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Ci, Cheng-Gang,Yu, Hong-Bo,Wan, Su-Qin,Liu, Jing-Yao,Sun, Chia-Chung Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.4
The hydrogen abstraction reaction of $CF_3CH_2CHO$ + OH has been studied theoretically by dual-level direct dynamics method. Two stable conformers, trans- and cis-$CF_3CH_2CHO$, have been located, and there are four distinct OH hydrogen-abstraction channels from t-$CF_3CH_2CHO$ and two channels from c-$CF_3CH_2CHO$. The required potential energy surface information for the kinetic calculation was obtained at the MCG3-MPWB//M06-2X/aug-cc-pVDZ level. The rate constants, which were calculated using improved canonical transitionstate theory with small-curvature tunneling correction (ICVT/SCT) were fitted by a four-parameter Arrhenius equation. It is shown that the reaction proceeds predominantly via the H-abstraction from the -CHO group over the temperature range 200-2000 K. The calculated rate constants were in good agreement with the experimental data between 263 and 358 K.
Ci Dunwei,Tang Zhaohui,Ding Hong,Cui Li,Zhang Guanchu,Li Shangxia,Dai Liangxiang,Qin Feifei,Zhang Zhimeng,Yang Jishun,Xu Yang 한국미생물학회 2021 The journal of microbiology Vol.59 No.1
Peanut (Arachis hypogaea. L) is an important oil seed crop. Both arbuscular mycorrhizal fungi (AMF) symbiosis and calcium (Ca2+) application can ameliorate the impact of saline soil on peanut production, and the rhizosphere bacterial communities are also closely correlated with peanut salt tolerance; however, whether AMF and Ca2+ can withstand high-salinity through or partially through modulating rhizosphere bacterial communities is unclear. Here, we used the rhizosphere bacterial DNA from saline alkali soil treated with AMF and Ca2+ alone or together to perform high-throughput sequencing of 16S rRNA genes. Taxonomic analysis revealed that AMF and Ca2+ treatment increased the abundance of Proteobacteria and Firmicutes at the phylum level. The nitrogenfixing bacterium Sphingomonas was the dominant genus in these soils at the genus level, and the soil invertase and urease activities were also increased after AMF and Ca2+ treatment, implying that AMF and Ca2+ effectively improved the living environment of plants under salt stress. Moreover, AMF combined with Ca2+ was better than AMF or Ca2+ alone at altering the bacterial structure and improving peanut growth in saline alkali soil. Together, AMF and Ca2+ applications are conducive to peanut salt adaption by regulating the bacterial community in saline alkali soil.
Experimental investigation of mechanical properties of UV-Curable 3D printing materials
Hong, Sung Yong,Kim, Ye Chan,Wang, Mei,Kim, Hyung-Ick,Byun, Do-Young,Nam, Jae-Do,Chou, Tsu-Wei,Ajayan, Pulickel M.,Ci, Lijie,Suhr, Jonghwan Elsevier 2018 Polymer Vol.145 No.-
<P><B>Abstract</B></P> <P>More recently, three dimensional printing (3D Printing), also known as an additive manufacturing (AM), has been highlighted since it shows a great promise to realize almost any three dimensional parts or structures with computer aided design (CAD). Several different processes are available for 3D printing, which includes fused deposition modeling, selective laser sintering, stereolithography, photopolymerization, and etc. In particular, considerable attention is paid to the 3D printing technique with photopolymerization due to their high resolutions. Unfortunately, the 3D printed products with photopolymerization however possess poor mechanical properties. Understanding of this should be necessary for the advantages of the 3D printing to be fully realized. Here, this study experimentally investigates the mechanical properties of the 3D printed photopolymer through thermomechanical analysis and tensile testing. In this study, it is found that the printed specimens are not fully cured after the 3D printing with photopolymerization. DiBenedetto equation is employed to better understand the relationship between the curing status and tensile properties. In addition to the poor mechanical properties, anisotropic and size dependent tensile properties of the 3D printed photopolymers are also observed. Electron beam treatment is used to ensure the cure of the 3D printed photopolymer and the corresponding tensile properties are characterized and investigated.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The interesting mechanical behaviors of 3D printed photopolymer were investigated. </LI> <LI> Anisotropic and size dependent tensile properties are studied by thermal analysis. </LI> <LI> Modeling with DiBenedetto equation was employed to understand curing degree. </LI> <LI> Electron beam treatment was chosen to ensure full cure of 3D printed photopolymer. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
( Zhang Ci ),( Choe Mun-hong ) 한국중등영어교육학회 2022 중등영어교육 Vol.15 No.2
This study investigated the effectiveness of comprehension-based processing instruction (PI) and the production-oriented approach (POA) on Chinese L1 learners’ acquisition of complex structures in L2 English. Two groups of first-year college students (n = 94) participated in an intensive skill-integrated course for two months. They were randomly assigned to either a processing instruction or a POA class. Their recognition and production of six target forms (present/past perfect, temporal adverbial clauses, indicative/subjunctive conditionals, and oblique relative clauses) were assessed in a pre-, post-, and delayed-test design. Overall, the POA group made greater progress than the PI group in both receptive and productive tasks, suggesting that POA can be a viable instructional strategy to facilitate L2 learners’ acquisition of complex grammatical features. POA was also found to be effective in fostering learners’ self-efficacy beliefs in L2 production. However, it did not induce them to apply those structures in spontaneous production contexts. PI was not as effective as POA in improving the students’ grammatical accuracy, while it nevertheless enhanced their intake of the target forms to a considerable degree.
