S</I><I>,Z</I>)-4-methyl-2-(4-oxo-5-((5-substitutedphenylfuran-2-yl) methylene)-2-thioxothiazolidin-3-yl)pentanoic acids via a Knoevenagel condensation were synthesized and evaluated for their antibacterial activity <I>in</I><I>-</I><I>vitro</I>. The synthesized compounds were characterized by IR, <SUP>1</SUP>H NMR and MS. The antibacterial test<I> in</I><I>-</I><I>vitro</I> showed that all of the synthesized compounds had good antibacterial activity against several Gram-positive bacteria (including multidrug-resistant clinical isolates) with minimum inhibitory concentration (MIC) values in the range of 2–4 µg/mL. Especially compounds 4c, 4d, 4e and 4f were the most potent, with MIC values of 2 µg/mL against four multidrug-resistant Gram-positive bacterial strains.</P>