Regeneration dynamics of potassium-based sediment sorbents for CO2 capture

Yong-fa Diao,Li-wei Wang,Lin-lin Wang,Xiao-fang Shi,Xiao-yan Tai 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.8

Simulating regeneration tests of Potassium-Based sorbents that supported by Suzhou River Channel Sediment were carried out in order to obtain parameters of regeneration reaction. Potassium-based sediment sorbents have a better morphology with the surface area of 156.73 m2·g−1, the pore volume of 357.5×10−3 cm3·g−1 and the distribution of pore diameters about 2-20 nm. As a comparison, those of hexagonal potassium-based sorbents are only 2.83 m2g−1,7.45×10−3 cm3g−1 and 1.72-5.4 nm, respectively. TGA analysis shows that the optimum final temperature of regeneration is 200 and the optimum loading is about 40%, with the best heating rate of 10 oC·min−1. By the modified Coats-Redfern integral method, the activation energy of 40% KHCO3 sorbents is 102.43 kJ·mol−1. The results obtained can be used as basic data for designing and operating CO2 capture process.

Syntheses, Crystal Structures, and Spectral Properties of Two Coordination Compounds Based on 1,2-Bis(benzimidazolyl)benzene

Fa-YanMeng,Bing-Li Jiang,Cui-Wu Lin,Li Wang,Xiao-He Tan 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.3

Two new benzimidazolyl-containing complexes have been synthesized by reactions of Cu^II salts and 1,2-bis(benzimidazolyl)benzene (H_2bbbz) with two different dicarboxylate ligands.When phthalate acid (H2pt) was employed as secondary ligand, a 0Dmolecular complex Cu(H_2bbbz)(pt)·(H_2pt) (1)was furnished and when the secondary ligand was instead by a linear bridging ligand of terephthalic acid (H_2tp) a 1D zipper-like coordination polymer [Cu(H_2bbbz)(tp)·2(C_2H_5OH)·H_2O]n (2) was obtained, suggesting the structure-direction effect of the secondary dicarbxylate ligand. The preliminary investigation on the spectral properties of the complexes was also presented.

Synthesis and Structural Studies of an Organic Complex and its Association with BSA

Fa-Yan Meng,Jin-Mei Zhu,Li Wang,Xue-Ping Zhong,Li-Xi Liang,Sheng-Rong Yu,Cui-Wu Lin 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.7

The self-assembly of one novel organic complex based on chlorogenic acid (HCA) and 2,2'-bipyridine (2,2'-bipy) has been synthesized and characterized. The complex achieved by hydrogen-bonding interactions,adopted a 1:1 stoichiometry in a solid state. The proton transfer occurred from the carboxyl oxygen to the aromatic nitrogen atom to form salts CA·(2,2'-Hbipy), the 2,2'-Hbipy molecule individually occupies the pseudo-tetragonum that is formed with CA. In this paper, the interactions of CA·(2,2'-Hbipy) with bovine serum albumin (BSA) were studied by fluorescence spectrometry. For CA·(2,2'-Hbipy), HCA and 2,2'-bipy,the average quenching constants for BSA were 2.4384 × 10^4, 4.653 × 10^3, and 3.059 × 10^3 L·mol^−1, respectively. The mechanism for protein fluorescence quenching is apparently governed by a static quenching process. The Stern-Volmer quenching constants and corresponding thermodynamic parameters ΔH, ΔG and ΔS were calculated. The binding constants and the number of binding sites were also investigated. The conformational changes of BSA were observed from synchronous fluorescence spectra.

Synthesis and Structural Studies of an Organic Complex and its Association with BSA

Meng, Fa-Yan,Yu, Sheng-Rong,Liang, Li-Xi,Zhong, Xue-Ping,Wang, Li,Zhu, Jin-Mei,Lin, Cui-Wu Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.7

The self-assembly of one novel organic complex based on chlorogenic acid (HCA) and 2,2'-bipyridine (2,2'-bipy) has been synthesized and characterized. The complex achieved by hydrogen-bonding interactions, adopted a 1:1 stoichiometry in a solid state. The proton transfer occurred from the carboxyl oxygen to the aromatic nitrogen atom to form salts CA${\cdot}$(2,2'-Hbipy), the 2,2'-Hbipy molecule individually occupies the pseudo-tetragonum that is formed with CA. In this paper, the interactions of CA${\cdot}$(2,2'-Hbipy) with bovine serum albumin (BSA) were studied by fluorescence spectrometry. For CA${\cdot}$(2,2'-Hbipy), HCA and 2,2'-bipy, the average quenching constants for BSA were $2.4384{\times}10^4$, $4.653{\times}10^3$, and $3.059{\times}10^3\;L{\cdot}mol^{-1}$, respectively. The mechanism for protein fluorescence quenching is apparently governed by a static quenching process. The Stern-Volmer quenching constants and corresponding thermodynamic parameters ${\Delta}$H, ${\Delta}$G and ${\Delta}$S were calculated. The binding constants and the number of binding sites were also investigated. The conformational changes of BSA were observed from synchronous fluorescence spectra.