Buckling resistance of axially loaded square concrete-filled double steel tubular columns
Junchang Ci,Mizan Ahmed,Viet-Linh Tran,Hong Jia,Shicai Chen,Tan N. Nguyen 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.43 No.6
Thin-walled square concrete-filled double steel tubular (CFDST) columns composed of the inner circular tube filled with concrete can be used to carry the large axial loads or strengthen existing CFST columns in composite constructions. This paper reports an experimental program carried out on short square CFDST columns loaded concentrically. The influences of important column parameters on the post-buckling performance of such columns are investigated. Test results exhibit that the inner circular tube significantly improves the ultimate loads and the ductility of such columns compared to conventional concrete-filled steel tubular (CFST) and double-skin CFST (DCFST) columns with an inner void. A mathematical model developed is used to simulate the ultimate strengths and load-strain curves of such columns loaded axially. Furthermore, the ultimate strengths of such columns are predicted using existing codified design models for conventional CFST columns as well as the formulas proposed by previous researchers and compared against a large database comprising 500 CFDST columns. Lastly, an accurate artificial neural network model is developed for the practical applications of such columns under axial loading.
Cheng-gang Ci,Hong-bo Yu,Su-qin Wan,Jing-yao Liu,Chia-Chung Sun 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.4
The hydrogen abstraction reaction of CF_3CH_2CHO + OH has been studied theoretically by dual-level direct dynamics method. Two stable conformers, trans- and cis-CF_3CH_2CHO, have been located, and there are four distinct OH hydrogen-abstraction channels from t-CF_3CH_2CHO and two channels from c-CF_3CH_2CHO. The required potential energy surface information for the kinetic calculation was obtained at the MCG3-MPWB//M06-2X/aug-cc-pVDZ level. The rate constants, which were calculated using improved canonical transitionstate theory with small-curvature tunneling correction (ICVT/SCT) were fitted by a four-parameter Arrhenius equation. It is shown that the reaction proceeds predominantly via the H-abstraction from the -CHO group over the temperature range 200-2000 K. The calculated rate constants were in good agreement with the experimental data between 263 and 358 K.
Tanshinone II-A Inhibits Angiogenesis through Down Regulation of COX-2 in Human Colorectal Cancer
Zhou, Li-Hong,Hu, Qiang,Sui, Hua,Ci, Shu-Jun,Wang, Yan,Liu, Xuan,Liu, Ning-Ning,Yin, Pei-Hao,Qin, Jian-Min,Li, Qi Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.9
Angiogenesis plays a significant role in colorectal cancer (CRC) and cyclooxygenase-2 (COX-2) appears to be involved with multiple aspects of CRC angiogenesis. Our aim was to investigate the inhibitory effects of Tan II-A (Tanshinone II-A, Tan II-A) on tumor growth in mice, as well as alteration of expression of COX-2 and VEGF in CRC. We established the mice xenograft model of C26 CRC cell line, and injected 0.5, 1, 2mg/kg of Tan II-A and 1mg/kg of 5-FU in respectively in vivo. Then, we assayed tumor weight and volume, and evaluated microvascular density and expression of VEGF. COX-2 promoter and COX-2 plasmids were transfected into HCT-116 cells, followed by detection of COX-2 promoter activity by chemiluminescence, and detection of COX-2 mRNA expression by fluorescence quantitative PCR. Taken together, the results showed Tan II-A could inhibit tumor growth and suppress the VEGF level in vivo. HCT-116 cell experiments showed marked inhibitory effects of Tan II-A on COX-2 and VEGF in a dose-dependent manner. The results indicate that Tan II-A can effectively inhibit tumor growth and angiogenesis of human colorectal cancer via inhibiting the expression level of COX-2 and VEGF.
Suseok Oh,Ci-Young Kim,Jongrak Hong 대한구강악안면외과학회 2014 대한구강악안면외과학회지 Vol.40 No.3
Objectives: The aim of this study was to verify the concordance of the measurement values when the same cephalometric analysis method was used for two-dimensional (2D) cephalometric radiography and three-dimensional computed tomography (3D CT), and to identify which 3D Frankfort horizontal (FH) plane was the most concordant with FH plane used for cephalometric radiography. Materials and Methods: Reference horizontal plane was FH plane. Palatal angle and occlusal plane angle was evaluated with FH plane. Gonial angle (GA), palatal angle, upper occlusal plane angle (UOPA), mandibular plane angle (MPA), U1 to occlusal plane angle, U1 to FH plane angle, SNA and SNB were obtained on 2D cephalmetries and reconstructed 3D CT. The values measured eight angles in 2D lateral cephalometry and reconstructed 3D CT were evaluated by intraclass correlation coefficiency (ICC). It also was evaluated to identify 3D FH plane with high degree of concordance to 2D one by studying which one in four FH planes shows the highest degree of concordance with 2D FH plane. Results: ICCs of MPA (0.752), UOPA (0.745), SNA (0.798) and SNB (0.869) were high. On the other hand, ICCs of gonial angle (0.583), palatal angle (0.287), U1 to occlusal plane (0.404), U1 to FH plane (0.617) were low respectively. Additionally GA and MPA acquired from 2D were bigger than those on 3D in all 20 patients included in this study. Concordance between one UOPA from 2D and four UOPAs from 3D CT were evaluated by ICC values. Results showed no significant difference among four FH planes defined on 3D CT. Conclusion: FH plane that can be set on 3D CT does not have difference in concordance from FH plane on lateral cephalometry. However, it is desirable to define FH plane on 3D CT with two orbitales and one porion considering the reproduction of orbitale itself.