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The effects of LNG-tank sloshing on the global motions of FLNG system
Zhi-Qiang Hu,Shu-Ya Wang,Gang Chen,Shu-Hong Chai,Yu-Ting Jin 대한조선학회 2017 International Journal of Naval Architecture and Oc Vol.9 No.1
This paper addresses a study of inner-tank sloshing effect on motion responses of a Floating Liquefied Natural Gas (FLNG) system, through experimental analysis and numerical modeling. To investigate hydrodynamic characteristics of FLNG under the conditions of with and without LNG-tank sloshing, a series of numerical simulations were carried out using potential flow solver SESAM. To validate the numerical simulations, model tests on the FLNG system was conducted in both liquid and solid ballast conditions with 75% tank filling level in height. Good correlations were observed between the measured and predicted results, proving the feasibility of the numerical modeling technique. On the verified numerical model, Response Amplitude Operators (RAOs) of the FLNG with 25% and 50% tank filling levels were calculated in six degrees of freedom. The influence of tank sloshing with varying tank filling levels on the RAOs has been presented and analyzed. The results showed that LNG-tank sloshing has a noticeable impact on the roll motion response of the FLNG and a moderate tank filling level is less helpful in reducing the roll motion response.
Zhi-Qiang Xiong,Mei-jin Guo,Ju Chu,Ying-ping Zhuang,Siliang Zhang 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.5
Reduced glutathione (GSH), the abundant bioactive tripeptide in most living cells, is widely used in pharmaceutical, food, and cosmetic industries. Specific growth rate (μ) is a key physiological parameter for GSH high-cell-density cultivation using microbial cell factories. Here, based on a biomass probe, an on-line μ feedback control was developed to regulate glucose feeding rate during the fed-batch phase for overproducing GSH in Saccharomyces cerevisiae. Compared with real-time μ controlled at 0.15/h, μ controlled at 0.2/h achieved yeast dry weight (120 g/L), GSH concentration (1.5 g/L), and intracellular GSH content (1.25%), which improved by 9, 150, and 129.1%, respectively. To our knowledge, this is the first report about on-line μ feedback control for GSH production. On-line μ control led to 59.38 mg/L/h of GSH productivity and 3.52 mg/g of GSH yield on glucose, which improved by 107.6 and 7.2%, respectively, in comparison with those of traditional ethanol feedback control (maintaining ethanol concentration at 1%). Taken together, the on-line μ feedback control is a promising method as an efficient alternative to conventional feed control techniques presently practiced in the GSH industry, and has the potential for the production of other valuable chemicals.
Ying-Jin Yuan,Jing-Chuan Li,Zhi-Qiang Ge 한국생물공학회 2005 Biotechnology and Bioprocess Engineering Vol.10 No.2
Ion fluxes across the plasma membrane activated by 1 mM Ce4+, cell apoptosis and taxol biosynthesis in suspension cultures of Taxus cuspidata were studied. The extracellular pH sharply decreased upon the addition of 1 mM Ce4+, then increased gradually and exceeded the initial pH value over a time period of 12 h. The extracellular Ca2+ concentration decreased within the first 3 h after the addition of Ce4+, then gradually decreased to one third of initial value in control at about 72 h and remained unchanged afterwards. Experiments with an ion channel blocker and a Ca2+-channel blocker indicated that the dynamic changes in extracellular pH and the Ca2+ concentration resulted from the Ce4+-induced activation of H+ uptake and Ca2+ influx across the plasma membrane via ion channels. A pretreatment of the ion channel blocker initiated Ce4+-treated cells to undergo necrosis, and the prior addition of the Ca2+-channel blocker inhibited Ce4+-induced taxol biosynthesis and apoptosis. It is thus inferred that H+ uptake is necessary for cells to survive a Ce4+-caused acidic environment and is one of the mechanisms of Ce4+-induced apoptosis. Furthermore, the Ca2+ influx across the plasma membrane mediated both the Ce4+-induced apoptosis and taxol biosynthesis.
Dai, Jin,Tang, Kun,Xiao, Wei,Yu, Gan,Zeng, Jin,Li, Wei,Zhang, Ya-Qun,Xu, Hua,Chen, Zhi-Qiang,Ye, Zhang-Qun Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.8
Background: C-reactive protein (CRP), considered as a prototypical inflammatory cytokine, has been proposed to be involved in tumor progression through inflammation. Recent studies have indicated CRP as a progostic predictor for urological cancers, but the results remain controversial. Materials and Methods: A systematic search of Medline, Scopus and the Cochrane Library was performed to identify eligible studies published between Jan 1, 2001 and Sep 1, 2013. Outcomes of interest were collected from studies comparing overall survival (OS), cancer-specific survival (CSS) and relapse-free survival (RFS) in patients with elevated CRP levels and those having lower levels. Studies were pooled, and combined hazard ratio (HR) of CRP with its 95% confidence interval (CI) for survival were used for the effect size estimate. Results: A total of 43 studies (7,490 patients) were included in this meta-analysis (25 for RCC, 10 for UC, and 8 for PC). Our pooled results showed that elevated serum CRP level was associated with poor OS (HR: 1.26, 95%CI: 1.22-1.30) and RFS (HR: 1.38 95%CI: 1.29-1.47), respectively. For CSS the pooled HR (HR: 1.33, 95%CI: 1.28-1.39) for higher CRP expression could strongly predict poorer survival in urological cancers. Simultaneously, elevated serum CRP was also significantly associated with poor prognosis in the subgroup analysis. Conclusions: Our pooled results demonstrate that a high serum level of CRP as an inflammation biomarker denotes a poor prognosis of patients with urological cancers. Further large prospective studies should be performed to confirm whether CRP, as a biomarker of inflammation, has a prognostic role in urological cancer progression.