Syntheses, Crystal Structures, and Spectral Properties of Two Coordination Compounds Based on 1,2-Bis(benzimidazolyl)benzene

Meng, Fa-Yan,Jiang, Bing-Li,Lin, Cui-Wu,Wang, Li,Tan, Xiao-He Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.3

Two new benzimidazolyl-containing complexes have been synthesized by reactions of $Cu^{II}$ salts and 1,2-bis(benzimidazolyl) benzene ($H_2bbbz$) with two different dicarboxylate ligands. When phthalate acid ($H_2pt$) was employed as secondary ligand, a 0D molecular complex Cu$(H_2bbbz)(pt){\cdot}(H_2pt)$ (1)was furnished and when the secondary ligand was instead by a linear bridging ligand of terephthalic acid ($H_2tp$) a 1D zipper-like coordination polymer $[Cu(H_2bbbz)(tp){\cdot}2(C_2H_5OH){\cdot}H_2O]_n$ (2) was obtained, suggesting the structure-direction effect of the secondary dicarbxylate ligand. The preliminary investigation on the spectral properties of the complexes was also presented.

Accuracy and reproducibility of 3D digital tooth preparations made by gypsum materials of various colors

Tan, Fa-Bing,Wang, Chao,Dai, Hong-Wei,Fan, Yu-Bo,Song, Jin-Lin The Korean Academy of Prosthodonitics 2018 The Journal of Advanced Prosthodontics Vol.10 No.1

PURPOSE. The study aimed to identify the accuracy and reproducibility of preparations made by gypsum materials of various colors using quantitative and semi-quantitative three-dimensional (3D) approach. MATERIALS AND METHODS. A titanium maxillary first molar preparation was created as reference dataset (REF). Silicone impressions were duplicated from REF and randomized into 6 groups (n=8). Gypsum preparations were formed and grouped according to the color of gypsum materials, and light-scanned to obtain prepared datasets (PRE). Then, in terms of accuracy, PRE were superimposed on REF using the best-fit-algorithm and PRE underwent intragroup pairwise best-fit alignment for assessing reproducibility. Root mean square deviation (RMSD) and degrees of similarity (DS) were computed and analyzed with SPSS 20.0 statistical software (${\alpha}=.05$). RESULTS. In terms of accuracy, PREs in 3D directions were increased in the 6 color groups (from 19.38 to $20.88{\mu}m$), of which the marginal and internal variations ranged $51.36-58.26{\mu}m$ and $18.33-20.04{\mu}m$, respectively. On the other hand, RMSD value and DS-scores did not show significant differences among groups. Regarding reproducibility, both RMSD and DS-scores showed statistically significant differences among groups, while RMSD values of the 6 color groups were less than $5{\mu}m$, of which blue color group was the smallest ($3.27{\pm}0.24{\mu}m$) and white color group was the largest ($4.24{\pm}0.36{\mu}m$). These results were consistent with the DS data. CONCLUSION. The 3D volume of the PREs was predisposed towards an increase during digitalization, which was unaffected by gypsum color. Furthermore, the reproducibility of digitalizing scanning differed negligibly among different gypsum colors, especially in comparison to clinically observed discrepancies.

Composite action of concrete-filled double circular steel tubular stub columns

Liping Wang,Xing-xing Cao,Fa-Xing Ding,Liang Luo,Yi Sun,Xue-mei Liu,Hui-lin Su 국제구조공학회 2018 Steel and Composite Structures, An International J Vol.29 No.1

This paper presents a combined numerical, experimental, and theoretical study on the behavior of the concrete-filled double circular steel tubular (CFDT) stub columns under axial compressive loading. Four groups of stub column specimens were tested in this study to find out the effects of the concrete strength, steel ratio and diameter ratio on the mechanical behavior of CFDT stub columns. Nonlinear finite element (FE) models were also established to study the stresses of different components in the CFDT stub columns. The change of axial and transverse stresses in the internal and external steel tubes, as well as the change of axial stress in the concrete sandwich and concrete core, respectively, was thoroughly investigated for different CFDT stub columns with the same steel ratio. The influence of inner-to-outer diameter ratio and steel ratio on the ultimate bearing capacity of CFDT stub columns was identified, and a reasonable section configuration with proper inner-to-outer diameter ratio and steel ratio was proposed. Furthermore, a practical formula for predicting the ultimate bearing capacity was proposed based on the ultimate equilibrium principle. The predicted results showed satisfactory agreement with both experimental and numerical results, indicating that the proposed formula is applicable for design purposes.

