Template Synthesis of Nitrogen-Doped Short Tubular Carbons with Big Inner Diameter and their Application in Electrochemical Sensing

Cheng, Rui,Zou, Qiong,Zhang, Xiaohua,Xiao, Chunhui,Sun, Longfei,Chen, Jinhua Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.8

Nitrogen-doped short tubular carbons (N-STCs) with big inner diameter have been successfully synthesized via carbonization of polydopamine (PDA) wrapped halloysite nanotubes (HNTs). The obtained N-STCs have average length of $0.3{\mu}m$ with big inner diameter (50 nm), thin wall (2-3 nm) and large surface area ($776m^2g^{-1}$), and show excellent electrochemical properties. As an example in electrochemical applications, N-STCs were used to electrochemically detect hydrogen peroxide ($H_2O_2$) and glucose. The results showed that the N-STCs modified glassy carbon (N-STCs/GC) electrode had much better analytical performance (lower detection limit and wider linear range) compared to the acid-treated carbon nanotubes (AO-CNTs) based GC electrode. The unique structure endows N-STCs the enhanced electrochemical performance and promising applications in electrochemical sensing.

Template Synthesis of Nitrogen-Doped Short Tubular Carbons with Big Inner Diameter and their Application in Electrochemical Sensing

Rui Cheng,Qiong Zou,Xiaohua Zhang,Chunhui Xiao,Longfei Sun,Jinhua Chen 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.8

Nitrogen-doped short tubular carbons (N-STCs) with big inner diameter have been successfully synthesized via carbonization of polydopamine (PDA) wrapped halloysite nanotubes (HNTs). The obtained N-STCs have average length of 0.3 μm with big inner diameter (50 nm), thin wall (2-3 nm) and large surface area (776 m2 g−1), and show excellent electrochemical properties. As an example in electrochemical applications, N-STCs were used to electrochemically detect hydrogen peroxide (H2O2) and glucose. The results showed that the N-STCs modified glassy carbon (N-STCs/GC) electrode had much better analytical performance (lower detection limit and wider linear range) compared to the acid-treated carbon nanotubes (AO-CNTs) based GC electrode. The unique structure endows N-STCs the enhanced electrochemical performance and promising applications in electrochemical sensing.

The Community Discovery Algorithm Based on Label Cohesion

Gui Qiong,Zhu Dejun,Cheng Xiaohui 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.9

Label Propagation Algorithm is a kind of community discovery method. This algorithm contains large numbers of random selections, which made the result uncertain and reduced the stability of the algorithm. In order to solve these problems, this paper proposed Label Cohesion Algorithm (LCA). In LCA algorithm the label propagation process is divided into two steps. The first step is taking pretreatments on the original labels. The second step is label updating. In the first step we change node label though node centripetal. In the second step the paper use label Cohesion as the judgement to choose the new label. Finally the experimental result shows that the accuracy of the algorithm has been improved.

B-cell Lymphoma 2 rs17757541 C>G Polymorphism was Associated with an Increased Risk of Gastric Cardiac Adenocarcinoma in a Chinese Population

Li, Qiong,Yin, Jun,Wang, Xu,Wang, Li-Ming,Shi, Yi-Jun,Zheng, Liang,Tang, Wei-Feng,Ding, Guo-Wen,Liu, Chao,Liu, Rui-Ping,Gu, Hai-Yong,Sun, Jia-Ming,Chen, Suo-Cheng Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.7