The effects of LNG-tank sloshing on the global motions of FLNG system
Hu, Zhi-Qiang,Wang, Shu-Ya,Chen, Gang,Chai, Shu-Hong,Jin, Yu-Ting The Society of Naval Architects of Korea 2017 International Journal of Naval Architecture and Oc Vol.9 No.1
This paper addresses a study of inner-tank sloshing effect on motion responses of a Floating Liquefied Natural Gas (FLNG) system, through experimental analysis and numerical modeling. To investigate hydrodynamic characteristics of FLNG under the conditions of with and without LNG-tank sloshing, a series of numerical simulations were carried out using potential flow solver SESAM. To validate the numerical simulations, model tests on the FLNG system was conducted in both liquid and solid ballast conditions with 75% tank filling level in height. Good correlations were observed between the measured and predicted results, proving the feasibility of the numerical modeling technique. On the verified numerical model, Response Amplitude Operators (RAOs) of the FLNG with 25% and 50% tank filling levels were calculated in six degrees of freedom. The influence of tank sloshing with varying tank filling levels on the RAOs has been presented and analyzed. The results showed that LNG-tank sloshing has a noticeable impact on the roll motion response of the FLNG and a moderate tank filling level is less helpful in reducing the roll motion response.
Li Jing-Chuan,Ge Zhi-Qiang,Yuan Ying-Jin The Korean Society for Biotechnology and Bioengine 2005 Biotechnology and Bioprocess Engineering Vol.10 No.2
Ion fluxes across the plasma membrane activated by 1 mM $Ce^{4+}$, cell apoptosis and taxol biosynthesis in suspension cultures of Taxus cusp/data were studied. The extracellular pH sharply decreased upon the addition of 1 mM $Ce^{4+}$, then increased gradually and exceeded the initial pH value over a time period of 12 h. The extracellular $Ca^{2+}$ concentration decreased within the first 3 h after the addition of $Ce^{4+}$, then gradually decreased to one third of initial value in control at about 72 h and remained unchanged afterwards. Experiments with an ion channel blocker and a $Ca^{2+}$-channel blocker indicated that the dynamic changes in extracellular pH and the $Ca^{2+}$ concentration resulted from the $Ce^{4+}$-induced activation of W uptake and $Ca^{2+}$ influx across the plasma membrane via ion channels. A pretreatment of the ion channel blocker initiated $Ce^{4+}$-treated cells to undergo necrosis, and the prior addition of the $Ca^{2+}$-channel blocker inhibited $Ce^{4+}$-induced taxol biosynthesis and apoptosis. It is thus inferred that W uptake is necessary for cells to survive a $Ce^{4+}$-caused acidic environment and is one of the mechanisms of $Ce^{4+}$-induced apoptosis. Furthermore, the $Ca^{2+}$ influx across the plasma membrane mediated both the $Ce^{4+}$-induced apoptosis and taxol biosynthesis.
Chiral Pool Synthesis of N-Cbz-cis-(3R,4R)-3-methylamino-4-methylpiperidine from L-Malic acid
Hao, Bao-Yu,Liu, Jin-Qiang,Zhang, Wei-Han,Chen, Xin-Zhi Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.5
A new synthetic route to N-Cbz-cis-(3R,4R)-3-methylamino-4-methylpiperidine, key intermediate for CP-690,550, was disclosed with L-malic acid as the chiral pool starting material. The title compound was obtained in 16 steps with a total yield of 26% and more than 98% ee.
Chiral Pool Synthesis of N-Cbz-cis-(3R,4R)-3-methylamino-4-methylpiperidine from L-Malic acid
Bao-Yu Hao,Jin-Qiang Liu,Wei-Han Zhang,Xin-Zhi Chen 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.5
A new synthetic route to N-Cbz-cis-(3R,4R)-3-methylamino-4-methylpiperidine, key intermediate for CP- 690,550, was disclosed with L-malic acid as the chiral pool starting material. The title compound was obtained in 16 steps with a total yield of 26% and more than 98% ee.