Prognostic Significance of Preoperative Serum Alpha-fetoprotein in Hepatocellular Carcinoma and Correlation with Clinicopathological Factors: a Single-center Experience from China

An, Song-Lin,Xiao, Ting,Wang, Li-Ming,Rong, Wei-Qi,Wu, Fan,Feng, Li,Liu, Fa-Qiang,Tian, Fei,Wu, Jian-Xiong Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.10

Objectives: To investigate the prognosis significance of preoperative serum alpha-fetoprotein (AFP) and the correlation with clinicopathological factors of hepatocellular carcinoma (HCC) patients who underwent hepatectomy. Materials and Methods: Clinicopathological data of retrospective analysis were collected for 251 HCC patients undergoing hepatectomy in this study. According to preoperative AFP level, patients were categorized into AFP-negative (0-20ng/mL) and AFP-positive (>20 ng/mL) groups for Kaplan-Meier analysis and Cox proportional hazard regression modeling. Results: The results demonstrated that increased AFP was associated with longer prothrombin time (PTs), liver capsule invasion, low grade differentiation, and late Barcelona Clinic Liver Center (BCLC) stage. Moreover, the female patients had a greater prevalence of increased preoperative AFP than male patients [284.8 (3.975-3167.5) vs (3.653-140.65); Z-2.895, p=0.004]. The 1-, 3-, and 5-year recurrence-free survival (RFS) rates were 78.1, 57.5, and 40.6 % in the AFP-negative group and 61.8, 37.7, and 31.4 %, respectively, in the AFP-positive group (log-rank test 8.312, p=0.004). The 1-, 3-, and 5-year overall survival (OS) rates were 94.4, 83.8, and 62.3% in the AFP-negative group and 87.2, 60.0, and 36.7%, respectively, in the AFP-positive group. The difference was statistically significant (log-rank test, 16.884, p=0.000). Cox proportional-hazards model identified preoperative AFP to be an independent prognostic predictor of overall survival. Conclusions: Preoperative serum AFP is an independent predictor of prognosis among HCC patients following surgical resection. Female patients have a higher preoperative AFP than their male counterparts.

Experimental investigation of viscoelastic polymers for stabilizing foam

Wan-Fen Pu,PENGWEI,Lin Sun,Fa-yang Jin,Song Wang 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.47 No.-

Foam stability can be significantly improved by adding a polymer in foam system, mainly due to thereduction of liquid drainage and the enhancement of interfacial adsorption behavior. In this paper, wecombined rheological properties with surface properties to investigate the effect of different polymers onthe stability of polymer enhanced foam, and then analyzed the foam stability from microscopicviewpoint. From the results, the liquid drainage of polymer enhanced foam was highly depending on thesolution viscosity with a high shear-rate (200 s 1) instead of the initial thickening ability of polymer, andthe stability of liquidfilms was improved by increasing solution elasticity or interfacial viscoelasticity orby reducing surface tension. Finally, the micro-experiment revealed that the XG (xanthan gum) enhancedfoam possessed the dense and uniform gas bubbles and the thick and multi-layered liquidfilms, whichcontributes to the reduction of coalescence and the increase offilm strength.

Keratanase II Digestion Accompanied with a Liquid Chromatography/Tandem Mass Spectrometry for Urinary Keratan Sulfate Quantitative Analysis

Chuang, Chih-Kuang,Lin, Hsiang-Yu,Wang, Tuen-Jen,Huang, Sung-Fa,Lin, Shuan-Pei Association for Research of MPS and Rare Diseases 2017 Journal of mucopolysaccharidosis and rare disease Vol.3 No.1

Purpose: Mucopolysaccharidosis IV (MPS IV) is a disease characterized by deficient activity of N-acetylgalactosamine-6-sulfatase (GALNS) causing excessive lysosomal storage of keratan sulfate (KS). The identification of the relevant disaccharide units of KS after keratanase II digestion followed by liquid chromatography/tandem mass spectrometry detection (LC-MS/MS) is validated and applicable for the preliminary diagnosis of MPS IV. Methods: A total of 67 urine samples were collected and analyzed from 11 MPS IV patients comprising 10 MPS IVA and one MPS IVB patients, and 56 normal controls. Urinary glycosaminoglycan was first precipitated by the Alcian blue method followed by a digestion of keratanase II. The protonated species of the digested disaccharide products were detected by using multiple reaction monitoring experiment. Results: One particular disaccharide of KS was selected. The transition mass-to-charge (m/z) of the parent ion and its daughter ion after collision was $462.0{\rightarrow}97.0$, whereas the chondrosine used as an internal standard in this assay was m/z $353.9{\rightarrow}73.0$. The results corresponded well with the two-dimensional electrophoresis method. The quantities of urinary KS were significantly raised in confirmed MPS IV patients when comparing with those of normal controls ($170.2{\pm}81.1$ vs. $4.06{\pm}1.92{\mu}g/mL$). Conclusion: The LC-MS/MS method for MPS IVA determination is specific, sensitive, validated, and applicable for urinary KS quantification. This method can be used not only as a first-line biochemistry examination of MPS IVA, but also as an outcome survey after enzyme replacement therapy.