Aim: Apoptosis has been considered as a fundamental component in cancer pathogenesis, and related genetic factors might play an important role in gastric cardiac adenocarcinoma (GCA) genesis. Methods: We conducted a hospital based case.control study to evaluate the genetic effects of functional single nucleotide polymorphisms (SNPs): BCL2 rs17757541 C>G, BCL2 rs12454712 T>C, FAS rs2234767 G>A, FASL/FASLG rs763110 C>T, ERBB2 rs1136201 A>G and VEGFR2/KDR rs11941492 C>T on the development of GCA. A total of 243 GCA cases and 476 controls were recruited for the study and genotypes were determined using a custom-by-design 48-Plex SNPscan$^{TM}$ Kit. Results: The BCL2 rs17757541 C>G polymorphism was associated with increased risk of GCA. However, there was no significant associations with the other five SNPs. Stratified analyses indicated a significantly increased risk of GCA associated with the BCL2 rs17757541 C>G polymorphism among males, older patients and those with a history of smoking or drinking. Conclusion: These findings indicated that the functional polymorphism BCL2 rs17757541 C>G might contribute to GCA susceptibility. However, our results were limited by small sample size. Future larger studies are required to confirm our current findings.

Depth-enhanced integral imaging system based on spatial filtering

Yan Xing,Qiong-Hua Wang,Cheng-Gao Luo,Huan Deng,Da-Hai Li 한국정보디스플레이학회 2015 Journal of information display Vol.16 No.2

An integral imaging system enabling an enhanced depth of field is proposed based on spatial filtering. In the proposed system, spatial filtering is used on each elemental image to obtain a depth-enhanced elemental image in the pickup stage, and the obtained elemental images are composed to form an elemental image array for the computational reconstruction in the display stage. A preliminary experiment was carried out, and the experiment results verified the feasibility of the system.

Two new tirucallane triterpenoids from the leaves of Aquilaria sinensis

Jin Tang Cheng,Ya Qiong Han,Juan He,Xing De Wu,Liao Bin Dong,Li Yan Peng,Yan Li,Qin Shi Zhao 대한약학회 2013 Archives of Pharmacal Research Vol.36 No.9

Two new tirucallane triterpenoids, aquilacallanesA–B (1–2), together with 15 known compounds(3–17) were isolated from the leaves of Aquilaria sinensis. The structures of these new compounds were elucidated onthe basis of extensive spectroscopic analyses. All compoundswere evaluated for their cytotoxic activity againstfive human cancer cell lines. The known compounds,ursolic acid (7) and 5,7,40-trimethoxyflavone (14), exhibitedweak cytotoxic activity against some cells.

Predicting connection integrity with consideration of thermo stress

Yong Qin Cheng,Shuo Qiong Liu,Feng Zhong Qi,Hui Ting Liu 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.8

In the conventional gas seal analysis of special threaded joints, the influence of temperature stress caused by the difference between formation temperature and fluid temperature in casing is often neglected. However, the influence mechanism of temperature stress is prerequisite information for accurately predicting the safe operating conditions that prevent a premium connection from being damaged. In this paper, we propose a model that includes these effects to predict the safe operating pressures and temperatures that will prevent seal failure. For the temperature stress, we propose a finite element model of thermal solid coupling. Subsequent stress changes are evaluated by a fully coupled model of thermal solid coupling to analyze the mechanical behavior of the premium connection. We predict the safe operating envelope (SOE) for premium connection failures caused by pressure and temperature perturbations after make-up. Our model predicts that radial pressure is a key factor for connection failure, especially for rapid temperature changes. If the formation temperature is high and the casing fluid temperature is low, the influence of temperature stress will increase under this working condition, resulting in an increase in the probability of failure of premium connections. Compared with conventional premium connection models, the model of thermal solid coupling predicts a smaller SOE when heating the internal casing fluid and a larger envelope when cooling the internal casing fluid. Finally, the heating rate was considered with respect to field applications. The heating rate was also considered, and slower heating/cooling rates can prevent damage to the seal integrity. Finally, the model was applied to explain several laboratory and field experiments and achieved good matches.

Calcium-Alginate-Chitosan의 스트론튬 이온 흡착 거동

Lan Dong,Bing Deng,Lan Lan Ding,Qiong Cheng,Yong Yang,Yang Du 한국고분자학회 2014 폴리머 Vol.38 No.5

Sodium alginate and chitosan are added to a CaCl2 solution to prepare calcium-alginate-chitosan and calciumalginategels. After dehydration through stoving, two types of adsorbent particles are obtained. The adsorption processof the particles obtained for low concentrations of Sr2+ satisfies a second-order kinetic equation and the Freundlich adsorptionmodel. The thermodynamic behaviors of the particles indicate that adsorption occurs via a spontaneous physical process. XPS pattern analysis is used to demonstrate the adsorption of Sr2+ by calcium alginate and chitosan. By buildingan interaction model of the molecules of chitosan and alginate with Ca2+ and Sr2+ to calculate energy parameters, Fukuiindex, Mulliken charge, and Mulliken population, adsorption of Sr2+ on the molecular chains of chitosan as well as theboundary of calcium-alginate-chitosan is observed to show weak stability; by contrast, adsorption between molecularchains is high.

Structure and Thermal-enhanced Magnetic Properties of Mn4C Melt-spun Ribbons with Varied Stoichiometry

Ting-Ting Qi,Ping-Zhan Si,Fang Cheng,Zhi-Rui Wang,Hong-Liang Ge,Qiong Wu,Jihoon Park,Chul-Jin Choi 한국자기학회 2023 Journal of Magnetics Vol.28 No.1

Cubic perovskite-type Mn4C is difficult to prepare for its metastable characteristics. In this work, we have obtained high-purity Mn4C successfully by using melt-spinning method. The effects of stoichiometry on the structure and magnetic properties of the samples were studied systematically. We found that x = -0.1 is the optimum composition for the formation of the cubic perovskite phase in Mn4+xC during rapid quenching. Most Mn4+xC melt-spun ribbons with x other than -0.1 are composed of Mn23C6, α-Mn, and Mn4C, while the fraction of different phase in Mn4+xC ribbons varies with x. The Curie temperature of Mn4+xC ribbons increases slightly with decreasing x, which may affect the lattice parameters of cubic Mn4C and thus the Mn-Mn exchange interactions. The magnetization of Mn4+xC (x = -0.1 and 0) increases with increasing temperature in high-temperature region while the onset temperature for such behavior is dependent on the fraction of Mn4C in the samples.

Coat colour phenotype of Qingyu pig is associated with polymorphisms of melanocortin receptor 1 gene

Xiaoqian Wu,Zhendong Tan,Linyuan Shen,Qiong Yang,Xiao Cheng,Kun Liao,Lin Bai,Surong Shuai,Mingzhou Li,Xuewei Li,Shunhua Zhang,Li Zhu 아세아·태평양축산학회 2017 Animal Bioscience Vol.30 No.7

Objective: Qingyu pig, a Chinese indigenous pig breed, exhibits two types of coat colour phenotypes, including pure black and white with black spotting respectively. Melanocortin receptor 1 (MC1R) and agouti signaling protein (ASIP) are two widely reported pivotal genes that significantly affect the regulation of coat colour. The objectives of this study were to investigate whether the polymorphisms of these two genes are associated with coat colour and analyze the molecular mechanism of the coat colour separation in Qingyu pig. Methods: We studied the phenotype segregation and used polymerase chain reaction amplification and Sanger sequencing to investigate the polymorphism of MC1R and ASIP in 121 Qingyu pigs, consisting of 115 black and 6 white with black spotted pigs. Results: Coat colour of Qingyu pig is associated with the polymorphisms of MC1R but not ASIP. We only found 2 haplotypes, EQY and Eqy, based on the 13 observed mutations from MC1R gene. Among which, Eqy presented a recessive inheritance mode in black spotted Qingyu pigs. Further analysis revealed a g.462-463CC insertion that caused a frameshift mutation and a premature stop codon, thus changed the first transmembrane domain completely and lost the remaining six transmembrane domains. Altogether, our results strongly support that the variety of Qingyu pig’s coat colour is related to MC1R. Conclusion: Our findings indicated that black coat colour in Qingyu pig was dominant to white with black spotted phenotype and MC1R gene polymorphism was associated with coat colour separation in Qingyu pig.